Oil pressure control device
AssigneeIsuzu Motors Limited
InventorsYuuichi Murata, Ken Suzuki, Kouji Hashimoto
Life of this patent
Estimating the term…
Abstract
This oil pressure control device is provided with: an oil cooler which cools engine oil circulating through a hydraulic circuit of an engine; a bypass oil passage which bypasses the oil cooler; an oil cooler bypass valve by means of which an engine oil flow passage is switched between the oil cooler and the bypass oil passage; an oil pressure sensor which measures a first oil pressure, which is the oil pressure of engine oil; and a valve control unit which controls opening and closing of the oil cooler bypass valve to reduce the magnitude of a difference between the first oil pressure and a second oil pressure, which is a target oil pressure determined on the basis of the rotational speed of the engine and a fuel injection quantity.
Claims5
An oil pressure control apparatus, comprising:
- an oil cooler that cools engine oil that circulates in a hydraulic circuit of an engine;
- a bypass oilway that bypasses the oil cooler;
- an oil-cooler bypassing valve that switches a channel of the engine oil between a channel through the oil cooler and a channel through the bypass oilway;
- an oil pressure sensor that measures a first oil pressure that is an oil pressure of the engine oil;
- and
- a valve control section that performs operations including opening and closing of the oil-cooler bypassing valve so as to reduce a magnitude of a difference value between the first oil pressure and a second oil pressure that is a target oil pressure determined based on an engine speed and a fuel injection quantity of the engine,
- wherein the valve control section performs one of the operations of opening and closing of the oil-cooler bypassing valve when the magnitude of the difference value is equal to or greater than a predetermined proportion of the second oil pressure, and
- wherein the valve control section does not perform the operations of opening or closing of the oil-cooler bypassing valve when the magnitude of the difference value is less than the predetermined proportion of the second oil pressure.
Dependencies are inferred from the claim text.