Patent ID: 8585549

Claim:
A hydraulic pressure control apparatus for an automatic transmission, the automatic transmission being mounted in a vehicle which makes an engine stop under a predetermined stop condition and makes the engine restart under a predetermined start condition, the hydraulic pressure control apparatus comprising: pressure accumulating means connected to a hydraulic pressure supply passage directed toward a clutch of the automatic transmission via an electromagnetic cut-off valve, the clutch being engaged at a time of a start of the vehicle; pressure holding means for holding a working hydraulic pressure of the clutch at a predetermined value; and control means for controlling the electromagnetic cut-off valve, wherein the control means, at a time of the engine stop, cuts off the pressure accumulating means from the hydraulic pressure supply passage to hold the hydraulic pressure of the hydraulic pressure supply passage at the predetermined value through the pressure holding means and, at a time of a restart of the engine, discharges a working oil charged in the pressure accumulating means into the hydraulic pressure supply passage through the electromagnetic cut-off valve.