Plug-in Hybrid Powertrain System with Dual Clutch

In order to reduce emissions, eco-friendly vehicles are being developed by car manufacturers worldwide. The plug-in hybrid electric vehicle(PHEV) system, which attracts the attention of consumers in recent years, combines the advantages of an electric vehicle(EV) and a hybrid electric vehicle(HEV). The PHEV system uses a large capacity battery that is charged through a household power source in order to extend the mileage. The PHEV system that can travel long distances with electricity only requires high efficiency electric drive. After the battery is exhausted, the engine must be able to sustain the charge of the battery while driving. Therefore, the loss of power from the engine to the wheels must be small. In this paper, a newly designed system is introduced for the characteristics of PHEV. The system is similar to the parallel TMED type. However, the difference is that a dual clutch is used, a multi-speed transmission is not used, and a motor is attached to each stage. The gear ratio of the system and the capacity of the power source were designed to evaluate the fuel efficiency. The system showed an improved fuel economy of 44.58 %, as compared to the internal combustion engine vehicle(ICEV) in the CS mode that sustained the charge of the battery.