Engine oil state control device

Patent metadata

Field	Value
Publication number	US-11530631-B2
Application number	US-201716628959-A
Country	US
Kind code	B2
Filing date	Oct 27, 2017
Priority date	Oct 27, 2017
Publication date	Dec 20, 2022
Grant date	Dec 20, 2022

Abstract

An engine oil state control device for controlling a fuel mixture ratio of a fuel mixed in an engine oil of an engine on which a predetermined combustion control is performed includes comprising a fuel mixture ratio acquisition part configured to acquire the fuel mixture ratio, and an oil temperature rise control part configured to perform an oil temperature rise control for increasing an evaporation rate of the fuel mixed in the engine oil if the fuel mixture ratio is equal to or greater than a first threshold.

First claim

The invention claimed is:

1. An engine oil state control device for controlling a fuel mixture ratio of a fuel mixed in an engine oil of an engine on which a predetermined combustion control is performed, comprising:
a fuel mixture ratio acquisition part configured to acquire the fuel mixture ratio,
an oil temperature rise control part configured to perform an oil temperature rise control for increasing an evaporation rate of the fuel mixed in the engine oil if the fuel mixture ratio is equal to or greater than a first threshold; and
an output decrease control part configured to perform an output decrease control for decreasing an output power of the engine compared to an output power when the predetermined combustion control is performed, if the fuel mixture ratio is equal to or greater than a second threshold, the second threshold being greater than the first threshold,
wherein the oil temperature rise control includes a control for increasing a fuel injection amount during an idling, only if th e fuel mixture ratio is equal to or greater than the first threshold and less than the second threshold, by increasing a set value of an idling speed of the engine so that an amount of heat due to combustion of the fuel during the idling is increased.

2. The engine oil state control device according to claim 1 ,
wherein the oil temperature rise control includes an output increase control for increasing an output power of the engine compared to an output power when the predetermined combustion control is performed.

3. The engine oil state control device according to claim 1 ,
wherein the oil temperature rise control includes a combustion temperature rise control for increasing a combustion temperature in a cylinder of the engine compared to a combustion temperature in the cylinder when the predetermined combustion control is performed.

4. The engine oil state control device according to claim 3 ,
wherein the combustion temperature rise control includes at least one of a control for decreasing an air excess ratio of the engine compared to an air excess ratio determined in accordance with the predetermined combustion control, or a control for increasing an EGR rate of the engine compared to an EGR rate determined in accordance with the predetermined combustion control.

5. The engine oil state control device according to claim 1 ,
wherein the engine includes:
an oil circulation line through which the engine oil circulates;
an oil cooler, disposed on the oil circulation line, for cooling the engine oil; and
a cooler bypass line bypassing the oil cooler and connecting portions of the oil circulation line upstream and downstream of the oil cooler, and

wherein the oil temperature rise control includes a control for increasing a flow rate of the engine oil flowing through the cooler bypass line compared to a flow rate of the engine oil flowing through the cooler bypass line when the predetermined combustion control is performed.

6. The engine oil state control device according to claim 1 ,
wherein the engine includes:
a cooling water circulation line through which cooling water circulates;
a radiator, disposed on the cooling water circulation line, for cooling the cooling water; and
a radiator bypass line bypassing the radiator and connecting portions of the cooling water circulation line upstream and downstream of the radiator, and

wherein the oil temperature rise control includes a control for increasing a flow rate of the cooling water flowing through the radiator bypass line compared to a flow rate of the cooling water flowing through the radiator bypass line when the predetermined combustion control is performed.

7. The engine oil state control device according to claim 1 ,
wherein the engine includes:
a cooling water circulation line through which cooling water circulates;
a radiator, disposed on the cooling water circulation line, for cooling the cooling water; and
a heater disposed on the cooling water circulation line, and

wherein the oil temperature rise control includes a control for operating the heater.

8. The engine oil state control device according to claim 1 ,
wherein the engine includes an oil viscosity sensor for detecting a viscosity of the engine oil, and
wherein the fuel mixture ratio acquisition part calculates the fuel mixture ratio from the viscosity of the engine oil detected by the oil viscosity sensor, based on a map showing a relationship between the viscosity of the engine oil and the fuel mixture ratio.

9. The engine oil state control device according to claim 1 ,
wherein the engine includes:
an exhaust gas treatment device including a diesel particulate filter, disposed in an exhaust passage of the engine, for collecting particles in an exhaust gas and a diesel oxidation catalyst disposed upstream of the diesel particulate filter; and
a forced regeneration control part configured to, if a predetermined execution condition is satisfied, inject a fuel at a timing that does not contribute to combustion in a combustion chamber of the engine to perform a forced regeneration treatment on the diesel particulate filter.

10. An engine oil state control device for controlling a fuel mixture ratio of a fuel mixed in an engine oil of an engine
on which a predetermined combustion control is performed, comprising:
a fuel mixture ratio acquisition part configured to acquire the fuel mixture ratio; and
an oil temperature rise control part configured to perform an oil temperature rise control for increasing an evaporation rate of the fuel mixed in the engine oil if the fuel mixture ratio is equal to or greater than a first threshold,
wherein the oil temperature rise control includes a combustion temperature rise control for increasing a combustion temperature in a cylinder of the engine compared to a combustion temperature in the cylinder when the predetermined combustion control is performed,
wherein the combustion temperature rise control includes at least one of a control for decreasing an air excess ratio of the engine compared to an air excess ratio determined in accordance with the predetermined combustion control, or a control for increasing an EGR rate of the engine compared to an EGR rate determined in accordance with the predetermined combustion control.

11. The engine oil state control device according to claim 10 ,
wherein the oil temperature rise control includes an output increase control for increasing an output power of the engine compared to an output power when the predetermined combustion control is performed.

12. The engine oil state control device according to claim 10 ,
wherein the engine includes:
an oil circulation line through which the engine oil circulates;
an oil cooler, disposed on the oil circulation line, for cooling the engine oil; and
a cooler bypass line bypassing the oil cooler and connecting portions of the oil circulation line upstream and downstream of the oil cooler, and
wherein the oil temperature rise control includes a control for increasing a flow rate of the engine oil flowing through the cooler bypass line compared to a flow rate of the engine oil flowing through the cooler bypass line when the predetermined combustion control is performed.

13. The engine oil state control device according to claim 10 ,
wherein the engine includes:
a cooling water circulation line through which cooling water circulates;
a radiator, disposed on the cooling water circulation line, for cooling the cooling water; and
a radiator bypass line bypassing the radiator and connecting portions of the cooling water circulation line upstream and downstream of the radiator, and

Assignees

• Mitsubishi Heavy Ind Engine & Turbocharger Ltd

Inventors

• Yamamoto Takayuki
• Kumagai Takuya
• Yamada Tomohide
• Nishizawa Kazuki

Classifications

• Y02T10/40

  Engine management systems · CPC title

• F02D41/005

  according to engine operating conditions · CPC title

• F01M5/005

  Controlling temperature of lubricant · CPC title

• F02D2200/021

  Engine temperature · CPC title

• F02D2250/11

  Oil dilution, i.e. prevention thereof or special controls according thereto · CPC title