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| Research on the Oxygen Excess Ratio Fluctuation with Current Regulation for a PEM Fuel Cell Engine |
| ZHOU Su-1a, 1b , JI Guang-Ji-1a, LIU Ji-Chen-1a, HU Zhe-2 |
| (1a. College of Automotive Studies; 1b. Clean Energy Automotive Engineering Center,Tongji University, Shanghai 201804; 2. SAIC Motor, Shanghai 201804, China) |
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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.
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Received: 13 January 2012
Published: 30 November 2012
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