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.