How to control the CVT speed ratio

摘要

PROBLEM TO BE SOLVED: To adjust a rapid output/input ratio as the slide of the belt of a continuously variable transmission is prevented from occurring.;SOLUTION: Primary and secondary pulleys operated at primary and secondary pressures (Pp and Ps), respectively, are provided. The primary and secondary pressures move the pulleys, and generate power to adjust a linkage belt by means of a continuously variable transmission (CVT) to regulate the output/input speed ratio. The method for adjusting the CVT speed ratio is provided with a process to calculate the desired force ratio of a CVT plant. The desired primary and secondary pressures are decided partially based on the desired force ratio, and desired Ps and Pp signals are sent to the CVT plant to control its operation. An actual speed ratio is calculated from the measured value of the input/output speed of the CVT plant. An error signal is generated from the actual speed ratio used when a desired force ratio at a next sample time is calculated, and a desired force ratio is used as a control variable when the output/input speed ratio of the CVT plant is controlled.;COPYRIGHT: (C)2004,JPO