A method and system for catalytic reduction treatment of vehicle exhaust gas

Abstract

The present application provides a method and system for catalytic reduction treatment of vehicle exhaust gas. By monitoring the working efficiency of the selective catalytic reduction device (SCR), and making judgments according to conditions such as the engine operating state, operating time, vehicle driving mileage, water temperature, and the internal temperature of the catalytic converter reducer after a fault of low working efficiency is reported, the automatic regeneration function triggered by the low efficiency of the selective catalytic reduction device (SCR) is enabled to increase the exhaust gas temperature of the catalytic converter reducer, remove sulfides through high temperature, reduce the deposition of sulfides in the catalytic reducer, avoid the low conversion efficiency of nitrogen oxides caused by sulfur poisoning of the catalytic reducer, and effectively ensure the performance of the catalytic reducer. In addition, the present application can also monitor the conversion efficiency of the catalytic reducer. When its performance deteriorates and a fault of low efficiency of the selective catalytic reduction device (SCR) is reported, automatic regeneration can be triggered to ensure the performance of the catalytic reducer by removing sulfur at high temperature, achieving good results and ensuring the mass production of diesel national VI vehicle models.

Description

Technical Field

[0001] This application relates to the technical field of vehicle control, and particularly to a method and system for catalytic reduction treatment of vehicle exhaust gas. Background Art

[0002] To meet the national VI emission regulations for heavy-duty vehicles (referred to as "National VI"), nitrogen oxide emissions from diesel engines undergo chemical reactions through a selective catalytic reduction (SCR) after-treatment device (main reaction equations: 4NO + O 2 + 4NH 3 → 4N 2 + 6H 2 O; 2NO 2 + O 2 + 4NH 3 → 3N 2 + 6H 2 O), and are converted into nitrogen and water vapor. When the engine is running, SO 2 in the exhaust gas is catalytically oxidized to SO 3 and reacts with water vapor and NH 3 in the exhaust gas to form a series of ammonium salts (NH 4 (SO 4 ) 2 and NH4HSO4), which cover the active sites of the catalyst, resulting in catalyst deactivation. If too much deposition occurs, it will cause sulfur poisoning of the catalytic reducer, thereby reducing the performance of the catalytic reducer. It is necessary to remove the catalytic reducer device at the maintenance service station for inspection and treatment. At the same time, when urea reacts with nitrogen oxides, the conversion efficiency of nitrogen oxides is relatively low, which will increase the nitrogen oxide pollutants emitted by the engine into the atmosphere and pollute the environment. Summary of the Invention

[0003] In view of the above-mentioned disadvantages of the prior art, the purpose of this application is to provide a method and system for catalytic reduction treatment of vehicle exhaust gas to solve the problems existing in the prior art.

[0004] To achieve the above purpose and other related purposes, this application provides a method for catalytic reduction treatment of vehicle exhaust gas, including the following steps:

[0005] Monitor the working efficiency of the selective catalytic reduction device (SCR) through the vehicle controller, and when the vehicle controller reports a low working efficiency fault of the selective catalytic reduction device, trigger the generation of an automatic regeneration particulate trap request;

[0006] Based on the automatic regeneration particulate trap request, determine whether the cumulative vehicle mileage is greater than the regeneration activation calibration mileage, whether the cumulative engine operation time of the vehicle is greater than the regeneration activation calibration time, and whether the remaining regeneration time is greater than zero;

[0007] When the cumulative vehicle mileage is greater than the regeneration activation calibration mileage, or when the cumulative engine operation time of the vehicle is greater than the regeneration activation calibration time, or when the remaining regeneration time is greater than zero, perform automatic regeneration of the particulate trap;

[0008] Use the automatically regenerated particulate trap to increase the temperature of the selective catalytic reduction device to improve the working efficiency of the selective catalytic reduction device.

[0009] Optionally, after performing automatic regeneration of the particulate trap, the method further includes:

[0010] Determine whether the vehicle controller continuously reports a fault of low working efficiency of the selective catalytic reduction device;

[0011] If the vehicle controller continuously reports a fault of low working efficiency of the selective catalytic reduction device, continue to generate an automatic regeneration particulate trap request;

[0012] If the vehicle controller does not report a fault of low working efficiency of the selective catalytic reduction device, do not generate an automatic regeneration particulate trap request.

[0013] Optionally, after performing automatic regeneration of the particulate trap, the method further includes:

[0014] Determine whether the remaining regeneration time is greater than a preset time value;

[0015] If the remaining regeneration time is greater than the preset time value, continue to generate an automatic regeneration particulate trap request;

[0016] If the remaining regeneration time is less than or equal to the preset time value, do not generate an automatic regeneration particulate trap request.

[0017] Optionally, when performing automatic regeneration of the particulate trap, the method further includes:

[0018] Determine whether the regeneration demand status quantity is true; and,

[0019] Determine whether the regeneration start status quantity is true; and,

[0020] Determine whether the regeneration activation status quantity is true; and,

[0021] Determine whether the regeneration temperature output is higher than the regeneration temperature calibration; and,

[0022] Determine whether the output of the vehicle engine water temperature is higher than the calibrated vehicle engine water temperature;

[0023] If the regeneration demand status quantity is true, the regeneration start status quantity is true, the regeneration activation status quantity is true, the regeneration temperature output is higher than the calibrated regeneration temperature, and the vehicle engine water temperature output is higher than the calibrated vehicle engine water temperature, it is determined that the automatic regeneration of the particulate trap is successful; otherwise, it is determined that the automatic regeneration of the particulate trap fails.

[0024] Optionally, after the automatic regeneration of the particulate trap, the method further includes:

[0025] Determine whether the regeneration temperature output is higher than the calibrated regeneration temperature; and,

[0026] Determine whether the regeneration cumulative time is higher than the total calibrated regeneration time; and,

[0027] Determine whether the regeneration success status quantity is true; and,

[0028] Determine whether the regeneration remaining time status quantity is false;

[0029] If the regeneration temperature output is higher than the calibrated regeneration temperature, the regeneration cumulative time is higher than the total calibrated regeneration time, the regeneration success status quantity is true, and the regeneration remaining time status quantity is false, exit the automatic regeneration of the particulate trap; otherwise, continue the automatic regeneration of the particulate trap.

[0030] Optionally, the regeneration activation calibrated mileage is 300 kilometers.

[0031] Optionally, the regeneration activation calibrated time is 36000 seconds.

[0032] This application also provides a vehicle exhaust catalytic reduction treatment system, which includes:

[0033] An efficiency monitoring module for monitoring the working efficiency of the selective catalytic reduction device through the vehicle controller;

[0034] An automatic regeneration request module for triggering a request for automatic regeneration of the particulate trap when the vehicle controller reports a low working efficiency fault of the selective catalytic reduction device;

[0035] An automatic regeneration condition determination module for judging whether the cumulative vehicle mileage is greater than the regeneration activation calibrated mileage, whether the cumulative vehicle engine operation time is greater than the regeneration activation calibrated time, and whether the regeneration remaining time is greater than zero based on the automatic regeneration particulate trap request;

[0036] An automatic regeneration trigger module is used to perform automatic regeneration of the particulate filter when the cumulative driving mileage of the vehicle is greater than the regeneration activation calibration mileage, or when the cumulative operating time of the vehicle engine is greater than the regeneration activation calibration time, or when the remaining regeneration time is greater than zero; and to increase the temperature of the selective catalytic reduction device by using the regenerated particulate filter to improve the working efficiency of the selective catalytic reduction device.

[0037] Optionally, the system further includes a regeneration judgment module for judging whether the regeneration demand status quantity is true when performing automatic regeneration of the particulate filter; and judging whether the regeneration start status quantity is true; and judging whether the regeneration activation status quantity is true; and judging whether the regeneration temperature output is higher than the regeneration temperature calibration; and judging whether the water temperature output of the vehicle engine is higher than the vehicle engine water temperature calibration;

[0038] If the regeneration demand status quantity is true, the regeneration start status quantity is true, the regeneration activation status quantity is true, the regeneration temperature output is higher than the regeneration temperature calibration, and the water temperature output of the vehicle engine is higher than the vehicle engine water temperature calibration, it is determined that the automatic regeneration of the particulate filter is successful; otherwise, it is determined that the automatic regeneration of the particulate filter fails.

[0039] Optionally, after performing automatic regeneration of the particulate filter, the automatic regeneration trigger module further includes:

[0040] Judging whether the regeneration temperature output is higher than the regeneration temperature calibration; and,

[0041] Judging whether the regeneration cumulative time is higher than the total regeneration calibration time; and,

[0042] Judging whether the regeneration success status quantity is true; and,

[0043] Judging whether the regeneration remaining time status quantity is false;

[0044] If the regeneration temperature output is higher than the regeneration temperature calibration, the regeneration cumulative time is higher than the total regeneration calibration time, the regeneration success status quantity is true, and the regeneration remaining time status quantity is false, the automatic regeneration of the particulate filter is exited; otherwise, the automatic regeneration of the particulate filter continues.

[0045] As described above, the present application provides a vehicle exhaust gas catalytic reduction treatment method and system, having the following

[0046] Beneficial effects:

[0047] This application monitors the working efficiency of the Selective Catalytic Reduction (SCR) device through the vehicle controller, and triggers the generation of an automatic regeneration particulate trap request when the vehicle controller reports a low working efficiency fault of the SCR device; based on the automatic regeneration particulate trap request, it judges whether the cumulative driving mileage of the vehicle is greater than the regeneration activation calibration mileage, whether the cumulative operating time of the vehicle engine is greater than the regeneration activation calibration time, and whether the remaining regeneration time is greater than zero; when the cumulative driving mileage of the vehicle is greater than the regeneration activation calibration mileage, or when the cumulative operating time of the vehicle engine is greater than the regeneration activation calibration time, or when the remaining regeneration time is greater than zero, automatic regeneration of the particulate trap is carried out; the temperature of the SCR device is increased by using the automatically regenerated particulate trap to improve the working efficiency of the SCR device. It can be seen from this that this application monitors the working efficiency of the SCR device, and makes judgments according to conditions such as the engine operating state, operating time, vehicle driving mileage, water temperature, and internal temperature of the catalytic converter reducer after reporting a low working efficiency fault, activates the automatic regeneration function triggered by low SCR device efficiency, increases the exhaust temperature of the catalytic converter reducer, removes sulfides through high temperature, reduces the deposition of sulfides in the catalytic reducer, avoids the low conversion efficiency of nitrogen oxides caused by sulfur poisoning of the catalytic reducer, and effectively ensures the performance of the catalytic reducer. In addition, through the control strategy in this application, the conversion efficiency of the catalytic reducer can be monitored. When its performance deteriorates and causes a low efficiency fault of the SCR device to be reported, automatic regeneration can be triggered, and the performance of the catalytic reducer can be ensured by desulfurization at high temperature, achieving good results and ensuring the mass production of the 4K diesel national VI vehicle model project. Description of the Drawings

[0048] Figure 1 It is a schematic flow chart of a vehicle exhaust gas catalytic reduction treatment method provided by an embodiment in this application;

[0049] Figure 2 It is a schematic calibration logic diagram of automatically regenerating the particulate trap when reporting a low working efficiency fault of the SCR device provided by an embodiment in this application;

[0050] Figure 3 It is a schematic calibration logic diagram of exiting the automatically regenerating particulate trap provided by an embodiment in this application;

[0051] Figure 4 It is a schematic hardware structure diagram of a vehicle exhaust gas catalytic reduction treatment system provided by an embodiment in this application. Detailed Embodiments

[0052] The following describes the implementation manners of the present application through specific examples. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. The present application can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0053] It should be noted that the diagrams provided in this embodiment only illustrate the basic concept of the present application in a schematic manner. Therefore, only the components related to the present application are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and proportion of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0054] Please refer to Figure 1 As shown, this embodiment provides a method for catalytic reduction treatment of vehicle exhaust gas, including the following steps:

[0055] S110, monitor the working efficiency of the selective catalytic reduction device through the vehicle controller, and trigger the generation of an automatic regeneration particulate filter request when the vehicle controller reports a low working efficiency fault of the selective catalytic reduction device;

[0056] S120, based on the automatic regeneration particulate filter request, judge whether the cumulative driving mileage of the vehicle is greater than the regeneration activation calibration mileage, whether the cumulative running time of the vehicle engine is greater than the regeneration activation calibration time, and whether the remaining regeneration time is greater than zero. As an example, the regeneration activation calibration mileage and the regeneration activation calibration time in this embodiment can be set according to the actual situation. For example, the regeneration activation calibration mileage can be set to 300 kilometers, and the regeneration activation calibration time can be set to 36000 seconds.

[0057] S130, when the cumulative driving mileage of the vehicle is greater than the regeneration activation calibration mileage, or when the cumulative running time of the vehicle engine is greater than the regeneration activation calibration time, or when the remaining regeneration time is greater than zero, perform automatic regeneration of the particulate filter;

[0058] S140, use the automatically regenerated particulate filter to increase the temperature of the selective catalytic reduction device to improve the working efficiency of the selective catalytic reduction device.

[0059] It can be seen from this that in this embodiment, by monitoring the working efficiency of the selective catalytic reduction device (SCR), and making a judgment according to conditions such as the engine operating state, operating time, vehicle driving mileage, water temperature, and the internal temperature of the catalytic converter reducer after a low working efficiency fault is reported, the automatic regeneration function triggered by the low efficiency of the selective catalytic reduction device (SCR) is enabled to increase the exhaust gas temperature of the catalytic converter reducer, remove sulfides through high temperature, reduce the deposition of sulfides in the catalytic reducer, avoid the low conversion efficiency of nitrogen oxides caused by sulfur poisoning of the catalytic reducer, and effectively ensure the performance of the catalytic reducer. In addition, through the control strategy in this embodiment, the conversion efficiency of the catalytic reducer can be monitored. When its performance deteriorates and a low efficiency fault of the selective catalytic reduction device (SCR) is reported, automatic regeneration can be triggered, and the performance of the catalytic reducer can be ensured by removing sulfur with high temperature, achieving good results and ensuring the mass production of the 4K diesel national VI vehicle project.

[0060] In an exemplary embodiment, in step S130, after the automatic regeneration of the particulate filter, it may further include: determining whether the vehicle controller continuously reports a low working efficiency fault of the selective catalytic reduction device; if the vehicle controller continuously reports a low working efficiency fault of the selective catalytic reduction device, then continue to generate a request for automatic regeneration of the particulate filter; if the vehicle controller does not report a low working efficiency fault of the selective catalytic reduction device, then do not generate a request for automatic regeneration of the particulate filter.

[0061] In an exemplary embodiment, in step S130, after the automatic regeneration of the particulate filter, it may further include: determining whether the remaining regeneration time is greater than a preset time value; if the remaining regeneration time is greater than the preset time value, then continue to generate a request for automatic regeneration of the particulate filter; if the remaining regeneration time is less than or equal to the preset time value, then do not generate a request for automatic regeneration of the particulate filter. As an example, the preset time value in this embodiment can be set according to the actual situation. For example, the preset time value can be set to 1500 seconds.

[0062] In an exemplary embodiment, when performing the automatic regeneration of the particulate filter, this embodiment may further include: determining whether the regeneration demand state quantity is true; and determining whether the regeneration start state quantity is true; and determining whether the regeneration activation state quantity is true; and determining whether the regeneration temperature output is higher than the regeneration temperature calibration; and determining whether the vehicle engine water temperature output is higher than the vehicle engine water temperature calibration; if the regeneration demand state quantity is true, the regeneration start state quantity is true, the regeneration activation state quantity is true, the regeneration temperature output is higher than the regeneration temperature calibration, and the vehicle engine water temperature output is higher than the vehicle engine water temperature calibration, then it is determined that the automatic regeneration of the particulate filter is successful; otherwise, it is determined that the automatic regeneration of the particulate filter fails. Specifically, such as Figure 3As shown, if the regeneration demand status quantity is true, the regeneration start status quantity is true, the regeneration activation status quantity is true, the regeneration temperature output is higher than the regeneration temperature calibration, and the engine water temperature output is higher than the engine water temperature calibration, it is determined that the regeneration is successful. At Figure 3 PFltRgn_stSCRRgnRegSet represents the regeneration demand status quantity; PFltRgn_tiRmnRgnSCR represents the remaining regeneration time; PFItRgn_tiRgnSCR_C represents the total regeneration calibration time; PFltRgn_tiRmnRgnSCR represents the remaining regeneration time; stRgnActvStrt represents the regeneration start status quantity; PFltRgn_stTmrRmnRgnSCR represents the remaining regeneration time status quantity; PFltRgn_stRgnActv represents the regeneration activation status quantity; tPFltUsSCR represents the regeneration temperature output; PFltRgn_tThdPFltUsSCR_C represents the regeneration temperature calibration; CEngDsT_t represents the engine water temperature output; PFltRgn_tThdCEngDstSCR_C represents the engine water temperature calibration; PFItRgn_stSuc represents the regeneration success status quantity; PFltRgn_mskSCRRgnSuc_C represents the regeneration status calibration.

[0063] In an exemplary embodiment, after the automatic regeneration of the particulate filter, this embodiment further includes: determining whether the regeneration temperature output is higher than the regeneration temperature calibration; and determining whether the cumulative regeneration time is higher than the total regeneration calibration time; and determining whether the regeneration success status quantity is true; and determining whether the remaining regeneration time status quantity is false; when the regeneration temperature output is higher than the regeneration temperature calibration, the cumulative regeneration time is higher than the total regeneration calibration time, the regeneration success status quantity is true, and the remaining regeneration time status quantity is false, the automatic regeneration of the particulate filter is exited; otherwise, the automatic regeneration of the particulate filter continues. Specifically, as Figure 3 shown, if the regeneration output temperature is higher than the regeneration calibration temperature, the cumulative time is higher than the total regeneration calibration time, the regeneration success status quantity is true, and the remaining regeneration time status quantity is false, the automatic regeneration of the particulate filter is exited.

[0064] In another exemplary embodiment of the present application, the present application further provides a method for catalytic reduction treatment of vehicle exhaust gas, including the following steps:

[0065] Monitor the working efficiency of the selective catalytic reduction device through the vehicle controller, and when the following conditions are met, a low SCR efficiency triggers the opening of a request for the automatic regeneration function.

[0066] Condition 1: Conditions for calling the automatic regeneration function triggered by low SCR efficiency:

[0067] 1-a. The vehicle controller detects a low SCR efficiency fault and calls the automatic regeneration function for this fault FID.

[0068] Condition 2: Conditions for activating the automatic regeneration function triggered by low SCR efficiency:

[0069] 2-a. After the low SCR efficiency fault is detected, the cumulative driving mileage of the vehicle exceeds a threshold value (300 km).

[0070] 2-b. After the low SCR efficiency fault is detected, the engine running time exceeds a threshold value (36,000 s).

[0071] 2-c. The coolant temperature is higher than a threshold value (60 °C).

[0072] Among them, it is sufficient to meet one of the conditions a and b in Condition ②.

[0073] Meanwhile, when the following conditions are met, the request for activating the automatic regeneration function triggered by low SCR efficiency is closed.

[0074] 3-a. The vehicle controller detects that the low SCR efficiency fault has been repaired.

[0075] 3-b. The regeneration time is higher than a threshold value (1500 s).

[0076] Specifically, when the low SCR efficiency fault is detected, the ECU immediately calls the regeneration function. The ECU starts recording the cumulative driving mileage of the vehicle and the cumulative engine running time from zero. When any one of the following three conditions is met: the cumulative driving mileage of the vehicle is greater than the calibrated mileage for regeneration activation, the cumulative engine running time is greater than the calibrated time for regeneration activation, and the remaining regeneration time is greater than zero, the regeneration function is immediately activated. At this time, the regeneration demand status variable becomes true, indicating that the regeneration function has been activated. In addition, the ECU displays the regeneration process status by real-time monitoring of the input variables such as the start and success status variables of regeneration, the regeneration activation status variable, the regeneration temperature, and the engine water temperature. Among them, the calibration logic of this embodiment is as Figure 2 shown. In Figure 2Among them, DSM FidType indicates the call of the regeneration function; PFItRgn_stSCRRgnReqSet indicates the regeneration demand status quantity; PFItRgn_stSCREffLoRgnReq indicates the regeneration process status; PFltRgn_ISnceRgn indicates the cumulative vehicle mileage; PFltRgn_ISnceRgnSCRMax_C indicates the regeneration activation mileage calibration; PFltRgn_tiSnceRgn indicates the cumulative engine running time; PFItRgn_tiSnceRgnSCRMax_C indicates the regeneration activation time calibration; PFtPgnFRmPgnSCR indicates the remaining regeneration time; stRgnActvStrt indicates the regeneration start status quantity; PFItRgn_stSuc indicates the regeneration success status quantity; PFltRgn_stRgnActv indicates the regeneration activation status quantity; tPFItUsSCR indicates the regeneration temperature; CEngDsT_t indicates the regeneration engine water temperature.

[0077] In summary, the present application provides a method for catalytic reduction treatment of vehicle exhaust. The vehicle controller monitors the working efficiency of the selective catalytic reduction device SCR, and when the vehicle controller reports a low working efficiency fault of the selective catalytic reduction device SCR, it triggers the generation of an automatic regeneration particulate filter request; based on the automatic regeneration particulate filter request, it judges whether the cumulative vehicle mileage is greater than the regeneration activation calibration mileage, whether the cumulative running time of the vehicle engine is greater than the regeneration activation calibration time, and whether the remaining regeneration time is greater than zero; when the cumulative vehicle mileage is greater than the regeneration activation calibration mileage, or when the cumulative running time of the vehicle engine is greater than the regeneration activation calibration time, or when the remaining regeneration time is greater than zero, the automatic regeneration of the particulate filter is carried out; the temperature of the selective catalytic reduction device is increased by using the automatically regenerated particulate filter to improve the working efficiency of the selective catalytic reduction device. It can be seen from this that this method monitors the working efficiency of the selective catalytic reduction device SCR, and after reporting a low working efficiency fault, it makes judgments according to conditions such as the engine operating state, running time, vehicle mileage, water temperature, and internal temperature of the catalytic converter reducer, and activates the automatic regeneration function triggered by the low efficiency of the selective catalytic reduction device SCR, increases the exhaust temperature of the catalytic converter reducer, removes sulfides through high temperature, reduces the deposition of sulfides in the catalytic reducer, and avoids the low conversion efficiency of nitrogen oxides caused by sulfur poisoning of the catalytic reducer, effectively ensuring the performance of the catalytic reducer. In addition, through the control strategy in this method, the conversion efficiency of the catalytic reducer can be monitored. When its performance deteriorates and causes a low efficiency fault of the selective catalytic reduction device SCR to be reported, automatic regeneration can be triggered, and the performance of the catalytic reducer can be ensured by removing sulfur at high temperature, achieving good results and ensuring the mass production of the 4K diesel national VI vehicle model project.

[0078] Such asFigure 4 As shown in the figure, the present application also provides a vehicle exhaust catalytic reduction treatment system, which includes:

[0079] An efficiency monitoring module 410, configured to monitor the working efficiency of the selective catalytic reduction device through a vehicle controller;

[0080] An automatic regeneration request module 420, configured to trigger and generate an automatic regeneration particulate filter request when the vehicle controller reports a low working efficiency fault of the selective catalytic reduction device. As an example, the regeneration activation calibration mileage and regeneration activation calibration time in this embodiment can be set according to the actual state. For example, the regeneration activation calibration mileage can be set to 300 kilometers, and the regeneration activation calibration time can be set to 36,000 seconds.

[0081] An automatic regeneration condition determination module 430, configured to determine based on the automatic regeneration particulate filter request whether the cumulative vehicle mileage is greater than the regeneration activation calibration mileage, whether the cumulative engine operation time of the vehicle is greater than the regeneration activation calibration time, and whether the remaining regeneration time is greater than zero;

[0082] An automatic regeneration trigger module 440, configured to perform automatic regeneration of the particulate filter when the cumulative vehicle mileage is greater than the regeneration activation calibration mileage, or when the cumulative engine operation time of the vehicle is greater than the regeneration activation calibration time, or when the remaining regeneration time is greater than zero; and use the automatically regenerated particulate filter to increase the temperature of the selective catalytic reduction device to improve the working efficiency of the selective catalytic reduction device.

[0083] It can be seen from this that in this embodiment, by monitoring the working efficiency of the selective catalytic reduction device SCR, and making judgments according to conditions such as the engine operation state, operation time, vehicle mileage, water temperature, and internal temperature of the catalytic converter reducer after reporting a low working efficiency fault, the automatic regeneration function triggered by the low efficiency of the selective catalytic reduction device SCR is enabled, the exhaust temperature of the catalytic converter reducer is increased, sulfides are removed by high temperature, the deposition of sulfides in the catalytic reducer is reduced, and the low conversion efficiency of nitrogen oxides caused by sulfur poisoning of the catalytic reducer is avoided, effectively ensuring the performance of the catalytic reducer. In addition, through the control strategy in this embodiment, the conversion efficiency of the catalytic reducer can be monitored. When its performance deteriorates and a low efficiency fault of the selective catalytic reduction device SCR is reported, automatic regeneration can be triggered, and the performance of the catalytic reducer can be ensured by desulfurization at high temperature, achieving good results and ensuring the mass production of the 4K diesel national VI vehicle model project.

[0084] In an exemplary embodiment, the system further includes a regeneration judgment module, which is configured to, when performing automatic regeneration of the particulate filter, judge whether the regeneration demand status quantity is true; and, judge whether the regeneration start status quantity is true; and, judge whether the regeneration activation status quantity is true; and, judge whether the regeneration temperature output is higher than the regeneration temperature calibration; and, judge whether the vehicle engine water temperature output is higher than the vehicle engine water temperature calibration; if the regeneration demand status quantity is true, the regeneration start status quantity is true, the regeneration activation status quantity is true, the regeneration temperature output is higher than the regeneration temperature calibration, and the vehicle engine water temperature output is higher than the vehicle engine water temperature calibration, it is determined that the automatic regeneration of the particulate filter is successful; otherwise, it is determined that the automatic regeneration of the particulate filter fails.

[0085] In an exemplary embodiment, after performing automatic regeneration of the particulate filter, it further includes: judging whether the regeneration temperature output is higher than the regeneration temperature calibration; and, judging whether the regeneration cumulative time is higher than the total regeneration calibration time; and, judging whether the regeneration success status quantity is true; and, judging whether the regeneration remaining time status quantity is false; if the regeneration temperature output is higher than the regeneration temperature calibration, the regeneration cumulative time is higher than the total regeneration calibration time, the regeneration success status quantity is true, and the regeneration remaining time status quantity is false, the automatic regeneration of the particulate filter is exited; otherwise, the automatic regeneration of the particulate filter continues. Specifically, as Figure 3 shown, if the regeneration demand status quantity is true, the regeneration start status quantity is true, the regeneration activation status quantity is true, the regeneration temperature output is higher than the regeneration temperature calibration, and the engine water temperature output is higher than the engine water temperature calibration, it is judged that the regeneration is successful. In Figure 3 , PFltRgn_stSCRRgnRegSet represents the regeneration demand status quantity; PFltRgn_tiRmnRgnSCR represents the regeneration remaining time; PFItRgn_tiRgnSCR_C represents the total regeneration calibration time; PFltRgn_tiRmnRgnSCR represents the regeneration remaining time; stRgnActvStrt represents the regeneration start status quantity; PFltRgn_stTmrRmnRgnSCR represents the regeneration remaining time status quantity; PFltRgn_stRgnActv represents the regeneration activation status quantity; tPFltUsSCR represents the regeneration temperature output; PFltRgn_tThdPFltUsSCR_C represents the regeneration temperature calibration; CEngDsT_t represents the engine water temperature output; PFltRgn_tThdCEngDstSCR_C represents the engine water temperature calibration; PFItRgn_stSuc represents the regeneration success status quantity; PFltRgn_mskSCRRgnSuc_C represents the regeneration status calibration.

[0086] In an exemplary embodiment, after the automatic regeneration of the particulate filter, this embodiment further includes: determining whether the output of the regeneration temperature is higher than the calibrated regeneration temperature; and determining whether the cumulative regeneration time is higher than the total calibrated regeneration time; and determining whether the regeneration success status quantity is true; and determining whether the regeneration remaining time status quantity is false; if the output of the regeneration temperature is higher than the calibrated regeneration temperature, the cumulative regeneration time is higher than the total calibrated regeneration time, the regeneration success status quantity is true, and the regeneration remaining time status quantity is false, then exit the automatic regeneration of the particulate filter; otherwise, continue the automatic regeneration of the particulate filter. Specifically, as Figure 3 shown, if the regeneration output temperature is higher than the calibrated regeneration temperature, the cumulative time is higher than the total calibrated regeneration time, the regeneration success status quantity is true, and the regeneration remaining time status quantity is false, then exit the automatic regeneration of the particulate filter.

[0087] In summary, the present application provides a vehicle exhaust catalytic reduction treatment system, which monitors the working efficiency of the selective catalytic reduction device SCR through a vehicle controller, and triggers a request for automatically regenerating the particulate filter when the vehicle controller reports a low working efficiency fault of the selective catalytic reduction device SCR; based on the request for automatically regenerating the particulate filter, determine whether the cumulative vehicle mileage is greater than the calibrated regeneration activation mileage, and determine whether the cumulative engine operation time of the vehicle is greater than the calibrated regeneration activation time, and determine whether the remaining regeneration time is greater than zero; when the cumulative vehicle mileage is greater than the calibrated regeneration activation mileage, or when the cumulative engine operation time of the vehicle is greater than the calibrated regeneration activation time, or when the remaining regeneration time is greater than zero, perform the automatic regeneration of the particulate filter; use the automatically regenerated particulate filter to increase the temperature of the selective catalytic reduction device to improve the working efficiency of the selective catalytic reduction device. It can be seen from this that this system monitors the working efficiency of the selective catalytic reduction device SCR, and makes judgments according to conditions such as the engine operation state, operation time, vehicle mileage, water temperature, and internal temperature of the catalytic reducer after reporting a low working efficiency fault, activates the automatic regeneration function triggered by the low efficiency of the selective catalytic reduction device SCR, increases the exhaust temperature of the catalytic reducer, removes sulfides through high temperature, reduces the deposition of sulfides in the catalytic reducer, avoids the low conversion efficiency of nitrogen oxides caused by sulfur poisoning of the catalytic reducer, and effectively ensures the performance of the catalytic reducer. In addition, through the control strategy in this system, the conversion efficiency of the catalytic reducer can be monitored. When its performance deteriorates and causes a low efficiency fault of the selective catalytic reduction device SCR to be reported, automatic regeneration can be triggered, and high temperature desulfurization can be used to ensure the performance of the catalytic reducer, achieving good results and ensuring the mass production of the 4K diesel national VI vehicle model project.

[0088] It should be noted that the vehicle exhaust catalytic reduction treatment system provided by the above embodiments and the vehicle exhaust catalytic reduction treatment method provided by the above embodiments belong to the same concept. The specific ways in which each module and unit perform operations have been described in detail in the method embodiments, and will not be elaborated here. In practical applications, the vehicle exhaust catalytic reduction treatment system provided by the above embodiments can, as needed, allocate the above functions to different functional modules, that is, divide the internal structure of the system into different functional modules to complete all or part of the functions described above, and this will not be limited here. Therefore, this application effectively overcomes various drawbacks in the prior art and has high industrial utilization value.

[0089] The above embodiments are only illustrative of the principles and effects of this application and are not used to limit this application. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in this application should still be covered by the claims of this application.

[0090] It should be understood that although terms such as first, second, and third may be used in the embodiments of this application to describe preset ranges, etc., these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from each other. For example, without departing from the scope of the embodiments of this application, the first preset range can also be referred to as the second preset range, and similarly, the second preset range can also be referred to as the first preset range.

Claims

1. A method for catalytic reduction treatment of vehicle exhaust gas, characterized in that, the method comprises the following steps: Monitoring the working efficiency of the selective catalytic reduction device by a vehicle controller, and triggering a request for automatic regeneration of the particulate filter when the vehicle controller reports a low working efficiency fault of the selective catalytic reduction device; Based on the request for automatic regeneration of the particulate filter, judging whether the cumulative driving mileage of the vehicle is greater than the regeneration activation calibration mileage, judging whether the cumulative running time of the vehicle engine is greater than the regeneration activation calibration time, and judging whether the remaining regeneration time is greater than zero; When the cumulative driving mileage of the vehicle is greater than the regeneration activation calibration mileage, or when the cumulative running time of the vehicle engine is greater than the regeneration activation calibration time, or when the remaining regeneration time is greater than zero, perform automatic regeneration of the particulate filter; Use the automatically regenerated particulate filter to increase the temperature of the selective catalytic reduction device to improve the working efficiency of the selective catalytic reduction device; After performing automatic regeneration of the particulate filter, the method further comprises: judging whether the vehicle controller continuously reports a low working efficiency fault of the selective catalytic reduction device; if the vehicle controller continuously reports a low working efficiency fault of the selective catalytic reduction device, continue to generate a request for automatic regeneration of the particulate filter; if the vehicle controller does not report a low working efficiency fault of the selective catalytic reduction device, do not generate a request for automatic regeneration of the particulate filter; When performing automatic regeneration of the particulate filter, the method further comprises: judging whether the regeneration demand status quantity is true; and judging whether the regeneration start status quantity is true; and judging whether the regeneration activation status quantity is true; and judging whether the regeneration temperature output is higher than the regeneration temperature calibration; and judging whether the water temperature output of the vehicle engine is higher than the vehicle engine water temperature calibration; if the regeneration demand status quantity is true, the regeneration start status quantity is true, the regeneration activation status quantity is true, the regeneration temperature output is higher than the regeneration temperature calibration, and the water temperature output of the vehicle engine is higher than the vehicle engine water temperature calibration, then determine that the automatic regeneration of the particulate filter is successful; otherwise, determine that the automatic regeneration of the particulate filter fails.

2. The method for catalytic reduction treatment of vehicle exhaust gas according to claim 1, characterized in that, after performing automatic regeneration of the particulate filter, the method further comprises: judging whether the remaining regeneration time is greater than a preset time value; if the remaining regeneration time is greater than the preset time value, continue to generate a request for automatic regeneration of the particulate filter; if the remaining regeneration time is less than or equal to the preset time value, do not generate a request for automatic regeneration of the particulate filter.

3. The method for catalytic reduction treatment of vehicle exhaust gas according to claim 1, characterized in that, after performing automatic regeneration of the particulate filter, the method further comprises: judging whether the regeneration temperature output is higher than the regeneration temperature calibration; and, judging whether the cumulative regeneration time is higher than the total regeneration calibration time; and, judging whether the regeneration success status quantity is true; and, judging whether the remaining regeneration time status quantity is false; When the regeneration temperature output is higher than the regeneration temperature calibration, the regeneration cumulative time is higher than the total regeneration calibration time, the regeneration success status quantity is true, and the regeneration remaining time status quantity is false, the automatic regeneration of the particulate trap is exited; otherwise, the automatic regeneration of the particulate trap continues.

4. The vehicle exhaust catalytic reduction treatment method according to claim 1, characterized in that the regeneration activation calibration mileage is 300 kilometers.

5. The vehicle exhaust catalytic reduction treatment method according to claim 1, characterized in that the regeneration activation calibration time is 36000 seconds.

6. A vehicle exhaust catalytic reduction treatment system applied to the vehicle exhaust catalytic reduction treatment method according to any one of claims 1 to 5, characterized in that the system includes: an efficiency monitoring module for monitoring the working efficiency of the selective catalytic reduction device through a vehicle controller; an automatic regeneration request module for triggering and generating an automatic regeneration particulate trap request when the vehicle controller reports a low working efficiency fault of the selective catalytic reduction device; an automatic regeneration condition determination module for judging whether the cumulative mileage of the vehicle is greater than the regeneration activation calibration mileage, judging whether the cumulative running time of the vehicle engine is greater than the regeneration activation calibration time, and judging whether the regeneration remaining time is greater than zero based on the automatic regeneration particulate trap request; an automatic regeneration trigger module for performing automatic regeneration of the particulate trap when the cumulative mileage of the vehicle is greater than the regeneration activation calibration mileage, or when the cumulative running time of the vehicle engine is greater than the regeneration activation calibration time, or when the regeneration remaining time is greater than zero; and using the automatically regenerated particulate trap to increase the temperature of the selective catalytic reduction device to improve the working efficiency of the selective catalytic reduction device.

7. The vehicle exhaust catalytic reduction treatment system according to claim 6, characterized in that the system further includes a regeneration judgment module for judging whether the regeneration demand status quantity is true when performing automatic regeneration of the particulate trap; and judging whether the regeneration start status quantity is true; and judging whether the regeneration activation status quantity is true; and judging whether the regeneration temperature output is higher than the regeneration temperature calibration; and judging whether the vehicle engine water temperature output is higher than the vehicle engine water temperature calibration; If the regeneration demand status quantity is true, the regeneration start status quantity is true, the regeneration activation status quantity is true, the regeneration temperature output is higher than the regeneration temperature calibration, and the vehicle engine water temperature output is higher than the vehicle engine water temperature calibration, then it is determined that the automatic regeneration of the particulate trap is successful; otherwise, it is determined that the automatic regeneration of the particulate trap fails.

8. The vehicle exhaust catalytic reduction treatment system according to claim 6, characterized in that after performing automatic regeneration of the particulate trap, the automatic regeneration trigger module further includes: judging whether the regeneration temperature output is higher than the regeneration temperature calibration; and judging whether the regeneration cumulative time is higher than the total regeneration calibration time; and judging whether the regeneration success status quantity is true; and judging whether the regeneration remaining time status quantity is false; When the regeneration temperature output is higher than the calibrated regeneration temperature, the cumulative regeneration time is higher than the total calibrated regeneration time, the regeneration success status is true, and the remaining regeneration time status is false, the automatic regeneration of the particulate filter is terminated; otherwise, the automatic regeneration of the particulate filter continues.

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