A DPF pressure difference measurement value correction method, device, vehicle and storage medium

Abstract

The present invention provides a DPF pressure differential measurement value correction method, device, vehicle, and storage medium, belonging to the field of vehicle control technology. The method includes: obtaining a first DPF pressure differential measurement value after the vehicle is powered off, and judging whether a first correction condition is satisfied based on the first DPF pressure differential measurement value; when the first correction condition is satisfied, determining a correction coefficient based on the first DPF pressure differential measurement value; when the vehicle is powered on next time, obtaining a second DPF pressure differential measurement value before the engine is started, and judging whether a second correction condition is satisfied based on the second DPF pressure differential measurement value; when the second correction condition is satisfied, determining a pressure differential correction value based on the correction coefficient and the first DPF pressure differential measurement value, and correcting the real-time DPF pressure differential measurement value after the vehicle is powered on based on the pressure differential correction value. The present invention improves the environmental applicability and correction accuracy of the DPF pressure differential measurement value correction method.

Description

Technical Field

[0001] The present invention relates to the field of vehicle control technology, and in particular to a DPF pressure difference measurement value correction method, device, vehicle and storage medium. Background Art

[0002] With the development of vehicle technology, in order to reduce the emission of toxic and harmful gases in exhaust gas, vehicles are equipped with after-treatment systems. The diesel particulate filter (DPF) in the after-treatment box of the after-treatment system reduces the particulate matter in the exhaust gas. In order to determine whether there is a fault in the after-treatment system, a differential pressure sensor is usually installed in the after-treatment box to measure the pressure difference between the upstream and downstream of the after-treatment box. Subsequent fault diagnosis is performed based on the pressure difference measurement value. However, since the differential pressure sensor is installed in the exhaust gas environment, prolonged exposure to high-temperature exhaust gas will affect the output of the sensor characteristics, and after long-term use, aging or water vapor intrusion may occur, which may cause the zero point drift of the differential pressure sensor, resulting in measurement deviation of the differential pressure sensor.

[0003] To avoid measurement bias in the differential pressure sensor, patent CN114414143A discloses a DPF differential pressure sensor self-learning method. This DPF differential pressure sensor self-learning method first determines whether the current operating conditions meet the pre-engine start self-learning conditions (the engine must be at room temperature). If so, the sensor self-learns after the vehicle is powered on and before the engine is started. The sum of all valid differential pressure values ​​measured during the self-learning process is divided by the valid measurement time to obtain a unit differential pressure mean. A weighted average differential pressure is then calculated using the weighted average method based on the N unit mean differential pressures obtained during the current and N-1 previous self-learning processes and the N valid measurement times. If the weighted average differential pressure is negative, the current differential pressure measured by the differential pressure sensor at zero engine speed is increased by the absolute value of the weighted average differential pressure. If the weighted average differential pressure is positive, the current differential pressure measured by the differential pressure sensor at zero engine speed is decreased by the weighted average differential pressure, so that the differential pressure sensor reads zero at zero engine speed. However, the above patent has the following technical problems: (1) The self-learning function of the differential pressure sensor before the engine starts in the patent has limitations on the application environment and cannot perform self-learning in an environment below the set temperature. It cannot solve the sensor signal offset correction caused by factors such as ice or condensed water in the sensor cavity or pipeline when the engine is cold started at low temperatures. (2) The self-learning algorithm in the patent uses the direct addition and subtraction method of the current value and the weighted mean to correct the sensor zero point, resulting in over-correction. (3) The self-learning algorithm in the patent only corrects the sensor zero point when the engine speed is zero, and does not correct the full operating conditions when the engine is running, and does not eliminate the diagnostic error caused by the sensor signal drift when the engine is running. The above technical problems result in poor environmental applicability of the DPF differential pressure measurement value correction method and inaccurate correction.

[0004] Therefore, there is an urgent need to provide a DPF pressure difference measurement value correction method, device, vehicle and storage medium to improve the environmental applicability of the DPF pressure difference measurement value correction method and improve the accuracy of the DPF pressure difference measurement value correction method. Summary of the Invention

[0005] In view of this, it is necessary to provide a DPF pressure difference measurement value correction method, device, vehicle and storage medium to solve the technical problems of poor environmental applicability and inaccurate correction of the DPF pressure difference measurement value correction method in the prior art.

[0006] On the one hand, in order to solve the above technical problems, the present invention provides a DPF pressure difference measurement value correction method, comprising:

[0007] Obtaining a first DPF pressure difference measurement value after the vehicle is powered off, and determining whether a first correction condition is satisfied based on the first DPF pressure difference measurement value;

[0008] determining a correction coefficient based on the first DPF pressure difference measurement value when the first correction condition is met;

[0009] When the vehicle is powered on next time, a second DPF pressure difference measurement value before the engine is started is obtained, and based on the second DPF pressure difference measurement value, whether a second correction condition is satisfied is determined;

[0010] When the second correction condition is met, a pressure difference correction value is determined based on the correction coefficient and the first DPF pressure difference measurement value, and the real-time DPF pressure difference measurement value after the vehicle is powered on is corrected based on the pressure difference correction value.

[0011] In a possible implementation, the first correction condition is that the first DPF differential pressure measurement value is within a first threshold range, and the second correction condition is that the second DPF differential pressure measurement value is within a second threshold range.

[0012] In one possible implementation, the vehicle is powered off when the ignition key is turned off and the engine speed is zero. Then, obtaining the first DPF pressure difference measurement value after the vehicle is powered off includes:

[0013] When the vehicle is powered off for a first predetermined time, a plurality of first initial DPF pressure difference measurement values ​​are collected based on a second predetermined time;

[0014] A first average of the plurality of first initial DPF differential pressure measurements is determined, and the first average is used as the first DPF differential pressure measurement.

[0015] In one possible implementation, determining a correction coefficient based on the first DPF pressure difference measurement value includes:

[0016] Obtaining a pre-calibrated correction model, wherein the correction model is used to characterize a corresponding relationship between a correction coefficient and a DPF pressure difference measurement value;

[0017] The correction coefficient is determined based on the first DPF pressure difference measurement value and the correction model.

[0018] In a possible implementation, when the first DPF differential pressure measurement value is a positive value, the correction coefficient is a negative value; and when the first DPF differential pressure measurement value is a negative value, the correction coefficient is a positive value.

[0019] In a possible implementation, when the vehicle is powered on, no ignition signal is detected, and the engine speed is less than a threshold speed, obtaining the second DPF pressure difference measurement value before the engine is started includes:

[0020] When the vehicle power-on time reaches a threshold time, collecting multiple second initial DPF pressure difference measurement values ​​based on a third preset time;

[0021] A second average of the plurality of second initial DPF differential pressure measurements is determined, and the second average is used as the second DPF differential pressure measurement.

[0022] In one possible implementation, the correcting the real-time DPF pressure difference measurement value after the vehicle is powered on based on the pressure difference correction value includes:

[0023] Obtain multiple real-time DPF pressure difference measurement values ​​at multiple sampling moments during the vehicle's driving process after it is powered on;

[0024] The plurality of real-time DPF differential pressure measurements are corrected based on the differential pressure correction value.

[0025] On the other hand, the present invention also provides a DPF pressure difference measurement value correction device, comprising:

[0026] a first correction condition judgment unit, configured to obtain a first DPF pressure difference measurement value after the vehicle is powered off, and judge whether a first correction condition is satisfied based on the first DPF pressure difference measurement value;

[0027] a correction coefficient determining unit, configured to determine a correction coefficient based on the first DPF pressure difference measurement value when the first correction condition is satisfied;

[0028] a second correction condition judgment unit, configured to obtain a second DPF pressure difference measurement value before the engine is started when the vehicle is powered on next time, and judge whether a second correction condition is satisfied based on the second DPF pressure difference measurement value;

[0029] The DPF pressure difference measurement value correction unit is used to determine a pressure difference correction value based on the correction coefficient and the first DPF pressure difference measurement value when the second correction condition is met, and to correct the real-time DPF pressure difference measurement value after the vehicle is powered on based on the pressure difference correction value.

[0030] In another aspect, the present invention further provides a vehicle, comprising a memory and a processor, wherein:

[0031] The memory is used to store programs;

[0032] The processor is coupled to the memory and is configured to execute the program stored in the memory to implement the steps of the DPF pressure difference measurement value correction method described in any one of the possible implementations above.

[0033] On the other hand, the present invention also provides a computer-readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps in the DPF pressure difference measurement value correction method described in any one of the possible implementation methods mentioned above are implemented.

[0034] The beneficial effects of the present invention are as follows: the DPF pressure differential measurement value correction method provided by the present invention can determine whether the DPF pressure differential measurement value correction can be performed by setting a judgment based on the first DPF pressure differential measurement value and the second DPF pressure differential measurement value, without considering the temperature state of the engine, solving the technical problem in the prior art that the pressure differential measurement value correction cannot be performed when the engine is cold started at low temperature, and improving the environmental applicability of the DPF pressure differential measurement value correction method.

[0035] Furthermore, after determining the pressure difference correction value, the present invention corrects the real-time pressure difference measurement value after the entire vehicle is powered on based on the pressure difference correction value, that is, the vehicle state where the engine speed is not zero can be corrected. Compared with the method in the prior art of only correcting the sensor zero point when the engine is static, the correction of all working conditions when the engine is running is achieved, thereby eliminating the error caused by the zero point drift of the sensor signal when the engine is running, and improving the accuracy of the DPF pressure difference measurement value correction.

[0036] Furthermore, compared with the prior art method of directly adding and subtracting the current measurement value and the weighted mean to make the pressure differential sensor reading zero, the present invention determines the pressure differential correction value based on the correction coefficient and the first PDF pressure differential measurement value. The pressure differential measurement value is not corrected with the goal of the pressure differential sensor reading being zero. The pressure differential measurement value is corrected in a step-by-step manner when the vehicle is powered on and off, which is more regular and more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 A schematic flow chart of an embodiment of a method for correcting a DPF pressure difference measurement value provided by the present invention;

[0039] Figure 2 This is a flow chart of an embodiment of obtaining a first DPF pressure difference measurement value after the vehicle is powered off in step S101 of the present invention;

[0040] Figure 3 For the present invention Figure 1 A flowchart of an embodiment of determining a correction coefficient based on a first DPF pressure difference measurement value in step S102;

[0041] Figure 4 For the present invention Figure 1A flow chart of an embodiment of obtaining a second DPF pressure difference measurement value before engine startup in step S103;

[0042] Figure 5 For the present invention Figure 1 A flow chart of an embodiment of correcting the real-time DPF pressure difference measurement value after the vehicle is powered on based on the pressure difference correction value in step S104;

[0043] Figure 6 A schematic structural diagram of an embodiment of a DPF pressure difference measurement value correction device provided by the present invention;

[0044] Figure 7 This is a schematic structural diagram of an embodiment of a vehicle provided by the present invention. DETAILED DESCRIPTION

[0045] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0046] It should be understood that the schematic drawings are not drawn to scale. The flowcharts used in the present invention illustrate operations implemented according to some embodiments of the present invention. It should be understood that the operations of the flowcharts can be implemented out of sequence, and steps that have no logical contextual relationship can be reversed in order or implemented simultaneously. In addition, those skilled in the art, guided by the content of the present invention, can add one or more other operations to the flowcharts or remove one or more operations from the flowcharts. Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and / or processor systems and / or microcontroller systems.

[0047] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute a separate or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0048] The present invention provides a DPF pressure difference measurement value correction method, device, vehicle and storage medium, which are described below respectively.

[0049] Figure 1 A schematic flow chart of an embodiment of a method for correcting a DPF pressure difference measurement value provided by the present invention is shown in FIG. Figure 1 As shown, the DPF pressure difference measurement value correction method includes:

[0050] S101, obtaining a first DPF pressure difference measurement value after the vehicle is powered off, and determining whether a first correction condition is satisfied based on the first DPF pressure difference measurement value;

[0051] S102: When a first correction condition is met, determining a correction coefficient based on the first DPF pressure difference measurement value;

[0052] S103: When the vehicle is powered on next time, obtain a second DPF pressure difference measurement value before the engine is started, and determine whether a second correction condition is met based on the second DPF pressure difference measurement value;

[0053] S104: When the second correction condition is met, determine a pressure difference correction value based on the correction coefficient and the first DPF pressure difference measurement value, and correct the real-time DPF pressure difference measurement value after the vehicle is powered on based on the pressure difference correction value.

[0054] It should be noted that when the first correction condition is not met, the correction coefficient is not calculated. When the second correction condition is not met, it means that the DPF differential pressure measurement value collected by the DPF sensor is inaccurate. In the subsequent vehicle power-on process, the DPF differential pressure measurement value is not collected based on the DPF sensor. Instead, the DPF differential pressure measurement value is indirectly obtained through a preset calculation formula based on other vehicle status data, such as speed, temperature, etc.

[0055] The correction coefficient in step S102 may be a percentage. In this case, the pressure differential correction value in step S104 is determined by multiplying the correction coefficient by the first DPF pressure differential measurement value as the pressure differential correction value. The correction coefficient in step S102 may also be an offset. In this case, the pressure differential correction value in step S104 is determined by summing the correction coefficient and the first DPF pressure differential measurement value as the pressure differential correction value.

[0056] Compared with the prior art, the DPF pressure differential measurement value correction method provided in the embodiment of the present invention can determine whether the DPF pressure differential measurement value correction can be performed by setting a judgment based on the first DPF pressure differential measurement value and the second DPF pressure differential measurement value, without considering the temperature state of the engine. This solves the technical problem in the prior art that the pressure differential measurement value correction cannot be performed when the engine is cold started at low temperature, and improves the environmental applicability of the DPF pressure differential measurement value correction method.

[0057] Furthermore, after determining the pressure differential correction value, the embodiment of the present invention corrects the real-time pressure differential measurement value after the vehicle is powered on based on the pressure differential correction value, that is, the vehicle state where the engine speed is not zero can be corrected. Compared with the method in the prior art of only correcting the sensor zero point when the engine is static, correction is achieved for all working conditions when the engine is running, thereby eliminating the error caused by the zero point drift of the sensor signal when the engine is running, and improving the accuracy of the DPF pressure differential measurement value correction.

[0058] Furthermore, compared with the prior art method of directly adding and subtracting the current measurement value and the weighted mean to make the pressure differential sensor reading zero, the present invention determines the pressure differential correction value based on the correction coefficient and the first PDF pressure differential measurement value. The pressure differential measurement value is not corrected with the goal of the pressure differential sensor reading being zero. The pressure differential measurement value is corrected in a step-by-step manner when the vehicle is powered on and off, which is more regular and more accurate.

[0059] In a specific embodiment of the present invention, the first DPF differential pressure measurement value is within a first threshold range, and the second correction condition is: the second DPF differential pressure measurement value is within a second threshold range.

[0060] The embodiment of the present invention sets the first correction condition and the second correction condition to be that the DPF differential pressure measurement value is within a certain range, thereby avoiding the technical problem of being unable to effectively correct when the DPF differential pressure measurement value drifts too much, and further improving the accuracy of the correction.

[0061] Specifically, the first threshold range is: -2kPa ~ +2kPa, and the second threshold range is: -1.5kPa ~ +1.5kPa.

[0062] It should be understood that the first threshold range and the second threshold range can be set or adjusted according to actual application scenarios, and will not be described in detail here.

[0063] In order to improve the accuracy of the first DPF pressure difference measurement value, in some embodiments of the present invention, the vehicle is powered off when the ignition key is returned to the OFF position and the engine speed is zero; Figure 2 As shown, the step S101 of obtaining the first DPF pressure difference measurement value after the vehicle is powered off includes:

[0064] S201: When the vehicle power-off duration reaches a first preset duration, collecting a plurality of first initial DPF pressure difference measurement values ​​based on a second preset duration;

[0065] S202: Determine a first average value of a plurality of first initial DPF differential pressure measurement values, and use the first average value as a first DPF differential pressure measurement value.

[0066] Among them, the first preset time length is 5S, and the second preset time length is 10S.

[0067] By providing a method for collecting multiple first initial DPF differential pressure measurements after the vehicle has been powered off for a first predetermined duration, the present embodiment avoids the technical problem of inaccurate first initial DPF differential pressure measurements resulting from unstable vehicle conditions immediately after powering off, thereby improving the accuracy of the multiple first initial DPF differential pressure measurements. Furthermore, the present embodiment uses the first average of the multiple first initial DPF differential pressure measurements as the first DPF differential pressure measurement, eliminating the uncertainty and inaccuracy of a single first initial DPF differential pressure measurement and further improving the accuracy of the first DPF differential pressure measurement.

[0068] In some embodiments of the present invention, Figure 3 As shown, determining the correction coefficient based on the first DPF pressure difference measurement value in step S102 includes:

[0069] S301: Obtain a pre-calibrated correction model, where the correction model is used to characterize the corresponding relationship between the correction coefficient and the DPF differential pressure measurement value;

[0070] S302 : Determine a correction coefficient based on the first DPF pressure difference measurement value and the correction model.

[0071] Among them, the correction model can be constructed by calibration through historical test data.

[0072] Since the purpose of correcting the DPF differential pressure measurement value is to correct the DPF differential pressure measurement value to zero as much as possible, in some embodiments of the present invention, when the first DPF differential pressure measurement value is positive, the correction coefficient is negative, and when the first DPF differential pressure measurement value is negative, the correction coefficient is positive.

[0073] For example, when the measured pressure difference of the first DPF is 0.8 kPa, the correction coefficient is -10%.

[0074] In some embodiments of the present invention, the vehicle is powered on when: no ignition signal is detected and the engine speed is less than a threshold speed.

[0075] Specifically, the threshold speed is 50 rpm. It should be understood that the threshold speed can be adjusted according to actual application scenarios.

[0076] In a specific embodiment of the present invention, Figure 4 As shown, the step S103 of obtaining the second DPF pressure difference measurement value before the engine is started includes:

[0077] S401: When the vehicle power-on duration reaches a threshold time, collecting a plurality of second initial DPF pressure difference measurement values ​​based on a third preset duration;

[0078] S402: Determine a second average value of a plurality of second initial DPF differential pressure measurement values, and use the second average value as a second DPF differential pressure measurement value.

[0079] Among them, the threshold time is 3S, and the third preset time length is 2S.

[0080] Similarly, by setting the vehicle power-on duration to reach a threshold, the embodiments of the present invention collect multiple second initial DPF differential pressure measurements. This avoids the technical issue of inaccurate second initial DPF differential pressure measurements resulting from unstable vehicle conditions immediately after power-on, thereby improving the accuracy of these multiple second initial DPF differential pressure measurements. Furthermore, the embodiments of the present invention use the second average of these multiple second initial DPF differential pressure measurements as the second DPF differential pressure measurement, eliminating the uncertainty and inaccuracy of a single second initial DPF differential pressure measurement and further improving the accuracy of the second DPF differential pressure measurement.

[0081] In some embodiments of the present invention, Figure 5 As shown, step S104 corrects the real-time DPF pressure difference measurement value after the vehicle is powered on based on the pressure difference correction value, including:

[0082] S501, obtaining multiple real-time DPF pressure difference measurement values ​​at multiple sampling moments during the vehicle's driving process after the vehicle is powered on;

[0083] S502 : Correct a plurality of real-time DPF pressure difference measurement values ​​based on the pressure difference correction value.

[0084] Specifically, step S501 is: obtaining a pressure difference data curve graph during the vehicle's powered-on driving process, and determining a plurality of real-time DPF pressure difference measurement values ​​based on the pressure difference data curve graph.

[0085] The embodiment of the present invention corrects multiple real-time DPF pressure difference measurements based on the pressure difference correction value, thereby realizing pressure difference measurement value correction in all working conditions during vehicle driving, and making the correction of the pressure difference measurement value more accurate.

[0086] In order to better implement the DPF pressure difference measurement value correction method in the embodiment of the present invention, based on the DPF pressure difference measurement value correction method, the embodiment of the present invention also provides a DPF pressure difference measurement value correction device, such as Figure 6 As shown, the DPF pressure difference measurement value correction device 600 includes:

[0087] A first correction condition determination unit 601 is configured to obtain a first DPF pressure difference measurement value after the vehicle is powered off, and determine whether a first correction condition is satisfied based on the first DPF pressure difference measurement value;

[0088] a correction coefficient determining unit 602 for determining a correction coefficient based on the first DPF pressure difference measurement value when a first correction condition is satisfied;

[0089] The second correction condition judgment unit 603 is configured to obtain a second DPF pressure difference measurement value before the engine is started when the vehicle is powered on next time, and to judge whether the second correction condition is satisfied based on the second DPF pressure difference measurement value;

[0090] The DPF pressure difference measurement value correction unit 604 is used to determine a pressure difference correction value based on the correction coefficient and the first DPF pressure difference measurement value when the second correction condition is met, and to correct the real-time DPF pressure difference measurement value after the vehicle is powered on based on the pressure difference correction value.

[0091] The DPF pressure difference measurement value correction device 600 provided in the above embodiment can implement the technical solution described in the above DPF pressure difference measurement value correction method embodiment. The specific implementation principles of the above modules or units can refer to the corresponding contents in the above DPF pressure difference measurement value correction method embodiment, which will not be repeated here.

[0092] like Figure 7 As shown, the present invention also provides a vehicle 700. The vehicle 700 includes a processor 701, a memory 702 and a display 703. Figure 7 Only some of the components of vehicle 700 are shown, but it should be understood that implementing all of the shown components is not a requirement, and more or fewer components may alternatively be implemented.

[0093] In some embodiments, the processor 701 may be a central processing unit (CPU), a microprocessor, or other data processing chip, configured to execute program codes or process data stored in the memory 702, such as the DPF pressure difference measurement value correction method of the present invention.

[0094] In some embodiments of the present invention, processor 701 may be a single server or a server group. The server group may be centralized or distributed. In some embodiments, processor 701 may be local or remote. In some embodiments, processor 701 may be implemented on a cloud platform. In one embodiment, the cloud platform may include a private cloud, a public cloud, a hybrid cloud, a community cloud, a distributed cloud, an internal cloud, multiple clouds, or any combination thereof.

[0095] In some embodiments, the memory 702 may be an internal storage unit of the vehicle 700 , such as a hard drive or memory of the vehicle 700 .

[0096] Furthermore, the memory 702 may include both an internal storage unit of the vehicle 700 and an external storage device. The memory 702 is used to store application software installed in the vehicle 700 and various data.

[0097] In some embodiments, display 703 can be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, or an OLED (Organic Light-Emitting Diode) touchscreen. Display 703 is used to display information about vehicle 700 and to present a visual user interface. Components 701-703 of vehicle 700 communicate with each other via a system bus.

[0098] In some embodiments of the present invention, when the processor 701 executes the DPF pressure difference measurement value correction program in the memory 702, the following steps may be implemented:

[0099] Obtaining a first DPF pressure difference measurement value after the vehicle is powered off, and determining whether a first correction condition is satisfied based on the first DPF pressure difference measurement value;

[0100] determining a correction coefficient based on the first DPF pressure difference measurement value when a first correction condition is satisfied;

[0101] When the vehicle is powered on next time, a second DPF pressure difference measurement value before the engine is started is obtained, and based on the second DPF pressure difference measurement value, whether the second correction condition is satisfied is determined;

[0102] When the second correction condition is met, a pressure difference correction value is determined based on the correction coefficient and the first DPF pressure difference measurement value, and the real-time DPF pressure difference measurement value after the vehicle is powered on is corrected based on the pressure difference correction value.

[0103] It should be understood that, when the processor 701 executes the DPF pressure difference measurement value correction program in the memory 702 , in addition to the above functions, it can also implement other functions. For details, please refer to the description of the corresponding method embodiment above.

[0104] It should be noted that the vehicle can be a hybrid vehicle or a non-hybrid vehicle, that is, a pure electric vehicle.

[0105] Accordingly, an embodiment of the present invention also provides a computer-readable storage medium, which is used to store computer-readable programs or instructions. When the program or instructions are executed by a processor, the steps or functions in the DPF pressure difference measurement value correction method provided in the above-mentioned method embodiments can be implemented.

[0106] It should be noted that the computer-readable medium shown in the embodiments of the present invention may be a computer-readable signal medium or a computer-readable storage medium, or any combination thereof. The computer-readable storage medium may, for example, be an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or component, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to, an electrical connection having one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0107] Those skilled in the art will appreciate that all or part of the process flow of the above-described method embodiment can be implemented by instructing related hardware (such as a processor, controller, etc.) through a computer program, and the computer program can be stored in a computer-readable storage medium. The computer-readable storage medium may be a magnetic disk, an optical disk, a read-only memory, or a random access memory.

[0108] The above is a detailed introduction to a DPF pressure difference measurement value correction method, device, vehicle and storage medium provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the ideas of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A DPF pressure difference measurement value correction method, characterized in that: include: Obtaining a first DPF pressure difference measurement value after the vehicle is powered off, and determining whether a first correction condition is satisfied based on the first DPF pressure difference measurement value; determining a correction coefficient based on the first DPF pressure difference measurement value when the first correction condition is met; When the vehicle is powered on next time, a second DPF pressure difference measurement value before the engine is started is obtained, and based on the second DPF pressure difference measurement value, whether a second correction condition is satisfied is determined; When the second correction condition is met, determining a pressure difference correction value based on the correction coefficient and the first DPF pressure difference measurement value, and correcting the real-time DPF pressure difference measurement value after the vehicle is powered on based on the pressure difference correction value; The first correction condition is that the first DPF differential pressure measurement value is within a first threshold range, and the second correction condition is that the second DPF differential pressure measurement value is within a second threshold range; The vehicle is powered off when the ignition key is turned OFF and the engine speed is zero. The step of obtaining the first DPF pressure difference measurement value after the vehicle is powered off includes: When the vehicle is powered off for a first predetermined time, a plurality of first initial DPF pressure difference measurement values ​​are collected based on a second predetermined time; determining a first average of the plurality of first initial DPF differential pressure measurements, and using the first average as the first DPF differential pressure measurement; The determining of the correction coefficient based on the first DPF pressure difference measurement value includes: Obtaining a pre-calibrated correction model, wherein the correction model is used to characterize a corresponding relationship between a correction coefficient and a DPF pressure difference measurement value; determining the correction coefficient based on the first DPF pressure difference measurement value and the correction model; When the first DPF differential pressure measurement value is a positive value, the correction coefficient is a negative value; when the first DPF differential pressure measurement value is a negative value, the correction coefficient is a positive value; When the vehicle is powered on and no ignition signal is detected and the engine speed is less than a threshold speed, the second DPF pressure difference measurement value before the engine is started is obtained, including: When the vehicle power-on time reaches a threshold time, collecting multiple second initial DPF pressure difference measurement values ​​based on a third preset time; determining a second average of the plurality of second initial DPF differential pressure measurements, and using the second average as the second DPF differential pressure measurement; The method of correcting the real-time DPF pressure difference measurement value after the vehicle is powered on based on the pressure difference correction value includes: Obtain multiple real-time DPF pressure difference measurement values ​​at multiple sampling moments during the vehicle's driving process after it is powered on; The plurality of real-time DPF differential pressure measurements are corrected based on the differential pressure correction value.

2. A DPF pressure difference measurement value correction device, characterized in that: The method for correcting the DPF differential pressure measurement value according to claim 1, wherein the device comprises: a first correction condition judgment unit, configured to obtain a first DPF pressure difference measurement value after the vehicle is powered off, and judge whether a first correction condition is satisfied based on the first DPF pressure difference measurement value; a correction coefficient determining unit, configured to determine a correction coefficient based on the first DPF pressure difference measurement value when the first correction condition is satisfied; a second correction condition judgment unit, configured to obtain a second DPF pressure difference measurement value before the engine is started when the vehicle is powered on next time, and to judge whether a second correction condition is satisfied based on the second DPF pressure difference measurement value; The DPF pressure difference measurement value correction unit is used to determine a pressure difference correction value based on the correction coefficient and the first DPF pressure difference measurement value when the second correction condition is met, and to correct the real-time DPF pressure difference measurement value after the vehicle is powered on based on the pressure difference correction value.

3. A vehicle, characterized in that: comprising a memory and a processor, wherein, The memory is used to store programs; The processor is coupled to the memory and is configured to execute the program stored in the memory to implement the steps of the DPF pressure difference measurement value correction method according to claim 1.

4. A computer-readable storage medium, characterized in that The readable storage medium stores a program or instruction, and when the program or instruction is executed by the processor, the steps in the DPF pressure difference measurement value correction method described in claim 1 are implemented.

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