High-Voltage Cut-Off Control for Pre-Crash Vehicle Safety
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Solution Overview
Problem
Existing high-voltage system control devices in vehicles do not adequately prevent electrical shock hazards during crashes, as they often disconnect the high-voltage system after a collision has occurred, rather than proactively cutting it off before impact.
Innovation Solution
A high-voltage system control device equipped with an inter-vehicle distance detection unit and automatic brake system that activates the brake and cuts off the high-voltage system when a pre-crash control is initiated, ensuring disconnection occurs before a potential collision, thereby preventing electrical shock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the high-voltage system is cut off after a crash is detected, then the vehicle safety is improved, but the response time for preventing electrical shock is delayed
Solution Approach 1:
The control device performs preliminary actions by detecting crash possibility in advance using sensors (accelerometers, pressure sensors) and activating the cut-off relay before actual crash occurs. This preliminary detection and action sequence resolves the contradiction by enabling safety intervention before the harmful event fully manifests, thus improving reliability without incurring time loss.
Solution Approach 2:
The system applies preliminary anti-action by preparing the cut-off mechanism in advance and activating it proactively when crash parameters are detected. The control device continuously monitors crash indicators and preemptively disconnects the high-voltage system, creating a counter-action that prevents the harmful effect (electrical shock from crashed battery) before it can occur.
2Object-affected harmful factors
If the high-voltage system is cut off proactively during pre-crash control, then the risk of electrical shock is reduced, but the system complexity increases
Solution Approach 1:
The control device integrates multiple functions into a single unit: it serves as both the crash detection system and the high-voltage cut-off control system. By making the control device universal, the patent reduces overall system complexity while still achieving proactive hazard prevention through integrated sensor input and relay control functionality.
Solution Approach 2:
The patent merges the crash detection functionality with the high-voltage cut-off control functionality into a single integrated control device. This combination eliminates the need for separate detection and control systems, thereby reducing system complexity while maintaining the capability to proactively reduce electrical shock risk.
Data Source
AI summary
A high-voltage system control device is used for a vehicle provided with a high-voltage system including a motor as a power source and a battery to supply electric power to the motor. The device includes: an inter-vehicle distance detection unit to detect an inter-vehicle distance between the vehicle and an target such as a preceding vehicle; an automatic brake to automatically brake the vehicle according to the inter-vehicle distance; and a cut-off control unit to cut off the high-voltage system when the automatic brake is activated. When the vehicle is traveling at a high vehicle speed and the automatic brake is activated, the high-voltage system is cut off with a main relay.