Engine exhaust temperature control method and device, electronic equipment and storage medium

Abstract

The application relates to an engine exhaust temperature control method and device, electronic equipment, a storage medium and a computer program product. The method comprises the following steps: determining a real-time catalytic reduction efficiency; determining an exhaust temperature management level of an engine based on the real-time catalytic reduction efficiency; the exhaust temperature management level is used for representing an adjustment degree of adjusting a post-processing temperature of the engine; determining an exhaust temperature mode matched with the exhaust temperature management level according to the exhaust temperature management level, and performing engine exhaust temperature processing based on the exhaust temperature mode to adjust the post-processing temperature of the engine. The method can improve the engine exhaust temperature control efficiency.

Description

Technical Field

[0001] This application relates to the field of automotive technology, and in particular to an engine exhaust temperature control method, device, electronic device, storage medium, and computer program product. Background Technology

[0002] With the development of automotive technology, the most effective methods for removing nitrogen oxides and particulate matter on the market are SCR (Selective Catalytic Reduction) and DPF (Dedicated Particulate Filter). The reaction efficiency of passive regeneration of SCR and DPF is affected by the aftertreatment temperature. A reasonable aftertreatment temperature helps SCR and DPF remove nitrogen oxides and particulate matter.

[0003] In traditional technology, when adjusting the aftertreatment temperature of an engine, the exhaust temperature management function is usually activated when the SCR temperature is below the threshold. This temperature-based exhaust temperature management method is inefficient. Summary of the Invention

[0004] Therefore, it is necessary to provide an engine exhaust temperature control method, device, electronic device, computer-readable storage medium, and computer program product that can improve the efficiency of engine exhaust temperature control in response to the above-mentioned technical problems.

[0005] In a first aspect, this application provides an engine exhaust temperature control method. The method includes:

[0006] Determine the real-time catalytic reduction efficiency;

[0007] Based on the real-time catalytic reduction efficiency, the exhaust temperature management level of the engine is determined; the exhaust temperature management level is used to characterize the degree of adjustment of the engine's aftertreatment temperature.

[0008] Based on the exhaust temperature management level, a temperature exhaust method matching the exhaust temperature management level is determined, and engine exhaust temperature treatment is performed based on the exhaust temperature method to adjust the engine's after-treatment temperature.

[0009] In one embodiment, determining the engine exhaust temperature management level based on the catalytic reduction efficiency includes:

[0010] Determine the catalytic reduction efficiency range to which the catalytic reduction efficiency belongs;

[0011] Based on the catalytic reduction efficiency range, the exhaust temperature management level of the engine is determined.

[0012] In one embodiment, the catalytic reduction efficiency range is divided into multiple ranges arranged from high to low according to the numerical range of the theoretical catalytic reduction efficiency. Each range corresponds to a temperature management level, and the temperature adjustment degree of the temperature management level of each range increases sequentially.

[0013] In one embodiment, the exhaust temperature management level is divided into a first exhaust temperature management level, a second exhaust temperature management level, a third exhaust temperature management level, a fourth exhaust temperature management level, a fifth exhaust temperature management level, a sixth exhaust temperature management level, and a seventh exhaust temperature management level;

[0014] The first exhaust temperature management level includes a combined exhaust temperature method that adjusts the intake throttle valve, the exhaust temperature management valve, and the fuel injector; the second exhaust temperature management level includes a combined exhaust temperature method that adjusts the exhaust temperature management valve and the fuel injector; the third exhaust temperature management level includes a combined exhaust temperature method that adjusts the intake throttle valve and the fuel injector; the fourth exhaust temperature management level includes a combined exhaust temperature method that adjusts the intake throttle valve and the exhaust temperature management valve; the fifth exhaust temperature management level includes a single exhaust temperature method that adjusts the fuel injector; the sixth exhaust temperature management level includes a single exhaust temperature method that adjusts the exhaust temperature management valve; and the seventh exhaust temperature management level includes a single exhaust temperature method that adjusts the intake throttle valve. The temperature adjustment capability of the fuel injector is greater than that of the exhaust temperature management valve, and the temperature adjustment capability of the exhaust temperature management valve is greater than that of the intake throttle valve.

[0015] In one embodiment, the engine exhaust temperature treatment based on the exhaust temperature method to regulate the engine aftertreatment temperature includes:

[0016] If the exhaust temperature method is a combination of adjusting the intake throttle valve, the exhaust temperature management valve, and the fuel injector, then the intake throttle valve opening is reduced, the exhaust temperature management valve opening is reduced, and the fuel injection quantity near and after the fuel injector is increased to adjust the engine's aftertreatment temperature.

[0017] If the exhaust temperature method is a combination of adjusting the exhaust temperature management valve and the injector, then the opening of the exhaust temperature management valve is reduced and the injection quantity of the injector near and after injection is increased to adjust the engine's aftertreatment temperature.

[0018] If the exhaust temperature method is a combination of adjusting the intake throttle valve and the fuel injector, then the intake throttle valve opening is reduced and the fuel injection quantity near and after the fuel injector is increased to adjust the engine's aftertreatment temperature.

[0019] If the exhaust temperature method is a combination of adjusting the intake throttle valve and the exhaust temperature management valve, then reduce the opening of the intake throttle valve and the opening of the exhaust temperature management valve to adjust the engine's aftertreatment temperature.

[0020] If the exhaust temperature method includes adjusting the single exhaust temperature of the injector, then the amount of fuel injected near the injector is increased to adjust the engine's aftertreatment temperature.

[0021] If the exhaust temperature method is a single exhaust temperature method that includes adjusting the exhaust temperature management valve, then reduce the opening of the exhaust temperature management valve to adjust the engine's aftertreatment temperature.

[0022] If the exhaust temperature method is a single exhaust temperature method that includes adjusting the intake throttle valve, then the intake throttle valve opening is reduced to adjust the engine's aftertreatment temperature.

[0023] In one embodiment, determining the real-time catalytic reduction efficiency includes:

[0024] The nitrogen oxide concentration at the aftertreatment inlet, the nitrogen oxide concentration at the aftertreatment outlet, and the exhaust mass flow rate of the engine are obtained.

[0025] The real-time catalytic reduction efficiency is determined based on the nitrogen oxide concentration at the aftertreatment inlet, the nitrogen oxide concentration at the aftertreatment outlet, and the exhaust gas mass flow rate.

[0026] Secondly, this application also provides an engine exhaust temperature control device, the device comprising:

[0027] The catalytic reduction efficiency determination module is used to determine the real-time catalytic reduction efficiency;

[0028] The exhaust temperature management level determination module is used to determine the exhaust temperature management level of the engine based on the real-time catalytic reduction efficiency; the exhaust temperature management level is used to characterize the degree of adjustment of the engine's aftertreatment temperature.

[0029] The temperature regulation module is used to determine the exhaust temperature management mode that matches the exhaust temperature management mode, and to perform engine exhaust temperature treatment based on the exhaust temperature management mode in order to regulate the engine after-treatment temperature.

[0030] Thirdly, this application also provides an electronic device. The electronic device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to perform the following steps:

[0031] Determine the real-time catalytic reduction efficiency;

[0032] Based on the real-time catalytic reduction efficiency, the exhaust temperature management level of the engine is determined; the exhaust temperature management level is used to characterize the degree of adjustment of the engine's aftertreatment temperature.

[0033] Based on the exhaust temperature management level, a temperature exhaust method matching the exhaust temperature management level is determined, and engine exhaust temperature treatment is performed based on the exhaust temperature method to adjust the engine's after-treatment temperature.

[0034] Fourthly, this application also provides a computer-readable storage medium. The computer-readable storage medium stores a computer program thereon, which, when executed by a processor, performs the following steps:

[0035] Determine the real-time catalytic reduction efficiency;

[0036] Based on the real-time catalytic reduction efficiency, the exhaust temperature management level of the engine is determined; the exhaust temperature management level is used to characterize the degree of adjustment of the engine's aftertreatment temperature.

[0037] Based on the exhaust temperature management level, a temperature exhaust method matching the exhaust temperature management level is determined, and engine exhaust temperature treatment is performed based on the exhaust temperature method to adjust the engine's after-treatment temperature.

[0038] Fifthly, this application also provides a computer program product. The computer program product includes a computer program that, when executed by a processor, performs the following steps:

[0039] Determine the real-time catalytic reduction efficiency;

[0040] Based on the real-time catalytic reduction efficiency, the exhaust temperature management level of the engine is determined; the exhaust temperature management level is used to characterize the degree of adjustment of the engine's aftertreatment temperature.

[0041] Based on the exhaust temperature management level, a temperature exhaust method matching the exhaust temperature management level is determined, and engine exhaust temperature treatment is performed based on the exhaust temperature method to adjust the engine's after-treatment temperature.

[0042] The aforementioned engine exhaust temperature control method, device, electronic equipment, storage medium, and computer program product determine the real-time catalytic reduction efficiency; based on the real-time catalytic reduction efficiency, determine the engine's exhaust temperature management level; the exhaust temperature management level is used to characterize the degree of adjustment to the engine's aftertreatment temperature; according to the exhaust temperature management level, determine the exhaust temperature method matching the exhaust temperature management level, and perform engine exhaust temperature treatment based on the exhaust temperature method to regulate the engine's aftertreatment temperature. In the process of engine exhaust temperature control, by determining the real-time catalytic reduction efficiency, determining the engine's exhaust temperature management level based on the real-time catalytic reduction efficiency, determining the exhaust temperature method matching the exhaust temperature management level, and performing engine exhaust temperature treatment based on the exhaust temperature method to regulate the engine's aftertreatment temperature, multi-level exhaust temperature management is achieved, thereby improving the engine exhaust temperature control efficiency. Attached Figure Description

[0043] Figure 1 This is an application environment diagram of an engine exhaust temperature control method in one embodiment;

[0044] Figure 2 This is a flowchart illustrating an engine exhaust temperature control method in one embodiment;

[0045] Figure 3 This is a schematic diagram of the engine exhaust temperature control process in another embodiment;

[0046] Figure 4This is a structural block diagram of an engine exhaust temperature control device in one embodiment;

[0047] Figure 5 This is a diagram of the internal structure of an electronic device in one embodiment. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0049] The engine exhaust temperature control method provided in this application embodiment can be applied to, for example, Figure 1 The engine exhaust temperature control system shown. Among them, Figure 1 The engine exhaust temperature control system shown may include an exhaust temperature management control unit, an exhaust temperature management drive unit, an exhaust mass flow measurement unit, an analog-to-digital signal conversion unit, an aftertreatment inlet NOx (nitrogen oxides) sensor, an aftertreatment outlet NOx sensor, an intake throttle valve, an exhaust temperature management valve, and fuel injectors. The analog-to-digital signal conversion unit receives signals from the exhaust mass flow measurement unit, the aftertreatment inlet NOx sensor, and the aftertreatment outlet NOx sensor, converts the signals into digital signals, and sends them to the exhaust temperature management control unit. The exhaust temperature management control unit outputs an exhaust temperature management control signal, which drives the intake throttle valve, the exhaust temperature management valve, and the fuel injectors to perform the exhaust temperature management function through the exhaust temperature management drive unit.

[0050] The exhaust temperature management control unit can be an electronic device, specifically a controller installed on the vehicle. The controller can be a control motherboard, on which devices such as a CPU (Central Processing Unit) and MCU (Micro Control Unit) can be installed.

[0051] In one embodiment, the controller determines the real-time catalytic reduction efficiency; based on the real-time catalytic reduction efficiency, it determines the exhaust temperature management level of the engine; the exhaust temperature management level is used to characterize the degree of adjustment of the engine's aftertreatment temperature; according to the exhaust temperature management level, it determines the exhaust temperature method that matches the exhaust temperature management level, and performs engine exhaust temperature treatment based on the exhaust temperature method to adjust the engine's aftertreatment temperature.

[0052] In one embodiment, such as Figure 2 As shown, an engine exhaust temperature control method is provided, which is applied to... Figure 1 Taking the exhaust temperature management control unit as an example, in this embodiment, the exhaust temperature management control unit can be a controller on the vehicle, including the following steps.

[0053] Step 202: Determine the real-time catalytic reduction efficiency.

[0054] Among them, real-time catalytic reduction efficiency refers to the engine's catalytic reduction efficiency calculated in real time. Real-time catalytic reduction efficiency is also known as SCR (catalytic reduction) efficiency. The controller can calculate the real-time catalytic reduction efficiency by acquiring the exhaust mass flow rate, after-treatment inlet NOx concentration, and after-treatment outlet NOx concentration during vehicle operation.

[0055] Step 204: Based on the real-time catalytic reduction efficiency, determine the exhaust temperature management level of the engine; the exhaust temperature management level is used to characterize the degree of adjustment of the engine's aftertreatment temperature.

[0056] The exhaust temperature management level refers to the degree of adjustment used to regulate the engine's aftertreatment temperature. In practice, a higher exhaust temperature management level results in a greater degree of adjustment to the engine's aftertreatment temperature, or a lower level results in a greater degree of adjustment. The specific setting should be based on actual needs. The exhaust temperature management level corresponds to the real-time catalytic reduction efficiency (RTE). A lower RTE indicates a higher degree of adjustment needed to regulate the aftertreatment temperature, thereby increasing the aftertreatment temperature more quickly and improving the RTE.

[0057] Step 206: Determine the exhaust temperature management method that matches the exhaust temperature management level, and perform engine exhaust temperature treatment based on the exhaust temperature management method to adjust the engine's after-treatment temperature.

[0058] Among them, the exhaust temperature method corresponds to the exhaust temperature management level. Different exhaust temperature management levels correspond to different exhaust temperature methods. After the controller determines the exhaust temperature management level, it can perform engine exhaust temperature processing according to the exhaust temperature method that matches the exhaust temperature management level in order to adjust the engine after-treatment temperature. This enables multi-level exhaust temperature management and improves the efficiency of engine exhaust temperature control.

[0059] In the aforementioned engine exhaust temperature control method, the real-time catalytic reduction efficiency is determined; based on the real-time catalytic reduction efficiency, the engine exhaust temperature management level is determined; the exhaust temperature management level is used to characterize the degree of adjustment to the engine's aftertreatment temperature; according to the exhaust temperature management level, a matching exhaust temperature method is determined, and engine exhaust temperature treatment is performed based on the exhaust temperature method to regulate the engine's aftertreatment temperature. In the process of engine exhaust temperature control, by determining the real-time catalytic reduction efficiency, determining the engine exhaust temperature management level based on the real-time catalytic reduction efficiency, determining the matching exhaust temperature method, and performing engine exhaust temperature treatment based on the exhaust temperature method to regulate the engine's aftertreatment temperature, multi-level exhaust temperature management is achieved, thereby improving the engine exhaust temperature control efficiency.

[0060] In one embodiment, determining the exhaust temperature management level of the engine based on the real-time catalytic reduction efficiency includes: determining the catalytic reduction efficiency range to which the real-time catalytic reduction efficiency belongs; and determining the exhaust temperature management level of the engine based on the catalytic reduction efficiency range.

[0061] The catalytic reduction efficiency range refers to a set range of catalytic reduction efficiencies. This range can correspond to different exhaust temperature management levels, with each range corresponding to a specific level. The controller can have multiple preset catalytic reduction efficiency ranges. By matching the catalytic reduction efficiency with each range, the controller determines the range to which the real-time catalytic reduction efficiency belongs, and based on this range, determines the engine's exhaust temperature management level.

[0062] In this embodiment, the controller determines the catalytic reduction efficiency range to which the catalytic reduction efficiency belongs, and determines the exhaust temperature management level of the engine based on the catalytic reduction efficiency range. Since the catalytic reduction efficiency range and the exhaust temperature management level are in one-to-one correspondence, the controller can efficiently and accurately determine the exhaust temperature management level.

[0063] In one embodiment, the catalytic reduction efficiency range is divided into multiple intervals sorted from high to low according to the numerical range of the theoretical catalytic reduction efficiency. Each interval corresponds to a temperature management level, and the temperature adjustment degree of the temperature management level of each interval increases sequentially.

[0064] The theoretical catalytic reduction efficiency (CRE) refers to the CRE efficiency that the engine can theoretically achieve. The numerical range of the theoretical CRE efficiency refers to the range within which the theoretical CRE efficiency can be achieved. For example, the numerical range of the theoretical CRE efficiency can include 0-100%, 0-90%, 60%-90%, and 40%-100%, etc. The controller can divide the numerical range sequentially to obtain multiple consecutive intervals and sort the intervals according to their numerical values, i.e., from high to low. Each CRE efficiency interval corresponds to an exhaust temperature management level. When the efficiency is higher, the degree of temperature adjustment required is relatively lower. Therefore, after dividing the numerical range of the theoretical CRE efficiency, if the intervals are sorted from high to low, the degree of temperature adjustment for the exhaust temperature management level in each interval increases sequentially.

[0065] Specifically, the theoretical catalytic reduction efficiency can range from 0% to 90%. The controller can divide this range into several intervals: 85%–90%, 80%–85%, 75%–80%, 70%–75%, 65%–70%, 60%–65%, and below 60%. The controller further sorts these intervals from highest to lowest efficiency to obtain an ordered catalytic reduction efficiency range. Each of these intervals—85%–90%, 80%–85%, 75%–80%, 70%–75%, 65%–70%, 60%–65%, and below 60%—corresponds to a specific temperature management level. The temperature adjustment level is lowest for 85%–90% and highest for below 60%.

[0066] In this embodiment, the controller determines multiple catalytic reduction efficiency ranges, each of which corresponds to an exhaust temperature management level, thereby enabling multi-level exhaust temperature management and improving engine exhaust temperature control efficiency.

[0067] In one embodiment, the exhaust temperature management hierarchy is divided into a first exhaust temperature management hierarchy, a second exhaust temperature management hierarchy, a third exhaust temperature management hierarchy, a fourth exhaust temperature management hierarchy, a fifth exhaust temperature management hierarchy, a sixth exhaust temperature management hierarchy, and a seventh exhaust temperature management hierarchy. The first exhaust temperature management hierarchy includes a combined exhaust temperature management method that adjusts the intake throttle valve, the exhaust temperature management valve, and the fuel injector. The second exhaust temperature management hierarchy includes a combined exhaust temperature management method that adjusts the exhaust temperature management valve and the fuel injector. The third exhaust temperature management hierarchy includes a combined exhaust temperature management method that adjusts the intake throttle valve and the fuel injector. The fourth exhaust temperature management hierarchy includes a combined exhaust temperature management method that adjusts the intake throttle valve and the exhaust temperature management valve. The fifth exhaust temperature management hierarchy includes a single exhaust temperature management method that adjusts the fuel injector. The sixth exhaust temperature management hierarchy includes a single exhaust temperature management method that adjusts the exhaust temperature management valve. The seventh exhaust temperature management hierarchy includes a single exhaust temperature management method that adjusts the intake throttle valve. The temperature adjustment capability of the fuel injector is greater than that of the exhaust temperature management valve, and the temperature adjustment capability of the exhaust temperature management valve is greater than that of the intake throttle valve.

[0068] The exhaust temperature management level can include seven levels: the first, second, third, fourth, fifth, sixth, and seventh exhaust temperature management levels. The exhaust temperature management methods will also differ depending on the exhaust temperature management level. In this embodiment, the main exhaust temperature management methods include combined exhaust temperature management and single exhaust temperature management. Combined exhaust temperature management refers to adjusting the exhaust temperature of multiple structures at the same time, while single exhaust temperature management refers to adjusting the exhaust temperature of only one structure. The degree of adjustment of the post-processing temperature by the combined exhaust temperature management method is higher than that by the single exhaust temperature management method.

[0069] The combined exhaust temperature control method can include adjusting the intake throttle valve, exhaust temperature management valve, and fuel injector, or it can be obtained by combining any two of these components. The single exhaust temperature control method can be determined based on any one of these components. The fuel injector has a greater temperature control capability than the exhaust temperature management valve, which in turn has a greater temperature control capability than the intake throttle valve. In other words, when adjusting the fuel injector, exhaust temperature management valve, and intake throttle valve individually, the fuel injector has the highest impact on the aftertreatment temperature, followed by the exhaust temperature management valve, and the intake throttle valve has the lowest impact.

[0070] In this embodiment, by setting multiple exhaust temperature management levels, and each exhaust temperature management level corresponds to a corresponding exhaust temperature method, the degree of adjustment of the aftertreatment temperature by different exhaust temperature methods is different, thereby effectively improving the engine exhaust temperature control efficiency.

[0071] In one embodiment, engine exhaust temperature treatment based on exhaust temperature method to regulate engine aftertreatment temperature includes: if the exhaust temperature method is a combination of adjusting intake throttle valve, exhaust temperature management valve and fuel injector, then reducing the opening of intake throttle valve, reducing the opening of exhaust temperature management valve and increasing the near-after injection quantity of fuel injector to regulate engine aftertreatment temperature; if the exhaust temperature method is a combination of adjusting exhaust temperature management valve and fuel injector, then reducing the opening of exhaust temperature management valve and increasing the near-after injection quantity of fuel injector to regulate engine aftertreatment temperature.

[0072] If the exhaust temperature method is a combination of adjusting the intake throttle valve and the injector, then reduce the opening of the intake throttle valve and increase the amount of fuel injected near and after the injector to adjust the engine's aftertreatment temperature.

[0073] If the exhaust temperature method is a combination of adjusting the intake throttle valve and the exhaust temperature management valve, then reduce the opening of the intake throttle valve and the opening of the exhaust temperature management valve to adjust the engine's aftertreatment temperature.

[0074] If the exhaust temperature method includes adjusting the injector's single exhaust temperature, then increase the amount of fuel injected near the injector to adjust the engine's aftertreatment temperature.

[0075] If the exhaust temperature method is a single exhaust temperature method that includes adjusting the exhaust temperature management valve, then reduce the opening of the exhaust temperature management valve to adjust the engine's aftertreatment temperature.

[0076] If the exhaust temperature method is a single exhaust temperature method that includes adjusting the intake throttle valve, then reduce the opening of the intake throttle valve to adjust the engine's aftertreatment temperature.

[0077] For exhaust temperature control valves and intake throttle valves, aftertreatment temperature is generally adjusted by changing their opening degree. Since a smaller opening degree results in a higher aftertreatment temperature, adjusting these valves involves reducing their opening degree to increase the aftertreatment temperature. Similarly, for fuel injectors, a higher injection volume near the injector tip generally results in a higher aftertreatment temperature. Therefore, adjusting the fuel injectors involves increasing the injection volume near the injector tip. When adjusting the opening degree of the exhaust temperature control valve and intake throttle valve, a preset opening percentage can be used. For example, if the preset percentage is 10%, the opening degree can be reduced by 10% each time to increase the aftertreatment temperature. When adjusting the amount of fuel injected near and behind the nozzle, it can be adjusted according to the preset increase in the amount of fuel injected near and behind the nozzle that needs to be increased at one time. When actually setting the opening ratio and the increase in the amount of fuel injected near and behind the nozzle that needs to be increased at one time, it can be adjusted adaptively based on historical experience and adjustment accuracy requirements.

[0078] Specifically, when the controller controls exhaust temperature according to different exhaust temperature methods, when it includes a combination of adjusting the intake throttle valve, exhaust temperature management valve, and fuel injectors, it can reduce the opening of the exhaust temperature management valve, reduce the opening of the intake throttle valve, and increase the near-after injection quantity of the fuel injectors, thereby increasing the engine exhaust temperature and subsequently the aftertreatment temperature. When it includes a combination of the exhaust temperature management valve and fuel injectors, it reduces the opening of the exhaust temperature management valve and increases the near-after injection quantity of the fuel injectors, thus increasing the engine exhaust temperature and subsequently the aftertreatment temperature. When it includes a combination of the intake throttle valve and fuel injectors, it reduces the opening of the intake throttle valve and increases the near-after injection quantity of the fuel injectors, thus increasing the engine exhaust temperature and subsequently the aftertreatment temperature. When it includes a combination of the intake throttle valve and the exhaust temperature management valve, it reduces the opening of both the intake throttle valve and the exhaust temperature management valve, thus increasing the engine exhaust temperature and subsequently the aftertreatment temperature.

[0079] In one embodiment, after the controller adjusts the aftertreatment temperature using any exhaust temperature method, it can recalculate the real-time catalytic reduction efficiency and redetermine the exhaust temperature management level of the engine. If the exhaust temperature management level is still the current exhaust temperature management level, the exhaust temperature can still be adjusted according to the exhaust temperature method corresponding to the exhaust temperature management level. If the exhaust temperature management level changes, the current exhaust temperature method can be updated, and a new exhaust temperature method corresponding to the new exhaust temperature management level can be selected to adjust the aftertreatment temperature. This can improve the flexibility of engine exhaust temperature control and improve the efficiency of engine exhaust temperature control.

[0080] In this embodiment, the controller adjusts the engine aftertreatment temperature according to the exhaust temperature management level, thereby enabling multi-level temperature regulation and improving the engine exhaust temperature control efficiency.

[0081] In one embodiment, determining the real-time catalytic reduction efficiency includes: acquiring the nitrogen oxide concentration at the engine's aftertreatment inlet, the nitrogen oxide concentration at the aftertreatment outlet, and the exhaust mass flow rate; and determining the real-time catalytic reduction efficiency based on the nitrogen oxide concentration at the aftertreatment inlet, the nitrogen oxide concentration at the aftertreatment outlet, and the exhaust mass flow rate.

[0082] The controller can measure the exhaust mass flow rate, NOx concentration at the inlet of the aftertreatment system, and NOx concentration at the outlet of the aftertreatment system using sensors, and calculate the SCR efficiency using the following formula:

[0083]

[0084] Where η is the SCR efficiency, NOxUs is the NOx concentration at the inlet of the aftertreatment system, NOxDs is the NOx concentration at the outlet of the aftertreatment system, MfExh is the exhaust gas mass flow rate, and K is the proportionality coefficient.

[0085] In this embodiment, the real-time catalytic reduction efficiency can be accurately calculated using the SCR efficiency calculation formula.

[0086] In one embodiment, such as Figure 3 The diagram shown is a flowchart of an engine exhaust temperature control method in one embodiment:

[0087] First, the controller can measure the exhaust mass flow rate, the NOx concentration at the inlet of the aftertreatment system, and the NOx concentration at the outlet of the aftertreatment system using sensors. Based on the measured exhaust mass flow rate, the NOx concentration at the inlet of the aftertreatment system, and the NOx concentration at the outlet of the aftertreatment system, the SCR efficiency η can be calculated.

[0088] Based on the calculated SCR efficiency η, a corresponding exhaust temperature method can be selected. Specifically, the exhaust temperature method can include the following seven options: adjusting the intake throttle valve; adjusting the exhaust temperature management valve; adjusting the near-rear injection quantity of the injector; simultaneously adjusting the intake throttle valve and the exhaust temperature management valve; simultaneously adjusting the intake throttle valve and the near-rear injection quantity of the injector; simultaneously adjusting the exhaust temperature management valve and the near-rear injection quantity of the injector; and simultaneously adjusting the intake throttle valve, the exhaust temperature management valve, and the near-rear injection quantity of the injector. Thus, the controller can select from these seven exhaust temperature methods based on the SCR efficiency η.

[0089] When the SCR efficiency is between 85% and 90%, the method of increasing the aftertreatment temperature is adopted, namely, reducing the intake throttle valve opening, increasing the engine exhaust temperature, and thus increasing the aftertreatment temperature.

[0090] When the SCR efficiency is between 80% and 85%, the aftertreatment temperature is increased by method 2, which involves reducing the opening of the exhaust temperature management valve to increase the engine exhaust temperature and thus the aftertreatment temperature.

[0091] When the SCR efficiency is between 75% and 80%, the method of increasing the aftertreatment temperature is adopted, namely, increasing the amount of fuel injected near the engine injector, increasing the engine exhaust temperature, and thus increasing the aftertreatment temperature.

[0092] When the SCR efficiency is between 70% and 75%, the aftertreatment temperature is increased by method 4, which involves simultaneously reducing the opening of the intake throttle valve and the exhaust temperature management valve to increase the engine exhaust temperature, thereby increasing the aftertreatment temperature.

[0093] When the SCR efficiency is between 65% and 70%, the aftertreatment temperature is increased by method 5, which involves simultaneously reducing the intake throttle valve opening and increasing the near-after injection fuel quantity of the injectors to increase the engine exhaust temperature, thereby increasing the aftertreatment temperature.

[0094] When the SCR efficiency is between 60% and 65%, the aftertreatment temperature is increased by method 6, which involves simultaneously reducing the opening of the exhaust temperature management valve and increasing the amount of fuel injected near the injector to increase the engine exhaust temperature, thereby increasing the aftertreatment temperature.

[0095] When the SCR efficiency is below 60%, the aftertreatment temperature is increased using method 7, which involves simultaneously reducing the opening of the exhaust temperature management valve, reducing the opening of the intake throttle valve, and increasing the near-after injection quantity of the fuel injectors to increase the engine exhaust temperature, thereby increasing the aftertreatment temperature. The engine exhaust temperature management method of this application takes into account the SCR response capability, achieves multi-stage exhaust temperature management, and improves the efficiency of engine exhaust temperature management.

[0096] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0097] Based on the same inventive concept, this application also provides an engine exhaust temperature control device for implementing the engine exhaust temperature control method described above. The solution provided by this device is similar to the solution described in the above method; therefore, the specific limitations of one or more engine exhaust temperature control device embodiments provided below can be found in the limitations of the engine exhaust temperature control method described above, and will not be repeated here.

[0098] In one embodiment, such as Figure 4 As shown, an engine exhaust temperature control device 400 is provided, including: a catalytic reduction efficiency determination module 402, an exhaust temperature management level determination module 404, and a temperature regulation module 406, wherein:

[0099] The catalytic reduction efficiency determination module 402 is used to determine the real-time catalytic reduction efficiency.

[0100] The exhaust temperature management level determination module 404 is used to determine the exhaust temperature management level of the engine based on the real-time catalytic reduction efficiency; the exhaust temperature management level is used to characterize the degree of adjustment of the engine's aftertreatment temperature.

[0101] The temperature regulation module 406 is used to determine the exhaust temperature management mode that matches the exhaust temperature management level according to the exhaust temperature management level, and to perform engine exhaust temperature treatment based on the exhaust temperature management mode in order to regulate the engine after-treatment temperature.

[0102] In one embodiment, the exhaust temperature management level determination module 404 is further configured to determine the catalytic reduction efficiency range to which the catalytic reduction efficiency belongs; and determine the exhaust temperature management level of the engine based on the catalytic reduction efficiency range.

[0103] In one embodiment, the catalytic reduction efficiency range is divided into multiple intervals sorted from high to low according to the numerical range of the theoretical catalytic reduction efficiency. Each interval corresponds to a temperature management level, and the temperature adjustment degree of the temperature management level of each interval increases sequentially.

[0104] In one embodiment, the exhaust temperature management hierarchy is divided into a first exhaust temperature management hierarchy, a second exhaust temperature management hierarchy, a third exhaust temperature management hierarchy, a fourth exhaust temperature management hierarchy, a fifth exhaust temperature management hierarchy, a sixth exhaust temperature management hierarchy, and a seventh exhaust temperature management hierarchy. The first exhaust temperature management hierarchy includes a combined exhaust temperature management method that adjusts the intake throttle valve, the exhaust temperature management valve, and the fuel injector. The second exhaust temperature management hierarchy includes a combined exhaust temperature management method that adjusts the exhaust temperature management valve and the fuel injector. The third exhaust temperature management hierarchy includes a combined exhaust temperature management method that adjusts the intake throttle valve and the fuel injector. The fourth exhaust temperature management hierarchy includes a combined exhaust temperature management method that adjusts the intake throttle valve and the exhaust temperature management valve. The fifth exhaust temperature management hierarchy includes a single exhaust temperature management method that adjusts the fuel injector. The sixth exhaust temperature management hierarchy includes a single exhaust temperature management method that adjusts the exhaust temperature management valve. The seventh exhaust temperature management hierarchy includes a single exhaust temperature management method that adjusts the intake throttle valve. The temperature adjustment capability of the fuel injector is greater than that of the exhaust temperature management valve, and the temperature adjustment capability of the exhaust temperature management valve is greater than that of the intake throttle valve.

[0105] In one embodiment, the temperature regulation module 406 is further configured to, if the exhaust temperature method is a combined exhaust temperature method including adjusting the intake throttle valve, the exhaust temperature management valve, and the injector, reduce the opening of the intake throttle valve, reduce the opening of the exhaust temperature management valve, and increase the near-and-after injection quantity of the injector to regulate the engine's aftertreatment temperature; if the exhaust temperature method is a combined exhaust temperature method including adjusting the exhaust temperature management valve and the injector, reduce the opening of the exhaust temperature management valve and increase the near-and-after injection quantity of the injector to regulate the engine's aftertreatment temperature; if the exhaust temperature method is a combined exhaust temperature method including adjusting the intake throttle valve and the injector, reduce the opening of the intake throttle valve and increase the near-and-after injection quantity of the injector. To regulate the engine's aftertreatment temperature; if the exhaust temperature method is a combined exhaust temperature method that includes adjusting the intake throttle valve and the exhaust temperature management valve, then the opening of the intake throttle valve and the exhaust temperature management valve are reduced to regulate the engine's aftertreatment temperature; if the exhaust temperature method is a single exhaust temperature method that includes adjusting the injectors, then the near-after injection quantity of the injectors is increased to regulate the engine's aftertreatment temperature; if the exhaust temperature method is a single exhaust temperature method that includes adjusting the exhaust temperature management valve, then the opening of the exhaust temperature management valve is reduced to regulate the engine's aftertreatment temperature; if the exhaust temperature method is a single exhaust temperature method that includes adjusting the intake throttle valve, then the opening of the intake throttle valve is reduced to regulate the engine's aftertreatment temperature.

[0106] In one embodiment, the catalytic reduction efficiency determination module 402 is further configured to acquire the nitrogen oxide concentration at the engine's aftertreatment inlet, the nitrogen oxide concentration at the aftertreatment outlet, and the exhaust mass flow rate; and to determine the real-time catalytic reduction efficiency based on the nitrogen oxide concentration at the aftertreatment inlet, the nitrogen oxide concentration at the aftertreatment outlet, and the exhaust mass flow rate.

[0107] Each module in the aforementioned engine exhaust temperature control device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of the electronic device in hardware form or independently of it, or stored in the memory of the electronic device in software form, so that the processor can call and execute the corresponding operations of each module.

[0108] In one embodiment, an electronic device is provided, which may be a controller in a vehicle, and its internal structure diagram may be as follows: Figure 5 As shown.

[0109] The controller includes a processor, memory, and input / output interfaces. The memory is connected to the processor, and the processor is connected to the input / output interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides the environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The processor's input / output interfaces are used for exchanging information between the processor and other controllers. When the computer program is executed by the processor, it implements an engine exhaust temperature management method.

[0110] Those skilled in the art will understand that Figure 5 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the electronic device to which the present application is applied. The specific electronic device may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements.

[0111] In one embodiment, an electronic device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0112] Determine the real-time catalytic reduction efficiency;

[0113] Based on real-time catalytic reduction efficiency, the exhaust temperature management level of the engine is determined; the exhaust temperature management level is used to characterize the degree of adjustment of the engine's aftertreatment temperature.

[0114] Based on the exhaust temperature management level, determine the exhaust temperature method that matches the exhaust temperature management level, and perform engine exhaust temperature treatment based on the exhaust temperature method to regulate the engine's after-treatment temperature.

[0115] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0116] Determine the real-time catalytic reduction efficiency;

[0117] Based on real-time catalytic reduction efficiency, the exhaust temperature management level of the engine is determined; the exhaust temperature management level is used to characterize the degree of adjustment of the engine's aftertreatment temperature.

[0118] Based on the exhaust temperature management level, determine the exhaust temperature method that matches the exhaust temperature management level, and perform engine exhaust temperature treatment based on the exhaust temperature method to regulate the engine's after-treatment temperature.

[0119] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0120] Determine the real-time catalytic reduction efficiency;

[0121] Based on real-time catalytic reduction efficiency, the exhaust temperature management level of the engine is determined; the exhaust temperature management level is used to characterize the degree of adjustment of the engine's aftertreatment temperature.

[0122] Based on the exhaust temperature management level, determine the exhaust temperature method that matches the exhaust temperature management level, and perform engine exhaust temperature treatment based on the exhaust temperature method to regulate the engine's after-treatment temperature.

[0123] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data shall comply with the relevant laws, regulations and standards of the relevant countries and regions.

[0124] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0125] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0126] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. An engine exhaust temperature control method characterized by, The method comprises: determining real-time catalytic reduction efficiency; determining a catalytic reduction efficiency interval to which the catalytic reduction efficiency belongs, and determining an exhaust temperature management level of the engine according to the catalytic reduction efficiency interval; the catalytic reduction efficiency interval is divided into multiple intervals in descending order according to the numerical range of the theoretical catalytic reduction efficiency, and each interval corresponds to an exhaust temperature management level; the exhaust temperature management level is used to represent the adjustment degree of adjusting the aftertreatment temperature of the engine, and the temperature adjustment degree of each interval is sequentially increased; the exhaust temperature management levels are different, and the exhaust temperature management mode comprises a combined exhaust temperature management mode and a single exhaust temperature management mode; the combined exhaust temperature management mode comprises a combination of an intake throttle valve, an exhaust temperature management valve and an oil injector, or a combination of any two structures of the intake throttle valve, the exhaust temperature management valve and the oil injector; the single exhaust temperature management mode is determined according to any one structure of the intake throttle valve, the exhaust temperature management valve and the oil injector; the temperature adjustment degree of the oil injector is greater than that of the exhaust temperature management valve, and the temperature adjustment degree of the exhaust temperature management valve is greater than that of the intake throttle valve; determining an exhaust temperature management mode matched with the exhaust temperature management level according to the exhaust temperature management level, and performing engine exhaust temperature treatment based on the exhaust temperature management mode to adjust the aftertreatment temperature of the engine.

2. The method of claim 1, wherein, The exhaust temperature management levels are divided into a first exhaust temperature management level, a second exhaust temperature management level, a third exhaust temperature management level, a fourth exhaust temperature management level, a fifth exhaust temperature management level, a sixth exhaust temperature management level and a seventh exhaust temperature management level; The exhaust temperature management mode of the first exhaust temperature management level comprises a combined exhaust temperature management mode of adjusting the intake throttle valve, the exhaust temperature management valve and the oil injector; the second exhaust temperature management level comprises a combined exhaust temperature management mode of adjusting the exhaust temperature management valve and the oil injector; the third exhaust temperature management level comprises a combined exhaust temperature management mode of adjusting the intake throttle valve and the oil injector; the fourth exhaust temperature management level comprises a combined exhaust temperature management mode of adjusting the intake throttle valve and the exhaust temperature management valve; the fifth exhaust temperature management level comprises a single exhaust temperature management mode of adjusting the oil injector; the sixth exhaust temperature management level comprises a single exhaust temperature management mode of adjusting the exhaust temperature management valve; and the seventh exhaust temperature management level comprises a single exhaust temperature management mode of adjusting the intake throttle valve, wherein the temperature adjustment degree of the oil injector is greater than that of the exhaust temperature management valve, and the temperature adjustment degree of the exhaust temperature management valve is greater than that of the intake throttle valve.

3. The method of claim 1, wherein, The engine exhaust temperature treatment based on the exhaust temperature management mode to adjust the aftertreatment temperature of the engine comprises: if the exhaust temperature management mode is a combined exhaust temperature management mode comprising adjusting the intake throttle valve, the exhaust temperature management valve and the oil injector, then reducing the opening degree of the intake throttle valve, reducing the opening degree of the exhaust temperature management valve and increasing the near-after injection amount of the oil injector to adjust the aftertreatment temperature of the engine; if the exhaust temperature management mode is a combined exhaust temperature management mode comprising adjusting the exhaust temperature management valve and the oil injector, then reducing the opening degree of the exhaust temperature management valve and increasing the near-after injection amount of the oil injector to adjust the aftertreatment temperature of the engine; If the exhaust temperature mode is a combined exhaust temperature mode including adjustment of the intake throttle valve and the injection of the post-injection, the opening of the intake throttle valve is decreased and the post-injection amount of the post-injection is increased to adjust the exhaust temperature of the engine; If the exhaust temperature mode is a combined exhaust temperature mode including adjustment of the intake throttle valve and the exhaust temperature management valve, the opening of the intake throttle valve is decreased and the opening of the exhaust temperature management valve is decreased to adjust the exhaust temperature of the engine; If the exhaust temperature mode is a single exhaust temperature mode including adjustment of the injection of the post-injection, the post-injection amount of the post-injection is increased to adjust the exhaust temperature of the engine; If the exhaust temperature mode is a single exhaust temperature mode including adjustment of the exhaust temperature management valve, the opening of the exhaust temperature management valve is decreased to adjust the exhaust temperature of the engine; If the exhaust temperature mode is a single exhaust temperature mode including adjustment of the intake throttle valve, the opening of the intake throttle valve is decreased to adjust the exhaust temperature of the engine.

4. The method of claim 1, wherein, The method further comprises: acquiring the exhaust temperature management level of the engine; determining the real-time catalytic reduction efficiency based on the exhaust temperature management level of the engine.

5. The method of claim 1, wherein, The method further comprises: after the adjustment of the exhaust temperature of the engine by any exhaust temperature mode, re-determining the real-time catalytic reduction efficiency and the exhaust temperature management level of the engine; if the re-determined exhaust temperature management level is the current exhaust temperature management level, the exhaust temperature is adjusted according to the exhaust temperature mode corresponding to the current exhaust temperature management level; if the re-determined exhaust temperature management level is changed, the current exhaust temperature mode is updated and a new exhaust temperature mode corresponding to the re-determined exhaust temperature management level is selected to adjust the exhaust temperature of the engine.

6. The method of claim 1, wherein, Each of the catalytic reduction efficiency intervals corresponds to an exhaust temperature management level; when the numerical ranges of the catalytic reduction efficiency intervals are sorted from high to low, the temperature adjustment degree of the exhaust temperature management levels of the catalytic reduction efficiency intervals is increased in turn.

7. An engine exhaust temperature control device characterized by comprising: The device comprises: a catalytic reduction efficiency determination module for determining the real-time catalytic reduction efficiency; The exhaust temperature management level determination module is configured to determine a catalytic reduction efficiency interval to which the catalytic reduction efficiency belongs, and determine an exhaust temperature management level of the engine according to the catalytic reduction efficiency interval; the catalytic reduction efficiency interval is divided into a plurality of intervals ranked from high to low according to a numerical range of a theoretical catalytic reduction efficiency, each interval corresponding to an exhaust temperature management level, the exhaust temperature management level being used to represent an adjustment degree of adjusting the aftertreatment temperature of the engine, and the temperature adjustment degrees of the exhaust temperature management levels of the intervals being sequentially increased; the exhaust temperature management modes of the exhaust temperature management levels are different, the exhaust temperature management modes including a combined exhaust temperature management mode and a single exhaust temperature management mode, the combined exhaust temperature management mode including a combination of an intake throttle valve, an exhaust temperature management valve and an oil injector, or a combination of any two structures of the intake throttle valve, the exhaust temperature management valve and the oil injector; the single exhaust temperature management mode is determined according to any one structure of the intake throttle valve, the exhaust temperature management valve and the oil injector, the temperature adjustment degree of the oil injector being greater than that of the exhaust temperature management valve, and the temperature adjustment degree of the exhaust temperature management valve being greater than that of the intake throttle valve; The temperature adjustment module is configured to determine an exhaust temperature management mode matched with the exhaust temperature management level according to the exhaust temperature management level, and perform exhaust temperature treatment of the engine based on the exhaust temperature management mode to adjust the aftertreatment temperature of the engine. 8.An electronic device comprising a memory and a processor, the memory storing a computer program, wherein, The processor executes the computer program to implement the steps of the method of any one of claims 1 to 6.

9. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to implement the steps of the method of any one of claims 1 to 6.

10. A computer program product comprising a computer program, characterized in that, The computer program is executed by the processor to implement the steps of the method of any one of claims 1 to 6. The computer program is executed by the processor to implement the steps of the method of any one of claims 1 to 6.

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