System for controlling continuously variable V-belt vehicle gearbox changes first actuation element position if primary pulley pressure has not reached threshold in defined time after engine starting

摘要

The system has primary and secondary pulleys with v-grooves subjected to primary and secondary pulley pressures, a v-belt engaging the grooves, a shift actuation element and an electronic control unit that controls the shift actuation element. The control unit determines if the primary pulley pressure has reached a defined value within a defined period after engine starting and changes a first actuation element position if not. The system has primary and secondary pulleys on the input and sides with v-grooves subjected to primary and secondary pulley pressures generated from a control pressure, a v-belt engaging the grooves, a shift actuation element and an electronic control unit that controls the shift actuation element. The control unit determines if the primary pulley pressure has reached a defined value within a defined period after engine starting and changes a first actuation element position if not. AN An Independent claim is also included for a method of controlling a continuously variable V-band type shift gearbox.