Power-split strategy of a novel dual-input series-parallel hybrid electric vehicle

Abstract

This paper proposes a novel dual-input powertrain for series-parallel hybrid electric vehicle (HEV) which includes one engine, two motors/generators (MGs), and a dual-input automated manual transmission (AMT). Although hybrid powertrain with multi-power sources have been recognized that has great potential to improve fuel economy, the challenge here is how to manage the operation of the powertrain elements. To do this, firstly, the powertrain configuration is analysed in detail, all operating modes, such as in accelerating and decelerating condition, are presented. Secondly, the simulation model of the powertrain system is built. Thirdly, a power-split strategy is proposed to manage the power flow aiming at minimize total energy consumption. Finally, the simulation result is compared between vehicle adopted proposed series-parallel configuration and a traditional parallel type. The results demonstrate that the proposed series-parallel powertrain and power-split strategy have the ability to keep engine and MGs working in high efficiency regions. Furthermore, the coordination of the powertrain elements makes the series-parallel HEV achieve better performances without any compromising in energy efficiency compared to the equivalent parallel HEV.