• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    method for estimating a temperature of a material being heated and apparatus for estimating the temperature of a material being heated is described a method for estimating a temperature of a material being heated. the method can comprise the supply of electricity to a heating element depending on a measured temperature, the calculation of a rate at which the amount of electricity supplied changes over time, comparison of the calculated rate with a plurality of known values in order to determine the value of a parameter in relation to the thermal properties of the material being heated and the calculation of an estimated temperature based on the determined value of said parameter. in some embodiments, the method may also include detecting a drop in the temperature of the material being heated, by detecting a change in the calculated rate at which the amount of electricity supplied changes over time.
    公开号:BR112012029140B1
    申请号:R112012029140-8
    申请日:2011-05-18
    公开日:2020-05-26
    发明作者:Marcel SLADECEK；Michael Tolk
    申请人:Koninklijke Philips N.V.；
    IPC主号:
    专利说明:

    METHOD FOR ESTIMATING A TEMPERATURE OF A MATERIAL BEING HEATED AND APPLIANCE TO ESTIMATE THE TEMPERATURE OF A MATERIAL BEING HEATED
    The present invention relates to a method for estimating a temperature. More particularly, the present invention relates to the estimation of a temperature based on the energy supplied to a heating element during a heating operation.
    A wide range of home appliances includes heating, such as kettles, rice cooker pots, soup heater processors, among others. In such cases it is usually desirable to control, from which the food is heated, or overcooked, heating is temperature for heating element. The heating element is pressure elements, food, appliances, temperature form it is not undercooked sensor devices in order to ensure that
    For this purpose, those typically provided with monitoring a controlled temperature supply in order to keep the temperature in a predetermined range.
    Figure 1 illustrates a conventional system for heating food. The system comprises a cooking surface 101, below which a heating element 102 is arranged. A temperature sensor 103 is arranged to monitor a temperature of the heating element 102. The system further comprises a power supply 104 to supply electrical energy to the heating element 102, and a control unit 105 to read a temperature from the temperature sensor 103 and displays the temperature on a screen 106. The material 108 to be heated (i.e., the food product that is to be cooked) is kept inside a container 107, which is heated by the heating element 102.
    2/22
    An additional temperature sensor 109 is provided on an internal surface of the container 107. This additional temperature sensor 109 is connected to an RFID tag (not shown), which transmits information about the current temperature of food product 108 to the control unit 105 via a wireless data connection 110. The control unit can then display a current temperature of food product 108 on screen 106 to allow a user to monitor a current temperature of food product 108. However, the system cost and complexity are increased by the need to provide an additional temperature sensor 109 and connection 110 to the control unit
    105.
    US 2008/0237215 Al discloses to control a cooking appliance, in which operation of a heat source is elevated a method the charge cycle is present and
    DE 19609116 document food measure. The one in which a US document when reduced when there is no charge. Al reveals a method for cooking central food temperature 2010/0012645 reveals a probe including a temperature to use in an oven, the transmitter probe and a thermogenerator to power the transmitter.
    The present invention has the objective of directing those inherent in the known dispositions, according to the present invention, it is provided an estimate of a temperature of a material being claim 1, and an apparatus for a material being heated according to disadvantages
    A method for according to the heated method of estimating the temperature of claim 9.
    According to the present invention, a method is provided to estimate a temperature of a material being heated, the method comprising the supply of electrical energy to a heating element depending on a
    3/22 measured temperature, calculating a rate at which the amount of electricity supplied changes over time, comparing the calculated rate with a plurality of known values in order to determine the value of a parameter with respect to properties temperatures of the material being heated, and the calculation of an estimated temperature based on the determined value of said parameter.
    The supply of electrical energy to the heating element can comprise turning on and off the energy supplied depending on the measured temperature.
    The method can also comprise the application of a medium motion filter to the recorded data on the electricity supplied, before calculating the rate at which the amount of electricity supplied changes over time.
    The temperature can be calculated based on the equation where t is an estimated temperature, T o and an initial temperature, T f is a predefined temperature, t the time elapsed since the start of heating, and B is the parameter with respect to thermal properties of the material being heated.
    The measured temperature can be a temperature of the heating element or a layer of the interface between the heating element and a container containing the material being heated, for example, a cooking surface.
    Supplying electrical energy to the heating element may comprise providing electrical energy 30 to maintain a measured temperature value within a predetermined temperature range.
    The method can also comprise the detection of a
    4/22 drop in temperature of the material being heated, by detecting a change in the amount of electrical energy calculated rate provided changes in time.
    in which when passing understand the detect the drop of energy recalculation of the temperature, electrical
    The method can still estimated temperature after based on the data recorded on the one supplied before and after the temperature drop.
    According to the present invention, there is also provided the temperature of a material being apparatus comprising a container arranged the material to be heated, an element of an energy supply arranged for heating element, a temperature, and controlling the measured temperature, in that the calculator unit arranged for an apparatus to estimate the heated, or to contain heating, supply electrical energy to the temperature sensor arranged to measure a control unit arranged to supply electricity to the element in the control dependency comprises a first calculating a rate at which the amount of electricity supplied changes over time, a comparator willing to compare the calculated rate with a plurality of known values in order to determine the value of a parameter with that of the material being heated, willing to calculate a temperature value determined of said parameter.
    it may further comprise a unit between the power supply and the power, the switching unit being between an ON state in which electrical power and the heating element and an OFF electrical state is not supplied to the control unit element can be arranged in relation to thermal properties and another calculator estimated based on the
    The appliance connected switching element switchable provided which heating energy, in which the
    5/22 to repeatedly switch the switching unit between the ON and OFF states depending on the measured temperature.
    The control unit may also be willing to apply a medium motion filter to the recorded data on the electricity supplied, before calculating the rate at which an amount of electricity supplied changes over time.
    The temperature sensor can be arranged in proximity to the heating element to measure a temperature of the heating element or a layer of the interface between the heating element and the container, such as a cooking surface.
    The control unit may be arranged to supply electrical energy to the heating element to maintain a measured temperature value within a predetermined temperature range.
    The control unit may be arranged to detect a drop in temperature of the material being heated 20 by detecting a change in the calculated rate at which an amount of electricity supplied changes over time.
    The control unit may also be willing to recalculate the estimated temperature after detecting the temperature drop, based on the recorded data on the electrical energy supplied before and after the temperature drop.
    The realizations of the invention will now be described, with reference to the accompanying drawings, in which:
    30 Ά figure 1 schematically illustrates a conventional system for measuring the temperature of a heated material;
    Figure 2 illustrates a system according to a
    6/22 realization of the invention;
    Figure 3 is a graph showing the graphs of temperature versus time for a heating element and a material being heated, according to an embodiment of the invention;
    Figure 4 is a graph showing the energy supplied to a heating element during the heating operation illustrated in Figure 3;
    Figure 5 is a graph showing the curves of filtered energy for different volumes of the heated material, according to an embodiment of the invention;
    Figure 6 is a graph showing the curves of the estimated temperature and current temperature against time, according to an embodiment of the invention;
    15 Figure 7 is a flowchart illustrating a method for estimating the temperature of a heated material, according to one embodiment of the invention;
    Figure 8 shows a temperature drop during a heating operation, according to an embodiment of the invention;
    Figure 9 is a graph showing the energy supplied to a heating element during the heating operation illustrated in Figure 8,
    Figure 10 is a graph showing a filtered energy curve for the heating operation illustrated in Figure 8;
    Figure 11 schematically illustrates a system according to an embodiment of the invention;
    Figure 12 schematically illustrates a system according to an embodiment of the invention; and
    Figure 13 schematically illustrates a system according to an embodiment of the invention.
    Now with reference to figure 2, a system and
    7/22 illustrated in accordance with an embodiment of the present invention. The system comprises a heating surface 201, a heating element 202, a temperature sensor 203, a power supply 204, a control unit 205, and a screen 206. A container 207 is placed in contact with the heating surface. heating 201 in order to heat the contents 208 of the container 207. In the present embodiment, the contents
    208 comprise a liquid, but in other embodiments the contents may comprise a solid or a mixture of liquids and solids.
    The system also comprises a switching unit
    209 connected between the power supply 204 and the heating element 202. The control unit 205 is arranged to control the switching unit 209 to intermittently interrupt the power supply to the heating element 202, according to temperature sensed by the temperature sensor 203. By providing energy intermittently, a temperature of the heating element 202 can be maintained within a desired temperature range. An excess of temperature, which would result in the burning of material in the vicinity of the heating element, can also be prevented. This technique will be described in more detail later.
    Unlike the conventional system illustrated in figure 1, in the present embodiment there is no temperature sensor arranged to directly feel a temperature of the contents 208. Also, a memory 210 is provided to store information about a correlation between the heating of the energy curves and the thermal properties 30 of the contents 208. The control unit 205 is arranged to monitor the energy supplied to the heating element 202 during heating, and the use of this information with the 'information stored in memory 210 to estimate the value
    8/22 of a parameter describing the thermal properties of the contents 208. The control unit 205 can then calculate an estimated current temperature of the contents 208, and display the current estimated temperature on screen 206.
    In this way, in the present embodiment, the control unit 205 can derive a current temperature from the contents 208 being heated, without requiring an additional temperature sensor to be provided in direct contact with the contents 208. In addition, in the realizations where a container is provided as a separate unit from a unit housing the heating element and other components, a wireless connection between the container and the control unit can be omitted.
    A method by which the control unit 205 can calculate an estimated current temperature of the contents 208 will now be described with reference to figures 3 to 6.
    With reference to figure 3, a graph is shown illustrating the temperature versus time curves for a heating element and a material being heated, according to an embodiment of the present invention. A first curve 301 shows the temperature detected by a temperature sensor placed in the vicinity of the heating element (cf. temperature sensor 203 in figure 2). This temperature increases and decreases repeatedly as a result of the energy being intermittently supplied to the heating element, since the control unit turns off or turns off the supplied energy according to the measured temperature of the heating element.
    A second curve 302 shows the temperature of the contents of a container being heated by the heating element. This curve is provided for reference and is obtained during a calibration procedure by means of an additional temperature sensor, which is placed in contact
    9/22 straight with the material being heated. During a normal heating operation, this additional temperature sensor can be omitted (cf. figure 2, in which no temperature sensor is arranged to directly measure a temperature of the contents 208).
    As shown in figure 3, the material being heated (cf. second curve 302) remains at a lower temperature than the heating element (cf. first curve 301), and changes the temperature more quickly than the heating element. heating. In this way, it is not possible to calculate the temperature of the heated material directly from a known heating element temperature. However, a user may be more interested in knowing the current temperature of the heated material (for example, a food product such as soup, rice, pasta etc.) than the heating element itself. The embodiments of the present invention allow the current temperature of the heated material to be estimated by monitoring the energy supplied to the heating element, which will vary depending on the thermal properties of the heated material.
    Now with reference to figure 4, a graph is shown illustrating the energy supplied to the heating element during the heating operation illustrated in figure 3. As shown in figure 4, the energy is supplied intermittently as the switching unit is repeatedly turned on and turned off by the control unit (see figure 2). More specifically, the control unit is arranged to supply energy in short pulses in order to quickly heat the heating element, with the next pulse being provided once the measured temperature of the heating element drops to a certain level. During the initial heating stages, it is necessary to supply a relatively large amount of energy
    10/22 high, as the material to be heated is at a low temperature. In this way the pulses of relatively long duration are applied at this stage. In addition, during the initial heating of the container and the contents, they are cooled compared to the heating element. In this way, the temperature of the heating element drops quickly when energy is not supplied, as energy is quickly transferred to the container and contents. This results in pulses being applied at a high frequency during the initial warm-up stages.
    As the contents approach a desired target temperature (about 50 ° C in the present embodiment), the contents and heating elements are close in temperature and thus heat is conducted away from the heating element less quickly. In this way, less energy is needed to maintain the temperature of the heating element within a certain temperature range. Thus, as the contents approach the target temperature, the duration and frequency of pulses are reduced.
    From the above description, it can be understood that the rate at which energy is supplied to the heating element during heating will vary depending on the thermal inertia of the material being heated. For example, a material with a high specific heat capacity and low thermal conductivity will require more energy to be heated to a specific temperature, than a material with a low specific heat capacity and high thermal conductivity.
    Now with reference to figure 5, a graph is shown illustrating the filtered energy curves for different volumes of heated material, according to an embodiment of the present invention. A filtered energy curve can be obtained by applying a medium motion filter to the supplied energy data as shown in
    11/22 figure 4. The moving average can also be referred to as the floating average, rolling average or rolling medium. In the present embodiment, an average of movement is calculated for each point on the curve (that is, each point in time) considering the average value of all points within a certain distance from the current point. The person skilled in the art will be aware of the various methods for applying a medium motion filter, so a detailed description will be omitted here in order to keep it short.
    Applying a medium motion filter has the effect of smoothing the energy curve shown in figure 4, and substantially removes periodic fluctuations. The filtered energy curves in figure 5, then, provide a clear indication of how the amount of energy supplied to the heating element decreases over time, as the heated material approaches the target temperature.
    As noted above, the rate at which an amount of energy delivered reduces will be dependent on the thermal inertia of the material being heated. Thermal inertia considers such factors as material volume, specific heat capacity, and thermal conductivity. For example, a larger volume of water will have a higher thermal inertia than a smaller volume, since more energy is needed to heat the largest volume at any given temperature. In figure 5, a first filtered energy curve 501 corresponds to the energy supplied during heating 1.0 liters of water, a second filtered energy curve 502 corresponds to the energy supplied during heating 0.5 liters of water, and a third filtered energy curve 503 corresponds to the energy supplied when heating 0.2 liters of water. Each curve can be fitted to a straight line as shown by the dotted lines in figure 5, in order to calculate a gradient. In the present embodiment, the
    12/22 third curve 503 has the highest gradient (that is, the most negative), since it is faster to heat 0.2 liters of water than 0.5 liters or 1 liter, and thus the energy supplied reduces more quickly.
    Any type and / or determined volume of the material can be characterized by a thermal parameter B, which describes the thermal inertia of this material. The value of B can of the material being heated, but also of how the thermal properties of a container of a value does not depend only on other factors that hold the material. In addition, the characteristic display of thermal parameter B, a particular material can also exhibit a characteristic gradient in a filtered energy curve (cf.
    calibration can be a reference are obtained for thermal parameter B and as for the
    In the embodiments of the present invention, reference can be stored in visualization in a non-volatile memory (cf. figure 5). In this way, a process performed, in which the values of different samples for both the gradient of filtered energy, of these values is a memory table 210 of figure 2).
    Now with reference to figure 6, a graph is shown illustrating curves of the estimated temperature and the current temperature against time, in accordance with the present invention. The first curve 601 (solid line) illustrates the data measured for the current temperature of a material being heated, while a second curve 602 (dotted-dashed line) illustrates the estimated temperature data obtained according to an embodiment of the present invention. The estimated temperature curve 602 can be obtained by a control unit that monitors the energy supplied to a heating element during a heating operation, applying a medium motion filter to the energy data supplied, calculating a gradient of the energy curve.
    13/22 filtered energy, and stored in a thermal parameter B present realization, thermal parameter determined heating operation) can be obtained using the visualization table equation to obtain a calculated gradient value. Once a value is obtained for B, the estimated temperature t is time t (that is, a time after starting by consulting a memory in order associated with the one where To is an initial temperature and T t is a target temperature (which can be defined by a user).
    In the present embodiment, the initial temperature T, is a temperature measured by the temperature sensor at the beginning of the heating operation, that is, at t = 0. Emt-0, the heating element has not yet been switched on and is cold. As a result, the temperature of the heating element does not significantly affect the temperature measured at t = 0. The initial temperature particularly for a thermal sensor with the contents as well as the heating element.
    However, in other embodiments, the step of measuring a temperature is omitted. For example, certain embodiments of the invention can be designated for particular material, which is typically specific temperature. In these cases, the can be willing to assume that it corresponds to this specific temperature, system is designed to heat the frozen, the initial temperature can be assumed as «C. If the system is designed to heat the measured food it can then correspond to the current temperature of the contents, as the temperature is willing to be in good contact with the initial present and can be used with a stored unit in an initial temperature control.
    For example, if state food
    14/22 frozen typically stored in a refrigerator, the initial temperature can be assumed to be 2 ° C. If the system is designed to heat food typically stored at room temperature, the initial temperature can be assumed to be 20 ° C.
    As shown in figure 6, the estimated temperature of the material being heated shows a good agreement with the current temperature (that is, measured) at any point. The slight discrepancy in the initial heating stage is due to an excess algorithm employed by a control unit to control the heating element, in the present embodiment.
    During the calibration process, B values can be determined empirically for each type and / or volume of material. Specifically, during calibration, a heating curve can be obtained by directly measuring the temperature of the material. Using the above equation, a value of B can then be determined by providing the best fit on the current measured temperature curve.
    20 In certain embodiments of the present invention, the control unit may be arranged to wait until a predetermined number of data points is recorded before calculating an estimated temperature. This can ensure that the estimated temperature is calculated to a desired degree of accuracy. As an example, the control unit can wait until several data points are registered.
    In the present embodiment, the control unit is willing to record data on the energy supplied at a sampling rate of 5 Hz, that is, each 0.2 s of the control unit records the level at which the energy is being supplied to the element of heating. The control unit is still ready to start calculating a temperature
    15/22 estimated after approximately three cycles of heating element on / off. As shown in figures 3 and 4, in the present embodiment these cycles have a period of approximately 25 s, meaning that the control unit 5 waits until approximately 375 data points are recorded before calculating an estimated temperature. The control unit then recalculates the estimated temperature at regular intervals in order to regularly provide an estimated updated temperature to a user.
    L0 In other embodiments of the present invention, however, the control unit can be arranged to only calculate the estimated temperature in response to a user request to display the estimated temperature. Alternatively, other embodiments of the present invention cannot display the estimated temperature to a user, but can still automatically modify the heating operation based on the estimated temperature, for example, using a return loop to maintain the estimated temperature at a value constant.
    20 Referring now to Figure 7, shown is a flow diagram illustrating a method and to estimate the temperature of a heated material, according to one embodiment of the present invention. Starting at step S701, a system begins a heating operation in order to heat a food product to a desired temperature. Then, moving to step S702 the system monitors the energy supplied to the heating element. In the present embodiment, monitoring the energy supplied comprises periodically recording a level at which energy is currently supplied to the heating element. By recording a plurality of values over a given period of time, the system accumulates a set of data that illustrates how the energy supplied varies with time.
    16/22
    Then, in step S703, the system processes the recorded data about the energy supplied in order to calculate a rate at which the energy supplied changes over time. In the present embodiment, this step comprises applying a medium motion filter 5 to the recorded data in order to substantially smooth the large fluctuations according to the on / off energy. After applying the medium motion filter, the system calculates the gradient of a straight line that offers the best fit on the filtered energy curve (cf.
    figure 5).
    Then, in step S704, the system queries a visualization table stored in memory, in order to locate a value of thermal parameter B that corresponds to the rate calculated in step S703. Finally,. in step S705 the system uses this recovered value of B to calculate an estimated current temperature of the material being heated. The system can then display this estimated temperature to a user. In certain embodiments, in addition to or instead of displaying the estimated temperature, the estimated temperature can be used to adjust the heating element control in order to precisely maintain the heated material to a desired temperature.
    Now with reference to figure 8, a graph is shown illustrating a temperature drop during a heating operation, according to an embodiment of the present invention. The heating operation is similar in many respects to that described above with respect to figures 3 and 4, and so a detailed description will be omitted here in order to maintain brevity. Briefly, Fig. 8 30 illustrates a first curve 801 showing a temperature of a heating element during a heating operation, and a second curve 802 showing the measured temperature of a material being heated.
    17/22
    In the present embodiment, at approximately 500 s the temperature of the material being heated suddenly drops to approximately 5 ° C. This is due to the addition of cooler material to the heating vessel. In addition, as shown in figure 8, it is possible to detect this drop in temperature simply by monitoring a temperature of the heating element (cf. first curve 801), since the addition of the cooling material has little or no effect on the temperature of the heating element. However, the corresponding reduction in the temperature of the heated material can be detected by monitoring the energy supplied to the heating element, as will now be described with reference to figures 9 and 10.
    element of illustrated in
    500 s indicates one illustrates the energy supplied to the heating operation The dotted line to approximately which material is being cooled further and being heated. As this results in being heated, as well as it becomes necessary to have the material at the target temperature. Thus, figure 9 heating during figure 8.
    added to the point in the material mass of the material an increase in the total reduction plus energy at the target temperature and keep it after adding more material at the temperature, in order to make supply return to cold at approximately => uu b, a corresponding increase follows in the pulse frequency of the energy supplied to the heating element.
    Figure 10 illustrates a filtered energy curve for the heating operation illustrated in figure 8, obtained by applying the data shown in figure 9.
    of filtered energy following the addition of the material at approximately 500 s. In this way, the system detects the temperature drop and controls a screen with a medium motion filter. There is a significant increase in the more cold signal it can
    18/22 indicate this drop in temperature to a user, even if a temperature sensor provided to control the heating element is not sensitive enough to detect the drop in temperature directly.
    After detecting a drop in temperature, the system can recalculate the estimated temperature. In the present embodiment, the control unit is arranged to wait until an on / off cycle of the power supply is completed, after the temperature drop is detected.
    At this point, a medium motion filter is applied to the data before and after the point at which the temperature drop was detected, and the estimated temperature is calculated based on the resulting filtered energy curve.
    In this way, although the control unit can wait for the on / off cycles at the start of the heating operation before calculating an estimated temperature, when a temperature drop is detected an updated temperature can be calculated more quickly. This is because data for the energy supplied before the temperature drop 20 is available, in which no data is available before the start of a heating operation.
    As an example, the control unit may be willing to calculate a new estimated temperature just after the temperature drop assuming that a value of thermal parameter B is not changed before the temperature drop. As more data is accumulated, the control unit can recalculate the gradient after the temperature drop (for example, after 3 cycles on / off following the temperature drop), and retrieve an updated value from thermal parameter B.
    Referring now to Figure 11, a system 1100 is schematically illustrated according to an embodiment of the present invention. To clarify figure 11, the elements
    19/22 as the control unit, power supply, screen, memory and switching unit (cf. figure 2) are illustrated as a single control block 1105. System 1100 comprises a body 1101 which is formed with a recess for 5 receive a container 1102 that holds the food product 1103 to be cooked. In the present embodiment, the container 1102 is formed separately from the body 1101 so that the container can be removed, for example, in order to allow the container to be easily emptied and cleaned.
    However, in other embodiments, the container can be formed integral with the body. A system like the one illustrated in figure 11 can offer an advantage in that the body 1101 can be adapted to receive only a specific container 1102. In this way, it can be guaranteed that the same container 15 1102 is always used during a heating operation, and thus the system can be precisely calibrated in this particular container 1102. In this way the accuracy at which a current temperature of the material being heated (ie food product 1103) can be calculated can be improved, since the thermal properties of the container can be substantially constant, and thus any change in the gradient of the filtered energy curve (cf. figure 5) can be attributed to food product 1103.
    25 Referring now to Figure 12, a system is illustrated in accordance with an embodiment of the present invention. In the present embodiment, a heating surface 1201 of the system comprises a cooking surface like an electric button, and the container 1207 comprises a vessel. This system can allow a range of different containers to be used. According to the measured gradient of a filtered energy curve <cf. figure 5) may be dependent on the thermal properties of the container as well as the material being
    20/22 heated, in certain embodiments the system may be restricted to use with containers of a particular range of kitchen utensils, in which the different containers are arranged to have similar thermal properties.
    Now with reference to figure 13, a system is illustrated according to an embodiment of the present invention. The system is similar to that illustrated in figure 12, but differs in that the container 1307 comprises an RFID tag 1302 for transmitting information about the container 1307 to the control block 13 05 through a wireless data connection 1303. This system may be suitable for use with a plurality of different containers, each having substantially different thermal properties. RFID tag 1302 can store information to identify particular container 1307, or to provide specific information about thermal properties of container 1307. Control block 1305 can receive this information from RFID tag 1302, and interpret a measured gradient of the energy curve filtered (see figure 5) based on the information received. For example, during configuration of the system, a visualization table can be provided with a plurality of data corresponding to the different classes of the container, with the RFID tag 1302 that provides information identifying a class to which the particular container 1302 belongs. The control block 1305 can then be arranged to search a particular section of the visualization table corresponding to the identified class.
    The system can offer an advantage that even when containers with substantially different thermal properties are used, the system can still accurately calculate an estimated current temperature of a material being heated, by means of receiving the information that can be used to identify the
    21/22 particular container being used. Although in the present example this information is stored on an RFID tag, the person skilled in the art will note that other provisions can be used. For example, container 1307 and the heating surface can be provided with metal-to-metal contacts to form a direct wired connection between control block 135 and a memory unit within container 1307.
    While certain embodiments of the present invention 10 have been described above, it will be clear to the skilled person that many variations and modifications are possible while still remaining within the scope of the invention as defined by the claims.
    For example, the embodiments of the present invention have been described in which a heating element is repeatedly controlled by turning on or off a connection in a power supply, according to a measured temperature of the heating element. However, in other embodiments, a variable power supply can be used, in which case the switching unit can be omitted and the control unit can control the power supply directly. In such embodiments, it may be possible to calculate a gradient directly from a curve of the energy supplied against time, and so step 25 to apply a medium motion filter can be omitted.
    In addition, it is not necessary to wait for several alloy cycles and apply a medium motion filter to generate a slight curve from which a gradient can be calculated. In this way, it may be possible to calculate an estimated temperature 30 early in the heating operation, and more quickly after a temperature drop, compared to the realizations in which a switching of the power supply is used. ~
    Additionally, the embodiments of the present invention
    22/22 have been described in which a temperature sensor is provided in the vicinity of a heating element in order to measure a temperature of the heating element. However, in other embodiments, the temperature sensor cannot directly measure the temperature of the heating element itself. For example, the temperature sensor can measure a temperature that is slightly less than a temperature of the heating element, when the temperature sensor is separated from the heating element by an air box. It is provided that the temperature is felt in a similar location during calibration and during normal use, such differences can be explained and cannot, on the contrary, affect the accuracy with which a temperature is estimated.
    In addition, although the embodiments of the present invention are described with respect to kitchen appliances, in other embodiments the heated material cannot be a food product. For example, an embodiment of the present invention may comprise a facial steam engine, in which the heated material comprises water. In general, the embodiments of the present invention can allow the temperature of any heated material to be estimated.
    The use of the verb understand and its conjugations does not exclude the presence of elements other than those indicated in a claim or description. The use of the indefinite article one or one before an element or step does not exclude the presence of a plurality of such elements or steps. Figures and description should be listed as illustrative only and do not limit the subject. Any reference mark in the claims should not be construed as limiting the scope.
    权利要求:
    Claims (5)
    [1]
    1. METHOD FOR ESTIMATING A TEMPERATURE OF A MATERIAL IN A CONTAINER BEING HEATED BY A HEATING ELEMENT, characterized by the method comprising:
    measuring a temperature in the vicinity of the heating element;
    controlling a variation of electricity supply to the heating element to maintain a predetermined dependence on electricity supply at the measured temperature;
    calculating a rate at which the electricity supplied varies over time;
    determining a parameter value of thermal inertia of the material being heated by comparing the calculated rate of change in energy supplied with a plurality of known rates to maintain said predetermined dependence on the measured temperature, said corresponding known rates with the respective known parameter values thermal inertia; and estimate the temperature of the material being heated based on the inclusion of data in the determined thermal inertia parameter value.
    [2]
    2. METHOD, according to claim 1, characterized by the variation in the supply of electricity to the heating element being controlled by repeatedly turning the electricity on and off
    provided to maintain the said dependency predetermined at measured temperature. 3. METHOD, according with the claim 2, characterized by understanding The application of a filter in
    average movement in the energy data representing the variation of the electricity supply and calculate an average rate at which the said electricity supply varies with the
    Petition 870190130489, of 12/09/2019, p. 8/15
    2/5 time.
    4. METHOD according to any one of claims 1 to 3, characterized in that the estimated temperature is calculated based on the equation where t is the estimated temperature, To is an initial temperature, Tf is the predefined temperature, t is a time elapsed since the start of heating, and B is the value of the thermal inertia parameter determined for the material being heated.
    METHOD according to any one of claims 1 to 4, characterized in that the temperature detected is representative of a temperature of at least one of:
    heating element, and an interface layer located between the heating element and the container.
    6. METHOD according to any one of claims 1 to 5, characterized in that the variation in the supply of electrical energy to the heating element is controlled to maintain a value of the detected temperature within a predetermined temperature range.
    METHOD, according to any one of claims 1 to 6, characterized in that it includes the detection of a drop in temperature of the material being heated, by means of detecting a change in the calculated rate at which the electricity supply varies with the time.
    8. METHOD, according to claim 7, characterized by including re-estimating the temperature of the material being heated, after detecting the temperature drop, based on the data representing the variation of the
    Petition 870190130489, of 12/09/2019, p. 9/15
    [3]
    3/5 electrical power supplied before and after the temperature drop.
    9. APPARATUS TO ESTIMATE A TEMPERATURE OF A
    MATERIAL (208; 1103) BEING HEATED IN A CONTAINER, characterized in that the appliance comprises:
    an element (202) arranged for heating the container;
    an energy supply (204) adapted to control electrical energy to the heating element;
    a temperature sensor (203) arranged to detect a temperature in the vicinity of the heating element;
    and a control unit (205) adapted for:
    receive the detected temperature;
    controlling the energy supply of the energy source to supply a variable source of electrical energy to the heating element to maintain a predetermined dependence on the energy supply at the detected temperature, calculating a rate at which the electrical energy supply varies with time;
    determining a thermal inertia parameter value for the material being heated by comparing the calculated rate of variation of the energy supply with a plurality of known rates to maintain said predetermined dependence on the detected temperature, said corresponding known rates with the respective parameter values known thermal inertia; and estimate the temperature of the material being heated based on data including the value of the determined thermal inertia parameter.
    10. APPLIANCE, according to claim 9,
    Petition 870190130489, of 12/09/2019, p. 10/15
    [4]
    4/5 characterized by understanding:
    a switching unit (209) coupled to the power supply and the heating element, said switching unit being switchable between an ON state in which electrical power is supplied to the heating element and an OFF state in which the electrical power is not it is supplied to the heating element, where the control unit is adapted to repeatedly switch the switching unit between the ON and OFF states to maintain the predetermined dependence on the detected temperature.
    11. APPLIANCE, according to claim 10, characterized in that the control unit is adapted to apply a medium motion filter to the energy data representing the variation of the electric power supply, and to calculate the average rate at which said power supply electrical energy varies with time.
    Apparatus according to any one of claims 9 to 11, characterized in that the temperature sensor is arranged in the vicinity of the heating element to detect a temperature of at least one:
    heating element; and interface layer (201) located between the heating element and the container.
    13. Apparatus according to any one of claims 9 to 12, characterized in that the control unit is adapted to control the variation of the electric energy supply to the heating element to maintain a value of the detected temperature within a predetermined temperature range.
    14. Apparatus according to any one of claims 9 to 13, characterized in that the control unit is adapted to detect a drop in temperature of the material being heated, by detecting a change
    Petition 870190130489, of 12/09/2019, p. 11/15
    [5]
    5/5 in the calculated rate at which the electricity supply varies over time.
    15. APPLIANCE, according to claim 14, characterized in that the control unit is adapted to re-estimate the temperature of the material being heated, after detecting the temperature drop, based on the data representing the variation of electrical energy supplied before and after the temperature drop.
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    同族专利:
    公开号 | 公开日
    JP5735639B2|2015-06-17|
    US9109960B2|2015-08-18|
    EP2388564A1|2011-11-23|
    EP2572173B1|2017-03-22|
    WO2011145063A1|2011-11-24|
    RU2012155193A|2014-06-27|
    RU2562917C2|2015-09-10|
    BR112012029140A2|2017-11-28|
    EP2572173A1|2013-03-27|
    CN102985799A|2013-03-20|
    US20130048625A1|2013-02-28|
    JP2013529305A|2013-07-18|
    CN102985799B|2014-12-10|
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    法律状态:
    2018-02-27| B25D| Requested change of name of applicant approved|Owner name: KONINKLIJKE PHILIPS N.V. (NL) |
    2018-03-13| B25G| Requested change of headquarter approved|Owner name: KONINKLIJKE PHILIPS N.V. (NL) |
    2018-12-26| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-09-10| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-03-17| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-05-26| 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 18/05/2011, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    EP10163440.0|2010-05-20|
    EP10163440A|EP2388564A1|2010-05-20|2010-05-20|Estimating temperature|
    PCT/IB2011/052176|WO2011145063A1|2010-05-20|2011-05-18|Estimating temperature|
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