Patent ID: 7894966

Claim:
An upshift control system for use in an automatic transmission that is configured to perform shifting of a gear ratio in response to an output of a shift command, the automatic transmission including a first friction element and a second friction element and achieving a target gear ratio by engaging the first friction element and disengaging the second friction element, the upshift control system controlling an engagement capacity of the first friction element and an engagement capacity of the second friction element, the upshift control system comprising: a gear ratio detecting section that detects an actual gear ratio of the automatic transmission; an engine racing detecting section that detects occurrence or non-occurrence of engine racing by comparing the actual gear ratio of the automatic transmission with a target gear ratio that is set before the shifting; a first time setting section that sets a first time as a target time which elapses from the output of the shift command to a start of an inertia phase; a second time detecting section that detects a second time that elapses from the output of the shift command to a start of change in the actual gear ratio toward a target gear ratio to be achieved after the shifting; a comparison section that compares lengths between the first time and the second time; a determination section that determines excess or lack of the engagement capacity of the first friction element or excess or lack of the engagement capacity of the second friction element on the basis of the detected occurrence or non-occurrence of engine racing and the compared lengths between the first time and the second time; and a correction section that performs a learning correction of a command pressure for the first friction element or a command pressure for the second friction element on the basis of the determined excess or lack of the engagement capacity of the first friction element or excess or lack of the engagement capacity of the second friction element.