Pre-Collision Voltage Unloading Control for EV High-Voltage Safety
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Solution Overview
Problem
Existing high-voltage safety protection systems in electric vehicles rely on passive measures that disconnect high-voltage relays after a collision, lacking the ability to adjust the duration of voltage unloading based on collision conditions, leading to potential safety hazards and increased risk of fire or electricity leakage.
Innovation Solution
A parameter setting method and apparatus that determines a pre-collision level based on vehicle operation parameters to set the duration of unloading voltage from electric components, adjusting the unloading time according to different collision probabilities, thereby enhancing safety by reducing high-voltage load duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If passive safety protection is used to disconnect high-voltage relay after collision, then safety problems from high-voltage wire harness exposure and short circuit are avoided, but the duration of voltage unloading cannot be adjusted based on collision conditions, leading to increased risk of fire or electricity leakage
Solution Approach 1:
The patent implements dynamic adjustment of voltage unloading duration based on real-time collision level detection. The system transitions from a static, fixed-duration unloading mechanism to a dynamic one where the unloading duration varies according to the detected collision level (first level through fourth level), allowing the protection duration to adapt to different collision severity conditions
Solution Approach 2:
The patent changes the parameter of voltage unloading duration based on collision conditions. By detecting different collision levels and corresponding to different unloading durations (first duration for first level, second duration for second level, etc.), the system modifies the temporal parameter of voltage unloading to match the severity of the collision event
2Device complexity
If fixed duration voltage unloading is applied regardless of collision conditions, then the control system is simple, but the safety protection is insufficient for different collision scenarios
Solution Approach 1:
The patent segments the collision detection into multiple distinct levels (first level, second level, third level, fourth level), each corresponding to different collision scenarios. This segmentation allows the system to provide differentiated protection durations for different collision severities, improving safety effectiveness while maintaining relatively simple control logic through clear level-based decision making
Data Source
AI summary
A parameter setting method includes: determining a pre-collision level of a vehicle according to operation parameters of the vehicle, where the pre-collision level is configured to represent a probability that the vehicle is about to crash; and setting a duration of unloading a voltage from an electric component of the vehicle according to the pre-collision level.