EP1913243B1 - Systeme de refroidissement pour vehicule et procede pour actionner un systeme de refroidissement - Google Patents

Systeme de refroidissement pour vehicule et procede pour actionner un systeme de refroidissement Download PDF

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Publication number
EP1913243B1
EP1913243B1 EP06776478A EP06776478A EP1913243B1 EP 1913243 B1 EP1913243 B1 EP 1913243B1 EP 06776478 A EP06776478 A EP 06776478A EP 06776478 A EP06776478 A EP 06776478A EP 1913243 B1 EP1913243 B1 EP 1913243B1
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EP
European Patent Office
Prior art keywords
cooling
engine
coolant
return
cooling circuit
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.)
Expired - Fee Related
Application number
EP06776478A
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German (de)
English (en)
Other versions
EP1913243A1 (fr
Inventor
Uwe Haas
Thomas Anzenberger
Thomas Reuss
Günter ZITZLER
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.)
Audi AG
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Audi 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
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Publication of EP1913243A1 publication Critical patent/EP1913243A1/fr
Application granted granted Critical
Publication of EP1913243B1 publication Critical patent/EP1913243B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • 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
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/10—Pumping liquid coolant; Arrangements of coolant pumps
    • F01P2005/105—Using two or more pumps
    • 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
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/10—Pumping liquid coolant; Arrangements of coolant pumps
    • F01P5/12—Pump-driving arrangements
    • F01P2005/125—Driving auxiliary pumps electrically
    • 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
    • F01P2007/146—Controlling of coolant flow the coolant being liquid using valves
    • 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
    • F01P2025/00—Measuring
    • F01P2025/08—Temperature
    • F01P2025/36—Heat exchanger mixed fluid temperature
    • 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
    • F01P2060/08—Cabin heater
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1446—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being exhaust temperatures

Definitions

  • the invention relates to a cooling system for a vehicle according to the preamble of patent claim 1 and to a method for operating a cooling system according to the preamble of patent claim 14.
  • the cooling medium circulates between the components to be cooled, e.g. the engine, the alternator, etc., and the radiator regardless of the engine load with a relatively high, thermostatically controlled temperature of about 100 ° C in order to minimize friction losses on the engine as possible.
  • the main water cooler is structurally divided and a part used as a low-temperature cooler.
  • the main water cooler is divided into a high-temperature part and a low-temperature part. This division leads to problems with thermal stresses and reduces the cooling power that is needed for the actual engine cooling.
  • a cooling system is already known in which an exhaust gas cooling device is integrated in an engine cooling circuit and is connected via a branch line and a return line with lines of Motorlcühlniklaufs.
  • the exhaust gas cooling device can be decoupled from the engine, wherein a Niedertemperatur Vietnamese is formed for cooling the exhaust gas cooling device.
  • the decoupling is temperature dependent with the help of a thermostatic valve. Cooling water then circulates between the exhaust gas cooler and the engine cooler bypassing the engine.
  • a circulating pump is arranged for this purpose.
  • the return line is led from the cooling device in a leading from the engine to the radiator return line.
  • the cooling system according to the invention for a vehicle as well as the method according to the invention for operating a cooling system provide, in addition to the generic features, that a second cooling circuit can be coupled to a coolant return or to a coolant supply line on the output side, depending on operating conditions of an engine. Cooling of a cooling component in the second cooling circuit is ensured in all operating points of the engine.
  • the second cooling circuit is in particular a low-temperature circuit.
  • the engine cooling circuit e.g. in a heating phase of the engine, remain virtually unaffected by the second cooling circuit.
  • the second coolant circuit branches off from the coolant supply line and couples again into the coolant supply line to the engine, wherein the second circuit is connected in parallel to the coolant supply line.
  • the second refrigeration cycle is parallel to the engine cooling circuit when e.g. the second cooling circuit branches off from a coolant supply line and couples into a coolant return. It is advantageously utilized that a cooling power requirement on a low-temperature part and on a high-temperature part of the cooling system rarely occurs simultaneously. For example, the exhaust gas recirculation cooling is required only at partial load. In many operating points, the high-temperature cooling is only slightly loaded, e.g. with radiator thermostat in control mode) and can in principle be used for low-temperature cooling. The fact that no separate low-temperature cooler must be used, costs and space is saved.
  • cooling component in the second cooling circuit may preferably be provided an exhaust gas recirculation cooler, a transmission oil cooler and / or a charge air cooler.
  • a valve is arranged in the return line of the second cooling circuit, which depends on a coolant flow in the engine cooling circuit and / or an engine speed locks or opens a connecting line between the return line and the coolant return.
  • the valve closes automatically when exceeding a coolant volume flow in the engine cooling circuit and / or an engine speed.
  • the valve is preferably a check valve.
  • a first temperature measuring point is arranged in front of the cooling component and / or after a media outlet of a medium to be cooled from the cooling component, a second temperature measuring point. If the cooling component is e.g. an exhaust gas recirculation cooler, the temperature of the cooled exhaust gas and / or the temperature of the supplied coolant can be monitored.
  • the cooling component is e.g. an exhaust gas recirculation cooler
  • an electric pump is arranged in the second cooling circuit.
  • the electric pump is preferably an electric circulating pump. By the electric pump, a higher flow rate of the coolant is achieved in the second cooling circuit.
  • the electric pump is arranged in the branch line. Due to the arrangement of the electric pump in the branch line, the electric pump is arranged in front of the cooling component. This arrangement is advantageous for reasons of space.
  • the electric pump is arranged in the return line upstream of the valve.
  • the electric pump is hereby arranged after the cooling component. If the delivery rate of the pump is no longer sufficient, the valve, in particular a check valve, can open with increasing engine speed and thus increasing flow rate of a motor-driven pump arranged in the engine cooling circuit.
  • a unit for monitoring and / or controlling a flow rate of a coolant volume flow of the circulation pump is provided depending on a quantity of a medium to be cooled in the cooling component.
  • the electric pump can be controlled as needed.
  • a branch of the return of the second cooling circuit is provided, the coolant in the coolant inlet of the engine cooling circuit between Engine radiator and engine introduces.
  • the coolant can enter a heating return to a pump inlet in the engine cooling circuit. The supply of the cooling component with coolant in the second cooling circuit is thus ensured at all operating points.
  • a thermostatic valve is provided for coupling the branch to the coolant supply line.
  • a valve in particular an electrically controlled throttle valve or a hose thermostat, is provided in the branch, which opens when the valve in front of the pump in the return line closes.
  • a check valve is provided in the branch downstream of the valve.
  • an additional cooler is provided to increase the cooling capacity between the engine radiator and the cooling component in the second cooling circuit.
  • the cooling system for a vehicle shown in the figure comprises an engine cooling circuit 39 in which a motor 18 is cooled, and a second cooling circuit 40 in which a cooling component 11 is cooled, e.g. an exhaust gas recirculation cooler.
  • An engine radiator 10 supplies the engine 18 with coolant via a coolant inlet 28 ', 28 and an adjoining coolant inlet 30, which leads to an inlet of a pump 17, preferably a water pump, the motor driven and their flow rate is therefore dependent on the speed of the motor 18 ,
  • a surge tank 26 is connected via a feed line 27.
  • the coolant enters the engine 18 and from there via a firstdemiftel return 31 back to the engine radiator 10 and a second coolant return 32 to a arranged in the coolant inlet 30 main thermostat 16, which is preferably designed as a two-plate thermostat.
  • the main thermostat 16 has a connection for a short-circuit line of the coolant inlet 30, the radiator return 32 and a heating return 33 of a heating unit 25, to which a part of the coolant 18 heated by the engine is supplied.
  • the second cooling circuit 40 is coolant from the engine radiator 10 via a branch 29 from the coolant inlet 28 ', 28 fed.
  • a first temperature measuring point 21 for detecting a coolant temperature is arranged in front of the cooling component 11.
  • the cooling component 11 preferably designed as an exhaust gas recirculation cooler enters a hot exhaust gas 19 and from the cooling component 11, a cooled exhaust gas 20 from.
  • the temperature of the medium cooled in the cooling component 11, e.g. Exhaust gas detectable. From a return 34 branches off a return line 37.
  • a preferably designed as an electric circulation pump 13 is arranged.
  • the electric circulation pump is a water pump.
  • the electric pump 13 is arranged depending on the embodiment, either before or after the cooling component 11. In the figure, both embodiments, both the arrangement in front of the cooling component 11 in the branch line 29, and the arrangement of the pump 13 after the cooling component 11 in the return line 37 and in front of the valve 14 are shown, the pump 13 in the embodiment before Cooling component 11 is dashed and drawn in the embodiment of the cooling component 11 with a solid line.
  • a preferably designed as a check valve 14 valve is arranged in the return line 37. If the pump 13 is arranged in the return line 37, this is arranged between the branch of the line 34 and the valve 14. From the valve 14, a connecting line 38 leads to the coolant return 31 of the engine cooling circuit 39.
  • a valve 12 is arranged, which is preferably designed as an electrically controllable throttle valve or as a hose thermostat.
  • a check valve 15 may connect thereto.
  • a connecting line 36 connects the return line 35 to the heating return 33 and thus to the coolant supply line 30.
  • the pump 13 receives drive signals from a unit 23 for monitoring and / or controlling a delivery rate of a coolant volume flow of the electric pump 13.
  • a preferred exhaust gas recirculation cooler as the cooling component 11 e.g. an operating point specific exhaust gas recirculation amount 24 of a motor control can be specified and the delivery rate of the pump 13 can be set accordingly.
  • the cooling component 11 requires, e.g. for cooling recirculated exhaust gas, cold coolant.
  • the coolant preferably cooling water
  • the valve 12 remains closed, and cold coolant is conveyed by the pump 13 back to an input of the engine radiator 10.
  • a low-temperature circuit between the cooling component 11 and the engine radiator 10 is formed.
  • a coolant volume flow in the low-temperature circuit consisting of the outlet region 28 'of the coolant inlet 28, the branch line 29, the cooling component 11, the return 34, the return line 37, the connecting line 38 and the inlet region 31' of the cooling water return 31, through the unit 23 to the Operating point specific desired quantity 24 can be adapted to cooled, recirculated exhaust gas.
  • the temperatures of the coolant at the first temperature measuring point 21 before the cooling component 11 and the exhaust gas temperature at the second temperature measuring point 22 after the Ruletaustory from the cooling component 11 can optionally be controlled by the cooling component 11 flow rate of the pump 13 and possibly. Be monitored.
  • valve 12 in the return line 35 it is achieved that the low-temperature cooling water can not affect the heating behavior of the motor 18. Namely, as long as the engine speed remains low, the delivery rate of the pump 13 is sufficient to maintain a circulating low-temperature cycle between the cooling component 11 and the engine radiator 10.
  • the valve 14 closes and prevents backward flow of the cooling component 11.
  • the valve 12 opens in the return 35 and allows a direct flow of coolant into the heating return 33 and the coolant inlet 30 and the pump inlet of the pump 17 in front of the engine 10. The cooling by the cooling component 11 is thus ensured in all operating points.
  • an additional cooler can optionally be integrated between the engine radiator 10 and the cooling component 11.

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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)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)

Claims (15)

  1. Système de refroidissement pour un véhicule avec un moteur (18), un radiateur de moteur (10) et un circuit de refroidissement de moteur (39), dans lequel un second circuit de refroidissement (40) avec au moins un composant de refroidissement (11) peut être couplé au radiateur de moteur (10) et est relié à une conduite de dérivation (29) depuis une conduite d'amenée de milieu de refroidissement (28) du circuit de refroidissement de moteur (39) et avec une conduite de retour (34, 37, 38) depuis le composant de refroidissement (11) au retour de milieu de refroidissement (31) du circuit de refroidissement de moteur (39), caractérisé en ce que le second circuit de refroidissement (40) peut être couplé indépendamment des conditions de fonctionnement du moteur (10) côté sortie au choix au retour de milieu de refroidissement (31) ou à une conduite d'amenée de milieu de refroidissement (30).
  2. Système de refroidissement selon la revendication 1, caractérisé en ce que dans la conduite de retour (37) du second circuit de refroidissement (40) est disposé un clapet (14) qui bloque ou ouvre en fonction d'un débit volumique de milieu de refroidissement dans le circuit de refroidissement de moteur (39) et/ou d'un régime du moteur (18) une conduite de liaison (38) entre la conduite de retour (37) et le retour de milieu de refroidissement (31).
  3. Système de refroidissement selon la revendication 2, caractérisé en ce que le clapet (14) se ferme automatiquement en cas de dépassement d'un débit volumique de milieu de refroidissement et/ou d'un régime moteur.
  4. Système de refroidissement selon la revendication 2 ou 3, caractérisé en ce qu'une pompe (13) électrique est disposée dans le second circuit de refroidissement (40).
  5. Système de refroidissement selon la revendication 4, caractérisé en ce que la pompe (13) électrique est disposée en amont du composant de refroidissement (11).
  6. Système de refroidissement selon la revendication 4, caractérisé en ce que la pompe (13) électrique est disposée en aval du composant de refroidissement (11).
  7. Système de refroidissement selon la revendication 6, caractérisé en ce que la pompe (13) électrique est disposée dans la conduite de retour (37) en amont du clapet (14).
  8. Système de refroidissement selon au moins l'une quelconque des revendications précédentes, caractérisé en ce qu'une unité (23) de surveillance et/ou de commande d'un débit de refoulement d'un débit volumique de milieu de refroidissement de la pompe (13) électrique en fonction d'une quantité d'un milieu à refroidir dans le composant de refroidissement (11) est prévue.
  9. Système de refroidissement selon au moins l'une quelconque des revendications précédentes, caractérisé en ce qu'une dérivation (35, 36) du retour (34) du second circuit de refroidissement (40) est prévue, laquelle introduit le milieu de refroidissement dans la conduite d'amenée de milieu de refroidissement (30) du circuit de refroidissement de moteur (39) entre le radiateur de moteur (10) et le moteur (18).
  10. Système de refroidissement selon au moins l'une quelconque des revendications précédentes, caractérisé en ce qu'une soupape thermostatique (16) est prévue pour le couplage de la dérivation (35, 36) à la conduite d'amenée de liquide de refroidissement (30).
  11. Système de refroidissement selon la revendication 9 ou 10, caractérisé en ce qu'un clapet (12) est prévu dans la dérivation (35), lequel ouvre si le clapet (14) se ferme dans la conduite de retour (37).
  12. Système de refroidissement selon au moins l'une quelconque des revendications 9 à 11, caractérisé en ce qu'un clapet antiretour (15) est prévu dans la dérivation (35) en aval du clapet (12).
  13. Système de refroidissement selon au moins l'une quelconque des revendications précédentes, caractérisé en ce qu'un radiateur supplémentaire est prévu entre le radiateur de moteur (10) et le composant de refroidissement (11) dans le second circuit de refroidissement (40).
  14. Procédé de fonctionnement d'un système de refroidissement pour un véhicule avec un moteur (18), un radiateur de moteur (10) et un circuit de refroidissement de moteur (39), dans lequel un second circuit de refroidissement (40) avec au moins un composant de refroidissement (11) est couplé au radiateur de moteur (10) et est relié avec une conduite de dérivation (28) depuis une conduite d'amenée de liquide de refroidissement (29) du circuit de refroidissement de moteur (39) et avec une conduite de retour (34, 37, 38) depuis le composant de refroidissement (11) à un retour de liquide de refroidissement (31) du circuit de refroidissement de moteur (39), caractérisé en ce que le second circuit de refroidissement (40) est couplé en fonction des conditions de fonctionnement du moteur (10) côté sortie au choix au retour de milieu de refroidissement (31) ou à une conduite d'amenée de milieu de refroidissement (30).
  15. Procédé selon la revendication 14, caractérisé en ce qu'un débit volumique de milieu de refroidissement dans le second circuit de refroidissement (40) est réglé en fonction d'une quantité prescrite d'un milieu à refroidir dans le composant de refroidissement (11).
EP06776478A 2005-07-28 2006-07-27 Systeme de refroidissement pour vehicule et procede pour actionner un systeme de refroidissement Expired - Fee Related EP1913243B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102005035297 2005-07-28
DE102006020951A DE102006020951A1 (de) 2005-07-28 2006-05-05 Kühlsystem für ein Fahrzeug und Verfahren zum Betreiben eines Kühlsystems
PCT/EP2006/007473 WO2007012493A1 (fr) 2005-07-28 2006-07-27 Systeme de refroidissement pour vehicule et procede pour actionner un systeme de refroidissement

Publications (2)

Publication Number Publication Date
EP1913243A1 EP1913243A1 (fr) 2008-04-23
EP1913243B1 true EP1913243B1 (fr) 2009-09-16

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EP06776478A Expired - Fee Related EP1913243B1 (fr) 2005-07-28 2006-07-27 Systeme de refroidissement pour vehicule et procede pour actionner un systeme de refroidissement

Country Status (5)

Country Link
US (1) US8136488B2 (fr)
EP (1) EP1913243B1 (fr)
CN (1) CN101184910B (fr)
DE (2) DE102006020951A1 (fr)
WO (1) WO2007012493A1 (fr)

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US20090229542A1 (en) 2009-09-17
US8136488B2 (en) 2012-03-20
CN101184910A (zh) 2008-05-21
WO2007012493A1 (fr) 2007-02-01
DE102006020951A1 (de) 2007-02-01
DE502006004883D1 (de) 2009-10-29
EP1913243A1 (fr) 2008-04-23
CN101184910B (zh) 2011-02-09

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