Patent ID: 8202197

Claim:
A hydraulic pressure control apparatus, comprising: a first regulation unit that regulates a pressure discharged from an oil pump to form a line pressure that is used as an original pressure for a hydraulic pressure that is supplied to each element; and a second regulation unit that is provided downstream of the first regulation unit, and that regulates a hydraulic pressure downstream of the first regulation unit to form a secondary pressure, wherein at least two pilot pressures are supplied to the second regulation unit, and the second regulation unit is configured in such a manner that when one of the pilot pressures changes, a change in the one of the pilot pressures is absorbed by the other pilot pressure, and wherein the second regulation unit includes a spool that is moved based on the pilot pressure and a hydraulic pressure that is supplied to a port which is communicated with an oil passage located downstream of the first regulation unit, and when one of the pilot pressures changes, the other pilot pressure changes in such a manner that a change in a resultant of the pilot pressures applied to the spool is minimized.