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WO2013011767A1 - Circuit de refroidissement de moteur - Google Patents

Circuit de refroidissement de moteur Download PDF

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Publication number
WO2013011767A1
WO2013011767A1 PCT/JP2012/064745 JP2012064745W WO2013011767A1 WO 2013011767 A1 WO2013011767 A1 WO 2013011767A1 JP 2012064745 W JP2012064745 W JP 2012064745W WO 2013011767 A1 WO2013011767 A1 WO 2013011767A1
Authority
WO
WIPO (PCT)
Prior art keywords
engine
cooling water
water
egr
cooling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2012/064745
Other languages
English (en)
Japanese (ja)
Inventor
飯島　章
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Isuzu Motors Ltd
Original Assignee
Isuzu Motors Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Isuzu Motors Ltd filed Critical Isuzu Motors Ltd
Publication of WO2013011767A1 publication Critical patent/WO2013011767A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • F01P3/02—Arrangements for cooling cylinders or cylinder heads
    • 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
    • F01P3/00—Liquid cooling
    • F01P3/02—Arrangements for cooling cylinders or cylinder heads
    • F01P2003/028—Cooling cylinders and cylinder heads in series
    • 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
    • F01P2037/00—Controlling
    • F01P2037/02—Controlling starting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F02M26/28—Layout, e.g. schematics with liquid-cooled heat exchangers

Definitions

  • the present invention relates to a cooling circuit for a water-cooled engine.
  • the cooling water outlet of the engine 31 (cylinder head 33) and the cooling water inlet of the thermostat 34 are communicated by a first engine cooling water return pipe 35, and the cooling water outlet of the thermostat 34 and the radiator 36 are communicated.
  • the second engine coolant return pipe 37 communicates with the coolant inlet.
  • a cooling water outlet of the radiator 36 and a suction port of the water pump 38 are communicated with each other by a first engine cooling water supply pipe 39, and a discharge port of the water pump 38 and a cooling water inlet of the engine 31 (cylinder block 32) are connected to the second engine.
  • the cooling water supply pipe 40 communicates.
  • the first engine cooling water return pipe 35 and the cooling water inlet of the EGR cooler 41 are communicated with each other by a first EGR cooling water pipe 42, and the cooling water outlet of the EGR cooler 41 and the first engine cooling water supply pipe 39 are connected to the second.
  • the EGR cooling water pipe 43 communicates.
  • the thermostat 34 and the water pump 38 are communicated with each other by a bypass pipe 44.
  • the thermostat 34 When the cooling water temperature in the first engine cooling water return pipe 35 is lower than a predetermined temperature, the thermostat 34 is automatically closed and the cooling water is cooled. Is not supplied to the radiator 36 but is supplied to the water pump 38 via the bypass pipe 44.
  • Patent Document 1 This type of engine cooling circuit is disclosed in Patent Document 1, for example.
  • an object of the present invention is to provide an engine cooling circuit that does not cause boiling of the cooling water in the EGR cooler even when water flow to the engine is stopped.
  • the present invention provides an engine cooling water outlet and a radiator cooling water inlet connected by an engine cooling water return water channel, and the radiator cooling water outlet and the engine cooling water inlet.
  • a cooling circuit in which a water pump is disposed in the engine cooling water supply water channel, and an EGR connected to the engine cooling water supply water channel on the downstream side of the water pump.
  • a shut-off valve provided in the supply water channel, and a control means for controlling the shut-off valve, wherein the control means warms the engine.
  • the shut-off valve While shutting off water flow to the engine, the shut-off valve is closed to allow cooling water to flow to the EGR cooler, and during normal operation except during warm-up, the cooling water is supplied to the engine and the EGR.
  • the shut-off valve is opened in order to flow to the cooler.
  • an engine outlet water temperature detecting means for detecting an engine outlet water temperature
  • the control means when the engine outlet water temperature detected by the engine outlet water temperature detecting means is less than a predetermined temperature, When the engine outlet water temperature detected by the engine outlet water temperature detecting means is equal to or higher than the predetermined temperature, it is determined that the engine is in normal operation.
  • the EGR cooling water channel may be provided with a throttle portion that restricts the flow rate of water to the EGR cooler.
  • the return part of the EGR cooling water channel may be connected to the engine cooling water return water channel.
  • the engine 2 has a cylinder block 3 and a cylinder head 4.
  • the cooling water outlet of the engine 2 (cylinder head 4) and the cooling water inlet of the radiator 5 are connected by an engine cooling water return channel 6, and a thermostat 7 is disposed in the engine cooling water return channel 6.
  • the engine cooling water return water channel 6 includes a first engine cooling water return pipe 6 a that communicates the cooling water outlet of the engine 2 and the cooling water inlet of the thermostat 7, and the cooling water outlet of the thermostat 7 and the cooling water inlet of the radiator 5.
  • the second engine cooling water return pipe 6b communicates with the second engine cooling water return pipe 6b.
  • a cooling water outlet of the radiator 5 and a cooling water inlet of the engine 2 (cylinder block 3) are connected by an engine cooling water supply water channel 8, and a water pump 9 is disposed in the engine cooling water supply water channel 8.
  • the engine cooling water supply channel 8 includes a first engine cooling water supply pipe 8 a that communicates the cooling water outlet of the radiator 5 and the suction port of the water pump 9, the discharge port of the water pump 9, and the cooling water inlet of the engine 2.
  • the second engine cooling water supply pipe 8b communicates.
  • the water pump 9 is a mechanical type that is connected to the crankshaft or the like of the engine 2 and is driven by the rotation of the crankshaft or the like.
  • thermostat 7 and the water pump 9 are connected by a bypass pipe (bypass water passage) 10, and the cooling water temperature in the first engine cooling water return pipe 6a is lower than a predetermined temperature (for example, 86 ° C.), The thermostat 7 is automatically closed so that the cooling water does not flow to the radiator 5 but flows to the water pump 9 via the bypass pipe 10.
  • a predetermined temperature for example, 86 ° C.
  • An EGR cooling water passage 11 is connected to the second engine cooling water supply pipe 8b (that is, the engine cooling water supply water passage 8 on the downstream side of the water pump 9), and the EGR cooling water passage 11 is connected to the exhaust system of the engine 2 from the exhaust system.
  • An EGR cooler 12 that cools the exhaust gas recirculated to the intake system is provided.
  • the return portion of the EGR cooling water channel 11 is connected to the second engine cooling water return pipe 6b (that is, the engine cooling water return water channel 6 on the downstream side of the thermostat 7).
  • the EGR cooling water channel 11 includes a first EGR cooling water pipe 11a that connects the second engine cooling water supply pipe 8b and the cooling water inlet of the EGR cooler 12, a cooling water outlet of the EGR cooler 12, and a second engine cooling water return pipe 6b. It is comprised from the 2nd EGR cooling water pipe
  • the first EGR cooling water pipe 11a (that is, the EGR cooling water channel 11 on the upstream side of the EGR cooler 12) is provided with a throttle portion (throttle) 13 for limiting the water flow rate to the EGR cooler 12.
  • an engine-side shut-off valve (hereinafter referred to as “engine-side cutoff valve”) is connected to the second engine cooling water supply pipe 8b (engine cooling water supply water path 8) on the downstream side of the connection portion of the first EGR cooling water pipe 11a (EGR cooling water path 11).
  • An engine outlet water temperature sensor for detecting the engine outlet water temperature is provided in the first engine cooling water return pipe 6a (that is, the engine cooling water return water channel 6 upstream of the thermostat 7). (Engine outlet water temperature detection means) 15 is provided.
  • the shutoff valve 14 is controlled to be opened and closed by an ECU (Electronic Control Unit) 16 as control means.
  • the EUC 16 While the engine 2 is warming up, the EUC 16 shuts off the water flow to the engine 2 while closing the shut-off valve 14 so that the cooling water flows only to the EGR cooler 12, while excluding the engine 2 during warming up. During normal operation (warm-up completion), the shutoff valve 14 is opened so that the coolant flows through the engine 2 and the EGR cooler 12.
  • the ECU 16 determines that the engine 2 is warming up when the engine outlet water temperature detected by the engine outlet water temperature sensor 15 is lower than a predetermined temperature (for example, 80 ° C.), while the engine outlet water temperature sensor 15 When the engine outlet water temperature detected by the above is equal to or higher than the predetermined temperature, it is determined that the engine 2 is in normal operation.
  • a predetermined temperature for example, 80 ° C.
  • step S1 the ECU 16 determines whether or not the engine 2 is warming up.
  • step S1 the ECU 16 closes the cutoff valve 14 in step S2 and returns this control.
  • step S1 the ECU 16 opens the shutoff valve 14 in step S3, and returns to this control.
  • the shutoff valve 14 is closed by the ECU 16, so that cooling water does not flow into the engine 2 (cylinder block 3, cylinder head 4), and cooling water flows only into the EGR cooler 12. .
  • the water flow rate to the EGR cooler 12 is limited by the throttle unit 13. Since it is not necessary to flow the total water flow rate of the water pump 9 to the EGR cooler 12, the water flow rate to the EGR cooler 12 is limited.
  • the shutoff valve 14 is opened by the ECU 16, and cooling water flows through the engine 2 (cylinder block 3, cylinder head 4) and the EGR cooler 12. At this time, the water flow rate to the EGR cooler 12 is limited by the throttle unit 13. Since the water flow rate required by the EGR cooler 12 is smaller than the water flow rate required by the engine 2, the water flow rate to the EGR cooler 12 is limited.
  • the cooling water in the EGR cooler 12 does not boil and the shut-off time of the shut-off valve 14 can be lengthened. As a result, fuel consumption can be improved.
  • the throttle portion 13 may be disposed in the second EGR cooling water pipe 11b (that is, the EGR cooling water channel 11 on the downstream side of the EGR cooler 12). Even in this way, it is possible to limit the water flow rate to the EGR cooler 12.
  • the present invention can be applied to cooling circuits for various engines such as diesel engines and gasoline engines.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

L'invention concerne un circuit de refroidissement de moteur selon lequel de l'eau de refroidissement dans un refroidisseur d'EGR ne bout pas même si l'écoulement d'eau vers le moteur est coupé. Ledit circuit de refroidissement (1) comprend : un passage d'eau de refroidissement d'EGR (11) qui est raccordé à un passage d'alimentation en eau de refroidissement de moteur (8) en un point situé en aval d'une pompe à eau (9) ; un refroidisseur d'EGR (12) qui est disposé sur le passage d'eau de refroidissement d'EGR (11) et qui refroidit le gaz d'échappement recirculé du système d'échappement du moteur (2) vers le système d'admission de celui-ci ; une soupape d'arrêt (14) qui est disposée dans le passage d'alimentation en eau de refroidissement du moteur (8) en aval du point au niveau duquel le passage d'eau de refroidissement d'EGR (11) est raccordé ; et un moyen de commande (16) qui commande la soupape d'arrêt (14). Lorsque le moteur (2) chauffe, le moyen de commande (16) ferme la soupape d'arrêt (14) de manière à couper l'écoulement d'eau vers le moteur (2) tout en permettant toujours l'écoulement d'eau de refroidissement vers le refroidisseur d'EGR (12), et pendant le fonctionnement normal, qui exclut le chauffage, le moyen de commande (16) ouvre la soupape d'arrêt (14) de manière à permettre l'écoulement d'eau de refroidissement vers le moteur (2) et le refroidisseur d'EGR (12).
PCT/JP2012/064745 2011-07-19 2012-06-08 Circuit de refroidissement de moteur Ceased WO2013011767A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011157898A JP2013024082A (ja) 2011-07-19 2011-07-19 エンジンの冷却回路
JP2011-157898 2011-07-19

Publications (1)

Publication Number Publication Date
WO2013011767A1 true WO2013011767A1 (fr) 2013-01-24

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ID=47557953

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Application Number Title Priority Date Filing Date
PCT/JP2012/064745 Ceased WO2013011767A1 (fr) 2011-07-19 2012-06-08 Circuit de refroidissement de moteur

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JP (1) JP2013024082A (fr)
WO (1) WO2013011767A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018003423A1 (fr) * 2016-06-28 2018-01-04 株式会社豊田自動織機 Dispositif de commande pour moteur
JP2018025179A (ja) * 2016-08-12 2018-02-15 いすゞ自動車株式会社 車両用の冷却システム、及びその制御方法
CN110454268A (zh) * 2019-07-16 2019-11-15 玉柴联合动力股份有限公司 一种发动机和egr冷却器并联冷却系统
JP2021004564A (ja) * 2019-06-25 2021-01-14 日産自動車株式会社 ランキンサイクルシステムの運転方法および廃熱回収装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004076689A (ja) * 2002-08-21 2004-03-11 Denso Corp 内燃機関の冷却系の異常診断装置
JP2005351194A (ja) * 2004-06-11 2005-12-22 Hino Motors Ltd Ｅｇｒ装置
JP2007263034A (ja) * 2006-03-29 2007-10-11 Isuzu Motors Ltd エンジンの冷却水回路
JP2009121319A (ja) * 2007-11-14 2009-06-04 Aisin Seiki Co Ltd エンジン冷却装置及びその運転方法
JP2010159654A (ja) * 2009-01-06 2010-07-22 Toyota Motor Corp 内燃機関の制御装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004076689A (ja) * 2002-08-21 2004-03-11 Denso Corp 内燃機関の冷却系の異常診断装置
JP2005351194A (ja) * 2004-06-11 2005-12-22 Hino Motors Ltd Ｅｇｒ装置
JP2007263034A (ja) * 2006-03-29 2007-10-11 Isuzu Motors Ltd エンジンの冷却水回路
JP2009121319A (ja) * 2007-11-14 2009-06-04 Aisin Seiki Co Ltd エンジン冷却装置及びその運転方法
JP2010159654A (ja) * 2009-01-06 2010-07-22 Toyota Motor Corp 内燃機関の制御装置

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018003423A1 (fr) * 2016-06-28 2018-01-04 株式会社豊田自動織機 Dispositif de commande pour moteur
JP2018003632A (ja) * 2016-06-28 2018-01-11 株式会社豊田自動織機 エンジンの制御装置
JP2018025179A (ja) * 2016-08-12 2018-02-15 いすゞ自動車株式会社 車両用の冷却システム、及びその制御方法
JP2021004564A (ja) * 2019-06-25 2021-01-14 日産自動車株式会社 ランキンサイクルシステムの運転方法および廃熱回収装置
JP7333212B2 (ja) 2019-06-25 2023-08-24 日産自動車株式会社 ランキンサイクルシステムの運転方法および廃熱回収装置
CN110454268A (zh) * 2019-07-16 2019-11-15 玉柴联合动力股份有限公司 一种发动机和egr冷却器并联冷却系统

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