Patent ID: 6508736
Filing Date: 2003-01-21
Classification: F16H,Y10T

Abstract:
A shift control apparatus for an automatic transmission comprising first and second friction engagement elements to be selectively engaged and disengaged to select one of gear ratios, the shift control apparatus comprising a shift controller configured:to govern a first shift operation to effect a first gear shift by engaging the first friction element by increasing a first fluid pressure and instead by disengaging the second friction element by decreasing a second fluid pressure; to measure a time from a start of an inertia phase in the first gear shift; to check if an end of the inertia phase is not detected within a predetermined first time interval from the start of the inertia phase; and to forcibly increase the first fluid pressure at a predetermined gradual rate if an end of the inertia phase is not detected within the predetermined first time interval from the start of the inertia phase.