Hydrogen Purge Valve Mapping for Stable Fuel Cell Stack Discharge
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Solution Overview
Problem
Conventional hydrogen purge systems in fuel cell systems struggle to maintain a constant hydrogen purge amount across varying differential pressures between the anode and cathode, leading to excessive hydrogen consumption and errors in estimating hydrogen concentration.
Innovation Solution
A hydrogen purge system that adjusts the opening degree of the purge valve using current control or PWM control based on differential pressure, ensuring a constant hydrogen purge amount regardless of the purge flow path size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the hydrogen purge flow path size is increased to discharge more hydrogen when differential pressure is high, then the hydrogen purge amount increases, but hydrogen consumption increases excessively and estimation error increases
Solution Approach 1:
The purge valve opening degree is made dynamically adjustable through current control or PWM control based on real-time differential pressure measurements. The controller adjusts the opening degree to maintain constant hydrogen purge amount across varying differential pressure conditions, preventing excessive hydrogen consumption while ensuring adequate purge when needed.
Solution Approach 2:
The system changes the opening degree parameter of the purge valve based on differential pressure conditions. By adjusting this parameter dynamically, the system maintains optimal hydrogen purge amount regardless of whether the differential pressure is high or low, thereby preventing excessive hydrogen consumption during high pressure conditions.
2Loss of substance
If the hydrogen purge flow path size is decreased to reduce hydrogen consumption, then hydrogen consumption decreases, but water discharge decreases and flooding occurs
Solution Approach 1:
The purge valve opening degree is dynamically adjusted based on differential pressure and water accumulation conditions. When differential pressure is low but water discharge is needed, the controller increases the opening degree to prevent flooding, while maintaining low hydrogen consumption during normal operating conditions.
Solution Approach 2:
The controller uses feedback from differential pressure sensors and water accumulation detection to adjust the purge valve opening degree. This feedback mechanism ensures that the valve opens sufficiently to discharge water when needed, preventing flooding, while closing appropriately to minimize hydrogen consumption during normal operation.
3Device complexity
If a fixed size hydrogen purge flow path is used, then the device complexity is reduced, but the hydrogen purge amount cannot be maintained constant across different differential pressures
Solution Approach 1:
Instead of a fixed-size flow path, the system uses a dynamically adjustable opening degree controlled by current control or PWM control. This dynamic adjustment mechanism maintains constant hydrogen purge amount across varying differential pressure conditions without requiring a complex variable geometry flow path structure.
Solution Approach 2:
The system changes the opening degree parameter of the purge valve based on differential pressure measurements. This parameter change approach maintains stable hydrogen purge amount consistency across different operating conditions without requiring a fundamentally complex valve structure.
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
Maintains consistent hydrogen purge amounts across different differential pressures, preventing excessive hydrogen consumption and minimizing errors in hydrogen concentration estimation, while also preventing flooding phenomena in the fuel cell stack.
Implementation Method 1
a coil that is mounted on the inner diameter of the drive unit case, and to which current is applied by the current control or PWM control of the controller
Data Source
AI summary
An embodiment of the present disclosure provides a hydrogen purge system and a method for controlling the same, which are capable of maintaining the hydrogen purge amount constant based on differential pressure between an anode and a cathode, regardless of the size of a hydrogen purge flow path of a purge valve, by allowing the opening degree of the purge valve to the hydrogen purge flow path to be adjusted by a current control or PWM control according to a mapping of the differential pressure between the anode and the cathode of a fuel cell stack.