Patent ID: 7806790
Filing Date: 2010-10-05
Classification: F16H,Y10T

Abstract:
1. A slippage detection system for a continuously variable transmission capable of continuously changing a ratio between an input rotation speed of an input member and an output rotation speed of an output member, comprising: a correlation coefficient calculator configured to calculate a correlation coefficient relating to the input rotation speed and the output rotation speed, based on a plurality of measurement values of the input rotation speed and a plurality of measurement values of the output rotation speed; and a slippage determining portion configured to determine slippage in the continuously variable transmission based on the correlation coefficient calculated by the correlation coefficient calculator, wherein the slippage determining portion determines slippage in the continuously variable transmission when the correlation coefficient calculated by the correlation coefficient calculator is smaller than a predetermined reference value, wherein the slippage determining portion sets the reference value based on an operating state of a vehicle in which the continuously variable transmission is installed, and wherein the reference value set by the slippage determining portion decreases as at least one of a rate of change of an accelerator operation amount and a rate of change of a vehicle speed increases.