Engine stall prevention apparatus for a hybrid vehicle provided with a mechanism that changes the engine speed depending on clutch state detection

Abstract

This invention relates to an engine stall prevention apparatus for a hybrid vehicle. This engine stall prevention apparatus comprises a clutch operation detection device which detects an operation of a clutch; a clutch state determination device which determines the state of the clutch based on the relationship between the vehicle speed and the engine speed; a throttle opening degree determination device which determines the degree of throttle opening of the engine; a first engine speed modification device (S ) which modifies a charging/regeneration allowing lower limit engine speed value above which deceleration regeneration by the electric motor is allowed; and a half-engaged clutch determination maintaining device (S ) which outputs a determination signal indicating that the clutch is half-engaged for a predetermined period of time when the throttle is completely closed and the clutch is determined to be half-engaged. When a half-engaged clutch determination is maintained, the first engine speed modification device elevates the charging/regeneration allowing lower limit engine speed value.