EP2652305A1 - Circuit de refroidissement pour un moteur à combustion interne comportant une recirculation des gaz d'échappement et procédé de fonctionnement d'un moteur à combustion interne équipé d'un tel circuit de refroidissement - Google Patents

Circuit de refroidissement pour un moteur à combustion interne comportant une recirculation des gaz d'échappement et procédé de fonctionnement d'un moteur à combustion interne équipé d'un tel circuit de refroidissement

Info

Publication number
EP2652305A1
EP2652305A1 EP11794043.7A EP11794043A EP2652305A1 EP 2652305 A1 EP2652305 A1 EP 2652305A1 EP 11794043 A EP11794043 A EP 11794043A EP 2652305 A1 EP2652305 A1 EP 2652305A1
Authority
EP
European Patent Office
Prior art keywords
coolant
internal combustion
combustion engine
outlet
egr
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.)
Granted
Application number
EP11794043.7A
Other languages
German (de)
English (en)
Other versions
EP2652305B1 (fr
Inventor
Ekkehard Pott
Dirk Browatzki
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.)
Volkswagen AG
Original Assignee
Volkswagen AG
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 Volkswagen AG filed Critical Volkswagen AG
Publication of EP2652305A1 publication Critical patent/EP2652305A1/fr
Application granted granted Critical
Publication of EP2652305B1 publication Critical patent/EP2652305B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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
    • F01P2060/16—Outlet manifold
    • 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
    • F01P3/12—Arrangements for cooling other engine or machine parts

Definitions

  • the invention relates to a cooling circuit for an internal combustion engine with an exhaust gas recirculation (EGR), in particular for a diesel internal combustion engine.
  • the internal combustion engine has a coolant inlet and a coolant outlet.
  • the refrigeration cycle further comprises a main radiator having a radiator inlet and a radiator outlet, an EGR radiator having an EGR inlet for coolant and an EGR outlet for coolant, and a main control device, in particular a main thermostat, which is arranged in front of the internal combustion engine in the flow direction of the coolant.
  • the invention relates to a method for operating an internal combustion engine with such a cooling circuit.
  • Exhaust gas recirculation is used to recirculate exhaust gas from an exhaust side of
  • Exhaust gas recirculation line an EGR cooler provided.
  • Exhaust gas recirculation cooler which is connected to a working with a liquid coolant cooling circuit.
  • the exhaust gas recirculation cooler has a through-flow of coolant
  • Radiator housing the at least one exhaust inlet, an exhaust outlet, a
  • the exhaust gas recirculation cooler contains in its cooler housing a first and a second cooling tube arrangement, wherein the second cooling tube arrangement allows a larger heat flow between exhaust gas and coolant than the first one. It is also known from the publication DE 103 58 311 A1 that the flow of an EGR cooler valve and thermostat controlled can be done. The valve is used for
  • a flow through the EGR cooler with coolant from the radiator outlet of the main radiator in particular after a cold start of the internal combustion engine and / or at low ambient temperatures, can result in lowering the coolant temperature in the EGR cooler to below 50 degrees Celsius or even to ambient temperature with the initially described risk of coking and corrosion.
  • the invention has the object, a cooling circuit of an internal combustion engine of the type mentioned in such a way and operate, that on the one hand, the EGR cooler can provide the required performance and on the other hand maximum reliability against coking and corrosion, against local education
  • a cooling circuit for an internal combustion engine according to the features of claim 1.
  • the dependent claims relate to particularly expedient developments of the invention.
  • a cooling circuit is provided which comprises a secondary control device, which is arranged downstream of the exhaust gas recirculation cooler in the flow direction of the coolant, and / or an exhaust gas recirculation control device, which is arranged upstream of the exhaust gas recirculation cooler in the flow direction of the coolant.
  • the coolant inlet is connected to a main coolant pump, which is arranged in particular between the main control device and the internal combustion engine.
  • the main control device is preferably designed as a thermostat.
  • the exhaust gas recirculation control device is designed to connect the EGR inlet to the radiator outlet or the coolant outlet. This makes it possible to constantly flow through the EGR cooler with coolant.
  • the exhaust gas recirculation control device can have the functions of a thermostat, a mixing device and / or a valve, in particular a 2/2 way valve or a 3/2-way valve.
  • the secondary control device is designed to connect the EGR outlet to the radiator inlet and / or the coolant inlet or to connect the EGR outlet and the coolant outlet to the radiator inlet.
  • different coolant paths can be switched in the cooling circuit arrangement for different operating states.
  • Coolant depending on the coolant temperature to the respective units such as
  • Coolant inlet of the internal combustion engine and the EGR inlet is connected and the EGR.
  • Outlet and the coolant outlet of the internal combustion engine are connected to the radiator inlet. This makes it possible, at a high ambient temperature, in particular at over 40 degrees Celsius, and / or at a high coolant temperature, in particular in
  • Ambient temperatures ensured that the required performance of the EGR cooler and the internal combustion engine can be provided.
  • cooling circuit in a start operating state, in particular after a cold start of the internal combustion engine, the coolant outlet of the
  • a further favorable design of the cooling circuit is that in a mixed operating state, the exhaust gas recirculation control device is set up, in particular as a function of the coolant temperature, such that the EGR inlet of the EGR cooler is connected to the coolant outlet of the internal combustion engine and / or to the radiator outlet of the main radiator.
  • Coolant temperature can be adjusted.
  • the exhaust gas recirculation control device is designed such that between a coolant flow from the coolant outlet of the
  • a method in which the EGR cooler functions as a function of a threshold temperature with coolant from the internal combustion engine and / or with coolant
  • the main radiator is flowed through, wherein the threshold temperature is set as a function of the ambient temperature and the coolant temperature.
  • the cooling circuit In a cold start of the internal combustion engine, the cooling circuit is operated in a start operating state, which allows a rapid heating of the units and the coolant to the respective operating temperature. As a rule, the coolant first reaches the optimum temperature for the operation of the EGR cooler.
  • an exhaust gas recirculation control device is provided at the EGR inlet, by means of which the EGR cooler can be switched and / or controllably supplied with optionally coolant-tempered coolant from the main cooler and / or warmer tempered coolant from the coolant outlet of the internal combustion engine.
  • the exhaust gas recirculation control device is preferably designed to be switchable as a 2/3-way valve or as two 2/2-way valves.
  • the coolant return from the EGR cooler is supplied to either the engine or the main radiator.
  • the secondary control device is provided.
  • the secondary control device and the main control device are designed passive thermostatic and / or active switchable.
  • Exhaust gas recirculation control device preferably takes place as a function of the
  • Coolant temperature such that at the same time an efficient EGR cooling as well as a minimum sooting can be achieved.
  • the threshold temperature of the exhaust gas recirculation control device is lowered.
  • the usual threshold temperature of the main regulator is about 90 degrees Celsius at a coolant temperature. If the threshold temperature is exceeded, the
  • the threshold temperature of the exhaust gas recirculation control device can also on the
  • Main control device are applied.
  • the main control device for example, at an ambient temperature above 40 degrees Celsius, lowered to a threshold temperature for the coolant of 50 degrees Celsius. If the coolant outlet is connected to the EGR inlet, overheating of the coolant in the EGR cooler can be avoided.
  • the cooling circuit After reaching the operating temperature in the internal combustion engine and / or at a high ambient temperature, the cooling circuit is operated in a load operating state. In this case, both the internal combustion engine and the EGR cooler are flowed through with coolant from the main cooler.
  • the coolant outlet of the internal combustion engine is connected to the EGR inlet of the EGR cooler and via a radiator bypass and a main control device with a coolant inlet of the internal combustion engine.
  • the cooling circuit is switched in particular before reaching the mixed operating state.
  • FIG. 1 shows a schematic representation of a cooling circuit of an internal combustion engine in a start operating state
  • Fig. 2 is a schematic representation of the cooling circuit of the internal combustion engine in a
  • Fig. 3 is a schematic representation of the cooling circuit of the internal combustion engine in a
  • FIGS 1, 2 and 3 show a cooling circuit 1 of an internal combustion engine 2 with a
  • the internal combustion engine 2 has a coolant inlet 3 and a
  • Coolant outlet 4 In the cooling circuit 1, a main radiator 5 is further provided, which has a radiator inlet 6 and a radiator outlet 7.
  • Internal combustion engine 2 includes an EGR cooler 8 having an EGR inlet 9 for coolant and an EGR outlet 10 for coolant. Furthermore, in the cooling circuit 1 a
  • Main control device 11 Main control device 11
  • secondary control device 12 Main control device 12
  • Exhaust gas recirculation control device 3 is provided.
  • the main control device 11 is preferably designed as a thermostat.
  • the main controller 11 is in
  • the Secondary control device 12 is arranged in the flow direction of the coolant after the EGR cooler 8.
  • the exhaust gas recirculation control device 13 is arranged upstream of the EGR cooler 8 in the flow direction of the coolant.
  • the coolant inlet 3 with a
  • Main coolant pump 14 connected.
  • the main coolant pump 14 is arranged between the main control device 11 and the internal combustion engine 2.
  • Exhaust gas recirculation control device 13 is, as shown in Figures 2 and 3, preferably designed as a 3/2-way valve.
  • FIG. 1 shows the cooling circuit 1 in a start operating state.
  • the refrigeration cycle 1 is set at a cold start of the internal combustion engine 2. It is the
  • Exhaust gas recirculation control device 13 is set such that the coolant outlet 4 of the
  • Internal combustion engine 2 is connected to the EGR inlet 9 of the EGR cooler 8. This ensures that the EGR cooler 8 is heated quickly by means of the waste heat of the internal combustion engine 2 to its operating temperature.
  • the coolant outlet 4 of the internal combustion engine 2 is further connected to the main regulator 11 via the main cooler bypass 16.
  • the auxiliary control device 12 is set in the start operating state such that the EGR outlet 10 of the EGR cooler 8 with the main cooler bypass 16 and thus with the
  • Coolant line 15 and the coolant line 18 are flowed through by coolant.
  • the coolant line 17, the main cooler 5, the radiator inlet 6, the radiator outlet 7 and the coolant line 19 between the radiator outlet 7 and the exhaust gas recirculation control device 13 are not flowed through by coolant.
  • Exhaust gas recirculation control device 3 is shown here in a variant embodiment as a 3/2-way valve.
  • FIG. 2 shows the cooling circuit 1 in an isch thoroughlysSullivan. After a cold start the
  • the operating temperature of the internal combustion engine 2 is generally reached when the coolant in the coolant outlet 4 of the internal combustion engine 2 has reached a temperature of approximately 90 degrees Celsius.
  • the exhaust gas recirculation control device 13 is set such that the radiator outlet 7 of the main radiator 5 is connected to the EGR inlet 9 of the EGR cooler 8.
  • the sub-controller 12 is set in the mixed operation state such that the EGR outlet 10 of the EGR cooler 8 is connected to the radiator inlet 6 of the main radiator 5.
  • the coolant outlet 4 of the internal combustion engine 2 is connected to the main regulator 11 via the main cooler bypass 16.
  • the radiator bypass 16 and the secondary control device 12 can be flowed through in the mixed operating state only by a subset of the circulated by the internal combustion engine 2 main coolant pump 14 coolant flow rate.
  • the flow through the coolant line 17 and the coolant line 18 is optionally possible and essentially dependent on the switching state of the main control device 11 and the secondary control device 12.
  • the flow direction in the coolant line 18 is also dependent on the switching state of the main controller 11 and / or the secondary controller 12.
  • Die Exhaust gas recirculation control device 13 is shown in this figure in a variant embodiment as a mixing device.
  • FIG. 3 shows the cooling circuit 1 in a load operating state.
  • the cooling circuit 1 is in the
  • Threshold is. This threshold is chosen below the boiling point of the coolant, preferably greater than or equal to 70 degrees Celsius. Thus, the evaporation of the coolant and the concomitant increase in the volume of coolant can be prevented.
  • the load operating state is set when the ambient temperature is greater than a threshold, in particular greater than 40 degrees Celsius and at the same time exceeds the coolant temperature 50 degrees Celsius.
  • the exhaust gas recirculation control device 13 is set such that the radiator outlet 7 of the main radiator 5 is connected to the EGR inlet 9 of the EGR cooler 8.
  • the coolant inlet 3 of the internal combustion engine 2 is connected to the radiator outlet 7 of the main radiator 5.
  • the secondary control device 12 is set in the load operating state such that the
  • Coolant outlet 4 of the internal combustion engine 2 and the EGR outlet 10 of the EGR cooler 8 is connected to the radiator inlet 6 of the main radiator 5.
  • the coolant line 15 between the coolant outlet 4 of the internal combustion engine 2 and the exhaust gas recirculation control device 13 and a main cooler bypass 16 between the coolant outlet 4 of the internal combustion engine 2 and the main control device 11 are not flowed through by coolant in the load operating state.

Landscapes

  • 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 porte sur un circuit de refroidissement (1) pour un moteur à combustion interne (2) possédant une recirculation des gaz d'échappement. Le moteur à combustion interne (2) comporte une entrée de fluide de refroidissement (3) et une sortie de fluide de refroidissement (4). Le circuit de refroidissement (1) comprend en outre un refroidisseur principal (5) ayant une entrée de refroidisseur (6) et une sortie de refroidisseur (7), un refroidisseur de AGR (8) possédant une entrée de AGR (recirculation des gaz d'échappement)(9) pour le fluide de refroidissement et une sortie de AGR (10) pour le fluide de refroidissement ainsi qu'un dispositif de régulation principal (11) qui est disposé en amont du moteur à combustion interne (2) dans le sens de l'écoulement du fluide de refroidissement. De cette façon, d'une part, le refroidisseur de AGR (8) peut développer la puissance nécessaire et, d'autre part, on obtient une sécurité de fonctionnement maximale du circuit de refroidissement (1) et des accessoires intercalés dans le circuit de refroidissement (1), selon l'invention, le circuit de refroidissement (1) comprend un dispositif de régulation secondaire (12) qui est disposé en aval du refroidisseur de recirculation des gaz d'échappement (8), dans le sens de l'écoulement du fluide de refroidissement et/ou un dispositif de régulation de la recirculation des gaz d'échappement (13) qui est disposé en amont du refroidisseur de recirculation des gaz d'échappement (8), dans le sens de l'écoulement du fluide de refroidissement. En outre, l'invention porte sur un procédé de fonctionnement d'un moteur à combustion interne (2) équipé d'un tel circuit de refroidissement (1).
EP11794043.7A 2010-12-18 2011-12-05 Circuit de refroidissement d'un moteur avec recirculation des gaz d'échappement et procédé pour faire fonctionner un moteur à combustion interne avec un tel circuit de refroidissement Active EP2652305B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010055072A DE102010055072A1 (de) 2010-12-18 2010-12-18 Kühlkreis für eine Brennkraftmaschine mit einer Abgasrückführung und Verfahren zum Betrieb einer Brennkraftmaschine mit einem solchen Kühlkreis
PCT/EP2011/006084 WO2012079715A1 (fr) 2010-12-18 2011-12-05 Circuit de refroidissement pour un moteur à combustion interne comportant une recirculation des gaz d'échappement et procédé de fonctionnement d'un moteur à combustion interne équipé d'un tel circuit de refroidissement

Publications (2)

Publication Number Publication Date
EP2652305A1 true EP2652305A1 (fr) 2013-10-23
EP2652305B1 EP2652305B1 (fr) 2018-02-21

Family

ID=45315720

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11794043.7A Active EP2652305B1 (fr) 2010-12-18 2011-12-05 Circuit de refroidissement d'un moteur avec recirculation des gaz d'échappement et procédé pour faire fonctionner un moteur à combustion interne avec un tel circuit de refroidissement

Country Status (4)

Country Link
EP (1) EP2652305B1 (fr)
CN (1) CN103370524A (fr)
DE (1) DE102010055072A1 (fr)
WO (1) WO2012079715A1 (fr)

Cited By (1)

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CN106948976A (zh) * 2015-11-18 2017-07-14 本田技研工业株式会社 内燃机的废气净化装置

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GB2502833B (en) * 2012-06-06 2017-07-12 Gm Global Tech Operations Llc Exhaust gas recirculation (EGR) cooling system
CN110719988A (zh) * 2017-06-09 2020-01-21 日立汽车系统株式会社 内燃机的冷却装置及冷却方法
DE102019208959A1 (de) 2019-06-19 2020-12-24 Volkswagen Aktiengesellschaft Brennkraftmaschine mit einem einen AGR-Kühler umfassenden Kühlsystem

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CN106948976A (zh) * 2015-11-18 2017-07-14 本田技研工业株式会社 内燃机的废气净化装置

Also Published As

Publication number Publication date
WO2012079715A1 (fr) 2012-06-21
EP2652305B1 (fr) 2018-02-21
CN103370524A (zh) 2013-10-23
DE102010055072A1 (de) 2012-06-21

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