Power module fault diagnosis and treatment method, system, vehicle and electronic equipment

Abstract

The present invention relates to a method, system, vehicle and electronic device for diagnosing and processing power module faults. The method for diagnosing and processing power module faults comprises: when a power module fault is detected, identifying whether the DCDC jumps within a preset time before the fault, if not, executing: performing a reset judgment based on the fault type, reporting a fault recoverable flag if the conditions are met, and reporting an unrecoverable flag if the conditions are not met; performing a reset based on the reported flag and the motor system working mode; if yes, executing: timing from identification to fault start, identifying the DCDC output power when the DCDC jumps to determine the pull-down time, combining the reset time and the response time to determine the reset delay time, and executing the reset operation. The present invention also provides a system for diagnosing and processing power module faults. The present invention also provides an electronic device and a vehicle. The present invention reduces the risk of power interruption in electric vehicles due to false alarms of power module faults.

Description

Technical Field

[0001] The present invention relates to the technical field of electric drive systems, and in particular to a method, system, vehicle and electronic equipment for diagnosing and processing power module faults. Background Art

[0002] With the rapid development of the automotive industry, new energy vehicles have become a true mainstream market. However, while offering convenience and environmental benefits, new energy vehicles also face numerous challenges. As a core component of new energy vehicles, the power module in the electric drive system plays a crucial role, converting DC power into controllable AC power to ensure stable operation of the drive motor. However, when a power module in the motor controller fails, vehicle operation is severely impacted, manifesting as power outages or inability to start, severely affecting the user's daily experience.

[0003] Power module failures can arise from a variety of factors, with low supply voltage being a common factor. In new energy vehicle power systems, small batteries serve as a crucial auxiliary power source, and their charge status is directly related to the proper functioning of the power module. When the small battery charge is low, the supply voltage drops, potentially causing power module failure. In such cases, reporting a power module failure is reasonable.

[0004] However, low supply voltage isn't the only cause of power module failure. In practical applications, the operating status of a key component, the DC-DC converter, must also be considered. As the crucial bridge connecting the high-voltage and low-voltage batteries, the DC-DC converter's performance directly impacts the stability of the entire power system. If the DC-DC converter fails or malfunctions (due to a fault within the converter itself, switching between AC charging modes, DC charging insulation testing, or normal power-off), it can cause a momentary drop in the small battery voltage, triggering a false alarm from the power module. This false alarm not only confuses and annoys users but also places an additional burden on fault analysts. Furthermore, with the increasing number of new energy vehicles, the operating environments and conditions are becoming more complex and variable, leading to an increase in false alarms. This undoubtedly poses a greater challenge to the stable operation of the DC-DC converter.

[0005] Therefore, accurately judging the failure problems of power modules and taking effective measures to solve and prevent them are the key to ensuring the sustainable and stable development of new energy vehicles.

[0006] CN117996688A discloses an active short-circuit control method and device, which includes: determining an electrical signal detected by a vehicle's fault module or motor controller; determining whether the conditions for the motor controller to perform active short-circuit control are met based on the electrical signal detected by the vehicle's fault module or motor controller, and the active short-circuit trigger threshold of the electrical signal or motor speed; performing active short-circuit control when the conditions for the motor controller to perform active short-circuit control are met; determining whether the conditions for exiting active short-circuit control are met based on the vehicle's fault module, the active short-circuit exit threshold of the electrical signal or motor speed, and the current speed of the motor; exiting active short-circuit control when the conditions for the motor controller to exit active short-circuit control are met. Although this method can effectively reduce the damage to controller components caused by power module failure, it cannot reduce the risk of power interruption. Summary of the Invention

[0007] In view of this, the purpose of the present invention is to provide a method, system, vehicle and electronic equipment for diagnosing and handling power module faults, so as to reduce the risk of electric vehicle power interruption caused by false alarm of power module faults and improve the accuracy of power module fault diagnosis.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0009] The diagnosis and treatment method of power module failure includes the following steps:

[0010] S1. When a power module fault is detected, identify whether the DCDC working mode changes within the first preset time before the fault. If no change occurs, execute S2; if a change occurs, execute S3.

[0011] S2. Perform fault reset judgment based on the fault type. If the reset conditions are met, the fault is reported as recoverable. If the reset conditions are not met, the fault is reported as unrecoverable. Perform the corresponding reset operation based on the reported flag and the working mode of the motor system.

[0012] S3, start timing from the time the power module fault is identified, and identify the DCDC output power P when the DCDC working mode changes a , determine the small battery voltage drop time t according to the DCDC output power a , and combined with the obtained power module reset time t b The response time t from the triggering to the recognition of the power module fault c , determine the reset delay time t of the power module fault i , when the timing time is greater than or equal to the reset delay time t i When the power module is reset,

[0013] According to the above technical means, first, by identifying whether the DCDC operating mode jump occurs before the fault, it effectively distinguishes between transient faults caused by DCDC operating mode switching and true power module faults, thereby greatly reducing the risk of electric vehicle power interruption caused by false alarms due to transient DCDC non-operation. Second, by adopting a step-by-step, multi-condition fault diagnosis method, a comprehensive judgment is made based on factors such as fault type, DCDC operating mode, and DCDC output power, thereby improving the accuracy and reliability of power module fault diagnosis. Third, by determining the power module reset delay time based on the DCDC output power, the success rate of power module reset is effectively improved and the risk of hardware damage during the power module reset process is reduced. Fourth, by executing the corresponding reset operation based on the reported flag bit and the operating mode of the motor system, and executing the power module reset operation after the reset delay time is determined, an intelligent and automated fault handling process is implemented, improving processing efficiency and safety. Finally, by reducing power interruptions caused by false alarms and accurately and promptly handling faults, the reliability and stability of electric vehicles are improved, thereby enhancing user experience and satisfaction.

[0014] The power module fault diagnosis and treatment method of the present invention is applied to a vehicle's electric drive system, which includes a motor, a motor controller, and a reducer. The motor controller includes a power module, which converts DC power from a power battery into AC power to control motor operation. The DC-DC converter converts the high-voltage DC power from the power battery into 12V power for a small battery.

[0015] Preferably, in S2, performing corresponding reset operations according to the reported flag bit and the working mode of the motor system specifically includes:

[0016] When the fault recoverable flag is received and the motor system is in non-fault mode, the application layer software sends a power module reset request, and the bottom layer software immediately performs the power module reset operation;

[0017] When a fault unrecoverable flag is received and / or the motor system is in fault mode, the power module reset operation is not performed.

[0018] Preferably, when a fault unrecoverable flag is received and / or the motor system is in a fault mode, the power module reset operation is not performed, including the following three situations:

[0019] 1) When the fault unrecoverable flag is received and the motor system is in fault mode, the power module reset operation is not performed;

[0020] 2) When the fault recoverable flag is received and the motor system is in fault mode, the power module reset operation is not performed;

[0021] 3) When the fault unrecoverable flag is received and the motor system is in non-fault mode, the power module reset operation is not performed.

[0022] Preferably, in said S2, the bottom layer software performs a fault reset judgment according to the fault type, and if the reset condition is met, the fault recoverable flag is reported; if the reset condition is not met, the fault unrecoverable flag is reported;

[0023] The fault type includes at least one of: GD3100 high-voltage side negative pressure fault, GD3100 high-voltage side VCC overvoltage, GD3100 overtemperature, IGBT VCR fault and GD3100 high-voltage side PWM output follower fault;

[0024] The reset condition is that the fault type is not one or both of the IGBT VCR fault and the GD3100 high-voltage side PWM output following fault.

[0025] Preferably, in S3, the power P is outputted by DCDC. a The time t when the small battery voltage is pulled down a The corresponding relationship is used to obtain the small battery voltage drop time t a .

[0026] Preferably, in said S3, the power module reset time t is obtained by looking up the power module chip manual. b The response time t from the triggering to the recognition of the power module fault c .

[0027] Preferably, in said S3, the reset delay time t of the power module fault i =t a -t b -t c .

[0028] Among them, the DCDC output power P a The time t when the small battery voltage is pulled down a The corresponding relationship is expressed in t a The power module fault will continue to be triggered within t, which should be directly used as the reset delay time. b It takes a certain amount of time from the power module fault triggering to the application layer recognition. c Therefore, the reset delay time t i Correction is performed, and the reset delay time of the power module fault after correction is t i =t a -t b -t c .

[0029] Preferably, the DCDC output power Pa The time t when the small battery voltage is pulled down a The corresponding relationship is obtained through bench test.

[0030] Preferably, the bench test method comprises the following steps:

[0031] a. Based on the DCDC non-working bench simulation test, control the DCDC to be in working mode, adjust the low-voltage load power to P1, and turn off the DCDC output after stable operation for the second preset time. The small battery voltage is instantly reduced to the power module fault trigger threshold V when the DCDC is not working. d and below until it recovers to V d The above pull-down time t1;

[0032] b. Adjust the low voltage load power to P n , execute step a to obtain the corresponding low-voltage load power pull-down time t n , where n≥2;

[0033] c. Through data fitting, we can get the curve of pull-down time versus low-voltage load power, i.e. DCDC output power P a The time t when the small battery voltage is pulled down a The corresponding relationship.

[0034] The present invention also provides a system for implementing the power module fault diagnosis and processing method of the present invention, comprising:

[0035] Fault monitoring module, used to monitor the working status of DCDC and trigger subsequent processing when a power module fault is detected;

[0036] Working mode jump identification module: used to identify whether the DCDC working mode jumps within the first preset time before the fault when a power module fault is detected. If no jump occurs, the first processing path is triggered; if a jump occurs, the second processing path is triggered;

[0037] The first processing path includes:

[0038] The fault reset judgment module is used to judge the fault reset according to the fault type. If the reset condition is met, the fault is reported as recoverable, otherwise the fault is reported as unrecoverable.

[0039] A reset operation execution module, used to execute corresponding reset operations according to the reported flag bit and the working mode of the motor system;

[0040] The second processing path includes:

[0041] The timing and power detection module starts timing when a power module fault is detected, and identifies the DCDC output power when the DCDC working mode changes.

[0042] Time calculation module, used to calculate the output power P according to the DCDC a Determine the time t for the small battery voltage to drop a , and combined with the obtained power module reset time t b The response time t from the triggering to the recognition of the power module fault c , determine the reset delay time t of the power module fault i ;

[0043] Delay reset module, used to reset the timer when the timing time is greater than or equal to the reset delay time t i When the power module is reset,

[0044] Preferably, the time calculation module includes:

[0045] Storage submodule, used to store DCDC output power P a The time t when the small battery voltage is pulled down a The corresponding relationship and power module chip manual;

[0046] The time calculation submodule is used to calculate the DCDC output power P a The time t when the small battery voltage is pulled down a The corresponding relationship is used to obtain the small battery voltage drop time t a , and combined with the obtained power module reset time t b The response time t from the power module fault being triggered to being recognized by the application layer software c , calculate and determine the reset delay time t of the power module fault i ; where t i =t a -t b -t c .

[0047] The present invention also provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the power module fault diagnosis and processing method described in the present invention when executing the computer program.

[0048] The present invention also provides a vehicle, comprising the electronic device of the present invention.

[0049] Beneficial effects of the present invention:

[0050] The power module fault diagnosis and treatment method of the present invention, first, by identifying whether a DCDC operating mode jump occurs before the fault, effectively distinguishes between transient faults caused by operating mode switching and true power module faults, thereby greatly reducing the risk of electric vehicle power interruption caused by false alarms due to transient DCDC non-operation. Specifically, by adopting a step-by-step, multi-condition fault diagnosis method, a comprehensive judgment is made based on factors such as fault type, DCDC operating mode, and DCDC output power, thereby improving the accuracy and reliability of power module fault diagnosis. Third, by determining the power module reset delay time based on the DCDC output power, the success rate of power module reset is effectively improved and the risk of hardware damage during the power module reset process is reduced. Fourth, by executing the corresponding reset operation based on the reported flag bit and the operating mode of the motor system, and executing the power module reset operation after the reset delay time is determined, an intelligent and automated fault handling process is implemented, improving processing efficiency and safety. Finally, by reducing power interruptions caused by false alarms and accurately and promptly handling faults, the reliability and stability of the electric vehicle are improved, thereby enhancing the user experience and satisfaction. The method has promotional and application value in the field of electric drive system technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 A flowchart of a method for diagnosing and handling a power module fault according to the present invention;

[0052] Figure 2 This is a structural diagram of the small battery voltage being instantly lowered;

[0053] Figure 3 It is a graph showing the pull-down time versus low voltage load power;

[0054] Figure 4 The figure is a schematic structural diagram of a system for implementing the method for diagnosing and processing power module faults of the present invention. DETAILED DESCRIPTION

[0055] The following describes the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art will readily appreciate the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the various details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are intended only to illustrate the present invention and are not intended to limit the scope of protection of the present invention.

[0056] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be changed arbitrarily, and the component layout may also be more complex.

[0057] In the following description, numerous details are discussed to provide a more thorough explanation of the embodiments of the present application. However, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details.

[0058] The present invention aims to disclose a method, system, vehicle, and electronic device for diagnosing and handling power module faults, thereby reducing the risk of electric vehicle power interruption caused by false alarms of power module faults and improving the accuracy of power module fault diagnosis.

[0059] Among them, such as Figures 1 to 3 As shown, the method for diagnosing and handling power module failures includes the following steps:

[0060] S1. Real-time monitoring of the DCDC working status. When the driver chip detects a power module fault, it identifies whether the DCDC working mode changes within the first preset time before the fault. If no change occurs, execute S2. If a change occurs, execute S3.

[0061] S2. The bottom layer software determines the fault reset based on the fault type. If the reset conditions are met, the fault recoverable flag is reported (i.e., 1). If the reset conditions are not met, the fault unrecoverable flag is reported (i.e., 0). The application layer software performs the corresponding reset operation based on the reported flag and the operating mode of the motor system.

[0062] S3, start timing from the moment the application layer software identifies a power module fault, and identify the DCDC output power P when the DCDC working mode changes a , according to the DCDC output power P a Determine the time t for the small battery voltage to drop a , and combined with the obtained power module reset time t b The response time t from the power module fault being triggered to being recognized by the application layer software c , determine the reset delay time t of the power module fault i , when the timing time is greater than or equal to the reset delay time t i When the power module is reset,

[0063] The above-mentioned diagnosis and treatment methods are designed to address the phenomenon that when the DCDC stops working, the small battery voltage is pulled down, resulting in a false alarm of power module failure. This improves the accuracy of power module fault diagnosis and reduces the risk of vehicle power interruption.

[0064] The power module fault diagnosis and treatment method described above is applicable to the vehicle's electric drive system, which includes a motor, motor controller, and reducer. The motor controller includes a power module, which converts DC power from the power battery into AC power to control the motor. The DC-DC converter converts the high-voltage DC power from the power battery into 12V to power a small battery.

[0065] Whether the DCDC working mode changes includes normal switching or instantaneous change of the DCDC working mode.

[0066] In some embodiments, in S2, a corresponding reset operation is performed according to the reported flag bit and the working mode of the motor system, specifically including:

[0067] When the fault recoverable flag (i.e. 1) is received and the motor system is in non-fault mode, the application layer software sends a power module reset request, and the bottom layer software immediately performs the power module reset operation;

[0068] When the fault unrecoverable flag bit (ie, 0) is received and / or the motor system is in fault mode, the power module reset operation is not performed.

[0069] Exemplarily, when a fault unrecoverable flag bit (i.e., 0) is received and / or the motor system is in a fault mode, the power module reset operation is not performed, including the following three situations:

[0070] 1) When the fault unrecoverable flag (i.e. 0) is received and the motor system is in fault mode, the power module reset operation is not performed;

[0071] 2) When the fault recoverable flag (i.e. 1) is received and the motor system is in fault mode, the power module reset operation is not performed;

[0072] 3) When the fault unrecoverable flag (i.e. 0) is received and the motor system is in non-fault mode, the power module reset operation is not performed.

[0073] In some embodiments, in S2, the bottom layer software performs a fault reset judgment based on the fault type. If the reset condition is met, the fault recoverable flag bit (i.e., 1) is reported; if the reset condition is not met, the fault unrecoverable flag bit (i.e., 0) is reported.

[0074] Among them, the fault types include: at least one of the following: GD3100 high-voltage side negative pressure fault, GD3100 high-voltage side VCC overvoltage, GD3100 overtemperature, IGBT VCR fault and GD3100 high-voltage side PWM output follower fault;

[0075] The reset condition is met if the fault type is not one or both of the IGBT VCR fault and the GD3100 high-voltage side PWM output following fault.

[0076] In some embodiments, in S3, the DCDC output power P a The time t when the small battery voltage is pulled down a The corresponding relationship is used to obtain the time t when the small battery voltage is pulled down when the DCDC is not working. a .

[0077] The corresponding relationship between the DCDC output power Pa and the small battery voltage lowering time ta is a corresponding relationship table of the DCDC output power Pa and the small battery voltage lowering time ta.

[0078] In some embodiments, in S3, the power module reset time t is obtained by looking up the power module chip manual. b The response time t from the triggering to the recognition of the power module fault c .

[0079] In some embodiments, in S3, the reset delay time t i =t a -t b -t c .

[0080] Among them, the DCDC output power P a The time t when the small battery voltage is pulled down a The corresponding relationship is expressed in t a The power module fault will continue to be triggered within t, which should be directly used as the reset delay time. b It takes a certain amount of time from the power module fault triggering to the application layer recognition. c Therefore, the reset delay time t i Correction is performed, and the reset delay time of the power module fault after correction is t i =t a -t b -t c .

[0081] In some embodiments, the DCDC output power P a The time t when the small battery voltage is pulled down aThe corresponding relationship between the DCDC output power Pa and the small battery voltage drop time ta is obtained through bench testing.

[0082] In some embodiments, the bench test method comprises the following steps:

[0083] a. Based on the DCDC non-working bench simulation test, control the DCDC to be in working mode, adjust the low-voltage load power to P1, and turn off the DCDC output after stable operation for the second preset time. The small battery voltage is instantly reduced to the power module fault trigger threshold V when the DCDC is not working. d and below until it recovers to V d The above pull-down time t1;

[0084] b. Adjust the low voltage load power to P n , execute step a to get the pull-down time t n With low voltage load power P n The curve of change, where n≥2, P1 and P n Not equal;

[0085] c) By fitting the polynomial data, a regular curve of low-voltage load power versus pull-down time is obtained, that is, the corresponding relationship between the DCDC output power Pa and the small battery voltage pull-down time ta.

[0086] An exemplary method for diagnosing and handling a power module fault includes the following steps:

[0087] S10, real-time monitoring of the working status of the DCDC. When the application layer software detects a power module fault and identifies that the working mode of the DCDC is switched from high-voltage activation to standby mode within a first preset time before the fault, S30 is executed;

[0088] S30, start timing from the time when the application layer software recognizes the power module failure, and identify the DCDC output power P when the DCDC working mode jumps a , according to the DCDC output power P a Query the DCDC output power P a The time t when the small battery voltage is pulled down a The corresponding relationship table shows the time t when the small battery voltage is lowered a , and combined with the obtained power module reset time t b The response time t from the power module fault being triggered to being recognized by the application layer software c , determine the reset delay time t of the power module fault i , t i =t a -t b -t c, when the timing time is greater than or equal to the reset delay time t i When the power module is reset,

[0089] like Figure 4 As shown, a system for implementing the method for diagnosing and handling a power module fault in any of the above embodiments includes:

[0090] Fault monitoring module, used to monitor the working status of DCDC and trigger subsequent processing when a power module fault is detected;

[0091] Working mode jump identification module: used to identify whether the DCDC working mode jumps within the first preset time before the fault when a power module fault is detected. If no jump occurs, the first processing path is triggered; if a jump occurs, the second processing path is triggered;

[0092] The first processing path includes:

[0093] The fault reset judgment module is used to judge the fault reset according to the fault type. If the reset condition is met, the fault recovery flag bit is reported (i.e. 1); otherwise, the fault non-recoverable flag bit is reported (i.e. 0);

[0094] A reset operation execution module, used to execute corresponding reset operations according to the reported flag bit and the working mode of the motor system;

[0095] The second processing path includes:

[0096] The timing and power detection module starts timing when the application layer software identifies a power module fault and identifies the DCDC output power when the DCDC operating mode changes.

[0097] Time calculation module, used to calculate the output power P according to the DCDC a Determine the time t for the small battery voltage to drop a , and combined with the obtained power module reset time t b The response time t from the power module fault being triggered to being recognized by the application layer software c , determine the reset delay time t of the power module fault i ;

[0098] Delay reset module, used to reset the timer when the timing time is greater than or equal to the reset delay time t i When the power module is reset,

[0099] In some embodiments, the time calculation module includes:

[0100] Storage submodule, used to store DCDC output power P a The time t when the small battery voltage is pulled downa The corresponding relationship and power module chip manual;

[0101] The time calculation submodule is used to check the DCDC output power P a The time t when the small battery voltage is pulled down a The corresponding relationship is used to obtain the small battery voltage drop time t a , and combined with the obtained power module reset time t b The response time t from the power module fault being triggered to being recognized by the application layer software c , calculate and determine the reset delay time t of the power module fault i ; where t i =t a -t b -t c .

[0102] An electronic device includes a memory and a processor. The memory stores a computer program. When the processor executes the computer program, the steps of the power module fault diagnosis and processing method in any of the above embodiments are implemented.

[0103] A vehicle comprises the electronic device according to any one of the above embodiments.

[0104] In summary, the power module fault diagnosis and treatment method of the present invention, first, by identifying whether the DCDC operating mode jump occurs before the fault, effectively distinguishes between transient faults caused by operating mode switching and true power module faults, thereby greatly reducing the risk of electric vehicle power interruption caused by false alarms due to transient DCDC non-operation; second, by adopting a step-by-step, multi-condition fault diagnosis method, a comprehensive judgment is made based on factors such as fault type, DCDC operating mode, and DCDC output power, thereby improving the accuracy and reliability of power module fault diagnosis; third, by determining the power module reset delay time based on the DCDC output power, the success rate of power module reset is effectively improved and the risk of hardware damage during the power module reset process is reduced; fourth, by executing the corresponding reset operation according to the reported flag bit and the operating mode of the motor system, and executing the power module reset operation after determining the reset delay time, an intelligent and automated fault handling process is implemented, improving processing efficiency and safety; finally, by reducing power interruptions caused by false alarms and accurately and promptly handling faults, the reliability and stability of electric vehicles are improved, thereby improving user experience and satisfaction, and having promotion and application value in the field of electric drive system technology.

[0105] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit this application. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, any equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concepts disclosed in this application shall be encompassed by the claims of this application.

Claims

1. A method for diagnosing and handling power module failures, characterized in that: The following steps are involved: S1. When a power module fault is detected, identify whether the DCDC operating mode changes within the first preset time before the fault. If no change occurs, execute S2; if a change occurs, execute S3. S2. Perform fault reset judgment based on the fault type. If the reset conditions are met, the fault is reported as recoverable. If the reset conditions are not met, the fault is reported as unrecoverable. Perform corresponding reset operations according to the reported flag and the working mode of the motor system; S3, start timing from the time the power module fault is identified, and identify the DCDC output power P when the DCDC working mode changes a , according to the DCDC output power P a The time t when the small battery voltage is pulled down a The corresponding relationship is used to obtain the small battery voltage drop time t a , and combined with the obtained power module reset time t b The response time t from the triggering to the recognition of the power module fault c , determine the reset delay time t of the power module fault i , when the timing time is greater than or equal to the reset delay time t i When the power module is reset, The DCDC output power P a The time t when the small battery voltage is pulled down a The corresponding relationship is obtained through bench test; The bench test method comprises the following steps: a. Based on the DCDC non-working bench simulation test, control the DCDC to be in working mode, adjust the low-voltage load power to P1, and turn off the DCDC output after stable operation for the second preset time. The small battery voltage is instantly reduced to the power module fault trigger threshold V when the DCDC is not working. d and below until it recovers to V d The above pull-down time t1; b. Adjust the low voltage load power to P n , execute step a to obtain the corresponding low-voltage load power pull-down time t n , where n≥2; c. Through data fitting, we can get the curve of pull-down time versus low-voltage load power, i.e. DCDC output power P a The time t when the small battery voltage is pulled down a The corresponding relationship.

2. The method for diagnosing and handling power module failure according to claim 1, wherein: In S2, a corresponding reset operation is performed according to the reported flag bit and the working mode of the motor system, specifically including: When the fault recoverable flag is received and the motor system is in non-fault mode, the application layer software sends a power module reset request, and the bottom layer software immediately performs the power module reset operation; When a fault unrecoverable flag is received and / or the motor system is in fault mode, the power module reset operation is not performed.

3. The method for diagnosing and handling power module failure according to claim 1, characterized in that: In S2, the bottom layer software performs a fault reset judgment based on the fault type. If the reset condition is met, the fault is reported as a recoverable flag. If the reset condition is not met, the fault is reported as an unrecoverable flag. The fault type includes at least one of: GD3100 high-voltage side negative pressure fault, GD3100 high-voltage side VCC overvoltage, GD3100 overtemperature, IGBTVCR fault and GD3100 high-voltage side PWM output follower fault; The reset condition is that the fault type is not one or both of the IGBT VCR fault and the GD3100 high-voltage side PWM output following fault.

4. The method for diagnosing and handling power module failure according to claim 1, wherein: In S3, the power module reset time t is obtained by checking the power module chip manual. b The response time t from the triggering to the recognition of the power module fault c ; And / or, in said S3, the reset delay time t of the power module fault i =t a -t b -t c .

5. A system for implementing the method for diagnosing and processing a power module fault according to any one of claims 1 to 4, characterized in that: include: Fault monitoring module, used to monitor the working status of DCDC and trigger subsequent processing when a power module fault is detected; Working mode jump identification module: used to identify whether the DCDC working mode jumps within the first preset time before the fault when a power module fault is detected. If no jump occurs, the first processing path is triggered; if a jump occurs, the second processing path is triggered; The first processing path includes: The fault reset judgment module is used to judge the fault reset according to the fault type. If the reset condition is met, the fault is reported as recoverable, otherwise the fault is reported as unrecoverable. A reset operation execution module, used to execute corresponding reset operations according to the reported flag bit and the working mode of the motor system; The second processing path includes: The timing and power detection module starts timing when a power module fault is detected, and identifies the DCDC output power when the DCDC working mode changes. Time calculation module, used to calculate the output power P according to the DCDC a Determine the time t for the small battery voltage to drop a , and combined with the obtained power module reset time t b The response time t from the triggering to the recognition of the power module fault c , determine the reset delay time t of the power module fault i ; Delay reset module, used to reset the timer when the timing time is greater than or equal to the reset delay time t i When the power module is reset, 6. The system according to claim 5, characterized in that The time calculation module includes: Storage submodule, used to store DCDC output power P a The time t when the small battery voltage is pulled down a The corresponding relationship and power module chip manual; The time calculation submodule is used to calculate the DCDC output power P a The time t when the small battery voltage is pulled down a The corresponding relationship is used to obtain the small battery voltage drop time t a , and combined with the obtained power module reset time t b The response time t from the power module fault being triggered to being recognized by the application layer software c , calculate and determine the reset delay time t of the power module fault i ; where t i =t a -t b -t c .

7. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method for diagnosing and processing a power module fault according to any one of claims 1 to 4 are implemented.

8. A vehicle, characterized in that: The vehicle includes the electronic device according to claim 7.

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