Patent ID: 9702381
Date: 2017-07-11
CPC Classifications: F15B,F16H

Claim:
1. A hydraulic control system comprising: a first oil passage; a mechanical oil pump disposed in the first oil passage, the mechanical oil pump configured to be driven with power of an engine; a second oil passage bypassing the mechanical oil pump, the second oil passage including an intake oil passage and a discharge oil passage, the intake oil passage and the first oil passage being connected to each other at a connection point, and the discharge oil passage including an air vent hole; an electric oil pump disposed in the second oil passage, the electric oil pump configured to be driven with power of a motor, the electric oil pump configured to take in oil from the intake oil passage, and the electric oil pump configured to discharge the oil into the discharge oil passage; and a check valve being provided between the connection point and the air vent hole, the check valve configured to restrict flow of the oil from the air vent hole toward the connection point via the electric oil pump.