Patent ID: 6577940
Filing Date: 2003-06-10
Classification: F16H,Y10T

Abstract:
A shift control apparatus of an automatic transmission for a vehicle, including a plurality of frictional engagement elements driven by electromagnetic solenoids wherein hydraulic pressure is applied to the frictional engagement element on the engagement side and hydraulic pressure is discharged from the frictional engagement element on the release side, for shifting an output of an internal combustion engine, said shift control apparatus comprising:hydraulic pressure control means outputting, at a predetermined shifting time, a preparation hydraulic pressure in the frictional engagement element on the engagement side based on a preparation hydraulic pressure previously stored and a previously stored preparation time, and then outputting an engagement hydraulic pressure in the frictional engagement element on the engagement side toward a target hydraulic pressure based on a previously stored engagement hydraulic pressure characteristic; raising occurrence detection means determining whether or not the raising of the rotation speed occurs in the internal combustion engine before an inertia phase starts; and learn correction means performing a hydraulic pressure learn correction to the preparation hydraulic pressure and the engagement hydraulic pressure and a time learn correction to the preparation time at the next predetermined shifting time when said raising occurrence detection means detects the raising of the rotation speed of the internal combustion engine, wherein said learn correction means performs the hydraulic pressure learn correction and the time learn correction based on a predetermined correction ratio.