Fuel Cell Hydrogen Pressure Correction With Air Cutoff Validation
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Solution Overview
Problem
The existing hydrogen supply systems for fuel cells face challenges in precisely controlling the pressure of the hydrogen supply line due to deviations in the sensing value of the hydrogen supply pressure sensor, leading to excessive or insufficient hydrogen supply, especially when the discharge valve experiences clogging, insufficient opening, or freezing.
Innovation Solution
A hydrogen supply system and control method where hydrogen is supplied after air supply is cut off, measuring pressure variations in the hydrogen supply line, and determining whether to use the correction value of the hydrogen supply pressure sensor based on these variations, using a controller that reflects a correction factor depending on the discharge valve's state to adjust the hydrogen supply accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the correction value of the hydrogen supply pressure sensor is derived by opening the discharge line, then the sensing value deviation can be corrected, but the correction value does not reflect discharge valve failures such as clogging, insufficient opening, or freezing
Solution Approach 1:
The system performs preliminary actions by cutting off air supply before deriving the correction value, creating a controlled environment where hydrogen supply and discharge are isolated. This preliminary setup allows accurate measurement of pressure variations that directly reflect the actual hydrogen supply line conditions, ensuring the correction value reliably represents the true pressure sensor deviation even when discharge valve failures occur.
Solution Approach 2:
The system implements feedback by measuring pressure variations in the hydrogen supply line after deriving the correction value and using this measured variation to determine whether to apply the correction value. The controller continuously monitors pressure changes and adjusts hydrogen supply accordingly, creating a closed-loop control system that validates correction value applicability in real-time and prevents erroneous corrections when discharge valve failures are detected.
2Manufacturing precision
If the correction value is used to control hydrogen supply pressure, then precise pressure control can be achieved, but excessive or insufficient hydrogen supply occurs when discharge valve fails
Solution Approach 1:
The system applies dynamics by making the correction value application conditional rather than fixed. The controller dynamically determines whether to apply the correction value based on real-time pressure variation measurements and discharge valve status. This dynamic approach allows the system to switch between corrected and uncorrected pressure control modes, maintaining reliable hydrogen supply even when discharge valve failures occur.
Solution Approach 2:
The system uses feedback control by continuously monitoring pressure variations in the hydrogen supply line and using this information to determine correction value applicability. The controller measures pressure changes, compares them against expected ranges, and adjusts hydrogen supply accordingly, ensuring stable and reliable pressure control that adapts to discharge valve failure conditions.
3Measurement precision
If the discharge line is opened for correction value determination, then sensor deviation can be measured, but the correction does not account for discharge valve clogging or freezing
Solution Approach 1:
The system performs preliminary air supply cutoff to isolate the hydrogen supply line from the discharge line before measuring pressure variations. This preliminary action ensures that pressure measurements reflect only hydrogen supply line conditions and are not influenced by discharge valve status, allowing accurate sensor calibration that is adaptable to various discharge valve failure conditions.
Solution Approach 2:
The system implements feedback by measuring pressure variations after correction value determination and using this information to assess whether the correction value is applicable. The controller continuously monitors system conditions and adjusts correction value usage based on detected discharge valve failures, making the correction method adaptable to clogging, freezing, or other valve malfunctions.
Data Source
AI summary
A hydrogen supply system for a fuel cell and a control method thereof includes a fuel cell, a hydrogen supply line connected to an inlet side of an anode of the fuel cell and supplying hydrogen to the fuel cell, a hydrogen supply pressure sensor configured for measuring pressure of the hydrogen supply line, and a controller electrically connected to the hydrogen supply pressure sensor and configured for deriving a correction value of the hydrogen supply pressure sensor, supplying hydrogen after air supply is cut off during an operation of the fuel cell, measuring a pressure variation of the hydrogen supply line, and determining whether to use a correction value of the hydrogen supply pressure sensor based on the measured pressure variation.