A method, device, equipment and storage medium for correcting the SCR closed-loop coefficient of a vehicle

Abstract

The present invention discloses a method, device, equipment and storage medium for correcting the closed-loop coefficient of a vehicle SCR. Among them, the method includes the steps of: setting a first closed-loop coefficient corresponding to different urea concentrations; calculating a second closed-loop coefficient of the selective catalytic reduction converter (SCR) of the vehicle and comparing the first closed-loop coefficient with the second closed-loop coefficient; when it is determined that the second closed-loop coefficient is greater than the first closed-loop coefficient, the first closed-loop coefficient is adopted, and when it is determined that the second closed-loop coefficient is less than the first closed-loop coefficient, the second closed-loop coefficient is adopted. By restricting the closed-loop correction coefficient, the present application can avoid high urea consumption, urea crystallization and ammonia slip, and at the same time can also reduce the nitrogen oxides in the tail gas and avoid reporting the fault of low SCR efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and particularly to a method, device, equipment and storage medium for correcting the closed-loop coefficient of a vehicle SCR. Background Art

[0002] The post-treatment system of the National VI diesel engine mainly uses SCR technology to control NOx gas emissions. By injecting urea into the exhaust gas, ammonia generated by the decomposition of urea reacts with NOx under the action of a catalyst to reduce emissions. SCR control strategies include open-loop control and closed-loop control. In the National IV and National V stages, open-loop control is mainly used. In the National VI stage, open-loop control can no longer meet the regulatory requirements. When there are problems such as low-concentration urea, injection accuracy deviation of the urea injection system, deviation of the ammonia storage model, mixer damage, atomization failure of the urea injection system, and catalyst efficiency decline, closed-loop control is required to reduce tailpipe NOx.

[0003] In the existing closed-loop control strategy, some vehicles have the problem that when using normal-concentration urea, the closed-loop coefficient is corrected to a large value, resulting in high urea consumption and still a high measured value of the tailpipe NOx sensor. The reason is caused by other failures except low-concentration urea. It is analyzed that other failure reasons are not suitable for using a large closed-loop coefficient: ① For the current mainstream products in the market of the urea injection system, the injection accuracy deviation can be controlled within ±10%, and only a small correction is needed; ② For the deviation of the ammonia storage model, only a small closed-loop coefficient correction is required, otherwise it will cause a greater deviation of the ammonia storage model; ③ When the mixer is damaged or the atomization of the injection system fails, it will lead to a decline in the atomization quality of urea, and it cannot be evenly mixed with the exhaust gas, resulting in urea crystallization. Injecting more urea will only aggravate the crystallization; ④ When the catalyst causes a decline in the conversion efficiency of SCR and ASC due to sulfur poisoning, etc., the urea injection amount is sufficient at this time. Injecting more urea cannot completely react, but will instead cause urea waste and ammonia slip.

[0004] In order to adapt to the low-concentration urea existing in the market, it is necessary to increase the maximum allowable value of the closed-loop correction coefficient so that the closed-loop coefficient can increase to a large value, such as above 1.25. However, this will also cause the closed-loop coefficient to be corrected to a large value in other failure cases. When the urea concentration is normal, excessive injection of urea cannot solve the problem of high tailpipe NOx caused by other failures, but will also cause high urea consumption, urea crystallization and ammonia slip. In addition, when the vehicle switches to low-concentration urea above the CDmin concentration, due to the time required for the increase of the closed-loop coefficient, the tailpipe NOx is high during this period, and in severe cases, an SCR efficiency low fault will be reported.

[0005] Therefore, how to limit the closed-loop correction coefficient and thus avoid excessive injection of urea is a technical problem that needs to be solved urgently at present. Summary of the Invention

[0006] The main purpose of the present invention is to provide an SCR closed-loop coefficient correction method, device, equipment and storage medium. By restricting the closed-loop correction coefficient, it is possible to avoid high urea consumption, urea crystallization and ammonia slip, while also reducing nitrogen oxides in the tail gas and avoiding reporting low SCR efficiency faults.

[0007] In a first aspect, the present application provides a vehicle SCR closed-loop coefficient correction method, wherein the method includes the steps of:

[0008] Set the first closed-loop coefficient corresponding to different urea concentrations;

[0009] Calculate the second closed-loop coefficient of the selective catalytic reduction converter (SCR) of the vehicle and compare the first closed-loop coefficient with the second closed-loop coefficient;

[0010] When it is determined that the second closed-loop coefficient is greater than the first closed-loop coefficient, the first closed-loop coefficient is adopted; when it is determined that the second closed-loop coefficient is less than the first closed-loop coefficient, the second closed-loop coefficient is adopted.

[0011] Combined with the above first aspect, as an optional implementation, when the vehicle urea concentration value is detected to be lower than the preset urea concentration value, the SCR closed-loop correction coefficient of the vehicle is reset to the preset closed-loop coefficient corresponding to the preset urea concentration.

[0012] Combined with the above first aspect, as an optional implementation, the preset urea concentration value is 0% - 30%, and the value range of the corresponding closed-loop coefficient is 1.05 - 10.0.

[0013] Combined with the above first aspect, as an optional implementation, calculate the first closed-loop coefficient corresponding to different urea concentrations according to the ratio between the standard concentration and the actual concentration.

[0014] Combined with the above first aspect, as an optional implementation, calculate the second closed-loop coefficient of the selective catalytic reduction converter (SCR) of the vehicle according to the deviation between the nitrogen oxides in the tail gas and the expected value and the SCR model.

[0015] In a second aspect, the present application provides a vehicle SCR closed-loop coefficient correction device, which includes:

[0016] A setting module for setting the first closed-loop coefficient corresponding to different urea concentrations;

[0017] A determination module for calculating the second closed-loop coefficient of the selective catalytic reduction converter (SCR) of the vehicle and comparing the first closed-loop coefficient with the second closed-loop coefficient;

[0018] An execution module, which is configured to adopt the first closed-loop coefficient when it is determined that the second closed-loop coefficient is greater than the first closed-loop coefficient, and adopt the second closed-loop coefficient when it is determined that the second closed-loop coefficient is less than the first closed-loop coefficient.

[0019] Combined with the above second aspect, as an optional implementation manner, the execution module is further configured to reset the SCR closed-loop correction coefficient of the vehicle to the preset closed-loop coefficient corresponding to the preset urea concentration when it is detected that the vehicle urea concentration value is lower than the preset urea concentration value.

[0020] Combined with the above second aspect, as an optional implementation manner, the calculation module is further configured to calculate the first closed-loop coefficient corresponding to different urea concentrations according to the ratio between the standard concentration and the actual concentration.

[0021] In a third aspect, the present application further provides an electronic device, which includes: a processor; a memory, and a computer-readable instruction is stored on the memory, and when the computer-readable instruction is executed by the processor, the method described in any item of the first aspect is implemented.

[0022] In a fourth aspect, the present application further provides a computer-readable storage medium, which stores computer program instructions, and when the computer program instructions are executed by a computer, the computer is caused to execute the method described in any item of the first aspect.

[0023] A method, device, equipment and storage medium for correcting the SCR closed-loop coefficient of a vehicle provided by the present application, wherein the method includes the steps of: setting the first closed-loop coefficient corresponding to different urea concentrations; calculating the second closed-loop coefficient of the selective catalytic reduction converter (SCR) of the vehicle, and comparing the first closed-loop coefficient with the second closed-loop coefficient; when it is determined that the second closed-loop coefficient is greater than the first closed-loop coefficient, adopting the first closed-loop coefficient, and when it is determined that the second closed-loop coefficient is less than the first closed-loop coefficient, adopting the second closed-loop coefficient. By restricting the closed-loop correction coefficient, the present application can avoid high urea consumption, urea crystallization and ammonia slip, and at the same time can also reduce the tailpipe nitrogen oxides and avoid reporting the SCR efficiency low fault.

[0024] It should be understood that the above general description and the following detailed description are only exemplary and cannot limit the present invention. Description of the Drawings

[0025] The accompanying drawings here are incorporated into the specification and constitute a part of this specification, showing the embodiments consistent with the present invention, and are used together with the specification to explain the principles of the present invention.

[0026] Figure 1 It is a flowchart of a method for correcting the SCR closed-loop coefficient of a vehicle provided in an embodiment of the present application;

[0027] Figure 2Schematic diagram of a vehicle SCR closed-loop coefficient correction device provided in an embodiment of the present application;

[0028] Figure 3 Schematic diagram of an electronic device provided in an embodiment of the present application;

[0029] Figure 4 Schematic diagram of a computer-readable program medium provided in an embodiment of the present application. Detailed implementation manners

[0030] Here, an exemplary embodiment will be described in detail, and its examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present invention. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0031] In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. Some of the block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0032] The embodiment of the present application provides a vehicle SCR closed-loop coefficient correction method, device, equipment and storage medium. By restricting the closed-loop correction coefficient, it is possible to avoid high urea consumption, urea crystallization and ammonia slip, and at the same time reduce the nitrogen oxides in the tail gas and avoid reporting the SCR efficiency low fault.

[0033] To achieve the above technical effects, the general idea of the present application is as follows:

[0034] A vehicle SCR closed-loop coefficient correction method, the method includes steps:

[0035] S101: Set the first closed-loop coefficient corresponding to different urea concentrations.

[0036] S102: Calculate the second closed-loop coefficient of the selective catalytic reduction converter SCR of the vehicle, and compare the first closed-loop coefficient with the second closed-loop coefficient.

[0037] S103: When it is determined that the second closed-loop coefficient is greater than the first closed-loop coefficient, adopt the first closed-loop coefficient; when it is determined that the second closed-loop coefficient is less than the first closed-loop coefficient, adopt the second closed-loop coefficient.

[0038] The following further details the embodiments of the present application with reference to the drawings.

[0039] Refer to Figure 1 , Figure 1 The flowchart of a vehicle SCR closed-loop coefficient correction method provided by the present invention is shown asFigure 1 As shown, the method includes the steps of:

[0040] Step S101: Set the first closed-loop coefficient corresponding to different urea concentrations.

[0041] Specifically, based on the urea concentration, set the upper limit of the closed-loop coefficient corresponding to different concentrations. It should be noted that in the existing closed-loop control strategy, for some vehicles, when using urea at normal concentration, the closed-loop coefficient is corrected to a large value, resulting in high urea consumption and still high measured values of the tailpipe NOx sensor. The purpose of setting the upper limit of the closed-loop coefficient corresponding to different concentrations is to limit the SCR closed-loop correction coefficient (closed-loop coefficient). The closed-loop coefficient is limited to a small value, so there will be no excessive injection, avoiding high urea consumption, urea crystallization, and ammonia slip.

[0042] It should be noted that Selective Catalytic Reduction (SCR) is a technology used to reduce nitrogen oxide (NOx) emissions in diesel engine exhaust. The SCR system generally includes components such as a catalyst, a urea injector, an oxygen sensor, and a control unit. When a diesel engine burns, a large amount of NOx emissions are generated. These emissions enter the SCR catalytic converter through the exhaust pipe and react with the aqueous urea solution under the action of the catalyst to reduce NOx into harmless nitrogen and water vapor. SCR technology can effectively reduce the exhaust emissions of diesel vehicles and is a widely adopted exhaust emission control technology for modern diesel vehicles.

[0043] In one embodiment, calculate the first closed-loop coefficient corresponding to different urea concentrations according to the ratio between the standard concentration and the actual concentration.

[0044] For easy understanding, by way of example, taking a urea concentration of 10% as an example, the closed-loop coefficient of 10% urea concentration = standard concentration 32.5% ÷ actual concentration 10% = 3.25, and the upper limit is generally approximately equal to 3.25, which can be understood as 3.25 ± 10%. The calculation of the urea closed-loop coefficient for other concentrations is the same.

[0045] Step S102: Calculate the second closed-loop coefficient of the vehicle's Selective Catalytic Reduction Converter (SCR) and compare the first closed-loop coefficient with the second closed-loop coefficient.

[0046] Specifically, the closed-loop coefficient is calculated based on the tailpipe nitrogen oxides. It can be understood that the second closed-loop coefficient of the vehicle's Selective Catalytic Reduction Converter (SCR) is calculated based on the deviation between the tailpipe nitrogen oxides and the expected value and the SCR model efficiency.

[0047] Compare the first closed-loop coefficient with the second closed-loop coefficient. When it is determined that the second closed-loop coefficient is greater than the first closed-loop coefficient, the first closed-loop coefficient is adopted; when it is determined that the second closed-loop coefficient is less than the first closed-loop coefficient, the second closed-loop coefficient is adopted.

[0048] For easy understanding, an example is given. Based on the urea concentration, the upper limit of the closed-loop coefficient corresponding to different concentrations is set. The closed-loop coefficient 1 is calculated based on the deviation between the tailpipe NOx and the expected value and the SCR model efficiency. When the closed-loop coefficient 1 exceeds the upper limit of the closed-loop coefficient corresponding to the current urea concentration, the upper limit value is used as the SCR closed-loop coefficient; otherwise, the closed-loop coefficient 1 is directly used as the SCR closed-loop coefficient. When the urea concentration is normal, the upper limit value is set to a smaller value, and as the urea concentration decreases, the upper limit value gradually increases. This can not only adapt to the low-concentration urea existing in the market but also avoid the high urea consumption, urea crystallization, and ammonia slip caused by excessive urea injection during other faults. It should be noted that for the first closed-loop coefficient, the concentration should include the normal range of 0% to 35%, and its closed-loop coefficient range is 1.05 to 10.0.

[0049] In one embodiment, when the detected vehicle urea concentration value is lower than the preset urea concentration value, the SCR closed-loop correction coefficient of the vehicle is reset to the preset closed-loop coefficient corresponding to the preset urea concentration.

[0050] For easy understanding, an example is given. When the vehicle switches to low-concentration urea and the detected urea concentration is lower than the preset urea concentration value, the SCR closed-loop correction coefficient is reset to the preset closed-loop coefficient corresponding to the preset urea concentration. This reset only occurs instantaneously after the detected urea concentration drops, and after the reset, the SCR closed-loop correction coefficient will continue to change according to the closed-loop coefficient 1. In this way, when switching to low-concentration urea, the closed-loop coefficient will immediately increase, reducing the tailpipe NOx and avoiding reporting the SCR low-efficiency fault. Multiple levels of preset urea concentration can be set, and correspondingly, multiple preset closed-loop coefficients are set. The preset closed-loop coefficient increases as the preset urea concentration decreases. The value range of the preset urea concentration is 0% to 30%, and the value range of the preset closed-loop coefficient is 1.05 to 10.0.

[0051] It should be noted that the national VI regulations require that the production enterprise should specify a minimum acceptable reactant concentration (CDmin) so that the tailpipe NOx still meets the regulations. The lower the CDmin concentration, the lower the concentration of urea that the vehicle can adapt to. Otherwise, a low urea concentration fault will be reported, and the vehicle will be torque-limited and speed-limited according to the regulations. Low-concentration urea will reduce the ammonia entering the SCR reaction. To achieve a lower CDmin, it is realized by the closed-loop correction coefficient, increasing the urea injection amount so that the ammonia entering the SCR reaction reaches the level of normal-concentration urea. In addition, the closed-loop coefficient does not change transiently and significantly with the change of tailpipe NOx, but increases and decreases slowly. For example, the national VI regulations allow about 4.5 hours for 9 WHTC cycles to complete the pretreatment of urea with a CDmin concentration.

[0052] It is understandable that when the user uses 16% urea (half the concentration of 32.5%), in order for the SCR chemical reaction to proceed normally, it is necessary to increase the urea injection amount by 2 times, that is, the closed-loop coefficient is 2.

[0053] When the user adds low-concentration urea, it takes a certain amount of time for the closed-loop coefficient 1 of the original technology to increase, which will cause the emissions to exceed the standard during this period or even report a low SCR efficiency fault. Therefore, it occurs immediately after detecting a decrease in urea concentration. After resetting, the SCR closed-loop correction coefficient will immediately increase the closed-loop coefficient to reduce the tailpipe NOx and avoid reporting a low SCR efficiency fault.

[0054] Step S103: When it is determined that the second closed-loop coefficient is greater than the first closed-loop coefficient, the first closed-loop coefficient is adopted; when it is determined that the second closed-loop coefficient is less than the first closed-loop coefficient, the second closed-loop coefficient is adopted.

[0055] Specifically, after comparing the first closed-loop coefficient with the second closed-loop coefficient, when it is determined that the second closed-loop coefficient is greater than the first closed-loop coefficient, the first closed-loop coefficient is adopted; when it is determined that the second closed-loop coefficient is less than the first closed-loop coefficient, the second closed-loop coefficient is adopted.

[0056] It is understandable that when the closed-loop coefficient of the selective catalytic reduction converter SCR of the vehicle exceeds the upper limit of the closed-loop coefficient corresponding to the current urea concentration, the upper limit value of the closed-loop coefficient corresponding to the current urea concentration is used as the vehicle SCR closed-loop coefficient; when the closed-loop coefficient of the selective catalytic reduction converter SCR of the vehicle does not exceed the upper limit of the closed-loop coefficient corresponding to the current urea concentration, the closed-loop coefficient of the selective catalytic reduction converter SCR of the vehicle is used.

[0057] It is understandable that when the concentration of urea is normal, the closed-loop coefficient is limited to a small value, which will not cause excessive injection, avoiding high urea consumption, urea crystallization and ammonia slip. When the vehicle switches to low-concentration urea, the closed-loop coefficient will be immediately increased to reduce the tailpipe NOx and avoid reporting a low SCR efficiency fault.

[0058] In summary, the present invention discloses a method, device, equipment and storage medium for correcting the SCR closed-loop coefficient of a vehicle. The method includes the steps of: setting a first closed-loop coefficient corresponding to different urea concentrations; calculating a second closed-loop coefficient of the selective catalytic reduction converter SCR of the vehicle and comparing the first closed-loop coefficient with the second closed-loop coefficient; when it is determined that the second closed-loop coefficient is greater than the first closed-loop coefficient, the first closed-loop coefficient is adopted; when it is determined that the second closed-loop coefficient is less than the first closed-loop coefficient, the second closed-loop coefficient is adopted. By restricting the closed-loop correction coefficient, the present application can avoid high urea consumption, urea crystallization and ammonia slip, and at the same time reduce the tailpipe nitrogen oxides and avoid reporting a low SCR efficiency fault.

[0059] Refer toFigure 2 , Figure 2 The figure shows a schematic diagram of a vehicle SCR closed-loop coefficient correction device provided by the present invention. As Figure 2 shown, the device includes:

[0060] A setting module 201: It is used to set the first closed-loop coefficient corresponding to different urea concentrations.

[0061] A determination module 202: It is used to calculate the second closed-loop coefficient of the selective catalytic reduction converter SCR of the vehicle, and compare the first closed-loop coefficient with the second closed-loop coefficient.

[0062] An execution module 203: It is used to adopt the first closed-loop coefficient when it is determined that the second closed-loop coefficient is greater than the first closed-loop coefficient, and adopt the second closed-loop coefficient when it is determined that the second closed-loop coefficient is less than the first closed-loop coefficient.

[0063] Furthermore, in a possible implementation manner, the execution module is further used to reset the SCR closed-loop correction coefficient of the vehicle to the preset closed-loop coefficient corresponding to the preset urea concentration when it is detected that the vehicle urea concentration value is lower than the preset urea concentration value.

[0064] Furthermore, in a possible implementation manner, it further includes a setting module, which is used to set the preset urea concentration value to 0% - 30%, and the value range of the corresponding closed-loop coefficient is 1.05 - 10.0.

[0065] Furthermore, in a possible implementation manner, the calculation module is further used to calculate the first closed-loop coefficient corresponding to different urea concentrations according to the ratio between the standard concentration and the actual concentration.

[0066] Furthermore, in a possible implementation manner, the calculation module is further used to calculate the second closed-loop coefficient of the selective catalytic reduction converter SCR of the vehicle according to the deviation between the nitrogen oxides in the tail gas and the expected value and the SCR model.

[0067] Next, refer to Figure 3 to describe the electronic device 300 according to this embodiment of the present invention. Figure 3 The displayed electronic device 300 is only an example and should not bring any limitation to the functions and usage scope of the embodiments of the present invention.

[0068] As Figure 3 shown, the electronic device 300 is presented in the form of a general-purpose computing device. The components of the electronic device 300 may include but are not limited to: at least one of the above-mentioned processing units 310, at least one of the above-mentioned storage units 320, and a bus 330 connecting different system components (including the storage unit 320 and the processing unit 310).

[0069] Among them, the storage unit stores program code, and the program code can be executed by the processing unit 310, so that the processing unit 310 executes the steps according to various exemplary embodiments of the present invention described in the "Embodiment Method" section of this specification.

[0070] The storage unit 320 may include a readable medium in the form of a volatile storage unit, such as a random access storage unit (RAM) 321 and / or a cache storage unit 322, and may further include a read-only storage unit (ROM) 323.

[0071] The storage unit 320 may further include a program / utilities 324 having a set (at least one) of program modules 325. Such program modules 325 include, but are not limited to: an operating system, one or more application programs, other program modules, and program data. Each or some combination of these examples may include the implementation of a network environment.

[0072] The bus 330 may represent one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus structures.

[0073] The electronic device 300 may also communicate with one or more external devices (such as a keyboard, a pointing device, a Bluetooth device, etc.), may also communicate with one or more devices that enable a user to interact with the electronic device 300, and / or communicate with any device that enables the electronic device 300 to communicate with one or more other computing devices (such as a router, a modem, etc.). Such communication may be carried out through an input / output (I / O) interface 350. And, the electronic device 300 may also communicate with one or more networks (such as a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) through a network adapter 360. As shown in the figure, the network adapter 360 communicates with other modules of the electronic device 300 through the bus 330. It should be understood that although not shown in the figure, other hardware and / or software modules may be used in combination with the electronic device 300, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, etc.

[0074] Through the description of the above embodiments, those skilled in the art can easily understand that the exemplary embodiments described herein can be implemented by software or by a combination of software and necessary hardware. Therefore, the technical solutions according to the embodiments of the present disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, including several instructions for causing a computing device (such as a personal computer, a server, a terminal device, or a network device, etc.) to execute the method according to the embodiments of the present disclosure.

[0075] According to the solution of the present disclosure, there is also provided a computer-readable storage medium, on which a program product capable of implementing the above method of this specification is stored. In some possible embodiments, various aspects of the present invention can also be implemented in the form of a program product, which includes program code. When the program product runs on a terminal device, the program code is used to cause the terminal device to execute the steps according to various exemplary embodiments of the present invention described in the above "Exemplary Method" section of this specification.

[0076] Reference Figure 4 As shown, a program product 400 for implementing the above method according to an embodiment of the present invention is described. It can be a portable compact disc read-only memory (CD-ROM) and includes program code, and can run on a terminal device, such as a personal computer. However, the program product of the present invention is not limited thereto. In this document, the readable storage medium can be any tangible medium that contains or stores a program, and the program can be used by or in combination with an instruction execution system, apparatus, or device.

[0077] The program product can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples (non-exhaustive list) of the readable storage medium include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0078] A computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries readable program code. Such a propagated data signal may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the foregoing. The readable signal medium may also be any readable medium other than a readable storage medium, which can send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0079] The program code contained on the readable medium may be transmitted by any appropriate medium, including but not limited to wireless, wired, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0080] The program code for performing the operations of the present invention may be written in any combination of one or more programming languages, including object-oriented programming languages such as Java, C++, etc., and also including conventional procedural programming languages such as the "C" language or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, executed as a stand-alone software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., connected through the Internet using an Internet service provider).

[0081] In addition, the above drawings are only schematic illustrations of the processes included in the method according to the exemplary embodiments of the present invention, rather than for limiting purposes. It is easy to understand that the processes shown in the above drawings do not indicate or limit the chronological order of these processes. Additionally, it is also easy to understand that these processes may be executed synchronously or asynchronously, for example, in multiple modules.

[0082] In summary, the present application provides a method, apparatus, device, and storage medium for correcting the closed-loop coefficient of a vehicle SCR. The method includes the steps of: setting a first closed-loop coefficient corresponding to different urea concentrations; calculating a second closed-loop coefficient of the selective catalytic reduction converter (SCR) of the vehicle and comparing the first closed-loop coefficient with the second closed-loop coefficient; when it is determined that the second closed-loop coefficient is greater than the first closed-loop coefficient, the first closed-loop coefficient is adopted, and when it is determined that the second closed-loop coefficient is less than the first closed-loop coefficient, the second closed-loop coefficient is adopted. By limiting the closed-loop correction coefficient, the present application can avoid high urea consumption, urea crystallization, and ammonia slip, and at the same time can reduce the tailpipe nitrogen oxides and avoid reporting the SCR efficiency low fault.

[0083] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features claimed herein.

[0084] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and combinations of flows and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device create means for implementing the functions specified in Figure 1 one or more of the flows or multiple flows and / or blocks Figure 1 one or more of the blocks or multiple blocks.

Claims

1. A method for correcting the SCR closed-loop coefficient of a vehicle, characterized in that, Including: Setting the first closed-loop coefficient corresponding to different urea concentrations; Calculating the second closed-loop coefficient of the selective catalytic reduction converter (SCR) of the vehicle and comparing the first closed-loop coefficient with the second closed-loop coefficient; When it is determined that the second closed-loop coefficient is greater than the first closed-loop coefficient, using the first closed-loop coefficient; when it is determined that the second closed-loop coefficient is less than the first closed-loop coefficient, using the second closed-loop coefficient; Among them, the first closed-loop coefficient corresponding to different urea concentrations is calculated according to the ratio between the standard concentration and the actual concentration; The second closed-loop coefficient of the selective catalytic reduction converter (SCR) of the vehicle is calculated based on the deviation between the nitrogen oxides in the tail gas and the expected value and the SCR model.

2. The method according to claim 1, characterized in that, It also includes: When it is detected that the vehicle urea concentration value is lower than the preset urea concentration value, resetting the vehicle SCR closed-loop correction coefficient to the preset closed-loop coefficient corresponding to the preset urea concentration.

3. The method according to claim 2, characterized in that: The preset urea concentration value is 0% to 30%, and the value range of the corresponding closed-loop coefficient is 1.05 to 10.

0.

4. A device for correcting the SCR closed-loop coefficient of a vehicle, characterized in that, Including: A setting module for setting the first closed-loop coefficient corresponding to different urea concentrations; A determination module for calculating the second closed-loop coefficient of the selective catalytic reduction converter (SCR) of the vehicle and comparing the first closed-loop coefficient with the second closed-loop coefficient; An execution module for using the first closed-loop coefficient when it is determined that the second closed-loop coefficient is greater than the first closed-loop coefficient, and using the second closed-loop coefficient when it is determined that the second closed-loop coefficient is less than the first closed-loop coefficient; A calculation module for calculating the first closed-loop coefficient corresponding to different urea concentrations according to the ratio between the standard concentration and the actual concentration; The second closed-loop coefficient of the selective catalytic reduction converter (SCR) of the vehicle is calculated based on the deviation between the nitrogen oxides in the tail gas and the expected value and the SCR model.

5. The device according to claim 4, characterized in that: The execution module is further configured to reset the vehicle SCR closed-loop correction coefficient to the preset closed-loop coefficient corresponding to the preset urea concentration when it is detected that the vehicle urea concentration value is lower than the preset urea concentration value.

6. An electronic device, characterized in that, The electronic device includes: A processor; A memory, on which computer-readable instructions are stored, and when the computer-readable instructions are executed by the processor, the method described in any one of claims 1 to 3 is implemented.

7. A computer-readable storage medium, characterized in that, It stores computer program instructions, and when the computer program instructions are executed by a computer, the computer is made to execute the method described in any one of claims 1 to 3.

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