Fuel Cell Air Intake Control via Motor Current Rate-of-Change
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Solution Overview
Problem
Fuel cell vehicles face challenges in maintaining stable output power and durability due to slow air supply, leading to potential dry-out and performance reduction, especially when output power increases, as existing methods struggle to accurately calculate air requirements considering variations in motor products and temperature.
Innovation Solution
A method for controlling air intake in fuel cell vehicles involves calculating a basic air intake value based on driver requirements, determining motor current requirements, calculating the rate-of-change of these requirements, and adjusting with a gain value proportional to vehicle speed to ensure supplementary air intake, thereby optimizing air supply and preventing shortages or excesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If air supply is increased preemptively to maintain stable output power when fuel cell output increases, then output power stability is improved, but excessive air supply may cause dry-out of the fuel cell and durability degradation
Solution Approach 1:
The control method calculates supplementary air intake based on the rate of change of motor current requirement, enabling preemptive air supply before the fuel cell output power increases. This preliminary action ensures that air flow is maintained at levels sufficient for upcoming power demands, preventing output power instability while avoiding excessive air supply that could cause dry-out and durability degradation.
Solution Approach 2:
The air intake control dynamically adjusts the supplementary air intake amount based on the real-time rate of change of motor current requirement. By making the air supply dynamic and adaptive to changing power demands, the system maintains optimal air flow levels that prevent both insufficient air supply (which would reduce output power stability) and excessive air supply (which would cause dry-out and durability issues).
2Stability of the object's composition
If air supply using a blower is increased to maintain particular amount of air flow, then output power stability is improved, but air supply speed is slow causing durability degradation and performance reduction
Solution Approach 1:
The control method preemptively calculates and supplies supplementary air intake based on the rate of change of motor current requirement, allowing the blower to begin air supply before the power demand actually increases. This preliminary action compensates for the slow response speed of the blower, ensuring that the particular amount of air flow is maintained without waiting for the blower to react to power changes.
Solution Approach 2:
The system dynamically adjusts the air intake amount based on the rate of change of power demand, enabling the blower to operate at optimized speeds. By calculating supplementary air intake in real-time, the system maximizes the blower's effective response while maintaining stable air flow, overcoming the inherent slow speed limitation of blower-based air supply systems.
3Ease of operation
If motor requirement map is used to calculate air intake, then air supply control is simplified, but inaccurate motor map due to product variation and temperature causes excessive air supply or shortage of air
Solution Approach 1:
The control method uses feedback from the actual motor current to calculate the rate of change of motor current requirement. This feedback mechanism allows the system to adapt to actual operating conditions including product variations and temperature effects, significantly improving air intake accuracy compared to using a fixed motor requirement map while maintaining relatively simple control logic.
Solution Approach 2:
Instead of relying on a fixed motor requirement map, the system dynamically calculates the supplementary air intake amount based on the rate of change of motor current requirement. This parameter change approach adapts to varying operating conditions such as temperature and product variations, maintaining high air intake accuracy without complicating the control system.
Data Source
AI summary
A method and a system are provided for controlling an air intake of a fuel cell vehicle. The method includes calculating a value for basic air intake of a fuel cell based on a driver requirement and calculating a value of motor current requirement based on the driver requirement. A rate-of-change is calculated of the value of motor current requirement and a value for supplementary air intake is calculated by multiplying the rate-of-change of the value of motor current requirement by a gain value. A value for final air intake is then calculated by adding the value for basic air intake and the value for supplementary air intake. An air blower of an air intake system of the fuel cell is operated with the value for final air intake.