Patent ID: 7274983

Claim:
A shift control method of an automatic transmission, comprising: determining whether a sport mode upshifting request is detected; determining, when the sport mode upshifting request is detected, whether upshifting according to a vehicle running condition is under operation; retrieving, when the upshifting according to a vehicle running condition is under operation, an initial turbine speed at the time of starting the upshifting according to the vehicle running state; calculating a first expected turbine speed that is a turbine speed at a shift-finish point of the upshifting according to the vehicle running state; calculating a second expected turbine speed that is a turbine speed at a shift-finish point of the upshifting requested by the sport mode upshifting request; determining if a speed difference between the first and second expected turbine speeds is greater than or equal to a predetermined shift prohibition reference value; and prohibiting the requested sport mode up-shifting if the speed difference is greater than or equal to the predetermined shift prohibition reference value.