HYDRAULIC CONTROL DEVICE FOR AUTOMATIC TRANSMISSION

摘要

During pre-shifting of shift control, a line-pressure control means (102) determines a pressure-rise ?PL in a line pressure PL on the basis of a pressure-rise map stored in a memory (101), and controls a linear solenoid valve (204) for line pressure control such that the line pressure PL adjusted by a regulator valve (202) is increased by the pressure-rise ?PL. For example, a control oil pressure corresponding to the pressure-rise ?PL is supplied from the linear solenoid valve (204) for line pressure control to the regulator valve (202). With this, a large amount of working oil supplied from a hydraulic pump is ejected from an output port of the line pressure PL. As a result, a reduction in the line pressure PL can be sufficiently suppressed compared with the case where the line pressure PL is not increased as in the related art although the line pressure PL adjusted inside a line pressure circuit may slightly vary at the start of the stroke of a hydraulic piston (21X).