Fuel Cell Isolation Valve Safety Switch Mechanism
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Solution Overview
Problem
Current fuel cell vehicle systems lack a reliable mechanism to safely disconnect the fuel system during maintenance, repairs, or emergencies, risking accidental ignition and uncontrolled fuel release due to the absence of a dedicated shut-off valve that defaults to a closed position without power, posing safety hazards for workers and rescue personnel.
Innovation Solution
A pressure vessel system with an isolation valve that defaults to a closed position without power, accompanied by a safety switch that securely interrupts and reauthorizes power to the valve, ensuring the valve remains closed until authorized, preventing accidental activation and providing a secure method to disconnect the fuel system during maintenance or emergencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the isolating valve is designed to close when power is off (fail-safe design), then safety during maintenance and emergencies is improved, but the risk of accidental closure during normal operation increases
Solution Approach 1:
The patent introduces a safety switch as an intermediary device between the ignition switch and the isolating valve. This safety switch acts as a mediator that must be explicitly activated to enable the isolating valve to respond to ignition signals, preventing accidental closure while maintaining fail-safe behavior during emergencies
Solution Approach 2:
The safety switch must be activated in advance before the isolating valve can be opened during normal operation. This preliminary action ensures that the system is explicitly authorized to operate, preventing accidental closure while maintaining the ability to quickly close during emergencies
2Reliability
If a safety switch is added to interrupt power to the isolating valve, then protection against accidental activation is improved, but device complexity increases
Solution Approach 1:
The safety switch is designed to serve multiple functions: it prevents accidental activation during maintenance, enables controlled operation during normal use, and works together with the fail-safe valve design to provide emergency shutdown capability. This multi-functionality justifies the added component by consolidating multiple safety requirements into a single device
3Productivity
If the isolating valve remains open during operation for fuel flow, then productivity is improved, but the risk of uncontrolled fuel release during accidents increases
Solution Approach 1:
The patent implements a fail-safe design where the isolating valve defaults to the closed position when power is removed or not explicitly authorized. This beforehand cushioning ensures that in the event of an accident causing power loss, the valve automatically closes to prevent uncontrolled fuel release, while during normal operation with proper authorization, the valve remains open for fuel flow
Data Source
Figure 1
AI summary
The technology disclosed here relates to a pressure container system for a motor vehicle. The system comprises: 1) at least one pressure container (100) for storing a fuel, wherein the pressure container system has an isolating valve (120) which is designed, in the de-energized state, to interrupt the fluid connection (200) between the pressure container and at least one combustion gas consumer (210); and 2) at least one safety switch (310), wherein the safety switch (310) is designed to interrupt the energy supply to the isolating valve (120).