Method and system for controlling engine clutch of hybrid vehicle

摘要

A method and system for controlling an engine clutch of a hybrid vehicle that may effectively select an engagement way of the engine clutch according to a state of the hybrid vehicle and a running state includes: detecting driver's demand torque; calculating sync speed torque that the motor outputs at a predetermined target speed for the sync engagement; detecting a state of charge (SOC) of a battery of the hybrid vehicle; calculate charging torque of an integrated starter-generator (ISG) operated by power of the engine; performing the sync engagement when speed of the motor is greater than the predetermined target speed for the sync engagement; and performing the sync engagement or the launch slip engagement based on the driver's demand torque, the sync speed torque of the motor, the SOC, and the charging torque when speed of the motor is less than the predetermined target speed for the sync engagement.

主权项

1. A method for controlling an engine clutch that controls power transmission between an engine and a motor of a hybrid vehicle comprises:
detecting a driver's demand torque; calculating a synchronization (sync) speed torque that the motor is able to output at a predetermined target speed for sync engagement; detecting a state of charge (SOC) of a battery of the hybrid vehicle; calculating a charging torque of an integrated starter-generator (ISG) operated by power of the engine; performing the sync engagement of the engine clutch when a speed of the motor is greater than the predetermined target speed for the sync engagement, in which the sync engagement engages the engine clutch after synchronizing speeds of both ends of the engine clutch; and selectively performing the sync engagement or launch slip engagement of the engine clutch based on the driver's demand torque, the sync speed torque of the motor, the SOC, and the charging torque when the speed of the motor is less than the predetermined target speed for the sync engagement, wherein the launch slip engagement engages the engine clutch by slip-controlling the engine clutch before the speeds of both ends of the engine clutch are synchronized, and wherein the step of selectively performing includes: comparing the driver's demand torque with the sync speed torque of the motor; and performing the launch slip engagement when the driver's demand torque is greater than the sync speed torque of the motor.