Patent ID: 7004884

Claim:
A powertrain system of a hybrid electric vehicle (HEV), comprising: an engine; a clutch; a primary motor; an automated shift gearbox (ASG) connected to the engine through the clutch; a secondary motor; and a differential gearbox, wherein the primary motor is disposed between an output shaft of the clutch and an input shaft of the ASG, and the secondary motor is disposed between an output shaft of the ASG and an input shaft of the differential gearbox, further comprising a controller executing a shift operation by controlling the engine, the clutch, the primary and secondary motors, and the ASG, wherein the controller adjusts outputs of the engine and the primary and secondary motors during the shift operation, wherein the controller executes a clutch disengagement mode during the shift operation, the clutch disengagement mode comprising: controlling an output torque of the engine during a disengagement of the clutch such that the output torque of the engine lies within a predetermined torque capacity of the clutch; controlling a rotation speed of the engine after the disengagement of the clutch such that the rotation speed of the engine is synchronized with a rotation speed of the output shaft of the clutch at a target shift-speed; and controlling the primary and secondary motor such that a required torque is output through the input shaft of the differential gearbox.