Fuel Cell Stack Control Method for Degradation Management
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Solution Overview
Problem
Fuel cell stacks in vehicles degrade over time, leading to reduced starting and overtaking performance, degraded vehicle drive-ability, and decreased system and fuel efficiency, with existing technologies failing to effectively manage this degradation.
Innovation Solution
A control method that monitors the state of the fuel cell stack, determines its degradation state, and adjusts the operation by stopping or restarting the stack accordingly, using a controller to maintain optimal performance and reduce high output usage, thereby preventing further degradation and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the fuel cell stack operates continuously to meet vehicle power demands, then the vehicle can maintain driving performance, but the degradation of the fuel cell stack accelerates
Solution Approach 1:
The control method implements periodic stopping and restarting of the fuel cell stack based on degradation state thresholds. When the degradation state reaches a predetermined threshold, the stack is stopped; when it recovers or the threshold is not met, the stack is restarted. This periodic operation pattern reduces continuous high-output usage, thereby slowing degradation while still meeting vehicle power demands through selective operation.
2Reliability
If the fuel cell stack is stopped frequently to prevent degradation, then the durability of the stack improves, but the vehicle starting and overtaking performance deteriorates
Solution Approach 1:
The control method continuously monitors the degradation state of the fuel cell stack and uses this feedback to make intelligent stopping/restarting decisions. The degradation state is calculated based on operational parameters, and this real-time feedback enables the system to stop the stack only when necessary to prevent excessive degradation, while maintaining it operational when vehicle performance requirements demand high output, thus balancing durability with performance.
3Power
If the fuel cell stack operates at high output to meet peak power demands, then the vehicle can achieve required acceleration and overtaking, but the system efficiency and fuel efficiency decrease
Solution Approach 1:
The control method dynamically adjusts the operating state of the fuel cell stack based on real-time degradation state assessment. Instead of operating at fixed high output levels, the system dynamically switches between stopped and running states, and adjusts output levels according to the calculated degradation state. This dynamic control enables the stack to operate more efficiently at moderate loads when possible, reducing energy losses while still meeting peak power demands when necessary.
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 control method ensures vehicle starting and overtaking performance, prevents drive-ability degradation, and enhances system and fuel efficiency by optimizing fuel cell operation based on the stack's degradation state, while reducing auxiliary machinery energy consumption and noise.
Implementation Method 1
a fuel cell is a generator in which a fuel gas and an oxidant gas react electrochemically and then the chemical energy of a fuel is converted into electricity
Data Source
AI summary
The present disclosure relates to a control method for a fuel cell. The control method includes: collecting, by a controller, state information of a fuel cell (FC) stack; determining, by the controller, a degradation state of the FC stack from the collected state information of the FC stack; correcting, by the controller, a basic threshold output corresponding to a present driving state of a vehicle on the basis of information of the determined degradation state of the FC stack; comparing, by the controller, a post-correction threshold output that is obtained by correcting the basic threshold output and a motor demand output, and determining, by the controller, stopping or restarting of a fuel cell; and controlling, by the controller, such that the determined stopping or restarting state of the fuel cell is achieved.