Fuel Cell Valve Adhesion Detection via Pressure Differential
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Solution Overview
Problem
Existing fuel cell systems with multiple tanks face challenges in detecting adhesion of switching valves, particularly in sub tanks, which can affect fuel economy and are difficult to diagnose without increasing vehicle weight or worsening fuel efficiency.
Innovation Solution
A method involving a fuel cell system with a main tank and a sub tank, where a pressure sensor is placed closer to the fuel cell than the second switching valve, allowing for adhesion detection based on pressure changes without additional sensors, using a double switching valve open state to determine adhesion and pressure reduction speed, facilitating quick and accurate diagnosis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a dedicated sensor (e.g., pressure sensor in the sub tank) is provided to determine whether the switching valve for the sub tank is operated normally, then the detection accuracy of switching valve adhesion is improved, but the vehicle weight increases and fuel economy deteriorates
Solution Approach 1:
The pressure sensor located in the supply channel is designed to serve multiple functions: it monitors fuel supply pressure during normal operation and simultaneously detects switching valve adhesion by analyzing pressure changes when the sub tank switching valve is activated. This multi-functional design eliminates the need for a dedicated sensor in the sub tank, reducing vehicle weight while maintaining detection accuracy
Solution Approach 2:
The supply channel acts as an intermediary medium that transmits pressure information from both the main tank and sub tank to a single pressure sensor. By positioning the sensor in the supply channel downstream of the sub tank switching valve, the system can detect valve adhesion through pressure differential analysis without requiring direct sensor placement in the sub tank
2Volume of moving object
If the volume of the sub tank is made small (30% or less of total volume) to minimize influence on the passenger compartment, then the passenger compartment space is preserved, but it becomes difficult to identify whether changes in fuel economy are due to load changes or malfunctioning of the switching valve
Solution Approach 1:
The system performs preliminary detection by activating the sub tank switching valve and monitoring the resulting pressure change in the supply channel before making a malfunction determination. This proactive approach allows the system to detect adhesion issues even when the sub tank volume is small, ensuring reliable diagnosis regardless of tank size
Solution Approach 2:
The system continuously monitors pressure changes in the supply channel and provides feedback to the control unit, which analyzes whether the pressure differential caused by sub tank activation falls within a predetermined range. This feedback mechanism enables accurate malfunction detection even with small sub tank volumes by comparing actual pressure responses against expected ranges
3Device complexity
If a pressure sensor is placed closer to the fuel cell than the second switching valve, then the detection of switching valve adhesion becomes possible using existing sensors, but the system complexity increases due to the need for precise sensor positioning and control logic
Solution Approach 1:
The system detects valve adhesion by monitoring changes in pressure parameters in the supply channel when the sub tank switching valve is activated. By analyzing the magnitude and timing of pressure differential changes, the system can distinguish between normal operation and adhesion conditions without requiring complex sensor configurations or additional measurement points
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 efficient detection of switching valve adhesion in multiple tanks without additional sensors, maintaining fuel economy and reducing vehicle weight, while allowing for external diagnostic verification, ensuring reliable fail-safe operation.
Implementation Method 1
a pressure sensor provided for the supply channel, being closer to the fuel cell than the second switching valve, to detect the pressure of the fuel gas
Data Source
AI summary
In a fuel cell system, an adhesion detection apparatus for detecting adhesion of a second switching valve for a sub tank is provided. The adhesion detection apparatus opens a first switching valve and a second switching valve for switching to a double switching valve open state where a fuel cell performs power generation, and thereafter, closes the first switching valve and opens the second switching valve for switching to a second switching valve open state where the fuel cell performs power generation, and detects adhesion of the second switching valve based on a change of a detection value of a pressure sensor in the second switching valve open state.