Patent ID: 6997837
Filing Date: 2006-02-14
Classification: F16H,Y10T

Abstract:
1. A shift control system of an automatic transmission for a vehicle, the automatic transmission serving to automatically select a gear stage in response to an engaging operation of one of friction elements, the shift control system outputting a command value so as to generate a required torque for the one of friction elements during a shifting operation based on a required torque value determined in accordance with a preliminarily stored relationship, the shift control system comprising a controller that: gradually decreases an engaging torque applied to a predetermined friction element which has been engaged to establish the selected gear stage of the automatic transmission during running of the vehicle; stores the engaging torque applied to the predetermined friction element upon generation of a slip caused by gradually decreasing the engaging torque of the predetermined friction element, and the command value for generating the engaging torque; and corrects the preliminarily stored relationship based on the stored engaging torque applied to the predetermined friction element upon generation of the slip and the stored command value for generating the engaging torque.