Speed dependent pressure control for automatic transmission

摘要

A control system for an automatic transmission, comprising: a frictional engagement element (91); adjusted oil pressure producing means (93) for adjusting an oil pressure supplied from an oil pressure source (81) to produce an adjusted oil pressure; a hydraulic servo (92) for applying/releasing the frictional engagement element (91) on the basis of the adjusted oil pressure; engine load detecting means (50); vehicle speed detecting means (51); up-shift deciding means (95) for deciding whether or not an up- shift has been executed; and pressure regulate signal generating means (96) for calculating the pressure regulate target of the adjusted oil pressure, when the up-shift is executed, to output a pressure regulate signal. The adjusted pressure signal producing means (93) corrects the regulate pressure target on the basis of the difference between the present vehicle speed and the vehicle speed at a shift point when the shift is executed under the present engine load.