Internal combustion engine and cogeneration system

Patent metadata

Field	Value
Publication number	US-2016290189-A1
Application number	US-201314777597-A
Country	US
Kind code	A1
Filing date	Dec 12, 2013
Priority date	Mar 19, 2013
Publication date	Oct 6, 2016
Grant date	—

Abstract

An internal combustion engine, which can improve an annual energy consumption efficiency, is provided. A gas engine 1 includes: an oil cooler 11 having a passage via which heat is exchanged between engine cooling water and lubricating oil; and a control unit 12 configured to control a temperature of the engine cooling water to a constant temperature so as to cool the lubricating oil during high load operation and to heat the lubricating oil during low to medium load operation. The control unit 12 increases the temperature of the engine cooling water during low to medium load operation compared with the temperature of the engine cooling water during high load operation. An oil jet 18 a, which is configured to inject the lubricating oil into a rear surface of a piston 17, is provided.

First claim

1 . An internal combustion engine comprising:
an oil cooler having a passage via which heat is exchanged between engine cooling water and lubricating oil; and a control unit configured to control a temperature of the engine cooling water to a constant temperature so as to cool the lubricating oil during high load operation and to heat the lubricating oil during low to medium load operation.

2 . The internal combustion engine according to claim 1 further comprising a circulation passage of the engine cooling water, the circulation passage including:
a heat exchanger disposed in the passage via which the heat is exchanged between the engine cooling water and the lubricating oil, the heat exchanger being configured to cool the engine cooling water;
a cooling water pump configured to allow the engine cooling water to pass through the heat exchanger; and
a bypass passage configured to not pass through but skip and bypass the heat exchanger and the cooling water pump,
wherein the control unit adjusts an operational force of the cooling water pump so as to control the temperature of the engine cooling water to the constant temperature by adjusting an amount of the engine cooling water passing through the heat exchanger and being cooled, and an amount of the engine cooling water passing through the bypass passage and not being cooled.

3 . The internal combustion engine according to claim 2 , wherein the circulation passage is configured so that the engine cooling water passes through an internal combustion engine main body and/or an exhaust passage.

4 . The internal combustion engine according to claim 1 , wherein the control unit increases the temperature of the engine cooling water during low to medium load operation compared with the temperature of the engine cooling water during high load operation.

5 . The internal combustion engine according to claim 2 , wherein the control unit increases the temperature of the engine cooling water during low to medium load operation compared with the temperature of the engine cooling water during high load operation.

6 . The internal combustion engine according to claim 3 , wherein the control unit increases the temperature of the engine cooling water during low to medium load operation compared with the temperature of the engine cooling water during high load operation.

7 . The internal combustion engine according to claim 1 further comprising an oil jet configured to inject the lubricating oil into a rear surface of a piston.

8 . The internal combustion engine according to claim 1 ,
wherein the internal combustion engine is a gas engine for a cogeneration system, and wherein the internal combustion engine operates at low to medium load during a normal operation, and operates at high load during a heat main operation.

9 . The internal combustion engine according to claim 7 ,
wherein the internal combustion engine is a gas engine for a cogeneration system, and wherein the internal combustion engine operates at low to medium load during a normal operation, and operates at high load during a heat main operation.

10 . A cogeneration system using the internal combustion engine according to claim 7 as a drive source.

Assignees

• Yanmar Co Ltd

Inventors

• Nakazono Toru
• Raihan Khandoker Abu
• Okada Hiroyuki

Classifications

• Y02T10/12

  Improving ICE efficiencies · CPC title

• F01P11/08

  Arrangements of lubricant coolers (in lubrication apparatus F01M) · CPC title

• F01M1/08

  Lubricating systems characterised by the provision therein of lubricant jetting means · CPC title

• F01P7/167

  by adjusting the pre-set temperature according to engine parameters, e.g. engine load, engine speed · CPC title

• F01M5/005 Primary

  Controlling temperature of lubricant · CPC title