Fuel Cell Shutoff Valve Control for Post-Stop Discharge and Filling
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Solution Overview
Problem
Fuel cell systems face issues with solid polymer electrolyte membrane deterioration due to oxygen remaining in the cathode flow passage during shutdown, and existing techniques for hydrogen tank filling lack efficiency in communication between the vehicle and the fueling station.
Innovation Solution
A method for controlling a fuel cell system that includes a shutoff valve to supply fuel gas from a storage container to the fuel cell for post-stop discharge, a transmitter to send data signals about the storage container's state, and a filling instruction controller to fill the storage container with hydrogen gas from a fuel supply source, ensuring efficient oxygen consumption and pressure maintenance in the anode flow passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shutoff valve is opened to supply fuel gas for post-stop discharge, then oxygen consumption in the cathode flow passage is improved, but the filling instruction cannot be executed properly
Solution Approach 1:
The shutoff valve dynamically switches between two states: open for post-stop discharge (fuel cell protection) and closed for filling operation (filling efficiency). The control unit monitors the system state and automatically adjusts the valve position based on whether post-stop discharge or filling is the priority, resolving the contradiction between these two functions
Solution Approach 2:
The system changes the operational parameter of the shutoff valve from a fixed state to a controllable variable state. By adjusting the valve opening/closing timing and duration, the system optimizes both oxygen consumption during post-stop discharge and hydrogen filling efficiency, transforming a static component into a dynamic control element
2Productivity
If the shutoff valve is closed to prioritize filling instruction, then filling efficiency is improved, but oxygen consumption in the cathode flow passage is reduced
Solution Approach 1:
The shutoff valve dynamically switches between two states: open for post-stop discharge (fuel cell protection) and closed for filling operation (filling efficiency). The control unit monitors the system state and automatically adjusts the valve position based on whether post-stop discharge or filling is the priority, resolving the contradiction between these two functions
Solution Approach 2:
The system changes the operational parameter of the shutoff valve from a fixed state to a controllable variable state. By adjusting the valve opening/closing timing and duration, the system optimizes both oxygen consumption during post-stop discharge and hydrogen filling efficiency, transforming a static component into a dynamic control element
3Measurement precision
If communication fueling is implemented, then filling precision is improved, but system complexity increases due to data signal transmission requirements
Solution Approach 1:
The system implements feedback by transmitting data signals between the vehicle and fueling station. The vehicle sends information about its fuel cell system state (temperature, pressure, oxygen levels) to the station, which uses this feedback to adjust the filling process parameters, achieving precise control while managing complexity through standardized communication protocols
Solution Approach 2:
The data signal transmission system serves multiple functions: monitoring fuel cell state, controlling filling precision, and coordinating the shutoff valve operation. By making the communication system multi-functional, the patent reduces overall system complexity rather than adding separate systems for each function
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
Prevents fuel cell deterioration by consuming oxygen in the cathode flow passage and maintains high anode pressure, enabling efficient hydrogen tank filling and reducing user dissatisfaction by prioritizing filling over post-discharge processes.
Implementation Method 1
a fuel cell configured to generate electricity using fuel gas and oxidant gas supplied to the fuel cell
Data Source
AI summary
In a method for controlling a fuel cell system, a shutoff valve is opened to supply a fuel gas from a storage container to a fuel cell after a fuel cell system shutdown instruction is sent to the fuel cell system so that the fuel cell generates and discharges electricity. The storage container is supplied to the fuel gas supplied from a fuel supply source provided outside the fuel cell system in response to a filling instruction to supply the fuel gas to the storage container. A data signal indicating a state of the storage container is transmitted to the fuel supply source. The shutoff valve is closed and the storage container is supplied to the fuel gas supplied from the fuel supply source if the filling instruction is output while opening the shutoff valve after the fuel cell system shutdown instruction is sent.