Fuel Cell Hydrogen Valve Calibration Using Rising Current
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Solution Overview
Problem
Existing fuel cell systems face challenges in accurately calculating the characteristics of solenoid valves due to variations in manufacturing and aging, which affect the control of hydrogen gas supply, leading to inefficiencies in power generation.
Innovation Solution
A fuel cell system that includes a control circuit to detect and calculate the increase and decrease characteristics of a solenoid valve's electric current and pressure relationship, allowing for precise correction of standard characteristics based on actual measurements, thereby improving the control of hydrogen gas supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the initial drive amount is corrected based on measured electric current values at target pressure, then the control precision of solenoid valve is improved, but the complexity of measurement and correction process increases
Solution Approach 1:
The patent changes the measurement parameter from electric current at target pressure to rising current at constant differential pressure. This parameter transformation simplifies the measurement process while maintaining correction effectiveness, as the rising current directly reflects the solenoid valve's opening characteristics under representative operating conditions
Solution Approach 2:
The patent extracts the essential characteristic of solenoid valve performance by measuring only the rising current at a specific differential pressure point, rather than requiring comprehensive measurement across multiple pressure points. This extraction of the critical parameter simplifies the correction process while capturing the dominant variation in valve characteristics
2Measurement precision
If the initial drive amount is corrected for each differential pressure, then the accuracy of pressure control is improved, but the complexity of correction process increases
Solution Approach 1:
The patent transforms the correction approach by using rising current at constant differential pressure as the correction parameter, rather than correcting for each differential pressure point. This parameter change reduces the correction process to a single representative measurement that captures the solenoid valve's characteristic variations
Solution Approach 2:
The measured rising current at a specific differential pressure serves as a universal correction parameter that can be applied across different operating conditions. This single measurement captures the essential valve characteristics and enables accurate control throughout the operating range, reducing the need for multiple condition-specific corrections
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
Enables accurate control of hydrogen gas pressure, enhancing power generation efficiency and stability by aligning the solenoid valve characteristics with actual operational conditions.
Implementation Method 1
a solenoid valve configured to change an opening degree of the hydrogen gas supply passage
Implementation Method 2
a pressure sensor configured to detect a pressure in a downstream supply passage
Data Source
AI summary
A fuel cell system may include: a fuel cell; a hydrogen gas supply passage; a solenoid valve that changes an opening degree of the hydrogen gas supply passage; a pressure sensor that detects a pressure in a downstream supply passage being a part of the hydrogen gas supply passage from the solenoid valve to the fuel cell; and a control circuit. The control circuit detects a rise in the pressure detected by the pressure sensor when increasing a conducted electric current conducted in the solenoid valve from a state where the solenoid valve is closed, and detection of a rising current which is the conducted electric current at a time of the rise in the pressure; and calculates an increase characteristic based on the rising current, the increase characteristic being a relationship between the conducted electric current and the pressure when the conducted electric current increases.