Energy Flow of a Plug-In Electric Vehicle under the New European Driving Cycle

作者：Zhang, Yan^*; Yuan, Xiayi; Duan, Lian; Jiang, Liang; Xu, Yanghui; Lan, Fengchong; Lin, Yinhui

来源：Journal of Energy Engineering - ASCE, 2021, 147(6): 04021049.

DOI：10.1061/(ASCE)EY.1943-7897.0000782

• Energy flow
• State of charge (SOC)
• Plug-in hybrid electric vehicle
• Tests

In order to obtain comprehensive fuel consumption of parts and systems in the energy transmitting process of plug-in hybrid electric vehicles, this work carried out an experimental study on energy flow of vehicles and made a comparison of vehicle performance and efficiency under different start states and state of charge (SOC) levels. The results show that the SOC has a major influence on equivalent fuel consumption against the way a vehicle starts, including cold and hot starts when the high-voltage battery has a low SOC level. Conversely, the start method plays a more important role in fuel efficiency for vehicles with high SOCs. In addition, the efficiency of engine and electric networks was also investigated. The results suggest that the highest brake thermal efficiency of 36% occurs when the vehicle is at a hot start and low SOC. This low SOC must be higher than the minimum limit. Also, motor efficiency increases with the increase of the SOC.

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