EP1913243A1 - Cooling system for a vehicle, and method for the operation of a cooling system - Google Patents

Cooling system for a vehicle, and method for the operation of a cooling system

Info

Publication number
EP1913243A1
EP1913243A1 EP06776478A EP06776478A EP1913243A1 EP 1913243 A1 EP1913243 A1 EP 1913243A1 EP 06776478 A EP06776478 A EP 06776478A EP 06776478 A EP06776478 A EP 06776478A EP 1913243 A1 EP1913243 A1 EP 1913243A1
Authority
EP
European Patent Office
Prior art keywords
cooling
engine
coolant
cooling circuit
cooling system
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
EP06776478A
Other languages
German (de)
French (fr)
Other versions
EP1913243B1 (en
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
Original Assignee
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
Application filed by Audi AG filed Critical Audi AG
Publication of EP1913243A1 publication Critical patent/EP1913243A1/en
Application granted granted Critical
Publication of EP1913243B1 publication Critical patent/EP1913243B1/en
Ceased legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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 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 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 the engine cooling circuit.
  • the exhaust gas cooling device can be decoupled from the engine, wherein a low-temperature circuit for cooling the exhaust gas cooling device is formed.
  • 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 for example, 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 cooling circuit is parallel to the motor ' cooling circuit, if, for example, the second cooling circuit branches off from a coolant supply line and coupled 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, exhaust gas recirculation cooling is required only at partial load. In many operating points, the high-temperature cooling is only slightly loaded, eg with radiator thermostat in control mode) and can be used in principle 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 required.
  • a branch of the return of the second cooling circuit is provided, the coolant in the coolant inlet of the engine cooling circuit between see 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 first coolant return 31 back to the engine radiator 10 and a second coolant return. run 32 to a arranged in the coolant inlet 30 main thermostat 16, which is preferably designed as a two-cell 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.
  • both embodiments, both the type before 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, wherein the pump 13 in the embodiment before the cooling component 11 is dashed lines 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, by 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.

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

Abstract

The invention relates to a cooling system for a vehicle comprising an engine (18), an engine radiator (10), and an engine cooling circuit (39). A second cooling circuit (40) encompassing at least one cooling component (11) can be coupled to the engine radiator (10) and is connected to a coolant recirculation pipe (31) of the engine cooling circuit (39) by means of a branch (29) of a coolant supply pipe (28) of the engine cooling circuit (39) and a recirculation pipe (34, 37, 38) of the cooling component (11). The second cooling circuit (38) can be alternatively coupled to the coolant recirculation pipe (31) or a coolant supply pipe (30) at the output end in accordance with operating conditions of the engine (10).

Description

Kühlsystem für ein Fahrzeug und Verfahren zum Betreiben eines Cooling system for a vehicle and method of operating a
Kühlsystemscooling system
Die Erfindung betrifft ein Kühlsystem für ein Fahrzeug gemäß dem Oberbegriff des Patentanspruchs 1 und ein Verfahren zum Betreiben eines Kühlsystems gemäß dem Oberbegriff des Patentanspruchs 14.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.
In heutigen Fahrzeug-Kühlsystemen zirkuliert das Kühlmedium zwischen den zu kühlenden Bauteilen, z.B. dem Motor, der Lichtmaschine etc., und dem Kühler unabhängig von der Motorlast mit einer relativ hohen, thermostatgeregelten Temperatur von etwa 1000C, um Reibungsverluste am Motor möglichst zu minimieren. Wird zur Kühlung von bestimmten Bauteilen oder Betriebsmedien, z.B. Getriebe, Abgasrückführung, Ladeluft etc., Kühlwasser mit wesentlich geringerer Temperatur benötigt, so wird ein eigener Kreislauf mit separatem Niedertemperaturkühler notwendig. Oft wird der Hauptwasserkühler konstruktiv unterteilt und ein Teil als Niedertemperaturkühler verwendet. Am Fahrzeug sind entweder zwei Kühler verbaut, ein Hochtemperaturkühler und ein Niedrigtemperaturkühler, was Bauraumprobleme schafft, oder der Hauptwasserkühler ist in einen Hochtemperaturteil und einen Niedertemperaturteil unterteilt. Diese Unterteilung führt zu Problemen mit Thermospannungen und verringert die Kühlleistung, die zur eigentlichen Motorkühlung benötigt wird.In today's vehicle cooling systems circulates the coolant between the components to be cooled, eg the engine, the alternator, etc., and the radiator regardless of the engine load with a relatively high, thermostatically controlled temperature of about 100 0 C to minimize friction losses on the engine as possible , If cooling water with significantly lower temperature is required for cooling certain components or operating media, eg gearboxes, exhaust gas recirculation, charge air etc., then a separate circuit with separate low-temperature cooler is required. Often, the main water cooler is structurally divided and a part used as a low-temperature cooler. On the vehicle either two radiators are installed, a high-temperature radiator and a low-temperature radiator, which creates space problems, or 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.
Aus der DE 196 33 190 A1 ist bereits ein Kühlsystem bekannt, bei der eine Abgaskühleinrichtung in einen Motorkühlkreislauf integriert ist und über eine Abzweigleitung und eine Rückleitung mit Leitungen des Motorkühlkreislaufs verbunden ist. Bei einer Aufwärmphase des Motors kann die Abgaskühleinrichtung vom Motor entkoppelt werden, wobei ein Niedertemperaturkreislauf zur Kühlung der Abgaskühleinrichtung gebildet wird. Die Entkopplung erfolgt temperaturabhängig mit Hilfe eines Thermostatventils. Kühlwasser zirkuliert dann zwischen Abgaskühleinrichtung und Motorkühler unter Umgehung des Motors. In der Abzweigleitung, die von einer vom Motorkühler zum Motor führenden Kühlmittelleitung abzweigt, ist dazu eine Umwälzpumpe angeordnet. Die Rückleitung ist von der Kühleinrichtung in eine vom Motor zu dem Motorkühler führende Rückleitung geführt. Es ist Aufgabe der vorliegenden Erfindung, ausgehend vom Stand der Technik ein Kühlsystem zu schaffen, das einen bedarfsgerechten verbesserten Niedertemperaturkreislauf zur Verfügung stellt.From DE 196 33 190 A1, 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 the engine cooling circuit. During a warm-up phase of the engine, the exhaust gas cooling device can be decoupled from the engine, wherein a low-temperature circuit for cooling the exhaust gas cooling device is formed. 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. In the branch line, which branches off from a coolant line leading from the engine radiator to 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. It is an object of the present invention, starting from the state of the art, to provide a cooling system which provides a demand-adapted improved low-temperature circuit.
Die Aufgabe wird erfindungsgemäß mit den Merkmalen des Patentanspruchs 1 und des Patentanspruchs 14 gelöst. Vorteilhafte Weiterbildungen der Erfindung sind in Unteransprüchen angegeben.The object is achieved with the features of claim 1 and claim 14. Advantageous developments of the invention are specified in subclaims.
Das erfindungsgemäße Kühlsystem für ein Fahrzeug wie auch das erfindungsgemäße Verfahren zum Betreiben eines Kühlsystems sehen neben den gattungsgemäßen Merkmalen vor, dass ein zweiter Kühlkreislauf abhängig von Betriebsbedingungen eines Motors ausgangsseitig wahlweise an einen Kühlmittelrücklauf oder an eine Kühlmittelzuleitung koppelbar ist. Eine Kühlung einer Kühlkomponente im zweiten Kühlkreislauf ist in allen Betriebspunkten des Motors gewährleistet. Der zweite Kühlkreislauf ist insbesondere ein Niedertemperaturkreislauf. Gleichzeitig kann der Motorkühlkreislauf, z.B. in einer Aufheizphase des Motors, vom zweiten Kühlkreislauf praktisch unbeeinflusst bleiben. In einem Betriebszustand zweigt der zweite Kühlmittelkreislauf von der Kühlmittelzuleitung ab und koppelt wieder in die Kühlmittelzuleitung zum Motor ein, wobei der zweite Kreislauf parallel zur Kühlmittelzuleitung geschaltet ist. Wird der Kühlkreislauf abhängig von Betriebsbedingungen umgeschaltet, verläuft der zweite Kühlkreis parallel zum Motor- ' kühlkreis, wenn z.B. der zweite Kühlkreis von einer Kühlmittelzuleitung abzweigt und in einen Kühlmittelrücklauf einkoppelt. Es wird vorteilhaft ausgenutzt, dass eine Kühlleistungsanforderung an einen Niedertemperaturteil und an einen Hochtemperaturteil des Kühlsystems selten gleichzeitig auftritt. Beispielsweise wird die Abgasrückführungs- Kühlung nur bei Teillast benötigt. In vielen Betriebspunkten ist die Hochtemperatur- Kühlung nur gering belastet, z.B. mit Kühlerthermostat im Regelbetrieb) und kann prinzipiell zur Niedertemperaturkühlung verwendet werden. Dadurch, dass kein separater Niedertemperaturkühler eingesetzt werden muss, werden Kosten und Bauraum gespart. Es werden auch Probleme mit Thermospannungen am Motorkühler, die bei Unterteilung des Motorkühlers in einen Hochtemperaturteil und einen Niedertemperaturteil entstehen würden, vermieden. Als Kühlkomponente im zweiten Kühlkreislauf kann bevorzugt ein Abgasrückführungskühler, ein Getriebeölkühler und/oder ein Ladeluftkühler vorgesehen sein.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. At the same time, the engine cooling circuit, for example, in a heating phase of the engine, remain virtually unaffected by the second cooling circuit. In an operating state, 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. If the cooling circuit is switched depending on operating conditions, the second cooling circuit is parallel to the motor ' cooling circuit, if, for example, the second cooling circuit branches off from a coolant supply line and coupled 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, exhaust gas recirculation cooling is required only at partial load. In many operating points, the high-temperature cooling is only slightly loaded, eg with radiator thermostat in control mode) and can be used in principle for low-temperature cooling. The fact that no separate low-temperature cooler must be used, costs and space is saved. It also problems with thermal stresses on the engine radiator, which would result in subdivision of the engine radiator in a high-temperature part and a low-temperature part, avoided. As 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.
In einer günstigen Ausgestaltung ist in der Rückleitung des zweiten Kühlkreislaufs ein Ventil angeordnet, das abhängig von einer Kühlmittelstrommenge im Motorkühlkreislauf und/oder einer Motordrehzahl eine Verbindungsleitung zwischen der Rückleitung und dem Kühlmittelrücklauf sperrt oder öffnet.In a favorable embodiment, 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.
In einer günstigen Ausgestaltung schließt das Ventil bei Übersteigen eines Kühlmittelvolumenstroms im Motorkühlkreislauf und/oder einer Motordrehzahl selbsttätig. Das Ventil ist bevorzugt ein Rückschlagventil.In a favorable embodiment, 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.
In einer günstigen Ausgestaltung ist vor der Kühlkomponente eine erste Temperaturmessstelle angeordnet und/oder nach einem Medienaustritt eines zu kühlenden Mediums aus der Kühlkomponente eine zweite Temperaturmessstelle. Ist die Kühlkomponente z.B. ein Abgasrückführungskühler, kann die Temperatur des gekühlten Abgases und/oder der Temperatur des zugeführten Kühlmittels überwacht werden.In a favorable embodiment, 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.
In einer günstigen Ausgestaltung ist im zweiten Kühlkreislauf eine elektrische Pumpe angeordnet. Die elektrische Pumpe ist bevorzugt eine elektrische Umwälzpumpe. Durch die elektrische Pumpe wird eine höhere Fördermenge des Kühlmittels im zweiten Kühlkreislauf erreicht.In a favorable embodiment, 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.
In einer günstigen Ausgestaltung ist die elektrische Pumpe in der Abzweigleitung angeordnet. Auf Grund der Anordnung der elektrischen Pumpe in der Abzweigleitung ist die elektrische Pumpe vor der Kühlkomponente angeordnet. Diese Anordnung ist aus Platzgründen vorteilhaft.In a favorable embodiment, 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.
In einer günstigen Ausgestaltung ist die elektrische Pumpe in der Rückleitung stromaufwärts des Ventils angeordnet. Die elektrische Pumpe ist hiermit nach der Kühlkomponente angeordnet. Reicht die Förderleistung der Pumpe nicht mehr aus, kann das Ventil, insbesondere ein Rückschlagventil, bei ansteigender Motordrehzahl und damit ansteigender Fördermenge einer im Motorkühlkreis angeordneten motorangetriebenen Pumpe öffnen.In a favorable embodiment, 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.
In einer günstigen Ausgestaltung ist eine Einheit zur Überwachung und/oder Steuerung einer Fördermenge eines Kühlmittelvolumenstroms der Umwälzpumpe abhängig von einer Menge eines in der Kühlkomponente zu kühlenden Mediums vorgesehen. Die e- lektrische Pumpe kann nach Bedarf angesteuert werden.In a favorable embodiment, 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 required.
In einer günstigen Ausgestaltung ist ein Abzweig des Rücklaufs des zweiten Kühlkreislaufs vorgesehen, der Kühlmittel in den Kühlmittelzulauf des Motorkühlkreislaufs zwi- sehen Motorkühler und Motor einführt. Das Kühlmittel kann z.B. in einen Heizungsrücklauf zu einem Pumpeneintritt im Motorkühlkreis gelangen. Die Versorgung der Kühlkomponente mit Kühlmittel im zweiten Kühlkreislauf ist damit in allen Betriebspunkten sichergestellt.In a favorable embodiment, a branch of the return of the second cooling circuit is provided, the coolant in the coolant inlet of the engine cooling circuit between see engine radiator and engine introduces. For example, 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.
In einer günstigen Ausgestaltung ist zur Kopplung des Abzweigs an die Kühlmittelzuleitung ein Thermostatventil vorgesehen.In a favorable embodiment, a thermostatic valve is provided for coupling the branch to the coolant supply line.
In einer günstigen Ausgestaltung ist in dem Abzweig ein Ventil, insbesondere ein elektrisch angesteuertes Drosselventil oder ein Schlauchthermostat, vorgesehen, das öffnet, wenn das Ventil vor der Pumpe in der Rückleitung schließt.In a favorable embodiment, 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.
In einer günstigen Ausgestaltung ist im Abzweig stromabwärts des Ventils ein Rückschlagventil vorgesehen.In a favorable embodiment, a check valve is provided in the branch downstream of the valve.
In einer günstigen Ausgestaltung ist zur Steigerung der Kühlleistung zwischen dem Motorkühler und der Kühlkomponente im zweiten Kühlkreislauf ein zusätzlicher Kühler vorgesehen.In a favorable embodiment, an additional cooler is provided to increase the cooling capacity between the engine radiator and the cooling component in the second cooling circuit.
Weitere Ausbildungsformen und Aspekte der Erfindung werden unabhängig von einer Zusammenfassung in den Patentansprüchen ohne Beschränkung der Allgemeinheit im Folgenden anhand einer Zeichnung näher erläutert. Dabei zeigt die einzige Figur eine Prinzipskizze einer Verschaltung eines bevorzugten Kühlsystems.Further embodiments and aspects of the invention are explained in greater detail below with reference to a drawing, independently of a summary in the patent claims without limiting the generality. The single figure shows a schematic diagram of an interconnection of a preferred cooling system.
Das in der Figur dargestellte Kühlsystem für ein Fahrzeug umfasst einen Motorkühlkreislauf 39, in dem ein Motor 18 gekühlt wird, und einen zweiten Kühlkreislauf 40, in dem eine Kühlkomponente 11 gekühlt wird, z.B. ein Abgasrückführungskühler.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.
Ein Motorkühler 10 versorgt den Motor 18 mit Kühlmittel über einen Kühlmittelzulauf 28', 28 und einen daran anschließenden Kühlmittelzulauf 30, der an einem Eingang einer Pumpe 17 führt, bevorzugt einer Wasserpumpe, die motorangetrieben und deren Fördermenge daher abhängig von der Drehzahl des Motors 18 ist. Am Motorkühler 10 bzw. dessen Kühlmittelzulauf 28 ist ein Ausgleichsbehälter 26 über eine Zuleitung 27 angeschlossen.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 , At the radiator 10 and the coolant inlet 28, a surge tank 26 is connected via a feed line 27.
Über die Pumpe 17 gelangt das Kühlmittel in den Motor 18 und von dort über einen ersten Kühlmittelrücklauf 31 zurück zum Motorkühler 10 und einen zweiten Kühlmittelrück- lauf 32 zu einem im Kühlmittelzulauf 30 angeordneten Hauptthermostat 16, der bevorzugt als Zweitellerthermostat ausgebildet ist. Der Hauptthermostat 16 weist einen An- schluss für eine Kurzschlussleitung des Kühlmittelzulaufs 30, den Kühlerrücklauf 32 und einen Heizungsrücklauf 33 einer Heizungseinheit 25 auf, der ein Teil des vom Motor 18 erwärmten Kühlmittels zugeführt wird.Via the pump 17, the coolant enters the engine 18 and from there via a first coolant return 31 back to the engine radiator 10 and a second coolant return. run 32 to a arranged in the coolant inlet 30 main thermostat 16, which is preferably designed as a two-cell 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.
Dem zweiten Kühlkreislauf 40 ist Kühlmittel vom Motorkühler 10 über einen Abzweig 29 aus dessen Kühlmittelzulauf 28', 28 zuführbar. Im Abzweig 29 ist vor der Kühlkomponente 11 eine erste Temperaturmessstelle 21 zur Erfassung einer Kühlmitteltemperatur angeordnet. In die bevorzugt als Abgasrückführungskühler ausgebildete Kühlkomponente 11 tritt ein heißes Abgas 19 ein und aus der Kühlkomponente 11 ein gekühltes Abgas 20 aus. An einer zweiten Temperaturmessstelle 22 ist die Temperatur des in der Kühlkomponente 11 gekühlten Mediums, z.B. Abgas, erfassbar. Aus einem Rücklauf 34 zweigt eine Rückleitung 37 ab.The second cooling circuit 40 is coolant from the engine radiator 10 via a branch 29 from the coolant inlet 28 ', 28 fed. In branch 29, a first temperature measuring point 21 for detecting a coolant temperature is arranged in front of the cooling component 11. In 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. At a second temperature measuring point 22, 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.
In dem zweiten Kühlkreislauf 40 ist eine bevorzugt als elektrische Umwälzpumpe ausgebildete Pumpe 13 angeordnet. Bevorzugt ist die elektrische Umwälzpumpe eine Wasserpumpe. Hierbei ist die elektrische Pumpe 13 je nach Ausführungsbeispiel entweder vor oder nach der Kühlkomponente 11 angeordnet. In der Figur sind beide Ausführungsar- ten, sowohl die Artordnung vor der Kühlkomponente 11 in der Abzweigleitung 29, als auch die Anordnung der Pumpe 13 nach der Kühlkomponente 11 in der Rückleitung 37 und vor dem Ventil 14 gezeigt, wobei die Pumpe 13 in der Ausführungsart vor der Kühlkomponente 11 strichliert und in der Ausführungsart nach der Kühlkomponente 11 mit durchgezogener Linie gezeichnet ist.In the second cooling circuit 40, a preferably designed as an electric circulation pump 13 is arranged. Preferably, the electric circulation pump is a water pump. Here, 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 type before 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, wherein the pump 13 in the embodiment before the cooling component 11 is dashed lines and drawn in the embodiment of the cooling component 11 with a solid line.
In der Rückleitung 37 ist ein bevorzugt als Rückschlagventil ausgebildetes Ventil 14 angeordnet. Ist die Pumpe 13 in der Rückleitung 37 angeordnet, ist diese zwischen dem Abzweig aus der Leitung 34 und dem Ventil 14 angeordnet. Von dem Ventil 14 führt eine Verbindungsleitung 38 zum Kühlmittelrücklauf 31 des Motorkühlkreislaufs 39.In the return line 37, a preferably designed as a check valve 14 valve is arranged. 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.
Aus dem Rücklauf 34 zweigt eine weitere Rückleitung 35 ab, in der ein Ventil 12 angeordnet ist, das bevorzugt als elektrisch ansteuerbares Drosselventil oder als Schlauchthermostat ausgebildet ist. Optional kann sich ein Rückschlagventil 15 daran anschließen. Eine Verbindungsleitung 36 verbindet die Rückleitung 35 mit dem Heizungsrücklauf 33 und damit mit der Kühlmittelzuleitung 30. . .From the return 34 branches off a further return line 35, in which a valve 12 is arranged, which is preferably designed as an electrically controllable throttle valve or as a hose thermostat. Optionally, 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. , ,
Die Pumpe 13 erhält Ansteuersignale von einer Einheit 23 zur Überwachung und/oder Steuerung einer Fördermenge eines Kühlmittelvolumenstroms der elektrischen Pumpe 13. Bei einem bevorzugten Abgasrückführungskühler als Kühlkomponente 11 kann z.B. eine betriebspunktspezifische Abgasrückführungsmenge 24 einer Motorsteuerung vorgegeben werden und die Fördermenge der Pumpe 13 entsprechend eingestellt werden.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. In 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.
Die Kühlkomponente 11 benötigt, z.B. zur Kühlung von rückgeführtem Abgas, kaltes Kühlmittel. Zu diesem Zweck wird das Kühlmittel, bevorzugt Kühlwasser, am Ausgang des Motorkühlers 10 entnommen. Wird am Ausgang der Kühlkomponente 11 ein Temperaturgrenzwert nicht erreicht, so bleibt das Ventil 12 geschlossen, und kaltes Kühlmittel wird von der Pumpe 13 wieder zurück an einen Eingang des Motorkühlers 10 gefördert. Ein Niedertemperaturkreislauf zwischen der Kühlkomponente 11 und dem Motorkühler 10 entsteht. Ein Kühlmittelvolumenstrom im Niedertemperaturkreis, bestehend aus dem Austrittsbereich 28' des Kühlmittelzulaufs 28, der Abzweigleitung 29, der Kühlkomponente 11 , des Rücklaufs 34, der Rückleitung 37, der Verbindungsleitung 38 und dem Eintrittsbereich 31' des Kühlwasserrücklaufs 31, kann durch die Einheit 23 an die betriebspunktspezifische Wunschmenge 24 an gekühltem, rückgeführtem Abgas angepasst werden. Durch die Temperaturen des Kühlmittels an der ersten Temperaturmessstelle 21 vor der Kühlkomponente 11 und der Abgastemperatur an der zweiten Temperaturmessstelle 22 nach dem Medientautritt aus der Kühlkomponente 11 kann optional der durch die Kühlkomponente 11 fließende Förderstrom der Pumpe 13 geregelt und ggfs. überwacht werden.The cooling component 11 requires, e.g. for cooling recirculated exhaust gas, cold coolant. For this purpose, the coolant, preferably cooling water, taken at the outlet of the engine radiator 10. If a temperature limit value is not reached at the outlet of the cooling component 11, 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, by the unit 23 to the Operating point specific desired quantity 24 can be adapted to cooled, recirculated exhaust gas. By 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 Medientautritt from the cooling component 11 can optionally be controlled by the cooling component 11 flow rate of the pump 13 and possibly. Be monitored.
Durch das Ventil 12 im Rücklauf 35 wird erreicht, dass das Niedertemperatur- Kühlwasser das Aufheizverhalten des Motors 18 nicht beeinträchtigen kann. Solange nämlich die Motordrehzahl gering bleibt, reicht die Förderleistung der Pumpe 13 aus, um einen zirkulierenden Niedertemperaturkreislauf zwischen der Kühlkomponente 11 und dem Motorkühler 10 aufrecht zu erhalten. Steigt die Motordrehzahl über einen Grenzwert, so schließt das Ventil 14 und verhindert eine rückwärtige Durchströmung der Kühlkomponente 11. Zu diesem Zeitpunkt öffnet das Ventil 12 im Rücklauf 35 und ermöglicht einen direkten Kühlmittelstrom in den Heizungsrücklauf 33 bzw. den Kühlmittelzulauf 30 und zum Pumpeneintritt der Pumpe 17 vor dem Motor 10. Die Kühlung durch die Kühlkomponente 11 ist damit in allen Betriebspunkten sichergestellt. Zur weiteren Steigerung der Kühlleistung kann zwischen dem Motorkühler 10 und der Kühlkomponente 11 noch optional ein zusätzlicher Kühler eingebunden werden. BEZUGSZEICHEN LISTEBy the 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. When the engine speed rises above a limit, the valve 14 closes and prevents backward flow of the cooling component 11. At this time, 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. To further increase the cooling capacity, an additional cooler can optionally be integrated between the engine radiator 10 and the cooling component 11. REFERENCE LIST
Motorkühler Kühlkomponente Ventil Pumpe Ventil Rückschlagventil Hauptthermostat motorangetriebene Pumpe Motor Abgas vor Kühlkomponente ' " * Abgas nach Kühlkomponente Temperaturmessstelle nach Kühlkomponente Temperaturmessstelle vor Kühlkomponente - •■ • • Überwachungseinheit betriebspunktspezifische Abgasrückführungsmenge der Motorsteuerung Heizung Behälter Zuleitung Kühlmittelzuleitung ' Austrittsbereich aus Motorkühler Abzweig Kühlmittelzuleitung Kühlerrücklauf ' Eintrittsbereich in Motorkühler Kühlerrücklauf Heizungsrücklauf Rücklauf Abzweig Verbindungsleitung Rückleitung zu elektrischer Pumpe Verbindungsleitung Motorkühlkreislauf zweiter Kreislauf Engine cooler Cooling component Valve Pump Valve Non-return valve Main thermostat Motor-driven pump Engine Exhaust before cooling component '" Exhaust after cooling component Temperature measuring point after cooling component Temperature measuring point before cooling component - • ■ • • Monitoring unit operating point specific exhaust gas recirculation quantity of engine control unit Heating tank Supply line Coolant supply line' Outlet area from engine radiator Branch coolant supply Radiator return 'Entry area in engine radiator Radiator return Heating return Return branch Connecting line Return line to electric pump Connecting line Engine cooling circuit, second circuit

Claims

PATENTANSPRÜCHE
1. Kühlsystem für ein Fahrzeug mit einem Motor (18), einem Motorkühler (10) und einem Motorkühlkreislauf (39), wobei ein zweiter Kühlkreislauf (40) mit mindestens einer Kühlkomponente (11) an den Motorkühler (10) ankoppelbar ist und mit einer Abzweigleitung (29) von einer Kühlmittelzuleitung (28) des Motorkühlkreislaufs (39) und mit einer Rückleitung (34, 37, 38) von der Kühlkomponente (11) mit einem Kühlmittelrücklauf (31) des Motorkühlkreislaufs (39) verbunden ist, dadurch gekennzeichnet, dass der zweite Kühlkreislauf (40) abhängig von Betriebsbedingungen des Motors (10) ausgangsseitig wahlweise an den Kühlmittelrücklauf (31) oder an eine Kühlmittelzuleitung (30) koppelbar ist.1. A cooling system for a vehicle with an engine (18), an engine radiator (10) and an engine cooling circuit (39), wherein a second cooling circuit (40) with at least one cooling component (11) to the engine radiator (10) can be coupled and with a Branch line (29) from a coolant supply line (28) of the engine cooling circuit (39) and with a return line (34, 37, 38) from the cooling component (11) with a coolant return (31) of the engine cooling circuit (39) is connected, characterized in that the second cooling circuit (40) depending on operating conditions of the engine (10) on the output side either to the coolant return (31) or to a coolant supply line (30) can be coupled.
2. Kühlsystem nach Anspruch 1 , dadurch gekennzeichnet, dass in der Rückleitung (37) des zweiten Kühlkreislaufs (40) ein Ventil (14) angeordnet ist, das ab- " '' hängig von einem Kühlmittelvolumenstrom im Motorkühlkreislauf (38) und/oder einer Motordrehzahl des Motors (18) eine Verbindungsleitung (38) zwischen der' Rückleitung (37) und dem Kühlmittelrücklauf (31) sperrt oder öffnet:2. A cooling system according to claim 1, characterized in that in the return line (37) of the second refrigeration circuit (40) is a valve (14) off "'' dependent from a coolant volumetric flow in the engine cooling circuit (38) and / or Engine speed of the motor (18) a connecting line (38) between the ' return line (37) and the coolant return (31) blocks or opens:
3. Kühlsystem nach Anspruch 1 , dadurch gekennzeichnet, dass das Ventil (14) bei Übersteigen eines Kühlmittelvolumenstroms und/oder einer Motordrehzahl selbsttätig schließt.3. Cooling system according to claim 1, characterized in that the valve (14) automatically closes upon exceeding a coolant volume flow and / or an engine speed.
4. Kühlsystem nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass im zweiten Kühlkreislauf (40) eine elektrische Pumpe (13) angeordnet ist.4. Cooling system according to claim 2 or 3, characterized in that in the second cooling circuit (40) an electric pump (13) is arranged.
5. Kühlsystem nach Anspruch 4, dadurch gekennzeichnet, dass die elektrische Pumpe (13) stromaufwärts der Kühlkomponente (11) angeordnet ist.5. Cooling system according to claim 4, characterized in that the electric pump (13) upstream of the cooling component (11) is arranged.
6. Kühlsystem nach Anspruch 4, dadurch gekennzeichnet, dass die elektrische Pumpe (13) stromabwärts der Kühlkomponente (11) angeordnet ist.6. Cooling system according to claim 4, characterized in that the electric pump (13) downstream of the cooling component (11) is arranged.
7. Kühlsystem nach Anspruch 6, dadurch gekennzeichnet, dass die elektrische Pumpe (13) in der Rückleitung (37) stromaufwärts des Ventils (14) angeordnet ist. 7. Cooling system according to claim 6, characterized in that the electric pump (13) in the return line (37) upstream of the valve (14) is arranged.
8. Kühlsystem nach zumindest einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass eine Einheit (23) zur Überwachung und/oder Steuerung einer Fördermenge eines Kühlmittelvolumenstroms der elektrischen Pumpe (13) abhängig von einer Menge eines in der Kühlkomponente (11) zu kühlenden Mediums vorgesehen ist.8. Cooling system according to at least one of the preceding claims, characterized in that a unit (23) for monitoring and / or controlling a flow rate of a coolant volume flow of the electric pump (13) depending on a quantity of in the cooling component (11) to be cooled medium provided is.
9. Kühlsystem nach zumindest einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass ein Abzweig (35, 36) des Rücklaufs (34) des zweiten Kühlkreislaufs (40) vorgesehen ist, der Kühlmittel in den Kühlmittelzulauf (30) des Motorkühlkreislaufs (39) zwischen Motorkühler (10) und Motor (18) einführt.9. A cooling system according to at least one of the preceding claims, characterized in that a branch (35, 36) of the return line (34) of the second cooling circuit (40) is provided, the coolant in the coolant inlet (30) of the engine cooling circuit (39) between the engine radiator (10) and motor (18) introduces.
10. Kühlsystem nach zumindest einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zur Kopplung des Abzweigs (35, 36) an die Kühlmittelzuleitung (30) ein Thermostatventil (16) vorgesehen ist.10. Cooling system according to at least one of the preceding claims, characterized in that for coupling the branch (35, 36) to the coolant supply line (30), a thermostatic valve (16) is provided.
11. Kühlsystem nach Anspruch 9 oder 10, dadurch gekennzeichnet, dass in dem Abzweig (35) ein Ventil (12) vorgesehen ist, das öffnet, wenn das Ventil (14) in der Rückleitung (37) schließt.11. Cooling system according to claim 9 or 10, characterized in that in the branch (35) a valve (12) is provided, which opens when the valve (14) in the return line (37) closes.
12. Kühlsystem nach zumindest einem der Ansprüche 9 bis 11, dadurch gekennzeichnet, dass im Abzweig (35) stromabwärts des Ventils (12) ein Rückschlagventil (15) vorgesehen ist.12. Cooling system according to at least one of claims 9 to 11, characterized in that in the branch (35) downstream of the valve (12) a check valve (15) is provided.
13. Kühlsystem nach zumindest einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zwischen dem Motorkühler (10) und der Kühlkomponente (11) im zweiten Kühlkreislauf (40) ein zusätzlicher Kühler vorgesehen ist.13. Cooling system according to at least one of the preceding claims, characterized in that between the engine radiator (10) and the cooling component (11) in the second cooling circuit (40), an additional radiator is provided.
14. Verfahren zum Betreiben eines Kühlsystem für ein Fahrzeug mit einem Motor (18), einem Motorkühler (10) und einem Motorkühlkreislauf (39), wobei ein zweiter Kühlkreislauf (40) mit mindestens einer Kühlkomponente (11) an den Motorkühler (10) angekoppelt wird und mit einer Abzweigleitung (28) von einer Kühlmittelzuleitung (29) des Motorkühlkreislaufs (39) und mit einer Rückleitung (34, 37, 38) von der Kühlkomponente (11) mit einem Kühlmittelrücklauf (31) des Motorkühlkreislaufs (39) verbunden wird, dadurch gekennzeichnet, dass der zweite Kühlkreislauf (40) abhängig von Betriebsbedingungen des Motors (10) aus- 14. A method for operating a cooling system for a vehicle with an engine (18), an engine radiator (10) and an engine cooling circuit (39), wherein a second cooling circuit (40) with at least one cooling component (11) coupled to the engine radiator (10) is connected to a branch line (28) from a coolant supply line (29) of the engine cooling circuit (39) and with a return line (34, 37, 38) from the cooling component (11) to a coolant return line (31) of the engine cooling circuit (39); characterized in that the second cooling circuit (40) depends on operating conditions of the engine (10)
. - O 20, - O 20
gangsseitig wahlweise an den Kühlmittelrücklauf (31) oder an eine Kühlmittelzuleitung (30) gekoppelt wird.on the output side is selectively coupled to the coolant return (31) or to a coolant supply line (30).
15. Verfahren nach Anspruch 14, dadurch gekennzeichnet, dass ein Kühlmittelvolumenstrom im zweiten Kühlkreislauf (40) abhängig von einer vorgegebenen Menge eines in der Kühlkomponente (11) zu kühlenden Mediums eingestellt wird. 15. The method according to claim 14, characterized in that a coolant volume flow in the second cooling circuit (40) is set depending on a predetermined amount of a in the cooling component (11) to be cooled medium.
EP06776478A 2005-07-28 2006-07-27 Cooling system for a vehicle, and method for the operation of a cooling system Ceased EP1913243B1 (en)

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DE102006020951A DE102006020951A1 (en) 2005-07-28 2006-05-05 Cooling system for a vehicle and method for operating a cooling system
PCT/EP2006/007473 WO2007012493A1 (en) 2005-07-28 2006-07-27 Cooling system for a vehicle, and method for the operation of a cooling system

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US8136488B2 (en) 2012-03-20
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US20090229542A1 (en) 2009-09-17
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CN101184910A (en) 2008-05-21
DE102006020951A1 (en) 2007-02-01

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