EV High Voltage Shutdown During Charging
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Solution Overview
Problem
Current high voltage shut down systems in electric vehicles do not function during charging, posing safety risks of vehicle fires and human injuries due to high voltage disconnection and current inflow during collisions.
Innovation Solution
A system and method that includes a collision detection unit and a high voltage controller to perform a high voltage shut down function when a collision is detected, utilizing a third power supply controller to provide power during charging and a first power supply controller for starting the vehicle, ensuring the airbag and event data recorder receive necessary power to operate and record collision data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the high voltage relay is turned off when an airbag expansion signal is generated by the airbag controller, then high voltage safety is improved during vehicle operation, but the high voltage shut down function does not operate during charging because power is not applied to the airbag controller in key-off state
Solution Approach 1:
The patent applies universality by making the collision detection unit capable of operating in multiple power supply modes. The unit can receive power from either the first power supply controller (during vehicle start) or the third power supply controller (during charging), enabling the high voltage shut down function to work universally across different vehicle states including charging, thereby resolving the limitation of key-off state inactivity
Solution Approach 2:
The patent introduces an intermediary third power supply controller that specifically provides power to the collision detection unit during charging operations. This intermediary component acts as a mediator between the charging system and the safety detection system, enabling collision detection and high voltage shut down functionality during charging without interfering with the main vehicle power management
Data Source
AI summary
A high voltage shut down system and method for an electric vehicle are provided, which perform a high voltage shut down function in connection with a collision detection signal (airbag expansion signal) generated from an airbag controller even when a vehicle is being charged. The high voltage shut down system a third power supply controller which is in an operable state for transmitting power when the vehicle starts and is charged. An airbag control unit is operated by receiving power through the third power supply controller, and is configured to generate an airbag expansion signal when detecting an occurrence of a collision of the vehicle. A high voltage controller is configured to perform a high voltage shut down function in response to receiving the airbag expansion signal.