Patent ID: 7610137

Claim:
A shift control method for an automatic transmission using a shift pattern including at least one vehicle-speed-relevant shift line and at least one throttle-opening-relevant shift line for specific gear-shifting depending on vehicle speed and throttle opening, comprising: selecting a shift line from the at least one vehicle-speed-relevant shift line and the at least one throttle-opening-relevant shift line, on the basis of a vehicle speed change and a throttle opening change for a predetermined time; and performing a shift control according to the selected shift line, wherein the selecting comprises: calculating the vehicle speed change and the throttle opening change for the predetermined time; selecting one reference gradient from a plurality of predetermined reference gradients, on the basis of the calculated vehicle speed change and the calculated throttle opening change; and selecting one shift line from the at least one vehicle-speed-relevant shift line and the at least one throttle-opening-relevant shift line on the basis of a comparison of an operating point changing gradient and the selected reference gradient, the operating point changing gradient being calculated as a ratio of the calculated throttle opening change to the vehicle speed change.