Clutch torque estimating method for vehicle transmission

A clutch torque estimating method for a transmission of a vehicle, the clutch torque estimating method comprising:

• inputting model engine torque to a powertrain model by a controller;
• inputting target clutch torque of a first clutch and target clutch torque of a second clutch to the powertrain model by the controller;
• inputting shifting information related to the vehicle to the powertrain model by the controller;
• correcting the powertrain model in real time by feeding back an engine angular velocity error which is a difference between a measured engine angular velocity and an estimated engine angular velocity determined from the powertrain model, a clutch angular velocity error of the first clutch which is a difference between a measured clutch angular velocity of the first clutch and an estimated clutch angular velocity of the first clutch determined from the powertrain model, a clutch angular velocity error of the second clutch which is a difference between a measured clutch angular velocity of the second clutch and an estimated clutch angular velocity of the second clutch determined from the powertrain model, and a wheel angular velocity error which is a difference between a measured wheel angular velocity and an estimated wheel angular velocity determined from the powertrain model, to the powertrain model by the controller;
• estimating clutch torque of the first clutch and clutch torque of the second clutch by determining the powertrain model by the controller;
• and
• controlling the first clutch and the second clutch using the estimated clutch torque of the first clutch and the estimated clutch torque of the second clutch by the controller.