Patent ID: 6436003
Filing Date: 2002-08-20
Classification: F16H,Y10T

Abstract:
Process for controlling a CVT (continuously variable transmission) installed in a drive train of a motor vehicle between a drive engine and a drive axle with a driven primary disk and a secondary disk of which at least one is variable in its active diameter and which together are surrounded by a surrounding organ for transmitting a torque, an electronic control device registering and monitoring the rpm signals of the primary disk and secondary disk, and actuators for adjusting the effective diameter of the primary and/or secondary disk and with it the transmission ratio of the CVT as a function of these rpm and of at least the position of an accelerator pedal, characterized by the following steps:in the case of a change in the accelerator pedal position it checks whether this change is within a value (a) relevant for a driving behavior or lies above it (1), in which case only when the value is above it does it intervene in the regulation of the transmission ratio of the CVT in the form of a change in transmission ratio (4); if it is found that the change in the accelerator pedal position is below a value (a) relevant for the driving behavior, it checks whether a driving speed (S) has changed to above a calibrated range around the current driving speed or remains within this calibrated range (S12) (2) in which case only upon the recognition of a change in driving speed outside of the calibrated range (S12) does it intervene immediately in the regulation of the transmission ratio in the form to a change in the transmission ratio (4) of the CVT; if it is found that the change in the driving speed remains within the calibrated range (S12) it does not intervene in the regulation of the CVT in the form of a transmission ratio change, and the existing transmission ratio remains constant (3).