Abstract: Hybrid electric vehicles(HEVs) generate the power required to drive the vehicle via a combination of internal combustion engines and motor, the mode switch between internal combustion engines and motor is essential to vehicle’s power and drivability performance. In single-axle parallel hybrid electric vehicle, considering the difference of dynamic characteristics between ICE and motor, there are fluctuation of torque and the longitudinal impact during mode switch, making drivers uncomfortable. Dynamic torque control strategy is designed in order to solve drivability issues caused by propulsion mode’s switch during motor-drive mode to engine-drive mode and engine-motor-drive mode. This strategy includes fuzzy adaptive proportional-integral-differential(PID) control for engine speed and dynamic torque compensation control. The control strategy is finally validated by experimental tests based on the test bench of hybrid electric vehicle. The bench test results show that the proposed control strategy can effectively suppress the longitudinal degree of jerk caused by power coupling, which is the fundamental for our deeply research in the future.

Key words: Control strategy, Dynamic torque control, Engine clutch, Hybrid electric vehicle