Fuel Cell Valve Gain Control for Pressure Stability
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Solution Overview
Problem
Fuel cell systems face challenges in maintaining stable pressure control, leading to chattering phenomena and increased current consumption due to frequent adjustments of the fuel supply valve, especially when the actual pressure reaches a steady state.
Innovation Solution
Implementing a controller that adjusts the gain of the fuel supply valve based on the state of the actual pressure, applying a smaller gain when the pressure is in a steady state to reduce chattering and maintain stability, and switching to a higher gain when the pressure difference exceeds a threshold, while also integrating differences to determine controlled variables and adjusting the purge valve for efficient fuel discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the fuel supply valve is frequently adjusted to maintain target pressure, then the pressure control responsiveness is improved, but the chattering phenomenon increases and current consumption increases
Solution Approach 1:
The controller dynamically adjusts the gain of the fuel supply valve based on the operating state. When the actual pressure is far from target pressure, a higher gain is applied for rapid response. When the actual pressure approaches target pressure, a lower gain is applied to reduce chattering and current consumption. This dynamic gain adjustment resolves the contradiction between responsiveness and energy loss.
Solution Approach 2:
The controller changes the gain parameter of the fuel supply valve according to the pressure difference between actual and target pressure. By modifying this control parameter based on system state, the controller achieves high responsiveness when needed while minimizing energy consumption during steady-state operation, thus resolving the technical contradiction.
2Manufacturing precision
If the fuel supply valve is frequently adjusted to maintain target pressure, then the pressure control precision is improved, but the durability of the fuel supply valve deteriorates
Solution Approach 1:
The controller implements dynamic gain adjustment where the fuel supply valve gain is reduced when the actual pressure approaches the target pressure. This reduces the frequency of valve adjustments during steady-state operation, thereby maintaining pressure control precision while extending valve durability and resolving the contradiction between precision and reliability.
Solution Approach 2:
By changing the gain parameter based on the pressure difference state, the controller achieves precise pressure control when the difference is large while reducing adjustment frequency when the difference is small, thus protecting valve durability without sacrificing control precision.
3Speed
If a higher gain is applied to the fuel supply valve, then the speed of reaching target pressure is improved, but the chattering phenomenon increases when steady state is reached
Solution Approach 1:
The controller dynamically switches between high gain and low gain modes based on the pressure difference. High gain is used when the actual pressure is far from target pressure to achieve fast response. When the actual pressure approaches target pressure, the controller transitions to low gain mode to eliminate chattering and maintain pressure stability, thus resolving the contradiction between speed and stability.
Solution Approach 2:
The controller changes the gain parameter according to the system state - using high gain for rapid pressure adjustment and low gain for stable steady-state maintenance. This parameter switching strategy resolves the contradiction between reaching target pressure quickly and maintaining stable pressure without chattering.
Data Source
AI summary
A fuel cell system and method of controlling the fuel cell system are provided. The fuel cell system includes a fuel cell stack that is configured to receive fuel, and generate electric energy and a fuel supply valve that is configured to adjust pressure of fuel that is supplied to the fuel cell stack. A controller is configured to operate the fuel supply valve to supply fuel of predetermined target pressure to the fuel cell stack, using a difference between the predetermined target pressure and actual pressure of the fuel being supplied. When the actual pressure reaches a steady state from a transient state, the controller applies a smaller gain than in the transient state to determine a first controlled variable based on the difference between the target pressure and the actual pressure of the fuel being supplied.