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WO2013011768A1 - Circuit de refroidissement de moteur - Google Patents

Circuit de refroidissement de moteur Download PDF

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Publication number
WO2013011768A1
WO2013011768A1 PCT/JP2012/064746 JP2012064746W WO2013011768A1 WO 2013011768 A1 WO2013011768 A1 WO 2013011768A1 JP 2012064746 W JP2012064746 W JP 2012064746W WO 2013011768 A1 WO2013011768 A1 WO 2013011768A1
Authority
WO
WIPO (PCT)
Prior art keywords
egr
cooling water
engine
water
egr cooler
Prior art date
Application number
PCT/JP2012/064746
Other languages
English (en)
Japanese (ja)
Inventor
飯島　章
Original Assignee
いすゞ自動車株式会社
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 いすゞ自動車株式会社 filed Critical いすゞ自動車株式会社
Publication of WO2013011768A1 publication Critical patent/WO2013011768A1/fr

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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 with each other by a first engine cooling water return pipe 35, and the cooling water outlet of the thermostat 34 and the radiator 36 are connected.
  • 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.
  • the operating situation where the maximum water flow rate is required for the engine (cylinder block, cylinder head) and the operating situation where the maximum water flow rate is required for the EGR cooler are different. Therefore, particularly in the case of the cooling circuit shown in FIG. 6, even in an operating situation where the maximum water flow rate is not required by the EGR cooler, it is necessary to flow the cooling water to the EGR cooler, which may deteriorate the fuel consumption.
  • an object of the present invention is to provide an engine cooling circuit capable of suppressing deterioration of fuel consumption by reducing an extra driving force of a water pump.
  • 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 water channel an EGR cooler that is disposed in the EGR cooling water channel and cools exhaust gas that is recirculated from the exhaust system of the engine to the intake system, and an EGR cooler side shut-off valve that is disposed in the EGR cooling water channel;
  • Control means for controlling the EGR cooler side shut-off valve the control means exhausting from the exhaust system of the engine to the intake system
  • the EGR cooler side shut-off valve is opened in order to allow cooling water to flow to the EGR cooler, and outside the EGR region, water flow to the EGR cooler is shut off. Therefore, the EGR cooler side shut-off valve is closed.
  • EGR cooler outlet water temperature detection means for detecting an EGR cooler outlet water temperature is provided in the EGR cooling water channel, and the control means detects the EGR detected by the EGR cooler outlet water temperature detection means even outside the EGR region.
  • the EGR cooler side shutoff valve may be opened.
  • the control means may determine that the EGR valve disposed in the EGR passage of the engine is in the EGR region when the EGR valve is open, and determine that the EGR valve is out of the EGR region when the EGR valve is closed. good.
  • 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.
  • an engine cooling circuit capable of suppressing deterioration of fuel consumption by reducing the extra driving force of the water pump.
  • 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 restricting the flow rate of water 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).
  • the first engine cooling water return pipe 6a (that is, the engine cooling water return water path 6 upstream of the thermostat 7) is provided with an engine outlet for detecting the engine outlet water temperature.
  • a water temperature sensor (engine outlet water temperature detecting means) 15 is provided.
  • the first shutoff valve 14 is controlled to be opened and closed by an ECU (Electronic Control Unit) 16 as control means.
  • the EUC 16 closes the first shut-off valve 14 so as to block the water flow to the engine 2 while allowing the cooling water to flow only to the EGR cooler 12, while the engine 2 is warming up.
  • the first shut-off 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 S11 the ECU 16 determines whether or not the engine 2 is warming up.
  • step S11 the ECU 16 closes the first cutoff valve 14 in step S12, and returns this control.
  • step S11 the ECU 16 opens the first shutoff valve 14 in step S13, and returns this control.
  • an EGR cooler-side shutoff valve (hereinafter referred to as an EGR cooler-side shutoff valve (hereinafter referred to as an EGR cooling water channel 11 upstream of the restrictor 13 and the EGR cooler 12) upstream of the restrictor 13).
  • EGR cooler outlet for detecting the EGR cooler outlet water temperature is provided in the second EGR cooling water pipe 11b (that is, the EGR cooling water passage 11 on the downstream side of the EGR cooler 12).
  • a water temperature sensor (EGR cooler outlet water temperature detecting means) 18 is disposed.
  • the second shutoff valve 17 is controlled to be opened and closed by the ECU 16.
  • the EUC 16 is a second shut-off valve for flowing cooling water to the EGR cooler 12.
  • the second shutoff valve 17 is closed to shut off the water flow to the EGR cooler 12.
  • the ECU 16 determines that the EGR valve disposed in series with the EGR cooler 12 in an EGR passage (not shown) is in the EGR region, while the EGR region is closed when the EGR valve is closed. It has come to be judged outside. This is because it can be determined that EGR is being performed when the EGR valve is open, while it can be determined that EGR is not being performed when the EGR valve is closed.
  • the ECU 16 opens the second shut-off valve 17 when the EGR cooler outlet water temperature detected by the EGR cooler outlet water temperature sensor 18 is equal to or higher than a predetermined temperature (for example, 95 ° C.) even outside the EGR region. It has become.
  • a predetermined temperature for example, 95 ° C.
  • the reason for opening the second shut-off valve 17 under such conditions is to prevent boiling of the cooling water in the EGR cooler 12.
  • the predetermined temperature is set lower than the temperature (boiling point) at which the cooling water boils.
  • step S21 the ECU 16 determines whether or not it is outside the EGR region. If it is determined in step S21 that it is outside the EGR region (YES), the ECU 16 closes the second shutoff valve 17 in step S22, and proceeds to step S24. On the other hand, if it is determined in step S21 that it is not outside the EGR region (NO; within the EGR region), the ECU 16 opens the second shutoff valve 17 in step S23, and returns this control.
  • step S24 the ECU 16 determines whether or not the EGR cooler outlet water temperature detected by the EGR cooler outlet water temperature sensor 18 is equal to or higher than a predetermined temperature. If it is determined in step S24 that the EGR cooler outlet water temperature is equal to or higher than the predetermined temperature (YES), the ECU 16 opens the second shutoff valve 17 in step S25, and returns this control. On the other hand, when it is determined in step S24 that the EGR cooler outlet water temperature is lower than the predetermined temperature (NO), the ECU 16 maintains the state where the second shutoff valve 17 is closed, and returns to this control.
  • the ECU 16 opens the second shutoff valve 17 so that the cooling water flows through the EGR cooler 12. At this time, the water flow rate to the EGR cooler 12 is limited by the throttle unit 13. This is because the water flow rate required by the EGR cooler 12 is smaller than the water flow rate required by the engine 2.
  • the ECU 16 closes the second shutoff valve 17 and shuts off water flow to the EGR cooler 12.
  • the aforementioned EGR valve is closed and the supply of exhaust gas to the EGR cooler 12 is stopped. Therefore, even if the water flow to the EGR cooler 12 is temporarily blocked, there is no effect. Even if the second shutoff valve 17 is closed, the water flow rate to the engine 2 (cylinder block 3, cylinder head 4) does not change.
  • the circuit (EGR cooling water channel 11) of the EGR cooler 12 is closed outside the EGR region, the discharge flow rate of the water pump 9 decreases, and as a result, the driving force of the water pump 9 decreases. Therefore, fuel consumption is 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 second shutoff valve 17 may be disposed in the second EGR cooling water pipe 11 b (that is, the EGR cooling water passage 11 on the downstream side of the EGR cooler 12). Even in this case, it is possible to shut off the water flow to the EGR cooler 12 by closing the second shutoff valve 17.
  • 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

La présente invention permet de réduire au minimum les diminutions du rendement énergétique en réduisant la quantité d'énergie gaspillée par une pompe à eau. Un circuit de refroidissement (1) comprend les éléments suivants : un canal d'eau de refroidissement d'EGR (11) raccordé à un canal d'alimentation en eau de refroidissement de moteur (8) en un point situé en aval de la pompe à eau (9) ; un refroidisseur d'EGR (12) qui est disposé sur ledit canal d'eau de refroidissement d'EGR (11) et qui refroidit un gaz d'échappement recirculé du système d'échappement du moteur (2) vers le système d'admission de celui-ci ; une soupape d'arrêt du côté du refroidisseur d'EGR (17) disposée dans le canal d'eau de refroidissement d'EGR (11) ; et un moyen de commande (16) qui commande ladite soupape d'arrêt du côté du refroidisseur d'EGR (17). Dans une région d'EGR dans laquelle le gaz d'échappement est recirculé du système d'échappement du moteur (2) vers le système d'admission de celui-ci, le moyen de commande (16) ouvre la soupape d'arrêt du côté du refroidisseur d'EGR (17) de manière à permettre l'écoulement de l'eau de refroidissement vers le refroidisseur d'EGR (12), et à l'extérieur de la région d'EGR, le moyen de commande ferme la soupape d'arrêt du côté du refroidisseur d'EGR (17) de manière à couper l'écoulement d'eau vers le refroidisseur d'EGR (12).
PCT/JP2012/064746 2011-07-19 2012-06-08 Circuit de refroidissement de moteur WO2013011768A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011157899A JP2013024083A (ja) 2011-07-19 2011-07-19 エンジンの冷却回路
JP2011-157899 2011-07-19

Publications (1)

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WO2013011768A1 true WO2013011768A1 (fr) 2013-01-24

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WO (1) WO2013011768A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2991715A1 (fr) * 2012-06-12 2013-12-13 Peugeot Citroen Automobiles Sa Moteur a combustion et circuit de refroidissement optimise

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6186866B2 (ja) * 2013-05-09 2017-08-30 いすゞ自動車株式会社 エンジンの冷却システム
JP6186867B2 (ja) * 2013-05-09 2017-08-30 いすゞ自動車株式会社 エンジンの冷却システム
CN109268120A (zh) * 2018-08-22 2019-01-25 浙江吉利控股集团有限公司 一种发动机的冷却系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005351194A (ja) * 2004-06-11 2005-12-22 Hino Motors Ltd Ｅｇｒ装置
JP2007040141A (ja) * 2005-08-02 2007-02-15 Toyota Motor Corp Ｅｇｒクーラシステム
JP2007263034A (ja) * 2006-03-29 2007-10-11 Isuzu Motors Ltd エンジンの冷却水回路
JP2010159654A (ja) * 2009-01-06 2010-07-22 Toyota Motor Corp 内燃機関の制御装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005351194A (ja) * 2004-06-11 2005-12-22 Hino Motors Ltd Ｅｇｒ装置
JP2007040141A (ja) * 2005-08-02 2007-02-15 Toyota Motor Corp Ｅｇｒクーラシステム
JP2007263034A (ja) * 2006-03-29 2007-10-11 Isuzu Motors Ltd エンジンの冷却水回路
JP2010159654A (ja) * 2009-01-06 2010-07-22 Toyota Motor Corp 内燃機関の制御装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2991715A1 (fr) * 2012-06-12 2013-12-13 Peugeot Citroen Automobiles Sa Moteur a combustion et circuit de refroidissement optimise

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Publication number Publication date
JP2013024083A (ja) 2013-02-04

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