Design and Analysis of a Novel Multimode Powertrain for a PHEV Using Two Electric Machines

A new dual-motor plug-in hybrid system has been developed in this paper. The system has a variety of operating modes such as “pure electric drive”, “series hybrid drive”, “parallel hybrid drive”, and “pure oil drive”, which can maximize fuel efficiency according to the driving conditions of the vehicle and the needs of the driver. By adding high-power on-board chargers and high-capacity lithium-ion battery packs to the system, more electric driving can be achieved. This paper introduces the parameters and performance indexes of the main components of the system, establishes the simulation model of the powertrain, formulates the control strategy, and analyzes the power performance and fuel economy of the system through simulation. The simulation results are as follows: the maximum speed of the vehicle can reach 180.82km/h; the acceleration time of 100 km/h is 7.72s; in the WLTC driving cycle, the fuel consumption of the hybrid power system is 7.648L/100km; the electric driving range is 156.63 km. The simulation results show that the powertrain can reduce fuel consumption while maintaining sufficient power performance, which proves the feasibility and fuel economy potential of the scheme.