Fuel Cell Cooling Control Using Output Degradation Prediction
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Solution Overview
Problem
Fuel cells in vehicles deteriorate over time, leading to a decrease in rated output, necessitating control strategies that consider the degree of deterioration to maintain performance.
Innovation Solution
An information processing device predicts output decrease amounts in fuel cells by analyzing use history data, adjusting refrigerant flow rates or temperatures based on derived output decrease factors to mitigate deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the fuel cell is used continuously to maintain vehicle operation, then the vehicle can operate without interruption, but the fuel cell deteriorates and output decreases
Solution Approach 1:
The system performs preliminary actions by predicting future output decrease amounts based on use history information before actual deterioration occurs. The derivation unit calculates output decrease amounts for multiple items (operation time, start-stop cycles, voltage fluctuations) and uses these predictions to proactively adjust control strategies, preventing severe deterioration rather than reacting to it.
Solution Approach 2:
The system implements feedback control by continuously monitoring use history information, deriving current output decrease amounts, and adjusting control parameters based on these derived values. The control unit receives feedback about the fuel cell's actual state through the derivation unit's calculations and modifies operation parameters accordingly to maintain reliability.
2Reliability
If the refrigerant flow rate is increased to cool the fuel cell, then the fuel cell temperature decreases and deterioration is reduced, but energy consumption increases
Solution Approach 1:
The system dynamically adjusts the refrigerant flow rate based on real-time derivation of output decrease amounts. Rather than maintaining a constant high flow rate, the pump control is dynamically optimized according to the fuel cell's actual deterioration state, use history, and thermal conditions, achieving reliable cooling while minimizing energy consumption.
Solution Approach 2:
The control unit changes the refrigerant flow rate parameter based on derived output decrease amounts and temperature conditions. When the fuel cell requires more cooling (higher output decrease or higher temperature), the flow rate parameter is increased; when cooling demand is lower, the parameter is reduced to save energy.
3Reliability
If the refrigerant temperature is decreased to improve cooling efficiency, then the fuel cell is cooled more effectively, but the risk of freezing and performance degradation increases
Solution Approach 1:
The system adjusts the refrigerant temperature parameter within an optimized range based on derived output decrease amounts and actual fuel cell temperature. The control unit balances cooling efficiency with freezing prevention by modifying the temperature parameter dynamically, ensuring the refrigerant is cold enough to cool effectively but not so cold as to cause freezing or performance degradation.
4Power
If the fuel cell operates at high output to meet vehicle power demands, then the vehicle performance is improved, but the rate of fuel cell deterioration accelerates
Solution Approach 1:
The system performs preliminary prediction of output decrease amounts based on use history information before high-power operation causes severe deterioration. By analyzing operation time, start-stop cycles, and voltage fluctuations, the system predicts future output loss and adjusts control strategies in advance to balance power delivery with deterioration prevention.
Solution Approach 2:
The control unit receives feedback about the fuel cell's actual state through continuous monitoring of use history and derived output decrease amounts. When the feedback indicates accelerated deterioration trends, the control unit adjusts power output parameters to prevent further rapid degradation while still meeting vehicle power demands when conditions allow.
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
The solution ensures fuel cell output while reducing deterioration by optimizing refrigerant management, thereby maintaining performance and extending the fuel cell's lifespan.
Implementation Method 1
a refrigerant pump 90 for circulating the refrigerant... control to increase a flow rate of a pump for supplying a refrigerant to the fuel cell... control to decrease a target temperature of the refrigerant that cools the fuel cell
Data Source
AI summary
An information processing device includes an acquisition unit which acquires use history information indicating a use history of a vehicle for a plurality of items, a derivation unit which derives the output decrease amount for each of the items based on use history information and output decrease characteristic information, a factor-specific output decrease amount estimation unit which estimates the output decrease amount for each of output decrease factors based on the output decrease amount for each of the items and output decrease factor information, and a control unit which executes control to increase a flow rate of a pump when any one of output decrease amounts for each of the output decrease factors is equal to or larger than a threshold value, compared with when where all of the output decrease amounts for each of the output decrease factors are less than the threshold value.