Analysis and optimization of factors influencing the efficiency of electromechanical coupling systems of hybrid electric vehicle
This paper studies the main factors affecting the transmission efficiency of the electromechanical coupling system and analyzes the influencing factors for the mechanical loss, electronic control loss and motor loss. Our analysis shows the mechanical loss is closely related to the friction condition. The electronic control loss includes IGBT loss and FWD loss, both of which are affected by the switching frequency. Motor loss is related to magnetic field strength and current. It is proposed to optimize the comprehensive efficiency of the electromechanical coupling system by improving the friction conditions and adjusting the IGBT switching frequency. The transmission efficiency test bench of the electromechanical coupling system is developed, and the results of mechanical loss, electronic control loss and motor loss under different working conditions in pure electric mode are measured by the self-developed test bench. The change law of mechanical loss, electronic control loss and motor loss with working conditions is analyzed. Our results show the use of low friction bearing and low viscosity oil to improve the friction conditions effectively reduces the mechanical loss and the maximum efficiency increases by 0 . 9％. The switching frequency is adjusted from 10 kHz to 5 kHz, and the transmission efficiency is significantly improved in the low speed section. Accordingly, we propose a dynamic adjustment strategy of IGBT switching frequency based on transmission efficiency.
hybrid electric vehicleelectromechanical coupling systemtransmission efficiencypower losstest
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