In order to study the start resistance torque of power split hybrid vehicle engine

a dynamic resistance torque analysis model was established. Based on the model

pump gas resistance torque and reciprocating inertia force torque were simulated by using the Matlab/Simulink according to the formulas

measured cylinder pressure and engine parameters data. The engine friction torque experiment at water temperature of 30℃ was made to get the result of engine static and dynamic friction torques. The dynamic resistance torque in engine starting process was obtained by combining calculation with experiment. To investigate the influences of the opening throttle angle

initial crank angle and engine water temperature on the dynamic resistance torque

the experiments were carried out of cylinder pressure at different throttle openings and at two different engine speeds

static friction torque at different initial crank angles and dynamic torque at different water temperatures. The engine towing test was conducted to validate the dynamic resistance torque model. The result shows that the combination of simulation and experiment can accurately describe the characteristics of the starting resistance torque of hybrid vehicle engine.