• 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:
    The invention relates to a method pertaining to an SCR system for exhaust cleaning which comprises a container (205), to accommodate a reducing agent, and a dosing unit (250). The method comprises the steps of - continuously detecting (S410) discrete indications for remaining volumes of reducing agent in said container, - setting (S420) a first value (V1-VN) for said remaining volumes to latest detected indications for remaining volumes of reducing agent, and - setting (S430) second value (V1-VN) for said remaining volumes to latest detected indications for remaining volumes of reducing agent, for determination of a detected reducing agent volume dosed (Vdetect). The invention relates also to a computer programme product containing programme code (P) for a computer (200; 210) for implementing a method according to the invention. The invention relates also to an SCR system and a motor vehicle (100; 110) equipped with the SCR system.
    公开号:SE1150342A1
    申请号:SE1150342
    申请日:2011-04-19
    公开日:2012-10-20
    发明作者:Erik Gustafsson；Lars Eriksson
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    In order to be able to meet the increasingly stringent emission requirements with regard to NOX, it is becoming increasingly common for vehicle manufacturers to equip their new vehicles with SCR systems, e.g. of the kind described above. It is further desirable to be able to diagnose whether the SCR system of a vehicle dispenses the right amount of reducing agent. One way of diagnosing too low a consumption of reducing agents, which in itself leads to undesirable emission emissions, is to compare how much a volume of reducing agent carried in the container has decreased with the calculated dosed volume of reducing agent. However, the method used today is disadvantageous in a number of different ways.
    In one type of SCR system, level sensors are used with a float sensor, where the level sensor is arranged vertically in the container for reducing agents. This float sensor is arranged to emit discrete signals, ie the read levels consist only of certain predetermined levels, at which so-called switches are located. The switches are arranged to emit said discrete signals when a level of the reducing agent passes the level where the switch is mounted. If the actual level of the reducing agent is in the container between two switches, the read level will often be the lower of the levels for each switch. This creates problems in diagnosing the SCR system, in particular where so-called consumption tests need to be performed to determine whether a calculated detected volume reduction of the reductant in the container. Due to the fact that the level sensor dosed amount of reductant corresponds to one only determines discrete volume indications, with today's consumption test an excessive error with regard to the detected volume reduction of the container is inherent.
    There is thus a need to improve current methods for performing consumption tests on SCR systems, in particular as increasing demands are made, e.g. legal requirements, on motor vehicles equipped with SCR systems for exhaust gas purification.
    US2005251318 and US2010086446 disclose methods for diagnosing urea solution delivery in SCR systems by measuring a fluid level and amount of urea solution consumed.
    SUMMARY OF THE INVENTION An object of the present invention is to provide a new and advantageous method for improving the performance of an SCR system.
    Another object of the invention is to provide a new and advantageous SCR system and a new and advantageous computer program for improving the performance of an SCR system.
    An object of the present invention is to provide a new and advantageous method for a consumption test of an SCR system.
    Another object of the invention is to provide a new and advantageous computer program for a consumption test of an SCR system.
    A further object of the invention is to provide a method, an SCR system and a computer program for providing increased accuracy in a consumption test of an SCR system.
    A further object of the invention is to provide an alternative method, an alternative SCR system and an alternative computer program for a consumption test of an SCR system.
    These objects are achieved by a method according to claim 1.
    According to one aspect of the invention, there is provided a method of an SCR system for exhaust gas purification comprising a container for containing a reducing agent and a dosing unit, comprising the steps of: - continuously detecting discrete indications of residual volume of reducing agent in said container; - determining a first value for said residual volume to the last detected indication for the remaining volume of reducing agent, and - determining a second value for said remaining volume to the last detected indication for the remaining volume of reducing agent, for determining a detected dosed volume reducing agent.
    According to one aspect of the invention, information about an actual remaining residual volume of reducing agent is saved when a level of the reducing agent of a first switch is just passed, a setting being made to a lower discrete value, and a calculated volume corresponding to this level, via the dosing unit. reducing agents. According to the invention, information about an actual remaining volume of reducing agent is saved when a level of the reducing agent of a second switch is just passed, a setting being made to a lower discrete value, and a calculated volume of reducing agent corresponding to this level, via the dosing unit. In this case, a synchronized consumption test according to the invention can be achieved. By determining said first value and said second value to the respective last detected indication for the remaining volume of reducing agent, a higher consumption test said to be accurate can be achieved.
    According to one example, the location of all switches of a measuring device, such as e.g. a float sensor, which is placed in the container for the reducing agent in an electronic control unit which is arranged to control the SCR system. In this case, a respective remaining volume of reducing agent is known. next residual volume of reducing agent in a consumption test corresponding to these locations. Instead of using one in an SCR system, as is the case today, said first value and said second value are determined according to the present invention to the respective last detected indication for remaining volume reducing agent. On the basis of the detection of two arbitrary suitable switches (corresponding to predetermined volumes of residual reducing agent in the container) and the calculated volume of reducing agent dosed via the dosing unit, a more accurate consumption test for an SCR system can be achieved. This can be done by comparing a calculated volume of reducing agent dosed via the dosing unit with a detected dosed volume of reducing agent, which detected volume can be determined on the basis of a level difference between the last two determined discrete volume indications indicated by the float sensor before the level of the reductant. in the container just below these and set to the subsequent and discrete volume indications, respectively.
    According to the invention, the positive effect is achieved that the probability of measurement errors and the risk of false alarms if too low consumption of the reducing agent in the SCR system is reduced. Furthermore, a greater opportunity is advantageously provided to handle temporary changes in the detected level of reducing agent in the container, which may be due to the vehicle being driven on a long hill.
    A further advantage is that an improved feedback with regard to the actual volume of reducing agent consumed by the SCR system to a driver of the vehicle can be achieved.
    Said discrete volume indications can be predetermined depending on, among other things, container configuration. By considering the configuration of the container when the respective switches are associated with a discrete volume indication, a large number of container configurations and thus applications of the present invention are obtained. particularly flexible solution that can be adapted to a The invention is here an attractive solution for different stakeholders, such as different vehicle manufacturers with unique container configurations.
    The method may further comprise the step of determining said first value at any suitable discrete indication for the remaining volume of reducing agent.
    The method may include the step of determining said first value at a predetermined discrete indication of residual volume of reducing agent, when a level of the reducing agent is below a level of a predetermined switch of a certain value for a certain time.
    The method may further comprise the step of determining said second value at any suitable discrete indication for the remaining volume of reducing agent.
    The method may include the step of determining said second value at a predetermined discrete indication of residual volume of reducing agent, when a level of the reducing agent is below a level of a predetermined switch of a certain value for a certain time.
    The method may further comprise the step of determining said first value and said second value with a predetermined number of intermediate discrete indications for the remaining volume of reducing agent. This provides a versatile method according to the invention.
    Said first value and said second value can be determined to correspond to a predetermined volume difference.
    The method may further comprise the step of calculating a volume of reducing agent dosed via said dosing unit for a period of time determined by the times for determining said first value and said second value, respectively. In this case, a reference value is provided in a robust manner, which reference value can be used according to a consumption test for an SCR system.
    The method may further comprise the step of comparing said detected dosed volume reducing agent and said calculated dosed volume reducing agent in a consumption test. This provides a simple and reliable way to perform a consumption test for an SCR system.
    Said reducing agent may be a fluid solution comprising urea, such as e.g. AdBlue. There are a number of different suitable reducing agents which may be suitable for applications according to the invention.
    The procedure is easy to implement in existing motor vehicles. Software in an SCR system for exhaust gas purification comprising a container for containing a reducing agent and a dosing unit according to the invention can be installed in a control unit of the vehicle in the manufacture thereof. A buyer of the vehicle can thus be given the opportunity to choose the function of the procedure as an option.
    Alternatively, software including program code for performing the innovative procedure of an SCR exhaust purification system 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. Implementation of the innovative procedure is thus cost-effective, especially since no additional components or subsystems 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 an SCR system for exhaust gas cleaning including a container for containing a reducing agent and a dosage unit can be easily updated or replaced. Furthermore, different parts of the software that include program code to perform the innovative procedure can be replaced independently. This modular configuration is advantageous from a maintenance perspective.
    According to one aspect of the invention, there is provided an SCR system for exhaust gas purification comprising a container for containing a reducing agent and a dosing unit, comprising: means for continuously detecting discrete indications of residual volume of reducing agent in said container; means for determining a first value for said residual volume to the last detected indication for the remaining volume of reducing agent, and - means for determining a second value for said remaining volume for the last detected indication for the remaining volume of reducing agent, for determining a detected dosed volume (Vdetect) reducing agent.
    The SCR system may further comprise: - means for determining said first value at any suitable discrete indication for the remaining volume of reducing agent.
    The SCR system may further comprise: - means for determining said second value at any suitable discrete indication for the remaining volume of reducing agent.
    The SCR system may further comprise: - means for determining said first value and said second value with a predetermined number of intermediate discrete indications for the remaining volume of reducing agent.
    Said first value and said second value can be determined to correspond to a predetermined volume difference.
    The SCR system may further comprise: - means for calculating a volume of reducing agent dosed via said dosing unit for a period of time determined by the times of predetermining said first value and said second value, respectively.
    The SCR system may further comprise: - means for comparing said detected dosed volume reducing agent calculated dosing reducing agent in one and said volume consumption test.
    The above objects are also achieved with a motor vehicle that includes the SCR system. The motor vehicle can be a truck, bus or car.
    According to one aspect of the invention, there is provided any platform comprising an SCR system in accordance with the teachings herein, such as e.g. a watercraft. The watercraft can be of any kind, such as e.g. a motorboat, a ship, a ferry or a ship.
    According to one aspect of the invention, there is provided a computer program in an SCR system for exhaust gas purification comprising a container for containing a reducing agent and a dosing unit, said computer program comprising program code stored on a computer readable medium for causing an electronic control unit or a another computer connected to the electronic control unit to perform the steps according to any one of claims 1-7.
    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 1-7, when said computer program is run on an electronic control unit or another computer connected to the electronic control unit. . Advantages of the invention will become apparent to those skilled in the art from the following details, as well as additional objects, and novel features of the present invention 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 3 schematically illustrates a measuring device of a container, according to an embodiment of the invention; Figure 4a schematically illustrates a flow chart of a method, according to an embodiment of the invention; Figure 4b schematically illustrates in further detail a flow chart of a method, according to an embodiment of the invention; and illustrating a computer, Figure 5 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 and a trailer 112.
    The vehicle can 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 application to any SCR system and is thus not limited to SCR systems of motor vehicles. The innovative method and the innovative device according to an aspect of the invention are well suited for platforms which include an SCR system other than motor vehicles, such as e.g. watercraft.
    The watercraft can be of any kind, 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 innovative method and the innovative 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 innovative method and the innovative device are well suited for an arbitrary motor system which includes a motor and an SCR system, such as e.g. at a locomotive or other platform.
    The innovative method and device are well suited for an arbitrary system that includes a NOX generator and an SCR system.
    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 "lead" refers to a passage for holding and transporting a fl uid, such as e.g. a reductant in liquid form. The pipe can be a pipe of any dimension. The conduit may consist of any suitable material, such as e.g. plastic, rubber or metal.
    Here, the terms "reductant" or "reducing agent" refer to an agent used to react with certain emissions in an SCR system. These "reductant" "reducing agents" are used synonymously herein. Said reductant is according to an emissions can e.g. be NOx gas. The terms and execution so-called AdBlue. Of course, other types of reductants can be used.
    Here, AdBlue is mentioned as an example of a reductant, but a person skilled in the art realizes 12 that the innovative method and the innovative device can be realized for other types of reductants, with necessary adaptations, such as e.g. a ratio between the volume of reductant and the corresponding amount of reductant, in control algorithms for executing software code in accordance with the innovative procedure.
    Here, the terms "volume" and "amount" of reducing agent are used synonymously, based on the fact that an amount of reducing agent is the product of the volume and concentration of a particular reducing agent. It is also considered a fact that a certain volume of reducing agent in a container may be associated with a certain level, or a level difference, in a reducing agent container if the configuration of the container is known per se.
    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 SCR system. According to this example, the subsystem 299 consists of a container 205 which is arranged to hold a reductant. The container 205 is arranged to contain a suitable amount of reductant and is further arranged to be able to be refilled if necessary. The container can hold e.g. 75 or 50 liters of reductant.
    A first conduit 271 is provided to direct the reductant 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 may be arranged to be operated by means of an electric motor. The pump 230 is arranged to pump up the reductant from the container 205 via the first line 271 and via a second line 272 supply said reductant to a dosing unit 250. The dosing unit 250 comprises an electrically controlled dosing valve, by means of which a flow of reductant added to the exhaust system can be controlled. The pump 230 is arranged to pressurize the reductant in the second line 272. The dosing unit 250 is arranged with a throttling unit, against which said pressure of the reductant is built up in the subsystem 299. The dosing unit 250 is arranged to supply said reductant to a 100. dosing unit 250 arranged to in a controlled manner supply a suitable amount of exhaust system (not shown) to the vehicle More specifically, reductant is to an exhaust system of the vehicle 100. According to this embodiment, an SCR catalyst (not shown) is arranged downstream of a position of the exhaust system where supply of the reductant is provided. The amount of reductant supplied to the exhaust system is intended to be used in a conventional manner in the SCR catalyst to reduce the amount of unwanted emissions in a known manner.
    The dosing unit 250 is arranged at e.g. an exhaust pipe arranged to direct exhaust gases from an internal combustion engine (not shown) of the vehicle 100 to the SCR catalyst.
    A third conduit 273 is provided between the metering unit 250 and the container 205. For cooling purposes, the third conduit 273 is arranged to return a certain amount of the reductant fed to the metering valve 250 to the container 205.
    A first control unit 200 is arranged for communication with a measuring device 220 via a link 293. The measuring device 220 is arranged to detect a prevailing volume of reductant in the container 205. The measuring device 220 is arranged to detect a prevailing volume of reductant in the container 205 as discrete volume indications. According to this embodiment, the measuring device 220 is configured as a float sensor, which can be constituted by one or more vertically arranged elongate elements. The measuring device 220 is arranged to continuously detect a remaining volume of reducing agent in the container 205 and continuously send signals including information thereon to the first control unit 200. The measuring device 220 is described in further detail with reference to Figure 3a below. The first control unit 200 is arranged for communication with the pump 230 via a link 292. The first control unit 200 is arranged to control operation of the pump 230 in order to e.g. regulate flows of the reductant within the subsystem 299.
    The first control unit 200 is arranged for communication with the dosing unit 250 via a link 291. The first control unit 200 is arranged to control operation of the dosing unit 250 in order to e.g. regulating the supply of the reductant to the exhaust system of the vehicle 100. The first control unit 200 is arranged to control the operation of the dosing unit 250.
    According to one embodiment, the first control unit 200 is arranged to continuously determine the remaining volume of reducing agent in the form of discrete This measuring device 220. The first control unit 200 is arranged to continuously indicate volume. takes place on the basis of signals received by calculating a volume of reducing agent dosed via the dosing unit 250. This can be done by means of existing dosing configuration in such a way that a supply pressure of the dosing unit 250 is determined, whereby an opening time of the dosing unit 250 is determined to thereby determine a mass flow. The first control unit 200 is arranged to continuously determine the accumulated dosed volume of reducing agent. By continuously saving these calculated values, a calculated volume of reducing agent dosed via the dosing unit 250 can be determined between two suitable suitable times, which are preferably defined by the start point and the end point, respectively, for a consumption test. According to one aspect of the invention, a first time (start point) and a second time (end point) correspond to the times defined by determining the first and second values, respectively, of the remaining volume of reducing agent in the container 205.
    A second control unit 210 is arranged for communication with the first control unit 200 via a link 290. 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. to continuously determine the remaining volume of reducing agent in the form of discrete volume indications and to continuously determine by means of existing dosage configuration dosed volume of reducing agent. The second control unit 210 may be arranged to perform substantially similar functions to calculate a via as the first control unit 200, such as e.g. the dosing unit dosed volume of reducing agent for a period of time determined by the times for determining said first value and said second value, respectively, or comparing a detected dosed volume of reducing agent and an estimated dosed volume of reducing agent in a consumption test. It should be appreciated that the innovative method may be performed by either the first controller 200 or the second controller 210, or by both the first controller 200 and the second controller 210.
    Referring to Figure 3, a measuring device at the container 205 for reducing agents is schematically illustrated, according to an embodiment of the invention.
    According to this example, the measuring device 220 comprises a rod 221 having a number of switches 220a, 220b, 220c and 220d arranged at predetermined positions along the rod 221. The measuring device 220 may be arranged vertically in the container 205. The measuring device 220 may have any suitable number of switches arranged on this way. The measuring device 220 comprises suitable hardware and is known in the art. A float 222 is slidably arranged along the rod 221. The float 222 consists of suitable material and floats at the surface of the reductant in the container 205. The switches 220a, 220b, 220c and 220d are arranged to detect the presence of the float 222. In the presence of the float 16 222 at a given switch generates the measuring device 220 a signal which includes information about which switch detects the presence of the float. This information corresponds to a predetermined level of residual reducing agent in the container 205. This information thus corresponds to a predetermined volume (or amount) of residual reducing agent in the container 205. The detected residual volume of reducing agent is a discrete volume indication, which information is sent in a signal to the first control unit 200 via link 293.
    Figure 3 shows that the float 222 is located at a surface 225 of the reductant.
    According to this example, the first control unit 200 has determined that a prevailing volume of reducing agent is defined by a volume corresponding to a discrete 220c. consumption of reducing agent, the level of reducing agent will volume indication associated with the switch When further dropped to a level of the switch 220c. At this point, the actual level of reducing agent corresponds to the detected level of reducing agent.
    According to the invention, the first control unit 220 determines a first value associated with a discrete volume indication of a switch which constitutes the starting point of a consumption test. This occurs at a time when the surface 225 below the measuring device 220 sets a detected discrete volume indication to a predetermined switch so much that subsequent (lower) discrete volume indication. According to the invention, however, a discrete volume indication corresponding to the switch just passed is saved to form part of a base for a consumption test. In this case, a higher, more adequate, discrete volume indication can be used as a starting point for the pre-canning test, whereby a higher accuracy can be achieved. According to one example, the start of the innovative procedure may be conditional on a favorable relationship. A favorable condition can be any condition where rippling of the reducing agent in the container is minimal, such as e.g. when driving with a substantially constant firmness on a level surface, or when the vehicle is standing still on a level surface. According to the invention, the first control unit 220 determines a second value associated with a discrete volume indication of a switch which constitutes the end point of the consumption test. This occurs at a time when the surface 225 is less than a predetermined switch so much that the measuring device 220 sets a detected discrete volume indication to a subsequent (lower) discrete volume indication. According to the invention, however, a discrete volume indication corresponding to the just passed switch is saved away to form part of a base for a consumption test. In this case, a higher, discrete can can be tested, whereby a higher accuracy can be achieved. more adequately, voiymangspelse is used as an end point for According to an example, the steps to determine said first and second value of the innovative procedure may be conditional on a favorable relationship.
    A favorable condition can be any condition where rippling of the reducing agent in the container is minimal, such as e.g. when driving with a substantially constant firmness on a level surface, or when the vehicle is standing still on a level surface.
    As shown in Figure 3, each switch of the rod 221 corresponds to a predetermined volume of residual reducing agent. These can be called V1, V2, V3, V4 etc. If there are N switches arranged via the rod 221, there are N pieces corresponding to discrete volume indications used according to the innovative method, where N is a positive integer.
    It should also be clear that a difference Vdetect constitutes a difference between two arbitrary volume indications, corresponding to a first and a second value representing a remaining volume of reducing agent at two different times. For example. Vdetect can be defined by V1-V2, V1 -V4, V2-V3 or V3-V4. The first control unit 200 is arranged to calculate a volume of Vcalculated reducing agent dosed via the dosing unit 250, which is to serve as a comparison basis in a consumption test, according to an aspect of the invention.
    Figure 4a schematically illustrates a flow chart of a method of an SCR system for exhaust gas purification comprising a container for accommodating a reducing agent and a dosing unit, according to an embodiment of the invention. The method comprises a first method step s401. Step s401 includes the steps of: - continuously detecting discrete indications for the remaining volume of reducing agent in said container; - determining a first value for said residual volume to the last detected indication for the remaining volume of reducing agent, and - determining a second value for said remaining volume to the last detected indication for the remaining volume of reducing agent, for determining a detected dosed volume reducing agent. After step s401, the process is terminated.
    Figure 4b schematically illustrates a flow chart of a method of an SCR system for exhaust gas purification comprising a container for accommodating a reducing agent and a dosing unit, according to an embodiment of the invention.
    The method includes a first method step s410. Method step s410 includes the step of continuously detecting discrete indications of residual volume of reducing agent in said container. This can be done by means of the measuring device 220 in the manner indicated above. After the process step s410, a subsequent process step s420 is performed.
    The method step s420 includes the step of determining a first value for said remaining volume to the last detected indication for remaining volume of reducing agent. This can be performed by the first control unit 200. 19 Thereafter, a subsequent method step s430 is performed.
    Method step s430 includes the step of determining a second value for said residual volume to the last detected indication for residual volume reducing agent, for determining a detected dosed volume reducing agent. This can be performed by the first control unit 200. After the process step s430, a subsequent process step s440 is performed.
    The method step s440 comprises the steps of calculating a volume of reducing agent dosed via said dosing unit for a period of time determined by the times for determining said first value and said second value, respectively, and comparing said detected dosed volume reducing agent and said calculated dosed volume reducing agent in a consumption test. This can be done by the first control unit 200. After the process step s440, the process is terminated.
    Referring to Figure 5, there is shown a diagram of an embodiment of a device 500. The controllers 200 and 210 described with reference to Figure 2 may in one embodiment include the device 500. The device 500 includes a non-volatile memory 520, a data processing unit 510, and a read / write memory 550. The non-volatile memory 520 has a first memory portion 530 in which a computer program, such as an operating system, is stored to control the operation of the device 200. Further, the device 500 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 520 also has a second memory portion 540.
    A computer program P is provided which includes routines for continuously detecting discrete indications for the remaining volume of reducing agent in said container. The computer program P comprises routines for determining a first value for said remaining volume, and determining a second value for said remaining volume, for determining a detected dosed volume of reducing agent. The computer program P includes routines for determining said first value and said second value to the respective last detected indication for the remaining volume of reducing agent, according to the innovative procedure. The program P can be stored in an executable manner or in a compressed manner in a memory 560 and / or in a read / write memory 550.
    When it is described that the data processing unit 510 performs a certain function, it is to be understood that the data processing unit 510 performs a certain part of the program which is stored in the memory 560, or a certain part of the program which is stored in the read / write memory 550.
    The data processing device 510 can communicate with a data port 599 via a data bus 515. The non-volatile memory 520 is intended for communication with the data processing unit 510 via a data bus 512. The separate memory 560 is intended to communicate with the data processing unit 510 via a data bus 511. the data processing unit 510 via a data bus 514. To the data port 599, e.g. links 290, 291, 292 and 293 are connected (see Figure 2).
    The read / write memory 550 is arranged to communicate with When data is received on the data port 599, it is temporarily stored in the second memory part 540. When the received input data has been temporarily stored, the data processing unit 510 is prepared to perform code execution in a manner described above. According to one embodiment, signals received (discrete volume indication) include reducing means in the container 205. The received signals on the data port 599 information about a detected volume on the data port 599 can be used by the device 500 to compare a detected dosed volume reducing agent and a calculated via 250 consumption test, according to an aspect of the invention. The device 500 is arranged to calculate a volume of reducing agent dosed via said dosing unit for a period of time determined by the times for determining said first value and said second value, respectively.
    Parts of the methods described herein may be performed by the device 500 by means of the data processing unit 510 running the program stored in the memory 560 or the read / write memory 550. When the device 500 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 (19)
    [1]
    A method of an SCR system for exhaust gas purification comprising a container (205) for containing a reducing agent and a dosing unit (250), comprising the steps of: - continuously detecting (S410) discrete indications of residual volume of reducing agent in said container; characterized by the steps of - determining (S420) a first value (V1-VN) for said remaining volume to the last detected indication for remaining volume of reducing agent, and - determining (S430) a second value (V1-VN) for said remaining volume to last detected indication for residual volume reducing agent, for determining a detected dosed volume (Vdetect) reducing agent.
    [2]
    The method of claim 1, further comprising the step of: - determining said first value (V1-VN) at any suitable discrete indication for residual volume of reducing agent.
    [3]
    A method according to claim 1 or 2, further comprising the step of: - determining said second value (V1-VN) at any suitable discrete indication for the remaining volume of reducing agent.
    [4]
    A method according to any one of claims 1-3, further comprising the step of: - determining said first value (V1-VN) and said second value (V1-VN) with a predetermined number of intermediate discrete indications for the remaining volume of reducing agent.
    [5]
    A method according to any one of claims 1-4, wherein said first value (V1-VN) and said second value (V1-VN) are determined to correspond to a predetermined volume difference.
    [6]
    A method according to any one of claims 1-5, further comprising the step of: - calculating a reducing agent dosed via said dosing unit (250) for a period of time determined by the times for determining volume of said first value (V1 -VN ) and said second value (V1-VN).
    [7]
    The method of claim 6, further comprising the step of: (S450) reducing agent and said calculated dosed volume - comparing said detected dosed volume (Vdetect) (Vcalculated) reducing agent in a consumption test.
    [8]
    An SCR system for exhaust gas purification comprising a container (205) for containing a reducing agent and a dosing unit (250), comprising: - means (220) for continuously detecting discrete indications of residual volume of reducing agent in said container; characterized by - means (200; 210; 500; 510) for determining a first value for said residual volume to the last detected indication for remaining volume of reducing agent, and - means (200; 210; 500; 510) for determining a second value for said residual volume to the last detected indication for residual volume reducing agent, for determining a detected dosed volume (Vdetect) reducing agent.
    [9]
    The SCR system of claim 8, further comprising: - means (200; 210; 500; 510) for determining said first value (V1 -VN) at any suitable discrete indication of residual volume of reducing agent.
    [10]
    An SCR system according to claim 8 or 9, further comprising: - means (200; 210; 500; 510) for determining said second value (V1 -VN) at any suitable discrete indication for residual volume of reducing agent.
    [11]
    The SCR system of any of claims 8-10, further comprising: means (200; 210; 500; 510) for determining said first value (V1-VN) and said second value (V1 -VN) with a predetermined number of intermediate discrete indications for the remaining volume of reducing agent.
    [12]
    An SCR system according to any one of claims 8-11, wherein said first value (V1 -VN) and said second value (V1-VN) are determined to correspond to a predetermined volume difference (Vdetect).
    [13]
    An SCR system according to any one of claims 8-12, further comprising: - means (200; 210; 500; 510) for calculating a volume (Vcalculated) reducing agent dosed via said dosing unit (250) for a period of time determined by the times of determination of said first value (V1 -VN) and said second value (V1-VN), respectively.
    [14]
    The SCR system of claim 13, further comprising: - means (200; 210; 500; 510) for comparing said detected dose volume (Vdetect) reducing agent and said calculated dose volume (Vcalculated) reducing agent in a consumption test.
    [15]
    An SCR system according to any one of claims 8-14, wherein said reducing agent is a fluid solution comprising urea.
    [16]
    Motor vehicle (100; 110) comprising an SCR system according to any one of claims 8-15.
    [17]
    A motor vehicle (100; 110) according to claim 16, wherein the motor vehicle is something of a truck, bus or passenger car.
    [18]
    Computer program (P) comprising program code for causing an electronic control unit (200; 500) or another computer (210; 500) connected to the electronic control unit (200; 500) to perform the steps according to any one of claims 1-7. 25
    [19]
    A computer program product comprising a program code stored on a computer readable medium for performing the method steps of any of claims 1-7, when said computer program is run on an electronic control unit (200; 500) or another computer (210; 500) connected to the electronic control unit (200; 500).
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    同族专利:
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    BR112013026171A2|2020-10-27|
    KR101864819B1|2018-07-04|
    JP2014513234A|2014-05-29|
    KR20140005331A|2014-01-14|
    EP2699776A4|2014-09-24|
    EP2699776B1|2020-06-10|
    WO2012144945A1|2012-10-26|
    EP2699776A1|2014-02-26|
    BR112013026171B1|2021-08-03|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1150342A|SE538288C2|2011-04-19|2011-04-19|SCR system and a procedure of an SCR system|SE1150342A| SE538288C2|2011-04-19|2011-04-19|SCR system and a procedure of an SCR system|
    JP2014506364A| JP2014513234A|2011-04-19|2012-04-05|Method and apparatus for determining the volume of reducing agent administered in an SCR system|
    BR112013026171-4A| BR112013026171B1|2011-04-19|2012-04-05|METHOD TO DETERMINE THE VOLUME OF REDUCING AGENT DOSED IN AN SCR SYSTEM, SCR SYSTEM, MOTOR VEHICLE AND READIBLE MEDIUM|
    PCT/SE2012/050373| WO2012144945A1|2011-04-19|2012-04-05|Method and device for determining the dosed reducing agent volume in an scr system|
    KR1020137030720A| KR101864819B1|2011-04-19|2012-04-05|Method and device for determining the dosed reducing agent volume in an scr system|
    EP12774879.6A| EP2699776B1|2011-04-19|2012-04-05|Method and device for determining the dosed reducing agent volume in an scr system|
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