In-Vehicle Emergency Report Power Source Switching Logic
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Solution Overview
Problem
Existing in-vehicle emergency report systems unnecessarily consume auxiliary battery capacity by frequently switching power sources from the vehicle battery to the auxiliary battery, even when there is no emergency report operation involved.
Innovation Solution
An in-vehicle emergency report apparatus that uses a control circuit to switch the power source from the vehicle battery to the auxiliary battery only when a collision is determined to be possible, and returns to the vehicle battery when the collision is confirmed or deemed unlikely, allowing for efficient power management and minimizing auxiliary battery usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the operating power source is switched from the vehicle battery to the auxiliary battery each time the supply voltage drops, then the emergency report operation can be performed with reliability, but the capacity of the auxiliary battery is uselessly consumed
Solution Approach 1:
The control circuit switches to the auxiliary battery in advance when a collision possibility is detected, rather than switching every time the voltage drops. This preliminary action ensures reliability by having power ready before needed, while avoiding unnecessary consumption by not switching during normal voltage drops that are not related to collision risks
Solution Approach 2:
The system changes the switching criterion from a simple voltage threshold to a composite parameter including collision possibility determination. This parameter change allows the system to distinguish between voltage drops that require switching (pre-collision) and those that don't (normal operation), thereby reducing unnecessary auxiliary battery consumption while maintaining reliability
2Reliability
If the operating power source is switched frequently from the vehicle battery to the auxiliary battery, then the emergency report operation can be ensured, but the frequency of auxiliary battery replacement increases
Solution Approach 1:
The system performs preliminary switching to the auxiliary battery only when collision possibility is detected, ensuring emergency report availability is maintained while avoiding frequent unnecessary switching that would reduce battery service life
Solution Approach 2:
The control circuit uses feedback from the collision possibility determining unit to intelligently control power source switching. This feedback mechanism prevents frequent unnecessary switching by only activating auxiliary battery when actually needed, thereby extending battery service life while ensuring emergency operation availability
Data Source
AI summary
An in-vehicle emergency report apparatus is so constructed that the operating power source is switched from a vehicle battery to an auxiliary battery only when a pre-crash safety ECU determines that a vehicle will collide with something. That is, the operating power source is switched from the vehicle battery to the auxiliary battery only when there is a possibility that the vehicle will collide with something to thereby perform emergency report operation. This makes it possible to effectively switch the operating power source from the vehicle battery to the auxiliary battery and to prevent the capacity of the auxiliary battery from being uselessly consumed.