Engine oil supply apparatus

• US 10,267,190 B2
• Filed: 08/17/2015
• Issued: 04/23/2019
• Est. Priority Date: 08/27/2014
• Status: Active Grant

• Current Assignee: Mazda Motor Corporation
• Original Assignee: Mazda Motor Corporation
• Inventors: Koguchi, Tomohiro, Honda, Kenta
• Primary Examiner(s): Amick, Jacob
• Assistant Examiner(s): Brauch, Charles
• Application Number:
  US15/022,803
• Publication Number:
  US 20160222843A1
• Time in Patent Office: 1,345 Days
• CPC Class Codes: F01M 1/02 using lubricating pumps pumps in general F04; lubricating pumps per se F16N
• CPC Class Codes: F01M 1/08 Lubricating systems characterised by the provision therein of lubricant jetting means
• CPC Class Codes: F01M 1/16 Controlling lubricant pressure or quantity rendering machines or engines inoperative or idling on lubricant pressure failure F01M1/22
• CPC Class Codes: F01M 11/02 Arrangements of lubricant conduits
• CPC Class Codes: F01M 5/002 Cooling
• CPC Class Codes: F16N 2280/00 Valves

Abstract

An engine oil supply apparatus includes: an oil pump; an oil supply path which supplies oil to a hydraulic operating section of an engine; an oil cooler which is provided on the oil supply path and which cools oil discharged from the oil pump; and a control apparatus which sets a required oil pressure required from the hydraulic operating section in accordance with an operation state of the engine, as a target oil pressure, and controls the discharge amount of the oil pump so that an oil pressure inside the oil supply path equals the target oil pressure. The control apparatus controls the oil pump so that, during an operation state of the engine where the oil enters a prescribed high oil temperature state, the oil is discharged in an amount exceeding a discharge amount corresponding to the required oil pressure of the hydraulic operating section.

Claims

1. An engine oil supply apparatus comprising:

at least one hydraulic operating section of the engine;

a variable displacement oil pump, the discharge amount of which can be controlled;

an oil supply path, which is connected to the variable displacement oil pump and all of the hydraulic operating sections, and supplies oil discharged from the variable displacement oil pump to all of the hydraulic operating sections;

an oil cooler which is provided between the variable displacement oil pump and the hydraulic operating section on the oil supply path and which cools oil discharged from the variable displacement oil pump; and

a controller which is connected to an oil temperature sensor and the variable displacement oil pump, the controller detects an oil temperature from the oil temperature sensor, the controller sets a required oil pressure required from the all of the hydraulic operating section in accordance with an operation state of the engine, as a target oil pressure, and controls the discharge amount of the variable displacement oil pump so that an oil pressure inside the oil supply path equals the target oil pressure, wherein

the controller revises the target oil pressure and sets an oil cooling required oil pressure and controls the variable displacement oil pump to perform the oil cooling required oil pressure and to make discharge amount of oil exceed a discharge amount corresponding to the required oil pressure of the hydraulic operating section in accordance with the operation state of the engine, during an operation state of the engine where the oil enters a prescribed high oil temperature state,

the oil cooling-required oil pressure makes discharge amount of oil exceed a discharge amount corresponding to the required oil pressure of the hydraulic operating section in accordance with the operation state of the engine, and the oil cooling-required oil pressure is higher than the required oil pressure of all of the hydraulic operating sections.

2. The engine oil supply apparatus according to claim 1, wherein

when the at least one hydraulic operating section includes a first hydraulic operating section,

the oil supply path includes an upstream-side oil path which supplies oil discharged from the variable displacement oil pump to the first hydraulic operating section, and a downstream-side oil path which is connected to the upstream-side oil path and which supplies oil to a second hydraulic operating section whose required oil pressure is lower than that of the first hydraulic operating section,

the downstream-side oil path is provided with an oil pressure sensor which detects an oil pressure in the downstream-side oil path and a variable orifice, and

when causing the variable displacement oil pump to discharge oil in an amount exceeding a discharge amount corresponding to the target oil pressure, the controller controls the variable orifice so as to adjust the oil pressure of the downstream-side oil path in accordance with a required oil pressure of the first hydraulic operating section.

3. The engine oil supply apparatus according to claim 1, wherein the oil temperature sensor detects an oil temperature in the oil supply path, and

the controller determines that the engine is in the operation state where the high-oil temperature state is created when the oil temperature detected by the oil temperature sensor is equal to or higher than a prescribed temperature.

4. The engine oil supply apparatus according to claim 1, further comprising an oil supplier which is connected to the oil supply path and which injects oil to a piston when a specific operation state having at least one of a prescribed engine revolution or higher and a prescribed engine load or higher is established, wherein

the controller determines that the engine is in the operation state where the high-oil temperature state is created, when the specific operation state is established.