METHOD AND SYSTEM FOR CONTROLLING ENGINE START WHEN STARTER MOTOR OF HYBRID ELECTRIC VEHICLE IS FAILURE

摘要

The present invention relates to a method and a system for controlling an engine start when a starter motor of a hybrid vehicle starting an engine of the hybrid vehicle malfunctions. An embodiment of the present invention provides an engine start controlling method of a hybrid vehicle including an engine clutch controlling the power connection of an engine and a driving motor and a transmission clutch connecting the driving motor and a transmission. The engine start controlling method includes a step of determining whether the starter motor malfunctions or not when an engine start is requested; a step of slip-controlling the transmission clutch if the starter motor malfunctions to make the torque of the driving motor, the engine, and the transmission torque of the transmission be mutually independent when the engine is started by the driving motor; a step of controlling the driving motor in order to generate a driving force required to start the engine when the slip of the transmission clutch is started; and a step of starting the engine by controlling the pressure of the engine clutch in order to transmit the driving force of the driving motor to the engine. [Reference numerals] (AA) Start; (BB,DD,FF) No; (CC,EE,GG) Yes; (HH) End; (S110) Engine start is required?; (S120) Starting motor is malfunctioned?; (S125) Starting an engine with the starting motor; (S130) Slip-controlling a transmission clutch; (S140) Controlling a motor speed; (S150) Controlling the pressure of an engine clutch; (S160) Starting is completed?; (S170) Controlling the motor speed to make the difference in speeds of both ends of the transmission clutch be zero