Versorgungsdrucksteuerung für ein Automatik-Getriebe.

摘要

A line pressure control system for an automatic transmission including a multiple shift stage transmission gear mechanism having a plurality of power transmitting paths of different speed ratios, line pressure control device for controlling a line pressure for frictional elements of the transmission gear mechanism associated with each other to establish a desirable shift gear stage, shift period detecting means for detecting a time period for a shift operation accomplished in terms of operation of the frictional element controlled by the line pressure, first compensating device for controlling the line pressure in terms of a learning control in a manner that the time period for the shift operation is controlled to a target value, abnormality detecting device for detecting an abrupt change such as turbine speed raising, depression or driving torque depression in operating condition of the transmission, and second compensating device for compensating the line pressure prior to compensation of the line pressure by the first compensating means when the abrupt change is detected. The torque shock can be effectively obviated during shift operation.