TORQUE ESTIMATION APPARATUS FOR INTERNAL COMBUSTION ENGINE

To provide a torque estimation apparatus for an internal combustion engine which can learn the variation in the output torque of the internal combustion engine caused by the individual difference and the aging change of the internal combustion engine with good accuracy. A torque estimation apparatus for an internal combustion engine calculates a first estimation torque using a torque characteristic data for first estimation torque; calculates a second estimation torque based on an angular acceleration; learns a deviation between the second estimation torque and a preliminarily set reference value of the second estimation torque, as error learning value; and calculates a value obtained by correcting the first estimation torque by the error learning value, as the third estimation torque.