Abstract
The mode transition from electric propulsion mode to hybrid propulsion mode is important with regard to the power management strategy of plug-in hybrid electric vehicles (PHEVs). This is because mode transitions can occur frequently depending on the power management strategies and driving cycles, and because inadequate mode transitions worsen the fuel efficiency and drivability. A pre-transmission parallel PHEV uses a clutch between the internal combustion engine (ICE) and the electric motor (EM) to connect or disconnect the power source of the ICE for a mode transition. The mode transition requires additional energy consumption for clutch speed synchronization, and is accompanied by a drivetrain shock due to clutch engagement. This paper proposes a control strategy for the mode transition with gear-shifting to resolve the problems of energy consumption and drivetrain shock. Through the development of a PHEV performance simulator, we analyze the mode transition characteristics and propose a control strategy considering the vehicle acceleration and gear state. The control strategy reduces the duration required for the mode transition by moving the start time of the mode transition. This helps to improve energy efficiency while maintaining adequate drivability.
Highlights
Plug-in hybrid electric vehicles (PHEVs) are a type of hybrid electric vehicle (HEV) with rechargeable batteries that connect via a plug to an external electrical power source
This paper proposed a control strategy for mode transitions of PHEVs
Performance simulator, we considered that the mode transition occurs repeatedly with gear shifting to reduce the duration of mode transition
Summary
Plug-in hybrid electric vehicles (PHEVs) are a type of hybrid electric vehicle (HEV) with rechargeable batteries that connect via a plug to an external electrical power source. Both PHEVs and HEVs have two or more different power sources—an internal combustion engine (ICE) and an electric motor (EM). HEVs, a PHEV has a larger battery capacity and can run more efficiently by properly using electrical energy [3]. In this respect, a PHEV has more frequent driving mode transitions. The EV mode uses only an EM, while the HEV mode uses an ICE and an EM
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