CN-122009107-A - Unexpected electric brake fault control method and related equipment

CN122009107ACN 122009107 ACN122009107 ACN 122009107ACN-122009107-A

Abstract

The invention discloses an unexpected electric brake fault control method and related equipment, which comprise the steps of determining a risk level and a fault cause corresponding to unexpected electric brake faults of a vehicle, wherein the unexpected electric brake faults are used for representing unexpected deceleration of the vehicle beyond a quantified safety boundary caused by abnormal electric brake functions, the quantified safety boundary is a threshold value of unexpected deceleration and duration time related to each risk level, the risk level is determined through hazard analysis and risk assessment, the fault cause is obtained through architecture-level fault tree analysis in a retrospective mode, and safety requirements are determined based on the risk level and the fault cause, wherein the safety requirements comprise control of generation of an electric brake request, monitoring of execution of the electric brake request and management and degradation of the electric brake request when the unexpected electric brake faults occur, and the actual electric brake force of the vehicle is configured based on the safety requirements so as to limit the unexpected electric brake force to be within the quantified safety boundary.

Inventors

CHEN XINYU
ZHOU ZHUANG
Lou Shixuan
LIN WEI

Assignees

岚图汽车科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260316

Claims (10)

1. A method of unexpected electric brake failure control, comprising: Determining a risk level and a fault cause corresponding to an unexpected electric brake fault of the vehicle, wherein the unexpected electric brake fault is used for representing unexpected deceleration of the vehicle, which is generated due to abnormal electric brake function and exceeds a quantified safety boundary, the quantified safety boundary is a threshold value of unexpected deceleration and duration time related to each risk level, the risk level is determined based on hazard analysis and risk assessment, and the fault cause is obtained through tracing through architecture-level fault tree analysis; Determining a safety requirement based on the risk level and the failure cause, wherein the safety requirement comprises generation control of an electric brake request, execution process monitoring of the electric brake request and management and degradation when unexpected electric brake failure occurs; the actual executed electric braking force of the vehicle is configured based on the safety demand to limit the unintended electric braking force to within a quantified safety margin.
2. The method of claim 1, wherein determining a risk level and a cause of the fault corresponding to the unexpected electric brake fault of the vehicle comprises: Acquiring all unexpected electric braking faults generated by abnormal functions of a vehicle in a braking energy recovery scene, a sliding energy recovery scene and a hydraulic braking fluid replacement scene; And respectively grading all the unexpected electric brake faults based on preset standards in a typical operation scene in three dimensions of event severity, exposure probability and driver controllability to determine a risk level corresponding to each unexpected electric brake fault, wherein the risk level is related to the safety integrity level of the automobile.
3. The method of claim 1, wherein determining a risk level and a cause of the fault corresponding to the unexpected electric brake fault of the vehicle comprises: And taking the unexpected electric brake fault as a top event, and performing gradual decomposition from top to bottom on the whole vehicle architecture level so as to trace back the fault reasons from the driving control system, the brake control system, the driving motor system and the power battery management system.
4. The method as recited in claim 1, further comprising: Inputting the deceleration and the duration of the unexpected electric braking fault of the front vehicle to a preset kinematic analysis model so as to output the collision relative speed and collision avoidance possibility of the rear vehicle, wherein the preset kinematic analysis model is used for simulating the unexpected electric braking fault of the front vehicle and the following braking process of the rear vehicle; Determining an accident severity based on the collision relative velocity; determining a driver controllability based on the collision avoidance possibility; quantitative safety boundaries corresponding to different risk levels are determined based on accident severity and driver controllability.
5. The method of claim 1, wherein the determining a safety requirement based on the risk level and a cause of the fault comprises: analyzing a whole vehicle safety target based on the risk level and the fault reason; Technical specifications, security measures, and security mechanisms are defined for each security target to determine the security requirements.
6. The method of claim 1, wherein the safety requirements include a vehicle total electric braking force monitoring and limiting requirement, a braking energy recovery request and execution management requirement, a coasting energy recovery torque monitoring requirement, a braking fluid replacement request and execution monitoring requirement, a fault diagnosis and grading degradation strategy requirement, a motor actual torque feedback accuracy management requirement, and a key signal reliability guarantee requirement.
7. The method of claim 6, wherein configuring the actual executed electric braking force of the vehicle based on the safety demand to limit the unexpected electric braking force to be within a quantified safety margin comprises: configuring the total electric brake force monitoring and limiting demand, the brake energy recovery execution monitoring demand, the coasting energy recovery torque monitoring demand, the fault diagnosis and derating strategy demand to the drive control system; Configuring the braking energy recovery request management and control requirement, the braking fluid replacement request and the execution monitoring requirement to the braking control system; Configuring the actual torque feedback precision control requirement to the driving motor system; And configuring parts related to respective systems in the key signal reliability guarantee requirement to the driving control system, the braking control system and the driving motor system respectively.
8. An unexpected electric brake failure control device, further comprising: A first determining unit, configured to determine a risk level and a fault cause corresponding to an unexpected electric brake fault of a vehicle, where the unexpected electric brake fault is used to characterize unexpected deceleration of the vehicle due to an electric brake dysfunction beyond a quantified safety boundary, the quantified safety boundary is a threshold value of unexpected deceleration and duration associated with each risk level, the risk level is determined based on hazard analysis and risk assessment, and the fault cause is traced back through architecture-level fault tree analysis; A second determining unit, configured to determine a safety requirement based on the risk level and the failure cause, where the safety requirement includes generation control of an electric brake request, execution process monitoring of the electric brake request, and management and degradation when unexpected electric brake failure occurs; and a limiting unit for configuring an actually executed electric braking force of the vehicle based on the safety demand to limit the unexpected electric braking force within the quantized safety margin.
9. A computer-readable storage medium, characterized in that the computer-readable storage medium comprises a stored program, wherein the steps of the unexpected electric brake failure control method according to any one of claims 1 to 7 are implemented when the program is executed by a processor.
10. An electronic device comprising at least one processor and at least one memory coupled to the processor, wherein the processor is configured to invoke program instructions in the memory to perform the steps of the unexpected electric brake failure control method of any one of claims 1 to 7.

Description

Unexpected electric brake fault control method and related equipment Technical Field The invention relates to safety of an automobile electric control function, in particular to an unexpected electric braking fault control method and related equipment. Background In the field of new energy automobiles, the electric braking technology deeply fuses the functions of energy recovery and braking, and the application of the electric braking technology needs to cover multiple scenes, and relates to complex coordination of multiple systems such as driving, braking, batteries, motors and the like. This complexity makes system failure prone to cause unexpected feedback torque, resulting in unexpected deceleration or over-braking of the vehicle, and there is a safety risk such as rear-end collision. Currently, existing solutions within the industry have significant limitations. For example, a security defense system aiming at a single pedal mode is constructed, but the method is essentially passive prevention and control of post-remediation, focuses on a single operation mode, fails to cover the hazard in the whole electric braking scene, and more importantly, lacks a complete development link from the forward tracing of the hazard from the whole vehicle level to the bottom layer fault and is decomposed into executable security requirements of each system, meanwhile, security responsibilities and cooperative interfaces among cross-domain systems are not clear, and complex risks of multi-fault superposition are difficult to deal with. The method is based on the fact that the prior art lacks a set of system for controlling unexpected electric braking safety, which is started from the whole vehicle level and covers the whole link of hazard identification, risk assessment and demand decomposition to cooperative control. Disclosure of Invention In view of the above, the present invention provides a method and related apparatus for controlling unexpected electric brake failure, and is mainly aimed at solving the problem that a more complete safety management and control system is lacking for unexpected electric brake failure. To solve at least one of the above problems, in a first aspect, the present invention provides an unexpected electric brake failure control method, including: Determining a risk level and a fault cause corresponding to an unexpected electric brake fault of the vehicle, wherein the unexpected electric brake fault is used for representing unexpected deceleration of the vehicle, which is generated due to abnormal electric brake function and exceeds a quantified safety boundary, the quantified safety boundary is a threshold value of unexpected deceleration and duration time related to each risk level, the risk level is determined based on hazard analysis and risk assessment, and the fault cause is obtained through tracing through architecture-level fault tree analysis; Determining a safety requirement based on the risk level and the failure cause, wherein the safety requirement comprises generation control of an electric brake request, execution process monitoring of the electric brake request and management and degradation when unexpected electric brake failure occurs; the actual executed electric braking force of the vehicle is configured based on the safety demand to limit the unintended electric braking force to within a quantified safety margin. Optionally, the determining the risk level and the fault cause corresponding to the unexpected electric brake fault of the vehicle includes: Acquiring all unexpected electric braking faults generated by abnormal functions of a vehicle in a braking energy recovery scene, a sliding energy recovery scene and a hydraulic braking fluid replacement scene; And respectively grading all the unexpected electric brake faults based on preset standards in a typical operation scene in three dimensions of event severity, exposure probability and driver controllability to determine a risk level corresponding to each unexpected electric brake fault, wherein the risk level is related to the safety integrity level of the automobile. Optionally, the determining the risk level and the fault cause corresponding to the unexpected electric brake fault of the vehicle includes: And taking the unexpected electric brake fault as a top event, and performing gradual decomposition from top to bottom on the whole vehicle architecture level so as to trace back the fault reasons from the driving control system, the brake control system, the driving motor system and the power battery management system. Optionally, the method further comprises: Inputting the deceleration and the duration of the unexpected electric braking fault of the front vehicle to a preset kinematic analysis model so as to output the collision relative speed and collision avoidance possibility of the rear vehicle, wherein the preset kinematic analysis model is used for simulating the unexpected electric braking fault of the