Fuel Cell Power Threshold Control for Temperature-Induced Fluctuations
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Solution Overview
Problem
Fuel cell systems face challenges in maintaining optimal temperature ranges due to limitations in cooling and warm-up performance, leading to potential high or low temperature operations that cause power fluctuations and performance degradation, which can result in reduced drivability and ineffective prevention of deterioration.
Innovation Solution
A method for controlling fuel cell power by adjusting power threshold values based on temperature ranges, with specific reductions and increases at predetermined temperatures, and adjusting these ranges based on external factors like vehicle speed and outdoor temperature to maintain consistent power limits and prevent sudden power changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power is limited based on temperature to prevent high temperature operation, then fuel cell deterioration is prevented, but power output is reduced and drivability is degraded
Solution Approach 1:
The power threshold is dynamically adjusted based on temperature conditions. When temperature exceeds the high temperature range, the power threshold is reduced from an initial value to a reduced value, allowing the system to adapt power output to thermal conditions while maintaining drivability through controlled transitions
Solution Approach 2:
The system performs preliminary cooling actions before power limitation is triggered. When temperature enters the high temperature range, the power threshold is reduced in advance, and cooling control is activated to prevent temperature from reaching levels that would cause immediate power cutoff, thereby maintaining power output longer
2Reliability
If power threshold is reduced when temperature increases to prevent deterioration, then fuel cell performance is maintained, but sudden power changes occur reducing drivability
Solution Approach 1:
The system applies beforehand cushioning by reducing the power threshold in advance when temperature enters the high temperature range, and by controlling the rate of power reduction. This cushioning approach prevents sudden power drops by gradually adjusting power output while cooling control is activated, thereby maintaining power stability during temperature transitions
3Temperature
If cooling control is enhanced to maintain temperature in acceptable range, then high temperature operation is prevented, but cooling performance limitations cause temperature to still reach high temperature region
Solution Approach 1:
The system performs preliminary power threshold reduction when temperature enters the high temperature range, before temperature reaches levels that would cause immediate power cutoff. This preliminary action allows cooling control more time to respond and prevents temperature from reaching critical levels, thereby improving temperature management effectiveness
Solution Approach 2:
The system uses feedback control by continuously monitoring temperature and adjusting power threshold accordingly. When temperature exceeds the high temperature range, the power threshold is reduced, and this adjustment is based on feedback from temperature sensors, creating a closed-loop control system that improves temperature management
Data Source
AI summary
A system and method for controlling power of a fuel cell for a vehicle are provided. The method includes measuring a temperature of the fuel cell and when the measured temperature of the fuel cell is within a high temperature range in which a power threshold value of the fuel cell is reduced based on an increase in temperature of the fuel cell and when the measured temperature of the fuel cell is increased and then is equal to or greater than a predetermined temperature a power threshold value is reduced from a power value at the predetermined temperature. The high temperature range is a range between a third temperature at which the power threshold value starts to be reduced based on the increase in temperature of the fuel cell and a fourth temperature at which the power threshold value is reduced and then reaches the minimum power threshold value.