A Novel Engine Start Mechanism for an Electrified Powertrain

This study aims to evaluate a novel starting mechanism (planetary starter) to crank the engine of a hybrid electric vehicle for a flying start maneuver. The study describes the P2 architecture and the planetary starter mechanism. The disturbance during engine crank and driveline engagement is a vital drive quality metric for a P2 vehicle. A linear quadratic Gaussian (LQG) controller is developed to reject the disturbance. The main results of the vehicle acceleration (disturbance) with and without the controller are compared. The results indicate that the planetary starter can crank the engine, and the closed-loop controller can effectively reject the active disturbances during the engine crank event.