Fuel Cell Stack Emergency Control via Valve Failure Compensation
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Solution Overview
Problem
The performance of a fuel cell stack in a fuel cell vehicle is degraded when the purge valve and drain valve fail, necessitating a technique to secure stability for emergency driving.
Innovation Solution
An apparatus and method that include a failure detector, a determination portion, and a controller to adjust operating parameters such as pressure, temperature, and current of the fuel cell stack when valve failures occur, specifically increasing operating temperature, air stoichiometry, and pressure to maintain stack stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the purge valve and drain valve are used to maintain fuel cell stack performance, then the concentration of hydrogen and water management are improved, but the system reliability deteriorates when the valves fail
Solution Approach 1:
The patent changes operating parameters (temperature, pressure, current) of the fuel cell stack in response to valve failures. When a valve failure is detected, the controller adjusts these parameters to compensate for the loss of purge and drain functions, thereby maintaining stack performance without requiring additional hardware components.
Solution Approach 2:
The fuel cell stack performs self-diagnosis through voltage measurement to detect its own performance degradation caused by valve failures. The system then self-corrects by automatically adjusting operating parameters through the controller, eliminating the need for external intervention or complex additional monitoring systems.
2Duration of action of moving object
If the purge valve and drain valve are operated normally, then water and gas management are maintained, but the available time for emergency driving is reduced when valve failures occur
Solution Approach 1:
The system performs preliminary detection of valve failures and proactively adjusts operating parameters before the fuel cell stack performance degrades completely. By measuring voltages and detecting failures early, the controller can preemptively change temperature, pressure, and current settings to extend the time available for emergency driving.
Solution Approach 2:
The system continuously monitors fuel cell stack voltages to detect valve failure conditions and uses this feedback to dynamically adjust operating parameters. This closed-loop control enables the system to respond to valve failures in real-time, extending the duration of safe emergency driving operation.
3Stability of the object's composition
If the operating parameters of the fuel cell stack are adjusted to compensate for valve failures, then the stability of the fuel cell stack is maintained, but the control complexity increases
Solution Approach 1:
The fuel cell stack performs self-diagnosis through voltage measurement to detect its own performance degradation caused by valve failures. The system then self-corrects by automatically adjusting operating parameters through the controller, eliminating the need for external intervention or complex additional monitoring systems.
Solution Approach 2:
The patent changes operating parameters (temperature, pressure, current) of the fuel cell stack in response to valve failures. When a valve failure is detected, the controller adjusts these parameters to compensate for the loss of purge and drain functions, thereby maintaining stack performance without requiring additional hardware components.
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
The solution effectively prevents degradation of the fuel cell stack performance, ensuring the vehicle can perform emergency driving by controlling operating conditions when purge and drain valves fail, thereby extending the available time for safe operation.
Implementation Method 1
a fuel cell system is a type of power generation system that generates electrical energy through an electrochemical reaction between hydrogen and oxygen (in the air)
Implementation Method 2
The MEA includes an electrolyte membrane which allows hydrogen ions to move
Implementation Method 3
oxygen and nitrogen in the air electrode move to the hydrogen electrode due to a difference in concentration through the electrolyte membrane
Implementation Method 4
water which is produced on the air electrode due to a reaction in the fuel cell may move to the hydrogen electrode due to back-diffusion
Data Source
AI summary
An apparatus configured for controlling emergency driving for a fuel cell vehicle may include a failure detector configured to detect whether a purge valve and a drain valve fails; a determination portion configured to measure voltages of channels of a fuel cell stack to determine whether stability of the fuel cell stack is secured; and a controller configured to control, when the stability of the fuel cell stack is not secured and a failure occurs on one or more of the purge valve and the drain valve, one or more of an operating pressure and an operating temperature of the fuel cell stack and a current applied to the fuel cell stack.