Fuel Cell Air Flow Control for Acceleration Performance
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Solution Overview
Problem
Fuel cell vehicles experience limited acceleration performance and energy loss due to insufficient air supply and excessive air supercharging, which leads to decreased fuel cell stack performance.
Innovation Solution
A method to control the amount of air flow to a fuel cell stack based on the driver's acceleration intention by calculating the speed of the acceleration pedal and setting appropriate output values for the fuel cell stack, thereby adjusting air flow to match the requested power, preventing energy loss and performance deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If air-blower is driven rapidly to satisfy acceleration performance, then power is output promptly from fuel cell, but energy is lost due to air supercharging and fuel cell stack performance decreases
Solution Approach 1:
The air-blower operates in two distinct modes: a first rotation speed for normal operation and a second, higher rotation speed when acceleration is detected. The control unit dynamically switches between these modes based on driver acceleration intention, allowing the system to optimize between fuel efficiency and acceleration performance as needed.
Solution Approach 2:
The control unit detects driver acceleration intention in advance and pre-adjusts the air-blower rotation speed and fuel cell output order value before the actual acceleration demand occurs. This preliminary action ensures that the fuel cell stack is ready to deliver required power without delay while avoiding unnecessary air supercharging during transient conditions.
2Speed
If air-blower is driven rapidly to satisfy acceleration performance, then power is output promptly from fuel cell, but inside of fuel cell stack dries out and performance decreases
Solution Approach 1:
The system dynamically adjusts the air-blower rotation speed and fuel cell output order value based on detected acceleration intention. By switching to a second rotation speed only when acceleration is detected and maintaining appropriate output ordering, the system ensures sufficient air supply to prevent stack drying out while still meeting acceleration demands.
Solution Approach 2:
The control unit continuously monitors driver acceleration intention and adjusts the air-blower operation and fuel cell output accordingly. This feedback mechanism ensures that air supply matches actual power demands, preventing both excessive air supercharging and insufficient air supply that would cause stack drying out.
3Loss of energy
If output value is reduced when acceleration intention is detected, then air flow is optimized and energy loss is prevented, but power output may be limited without proper air supply
Solution Approach 1:
The control unit dynamically adjusts the fuel cell output order value based on detected acceleration intention. When acceleration is detected, the system sets a second output order value that is lower than the first, optimizing air flow to match actual power needs and preventing energy loss from air supercharging while maintaining adequate power output capability.
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 enhances fuel efficiency and acceleration performance by optimizing air flow according to the driver's intentions, preventing fuel cell stack dry-out and performance degradation.
Implementation Method 1
a motor is driven using power from fuel cells in a fuel cell vehicle and the power from fuel cells is generated through a reaction between hydrogen and oxygen
Data Source
AI summary
A technique for supercharging a fuel cell is provided. In particular, a speed of an acceleration pedal is calculated and a first output order value of a fuel cell stack or a second output order value of the fuel cell stack which is smaller than the first output order value is set, in accordance with the value of the calculated speed. An amount of air flow corresponding to the set first output order value or the second output order value to be supplied to the fuel cell stack is then controlled accordingly.