Vehicular Controller High Voltage Blocking During Ignition-Off Charging
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Solution Overview
Problem
Current vehicular control systems fail to effectively block high voltage during a collision when the vehicle is in an ignition-off state during charging, leading to potential vehicle fires and increased casualties due to instantaneous large current introduction.
Innovation Solution
A vehicular control system that activates a controller when charging begins in an ignition-off state, using sensors like gyro, wheel speed, and motor position sensors to determine external shocks, and interlocks with the airbag controller to block the high voltage system, preventing fires and injuries by blocking the high voltage system when a collision is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the vehicle is in ignition-off state during charging, then power consumption is reduced and charging efficiency is improved, but high voltage blocking function is not activated during collision
Solution Approach 1:
The controller is activated in advance when the charger starts charging in ignition-off state, preparing the high voltage blocking function before a collision occurs. This preliminary activation ensures that when a collision happens during charging, the controller can immediately block the high voltage system, resolving the contradiction between maintaining ignition-off state for charging efficiency and ensuring high voltage blocking capability for safety.
2Reliability
If the controller is activated during charging in ignition-off state, then high voltage blocking function is enabled during collision, but power consumption increases
Solution Approach 1:
The controller operates in periodic cycles during charging - remaining in a low-power standby state and activating fully only when collision is detected through sensor inputs. This periodic activation pattern enables the high voltage blocking function when needed while minimizing power consumption during the majority of the charging period when no collision is present.
3Measurement precision
If sensors are activated to detect external shocks during charging, then collision detection accuracy is improved, but device complexity increases
Solution Approach 1:
The system uses existing multi-functional sensors (gyro sensor, wheel speed sensor, motor position sensor) that serve both normal vehicle operation and collision detection during charging. By leveraging sensors already present in the vehicle for multiple purposes, the system achieves accurate collision detection without adding dedicated sensors or increasing overall device complexity.
Data Source
AI summary
A vehicular control system includes a charger configured to charge a battery of a vehicle from an external power supply source. A controller is configured to be activated when the charger starts charging in an ignition off state of the vehicle and blocks a high voltage system of the vehicle when it is determined that the vehicle receives a shock from outside the vehicle by using positional information transferred from a motor position sensor of a driving motor.