Fuel Cell System Control for Battery Output and Fuel Conservation
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Solution Overview
Problem
Fuel cell systems experience increased fuel consumption during start-up and power generation due to the need for additional fuel to warm up the fuel cell, leading to deteriorated efficiency as the number of start-ups and power generation cycles increase, which is not effectively addressed by existing technologies.
Innovation Solution
A method for controlling a fuel cell system that involves acquiring the charged amount of a secondary battery and the remaining fuel, adjusting the start-up threshold based on the fuel availability, and optimizing power generation to minimize unnecessary fuel consumption by prioritizing fuel usage when the battery's charged amount is low.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the fuel cell is started up from the stopped state or power generation is increased, then the output of the secondary battery is ensured, but the fuel consumption increases due to the need for additional fuel to warm up the fuel cell
Solution Approach 1:
The control device changes the start-up threshold parameter based on the remaining fuel amount. When fuel is abundant, a higher threshold triggers start-up to ensure battery output. When fuel is low, the threshold is lowered to prevent unnecessary start-ups that would consume valuable fuel for heating rather than power generation.
Solution Approach 2:
The start-up threshold is made dynamic rather than fixed. The control device continuously adjusts the threshold value according to real-time fuel level conditions, enabling the system to adapt its power generation strategy between ensuring battery output and conserving fuel resources.
2Speed
If the number of repeat in start-up of the fuel cell and increase of power generation is increased, then the responsiveness to battery charge/discharge cycles is improved, but the fuel consumption deteriorates due to repeated heating requirements
Solution Approach 1:
The control device modifies the start-up threshold parameter based on fuel availability to prevent excessive start-up cycles. By adjusting this parameter dynamically, the system limits the number of repeated start-ups when fuel is constrained, thereby reducing fuel loss from repeated heating operations.
Solution Approach 2:
The control device uses feedback from the fuel amount detection to regulate start-up decisions. The detected fuel level feeds back into the control logic, which then determines whether to raise or lower the start-up threshold, creating a closed-loop system that prevents wasteful repeated heating when fuel is limited.
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 reduces fuel consumption while ensuring the output of the secondary battery, thereby improving the overall efficiency and extending the lifespan of the fuel cell system by minimizing unnecessary fuel usage during start-ups and power generation.
Implementation Method 1
a fuel and an oxidant are supplied to a fuel cell and a generated power from the fuel cell is outputted to a secondary battery
Implementation Method 2
when the fuel cell is started up from the stopped state thereof, or power generation of the fuel cell is increased, temperature of the fuel cell needs to be raised to the action temperature suitable for power generation
Data Source
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AI summary
A fuel cell system supplies a fuel and an oxidant and outputs a generated power from the fuel cell to a secondary battery. In a method for controlling the fuel cell system, a charged amount of the secondary battery is acquired, when the charged amount of the secondary battery becomes equal to or less than a prescribed value, the fuel cell is started up from a state that the fuel cell stops power generation, or the generated power of the fuel cell is increased. In the method for controlling, a remaining amount of the fuel which can be supplied to the fuel cell is acquired and when the remaining amount of the fuel becomes small, the prescribed value is set to a smaller value as compared with when the remaining amount of the fuel is large.