EP2307678B1 - Cooling device for a motor vehicle internal combustion engine, and method for operating the same - Google Patents

Cooling device for a motor vehicle internal combustion engine, and method for operating the same Download PDF

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Publication number
EP2307678B1
EP2307678B1 EP09776737.0A EP09776737A EP2307678B1 EP 2307678 B1 EP2307678 B1 EP 2307678B1 EP 09776737 A EP09776737 A EP 09776737A EP 2307678 B1 EP2307678 B1 EP 2307678B1
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EP
European Patent Office
Prior art keywords
coolant
combustion engine
heat exchanger
internal combustion
cooling
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EP09776737.0A
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German (de)
French (fr)
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EP2307678A1 (en
Inventor
Werner Mietschnig
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Publication of EP2307678A1 publication Critical patent/EP2307678A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/165—Controlling of coolant flow the coolant being liquid by thermostatic control characterised by systems with two or more loops
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/20—Cooling circuits not specific to a single part of engine or machine
    • 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

Definitions

  • the invention relates to a device for cooling a motor vehicle internal combustion engine in a cooling circuit with a coolant pump, an internal combustion engine housing, an exhaust gas recirculation heat exchanger, a coolant thermostatic valve and a coolant heat exchanger and a method for operating such a cooling device.
  • the coolant is circulated by means of the coolant pump and flows through in a starting phase or at low load of the internal combustion engine not only the exhaust gas recirculation heat exchanger, but also the engine housing.
  • the coolant thermostatic valve switches on the coolant heat exchanger. This prevents excessive thermal load on the internal combustion engine, especially at high load.
  • a coolant flow of the internal combustion engine is often not even necessary in the starting phase or at low load of the internal combustion engine with respect to their thermal load and the heat input from the internal combustion engine into the coolant contributes to a reduced cooling capacity in the exhaust gas recirculation heat exchanger.
  • a device for cooling a motor vehicle internal combustion engine in a cooling circuit with a coolant pump, an engine housing, a Exhaust gas recirculation heat exchanger and a coolant heat exchanger.
  • the coolant pump, the exhaust gas recirculation heat exchanger and the coolant heat exchanger are comprised by a first coolant subcircuit.
  • the coolant pump, the engine housing and the coolant heat exchanger are comprised of a second coolant subcircuit.
  • the device has a first thermostatic valve for opening or closing the second coolant subcircuit.
  • the coolant heat exchanger is comprised of both the first and the second cooling circuit, is thus always flowed through and regardless of the coolant distribution between the first and second cooling circuit.
  • the invention is therefore based on the object to provide an aforementioned device for cooling a motor vehicle internal combustion engine, in which a cooling of the internal combustion engine takes place only if this is necessary in particular from a thermal point of view and otherwise to keep a heat input into the coolant low in order to achieve the most efficient possible cooling of the recirculated exhaust gas by means of the coolant-flowed exhaust gas recirculation heat exchanger.
  • a device for cooling a motor vehicle internal combustion engine having the features of claim 1.
  • a separate control of the flow, in particular of the engine housing on the one hand and on the other hand, in particular the exhaust gas recirculation heat exchanger allows, so that a flow through the engine housing and thus a heat input into the coolant can be substantially prevented and still a flow through the exhaust gas recirculation heat exchanger is possible.
  • a flow through the second coolant subcircuit, in particular of the internal combustion engine housing can be essentially prevented by the first shut-off valve.
  • the coolant thermostat valve controls a coolant flow of the coolant heat exchanger, so that cooling of the coolant takes place only if this is due in particular thermal load of the internal combustion engine and / or the requirements for the cooling of the recirculated exhaust gas is required.
  • the invention is achieved by a method having the features of claim 3, wherein at a temperature of the internal combustion engine below a predetermined first value, a first shut-off valve is closed and a coolant circulation in the second coolant subcircuit is substantially prevented, so that the coolant substantially in first coolant subcircuit rotates. In a warm-up phase of the internal combustion engine so rapid heating can be achieved with simultaneous active cooling of the recirculated exhaust gas.
  • a cooling device with a heating heat exchanger this is comprised of a third coolant subcircuit and a second shutoff valve is provided for opening or closing the third coolant subcircuit.
  • the heating heat exchanger the need for the first and / or second coolant subcircuit switched on or switched off.
  • a preferred embodiment of the method according to the invention is characterized in that at a temperature of the internal combustion engine above a predetermined first value, the first shut-off valve is opened and the coolant circulates in both the first and in the second coolant subcircuit. In this operating state, the cooling of the internal combustion engine has priority over the requirement to cool the recirculated exhaust gas.
  • the coolant thermostatic valve prevents a flow through the coolant heat exchanger and enables it at a temperature of the internal combustion engine above the predetermined second value.
  • the regulation of the coolant thermostatic valve is basically independent of the predetermined first value, after which the first shut-off valve is regulated, but the first and second predetermined values may also be at least approximately equal.
  • the second shut-off valve opens or closes depending on the temperature of the internal combustion engine, the outside temperature, a driver-side Schuanograph and / or other parameters, so that a coolant circulation in the third coolant subcircuit is substantially prevented or the coolant in both the first and / or second as well circulates in the third coolant subcircuit.
  • FIG. 1 shows in part a device for cooling a motor vehicle internal combustion engine with a first coolant subcircuit 100 with coolant pump 102 and exhaust gas recirculation heat exchanger 104 and a second coolant subcircuit 200 with coolant pump 102 and engine housing 209.
  • a check valve 204 is provided for opening or closing the second refrigerant subcircuit 200.
  • FIG. 2 shows a device for cooling a motor vehicle internal combustion engine in a cooling circuit in an operating state in which a cooling of the internal combustion engine is not required
  • FIG. 3 is this Device in an operating state in which a cooling of the internal combustion engine and in FIG. 4 in an operating condition in which additionally cooling of the coolant is required.
  • the figures show a motor vehicle internal combustion engine with cooling circuit.
  • the motor vehicle is preferably a truck or a car
  • the internal combustion engine is in particular a hydrocarbon-powered reciprocating internal combustion engine
  • the coolant is expediently water-based with additives for improving the anticorrosion effect and lowering the freezing point.
  • the internal combustion engine includes an engine housing with crankcase 208 and cylinder head 210 having channels for coolant flow. For coolant inflow and outflow several coolant inlets and outlets are provided on the engine casing.
  • a coolant pump 102 serves to circulate the coolant.
  • a first coolant inlet is provided in the region of the crankcase 208 on the coolant pump side.
  • a first coolant outlet is also provided in the region of the crankcase 208 and leads to an exhaust gas recirculation heat exchanger 104.
  • the exhaust gas recirculation heat exchanger 104 is on the one hand coolant and on the other hand exhaust gas flows through, so that between the coolant and exhaust gas for cooling the exhaust gas heat transfer can take place. Downstream of the exhaust gas recirculation heat exchanger 104, a coolant thermostatic valve 106 is arranged in the cooling circuit, starting from which a coolant line leads again to the coolant pump 102.
  • a second coolant outlet is provided, starting from which a coolant line branch via a coolant surge tank 214 to the coolant pump 102 and a another coolant line branch via a coolant heat exchanger 216 to the coolant thermostatic valve 106 leads.
  • the coolant heat exchanger 216 is on the one hand coolant and on the other hand flows through air, so that between the coolant and air for cooling the coolant heat transfer can take place.
  • a third coolant outlet in the region of the crankcase 208 is connected via an oil cooler 212 to a second coolant inlet in the cylinder head region.
  • the oil cooler 212 on the one hand coolant and on the other hand oil flows through it, so that between the coolant and oil for cooling the oil heat transfer can take place.
  • the oil is used for example for lubrication and cooling of the internal combustion engine.
  • Downstream of the exhaust gas recirculation heat exchanger 104 branches off a coolant line, which initially leads to a first shut-off valve 402 and, starting there, branching out, on the one hand into the coolant line coming from the second coolant outlet in the region of the cylinder head 210 and on the other a second shut-off valve 404 and a heating heat exchanger 318 leads and opens into the line leading to the coolant pump 102 line.
  • the heating heat exchanger 318 on the one hand flows through the coolant and, on the other hand, flows through a heating means for heating the motor vehicle interior, so that a heat transfer can take place between the coolant and the heating heating means.
  • a further pump 320 is arranged in the line leading to the heating heat exchanger 318.
  • the shut-off valves 402 and 404 are presently designed together as a 3/2-way valve.
  • FIG. 1 showing an operating condition in which cooling of the internal combustion engine is not required, but the recirculated exhaust gas is cooled
  • a first coolant subcircuit 100 is shown in solid line, which are remaining portions of the coolant circuit shown dotted.
  • FIG. 2 showing an operating state in which cooling of the internal combustion engine is required, in addition to the first, shown in solid line coolant subcircuit 100, a second refrigerant subcircuit 200 shown in dashed line.
  • FIG. 3 dotted a third coolant subcircuit 300 is shown.
  • the first coolant subcycle 100 includes the coolant pump 102, the exhaust gas recirculation heat exchanger 104, and the coolant thermostat valve 106
  • the second coolant subcycle 200 includes the coolant pump 102, the engine housing 208, 210, and the coolant thermostatic valve 106th
  • the first shut-off valve 402 is closed, so that a coolant circulation in the second coolant subcircuit 200 is substantially prevented.
  • the coolant is therefore conveyed in the first coolant subcircuit 100 from the coolant pump 102 to the crankcase 208, but flows through this only very short path to flow to the exhaust gas recirculation heat exchanger 104 without significant heat absorption. Further, the coolant flows to the coolant thermostatic valve 106 and back to the coolant pump 102. Coolant flow through the crankcase 208, the cylinder head 210, and the coolant heat exchanger 216 is inhibited. Also prevented is a flow through the heating heat exchanger 318 by the second shut-off valve 404 is closed.
  • the first shut-off valve 402 is opened, so that the coolant circulates in both the first coolant subcircuit 100 and in the second coolant subcircuit 200.
  • a flow through the Exhaust gas recirculation heat exchanger 104 in the first coolant subcircuit 100 takes place as described above.
  • the second coolant subcircuit 200 is flowed through. It locks according to FIG. 2 the coolant thermostatic valve 106 flows through the coolant heat exchanger 216, so that the coolant flows in from the cylinder head 210 between the shut-off valves 404 and 402 and subsequently flows through the thermostatic valve 106 to the coolant pump 102.
  • the thermostatic valve 106 allows flow through the coolant heat exchanger 216, so that the coolant from the cylinder head 210 flows through the coolant heat exchanger 216 and subsequently through the thermostatic valve 106 for Coolant pump 102 flows.
  • the second shut-off valve 404 By means of the second shut-off valve 404, a flow through the heating heat exchanger 318 is controlled.
  • MVEG cycle European driving cycle for emission and consumption measurements on chassis dynamometers

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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)
  • Air-Conditioning For Vehicles (AREA)

Description

Die Erfindung betrifft eine Einrichtung zur Kühlung einer Kraftfahrzeug-Brennkraftmaschine in einem Kühl-Kreislauf mit einer Kühlmittel-Pumpe, einem Brennkraftmaschinen-Gehäuse, einem Abgasrückführ-Wärmetauscher, einem Kühlmittel-Thermostatventil und einem Kühlmittel-Wärmetauscher sowie ein Verfahren zum Betreiben einer derartigen Kühleinrichtung.The invention relates to a device for cooling a motor vehicle internal combustion engine in a cooling circuit with a coolant pump, an internal combustion engine housing, an exhaust gas recirculation heat exchanger, a coolant thermostatic valve and a coolant heat exchanger and a method for operating such a cooling device.

Bei brennkraftmaschinengetriebenen Kraftfahrzeugen mit einer derartigen bekannten Einrichtung zur Kühlung der Brennkraftmaschine wird das Kühlmittel mittels der Kühlmittel-Pumpe Umgewälzt und durchströmt auch in einer Startphase oder bei geringer Last der Brennkraftmaschine nicht nur den Abgasrückführ-Wärmetauscher, sondern auch das Brennkraftmaschinen-Gehäuse. Bei Erreichen einer vorgegebenen Grenztemperatur schaltet das Kühlmittel-Thermostatventil den Kühlmittel-Wärmetauscher zu. Damit wird eine übermäßige thermische Belastung der Brennkraftmaschine insbesondere bei hoher Last verhindert.In internal combustion engine-powered vehicles with such a known device for cooling the internal combustion engine, the coolant is circulated by means of the coolant pump and flows through in a starting phase or at low load of the internal combustion engine not only the exhaust gas recirculation heat exchanger, but also the engine housing. When a predetermined limit temperature is reached, the coolant thermostatic valve switches on the coolant heat exchanger. This prevents excessive thermal load on the internal combustion engine, especially at high load.

Allerdings ist eine Kühlmitteldurchströmung der Brennkraftmaschine bereits in der Startphase oder bei geringer Last der Brennkraftmaschine hinsichtlich ihrer thermischen Belastung oft gar nicht erforderlich und die von der Brennkraftmaschine in das Kühlmittel eingetrage Wärme trägt zu einer verringerten Kühlleistung im Abgasrückführ-Wärmetauscher bei.However, a coolant flow of the internal combustion engine is often not even necessary in the starting phase or at low load of the internal combustion engine with respect to their thermal load and the heat input from the internal combustion engine into the coolant contributes to a reduced cooling capacity in the exhaust gas recirculation heat exchanger.

Aus der FR 2 897 392 A1 ist eine Einrichtung zur Kühlung einer Kraftfahrzeug-Brennkraftmaschine in einem Kühl-Kreislauf bekannt, mit einer Kühlmittel-Pumpe, einem Brennkraftmaschinen-Gehäuse, einem Abgasrückführ-Wärmetauscher und einem Kühlmittel-Wärmetauscher. Die die Kühlmittel-Pumpe, der Abgasrückführ-Wärmetauscher und der Kühlmittel-Wärmetauscher sind von einem ersten Kühlmittel-Teilkreislauf umfasst. Die Kühlmittel-Pumpe, das Brennkraftmaschinen-Gehäuse und der Kühlmittel-Wärmetauscher sind von einem zweiten Kühlmittel-Teilkreislauf umfasst. Ferner weist die Einrichtung ein erstes Thermostatventil zum Öffnen oder Schließen des zweiten Kühlmittel-Teilkreislaufs auf. Bei dieser Einrichtung ist der Kühlmittel-Wärmetauscher sowohl vom ersten als auch vom zweiten Kühl-Kreislauf umfasst, wird somit immer durchströmt und zwar unabhängig von der Kühlmittelverteilung zwischen erstem und zweitem KühlKreislauf.From the FR 2 897 392 A1 a device for cooling a motor vehicle internal combustion engine in a cooling circuit is known, with a coolant pump, an engine housing, a Exhaust gas recirculation heat exchanger and a coolant heat exchanger. The coolant pump, the exhaust gas recirculation heat exchanger and the coolant heat exchanger are comprised by a first coolant subcircuit. The coolant pump, the engine housing and the coolant heat exchanger are comprised of a second coolant subcircuit. Furthermore, the device has a first thermostatic valve for opening or closing the second coolant subcircuit. In this device, the coolant heat exchanger is comprised of both the first and the second cooling circuit, is thus always flowed through and regardless of the coolant distribution between the first and second cooling circuit.

Der Erfindung liegt daher die Aufgabe zugrunde, eine eingangs genannte Einrichtung zur Kühlung einer Kraftfahrzeug-Brennkraftmaschine bereit zu stellen, bei der eine Kühlung der Brennkraftmaschine nur dann erfolgt, wenn dies insbesondere unter thermischen Gesichtspunkten erforderlich ist und ansonsten einen Wärmeeintrag in das Kühlmittel gering zu halten, um eine möglichst effiziente Kühlung des rückgeführten Abgases mittels des kühlmitteldurchströmten Abgasrückführ-Wärmetauschers zu erzielen.The invention is therefore based on the object to provide an aforementioned device for cooling a motor vehicle internal combustion engine, in which a cooling of the internal combustion engine takes place only if this is necessary in particular from a thermal point of view and otherwise to keep a heat input into the coolant low in order to achieve the most efficient possible cooling of the recirculated exhaust gas by means of the coolant-flowed exhaust gas recirculation heat exchanger.

Die Lösung der Aufgabe erfolgt mit einer Einrichtung zur Kühlung einer Kraftfahrzeug-Brennkraftmaschine mit den Merkmalen des Anspruchs 1. Dadurch ist eine gesonderte Regelung der Durchströmung insbesondere des Brennkraftmaschinen-Gehäuses einerseits und andererseits insbesondere des Abgasrückführ-Wärmetauschers ermöglicht, sodass eine Durchströmung des Brennkraftmaschinen-Gehäuses und damit ein Wärmeeintrag in das Kühlmittel im Wesentlichen unterbunden werden kann und dennoch eine Durchströmung des Abgasrückführ-Wärmetauscher möglich ist. Außerdem kann durch das erste Absperrventil eine Durchströmung des zweiten Kühlmittel-Teilkreislaufs, insbesondere des Brennkraftmaschinen-Gehäuses, im Wesentlichen unterbunden werden. Als zweckmäßig wird es angesehen, wenn bei einer Kühleinrichtung mit einem Kühlmittel-Wärmetauscher im zweiten Kühlmittel-Teilkreislauf und einem Kühlmittel-Thermostatventil das Kühlmittel-Thermostatventil eine Kühlmitteldurchströmung des Kühlmittel-Wärmetauschers regelt, sodass eine Kühlung des Kühlmittels nur dann erfolgt, wenn dies insbesondere aufgrund der thermischen Belastung der Brennkraftmaschine und/oder der Anforderungen an die Kühlung des rückgeführten Abgases erforderlich ist.The object is achieved with a device for cooling a motor vehicle internal combustion engine having the features of claim 1. Thus, a separate control of the flow, in particular of the engine housing on the one hand and on the other hand, in particular the exhaust gas recirculation heat exchanger allows, so that a flow through the engine housing and thus a heat input into the coolant can be substantially prevented and still a flow through the exhaust gas recirculation heat exchanger is possible. In addition, a flow through the second coolant subcircuit, in particular of the internal combustion engine housing, can be essentially prevented by the first shut-off valve. When It is expedient if it is at a cooling device with a coolant heat exchanger in the second coolant subcircuit and a coolant thermostatic valve, the coolant thermostat valve controls a coolant flow of the coolant heat exchanger, so that cooling of the coolant takes place only if this is due in particular thermal load of the internal combustion engine and / or the requirements for the cooling of the recirculated exhaust gas is required.

Außerdem wird die Erfindung mit einem Verfahren mit den Merkmalen des Anspruchs 3 gelöst, indem bei einer Temperatur der Brennkraftmaschine unterhalb eines vorbestimmten ersten Wertes ein erstes Absperrventil geschlossen ist und ein Kühlmittelumlauf im zweiten Kühlmittel-Teilkreislauf im Wesentlichen unterbunden ist, sodass das Kühlmittel im Wesentlichen im ersten Kühlmittel-Teilkreislauf umläuft. In einer Warmlauf-Phase der Brennkraftmaschine kann so eine rasche Erwärmung erreicht werden bei gleichzeitig aktiver Kühlung des rückgeführten Abgases.In addition, the invention is achieved by a method having the features of claim 3, wherein at a temperature of the internal combustion engine below a predetermined first value, a first shut-off valve is closed and a coolant circulation in the second coolant subcircuit is substantially prevented, so that the coolant substantially in first coolant subcircuit rotates. In a warm-up phase of the internal combustion engine so rapid heating can be achieved with simultaneous active cooling of the recirculated exhaust gas.

Besonders bevorzugte Ausführungen und Weiterbildungen der erfindungsgemäßen Kühleinrichtung sowie des erfindungsgemäßen Verfahrens sind Gegenstand der Unteransprüche.Particularly preferred embodiments and developments of the cooling device according to the invention and the method according to the invention are the subject of the dependent claims.

Vorzugsweise ist bei einer Kühleinrichtung mit einem Heizungs-Wärmetauscher dieser von einem dritten Kühlmittel-Teilkreislauf umfasst und es ist ein zweites Absperrventil zum Öffnen oder Schließen des dritten Kühlmittel-Teilkreislaufs vorgesehen. Damit kann der Heizungs-Wärmetauscher dem ersten und/oder zweiten Kühlmittel-Teilkreislauf bedarfsweise zugeschaltet oder davon abgeschaltet werden.Preferably, in a cooling device with a heating heat exchanger, this is comprised of a third coolant subcircuit and a second shutoff valve is provided for opening or closing the third coolant subcircuit. Thus, the heating heat exchanger, the need for the first and / or second coolant subcircuit switched on or switched off.

Eine bevorzugte Weiterbildung des erfindungsgemäßen Verfahrens zeichnet sich dadurch aus, dass bei einer Temperatur der Brennkraftmaschine oberhalb eines vorbestimmten ersten Wertes das erste Absperrventil geöffnet ist und das Kühlmittel sowohl im ersten und als auch im zweiten Kühlmittel-Teilkreislauf umläuft. Bei diesem Betriebszustand hat die Kühlung der Brennkraftmaschine Vorrang vor der Anforderung, das rückgeführte Abgas zu kühlen.A preferred embodiment of the method according to the invention is characterized in that at a temperature of the internal combustion engine above a predetermined first value, the first shut-off valve is opened and the coolant circulates in both the first and in the second coolant subcircuit. In this operating state, the cooling of the internal combustion engine has priority over the requirement to cool the recirculated exhaust gas.

Sehr vorteilhaft ist es, wenn das Kühlmittel-Thermostatventil bei einer Temperatur der Brennkraftmaschine unterhalb eines vorbestimmten zweiten Wertes eine Durchströmung des Kühlmittel-Wärmetauschers unterbindet und diese bei einer Temperatur der Brennkraftmaschine oberhalb des vorbestimmten zweiten Wertes ermöglicht. Damit ist die Regelung des Kühlmittel-Thermostatventils grundsätzlich von dem vorbestimmten ersten Wert, nach dem das erste Absperrventil geregelt ist, unabhängig, jedoch können der erste und der zweite vorbestimmte Wert auch zumindest annähernd gleich sein.It is very advantageous if, at a temperature of the internal combustion engine below a predetermined second value, the coolant thermostatic valve prevents a flow through the coolant heat exchanger and enables it at a temperature of the internal combustion engine above the predetermined second value. Thus, the regulation of the coolant thermostatic valve is basically independent of the predetermined first value, after which the first shut-off valve is regulated, but the first and second predetermined values may also be at least approximately equal.

Zweckmäßigerweise öffnet oder schließt das zweite Absperrventil abhängig von der Temperatur der Brennkraftmaschine, der Außentemperatur, einer fahrerseitigen Heizanforderung und/oder anderer Parameter, sodass ein Kühlmittelumlauf im dritten Kühlmittel-Teilkreislauf im Wesentlichen unterbunden ist oder das Kühlmittel sowohl im ersten und/oder zweiten als auch im dritten Kühlmittel-Teilkreislauf umläuft.Conveniently, the second shut-off valve opens or closes depending on the temperature of the internal combustion engine, the outside temperature, a driver-side Heizanforderung and / or other parameters, so that a coolant circulation in the third coolant subcircuit is substantially prevented or the coolant in both the first and / or second as well circulates in the third coolant subcircuit.

Nachfolgen wird ein besonders zu bevorzugendes Ausführungsbeispiel der Erfindung unter Bezugnahme auf Figuren näher erläutert, dabei zeigen schematisch und beispielhaft

Figur 1
eine Einrichtung zur Kühlung einer Kraftfahrzeug-Brennkraft maschine mit einem ersten Kühlmittel-Teilkreislauf mit Kühlmittel-Pumpe und Abgasrückführ-Wärmetauscher sowie einem zweiten Kühlmittel-Teilkreislauf mit Kühlmittel-Pumpe und Brennkraftmaschinen-Gehäuse,
Figur 2
eine Einrichtung zur Kühlung einer KraftfahrzeugBrennkraftmaschine in einem Kühl-Kreislauf in einem Betriebszustand, in dem eine Kühlung der Brennkraftmaschine nicht erforderlich ist,
Figur 3
eine Einrichtung zur Kühlung einer Kraftfahrzeug-Brennkraftmaschine in einem Kühl-Kreislauf in einem Betriebszustand, in dem eine Kühlung der Brennkraftmaschine erforderlich ist und
Figur 4
eine Einrichtung zur Kühlung einer Kraftfahrzeug-Brennkraftmaschine in einem Kühl-Kreislauf in einem Betriebszustand, in dem eine Kühlung der Brennkraftmaschine und zusätzlich eine Kühlung des Kühlmittels erforderlich ist.
A particularly preferred embodiment of the invention will be explained in more detail with reference to figures, in which show schematically and by way of example
FIG. 1
a device for cooling a motor vehicle internal combustion engine with a first coolant subcircuit with coolant pump and exhaust gas recirculation heat exchanger and a second coolant subcircuit with coolant pump and engine housing,
FIG. 2
a device for cooling a motor vehicle internal combustion engine in a cooling circuit in an operating state in which cooling of the internal combustion engine is not required,
FIG. 3
a device for cooling a motor vehicle internal combustion engine in a cooling circuit in an operating state in which cooling of the internal combustion engine is required and
FIG. 4
a device for cooling a motor vehicle internal combustion engine in a cooling circuit in an operating state in which cooling of the internal combustion engine and additionally cooling of the coolant is required.

Figur 1 zeigt auszugsweise eine Einrichtung zur Kühlung einer Kraftfahrzeug-Brennkraftmaschine mit einem ersten Kühlmittel-Teilkreislauf 100 mit Kühlmittel-Pumpe 102 und Abgasrückführ-Wärmetauscher 104 sowie einem zweiten Kühlmittel-Teilkreislauf 200 mit Kühlmittel-Pumpe 102 und Brennkraftmaschinen-Gehäuse 209. Im zweiten Kühlmittel-Teilkreislauf 200 ist ein Absperrventil 204 zum Öffnen oder Schließen des zweiten Kühlmittel-Teilkreislaufs 200 vorgesehen. Figur 1 verdeutlicht die allgemeine erfinderische Idee, die in den Figuren 2-4 anhand spezifischer Ausführungen erläutert wird, deren nachfolgende Beschreibung, soweit zutreffend, auch auf Figur 1 zu lesen ist. FIG. 1 shows in part a device for cooling a motor vehicle internal combustion engine with a first coolant subcircuit 100 with coolant pump 102 and exhaust gas recirculation heat exchanger 104 and a second coolant subcircuit 200 with coolant pump 102 and engine housing 209. In the second coolant subcircuit 200, a check valve 204 is provided for opening or closing the second refrigerant subcircuit 200. FIG. 1 clarifies the general inventive idea, which in the Figures 2-4 is explained with reference to specific embodiments, the following description, where applicable, also on FIG. 1 to read.

Figur 2 zeigt eine Einrichtung zur Kühlung einer Kraftfahrzeug-Brennkraftmaschine in einem Kühl-Kreislauf in einem Betriebszustand, in dem eine Kühlung der Brennkraftmaschine nicht erforderlich ist, in Figur 3 ist diese Einrichtung in einem Betriebszustand, in dem eine Kühlung der Brennkraftmaschine und in Figur 4 in einem Betriebszustand, in dem zusätzlich eine Kühlung des Kühlmittels erforderlich ist, dargestellt. FIG. 2 shows a device for cooling a motor vehicle internal combustion engine in a cooling circuit in an operating state in which a cooling of the internal combustion engine is not required, in FIG. 3 is this Device in an operating state in which a cooling of the internal combustion engine and in FIG. 4 in an operating condition in which additionally cooling of the coolant is required.

Die Figuren zeigen eine Kraftfahrzeug-Brennkraftmaschine mit KühlKreislauf. Das Kraftfahrzeug ist vorzugsweise ein LKW oder PKW, die Brennkraftmaschine ist insbesondere eine kohlenwasserstoffbetriebene Hubkolben-Brennkraftmaschine und das Kühlmittel ist zweckmäßigerweise wasserbasiert mit Additiven zur Verbesserung der Korrosionsschutzwirkung und Senkung des Gefrierpunktes.The figures show a motor vehicle internal combustion engine with cooling circuit. The motor vehicle is preferably a truck or a car, the internal combustion engine is in particular a hydrocarbon-powered reciprocating internal combustion engine and the coolant is expediently water-based with additives for improving the anticorrosion effect and lowering the freezing point.

Die Brennkraftmaschine umfasst ein Brennkraftmaschinen-Gehäuse mit Kurbelgehäuse 208 und Zylinderkopf 210, das Kanäle zur Kühlmitteldurchströmung aufweist. Zur Kühlmittel Zu- und Abströmung sind am Brennkraftmaschinen-Gehäuse mehrere Kühlmittel-Ein- und Auslässe vorgesehen. Eine Kühlmittel-Pumpe 102 dient zur Umwälzung des Kühlmittels. Vorliegend ist im Bereich des Kurbelgehäuses 208 kühlmittelpumpenseitig ein erster Kühlmittel-Einlass vorgesehen. Ein erster Kühlmittel-Auslass ist ebenfalls im Bereich des Kurbelgehäuses 208 vorgesehen und führt zu einem Abgasrückführ-Wärmetauscher 104.The internal combustion engine includes an engine housing with crankcase 208 and cylinder head 210 having channels for coolant flow. For coolant inflow and outflow several coolant inlets and outlets are provided on the engine casing. A coolant pump 102 serves to circulate the coolant. In the present case, a first coolant inlet is provided in the region of the crankcase 208 on the coolant pump side. A first coolant outlet is also provided in the region of the crankcase 208 and leads to an exhaust gas recirculation heat exchanger 104.

Der Abgasrückführ-Wärmetauscher 104 ist einerseits kühlmittel- und andererseits abgasdurchströmt, sodass zwischen Kühlmittel und Abgas zur Kühlung des Abgases ein Wärmeübergang stattfinden kann. Stromab des Abgasrückführ-Wärmetauschers 104 ist im Kühlkreislauf ein Kühlmittel-Thermostatventil 106 angeordnet, von dem ausgehend eine Kühlmittel-Leitung wieder zur Kühlmittel-Pumpe 102 führt.The exhaust gas recirculation heat exchanger 104 is on the one hand coolant and on the other hand exhaust gas flows through, so that between the coolant and exhaust gas for cooling the exhaust gas heat transfer can take place. Downstream of the exhaust gas recirculation heat exchanger 104, a coolant thermostatic valve 106 is arranged in the cooling circuit, starting from which a coolant line leads again to the coolant pump 102.

Im Bereich des Zylinderkopfes 210 ist ein zweiter Kühlmittel-Auslass vorgesehen, von dem ausgehend ein Kühlmittel-Leitungszweig über einen Kühlmittel-Ausgleichsbehälter 214 zur Kühlmittel-Pumpe 102 und ein anderer Kühlmittel-Leitungszweig über einen Kühlmittel-Wärmetauscher 216 zum Kühlmittel-Thermostatventil 106 führt. Der Kühlmittel-Wärmetauscher 216 ist einerseits kühlmittel- und andererseits luftdurchströmt, sodass zwischen Kühlmittel und Luft zur Kühlung des Kühlmittels ein Wärmeübergang stattfinden kann.In the region of the cylinder head 210, a second coolant outlet is provided, starting from which a coolant line branch via a coolant surge tank 214 to the coolant pump 102 and a another coolant line branch via a coolant heat exchanger 216 to the coolant thermostatic valve 106 leads. The coolant heat exchanger 216 is on the one hand coolant and on the other hand flows through air, so that between the coolant and air for cooling the coolant heat transfer can take place.

Ein dritter Kühlmittel-Auslass im Bereich des Kurbelgehäuses 208 ist über einen Ölkühler 212 mit einem zweiten Kühlmittel-Einlass im Zylinderkopfbereich verbunden. Der Ölkühler 212 ist einerseits kühlmittel- und andererseits öldurchströmt, sodass zwischen Kühlmittel und Öl zur Kühlung des Öls ein Wärmeübergang stattfinden kann. Das Öl dient beispielsweise zur Schmierung und Kühlung der Brennkraftmaschine.A third coolant outlet in the region of the crankcase 208 is connected via an oil cooler 212 to a second coolant inlet in the cylinder head region. The oil cooler 212 on the one hand coolant and on the other hand oil flows through it, so that between the coolant and oil for cooling the oil heat transfer can take place. The oil is used for example for lubrication and cooling of the internal combustion engine.

Stromab des Abgasrückführ-Wärmetauschers 104 zweigt eine Kühlmittel-Leitung ab, die zunächst zu einem ersten Absperrventil 402 führt und von dort ausgehend, sich verzweigend, einerseits in die vom zweiten Kühlmittel-Auslass im Bereich des Zylinderkopfes 210 kommenden Kühlmittel-Leitung mündet und andererseits über ein zweites Absperrventil 404 und einen Heizungs-Wärmetauscher 318 führt und in die zur Kühlmittel-Pumpe 102 führende Leitung mündet. Der Heizungs-Wärmetauscher 318 ist einerseits kühlmitteldurchströmt und andererseits von einem Heizmittel zur Heizung des Kraftfahrzeug-Innenraumes durchströmt, sodass zwischen Kühlmittel und Heizungs-Heizmittel ein Wärmeübergang stattfinden kann. In der zum Heizungs-Wärmetauscher 318 führenden Leitung ist eine weitere Pumpe 320 angeordnet. Die Absperrventile 402 und 404 sind vorliegend gemeinsam als 3/2-Wege-Ventil ausgeführt.Downstream of the exhaust gas recirculation heat exchanger 104 branches off a coolant line, which initially leads to a first shut-off valve 402 and, starting there, branching out, on the one hand into the coolant line coming from the second coolant outlet in the region of the cylinder head 210 and on the other a second shut-off valve 404 and a heating heat exchanger 318 leads and opens into the line leading to the coolant pump 102 line. The heating heat exchanger 318 on the one hand flows through the coolant and, on the other hand, flows through a heating means for heating the motor vehicle interior, so that a heat transfer can take place between the coolant and the heating heating means. In the line leading to the heating heat exchanger 318, a further pump 320 is arranged. The shut-off valves 402 and 404 are presently designed together as a 3/2-way valve.

In Figur 1, die einen Betriebszustand zeigt, in dem eine Kühlung der Brennkraftmaschine nicht erforderlich ist, das rückgeführte Abgas jedoch gekühlt wird, ist ein erster Kühlmittel-Teilkreislauf 100 mit durchgezogener Linie dargestellt, die übrigen Bereiche des Kühlmittel-Kreislaufs sind punktiert dargestellt. In Figur 2, die einen Betriebszustand zeigt, in dem eine Kühlung der Brennkraftmaschine erforderlich ist, ist neben dem ersten, mit durchgezogener Linie dargestellten Kühlmittel-Teilkreislauf 100 ein zweiter Kühlmittel-Teilkreislauf 200 mit gestrichelter Linie dargestellt. In Figur 3 ist punktiert ein dritter Kühlmittel-Teilkreislauf 300 dargestellt.In FIG. 1 showing an operating condition in which cooling of the internal combustion engine is not required, but the recirculated exhaust gas is cooled, a first coolant subcircuit 100 is shown in solid line, which are remaining portions of the coolant circuit shown dotted. In FIG. 2 showing an operating state in which cooling of the internal combustion engine is required, in addition to the first, shown in solid line coolant subcircuit 100, a second refrigerant subcircuit 200 shown in dashed line. In FIG. 3 dotted a third coolant subcircuit 300 is shown.

Der erste Kühlmittel-Teilkreislauf 100 umfasst die Kühlmittel-Pumpe 102, den Abgasrückführ-Wärmetauscher 104 und das Kühlmittel-Thermostatventil 106, der zweite Kühlmittel-Teilkreislauf 200 umfasst die Kühlmittel-Pumpe 102, das Brennkraftmaschinen-Gehäuse 208, 210 und das Kühlmittel-Thermostatventil 106.The first coolant subcycle 100 includes the coolant pump 102, the exhaust gas recirculation heat exchanger 104, and the coolant thermostat valve 106, the second coolant subcycle 200 includes the coolant pump 102, the engine housing 208, 210, and the coolant thermostatic valve 106th

In einem Betriebszustand, in dem eine Kühlung der Brennkraftmaschine nicht erforderlich ist, das rückgeführte Abgas jedoch gekühlt wird (Figur 1), ist das erste Absperrventil 402 geschlossen, sodass ein Kühlmittelumlauf im zweiten Kühlmittel-Teilkreislauf 200 im Wesentlichen unterbunden ist. Das Kühlmittel wird daher im ersten Kühlmittel-Teilkreislauf 100 von der Kühlmittel-Pumpe 102 zum Kurbelgehäuse 208 gefördert, durchströmt dieses jedoch nur auf sehr kurzem Weg, um ohne wesentliche Wärmeaufnahme zum Abgasrückführ-Wärmetauscher 104 zu strömen. Weiter strömt das Kühlmittel zum Kühlmittel-Thermostatventil 106 und zurück zur Kühlmittel-Pumpe 102. Eine Kühlmittelströmung durch das Kurbelgehäuse 208, den Zylinderkopf 210 und den Kühlmittel-Wärmetauscher 216 ist unterbunden. Ebenfalls unterbunden ist eine Durchströmung des Heizungs-Wärmetauschers 318, indem das zweite Absperrventil 404 geschlossen ist.In an operating state in which cooling of the internal combustion engine is not required, but the recirculated exhaust gas is cooled ( FIG. 1 ), the first shut-off valve 402 is closed, so that a coolant circulation in the second coolant subcircuit 200 is substantially prevented. The coolant is therefore conveyed in the first coolant subcircuit 100 from the coolant pump 102 to the crankcase 208, but flows through this only very short path to flow to the exhaust gas recirculation heat exchanger 104 without significant heat absorption. Further, the coolant flows to the coolant thermostatic valve 106 and back to the coolant pump 102. Coolant flow through the crankcase 208, the cylinder head 210, and the coolant heat exchanger 216 is inhibited. Also prevented is a flow through the heating heat exchanger 318 by the second shut-off valve 404 is closed.

In einem Betriebszustand, in dem eine Kühlung der Brennkraftmaschine erforderlich ist (Figur 2), ist das erste Absperrventil 402 geöffnet, sodass das Kühlmittel sowohl im ersten Kühlmittel-Teilkreislauf 100 und als auch im zweiten Kühlmittel-Teilkreislauf 200 umläuft. Eine Durchströmung des Abgasrückführ-Wärmetauschers 104 im ersten Kühlmittel-Teilkreislauf 100 erfolgt wie oben beschrieben. Zusätzlich wird der zweite Kühlmittel-Teilkreislauf 200 durchströmt. Dabei sperrt gemäß Figur 2 das Kühlmittel-Thermostatventil 106 eine Durchströmung des Kühlmittel-Wärmetauschers 216, sodass das Kühlmittel ausgehend vom Zylinderkopf 210 zwischen den Absperrventilen 404 und 402 einströmt und nachfolgend durch das Thermostatventil 106 zur Kühlmittel-Pumpe 102 strömt.In an operating state in which cooling of the internal combustion engine is required ( FIG. 2 ), the first shut-off valve 402 is opened, so that the coolant circulates in both the first coolant subcircuit 100 and in the second coolant subcircuit 200. A flow through the Exhaust gas recirculation heat exchanger 104 in the first coolant subcircuit 100 takes place as described above. In addition, the second coolant subcircuit 200 is flowed through. It locks according to FIG. 2 the coolant thermostatic valve 106 flows through the coolant heat exchanger 216, so that the coolant flows in from the cylinder head 210 between the shut-off valves 404 and 402 and subsequently flows through the thermostatic valve 106 to the coolant pump 102.

In dem in Figur 3 dargestellten Betriebszustand, in dem eine Kühlung der Brennkraftmaschine und zusätzlich eine Kühlung des Kühlmittels erforderlich ist, ermöglicht das Thermostatventil 106 eine Durchströmung des Kühlmittel-Wärmetauschers 216, sodass das Kühlmittel ausgehend vom Zylinderkopf 210 den Kühlmittel-Wärmetauscher 216 durchströmt und nachfolgend durch das Thermostatventil 106 zur Kühlmittel-Pumpe 102 strömt. Mittels des zweiten Absperrventils 404 wird eine Durchströmung des Heizungs-Wärmetauschers 318 geregelt.In the in FIG. 3 shown operating state in which cooling of the engine and additionally cooling of the coolant is required, the thermostatic valve 106 allows flow through the coolant heat exchanger 216, so that the coolant from the cylinder head 210 flows through the coolant heat exchanger 216 and subsequently through the thermostatic valve 106 for Coolant pump 102 flows. By means of the second shut-off valve 404, a flow through the heating heat exchanger 318 is controlled.

Mit der Erfindung kann eine Verbrauchsabsenkung insbesondere auch in besonderen Fahrzyklen für Emissions- und Verbrauchsmessungen, wie dem Europäischer Fahrzyklus für Emissions- und Verbrauchsmessungen auf Rollenprüfständen (MVEG-Zyklus) erzielt werden.With the invention, a reduction in consumption especially in special driving cycles for emission and consumption measurements, such as the European driving cycle for emission and consumption measurements on chassis dynamometers (MVEG cycle) can be achieved.

Claims (6)

  1. A means for cooling a motor vehicle internal combustion engine in a cooling circuit with a coolant pump (102), an internal-combustion engine housing (208, 209, 210), an exhaust-gas recirculation heat exchanger (104) and a coolant heat exchanger (216), wherein
    - the coolant pump (102) and the exhaust-gas recirculation heat exchanger (104) are encompassed by a first partial coolant circuit (100) and
    - the coolant pump (102), the internal-combustion engine housing (208, 210) and the coolant heat exchanger (216) by a second partial coolant circuit (200),
    and
    - a first shutoff valve (204, 402) for opening or closing the second partial coolant circuit (200) and also
    - a thermostatic coolant valve (106) for regulating a coolant throughflow through the coolant heat exchanger (216), which is adapted to prevent and to permit a throughflow through the coolant heat exchanger (216),
    are provided.
  2. A cooling means according to one of the preceding claims, comprising a heating heat exchanger (318), wherein the heating heat exchanger (318) is encompassed by a third partial coolant circuit (300), and a second shutoff valve (404) for opening or closing the third partial coolant circuit (300) is provided.
  3. A method for operating a cooling means according to one of the preceding claims, wherein at a temperature of the internal combustion engine which is below a predetermined first value the first shutoff valve (402) is closed and coolant circulation in the second partial coolant circuit (200) is prevented, so that the coolant circulates in the first partial coolant circuit (100).
  4. A method according to Claim 3, wherein at a temperature of the internal combustion engine above a predetermined first value the first shutoff valve (402) is opened and the coolant circulates both in the first partial coolant circuit (100) and in the second partial coolant circuit (200).
  5. A method according to one of Claims 3 - 4, wherein the thermostatic coolant valve (106) at a temperature of the internal combustion engine below a predetermined second value prevents a throughflow through the coolant heat exchanger (216) and at a temperature of the internal combustion engine above a predetermined second value makes a throughflow through the coolant heat exchanger (216) possible.
  6. A method according to one of Claims 3 - 5, wherein the second shutoff valve (404) opens or closes dependent on the temperature of the internal combustion engine, the external temperature, a driver-side heating demand and/or other parameters, so that a coolant circulation in the third coolant circuit (300) is substantially prevented or the coolant circulates both in the first (100) and/or second (200) and in the third partial coolant circuit (300).
EP09776737.0A 2008-08-08 2009-06-16 Cooling device for a motor vehicle internal combustion engine, and method for operating the same Active EP2307678B1 (en)

Applications Claiming Priority (2)

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DE200810037062 DE102008037062A1 (en) 2008-08-08 2008-08-08 Cooling device for a motor vehicle internal combustion engine and method for operating the same
PCT/EP2009/004317 WO2010015294A1 (en) 2008-08-08 2009-06-16 Cooling device for a motor vehicle internal combustion engine, and method for operating the same

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EP2307678B1 true EP2307678B1 (en) 2019-04-10

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DE102012205001B4 (en) 2012-02-21 2022-02-03 Bayerische Motoren Werke Aktiengesellschaft Coolant circuit for an internal combustion engine and method for operating the internal combustion engine
DE102017212548A1 (en) 2017-07-21 2019-01-24 Bayerische Motoren Werke Aktiengesellschaft Coolant circuit for an internal combustion engine

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DE19633190B4 (en) * 1996-08-17 2004-02-26 Daimlerchrysler Ag Cooling system for an internal combustion engine
DE10146313A1 (en) * 2001-09-20 2003-04-17 Daimler Chrysler Ag Coolant circulation system has flow direction in branch circuit reversible by means of pump or valve
DE10332947A1 (en) * 2003-07-19 2005-02-03 Daimlerchrysler Ag Internal combustion engine for a motor vehicle
DE10351148A1 (en) * 2003-11-03 2005-06-02 Bayerische Motoren Werke Ag Cooling system for a combustion engine of a vehicle with a shut-off water pump
DE102004052137A1 (en) * 2004-10-27 2006-05-11 Bayerische Motoren Werke Ag Coolant circuit for internal combustion engine has crankcase-coolant circuit and cylinder head-coolant circuit whereby they are implemented as separate coolant circuit and crankcase-coolant circuit is lockable with actuating element
DE102006020951A1 (en) * 2005-07-28 2007-02-01 Audi Ag Cooling system for a vehicle and method for operating a cooling system
FR2897392A1 (en) * 2006-02-10 2007-08-17 Renault Sas Cooling device for e.g. thermal engine of motor vehicle, has auxiliary coolant circuit comprising exchanger to cool exhaust gas recirculation device and connected to main coolant circuit by upstream junction situated between pump and engine
DE502007001624D1 (en) * 2007-01-17 2009-11-12 Ford Global Tech Llc Integrated engine cooling system

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