Patent ID: 6224509
Filing Date: 2001-05-01
Classification: F16H,Y10T

Abstract:
A method for monitoring a continuously variable transmission (CVT) driven by an input unit with a variator for adjustment of speed ratio of a primary adjustment device on the input side and a secondary adjustment device on the output side, with an electrohydraulically controlled primary pressure circuit and an electrohydraulically controlled secondary pressure circuit for pressurizing the variator, for adjusting speed ratio, with a primary pressure-regulating valve for pressurizing the primary adjustment device and a secondary pressure regulating valve, independent of the primary pressure-regulating valve, for pressurizing the secondary adjustment device, wherein one of travel monitoring and pressure monitoring of at least one of the primary pressure regulating valve and the secondary pressure-regulating valve are carried out and in case of detection of an incorrect operation of the pressure-regulating valves, the power flow into the transmission is interrupted.