Fuel Cell Cooling Valve Logic for Sensor Fault Detection
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Solution Overview
Problem
Existing cooling systems for fuel cells may incorrectly determine abnormalities due to errors in sensor readings when one of the sensors fails, leading to inaccurate detection of system anomalies.
Innovation Solution
A cooling system for fuel cells that includes multiple temperature sensors and a flow regulating valve to monitor system abnormalities by comparing temperature readings under different flow diversion ratios, allowing for precise identification of sensor errors through predetermined value comparisons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature sensor readings are used to detect system abnormalities, then the cooling system can be monitored for anomalies, but sensor errors may lead to incorrect abnormality determination
Solution Approach 1:
The system dynamically changes the flow diversion ratio of the flow regulating valve between a first state (e.g., 100% to bypass channel) and a second state (e.g., 0% to bypass channel), and compares temperature sensor readings under these different dynamic conditions to identify sensor errors and determine actual system abnormalities
Solution Approach 2:
The system changes the operating parameters of the flow regulating valve (flow diversion ratio) to create different thermal conditions in the cooling system, allowing comparison of temperature readings under varying parameters to detect sensor failures and distinguish them from actual thermal abnormalities
2Reliability
If multiple temperature sensors are used to monitor the cooling system, then more comprehensive monitoring is achieved, but the system complexity increases
Solution Approach 1:
The cooling system performs self-diagnosis by using its existing temperature sensors and flow regulating valve to automatically detect sensor failures and system abnormalities through controlled parameter changes and reading comparisons, eliminating the need for additional diagnostic sensors or complex monitoring infrastructure
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 reliable and straightforward detection and identification of abnormalities in the cooling system by comparing temperature sensor readings, ensuring accurate monitoring and maintenance of the system's integrity.
Implementation Method 1
a radiator
Implementation Method 2
an intercooler that cools an oxidizing gas to be supplied to the fuel cell stack
Implementation Method 3
a flow regulating valve that is located at a branch point where the bypass channel branches off from the first cooling medium return channel and that regulates a flow diversion ratio to the bypass channel
Implementation Method 4
a first temperature sensor that is located in the first cooling medium return channel and that detects a temperature of the cooling medium after passing through the fuel cell stack; a second temperature sensor that detects a temperature of the oxidizing gas after passing through the intercooler
Data Source
AI summary
A cooling system for a fuel cell that cools a fuel cell stack and an intercooler includes a radiator, a stack cooling circuit, an intercooler cooling circuit, a bypass channel, a flow regulating valve that regulates a flow diversion ratio to the bypass channel, a first temperature sensor, a second temperature sensor, and a control device that performs an abnormality monitoring process of monitoring the cooling system for an abnormality. The abnormality monitoring process includes a first determination process of determining that there is an abnormality when the flow diversion ratio of the flow regulating valve is 100 percent and the difference between the detected value by the first temperature sensor and the detected value by the second temperature sensor is equal to or greater than the first predetermined value.