METHOD FOR CONTROLLING ACTUATION PRESSURE OF AN ACTUATOR IN AN ELECTROHYDRAULICALLY CONTROLLED VEHICLE TRANSMISSION

摘要

A description is given of a method for controlling the actuation pressure of an actuator (shifting element) of an electrohydraulically controlled transmission of a motor vehicle during a change of the gear stage. Preferably in the case of down shifts in overrun operation, the hydraulic pressure in the transmission is increased for a limited period of time via the pressure control valve upon initiation of the shift operation. Starting from a presettable or preset base value, the level of this charging pulse is automatically matched in steps to a target value in the course of each control process in such a way that an input speed of the transmission or a speed of an engine connected to the input side of the transmission follows a predetermined sequence of motion.