Patent ID: 9458930
Filing Date: 2016-10-04
CPC Classification: F16H

Claim Text:
1. A shift control device for automatic transmission for upshift and downshift controls of gear positions according to a shift map including an upshift line and a downshift line set per gear position, shift control device comprising: a speed control means configured to output upshift and downshift transmission signals according to a first upshift line and a downshift line based on first transmission properties set depending on a vehicle speed and a throttle opening; a downshift judgment means configured to judge, on the basis of the first transmission properties, the downshift transmission signals having been output; a transmission property change means configured to change the first transmission properties to second transmission properties including a second upshift line being the first upshift line shifted to a high vehicle speed side; an operational state detection means configured to detect an operational state of a vehicle; and an upshift permission means configured to permit an upshift according to fulfillment of predetermined conditions when a vehicle speed and a throttle opening is in a range between the first upshift line and the second upshift line, wherein the upshift permission means calculates an allowance driving force of the vehicle when upshifting at a current vehicle speed and throttle opening, then calculates a threshold value of driving force including a throttle opening variation, a vehicle speed variation, a cornering judgment of judging a winding degree of a road with a vehicle kept running thereon, and a gradient judgment of judging a gradient of a road surface with the vehicle kept running thereon, then compares the threshold value with the allowance driving force, and accordingly permits an upshift when the allowance driving force is larger than the threshold value.