Patent ID: 9109479
Filing Date: 2015-08-18
Classification: F01M

Abstract:
1. An engine lubrication control system, comprising: an engine; an oil pump which is driven by the engine; an oil circuit which extends downstream from the oil pump; and a plurality of oil branch supply paths which branch from the oil circuit and supply oil to each part of the engine, wherein an electronically-controlled first hydraulic control valve which controls, in a stepwise manner, a discharge pressure of the oil pump relative to a speed of the engine is disposed on the oil circuit, a hydraulically-driven second hydraulic control valve is disposed on at least one of the plurality of oil branch supply paths, and a downstream hydraulic pressure of the second hydraulic control valve is controlled to be lower than a downstream hydraulic pressure of the first hydraulic control valve of the oil circuit at least across a predetermined engine speed range, wherein the downstream hydraulic pressure of the first hydraulic control valve of the oil circuit is controlled to be substantially the same as the downstream hydraulic pressure of the second hydraulic control valve, at an engine speed that is higher than the predetermined engine speed range.