Patent ID: 6679808
Filing Date: 2004-01-20
Classification: F16H,Y10T

Abstract:
A starting shift control system for a continuously variable transmission for a vehicle, comprising:an input rotation detector for detecting an input rotation of the transmission and producing input rotation pulses at repetition periods corresponding to the input rotation; an output rotation detector for detecting an output rotation of the transmission drivingly connected to a prime mover of the vehicle and producing output rotation pulses at repetition periods corresponding to the output rotation; and a control unit for calculating an actual gear ratio of the transmission on the basis of the input rotation pulses and the output rotation pulses and controlling so that the actual gear ratio becomes equal to a target gear ratio; wherein the control unit includes a high start judgment device for judging whether or not a start of the vehicle is a high start in which the actual gear ratio at the start of the vehicle is a high speed side gear ratio by comparison between the number of the input rotation pulses and the number of the output rotation pulses from the time a first vehicle starting operation is made after start of the prime mover, and a high start control device for restricting downshifting from the high speed side gear ratio to the target gear ratio when the start of the vehicle is judged to be the high start.