Powertrain Control Strategies Overview for Hybrid Electric Vehicles

The current research on hybrid electric vehicles (HEV) has two aims: to improve fuel economy while also attempting to minimize emissions; and to implement an optimal control for powertrain components to satisfy the driver´s power demand and ensure smooth power transfer. For powertrain control strategies of improving drivability, this paper summarizes and extensively overviews the state-of-the-art electromechanical coupling powertrain strategies, with some kinematics analysis and advantages represented in these powertrains. Also, it reviews the coordinated control strategies for HEV in mode-switch and gear shifting, for which, illustrating a strategy based on the technology of dual clutch transmission (DCT). It is clear that the utilization of planetary gear sets and advanced transmissions such as e-CVT, DCT etc. has done so much contribution to optimal powertrain control strategies for hybrid vehicles, there remains further scope for devoted researchers into drivability.