Hydrogen Pressure Sensor Offset Correction for Fuel Cell Startup
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fuel cell systems face challenges in maintaining hydrogen pressure sensor accuracy and stability due to offset issues, particularly when the sensor is neglected for long periods, leading to potential reverse voltage risks and excessive starting times, which are not effectively addressed by current offset correction methods that require opening the drain valve.
Innovation Solution
A method and system that determine the need for offset correction based on stop time and output voltage, calculate an offset correction value by constantly supplying hydrogen, and apply it to ensure safe starting of the fuel cell stack without opening the drain valve, thus maintaining hydrogen control accuracy and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the drain valve is opened to correct offset, then the offset correction can be performed, but hydrogen emission regulations are violated and starting time increases
Solution Approach 1:
The system performs preliminary offset correction by constantly supplying hydrogen to the fuel cell stack before normal operation begins. The controller calculates the offset correction value based on the difference between expected and actual voltage during this preliminary hydrogen supply phase, eliminating the need to open the drain valve during actual starting.
Solution Approach 2:
The patent uses voltage measurement as an intermediary parameter to indirectly determine offset. Instead of directly measuring pressure offset by opening the drain valve, the system measures voltage deviation during hydrogen supply and calculates the corresponding pressure offset correction value, avoiding direct drain valve operation.
2Measurement precision
If the drain valve is opened to correct offset, then the offset correction can be performed, but hydrogen emission regulations are violated
Solution Approach 1:
The patent extracts the offset correction function from the drain valve operation. Instead of using the drain valve to equalize pressure for offset correction, the system separates the correction process by using voltage measurement during controlled hydrogen supply to calculate offset, completely avoiding drain valve opening and associated hydrogen emissions.
Solution Approach 2:
The patent replaces the mechanical drain valve opening operation with an electrical measurement-based calculation system. The controller uses voltage signals from the fuel cell stack during hydrogen supply to compute the offset correction value, substituting mechanical pressure equalization with electrical measurement and calculation.
3Measurement precision
If offset correction is performed using related art methods, then some correction effect is achieved, but it is ineffective when the fuel cell starts after long period neglect
Solution Approach 1:
The system dynamically adjusts the offset correction approach based on operational conditions. The controller determines whether offset correction is needed by evaluating voltage deviation during hydrogen supply, and only performs correction when actually required, making the system adaptive to different operational states including long-term neglect scenarios.
Solution Approach 2:
The system implements feedback by continuously monitoring voltage during hydrogen supply and comparing it with expected values. The offset correction value is calculated based on this feedback, and the corrected offset is applied to improve subsequent measurement accuracy, creating a closed-loop correction mechanism.
Data Source
AI summary
Provided are a method and system for correcting an offset of a hydrogen pressure sensor. The method includes constantly supplying the hydrogen to the fuel cell stack, determining whether an offset of the hydrogen pressure sensor needs to be corrected based on a stop time before the fuel cell stack starts and a magnitude of an output voltage of the fuel cell stack, calculating an offset correction value when the offset of the hydrogen pressure sensor needs to be corrected, and correcting the offset of the hydrogen pressure sensor and performing the starting of the fuel cell stack.