Patent ID: 6569052
Filing Date: 2003-05-27
Classification: F16H

Abstract:
A controller for an infinitely variable transmission, the infinitely variable transmission comprising an input shaft, a continuously variable transmission which outputs the rotation of the input shaft at an arbitrary speed ratio, a fixed speed ratio transmission which outputs the rotation of the input shaft at a fixed speed ratio, a differential mechanism having a first rotation element which rotates according to an output rotation of the continuously variable transmission, a second rotation element which rotates according to an output rotation of the fixed speed ratio transmission, 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, and an output shaft joined to the third rotation element, the controller comprising:a first sensor which detects the rotation speed of the input shaft; a second sensor which detects the output rotation speed of the continuously variable transmission; and a microprocessor programmed to: calculate the rotation speed of the output shaft from the rotation speed of the input shaft and the output rotation speed of the continuously variable transmission; and control the speed ratio of the continuously variable transmission based on the rotation speed of the output shaft.