• 专利附录
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    • 专利摘要:
    electrically heated aerosol generation system with improved heater control. the present invention relates to a method for controlling at least one electrical heating element of an electrically heated aerosol generating system for heating an aerosol-forming substrate. the electrically heated aerosol generation system has a sensor to detect air flow indicative of a user giving a breath having a duration of the air flow. the method comprises the steps of: increasing the heating energy to at least one heating element from zero to energy p1 when the sensor detects that the air flow rate has increased to a first limit, maintaining the heating energy to an anergy p1 for at least some duration of the air flow, and decreasing the heating energy for the at least one heating element of the energy p1 to zero when the sensor detects that the air flow rate decreases to a second limit.
    公开号:BR112013013298B1
    申请号:R112013013298-1
    申请日:2011-12-02
    公开日:2021-02-23
    发明作者:Michel THORENS；Jean-Marc Flick；Olivier Yves Cochand；Flavien Dubief
    申请人:Philip Morris Products S.A.；
    IPC主号:
    专利说明:

    [0001] The present invention relates to a method for controlling at least one electrical heating element of an electrically heated aerosol generating system. The present invention relates additionally to an electrically heated aerosol generation system. The present invention finds particular application as a method for controlling at least one electrical heating element of an electrically heated smoking system, and as an electrically heated smoking system.
    [0002] WO-A-2009/132793 discloses an electrically heated steaming system. A liquid is stored in a liquid storage portion, and a capillary wick has a first end that extends into the liquid storage portion for contact with the liquid therein, and a second end that extends out of the liquid storage portion. liquid. A heating element heats the second end of the capillary wick. The heating element is in the form of an electrical heating element spiraled in electrical connection to a power supply, and surrounding the second end of the capillary wick. In use, the heating element can be activated by the user to turn on the power supply. The suction in a nozzle by the user causes the air to be sucked into the electrically heated steaming system over the capillary wick and heating element and subsequently into the user's mouth.
    [0003] It is an object of the invention to provide an improved method of controlling the electrical heating element of such an electrically heated aerosol generating system.
    [0004] According to a first aspect of the invention, a method is provided for controlling at least one electrical heating element of an electrically heated aerosol generating system, for heating an aerosol forming substrate, the system having a sensor to detect air flow indicative of a user giving a breath having a duration of the air flow, the method comprising the steps of: increasing the heating energy for at least one heating element from zero to an energy p1 when the sensor detects that the air flow rate has increased to a first limit; maintaining the heating energy at energy p1 for at least some of the duration of the air flow; and decreasing the heating energy for at least one energy heating element p1 to zero when the sensor detects that the air flow rate has decreased to a second limit.
    [0005] The at least one electrical heating element is arranged to heat the aerosol-forming substrate to form the aerosol. The electrically heated aerosol generating system may include the aerosol-forming substrate, or may be adapted to receive the aerosol-forming substrate. As known to those skilled in the art, an aerosol is a suspension of solid particles or liquid droplets in a gas, such as air. By controlling the heating energy supplied to at least one heating element, energy use can be optimized. The heating energy can be provided to the particular blowing profile so that the desired aerosol properties, for example, aerosol concentration or particle size, can be achieved. Overheating or underheating can be avoided, particularly towards the beginning or end of the breath. The decrease in energy towards the end of the blow affects the cooling of the heating element and, consequently, the temperature of the heating element and its vicinity. This, in turn, affects how much more condensation is able to form in the system, which can affect the leakage of liquid.
    [0006] Preferably, the electrically heated aerosol generation system comprises an energy supply for supplying energy to at least one electrical heating element. Preferably, the electrically heated aerosol generation system comprises an electrical circuit for controlling the energy supply from the energy supply to at least one electrical heating element. Preferably, the electrical circuit comprises the sensor.
    [0007] Preferably, the electrical circuit is arranged to carry out the steps of the method of the first aspect of the invention. The electrical circuit can be connected by hardware to carry out the method steps of the first aspect of the invention. Most preferably, however, the electrical circuit is programmable to carry out the method steps of the first aspect of the invention.
    [0008] The sensor can be any sensor that can detect air flow indicative of a user giving a breath. The sensor can be an electromechanical device. Alternatively, the sensor can be any of: a mechanical device, an optical device, an opto-mechanical device, a sensor based on micro-mechanical mechanical systems (MEMS), and an acoustic sensor.
    [0009] Typically, the rate of air flow (which can also be known as the rate of blow flow), during the duration of the air flow (which can be the same depending on the duration of the blow), increases from zero to the first limit to a maximum, and then decreases from the maximum to the second limit, and then to zero. The air flow rate can form a Gaussian or normal distribution (also known as a bell-shaped curve). More usually, however, the rate of air flow can form a non-perfect Gaussian distribution. The duration of the airflow can be defined in a number of modes. For example, the duration of the air flow can be defined as the period of time during which the air flow rate is non-zero. Alternatively, the duration of the air flow can be defined as the period of time during which the air flow rate is greater than a predefined level. Preferably, the energy p1 is predefined. The p1 energy can depend on a number of factors including, but not limited to, the shape of the electric heating element, the type of aerosol that forms the substrate, the amount of aerosol desired to be formed, and the particle size required for the aerosol.
    [00010] In one embodiment, the first airflow rate limit is equal to the second airflow rate limit. This embodiment is advantageous, because the operation of the method is relatively simple.
    [00011] In another embodiment, the first airflow rate limit is less than the second airflow rate limit. This embodiment is advantageous because it can contribute to avoid overheating towards the end of the blow which, in turn, affects the formation of condensation. Because the second limit of the air flow rate, in which the heating energy is decreased, is higher than the first limit of the air flow rate, in which the heating energy is increased, the heating energy supplied to the hair least one heating element is decreased earlier in the blow. This prevents overheating towards the end of the airflow duration.
    [00012] A step of increasing the heating energy for at least one heating element from zero to energy p1 may comprise increasing a heating energy from zero to energy p1 substantially instantly. That is, the energy can be increased from zero to energy p1 over a period of time that is substantially equal to zero. In a graph of heating energy on the vertical axis versus time on the horizontal axis, this would be represented by a vertical line, or substantially vertical, from zero energy to energy p1.
    [00013] Alternatively, a step of increasing a heating energy for at least one heating element of zero energy to energy p1 may comprise increasing a heating energy of zero to energy p1 over a period of time not equal to zero. That is, the energy can be increased from zero energy to energy p1 gradually over a selected period of time. The longer the selected period of time, the more gradual the energy increases. In a graph of heating energy on the vertical axis versus time on the horizontal axis, this would be represented by a slope with a positive gradient from zero energy to energy p1. The gradient of the slope can be constant or not constant.
    [00014] A step of decreasing the heating energy for the at least one heating element of the energy p1 to zero energy may comprise decreasing the heating energy of energy p1 to zero substantially instantly. That is, the energy can be decreased from energy p1 to zero over a period of time that is substantially equal to zero. In a graph of heating energy on the vertical axis versus time on the horizontal axis, this would be represented by a vertical, or substantially vertical, line of energy p1 at zero energy.
    [00015] Alternatively, the step of decreasing the heating energy for at least one heating element of energy p1 to zero may comprise decreasing the heating energy of energy p1 to zero gradually. That is, the energy can be decreased for a period of time not equal to zero. That is, the energy can be gradually decreased from the energy p1 to zero over a selected period of time. The longer the selected period of time, the more gradual the energy decreases. In a graph of heating energy on the vertical axis versus time on the horizontal axis, this would be represented by a slope with a negative energy gradient p1 at zero energy. The gradient of the slope can be constant or not constant.
    [00016] In one embodiment, the method further comprises, after the step of increasing the heating energy for at least one heating element from zero to energy p1, the step of: increasing the heating energy for at least one element heating energy p1 to energy p2, greater than energy p1.
    [00017] That is, at the beginning of the duration of the air flow, the heating energy is p2, greater than p1. This provides an accumulation of electrical energy at the beginning of the breath. Preferably, after the initial accumulation of electrical energy, having a maximum energy p2, the energy decreases the energy p1 and, for the remainder of the duration of the air flow, the heating energy is maintained in the energy p1. Such overheating towards the beginning of the airflow duration results in aerosol generation starting earlier. This can provide better reactivity for the user. This can also decrease the particle size of the aerosol, or concentration of aerosol at the beginning of the blow. Preferably, the energy p2 is predefined. The p2 energy can depend on a number of factors including, but not limited to, the shape of the electric heating element, the type of aerosol that forms the substrate, the amount of aerosol desired to be formed, and the particle size required for the aerosol.
    [00018] A step of maintaining the heating energy at a p1 energy for at least some of the duration of the air flow may comprise supplying pulses of electrical current to at least one heating element at a first frequency f1 and a first cycle of service. The first frequency f 1, the first duty cycle, or both the first frequency f1 and the first duty cycle, can be selected appropriately in order to maintain the heating energy at the desired level. Current pulses can have any suitable maximum current.
    [00019] A step of decreasing the heating energy of the energy p1 to zero can gradually comprise supply of pulses of electric current to at least one heating element at a second frequency f2 and a second duty cycle. The second frequency f2, the second duty cycle, or both the second frequency f2 and the second duty cycle, can be selected appropriately in order to decrease the heating energy appropriately. The second frequency f2 can be lower than the first frequency f1. Alternatively, the first frequency f1 and the second frequency f2 can be the same. The second duty cycle may be lower than the first duty cycle. Alternatively, the first duty cycle and the second duty cycle can be the same.
    [00020] A step of increasing the heating energy for at least one heating element from energy p1 to energy p2, greater than energy p1 may comprise supplying pulses of electrical current to at least one heating element at a third frequency f3 and a third service cycle. The third frequency f3, the third duty cycle, or both the third frequency f3 and the third duty cycle, can be selected appropriately in order to increase the heating energy to energy p2. The third frequency f3 can be higher than both the first frequency f1 and the second frequency f2. The third frequency can be equal to one or both of the first frequency f1, and the second frequency f2. The third duty cycle may be lower than the second duty cycle. The third duty cycle can be the same as one or both of the first duty cycle and the second duty cycle.
    [00021] According to a second aspect of the invention, an electrically heated aerosol generation system is provided for heating an aerosol-forming substrate, the system comprising: at least one electric heating element for heating the aerosol-forming substrate aerosol to form the aerosol; a power supply for supplying power to at least one electric heating element; and electrical circuit for control of energy supply from the energy supply to at least one electrical heating element, the electrical circuit including a sensor to detect air flow indicative of a user giving a breath having a duration of the air flow; in which the electrical circuit is arranged to increase the heating energy for the at least one heating element from zero to an energy p1 when the sensor detects that the air flow rate has increased to a first limit; maintaining the heating energy at energy p1 for at least some of the duration of the air flow; and decreasing the heating energy to at least one heating element of the energy p1 to zero when the sensor detects that the air flow rate has decreased to a second limit.
    [00022] In one embodiment, the aerosol forming substrate is a liquid substrate, and the electrically heated aerosol generating system further comprises the capillary wick for transporting the liquid substrate to at least one electrical heating element. As will be discussed further below, the heating element, in combination with the capillary wick, can provide a quick response and therefore improved control of the heating profile.
    [00023] According to a third aspect of the invention, an electrical circuit is provided for an electrically heated aerosol generation system, the electrical circuit being arranged to carry out the method of the first aspect of the invention.
    [00024] Preferably, the electrical circuit is programmable to carry out the method of the first aspect of the invention. Alternatively, the electrical circuit can be connected by hardware to carry out the method of the first aspect of the invention.
    [00025] According to a fourth aspect of the invention, a computer program is provided which, when operated on the programmable electrical circuit for an electrically heated aerosol generation system, causes the programmable electrical circuit to perform the method of the first aspect of the invention.
    [00026] According to a fifth aspect of the invention, a computer-readable storage medium is provided and a computer program according to the fourth aspect of the invention is stored therein.
    [00027] The at least one electric heating element may comprise a single heating element. Alternatively, the at least one electric heating element can comprise more than one heating element, for example, two, or three, or four, or five, or six, or more heating elements. The heating element or heating elements can be arranged appropriately so as to more effectively heat the aerosol forming substrate.
    [00028] The at least one electrical heating element preferably comprises an electrically resistive material. Suitable electrically resistive materials include, but are not limited to: semiconductors, such as doped ceramics, electrically "conductive" ceramics (such as, for example, molybdenum disilicate), carbon, graphite, metals, metal alloys and composite materials produced from a ceramic material and a metallic material. Such composite materials may comprise doped or non-doped ceramics. Examples of suitable doped ceramics include doped silicon carbides. Examples of suitable metals include titanium, zirconium, tantalum, and metals from the platinum group. Examples of suitable metal alloys include stainless steel, Constantan, alloys containing nickel, cobalt, chromium, aluminum-titanium, zirconium, hafnium, niobium, molybdenum, tantalum, tungsten, tin, gallium, manganese and iron, and nickel-based super alloys , iron, cobalt, stainless steel, Timetal®, ferro-aluminum alloys, and ferro-manganese-aluminum alloys. Timetal® is a registered trademark of Titanium Metals Corporation, 1999 Broadway Suite 4300, Denver Colorado. In composite materials, the electrically resistive material can optionally be embedded in, encapsulated or coated with, an insulating material, or vice versa, depending on the energy transfer kinetics and the required external physical-chemical properties. The heating element may comprise an etched metallic sheet insulated between two layers of an inert material. In this case, the inert material can comprise Kapton®, all polyimide, or sheet of mica. Kapton® is a registered trademark of E.l. du Pont de Nemours and Company, 1007 Market Street, Wilmington, Delaware 19898, United States of America.
    [00029] Alternatively, the at least one electric heating element can comprise an infrared heating element, a photonic source, or an inductive heating element.
    [00030] The at least one electric heating element can take any suitable shape. For example, the at least one electric heating element can take the form of a heating blade. Alternatively, the at least one electrical heating element can take the form of an enclosure or substrate having different electroconductive portions, or an electrically resistive metal tube. If the aerosol-forming substrate is a liquid provided inside a container, the container can incorporate an available heating element. Alternatively, one or more heating needles or rods, which operate through the center of the aerosol-forming substrate, may also be suitable. Alternatively, the at least one electric heating element can be a disc heater (terminal), or a combination of a disc heater with heating needles or rods. Alternatively, the at least one electrical heating element may comprise a flexible sheet of material arranged to surround, or partially surround, the aerosol-forming substrate. Other alternatives include a filament or heating wire, for example, a Ni-Cr, platinum, tungsten, or alloy wire, or a heating plate. Optionally, the heating element can be deposited inside or on a rigid carrier material.
    [00031] The at least one electric heating element can comprise a heat deposit, or heat reservoir comprising a material capable of absorbing and storing heat and subsequently releasing heat over time to the aerosol forming substrate. The heat deposit can be formed of any suitable material, such as a suitable metal or ceramic material. Preferably, the material has a high heat capacity (heat sensitive storage material), or is a material capable of absorbing and subsequently releasing heat, via a reversible process, such as a high temperature phase change. Suitable heat sensitive storage materials include silica gel, alumina, carbon, glass mat, fiberglass, minerals, a metal or alloy, such as aluminum, silver or lead, and a cellulose material, such as paper. Other suitable materials that release heat, via a reversible phase change, include paraffin, sodium acetate, naphthalene, wax, polyethylene oxide, a metal, metal salt, a mixture of eutectic salts, or an alloy.
    [00032] The heat tank or heat reservoir can be arranged such that it is directly in contact with the aerosol-forming substrate, and can transfer the stored heat directly to the substrate. Alternatively, the heat stored in the heat tank, or the heat reservoir, can be transferred to the aerosol-forming substrate by means of a heat conductor, such as a metal tube.
    [00033] The at least one heating element can heat the aerosol-forming substrate by means of conduction. The heating element can be at least partially in contact with the substrate, or the carrier on which the substrate is deposited. Alternatively, heat from the heating element can be conducted to the substrate by means of a conductive heat element.
    [00034] Alternatively, the at least one heating element can transfer heat to the incoming ambient air that is aspirated through the electrically heated aerosol generation system during use, which in turn heats the aerosol-forming substrate by convection. Ambient air can be heated before passing through the aerosol-forming substrate. Alternatively, if the aerosol-forming substrate is a liquid substrate, ambient air can first be sucked through the substrate and then heated.
    [00035] The aerosol forming substrate can be a solid aerosol forming substrate. The aerosol forming substrate preferably comprises volatile tobacco flavoring compounds containing tobacco containing material which are released from the substrate after heating. The aerosol-forming substrate may comprise non-tobacco material. The aerosol-forming substrate may comprise tobacco-containing and non-tobacco-containing material. Preferably, the aerosol forming substrate further comprises an aerosol former. Examples of suitable aerosol builders are glycerin and propylene glycol.
    [00036] Alternatively, the aerosol-forming substrate may be a liquid aerosol-forming substrate. In one embodiment, the electrically heated aerosol generation system further comprises a liquid storage portion. Preferably, the liquid aerosol-forming substrate is stored in the liquid storage portion. In one embodiment, the electrically heated aerosol generating system further comprises a capillary wick in communication with the liquid storage portion. It is also possible for a capillary wick to retain liquid to be provided without a liquid storage portion. In this embodiment, the capillary wick can be preloaded with liquid.
    [00037] Preferably, the capillary wick is arranged to be in contact with liquid in the liquid storage portion. In this case, in use, liquid is transferred from the liquid storage portion towards at least one electrical heating element by capillary action on the capillary wick. In one embodiment, the capillary wick has a first end and a second end, the first end extending in the liquid storage portion for contact with liquid therefrom and the at least one electric heating element being arranged to heat liquid at the second end . When the heating element is activated, the liquid at the second end of the capillary wick is vaporized by the heater to form supersaturated steam. Supersaturated steam is mixed with and transported in the air stream. During the flow, the vapor condenses to form the aerosol, and the aerosol is transported towards a user's mouth. The heating element, in combination with the capillary wick, can provide a quick response, because that arrangement can provide a high surface area of liquid to the heating element. The control of the heating element, according to the invention, can therefore depend on the structure of the capillary wick arrangement.
    [00038] The liquid substrate can be absorbed into a porous carrier material, which can be produced from any suitable shutter or absorbent body, for example, a foamed metal or plastic material, polypropylene, terylene, nylon fibers, or ceramic. The liquid substrate can be retained in the porous carrier material before using the electrically heated aerosol generating system, or alternatively, the liquid substrate material can be released into the porous carrier material during, or immediately before, use. For example, the liquid substrate can be provided in a capsule. The capsule shell preferably melts after heating, and releases the liquid substrate into the porous carrier material. The capsule can optionally contain a solid in combination with the liquid.
    [00039] If the aerosol forming substrate is a liquid substrate, the liquid has physical properties, for example, a boiling point suitable for use in the aerosol generation system: if the boiling point is too high, at least an electric heating element will not be able to vaporize liquid in the capillary wick, but if the boiling point is too low, the liquid can vaporize even without at least one electric heating element being activated. The control of at least one electrical heating element may depend on the physical properties of the liquid substrate. The liquid preferably comprises a tobacco-containing material comprising volatile tobacco flavor compounds which are released from the liquid under heating. Alternatively, or in addition, the liquid may comprise tobacco-free material. The liquid can include water, solvents, ethanol, plant extracts, and natural or artificial flavorings. Preferably, the liquid further comprises an aerosol former. Examples of suitable aerosol builders are glycerin and propylene glycol.
    [00040] An advantage of providing a liquid storage portion is that a high level of hygiene can be maintained. Using the capillary wick extending between the liquid and the electric heating element, the structure of the system is allowed to be relatively simple. The liquid has physical properties, including viscosity and surface tension, which allow the liquid to be transported through the capillary wick by capillary action. The liquid storage portion is preferably a container. The liquid storage portion cannot be refilled. Thus, when the liquid in the liquid storage portion has been used, the aerosol generation system is replaced. Alternatively, the liquid storage portion can be refilled. In this case, the aerosol generation system can be replaced after a number of refills from the liquid storage portion. Preferably, the liquid storage portion is arranged to retain liquid for a predetermined number of blows.
    [00041] The capillary wick can have a fibrous or spongy structure. The capillary wick preferably comprises a bundle of capillaries. For example, the capillary wick may comprise a plurality of fibers or yarns, or other fine-bore tubes. The fibers or threads can generally be aligned in the longitudinal direction of the aerosol generation system. Alternatively, the capillary wick may comprise sponge-like material or foam-like material formed into a rod shape. The rod shape can extend along the longitudinal direction of the aerosol generation system. The wick structure forms a plurality of small holes or tubes, through which the liquid can be transported to the electric heating element by capillary action. The capillary wick can comprise any suitable material, or combination of materials. Examples of suitable materials are graphite-based or ceramic-based materials in the form of sintered fibers or powders. The capillary wick can have any capillary and porosity suitable for use with different physical liquid properties, such as density, viscosity, surface tension and vapor pressure. The properties of the capillary of the wick, combined with the properties of the liquid, ensure that the wick is always moist in the heating area. If the wick is dry, overheating can occur, which can lead to thermal degradation of the liquid.
    [00042] The aerosol forming substrate may alternatively be any other type of substrate, for example, a gas substrate, or any combination of the various types of substrate. During operation, the substrate may be completely, however, within the electrically heated aerosol generation system. In this case, a user can blow into a nozzle of the electrically heated aerosol generation system. Alternatively, during operation, the substrate may be partially contained within the electrically heated aerosol generation system. In this case, the substrate can form part of a separate article, and the user can blow directly on the separate articles.
    [00043] Preferably, the electrically heated aerosol generation system is an electrically heated steaming system.
    [00044] The electrically heated aerosol generation system may comprise an aerosol-forming chamber in which aerosol is formed from a super-saturated vapor, which the aerosol is then transported in the user's mouth. An air intake, air discharge and the chamber, are preferably arranged so as to define an air flow path from the air intake to the air discharge, via the aerosol forming chamber, in order to transport the aerosol for air discharge, and inside a user's mouth. Condensation may form on the walls of the aerosol forming chamber. The amount of condensation may depend on the heating profile, particularly towards the end of the blow.
    [00045] Preferably, the aerosol generating system comprises a housing. Preferably, the housing is elongated. The structure of the housing, including the surface area available for condensation for form, will affect the properties of the aerosol, and whether there is a leakage of liquid from the system. The housing may comprise a housing and a nozzle. In this case, all components can be contained in either the housing or the nozzle. The housing can comprise any suitable material, or combination of materials. Examples of materials include metals, alloys, plastics, or composite materials containing one or more of these materials, or thermoplastics that are suitable for food or pharmaceutical applications, for example, polypropylene, polyetheretherketone (PEEK) and polyethylene. Preferably, the material is light and not brittle. The housing material can affect the amount of condensation that forms in the housing, which in turn will affect leakage of liquid from the system.
    [00046] Preferably, the aerosol generation system is portable. The aerosol generation system can be a smoking system, and can be comparable in size to a conventional cigar or cigarette. The steaming system can have a total length between approximately 30 mm and approximately 150 mm. The steaming system can have an outside diameter between approximately 5 mm and approximately 30 mm.
    [00047] The features described in relation to one aspect of the invention may be applicable to another aspect of the invention.
    [00048] The electrically heated aerosol generation method and system according to the present invention provides a number of advantages. The heating profile can be provided to the blowing profile, thereby providing an improved user experience. The heating profile can also produce desired aerosol properties, for example, aerosol concentration or aerosol particle size. The heating profile can also affect the formation of aerosol condensate which, in turn, can affect leakage of liquid from the system. The use of energy can be optimized, in order to provide a good heating profile, without losing unnecessary energy.
    [00049] The invention will be further described, by way of example only, with reference to the accompanying drawings, in which: Figure 1 shows an example of an electrically heated aerosol generation system; Figure 2 shows a first embodiment of a method for controlling heating energy to a heating element of an electrically heated aerosol generating system; Figure 3 shows a second embodiment of a method for controlling heating energy to a heating element of an electrically heated aerosol generating system; Figure 4 shows a third embodiment of a method for controlling heating energy to a heating element of an electrically heated aerosol generating system; Figure 5 shows a fourth embodiment of a method for controlling heating energy to a heating element of an electrically heated aerosol generating system; Figure 6 shows a fifth embodiment of a method for controlling heating energy to a heating element of an electrically heated aerosol generating system; and Figures 7 and 8 show how the heating energy to a heating element of an electrically heated aerosol generating system can be controlled via a pulsed current signal.
    [00050] Figure 1 shows an example of an electrically heated aerosol generation system. In Figure 1, the system is a smoking system having a liquid storage portion. The steaming system 100 of Figure 1 comprises a housing 101 having a first end which is the end of the nozzle 103 and a second end which is the end of the body 105. At the end of the body, a supply of electrical energy is provided in the form of a battery 107 and electrical circuit in the form of hardware 109 and a blowing detection system 111. At the end of the nozzle, a liquid storage portion in the form of a cartridge 113 containing liquid 115, the capillary wick 117 and a heater 119 comprising at least one heating element. Note that the heater is only shown schematically in Figure 1. One end of capillary wick 117 extends in cartridge 113 and the other end of capillary 117 is surrounded by heater 119. The heater is connected to the electrical circuit, via connections 121 Housing 101 also includes an air intake 123, an air discharge 125 at the end of the nozzle, and an aerosol forming chamber 127.
    [00051] In use, the operation is as follows. The liquid 115 is transferred or transported by capillary action from the cartridge 113 from the end of the wick 117 which extends in the cartridge to the other end of the wick 117 which is surrounded by the heater 119. When a user aspirates into the device in the discharge of air 125, ambient air is sucked through the air inlet 123. In the arrangement shown in Figure 1, the blowing detection system 111 detects the blowing and activates heater 119. Battery 107 supplies energy to heater 119 to heat the end of the wick 117 surrounded by the heater. The liquid at this end of the wick 117 is vaporized by the heater 119 to create supersaturated steam. At the same time, the liquid being vaporized is replaced by the additional liquid that moves along the wick 117 by capillary action. (This is sometimes referred to as "pumping action"). The supersaturated steam created is mixed with and transported in the air flow from the air intake 123. In the aerosol forming chamber 127, the vapor condenses to form an inhalable aerosol, which is conducted towards the discharge 125, and inside from the user’s mouth.
    [00052] The capillary wick can be produced from a variety of porous or capillary materials and preferably has a known predefined capillarity. Examples include ceramic-based or graphite-based materials in the form of sintered fibers or powders. Wicks of different porosities can be used to accommodate different physical properties of liquid, such as density, viscosity, surface tension, and vapor pressure. A wick should be adequate so that the required amount of liquid can be distributed to the heating element. The wick and heating element must be adequate so that the required amount of aerosol can be transported to the user.
    [00053] In the embodiment shown in Figure 1, hardware 109 and blowing detection system 111 are preferably programmable. The hardware 109 and breath detection system 111 can be used to control the operation of the device. This helps to control the particle size in the aerosol.
    [00054] Figure 1 shows an example of an electrically heated aerosol generation system that can be used with the present invention. Many other examples are usable in the invention, however. The electrically heated aerosol generation system simply needs to include or receive an aerosol-forming substrate that can be heated by at least one electrical heating element, powered by a power supply under the control of the electrical circuit. For example, the system does not have to be a smoking system. For example, the aerosol forming substrate can be a solid substrate, preferably than a liquid substrate. Alternatively, the aerosol forming substrate may be another form of a substrate, such as a gas substrate. The heating element can take any appropriate shape. The total shape and size of the housing can be changed, and the housing can comprise a separable housing and nozzle. Other variations are, of course, possible.
    [00055] As already mentioned, preferably, the electrical circuit comprising hardware 109 and the blowing detection system 111 is programmable in order to control the energy supply to the heating element. This, in turn, affects the heating profile which will affect the properties of the aerosol. The term "heating profile" refers to a graphical representation of the energy supplied to the heating element (or other similar measure, for example, the heat generated by the heating element) over the time taken for a blow. Alternatively, hardware 109 and the blowing detection system 111 can be hardware connected to control the power supply to the heating element. Again, this will affect the heating profile which will affect the particle size in the aerosol. Various methods of controlling the energy supplied to the heating element are illustrated in Figures 2 to 7.
    [00056] Figure 2 shows a first embodiment of a method for controlling the heating energy to a heating element of an electrically heated aerosol generating system, according to the invention.
    [00057] Figure 2 is a graph showing the air flow rate 201 and heating energy 203 on the vertical axis, and time 205 on the horizontal axis. The air flow rate 201 is shown by a solid line and the heating energy 203 is shown by a dashed line. The rate of air flow is measured in volume per unit time, typically cubic centimeters per second. The air flow rate is detected by a blowing detection system, such as a blowing detection system 111 in Figure 1. The heating energy, measured in Watts, is the energy supplied to the heating element from the supply of air. power, under the control of the electrical circuit, such as hardware 109 in Figure 1. Figure 2 shows a single breath given by a user in an electrically heated aerosol generation system, such as that shown in Figure 1.
    [00058] As can be seen in Figure 2, in this embodiment, the air flow rate for the blow is illustrated as taking the form of a normal or Gaussian distribution. The air flow rate starts at zero, gradually increases to a maximum of 201 max, then decreases back to zero. However, the air flow rate will typically not have an exact Gaussian distribution. In all cases, however, the rate of air flow through a blow will increase from zero to a maximum, the decrease from maximum to zero. The area under the air flow rate curve is the total air volume for that blow.
    [00059] When the blowing detection system detects that the air flow rate 201 has increased to a limit 201a, at a time 205a, the electrical circuit controls the energy to turn on the heating element, and increases the heating energy 203 directly from zero to 203a energy. When the blowing detection system detects that the air flow rate 201 decreases back to the limit 201a, at a time 205b, the electrical circuit controls the energy to turn off the heating element, and decreases the heating energy 203 directly from the 203a energy to zero. Between time 205a and time 205b, while the blowing detection system detects that the air flow rate remains higher than the threshold 201a, the heating energy for the heating element is maintained at energy 203a. Thus, the warm-up period is time 205b - 205a.
    [00060] In the embodiment of Figure 2, a limit of the rate of air flow to turn on the heating element is the same as the limit of the rate of air flow to turn off the heating element. The advantage of the arrangement in Figure 2 is the simplicity of design. However, with this arrangement there is a risk of overheating towards the end of the breath. This is shown in Figure 2 in circle area 207.
    [00061] Figure 3 shows a second embodiment of a method for controlling the heating energy to a heating element of an electrically heated aerosol generating system, according to the invention. The arrangement in Figure 3 can, in some circumstances, provide an improvement over the arrangement shown in Figure 2.
    [00062] Figure 3 is a graph showing the rate of air flow 301 and heating energy 303 on the vertical axis, and time 305 on the horizontal axis. The air flow rate 301 is shown by a solid line and the heating energy 303 is shown by a dashed line. Again, the rate of air flow is measured in volume per unit time, typically cubic centimeters per second. The air flow rate is detected by a blowing detection system, such as a blowing detection system 111 in Figure 1. The heating energy, measured in Watts, is the energy supplied to the heating element from the supply of air. power, under the control of the electrical circuit, such as hardware 109 in Figure 1. Figure 3 shows a single breath given by a user in an electrically heated aerosol generation system, such as that shown in Figure 1.
    [00063] As in Figure 2, the air flow rate for the blow is illustrated as taking the form of a Gaussian distribution, although this need not be the case. In fact, in many cases, the air flow rate curve will not form an exact Gaussian distribution. The air flow rate starts at zero, gradually increases to a maximum of 301 max, then decreases back to zero. The area under the air flow rate curve is the total air volume for that blow.
    [00064] When the blowing detection system detects that the airflow rate 301 has increased to a limit 301a, at a time 305a, the electrical circuit controls the energy to turn on the heating element and increases the heating energy 303 directly from zero to energy 303a. When the blowing detection system detects that the airflow rate 301 decreases to a limit 301b, at a time 305b, the electrical circuit controls the energy to turn off the heating element and decreases the heating energy 303 directly from the energy 303a to zero. Between time 305a and time 305b, the heating energy for the heating element is maintained at energy 303a. Thus, the warm-up period is time 305b - 305a.
    [00065] In the embodiment of Figure 3, the limit of the air flow rate 301b for turning off the heating element is greater than the limit of the air flow rate 301a for turning on the heating element. This means that the heating element is disconnected earlier from the blow than in the arrangement in Figure 2. This prevents possible overheating towards the end of the blow. Note that the reduced area of the circle area 307 in Figure 3 compared to the circle area 207 in Figure 2. Turning off the heating element earlier in the blast means that there is a greater flow of air as the heating element is cooling. This can prevent much more condensation from forming on the inner surface of the housing. This can, in turn, reduce the possibility of liquid leakage.
    [00066] Figure 4 shows a third embodiment of a method for controlling heating energy to a heating element of an electrically heated aerosol generating system, according to the invention, which is similar to the embodiment shown in Figure 3. The arrangement in Figure 4 can also, in some circumstances, provide an improvement over the arrangement shown in Figure 2.
    [00067] Figure 4 is a graph showing airflow rate 401 and heating energy 403 on the vertical axis, and time 405 on the horizontal axis. The airflow rate 401 is shown by a solid line and the heating energy 403 is shown by a dashed line. Again, the rate of air flow is measured in volume per unit time, typically cubic centimeters per second. The air flow rate is detected by a blowing detection system, such as a blowing detection system 111 in Figure 1. The heating energy, measured in Watts, is the energy supplied to the heating element from the supply of air. energy, under the control of the electrical circuit, such as hardware 109 in Figure 1. Figure 4 shows a single breath given by a user in an electrically heated aerosol generation system, as shown in Figure 1.
    [00068] As in Figures 2 and 3, the air flow rate for the blow takes the form of a Gaussian distribution, although this need not be the case. The airflow rate starts at zero, gradually increases to a maximum of 401 max, then decreases back to zero. The area under the air flow rate curve is the total air volume for that blow.
    [00069] When the blowing detection system detects that the airflow rate 401 has increased to a limit 401a, at a time 405a, the electrical circuit controls the energy to turn on the heating element, and increases the heating energy 403 directly from zero to 403a energy. When the blowing detection system detects that the airflow rate 401 decreases to a limit 401b, at a time 405b, the electrical circuit controls the energy to turn off the heating element, and decreases the heating energy 403 directly from the energy 403a to zero. The difference between Figures 3 and 4 is that, in Figure 4, the 401 b limit for turning off the heating element is related to the maximum air flow rate 401 max. In this case, the 401 b airflow rate limit is% the max 401 airflow rate, although the 401 b airflow rate limit may have any relationship appropriate to the max 401 airflow rate . The relationship may depend on the shape of the air flow rate curve. Between time 405a and time 405b, the heating energy for the heating element is maintained at energy 403a. Thus, the warm-up period is time 405b - 405a.
    [00070] In the embodiment of Figure 4, because the limit of the air flow rate to turn off the heating element is related to the maximum air flow rate, the limit of the air flow rate to turn off the heating element can be more appropriate to the blowing profile. By adjusting the relationship between the limit and the maximum airflow rate appropriately, the heat can be maintained for an appropriate heating period, while avoiding overheating towards the end of the blow. Note that the reduced area of the circle area 407 in Figure 4 compared to the circle area 207 in Figure 2, and even the circle area 307 in Figure 3. Turning off the heating element earlier in the blast means that there is increased airflow as the heating element is cooling. This can prevent much more condensation from forming on the housing surface. This can, in turn, reduce the possibility of liquid leakage.
    [00071] Figure 5 shows a fourth embodiment of a method for controlling heating energy to a heating element of an electrically heated aerosol generating system, according to the invention, which is similar to the embodiments shown in Figures 3 and 4. The arrangement in Figure 5 can also, in some circumstances, provide an improvement over the arrangement shown in Figure 2.
    [00072] Figure 5 is a graph showing the air flow rate 501 and the heating energy 503 on the vertical axis, and the time 505 on the horizontal axis. The air flow rate 501 is shown by a solid line and the heating energy 503 is shown by a dashed line. Again, the rate of air flow is measured in volume per unit time, typically cubic centimeters per second. The air flow rate is detected by a blowing detection system, such as a blowing detection system 111 in Figure 1. The heating energy, measured in Watts, is the energy supplied to the heating element from the supply of air. power, under the control of the electrical circuit, such as hardware 109 in Figure 1. Figure 5 shows a single breath given by a user in an electrically heated aerosol generation system, such as that shown in Figure 1.
    [00073] As in Figures 2, 3 and 4, the air flow rate for the blow is illustrated as taking the form of a Gaussian or normal distribution. However, this need not be the case. The airflow rate starts at zero, gradually increases to a maximum of 501 max, then decreases back to zero. The area under the air flow rate curve is the total air volume for that blow.
    [00074] When the blowing detection system detects that the airflow rate 501 has increased to a limit 501a, at a time 505a, the electrical circuit controls the energy to turn off the heating element, and increases the heating energy 501 directly from zero to 503a energy. When the blowing detection system detects that the airflow rate 501 decreases to a limit 501b, at a time 505b, the electrical circuit controls the energy to start decreasing the energy 503a. Unlike Figures 2, 3 and 4, the electrical circuit gradually decreases the heating energy for the heating element, starting at time 505b, finally reaching zero energy at time 505c. Therefore, between time 505a and time 505b, the heating energy for the heating element is maintained at energy 503a. At time 505b, the heating energy for the heating element is gradually decreased over time until, at time 505c, the heating energy supplied to the heating element is zero. Thus, the total warm-up period is time 505c - 505a, with energy decreasing between time 505b and 505c. The heating energy can be decreased at a constant rate as shown by the straight line in Figure 5. Alternatively, the heating energy can be decreased at a non-constant rate. As already discussed, it may be advantageous to turn off the heating element earlier in the blow to reduce the time the heating element is heating up, but the air flow is reduced. In this way, the decrease in the slope of the heating energy can be provided to match the slope of the airflow profile as close as possible, thereby minimizing overheating. The heating energy can be decreased at a constant rate, and the slope can be approximated to the air flow profile curve. Alternatively, the heating energy can be decreased at a non-constant rate and the rate of decrease can be matched as closely as possible to the air flow profile curve. These approaches can reduce the amount of condensation that forms, and this can reduce liquid leakage.
    [00075] In the embodiment of Figure 5, because the energy supplied to the heating element is reduced gradually, preferably than reduced to zero immediately, the heating profile may be more appropriate to the air flow profile, while reducing the use of energy. The decrease in energy can be arranged to follow or match the slope of the air flow profile as it decreases, thereby providing a very suitable heating profile for the blow.
    [00076] Figure 6 shows a fifth embodiment of a method for controlling the heating energy to a heating element of an electrically heated aerosol generating system, according to the invention.
    [00077] Figure 6 is a graph showing airflow rate 601 and heating energy 603 on the vertical axis, and time 605 on the horizontal axis. The air flow rate 601 is shown by a solid line and the heating energy 603 is shown by a dashed line. Again, the rate of air flow is measured in volume per unit time, typically cubic centimeters per second. The air flow rate is detected by a blowing detection system, such as the blowing detection system 111 in Figure 1. The heating energy, measured in Watts, is the energy supplied to the heating element from the supply of energy, under the control of the electrical circuit, such as hardware 109 in Figure 1. Figure 6 shows a single breath given by a user in an electrically heated aerosol generation system, such as that shown in Figure 1.
    [00078] As in Figures 2, 3, 4 and 5, the air flow rate for the blow is illustrated as taking the form of a Gaussian or normal distribution. However, this need not be the case. The airflow rate starts at zero, gradually increases to a maximum of 601 max, then decreases back to zero. The area under the air flow rate curve is the total air volume for that blow.
    [00079] When the blowing detection system detects that the airflow rate 601 has increased to a limit 601a, at a time 605a, the electrical circuit controls the energy to turn on the heating element, and increases the heating energy 603 In the arrangement in Figure 6, the heating energy is increased at the beginning of the blow, at time 605a, to an energy 603a. Then, in a subsequent time 605b, the heating energy decreases to the energy 603b having a lower value than the energy 603a. The regulating period between time 605a and time 605b will depend on the structure of the heating element and, consequently, how quickly the heating element will heat up in response to energy input. Thereafter, the heating energy is maintained at the 603b energy level. When the blowing detection system detects that the airflow rate 601 decreases to the limit 601a, in a time 605c, the electrical circuit controls the energy to turn off the heating element, and decreases the heating energy of the energy 603b to zero . Thus, the warm-up period is time 605c - 605a, with the initial energy between times 605a and 605b being 603a and the subsequent energy for most of the duration of the airflow, between time 605b and time 605c being 603b , lower than 603a.
    [00080] Thus, in the embodiment of Figure 6, there is overheating at the beginning of the breath. This starts the aerosol generation earlier, which can give a better reactivity, that is, a shorter time to the first breath, for the user. This can also prevent very large aerosol particles or very highly concentrated aerosol from being generated at the beginning of the blow.
    [00081] Various embodiments have been described with reference to Figures 2 to 6. The person skilled in the art will appreciate, however, that any characteristics of these embodiments can be combined. For example, the one limit arrangement shown in Figure 2 can be combined with the gradual decrease in energy shown in Figure 5 and, in addition or alternatively, overheating at the beginning of a blow shown in Figure 6. Similarly, the two limit arrangements da, or Figure 3, or Figure 4, can be combined with the slow decrease in energy shown in Figure 5 and, in addition, or alternatively, overheating at the beginning of a breath shown in Figure 6.
    [00082] The particular heating profile may be dependent on the blowing profile for a particular user. The electrical circuit to control the energy supply to the heating element can be programmable. The electrical circuit can be programmed by the user so that a user can select a desired heating profile depending on the preferred aerosol characteristics. The electrical circuit can be intelligent, and capable of automatically providing the heating profile to the particular air flow profile, for example, on a blow-by-blow basis.
    [00083] Figure 7 shows how the heating energy to a heating element of an electrically heated aerosol generation system can be controlled, via a pulsed current signal.
    [00084] Figure 7 is a graph showing heating energy 703 and current intensity 707 on the vertical axis, and time 705 on the horizontal axis. In Figure 7, the heating energy 703 is shown by a dashed line and the current intensity 707 is shown by a solid line. The heating energy, measured in Watts, is the energy provided to the heating element from the power supply, under the control of the electrical circuit, such as hardware 109, in Figure 1. The current intensity is the current, measured in Amperes, which flow through the heating element, under the control of the electrical circuit, such as hardware 109, in Figure 1. Figure 7 shows a single breath given by a user in an electrically heated aerosol generation system, such as the one shown in Figure 1. Note that in Figure 7, however, the air flow rate is not shown.
    [00085] The heating profile shown in Figure 7 includes overheating at the beginning of the blow, similar to that shown in Figure 6. This is between times 705a and 705b. It also includes a gradual decrease in energy at the end of the breath, similar to that shown in Figure 5. This is between the times 705c and 705d. Between times 705b and 705c, energy is maintained at a substantially constant level. However, the control shown in Figure 7 can be used to provide any suitable heating profile.
    [00086] In Figure 7, when the blowing detection system detects that the air flow rate (not shown) has increased to a first limit, in time 705a, the electrical circuit controls the energy to turn on the heating element, and increases heating energy 703. Heating energy 703 is increased to energy 703a. The electrical circuit achieves this by providing a pulsed current signal through the heating element. In Figure 7, each pulse has a maximum current 707a and the frequency of the current pulses between time 705a and 705b is 709a.
    [00087] At time 705b, the electrical circuit controls the energy to reduce the heating energy to energy 703b and thereafter, the heating energy is maintained at energy 703b. The electrical circuit achieves this by providing a pulsed current signal through the heating element. In Figure 7, each pulse has a maximum current 707a and the frequency of the current pulses between time 705b and 705c is 709b, a lower frequency than frequency 709a.
    [00088] When the blowing detection system detects that the air flow rate (not shown) decreases to a second limit (which can be the same as or greater than the first limit), in time 705b, the electrical circuit controls energy to gradually decrease heating energy 703. Heating energy 703 is gradually decreased from energy 703b in time 705c to zero in time 705d. The electrical circuit achieves this by providing a pulsed current signal through the heating element. In Figure 7, each pulse has a maximum current 707a and the frequency of the current pulses between time 705c and 705d is 709c, a lower frequency than both 709a and 709b.
    [00089] In this way, the electrical circuit controls the energy supplied to the heating element from the energy supply by providing a pulsed current signal through the heating element. Figure 8 further shows how the heating energy for the heating element can be controlled, via the pulsed current signal. Figure 8 is a graph showing current intensity 707 on the vertical axis, and time 705 on the horizontal axis. Figure 8 shows two current pulses in greater detail.
    [00090] In Figure 8, the time during which the current signal is turned on is a. The time during which the current signal is switched off is b. The period of the pulsed current signal is Tque which is equal to 1/7, where the frequency of the pulsed current signal is authentic. The duty cycle (in%) of the pulsed current signal is equal to a / b x 100.
    [00091] The energy supplied to the heating element can be controlled by increasing or decreasing the frequency at a fixed duty cycle. In this case, the ratio of a: b remains constant, but the current values for a and b vary. For example, a and b can be kept equal to each other (duty cycle = 50%) with (a + b), and, consequently, the frequency, varying.
    [00092] Alternatively, the energy supplied to the heating element can be controlled by varying the duty cycle at a fixed frequency. In this case, the ratio of a: b changes with (a + b), and, consequently, the frequency remains fixed.
    [00093] Alternatively, both the duty cycle and the frequency can be varied, although this can be more complicated to implement. Figure 7, although preferably schematic in nature, does not show both the duty cycle and frequency varying. Referring to Figure 7, between time 705a and time 705b, the frequency is 709a. It can be seen that the duty cycle is on the order of 95%. Between time 705b and time 705c, the frequency is 709b, which is lower than frequency 709a. In addition, it can be seen that the duty cycle is on the order of 50%. Between time 705c and 705d, the frequency is 709c, lower than frequencies 709a and 709b. It can also be seen that the duty cycle is on the order of 33%.
    [00094] Thus, Figures 7 and 8 show that any particular heating profile can be established by the electrical circuit, by providing pulsed current signals through the heating element. The frequency or duty cycle, or both the frequency and duty cycle of the pulses will be appropriate to the heating energy required for a particular period of time, and if this heating energy is required to remain constant, it increases or decreases.
    [00095] The electrically heated aerosol generation method and system according to the present invention provides a number of advantages. The heating profile can be provided to the blowing profile, thereby providing an improved user experience. The heating profile can also produce desired aerosol properties. The heating profile can also affect the formation of condensed aerosol which, in turn, can affect the leakage of liquid. Energy use can be optimized to provide a good heating profile, without unnecessary energy loss.
    权利要求:
    Claims (11)
    [0001]
    1. Method for controlling at least one electrical heating element (119) of an electrically heated aerosol generating system (100) for heating an aerosol forming substrate (115), the system having a sensor (111) for detecting air flow indicative of a user blowing, having an air flow duration, the method comprising the steps of: increasing the heating energy of at least one heating element (119) from zero to an energy p1 when the sensor detects that the air flow rate has increased to a first limit; maintaining the heating energy in energy p1 for at least some of the duration of the air flow; and decreasing the heating energy by at least one heating element (119) of the energy p1 to zero when the sensor detects that the air flow rate has decreased to a second limit, characterized by the fact that the first flow rate limit of air is less than the second limit of the air flow rate.
    [0002]
    2. Method according to claim 1, characterized in that the step of increasing the heating energy for at least one heating element (119) from zero to energy p1 comprises increasing the heating energy from zero to energy p1 substantially instantly.
    [0003]
    Method according to claim 1 or 2, characterized in that the step of increasing the heating energy for at least one heating element (119) of the energy p1 to zero comprises decreasing the heating energy of the energy p1 to zero substantially instantly.
    [0004]
    Method according to either of claims 1 or 2, characterized in that the step of decreasing the heating energy for the at least one heating element (119) of the energy p1 to zero comprises decreasing the heating energy of energy p1 to zero gradually.
    [0005]
    Method according to any one of the preceding claims, characterized by the fact that it further comprises, after the step of increasing the heating energy for the at least one heating element (119) from zero to energy p1, the step of : increase the heating energy for at least one heating element from energy p1 to energy p2, greater than energy p1, and return the heating energy to energy p1 before the step of maintaining heating energy in energy p1 for at least part of the airflow duration.
    [0006]
    6. Method according to any one of the preceding claims, characterized in that the step of maintaining the heating energy at a p1 energy for at least some of the duration of the air flow comprises supplying pulses of electrical current to at least one heating element at a first frequency f1 and a first duty cycle.
    [0007]
    7. Method according to claim 4, characterized by the fact that the step of decreasing the heating energy of the energy p1 to zero gradually comprises supplying pulses of electrical current to at least one heating element at a second frequency f2 and a second service cycle.
    [0008]
    8. Method according to claim 5, characterized by the fact that the step of increasing the heating energy for at least one heating element of energy p1 to energy p2, greater than energy p1, comprises supplying current pulses electrical at least one heating element at a third frequency f3 and a third duty cycle.
    [0009]
    9. Electrically heated aerosol generating system (100) for heating an aerosol-forming substrate (115), the system comprising: at least one electric heating element (119) for heating the aerosol-forming substrate to form the aerosol; an energy supply (107) to supply energy to at least one electrical heating element (119); and electrical circuit (109) to control the energy supply from the energy supply to at least one electrical heating element, the electrical circuit including a sensor (111) to detect a user's indicative air flow giving a blow having a air flow duration; in which the electrical circuit (109) is arranged to increase the heating energy for the at least one heating element from zero to an energy p1 when the sensor detects that the air flow rate has increased to a first limit; to maintain the heating energy the energy p1 for at least some of the duration of the air flow; and decrease the heating energy for at least one heating element of the energy p1 to zero when the sensor detects that the air flow rate has decreased to a second limit, characterized by the fact that the first limit is less than the second limit.
    [0010]
    10. Electrically heated aerosol generation system according to claim 9, characterized in that the aerosol forming substrate (115) is a liquid substrate, and additionally comprising a capillary wick (117) to transport the liquid substrate at least one electrical heating element (119).
    [0011]
    11. Electric circuit (109) for an electrically heated aerosol generation system, characterized by the fact that it comprises at least one electric heating element and a sensor to detect air flow indicative of a user taking a drag for a duration of the flow of air, the electrical circuit being arranged to carry out the method as defined in any one of claims 1 to 8.
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    同族专利:
    公开号 | 公开日
    JP2013545474A|2013-12-26|
    ZA201303082B|2014-01-29|
    CN103237468A|2013-08-07|
    US20130340750A1|2013-12-26|
    CA2818076A1|2012-06-07|
    MY173405A|2020-01-22|
    HUE043716T2|2019-09-30|
    CA2818076C|2019-04-30|
    AU2011334843A1|2013-06-06|
    NZ610293A|2014-05-30|
    IL226009A|2018-01-31|
    KR20130139276A|2013-12-20|
    SI2645892T1|2019-05-31|
    TR201905189T4|2019-05-21|
    EA026405B1|2017-04-28|
    CN103237468B|2015-06-17|
    LT2645892T|2019-04-25|
    RS58673B1|2019-06-28|
    AU2011334843B2|2016-08-18|
    TWI535392B|2016-06-01|
    EP2645892A1|2013-10-09|
    JP5876069B2|2016-03-02|
    WO2012072790A1|2012-06-07|
    PT2645892T|2019-07-10|
    TW201302110A|2013-01-16|
    EP2460423A1|2012-06-06|
    IL226009D0|2013-06-27|
    SG190110A1|2013-06-28|
    MX2013006195A|2013-11-04|
    UA111478C2|2016-05-10|
    BR112013013298A2|2016-09-13|
    EA201390818A1|2014-02-28|
    DK2645892T3|2019-04-29|
    US9532600B2|2017-01-03|
    KR101922737B1|2018-11-27|
    EP2645892B1|2019-03-27|
    AR084096A1|2013-04-17|
    ES2722203T3|2019-08-08|
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    法律状态:
    2018-12-18| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-08-06| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-08-04| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|
    2020-12-22| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-02-23| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 02/12/2011, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    EP10252049A|EP2460423A1|2010-12-03|2010-12-03|An electrically heated aerosol generating system having improved heater control|
    EP10252049.1|2010-12-03|
    PCT/EP2011/071608|WO2012072790A1|2010-12-03|2011-12-02|An electrically heated aerosol generating system having improved heater control|
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