A method and device for DPF overload processing

Abstract

The application provides a DPF overload processing method and device, and relates to the technical field of vehicles. In the method, a first pressure difference value is obtained, wherein the first pressure difference value is an average value of pressure difference values of a DPF under the last n idle conditions of an engine; if the DPF is overloaded, the engine is controlled to enter a thermal management mode; a second pressure difference value of the DPF and a carbon loading amount of the DPF after the engine enters the thermal management mode are obtained; and it is judged whether the DPF satisfies a first preset condition, wherein the first preset condition is that the second pressure difference value is less than a sum of a DPF overload pressure difference limit value and a first deviation value, and the carbon loading amount is less than a DPF overload carbon loading limit value, the first deviation value is a deviation value of the first pressure difference value and a standard idle pressure difference value; if the first preset condition is not satisfied, the engine remains in the thermal management mode; and if the first preset condition is satisfied, the engine is controlled to enter a regeneration mode. In this way, excessive carbon in the DPF can be prevented from being combusted at the same time, and the safety of DPF overload processing is improved.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a DPF overload handling method and apparatus. Background Technology

[0002] The current China VI emission standard introduces limits for particulate matter (PN) and particulate matter (PM). All China VI and non-road stage IV diesel engines are equipped with a Diesel Particulate Filter (DPF) in their aftertreatment system. The DPF is used to capture particulate matter in the exhaust gas. After prolonged engine operation, the particulate matter captured in the DPF accumulates continuously. Excessive carbon particles inside the DPF can lead to poor ventilation, causing poor exhaust performance and severely affecting engine performance. In severe cases of DPF blockage, the DPF carrier can even detach from the aftertreatment system. In current technology, when there is excessive carbon buildup inside the DPF, the engine directly activates the regeneration mode to remove all the carbon deposits. However, because the excessive carbon inside the DPF burns at extremely high temperatures, it can cause the DPF carrier to melt. Therefore, the safety of DPF overload treatment is relatively low.

[0003] In conclusion, improving the safety of DPF overload handling is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, this application provides a DPF overload handling method and apparatus, which aims to improve the safety of DPF overload handling.

[0005] Firstly, this application provides a DPF overload handling method, including:

[0006] Obtain the first differential pressure value, which is the average value of the DPF differential pressure value of the engine under the most recent n idling conditions, where n is a positive integer greater than or equal to 2;

[0007] If the DPF is overloaded, the engine is controlled to enter the thermal management mode, which accelerates the passive regeneration of the DPF and reduces the carbon load of the DPF.

[0008] After the engine enters the thermal management mode, the second differential pressure value of the DPF and the carbon loading of the DPF are obtained;

[0009] Determine whether the DPF meets the first preset condition. The first preset condition is that the second pressure difference value is less than the sum of the DPF overload pressure difference limit and the first deviation value, and the carbon load is less than the DPF overload carbon load limit. The first deviation value is the deviation between the first pressure difference value and the standard idle speed pressure difference value.

[0010] If the first preset condition is not met, the engine remains in thermal management mode;

[0011] If the first preset condition is met, the engine is controlled to enter regeneration mode.

[0012] Optionally, before controlling the engine to enter thermal management mode if the DPF is overloaded, the method further includes:

[0013] Obtain the third differential pressure value of the DPF when the engine is in steady-state operating condition;

[0014] If the third differential pressure value is greater than or equal to the sum of the DPF overload differential pressure limit and the first deviation value, then the DPF is determined to be overloaded.

[0015] Optionally, before obtaining the third differential pressure value of the DPF when the engine is in steady-state operating condition, the method further includes:

[0016] Determine if the DPF differential pressure sensor is faulty;

[0017] If the DPF differential pressure sensor fails, report the DPF differential pressure sensor failure.

[0018] If the DPF differential pressure sensor is not faulty, then the step of obtaining the third differential pressure value of the DPF when the engine is in steady-state operation is performed.

[0019] Optionally, determining whether the DPF differential pressure sensor is faulty includes:

[0020] Obtain the fourth differential pressure value of the DPF after the engine is powered on and before starting;

[0021] Determine whether the deviation between the fourth differential pressure value and the parking standard differential pressure value is less than the first deviation limit;

[0022] If so, then the DPF differential pressure sensor is not faulty;

[0023] If not, then the DPF differential pressure sensor is faulty.

[0024] Optionally, determining whether the DPF differential pressure sensor is faulty includes:

[0025] Calculate the fitting slope of the pressure difference value of the DPF under the most recent n idling conditions of the engine, where n is a positive integer greater than or equal to 2;

[0026] Determine whether the DPF meets the second preset condition, wherein the second preset condition is that the first deviation value is less than the second deviation limit and the fitting slope is less than the slope limit;

[0027] If so, then the DPF differential pressure sensor is not faulty;

[0028] If not, the DPF differential pressure sensor is faulty.

[0029] Secondly, this application provides a DPF overload handling device, comprising:

[0030] The first acquisition module is used to acquire a first differential pressure value, which is the average value of the DPF differential pressure value of the engine under the most recent n idling conditions, where n is a positive integer greater than or equal to 2.

[0031] The first control module is used to control the engine to enter a thermal management mode if the DPF is overloaded. The thermal management mode accelerates the passive regeneration of the DPF and reduces the carbon load of the DPF.

[0032] The second acquisition module is used to acquire the second differential pressure value of the DPF and the carbon loading of the DPF after the engine enters the thermal management mode.

[0033] The first judgment module is used to determine whether the DPF meets the first preset condition. The first preset condition is that the second pressure difference value is less than the sum of the DPF overload pressure difference limit and the first deviation value, and the carbon load is less than the DPF overload carbon load limit. The first deviation value is the deviation between the first pressure difference value and the standard idle speed pressure difference value.

[0034] A holding module is used to maintain the engine in thermal management mode if the first preset condition is not met.

[0035] The regeneration module is used to control the engine to enter the regeneration mode if the first preset condition is met.

[0036] Optionally, the device further includes:

[0037] The third acquisition module is used to acquire the third differential pressure value of the DPF when the engine is in steady-state operating condition;

[0038] The determination module is used to determine that the DPF is overloaded if the third differential pressure value is greater than or equal to the sum of the DPF overload differential pressure limit and the first deviation value.

[0039] Optionally, the device further includes:

[0040] The second judgment module is used to determine whether the DPF differential pressure sensor is faulty.

[0041] The error reporting module is used to report a fault in the DPF differential pressure sensor if the DPF differential pressure sensor fails.

[0042] An execution module is configured to, if the DPF differential pressure sensor is not faulty, execute the step of obtaining the third differential pressure value of the DPF when the engine is in steady-state operating condition.

[0043] Optionally, the second determination module includes:

[0044] The acquisition unit is used to acquire the fourth differential pressure value of the DPF before the engine starts after being powered on;

[0045] The first judgment unit is used to determine whether the deviation between the fourth differential pressure value and the parking standard differential pressure value is less than the first deviation limit; if yes, the DPF differential pressure sensor is not faulty; if no, the DPF differential pressure sensor is faulty.

[0046] Optionally, determining whether the DPF differential pressure sensor is faulty includes:

[0047] The calculation unit is used to calculate the fitting slope of the pressure difference value of the DPF under the most recent n idling conditions of the engine, where n is a positive integer greater than or equal to 2;

[0048] The second judgment unit is used to determine whether the DPF meets the second preset condition, wherein the second preset condition is that the first deviation value is less than the second deviation limit and the fitting slope is less than the slope limit; if yes, the DPF differential pressure sensor is not faulty; if no, the DPF differential pressure sensor is faulty.

[0049] Thirdly, embodiments of this application provide a computer device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, it implements the DPF overload processing method as described in any one of the first aspects of embodiments of this application.

[0050] Fourthly, embodiments of this application provide a computer-readable storage medium storing instructions that, when executed on a terminal device, cause the terminal device to perform the DPF overload processing method as described in any one of the first aspects of embodiments of this application.

[0051] This application provides a DPF overload handling method. When executing the method, a first differential pressure value is first acquired, where the first differential pressure value is the average of the DPF differential pressure values ​​under the engine's most recent n idling conditions. If the DPF is overloaded, the engine is controlled to enter thermal management mode. Then, a second differential pressure value and the carbon load of the DPF are acquired after the engine enters thermal management mode. It is then determined whether the DPF meets a first preset condition, where the first preset condition is that the second differential pressure value is less than the sum of the DPF overload differential pressure limit and a first deviation value, and the carbon load is less than the DPF overload carbon load limit. The first deviation value is the deviation between the first differential pressure value and the standard idling differential pressure value. If the condition is not met, the engine remains in thermal management mode; if it is met, the engine is controlled to enter regeneration mode. This avoids excessive simultaneous combustion of carbon within the DPF, improving the safety of DPF overload handling. Attached Figure Description

[0052] To more clearly illustrate the technical solutions in this embodiment or the prior art, the drawings used in the description of the embodiment or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0053] Figure 1 A flowchart illustrating a DPF overload handling method provided in this application embodiment;

[0054] Figure 2 A flowchart illustrating another DPF overload handling method provided in this application embodiment;

[0055] Figure 3 This is a schematic diagram of the structure of a DPF overload handling device provided in an embodiment of this application;

[0056] Figure 4 This is a schematic diagram of the structure of a computer device provided in an embodiment of this application. Detailed Implementation

[0057] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. This application provides a DPF overload handling method and apparatus, which relates to the field of vehicle technology. The above are merely examples and do not limit the application field of the method and apparatus provided in this application.

[0058] The current China VI emission standard introduces limits for particulate matter (PN) and particulate matter (PM). All China VI and non-road stage IV diesel engines are equipped with a Diesel Particulate Filter (DPF) in their aftertreatment system. The DPF is used to capture particulate matter in the exhaust gas. After prolonged engine operation, the particulate matter captured in the DPF accumulates continuously. Excessive carbon particles inside the DPF can lead to poor ventilation, causing poor exhaust performance and severely affecting engine performance. In severe cases of DPF blockage, the DPF carrier can even detach from the aftertreatment system. In current technology, when there is excessive carbon buildup inside the DPF, the engine directly activates the regeneration mode to remove all the carbon deposits. However, because the excessive carbon inside the DPF burns at extremely high temperatures, it can cause the DPF carrier to melt. Therefore, the safety of DPF overload treatment is relatively low.

[0059] The inventors, through research, proposed the technical solution of this application. First, a first pressure difference value is obtained, which is the average pressure difference value of the DPF under the engine's most recent n idling conditions. If the DPF is overloaded, the engine is controlled to enter thermal management mode. Then, a second pressure difference value of the DPF and the carbon load of the DPF are obtained after the engine enters thermal management mode. It is then determined whether the DPF meets a first preset condition, where the second pressure difference value is less than the sum of the DPF overload pressure difference limit and a first deviation value, and the carbon load is less than the DPF overload carbon load limit. The first deviation value is the deviation between the first pressure difference value and the standard idling pressure difference value. If the condition is not met, the engine remains in thermal management mode; if it is met, the engine is controlled to enter regeneration mode. This avoids excessive simultaneous combustion of carbon within the DPF, improving the safety of DPF overload handling.

[0060] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all of them. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present application. It should be noted that, for ease of description, only the parts related to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of the present application can be combined with each other.

[0061] See Figure 1 , Figure 1 A flowchart of a DPF overload handling method provided in this application embodiment includes:

[0062] S101: Obtain the first differential pressure value.

[0063] Obtain the average pressure difference of the DPF under the most recent n idling conditions, where n is a positive integer greater than or equal to 2, and the specific value of n depends on the specific situation, for example, n=5. Record the average pressure difference of the DPF under the most recent n idling conditions as the first pressure difference value.

[0064] S102: Controls the engine to enter thermal management mode.

[0065] When the DPF is overloaded, the engine is controlled to enter the thermal management mode. The thermal management mode raises the internal temperature of the DPF, generally not exceeding 500°C. The thermal management mode can accelerate the passive regeneration of the DPF, reduce the carbon load of the DPF, and prevent the DPF from becoming clogged due to excessive carbon load, thus preventing the DPF from coming off.

[0066] S103: Obtain the second differential pressure value of the DPF and the carbon load of the DPF after the engine enters thermal management mode.

[0067] After the engine enters thermal management mode, the pressure difference value of the DPF is obtained and recorded as the second pressure difference value.

[0068] S104: Determine whether the DPF meets the first preset condition.

[0069] Determine whether the DPF meets the first preset condition, wherein the first preset condition includes: the second pressure difference value is less than the sum of the DPF overload pressure difference limit and the first deviation value, and the DPF carbon load is less than the DPF overload carbon load limit. The first deviation value is the deviation between the first pressure difference value and the standard idle speed pressure difference value. The deviation value of the standard idle speed pressure difference value, the DPF overload pressure difference limit, and the DPF overload carbon load limit are all preset values, and the specific values ​​depend on the specific situation.

[0070] If the DPF meets the first preset condition, then proceed to step S105;

[0071] If the DPF does not meet the first preset condition, then proceed to step S102.

[0072] S105: Controls the engine to enter regeneration mode.

[0073] If the DPF meets the first preset condition, it means that if DPF regeneration is performed, there will be no intense high temperature generated by the simultaneous combustion of excessive carbon inside the DPF, thus ensuring the safety of DPF regeneration.

[0074] This application provides a DPF overload handling method. When executing the method, a first differential pressure value is first obtained, where the first differential pressure value is the average of the DPF differential pressure values ​​under the engine's most recent n idling conditions. If the DPF is overloaded, the engine is controlled to enter thermal management mode. Then, a second differential pressure value and the carbon load of the DPF are obtained after the engine enters thermal management mode. It is then determined whether the DPF meets a first preset condition, where the second differential pressure value is less than the sum of the DPF overload differential pressure limit and a first deviation value, and the carbon load is less than the DPF overload carbon load limit. The first deviation value is the deviation between the first differential pressure value and the standard idling differential pressure value. If the condition is not met, the engine remains in thermal management mode; if it is met, the engine is controlled to enter regeneration mode. This avoids excessive simultaneous combustion of carbon within the DPF, improving the safety of DPF overload handling.

[0075] See Figure 2 The figure is a flowchart of another DPF overload handling method provided in an embodiment of this application, including:

[0076] The implementation method of step S201 is the same as that of step S101, and will not be described again here.

[0077] S202: Determine if the DPF differential pressure sensor is faulty.

[0078] In one specific implementation, the method for determining whether the DPF differential pressure sensor is faulty includes: acquiring the DPF differential pressure value before engine start-up after power-on, denoted as the fourth differential pressure value; determining whether the deviation between the fourth differential pressure value and the standard differential pressure value at rest is less than a first deviation limit, wherein both the standard differential pressure value at rest and the first deviation limit are preset values, and their specific values ​​depend on the specific circumstances. If yes, the DPF differential pressure sensor is not faulty; otherwise, the DPF differential pressure sensor is faulty.

[0079] In another embodiment, determining whether the DPF differential pressure sensor is faulty includes: calculating the fitting slope of the DPF differential pressure value under the engine's most recent n idling conditions, where n is a positive integer greater than or equal to 2; determining whether the DPF meets a second preset condition, where the second preset condition is that a first deviation value is less than a second deviation limit, and the fitting slope is less than a slope limit, where the second deviation limit and the slope limit are preset values, the specific values ​​of which depend on the specific circumstances. If the condition is met, the DPF differential pressure sensor is not faulty; if the condition is not met, the DPF differential pressure sensor is faulty.

[0080] In another embodiment, the methods for determining whether the DPF differential pressure sensor is faulty in the above two embodiments can be implemented in combination.

[0081] If the DPF differential pressure sensor fails, proceed to step S203;

[0082] If the DPF differential pressure sensor is not faulty, proceed to step S204.

[0083] S203: Reported DPF differential pressure sensor malfunction.

[0084] Due to a DPF differential pressure sensor malfunction, a DPF differential pressure sensor malfunction report is issued, and DPF overload diagnosis will no longer be performed.

[0085] S204: Obtain the third differential pressure value of the DPF when the engine is in steady-state operation.

[0086] If the DPF differential pressure sensor is not faulty, it is necessary to diagnose the DPF overload and obtain the third differential pressure value of the DPF when the engine is in steady-state operating conditions. Here, steady-state operating conditions refer to the engine's operating conditions under constant speed, constant load, and stable temperature and pressure.

[0087] S205: Determine whether the third differential pressure value is greater than or equal to the sum of the DPF overload differential pressure limit and the first deviation value.

[0088] The DPF overload is diagnosed by determining whether the third differential pressure value is greater than or equal to the sum of the DPF overload differential pressure limit and the first deviation value.

[0089] If so, the DPF is overloaded, and step S207 is executed;

[0090] If not, then the DPF is not overloaded, and step S206 is executed.

[0091] S206: Control the engine to enter normal mode.

[0092] The DPF is not overloaded, the engine is running normally, and no action is required.

[0093] The implementation method of step S207 is the same as that of step S102, the implementation method of step S208 is the same as that of step S103, the implementation method of step S209 is the same as that of step S104, and the implementation method of step S210 is the same as that of step S105. They will not be described again here.

[0094] The above are some specific implementations of the DPF overload handling method provided in the embodiments of this application. Based on this, this application also provides a corresponding device. The device provided in the embodiments of this application will be described below from the perspective of functional modularity.

[0095] See Figure 3 , Figure 3 This is a schematic diagram of a DPF overload handling device provided in an embodiment of this application. The DPF overload handling device 400 includes:

[0096] The first acquisition module 410 is used to acquire a first pressure difference value, which is the average value of the pressure difference value of the DPF under the most recent n idling conditions of the engine, where n is a positive integer greater than or equal to 2.

[0097] The first control module 420 is used to control the engine to enter a thermal management mode if the DPF is overloaded. The thermal management mode accelerates the passive regeneration of the DPF and reduces the carbon load of the DPF.

[0098] The second acquisition module 430 is used to acquire the second differential pressure value of the DPF and the carbon loading of the DPF after the engine enters the thermal management mode.

[0099] The first judgment module 440 is used to judge whether the DPF meets the first preset condition. The first preset condition is that the second pressure difference value is less than the sum of the DPF overload pressure difference limit and the first deviation value, and the carbon load is less than the DPF overload carbon load limit. The first deviation value is the deviation between the first pressure difference value and the standard idle speed pressure difference value.

[0100] The module 450 is configured to maintain the engine in thermal management mode if the first preset condition is not met.

[0101] The regeneration module 460 is used to control the engine to enter the regeneration mode if the first preset condition is met.

[0102] Optionally, the device 400 further includes:

[0103] The third acquisition module is used to acquire the third differential pressure value of the DPF when the engine is in steady-state operating condition;

[0104] The determination module is used to determine that the DPF is overloaded if the third differential pressure value is greater than or equal to the sum of the DPF overload differential pressure limit and the first deviation value.

[0105] Optionally, the device 400 further includes:

[0106] The second judgment module is used to determine whether the DPF differential pressure sensor is faulty.

[0107] The error reporting module is used to report a fault in the DPF differential pressure sensor if the DPF differential pressure sensor fails.

[0108] An execution module is configured to, if the DPF differential pressure sensor is not faulty, execute the step of obtaining the third differential pressure value of the DPF when the engine is in steady-state operating condition.

[0109] Optionally, the second determination module includes:

[0110] The acquisition unit is used to acquire the fourth differential pressure value of the DPF before the engine starts after being powered on;

[0111] The first judgment unit is used to determine whether the deviation between the fourth differential pressure value and the parking standard differential pressure value is less than the first deviation limit; if yes, the DPF differential pressure sensor is not faulty; if no, the DPF differential pressure sensor is faulty.

[0112] Optionally, determining whether the DPF differential pressure sensor is faulty includes:

[0113] The calculation unit is used to calculate the fitting slope of the pressure difference value of the DPF under the most recent n idling conditions of the engine, where n is a positive integer greater than or equal to 2;

[0114] The second judgment unit is used to determine whether the DPF meets the second preset condition, wherein the second preset condition is that the first deviation value is less than the second deviation limit and the fitting slope is less than the slope limit; if yes, the DPF differential pressure sensor is not faulty; if no, the DPF differential pressure sensor is faulty.

[0115] This application also provides corresponding devices and computer storage media for implementing the solutions provided in this application.

[0116] The device includes a memory and a processor. The memory stores instructions or code, and the processor executes the instructions or code to cause the device to perform the method described in any embodiment of this application.

[0117] The computer storage medium stores code, and when the code is run, the device running the code implements the method described in any embodiment of this application.

[0118] like Figure 4 As shown, the computer device 01 is represented in the form of a general-purpose computing device. The components of the computer device 01 may include, but are not limited to: one or more processors or processing units 03, system memory 08, and bus 04 connecting different system components (including system memory 08 and processing unit 03).

[0119] Bus 04 represents one or more of several bus architectures, including memory buses or memory controllers, peripheral buses, graphics acceleration ports, processors, or local buses using any of the various bus architectures. Examples of these architectures include, but are not limited to, the Industry Standard Architecture (ISA) bus, the Micro Channel Architecture (MAC) bus, the Enhanced ISA bus, the Video Electronics Standards Association (VESA) local bus, and the Peripheral Component Interconnect (PCI) bus.

[0120] Computer device 01 typically includes a variety of computer system readable media. These media can be any available media that can be accessed by computer device 01, including volatile and non-volatile media, removable and non-removable media.

[0121] System memory 08 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) 09 and / or cache memory 10. Computer device 01 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, storage system 11 may be used to read and write non-removable, non-volatile magnetic media (…). Figure 4 Not shown; usually referred to as a "hard drive"). Although Figure 4 Not shown, a disk drive for reading and writing to a removable non-volatile disk (e.g., a "floppy disk") and an optical disk drive for reading and writing to a removable non-volatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to bus 04 via one or more data media interfaces. Memory 08 may include at least one program product having a set (e.g., at least one) of program modules configured to perform the functions of the embodiments of the present invention.

[0122] A program / utility 12 having a set (at least one) of program modules 13 may be stored in, for example, memory 08. Such program modules 13 include, but are not limited to, an operating system, one or more application programs, other program modules, and program data. Each or some combination of these examples may include an implementation of a network environment. Program modules 13 typically perform the functions and / or methods described in the embodiments of the present invention.

[0123] Computer device 01 can also communicate with one or more external devices 02 (e.g., keyboard, pointing device, display 07, etc.), and with one or more devices that enable a user to interact with the computer device 01, and / or with any device that enables the computer device 01 to communicate with one or more other computing devices (e.g., network card, modem, etc.). This communication can be performed through input / output (I / O) interface 06. Furthermore, computer device 01 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public networks, such as the Internet) through network adapter 05. Figure 4 As shown, network adapter 05 communicates with other modules of computer device 01 via bus 04. It should be understood that, although... Figure 4As not shown in the diagram, it can be used in conjunction with computer device 01 with other hardware and / or software modules, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0124] The processor unit 03 executes various functional applications and data processing by running programs stored in the system memory 08, such as implementing a DPF overload processing method provided in the embodiments of this application.

[0125] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0126] As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that all or part of the steps in the methods of the above embodiments can be implemented by means of software plus a general-purpose hardware platform. Based on this understanding, the technical solution of this application can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as a read-only memory (ROM) / RAM, magnetic disk, optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, a server, or a network communication device such as a router) to execute the methods described in various embodiments or some parts of the embodiments of this application.

[0127] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on its differences from other embodiments. In particular, the apparatus embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0128] The above description is merely an exemplary implementation of this application and is not intended to limit the scope of protection of this application.

Claims

1. A DPF overload handling method, characterized in that, include: Obtain the first differential pressure value, which is the average value of the DPF differential pressure value of the engine under the most recent n idling conditions, where n is a positive integer greater than or equal to 2; If the DPF is overloaded, the engine is controlled to enter the thermal management mode, which accelerates the passive regeneration of the DPF and reduces the carbon load of the DPF. After the engine enters the thermal management mode, the second differential pressure value of the DPF and the carbon loading of the DPF are obtained; Determine whether the DPF meets the first preset condition. The first preset condition is that the second pressure difference value is less than the sum of the DPF overload pressure difference limit and the first deviation value, and the carbon load is less than the DPF overload carbon load limit. The first deviation value is the deviation between the first pressure difference value and the standard idle speed pressure difference value. If the first preset condition is not met, the engine remains in thermal management mode; If the first preset condition is met, the engine is controlled to enter regeneration mode; If the DPF is overloaded, before controlling the engine to enter thermal management mode, the method further includes: Obtain the third differential pressure value of the DPF when the engine is in steady-state operating condition; If the third differential pressure value is greater than or equal to the sum of the DPF overload differential pressure limit and the first deviation value, then the DPF is determined to be overloaded. Before obtaining the third differential pressure value of the DPF when the engine is in steady-state operating condition, the method further includes: Determine if the DPF differential pressure sensor is faulty; If the DPF differential pressure sensor fails, report the DPF differential pressure sensor failure. If the DPF differential pressure sensor is not faulty, then the step of obtaining the third differential pressure value of the DPF when the engine is in steady-state operation is performed.

2. The method according to claim 1, characterized in that, The method for determining whether the DPF differential pressure sensor is faulty includes: Obtain the fourth differential pressure value of the DPF after the engine is powered on and before starting; Determine whether the deviation between the fourth differential pressure value and the parking standard differential pressure value is less than the first deviation limit; If so, then the DPF differential pressure sensor is not faulty; If not, then the DPF differential pressure sensor is faulty.

3. The method according to claim 1, characterized in that, The method for determining whether the DPF differential pressure sensor is faulty includes: Calculate the fitting slope of the pressure difference value of the DPF under the most recent n idling conditions of the engine, where n is a positive integer greater than or equal to 2; Determine whether the DPF meets the second preset condition, wherein the second preset condition is that the first deviation value is less than the second deviation limit and the fitting slope is less than the slope limit; If so, then the DPF differential pressure sensor is not faulty; If not, then the DPF differential pressure sensor is faulty.

4. A DPF overload handling device, characterized in that, The processing device uses the processing method as described in any one of claims 1-3 to process DPF overload, and the device includes: The first acquisition module is used to acquire a first differential pressure value, which is the average value of the DPF differential pressure value of the engine under the most recent n idling conditions, where n is a positive integer greater than or equal to 2. The first control module is used to control the engine to enter a thermal management mode if the DPF is overloaded. The thermal management mode accelerates the passive regeneration of the DPF and reduces the carbon load of the DPF. The second acquisition module is used to acquire the second differential pressure value of the DPF and the carbon loading of the DPF after the engine enters the thermal management mode. The first judgment module is used to determine whether the DPF meets the first preset condition. The first preset condition is that the second pressure difference value is less than the sum of the DPF overload pressure difference limit and the first deviation value, and the carbon load is less than the DPF overload carbon load limit. The first deviation value is the deviation between the first pressure difference value and the standard idle speed pressure difference value. A holding module is used to maintain the engine in thermal management mode if the first preset condition is not met. A regeneration module is used to control the engine to enter regeneration mode if the first preset condition is met. The third acquisition module is used to acquire the third differential pressure value of the DPF when the engine is in steady-state operating condition; The determination module is used to determine that the DPF is overloaded if the third differential pressure value is greater than or equal to the sum of the DPF overload differential pressure limit and the first deviation value. The second judgment module is used to determine whether the DPF differential pressure sensor is faulty. The error reporting module is used to report a fault in the DPF differential pressure sensor if the DPF differential pressure sensor fails. An execution module is configured to, if the DPF differential pressure sensor is not faulty, execute the step of obtaining the third differential pressure value of the DPF when the engine is in steady-state operating condition.

5. A computer device, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the DPF overload handling method as described in any one of claims 1-3.

6. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores instructions that, when executed on a terminal device, cause the terminal device to perform the DPF overload handling method as described in any one of claims 1-3.

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