Electric vehicle collision anti-electric shock protection system and electric vehicle

Abstract

According to the electric vehicle anti-electric shock protection system and the electric vehicle, the SDM is further connected with the BMS and the DC / DC converter and sends the collision signal to the BMS and the DC / DC converter, so that even if the VCU breaks down or communication between the VCU and the BMS and communication between the VCU and the DC / DC converter breaks down, the BMS can directly open the main relay according to the collision signal, the DC / DC converter can directly discharge according to the collision signal, and the safety of the electric vehicle is improved. Personal safety protection of a driver, passengers and people around the vehicle is improved. When a collision sensor fails or SDM communication is lost, whether collision occurs or not is obtained by comprehensively analyzing the detected vehicle high-voltage insulation resistance value, and when collision occurs, a main relay is turned on and high-voltage discharge is performed; and a discharge device connected with a high-voltage loop of the electric vehicle is also arranged for reducing the voltage of the high-voltage end. Personal safety protection of the driver, passengers and people around the vehicle is further improved.

Description

technical field [0001] The present invention relates to the field of electric vehicles, and more particularly, to an electric vehicle collision and electric shock protection system and an electric vehicle. Background technique [0002] Electric vehicles isolate high-voltage systems through high-voltage protection components to ensure the personal safety of drivers, passengers and people around the vehicle. When a collision occurs, the high-voltage protection components of the electric vehicle may be damaged, causing the risk of high-voltage electric shock to personnel. For existing protection schemes see figure 1 . After the collision, the collision sensor transmits the collision signal to the airbag controller SDM; the SDM sends the collision signal to the vehicle controller VCU; the VCU then sends instructions to the battery management system BMS and the DC / DC converter respectively, and the BMS turns on the main engine according to the instructions. Relays, DC / DC conve...

AI Technical Summary

Problems solved by technology

[0003] Existing protection schemes rely on the normal operation of components in each link, and the failure of any link in the process will lead to risks

If the VCU fails, or the communication between the VCU and the BMS or DC / DC converter fails, the BMS cannot know the request to turn on the main relay, the DC / DC converter cannot know the discharge request, and the high-voltage system fails to power off, causing risks

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