Patent ID: 6368247
Filing Date: 2002-04-09
Classification: F16H,Y10T

Abstract:
A speed ratio control system for controlling speed ratios of a continuously variable transmission coupled to an engine, comprising:a setting element for setting a target speed of an input unit of the continuously variable transmission at a downhill running time on the basis of a target output of said engine; and a control element for controlling the speed ratios of the continuously variable transmission such that an actual speed of said input unit becomes the target speed of said input unit, wherein said setting element includes, a decision element for determining whether or not learning conditions are satisfied with a fully closed throttle, an updating element for updating a learning reference torque when said decision element determines that the learning conditions are satisfied, on the basis of one of a reference torque and the engine torque corresponding to an actual engine output, and a learning reference torque set at the preceding time of satisfying the learning conditions, and a determining element for determining engine output characteristics on the basis of the learning reference torque updated by said updating element.