HYDRAULIKSTEUERUNG FUER AUTOMATIKGETRIEBE

摘要

A hydraulic control system comprising frictional device provided with pistons and a pair of frictional members controlled to be moved between an engaged position in which the frictional members are frictionally engaged with each other and a disengaged position in which the frictional members are disengaged from each other by a hydraulic pressure so as to switch a power transmitting path in the automatic transmission for accomplishing a gear shift operation among the plurality of the shift gear stages, a hydraulic supply means for applying the hydraulic pressure to the piston. A restriction control is carried out in a manner that an increase of the hydraulic pressure is restricted by a predetermined period at an initial stage of the gear shift operation wherein the frictional members are being moved to the engaged position and producing an initial engaging force therebetween.