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In Polymer Electrolyte Membrane Fuel Cells (PEMFCs), precise regulation of air pressure and flow rate is critical to the performance and durability of fuel cell systems. This study is based on a 20-kW fuel cell engine. Based on physical interpretation and data, a nonlinear model of the cathode of the fuel cell system is presented in this paper. By utilizing the basic idea of differential geometry,...
Due to the low inertia, low damp, and high stiffness, in-wheel-drive system has vibration problems, especially under off-road conditions. Mechanical approaches such as applying additional inertia to wheels can effectively reduce the torsional vibration, however, that increases unsprung mass and brings more severe vertical vibration. In this article, electronic inertia is designed for the system to...
Efficiency and durability of proton exchange membrane fuel cell (PEMFC) are compromised by drying of the membrane and by water flooding. This paper introduces a novel water management strategy by exhaust gas recirculation (EGR). The PEM fuel cell system with cathode EGR has a simpler structure and operates at lower cost than the conventional one with an external humidifier. Based on a modified PEMFC...
Electric Vehicle (EV) is an effective solution responding to the energy crisis and environment problems, and is usually used for urban traffic where the acceleration and deceleration are very common. This paper proposes a new method called Optimal Speed Pattern Generating Method (OSPG-method) to improve the economy, ride comfort and safety of the EV during acceleration. First, the OSPG-method works...
A distributed control system comprising a TTCAN (Time Triggered Controller Area Network) and a J1939 CAN (Controller Area Network) is proposed for a PEM (Proton Exchange Membrane) fuel cell / Ni-MH battery hybrid vehicle. A current-regulated DC/DC (Direct Current to Direct Current converter) is used to control the output power of the fuel cell. The work of the hybrid power train is coordinated by...
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