Patent ID: 8886374

Claim:
A torque control method for a hybrid electric vehicle, the torque control method comprising: detecting an operation failure of an integrated starter-generator (ISG); upon detecting the operation failure of the ISG keeping a vehicle in motion once an ISG operation failure has occurred by: calculating a driver demand torque based on a current accelerator position sensor (APS); controlling a hydraulic pressure and operation of a clutch so as to increase an engine speed to convert a driving mode of the hybrid electric vehicle from electric vehicle (EV) mode to hybrid electric vehicle (HEV) mode during the clutch slip operation in the event that an operation failure of the ISG is detected and the driver demand torque is out of a predetermined range; compensating the driver demand torque to a desired level based on a transfer torque from the clutch to a motor; wherein said compensating the driver demand torque includes: calculating the transfer torque from the clutch to the motor during the clutch slip operation; and compensating a motor torque in accordance with a negative transfer torque in a friction start by the clutch slip as the calculated transfer torque; and wherein controlling the hydraulic pressure and operation of the clutch further comprises: engaging the clutch to synchronize rotational speeds of both an engine and the motor and increasing the hydraulic pressure of the clutch to a maximum to enable the hybrid electric vehicle to drive in the HEV mode.