Patent ID: 6622075
Filing Date: 2003-09-16
Classification: F16H,Y10T

Abstract:
A method for regulating the transmission ratio of a continuously variable transmission for motor vehicles, to take into account changes in transmission operation over time, including changes caused by wear of transmission parts, said method comprising the steps of:a. providing a preliminary transmission ratio control value as a function of at least two transmission operating parameters; b. providing a set point transmission ratio value for the transmission as a function of operating parameters of a power train, wherein the set point value is composed of the preliminary transmission ratio control value and a correction value; c. deriving the correction value by comparing a measured transmission ratio with the set point transmission ratio value of said transmission; and d. adjusting the preliminary transmission ratio control value as a function of at least two transmission operating parameters based upon the correction value, to account for changes that occur during transmission operation over time.