Electric Vehicle Power Relay for Collision Data Recording
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Solution Overview
Problem
Existing electric vehicles face challenges in recording collision information when the low-voltage battery, which powers the controller, is damaged during a vehicle collision, potentially leading to incomplete or lost data regarding the high-voltage battery's impact history.
Innovation Solution
An electric vehicle system featuring a first low-voltage power storage unit, a second high-voltage power storage unit, an output detector, a collision detector, an information recorder, and a circuit opening/closing unit that switches power supply from the low-voltage to the high-voltage unit upon collision detection and output reduction, ensuring collision information is recorded using the high-voltage unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the low-voltage battery is used to power the controller for recording collision information, then the controller can operate normally during regular vehicle operation, but the collision information cannot be recorded if the low-voltage battery is damaged during a vehicle collision
Solution Approach 1:
The system performs preliminary action by switching the power supply from the low-voltage battery to the high-voltage battery before the collision information recording is affected. The controller detects battery damage and proactively switches power sources, ensuring that the information recorder remains powered and functional to capture collision data even when the primary power source is compromised.
Solution Approach 2:
The high-voltage battery serves as an intermediary power source that takes over when the low-voltage battery fails. The controller acts as a mediator by managing the power supply switching between the two batteries, ensuring continuous operation of the information recorder regardless of the low-voltage battery's condition during a collision.
2Power
If the high-voltage battery is used as the primary power source for the electric motor, then the vehicle achieves high power output, but the high-voltage battery becomes vulnerable to damage during vehicle collision requiring careful handling
Solution Approach 1:
The controller serves as an intermediary that manages the high-voltage battery's role during collisions. By detecting collision conditions and battery damage, the controller mediates between the high-voltage battery's power output function and its vulnerability to collision damage, switching it off when necessary to prevent further damage while maintaining its primary power source status during normal operation.
Solution Approach 2:
The system takes preliminary action by switching off the high-voltage battery when collision is detected, preventing further damage before it occurs. This proactive measure protects the high-voltage battery from additional harm during collision events while maintaining its high power output capability during normal vehicle operation.
3Loss of information
If the low-voltage battery is damaged during vehicle collision, then the power supply for the controller is lost, but collision information recording becomes impossible
Solution Approach 1:
The high-voltage battery acts as an intermediary power source that takes over when the low-voltage battery fails during collision. This ensures the information recorder maintains its power supply and can continue recording collision information, preventing information loss even when the primary control power source is damaged.
Solution Approach 2:
The system changes the power supply parameter by switching from the low-voltage battery to the high-voltage battery when collision conditions are detected. This parameter change ensures continuous power availability for the information recorder, maintaining the ability to record collision information despite damage to the original power source.
Data Source
AI summary
An electric vehicle includes: a low-voltage battery, a high-voltage battery having a voltage higher than that of the low-voltage battery; an output detector that detects an output of the low-voltage battery; a collision detector that detects a vehicle collision, an information recorder to which the low-voltage battery is connected as a power supply and which records collision information from the collision detector; a power supply relay unit that is provided between the high-voltage battery and the information recorder and switched between an opened state in which the high-voltage battery and the information recorder are separated and a closed state in which that are connected; and a controller that switches the power supply relay unit from the opened state to the closed state in the case when a vehicle collision a reduction in the output of the low-voltage battery are detected.