KR20150092302A - Cooling system and method for an internal combustion engine - Google Patents

Cooling system and method for an internal combustion engine Download PDF

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Publication number
KR20150092302A
KR20150092302A KR1020157018189A KR20157018189A KR20150092302A KR 20150092302 A KR20150092302 A KR 20150092302A KR 1020157018189 A KR1020157018189 A KR 1020157018189A KR 20157018189 A KR20157018189 A KR 20157018189A KR 20150092302 A KR20150092302 A KR 20150092302A
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KR
South Korea
Prior art keywords
cooling
circuit
cooling circuit
heat exchanger
cooling medium
Prior art date
Application number
KR1020157018189A
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Korean (ko)
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KR101946683B1 (en
Inventor
파올로 칼치노토
루치아노 페리넬
Original Assignee
바르실라 핀랜드 오이
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Publication of KR101946683B1 publication Critical patent/KR101946683B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/20—Cooling circuits not specific to a single part of engine or machine
    • F01P3/207—Cooling circuits not specific to a single part of engine or machine liquid-to-liquid heat-exchanging relative to marine vessels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/165—Controlling of coolant flow the coolant being liquid by thermostatic control characterised by systems with two or more loops
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2050/00—Applications
    • F01P2050/02—Marine engines
    • F01P2050/06—Marine engines using liquid-to-liquid heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/02—Intercooler
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/04—Lubricant cooler

Abstract

The cooling system for the internal combustion engine 1 includes a high temperature cooling circuit 2, a low temperature cooling circuit 3 and a heat exchanger 4 for transferring heat from the high temperature cooling circuit 2 to the low temperature cooling circuit 3 .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a cooling system and a cooling system for an internal combustion engine,

The present invention relates to a cooling system for an internal combustion engine according to the preamble of claim 1. The present invention also relates to a method of cooling a cooling medium of a hot-air cooling circuit of an internal combustion engine according to the preamble of another independent claim.

Large internal combustion engines, such as marine or powerplant engines, are often provided with two separate cooling circuits, namely high temperature (HT) and low temperature (LT) circuits. HT circuit is used to control the temperature of the cylinder liners and the cylinder heads. The HT circuit is also connected to the high temperature section of the charge air cooler. The LT circuit is used for the low temperature part of the supply cooler and the lubricant cooler. The temperature in the HT circuit is typically about 70 to 102 DEG C, depending on the engine type, and 38 to 50 DEG C in the LT circuit. The relatively high temperature in the HT circuit is used to ensure safe ignition and combustion of low quality heavy fuels even at low loads, to minimize temperature fluctuations in the components of the cylinders, and to prevent corrosion which may be caused by excessive cooling desirable.

In particular, in modern four-stroke engines, performance gains have been greatly enhanced by more efficient and more powerful superchargers. High air supply pressures cause high air supply temperatures prior to supply air coolers. Its direct consequence is to increase the temperature of the cooling medium in the HT circuit. If the temperature of the cooling medium rises above 100 ° C, there is a risk that the cooling medium will boil at low pressure portions of the HT circuit. The increased temperature of the cooling medium in the HT circuit is problematic, especially in engines upgraded by more efficient superchargers. The temperature of the cooling medium can be lowered by increasing the flow rate in the HT circuit, but this is usually not economical and, in many cases, even possible due to the sizing of the components of the cooling system.

It is an object of the present invention to provide an improved cooling system for an internal combustion engine. The characteristic features of the cooling system according to the invention are given in the characterizing part of claim 1. It is another object of the present invention to provide an improved method of reducing the temperature of the cooling medium of a hot cooling circuit of an internal combustion engine. The characteristic features of the method are given in the characterizing parts of other dependent claims.

The cooling system according to the present invention comprises a hot and cold cooling circuit. The cooling system is provided with a heat exchanger for transferring heat from the high temperature cooling circuit to the low temperature cooling circuit.

In the process according to the present application, the cooling medium of the hot-air cooling circuit is guided through a heat exchanger in which heat is transferred from the cooling medium of the hot-cold circuit to the cooling medium of the cold-

By means of the cooling system and the cooling method, the temperature of the cooling medium in the high temperature cooling circuit can be maintained within the desired temperature limits without modification of the external components of the cooling system. The cooling system can be readily applied to conventional engines that have been upgraded to more efficient supercharging systems.

According to one embodiment of the invention, the cooling medium of the hot-air cooling circuit and the cooling medium of the cold-cooling circuit may be arranged to flow through the heat exchanger. According to another embodiment of the invention, the heat exchanger is arranged in a cryogenic cooling circuit, and the high temperature cooling circuit is provided with means for selectively guiding the cooling medium through a heat exchanger. The means for selectively guiding the cooling medium through the heat exchanger may include a selector valve that allows bypassing of the heat exchanger.

BRIEF DESCRIPTION OF THE DRAWINGS Embodiments of the invention will now be described more fully hereinafter with reference to the accompanying drawings.

Fig. 1 schematically shows a cooling system of an internal combustion engine.

Fig. 1 schematically shows the cooling system of the internal combustion engine 1. As shown in Fig. The engine 1 is a large internal combustion engine such as an engine used in a power plant for generating electricity or a main or auxiliary engine of a ship. The cooling system of the engine (1) includes two separate cooling circuits (2, 3). Both cooling circuits 2, 3 are closed circuits. One of the cooling circuits 2 and 3 is a high temperature cooling circuit 2 and the other is a low temperature cooling circuit 3 in which the temperature of the cooling medium is lower than that of the high temperature cooling circuit 2. The temperature in the high temperature cooling circuit 2 is usually about 70 to 105 DEG C, and in the low temperature cooling circuit is 35 to 55 DEG C. [ The cooling medium in the cooling circuits 2, 3 may be, for example, water. The cooling medium may also include additives for example to prevent corrosion. Each of the cooling medium circuits 2, 3 is provided with a pump 8, 9 for circulating the cooling medium. In the illustrated embodiment, the cooling system is additionally provided with an external cooling circuit 13, where the heat is transferred from the hot and cold cooling circuits 2, 3 to the external cooling circuit 13. However, it is also possible to provide heat exchangers in the hot and cold cooling circuits 2, 3, where the heat is transferred to the cooling air or water, in which case the external cooling circuit 13 may not be necessary. The external cooling circuit (13) is provided with a pump (12) for circulating the cooling medium in this circuit (13). The external cooling circuit 13 also includes a low temperature heat exchanger 15 and a high temperature cooling circuit 2 for transferring heat from the low temperature cooling circuit 3 to the external cooling circuit 13, And a high-temperature heat exchanger (16) for delivering the heat. The high temperature heat exchanger (16) is arranged in the flow direction of the cooling medium of the external cooling circuit (13) after the low temperature heat exchanger (15). The external cooling circuit 13 may be an open circuit or a closed circuit. The external cooling circuit 13 may comprise one or more additional heat exchangers for transferring heat away from the cooling medium of the external cooling circuit 13. [

In the high temperature refrigeration circuit 2, the cooling medium flows from the pump 8 to the engine 1, where heat is transferred from the cylinder liners and cylinder heads of the engine 1 to the cooling medium. From the engine 1, the cooling medium of the high temperature cooling circuit 2 flows to the first supply cooler 7. The first supply air cooler 7 is connected to the compressor 11 of the turbocharger 17. In the first supply air cooler 7, heat is transferred from the supply air to the cooling medium of the hot-air cooling circuit 2. If the engine 1 is provided with a two-stage supercharger, the first air cooler 7 can also be arranged between the two stages. The pressure in the high temperature cooling circuit 2 is typically about 2.5 bar after the first supply cooler 7. From the first supply air cooler 7, the cooling medium flows to the high temperature heat exchanger 16, where heat is transferred from the cooling medium of the high temperature cooling circuit 2 to the cooling medium of the external cooling circuit 13. Thereafter, the cooling medium of the high temperature cooling circuit 2 is returned to the pump 8 at a low temperature. The pressure of the cooling medium is typically about 1.5 bar at this stage.

In the cryogenic cooling circuit 3, the cooling medium flows from the pump 9 to the second supply cooler 10. The second supply air cooler 10 is arranged on the downstream side from the first supply air cooler 7 in the flow direction of the air supply. In the second supply air cooler 10, heat is transferred from the supply air to the cooling medium of the cryogenic cooling circuit 3. The pressure in the cryogenic cooling circuit 3 is typically about 2.5 bar after the second supply cooler 10. From the second supply air cooler 10, the supply air is guided to the intake manifold of the engine 1. The cooling medium is conducted from the second supply cooler 10 to the lubricating oil cooler 14 where the heat is transferred from the lubricating oil of the engine 1 to the cooling medium of the low temperature cooling circuit 3. From the lubricant cooler 14, the cooling medium flows to the low temperature heat exchanger 15, where heat is transferred from the cooling medium of the low temperature cooling circuit 3 to the external cooling circuit 13. The pressure of the cooling medium in the cryogenic cooling circuit 3 is typically about 1.5 bar at this stage. The cryogenic cooling circuit 3 is also provided with a bypass valve 17 and a bypass duct 18. The bypass duct (18) is arranged in parallel with the second supply air cooler (10). The bypass valve 17 can be used to bypass the second supply cooler 10 by flowing through the bypass duct 18 if a higher supply air temperature is required.

In order to prevent excessive heating of the cooling medium in the high temperature cooling circuit 2, the cooling system includes a heat exchanger 4 for transferring heat from the cooling medium of the high temperature cooling circuit 2 to the cooling medium of the low temperature cooling circuit 3, Is provided. The cooling medium of both the hot and cold cooling circuits 2 and 3 can be arranged to flow through the heat exchanger 4. [ Thus, the heat exchanger 4 is a liquid-liquid heat exchanger. In the embodiment of the figures, the heat exchanger 4 is arranged in a cryogenic cooling circuit 3, and the cooling medium of the hot-cryogenic circuit 2 can be selectively guided through the heat exchanger 4. The heat exchanger 4 is located on the downstream side from the lubricant cooler 14 and on the upstream side cryogenic cooling circuit 3 from the low temperature heat exchanger 15. The high temperature cooling circuit (2) comprises means (5, 6) for selectively guiding the cooling medium through the heat exchanger (4). The means (5, 6) include a selector valve (5) and a cooling duct (6) for guiding the cooling medium through the heat exchanger (4). The cooling duct (6) is connected to the selector valve (5) and also to a point on the downstream side high temperature cooling circuit (2) from this selector valve (5). Due to the selector valve 5, the heat exchanger 4 can be bypassed here, if there is no risk of excessive heating of the cooling medium of the hot cooling circuit 2. The selector valve 5 may be a thermostatically controlled valve which is adapted to cool the cooling medium to the heat exchanger 4 when the temperature of the cooling medium in the high temperature cooling circuit 2 exceeds a predetermined limit, .

By means of the cooling system according to the invention, the temperature of the cooling medium in the high temperature cooling circuit 2 can be maintained within desired limits. This system is particularly advantageous if the conventional engine 1 is upgraded to more efficient superchargers 7. Only small changes are needed to upgrade a conventional cooling system. The flow rates and duct sizes in the cooling circuits 2, 3, 13 should not be changed.

It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, but may be modified in view of the appended claims. For example, the heat exchanger may be arranged in a high temperature refrigeration circuit, and the cooling medium of the low temperature refrigeration circuit may be selectively arranged to flow through the heat exchanger. The cooling circuits can also be arranged to cool objects other than those shown in the embodiments. Objects to be cooled can also be arranged in a different order.

Claims (7)

A cooling system for an internal combustion engine (1)
The cooling system includes a high temperature cooling circuit (2) and a low temperature cooling circuit (3)
Characterized in that the cooling system is provided with a heat exchanger (4) for transferring heat from the high temperature cooling circuit (2) to the low temperature cooling circuit (3). The method according to claim 1,
Characterized in that the cooling medium of the high temperature cooling circuit (2) and the cooling medium of the low temperature cooling circuit (3) can be arranged to flow through the heat exchanger (4). The method according to claim 1,
The heat exchanger 4 is arranged in the low temperature cooling circuit 3 and the high temperature cooling circuit 2 is provided with means 5 and 6 for selectively guiding the cooling medium through the heat exchanger 4 And the cooling system. The method of claim 3,
Characterized in that the high temperature cooling circuit (2) is provided with a selector valve (5) which can be used to selectively guide the cooling medium to the heat exchanger (4) or to bypass the heat exchanger (4) Cooling system. 5. The method of claim 4,
Characterized in that the selector valve (5) is arranged downstream from the supply air cooler (7) and the cooling medium of the hot-air cooling circuit (2) flows through the supply air cooler. 6. The method according to any one of claims 3 to 5,
Characterized in that the heat exchanger (4) is arranged downstream from the lubricant cooler (14) in the cryogenic cooling circuit (3). As a method for reducing the temperature of the cooling medium in the high temperature cooling circuit (2) of the internal combustion engine (1)
The cooling medium of the high temperature cooling circuit 2 is guided through a heat exchanger 4 and heat in the heat exchanger 4 flows from the cooling medium of the high temperature cooling circuit 2 to the cooling medium of the low temperature cooling circuit 3 . ≪ / RTI >
KR1020157018189A 2012-12-10 2012-12-10 Cooling system and method for an internal combustion engine KR101946683B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FI2012/051222 WO2014091056A1 (en) 2012-12-10 2012-12-10 Cooling system and method for an internal combustion engine

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Publication Number Publication Date
KR20150092302A true KR20150092302A (en) 2015-08-12
KR101946683B1 KR101946683B1 (en) 2019-04-22

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EP (1) EP2929159B1 (en)
KR (1) KR101946683B1 (en)
CN (1) CN104797793A (en)
WO (1) WO2014091056A1 (en)

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DE102015111407A1 (en) * 2015-07-14 2017-01-19 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Cooling system for a vehicle
US10150552B2 (en) 2016-02-15 2018-12-11 Southern Towing Company, LLC Forced flow water circulation cooling for barges
CN106150658A (en) * 2016-08-29 2016-11-23 中车大连机车车辆有限公司 Cooling control method in diesel engine of diesel locomotive cooling water system separate type
CN107044332B (en) * 2016-12-26 2019-09-27 潍柴动力股份有限公司 A kind of cooling system and method for engine

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JP2006177265A (en) * 2004-12-22 2006-07-06 Denso Corp Thermoelectric power generation device
US7264520B1 (en) * 2006-10-24 2007-09-04 Brunswick Corporation Cooling system for an outboard motor having both open and closed loop portions
US20090126657A1 (en) * 2007-11-15 2009-05-21 Mokire Mahesh K Engine Cooling System Having Two Cooling Circuits

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KR101013871B1 (en) * 2008-11-21 2011-02-14 한라공조주식회사 Integrated heat exchanger having multi divided section for hybrid vehicle
AT507096B1 (en) * 2008-12-10 2010-02-15 Man Nutzfahrzeuge Oesterreich DRIVE UNIT WITH COOLING CIRCUIT AND SEPARATE HEAT RECOVERY CIRCUIT
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DE102011116423A1 (en) * 2011-10-19 2012-05-03 Daimler Ag Device for indirect thermal coupling of two cooling circuits in internal combustion engine of vehicle, has heat exchangers thermally coupled with refrigerant cycle, and expansion valves parallelly interconnected with each other
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Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006177265A (en) * 2004-12-22 2006-07-06 Denso Corp Thermoelectric power generation device
US7264520B1 (en) * 2006-10-24 2007-09-04 Brunswick Corporation Cooling system for an outboard motor having both open and closed loop portions
US20090126657A1 (en) * 2007-11-15 2009-05-21 Mokire Mahesh K Engine Cooling System Having Two Cooling Circuits

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Publication number Publication date
EP2929159B1 (en) 2018-03-21
WO2014091056A1 (en) 2014-06-19
KR101946683B1 (en) 2019-04-22
EP2929159A1 (en) 2015-10-14
CN104797793A (en) 2015-07-22

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