Smooth Mode-Switch Control for the Powertrain of Parallel Hybrid Electric Vehicle

The coordinated control of internal combustion engine and electric machine is vital to improve driveability and reliability of Parallel hybrid electric vehicle (PHEV). This paper address to the mode-switch problem for powertrain of PHEV, construct a model-based rapid control prototype as a controller by MATLAB/SIMULINK software and dSPACE system for mode-switch control, come up with a mode-switch control strategy which employ the quick transient response of electric machine to compensate the deficiency of transient torque performance of internal combustion engine. Aiming at the general characters of mode-switch, a experiment schedule was implemented on the PHEV test bench, Comparing to the control method by estimating the engine toque with steady torque map, the experiment result show that the control strategy proposed in this paper can reduce the torque and speed fluctuation significantly during the course of mode switching in PHEV