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CN-122008869-A - Intelligent driving risk control method and application in failure scene of power battery system

CN122008869ACN 122008869 ACN122008869 ACN 122008869ACN-122008869-A

Abstract

The invention belongs to the technical field of intelligent driving safety control, and provides an intelligent driving risk control method and application under a failure scene of a power battery system, wherein the method is executed by a vehicle control system configured with a main battery and standby battery cooperative framework and comprises the steps of responding to a main battery failure signal, controlling a standby battery to supply power for the intelligent driving system, and matching a differential MRM control strategy based on a main battery failure scene identification result; and continuously recording the fault data of the main battery and the operation data of the standby battery by a storage module built in the standby battery before and after the failure signal of the main battery is triggered so as to generate an encrypted file for fault analysis. The invention can solve the safety risk problem caused by the interruption of power supply and single control logic of the intelligent driving system after the failure of the existing power battery.

Inventors

  • LI HUACHAO
  • WANG JUN
  • YUE LIJIAO

Assignees

  • 安徽江淮汽车集团股份有限公司

Dates

Publication Date
20260512
Application Date
20260318

Claims (10)

  1. 1. The intelligent driving risk control method under the power battery system failure scene is characterized by being executed by a vehicle control system provided with a main battery and standby battery cooperative framework and comprising the following steps of: Step S100, a standby battery is controlled to supply power for an intelligent driving system in response to a main battery failure signal, and a differential MRM control strategy is matched based on a main battery failure scene identification result, wherein the differential MRM control strategy comprises an emergency stop strategy, a risk avoidance strategy and an energy supplementing stop strategy; Step S200, executing the differentiated MRM control strategy, synchronously executing high-voltage safety protection operation in the executing process, and dynamically judging whether to transfer the vehicle control right to the driver based on the detection of the driver operation; Step S300, before and after the primary battery failure signal is triggered, continuously recording the primary battery failure data and the backup battery operation data by the storage module built in the backup battery, so as to generate an encrypted file for failure analysis.
  2. 2. The intelligent driving risk control method according to claim 1, wherein in step S100, controlling the backup battery to supply power to the intelligent driving system includes: and responding to the main battery failure signal, and controlling a high-voltage contactor of the standby battery to be closed within a preset time so as to take over the power supply of the intelligent driving system, wherein the standby battery is a lithium iron phosphate battery pack.
  3. 3. The intelligent driving risk control method according to claim 1, wherein in the step S100, the main battery failure scene recognition includes: When a first failure condition is met, identifying the current scene as a complete power failure scene of the main battery, wherein the first failure condition is that a high-voltage contactor of the main battery is disconnected, and the voltage of the main battery is lower than a preset power supply threshold value; when a second failure condition is met, the current scene is identified as a main battery thermal runaway early warning scene, wherein the second failure condition is that the single temperature of the main battery exceeds a preset safety threshold value, and/or the voltage of the main battery is reduced below the preset threshold value in preset time; And when a third failure condition is met, identifying the current scene as a local failure scene of the main battery, wherein the third failure condition is that the residual capacity of the main battery is lower than a first preset threshold value and/or the output power is lower than a second preset threshold value.
  4. 4. The intelligent driving risk control method according to claim 3, wherein in the step S100, based on the main battery failure scene recognition, matching the differential MRM control strategy includes: When the situation that the main battery is completely powered off is identified, the emergency parking strategy is matched, wherein the emergency parking strategy comprises the steps of starting a vehicle warning system after the standby battery takes over power supply, synchronously performing environment sensing to plan a path to an emergency lane, controlling the vehicle to slow down and park to the emergency lane along the planned path, and automatically sending rescue request information after the vehicle is parked stably.
  5. 5. The intelligent driving risk control method according to claim 3, wherein in the step S100, based on the main battery failure scene recognition, matching the differential MRM control strategy includes: When the main battery thermal runaway early warning scene is identified, the risk avoiding strategy is matched, wherein the risk avoiding strategy comprises the steps of starting a vehicle warning system, planning a risk avoiding path to a preset safety area, controlling a vehicle to run along the risk avoiding path at preset safety acceleration so as to depart from the current high-risk environment, automatically triggering a vehicle-mounted fire extinguishing system after the vehicle reaches the preset safety area, and sending an emergency evacuation prompt.
  6. 6. The intelligent driving risk control method according to claim 3, wherein in the step S100, based on the main battery failure scene recognition, matching the differential MRM control strategy includes: When the local fault scene of the main battery is identified, the energy supplementing and stopping strategy is matched, wherein the energy supplementing and stopping strategy comprises the steps of closing a preset unnecessary intelligent driving sensor, planning a driving path to a nearest energy supplementing point as a remote energy supplementing path based on the remaining driving mileage of a vehicle and map information, controlling the vehicle to drive along the remote energy supplementing path at a speed not exceeding a first preset threshold value, and controlling the standby battery to switch to a floating charge mode and controlling the main battery to enter a dormant state after the vehicle reaches the energy supplementing point and stops.
  7. 7. The intelligent driving risk control method according to claim 1, wherein the high voltage safety protection operation in step S200 includes triggering a high voltage interlock and cutting off the main battery high voltage circuit in response to a main battery failure signal, and cutting off the backup battery high voltage output and maintaining the minimum necessary low voltage power supply if the high voltage system insulation state is detected to be lower than a safety threshold after the vehicle is parked.
  8. 8. The intelligent driving risk control system under a power battery system failure scene is characterized in that the system is configured with a main-standby battery cooperative architecture and comprises: The failure scene recognition and strategy matching module is used for responding to a main battery failure signal, controlling a standby battery to supply power for the intelligent driving system, and matching a differential MRM control strategy based on the main battery failure scene recognition result, wherein the differential MRM control strategy comprises an emergency stop strategy, a risk avoidance strategy and an energy supplementing stop strategy; the execution and safety protection module is used for executing the differentiated MRM control strategy, synchronously executing high-voltage safety protection operation in the execution process, and dynamically judging whether to transfer the vehicle control right to the driver or not based on the detection of the driver operation; And the fault tracing module is used for continuously recording the fault data of the main battery and the operation data of the standby battery by the storage module arranged in the standby battery before and after the failure signal of the main battery is triggered so as to generate an encrypted file for fault analysis.
  9. 9. A computer readable storage medium having stored thereon computer readable instructions which, when executed by a processor of a computer, cause the computer to perform the intelligent drive risk control method in a power battery system failure scenario of any one of claims 1to 7.
  10. 10. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor, when executing the computer program, implements the steps of the method for controlling risk of driving in a failure scenario of a power battery system according to any one of claims 1 to 7.

Description

Intelligent driving risk control method and application in failure scene of power battery system Technical Field The application relates to the technical field of intelligent driving safety control, in particular to an intelligent driving risk control method and application in a power battery system failure scene. Background With the development of the integration of the electric automobile and the intelligent driving technology, the power battery system is used as a core energy component, and the failure such as complete power failure, thermal runaway and local failure can directly lead to the power interruption and control logic failure of the intelligent driving system, thereby further causing secondary accidents such as vehicle runaway, rear-end collision and the like. Existing intelligent driving car and MRM strategies typically suffer from the following disadvantages: 1. the power supply guarantee is lacking, most electric vehicles are not provided with standby batteries, the intelligent driving system is powered off immediately after the main battery fails and cannot execute safe stop operation, and partial schemes for configuring the standby batteries only provide low-voltage power supply and cannot meet the high-voltage requirements of intelligent driving sensing, decision making and executing modules. 2. The control logic is single, the failure type of the power battery is not distinguished by the existing MRM strategy, the control strategy of sudden braking and roadside stopping is uniformly adopted, rear-end collision is easily caused by sudden braking under the complete power failure scene, and the requirement of rapidly separating from the traffic flow is not considered under the thermal runaway scene. 3. The safety protection is insufficient, the main battery and the standby battery are not physically isolated, the standby battery is easy to be damaged in a continuous way when the main battery is in thermal runaway, and the problem that a driver is easy to intervene in the MRM flow by misoperation due to lack of a driver taking over a cooperative mechanism is solved. In addition, in the prior art, a power supply system for ensuring normal electricity consumption of the whole vehicle and a control method for the power battery after failure exist, but the problems of the MRM strategy cannot be effectively solved by the technologies. For example, patent publication number CN116278763B discloses a redundant power supply system and a control method thereof, wherein the system comprises a power battery, a DCDC converter, a main storage battery, a power isolation module and a standby storage battery, wherein the power isolation module is provided with a main circuit, a first circuit and a second circuit which are arranged in parallel, one end of the first circuit is connected with a main power supply loop, the other end of the first circuit is connected with the main circuit, one end of the second circuit is connected with the standby storage battery, the other end of the second circuit is connected with the main circuit, MOSFETs Q1 and Q2 are arranged on the first circuit in series, MOSFETs Q3 and Q4 are arranged on the second circuit in series, the power isolation module is also provided with a first monitoring circuit, a second monitoring circuit, a first driving circuit and a second driving circuit, and a battery power sensor which is in communication connection with the power isolation module is arranged on the standby storage battery. The system only simply ensures the normal power utilization of the whole vehicle, and ensures the reliability and the service life of the standby storage battery. The invention also discloses a control mode for a new energy automobile with a range-extended power battery after failure, for example, the patent application document with the publication number CN118636676A discloses a control mode for the new energy automobile with the range-extended power battery after failure, which comprises the following steps that a whole automobile controller judges whether the failure level of the power battery is more than or equal to 3, if the failure level of the power battery is less than or equal to 3, normal operation is executed, if the failure level of the power battery is more than or equal to 3, an instruction is issued, the power battery is enabled to disconnect a main positive relay, a main negative relay and shield the failure sent by the power battery, when the power battery has high-level failure and Rly1 and Rly3 are disconnected, the whole automobile controller shields the failure level of the power battery, the failure level of the power battery is not received any more, the power supply requirement of the whole automobile is completely provided by the range-extended device, and a user is reminded of the power battery to have a problem, and the whole automobile can continue running, and the problem that the whole automobile cannot run after the power battery