Fuel Cell Warming Threshold Adjustment for Frozen Water
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Solution Overview
Problem
Fuel cell stacks experience reduced power generation performance due to frozen generated water from low-temperature short-time operations, leading to incomplete warming up and inefficient power output, as existing systems do not account for freezing issues in determining warming up completion.
Innovation Solution
A fuel cell system with a warming up status detector, threshold setter, estimator, and threshold changer that adjusts warming up completion thresholds based on the freezing state of generated water, ensuring adequate melting time and temperature for reliable power generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the informing unit is operated based on fixed time intervals from system stopping to starting instruction, then the device complexity is reduced and ease of operation is improved, but the reliability of power generation performance deteriorates when generated water is frozen
Solution Approach 1:
The warming up completion determination threshold is made dynamic rather than fixed. The control unit adjusts the threshold based on detected operating conditions, specifically whether the fuel cell stack temperature is below the freezing point of water. This allows the system to adapt the warming up requirement dynamically, ensuring reliable power generation performance while maintaining ease of operation through automated adjustment.
Solution Approach 2:
The system changes the determination threshold parameter for warming up completion based on the freezing state of generated water. When the fuel cell stack temperature is below freezing, a higher threshold is applied, requiring more extensive warming up. This parameter change ensures that the informing unit only operates when reliable power generation performance can be achieved, resolving the contradiction between ease of operation and reliability.
2Productivity
If the warming up operation is performed for a short time to improve productivity, then the time until power generation is reduced, but the generated water remains frozen causing power generation performance to deteriorate
Solution Approach 1:
The determination threshold for warming up completion is changed based on the freezing state of generated water. When the fuel cell stack temperature is below freezing, the threshold is set higher, automatically extending the warming up operation duration. This ensures that sufficient time is allocated for melting frozen water and achieving reliable power generation performance, while still improving overall productivity by providing clear, condition-based guidance rather than arbitrary fixed times.
3Productivity
If the informing unit is operated before freezing is overcome to improve productivity, then the time until power generation is reduced, but the power generation performance does not reach desired levels
Solution Approach 1:
The warming up completion determination threshold is dynamically adjusted based on the freezing state of generated water. When the fuel cell stack temperature is below freezing, the threshold is set higher to ensure adequate warming up time and performance. This parameter change prevents the informing unit from operating prematurely, ensuring that power generation performance reaches desired levels while still improving productivity through automated, condition-based determination.
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
Accurately informs the driver of warming up completion after ensuring desired power generation performance, even in low-temperature environments, preventing driver discomfort and enhancing system reliability and merchantability.
Implementation Method 1
hydrogen gas serving as fuel gas (anode gas) is supplied to a fuel gas channel between the anode and the separator on the anode side, and air serving as oxidant gas (cathode gas) is supplied to an oxidant gas channel between the cathode and the separator on the cathode side. Accordingly, hydrogen ions produced by a catalytic reaction in the anode pass through the solid polymer electrolyte membrane, move to the cathode, and cause an electrochemical reaction with oxygen in the air in the cathode, so that electric power is generated.
Implementation Method 2
hydrogen ions produced by a catalytic reaction in the anode pass through the solid polymer electrolyte membrane, move to the cathode
Implementation Method 3
hydrogen ions produced by a catalytic reaction in the anode
Data Source
AI summary
A fuel cell system includes a fuel cell stack, a warming up status detector, a warming up completion threshold setter, an informing device, an estimator, and a threshold changer. The warming up status detector is configured to detect a warming up status of the fuel cell stack. The informing device is configured to inform of completion of warming up when a value corresponding to a warming up status detected by the warming up status detector is equal to or higher than a threshold value set by the warming up completion threshold setter. The estimator is configured to estimate whether generated water is frozen in the fuel cell stack. The threshold changer is configured to change the threshold value set by the warming up completion threshold setter in accordance with a freezing state of the generated water in the fuel cell stack estimated by the estimator.