Fuel Cell Stack Start Inhibition During Cold Route Traversal
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Solution Overview
Problem
Fuel cell vehicles face challenges in operating under extreme low temperatures, leading to accelerated degradation and undesirable membrane icing during freeze start-ups, which can be exacerbated by frequent start-ups.
Innovation Solution
A vehicle system with a motor, battery, and controller that inhibits the start of the fuel cell stack during traversing when the predicted power demand is met by the battery alone, and the fuel cell stack temperature is below a threshold, thereby minimizing freeze start-ups and reducing degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the fuel cell stack is started frequently to meet power demands, then the available power for the vehicle is ensured, but the fuel cell stack experiences accelerated degradation and membrane icing during freeze start-ups
Solution Approach 1:
The system performs preliminary assessment of the route power demand and battery state before making the start-up decision. By evaluating predicted power demands along the entire route in advance, the controller can determine whether the battery alone can meet future power requirements, thereby avoiding unnecessary freeze start-ups that would degrade the fuel cell stack
Solution Approach 2:
The controller continuously monitors battery state of charge, temperature conditions, and predicted power demands, and adjusts the fuel cell start-up decision based on this feedback. When the battery is predicted to have sufficient capacity to meet future demands, the controller inhibits fuel cell start-up, creating a closed-loop control system that optimizes between power availability and stack durability
2Ease of operation
If the fuel cell stack operates in extreme low temperatures, then the vehicle can maintain operation, but the fuel cell system experiences accelerated degradation and membrane icing
Solution Approach 1:
The system assesses temperature conditions and power demands in advance before the vehicle begins traversal. By predicting whether the battery can meet future power requirements alone, the system可以避免 premature fuel cell start-ups in cold conditions, thereby preventing membrane icing and degradation before they can occur
Solution Approach 2:
The system uses the battery's energy storage capacity as a protective buffer against cold-weather damage. By allowing the battery to handle power demands during cold periods when conditions are favorable, the system converts the battery's presence from a mere power source into a protective element that shields the fuel cell stack from harmful freeze start-up conditions
Data Source
AI summary
A vehicle includes a motor, a battery, a fuel cell stack, and a controller. The battery is configured to supply power to the motor to propel the vehicle. The fuel cell stack is configured to generate power to charge the battery. The controller is programmed to, while traversing a route with the fuel cell stack not operating and, responsive to data indicative of a predicted distance to empty at an end of the route being greater than a distance threshold, inhibit starting of the fuel cell stack during the traversing.