Hybrid electric vehicle controller which selects power source at vehicle start-up

摘要

A controller 140 for a hybrid electric vehicle (HEV) 100 has an engine 121 and an electric machine 123. The controller 140 upon start-up of the vehicle (transition of the vehicle 100 from a condition in which the vehicle is not ready to move under its own power to a condition when the vehicle 100 is ready to move under its own power) controls the electric machine 123 to provide torque to drive the vehicle 100 with the engine 121 off if a battery 150 has a state of charge (SoC) above a prescribed threshold and to start the engine 121 if the battery state of charge is below the prescribed threshold.