Engine control system, control method, and vehicle

Abstract

The application relates to an engine control system, a control method and a vehicle, wherein the control system comprises: an exhaust sensor configured to detect gas information in an exhaust pipeline of the vehicle; and a controller configured to control the engine of the vehicle to switch between a rich combustion mode and a lean combustion mode according to the gas information detected by the exhaust sensor. The application has the beneficial effect of providing an effective switching control method by detecting the gas information in the exhaust pipeline of the vehicle, so that the duration of the rich combustion mode and the lean combustion mode is balanced.

Description

Technical Field

[0001] This application relates to the field of engine control technology, and in particular to an engine control system, control method and vehicle. Background Technology

[0002] In lean-burn mode, the engine consumes less fuel, but the concentration of nitrogen oxides in the exhaust gas cannot be controlled. The active selective catalytic reduction (ACR) neutralizes nitrogen oxides by injecting urea to produce ammonia. This method is costly and complicated to maintain.

[0003] Among the related technologies, a passive selective catalytic reduction device has been proposed, which utilizes the ammonia generated by the three-way catalytic converter in the rich combustion mode of the engine to store it first, and then uses it to neutralize nitrogen oxides in the lean combustion mode of the engine to produce harmless exhaust gas.

[0004] However, no suitable control scheme has been provided in the relevant technologies to effectively control the timing of switching between rich combustion mode and lean combustion mode. Summary of the Invention

[0005] This application provides an engine control system to at least partially solve the above-mentioned technical problems.

[0006] To achieve the above objectives, according to a first aspect of this application, an engine control system is provided, comprising:

[0007] The exhaust gas sensor is configured to detect gas information in the vehicle's exhaust pipe.

[0008] The controller is configured to control the vehicle's engine to switch between rich combustion mode and lean combustion mode based on the gas information detected by the exhaust gas sensor.

[0009] Optionally, in some embodiments of this application, the exhaust gas sensor is configured to detect gas information other than that of the SCR device.

[0010] Optionally, in some embodiments of this application, the gas information includes: concentration information.

[0011] Optionally, in some embodiments of this application, the controller is configured to control the timing of the engine switching to rich combustion mode and / or lean combustion mode based on the change of the concentration information over time.

[0012] Optionally, in some embodiments of this application, the controller is configured to obtain the calibration ammonia storage capacity parameters and calibration reaction parameters of the SCR device based on the changes in the concentration information; and the controller is configured to control the timing of the engine switching to rich combustion mode and / or lean combustion mode based on the calibration ammonia storage capacity parameters and calibration reaction parameters.

[0013] Optionally, in some embodiments of this application, the exhaust gas sensor includes:

[0014] A post-mounted nitrogen and oxygen sensor is used to detect gaseous information of nitrogen and oxygen compounds leaving the SCR device;

[0015] The controller is configured to obtain the calibration ammonia storage capacity parameters and the calibration reaction parameters based on the gas information detected by the post-nitrogen oxygen sensor.

[0016] Optionally, in some embodiments of this application, the controller is configured to obtain real-time ammonia storage capacity parameters of the SCR device based on changes in the concentration information; and the controller is configured to control the timing of the engine switching to rich combustion mode and / or lean combustion mode based on the real-time ammonia storage capacity parameters.

[0017] Optionally, in some embodiments of this application, the exhaust gas sensor includes:

[0018] A post-mounted nitrogen and oxygen sensor is used to detect gaseous information of nitrogen and oxygen compounds leaving the SCR device;

[0019] The controller is configured to control the timing of the engine switching to rich combustion mode based on the gas information detected by the rear nitrogen-oxygen sensor.

[0020] Optionally, in some embodiments of this application, the controller is configured to obtain the calibration ammonia storage capacity parameters of the SCR device based on the gas information detected by the post-nitrogen oxygen sensor.

[0021] Furthermore, the controller is configured to control the timing of the engine switching to the lean-burn mode based on the calibrated ammonia storage capacity parameters.

[0022] Optionally, in some embodiments of this application, the engine control system includes a plurality of exhaust gas sensors to enable the plurality of exhaust gas sensors to detect gas information of exhaust gas entering the SCR device or gas information of exhaust gas leaving the SCR device.

[0023] Optionally, in some embodiments of this application, the exhaust gas sensor includes:

[0024] An ammonia sensor is used to detect the gas information of ammonia entering the SCR device;

[0025] The controller is configured to control the timing of the engine switching to lean-burn mode based on the gas information detected by the ammonia sensor.

[0026] Optionally, in some embodiments of this application, the exhaust gas sensor includes:

[0027] A pre-mounted nitrogen and oxygen sensor is used to detect the gaseous information of nitrogen and oxygen compounds entering the SCR device;

[0028] The controller is configured to control the timing of the engine switching to rich combustion mode based on the gas information detected by the front nitrogen-oxygen sensor.

[0029] Optionally, in some embodiments of this application, the exhaust gas sensor further includes:

[0030] An ammonia sensor is used to detect the gas information of ammonia entering the SCR device;

[0031] A pre-mounted nitrogen and oxygen sensor is used to detect the gaseous information of nitrogen and oxygen compounds entering the SCR device;

[0032] A post-mounted nitrogen and oxygen sensor is used to detect gaseous information of nitrogen and oxygen compounds leaving the SCR device;

[0033] The controller is configured to obtain the calibration ammonia storage capacity parameters and calibration reaction parameters of the SCR device based on the gas information detected by the post-nitrogen oxygen sensor.

[0034] Furthermore, the controller is configured to control the timing of the engine switching to rich combustion mode and / or lean combustion mode based on the calibration reaction parameters, calibration ammonia storage capacity parameters, and gas information detected by the ammonia sensor and the pre-nitrogen oxygen sensor.

[0035] According to a second aspect of this application, an engine control method is provided, comprising:

[0036] The system controls the vehicle's engine to switch between rich and lean combustion modes based on the gas information in the vehicle's exhaust pipe.

[0037] Optionally, in some embodiments of this application, the gas information is gas information other than that of the SCR device.

[0038] Optionally, in some embodiments of this application, the gas information includes: concentration information.

[0039] Optionally, in some embodiments of this application, the step of controlling the vehicle's engine to switch to rich combustion mode or lean combustion mode based on gas information in the vehicle's exhaust pipe includes:

[0040] The timing of the engine switching to rich combustion mode and / or lean combustion mode is determined based on the change of the concentration information over time.

[0041] Optionally, in some embodiments of this application, determining the time point for the engine to switch to rich combustion mode and / or lean combustion mode based on the change of the concentration information over time includes:

[0042] Based on the changes in the concentration information, the calibration ammonia storage capacity parameters and calibration reaction parameters of the SCR equipment are obtained;

[0043] The timing for switching the engine to rich combustion mode or lean combustion mode is determined based on the calibration ammonia storage capacity parameters and calibration reaction parameters.

[0044] Optionally, in some embodiments of this application, determining the time point for the engine to switch to rich combustion mode and / or lean combustion mode based on the change of the concentration information over time includes:

[0045] The real-time ammonia storage capacity parameters of the SCR device are obtained based on the changes in the concentration information.

[0046] The timing for switching the engine to the rich combustion mode or the lean combustion mode is determined based on the real-time ammonia storage capacity parameters.

[0047] Optionally, in some embodiments of this application, determining the time point for the engine to switch to rich combustion mode and / or lean combustion mode based on the change of the concentration information over time includes:

[0048] When the concentration of nitrogen oxides leaving the SCR device reaches a preset nitrogen oxide concentration threshold, the vehicle's engine is controlled to switch to rich combustion mode.

[0049] Optionally, in some embodiments of this application, determining the time point for the engine to switch to rich combustion mode and / or lean combustion mode based on the change of the concentration information over time includes:

[0050] The calibration ammonia storage capacity parameters of the SCR device are obtained based on the gas information of nitrogen oxides leaving the SCR device;

[0051] The timing of switching the engine to the lean-burn mode is determined based on the calibrated ammonia storage capacity parameters.

[0052] Optionally, in some embodiments of this application, the gas information includes gas information of the exhaust gas entering the SCR device and / or gas information of the exhaust gas leaving the SCR device.

[0053] Optionally, in some embodiments of this application, determining the time point for the engine to switch to rich combustion mode and / or lean combustion mode based on the change of the concentration information over time includes:

[0054] The timing of the engine switching to lean-burn mode is determined based on the ammonia concentration information entering the SCR device; and / or

[0055] The timing of the engine switching to rich combustion mode is determined based on the concentration information of nitrogen oxides entering the SCR device.

[0056] Optionally, in some embodiments of this application, determining the time point for the engine to switch to rich combustion mode and / or lean combustion mode based on the change of the concentration information over time includes:

[0057] The calibration ammonia storage capacity parameters and calibration reaction parameters of the SCR device are obtained based on the concentration information of nitrogen oxides leaving the SCR device.

[0058] The timing for the engine to switch to rich combustion mode or lean combustion mode is determined based on the calibration reaction parameters, calibration ammonia storage capacity parameters, and the concentration information of ammonia and nitrogen oxides entering the SCR device.

[0059] According to a third aspect of this application, a non-transitory computer-readable storage medium is also provided, on which a computer program is stored, which, when executed by a processor, implements the engine control method as described above.

[0060] According to a fourth aspect of this application, a computer program product is also provided, comprising a computer program that, when executed by a processor, implements the engine control method as described above.

[0061] According to a fifth aspect of this application, an electronic device is also provided, the electronic device comprising:

[0062] A memory that stores computer programs;

[0063] A processor is configured to execute the computer program in the memory to implement the engine control method described above.

[0064] According to a sixth aspect of this application, a vehicle is also provided, comprising: an engine control system as described above, or a computer-readable storage medium as described above, or a computer program product as described above, or an electronic device as described above.

[0065] In the engine control system of this application embodiment, a more effective switching control method is provided by detecting gas information in the vehicle exhaust pipe, thereby balancing the duration of rich combustion mode and lean combustion mode.

[0066] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0067] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0068] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0069] Figure 1 This is a schematic diagram of the exhaust gas treatment system controlled by the engine control system provided in an exemplary embodiment of this application;

[0070] Figure 2 This is a schematic diagram of an engine control system provided in an exemplary embodiment of this application;

[0071] Figure 3 This is a schematic diagram of an exhaust gas treatment system controlled by another engine control system provided in an exemplary embodiment of this application;

[0072] Figure 4 This is a schematic diagram of another engine control system provided in an exemplary embodiment of this application;

[0073] Figure 5 This is a schematic diagram of the first part of the steps in the engine control method provided in the exemplary embodiment of this application;

[0074] Figure 6 This is a schematic diagram of the second part of the steps in the engine control method provided in an exemplary embodiment of this application;

[0075] Figure 7 This is a schematic diagram of the third part of the engine control method provided in an exemplary embodiment of this application;

[0076] Figure 8 This is a schematic diagram of the fourth step in the engine control method provided in the exemplary embodiment of this application.

[0077] Figure 9 This is a schematic diagram of the fifth step in the engine control method provided in an exemplary embodiment of this application;

[0078] Figure 10 This is a schematic diagram of the sixth sub-step in the engine control method provided in the exemplary embodiment of this application;

[0079] Figure 11 This is a schematic diagram of an electronic device provided in an exemplary embodiment of this application;

[0080] Figure 12 This is a schematic diagram of a vehicle provided in an exemplary embodiment of this application.

[0081] Explanation of reference numerals in the attached figures:

[0082] 10. Vehicles;

[0083] 100. Control system;

[0084] 110. Controller; 120. Post-nitrogen / oxygen sensor; 130. Pre-nitrogen / oxygen sensor; 140. Ammonia sensor;

[0085] 200. Exhaust gas treatment system;

[0086] 210. Engine; 220. Exhaust pipe; 230. Three-way catalytic converter; 240. SCR equipment. Detailed Implementation

[0087] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0088] According to the first aspect of this application, referring to Figure 1 This application provides an engine 210 control system 100 for controlling the engine 210 of vehicle 10 to switch between rich combustion mode and lean combustion mode.

[0089] To facilitate understanding of the technical solution of this application, a vehicle exhaust gas treatment system 200 is first introduced, referring to... Figure 1 As shown, the vehicle's exhaust aftertreatment system 200 includes an engine 210, an exhaust pipe 220, a three-way catalytic converter 230, and a passive selective catalytic reduction (PSCR). The vehicle's exhaust pipe 220 is connected to the exhaust port of the engine 210 and is sequentially connected to the three-way catalytic converter 230 (TWC) and the passive selective catalytic reduction (PSCR).

[0090] It should be noted that the combustion modes of the Engine 210 are divided into rich combustion mode and lean combustion mode. Rich combustion mode refers to the Engine 210 using a richer combustible mixture during combustion, meaning the air-to-fuel ratio is relatively low. In this mode, fuel atomization is poor, combustion is incomplete, resulting in higher levels of hydrocarbons and carbon monoxide in the exhaust. Lean combustion mode, on the other hand, refers to the Engine 210 using a leaner combustible mixture, meaning the air-to-fuel ratio is relatively high. In this mode, fuel atomization is better, combustion is more complete, and the exhaust contains lower levels of hydrocarbons and carbon monoxide.

[0091] In rich-burn mode, the exhaust gas from engine 210 generates ammonia (NH3) in the three-way catalytic converter 230 and stores it in the passive selective catalytic reduction (SCR) unit. In lean-burn mode, the ammonia stored in the SCR unit reacts chemically with nitrogen oxides (NOx) in the exhaust gas, meaning that NOx is neutralized and consumed in the SCR unit, thereby reducing NOx emissions. Therefore, engine 210 needs to switch between rich-burn and lean-burn modes to maintain the ammonia level in the SCR unit within the target range.

[0092] In some embodiments, refer to Figure 1 and Figure 2 The engine 210 control system 100 includes: an exhaust gas sensor and a controller 110.

[0093] The exhaust gas sensor is configured to detect gas information in the vehicle's exhaust gas line 220; the controller 110 is configured to control the vehicle's engine 210 to switch between rich combustion mode and lean combustion mode based on the gas information detected by the exhaust gas sensor.

[0094] Specifically, the SCR device 240 of this application is a passive selective catalytic reduction (PSCR).

[0095] It is understood that the exhaust gas sensor detects the gas information in the vehicle's exhaust gas pipeline 220, and the controller 110 indirectly obtains the current ammonia storage status in the SCR device 240 based on the gas information detected by the exhaust gas sensor. In this way, the controller controls the vehicle's engine 210 to switch between rich combustion mode and lean combustion mode, so that the amount of ammonia stored in the SCR device 240 is kept within the target storage range.

[0096] The above technical solution provides a more effective switching control method by detecting gas information other than that of the SCR device 240 in the vehicle's exhaust pipe 220, thereby balancing the duration of the rich combustion mode and the lean combustion mode.

[0097] In some embodiments, the controller 110 of this application may be a vehicle controller 110 or a stand-alone controller 110.

[0098] In some embodiments, the exhaust gas sensor is configured to detect gas information other than that of the SCR device.

[0099] It is understood that the exhaust gas sensor detects gas information on the intake side and / or exhaust side of the SCR device 240. More specifically, the SCR device 240 of this application is a passive selective catalytic reduction (PSCR).

[0100] In some embodiments, the gas information includes: concentration information.

[0101] It is understandable that this concentration information can be a precise concentration value or the presence or absence of a certain gaseous component. For example, a nitrogen-oxygen sensor can measure the concentration of nitrogen oxide gas and also detect the presence or absence of ammonia.

[0102] By using this approach, the composition or concentration of the gas discharged from the SCR device 240 or the composition or concentration of the gas entering the SCR device 240 can be obtained through the detection of concentration information, thereby indirectly obtaining the ammonia storage status in the SCR device 240.

[0103] In some embodiments, the controller 110 is configured to control the timing of the engine 210 switching to rich combustion mode and / or lean combustion mode based on the change of the concentration information over time.

[0104] It is understood that the timing of the engine 210 switching to rich combustion mode and / or lean combustion mode can be a preset time ratio based on the change of detected concentration information over time. In this case, the operating time of the two modes can be fixed; or the timing of switching between rich combustion mode and / or lean combustion mode can be dynamically controlled based on real-time concentration information. This application does not limit this, and the choice can be made according to the actual design requirements of the vehicle.

[0105] In some embodiments, the controller 110 is configured to obtain the calibration ammonia storage capacity parameters and calibration reaction parameters of the SCR device 240 based on the changes in the concentration information; and the controller 110 is configured to control the timing of the engine 210 switching to rich combustion mode and / or lean combustion mode based on the calibration ammonia storage capacity parameters and calibration reaction parameters.

[0106] It is understood that the calibration ammonia storage capacity parameter can be the saturated ammonia storage capacity of the SCR device 240. When the ammonia storage capacity in the SCR device 240 reaches the saturated ammonia storage capacity, further storage will result in ammonia overflow. Generally, since the ammonia storage capacity of the SCR device 240 is directly proportional to time, that is, the ammonia storage capacity is the product of the enrichment time and the ammonia storage coefficient (an attribute of the SCR device 240, which can be calibrated); therefore, in a specific embodiment of this application, the calibration ammonia storage capacity parameter can also be expressed by the saturated enrichment time in the enrichment mode.

[0107] The calibration reaction parameter can be the ammonia-to-nitrogen ratio of the chemical reaction in the SCR device 240, which represents the catalytic consumption capacity of the SCR device 240 for nitrogen oxides in the gas entering the SCR device 240. In a specific embodiment of this application, the calibration reaction parameter can also be expressed as the time ratio of rich combustion time to lean combustion time.

[0108] In a specific embodiment of this application, the engine 210 is switched between rich combustion mode and lean combustion mode by selecting a first target rich combustion time and a first target lean combustion time based on calibration ammonia storage capacity parameters and calibration reaction parameters. Specifically, during the first target rich combustion time, the ammonia stored in the SCR device 240 is less than the saturated ammonia storage capacity, and the time ratio of the first target rich combustion time to the first target lean combustion time is determined according to the calibration reaction parameters.

[0109] An optimal ammonia storage capacity can be defined for the SCR device 240, ensuring that ammonia does not overflow while maintaining a longer lean-burn time. The ratio of this optimal ammonia storage capacity to the saturated ammonia storage capacity is fixed. Even as the SCR device 240 ages and its saturated ammonia storage capacity decreases, the optimal ammonia storage capacity can still be calculated because the ratio is known. Based on this optimal ammonia storage capacity setting, during the switching process between the first target rich-burn time and the first target lean-burn time, the actual ammonia storage capacity in the SCR device 240 is kept within the target storage range. The target storage range is smaller than the calibrated ammonia storage capacity parameter; it can be a range near the optimal ammonia storage capacity to achieve good tail gas treatment, or it can be any range greater than 0 and less than the calibrated ammonia storage capacity parameter.

[0110] In some embodiments, refer to Figure 1 and Figure 2 The exhaust gas sensor includes a rear-mounted nitrogen oxide sensor 120.

[0111] A post-nitrogen oxygen sensor 120 is disposed on the outlet side of the SCR device 240 to detect the gas information of nitrogen oxides leaving the SCR device 240; wherein, the controller 110 is configured to obtain the calibration ammonia storage capacity parameter and the calibration reaction parameter based on the gas information detected by the post-nitrogen oxygen sensor 120.

[0112] It should be noted that the post-NOx sensor 120 is used to detect the NOx concentration on the outlet side of the SCR device 240, and can also detect the presence or absence of ammonia, thereby determining whether the SCR device 240 has reached its saturated ammonia storage capacity.

[0113] In a specific embodiment of this application, the ammonia storage capacity parameters are calibrated using the following steps:

[0114] 1) First, control the engine 210 to be in lean-burn mode until the rear nitrogen oxygen sensor 120 detects that the NOx concentration exceeds 20ppm, and deplete the ammonia stored in the SCR device 240.

[0115] 2) Then switch engine 210 to rich combustion mode until the rear nitrogen oxygen sensor 120 detects ammonia, indicating that the SCR device 240 has reached the maximum ammonia storage capacity (i.e., saturated ammonia storage capacity). Record the rich combustion time; this rich combustion time corresponds to the calibrated ammonia storage capacity parameter.

[0116] 3) Switch engine 210 to lean-burn mode until the rear nitrogen oxygen sensor 120 detects that the NOx concentration exceeds 20ppm. Record the lean-burn time at this time. The calibration reaction parameters can be obtained based on the ratio of the lean-burn time to the rich-burn time in step 2).

[0117] The above calibration operations can be performed when the SCR equipment 240 leaves the factory, or periodically (e.g., during vehicle maintenance), or at any time when the rear nitrogen oxide sensor 120 detects an abnormal NOx concentration.

[0118] It should be noted that after the lean combustion mode in step 3), ammonia pre-storage is required to ensure that the SCR device 240 has a suitable amount of ammonia before switching to the rich combustion mode and lean combustion mode.

[0119] In some embodiments, the controller 110 is configured to obtain the real-time ammonia storage capacity parameter of the SCR device 240 based on the change in the concentration information; and the controller 110 is configured to control the timing of the engine 210 switching to rich combustion mode and / or lean combustion mode based on the real-time ammonia storage capacity parameter.

[0120] It is understandable that the real-time ammonia storage capacity parameter can be either the real-time ammonia storage amount of the SCR unit 240 or the ammonia consumption. The real-time ammonia storage capacity parameter can also be expressed using the rich combustion time and lean combustion time; based on these times, the real-time ammonia storage amount or ammonia consumption can be indirectly obtained.

[0121] By adopting this approach, the switching of the engine 210 is controlled by real-time ammonia storage capacity parameters, enabling the SCR device 240 to better adapt to the real-time operating conditions of the exhaust gas treatment system 200, thereby achieving better exhaust gas treatment results.

[0122] In some embodiments, the controller 110 is configured to control the timing of the engine 210 switching to rich combustion mode based on the gas information detected by the rear nitrogen-oxygen sensor 120.

[0123] In this embodiment, the post-NOx sensor 120 is used to detect the NOx concentration on the outlet side of the SCR device 240. For example, when it is detected that the current engine 210 is in lean-burn mode and the post-NOx sensor 120 detects that the NOx concentration exceeds 20 ppm, the controller 110 sends a command to the engine 210 to switch to rich-burn mode.

[0124] By adopting this approach, the NOx concentration feedback from the outlet side of the SCR device 240 is used to control the engine 210 to switch to rich combustion mode, thereby achieving better exhaust gas treatment results.

[0125] In some embodiments, the controller 110 is configured to obtain the calibration ammonia storage capacity parameter of the SCR device 240 based on the gas information detected by the post-nitrogen oxygen sensor 120; and the controller 110 is configured to control the time point at which the engine 210 switches to the lean-burn mode based on the calibration ammonia storage capacity parameter.

[0126] It is understandable that the calibration ammonia storage capacity parameter here can also be the saturated ammonia storage capacity.

[0127] Using this approach, the engine 210 can switch between rich and lean combustion modes simply by obtaining the calibrated ammonia storage capacity parameters and combining them with the detection results of the rear-mounted nitrogen-oxygen sensor 120.

[0128] In a specific embodiment of this application, the engine 210 is switched to lean-burn mode based on the calibrated ammonia storage capacity parameter to select a second target rich combustion time. Specifically, during the second target rich combustion time, the ammonia stored in the SCR device 240 is less than the saturated ammonia storage capacity, or it can be understood as the second target rich combustion time being less than the saturated rich combustion time. The switching from lean-burn mode to rich combustion mode is achieved based on the detection results of the rear-mounted nitrogen-oxygen sensor 120.

[0129] In some embodiments, the engine 210 control system 100 includes a plurality of exhaust gas sensors to detect, respectively, the exhaust gas information entering the SCR device 240 or the exhaust gas information leaving the SCR device 240. This approach allows for more comprehensive gas information, thereby achieving more precise control.

[0130] In some embodiments, refer to Figure 3 and Figure 4 The exhaust gas sensor includes an ammonia sensor 140.

[0131] An ammonia sensor 140 is installed on the intake side of the SCR device 240 to detect the gas information of ammonia entering the SCR device 240; wherein, the controller 110 is configured to control the timing of the engine 210 switching to lean-burn mode based on the gas information detected by the ammonia sensor 140.

[0132] By adopting this scheme, the amount of ammonia entering the SCR device 240 can be obtained through the detection results of the ammonia sensor 140, thereby obtaining the change in the ammonia storage of the SCR device 240, and thus controlling the timing of the engine 210 switching to lean-burn mode, so that the ammonia storage of the SCR device 240 is kept within a suitable range.

[0133] It should be noted that the amount of ammonia entering the SCR equipment 240 is related to factors such as ammonia concentration and combustion time, as well as temperature and flow rate. In actual operation, it is necessary to correct errors through periodic calibration.

[0134] In some embodiments, refer to Figure 3 and Figure 4 The exhaust gas sensor includes a front-mounted nitrogen oxide sensor 130.

[0135] A front-mounted nitrogen oxide sensor 130 is installed on the intake side of the SCR device 240 to detect the gas information of nitrogen oxides entering the SCR device 240; wherein, the controller 110 is configured to control the timing of the engine 210 switching to rich combustion mode according to the gas information detected by the front-mounted nitrogen oxide sensor 130.

[0136] By adopting this scheme, the amount of NOx entering the SCR device 240 can be obtained through the detection results of the pre-mounted nitrogen-oxygen sensor 130, thereby obtaining the consumption of ammonia in the SCR device 240. This allows control over the timing of the engine 210 switching to rich combustion mode, ensuring that the ammonia storage in the SCR device 240 remains within a suitable range.

[0137] In some embodiments, refer to Figure 3 and Figure 4An ammonia sensor 140 and a pre-NOx sensor 130 are simultaneously installed on the inlet side of the SCR device 240, and a post-NOx sensor 120 is installed on the outlet side of the SCR device 240. The ammonia sensor 140 is used to detect the gas information of ammonia entering the SCR device 240; the pre-NOx sensor 130 is used to detect the gas information of nitrogen oxides entering the SCR device 240; and the post-NOx sensor 120 is used to detect the gas information of nitrogen oxides leaving the SCR device 240.

[0138] The controller 110 is configured to obtain the calibration ammonia storage capacity parameters and calibration reaction parameters of the SCR device 240 based on the gas information detected by the rear nitrogen-oxygen sensor 120; and the controller 110 is configured to control the timing of the engine 210 switching to rich combustion mode and / or lean combustion mode based on the calibration reaction parameters, calibration ammonia storage capacity parameters, and gas information detected by the ammonia sensor 140 and the front nitrogen-oxygen sensor 130.

[0139] It is understood that the calibration reaction parameters and ammonia storage capacity parameters can be calibrated using the above calibration steps; it should be noted that in this embodiment, the real-time ammonia storage capacity of the SCR device 240 can be directly obtained through the combination of multiple sensors.

[0140] In a specific embodiment of this application, a third target rich combustion time is selected based on the calibrated ammonia storage capacity parameters to control the engine 210 to switch to lean combustion mode. The ammonia storage amount is calculated by the ammonia sensor 140, and the amount of NOx entering the SCR device 240 is calculated by the pre-NOx sensor 130. Based on the obtained calibrated reaction parameters, the ammonia consumed by the current NOx is calculated in real time. When the remaining ammonia in the SCR device 240 is about to reach 0, the lean combustion mode is switched off.

[0141] According to a second aspect of this application, an engine control method is provided for controlling a vehicle's engine to switch between rich combustion mode and lean combustion mode; see reference Figure 5 The engine control method includes the following main steps:

[0142] S100: Controls the vehicle's engine to switch to rich combustion mode or lean combustion mode based on the gas information in the vehicle's exhaust pipe.

[0143] The above technical solution provides a more effective switching control method by detecting gas information in the vehicle's exhaust pipe, thereby balancing the duration of rich combustion mode and lean combustion mode.

[0144] In some embodiments, the gas information is gas information other than that of the SCR device 240.

[0145] Specifically, the gas information refers to the gas information on the inlet side and / or outlet side of the SCR device 240.

[0146] In some embodiments, the gas information includes: concentration information.

[0147] It is understandable that this concentration information can be a precise concentration value or the presence or absence of a certain gaseous component.

[0148] By using this approach, the composition or concentration of the gas discharged from the SCR device 240 or the composition or concentration of the gas entering the SCR device 240 can be obtained through the detection of concentration information, thereby indirectly obtaining the ammonia storage status in the SCR device 240.

[0149] In some embodiments, step S100 includes the following specific steps:

[0150] Step S100a: Determine the time point when the engine switches to rich combustion mode and / or lean combustion mode based on the change of the concentration information over time.

[0151] It is understood that the timing of the engine switching to rich combustion mode and / or lean combustion mode can be a preset time ratio based on the change of detected concentration information over time. In this case, the operating time of the two modes can be fixed; or the timing of switching between rich combustion mode and / or lean combustion mode can be dynamically controlled based on real-time concentration information. This application does not limit this, and the choice can be made according to the actual design requirements of the vehicle.

[0152] In some embodiments, refer to Figure 6 Step S100a includes the following specific steps:

[0153] S210: Obtain the calibration ammonia storage capacity parameters and calibration reaction parameters of the SCR device based on the changes in the concentration information;

[0154] S220: Determine the time point for the engine to switch to rich combustion mode or lean combustion mode based on the calibration ammonia storage capacity parameters and calibration reaction parameters.

[0155] It is understandable that the parameter for calibrating ammonia storage capacity can be the saturated ammonia storage capacity of the SCR device. When the ammonia storage capacity in the SCR device reaches the saturated ammonia storage capacity, further storage will cause ammonia to overflow. Generally speaking, since the ammonia storage capacity of the SCR device is proportional to time, that is, the ammonia storage capacity is the product of the enriched combustion time and the ammonia storage coefficient (an attribute of the SCR device, which can be calibrated), the saturated ammonia storage capacity can also be expressed by the saturated enriched combustion time in the enriched combustion mode.

[0156] The calibration reaction parameter can be the ammonia-to-nitrogen ratio of the chemical reaction in the SCR device, which represents the SCR device's ability to catalytically consume nitrogen oxides in the gas entering the SCR device.

[0157] In some embodiments, refer to Figure 7 Step S100a includes the following specific steps:

[0158] S310: Obtain the real-time ammonia storage capacity parameters of the SCR device based on the changes in the concentration information;

[0159] S320: Determine the time point for the engine to switch to the rich combustion mode or the lean combustion mode based on the real-time ammonia storage capacity parameters.

[0160] It is understandable that the real-time ammonia storage capacity parameter can be either the real-time ammonia storage capacity of the SCR device or the ammonia consumption.

[0161] By adopting this approach, the switching of the engine is controlled through real-time ammonia storage capacity parameters, enabling the SCR equipment to better adapt to the real-time operating conditions of the exhaust gas treatment system, thereby achieving better exhaust gas treatment results.

[0162] In some embodiments, refer to Figure 8 Step S100a includes the following specific steps:

[0163] S410: When the concentration of nitrogen oxides leaving the SCR device reaches a preset nitrogen oxide concentration threshold, control the vehicle's engine to switch to rich combustion mode.

[0164] For example, when the rear-mounted nitrogen oxide sensor detects that the NOx concentration exceeds 20 ppm, the controller sends a command to the engine to switch to rich combustion mode.

[0165] By adopting this approach, the engine is switched to a rich combustion mode through feedback control of nitrogen oxide concentration away from the SCR device, thereby achieving better exhaust gas treatment results.

[0166] In some embodiments, refer to Figure 9 Step S100a includes the following specific steps:

[0167] S421: Obtain the calibration ammonia storage capacity parameters of the SCR device based on the gas information of nitrogen oxides leaving the SCR device;

[0168] S422: Determine the time point for the engine to switch to the lean-burn mode based on the calibrated ammonia storage capacity parameters.

[0169] Using this approach, the engine can switch between rich and lean combustion modes simply by obtaining the calibrated ammonia storage capacity parameters and combining them with the detection results from the rear-mounted nitrogen-oxygen sensor.

[0170] In some embodiments, the gas information includes gas information of the exhaust gas entering the SCR device and / or gas information of the exhaust gas leaving the SCR device.

[0171] In some embodiments, step S100a includes the following specific steps:

[0172] The timing of the engine switching to lean-burn mode is determined based on the concentration information of ammonia entering the SCR device.

[0173] The timing of the engine switching to rich combustion mode is determined based on the concentration information of nitrogen oxides entering the SCR device.

[0174] By adopting this scheme, the amount of ammonia entering the SCR device can be obtained by measuring the concentration of ammonia gas entering the SCR device, thereby obtaining the change in the ammonia storage capacity of the SCR device. This allows control over the timing of the engine switching to lean-burn mode, ensuring that the ammonia storage capacity of the SCR device remains within a suitable range.

[0175] By analyzing the concentration of nitrogen oxides entering the SCR device, the amount of NOx entering the SCR device can be obtained, thereby determining the ammonia consumption in the SCR device. This information can then be used to control the timing of the engine switching to rich combustion mode, ensuring that the ammonia storage in the SCR device remains within a suitable range.

[0176] In some embodiments, refer to Figure 10 Step S100a includes the following specific steps:

[0177] S510: Obtain the calibration ammonia storage capacity parameters and calibration reaction parameters of the SCR device based on the concentration information of nitrogen oxides leaving the SCR device;

[0178] S510: Determine the time point for the engine to switch to rich combustion mode or lean combustion mode based on the calibration reaction parameters, calibration ammonia storage capacity parameters, and the concentration information of ammonia and nitrogen oxides entering the SCR device.

[0179] It is understood that the calibration reaction parameters and ammonia storage capacity parameters can be calibrated using the above calibration steps; it should be noted that in this embodiment, the real-time ammonia storage capacity of the SCR device can be directly obtained through the combination of multiple sensors.

[0180] Referring to the aforementioned engine control system and engine control method, as a specific application of this application, the following details three control strategies based on the aforementioned engine control system and engine control method.

[0181] Fixed-time switching strategy

[0182] This method controls the rich-lean transition by fixing the rich-burn time and the lean-burn time. Under the premise of meeting emission standards, the longer the lean-burn duration, the better. The switching time needs to be calibrated.

[0183] The enrichment time needs to be calibrated according to different PSCRs to obtain the PSCR's ammonia storage capacity (saturated ammonia storage / breakdown ammonia storage) and catalytic ability (reaction ratio). Generally speaking, the enrichment time is limited by the PSCR's ammonia storage capacity. It is necessary to store as much ammonia as possible, but without overflowing. If too much ammonia is stored, it will also lead to a sudden increase in NOx emissions during the transition to lean combustion.

[0184] The calibration steps are as follows:

[0185] 1) First, control the engine 210 to be in lean-burn mode until the rear nitrogen oxygen sensor 120 detects that the NOx concentration exceeds 20ppm, and deplete the ammonia stored in the PSCR.

[0186] 2) Then switch engine 210 to rich combustion mode until the rear nitrogen oxygen sensor 120 detects ammonia, indicating that the PSCR has reached the maximum ammonia storage capacity (i.e., saturated ammonia storage capacity). Record the rich combustion time; this rich combustion time corresponds to the saturated ammonia storage capacity.

[0187] 3) Switch engine 210 to lean-burn mode until the rear nitrogen oxygen sensor 120 detects that the NOx concentration exceeds 20ppm. Record the lean-burn time at this time. Based on the ratio of the lean-burn time to the rich-burn time in step 2), the reaction ratio of ammonia and NOx in PSCR can be obtained.

[0188] By using the enriched combustion time corresponding to the saturated ammonia storage in the above calibration steps, the optimal enriched combustion time corresponding to the optimal ammonia storage in the PSCR can be calculated based on the PSCR properties, and the optimal lean combustion time can be obtained according to the reaction ratio.

[0189] In this strategy, the actual rich combustion time and lean combustion time during the switching process are designed to allow the actual ammonia storage capacity of the PSCR to fluctuate around the optimal ammonia storage capacity.

[0190] It should be noted that after sufficient lean combustion, that is, after performing the above calibration steps, ammonia pre-storage is required to ensure that the PSCR is in optimal condition before the formal rich-lean switch is performed.

[0191] The above calibration process can be performed when the PSCR leaves the factory. However, since the PSCR's ammonia storage capacity and catalytic activity decrease over time, continuous calibration is necessary. Calibration can be completed during maintenance and takes approximately ten minutes. Of course, if abnormal NOx concentrations are detected in the exhaust, calibration can be performed at any time.

[0192] Nitrogen oxygen feedback control strategy

[0193] This strategy stores ammonia during a fixed rich combustion period. After the rich combustion ends, it switches to lean combustion. The lean combustion period is controlled by feedback from the rear-mounted nitrogen-oxygen sensor 120. When the engine is detected to be in lean combustion mode and the rear-mounted nitrogen-oxygen sensor 120 detects that the NOx concentration exceeds 20ppm, the controller sends a command to the engine to switch to rich combustion mode.

[0194] In this strategy, the NOx concentration is detected by a post-NOx sensor 120. The ammonia storage capacity of the PCSR is almost exhausted at the end of each lean-burn mode, so there is no need to meet the requirement of fluctuations near the optimal ammonia storage capacity; that is, the rich-burn time does not need to exceed the saturation rich-burn time. The calibration method for the saturation rich-burn time can refer to the fixed-time switching strategy.

[0195] Ammonia storage feedback control strategy

[0196] The amount of ammonia stored is calculated by an ammonia sensor, thereby finding a suitable rich combustion time. The rich combustion time is less than the saturated rich combustion time. The calibration method for the saturated rich combustion time can refer to the fixed time switching strategy.

[0197] After the enriched combustion mode ends, the system switches to lean combustion mode. The lean combustion time is determined by the pre-mounted nitrogen and oxygen sensor. The amount of NH3 consumed by NOx can be calculated in real time based on the reaction ratio of ammonia and NOx in the PSCR. The lean combustion mode ends when the remaining amount of NH3 in the PSCR is about to reach zero (e.g., when the remaining amount is 30%). The reaction ratio of ammonia and NOx in the PSCR can be determined using a fixed-time switching strategy.

[0198] According to a third aspect of this application, a non-transitory computer-readable storage medium is provided, on which a computer program is stored, which, when executed by a processor, implements the engine control method as described above.

[0199] According to a fourth aspect of this application, a computer program product is also provided, comprising a computer program that, when executed by a processor, implements the engine control method as described above.

[0200] According to a fifth aspect of this application, an electronic device is also provided, the electronic device comprising: a memory and a processor.

[0201] The memory stores a computer program; the processor executes the computer program in the memory to implement the engine control method described above.

[0202] Please see Figure 11The electronic device 800 may include a processing unit 801 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in read-only memory (ROM) 802 or a program loaded from storage device 808 into random access memory (RAM) 803. The random access memory (RAM) 803 also stores various programs and data required for the operation of the electronic device 800. The processing unit 801, ROM 802, and RAM 803 are interconnected via a bus 804. An input / output (I / O) interface 805 is also connected to the bus 804.

[0203] Typically, the following devices can be connected to I / O interface 805: input devices 806 including, for example, touchscreens, touchpads, keyboards, mice, cameras, microphones, accelerometers, gyroscopes, etc.; output devices 807 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; storage devices 808 including, for example, magnetic tapes, hard disks, etc.; and communication devices 809. Communication device 809 allows electronic device 800 to communicate wirelessly or wiredly with other devices to exchange data. Although... Figure 11 An electronic device 800 with various devices is shown; however, it should be understood that it is not required to implement or possess all of the devices shown. More or fewer devices may be implemented or possessed alternatively. Figure 11 Each box shown can represent a device or multiple devices as needed.

[0204] In particular, according to some embodiments of this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, some embodiments of this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device 809, or installed from a storage device 808, or installed from a ROM 802. When the computer program is executed by the processing device 801, it performs the functions defined in the methods of some embodiments of this application.

[0205] It should be noted that the computer-readable medium in some embodiments of this application may be a computer-readable signal medium or a computer-readable storage medium, or any combination thereof. The computer-readable storage medium may be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof, and this application does not specifically limit its use. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disc read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0206] In some embodiments of this application, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in connection with an instruction execution system, apparatus, or device. In some embodiments of this application, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to: wires, optical fibers, RF (radio frequency), etc., or any suitable combination thereof.

[0207] In some implementations, clients and servers can communicate using any currently known or future-developed network protocol, such as Hypertext Transfer Protocol (HTTP), and can interconnect with digital data communication (e.g., communication networks) of any form or medium. Examples of communication networks include Local Area Networks (LANs), Wide Area Networks (WANs), the Internet (e.g., the Internet), and Advanced Developers Hands-On Conference (ADHO) networks, as well as any currently known or future-developed networks.

[0208] The aforementioned computer-readable medium may be included in the aforementioned electronic device, or it may exist independently without being assembled into the electronic device. The aforementioned computer-readable medium carries one or more programs that, when executed by the electronic device, cause the electronic device to: control the vehicle's engine to switch to rich combustion mode or lean combustion mode based on gas information in the vehicle's exhaust pipe.

[0209] Computer program code for performing operations of some embodiments of this application can be written in one or more programming languages ​​or a combination thereof. These programming languages ​​include object-oriented programming languages ​​such as Java, Smalltalk, and C++, as well as conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network (including a local area network (LAN) or a wide area network (WAN)), or it can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0210] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function.

[0211] It should also be noted that in some alternative implementations, the functions marked in the box may occur in a different order than those marked in the attached figures.

[0212] For example, two consecutively represented blocks can actually be executed in substantially parallel order, and sometimes they can be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, as well as combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified functions or operations, or using a combination of dedicated hardware and computer instructions.

[0213] The units described in some embodiments of this application can be implemented in software or in hardware. The described units can also be located in a processor.

[0214] The functions described above in this document can be performed, at least in part, by one or more hardware logic components. For example, exemplary types of hardware logic components that can be used, without limitation, include: Field Programmable Gate Array (FPGA), Application Specific Integrated Circuit (ASIC), Application Specific Standard Parts (ASSP), System on Chips (SOC), Complex Programmable Logic Device (CPLD), and so on.

[0215] According to the sixth aspect of this application, referring to Figure 12 The invention also provides a vehicle 10, comprising: an engine control system 100 as described above, or a computer-readable storage medium as described above, or a computer program product as described above, or an electronic device as described above.

[0216] In a specific embodiment of this application, since the engine torque fluctuates greatly during the switching between rich combustion mode and lean combustion mode, the above control system and control method can only be used when the engine is in the range-extending mode of a range-extended vehicle or a hybrid vehicle.

[0217] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0218] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0219] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0220] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. An engine control system characterized by: include: The exhaust gas sensor is configured to detect gas information in the vehicle's exhaust pipe. The controller is configured to control the vehicle's engine to switch between rich combustion mode and lean combustion mode based on the gas information detected by the exhaust gas sensor.

2. The engine control system of claim 1, wherein: The exhaust gas sensor is configured to detect gas information other than that of the SCR device.

3. The engine control system according to claim 1, characterized in that: wherein The gas information includes: concentration information.

4. The engine control system according to claim 3, characterized in that: wherein The controller is configured to control the timing of the engine switching to rich combustion mode and / or lean combustion mode based on the changes in the concentration information over time.

5. The engine control system according to claim 4, characterized in that: wherein The controller is configured to obtain the calibration ammonia storage capacity parameters and calibration reaction parameters of the SCR device based on the changes in the concentration information; and the controller is configured to control the timing of the engine switching to rich combustion mode and / or lean combustion mode based on the calibration ammonia storage capacity parameters and calibration reaction parameters.

6. The engine control system according to claim 5, characterized in that: wherein The exhaust gas sensor includes: A post-mounted nitrogen and oxygen sensor is used to detect gaseous information of nitrogen and oxygen compounds leaving the SCR device; The controller is configured to obtain the calibration ammonia storage capacity parameters and the calibration reaction parameters based on the gas information detected by the post-nitrogen oxygen sensor.

7. The engine control system according to claim 4, characterized in that: wherein The controller is configured to obtain the real-time ammonia storage capacity parameter of the SCR device based on the change of the concentration information; and the controller is configured to control the time point at which the engine switches to rich combustion mode and / or lean combustion mode based on the real-time ammonia storage capacity parameter.

8. The engine control system according to claim 7, characterized in that: wherein The exhaust gas sensor includes: A post-mounted nitrogen and oxygen sensor is used to detect gaseous information of nitrogen and oxygen compounds leaving the SCR device; The controller is configured to control the timing of the engine switching to rich combustion mode based on the gas information detected by the rear nitrogen-oxygen sensor.

9. The engine control system according to claim 8, characterized in that: wherein, The controller is configured to obtain the calibration ammonia storage capacity parameters of the SCR device based on the gas information detected by the post-nitrogen oxygen sensor. Furthermore, the controller is configured to control the timing of the engine switching to the lean-burn mode based on the calibrated ammonia storage capacity parameters.

10. The engine control system according to claim 7, characterized in that: The engine control system includes multiple exhaust gas sensors to detect the gas information of the exhaust gas entering the SCR device or the gas information of the exhaust gas leaving the SCR device.

11. The engine control system according to claim 10, characterized in that: wherein, The exhaust gas sensor includes: An ammonia sensor is used to detect the gas information of ammonia entering the SCR device; The controller is configured to control the timing of the engine switching to lean-burn mode based on the gas information detected by the ammonia sensor.

12. The engine control system according to claim 10, characterized in that: wherein, The exhaust gas sensor includes: A pre-mounted nitrogen and oxygen sensor is used to detect the gaseous information of nitrogen and oxygen compounds entering the SCR device; The controller is configured to control the timing of the engine switching to rich combustion mode based on the gas information detected by the front nitrogen-oxygen sensor.

13. The engine control system of claim 10, Its features are: The exhaust gas sensor further includes: An ammonia sensor is used to detect the gas information of ammonia entering the SCR device; A pre-mounted nitrogen and oxygen sensor is used to detect the gaseous information of nitrogen and oxygen compounds entering the SCR device; A post-mounted nitrogen and oxygen sensor is used to detect gaseous information of nitrogen and oxygen compounds leaving the SCR device; The controller is configured to obtain the calibration ammonia storage capacity parameters and calibration reaction parameters of the SCR device based on the gas information detected by the post-nitrogen oxygen sensor. Furthermore, the controller is configured to control the timing of the engine switching to rich combustion mode and / or lean combustion mode based on the calibration reaction parameters, calibration ammonia storage capacity parameters, and gas information detected by the ammonia sensor and the pre-nitrogen oxygen sensor.

14. An engine control method characterized by: include: The system controls the vehicle's engine to switch between rich and lean combustion modes based on the gas information in the vehicle's exhaust pipe.

15. The engine control method according to claim 14, characterized in that: wherein The gas information refers to gas information other than that from the SCR device.

16. The engine control method according to claim 15, characterized in that: wherein The gas information includes: concentration information.

17. The engine control method according to claim 16, characterized in that: wherein The method of controlling the vehicle's engine to switch to rich or lean combustion mode based on gas information in the vehicle's exhaust pipe includes: The timing of the engine switching to rich combustion mode and / or lean combustion mode is determined based on the change of the concentration information over time.

18. The engine control method of claim 17, Its features are: The step of determining the time point for the engine to switch to rich combustion mode and / or lean combustion mode based on the change of the concentration information over time includes: Based on the changes in the concentration information, the calibration ammonia storage capacity parameters and calibration reaction parameters of the SCR equipment are obtained; The timing for switching the engine to rich combustion mode or lean combustion mode is determined based on the calibration ammonia storage capacity parameters and calibration reaction parameters.

19. The engine control method of claim 17, Its features are: The step of determining the time point for the engine to switch to rich combustion mode and / or lean combustion mode based on the change of the concentration information over time includes: The real-time ammonia storage capacity parameters of the SCR device are obtained based on the changes in the concentration information. The timing for switching the engine to the rich combustion mode or the lean combustion mode is determined based on the real-time ammonia storage capacity parameters.

20. The engine control method according to claim 17, characterized in that: The step of determining the time point for the engine to switch to rich combustion mode and / or lean combustion mode based on the change of the concentration information over time includes: When the concentration of nitrogen oxides leaving the SCR device reaches a preset nitrogen oxide concentration threshold, the vehicle's engine is controlled to switch to rich combustion mode.

21. The engine control method according to claim 20, characterized in that: The step of determining the time point for the engine to switch to rich combustion mode and / or lean combustion mode based on the change of the concentration information over time includes: The calibration ammonia storage capacity parameters of the SCR device are obtained based on the gas information of nitrogen oxides leaving the SCR device; The timing of switching the engine to the lean-burn mode is determined based on the calibrated ammonia storage capacity parameters.

22. The engine control method according to claim 19, characterized in that: wherein The gas information includes gas information of the exhaust gas entering the SCR device and / or gas information of the exhaust gas leaving the SCR device.

23. The engine control method according to claim 22, characterized in that: The step of determining the time point for the engine to switch to rich combustion mode and / or lean combustion mode based on the change of the concentration information over time includes: The timing of the engine switching to lean-burn mode is determined based on the ammonia concentration information entering the SCR device; and / or The timing of the engine switching to rich combustion mode is determined based on the concentration information of nitrogen oxides entering the SCR device.

24. The engine control method according to claim 22, characterized in that: The step of determining the time point for the engine to switch to rich combustion mode and / or lean combustion mode based on the change of the concentration information over time includes: The calibration ammonia storage capacity parameters and calibration reaction parameters of the SCR device are obtained based on the concentration information of nitrogen oxides leaving the SCR device. The timing for the engine to switch to rich combustion mode or lean combustion mode is determined based on the calibration reaction parameters, calibration ammonia storage capacity parameters, and the concentration information of ammonia and nitrogen oxides entering the SCR device.

25. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the processor, it implements the engine control method as described in any one of claims 14 to 24.

26. A computer program product comprising a computer program, characterized in that: When the computer program is executed by the processor, it implements the engine control method as described in any one of claims 14 to 24.

27. An electronic device, characterized in that: The electronic device includes: A memory that stores computer programs; A processor for executing the computer program in the memory to implement the engine control method as described in any one of claims 14 to 24.

28. A vehicle characterized by include: An engine control system as claimed in any one of claims 1 to 13, or a computer-readable storage medium as claimed in claim 25, or a computer program product as claimed in claim 26, or an electronic device as claimed in claim 27.

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