Collision protection system and protection method thereof for high-voltage safety of electric/hybrid electric automobile

Abstract

The invention provides a collision protection system and a protection method thereof for the high-voltage safety of an electric / hybrid electric automobile. The collision protection system comprises a collision transducer group for detecting collision in multiple directions, a safety air bag controller, a whole-automobile controller for disconnecting a high-voltage battery relay, and an automobile body controller for unlocking a door lock, wherein the collision transducer group is connected with the safety air bag controller; a signal output end of the safety air bag controller is connected with the whole-automobile controller and the automobile body controller respectively. As the collision transducer group can induce the collision in multiple directions, the collision protection system is higher in safety in comparison with a traditional single collision switch; collision information is transmitted to the whole-automobile controller through the safety air bag controller, and the safety level can be improved through software / hardware design redundancies; the collision information is also transmitted to the automobile body controller through the safety air bag controller, and the door lock is timely unlocked to practically protect the personal safety of a driver.

Description

technical field [0001] The invention relates to the technical field of safety systems for new energy vehicles, in particular to a high-voltage safety collision protection system for electric / hybrid vehicles and a protection method thereof. Background technique [0002] With the development of modern high-tech and the increasingly prominent problems of environment and energy in today's world, new energy vehicles (electric vehicles and hybrid vehicles) have become the focus of the automotive industry due to their superior environmental protection features, but the new energy vehicles The voltage of the high-voltage battery will exceed the safe voltage by 60V, usually between 300V-400V. After these high-voltage devices and high-voltage circuits collide, the insulation failure will cause electric shock to injure the occupants, and more seriously, a high-voltage short circuit will cause the vehicle to burn or explode. Therefore, new energy vehicles must be equipped with a device ...

AI Technical Summary

Problems solved by technology

After these high-voltage devices and high-voltage circuits collide, the insulation failure will cause electric shock to injure the occupants, and more seriously, a high-voltage short circuit will cause the vehicle to burn or explode. Therefore, new energy vehicles must be equipped with a device that cuts off the high-voltage subsystem circuit during a collision.

At present, the collision safety scheme of many new energy vehicles is to add a collision switch to the body, which is connected between the vehicle controller and the battery management system. When the vehicle collides, the switch is disconnected and the BMS enabling relay is disconnected. , to ensure the high-voltage safety of the whole vehicle, but this solution has three disadvantages: 1: The switch type technology is backward, easy to malfunction and can only detect collisions in one direction; 2: There is no integrated control chip inside the switch, which cannot meet the redundant design of software and hardware. Cannot reach the safety level of ASIL C; 3: increase cost

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