Sungkyunkwan University, Korea
Sunyoung Park received B.S. degree in mechanical engineering from Sungkyunkwan University, Suwon, Korea, in 2014, where she has been working toward the M.S. degree. Her research interests include the powertrain system, control strategy of electric vehicles, hybrid electric vehicles and plug-in hybrid electric vehicles. Hyunsoo Kim* received his Ph.D. degree in mechanical engineering from University of Texas at Austin, Texas, USA in 1986. Since 1986, he has worked as a Professor, Chairman, Dean of the College of Engineering and Executive Vice President at Sungkyunkwan University. His research interests include design and control of Plug-in Hybrid Electric Vehicle (PHEV) and Hybrid Electric Vehicle (HEV) transmission system.
In this paper, a comparative analysis was performed on power characteristics and mode control algorithm for plug-in hybrid electric vehicles (PHEVs): Honda Accord and Toyota Prius+. The power characteristic analysis of the target PHEVs was conducted to obtain the operating range of the possible vehicle velocity and driveshaft torque for each driving mode such as EV, HEV mode and Series mode. For each mode, the system efficiency was calculated by considering the powertrain component(motor, generator, engine, planetary gear set and clutch) efficiency and vehicle driving condition such as vehicle velocity and driveshaft torque since the powertrain component efficiency changes depending on the vehicle driving condition. Using the calculated system efficiency, a mode shift map was developed for each driving mode. Based on the developed mode shift map, the mode control algorithm was proposed to obtain the improved system efficiency. The vehicle performance simulator and control algorithm such as regenerative braking control and engine optimal operating line control were developed for target PHEVs. The proposed mode control algorithm was applied to each target PHEVs. Through the simulation results, a comparative analysis was performed on the power characteristics and mode control algorithm for the target PHEVs. This comparative analysis can be used to design the power-split PHEV configuration and to develop the optimal mode change algorithm.