Fuel Cell Vehicle Air Compressor Current Control at Ignition
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Solution Overview
Problem
Fuel cell-based vehicles face ignition failure due to voltage drops in the battery, which affects the smooth operation of the air compressor, leading to delayed response speeds of driving devices.
Innovation Solution
A method and apparatus that determine the ignition entry state of a fuel cell-based vehicle, calculate the open-circuit voltage of the battery, and adjust the drive current to the air compressor to minimize voltage drops, ensuring stable operation and preventing ignition failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the drive current to the air compressor is increased to improve response speed, then the response speed improves, but voltage drop increases causing ignition failure
Solution Approach 1:
The system performs preliminary action by determining the ignition entry state before actually driving the air compressor. By identifying the ignition-on signal duration and predicting the need for air compression in advance, the system prepares the drive current adjustment strategy beforehand, ensuring both rapid response and voltage stability during the critical ignition phase.
Solution Approach 2:
The system applies parameter changes by dynamically adjusting the drive current magnitude based on the determined ignition entry state. When ignition entry state is detected, the system modifies the drive current parameters to an appropriate magnitude that balances response speed with voltage drop prevention, thereby resolving the contradiction between speed and reliability.
2Reliability
If the drive current is reduced to minimize voltage drop, then ignition stability improves, but response speed of the air compressor decreases
Solution Approach 1:
The system applies dynamics by making the drive current adjustable and adaptive rather than fixed. Based on the determined ignition entry state, the system dynamically adjusts the drive current magnitude to an appropriate level, enabling the air compressor to respond quickly when needed while maintaining ignition stability through controlled current adjustment.
3Reliability
If the battery voltage is maintained at high level to prevent voltage drop, then ignition failure is prevented, but the drive current available to the air compressor is limited
Solution Approach 1:
The system performs preliminary action by determining the ignition entry state and predicting air compression needs before they occur. This advance determination allows the system to plan and adjust drive current allocation in advance, ensuring both sufficient power for the air compressor and stable voltage for ignition by preparing the appropriate current magnitude before the critical moment.
Data Source
AI summary
A method of driving a fuel cell-based vehicle may include determining whether the vehicle is in an ignition entry state, determining an open-circuit voltage of a battery that provides a voltage to the air compressor based on the vehicle being in the ignition entry state, determining a drive current provided to the air compressor from the battery based on the open-circuit voltage, and driving the air compressor based on the drive current.