System Integration and Control of PEMFC Bicycles and Mobility Scooter
Date Issued
2013
Date
2013
Author(s)
Gao, Cheng-Yung
Abstract
This thesis focuses on the control and integration of fuel-cell powered light electric vehicles. The study was carried out in three steps: fuel-cell control, power management, and system integration.
In this thesis, we used two proton exchange membrane fuel-cell (PEMFC) to the proposed electric vehicles. The first one was called the MISO FC because it has two inputs of hydrogen and air and one output of cell-current. Therefore, we applied multivariable robust control to the proportional valve and air pump to reduce hydrogen consumption while providing steady current for charging the secondary battery sets. The second fuel-cell was called the SISO FC because it has an input of hydrogen flow rate and an output of cell-voltage. Therefore, we can control the solenoid valve to regulate the hydrogen flow rate and reduce hydrogen consumption.
Second, we developed power management for the electric vehicles. We applied the MISO FC to the electric bicycles and designed a serial power-train, which consisted of the PEMFC and two 23.1V 6.9Ah LiFePO4 battery sets. The bike motors were directly powered by the battery set to avoid damaging the PEMFC due to rapidly varying loads. And the battery sets were charged in turn by the PEMFC when their capacities droped to a certain level. For comparison, we applied the SISO FC to the electric mobility scooter, and developed a parallel power-train that consisted of the PEMFC and one 23.1V 6.9Ah LiFePO4 battery set. The scooter motor was directly powered by the PEMFC at low loading mode, while the battery provided auxiliary power at the high loading mode.
Lastly, we integrated the two PEMFC with the proposed electric vehicles, and verified the system performance by experiments. Based on the results, the proposed PEMFC powered electric bicycles and mobility scooter are deemed effective.
Subjects
質子交換膜燃料電池
強韌控制
磷酸鋰鐵電池
電動腳踏車
電動代步車
系統整合
Type
thesis
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