EP2375025A2 - Coolant circuit for a combustion engine - Google Patents

Coolant circuit for a combustion engine Download PDF

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Publication number
EP2375025A2
EP2375025A2 EP10015802A EP10015802A EP2375025A2 EP 2375025 A2 EP2375025 A2 EP 2375025A2 EP 10015802 A EP10015802 A EP 10015802A EP 10015802 A EP10015802 A EP 10015802A EP 2375025 A2 EP2375025 A2 EP 2375025A2
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EP
European Patent Office
Prior art keywords
crankcase
cylinder head
heat exchanger
combustion engine
internal combustion
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
EP10015802A
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German (de)
French (fr)
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EP2375025B1 (en
EP2375025A3 (en
Inventor
Matthias Honzen
Markus Köhne
Volker Boestfleisch
Hermann Henning
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Audi AG
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Audi AG
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Publication of EP2375025A2 publication Critical patent/EP2375025A2/en
Publication of EP2375025A3 publication Critical patent/EP2375025A3/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/02—Arrangements for cooling cylinders or cylinder heads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/12—Arrangements for cooling other engine or machine parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/02—Arrangements for cooling cylinders or cylinder heads
    • F01P2003/027—Cooling cylinders and cylinder heads in parallel
    • 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
    • F01P2060/02—Intercooler
    • 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
    • F01P2060/04—Lubricant cooler
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/16—Outlet manifold

Definitions

  • Cooling circuit for an internal combustion engine in particular for an internal combustion engine with separate flow through the cylinder head and cylinder crankcase, and a heat exchanger for cooling of operating materials of the internal combustion engine.
  • Such cooling circuits are used in the automotive industry for heat dissipation from the internal combustion engine and for cooling of operating materials of the internal combustion engine, such as exhaust gas, fresh gas or lubricant, which can affect the efficiency and / or the exhaust gas composition of the internal combustion engine.
  • the DE 10 2004 052 137 A1 shows a dual-circuit cooling for an internal combustion engine with a crankcase and a cylinder head.
  • the crankcase is incorporated in a crankcase coolant circuit while the cylinder head is incorporated into a separate cylinder head coolant circuit. Both coolant circuits are fed by a common coolant pump.
  • the crankcase coolant circuit can be closed by an actuator, whereby the crankcase heats up faster after a cold start. Furthermore, it is possible to operate the two coolant circuits at different temperature levels.
  • the DE 103 32 947 A1 also describes an internal combustion engine for a motor vehicle with a dual-circuit cooling, in the cylinder head and cylinder crankcase have separate coolant branches, which are fed via a common inlet from a coolant pump.
  • the coolant on the cylinder head and the cylinder crankcase is recombined after exiting the corresponding components and recirculated to the coolant pump.
  • the coolant can optionally be performed via a branch with exhaust gas cooler, heater core and oil cooler to the coolant pump or passed through a second branch either to the main heat exchanger or bypassing the main heat exchanger directly to the coolant pump.
  • Object of the present invention is therefore to provide a cooling circuit for an internal combustion engine, in which a heat exchanger for cooling of operating materials of the internal combustion engine can be arranged with little space requirement and operated as efficiently as possible.
  • a refrigeration cycle for an internal combustion engine comprising an internal combustion engine having at least a cylinder head and a crankcase, a coolant pump, a main heat exchanger and a heat exchanger for a fuel of the internal combustion engine, wherein the cooling circuit downstream of the coolant pump between a branch point and a junction splits, so that the at least a cylinder head in a cylinder head branch circuit and the crankcase in one Crankcase branch circuit is involved and wherein the heat exchanger is arranged for a fuel in the cylinder head branch circuit downstream of the at least one cylinder head.
  • the coolant of the cylinder head branch circuit which is cooler than that of the crankcase branch circuit, flows through it.
  • the fuel in the corresponding heat exchanger can be better cooled, which has a positive effect on the efficiency and / or the exhaust gas composition of the internal combustion engine.
  • other elements such as a heat exchanger, can be integrated as needed.
  • a shut-off valve in the crankcase branch circuit is arranged downstream of the crankcase. Through the shut-off valve, the coolant flow in the crankcase branch circuit can be regulated. Thus, by a shut-off of the crankcase branch circuit preferably after the start of the internal combustion engine, a faster heating of the same can be achieved.
  • the main heat exchanger is arranged downstream of the connection point.
  • the main heat exchanger has the largest cooling capacity and can be supplied with coolant from the cylinder head and the crankcase.
  • a control valve between the coolant pump and main heat exchanger is arranged.
  • the control valve regulates the coolant flow to be supplied to the coolant pump.
  • a bypass line branches off between the main water cooler and the connection point and is connected to the control valve.
  • the bypass line is used for bypassing the main heat exchanger by the coolant is diverted from the cylinder head and the crankcase downstream of the junction and the control valve is supplied.
  • the control valve can switch depending on the temperature between the flow through the bypass line or the main heat exchanger.
  • the control valve is preferably designed as a map thermostat.
  • two or more cylinder heads in the cylinder head branch circuit are flowed through in parallel and the heat exchanger for the fuel is arranged downstream of the cylinder heads.
  • the heat exchanger for the fuel is arranged downstream of the cylinder heads.
  • the heat exchanger for a fuel is designed as a charge air cooler.
  • An intercooler is used to cool fresh air compressed by a supercharger, which results in efficiency gains.
  • the heat exchanger for a fuel is designed as an exhaust gas cooler.
  • an exhaust gas cooler at least part of the exhaust gas exiting the internal combustion engine is cooled to supply it as an inert gas to the combustion process in the internal combustion engine (exhaust gas recirculation). The resulting reduction in the combustion temperature reduces the proportion of nitrogen oxides in the exhaust gas.
  • the figure shows a schematic view of the cooling circuit of an internal combustion engine.
  • an internal combustion engine 2 has a crankcase 4, which includes cylinders in individual combustion chambers, and a cylinder head 3, which contains the devices required for the gas exchange of the combustion chambers.
  • the internal combustion engine 2 converts chemical energy into mechanical and thermal energy during its operation, which is why it is integrated in a cooling circuit 1 for heat removal.
  • the coolant pump 5 conveys coolant to the internal combustion engine 2, wherein the coolant flow is divided at a branch point A into two parallel branch circuits 8 and 9.
  • the cylinder head 3 is integrated into a cylinder head branch circuit 8 and the crankcase 4 into a crankcase branch circuit 9.
  • crankcase 4 heats up faster and more vigorously than the cylinder head 3 during operation of the internal combustion engine 2.
  • the branch circuits 8 and 9 are located downstream of the cylinder head 3 and the crankcase 4 at a connection point B. merged again.
  • a heat exchanger 7 for a fuel of the internal combustion engine 2 is arranged between the cylinder head 3 and junction B.
  • Operating materials in this context are gases or liquids that are required for the function of the internal combustion engine 2, such as exhaust gas, fresh gas or lubricant.
  • a check valve 10 is arranged, whereby the crankcase branch circuit 9 for the purpose of faster heating of the internal combustion engine 2, in particular the crankcase 4, if necessary, can be shut off.
  • the shut-off valve 10 is preferably designed as a vacuum-operated rotary valve. From the junction B, the coolant passes to a main heat exchanger 6 and from there to a control valve 11. The output of the control valve 11 is connected to the suction side 5 of the coolant pump 5. Between the connection point B and the main heat exchanger 6 branches off at a bypass branch C from a bypass line 12, can pass through the coolant from the internal combustion engine 2, bypassing the main water cooler 6 to the control valve 11 and thus to the coolant pump 5.
  • control valve 11 is preferably designed as a map-controlled thermostat or a rotary valve with two inlets and one outlet.
  • the cooling circuit 1 of the invention is not limited to the elements shown. Rather, additional heat exchanger, oil cooler, water cooler, etc. can be integrated into the cooling circuit 1 or a partial circuit thereof.

Abstract

The circuit (1) has a heat exchanger (7) e.g. charging air cooler, cooling operating medium e.g. lubricant, of an internal combustion engine (2). A downstream of a coolant pump (5) is divided between a branch site (A) and a connection site (B) such that a cylinder head (3) is incorporated in a cylinder head branch circuit (8), and a crankcase (4) is incorporated in a crankcase branch circuit (9) for the operating medium that is located in a cylinder head branch circuit downstream of the cylinder head. A shutoff valve (10) is located in the crankcase branch circuit downstream of the crankcase.

Description

Kühlkreislauf für eine Brennkraftmaschine, insbesondere für eine Brennkraftmaschine mit getrennter Durchströmung von Zylinderkopf und Zylinderkurbelgehäuse, und einem Wärmetauscher zur Kühlung von Betriebsstoffen der Brennkraftmaschine.Cooling circuit for an internal combustion engine, in particular for an internal combustion engine with separate flow through the cylinder head and cylinder crankcase, and a heat exchanger for cooling of operating materials of the internal combustion engine.

Derartige Kühlkreisläufe werden im Kraftfahrzeugbau zur Wärmeabfuhr von der Brennkraftmaschine und zur Kühlung von Betriebsstoffen der Brennkraftmaschine, wie beispielsweise Abgas, Frischgas oder Schmiermittel genutzt, wodurch sich der Wirkungsgrad und/oder die Abgaszusammensetzung der Brennkraftmaschine beeinflussen lässt.Such cooling circuits are used in the automotive industry for heat dissipation from the internal combustion engine and for cooling of operating materials of the internal combustion engine, such as exhaust gas, fresh gas or lubricant, which can affect the efficiency and / or the exhaust gas composition of the internal combustion engine.

Die DE 10 2004 052 137 A1 zeigt eine Zweikreiskühlung für eine Brennkraftmaschine mit einem Kurbelgehäuse und einem Zylinderkopf. Das Kurbelgehäuse ist in einen Kurbelgehäuse-Kühlmittelkreislauf eingebunden, während der Zylinderkopf in einen separaten Zylinderkopf-Kühlmittelkreislauf eingebunden ist. Beide Kühlmittelkreisläufe werden von einer gemeinsamen Kühlmittelpumpe gespeist. Der Kurbelgehäuse-Kühlmittelkreislauf kann durch ein Stellelement verschlossen werden, wodurch sich das Kurbelgehäuse nach einem Kaltstart schneller erwärmt. Weiterhin ist es möglich die beiden Kühlmittelkreisläufe auf unterschiedlichen Temperaturniveaus zu betreiben.The DE 10 2004 052 137 A1 shows a dual-circuit cooling for an internal combustion engine with a crankcase and a cylinder head. The crankcase is incorporated in a crankcase coolant circuit while the cylinder head is incorporated into a separate cylinder head coolant circuit. Both coolant circuits are fed by a common coolant pump. The crankcase coolant circuit can be closed by an actuator, whereby the crankcase heats up faster after a cold start. Furthermore, it is possible to operate the two coolant circuits at different temperature levels.

Die DE 103 32 947 A1 beschreibt ebenfalls eine Brennkraftmaschine für ein Kraftfahrzeug mit einer Zweikreiskühlung, bei der Zylinderkopf und Zylinderkurbelgehäuse über separate Kühlmittelzweige verfügen, die über einen gemeinsamen Zulauf von einer Kühlmittelpumpe gespeist werden. Das Kühlmittel auf dem Zylinderkopf und dem Zylinderkurbelgehäuse wird nach dem Austritt aus den entsprechenden Bauteilen wieder zusammengeführt und zur Kühlmittelpumpe rezirkuliert. Dabei kann das Kühlmittel wahlweise über einen Zweig mit Abgaskühler, Heizungswärmetauscher und Ölkühler zur Kühlmittelpumpe geführt werden oder aber über einen zweiten Zweig wahlweise zum Hauptwärmetauscher oder unter Umgehung des Hauptwärmetauschers direkt zur Kühlmittelpumpe geleitet werden.The DE 103 32 947 A1 also describes an internal combustion engine for a motor vehicle with a dual-circuit cooling, in the cylinder head and cylinder crankcase have separate coolant branches, which are fed via a common inlet from a coolant pump. The coolant on the cylinder head and the cylinder crankcase is recombined after exiting the corresponding components and recirculated to the coolant pump. In this case, the coolant can optionally be performed via a branch with exhaust gas cooler, heater core and oil cooler to the coolant pump or passed through a second branch either to the main heat exchanger or bypassing the main heat exchanger directly to the coolant pump.

Nachteilig ist jedoch, dass der Abgaskühler bei dem gezeigten Kühlmittelkreislauf nur mit solchem Kühlmittel beaufschlagt werden kann, welches bereits den gesamten Motor, also sowohl den Zylinderkopf, als auch das Zylinderkurbelgehäuse, durchströmt hat und dementsprechend erwärmt ist. Dadurch ergeben sich Wirkungsgradverluste bei der Kühlung des Abgases. Zudem benötigt die Integration von zwei verschiedenen Zweigen zur Rückführung des Kühlmittels zur Kühlmittelpumpe einen großen Bauraum.The disadvantage, however, is that the exhaust gas cooler can be acted upon in the coolant circuit shown only with such coolant, which has already flowed through the entire engine, so both the cylinder head, and the cylinder crankcase, and is heated accordingly. This results in efficiency losses in the cooling of the exhaust gas. In addition, the integration of two different branches for returning the coolant to the coolant pump requires a large amount of space.

Aufgabe der vorliegenden Erfindung ist es daher einen Kühlkreislauf für eine Brennkraftmaschine bereitzustellen, in dem ein Wärmetauscher zur Kühlung von Betriebsstoffen der Brennkraftmaschine mit geringem Bauraumbedarf angeordnet und möglichst effizient betrieben werden kann.Object of the present invention is therefore to provide a cooling circuit for an internal combustion engine, in which a heat exchanger for cooling of operating materials of the internal combustion engine can be arranged with little space requirement and operated as efficiently as possible.

Diese Aufgabe wird durch die Merkmale des Patentanspruchs 1 gelöst.This object is solved by the features of patent claim 1.

Ein Kühlkreislauf für eine Brennkraftmaschine, aufweisend eine Brennkraftmaschine mit mindestens einem Zylinderkopf und einem Kurbelgehäuse, eine Kühlmittelpumpe, einen Hauptwärmetauscher und einen Wärmetauscher für einen Betriebsstoff der Brennkraftmaschine, wobei sich der Kühlkreislauf stromab der Kühlmittelpumpe zwischen einer Verzweigungsstelle und einer Verbindungsstelle aufteilt, so dass der mindestens eine Zylinderkopf in einem Zylinderkopf-Zweigkreislauf und das Kurbelgehäuse in einem Kurbelgehäuse-Zweigkreislauf eingebunden ist und wobei der Wärmetauscher für einen Betriebsstoff im Zylinderkopf-Zweigkreislauf stromab des mindestens einen Zylinderkopfes angeordnet ist.A refrigeration cycle for an internal combustion engine, comprising an internal combustion engine having at least a cylinder head and a crankcase, a coolant pump, a main heat exchanger and a heat exchanger for a fuel of the internal combustion engine, wherein the cooling circuit downstream of the coolant pump between a branch point and a junction splits, so that the at least a cylinder head in a cylinder head branch circuit and the crankcase in one Crankcase branch circuit is involved and wherein the heat exchanger is arranged for a fuel in the cylinder head branch circuit downstream of the at least one cylinder head.

Indem der Wärmetauscher für einen Betriebsstoff der Brennkraftmaschine stromab des Zylinderkopfes und stromauf der Verbindungsstelle in den Zylinderkopf-Zweigkreislauf eingebunden ist, wird dieser von dem im Vergleich zum Kurbelgehäuse-Zweigkreislauf kühleren Kühlmittel des Zylinderkopf-Zweigkreislaufs durchströmt. Dadurch kann der Betriebsstoff in dem entsprechenden Wärmetauscher besser gekühlt werden, was sich positiv auf den Wirkungsgrad und/oder die Abgaszusammensetzung der Brennkraftmaschine auswirkt. Natürlich können neben den genannten Bestandteilen des Kühlkreislaufs auch noch weitere Elemente, wie ein Heizungswärmetauscher, je nach Bedarf integriert werden.By incorporating the heat exchanger for an engine fuel downstream of the cylinder head and upstream of the junction into the cylinder head branch circuit, the coolant of the cylinder head branch circuit, which is cooler than that of the crankcase branch circuit, flows through it. As a result, the fuel in the corresponding heat exchanger can be better cooled, which has a positive effect on the efficiency and / or the exhaust gas composition of the internal combustion engine. Of course, in addition to the aforementioned components of the cooling circuit also other elements, such as a heat exchanger, can be integrated as needed.

In einer bevorzugten Ausführung ist ein Absperrventil im Kurbelgehäuse-Zweigkreislauf stromab des Kurbelgehäuses angeordnet. Durch das Absperrventil kann der Kühlmittelvolumenstrom im Kurbelgehäuse-Zweigkreislauf reguliert werden. So kann durch eine Absperrung des Kurbelgehäuse-Zweigkreislaufs vorzugsweise nach dem Start der Brennkraftmaschine eine schnellere Erwärmung derselben erzielt werden.In a preferred embodiment, a shut-off valve in the crankcase branch circuit is arranged downstream of the crankcase. Through the shut-off valve, the coolant flow in the crankcase branch circuit can be regulated. Thus, by a shut-off of the crankcase branch circuit preferably after the start of the internal combustion engine, a faster heating of the same can be achieved.

In einer bevorzugten Ausführung ist der Hauptwärmetauscher stromab der Verbindungsstelle angeordnet. Der Hauptwärmetauscher hat die größte Kühlkapazität und kann mit Kühlmittel aus dem Zylinderkopf und dem Kurbelgehäuse beaufschlagt werden.In a preferred embodiment, the main heat exchanger is arranged downstream of the connection point. The main heat exchanger has the largest cooling capacity and can be supplied with coolant from the cylinder head and the crankcase.

In einer bevorzugten Ausführung ist ein Steuerventil zwischen Kühlmittelpumpe und Hauptwärmetauscher angeordnet. Das Steuerventil reguliert den der Kühlmittelpumpe zuzuführenden Kühlmittelvolumenstrom.In a preferred embodiment, a control valve between the coolant pump and main heat exchanger is arranged. The control valve regulates the coolant flow to be supplied to the coolant pump.

In einer bevorzugten Ausführung zweigt zwischen Hauptwasserkühler und Verbindungsstelle eine Bypassleitung ab, die an dem Steuerventil angebunden ist. Die Bypassleitung dient der bedarfsweisen Umgehung des Hauptwärmetauschers, indem das Kühlmittel aus dem Zylinderkopf und dem Kurbelgehäuse stromab der Verbindungsstelle abgezweigt wird und dem Steuerventil zugeführt wird. Das Steuerventil kann temperaturabhängig zwischen der Durchströmung der Bypassleitung oder des Hauptwärmetauschers umschalten. Dazu ist das Steuerventil bevorzugt als ein Kennfeldthermostat ausgebildet.In a preferred embodiment, a bypass line branches off between the main water cooler and the connection point and is connected to the control valve. The bypass line is used for bypassing the main heat exchanger by the coolant is diverted from the cylinder head and the crankcase downstream of the junction and the control valve is supplied. The control valve can switch depending on the temperature between the flow through the bypass line or the main heat exchanger. For this purpose, the control valve is preferably designed as a map thermostat.

In einer bevorzugten Ausführung werden zwei oder mehr Zylinderköpfe im Zylinderkopf-Zweigkreislauf parallel durchströmt und der Wärmetauscher für den Betriebsstoff ist stromab der Zylinderköpfe angeordnet. Bei Brennkraftmaschinen mit Zylinderbänken in V- oder W-Anordnung finden sich mehrere Zylinderköpfe. Diese sind parallel in den Zylinderkopf-Zweigkreislauf eingebunden, wobei das Kühlmittel aus den Zylinderköpfen vor der Zuführung in den Wärmetauscher des Betriebsstoffes wieder gesammelt wird.In a preferred embodiment, two or more cylinder heads in the cylinder head branch circuit are flowed through in parallel and the heat exchanger for the fuel is arranged downstream of the cylinder heads. In internal combustion engines with cylinder banks in V or W arrangement, there are several cylinder heads. These are incorporated in parallel in the cylinder head branch circuit, wherein the coolant from the cylinder heads is collected again before being fed into the heat exchanger of the operating material.

In einer bevorzugten Ausführung ist der Wärmetauscher für einen Betriebsstoff als Ladeluftkühler ausgebildet. Ein Ladeluftkühler dient der Abkühlung von durch einen Lader verdichteter Frischluft, wodurch sich Wirkungsgradgewinne erzielen lassen.In a preferred embodiment, the heat exchanger for a fuel is designed as a charge air cooler. An intercooler is used to cool fresh air compressed by a supercharger, which results in efficiency gains.

In einer bevorzugten Ausführung ist der Wärmetauscher für einen Betriebsstoff als Abgaskühler ausgebildet. In einem Abgaskühler wird zumindest ein Teil des aus der Brennkraftmaschine austretenden Abgases gekühlt, um es als Inertgas dem Verbrennungsprozess in der Brennkraftmaschine zuzuführen (Abgasrückführung). Die daraus resultierende Verringerung der Verbrennungstemperatur reduziert den Anteil an Stickoxiden im Abgas.In a preferred embodiment, the heat exchanger for a fuel is designed as an exhaust gas cooler. In an exhaust gas cooler, at least part of the exhaust gas exiting the internal combustion engine is cooled to supply it as an inert gas to the combustion process in the internal combustion engine (exhaust gas recirculation). The resulting reduction in the combustion temperature reduces the proportion of nitrogen oxides in the exhaust gas.

Weitere Einzelheiten, Merkmale und Vorteile der Erfindung ergeben sich aus der nachstehenden Beschreibung eines bevorzugten Ausführungsbeispiels unter Bezugnahme auf die Zeichnung.Further details, features and advantages of the invention will become apparent from the following description of a preferred embodiment with reference to the drawings.

Darin zeigt die Figur eine schematische Ansicht des Kühlkreislaufs einer Brennkraftmaschine.Therein, the figure shows a schematic view of the cooling circuit of an internal combustion engine.

Gemäß der Figur hat eine Brennkraftmaschine 2 ein Kurbelgehäuse 4, welches Zylinder in einzelnen Brennräumen beinhaltet, und einen Zylinderkopf 3, der die für den Gaswechsel der Brennräume benötigten Vorrichtungen enthält. Die Brennkraftmaschine 2 setzt bei ihrem Betrieb chemische Energie in mechanische und thermische Energie um, weshalb diese in einen Kühlkreislauf 1 zur Wärmeabfuhr eingebunden ist. Bei der dargestellten Zweikreiskühlung fördert die Kühlmittelpumpe 5 Kühlmittel zur Brennkraftmaschine 2, wobei der Kühlmittelstrom sich an einer Verzweigungsstelle A in zwei parallele Zweigkreisläufe 8 und 9 aufteilt. Der Zylinderkopf 3 ist in einen Zylinderkopf-Zweigkreislauf 8 und das Kurbelgehäuse 4 in einen Kurbelgehäuse-Zweigkreislauf 9 eingebunden. Durch die in den Brennräumen des Kurbelgehäuses 4 hauptsächlich stattfindende Umsetzung der Energie, erwärmt sich das Kurbelgehäuse 4 beim Betrieb der Brennkraftmaschine 2 schneller und stärker als der Zylinderkopf 3. Die Zweigkreisläufe 8 und 9 werden stromab des Zylinderkopfes 3 beziehungsweise des Kurbelgehäuses 4 an einer Verbindungsstelle B wieder zusammengeführt. Im Zylinderkopf-Zweigkreislauf 8 ist zwischen Zylinderkopf 3 und Verbindungsstelle B ein Wärmetauscher 7 für ein Betriebsstoff der Brennkraftmaschine 2 angeordnet. Betriebsstoffe sind in diesem Zusammenhang Gase oder Flüssigkeiten, die für die Funktion der Brennkraftmaschine 2 benötigt werden, wie beispielsweise Abgas, Frischgas oder Schmiermittel. Im Kurbelgehäuse-Zweigkreislauf 9 zwischen Kurbelgehäuse 4 und Verbindungsstelle B ist ein Absperrventil 10 angeordnet, wodurch der Kurbelgehäuse-Zweigkreislauf 9 zum Zwecke einer schnelleren Erwärmung der Brennkraftmaschine 2, insbesondere des Kurbelgehäuses 4, bedarfsweise abgesperrt werden kann. Das Absperrventil 10 ist vorzugsweise als ein unterdruckbetätigtes Drehventil auszuführen. Von der Verbindungsstelle B gelangt das Kühlmittel zu einem Hauptwärmetauscher 6 und von diesem zu einem Steuerventil 11. Der Ausgang des Steuerventils 11 ist mit der Ansaugseite 5 der Kühlmittelpumpe 5 verbunden. Zwischen der Verbindungsstelle B und dem Hauptwärmetauscher 6 zweigt an einem Bypassabzweig C eine Bypassleitung 12 ab, durch die Kühlmittel aus der Brennkraftmaschine 2 unter Umgehung des Hauptwasserkühlers 6 zum Steuerventil 11 und somit zur Kühlmittelpumpe 5 gelangen kann. Das Steuerventil 11 ist zu diesem Zweck vorzugsweise als ein Kennfeldthermostat oder ein Drehschieber mit zwei Zuläufen und einem Ausgang auszuführen. Natürlich beschränkt sich der erfindungsgemäße Kühlkreislauf 1 nicht auf die dargestellten Elemente. Vielmehr können zusätzliche Heizungswärmetauscher, Ölkühler, Wasserkühler, etc. in den Kühlkreislauf 1 oder einen Teilkreislauf davon integriert werden.According to the figure , an internal combustion engine 2 has a crankcase 4, which includes cylinders in individual combustion chambers, and a cylinder head 3, which contains the devices required for the gas exchange of the combustion chambers. The internal combustion engine 2 converts chemical energy into mechanical and thermal energy during its operation, which is why it is integrated in a cooling circuit 1 for heat removal. In the illustrated two-circuit cooling, the coolant pump 5 conveys coolant to the internal combustion engine 2, wherein the coolant flow is divided at a branch point A into two parallel branch circuits 8 and 9. The cylinder head 3 is integrated into a cylinder head branch circuit 8 and the crankcase 4 into a crankcase branch circuit 9. As a result of the conversion of the energy mainly taking place in the combustion chambers of the crankcase 4, the crankcase 4 heats up faster and more vigorously than the cylinder head 3 during operation of the internal combustion engine 2. The branch circuits 8 and 9 are located downstream of the cylinder head 3 and the crankcase 4 at a connection point B. merged again. In the cylinder head branch circuit 8, a heat exchanger 7 for a fuel of the internal combustion engine 2 is arranged between the cylinder head 3 and junction B. Operating materials in this context are gases or liquids that are required for the function of the internal combustion engine 2, such as exhaust gas, fresh gas or lubricant. In the crankcase branch circuit 9 between the crankcase 4 and junction B a check valve 10 is arranged, whereby the crankcase branch circuit 9 for the purpose of faster heating of the internal combustion engine 2, in particular the crankcase 4, if necessary, can be shut off. The shut-off valve 10 is preferably designed as a vacuum-operated rotary valve. From the junction B, the coolant passes to a main heat exchanger 6 and from there to a control valve 11. The output of the control valve 11 is connected to the suction side 5 of the coolant pump 5. Between the connection point B and the main heat exchanger 6 branches off at a bypass branch C from a bypass line 12, can pass through the coolant from the internal combustion engine 2, bypassing the main water cooler 6 to the control valve 11 and thus to the coolant pump 5. For this purpose, the control valve 11 is preferably designed as a map-controlled thermostat or a rotary valve with two inlets and one outlet. Of course, the cooling circuit 1 of the invention is not limited to the elements shown. Rather, additional heat exchanger, oil cooler, water cooler, etc. can be integrated into the cooling circuit 1 or a partial circuit thereof.

Liste der Bezugszeichen:

A
Verzweigungsstelle
B
Verbindungsstelle
C
Bypassabzweig
1
Kühlkreislauf
2
Brennkraftmaschine
3
Zylinderkopf
4
Kurbelgehäuse
5
Kühlmittelpumpe
6
Hauptwärmetauscher
7
Wärmetauscher für ein Betriebsstoff
8
Zylinderkopf-Zweigkreislauf
9
Kurbelgehäuse-Zweigkreislauf
10
Absperrventil
11
Steuerventil
List of reference numbers:
A
branching point
B
junction
C
bypass branch
1
Cooling circuit
2
Internal combustion engine
3
cylinder head
4
crankcase
5
Coolant pump
6
Main heat exchanger
7
Heat exchanger for a fuel
8th
Cylinder head branch circuit
9
Crankcase branch circuit
10
shut-off valve
11
control valve

Claims (9)

Kühlkreislauf (1) für eine Brennkraftmaschine (2), aufweisend eine Brennkraftmaschine (2) mit mindestens einem Zylinderkopf (3) und einem Kurbelgehäuse (4), eine Kühlmittelpumpe (5), einen Hauptwärmetauscher (6) und einen Wärmetauscher (7) für einen Betriebsstoff der Brennkraftmaschine (2), wobei sich der Kühlkreislauf (1) stromab der Kühlmittelpumpe (5) zwischen einer Verzweigungsstelle (A) und einer Verbindungsstelle (B) aufteilt, so dass der mindestens eine Zylinderkopf (3) in einem Zylinderkopf-Zweigkreislauf (8) und das Kurbelgehäuse (4) in einem Kurbelgehäuse-Zweigkreislauf (9) eingebunden ist, dadurch gekennzeichnet, dass der Wärmetauscher (7) für einen Betriebsstoff im Zylinderkopf-Zweigkreislauf (8) stromab des mindestens einen Zylinderkopfes (3) angeordnet ist.Cooling circuit (1) for an internal combustion engine (2), comprising an internal combustion engine (2) with at least one cylinder head (3) and a crankcase (4), a coolant pump (5), a main heat exchanger (6) and a heat exchanger (7) for a Fuel of the internal combustion engine (2), wherein the cooling circuit (1) downstream of the coolant pump (5) between a branch point (A) and a junction (B), so that the at least one cylinder head (3) in a cylinder head branch circuit (8 ) and the crankcase (4) in a crankcase branch circuit (9) is integrated, characterized in that the heat exchanger (7) for a fuel in the cylinder head branch circuit (8) downstream of the at least one cylinder head (3) is arranged. Kühlkreislauf nach Anspruch 1, dadurch gekennzeichnet, dass ein Absperrventil (10) im Kurbelgehäuse-Zweigkreislauf (9) stromab des Kurbelgehäuses (4) angeordnet ist.Cooling circuit according to claim 1, characterized in that a shut-off valve (10) in the crankcase branch circuit (9) downstream of the crankcase (4) is arranged. Kühlkreislauf nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Hauptwärmetauscher (6) stromab der Verbindungsstelle (B) angeordnet ist.Cooling circuit according to claim 1 or 2, characterized in that the main heat exchanger (6) is arranged downstream of the connection point (B). Kühlkreislauf nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass ein Steuerventil (11) zwischen Kühlmittelpumpe (5) und Hauptwärmetauscher (6) angeordnet ist.Cooling circuit according to one of claims 1 to 3, characterized in that a control valve (11) between the coolant pump (5) and the main heat exchanger (6) is arranged. Kühlkreislauf nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass zwischen Hauptwasserkühler (6) und Verbindungsstelle (B) eine Bypassleitung (12) abzweigt, die an dem Steuerventil (11) angebunden ist.Cooling circuit according to one of claims 1 to 4, characterized in that between the main water cooler (6) and connection point (B) branches off a bypass line (12) which is connected to the control valve (11). Kühlkreislauf nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass das Steuerventil (11) als Kennfeldthermostat ausgebildet ist.Cooling circuit according to claim 4 or 5, characterized in that the control valve (11) is designed as a map thermostat. Kühlkreislauf nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass zwei oder mehr Zylinderköpfe (3) im Zylinderkopf-Zweigkreislauf (8) parallel durchströmt werden und der Wärmetauscher (7) für einen Betriebsstoff stromab der Zylinderköpfe (3) angeordnet ist.Cooling circuit according to one of claims 1 to 6, characterized in that two or more cylinder heads (3) in the cylinder head branch circuit (8) are flowed through in parallel and the heat exchanger (7) for a fuel downstream of the cylinder heads (3) is arranged. Kühlkreislauf nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass der Wärmetauscher (7) für einen Betriebsstoff als Ladeluftkühler ausgebildet ist.Cooling circuit according to one of claims 1 to 7, characterized in that the heat exchanger (7) is designed for a fuel as a charge air cooler. Kühlkreislauf nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass der Wärmetauscher (7) für ein Betriebsstoff als Abgaskühler ausgebildet ist.Cooling circuit according to one of claims 1 to 7, characterized in that the heat exchanger (7) is designed for a fuel as an exhaust gas cooler.
EP10015802.1A 2010-03-08 2010-12-18 Coolant circuit for a combustion engine Not-in-force EP2375025B1 (en)

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Application Number Priority Date Filing Date Title
DE102010010594.5A DE102010010594B4 (en) 2010-03-08 2010-03-08 Cooling circuit for an internal combustion engine

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EP (1) EP2375025B1 (en)
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Also Published As

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JP2011185267A (en) 2011-09-22
CN102191987B (en) 2013-04-03
CN102191987A (en) 2011-09-21
DE102010010594B4 (en) 2014-10-09
US8464669B2 (en) 2013-06-18
US20110214628A1 (en) 2011-09-08
DE102010010594A1 (en) 2011-09-08
EP2375025B1 (en) 2015-02-25
EP2375025A3 (en) 2013-04-17

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