A hybrid vehicle fault diagnosis method, device, storage medium and controller

Abstract

The present application belongs to the technical field of vehicle engineering, and particularly relates to a hybrid vehicle fault diagnosis method and device, a storage medium and a controller. In view of the defect of misjudgment of temperature fault in the cold start verification process of the hybrid vehicle, the possible loophole in the standby process of the vehicle is eliminated by introducing the machine time reset process, and the effectiveness of signal detection in the related discrimination process is ensured. On the one hand, the data that may lead to misjudgment is filtered from the working condition selection angle. On the other hand, the faults that are prone to occur in the positive temperature coefficient (PTC) component heating radiation interference, three-way valve abnormality and pure electric operation are processed in a targeted manner. On the basis of reasonable selection of action threshold, the method and product can effectively reduce the misjudgment rate, and an effective solution is given for the positive and negative temperature drift. It is beneficial to avoid the engine abnormal protection process and improve the operation efficiency.

Description

Technical Field

[0001] This invention belongs to the field of vehicle engineering technology, and in particular relates to a method, device, storage medium and controller for diagnosing faults in hybrid vehicles. Background Technology

[0002] Temperature monitoring and control is one of the important safeguards for the safe and efficient operation of intelligent vehicles. It can prevent problems such as engine starting failure or increased emissions caused by abnormal temperature. In particular, the cold start calibration process is often used to diagnose temperature drift problems that may be exposed after the vehicle has been stopped for a certain period of time.

[0003] Given that temperatures gradually converge as downtime continues; and assuming no faults exist, temperature sensors located at different positions will obtain the following data: Figure 1 The temperature distribution characteristics shown indicate that the temperatures from each temperature sensor will be distributed around a certain reference temperature value 001 with a sufficiently small deviation.

[0004] If certain faults exist, then the following may occur: Figure 2 or Figure 3 The situation shown; in which, Figure 2 This is a positive offset fault. Figure 3 This is a negative offset fault; in practical applications, it is urgent to solve the problem of false alarms in cold start verification of hybrid vehicles in some scenarios.

[0005] Firstly, false alarms may occur when the hybrid vehicle's PTC (Positive Temperature Coefficient) heating unit is turned on for an extended period of time; secondly, when the hybrid vehicle is charging in a low-temperature operating environment or when the heater is turned on remotely; and thirdly, when there is a leak or improper closure of the three-way valve or other components in the hybrid vehicle's cooling system. Summary of the Invention

[0006] This invention discloses a hybrid vehicle fault diagnosis method, including a first time reset step, a second standby scan step, and a fourth cold start verification step; the first time reset step obtains the operating condition information of the vehicle to be diagnosed, and if the power-down action of the vehicle is detected, the preset first downtime is reset to zero.

[0007] In the second standby scan step, the first downtime can be corrected and the first current value of the first downtime can be obtained through a continuation process or a suppression process.

[0008] Furthermore, if other preset conditions are met at this time, then in the fourth cold start verification step, the vehicle's preset cold start verification process is executed according to the magnitude of the first current value.

[0009] If the first current value is less than or equal to the preset second shutdown time threshold TS, then the third verification exit step is entered. The third verification exit step can exit or end the cold start verification process of the vehicle and / or send a condition not met message to a preset display or prompt component. If the second standby scan step detects that the vehicle is in a power-off state, and the ambient temperature, power level and / or the first current value all reach their respective preset thresholds, then the third charging information of the vehicle is further detected. If the charging time of the vehicle reaches the preset time threshold and the first current value meets the fault diagnosis requirements, then the third suppression flag information is generated until the vehicle enters the next driving cycle and exits the diagnostic process.

[0010] Furthermore, the hybrid vehicle fault diagnosis method may also include a third scenario triggering step; this third scenario triggering step may trigger the vehicle's driving cycle validity flag DV or call the comparison process of the first downtime when the vehicle is started; and then determine whether to enter the diagnosis process through the comparison process.

[0011] The fourth cold start verification step can obtain a reference temperature value based on the temperature sequence detected at a preset location on the engine and / or vehicle; the temperature sequence includes at least three or more temperature values ​​collected from the engine and / or vehicle.

[0012] Furthermore, if at least one fourth interference temperature exists in the above temperature sequence such that the fourth absolute value of the difference between the fourth interference temperature and the reference temperature value is greater than the fourth temperature difference threshold, then a cold start verification fault is reported at the detection location corresponding to the fourth interference temperature; otherwise, normal system information can be reported or the cold start verification process can be exited.

[0013] Specifically, the fourth cold start verification step can also obtain the first average temperature of the temperature sequence, and then remove the fifth singular temperature item in the temperature sequence that has the largest deviation from the first average temperature, to obtain the second average temperature of the new temperature sequence after the fifth singular temperature item has been removed, and the second average temperature can be used as a reference temperature value for the judgment process of the fourth cold start verification step.

[0014] In practical applications, if the first current value is greater than 8 hours or greater than the second downtime threshold TS, a cold start verification process can be performed to detect abnormal temperature areas.

[0015] Accordingly, the present invention also discloses a hybrid vehicle fault diagnosis device, including a first time reset unit, a second standby scanning unit, and a fourth cold start verification unit; the first time reset unit acquires vehicle operating condition information; if a power-down action of the vehicle is detected, its first downtime must be reset to zero to avoid misjudgment.

[0016] Specifically, the first downtime can be corrected by the second standby scanning unit through a continuation process or a suppression process, and the first current value of the first downtime can be obtained; the fourth cold start verification unit can execute the vehicle's preset cold start verification process according to the first current value, thereby realizing the fault detection process.

[0017] If the first current value is less than or equal to the preset second shutdown time threshold TS, the third verification exit process can be entered. The third verification exit process will end the cold start verification process of the vehicle and / or send the condition not met information to the preset display or prompt component to avoid the occurrence of misjudgment and save data processing implementation. If the second standby scanning unit detects that the vehicle is in a power-off state and the ambient temperature, power, and / or the first current value have all reached their respective preset thresholds, the third charging information of the vehicle will be further detected. If the charging time of the vehicle reaches the preset time threshold and the first current value meets the fault diagnosis requirements, the third suppression flag information will be generated until the vehicle enters the next driving cycle and exits the diagnosis process.

[0018] Furthermore, the hybrid vehicle fault diagnosis device may also be equipped with a third scenario triggering unit; the third scenario triggering unit may trigger the vehicle's driving cycle validity flag DV or recall the comparison / judgment process of the first downtime when the vehicle is started.

[0019] The fourth cold start verification unit can obtain a reference temperature value based on the temperature sequence detected at a preset location on the engine and / or vehicle. The temperature sequence can be at least three or three temperature values ​​collected from the engine and / or vehicle.

[0020] Furthermore, if at least one fourth interference temperature exists in the above temperature sequence such that the fourth absolute value of the difference between the fourth interference temperature and the reference temperature value is greater than the fourth temperature difference threshold, then a cold start verification fault is reported at the detection location corresponding to the fourth interference temperature; otherwise, normal system information is reported or the cold start verification process is exited.

[0021] Specifically, its fourth cold start verification unit can obtain the first average temperature of the temperature sequence, remove the fifth singular temperature item in the temperature sequence that has the largest deviation from the first average temperature; then obtain the second average temperature of the temperature sequence after the fifth singular temperature item has been removed, and use the second average temperature as a reference temperature value for the judgment process of the fourth cold start verification unit.

[0022] Similarly, in practical applications, if the first current value is greater than 8 hours or greater than the second downtime threshold TS, a cold start verification process will be executed; for example... Figure 14The example shown in this embodiment illustrates the temperature acquisition process. Tmin represents the minimum value of all temperature sensor values ​​from power-on to startup; Tmax represents the maximum value of all temperature sensor values ​​from power-on to startup; Mtmin represents the average value after removing Tmax; Mtmax represents the average value after removing Tmin; if the reference temperature is denoted as mwdotmcs_w, then: When (Mtmin-Tmin) is less than (Tmax-Mtmax), set mwdotmcs_w=Mtmin; When (Mtmin-Tmin) is greater than (Tmax-Mtmax), set mwdotmcs_w=Mtmax; The application system should ensure that there are at least three temperature sensors to provide intermediate data to ensure stable acquisition of the above temperature reference values; in addition, if the ambient temperature comes from model calculations, it should not be included in the cold machine verification calculations.

[0023] Furthermore, the present invention also discloses a product line with the inventive concept: including a computer storage medium and a corresponding series of controllers; the computer storage medium includes a storage medium body for storing a computer program; when the computer program is executed by a microprocessor, it can implement the hybrid vehicle fault diagnosis method as described above; the controller may include the hybrid vehicle fault diagnosis device as described above and / or the computer storage medium as described above and further avoid misjudgment processes encountered during use.

[0024] In summary, this invention addresses the defect of misjudging temperature faults during the cold start verification process of hybrid vehicles by introducing a time reset process to eliminate potential loopholes in the vehicle standby process and ensure the effectiveness of signal detection during the relevant judgment process.

[0025] On the one hand, data that may lead to misjudgment is filtered out from the perspective of operating condition selection; on the other hand, targeted treatments are carried out for PTC component heating radiation interference, three-way valve abnormalities, and faults that are more likely to occur in pure electric operation; based on the reasonable selection of action thresholds, its methods and products can effectively reduce the misjudgment rate and provide effective solutions for both forward and reverse temperature drift; it is conducive to avoiding the abnormal protection process of the engine and improving operating efficiency.

[0026] It should be noted that the terms "first," "second," and similar terms used in this article are merely for describing the constituent elements of the technical solution and do not constitute a limitation on the technical solution, nor should they be interpreted as an indication or implication of the importance of the corresponding elements; elements with terms such as "first," "second," or similar terms indicate that at least one of the elements is included in the corresponding technical solution. Attached Figure Description

[0027] To more clearly illustrate the technical solution of the present invention and facilitate a further understanding of its technical effects, features, and objectives, the present invention will be described in detail below with reference to the accompanying drawings. The drawings constitute an essential part of the specification and are used together with Embodiment 1 of the present invention to illustrate the technical solution of the present invention, but do not constitute a limitation on the present invention.

[0028] The same reference numerals in the attached diagrams represent the same parts, specifically: Figure 1 This describes the temperature distribution detected by different temperature sensors under fault-free conditions and its relationship with the reference temperature value.

[0029] Figure 2 This is a schematic diagram of the temperature distribution caused by the positive offset of the cold start temperature.

[0030] Figure 3 This is a schematic diagram of the temperature distribution caused by the negative offset of the cold start temperature.

[0031] Figure 4 This is a schematic diagram of the cold start verification sub-process of an embodiment of the method of the present invention.

[0032] Figure 5 This is an example of the engine temperature rise phenomenon (speed 0) when the heater is on for a long time in a pure electric parking vehicle according to an embodiment of the present invention.

[0033] Figure 6 This is a schematic diagram of the heating air circulation structure in pure electric operation with a three-way valve, according to an embodiment of the present invention.

[0034] Figure 7 This is a flowchart illustrating an embodiment of the method of the present invention. Figure 1 .

[0035] Figure 8 , Figure 9 This is a flowchart illustrating an embodiment of the method of the present invention. Figure 2 Flowchart Figure 3 .

[0036] Figure 10 This is a schematic diagram of the structural composition of an embodiment of the device of the present invention.

[0037] Figure 11 This is a schematic diagram of the product layout structure of the present invention. Figure 1 .

[0038] Figure 12 This is a schematic diagram of the product layout structure of the present invention. Figure 2 .

[0039] Figure 13 This is a schematic diagram of the product layout structure of the present invention. Figure 3 ; Figure 14 This is a schematic diagram of the reference temperature acquisition process in an embodiment of the present invention.

[0040] in: T1 - Temperature of the first sensor; T2 - Temperature of the second sensor; T3 - Temperature of the third sensor; T4 - Temperature of the fourth sensor; 001 - Reference temperature value; Example of temperature T2 during negative offset disturbance (020); Example of temperature T3 during positive offset disturbance (030); 051 - Engine temperature rise curve; 052 - Engine speed curve; 100 - First machine reset procedure; 200 - Second standby scan step; 210 - Continuation process; 220-Inhibition process; 300 - Third Scene Triggering Steps; 333 - Verification and exit steps; 400 - Fourth cold start verification step; 410 - Reference Temperature Confirmation Procedure; 411, 412, 413, 414 - Intermediate temperature parameter data; 611 - Generator; 612 - Front motor; 621 - Compressor; 622-Three-way valve; 623 - Heat exchanger; 631-Pump; 632 - Evaporator; 633 - Plumbing core; 634-Flow Three-Way; 635 - Refrigerant shut-off valve; 641 - Turbocharger; 642-EGR cooler; 643 - High-Temperature Kettle; 644 - Thermostat; 645-Engine; 651 - Condenser; 652 - Intercooler; 653 - Low-temperature radiator; 654 - High-Temperature Radiator; 655-Low Temperature Kettle; 700-Hybrid Vehicle Fault Diagnosis Device; 710 - First Machine Time Reset Unit; 720 - Second standby scanning unit; 730 - Third Scene Trigger Unit; 740 - Fourth Cold Start Verification Unit; 900 - Vehicles; 901 - Controller; 903 - Computer storage media; 909-Battery Pack. Implementation

[0041] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Of course, the specific embodiments described below are merely illustrative of the technical solutions of the present invention, and not intended to limit the invention. Furthermore, the parts described in the embodiments or drawings are merely illustrative examples of relevant parts of the present invention, and not the entirety of the invention.

[0042] like Figure 8 The hybrid vehicle fault diagnosis method shown includes a first time reset step 100, a second standby scan step 200, and a fourth cold start verification step 400; the first time reset step 100 obtains as follows: Figures 11 to 13 The operating condition information of vehicle 900 shown.

[0043] Furthermore, if a power-down action of vehicle 900 is detected, the first downtime must be reset to zero. At this time, if the second standby scan step 200 corrects the first downtime through a continuation process 210 or a suppression process 220, and obtains the first current value of the first downtime, then the vehicle 900's preset cold start verification process can be executed according to different values ​​of the first current value; if such a process is detected... Figure 2 or Figure 3 The potential failure scenarios are shown.

[0044] If the first current value is less than or equal to the preset second downtime threshold TS, then proceed as follows: Figure 4 or Figure 7 The third verification exit step 333 is shown; this third verification exit step 333 can exit the cold start verification process of vehicle 900 and / or send a condition not met information to a preset display or prompt component; if the second standby scan step 200 detects that the vehicle 900 is in a power-off state, and the ambient temperature, power level and / or the first current value all reach their respective preset thresholds, then the third charging information of vehicle 900 is further detected. If the charging time of vehicle 900 reaches a preset time threshold and the first current value meets the fault diagnosis requirements, then the third suppression flag information is generated until the vehicle enters the next driving cycle and exits the diagnostic process.

[0045] Furthermore, the hybrid vehicle fault diagnosis method may also include a third scenario triggering step 300; the third scenario triggering step 300 may trigger the driving cycle validity flag DV of the vehicle 900 or call its first downtime comparison process when the vehicle 900 is started, thereby starting the corresponding fault detection process.

[0046] In the fourth cold start verification step 400, such as Figure 4 The reference temperature confirmation step 410 shown can obtain a reference temperature value 001 based on the temperature sequence detected at a preset location of the engine 645 and / or vehicle 900, the temperature sequence including at least 3 temperature values ​​collected from the engine 645 and / or vehicle 900.

[0047] Specifically, if there is at least one fourth interference temperature in the above temperature sequence such that the fourth absolute value of the difference between the fourth interference temperature and the reference temperature value 001 is greater than the fourth temperature difference threshold, then a cold start verification fault is reported at the detection location corresponding to the fourth interference temperature; otherwise, normal system information is reported or the cold start verification process is exited.

[0048] Furthermore, the fourth cold start verification step 400 can also obtain the first average temperature of the above temperature sequence, remove the fifth singular temperature item in the temperature sequence that has the largest deviation from the first average temperature; then obtain the second average temperature of the temperature sequence after the fifth singular temperature item has been removed, and use its second average temperature as the reference temperature value 001 for the judgment process of the fourth cold start verification step 400.

[0049] If the first current value is greater than 8 hours or greater than the second downtime threshold TS, a cold start verification process is executed. Correspondingly, as... Figure 10 The diagram also discloses a hybrid vehicle fault diagnosis device 700, which includes a first time reset unit 710, a second standby scanning unit 720, and a fourth cold start verification unit 740.

[0050] Among them: the first time reset unit 710 obtains as follows: Figures 11 to 13 The operating status information of vehicle 900 is shown. If a power-down action of vehicle 900 is detected, the first downtime must be reset to zero.

[0051] In practical applications, the second standby scanning unit 720 will correct the first downtime through the continuation process 210 or the suppression process 220 and obtain the first current value of the first downtime; its fourth cold start verification unit 740 will execute the vehicle 900's preset cold start verification process according to the first current value.

[0052] If the first current value is less than or equal to the preset second shutdown time threshold TS, the third verification exit process is initiated. This third verification exit process will end the cold start verification process of vehicle 900 and / or send a condition not met message to a preset display or prompt component. If the second standby scanning unit 720 detects that vehicle 900 is in a power-off state and the ambient temperature, battery level, and / or the first current value all reach their respective preset thresholds, the third charging information of vehicle 900 will be further detected. If the charging time of vehicle 900 reaches the preset time threshold and the first current value meets the fault diagnosis requirements, the third suppression flag information will be generated until the vehicle enters the next driving cycle and exits the diagnostic process.

[0053] Specifically, such as Figure 10 The hybrid vehicle fault diagnosis device 700 shown also includes a third scenario triggering unit 730; the third scenario triggering unit 730 can trigger the driving cycle validity flag DV of the vehicle 900 or call the comparison / discrimination process of the first downtime when the vehicle 900 is started.

[0054] The fourth cold start verification unit 740 can obtain a reference temperature value 001 based on the temperature sequence detected at a preset location of the engine 645 and / or the vehicle 900. The temperature sequence includes at least three or three temperature values ​​collected from the engine 645 and / or the vehicle 900.

[0055] If at least one of the fourth interfering temperatures in the above temperature sequence causes the fourth absolute value of the difference between the fourth interfering temperature and the reference temperature value 001 to be greater than the fourth temperature difference threshold, then a cold start verification fault is reported at the detection location corresponding to the fourth interfering temperature; otherwise, normal system information is reported or the cold start verification process is exited.

[0056] Specifically, its fourth cold start verification unit 740 can also calculate the first average temperature of the above temperature sequence.

[0057] Simultaneously, the fifth singular temperature item with the largest deviation from the first average temperature in the temperature sequence is removed; then the second average temperature of the temperature sequence after the fifth singular temperature item has been removed is obtained; at this time, the second average temperature is used as the reference temperature value 001 for the judgment process of its fourth cold start verification unit 740.

[0058] If the first current value is greater than 8 hours or greater than the second downtime threshold TS, then a preset cold start verification process is executed.

[0059] Similarly, such as Figures 11 to 13 The computer storage medium 903 shown includes a storage medium body for storing a computer program; when the computer program is executed by a microprocessor, it can implement the hybrid vehicle fault diagnosis method as described above.

[0060] The controller 901 may also implement the above process or product; specifically, the controller 901 may be equipped with a hybrid vehicle fault diagnosis device 700 as disclosed in any of the above items and / or a computer storage medium 903 of any of the above items; its processing is the same as the above method and device.

[0061] In practical applications, the inventors have found that current hybrid vehicles have a long pure electric driving range and pure electric driving scenarios are more common. After pure electric driving, when the vehicle is powered off, the downtime does not return to 0 and does not start recalculating. Only when the engine is turned off and the vehicle is powered off will the downtime return to 0.

[0062] In addition, it was found that if the vehicle is parked or driven in pure electric mode and the heater is on for a long time, the heat radiation from the heater circulation will cause the engine compartment temperature to rise after the positive temperature coefficient (PTC) component is heated, which may lead to a significant increase in engine coolant temperature, while the temperature of other sensors does not rise significantly.

[0063] If the vehicle is powered off and then restarted shortly after this time, the engine may still be idle for a long time, such as more than 10 hours, which meets the triggering conditions for cold start verification. The cold start verification diagnosis may falsely report a fault in the cold start verification of water temperature or other temperature sensors.

[0064] Furthermore, the inventors also discovered that when a hybrid vehicle is charged in a low-temperature environment or when the vehicle's heater is turned on remotely, its PTC heating may also be activated; its engine coolant temperature may also rise; and if the vehicle is restarted shortly after being powered off, it may also cause a false alarm of a cold start verification failure of the coolant temperature sensor.

[0065] The inventors further discovered that when the three-way valve or other components in the cooling system of a hybrid vehicle leak or fail to close properly, the coolant heated by the PTC may flow into the engine cooling water circuit, ultimately causing the engine water temperature to rise, and may also lead to false alarms.

[0066] like Figure 6 The diagram shows a heating air circulation structure. When there is a certain leakage in the three-way valve 622, after being heated by the PTC, its coolant flows into the engine cooling water circuit, which will cause the engine water temperature to rise.

[0067] like Figure 11 , 12 As shown in Figure 13, for hybrid vehicle 900, due to PTC heating causing abnormal rise in water temperature or other temperature sensors, after a brief power-off shutdown, it enters the next driving cycle; if the temperature detected by a certain sensor, i.e. the fourth interference temperature, deviates from the reference temperature 001 by more than the threshold when restarting, it may cause a false alarm.

[0068] The present invention improves the conditions for diagnostic entry: In the embodiment, when the vehicle 900 is powered off or when the vehicle 900 is detected to be charging, the downtime is reset to 0; then, the downtime is restarted after power-off, thus avoiding false alarms during cold start verification when restarting after a brief power-off.

[0069] Based on the above-mentioned technical improvements, the embodiments of the present invention avoid the technical problem of false alarms caused by PTC heating or leakage of three-way valves leading to cold start verification failures of water temperature sensors or other temperature sensors.

[0070] Meanwhile, under the solution of the embodiments of the present invention, maintenance misguidance and excessive sensor maintenance caused by false cold start verification faults can be effectively avoided; thus, it is conducive to improving vehicle efficiency, reducing vehicle use costs, and improving user experience.

[0071] As mentioned above, in practical applications, if there is no fault, after a calibrated downtime, such as 8 hours, if the vehicle needs to be cold-started, the temperature values ​​of all its temperature sensors, such as the coolant temperature sensor, intake air temperature sensor, and ambient temperature sensor, should be the same.

[0072] Correspondingly, if a fault exists in vehicle 900, one of its temperature sensors will exhibit excessively high or low temperature drift. This fault can then be detected through the cold start verification function, thus preventing abnormal temperatures from causing engine start failure or increased emissions.

[0073] In fact, in this embodiment of the invention, a reference temperature value RV (ReferenceValue) is determined first during cold start. If a certain temperature sensor behaves as shown in the example below compared to the reference temperature value RV... Figure 2 or Figure 3 If the displayed temperature is too low or too high, then it can be determined that the temperature sensor has a temperature drift fault.

[0074] Temperature drift faults can be categorized by direction as follows: Figure 2 The positive drift shown and as Figure 3 The negative drift is shown.

[0075] Specifically, the allowable drift deviation and fault determination thresholds for different systems can be calibrated and optimized; for cold start verification monitoring, three or more available temperature sensors are usually required to obtain basic data; thus providing reliable parameters for the verification process.

[0076] It should be noted that the above embodiments are only for more clearly illustrating the technical solution of the present invention. Those skilled in the art will understand that the implementation of the present invention is not limited to the above content. Any obvious changes, substitutions or replacements made based on the above content do not exceed the scope of the technical solution of the present invention. Other implementations will also fall within the scope of the present invention without departing from the concept of the present invention.

Claims

1. A method for diagnosing faults in hybrid vehicles, characterized in that, The system includes a first time reset step (100), a second standby scan step (200), and a fourth cold start verification step (400); wherein: the first time reset step (100) acquires the operating condition information of the vehicle (900), and if the power-down action of the vehicle (900) is detected, the first downtime is reset to zero; the second standby scan step (200) corrects the first downtime through a connection process (210) or a suppression process (220), and acquires the first current value of the first downtime; the fourth cold start verification step (400) executes the preset cold start verification process of the vehicle (900) according to the first current value; The process of connecting the two is as follows: if the vehicle is detected to be powered down, the downtime is reset to 0, the downtime is calculated, and the downtime is corrected. The process of suppressing the vehicle is as follows: if the second standby scan step detects that the vehicle is powered down, and the ambient temperature, battery level, and / or the first current value all reach their respective preset thresholds, then the third charging information of the vehicle is further detected. If the charging time of the vehicle reaches the preset time threshold and the first current value meets the fault diagnosis requirements, then the third suppression flag information is generated until the vehicle enters the next driving cycle and exits the diagnostic process.

2. The hybrid vehicle fault diagnosis method as described in claim 1, wherein: If the first current value is less than or equal to the preset second shutdown time threshold TS, then proceed to the third verification exit step (333); the third verification exit step (333) exits the cold start verification process of the vehicle (900) and / or sends a condition not met information to a preset display or prompt component. If the second standby scan step (200) detects that the vehicle (900) is in a power-off state, and the ambient temperature, power level and / or the first current value all reach their respective preset thresholds, then further detect the third charging information of the vehicle (900). If the charging time of the vehicle (900) reaches the preset time threshold and the first current value meets the fault diagnosis requirements, then generate the third suppression flag information until the vehicle enters the next driving cycle and exits the diagnosis process.

3. The hybrid vehicle fault diagnosis method as described in claim 1 or 2 further includes a third scenario triggering step (300); the third scenario triggering step (300) triggers the driving cycle validity flag DV of the vehicle (900) or calls the comparison process of the first downtime when the vehicle (900) is started.

4. The hybrid vehicle fault diagnosis method as described in claim 3, wherein: The fourth cold start verification step (400) calculates a reference temperature value (001) based on the temperature sequence detected at a preset location of the engine (645) and / or the vehicle (900). The temperature sequence includes at least three temperature values ​​collected from the engine (645) and / or the vehicle (900). If there is at least one fourth interference temperature in the temperature sequence such that the fourth absolute value of the difference between the fourth interference temperature and the reference temperature value (001) is greater than the fourth temperature difference threshold, a cold start verification fault is reported at the detection location corresponding to the fourth interference temperature. Otherwise, a normal system information is reported or the cold start verification process is exited.

5. The hybrid vehicle fault diagnosis method as described in claim 4, wherein: The fourth cold start verification step (400) further obtains the first average temperature of the temperature sequence, removes the fifth singular temperature item in the temperature sequence that has the largest deviation from the first average temperature, obtains the second average temperature of the temperature sequence after the fifth singular temperature item has been removed, and uses the second average temperature as the reference temperature value (001) for the judgment process of the fourth cold start verification step (400).

6. The hybrid vehicle fault diagnosis method as described in any one of claims 2, 4, or 5, wherein: If the first current value is greater than 8 hours or greater than the second downtime threshold TS, then the cold start verification process is executed.

7. A hybrid vehicle fault diagnosis device (700), comprising a first time reset unit (710), a second standby scanning unit (720), and a fourth cold start verification unit (740); wherein: The first time reset unit (710) acquires the operating condition information of the vehicle (900). If the power-down action of the vehicle (900) is detected, the first downtime is reset to zero. The second standby scan unit (720) corrects the first downtime through a connection process (210) or a suppression process (220) and acquires the first current value of the first downtime. The fourth cold start verification unit (740) executes the preset cold start verification process of the vehicle (900) according to the first current value. The process of connecting the two is as follows: if the vehicle is detected to be powered down, the downtime is reset to 0, the downtime is calculated, and the downtime is corrected. The process of suppressing the vehicle is as follows: if the second standby scan step detects that the vehicle is powered down, and the ambient temperature, battery level, and / or the first current value all reach their respective preset thresholds, then the third charging information of the vehicle is further detected. If the charging time of the vehicle reaches the preset time threshold and the first current value meets the fault diagnosis requirements, then the third suppression flag information is generated until the vehicle enters the next driving cycle and exits the diagnostic process.

8. The hybrid vehicle fault diagnosis device (700) as described in claim 7, wherein: If the first current value is less than or equal to the preset second downtime threshold TS, then proceed to the third verification exit process; The third verification exit process ends the cold start verification process of the vehicle (900) and / or sends a condition not met message to a preset display or prompt component; if the second standby scanning unit (720) detects that the vehicle (900) is in a power-off state, and the ambient temperature, power level and / or the first current value all reach their respective preset thresholds, then the third charging information of the vehicle (900) is further detected; if the charging time of the vehicle (900) reaches a preset time threshold and the first current value meets the fault diagnosis requirements, then the third suppression flag information is generated until the vehicle enters the next driving cycle and exits the diagnostic process.

9. The hybrid vehicle fault diagnosis device (700) as described in claim 7 or 8 further includes a third scenario triggering unit (730); the third scenario triggering unit (730) triggers the driving cycle validity flag DV of the vehicle (900) or invokes the comparison / discrimination process of the first downtime when the vehicle (900) is started.

10. The hybrid vehicle fault diagnosis device (700) as described in claim 9, wherein: The fourth cold start verification unit (740) calculates a reference temperature value (001) based on the temperature sequence detected at a preset location of the engine (645) and / or the vehicle (900). The temperature sequence includes at least three temperature values ​​collected from the engine (645) and / or the vehicle (900). If there is at least one fourth interference temperature in the temperature sequence such that the fourth absolute value of the difference between the fourth interference temperature and the reference temperature value (001) is greater than the fourth temperature difference threshold, a cold start verification fault is reported at the detection location corresponding to the fourth interference temperature. Otherwise, a normal system information is reported or the cold start verification process is exited.

11. The hybrid vehicle fault diagnosis device (700) as described in claim 10, wherein: The fourth cold start verification unit (740) also obtains the first average temperature of the temperature sequence and removes the fifth singular temperature item in the temperature sequence that has the largest deviation from the first average temperature. The second average temperature of the temperature sequence after the fifth singular temperature item has been removed is obtained, and the second average temperature is used as the reference temperature value (001) for the judgment process of the fourth cold start verification unit (740).

12. The hybrid vehicle fault diagnosis device (700) as described in any one of claims 8, 10, or 11, wherein: If the first current value is greater than 8 hours or greater than the second downtime threshold TS, then the cold start verification process is executed.

13. A computer storage medium (903) comprising a storage medium body for storing a computer program; wherein the computer program, when executed by a microprocessor, implements the hybrid vehicle fault diagnosis method as described in any one of claims 1 to 6.

14. A controller (901) comprising a hybrid vehicle fault diagnosis device (700) as claimed in any one of claims 7 to 12 and / or a computer storage medium (903) as claimed in claim 13.

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