Patent ID: 6893379

Claim:
A hydraulic pressure control apparatus which executes a predetermined upshift by increasing an engaging pressure of a predetermined hydraulic frictional engagement device in a vehicular automatic transmission that shifts speeds by selectively engaging a plurality of hydraulic frictional engagement devices, comprising: a first determining device that determines whether control for the predetermined upshift has been started while an accelerator pedal was not being depressed; a second determining device that determines whether a factor that changes an input torque of the automatic transmission has been generated; and a controller that corrects the engaging pressure of the predetermined hydraulic frictional engagement device by a correction amount in accordance with the factor that changes the input torque when i) it has been determined by the first determining device that the control for the predetermined upshift has been started while the accelerator pedal was not being depressed, and ii) it has been determined by the second determining device that the factor that changes the input torque of the automatic transmission has been generated.