Patent ID: 6547698
Filing Date: 2003-04-15
Classification: F16H,Y10T

Abstract:
A system for controlling an automatic transmission of a vehicle having an input shaft connected to an internal combustion engine mounted on the vehicle and an output shaft connected to driven wheels of the vehicle, the transmission transmitting input torque, through any of frictional engaging elements, generated by the engine and inputted by the input shaft to the driven wheels by the output shaft, comprising;destined gear retrieving means for retrieving a destined gear to be engaged to in accordance with predetermined shift scheduling map based on detected operating conditions of the vehicle and the engine in response to a shift command; shift mode determining means for determining a shift mode based on the destined gear and a current gear currently engaged, such that the destined gear is established; hydraulic pressure command value determining means for determining hydraulic pressure command value to be supplied to any of the frictional engaging elements based on the determined shift mode; degree of shift progress detecting means for detecting a degree of shift progress in shifting from the current gear to the destined gear; destined gear change possibility determining means for determining, if the shifting from the current gear to the destined gear is downshifting, whether change of the destined gear is possible when the downshifting is in progress, by comparing the degree of shift progress with a predetermined first threshold value; destined gear change permission determining means for determining a permission of the change of the destined gear when the change of the destined gear is determined to be possible; and destined gear determining means for determining the destined gear based on the permission of the change of the destined gear; wherein: the shift mode determining means includes: second threshold value comparing means for comparing the degree of shift progress with a predetermined second threshold value, when the downshifting is two-gear downshifting; and determines the shift mode such that the destined gear is established in an upshifting direction.