| 摘要 |
A hybrid electric vehicle (HEV) comprises an engine (121) and at least one electric machine (123). The vehicle is operable in an electric vehicle (EV) mode in which the electric machine (123) develops torque to drive the vehicle whilst the engine (121) is switched off. According to the invention, the vehicle is operable when in EV mode automatically to cause engine turnover without starting the engine when a prescribed one or more conditions are met. This can be done for diagnosis or to meet braking requirements. |
