Patent ID: 6612965
Filing Date: 2003-09-02
Classification: B60W,F16H,Y10T

Abstract:
A drive force control system for a vehicle, the vehicle comprising an engine, a continuously variable transmission having a first output shaft and transmitting a rotation of the engine at an arbitrary speed ratio to the first output shaft, a fixed speed ratio transmission having a second output shaft and transmitting the rotation of the engine at a fixed speed ratio to the second output shaft, a planetary gear set having a first rotation element joined to the first output shaft, a second rotation element joined to the second output shaft, and a third rotation element which varies a rotation direction and a rotation speed according to a difference between a rotation speed of the first rotation element and a rotation speed of the second rotation element, the vehicle running according to the rotation of the third rotation element, a selector lever which selects an operating range, the operating range comprising a travel range and a non-travel range, and a power recirculation mode clutch which connects and disconnects the second rotation element and the second output shaft, the system comprising:a sensor which detects the operating range; a first mechanism which increases an output torque of the engine; a second mechanism which increases a torque transmitted by the continuously variable transmission; and a microprocessor programmed to: determine if the engine rotation speed is equal to a predetermined idle rotation speed; determine if the operating range has changed over from the non-travel range to the travel range; control the first mechanism to increase the output torque of the engine and control the second mechanism to increase the torque transmitted by the continuously variable transmission and engage the power recirculation mode clutch, when the operating range has changed over from the non-travel range to the travel range.