Patent ID: 6393349
Filing Date: 2002-05-21
Classification: B60W,F16H

Abstract:
A vehicle drive force control device comprises:an infinite speed ratio transmission permitting continuous variation of a speed ratio up to infinity and is joined to a motor, running state detection sensors which detect a vehicle running state, an input shaft rotation speed sensor which detects a rotation speed of an input shaft of the infinite speed ratio transmission, an output shaft rotation speed sensor which detects a rotation speed of an output shaft of the infinite speed ratio transmission, and a microprocessor which controls the infinite speed ratio transmission and the motor, wherein this microprocessor is programmed to: calculate a target output shaft torque based on a detection value of the running state detection sensor, compute a speed ratio factor of an input shaft rotation speed and an output shaft rotation speed as output shaft rotation speed/input shaft rotation speed, from the detection values of the input shaft rotation speed sensor and output shaft rotation speed sensor, compute a torque ratio of the infinite speed ratio transmission from this speed ratio factor, compute a target torque of the motor from the target output shaft torque of the infinite speed ratio transmission and the torque ratio, control the output of the motor according to this target torque, and compute a target input shaft rotation speed of the infinite speed ratio transmission based on a vehicle speed, and thereby control the speed ratio.