Mode changeover control device for a hybrid vehicle

摘要

A mode changeover control device (20) for a hybrid vehicle includes an engine (1), a motor/generator (5) and at least one driving wheel (2). A changeover between an electric drive mode using only the electric motor (5) to power the at least one driving wheel (2) and a hybrid drive mode using both the engine (1) and the electric motor (5) to power the at least one driving wheel (2) is controlled. The drive mode is changed from the hybrid drive mode to the electric drive mode if the accelerator opening (APO) is less than a first threshold level (³), and the drive mode is changed from the electric drive mode to the hybrid drive mode if the accelerator opening is greater than a second threshold level (±). A hysteresis value is defined between the first threshold level and the second threshold level, and the hysteresis value is changed based on a vehicle operating state.