Research on the Oxygen Excess Ratio Fluctuation with Current Regulation for a PEM Fuel Cell Engine

Abstract

Abstract: Currently the control of air flow in PEMFC system is mainly feed-forward/feedback configuration which will inevitably lead to the ratio fluctuation when the current changes abruptly. The ratio fluctuation can affect the health of fuel cells. This research aims to find the optimal time constant of first-order dynamics for the drawn current from the stack. The simulation results indicate that the time constant depends on not only the change in the magnitude of request current and its initial value, but also the compressor inertia and its location in the vehicle.

Key words: current regulation, oxygen excess ratio, fluctuation control, fuel cell engine

CLC Number:

TP 29

ZHOU Su-1a, 1b , JI Guang-Ji-1a, LIU Ji-Chen-1a, HU Zhe-2. Research on the Oxygen Excess Ratio Fluctuation with Current Regulation for a PEM Fuel Cell Engine[J]. Journal of Shanghai Jiaotong University, 2012, 46(11): 1712-1717.

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