Hydrogen Cut-Off Valve Control for Fuel Cell Vehicles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In fuel cell systems, existing methods fail to promptly detect and address abnormal states in hydrogen supply lines, leading to potential damage and abrupt system shutdowns due to abnormally closed hydrogen cut-off valves, which can result in safety risks and inefficiencies.
Innovation Solution
A method that measures the duty applied to the hydrogen supply valve and compares it with a predetermined value to determine if the hydrogen supply line is abnormal, and if so, opens the hydrogen cut-off valve to prevent damage, while also monitoring line pressure to identify other potential issues and alert the user.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hydrogen cut-off valve is installed on the hydrogen supply line to ensure safety, then safety of the high-pressure hydrogen system is improved, but device complexity increases due to additional valve components and monitoring requirements
Solution Approach 1:
The patent combines the hydrogen cut-off valve control function with the existing hydrogen supply valve control system. The controller that already manages the hydrogen supply valve is extended to also monitor the cut-off valve status and trigger emergency closing when abnormalities are detected. This merging approach adds safety functionality without requiring a completely separate control system, thereby improving safety while minimizing the increase in device complexity.
Solution Approach 2:
The controller acts as an intermediary that monitors the duty cycle of the hydrogen supply valve and the opening/closing status of the cut-off valve. When the controller detects that the supply valve duty exceeds a predetermined threshold or that the cut-off valve fails to close properly, it triggers an emergency closing command. This intermediary control mechanism enables coordinated safety management of both valves through a centralized control logic.
2Reliability
If the hydrogen cut-off valve is monitored using anode pressure monitoring or separate determination methods, then abnormal closure detection is achieved, but response time is delayed and system shutdown occurs abruptly
Solution Approach 1:
The system performs preliminary monitoring of the hydrogen supply valve duty cycle to detect potential abnormalities before they lead to complete system failure. By continuously monitoring the duty parameter and comparing it against predetermined thresholds, the system can identify trends indicating potential cut-off valve malfunction and take preventive action before an actual abnormal closure occurs, thereby reducing response time and avoiding abrupt shutdowns.
Solution Approach 2:
The controller implements a feedback mechanism that continuously monitors the duty cycle of the hydrogen supply valve and the status of the cut-off valve. When the duty exceeds a predetermined threshold or when abnormal closure is detected, the controller provides immediate feedback by triggering an emergency closing command. This closed-loop feedback system enables rapid detection and response to abnormal conditions, minimizing response time and preventing abrupt system shutdowns.
3Productivity
If the hydrogen supply valve duty is increased to maintain hydrogen flow, then hydrogen supply to the fuel cell stack is improved, but the risk of abnormal closure and system damage increases
Solution Approach 1:
The system allows the hydrogen supply valve duty to exceed normal operating thresholds when necessary to maintain adequate hydrogen supply to the fuel cell stack, but implements protective measures through continuous monitoring. When the duty reaches a predetermined threshold level, the system triggers emergency closing of the cut-off valve to prevent potential damage from abnormal conditions. This approach enables partial excessive action (higher duty cycles) while maintaining system reliability through protective thresholds and monitoring.
Data Source
AI summary
A method is provided for controlling a hydrogen cut-off valve, which may be provided on a hydrogen supply line of a fuel cell system, in driving a fuel cell vehicle mounted with a hydrogen supply line including a high-pressure tank storing hydrogen, a hydrogen supply valve, and a hydrogen cut-off valve. The method includes: a step (a) of measuring a duty applying to the hydrogen supply valve and a step (b) of comparing the duty with a predetermined duty, in which when the duty is equal to or more than the predetermined duty, it is determined that the hydrogen supply line between the high-pressure tank and the hydrogen supply valve is abnormal.