Hydrogen Tank Valve Recovery Control for Stable Fuel Cell Supply
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Solution Overview
Problem
The existing excess flow valve in hydrogen tanks for fuel cell vehicles operates mechanically, making it difficult for the controller to detect its state, leading to instability in hydrogen supply due to potential closure, which can cause the vehicle to shut off due to lack of hydrogen.
Innovation Solution
A valve recovery control apparatus that includes a control unit to determine the state of the excess flow valve based on hydrogen consumption and pressure reduction rates, suspending fuel cell operation until the valve returns to an open state and operating the vehicle in electric mode until recovery, ensuring stable hydrogen supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an excess flow valve is mounted on the hydrogen tank to prevent excess flow, then hydrogen supply safety is improved, but the valve's mechanical operation without electrical feedback makes it difficult to detect its state, leading to potential supply instability
Solution Approach 1:
The control unit continuously monitors hydrogen consumption from the fuel cell and compares it against expected consumption patterns. When the excess flow valve closes due to pressure differential, hydrogen supply drops, and the control unit detects this discrepancy between expected and actual consumption, providing feedback about the valve's operational state without direct mechanical feedback from the valve itself.
Solution Approach 2:
The control unit acts as an intermediary that infers the valve's state by monitoring the hydrogen consumption of the fuel cell. Instead of directly detecting the mechanical valve position, the system uses the fuel cell's hydrogen consumption as an indirect indicator to determine whether the valve is open or closed.
2Reliability
If the excess flow valve operates with high operability due to pressure differential, then excess flow prevention is improved, but the valve may close unnecessarily causing vehicle shutdown due to lack of hydrogen supply
Solution Approach 1:
The control unit continuously monitors hydrogen consumption and pressure differential across the excess flow valve. When the valve closes due to excessive pressure differential, the system detects the resulting drop in hydrogen supply and can identify this as an abnormal condition, providing feedback to distinguish between normal valve operation and abnormal closure that requires intervention.
Solution Approach 2:
The control unit dynamically adjusts its monitoring and response based on real-time conditions. By continuously tracking hydrogen consumption patterns and pressure differential, the system can adapt its behavior to maintain vehicle operation continuity while still preventing excess flow, resolving the contradiction between valve operability and vehicle productivity.
3Adaptability or versatility
If the hydrogen supply line is made long and complicated to accommodate commercial vehicle requirements, then adaptability is improved, but pressure loss increases causing the outlet pressure to be lower than inlet pressure, triggering unnecessary valve closure
Solution Approach 1:
The control unit dynamically monitors the pressure differential across the excess flow valve and distinguishes between normal pressure loss due to long supply lines and abnormal pressure differential indicating valve closure. By continuously tracking pressure conditions and hydrogen consumption patterns, the system adapts its interpretation of valve state based on the specific vehicle configuration and operating conditions.
Solution Approach 2:
The control unit uses hydrogen consumption data as an intermediary to infer whether pressure differential is causing normal pressure loss or abnormal valve closure. Instead of directly measuring valve position or relying solely on pressure sensors, the system uses the fuel cell's hydrogen consumption as an indirect indicator to determine the true operational state.
Data Source
AI summary
A valve recovery control apparatus for a hydrogen tank, may recover an excess flow valve to an original state upon operation of the excess flow valve mounted on the hydrogen tank, securing stability of hydrogen supply to the fuel cell.