DPF low efficiency fault diagnosis method, device and operating machinery

Abstract

The present invention provides a DPF low efficiency fault diagnosis method, device and operating machinery, including: obtaining the cumulative specific pressure difference and cumulative effective work of the DPF in the target engine, the instantaneous specific pressure difference at any moment is the ratio between the pressure difference of the DPF at any moment and the output power of the target engine; when it is determined that the cumulative effective work reaches the first threshold, obtaining the comparison result of the cumulative specific pressure difference and the effective specific pressure difference threshold to update the number of abnormalities of the DPF; the number of abnormalities is used to determine the low efficiency fault diagnosis result of the DPF. The present invention combines the cumulative effective work and the DPF cumulative specific pressure difference to determine the DPF filtration efficiency, improve the recognition rate of DPF normal parts and DPF faulty parts, reduce the difficulty of DPF low efficiency fault diagnosis, improve the accuracy of DPF low efficiency fault diagnosis, and at the same time improve the robustness of fault diagnosis, and reduce the occurrence of DPF low efficiency fault false alarms during actual vehicle use.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to a DPF low efficiency fault diagnosis method, device and operating machinery. Background Art

[0002] Particulate matter (PM) is one of the main pollutants in diesel engine exhaust emissions, and PM in automobile exhaust has become an important criterion for measuring automobile quality. In order to meet emission requirements, diesel vehicles currently use particulate filters (DPF) to reduce PM in exhaust emissions.

[0003] When the DPF captures a certain amount of PM, DPF regeneration measures will be taken to treat the PM. During the regeneration process, the DPF is likely to break due to excessive temperature, which will lead to a decrease in DPF filtration efficiency. Therefore, in order to ensure the normal operation of the DPF, the DPF needs to be monitored.

[0004] In the existing DPF monitoring method, the pressure difference value collected by the DPF pressure difference sensor is compared with a set pressure difference lower limit value. When the collected pressure difference value is less than the set pressure difference lower limit value, a DPF fault is reported.

[0005] However, the accuracy of the existing DPF differential pressure sensor is about 5hPa, and the deviation between normal and faulty DPF parts in general application conditions is within 10hPa. Therefore, due to the low accuracy of the existing DPF differential pressure sensor, it is not easy to distinguish between normal DPF parts and faulty DPF parts. In the actual use of the vehicle, the engine operating conditions are complex and changeable, which will also greatly reduce the accuracy of DPF filtration efficiency diagnosis decisions, and ultimately lead to false alarms of low DPF efficiency faults, causing the vehicle to limit torque and speed, affecting the driver's driving. Summary of the invention

[0006] The present invention provides a DPF low efficiency fault diagnosis method, device and operating machine, which are used to solve the defect in the prior art that it is difficult to distinguish between DPF normal parts and DPF fault parts, resulting in false alarm of DPF low efficiency fault.

[0007] In a first aspect, the present invention provides a method for diagnosing a DPF low efficiency fault, comprising: obtaining a cumulative specific pressure difference and a cumulative effective work of a DPF in a target engine, wherein the cumulative specific pressure difference is obtained by accumulating an instantaneous specific pressure difference of the DPF, and the instantaneous specific pressure difference at any moment is the ratio between the pressure difference of the DPF at any moment and the output power of the target engine; and determining the cumulative effective work.

[0008] When the first threshold is reached, a comparison result of the cumulative specific pressure difference and the effective specific pressure difference threshold is obtained to update the number of abnormalities of the DPF; the number of abnormalities is used to determine the low efficiency fault diagnosis result of the DPF.

[0009] According to a DPF low efficiency fault diagnosis method provided by the present invention, the effective specific pressure difference threshold includes a second threshold and a third threshold, and the second threshold is less than the third threshold; the comparison result of the cumulative specific pressure difference and the effective specific pressure difference threshold is obtained to update the number of abnormalities of the DPF, including: if the cumulative specific pressure difference is less than the second threshold, the number of abnormalities of the DPF is increased by one; if the cumulative specific pressure difference is greater than the third threshold, the number of abnormalities of the DPF is reduced by one.

[0010] According to a DPF low efficiency fault diagnosis method provided by the present invention, after obtaining the comparison result of the cumulative specific pressure difference and the effective specific pressure difference threshold value to update the number of abnormalities of the DPF, it also includes: iteratively executing the step of obtaining the cumulative specific pressure difference and the cumulative effective work of the DPF in the target engine to obtain the comparison result of the cumulative specific pressure difference and the effective specific pressure difference threshold value to update the number of abnormalities of the DPF until the current diagnosis cycle ends; obtaining the cumulative number of abnormalities at the end of the current diagnosis cycle; the cumulative number of abnormalities is used to determine the low efficiency fault diagnosis result of the DPF.

[0011] According to a DPF low efficiency fault diagnosis method provided by the present invention, after obtaining the cumulative number of abnormalities at the end of the current diagnosis cycle, it also includes: if it is determined that the cumulative number of abnormalities is greater than or equal to a fourth threshold, outputting a fault signal.

[0012] According to a DPF low efficiency fault diagnosis method provided by the present invention, after obtaining the cumulative number of abnormalities at the end of the current diagnosis cycle, it also includes: if the cumulative number of abnormalities in at least two consecutive diagnosis cycles is greater than or equal to a fourth threshold, a fault signal is output.

[0013] According to a DPF low efficiency fault diagnosis method provided by the present invention, after obtaining the cumulative number of abnormalities at the end of the current diagnosis cycle, it also includes: if the cumulative number of abnormalities is less than or equal to a fifth threshold, outputting a fault clearing signal; the fifth threshold is less than the fourth threshold.

[0014] According to a DPF low efficiency fault diagnosis method provided by the present invention, after outputting the fault signal or outputting the fault clearing signal, it also includes: setting the accumulated abnormal number to zero.

[0015] According to a DPF low efficiency fault diagnosis method provided by the present invention, before obtaining the comparison result of the cumulative specific pressure difference and the effective specific pressure difference threshold to update the number of abnormalities of the DPF, it also includes: using the carbon load of the DPF, the average temperature of the DPF and the exhaust flow rate to correct the effective specific pressure difference threshold.

[0016] According to a DPF low efficiency fault diagnosis method provided by the present invention, before obtaining the cumulative specific pressure difference and cumulative effective work of the DPF in the target engine, it also includes: obtaining engine operating parameters; the engine operating parameters include engine operating speed, engine torque, and at least one of the instantaneous pressure difference of the DPF, exhaust flow, carbon loading of the DPF, and average temperature of the DPF; when it is determined that the engine operating parameters meet the diagnosis enabling conditions, obtaining the cumulative specific pressure difference and the cumulative effective work of the DPF.

[0017] In a second aspect, the present invention also provides a DPF low efficiency fault diagnosis device, comprising: a data acquisition unit, used to obtain the cumulative specific pressure difference and cumulative effective work of the DPF in the target engine, the cumulative specific pressure difference is obtained by accumulating the instantaneous pressure difference of the DPF, and the instantaneous specific pressure difference at any moment is the ratio between the pressure difference of the DPF at any moment and the output power of the target engine; a fault diagnosis unit, used to obtain the comparison result of the cumulative specific pressure difference and the effective specific pressure difference threshold value when it is determined that the cumulative effective work reaches a first threshold value, so as to update the abnormal number of the DPF; the abnormal number is used to determine the low efficiency fault diagnosis result of the DPF.

[0018] In a third aspect, the present invention also provides an engine, comprising an engine body, a controller, a memory, and a program or instruction stored in the memory and executable on the controller, wherein the program or instruction, when executed by the controller, implements the steps of any of the above-mentioned DPF low efficiency fault diagnosis methods.

[0019] In a fourth aspect, the present invention further provides a working machine, comprising a working machine body, in which a DPF efficiency diagnostic processor is provided; and further comprising a memory and a program or instruction stored in the memory and executable on the DPF efficiency diagnostic processor, wherein when the program or instruction is executed by the DPF efficiency diagnostic processor, the steps of any one of the above-mentioned DPF low efficiency fault diagnosis methods are implemented.

[0020] In a fifth aspect, the present invention provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of any of the above-mentioned DPF low efficiency fault diagnosis methods are implemented.

[0021] In a sixth aspect, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the above-mentioned DPF inefficiency fault diagnosis methods.

[0022] The DPF low efficiency fault diagnosis method, device and operating machinery provided by the present invention combine the cumulative effective work and the DPF cumulative specific pressure difference to determine the DPF filtration efficiency, improve the recognition rate of DPF normal parts and DPF faulty parts, reduce the difficulty of DPF low efficiency fault diagnosis, improve the accuracy of DPF low efficiency fault diagnosis, and at the same time improve the robustness of fault diagnosis, thereby reducing the occurrence of DPF low efficiency fault false alarms during actual vehicle use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of a WHTC cycle DPF pressure difference changing with time in the prior art;

[0025] Figure 2 It is one of the flow charts of the DPF low efficiency fault diagnosis method provided by the present invention;

[0026] Figure 3 It is a schematic diagram of a WHTC cycle DPF pressure difference changing with output power in the DPF low efficiency fault diagnosis method provided by the present invention;

[0027] Figure 4 It is a schematic diagram of the variation of the DPF cumulative specific pressure difference with the cumulative effective work in a WHTC cycle in the DPF low efficiency fault diagnosis method provided by the present invention;

[0028] Figure 5 This is the second flow chart of the DPF low efficiency fault diagnosis method provided by the present invention;

[0029] Figure 6 It is a structural schematic diagram of a DPF low efficiency fault diagnosis device provided by the present invention;

[0030] Figure 7 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that, in the description of the embodiments of the present invention, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "include one..." do not exclude the presence of other identical elements in the process, method, article or device including the elements. The orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] The terms "first", "second", etc. in this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of the same type, and the number of objects is not limited. For example, the first object can be one or more.

[0034] In the prior art, the DPF monitoring method is mainly carried out in the following ways:

[0035] (1) Calculate the pressure difference estimation value through the DPF pressure difference sensor and the pressure difference calculation model;

[0036] (2) Calculate the lower limit of the pressure difference based on the exhaust gas flow rate and DPF temperature;

[0037] (3) Calculate the correction coefficient of the lower limit of the pressure difference by the DPF carbon load; finally obtain the corrected lower limit of the pressure difference;

[0038] (4) Compare the estimated pressure difference with the lower limit of the pressure difference, and start timing when the estimated pressure difference is less than the lower limit of the pressure difference;

[0039] (5) When the time reaches the limit, a fault is reported.

[0040] Figure 1 This is a schematic diagram of a WHTC cycle DPF pressure difference changing with time in the prior art, with the horizontal axis being time in seconds (s); the vertical axis being DPF pressure difference in hPa. The WHTC cycle refers to the World Harmonized Transient Cycle (WHTC), which is often used as a general term for engine emission test cycles.

[0041] Combining the above steps (1) to (5) and Figure 1 It can be obtained that in the prior art, when the vehicle is in operation, the DPF differential pressure will change rapidly and drastically between 0-60hPa as time changes. Even if the lower limit of the differential pressure is corrected based on the DPF carbon load, the difference between the DPF normal part and the DPF faulty part is within 10hPa and the low precision of the existing DPF differential pressure sensor will result in the difference between the DPF differential pressure estimate and the lower limit of the differential pressure not being obvious, which in turn makes it difficult to distinguish between the DPF normal part and the DPF faulty part, and it is easy to cause a false alarm of a low DPF efficiency fault.

[0042] In addition, the DPF monitoring method based on time comparison of the differential pressure estimate and the differential pressure lower limit has a higher risk of false alarms of low DPF efficiency failures due to the complex and changeable working conditions in the same period of time during the actual operation of the vehicle and the lack of linear correlation between the differential pressure of the DPF and time.

[0043] Combine the following Figures 2 to 7 , briefly describing the DPF low efficiency fault diagnosis method, device and operating machinery provided by the embodiments of the present invention.

[0044] Figure 2 FIG. 1 is one of the flow charts of the DPF low efficiency fault diagnosis method provided by the present invention, such as Figure 2 As shown, including but not limited to the following steps:

[0045] Step 101: Obtaining the cumulative specific pressure difference and cumulative effective work of the DPF in the target engine, wherein the cumulative specific pressure difference is obtained by accumulating the instantaneous specific pressure difference of the DPF, and the instantaneous specific pressure difference at any moment is the ratio between the pressure difference of the DPF at any moment and the output power of the target engine;

[0046] Specifically, the target engine is the engine of the vehicle to be diagnosed currently.

[0047] Figure 3It is a schematic diagram of a WHTC cycle DPF pressure difference changing with output power in the DPF low efficiency fault diagnosis method provided by the present invention, wherein the abscissa is the output power of the target engine in kilowatts (kw); the ordinate is the DPF pressure difference in hPa.

[0048] Combination Figure 3 As shown, there is a strong positive correlation between the DPF pressure difference and the target engine output power. Therefore, compared with the defect of the weak linear correlation between the DPF pressure difference and time in the prior art, the correlation between the DPF pressure difference and the target engine output power is closer.

[0049] Furthermore, the instantaneous specific pressure difference of DPF refers to the ratio of the DPF pressure difference to the output power of the target engine at the same time. Based on the instantaneous specific pressure difference of DPF in a WHTC cycle, the instantaneous specific pressure difference of DPF is accumulated over time (such as integral calculation) to obtain the DPF cumulative specific pressure difference. In addition, the output power can be calculated from the torque and speed of the target engine, the output work of the target engine can be calculated from the output power, and the cumulative effective work can be calculated by integrating the output work of the engine in a WHTC cycle.

[0050] Step 102: when it is determined that the accumulated effective work reaches a first threshold, obtaining a comparison result between the accumulated specific pressure difference and an effective specific pressure difference threshold, so as to update the number of abnormal times of the DPF;

[0051] Specifically, when the accumulated effective work reaches the first threshold, based on the comparison result of the accumulated specific pressure difference and the effective specific pressure difference threshold, the abnormal number of DPF updates is determined. The first threshold is pre-set according to the practical needs of the specific scenario when the DPF efficiency diagnosis calculation starts. For example, the first threshold can be set to 25kwh.

[0052] Furthermore, the number of DPF abnormalities can be counted in the following way:

[0053] The initial value of the number of DPF abnormalities is 0. If the accumulated pressure difference is greater than the effective pressure difference threshold value within any preset time (which can be a diagnosis cycle), it can be determined that the current DPF efficiency is normal and no abnormality has occurred, and the number of DPF abnormalities remains unchanged or is reduced. Correspondingly, if the accumulated pressure difference is less than the effective pressure difference threshold value within any preset time, it can be determined that the current DPF efficiency is low and an abnormality may have occurred, and the number of DPF abnormalities can be increased.

[0054] Figure 4It is a schematic diagram of the change of the DPF cumulative specific pressure difference with the cumulative effective work in a WHTC cycle in the DPF low efficiency fault diagnosis method provided by the present invention, the abscissa is the cumulative effective work, the unit is kilowatt-hour (kwh); the ordinate is the DPF cumulative specific pressure difference, the unit is kilopascal per kilowatt-hour (kPa / kwh).

[0055] Combination Figure 4 As shown, it can be intuitively known that the cumulative specific pressure difference of the DPF faulty part is much lower than the cumulative specific pressure difference of the DPF normal part.

[0056] Furthermore, combined with Figure 1 and Figure 4 As shown, it can be seen that in the prior art, since the DPF efficiency is diagnosed based on time, the DPF pressure difference varies greatly in the entire WHTC cycle, and when determining the diagnosis interval, the interval that can be set is very small (refer to Figure 1 ). The diagnosis interval is a selected interval during DPF efficiency diagnosis, and the DPF efficiency diagnosis result in the diagnosis interval is used as the DPF efficiency diagnosis result in the WHTC cycle.

[0057] In the DPF efficiency low fault diagnosis method provided by the present invention, based on the change of the cumulative specific pressure difference with the cumulative effective work (see Figure 4 ). Since the cumulative specific pressure difference is very stable in most sections of a WHTC cycle, the change difference is not large. Therefore, when determining the diagnosis interval, the diagnostic interval range that can be set is larger and more reference data can be used, thereby improving the fault tolerance of DPF low efficiency fault diagnosis, reducing the difficulty of DPF low efficiency fault diagnosis, and improving the robustness of low efficiency fault diagnosis.

[0058] Furthermore, compared with the prior art, the pressure difference between the normal DPF part and the DPF faulty part is not obvious, and it is not easy to distinguish the defects of the normal DPF part and the DPF faulty part. In the DPF low efficiency fault diagnosis method provided by the present invention, the difference between the cumulative specific pressure difference of the normal DPF part and the cumulative specific pressure difference of the DPF faulty part is very obvious. Therefore, by comparing the cumulative specific pressure difference with the effective pressure difference threshold, the normal DPF part and the DPF faulty part can be better identified, reducing the difficulty of diagnosing the DPF low efficiency fault; reducing the occurrence of false alarms of the DPF low efficiency fault.

[0059] Step 103: The abnormal number is used to determine the low efficiency fault diagnosis result of the DPF.

[0060] Specifically, the DPF low efficiency fault diagnosis result can be determined by the numerical value of the abnormal number. For example, when the abnormal number is large, it is determined that the target engine DPF is faulty.

[0061] The DPF low efficiency fault diagnosis method provided by the present invention combines the cumulative effective work and the DPF cumulative specific pressure difference to determine the DPF filtration efficiency, improves the recognition rate of DPF normal parts and DPF faulty parts, reduces the difficulty of DPF low efficiency fault diagnosis, improves the accuracy of DPF low efficiency fault diagnosis, and at the same time improves the robustness of fault diagnosis, thereby reducing the occurrence of DPF low efficiency fault false alarms during actual vehicle use.

[0062] Based on the content of the above embodiment, as an optional embodiment, the effective specific pressure difference threshold includes a second threshold and a third threshold, and the second threshold is smaller than the third threshold;

[0063] The obtaining of the comparison result of the cumulative specific pressure difference with the effective specific pressure difference threshold value to update the number of abnormal times of the DPF includes:

[0064] If the accumulated specific pressure difference is less than the second threshold, the number of abnormalities of the DPF is increased by one;

[0065] If the accumulated specific pressure difference is greater than the third threshold, the number of abnormalities of the DPF is reduced by one.

[0066] Specifically, the second threshold and the third threshold can be pre-set according to the practical needs of a specific scenario. The second threshold is less than the third threshold to ensure that the DPF cumulative pressure difference is not less than the second threshold and greater than the third threshold at the same time, thereby preventing the abnormal number of DPF abnormalities from increasing by one and decreasing by one at the same time. In addition, when the DPF cumulative pressure difference is neither less than the second threshold nor greater than the third threshold (i.e., between the second threshold and the third threshold), the DPF abnormal number will not change at this time.

[0067] Therefore, when the DPF cumulative pressure difference does not reach the second threshold, the number of DPF abnormalities increases by one, reflecting that the current DPF has the risk of low efficiency failure; when the DPF efficiency reaches the third threshold, the number of DPF abnormalities decreases by one, reflecting that the current DPF does not have the risk of low efficiency failure temporarily. In other words, the numerical value of the number of DPF abnormalities can further reflect whether the DPF has the risk of low efficiency failure. The higher the value, the greater the risk, and the lower the value, the smaller the risk.

[0068] Further, assuming that the second threshold is 55kPa / kwh and the third threshold is 58kPa / kwh. If the cumulative pressure difference is 63kPa / kwh, the number of DPF abnormalities decreases by one; if the cumulative pressure difference is 57kPa / kwh, the cumulative pressure difference is between the second threshold and the third threshold, and the number of DPF abnormalities does not change; if the cumulative pressure difference is 48kPa / kwh, the number of DPF abnormalities increases by one.

[0069] The DPF low efficiency fault diagnosis method provided by the present invention determines the change of the number of DPF abnormalities by setting the DPF effective specific pressure difference threshold, and can better reflect the risk of DPF low efficiency fault through the magnitude of the number of DPF abnormalities, thereby improving the recognition rate of DPF normal parts and DPF faulty parts.

[0070] Based on the content of the above embodiment, as an optional embodiment, after obtaining the comparison result of the cumulative specific pressure difference and the effective specific pressure difference threshold value to update the number of abnormal times of the DPF, it also includes:

[0071] Iteratively executing the step of obtaining the cumulative specific pressure difference and the cumulative effective work of the DPF in the target engine, until obtaining a comparison result of the cumulative specific pressure difference with an effective specific pressure difference threshold, so as to update the number of abnormalities of the DPF, until the current diagnosis cycle ends;

[0072] Get the cumulative number of exceptions at the end of the current diagnosis cycle;

[0073] The accumulated abnormal number is used to determine the low efficiency fault diagnosis result of the DPF.

[0074] Specifically, the diagnosis cycle is the total diagnosis duration of the DPF efficiency diagnosis, and may be pre-set according to scenario requirements when the DPF efficiency diagnosis starts.

[0075] For example, a diagnosis cycle can be set as iterative execution of the steps of obtaining the cumulative specific pressure difference and the cumulative effective work of the DPF in the target engine, obtaining the comparison result of the cumulative specific pressure difference and the effective specific pressure difference threshold, and updating the abnormal number of the DPF for a total of three WHTC cycles, wherein each WHTC cycle diagnoses the current DPF efficiency once within the diagnosis interval. After the first iteration is completed, the abnormal number is adjusted accordingly or maintained unchanged according to the diagnosis result of the iteration, and the first cumulative abnormal number corresponding to the first iteration is obtained; on the basis of the first cumulative abnormal number, the second iteration is completed, and the first cumulative abnormal number is adjusted accordingly or maintained unchanged according to the diagnosis result of the iteration, and the second cumulative abnormal number is obtained corresponding to the second iteration; finally, on the basis of the second cumulative abnormal number, the third iteration is completed, and the second cumulative abnormal number is adjusted accordingly or maintained unchanged according to the diagnosis result of the iteration, and finally a final cumulative abnormal number result is obtained.

[0076] Finally, based on the result of the cumulative number of abnormalities, the low efficiency fault diagnosis result of the DPF can be determined by the numerical value of the cumulative number of abnormalities.

[0077] The DPF low efficiency fault diagnosis method provided by the present invention completes the DPF efficiency diagnosis by multiple iterations within a diagnosis cycle, and determines whether there is a low efficiency fault risk of the DPF efficiency of the target engine based on the size of the final accumulated abnormality number, thereby improving the fault tolerance of the DPF efficiency diagnosis and avoiding the risk of errors in the diagnosis result caused by data abnormalities in a single DPF efficiency diagnosis.

[0078] Based on the content of the above embodiment, as an optional embodiment, after obtaining the cumulative number of abnormalities at the end of the current diagnosis cycle, it also includes:

[0079] If it is determined that the accumulated number of abnormalities is greater than or equal to a fourth threshold, a fault signal is output.

[0080] Optionally, the above fault signal may be sent to an electronic control system ECU, so that the ECU reports DPF fault information.

[0081] Specifically, the fourth threshold value may be pre-set according to the requirements of a specific scenario. When the cumulative number of abnormalities is greater than or equal to the fourth threshold value, it indicates that the DPF has a low efficiency fault, and a fault signal will be output to the electronic control unit (ECU). The electronic control system ECU may be a vehicle-mounted computer. When the ECU receives the fault signal, the DPF low efficiency fault information may be displayed to the driver through the vehicle-mounted display screen carried by the ECU. For example, a striking red "DPF low efficiency fault" prompt window may appear on the vehicle-mounted screen to remind the driver.

[0082] Assuming that the fourth threshold is 3 and the cumulative number of abnormalities is 4, the current cumulative number of abnormalities is already greater than the fourth threshold, and a fault signal will be output to the ECU. After receiving the fault signal, the ECU will pop up a prompt window on the vehicle display to remind the driver that the vehicle currently being driven has a DPF efficiency low fault.

[0083] The DPF low efficiency fault diagnosis method provided by the present invention is based on outputting a fault signal to the ECU and the ECU reporting the DPF low efficiency fault information, so that the ECU and the driver can both receive the information that the current driving vehicle has a DPF low efficiency fault in the first time, thereby improving the driving safety of the driving vehicle.

[0084] Based on the content of the above embodiment, as an optional embodiment, after obtaining the cumulative number of abnormalities at the end of the current diagnosis cycle, it also includes:

[0085] If the accumulated number of abnormalities in at least two consecutive diagnosis cycles is greater than or equal to a fourth threshold, a fault signal is output.

[0086] Optionally, the above fault signal may be sent to an electronic control system ECU, so that the ECU reports DPF fault information.

[0087] Optionally, the ECU may output DPF fault information to the vehicle display screen to pop up a prompt window to remind the driver that the vehicle currently being driven has a DPF low efficiency fault.

[0088] Specifically, due to the inevitable error risks such as data anomalies in the diagnosis cycle, there may be a risk of false alarm of DPF low efficiency fault. By comparing the cumulative number of anomalies in at least two consecutive diagnosis cycles with the fourth threshold, it is determined whether the current driving vehicle has a DPF low efficiency fault.

[0089] If the accumulated number of abnormalities in at least two consecutive diagnostic cycles is greater than or equal to a fourth threshold, outputting a fault signal to the ECU;

[0090] For example, when the number of consecutive diagnostic cycles is 3, if after the first two diagnostic cycles, the DPF is judged to be a faulty component, but after the third diagnostic cycle, the DPF is judged to be a normal component, no fault signal is output to the ECU, and it is deemed that the current driving vehicle does not have a DPF low efficiency fault.

[0091] It should be noted that, if the number of consecutive diagnosis cycles of the DPF fault diagnosis is greater, the robustness of the DPF low efficiency fault diagnosis is better.

[0092] Therefore, by comparing the cumulative number of abnormalities in at least two consecutive diagnosis cycles with the fourth threshold, the diagnostic accuracy of the DPF low efficiency fault can be further improved, and the occurrence of false alarms of the DPF low efficiency fault can be reduced.

[0093] The DPF low efficiency fault diagnosis method provided by the present invention improves the diagnostic accuracy of the DPF low efficiency fault, reduces the occurrence of DPF low efficiency fault false alarms, and improves the robustness of the DPF low efficiency fault diagnosis by comparing the cumulative abnormal number of at least two consecutive diagnosis cycles with the fourth threshold value.

[0094] Based on the content of the above embodiment, as an optional embodiment, after obtaining the cumulative number of abnormalities at the end of the current diagnosis cycle, it also includes:

[0095] If the accumulated number of abnormalities is less than or equal to a fifth threshold, outputting a fault clearing signal to the ECU;

[0096] The fifth threshold is smaller than the fourth threshold.

[0097] Specifically, the fifth threshold value can be pre-set according to the requirements of specific scenarios. The fifth threshold value is less than the fourth threshold value to ensure the logical rationality of the output fault signal and the fault clearing signal, because the size of the cumulative number of abnormalities reflects the risk of DPF low efficiency failure in the current vehicle. The larger the cumulative number of abnormalities, the higher the risk of DPF low efficiency failure; the smaller the cumulative number of abnormalities, the lower the risk of DPF low efficiency failure.

[0098] It should be noted that if the cumulative number of abnormal times is neither higher than the fourth threshold nor lower than the fifth threshold, no fault signal or fault clearing signal will be output in this diagnosis cycle, and the ECU will not receive the fault signal or fault clearing signal.

[0099] Assuming that the fifth threshold is 0 and the current cumulative number of abnormalities is -1, a fault clearing signal is output to the ECU. When the ECU receives the fault clearing signal, it can be known that the DPF efficiency of the current driving vehicle is low and the fault risk is low.

[0100] The DPF low efficiency fault diagnosis method provided by the present invention improves the accuracy of DPF efficiency diagnosis by comparing the accumulated abnormal number with the fifth threshold value, and better identifies DPF normal parts and DPF faulty parts.

[0101] Based on the content of the above embodiment, as an optional embodiment, if it is determined that the ECU has reported the DPF fault information in a diagnosis cycle before the current diagnosis cycle, the fault clearing signal is used to trigger the ECU to clear the DPF fault information.

[0102] Specifically, the diagnosis result of the previous diagnosis cycle of the current diagnosis cycle is an output fault signal. After the ECU receives the fault signal and reports the DPF low efficiency fault information, if the final result of the current diagnosis cycle is an output fault clearing signal, then the fault clearing signal can be used to trigger the ECU to clear the above-mentioned DPF low efficiency fault information.

[0103] In order to overcome the defect that there is no fault clearing for the possible false alarm of low DPF efficiency fault in the prior art, the low DPF efficiency fault diagnosis method provided by the present invention determines that there is no low efficiency fault in the DPF efficiency of the current target engine through the fault clearing signal of the current diagnosis cycle. Further, if the diagnosis result of the previous diagnosis cycle is to output a fault signal, and the ECU reports the low DPF efficiency fault information after receiving the fault signal, the DPF fault information of the previous diagnosis cycle can be cleared through the fault clearing signal. In other words, the DPF fault information can be effectively cleared through the fault clearing signal, reducing the impact of the false alarm of low DPF efficiency fault on the target engine, and avoiding the torque and speed limit of the driving vehicle.

[0104] The DPF low efficiency fault diagnosis method provided by the present invention can be used to clear the DPF low efficiency fault information of the previous diagnosis cycle by adding a fault clearing signal, thereby further improving the robustness of the DPF low efficiency fault diagnosis and reducing the risk of false alarm of the DPF low efficiency fault.

[0105] Based on the content of the above embodiment, as an optional embodiment, before outputting the fault signal or outputting the fault clearing signal, it also includes: setting the accumulated abnormal number to zero.

[0106] Specifically, each time a fault signal or a fault clearing signal is output, the current accumulated number of abnormalities will be reset to zero to prepare for the next diagnosis.

[0107] Therefore, by setting the cumulative number of abnormalities to zero, it is possible to avoid the situation where the final cumulative number of abnormalities result of the current diagnosis cycle affects the cumulative number of abnormalities result of the next diagnosis cycle, thereby causing errors in the diagnosis result of the next diagnosis cycle.

[0108] The DPF low efficiency fault diagnosis method provided by the present invention ensures that each diagnosis cycle is independent of each other and will not be affected by the result of the previous diagnosis cycle by setting the cumulative number of abnormalities to zero, thereby improving the accuracy of DPF efficiency diagnosis and improving the recognition rate of DPF normal parts and DPF faulty parts.

[0109] Based on the content of the above embodiment, as an optional embodiment, before obtaining the comparison result of the cumulative specific pressure difference and the effective specific pressure difference threshold to update the number of abnormal times of the DPF, it also includes:

[0110] The effective specific pressure difference threshold is corrected using the carbon load of the DPF, the average temperature of the DPF and the exhaust flow rate.

[0111] Specifically, in the actual use of the vehicle, the complex and changeable working environment also has different effects on the DPF efficiency. Therefore, by obtaining the carbon load of the DPF, the average temperature of the DPF, and the exhaust flow correction effective ratio difference threshold of the target engine, it is possible to more accurately distinguish between normal DPF parts and DPF faulty parts, and improve the accuracy of DPF efficiency diagnosis. Among them, the average temperature of the DPF is the average value of the inlet temperature of the DPF and the outlet temperature of the DPF; the exhaust flow refers to the engine exhaust flow, that is, the mass flow of gas inhaled or discharged by the engine per stroke or per cycle.

[0112] For example, the effective ratio difference threshold may be corrected by the exhaust flow rate. When the exhaust flow rate increases, the PM concentration in the vehicle exhaust will increase accordingly. At this time, the effective ratio difference threshold may also increase accordingly based on the change in PM concentration.

[0113] The DPF low efficiency fault diagnosis method provided by the present invention corrects the effective specific pressure difference threshold value through the carbon load of the DPF, the average temperature of the DPF and the exhaust flow rate, thereby improving the accuracy of DPF efficiency diagnosis, improving the recognition rate of DPF normal parts and DPF faulty parts, and reducing the occurrence of DPF low efficiency false alarms.

[0114] Based on the content of the above embodiment, as an optional embodiment, before obtaining the cumulative specific pressure difference and cumulative effective work of the DPF in the target engine, it also includes:

[0115] Acquire engine operating parameters; the engine operating parameters include engine operating speed, engine torque, and at least one of the instantaneous pressure difference of the DPF, exhaust flow, carbon load of the DPF, and average temperature of the DPF.

[0116] When it is determined that the engine operating parameters satisfy the diagnosis enabling condition, the cumulative specific pressure difference and the cumulative effective work of the DPF are obtained.

[0117] Specifically, by obtaining the engine operating parameters and determining that the engine operating parameters meet the diagnosis enabling conditions, the DPF cumulative pressure difference and cumulative effective work are obtained, so as to ensure that the current DPF is in a working state. The obtained DPF cumulative pressure difference and cumulative effective work are real parameters of the DPF in an actual working environment, thereby improving the accuracy of DPF diagnosis.

[0118] The DPF low efficiency fault diagnosis method provided by the present invention further obtains parameters required for DPF efficiency diagnosis after the engine operating parameters meet the diagnosis enabling conditions, thereby improving the data accuracy of DPF efficiency diagnosis and improving the precision of DPF efficiency diagnosis.

[0119] Finally, in order to more clearly illustrate the DPF low efficiency fault diagnosis method provided by the embodiment of the present invention, the following embodiments are provided for illustration:

[0120] Figure 5 FIG. 2 is a flow chart of the DPF low efficiency fault diagnosis method provided by the present invention, as shown in FIG. Figure 5 As shown, including but not limited to the following steps:

[0121] 1) When the acquired engine operating parameters all meet the diagnosis enabling conditions, including DPF instantaneous pressure difference, engine operating speed and engine torque, the pressure difference and work integral calculation are performed to obtain the DPF cumulative specific pressure difference and cumulative effective work;

[0122] 2) The effective specific pressure difference threshold is corrected based on the carbon load of the DPF, the average temperature of the DPF and the exhaust flow rate to obtain the second threshold and the third threshold.

[0123] 3) based on the accumulated effective work and the first threshold, comparing the DPF accumulated specific pressure difference with the second threshold and comparing the DPF accumulated specific pressure difference with the third threshold;

[0124] 4) Based on the comparison result of the DPF cumulative specific pressure difference with the second threshold value and the third threshold value, the DPF abnormality times are updated;

[0125] 5) Based on the fourth threshold and the fifth threshold, output a fault signal or a fault clearing signal to the ECU according to the number of DPF abnormalities;

[0126] 6) After receiving the fault signal or fault clearing signal, the ECU sets the DPF abnormality times to zero.

[0127] Figure 6 Schematic diagram of the structure of the DPF low efficiency fault diagnosis device provided by the present invention. Figure 6 As shown, it mainly includes a data acquisition unit 61 and a fault diagnosis unit 62, wherein:

[0128] A data acquisition unit 61 is used to obtain a cumulative specific pressure difference and a cumulative effective work of a DPF in a target engine, wherein the cumulative specific pressure difference is obtained by accumulating the instantaneous pressure difference of the DPF, and the instantaneous specific pressure difference at any moment is the ratio between the pressure difference of the DPF at any moment and the output power of the target engine;

[0129] a fault diagnosis unit 62, configured to obtain a comparison result between the cumulative specific pressure difference and an effective specific pressure difference threshold value to update the number of abnormalities of the DPF when it is determined that the cumulative effective work reaches a first threshold value;

[0130] The number of abnormalities is used to determine a low efficiency fault diagnosis result of the DPF.

[0131] It should be noted that the DPF low efficiency fault diagnosis device provided in the embodiment of the present invention can execute the DPF low efficiency fault diagnosis method described in any of the above embodiments during specific operation, which will not be elaborated in this embodiment.

[0132] The DPF low efficiency fault diagnosis device provided by the present invention combines the cumulative effective work and the DPF cumulative specific pressure difference to determine the DPF filtration efficiency, improves the recognition rate of DPF normal parts and DPF faulty parts, reduces the difficulty of DPF low efficiency fault diagnosis, improves the accuracy of DPF low efficiency fault diagnosis, and at the same time improves the robustness of fault diagnosis, thereby reducing the occurrence of DPF low efficiency fault false alarms during actual vehicle use.

[0133] As an optional embodiment, the present invention also provides an engine, including an engine body, a controller, a memory, and a program or instruction stored in the memory and executable on the controller. When the program or instruction is executed by the controller, the steps of the DPF low efficiency fault diagnosis method described in any of the above embodiments are implemented.

[0134] As an optional embodiment, the present invention also provides a working machine, including a working machine body, in which a DPF efficiency diagnostic processor is arranged; and also includes a memory and a program or instruction stored in the memory and executable on the DPF efficiency diagnostic processor, wherein the program or instruction is executed by the DPF efficiency diagnostic processor to execute the steps of the DPF low efficiency fault diagnosis method described in any of the above embodiments.

[0135] The working machine may be any of various working vehicles such as a diesel vehicle with a DPF mounted on the engine, and the present invention does not specifically limit this.

[0136] The operating machinery provided by the present invention combines the cumulative effective work and the DPF cumulative specific pressure difference to determine the DPF filtration efficiency, improves the recognition rate of DPF normal parts and DPF faulty parts, reduces the difficulty of DPF low efficiency fault diagnosis, improves the accuracy of DPF low efficiency fault diagnosis, and at the same time improves the robustness of fault diagnosis, thereby reducing the occurrence of DPF low efficiency fault false alarms during actual vehicle use.

[0137] Figure 7 is a schematic diagram of the structure of the electronic device provided by the present invention, such as Figure 7 As shown, the electronic device may include: a processor 710, a communication interface 720, a memory 730 and a communication bus 740, wherein the processor 710, the communication interface 720 and the memory 730 communicate with each other through the communication bus 740. The processor 710 may call the logic instructions in the memory 730 to execute the DPF inefficiency fault diagnosis method, which includes: obtaining the cumulative specific pressure difference and the cumulative effective work of the DPF in the target engine, the cumulative specific pressure difference is obtained by accumulating the instantaneous specific pressure difference of the DPF, and the instantaneous specific pressure difference at any time is the ratio between the pressure difference of the DPF at any time and the output power of the target engine; when it is determined that the cumulative effective work reaches the first threshold, obtaining the comparison result of the cumulative specific pressure difference and the effective specific pressure difference threshold to update the abnormal number of the DPF; the abnormal number is used to determine the low efficiency fault diagnosis result of the DPF.

[0138] In addition, the logic instructions in the above-mentioned memory 730 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0139] On the other hand, the present invention also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the DPF low efficiency fault diagnosis method provided by the above-mentioned embodiments, the method including: obtaining the cumulative specific pressure difference and the cumulative effective work of the DPF in the target engine, the cumulative specific pressure difference is obtained by accumulating the instantaneous specific pressure difference of the DPF, and the instantaneous specific pressure difference at any moment is the ratio between the pressure difference of the DPF at any moment and the output power of the target engine; when it is determined that the cumulative effective work reaches a first threshold, obtaining a comparison result of the cumulative specific pressure difference and the effective specific pressure difference threshold to update the number of abnormalities of the DPF; the number of abnormalities is used to determine the low efficiency fault diagnosis result of the DPF.

[0140] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute the DPF low efficiency fault diagnosis method provided in the above-mentioned embodiments, the method comprising: obtaining the cumulative specific pressure difference and the cumulative effective work of the DPF in the target engine, the cumulative specific pressure difference being obtained by accumulating the instantaneous specific pressure difference of the DPF, and the instantaneous specific pressure difference at any moment being the ratio between the pressure difference of the DPF at any moment and the output power of the target engine; when it is determined that the cumulative effective work reaches a first threshold, obtaining a comparison result of the cumulative specific pressure difference and the effective specific pressure difference threshold to update the number of abnormalities of the DPF; the number of abnormalities is used to determine the low efficiency fault diagnosis result of the DPF.

[0141] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0142] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0143] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for diagnosing low DPF efficiency faults, It is characterized in that include: Obtaining a cumulative specific pressure difference and a cumulative effective work of a DPF in a target engine, wherein the cumulative specific pressure difference is obtained by accumulating the instantaneous specific pressure difference of the DPF, and the instantaneous specific pressure difference at any moment is a ratio between the pressure difference of the DPF at any moment and the output power of the target engine; When it is determined that the accumulated effective work reaches a first threshold, obtaining a comparison result of the accumulated specific pressure difference with an effective specific pressure difference threshold to update the number of abnormalities of the DPF; The effective specific pressure difference threshold comprises a second threshold and a third threshold, and the second threshold is smaller than the third threshold; The obtaining of the comparison result of the cumulative specific pressure difference with the effective specific pressure difference threshold value to update the number of abnormal times of the DPF includes: If the accumulated specific pressure difference is less than the second threshold, the number of abnormalities of the DPF is increased by one; If the accumulated specific pressure difference is greater than the third threshold, the number of abnormalities of the DPF is reduced by one; After obtaining the comparison result of the cumulative specific pressure difference and the effective specific pressure difference threshold value to update the number of abnormal times of the DPF: Iteratively executing the step of obtaining the cumulative specific pressure difference and the cumulative effective work of the DPF in the target engine, until obtaining a comparison result of the cumulative specific pressure difference with an effective specific pressure difference threshold, so as to update the number of abnormalities of the DPF, until the current diagnosis cycle ends; Get the cumulative number of exceptions at the end of the current diagnosis cycle; The number of abnormalities is used to determine a low efficiency fault diagnosis result of the DPF.

2. The DPF low efficiency fault diagnosis method according to claim 1, It is characterized in that After obtaining the cumulative number of exceptions at the end of the current diagnostic cycle, it also includes: If it is determined that the accumulated number of abnormalities is greater than or equal to a fourth threshold, a fault signal is output.

3. The DPF low efficiency fault diagnosis method according to claim 1, It is characterized in that After obtaining the cumulative number of exceptions at the end of the current diagnostic cycle, it also includes: If the accumulated number of abnormalities in at least two consecutive diagnosis cycles is greater than or equal to a fourth threshold, a fault signal is output.

4. The DPF low efficiency fault diagnosis method according to any one of claims 2 to 3, It is characterized in that After obtaining the cumulative number of exceptions at the end of the current diagnostic cycle, it also includes: If the accumulated number of abnormalities is less than or equal to a fifth threshold, a fault clearing signal is output; The fifth threshold is smaller than the fourth threshold.

5. The DPF low efficiency fault diagnosis method according to claim 4, It is characterized in that After outputting the fault signal or outputting the fault clearing signal, the method further includes: setting the accumulated abnormal times to zero.

6. The DPF low efficiency fault diagnosis method according to claim 1, It is characterized in that Before obtaining the comparison result of the cumulative specific pressure difference and the effective specific pressure difference threshold value to update the number of abnormalities of the DPF, the method further includes: The effective specific pressure difference threshold is corrected using the carbon load of the DPF, the average temperature of the DPF and the exhaust flow rate.

7. The DPF low efficiency fault diagnosis method according to claim 1, It is characterized in that Before obtaining the cumulative specific pressure difference and the cumulative effective work of the DPF in the target engine, the method further includes: Acquiring engine operating parameters; the engine operating parameters include engine operating speed, engine torque, and at least one of the instantaneous pressure difference of the DPF, exhaust flow, carbon load of the DPF, and average temperature of the DPF; When it is determined that the engine operating parameters satisfy the diagnosis enabling condition, the cumulative specific pressure difference and the cumulative effective work of the DPF are obtained.

8. A DPF low efficiency fault diagnosis device, It is characterized in that include: A data acquisition unit, used to obtain the cumulative specific pressure difference and cumulative effective work of the DPF in the target engine, wherein the cumulative specific pressure difference is obtained by accumulating the instantaneous specific pressure difference of the DPF, and the instantaneous specific pressure difference at any moment is the ratio between the pressure difference of the DPF at any moment and the output power of the target engine; A fault diagnosis unit, for obtaining a comparison result between the cumulative specific pressure difference and an effective specific pressure difference threshold value to update the number of abnormalities of the DPF when it is determined that the cumulative effective work reaches a first threshold value; the effective specific pressure difference threshold value includes a second threshold value and a third threshold value, and the second threshold value is less than the third threshold value; the obtaining a comparison result between the cumulative specific pressure difference and the effective specific pressure difference threshold value to update the number of abnormalities of the DPF includes: if the cumulative specific pressure difference is less than the second threshold value, adding one to the number of abnormalities of the DPF; If the cumulative specific pressure difference is greater than the third threshold, the number of abnormalities of the DPF is reduced by one; after obtaining the comparison result of the cumulative specific pressure difference with the effective specific pressure difference threshold to update the number of abnormalities of the DPF: iteratively executing the step of obtaining the cumulative specific pressure difference and the cumulative effective work of the DPF in the target engine to obtain the comparison result of the cumulative specific pressure difference with the effective specific pressure difference threshold to update the number of abnormalities of the DPF, until the current diagnosis cycle ends; obtaining the cumulative number of abnormalities at the end of the current diagnosis cycle; The number of abnormalities is used to determine a low efficiency fault diagnosis result of the DPF.

9. An engine, comprising an engine body, It is characterized in that It also includes a controller, a memory, and a program or instruction stored in the memory and executable on the controller, wherein when the program or instruction is executed by the controller, the steps of the DPF low efficiency fault diagnosis method as described in any one of claims 1 to 7 are implemented.

10. A working machine, comprising a working machine body, It is characterized in that A DPF efficiency diagnostic processor is provided in the working machine body; it also includes a memory and a program or instruction stored in the memory and executable on the DPF efficiency diagnostic processor. When the program or instruction is executed by the DPF efficiency diagnostic processor, the steps of the DPF low efficiency fault diagnosis method as described in any one of claims 1 to 7 are implemented.

11. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, It is characterized in that When the processor executes the computer program, the steps of the DPF low efficiency fault diagnosis method according to any one of claims 1 to 7 are implemented.

12. A non-transitory computer-readable storage medium having a computer program stored thereon, It is characterized in that When the computer program is executed by a processor, the steps of the DPF inefficiency fault diagnosis method according to any one of claims 1 to 7 are implemented.

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