Abstract: A multi-stage and multi-objective energy management strategy was proposed based on metal
V-belt continuously variable transmission (CVT) in the light of the characteristics of a new designed plug-in
hybrid electric vehicle (PHEV) according to the different states of charge and required power. Adjustment of an
engine’s working point was made by controlling the motor’s output torque; And optimization of a motor’s working
point was promoted by controlling CVT ratio. A PHEV model was established by using forward-facing simulation
on a Matlab/Simulink platform, and the simulations were conducted under NEDC (New European Drive Cycle)
conditions. The results show that under different conditions, the energy management strategy satisfies the PHEV
control requirements; and distributes reasonably the motor torque and the internal combustion engine torque; The
equivalent fuel consumption of 4.26 L/ (100 km) for the new strategy is 46.1% lower than that for the conventional
internal combustion engine vehicle. Therefore, the availability is checked for the energy management strategy.

Key words: plug-in hybrid electric vehicle (PHEV), continuously variable transmission (CVT), energy management strategies, mode switching, simulation analysis