• 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:
    SUMMARY The invention relates to a method in an HC dosing system for purifying exhaust gases from an engine (150), comprising a dosing unit (250) for supplying a fuel to an exhaust duct (240), comprising the step of determining (s340) dosing unit (250) is available. The method also comprises the step of, if an undesired temperature level of said undesired temperature level is determined to exist, removing (s360) fuel from said dosing unit (250) by supplying said fuel to said exhaust duct (240). The invention also relates to a computer program product comprising program code (P) for a computer (200; 210) for implementing a method according to the invention. The invention also relates to a device of an HC dosing system and a motor vehicle (100) which is equipped with the timing device. Figure 2 for publication
    公开号:SE1050652A1
    申请号:SE1050652
    申请日:2010-06-21
    公开日:2011-12-22
    发明作者:Andreas Liljestrand；Per Bremberg；Daniel Arvidsson
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    according to drivers stored in a control unit of the vehicle. In order to more easily regulate the pressure at small or no dosage amounts, the system also consists of a return hose which is arranged from a pressure side of the system back to the container. According to the cooling dosing unit by means of said diesel which on cooling flows from this configuration, it is possible to return the container via the pump and the dosing unit to the container. In this way an active cooling of the dosing unit is provided. The return flow from the dosing valve to the container is today substantially constant.
    During operation of the HC dosing system, thermal energy is stored in the exhaust system.
    This thermal energy can be transferred to e.g. the dosage unit.
    Since the dosing unit is currently arranged at the exhaust system of the vehicle, which exhaust system during operation of the vehicle is heated depending on e.g. load on the engine, the dosing unit risks overheating. Overheating of the dosing unit may result in degradation of the same consideration functionality, which may result in a degraded performance thereof.
    During certain operating cases, where a cooling flow for the dosing unit is insufficient, there is a risk that the dosing unit is functionally degraded, overheated and permanently damaged, or even completely breaks down. Even at temperatures that are not critical to the hardware of the HC dosing system, there is a risk that the fuel therein will be adversely affected by excessive temperatures.
    The dosing unit today comprises electrical components, some of which include a circuit board. Said circuit boards can e.g. be provided for controlling the dosing of diesel to the exhaust system of the vehicle. These electrical components are sensitive to high temperatures for several reasons. Excessive temperatures of the dosing unit can result in degradation of the electrical components, which can lead to costly repairs at a service workshop. Furthermore, diesel present in the dosing unit can at least partially change to solid form at too high temperatures, which can lead to clogging of the dosing unit. According to one example, said diesel in the dosing unit undergoes pyrolysis, said diesel being at least partially converted to coke. Thus, at least a part of said diesel can boil. the dosage unit of the DPF system does not exceed a critical temperature.
    It is therefore of utmost importance that the temperature of cooling of the dosing unit of a DPF system in vehicles today takes place continuously during ordinary operation of the vehicle as said diesel is circulated within the DPF system in the manner indicated above. To some extent, cooling of the dosing unit during operation of the vehicle today works satisfactorily.
    However, there is always a need to improve the performance of existing subsystems, DPF systems, competition point of view. for example in vehicles, not least seen from a When shutting down the vehicle and thus after shutting off exhaust flow in the exhaust system, the dosing unit for diesel is cooled by means of said diesel in the same way as during ordinary operation for a predetermined time, such as e.g. 30 minutes.
    WO 2009/020541 describes a system for discharging a reducing substance from an injection system. The system has a heater connected to an injector, where the purpose of the heater e.g. is to vaporize the substance from the injector to avoid blockages in the injection system. However, the heater is space consuming and its operation is associated with costs regarding development, installation, monitoring during operation and maintenance.
    WO 2008/006840 describes a system for storing and supplying an additive in an exhaust system.
    There is a need to improve the current HC dosing system to reduce or eliminate the above mentioned disadvantages.
    SUMMARY OF THE INVENTION An object of the present invention is to provide a new and advantageously improved HC dosing system. An object of the present invention is to provide a novel and improved HC dosing system, where a cooling flow of a dosing unit is lacking or is an advantageous method of performing an insufficient.
    Another object of the invention is to provide a new and advantageous device of an HC dosing system and a new and advantageous computer program for improving the performance of an HC dosing system.
    Another object of the invention is to provide a new and advantageous device of an HC dosing system and a new and advantageous computer program for improving the performance of an HC dosing system, where a cooling flow of a dosing unit is missing or insufficient.
    An object of the present invention is to provide a method in an HC dosing system, which method provides a reduced risk of HC clogging of undesired functional degradation of in and / or a component, e.g. a dosing unit, of the HC dosing system with components dosing system reduced risk with respect to a fuel.
    A further object of the invention is to provide an alternative method in an HC dosing system and an alternative computer program in one and an HC-HC dosing system alternative device of a dosing system.
    These objects are achieved by a method of HC dosing system for purifying exhaust gases from an engine, comprising a dosing unit for supplying a fuel to an exhaust duct, according to claim 1.
    According to one aspect of the invention there is provided a method of an HC metering system for purifying exhaust gases from an engine, comprising a metering unit for supplying a fuel to an exhaust duct, comprising a metering unit for supplying a fuel to an exhaust duct, comprising the step of determining whether an undesired temperature level of said dosage unit is present. The method also comprises the step of, if said undesired temperature level is determined to exist, removing fuel from said dosing unit by supplying said fuel to said exhaust duct.
    This reduces the risk of the fuel in the dosing unit boiling. Coking could otherwise lead to operational disruptions, such as e.g. error codes in control system.
    Coke of the fuel in the dosing unit could otherwise also cause a regeneration of the particulate filter to be adversely affected, since a smaller amount of fuel can be dosed, whereby a temperature of the exhaust system drops. In this case, it takes longer to carry out a desired regeneration of the particle filter. In this case, it also becomes more difficult to regulate a desired temperature of the exhaust system during regeneration.
    Said determination of whether said undesired temperature level is present can be performed after switching off an exhaust gas flow. In operating cases where the engine of the HC dosing system is switched off after operation with a high power output, an evacuation of heated fuel in the dosing unit can contribute to lowering an undesirably high temperature of the dosing unit.
    The method may comprise the step of continuously cooling said dosage unit by means of a waste of said fuel. By combining continuous cooling of the dosing unit by means of said fuel and dosing of heated fuel of the dosing unit into the exhaust duct, positive synergy effects are obtained, which lead to improved cooling of the dosing unit, especially after the engine of the HC dosing system has been switched off.
    The method may comprise the step of intermittently removing fuel from said dosing unit by supplying said fuel to said exhaust duct.
    By intermittently removing fuel, a heat transfer between the dosing unit and the fuel can be allowed under controlled conditions. In this way, an energy value of the fuel can be increased. At appropriate times, at least a portion of the heated fuel of the metering unit may be metered into the exhaust duct of the HC metering system.
    The amount of fuel removed should be so limited that a not too large amount of fuel is supplied to the exhaust duct, in particular after switching off an exhaust gas flow at the exhaust duct. At a start-up of the HC dosing system, the exhaust duct will be heated and help to vaporize the amount of fuel removed for use in a conventional manner.
    Said undesired temperature level may be within a predetermined range, e.g. within 80-130 degrees Celsius. Said undesired temperature level can be selected to a suitable value depending on the properties of the fuel in question.
    The method may comprise the step of continuously determining a prevailing temperature of the dosing unit, in order to continuously determine whether a reliable process is hereby provided in an HC dosing system, where an undesired temperature level of a dosing unit is present. calculations of the amount of fuel to be removed can be performed on relevant input data.
    The method may comprise the step of calculating an amount of fuel to be removed on the basis of a prevailing temperature of the dosing unit. In this case, an optimized amount of fuel can be removed from the dosing unit into the exhaust duct. The calculated amount of fuel can be dosed at a set appropriate time. The calculated amount of fuel can be dosed intermittently in a suitable manner.
    The method may comprise the step of removing a predetermined amount of fuel from said dosage unit. The predetermined amount of fuel may be substantially all of the available heated fuel of the dosage unit. This step has the advantage that a less computationally heavy variant is provided.
    The method may comprise the step of removing fuel from said dosing unit by means of existing pressurization of the fuel in the dosing unit. Said existing pressurization can be effected by a pump of the HC dosing system. According to an alternative embodiment, said fuel can be removed by means of a self-pressure of the HC dosing system.
    Said fuel may be diesel or other hydrocarbon-based fuel.
    According to one aspect of the invention, there is provided an apparatus of an HC metering system for purifying exhaust gases from an engine, comprising a metering unit for supplying a fuel to an exhaust duct, comprising means for determining whether an undesired temperature level of said metering unit is present, and means for that, if said undesired temperature level of said dosing unit is determined to exist, remove fuel from said dosing unit by supplying said fuel to said exhaust duct.
    Said determination of whether said undesired temperature level exists can be performed after shutting off an exhaust de fate.
    The device may comprise means for continuously cooling said dosing unit by means of a flow of said fuel.
    The device may comprise means for intermittently removing fuel from said dosing unit by supplying said fuel to said exhaust duct.
    The device may comprise means for continuously determining a prevailing temperature of a dosing unit, for continuously determining whether an undesired temperature level of a dosing unit is present.
    The device may comprise means for calculating an amount of fuel to be removed on the basis of a prevailing temperature of the dosing unit.
    The device may comprise means for removing a predetermined amount of fuel from said dosing unit.
    The device may comprise means for removing fuel from said dosing unit by means of existing pressurization of the fuel in the dosing unit.
    The feed device may include a feed device which is arranged to supply fuel to an injection system of an engine. In this case, an already existing feeding device of the vehicle can be used for a new purpose.
    Alternatively, a separate feeding device can be used.
    The above objects are also achieved with a motor vehicle incorporating the features of the device of an HC dosing system described herein.
    The motor vehicle can be a truck, bus or car.
    According to one aspect of the invention, there is provided a computer program of HC dosing system for purifying exhaust gases from an engine, comprising a dosing unit for supplying a fuel to an exhaust duct, said computer program comprising program code stored on a computer readable medium for causing an electronic control unit or another computer connected to the electronic control unit to perform the steps according to any one of claims 1-1 O.
    According to one aspect of the invention, there is provided a computer program product comprising a program code stored on a computer readable medium for performing the method steps of any of claims 1-10, when said computer program is run on an electronic control unit or another computer connected to the electronic control unit. .
    The procedure is easy to implement in existing motor vehicles. Software for HC dosing systems for exhaust gas purification according to the invention can be installed in a control unit of the vehicle during its manufacture. A buyer of the vehicle can thus be given the opportunity to choose the function of the procedure as an option.
    Alternatively, software comprising program code for performing the innovative process of HC exhaust system for purifying exhaust gases from an engine, including a metering unit for supplying a fuel to an exhaust duct, may be installed in a control unit of the vehicle when upgrading at a service station.
    In this case, the software can be loaded into a memory in the control unit. Implementing the innovative procedure is thus cost-effective, especially since no additional sensors or components need to be installed in the vehicle.
    The required hardware is already present in the vehicle today.
    The invention thus provides a cost-effective solution to the above problems.
    Software that includes program code in HC metering systems for purifying exhaust gases from an engine, including a metering unit for supplying a fuel to an exhaust duct, can be easily updated or replaced. Furthermore, different parts of the software comprising program code in HC dosing systems for purifying exhaust gases from an engine, including a dosing unit for supplying a fuel to an exhaust duct, can be replaced independently of each other. This modular configuration is advantageous from a maintenance perspective.
    Additional objects, advantages and novel features of the present invention will become apparent to those skilled in the art from the following details, as well as through the practice of the invention. While the invention is described below, it should be understood that the invention is not limited to the specific details described. Those skilled in the art having access to the teachings herein will recognize and incorporate within other further applications, modifications areas, which are within the scope of the invention. SUMMARY DESCRIPTION OF THE DRAWINGS For a more complete understanding of the present invention and further objects and advantages thereof, reference is now made to the following detailed description which is to be read in conjunction with the accompanying drawings in which like reference numerals refer to like parts in the various figures, and in which: 1 schematically illustrates a vehicle, according to an embodiment of the invention; Figure 2 schematically illustrates a subsystem of the vehicle shown in Figure 1, according to an embodiment of the invention; Figure 3a schematically illustrates a flow chart of a method, according to an embodiment of the invention; Figure 3b schematically illustrates in further detail a flow chart of a method, according to an embodiment of the invention; and illustrates a computer, Figure 4 schematically according to an embodiment of the invention.
    DETAILED DESCRIPTION OF THE FIGURES Referring to Figure 1, a side view of a vehicle 100 is shown. The exemplary vehicle 100 consists of a tractor 110 with an engine 150 and a trailer 112. The vehicle may be a heavy vehicle, such as a truck or a bus. The vehicle can alternatively be a car. It should be noted that the invention is suitable for use in any suitable HC dosing system and is not limited to DPF systems in motor vehicles. The innovative method and the innovative device according to an aspect of the invention are well suited for platforms which include an HC dosing system other than motor vehicles, such as e.g. watercraft. The watercraft can be of any suitable type, such as e.g. motorboats, ships, ferries or ships.
    The innovative method and the innovative device according to an aspect of the invention are also well suited for e.g. systems including industrial engines and / or motorized industrial robots.
    The innovation in an HC dosing system and the innovative device of a device according to an aspect of the invention are also well suited for different types of power plants, such as e.g. an electric power plant comprising a diesel generator.
    The innovation of an HC dosing system and the innovative device of a device are well suited for any suitable engine system which includes an engine and an HC dosing system, such as e.g. at a locomotive or other platform.
    The innovative method and device are well suited for any suitable system including a particulate generator (eg an internal combustion engine) and an HC dosing system.
    The innovative method and the innovative device are well suited for any suitable system which includes any suitable system which produces exhaust gases with particles and a filter which stores particles which are burned during a regeneration of said filter, in particular during an active regeneration of said filters. 12 Here, the term "link" refers to a communication link which may be a physical line, such as an optoelectronic communication line, or a non-physical line, such as a wireless connection, for example a radio or microwave link k.
    Here, the term "conduit" refers to a passage for holding and transporting a fluid, such as e.g. a fuel in liquid form. The conduit can be a pipe of any suitable dimension. The conduit may consist of any suitable material, such as e.g. plastic, rubber or metal.
    Herein, the term "fuel" refers to an agent used for the active regeneration of a particulate filter in an HC dosing system. Said fuel is according to one embodiment diesel. Of course, other types of hydrocarbon-based fuels can be used. Here, diesel is mentioned as an example of a fuel, but a person skilled in the art realizes that the innovative method and the innovative device can be realized for other types of fuels, with requirements such as e.g. adequate adjustments, adjustments to the boiling temperature of selected fuels, in control algorithms for executing software code in accordance with the innovative procedure. Although the term HC dosing system is used herein to indicate a particulate filter system, the invention is not limited to the use of a diesel particulate filter. On the contrary, other types of particle filters can be used according to the invention. One skilled in the art will recognize what kind of fuel is best suited for regenerating the selected particulate filter.
    Referring to Figure 2, a subsystem 299 of the vehicle 100 is shown.
    The subsystem 299 is arranged in the tractor 110. The subsystem 299 may form part of an HC dosing system. The subsystem 299 according to this example consists of a container 205 which is arranged to contain a fuel. The container 205 is arranged to contain a suitable amount of fuel and is further arranged to be able to be refilled if necessary. The container can hold e.g. 200 or 1500 liters of fuel.
    A first line 271 is arranged to lead the fuel to a pump 230 from the container 205. The pump 230 may be any suitable pump. The pump 230 may be a diaphragm pump comprising at least one filter. The pump 230 is arranged to be driven by means of an electric motor. The pump 230 is arranged to pump the fuel from the container 205 via the first line 271 and via a second line 272 supply said fuel to a dosing unit 250.
    The dosing unit 250 comprises an electrically controlled dosing valve, by means of which a flow of fuel added to the exhaust system can be controlled. The pump 230 is arranged to pressurize the fuel in the second line 272.
    The dosing unit 250 is provided with a throttling unit, against which said pressure of the fuel is built up in the subsystem 299.
    Dosing unit 250 is arranged to supply said fuel to a 100. Dosing unit 250 is arranged to supply in a controlled manner a suitable amount of exhaust system (not shown) to the vehicle. More specifically, fuel is to an exhaust system of the vehicle 100. According to this embodiment, a particulate filter (not shown), e.g. a DPF, arranged downstream of a position of the exhaust system where the supply of fuel is provided. The amount of fuel supplied to the exhaust system is intended to be used in a conventional manner in the HC dosing system for active regeneration of the particulate filter.
    The dosing unit 250 is arranged at e.g. an exhaust pipe arranged to direct exhaust gases from the internal combustion engine 150 of the vehicle 100 to said particulate filter. The dosing unit 250 is arranged in thermal contact with the exhaust system of the vehicle 100. This means that thermal energy is stored in e.g. an exhaust pipe, muffler, particulate filter and SCR catalyst can then be led to the dosing unit 250. The dosing unit 250 comprises an electronic control card, which is 200.
    The dosing unit 250 also comprises plastic and / or rubber components, arranged to handle communication with a control unit which may melt or be otherwise adversely affected at excessive temperatures.
    The dosing unit 250 is itself sensitive to temperatures above a certain 120 degree muffler and the particle filter of the vehicle 100 temperature value, such as e.g. Celsius. Since e.g. exhaust duct 240, exceeds this temperature value, there is a risk that the dosing unit may overheat during operation of the vehicle or after operation of the vehicle unless cooling thereof is effected.
    It should be noted that fuel present in the dosage unit 250 may be adversely affected at temperatures significantly lower than the 120 degrees Celsius indicated above. At temperatures exceeding e.g. 70 degrees Celsius, the fuel can become unstable, so that at slightly higher temperatures it may start to boil and in the long run possibly cause clogging of the dosing unit 250.
    A third conduit 273 is provided between the metering unit 250 and the container 205. The third conduit 273 is arranged to return a certain amount of the fuel supplied to the metering valve 250 to the container 205. With this configuration advantageous cooling of the metering unit 250 is provided. The dosing unit 250 is cooled by means of a flow of the fuel as it is pumped through the dosing unit 250 from the pump 230 to the container 205. Cooling of the dosing unit, by means of a return flow of the third line, can also be used after the vehicle has been switched off and the exhaust flow has ceased. If this cooling proves to be insufficient for the dosing unit 250, the evacuation innovative method can be used to advantage, including the step of at least a part of the fuel heated in the dosing unit 250 to the exhaust duct 240.
    A first control unit 200 is arranged for communication with a first temperature sensor 220 via a link 221. The first temperature sensor 220 is arranged to detect a prevailing temperature of the dosing unit 250.
    The first temperature sensor 220 is arranged to continuously send signals to the first control unit 200 including information about a prevailing first temperature T1 of the dosing unit 250.
    The first control unit 200 is arranged for communication with the pump 230 via a link 231. The first control unit 200 is arranged to control operation of the pump 230 in order to e.g. regulate the flows of fuel within the subsystem 299.
    The first control unit 200 is arranged to control an operating power of the pump 230 by controlling the electric motor thereby.
    The first control unit 200 is arranged for communication with a second temperature sensor 280 via a link 281. The second temperature sensor 280 is arranged to detect a prevailing temperature T2 of the exhaust duct 240.
    The second temperature sensor 280 is arranged to continuously send signals to the first control unit 200 including information about the prevailing temperature T2 of the exhaust duct 240.
    The first control unit 200 is arranged to calculate a prevailing temperature of the dosing unit 250 on the basis of the signals received from the second temperature sensor 280.
    The first control unit 200 is arranged for communication with the dosing unit 250 via a link 251. The first control unit 200 is arranged to control operation of the dosing unit 250 in order to e.g. regulating the supply of fuel to the exhaust system of the vehicle 100. According to one example, the first control unit 200 is arranged to control operation of the dosing unit 250 in order to e.g. regulate the re-supply of fuel to the tank 205.
    According to one embodiment, the first control unit 200 is arranged that, on the basis of the signals received from the first temperature sensor 220 and / or the second temperature sensor 280, if necessary, i.e. if there is an undesired temperature level of said dosing unit, remove fuel from said dosing unit by supplying said fuel to said exhaust duct, in accordance with an aspect of the innovative process.
    In particular, according to an embodiment, the first control unit 200 is arranged to, on the basis of the signals received from the first temperature sensor 220 and / or the second temperature sensor 280, calculate, if necessary, an amount of fuel to be removed on the basis of a prevailing temperature of the dosing unit. in accordance with one aspect of the innovative process.
    A second control unit 210 is arranged for communication with the first control unit 200 via a link 201. The second control unit 210 may be detachably connected to the first control unit 200. The second control unit 210 may be a control unit external to the vehicle 100. The second control unit 210 may be arranged to perform the innovative method steps according to the invention. The second control unit 210 can be used to upload software to the first control unit 200, in particular software for performing the innovative method. The second control unit 210 may alternatively be arranged for communication with the first control unit 200 via an internal network in the vehicle. The second control unit 210 may be arranged to perform substantially similar functions as the first control unit 200, such as e.g. determining whether an undesired temperature level of the dosing unit 250 is present, and if said undesired temperature level is present, dosing an appropriate amount of fuel of the dosing unit into the exhaust duct 240. The innovative procedure may be performed by the first control unit 200 or the second control unit 210, or by both the first control unit 200 and the second control unit 210.
    According to this embodiment, a source of compressed air 260 is arranged to supply pressurized air to the dosing unit 250 via a line 261. The dosing unit 250 is arranged to use said supplied pressurized air to further atomize the fuel being dosed. The compressed air can also be used to at least partially drive the dosing unit to dose said fuel into the exhaust duct. The compressed air can also be used to, where applicable, blow out e.g. the dosage unit 250 with respect to fuel contained therein. This can be done during operation of the motor 150, or after the motor 150 has been switched off.
    According to one embodiment, the container 205 may be the vehicle's fuel tank, with parts of the vehicle's existing fuel system being used in accordance with the present invention. According to another example, the container may be a separate container, i.e. not the same container as the vehicle's fuel tank.
    According to one embodiment, the exhaust duct is 240 of the HC dosing system. According to another example, the dosing unit 250 is arranged directly at the dosing unit 250 provided with a passive nozzle presently arranged through said exhaust duct 240 for dosing said fuel directly into the exhaust duct.
    According to one embodiment, said pump 230 is the same pump that normally generates fuel pressure for an injection system of the engine 150. According to another example, said pump 230 is a separate pump, i.e. not the same pump that normally generates the fuel pressure to the injection system.
    According to one example, a precatalyst and / or oxidation catalyst is mounted in series with the particulate filter. In this case, said precatalyst and / or oxidation catalyst are arranged upstream of said particle filter. Figure 3a schematically illustrates a flow chart of a process in an HC dosing system for purifying exhaust gases from an engine, comprising a dosing unit for supplying a fuel to an exhaust duct, according to an embodiment of the invention. The method comprises a first method step s301. Step s301 includes the steps of determining whether an undesired temperature level of said dosage unit is present, and if said undesired temperature level is determined to exist, removing fuel from said dosage unit by supplying said fuel to said exhaust duct. After step s301, the process is terminated.
    Figure 3b schematically illustrates a flow chart of a process in an HC metering system for purifying exhaust gases from the engine 150, comprising the metering unit 250 for supplying a fuel to the exhaust duct 240, according to an embodiment of the invention.
    The method includes a first method step s310. The process step s310 includes the step of determining a prevailing temperature of the dosing unit 250. This is done by directly measuring the prevailing temperature at the dosing unit 250. In process step s310, a first temperature value T1 representing a prevailing temperature of the dosing unit 250 is measured.
    Method step S320 includes the step of determining an estimated prevailing temperature of the dosing unit 250 indirectly. This is done by measuring the temperature at a component other than the dosing unit 250 of s310 temperature value T2 of a component other than the dosing unit 250.
    HC dosing system. In process steps, a second means is measured. By means of the measured temperature T2, a first estimated prevailing temperature T1est of the dosing unit 250 can be determined. According to an alternative, a second estimated prevailing temperature T2est of the dosing unit 250 can be determined (calculated) by means of a calculation model having 19 parameters other than the temperature of a component of the HC dosing system as input value. Such an input parameter can e.g. be a prevailing load of the motor 150. It should be noted that steps s310 and s320 can be performed substantially simultaneously, or in reverse order. It should also be pointed out that according to one embodiment it is possible to use only the measured temperature T1 of the dosing unit 250 to determine a maximum temperature value Tmax as below. In some cases it is advantageous to use both the measured temperature T1 and at least one of the estimated prevailing temperatures T1est and T2est to determine a maximum temperature value Tmax as below as a more robust process is thereby obtained.
    After the process step s320, a subsequent process step s330 is performed.
    Process step s330 includes the step of comparing the determined first temperature T1 and at least one of the estimated prevailing temperatures T1est and T2est of the dosing unit 250. After the process step s330, a subsequent process step s340 is performed.
    The process step s340 comprises the step of selecting the highest value of the values on the basis of a result of said comparison between the determined first temperature T1 and at least one of the estimated prevailing temperatures T1est and T2est. This highest temperature value is also called Tmax.
    Method step s340 also includes the step of determining whether an undesired temperature level of the dosing unit is present, where the dosing unit 250 is arranged to supply fuel to an exhaust duct.
    This can be done by a comparison with a limit value Tth, such as a predetermined temperature value, e.g. 70 or 100 degrees Celsius, depending on the type of fuel used in the HC dosing system. If Tmax is greater than or equal to Tth, it can be determined that an undesired temperature level of the dosage unit is present. If Tmax is less than Tth, it can be determined that an undesired temperature level of the dosage unit does not exist. After the process step s340, a subsequent process step s350 is performed.
    According to an alternative embodiment, as described above, it can be determined whether an undesired temperature level of the dosing unit 250 exists on the basis of only the measured temperature T1 of the dosing unit. According to this embodiment, a less complex method is provided, according to an aspect of the invention.
    The method step s350 includes the step of, on the basis of the selected value Tmax, calculating an amount of fuel to be removed from the dosing unit 250. This can be performed by means of stored calculation models. In this case, a suitable dosage configuration can be determined, e.g. regarding the amount of fuel to be removed at After the process step s350, a subsequent process step s360 is performed. respectively different times.
    The process step s360 comprises the step of, on the basis of the selected value Tmax, taking a measure for influencing the temperature of the dosing unit 250. In this case, a fixed amount of fuel is removed at a suitable time.
    It appears here that a number of different amounts of fuel can be dispensed at the respective fixed time. After s360, the procedure ends. the process step With reference to Figure 4, a diagram of an embodiment of a device 400 is shown. The control units 200 and 210 described with reference to Figure 2 may in one embodiment comprise the device 400. The device 400 comprises a non-volatile memory 420, a data processing unit 410 and a read / write memory 450. The non-volatile memory 420 has a first memory portion 430 in which a computer program, such as an operating system, is stored to control the operation of the device 200. Further, the device 400 includes a bus controller, a serial communication port, I / O means, an A / D converter, a time and date input and transfer unit, an event counter and an interrupt controller (not shown). The non-volatile memory 420 also has a second memory portion 440. A computer program P is provided which includes routines for determining 250.
    The program P comprises routines for removing, if said undesired temperature level whether an undesired temperature level of the dosing unit is present, fuel from said dosing unit by supplying said fuel to said exhaust duct, according to an aspect of the innovative method. The program P includes routines for continuously determining a prevailing temperature of the dosing unit, for continuously determining whether an undesired temperature level of a dosing unit is present.
    The program P includes routines for calculating an amount of fuel to be removed on the basis of a prevailing temperature of the dosing unit.
    The program P includes routines for continuously cooling the dosing unit 250 by means of a flow of said fuel.
    The program P comprises routines for intermittently removing fuel from said dosing unit by supplying said fuel to said exhaust duct.
    The program P can be stored in an executable manner or in a compressed manner in a memory 460 and / or in a read / write memory 450.
    When it is described that the data processing unit 410 performs a certain function, it is to be understood that the data processing unit 410 performs a certain part of the program which is stored in the memory 460, or a certain part of the program which is stored in the read / write memory 450.
    The data processing device 410 may communicate with a data port 499 via a data bus 415. The non-volatile memory 420 is intended for communication with the data processing unit 410 via a data bus 412. The separate memory 460 is intended to communicate with the data processing unit 410 via a data bus 411. the data processing unit 410 via a data bus 414. To the data port 499, e.g. links 201, 221, 231, 251 and 281 are connected (see Figure 2).
    The read / write memory 450 is arranged to communicate with 22. When data is received on the data port 499, it is temporarily stored in the second memory part 440. When the received input data has been temporarily stored, the data processing unit 410 is prepared to perform code execution in a manner described above. According to one embodiment, signals received at the data port 499 include information about a first measured temperature T1 of the dosing unit 250. According to one embodiment, signals received at the data port 499 include information about a second measured temperature T2 of a component of the HC dosing system in addition to the dosing unit 250. The received signals at the data port 499 can be used by the device 400 to, where applicable, remove fuel from the metering unit 250 of the HC metering system.
    Parts of the methods described herein may be performed by the device 400 by means of the data processing unit 410 running the program stored in the memory 460 or the read / write memory 450. When the device 400 runs the program, the methods described herein are executed.
    The foregoing description of the preferred embodiments of the present invention has been provided for the purpose of illustrating and describing the invention. It is not intended to be exhaustive or to limit the invention to the variations described. Obviously, many modifications and variations will occur to those skilled in the art. The embodiments were selected and described to best explain the principles of the invention and its practical applications, thereby enabling those skilled in the art to understand the invention for various embodiments and with the various modifications appropriate to the intended use.
    权利要求:
    Claims (23)
    [1]
    A method of an HC metering system for purifying exhaust gases from an engine (150), comprising a metering unit (250) for supplying a fuel to an exhaust duct (240), comprising the step of: - determining (s340) whether an undesired temperature level in said dosing unit (250), characterized by the step of: - if said undesired temperature level is determined to exist, remove (s360) fuel from said dosing unit (250) by supplying said fuel to said exhaust duct (240).
    [2]
    A method according to claim 1, wherein said determining whether said undesired temperature level exists is performed after shutting off an exhaust gas fl.
    [3]
    A method according to claim 1 or 2, comprising the step of continuously cooling said dosage unit (250) by means of a flow of said fuel.
    [4]
    A method according to any one of claims 1-3, comprising the step of intermittently removing (s360) fuel from said dosing unit (250) by supplying said fuel to said exhaust duct (240).
    [5]
    A method according to any one of the preceding claims, wherein said undesired temperature level is within a predetermined range, e.g. within 80-130 degrees Celsius.
    [6]
    A method according to any one of the preceding claims, comprising the step of: - continuously determining a prevailing temperature of the dosing unit (250), to continuously determine whether an undesired temperature level of the dosing unit (250) is present. 10 15 20 25 30 24
    [7]
    A method according to any one of the preceding claims, comprising the step of: - calculating (s350) an amount of fuel to be removed on the basis of a prevailing temperature of the dosing unit (250).
    [8]
    A method according to any one of the preceding claims, comprising the step of: - removing (s360) a predetermined amount of fuel from said dosing unit (250) to said exhaust duct.
    [9]
    A method according to any one of the preceding claims, comprising the step of: - removing (s360) fuel from said dosing unit by means of existing pressurization of the fuel in the dosing unit (250).
    [10]
    A method according to any one of the preceding claims, wherein said fuel is diesel or other hydrocarbon-based fuel.
    [11]
    An apparatus of an HC metering system for purifying exhaust gases from an engine (150), comprising a metering unit (250) for supplying a fuel to an exhaust duct (240), comprising: - means (200; 210; 400) for determining whether there is an undesired temperature level of said dosing unit (250), characterized by: means (200; 210; 400) for removing said fuel from said dosing unit (250) if said undesired temperature level of said dosing unit (250) is present by to supply said fuel to said exhaust duct (240).
    [12]
    The device of claim 11, wherein said determining whether said undesired temperature level is present is performed after shutting off an exhaust fl fate.
    [13]
    An apparatus according to claim 11 or 12, comprising: means (230) for continuously cooling said dosage unit (250) by means of a flow of said fuel.
    [14]
    Device according to any one of claims 11-13, comprising: - means (200; 210; 400) for intermittently removing fuel from said dosing unit (250) by supplying said fuel to said exhaust duct (240). 11-14, where the temperature level is within a predetermined range, e.g. within 80-130 degrees
    [15]
    Device according to any one of claims undesired Celsius.
    [16]
    Device according to any one of claims 11-15, comprising: - means (200; 210; 400) for continuously determining a prevailing temperature of the dosing unit (250), for continuously determining the presence of an undesired temperature level of the dosing unit (250).
    [17]
    Device according to any one of claims 11-16, comprising: - means (200; 210; 400) for calculating an amount of fuel to be removed on the basis of a prevailing temperature of the dosing unit (250).
    [18]
    Device according to any one of claims 11-17, comprising: - means (200; 210; 400) for removing a predetermined amount of fuel from said dosing unit (250).
    [19]
    Device according to any one of claims 11-18, comprising: - means (200; 210; 400) for removing fuel from said dosing unit by means of existing pressurization of the fuel in the dosing unit (250).
    [20]
    Motor vehicle (100; 110) comprising a device according to any one of claims 11-19. 10 15 26
    [21]
    A motor vehicle (100; 110) according to claim 20, wherein the motor vehicle is something of a truck, bus or passenger car.
    [22]
    A computer program (P) in an HC metering system for purifying exhaust gases from an engine (150), comprising a metering unit (250) for supplying a fuel to an exhaust duct (240), said computer program (P) comprising program code stored on a , a computer readable medium for causing an electronic control unit (200; 400) or another computer (210; 400) connected to the electronic control unit (200; 400) to perform the steps according to any one of claims 1-10.
    [23]
    A computer program product comprising a program code stored on a computer readable medium for performing the method steps of any of claims 1-10, when said computer program is run on an electronic control unit (200; 400) or another computer (210; 400) connected to it (200; 400). electronic control unit
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    同族专利:
    公开号 | 公开日
    EP2582936A1|2013-04-24|
    SE536316C2|2013-08-20|
    CN103003538A|2013-03-27|
    US20130111885A1|2013-05-09|
    EP2582936A4|2014-12-17|
    BR112012032552A2|2016-11-22|
    WO2011162698A1|2011-12-29|
    JP2013534990A|2013-09-09|
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    法律状态:
    2018-01-30| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    SE1050652A|SE536316C2|2010-06-21|2010-06-21|Method and apparatus for removing fuel from a metering unit of an HC metering system|SE1050652A| SE536316C2|2010-06-21|2010-06-21|Method and apparatus for removing fuel from a metering unit of an HC metering system|
    EP11798468.2A| EP2582936A4|2010-06-21|2011-06-20|Method pertaining to hc dosing systems and device of hc dosing systems|
    BR112012032552A| BR112012032552A2|2010-06-21|2011-06-20|"method relating to hc dosing systems and device of hc dosing systems"|
    CN2011800355605A| CN103003538A|2010-06-21|2011-06-20|Method pertaining to hc dosing systems and device of hc dosing systems|
    JP2013516540A| JP2013534990A|2010-06-21|2011-06-20|Method related to HC charging system and apparatus of HC charging system|
    PCT/SE2011/050796| WO2011162698A1|2010-06-21|2011-06-20|Method pertaining to hc dosing systems and device of hc dosing systems|
    US13/805,127| US20130111885A1|2010-06-21|2011-06-20|Method pertaining to hc dosing systems and device of hc dosing systems|
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