Fuel Cell High Potential Avoidance Control Logic
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Solution Overview
Problem
Existing fuel cell systems face inaccuracies in calculating high potential avoidance power, leading to insufficient application of high potential avoidance power when the power generation state is restored, resulting in potential errors and reduced durability of the fuel cell stack.
Innovation Solution
A fuel cell system with calculation, determination, and feedback control mechanisms that assess the operating state to prevent unnecessary updates of the integral term of feedback control, thereby accurately calculating high potential avoidance power by distinguishing between voltage decreases caused by temporary power generation changes and high potential avoidance effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If feedback control continuously updates the integral term to maintain high potential avoidance voltage, then voltage control responsiveness is improved, but calculation accuracy deteriorates due to unnecessary updates during temporary operating state changes
Solution Approach 1:
The control device determines whether the fuel cell stack is in a temporary operating state change condition before updating the integral term. By performing this preliminary check, the system avoids unnecessary updates during temporary changes while maintaining responsive control during normal operation, thus resolving the contradiction between responsiveness and accuracy
2Productivity
If high potential avoidance power is reduced when present voltage is lower than target voltage, then feedback control efficiency is improved, but durability protection deteriorates when power generation state is temporarily disrupted
Solution Approach 1:
The system performs preliminary determination of temporary operating state changes before adjusting high potential avoidance power. This prevents premature reduction of protection power during temporary disruptions, ensuring durability protection is maintained while still allowing efficiency improvements during stable operation
Solution Approach 2:
The control device maintains sufficient high potential avoidance power during temporary operating state changes as a protective measure. This beforehand cushioning ensures that when power generation state is temporarily disrupted, the fuel cell stack remains protected from high potential damage while the system recovers
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
Prevents unnecessary errors in calculating high potential avoidance power, ensuring accurate power calculation and improved durability of the fuel cell stack by distinguishing between temporary operating conditions and high potential avoidance effects.
Implementation Method 1
A fuel cell stack is a power generation system which oxidizes fuel by an electrochemical process to directly convert, into electric energy, energy discharged with the oxidizing reaction
Implementation Method 2
a polymer electrolyte membrane for selectively transporting hydrogen ions
Implementation Method 3
the catalyst layer containing, as a main component, carbon powder which carries a platinum-based metal catalyst
Data Source
AI summary
The present invention provides a system for a fuel cell vehicle, capable of preventing an unnecessary error in calculating high potential avoidance power to calculate power for high potential avoidance with high accuracy. A fuel cell system 100 includes: a fuel cell 20 that receives the supply of reactant gas to generate power; a secondary battery 50 for storing part of the power generated by the fuel cell 20; calculation means 60 which, when surplus power for high potential avoidance is added to the output voltage of the fuel cell 20 to avoid a high potential, calculates high potential avoidance voltage to avoid the high potential by feedback control based on a deviation between power generation voltage of the fuel cell 20 and high potential avoidance target voltage; determination means 70 for determining whether the operating state of the fuel cell 20 corresponds to a prohibition condition A to prohibit updating of an integral term of the feedback control or a permission condition; and feedback control condition deciding means 80 for stopping the updating of the integral term when the operating state corresponds to the prohibition condition A or updating the integral term when the operating state corresponds to the permission condition.