To provide a hydraulic pressure control device of an automatic transmission capable of preventing occurrence of any slip in a frictional engagement element and degradation of the efficiency of the automatic transmission while enhancing responsiveness of the hydraulic pressure control.
A current control unit 36 to control the solenoid current to control the line pressure to be fed to a frictional engagement element includes a first controller 52 and a second controller 54. The first controller 52 is designed to be the control gain with priority placed on the responsiveness, and the second controller 54 is designed to be the control gain with priority placed on the stability. The current control unit 36 performs the feedback control by the first controller 52 when the line pressure is controlled in the pressure-increasing direction and performs the feedback control by the second controller 54 when the line pressure is controlled in the pressure-decreasing direction.
Toshio Morita
Takao Matsuyama
Tadashi Muto
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