Fuel Cell State Control for Voltage Stability and Catalyst Protection
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Solution Overview
Problem
Voltage fluctuation in fuel cells due to variations in internal states, such as membrane humidity, catalytic oxide film ratio, and diffusion resistance, leads to deterioration of catalyst performance and power generation efficiency.
Innovation Solution
A fuel cell system comprising a fuel cell, two actuators, and a control unit that adjusts internal state quantities like membrane humidity, catalytic oxide film ratio, and diffusion resistance to maintain them at predetermined target values, thereby stabilizing the output voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the internal state of the fuel cell is allowed to vary, then the system operates flexibly, but voltage fluctuation occurs causing catalyst deterioration
Solution Approach 1:
The control unit continuously monitors state quantities indicating the internal state of the fuel cell and adjusts actuator operations based on this feedback to maintain state quantities within target ranges, thereby preventing voltage fluctuation and catalyst deterioration while allowing flexible operation
Solution Approach 2:
The system changes operational parameters by adjusting actuator operations to maintain state quantities within optimal ranges, allowing the fuel cell to adapt to different operating conditions while keeping voltage stable to prevent catalyst deterioration
2Reliability
If multiple actuators are used to control internal state, then voltage stability is improved, but device complexity increases
Solution Approach 1:
Multiple actuators are employed where each actuator can influence multiple state quantities, and the control unit coordinates their operations to achieve voltage stability while managing system complexity through integrated control
3Reliability
If state quantities are maintained at target values, then catalyst deterioration is prevented, but control complexity increases
Solution Approach 1:
The control unit uses feedback from state quantity measurements to adjust actuator operations, maintaining state quantities within target ranges to prevent catalyst deterioration while managing control complexity through systematic monitoring and adjustment
Data Source
AI summary
A fuel cell system includes a fuel cell, a first actuator capable of adjusting a first state quantity indicating an internal state of the fuel cell, a second actuator capable of adjusting a second state quantity indicating the internal state of the fuel cell, and a control unit. The control unit is configured to perform a first control and a second control, the first control includes acquiring a present value of the first state quantity and controlling operation of the first actuator so that the acquired present value of the first state quantity approaches a predetermined first target value, and the second control includes acquiring a present value of the second state quantity and controlling operation of the second actuator so that the acquired present value of the second state quantity approaches a predetermined second target value.