In this paper, a control strategy of a CVT based parallel hybrid electric vehicle is proposed. The control strategy is developed based on the assumption that the energy flow from/to the motor/battery within a successive deceleration and acceleration p...
In this paper, a control strategy of a CVT based parallel hybrid electric vehicle is proposed. The control strategy is developed based on the assumption that the energy flow from/to the motor/battery within a successive deceleration and acceleration process is equal. For power distribution between the motor and engine, first, the motor power is determined from the viewpoint of battery energy balance and, then, the remaining power is supplied by the engine. In this way, improved fuel economy is achieved since more regenerative braking energy can be recuperated and both the motor and engine operate in a higher efficiency region compared with that of the power assist control algorithm. It is found from the simulation results that almost symmetric motor (generator) performance is observed in the motor speed/torque/efficiency map and 5.1% improvement of the fuel economy is achieved by the proposed strategy.