35. A recording medium for use in a hydraulic control system for an automatic transmission comprising an input shaft which receives power from an engine output shaft, an output shaft which is connected to vehicle wheels, a plurality offrictional engagement elements for selectively changing torque transfer from the input shaft to the output shaft between plural torque transfer paths, hydraulic servos that engage and disengage the frictional engagement elements, said hydraulic controlsystem performing an up-shift to a predetermined gear ratio by engaging a first frictional engagement element in the plurality of frictional engagement elements and disengaging a second frictional engagement element in the plurality of frictionalengagement elements, said recording medium being readable by a computer which receives input signals from a hydraulic operating means which controls at least hydraulic pressures applied to hydraulic servos for the first frictional engagement element andthe second frictional engagement element and from sensors which monitor various vehicle operating parameters and which outputs a hydraulic control signal, said recording medium comprising, encoded thereon:
33. The hydraulic control system for an automatic transmission according to claim 1 wherein said disengagement side hydraulic controller calculates base pressures based on an absolute value of the calculated input torque.
The invention relates to a hydraulic control system for an automatic transmission. More specifically, it relates to a hydraulic control system which performs a clutch to clutch shift in which one frictional engagement element is engaged and ananother frictional engagement element is disengaged at the same time to effect a shift to a predetermined gear ratio.
32. The hydraulic control system for an automatic transmission according to claim 1 wherein said predetermined value for calculated input torque is a calculated input torque corresponding to a base pressure of 0.
|Citing Patent||Filing date||Publication date||Applicant||Title|
|EP0059427A2 *||Feb 24, 1982||Sep 8, 1982||Nissan Motor Co., Ltd.||Shift device of hydraulic control system for automatic transmission|
|EP0116898A1 *||Feb 8, 1984||Aug 29, 1984||Nissan Motor Co., Ltd.||Transmission control system including select shock suppressing arrangement|
|EP0133619A1 *||Jul 29, 1983||Mar 6, 1985||Nissan Motor Co., Ltd.||Line pressure control of hydraulic control system for automatic transmission|
|US4563918 *||Jul 29, 1983||Jan 14, 1986||Nissan Motor Co., Ltd.||Line pressure control of hydraulic control system for automatic transmission|
|US4580466 *||Feb 15, 1984||Apr 8, 1986||Nissan Motor Co., Ltd.||Transmission control system including select shock suppressing arrangement|