Fuel Cell Hydrogen Estimation With Degradation-Corrected Crossover
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Solution Overview
Problem
Conventional hydrogen concentration estimation methods for fuel cells do not accurately account for degradation, leading to insufficient or excessive hydrogen levels, which can cause durability issues and reduced fuel cell efficiency.
Innovation Solution
A system and method that includes a controller to estimate hydrogen concentration by cutting off the discharge valve, determining gas discharge amounts, and correcting the crossover coefficient value based on degradation levels, ensuring accurate hydrogen concentration estimation within the fuel cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional hydrogen concentration estimation is performed without checking fuel cell degradation, then the control system is simple and easy to operate, but the hydrogen concentration estimation accuracy deteriorates leading to insufficient or excessive hydrogen levels
Solution Approach 1:
The system performs preliminary degradation detection by closing the discharge valve and measuring pressure change rates before conducting hydrogen concentration estimation. This preliminary action allows the system to identify degradation states and select appropriate estimation methods, thereby improving accuracy without significantly increasing operational complexity during normal hydrogen concentration control
Solution Approach 2:
The system changes the operating parameter by closing the discharge valve temporarily to create a closed system for degradation detection. This parameter change enables measurement of pressure change rates that indicate degradation levels, which then informs the selection of appropriate hydrogen concentration estimation methods for different degradation states
2Reliability
If hydrogen concentration is controlled without considering fuel cell degradation level, then the control process is simple, but the fuel cell durability deteriorates due to insufficient hydrogen levels causing degradation
Solution Approach 1:
The system implements feedback by continuously monitoring pressure change rates to detect degradation and using this information to adjust hydrogen concentration estimation and control strategies. This feedback mechanism ensures that hydrogen supply is appropriately adjusted based on actual fuel cell condition, protecting durability while maintaining reasonable control complexity through automated adaptation
3Loss of energy
If hydrogen concentration is overestimated due to undetected degradation, then the control system operates simply, but fuel economy deteriorates due to excessive hydrogen supply
Solution Approach 1:
The system performs preliminary degradation detection before hydrogen concentration estimation by measuring pressure change rates in a closed system. This preliminary assessment allows the control system to select appropriate estimation methods and correction factors, preventing overestimation and excessive hydrogen supply while maintaining efficient operation during normal control phases
Solution Approach 2:
The system changes the measurement approach by temporarily closing the discharge valve to measure pressure change rates, which provides information about degradation and crossover effects. This parameter change enables more accurate hydrogen concentration estimation that accounts for degradation, thereby improving fuel economy without requiring continuous complex intervention
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
Enhances the accuracy of hydrogen concentration estimation, preventing insufficient hydrogen levels and reducing fuel cell degradation, thereby maintaining durability and efficiency.
Implementation Method 1
a fuel cell configured to produce electrical energy using chemical reaction of hydrogen and oxygen supplied thereto
Implementation Method 2
oxidation of the supplied hydrogen proceeds at the hydrogen electrode, hydrogen ions and electrons are generated
Implementation Method 3
The generated hydrogen ions and electrons migrate to an air electrode through an electrolyte membrane and a separation plate, respectively
Implementation Method 4
a discharge valve provided at the discharge line and configured to adjust the communication between the fuel cell and the exterior of the fuel cell
Data Source
AI summary
A system and a method for estimating a hydrogen concentration of a fuel cell include the fuel cell, a discharge line connected to an outlet side of a fuel cell hydrogen electrode while connecting the fuel cell to an exterior of the fuel cell, for communication between the fuel cell and the exterior of the fuel cell, a discharge valve provided at the discharge line and configured to adjust the communication between the fuel cell and the exterior of the fuel cell, and a controller configured to cut off the discharge valve during operation of the fuel cell, to check occurrence of degradation of the fuel cell, and to correct a crossover coefficient value of the fuel cell in accordance with a level of the degradation in the fuel cell when the degradation of the fuel cell has occurred, estimating a hydrogen concentration in an interior of the fuel cell.