Fuel Cell Accessory Warming via Dual Temperature Sensors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fuel cell systems only consider the temperature of the fuel cell stack during warming-up operations, neglecting the temperatures of accessories, which can lead to inefficient startup performance and potential freezing issues.
Innovation Solution
A fuel cell system that includes temperature sensors for both the fuel cell and accessories, with a controller that executes a warming-up operation based on predetermined threshold temperatures for both, ensuring that even if the fuel cell temperature is above the threshold, the system warms up accessories if their temperature is below a certain level, thereby preventing freezing and optimizing startup performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the warming-up operation is executed solely based on the fuel cell temperature being below a threshold, then the control logic is simple, but the accessories may freeze when their temperature is low even if the fuel cell temperature is high
Solution Approach 1:
The temperature monitoring function is segmented into two independent parts: one for the fuel cell stack and another for the accessories. This allows each component to be monitored separately with its own threshold, enabling the system to detect freezing risks in accessories even when the fuel cell temperature is sufficient, thus improving reliability without excessive complexity.
Solution Approach 2:
The system performs preliminary warming-up of accessories by circulating heated cooling medium through accessory cooling channels before the accessories are fully operational. This preliminary action ensures accessories reach safe temperatures even when the fuel cell temperature alone would not trigger traditional warming protocols, preventing freezing issues in advance.
2Reliability
If the warming-up operation is executed when accessory temperature is below threshold even with high fuel cell temperature, then freezing prevention is improved, but fuel consumption increases
Solution Approach 1:
The system applies partial warming-up action specifically targeted at accessories rather than full-system warming. By circulating heated cooling medium only through accessory cooling channels and using localized heating, the system achieves sufficient freezing prevention with minimal additional fuel consumption, avoiding unnecessary full-stack warming when only accessories require attention.
Solution Approach 2:
The fuel cell stack serves dual purposes: generating electricity and providing thermal energy for accessory warming. The cooling medium absorbs excess heat from the fuel cell during normal operation and delivers it to accessories requiring warmth, making the system self-sufficient for accessory heating without requiring additional fuel input.
3Measurement precision
If temperature sensors are added for accessories, then freezing detection accuracy is improved, but device complexity increases
Solution Approach 1:
The cooling medium circulation system is designed with multi-functionality: it serves both the fuel cell stack cooling and accessory cooling/warming needs. By routing the cooling medium through both the fuel cell and accessory cooling channels in sequence or parallel, the system uses a single sensor on the cooling medium to indirectly monitor temperatures of both components, achieving accurate temperature detection without adding multiple sensors.
Solution Approach 2:
The cooling medium acts as an intermediary that carries thermal information between the fuel cell stack and accessories. A single temperature sensor measuring the cooling medium temperature provides indirect but accurate information about both the fuel cell and accessory temperatures, eliminating the need for separate sensors while maintaining measurement precision through the thermal coupling of the cooling medium.
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
This approach reliably suppresses freezing of accessories and enhances the overall startup performance of the fuel cell system by considering the temperatures of both the fuel cell and accessories, reducing unnecessary fuel consumption and ensuring efficient operation.
Implementation Method 1
The first temperature sensor is configured to acquire a first temperature that is a temperature of the fuel cell. The second temperature sensor is configured to acquire a second temperature that is a temperature of at least any one of the plurality of accessories.
Implementation Method 2
The controller is configured to perform control on the plurality of accessories to execute a warming-up operation of the fuel cell. It is possible to reliably suppress or restrain freezing of the accessory, and to increase the startup performance of the entire fuel cell system.
Data Source
AI summary
A fuel cell system includes a fuel cell, a first temperature sensor configured to acquire a first temperature that is a temperature of the fuel cell, a plurality of accessories that is used to operate the fuel cell, a second temperature sensor configured to acquire a second temperature that is a temperature of at least any one of the plurality of accessories, and a controller configured to perform control on the plurality of accessories to execute a warming-up operation of the fuel cell. The controller is configured to execute the warming-up operation when any of a first condition that the first temperature is lower than a predetermined first threshold temperature and a second condition that the first temperature is equal to or higher than the first threshold temperature and the second temperature is lower than a predetermined second threshold temperature is satisfied.