Patent ID: 8683963

Claim:
A hydraulic control device for an engine, comprising: an oil jet injecting an oil to a piston; an oil passage through which oil injected by the oil jet and oil supplied to a lubrication part of an engine flow; an oil pump pumping the oil to the oil passage; an oil jet passage connecting the oil passage and the oil jet together; an oil lubrication passage connecting the oil passage and the engine lubrication part together; switching means, disposed on the oil jet passage, for selectively supplying the oil to the oil jet through the oil jet passage and returning oil to an upstream side of the oil pump on the basis of an operating condition of the engine: a rotation sensor that measures an engine speed of the engine; and a water temperature sensor that measures a temperature of a cooling water of the engine, wherein the switching means shuts off a passage of oil from the oil passage to the oil jet and a passage of oil from the oil passage to the upstream side of the oil pump in a case where the engine speed measured by the rotation sensor is equal to or lower than a threshold value and the temperature of the cooling water measured by the water temperature sensor is equal to or higher than a threshold value.