DPF regeneration method and device, vehicle, medium and program product

Abstract

The invention relates to the technical field of automobile aftertreatment, in particular to a DPF regeneration method and device, a vehicle, a medium and a program product. The method comprises the steps that after it is determined that a diesel particulate filter (DPF) regeneration stage is entered, the total amount of current residual diesel oil on the inner wall of an air cylinder is obtained; determining the dilution degree of engine oil in a vehicle oil pan based on the total amount of the current residual diesel oil on the inner wall of the air cylinder; and if the dilution degree of the engine oil exceeds the first dilution degree, the amount of diesel oil sprayed out in the current remote after-injection process is reduced to a preset value from a reference value, so that the DPF is regenerated according to the preset temperature. Through the method, engine oil dilution can be slowed down, and then normal operation of the engine is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of automobile aftertreatment technology, and in particular to a DPF regeneration method, equipment, vehicle, medium and program product. Background Art

[0002] At present, the active regeneration control technology of the engine particulate filter (DPF) based on far afterinjection (a small amount of fuel is injected again at a position far away from the top dead center to produce a large amount of unburned HC and CO) (after the carbon soot and other particulates in the DPF are captured to a certain limit, the exhaust temperature or the DPF filter element temperature is increased by external energy to reach the ignition temperature of the particles to remove the accumulated carbon soot) is widely used. It mainly increases the engine exhaust temperature by far afterinjection of diesel to actively regenerate the DPF.

[0003] However, the atomization effect of the existing diesel remote spray is not very good, and the diesel is often sprayed onto the inner wall of the cylinder. The diesel on the inner wall condenses into larger liquid particles, and during the operation of the piston, passes through the oil return hole of the oil ring, and then enters the oil pan through the crankcase, mixes with the engine oil, dilutes the engine oil in the oil pan, and may cause damage to the engine. Summary of the invention

[0004] The present application provides a DPF regeneration method, device, vehicle, medium and program product, which can reduce oil dilution and thus ensure the normal operation of the engine.

[0005] In a first aspect, an embodiment of the present application provides a DPF regeneration method, the method comprising: After entering the DPF regeneration phase, the total amount of diesel remaining on the cylinder inner wall is obtained, wherein the total amount of diesel remaining on the cylinder inner wall is obtained by accumulating the amount of diesel remaining on the cylinder inner wall during each previous far post injection process; Determining the dilution degree of the engine oil in the oil pan of the vehicle based on the total amount of diesel remaining on the inner wall of the cylinder at present; If the dilution degree of the engine oil exceeds the first dilution degree, the amount of diesel sprayed during the current far post injection process is reduced from a reference value to a preset value so that the DPF is regenerated according to a preset temperature, wherein the amount of diesel sprayed during the far post injection process corresponds to the regeneration temperature of the DPF, and the reference value represents the amount of diesel sprayed during the far post injection process when the DPF is regenerated according to the reference temperature.

[0006] In a possible implementation manner, the amount of diesel remaining on the inner wall of the cylinder during any one remote post-injection process is determined by: Determine the amount of fuel consumed during any one of the remote post-injection processes based on the collected exhaust flow rate of the engine, the intake temperature of the DPF, and the intake temperature of the oxidation catalyst during any one of the remote post-injection processes; Based on the amount of diesel injected during any one of the long after injection processes and the difference between the amount of fuel consumed, the amount of diesel remaining on the inner wall of the cylinder during any one of the long after injection processes is obtained.

[0007] In a possible implementation manner, the amount of oil consumed during any one remote after-spray process satisfies the following formula: , Among them, Q represents the amount of fuel consumed, L represents the exhaust flow rate of the engine, ΔT represents the difference between the intake temperature of the DPF and the intake temperature of the oxidation catalyst, f represents the conversion efficiency of the oxidation catalyst, a represents the specific heat capacity of diesel, and b represents the heat generated by the combustion of diesel per unit mass.

[0008] In a possible implementation, the method further includes: If the dilution degree of the engine oil exceeds a second dilution degree, DPF regeneration is performed by adjusting the throttle opening, and the second dilution degree is greater than the first dilution degree.

[0009] In a possible implementation, the method further includes: If the dilution degree of the engine oil does not exceed the first dilution degree, the amount of diesel injected during the current far post injection process is set as the reference value, so that the DPF is regenerated according to the reference temperature.

[0010] In a possible implementation manner, before obtaining the total amount of diesel remaining on the inner wall of the cylinder, the method further includes: If it is detected that the engine oil has been replaced, the locally recorded total amount of diesel remaining on the inner wall of the cylinder is replaced with a preset value.

[0011] In a second aspect, an embodiment of the present application provides a DPF regeneration device, the device comprising: An acquisition module, used to determine the total amount of diesel remaining on the inner wall of the cylinder after entering the DPF regeneration phase, wherein the total amount of diesel remaining on the inner wall of the cylinder is obtained by accumulating the amount of diesel remaining on the inner wall of the cylinder during each previous far post injection process; A dilution degree determination module, used to determine the dilution degree of the engine oil in the oil pan of the vehicle based on the total amount of diesel remaining on the inner wall of the current cylinder; A regeneration module is used to reduce the amount of diesel sprayed during the current far post injection process from a reference value to a preset value when the dilution degree of the engine oil exceeds a first dilution degree, so that the DPF is regenerated according to a preset temperature, wherein the amount of diesel sprayed during the far post injection process corresponds to the regeneration temperature of the DPF, and the reference value represents the amount of diesel sprayed during the far post injection process when the DPF is regenerated according to the reference temperature.

[0012] In a third aspect, an embodiment of the present application provides an electronic device, the electronic device comprising: At least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor executes the method as described in the first aspect above.

[0013] In a fourth aspect, an embodiment of the present application provides a vehicle, which includes the electronic device as described in the third aspect above.

[0014] In a fifth aspect, an embodiment of the present application provides a computer storage medium, wherein the computer storage medium stores a computer program, and the computer program is used to enable a computer to execute the method in the first aspect as described above.

[0015] In a sixth aspect, an embodiment of the present application provides a computer program product, which implements the method in the first aspect above when the computer program is executed by a processor.

[0016] An embodiment of the present application provides a DPF regeneration method, which evaluates the dilution degree of the engine oil based on the total amount of diesel remaining on the inner wall of the cylinder, and can obtain a relatively accurate evaluation result; moreover, based on the range of the dilution degree, a corresponding DPF regeneration method is adopted, which not only ensures the smooth regeneration of the DPF, but also slows down the dilution of the engine oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic flow chart of a DPF regeneration method according to an exemplary embodiment of the present invention; Figure 2 A schematic diagram of a specific process of a DPF regeneration method according to an exemplary embodiment of the present invention; Figure 3 A schematic diagram of a DPF regeneration device according to an exemplary embodiment of the present invention; Figure 4 A schematic diagram of an electronic device according to an exemplary embodiment of the present invention; Figure 5 FIG. 2 is a schematic diagram of a vehicle according to an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiment of the present application will be clearly and completely described below in conjunction with the drawings in the embodiment of the present application. Obviously, the described embodiment is only a part of the embodiment of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be arbitrarily combined with each other. In addition, although the logical order is shown in the flow chart, in some cases, the steps shown or described can be performed in an order different from that here.

[0019] The acquisition, storage, use, and processing of data in the embodiments of this application comply with the relevant provisions of national laws and regulations.

[0020] First, some concepts involved in the embodiments of the present application are introduced.

[0021] DPF: also known as particulate matter collector, also known as diesel particulate filter, is installed in the engine exhaust system. It is a particulate matter filter with a porous carrier medium as the filter element. When the exhaust gas flows through the porous wall, the particulate matter is captured in the porous wall or deposited on the wall.

[0022] Diesel Oxidation Catalyst (DOC): Installed in the engine exhaust system, it is a device that can reduce the amount of pollutants in the exhaust through various physical and chemical effects, that is, oxidizing hydrocarbons. The conversion efficiency of DOC is the efficiency of converting carbon monoxide and hydrocarbons into carbon dioxide and water. When the DOC is operating normally, the conversion efficiency is a fixed value.

[0023] Remote post-injection regeneration: At a certain moment after the piston top dead center (generally when the crankshaft rotation angle after the top dead center is 100°A~160°A), the injector sprays fuel into the cylinder, and the incompletely burned HC (Hydrocarbon) exhaust gas enters the exhaust pipe. The DOC releases heat to oxidize the HC, increasing the DPF temperature to achieve active regeneration.

[0024] The degree of dilution of engine oil: It represents the amount of diesel mixed in the engine oil. The more diesel mixed in the engine oil, the greater the degree of dilution of the engine oil.

[0025] DPF regeneration: Through hydrocarbon injection, the DPF temperature reaches the regeneration temperature and the carbon deposits of DPF are burned off. DPF regeneration can be divided into low-temperature regeneration and high-temperature regeneration.

[0026] The DPF regeneration method in the embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0027] In view of the problem that the oil in the oil pan of the vehicle is diluted during the DPF regeneration process, the embodiment of the present application provides a DPF regeneration method, such as Figure 1 As shown, the method includes: S101: After determining that the DPF regeneration phase has begun, the total amount of diesel remaining on the inner wall of the cylinder is obtained.

[0028] The most common DPF regeneration method is active regeneration by remote post-injection. However, during the remote post-injection regeneration process, diesel will remain on the inner wall of the cylinder. The residual diesel may flow into the oil pan and mix with the engine oil to dilute the engine oil. Therefore, after entering the DPF regeneration stage, the total amount of diesel remaining on the inner wall of the cylinder must be obtained first to accurately determine the dilution degree of the engine oil. The total amount of diesel remaining on the inner wall of the cylinder is recorded locally and is obtained by accumulating the amount of diesel remaining on the inner wall of the cylinder during each previous remote post-injection process.

[0029] For example, the total amount of diesel remaining on the cylinder wall recorded locally after the last far post injection is a gram. During the current far post injection, b grams of the far post injection amount remain on the cylinder wall. The total amount of diesel remaining on the cylinder wall recorded locally is updated from a gram to (a+b) grams.

[0030] Specifically, the amount of diesel remaining on the inner wall of the cylinder during any one remote post-injection process may be determined by the following implementation: Determine the amount of fuel consumed during any one of the remote post-injection processes based on the collected exhaust flow rate of the engine, the intake temperature of the DPF, and the intake temperature of the oxidation catalyst during any one of the remote post-injection processes; Based on the amount of diesel injected during any one of the long after injection processes and the difference between the amount of fuel consumed, the amount of diesel remaining on the inner wall of the cylinder during any one of the long after injection processes is obtained.

[0031] Among them, the above consumed oil volume can be obtained by the formula Determine, Q represents the amount of fuel consumed, L represents the exhaust flow of the engine, ΔT is the difference between the intake temperature of the DPF and the intake temperature of the oxidation catalyst, f represents the conversion efficiency of the oxidation catalyst, a represents the specific heat capacity of diesel, and b represents the heat generated by the combustion of diesel per unit mass.

[0032] The intake temperature of the DPF is the temperature before the DPF, the intake temperature of the oxidation catalyst is the temperature before the DOC, and the exhaust flow of the engine, the intake temperature of the DPF and the intake temperature of the oxidation catalyst can all be measured by corresponding sensors. The amount of diesel sprayed during each remote post-injection process is collected and recorded, so the amount of diesel sprayed during any of the remote post-injection processes can also be read locally.

[0033] For example, the amount of diesel consumed in any remote post-injection process obtained by the above formula is Q1 grams, and the amount of diesel consumed in any remote post-injection process read locally is c grams. Among the c grams of diesel injected, part is consumed and part remains on the inner wall of the cylinder. Then the amount of diesel remaining on the inner wall of the cylinder is (c-Q1) grams.

[0034] When the engine oil is diluted to a certain extent, or after the vehicle has traveled a preset mileage, the engine oil will be replaced. Therefore, the above total amount of diesel is accumulated after the engine oil is replaced. If the engine oil is replaced after accumulating to (c-Q1) grams, the total amount of diesel remaining on the cylinder wall recorded locally will be cleared, that is, (c-Q1) grams will be replaced to 0.

[0035] S102: Determine the dilution degree of the engine oil in the oil pan of the vehicle based on the total amount of diesel remaining on the inner wall of the cylinder at present.

[0036] The above-mentioned dilution degree characterizes the amount of diesel mixed into the engine oil. In the embodiment of the present application, the diesel remaining on the inner wall of the cylinder may not all flow into the engine oil. Therefore, a coefficient λ% is set, that is, λ% of the total amount of diesel remaining on the inner wall of the cylinder will flow into the engine oil. The dilution degree is also related to the capacity of the container containing the engine oil. For example, the capacity of the container containing the engine oil is A liters, and the total amount of diesel remaining on the inner wall of the cylinder is a grams. Converted to a volume of l liter, the dilution degree of the engine oil is l×λ% / (A+l).

[0037] In addition, a mapping relationship between the total amount of diesel remaining on the inner wall of the cylinder and the dilution degree of the engine oil can be pre-constructed, so that after obtaining the total amount of diesel remaining on the inner wall of the cylinder, the dilution degree can be queried in the mapping relationship, and the mapping relationship can be shown in Table 1. The mapping relationship shown in Table 1 is for the same capacity (that is, the capacity of the same container for holding engine oil).

[0038] Table 1

[0039] S103: If the dilution degree of the engine oil exceeds the first dilution degree, the amount of diesel injected in the current far post injection process is reduced from a reference value to a preset value, so that the DPF is regenerated according to a preset temperature.

[0040] After determining the current dilution degree of the engine oil, the current dilution degree of the engine oil is compared with a preset dilution degree, and a corresponding DPF regeneration method is determined according to the comparison result, which specifically includes any one of the following.

[0041] (1) The dilution level of the engine oil exceeds the first dilution level but does not exceed the second dilution level. (The first dilution level is less than the second dilution level).

[0042] Generally, the amount of diesel sprayed during each remote post-injection process is the reference value. When the engine oil is diluted, for example, when the dilution degree of the engine oil is between the first dilution degree and the second dilution degree, it is possible to consider reducing the amount of diesel sprayed during this remote post-injection process, that is, reducing it from the reference value to the preset value, thereby reducing the amount of diesel remaining on the inner wall of the cylinder during this remote post-injection process. Since the amount of diesel sprayed during the remote post-injection process corresponds to the regeneration temperature of the DPF (the less the amount of diesel sprayed, the lower the regeneration temperature), the amount of diesel sprayed is reduced to the preset value to ensure the regeneration temperature of the DPF.

[0043] (2) The dilution level of the engine oil exceeds the second dilution level.

[0044] When the dilution degree of the engine oil exceeds the second dilution degree, if the amount of diesel injected is reduced to a smaller value in order to avoid further dilution of the engine oil, the regeneration temperature of the DPF may not be guaranteed. At this time, DPF regeneration can be performed by adjusting the throttle opening instead of using the remote post-injection method.

[0045] Furthermore, an oil change warning message may be further issued to remind the driver to change the oil in time. After the oil is changed, the total amount of diesel remaining on the inner wall currently recorded locally is changed to 0.

[0046] In addition, the amount of diesel injected during the remote post-injection process can be divided into multiple stages according to the dilution degree, as shown in Table 2.

[0047] Table 2

[0048] As shown in Table 2, different dilution ranges correspond to different amounts of diesel injected, c1 is the reference value, c1>c2>c3>0, that is, when the dilution degree of the engine oil is between 2 and 4%, the amount of diesel injected this time is determined to be c3, that is, it is reduced from the reference value c1 to c3; when the dilution degree of the engine oil is determined to be between 4 and 6%, the far-rear injection is stopped, and the DPF regeneration is performed by adjusting the throttle opening. The corresponding relationship in Table 2 only represents one implementation method, and the embodiment of the present application does not limit the specific corresponding relationship between the dilution degree and the amount of diesel injected.

[0049] (3) The dilution level of the engine oil does not exceed the first dilution level.

[0050] When the dilution degree of the engine oil does not exceed the first dilution degree, it indicates that there is no damage to the engine at present, and the far post injection process can continue according to the reference value, that is, the amount of diesel injected in the current far post injection process is set to the reference value, so that the DPF is regenerated according to the reference temperature.

[0051] The following is based on Figure 2 A DPF method provided in an embodiment of the present application is described in detail.

[0052] S201: Determine to enter the particulate matter trap regeneration phase; S202: Determine the dilution degree of the engine oil based on the total amount of diesel remaining on the inner wall of the cylinder currently obtained locally, wherein the total amount of diesel remaining on the inner wall of the cylinder is determined by the implementation method in the above S101, and the dilution degree can be determined by the implementation method in the above S102, which will not be repeated here.

[0053] S203: Whether the dilution degree exceeds the first dilution degree, if so, execute S205, otherwise execute S204; S204: setting the amount of diesel injected during the current far-rear injection process as a reference value, and then ending; S205: Whether the dilution degree exceeds the second dilution degree, if so, execute S206, otherwise execute S207; S206: regenerating the DPF by adjusting the throttle opening, and then ending; S207: Reduce the amount of diesel injected during the current far-after injection process from a reference value to a preset value, and then end.

[0054] Based on the same inventive concept, the present application also provides a DPF regeneration device, such as Figure 3 As shown, the device comprises: An acquisition module, used to determine the total amount of diesel remaining on the inner wall of the cylinder after entering the DPF regeneration phase, wherein the total amount of diesel remaining on the inner wall of the cylinder is obtained by accumulating the amount of diesel remaining on the inner wall of the cylinder during each previous far post injection process; A dilution degree determination module, used to determine the dilution degree of the engine oil in the oil pan of the vehicle based on the total amount of diesel remaining on the inner wall of the current cylinder; A regeneration module is used to reduce the amount of diesel sprayed during the current far post injection process from a reference value to a preset value when the dilution degree of the engine oil exceeds a first dilution degree, so that the DPF is regenerated according to a preset temperature, wherein the amount of diesel sprayed during the far post injection process corresponds to the regeneration temperature of the DPF, and the reference value represents the amount of diesel sprayed during the far post injection process when the DPF is regenerated according to the reference temperature.

[0055] In a possible implementation, the acquisition module is used to: Determine the amount of fuel consumed during any one of the remote post-injection processes based on the collected exhaust flow rate of the engine, the intake temperature of the DPF, and the intake temperature of the oxidation catalyst during any one of the remote post-injection processes; Based on the amount of diesel injected during any one of the long after injection processes and the difference between the amount of fuel consumed, the amount of diesel remaining on the inner wall of the cylinder during any one of the long after injection processes is obtained.

[0056] In a possible implementation, the acquisition module is used to: By formula The amount of diesel consumed is obtained, where Q represents the amount of oil consumed, L represents the exhaust flow rate of the engine, ΔT is the difference between the intake temperature of the DPF and the intake temperature of the oxidation catalyst, f represents the conversion efficiency of the oxidation catalyst, a represents the specific heat capacity of diesel, and b represents the heat generated by the combustion of diesel per unit mass.

[0057] In one possible implementation, the regeneration module is used to: When it is determined that the dilution degree of the engine oil exceeds a second dilution degree, DPF regeneration is performed by adjusting the throttle opening, and the second dilution degree is greater than the first dilution degree.

[0058] In one possible implementation, the regeneration module is used to: When it is determined that the dilution degree of the engine oil does not exceed the first dilution degree, the amount of diesel injected in the current far post injection process is set as the reference value, so that the DPF is regenerated according to the reference temperature.

[0059] In a possible implementation, the acquisition module is used to: When it is detected that the engine oil has been changed, the locally recorded total amount of diesel remaining on the inner wall of the cylinder is changed to a preset value.

[0060] Based on the same inventive concept, the present application embodiment also provides an electronic device, such as Figure 4 As shown, the electronic device includes: Processor, memory, communication interface and bus. The processor, memory and communication interface are interconnected via a bus.

[0061] The processor is used to read and execute instructions in the memory, so that the at least one processor can execute a DPF regeneration method provided by the above embodiment.

[0062] The memory is used to store various instructions and programs of the DPF regeneration method provided in the above embodiment.

[0063] The communication interface is used for data exchange between each sensor and the electronic control unit.

[0064] The bus can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 4 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0065] The processor may be a central processing unit (CPU), a network processor (NP), a graphic processing unit (GPU), or any combination of CPU, NP, and GPU. It may also be a hardware chip. The above-mentioned hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The above-mentioned PLD may be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL), or any combination thereof.

[0066] The memory may include a readable medium in the form of a volatile memory, such as a random access memory (RAM) and / or a cache memory, and may further include a read-only memory (ROM). The memory may also include a program / utility having a set (at least one) of program modules, such program modules including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include the implementation of a network environment.

[0067] Based on the same inventive concept, the embodiment of the present application also provides a vehicle, such as Figure 5 As shown, the vehicle comprises: Electronic control units, such as Figure 4The electronic device shown acquires data uploaded by each sensor and executes a DPF regeneration method provided by an embodiment of the present application according to the data; A first temperature sensor collects the DPF intake air temperature and uploads the collected temperature data to the electronic control unit; The second temperature sensor collects the DOC intake air temperature and uploads the collected temperature data to the electronic control unit; The flow sensor collects the exhaust flow of the engine and uploads the collected flow data to the electronic control unit.

[0068] The embodiment of the present application also provides a computer program product, including a computer program, which implements any of the above-mentioned DPF regeneration methods when the computer program is executed by a processor. For example, the method in the present application can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instruction is loaded and executed on a computer, the process or function of the present application is executed in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device, a core network device or other programmable device.

[0069] Optionally, a computer-readable storage medium can be used as an implementation method of the above-mentioned computer program product, that is, an embodiment of the present application also provides a computer-readable storage medium, which includes a computer program, and when the computer program is executed by a processor, it implements any one of the above-mentioned DPF regeneration methods.

[0070] For example, a computer program or instruction may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, a computer program or instruction may be transmitted from one website, computer, server or data center to another website, computer, server or data center by wired or wireless means. A computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. Available media may be magnetic media, such as a floppy disk, a hard disk, or a magnetic tape; may also be optical media, such as a digital video disk; or may be semiconductor media, such as a solid-state drive. The computer-readable storage medium may be a volatile or non-volatile storage medium, or may include both volatile and non-volatile types of storage media.

[0071] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0072] These computer programs can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce a product including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0073] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0074] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0075] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A DPF regeneration method, characterized in that: The method comprises: After entering the DPF regeneration phase, the total amount of diesel remaining on the cylinder inner wall is obtained, wherein the total amount of diesel remaining on the cylinder inner wall is obtained by accumulating the amount of diesel remaining on the cylinder inner wall during each previous far post injection process; Determining the dilution degree of the engine oil in the oil pan of the vehicle based on the total amount of diesel remaining on the inner wall of the cylinder at present, wherein the dilution degree represents the amount of diesel mixed in the engine oil; If the dilution degree of the engine oil exceeds the first dilution degree, the amount of diesel sprayed during the current far post injection process is reduced from a reference value to a preset value so that the DPF is regenerated according to a preset temperature, wherein the amount of diesel sprayed during the far post injection process corresponds to the regeneration temperature of the DPF, and the reference value represents the amount of diesel sprayed during the far post injection process when the DPF is regenerated according to the reference temperature.

2. The method according to claim 1, characterized in that The amount of diesel remaining on the inner wall of the cylinder during any remote post-injection process is determined by the following method: Determine the amount of fuel consumed during any one of the remote post-injection processes based on the collected exhaust flow rate of the engine, the intake temperature of the DPF, and the intake temperature of the oxidation catalyst during any one of the remote post-injection processes; Based on the amount of diesel injected during any one of the long after injection processes and the difference between the amount of fuel consumed, the amount of diesel remaining on the inner wall of the cylinder during any one of the long after injection processes is obtained.

3. The method according to claim 2, characterized in that The amount of oil consumed during any one remote back injection process satisfies the following formula: ， Among them, Q represents the amount of fuel consumed, L represents the exhaust flow rate of the engine, ΔT represents the difference between the intake temperature of the DPF and the intake temperature of the oxidation catalyst, f represents the conversion efficiency of the oxidation catalyst, a represents the specific heat capacity of diesel, and b represents the heat generated by the combustion of diesel per unit mass.

4. The method according to claim 1, characterized in that: The method further comprises: If the dilution degree of the engine oil exceeds a second dilution degree, DPF regeneration is performed by adjusting the throttle opening, and the second dilution degree is greater than the first dilution degree.

5. The method according to claim 1, characterized in that The method further comprises: If the dilution degree of the engine oil does not exceed the first dilution degree, the amount of diesel injected during the current far post injection process is set as the reference value, so that the DPF is regenerated according to the reference temperature.

6. The method according to claim 1, characterized in that Before obtaining the total amount of diesel remaining on the inner wall of the current cylinder, the method further includes: If it is detected that the engine oil has been replaced, the locally recorded total amount of diesel remaining on the inner wall of the cylinder is replaced with a preset value.

7. An electronic device, characterized in that: The electronic device comprises: At least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor so that the at least one processor executes a method as claimed in any one of claims 1 to 6.

8. A vehicle, characterized in that: The vehicle comprises the electronic device as claimed in claim 7.

9. A computer storage medium, characterized in that: The computer storage medium stores a computer program, and the computer program is used to make a computer execute any one of the methods according to claims 1-6.

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

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