Fuel Cell Vehicle Safety System Insulation Resistance Control
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Solution Overview
Problem
Fuel cell vehicles face challenges in accurately determining collisions, leading to potential damage and secondary accidents like electric shocks due to failures in collision sensors or their connections, which can result in inappropriate air bag deployment.
Innovation Solution
A safety system for fuel cell vehicles that includes a power switch, insulation resistance measuring device, and controller to block power and fuel supplies when a low insulation resistance is detected, preventing accidents by entering a safe mode and closing valves on hydrogen and air supply lines, and utilizing a collision detector and vehicle speed sensor for accurate risk assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If collision sensors are used to determine collision, then collision detection capability is provided, but false detection may occur due to sensor failure or wire failure leading to inaccurate collision determination
Solution Approach 1:
The patent introduces an insulation resistance measuring device as an intermediary component to verify the integrity of the collision sensor system. Before trusting collision sensor signals, the system measures insulation resistance between the sensor wire and chassis to detect wire failures or sensor failures. This intermediary verification step prevents false collision detection while maintaining the original collision detection capability.
2Ease of operation
If air bag deployment is controlled only by collision sensor signals, then air bag control is simplified, but actual collision may not be determined accurately leading to inappropriate air bag deployment
Solution Approach 1:
The patent implements preliminary action by measuring insulation resistance before processing collision sensor signals. The system proactively checks the integrity of the collision detection system through insulation resistance measurement, and only processes collision signals when the insulation resistance is within the normal range. This preliminary verification ensures accurate collision determination while maintaining relatively simple air bag control logic.
3Reliability
If insulation resistance measuring device is added to verify collision sensor integrity, then false collision detection is prevented, but system complexity increases
Solution Approach 1:
The patent applies universality by designing the insulation resistance measuring device to serve multiple functions: it measures insulation resistance of collision sensor wires, verifies sensor integrity, and provides diagnostic information about the safety system. By making this single device multi-functional, the patent reduces overall system complexity while maintaining improved reliability through insulation resistance verification.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively prevents electric shock accidents by determining the vehicle's risk state based on insulation resistance and collision detection, ensuring safe operation by blocking power and fuel supplies when necessary, thereby enhancing safety and preventing secondary accidents.
Implementation Method 1
an insulation resistance measuring device measuring an insulation resistance between the power wire and a chassis
Data Source
AI summary
Disclosed are a safety system of a fuel cell vehicle and a control method for the safety system. A safety system of a fuel cell vehicle using a fuel cell and a high voltage battery as a power source may include: a power switch disposed on a power wire connecting the power source and a power load to each other; an insulation resistance measuring device measuring an insulation resistance between the power wire and a chassis; and a controller controlling an operation of the power switch based on a measured insulation resistance measured by the insulation resistance measuring device. When the measured insulation resistance is equal to or less than a reference resistance, the controller enters a safe mode and the power switch is turned off to thereby block power supplied to the power load.