Fuel Cell Pump Control for Hydrogen Dilution and Noise Reduction
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Solution Overview
Problem
Fuel cell vehicles face inefficiencies in hydrogen management when stationary, leading to excessive hydrogen consumption and noise vibration due to unnecessary oxidant gas supply, which affects fuel efficiency and operational noise.
Innovation Solution
A control unit in the fuel cell system manages the oxidant gas supply by stopping its operation when the vehicle is stationary or under low load, delaying hydrogen dilution until the vehicle starts moving or a predetermined time has elapsed, thereby optimizing fuel usage and reducing noise vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pump supplies oxidant gas to dilute hydrogen in the cathode while the vehicle is stationary, then hydrogen is discharged from the cathode, but fuel efficiency deteriorates due to excessive hydrogen consumption
Solution Approach 1:
The control unit dynamically adjusts the pump operation based on vehicle state (stationary vs. moving). When the vehicle is stationary, the pump operation is stopped to prevent unnecessary hydrogen consumption. When the vehicle starts moving, the pump operation is activated to discharge hydrogen from the cathode. This dynamic control strategy resolves the contradiction by making the hydrogen discharge function conditional on vehicle motion state.
2Reliability
If the pump supplies oxidant gas to dilute hydrogen in the cathode while the vehicle is stationary, then hydrogen is discharged from the cathode, but noise vibration becomes noticeable
Solution Approach 1:
The control unit dynamically controls the pump operation based on vehicle motion state. When the vehicle is stationary, the pump operation is stopped to eliminate noticeable noise and vibration. When the vehicle starts moving, the pump operation is activated since the background noise from vehicle operation masks the pump noise. This dynamic control resolves the contradiction between hydrogen discharge reliability and noise vibration reduction.
3Use of energy by moving object
If the pump is stopped to improve fuel efficiency, then hydrogen accumulates in the cathode, but power generation capacity decreases
Solution Approach 1:
The system implements periodic pump operation synchronized with vehicle motion cycles. The pump operates intermittently - stopped during stationary periods to conserve fuel, and activated during vehicle motion to discharge hydrogen and maintain power generation capacity. This periodic action pattern resolves the contradiction by aligning hydrogen discharge operations with periods when the vehicle is already consuming fuel for motion.
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 by minimizing unnecessary hydrogen consumption and reduces noticeable noise and vibration during startup, ensuring the fuel cell generates power effectively when needed and maintaining secondary battery health.
Implementation Method 1
a pump that compresses the oxidant gas and supplies the compressed oxidant gas to the cathode
Implementation Method 2
supplying the cathode with an oxidant gas in order to dilute and discharge the hydrogen retained in the cathode
Data Source
AI summary
A fuel cell system includes: a power supply circuit including a fuel cell and a secondary battery; an oxidant gas supply flow passage; a pump; and a control unit configured to drive the pump and dilute hydrogen retained in an cathode. The control unit is configured to stop supplying an oxidant gas to the cathode by stopping an operation of the pump such that dilution of the hydrogen retained in the cathode is stopped, while the fuel cell vehicle remains stationary after a starter switch of the fuel cell vehicle is switched from an off state to an on state, or while a load required of the power supply circuit remains smaller than a predetermined value after the starter switch of the fuel cell vehicle is switched from the off state to the on state.