DPF regeneration frequent diagnostic methods, devices, vehicles, and computer-readable storage media

Abstract

This invention discloses a method, apparatus, vehicle, and computer-readable storage medium for diagnosing frequent DPF regeneration. The method calculates the cumulative regeneration time of all DPF regenerations (including normal regeneration, abnormal regeneration, parking regeneration, driving regeneration, complete regeneration completion, and incomplete regeneration completion) occurring within a diagnostic cycle. This cumulative regeneration time is compared to a set total regeneration time threshold. If the cumulative regeneration time exceeds the threshold, frequent regeneration is diagnosed. Since the total regeneration time threshold corresponds to the total DPF regeneration time at the allowable oil dilution rate, this diagnostic method avoids the unreliability caused by relying solely on the number of regenerations for frequent regeneration diagnosis, ensuring that each frequent regeneration diagnosis reflects the vehicle's actual regeneration conditions.

Description

Technical Field

[0001] This invention relates to the field of DPF regeneration diagnostic technology, and in particular to a method, apparatus, vehicle, and computer-readable storage medium for frequent regeneration diagnostics of DPF. Background Technology

[0002] To meet vehicle emission regulations, diesel vehicles commonly use DPF (Diesel Particulate Filter). When carbon particles accumulate to a set limit, the exhaust temperature needs to be increased through in-cylinder injection to regenerate the DPF. However, the diesel injection during regeneration is often excessive. Excess fuel that cannot be completely burned enters the oil pan along with the oil. If regeneration is too frequent, it can lead to oil dilution, affecting the lubrication and cooling of engine parts, causing engine damage, and in severe cases, even engine runaway.

[0003] Existing diagnostic methods for frequent DPF regeneration involve setting a fixed time or mileage cycle and comparing the actual number of regenerations within that cycle with the set regeneration limit to diagnose frequent regeneration. Chinese invention patent application CN107345495A discloses a method for diagnosing frequent regeneration of a diesel particulate filter (DPF). This method stores pre-set operating parameters and a recording cycle in the diesel vehicle, along with a maximum permissible number of DPF regenerations within the recording cycle, determined based on the vehicle's exhaust emission requirements. The method records the number of regeneration completions within the recording cycle. If the recorded number of completions exceeds the maximum permissible number, the DPF is considered to be regenerating frequently. However, this diagnostic method does not consider the vehicle's operating conditions within the diagnostic cycle, the duration of each regeneration, or the regeneration effect. Since incomplete regeneration often occurs during DPF regeneration, this results in a diagnosis of frequent regeneration even when the vehicle itself is not faulty, leading to low reliability of the diagnosis. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method for diagnosing frequent DPF regeneration, thereby improving the reliability of diagnosing frequent DPF regeneration.

[0005] The technical problem to be solved by the present invention is to provide a DPF regeneration diagnostic device, a vehicle, and a computer-readable storage medium.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] The present invention provides a method for diagnosing frequent DPF regeneration, comprising the following steps:

[0008] S1. Obtain the newly added accumulated carbon mass in the engine combustion carbon accumulation model;

[0009] S2. Determine whether the newly added carbon accumulation mass is equal to the preset trigger mass V. If yes, proceed to the next step; otherwise, return to S1.

[0010] S3. Obtain the DPF regeneration time Tn within the newly added carbon accumulation time interval corresponding to the preset trigger quality V, and store the regeneration time Tn in the storage unit. Then return to S1. Repeat this cycle until the end of the diagnostic cycle. Calculate the cumulative total regeneration time Tz, and determine whether the total DPF regeneration time Tz is greater than the threshold T for frequent regeneration diagnosis. If so, diagnose frequent regeneration, set the stored value of the storage unit to 0, and return to S1.

[0011] Furthermore, the diagnostic cycle is set as the time period during which the newly added carbon mass in the engine combustion carbon model increases from zero to the carbon mass of the DPF full-load carbon mass, which is a preset multiple K. The threshold T for the total duration of frequent regeneration diagnostics is the total DPF regeneration duration corresponding to the allowable dilution rate of the engine oil.

[0012] Furthermore, based on the performance differences of the vehicles, the preset multiplier K is between 1 and 3; the larger the value, the longer the diagnostic cycle. There are N storage units, where N is between 4 and 15, and the preset mass V = DPF full-load carbon accumulation mass * K / N.

[0013] Further, in step S3, during each diagnostic cycle, for every increase of the preset trigger mass V in the added carbon mass of the engine combustion carbon accumulation model, the ECU stores the DPF regeneration duration Tn within the newly added carbon accumulation time interval corresponding to the preset trigger mass V into one of the storage units, until all N storage units have stored values, performs a regeneration frequent diagnostic, and sets the stored values ​​of all storage units to 0 before returning to S1.

[0014] The method described in this invention sets a suitable fixed diagnostic cycle and calculates the cumulative regeneration time of all DPF regenerations (including normal regeneration, abnormal regeneration, parking regeneration, driving regeneration, complete regeneration completion, and incomplete regeneration completion) occurring within the diagnostic cycle. This cumulative regeneration time is compared with a set total regeneration time threshold. If the cumulative regeneration time exceeds the threshold, frequent regeneration is diagnosed. Since the total regeneration time threshold is the total DPF regeneration time corresponding to the allowable oil dilution rate, this diagnostic method avoids the unreliability caused by relying solely on the number of regenerations for frequent regeneration diagnosis, ensuring that the diagnostic results for frequent regeneration each time reflect the actual regeneration conditions of the vehicle. This method sets the diagnostic cycle to a fixed cycle, offering the advantage of simple diagnostic logic.

[0015] This invention also provides another method for diagnosing frequent DPF regeneration, comprising the following steps:

[0016] S1. Obtain the newly added accumulated carbon mass in the engine combustion carbon accumulation model;

[0017] S2. Determine whether the newly added carbon accumulation mass is equal to the preset trigger mass V. If yes, proceed to the next step; otherwise, return to S1.

[0018] S3. Determine whether the diagnostic cycle is the initial diagnostic cycle. If yes, proceed to step S4; otherwise, proceed to step S5.

[0019] S4. Obtain the DPF regeneration time Tn within the newly added carbon accumulation time interval corresponding to the preset trigger quality V, and store the regeneration time Tn in the storage unit. Then return to S1. Repeat this cycle until the end of the initial diagnosis cycle. Calculate the cumulative total regeneration time Tz and determine whether the total DPF regeneration time Tz is greater than the threshold T for the total regeneration frequency diagnosis. If so, diagnose the initial diagnosis cycle as regeneration frequency.

[0020] S5, obtain the DPF regeneration time Tn within the newly added carbon accumulation time interval corresponding to the preset trigger quality V, and store the regeneration time Tn in the storage unit. Calculate the cumulative total regeneration time Tz, and determine whether the total DPF regeneration time Tz is greater than the total regeneration time threshold T for frequent regeneration diagnosis. If so, diagnose frequent regeneration, and then return to S1.

[0021] Furthermore, the initial diagnostic cycle is set as the time period during which the newly added carbon mass in the engine combustion carbon model increases from zero to the carbon mass of the DPF full-load carbon mass, which is a preset multiple K. The threshold T for the total duration of frequent regeneration diagnostics is the total DPF regeneration duration corresponding to the allowable dilution rate of the engine oil.

[0022] Furthermore, based on the performance differences of the vehicles, the preset multiplier K is between 1 and 3; the larger the value, the longer the initial diagnostic cycle. There are N storage units, where N is between 4 and 15, and the preset trigger mass V = DPF full-load carbon accumulation mass * K / N.

[0023] Further, in step S3, for each increase of the newly accumulated carbon mass in the engine combustion carbon accumulation model by a preset trigger mass V, the ECU stores the DPF regeneration duration Tn within the newly accumulated carbon time interval corresponding to the preset trigger mass V into one of the storage units, until all N storage units have stored values, performs the initial diagnostic cycle regeneration frequent diagnosis, and increments the diagnostic cycle value by 1; in step S5, when storing the DPF regeneration duration Tn within the newly accumulated carbon time interval corresponding to the preset trigger mass V into the storage unit, the N storage units are used in a cyclic overwrite manner, and the regeneration frequent diagnosis is performed every time the DPF regeneration duration Tn is obtained.

[0024] In addition to the improved diagnostic reliability of the first method for frequent regeneration diagnosis, this method sets the diagnostic cycle to an initial diagnostic cycle and subsequent diagnostic cycles. The diagnosis in the initial diagnostic cycle is the same as the first method, while in the subsequent diagnostic cycles, a diagnosis is triggered once for every increase in the preset trigger mass of newly added carbon mass. This allows for more timely diagnosis of frequent regeneration faults.

[0025] The present invention provides a DPF regeneration frequent diagnostic device including an electronic control unit (ECU), the ECU comprising:

[0026] The combustion carbon accumulation model calculation module is used to calculate the newly added carbon accumulation mass in the engine combustion carbon accumulation model;

[0027] The combustion carbon accumulation mass acquisition module is used to acquire the newly added carbon accumulation mass in the engine combustion carbon accumulation model;

[0028] The DPF regeneration duration acquisition module is used to obtain the DPF regeneration duration Tn.

[0029] The carbon accumulation quality judgment module is used to determine whether the newly added carbon accumulation quality is equal to the preset trigger quality V;

[0030] The frequent regeneration diagnosis module is used to compare whether the total regeneration time Tz of DPF is greater than the threshold T for frequent regeneration diagnosis; and

[0031] The storage module is used to store the acquired DPF regeneration time Tn.

[0032] Furthermore, it also includes a diagnostic cycle flag module for setting a diagnostic cycle flag and a diagnostic cycle judgment module for determining whether the diagnostic cycle is the initial diagnostic cycle.

[0033] The storage module has 4-15 storage units.

[0034] The present invention also provides a vehicle including the aforementioned DPF regeneration frequent diagnostic device.

[0035] The present invention also provides a computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, controls the device where the storage medium is located to perform the DPF regeneration frequent diagnosis method described above. Attached Figure Description

[0036] Figure 1 This is a flowchart illustrating the frequent regeneration diagnostic method for DPD according to Embodiment 1 of the present invention;

[0037] Figure 2 This is a schematic diagram of the storage method of the storage unit in Embodiment 1 of the present invention;

[0038] Figure 3 This is a flowchart illustrating the frequent DPF regeneration diagnosis method according to Embodiment 2 of the present invention.

[0039] Figure 4 This is a schematic diagram of the storage method of the storage unit in Embodiment 2 of the present invention;

[0040] Figure 5 This is a schematic diagram of the DPD regeneration frequent diagnostic device according to Embodiment 3 of the present invention;

[0041] Figure 6 This is a schematic diagram of the DPD regeneration frequent diagnostic device according to Embodiment 4 of the present invention. Detailed Implementation

[0042] Example 1:

[0043] like Figure 1 As shown, the diagnostic method for frequent DPF regeneration includes the following steps:

[0044] S1. Obtain the newly added accumulated carbon mass in the engine combustion carbon accumulation model.

[0045] S2. Determine whether the newly added carbon accumulation mass is equal to the preset trigger mass V. If yes, proceed to the next step; otherwise, return to S1.

[0046] The preset trigger quality V = DPF full-load accumulated carbon mass * K / N, where K is a preset multiple of the DPF full-load accumulated carbon mass, ranging from 1 to 3. The value of K determines the length of the diagnostic cycle and can be determined according to the vehicle's performance. For example, for high-end vehicles with good engine combustion performance and slower carbon accumulation, the value of K can be 3. In this case, a longer diagnostic cycle does not affect the effectiveness of frequent DPF regeneration diagnostics. If the vehicle performance is poor, the value of K can be 1 or 2. N is the number of storage units, ranging from 4 to 15. The value of N determines the size of the preset trigger quality V. The larger the value of N, the smaller the preset trigger quality V, which means that the time interval for the ECU to obtain the newly added carbon mass of the engine combustion carbon accumulation model is smaller, and the frequency of the ECU obtaining the regeneration time is higher, which is beneficial to improving the reliability of frequent regeneration diagnostics. For example, if a certain vehicle model has a DPF full load carbon accumulation of 20g, 8 storage units, and a preset multiplier K of 3, then the preset trigger mass V = 20 * 3 / 8 = 7.5g. This means that the ECU will trigger a regeneration time reading once every time it acquires an engine combustion carbon accumulation model with an additional 7.5g of accumulated carbon mass.

[0047] S3. Obtain the DPF regeneration time Tn within the newly added carbon accumulation time interval corresponding to the preset trigger quality V, and store the regeneration time Tn in the storage unit. Then return to S1. Repeat this cycle until the end of the diagnostic cycle. Calculate the cumulative total regeneration time Tz, and determine whether the total DPF regeneration time Tz is greater than the threshold T for frequent regeneration diagnosis. If so, diagnose frequent regeneration, set the stored value of the storage unit to 0, and return to S1.

[0048] The diagnostic cycle is set as the time period during which the accumulated carbon mass in the engine combustion carbon model increases from zero to the accumulated carbon mass of the DPF at full load, a preset multiple K. The total diagnostic time threshold T for frequent regeneration is the total DPF regeneration time corresponding to the allowable oil dilution rate. During regeneration, diesel injection is often excessive. Excess fuel that cannot be completely burned will enter the oil pan. If regeneration is too frequent, it will lead to oil dilution. Vehicles are equipped with a maximum allowable oil dilution rate (e.g., 6%), and the total regeneration time corresponding to this oil dilution rate is set as the total diagnostic time threshold T for frequent regeneration. During vehicle development, oil composition is sampled and analyzed. By measuring the oil composition, when the maximum allowable oil dilution rate is reached, the total regeneration time of various DPF regeneration events is used as the total diagnostic time threshold T for frequent regeneration. The diagnostic cycle is calculated based on the accumulated carbon mass of the DPF at full load, a preset multiple K, and the engine's combustion carbon model.

[0049] In step S3, during each diagnostic cycle, for every increase of the preset trigger mass V in the added carbon mass of the engine combustion carbon accumulation model, the ECU stores the DPF regeneration duration Tn within the newly added carbon accumulation time interval corresponding to the preset trigger mass V into one of the storage units, until all N storage units have stored values. Then, a regeneration frequent diagnostic is performed, and the stored values ​​of all storage units are set to 0 before returning to S1.

[0050] like Figure 2 As shown, the storage units are set to 8. For each new accumulated carbon mass generated by engine combustion with a preset trigger mass V, the ECU reads the DPF regeneration time Tn within the new accumulated carbon time interval and stores it sequentially in the 8 storage units, as shown in the figure. The regeneration times Tn stored in the 8 storage units are t1, t2, t3, t4, t5, t6, t7, and t8, respectively, until all 8 storage units have stored time values. At this point, the ECU controls a regeneration frequent diagnostic to calculate the cumulative total regeneration time Tz (e.g., ...). Figure 2 The diagnostic process (Diagnosis 1) determines whether the total DPF regeneration time (Tz) exceeds the threshold T for frequent regeneration diagnosis. If so, it diagnoses frequent regeneration. After the first diagnosis, all stored values ​​are set to 0, and the next diagnosis cycle begins, repeating this cycle.

[0051] In this embodiment, all diagnostic cycles are set to a uniform time period, which simplifies the diagnostic logic. This is especially useful for vehicles with good engine performance, as it meets the need for frequent DPF regeneration diagnostics.

[0052] Example 2:

[0053] This embodiment provides another method for diagnosing frequent DPF regeneration, different from Embodiment 1; the same content will not be repeated. For example... Figure 3 As shown, it includes the following steps:

[0054] S1. Obtain the newly added accumulated carbon mass in the engine combustion carbon accumulation model;

[0055] S2. Determine whether the newly added carbon accumulation mass is equal to the preset trigger mass V. If yes, proceed to the next step; otherwise, return to S1.

[0056] S3. Determine whether the diagnostic cycle is the initial diagnostic cycle. If yes, proceed to step S4; otherwise, proceed to step S5.

[0057] S4. Obtain the DPF regeneration time Tn within the newly added carbon accumulation time interval corresponding to the preset trigger quality V, and store the regeneration time Tn in the storage unit. Then return to S1. Repeat this cycle until the end of the initial diagnosis cycle. Calculate the cumulative total regeneration time Tz and determine whether the total DPF regeneration time Tz is greater than the threshold T for the total regeneration frequency diagnosis. If so, diagnose the initial diagnosis cycle as regeneration frequency.

[0058] S5, obtain the DPF regeneration time Tn within the newly added carbon accumulation time interval corresponding to the preset trigger quality V, and store the regeneration time Tn in the storage unit. Calculate the cumulative total regeneration time Tz, and determine whether the total DPF regeneration time Tz is greater than the total regeneration time threshold T for frequent regeneration diagnosis. If so, diagnose frequent regeneration, and then return to S1.

[0059] The initial diagnostic cycle is set to the time period during which the newly added carbon mass in the engine combustion carbon accumulation model increases from zero to a preset multiple K of the DPF full-load carbon accumulation mass. For example... Figure 4As shown, in the initial diagnostic cycle, the ECU obtains the DPF regeneration duration Tn, the storage method of the regeneration duration, and the method for diagnosing whether regeneration is frequent, which is the same as in Example 1, and will not be repeated here. After the initial diagnosis, the diagnostic cycle value is incremented by 1 so that the ECU can determine whether it is the initial diagnostic cycle. Unlike Example 1, in the diagnosis after the initial diagnosis, when storing the DPF regeneration duration Tn corresponding to the newly added carbon accumulation time interval of the preset trigger quality V in the storage unit, a cyclic overwrite method is used for the N storage units, and a frequent regeneration diagnosis is performed every time the DPF regeneration duration Tn is obtained. Specifically, during the initial diagnostic cycle, when performing the first diagnosis, all eight storage units store the DPF regeneration time value. After the initial diagnosis, the regeneration time value in the storage units is not cleared. During the second diagnosis, the ECU overwrites the DPF regeneration time T1 stored in the initial diagnostic cycle with the newly acquired DPF regeneration time T9. The other seven storage units still store t2, t3, t4, t5, t6, t7, and t8 from the previous cycle. During the second diagnosis, the sum of t9 and t2, t3, t4, t5, t6, t7, and t8 is used as the cumulative total time. It is then determined whether the total DPF regeneration time is greater than the threshold T for frequent regeneration diagnosis. If so, it is diagnosed as frequent regeneration. Subsequent diagnoses follow the same pattern.

[0060] In addition to the improved diagnostic reliability of the frequent regeneration diagnostic method described in Example 1, this method sets the diagnostic cycle to an initial diagnostic cycle and a subsequent diagnostic cycle. The diagnostics in the initial diagnostic cycle are the same as in the first method, while in the subsequent diagnostic cycle, a diagnostic is triggered once for every increase of the preset trigger mass in the added carbon mass. This allows for more timely diagnosis of frequent regeneration faults.

[0061] Example 3:

[0062] like Figure 5 As shown, the DPF regeneration frequent diagnostic device includes an electronic control unit (ECU), which includes:

[0063] The combustion carbon accumulation model calculation module is used to calculate the newly added carbon accumulation mass in the engine combustion carbon accumulation model;

[0064] The combustion carbon accumulation mass acquisition module is used to acquire the newly added carbon accumulation mass in the engine combustion carbon accumulation model;

[0065] The DPF regeneration duration acquisition module is used to obtain the DPF regeneration duration Tn.

[0066] The carbon accumulation quality judgment module is used to determine whether the newly added carbon accumulation quality is equal to the preset trigger quality V;

[0067] The frequent regeneration diagnosis module is used to compare whether the total regeneration time Tz of DPF is greater than the threshold T for frequent regeneration diagnosis; and

[0068] A storage module is used to store the acquired DPF regeneration time Tn. The storage module has 4-15 storage units.

[0069] The frequent DPF regeneration diagnostic device described in Example 3 can be used to implement the frequent DPF regeneration diagnostic method as described in Example 1.

[0070] Example 4:

[0071] To implement the DPF regeneration frequent diagnosis method as described in Example 2, the DPF regeneration frequent diagnosis device of this embodiment also needs to add a diagnosis cycle flag module and a diagnosis cycle judgment module based on Example 3. The diagnosis cycle flag module is used to set the diagnosis cycle flag, and the diagnosis cycle judgment module is used to determine whether the diagnosis cycle is the initial diagnosis cycle.

[0072] Example 5:

[0073] The vehicle in this embodiment includes the DPF regeneration frequent diagnostic device described in Embodiment 3 or Embodiment 4. The vehicle includes automobiles, engineering vehicles, and diesel-powered vehicles.

[0074] Example 6:

[0075] This embodiment provides a computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, controls the device where the storage medium is located to perform the DPF regeneration frequent diagnosis method described in Embodiment 1 or Embodiment 2.

Claims

1. A method for diagnosing frequent DPF regeneration, characterized in that, Includes the following steps: S1. Obtain the newly added accumulated carbon mass in the engine combustion carbon accumulation model; S2. Determine whether the newly added carbon accumulation mass is equal to the preset trigger mass V. If yes, proceed to the next step; otherwise, return to S1. S3. Obtain the DPF regeneration time Tn within the newly added carbon accumulation time interval corresponding to the preset trigger quality V, and store the regeneration time Tn in the storage unit. Then return to S1. Repeat this cycle until the end of the diagnostic cycle. Calculate the cumulative total regeneration time Tz, and determine whether the total DPF regeneration time Tz is greater than the threshold T for frequent regeneration diagnosis. If so, diagnose frequent regeneration, set the stored value of the storage unit to 0, and return to S1.

2. The method for diagnosing frequent DPF regeneration according to claim 1, characterized in that, The diagnostic cycle is set as the time period during which the newly added carbon mass in the engine combustion carbon model increases from zero to the carbon mass of the DPF full-load carbon mass, which is a preset multiple K. The threshold T for the total time of frequent regeneration diagnosis is the total DPF regeneration time corresponding to the allowable dilution rate of the engine oil.

3. The method for diagnosing frequent DPF regeneration according to claim 2, characterized in that, The preset multiple K takes a value between 1 and 3.

4. The method for diagnosing frequent DPF regeneration according to claim 3, characterized in that, The storage unit has N units, and the preset trigger quality V = DPF full load carbon accumulation quality * K / N.

5. The method for diagnosing frequent DPF regeneration according to claim 4, characterized in that, The value of N is between 4 and 15.

6. The method for diagnosing frequent DPF regeneration according to claim 4, characterized in that, In step S3, during each diagnostic cycle, for every increase of the preset trigger mass V in the added carbon mass of the engine combustion carbon accumulation model, the ECU stores the DPF regeneration duration Tn within the newly added carbon accumulation time interval corresponding to the preset trigger mass V into one of the storage units, until all N storage units have stored values. Then, a regeneration frequent diagnostic is performed, and the stored values ​​of all storage units are set to 0 before returning to S1.

7. A method for diagnosing frequent DPF regeneration, characterized in that, Includes the following steps: S1. Obtain the newly added accumulated carbon mass in the engine combustion carbon accumulation model; S2. Determine whether the newly added carbon accumulation mass is equal to the preset trigger mass V. If yes, proceed to the next step; otherwise, return to S1. S3. Determine whether the diagnostic cycle is the initial diagnostic cycle. If yes, proceed to step S4; otherwise, proceed to step S5. S4. Obtain the DPF regeneration time Tn within the newly added carbon accumulation time interval corresponding to the preset trigger quality V, and store the regeneration time Tn in the storage unit. Then return to S1. Repeat this cycle until the end of the initial diagnosis cycle. Calculate the cumulative total regeneration time Tz and determine whether the total DPF regeneration time Tz is greater than the threshold T for the total regeneration frequency diagnosis. If so, diagnose the initial diagnosis cycle as regeneration frequency. S5, obtain the DPF regeneration time Tn within the newly added carbon accumulation time interval corresponding to the preset trigger quality V, and store the regeneration time Tn in the storage unit. Calculate the cumulative total regeneration time Tz, and determine whether the total DPF regeneration time Tz is greater than the total regeneration time threshold T for frequent regeneration diagnosis. If so, diagnose frequent regeneration, and then return to S1.

8. The method for diagnosing frequent DPF regeneration according to claim 7, characterized in that, The initial diagnostic cycle is set as the time period during which the newly added carbon mass in the engine combustion carbon accumulation model increases from zero to the carbon mass of the DPF full-load carbon accumulation, which is a preset multiple K. The threshold T for the total duration of frequent regeneration diagnostics is the total DPF regeneration duration corresponding to the allowable dilution rate of the engine oil.

9. The method for diagnosing frequent DPF regeneration according to claim 8, characterized in that, The preset multiple K takes a value between 1 and 3.

10. The method for diagnosing frequent DPF regeneration according to claim 9, characterized in that, The storage unit has N units, and the preset trigger quality V = DPF full load carbon accumulation quality * K / N.

11. The method for diagnosing frequent DPF regeneration according to claim 10, characterized in that, The value of N is between 4 and 15.

12. The method for diagnosing frequent DPF regeneration according to claim 10, characterized in that, In step S3, for every increase of the preset trigger mass V in the newly added carbon accumulation mass of the engine combustion carbon accumulation model, the ECU stores the DPF regeneration time Tn within the newly added carbon accumulation time interval corresponding to the preset trigger mass V into one of the storage units until all N storage units have stored values, performs the initial diagnostic cycle regeneration frequent diagnosis, and increments the diagnostic cycle value by 1. In step S5, when storing the DPF regeneration duration Tn within the newly added carbon accumulation time interval corresponding to the preset trigger quality V, the N storage units are cyclically overwritten, and a frequent regeneration diagnosis is performed every time the DPF regeneration duration Tn is obtained.

13. A diagnostic device for frequent DPF regeneration, characterized in that, Includes an electronic control unit (ECU), the ECU comprising: The combustion carbon accumulation model calculation module is used to calculate the newly added carbon accumulation mass in the engine combustion carbon accumulation model; The combustion carbon accumulation mass acquisition module is used to acquire the newly added carbon accumulation mass in the engine combustion carbon accumulation model; The DPF regeneration duration acquisition module is used to obtain the DPF regeneration duration Tn. The carbon accumulation quality judgment module is used to determine whether the newly added carbon accumulation quality is equal to the preset trigger quality V; The frequent regeneration diagnosis module is used to compare whether the total regeneration time Tz of DPF is greater than the threshold T for frequent regeneration diagnosis; and The storage module is used to store the acquired DPF regeneration time Tn.

14. The DPF regeneration frequent diagnostic device according to claim 13, characterized in that, It also includes a diagnostic cycle flag module for setting diagnostic cycle flags and a diagnostic cycle judgment module for determining whether the diagnostic cycle is the initial diagnostic cycle.

15. The DPF regeneration frequent diagnostic device according to claim 13 or 14, characterized in that, The storage module has 4-15 storage units.

16. A vehicle, characterized in that, Includes an electronic control unit (ECU), wherein the electronic control unit (ECU) includes: The combustion carbon accumulation model calculation module is used to calculate the newly added carbon accumulation mass in the engine combustion carbon accumulation model; The combustion carbon accumulation mass acquisition module is used to acquire the newly added carbon accumulation mass in the engine combustion carbon accumulation model; The DPF regeneration duration acquisition module is used to obtain the DPF regeneration duration Tn. The carbon accumulation quality judgment module is used to determine whether the newly added carbon accumulation quality is equal to the preset trigger quality V; The frequent regeneration diagnosis module is used to compare whether the total regeneration time Tz of DPF is greater than the threshold T for frequent regeneration diagnosis; and The storage module is used to store the acquired DPF regeneration time Tn.

17. The vehicle according to claim 16, characterized in that, It also includes a diagnostic cycle flag module for setting diagnostic cycle flags and a diagnostic cycle judgment module for determining whether the diagnostic cycle is the initial diagnostic cycle.

18. The vehicle according to claim 16 or 17, characterized in that, The storage module has 4-15 storage units.

19. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, wherein the computer program, when executed by a processor, controls the device where the storage medium is located to perform the DPF regeneration frequent diagnostic method according to any one of claims 1-12.

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