Fuel Cell Air Valve Control Stabilization
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Solution Overview
Problem
In fuel cell systems, the variation in pressure between the valve disc and seal member due to environmental or manufacturing differences leads to unstable feedback control of valve opening degree, resulting in overshoot beyond target values during system activation and potential valve disc collision during reactivation.
Innovation Solution
A fuel cell system with a control device that measures valve opening degree and calculates a command value based on target electric power generation, executing feedback control only when specific threshold conditions are not met, thereby stabilizing valve operation and preventing overshoot and collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If feedback control is executed continuously to maintain valve opening degree, then control responsiveness is improved, but overshoot occurs during activation due to tension force variation
Solution Approach 1:
The control device determines whether to execute feedback control in advance based on the operating state of the valve and fuel cell system. By predicting the risk of overshoot before it occurs and selectively enabling feedback control only when safe, the system prevents instability while maintaining responsiveness when conditions permit.
2Measurement precision
If feedback control is executed to adjust valve opening degree accurately, then flow rate control precision is improved, but valve disc collision occurs during reactivation
Solution Approach 1:
The control device applies preliminary anti-action by determining the safety of feedback control execution before actually executing it. When the valve is in a vulnerable state (fully closed or fully open), the control device prohibits feedback control to prevent the harmful effect of valve disc collision, while allowing precise control when the valve is in safe intermediate positions.
3Reliability
If valve tension force is increased to improve sealing property, then sealing performance is improved, but feedback control stability deteriorates due to excessive pressure
Solution Approach 1:
The control device dynamically adjusts the execution of feedback control based on real-time valve operating conditions. Rather than using fixed control parameters, the system adapts by enabling or disabling feedback control according to the valve's current state, accounting for variations in tension force that affect both sealing and control stability.
Data Source
AI summary
A control device of a fuel cell system does not execute feedback control of an air valve in a case where a first condition in which a valve opening degree command value calculated by the control device is less than a command value threshold and a second condition in which a valve opening degree measurement value measured by an air valve opening degree sensor is less than a measurement value threshold are satisfied, and executes the feedback control of the air valve in a case where the first condition or the second condition is not satisfied.