WO2000025007A1 - Control device for the cooling circuit of an internal combustion engine - Google Patents

Control device for the cooling circuit of an internal combustion engine Download PDF

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Publication number
WO2000025007A1
WO2000025007A1 PCT/EP1999/007145 EP9907145W WO0025007A1 WO 2000025007 A1 WO2000025007 A1 WO 2000025007A1 EP 9907145 W EP9907145 W EP 9907145W WO 0025007 A1 WO0025007 A1 WO 0025007A1
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WO
WIPO (PCT)
Prior art keywords
circuit
cooler
control device
connection
short
Prior art date
Application number
PCT/EP1999/007145
Other languages
German (de)
French (fr)
Inventor
Kai Lehmann
Original Assignee
Daimlerchrysler 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 Daimlerchrysler Ag filed Critical Daimlerchrysler Ag
Priority to EP99948869A priority Critical patent/EP1125040A1/en
Publication of WO2000025007A1 publication Critical patent/WO2000025007A1/en
Priority to US09/841,318 priority patent/US20010042525A1/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
    • 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
    • F01P7/167—Controlling of coolant flow the coolant being liquid by thermostatic control by adjusting the pre-set temperature according to engine parameters, e.g. engine load, engine speed
    • 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
    • F01P2031/00—Fail safe
    • F01P2031/32—Deblocking of damaged thermostat
    • 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
    • F01P2037/00—Controlling
    • F01P2037/02—Controlling starting
    • 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
    • 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

Definitions

  • the invention relates to a control device for a cooling circuit of an internal combustion engine according to the kind defined in the preamble of claim 1.
  • thermostatic valves are generally used which, depending on the temperature, switch a short-circuit circuit in the warm-up phase of the internal combustion engine, then switch to mixed operation when the internal combustion engine is heated accordingly, the coolant partly still through the short-circuit circuit and partly already via a cooler Heat exchanger is guided in the cooling circuit. In later normal operation, the coolant is then generally passed completely through the cooler in the cooling circuit.
  • DE 44 38 552 Cl, DE 44 38 237 Cl and DE 42 31 649 C2 are mentioned as generic control devices.
  • thermostatic valves react very slowly to changes in temperature.
  • they are fixed to a controlled variable, namely an opening temperature, and also have high pressure losses.
  • DE 41 25 366 Cl describes a 3/2-way valve for flow liquid circuits known in vehicles, which has an axial inlet and two radial outlets.
  • the previously known valve is used as a distributor valve or mixing valve in a liquid circuit used for heating motor vehicle compartments and in a liquid circuit used for cooling motor vehicle compartments. This valve also enables mixed operation between heating and cooling.
  • the present invention has for its object to provide a control device of the type mentioned that does not have the disadvantages of the prior art, in particular that allows multiple control variables and acts quickly and without large pressure drops.
  • control device allows fast switching times and thus a quick reaction to temperature fluctuations. Furthermore, it is possible for the control variables of the control valve to be set on the control valve according to the invention from the engine in a map-controlled manner. This can e.g. done easily by an electric drive for the control valve.
  • control valve can be kept very flexible in its mode of operation, the through-flows being optimized and pressure losses in switched-on states being reduced to a minimum.
  • Another very important advantage of the solution according to the invention is that by closing all sub-circuits during a cold start or when the internal combustion engine is warming up, a clear reduction in cold start emissions can be achieved. Through the full Closing the partial circuits does not even circulate the water jacket of the internal combustion engine. In this way, the internal combustion engine can heat up even more quickly and emits fewer cold start emissions, in particular hydrocarbons.
  • a further fuel saving and thus a reduction in emissions is also achieved in that, according to the invention, it is possible to additionally reduce the power consumption of the water pump with a very low water requirement and a corresponding position of the control valve in front of the water pump by means of suction throttling.
  • the control valve according to the invention can be inserted at any point in the cooling circuit. It can advantageously be e.g. integrate in the coolant pump, preferably in the suction mouth of the pump or in the cooler. An arrangement in or on the control housing of the internal combustion engine is also possible.
  • FIG. 1 shows a cooling circuit with the control device according to the invention in cold start or warm-up, all circuits being closed,
  • FIG. 3 shows the cooling circuit according to FIG. 1 in mixed operation with a coolant flow through the short circuit and the cooler circuit
  • FIG. 4 shows the cooling circuit according to FIG. 1 with the cooler circuit fully open
  • FIG. 5 shows a simplified embodiment of the control valve according to the invention as a control element in the cold start position, corresponding to the cooling circuit according to FIG. 1,
  • FIGS. 1 to 4 Basically, the cooling circuit shown in FIGS. 1 to 4 is of a known type, which is why only the components and cooling elements essential for the invention are described below. medium flows is discussed in more detail.
  • An internal combustion engine 1 cooled by a cooling circuit is connected to a cooler circuit 2, in which a cooler 3 is located as a heat exchanger, and to a short circuit. circuit 4 connected.
  • a control valve 5 As a control element for dividing the coolant flow in the cooling circuit.
  • a coolant pump 6 Between the internal combustion engine 1 and the control valve 5 there is a coolant pump 6 through which the coolant is circulated.
  • a heating circuit 7 branches off from the cooler circuit 2 and contains a control valve 8, a heater 9 and a pump 10. The heating circuit 7 is fed to the coolant pump 6 on the suction side after the control valve 5.
  • a configuration is to be selected which enables four positions, namely a complete blocking position, a position in which the coolant, in general water, is conducted exclusively via the short circuit 4, a position in which the coolant exclusively via the Radiator circuit 2 is performed and another position in which a mixed operation, ie a partial opening of the short circuit 4 and the cooler circuit 2 is given.
  • Fig. 1 shows the cooling circuit, in which the control valve 5 is in a blocking position, so that both the short-circuit circuit 4 and the radiator circuit 2 are shut off. So that there is no circulation of the coolant in the water jacket of the internal combustion engine 1, it is of course also to be ensured in this position that the control valve 8 for the heating circuit 7 is also closed. In this position there is a suction throttling on the coolant pump 6 with a correspondingly reduced energy consumption. It is only necessary to ensure that the coolant pump 6 is designed for operation in suction throttling.
  • control valve 5 is in a position in which the cooler circuit 2 is shut off, but the short-circuit circuit 4 is open.
  • mixed operation is provided by a corresponding position of the control valve 5, a partial connection to the short-circuit circuit 4 and the cooler circuit 2 being present.
  • a switching device (not shown) can also ensure that the flow of coolant through the internal combustion engine 1 is interrupted.
  • control valve 8 for heating the passenger compartment of the vehicle can be partially or completely opened.
  • the control valve 5 can be in any way, e.g. to be driven by an electric motor. In this way it can also be controlled with regard to its positions. For optimal operation, a control device will be provided for this, the controlled variables being set under engine control.
  • a control valve 5 in principle, for example. As can be seen, it is designed in such a way that it has a rotary slide valve 11 in the form of a sleeve which is arranged in a cylindrical valve housing 12 so as to be rotatable about its longitudinal axis.
  • the rotary valve 11 is provided with an axial common connection 13 on one end face, while it is closed on the other side and there is provided with a drive device, not shown, for pivoting it about its longitudinal axis.
  • the valve housing 12 is also closed on the side facing away from the drive device, not shown.
  • the rotary valve 11 has a control opening 14 in its peripheral wall. According to the selected configuration, the control opening 14 of the rotary slide valve 11 extends over a circumferential range of more than 180 °, preferably approximately 190 to 200 °.
  • the valve housing 12 has in its cylindrical peripheral wall each an opening for a connection 15 to the short circuit 4 and a connection 16 to the cooler circuit 2.
  • the connections 15 and 16 each represent inlets, while the common connection 13 the outlet to the Coolant pump 6 forms.
  • FIG. 5 shows the position of the rotary valve 11, in which, according to FIG. 1, both the cooler circuit 2 and the short-circuit circuit 4 are completed.
  • Fig. 6 shows the position of the rotary valve 11, in which, according to the circuit of FIG. 2, the coolant circulates in the short circuit 4.
  • the position of the rotary valve 11 is selected so that the port 15 is completely opened. According to the exemplary embodiment, however, only a partial opening with a correspondingly throttled circulation of the coolant through the short circuit 4 is possible. In this way, a very sensitive control with a continuous course from a blocking position according to FIG. 5 to a completely open position according to FIG. 6 can be achieved.
  • Fig. 7 shows a mixed operation with a coolant flow both via the short circuit 4 and the cooler circuit 2.
  • the distribution it is not necessary for the distribution to be uniform, but there are also intermediate positions with different flow rates through the cooler circuit 2 and the short circuit 4 possible.
  • Fig. 8 shows a cooling circuit with an almost complete sole flow through the cooler circuit 2.
  • the short circuit 4 is closed. Throttled operation via the cooler circuit 2 is also possible here by a corresponding intermediate position of the rotary valve 11 with a partial opening of the connection 16.
  • control valve 5 can be kept very flexible.
  • rotary valve 11 with axial, semi-axial and / or radial connections or connections possible.
  • other control members can be used instead of a rotary valve 11.
  • the suction side of the coolant pump 6 is only one possible arrangement. an arrangement on the pressure side of the coolant pump 6 between the latter and the internal combustion engine 1 or also after the internal combustion engine is possible.
  • the axial collective connection 13 serves as a supply to the control valve 5 and the connections 15 and 16 serve to discharge the coolant to the cooler circuit 2 and the short-circuit circuit 4.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Multiple-Way Valves (AREA)
  • Electrically Driven Valve-Operating Means (AREA)
  • Air-Conditioning For Vehicles (AREA)

Abstract

A control device for the cooling circuit of an internal combustion engine, comprising a radiator that acts as a heat exchanger, a coolant pump and a control element that regulates the cooling circuit. The cooling circuit includes a radiator circuit and a shorted circuit. The control element is comprised of a control valve with a connection for the radiator circuit and a connection for the shorted circuit, in addition to a collector connection for supplying and discharging the coolant to or from the radiator circuit and shorted circuit. The control valve is fitted with a valve member which can be used in a selective manner to provide a blocking position for the radiator circuit and shorted circuit, a connection between the radiator circuit or the shorted circuit and the collector connection or a connection between the radiator circuit and the shorted circuit to the collector connection in mixed mode operation.

Description

Rt-.fiuervorrirht.nng für einen Kühl kre. sl auf .H ne_r Rrpπnlraft-masehi np Rt-.fiuervorrirht.nng for a refrigerator. sl on .H ne_r Rrpπnlraft-masehi np
Die Erfindung betrifft eine Steuervorrichtung für einen Kühlkreislauf einer Brennkraftmaschine nach der im Oberbegriff von Anspruch 1 näher definierten Art.The invention relates to a control device for a cooling circuit of an internal combustion engine according to the kind defined in the preamble of claim 1.
Zur Steuerung eines Kühlkreislaufes in einer Brennkraftmaschine werden im Allgemeinen Thermostatventile verwendet, die temperaturabhängig in der Aufwärmphase der Brennkraftmaschine einen Kurzschlußkreislauf schalten, anschließend bei entsprechender Erwärmung der Brennkraftmaschine in einen Mischbetrieb übergehen, wobei das Kühlmittel teilweise noch durch den Kurzschlußkreislauf und teilweise bereits über einen Kühler als Wärmetauscher im Kühlkreislauf geführt wird. Im späteren Normalbetrieb wird das Kühlmittel dann im Allgemeinen vollständig über den Kühler im Kühlkreislauf geführt. Hierzu werden beispielsweise als gattungsgemäße Steuervorrichtung die DE 44 38 552 Cl, DE 44 38 237 Cl und DE 42 31 649 C2 genannt.To control a cooling circuit in an internal combustion engine, thermostatic valves are generally used which, depending on the temperature, switch a short-circuit circuit in the warm-up phase of the internal combustion engine, then switch to mixed operation when the internal combustion engine is heated accordingly, the coolant partly still through the short-circuit circuit and partly already via a cooler Heat exchanger is guided in the cooling circuit. In later normal operation, the coolant is then generally passed completely through the cooler in the cooling circuit. For this purpose, for example, DE 44 38 552 Cl, DE 44 38 237 Cl and DE 42 31 649 C2 are mentioned as generic control devices.
Die bekannten Thermostatventile reagieren auf Temperaturveränderungen jedoch sehr langsam. Darüber hinaus sind sie auf eine Regelgröße, nämlich eine Öffnungstemperatur, fixiert und besitzen zudem hohe Druckverluste.However, the known thermostatic valves react very slowly to changes in temperature. In addition, they are fixed to a controlled variable, namely an opening temperature, and also have high pressure losses.
Aus der DE 41 25 366 Cl ist ein 3/2-Wegeventil für Flüs- sigkeitskreisläufe in Fahrzeugen bekannt, das einen axialen Zulauf und zwei radiale Abläufe aufweist. Das vorbekannte Ventil wird als Verteilerventil oder Mischventil in einem dem Beheizen von Kraftfahr-zeugräumen dienenden Flüssigkeitskreislauf und in einem dem Kühlen vom Kraftfahrzeugräumen dienenden Flüssigkeitskreislauf verwendet. Darüber hinaus ist mit diesem Ventil auch ein Mischbetrieb zwischen Beheizen und Kühlen möglich.DE 41 25 366 Cl describes a 3/2-way valve for flow liquid circuits known in vehicles, which has an axial inlet and two radial outlets. The previously known valve is used as a distributor valve or mixing valve in a liquid circuit used for heating motor vehicle compartments and in a liquid circuit used for cooling motor vehicle compartments. This valve also enables mixed operation between heating and cooling.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Steuervorrichtung der eingangs erwähnten Art zu schaffen, die die genannten Nachteile des Standes der Technik nicht aufweist, insbesondere, die mehrere Regelgrößen ermöglicht und schnell und ohne große Druckverluste agiert.The present invention has for its object to provide a control device of the type mentioned that does not have the disadvantages of the prior art, in particular that allows multiple control variables and acts quickly and without large pressure drops.
Erfindungsgemäß wird diese Aufgabe durch die im kennzeichnenden Teil von Anspruch 1 genannten Merkmale gelöst.According to the invention this object is achieved by the features mentioned in the characterizing part of claim 1.
Die erfindungsgemäße Steuervorrichtung erlaubt schnelle Schaltzeiten und damit ein schnelles Reagieren auf Temperaturschwankungen. Darüber hinaus ist es möglich, daß an dem erfindungsgemäßen Stellventil vom Motor aus kennfeld- gesteuert die Regelgrößen des Stellventiles eingestellt werden. Dies kann z.B. auf einfache Weise durch einen elektrischen Antrieb für das Stellventil erfolgen.The control device according to the invention allows fast switching times and thus a quick reaction to temperature fluctuations. Furthermore, it is possible for the control variables of the control valve to be set on the control valve according to the invention from the engine in a map-controlled manner. This can e.g. done easily by an electric drive for the control valve.
Insgesamt gesehen, kann das Stellventil in seiner Betriebsweise sehr flexibel gehalten werden, wobei die Durchströmungen optimiert werden und Druckverluste in durchgeschalteten Zuständen auf ein Minimum reduziert werden können.Overall, the control valve can be kept very flexible in its mode of operation, the through-flows being optimized and pressure losses in switched-on states being reduced to a minimum.
Ein weiterer sehr wesentlicher Vorteil der erfindungsgemäßen Lösung besteht darin, daß durch das Schließen aller Teilkreisläufe bei Kaltstart bzw. im Warmlauf der Brennkraftmaschine eine deutliche Reduzierung von Kaltstar- temissionen erreicht werden kann. Durch das vollständige Schließen der Teilkreisläufe wird nicht einmal der Wassermantel der Brennkraftmaschine umgewälzt. Auf diese Weise kann sich die Brennkraftmaschine noch schneller aufheizen und emitiert weniger Kaltstartemissionen, insbesondere Kohlenwasserstoffe .Another very important advantage of the solution according to the invention is that by closing all sub-circuits during a cold start or when the internal combustion engine is warming up, a clear reduction in cold start emissions can be achieved. Through the full Closing the partial circuits does not even circulate the water jacket of the internal combustion engine. In this way, the internal combustion engine can heat up even more quickly and emits fewer cold start emissions, in particular hydrocarbons.
Durch die Möglichkeit einer kennfeldgeregelten Kühlung durch eine entsprechende Schaltstellung des Stellventiles, ist für jeden Betriebszustand eine optimale Kühlmitteltemperatur möglich, was ebenfalls zur Schonung der Brenn- kraftmaschine und zur Kraftstoffeinsparung beiträgt. Gleiches gilt für eine Reduzierung des Druckverlustes im Kühlkreislauf, wodurch die Antriebsleistung der Kühlmittelpumpe entsprechend reduziert werden kann, die durch eine Koppelung im Riementrieb den Kraftstoffverbrauch ebenfalls beeinflußt.The possibility of map-controlled cooling through a corresponding switching position of the control valve enables an optimal coolant temperature for every operating state, which also contributes to protecting the internal combustion engine and saving fuel. The same applies to a reduction in the pressure loss in the cooling circuit, as a result of which the drive power of the coolant pump can be reduced accordingly, which also influences the fuel consumption by coupling in the belt drive.
Eine weitere Kraftstoffersparnis und damit eine Reduzierung von Emissionen wird auch dadurch erreicht, daß es erfindungsgemäß möglich ist, bei sehr geringem Wasserbedarf und einer entsprechenden Lage des Stellventiles vor der Wasserpumpe durch eine Saugdrosselung die Leistungsaufnahme der Wasserpumpe zusätzlich zu reduzieren.A further fuel saving and thus a reduction in emissions is also achieved in that, according to the invention, it is possible to additionally reduce the power consumption of the water pump with a very low water requirement and a corresponding position of the control valve in front of the water pump by means of suction throttling.
Das erfindungsgemäße Stellventil kann an einer beliebigen Stelle in den Kühlkreislauf eingefügt werden. In vorteilhafter Weise kann man es z.B. in die Kühlmittelpumpe, vorzugsweise in den Saugmund der Pumpe oder in den Kühler integrieren. Auch eine Anordnung in oder an dem Steuergehäuse der Brennkraftmaschine ist möglich.The control valve according to the invention can be inserted at any point in the cooling circuit. It can advantageously be e.g. integrate in the coolant pump, preferably in the suction mouth of the pump or in the cooler. An arrangement in or on the control housing of the internal combustion engine is also possible.
Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen und aus dem nachfolgend anhand der Zeichnung prinzipmäßig beschriebenen Ausführungsbeispiel. Es zeigt :Advantageous refinements and developments of the invention result from the subclaims and from the exemplary embodiment described in principle below with reference to the drawing. It shows :
Fig. 1 einen Kühlkreislauf mit der erfindungsgemäßen Steuervorrichtung im Kaltstart bzw. Warmlauf, wobei alle Kreisläufe geschlossen sind,1 shows a cooling circuit with the control device according to the invention in cold start or warm-up, all circuits being closed,
Fig. 2 den Kühlkreislauf nach der Fig. 1, im Warmlauf, wobei der Kurzschlußkreislauf voll geöffnet ist,2, the cooling circuit according to FIG. 1, in warm-up, the short circuit being fully open,
Fig. 3 den Kühlkreislauf nach der Fig. 1 im Mischbetrieb mit einem Kühlmittelfluß durch den Kurzschlußkreislauf und den Kühlerkreislauf,3 shows the cooling circuit according to FIG. 1 in mixed operation with a coolant flow through the short circuit and the cooler circuit,
Fig. 4 den Kühlkreislauf nach der Fig. 1 mit vollständig geöffnetem Kühlerkreislauf,4 shows the cooling circuit according to FIG. 1 with the cooler circuit fully open,
Fig. 5 eine vereinfachte Ausführungsform des erfindungsgemäßen Stellventiles als Steuerglied in Stellung bei Kaltstart, entsprechend dem Kühlkreislauf nach der Fig. 1,5 shows a simplified embodiment of the control valve according to the invention as a control element in the cold start position, corresponding to the cooling circuit according to FIG. 1,
Fig. 6 das Stellventil nach der Fig. 5 in Stellung Warmlauf entsprechend dem Kühlkreislauf nach der Fig. 2,6 the control valve according to FIG. 5 in the warm-up position corresponding to the cooling circuit according to FIG. 2,
Fig. 7 das Stellventil nach der Fig. 5 in Stellung Mischbetrieb entsprechend dem Kühlkreislauf nach der Fig. 3, undFig. 7, the control valve of FIG. 5 in the mixed operation position corresponding to the cooling circuit of FIG. 3, and
Fig. 8 das Stellventil nach der Fig. 5 in Stellung Maximalkühlung entsprechend dem Kreislauf nach der Fig. 4.8 in the position of maximum cooling according to the circuit of FIG. 4th
Grundsätzlich ist der in den Figuren 1 bis 4 dargestellte Kühlkreislauf von bekannter Art, weshalb nachfolgend nur auf die für die Erfindung wesentlichen Bauteile und Kühl- mittelströmungen näher eingegangen wird.Basically, the cooling circuit shown in FIGS. 1 to 4 is of a known type, which is why only the components and cooling elements essential for the invention are described below. medium flows is discussed in more detail.
Eine durch einen Kühlkreislauf gekühlte Brennkraftmaschine 1 ist an einen Kühlerkreislauf 2, in welchem sich ein Kühler 3 als Wärmetauscher befindet, und an einen Kurzschluß- . kreislauf 4 angeschlossen. An einer Einmündungsstelle des Kurzschlußkreislaufes 4 in den Kühlerkreislauf 2 befindet sich ein Stellventil 5 als Steuerglied zur Aufteilung des Kühlmittelstromes in dem Kühlkreislauf. Zwischen der Brennkraftmaschine 1 und dem Stellventil 5 befindet sich eine Kühlmittelpumpe 6, durch die das Kühlmittel umgewälzt wird.An internal combustion engine 1 cooled by a cooling circuit is connected to a cooler circuit 2, in which a cooler 3 is located as a heat exchanger, and to a short circuit. circuit 4 connected. At a junction of the short circuit 4 in the cooler circuit 2 there is a control valve 5 as a control element for dividing the coolant flow in the cooling circuit. Between the internal combustion engine 1 and the control valve 5 there is a coolant pump 6 through which the coolant is circulated.
Vom Kühlerkreislauf 2 zweigt ein Heizungskreislauf 7 ab, in welchem sich ein Regelventil 8, eine Heizung 9 und eine Pumpe 10 befindet. Der Heizungskreislauf 7 wird nach dem Stellventil 5 saugseitig der Kühlmittelpumpe 6 zugeführt.A heating circuit 7 branches off from the cooler circuit 2 and contains a control valve 8, a heater 9 and a pump 10. The heating circuit 7 is fed to the coolant pump 6 on the suction side after the control valve 5.
Für das Stellventil 5 ist eine Ausgestaltung zu wählen, die vier Stellungen ermöglicht, nämlich eine vollständige Sperrstellung, eine Stellung, in der das Kühlmittel, im Allgemeinen Wasser, ausschließlich über den Kurzschlußkreislauf 4 geführt wird, eine Stellung, in der das Kühlmittel ausschließlich über den Kühlerkreislauf 2 geführt wird und eine weitere Stellung, in der ein Mischbetrieb, d.h. jeweils eine Teilöffnung des Kurzschlußes 4 und des Kühlerkreislaufes 2 gegeben ist.For the control valve 5, a configuration is to be selected which enables four positions, namely a complete blocking position, a position in which the coolant, in general water, is conducted exclusively via the short circuit 4, a position in which the coolant exclusively via the Radiator circuit 2 is performed and another position in which a mixed operation, ie a partial opening of the short circuit 4 and the cooler circuit 2 is given.
Die Fig. 1 zeigt den Kühlkreislauf, in welchem sich das Stellventil 5 in einer Sperrstellung befindet, so daß sowohl der Kurzschlußkreislauf 4 als auch der Kühlerkreislauf 2 abgesperrt sind. Damit keine Umwälzung des Kühlmittels im Wassermantel der Brennkraftmaschine 1 stattfindet, ist selbstverständlich in dieser Stellung auch dafür zu sorgen, daß das Regelventil 8 für den Heizungskreislauf 7 ebenfalls geschlossen ist. In dieser Stellung liegt eine Saugdrosselung an der Kühlmittelpumpe 6 mit einem entsprechend reduzierten Energieverbrauch vor. Hierfür ist lediglich dafür zu sorgen, daß die Kühlmittelpumpe 6 für einen Betrieb in Saugdrosselung ausgeführt ist.Fig. 1 shows the cooling circuit, in which the control valve 5 is in a blocking position, so that both the short-circuit circuit 4 and the radiator circuit 2 are shut off. So that there is no circulation of the coolant in the water jacket of the internal combustion engine 1, it is of course also to be ensured in this position that the control valve 8 for the heating circuit 7 is also closed. In this position there is a suction throttling on the coolant pump 6 with a correspondingly reduced energy consumption. It is only necessary to ensure that the coolant pump 6 is designed for operation in suction throttling.
Gemäß Schaltung nach der Fig. 2 befindet sich das Stellventil 5 in einer Position, in der der Kühlerkreislauf 2 abgesperrt, der Kurzschlußkreislauf 4 jedoch geöffnet ist.According to the circuit according to FIG. 2, the control valve 5 is in a position in which the cooler circuit 2 is shut off, but the short-circuit circuit 4 is open.
Gemäß Fig. 3 ist durch eine entsprechende Stellung des Stellventiles 5 ein Mischbetrieb gegeben, wobei eine teilweise Verbindung zu dem Kurzschlußkreislauf 4 und dem Kühlerkreislauf 2 vorhanden ist.According to FIG. 3, mixed operation is provided by a corresponding position of the control valve 5, a partial connection to the short-circuit circuit 4 and the cooler circuit 2 being present.
Fig. 4 stellt die Schaltung dar, in der im Normalbetrieb eine vollständige Kühlung der Brennkraftmaschine 1 durch einen Kreislauf des Kühlmittels über den Kühlerkreislauf 2 erfolgt, wobei der Kurzschlußkreislauf 4 geschlossen ist.4 shows the circuit in which, in normal operation, the internal combustion engine 1 is completely cooled by a circuit of the coolant via the cooler circuit 2, the short-circuit circuit 4 being closed.
Im Bedarfsfall kann durch eine Schalteinrichtung (nicht dargestellt) auch dafür gesorgt werden, daß der Durchfluß von Kühlmittel durch die Brennkraftmaschine 1 unterbrochen wird.If necessary, a switching device (not shown) can also ensure that the flow of coolant through the internal combustion engine 1 is interrupted.
In den Schaltstellungen nach den Figuren 2 bis 4 kann das Regelventil 8 für eine Heizung des Fahrgastinnenraumes des Fahrzeuges teilweise oder auch ganz geöffnet werden.In the switch positions according to FIGS. 2 to 4, the control valve 8 for heating the passenger compartment of the vehicle can be partially or completely opened.
Das Stellventil 5 kann auf beliebige Weise, z.B. elektromotorisch, angetrieben werden. Auf diese Weise läßt es sich auch beliebig bezüglich seiner Stellungen steuern. Für einen optimalen Betrieb wird man hierfür eine Regeleinrichtung vorsehen, wobei motorkennfeidgesteuert die Regelgrößen eingestellt werden.The control valve 5 can be in any way, e.g. to be driven by an electric motor. In this way it can also be controlled with regard to its positions. For optimal operation, a control device will be provided for this, the controlled variables being set under engine control.
Um Schäden an der Brennkraftmaschine zu vermeiden, wenn Störungen im Kühlkreislauf auftreten, wie z.B. ein Ausfallen des Antriebes für das Stellventil, der durch einen Ausfall der Stromversorgung verursacht sein könnte, kann in einer derartigen Notsituation eine Freischaltung des Kühlerkreislaufes 2 erfolgen. Dies läßt sich auf einfache Weise z.B. dadurch realisieren, daß durch eine entsprechende Federrückstellung dafür gesorgt wird, daß das Stellventil 5 in diesem Fall in eine Position gebracht wird, in der der Kühlerkreislauf 2 automatisch geöffnet wird.To avoid damage to the internal combustion engine if Malfunctions in the cooling circuit, such as a failure of the drive for the control valve, which could be caused by a failure of the power supply, can result in the cooler circuit 2 being activated in such an emergency situation. This can be achieved in a simple manner, for example, by ensuring that the control valve 5 is brought into a position in which the cooler circuit 2 is opened automatically by a corresponding spring return.
In den Figuren 5 bis 8 ist lediglich beispielsweise eine Ausgestaltung eines Stellventiles 5 prinzipmäßig dargestellt. Wie ersichtlich, ist es derart ausgebildet, daß es einen Drehschieber 11 in Form einer Hülse aufweist, der in einem zylinderförmigen Ventilgehäuse 12 um seine Längsachse drehbar angeordnet ist. Der Drehschieber 11 ist mit einem axialen Sammelanschluß 13 auf einer Stirnseite versehen, während er auf der anderen Seite geschlossen und dort mit einer nicht dargestellten Antriebseinrichtung zu dessen Verschwenkung um seine Längsachse versehen ist. Das Ventilgehäuse 12 ist auf der von der nicht dargestellten Antriebseinrichtung abgewandten Seite ebenfalls verschlossen.In Figures 5 to 8, only one embodiment of a control valve 5 is shown in principle, for example. As can be seen, it is designed in such a way that it has a rotary slide valve 11 in the form of a sleeve which is arranged in a cylindrical valve housing 12 so as to be rotatable about its longitudinal axis. The rotary valve 11 is provided with an axial common connection 13 on one end face, while it is closed on the other side and there is provided with a drive device, not shown, for pivoting it about its longitudinal axis. The valve housing 12 is also closed on the side facing away from the drive device, not shown.
Der Drehschieber 11 weist in seiner Umfangswand eine Steueröffnung 14 auf. Entsprechend der gewählten Ausgestaltung erstreckt sich die Steueröffnung 14 des Drehschiebers 11 über einen Umfangsbereich von mehr als 180°, vorzugsweise ca. 190 bis 200° .The rotary valve 11 has a control opening 14 in its peripheral wall. According to the selected configuration, the control opening 14 of the rotary slide valve 11 extends over a circumferential range of more than 180 °, preferably approximately 190 to 200 °.
Das Ventilgehäuse 12 besitzt in seiner zylinderförmigen Umfangswand je eine Öffnung für einen Anschluß 15 zu dem Kurzschlußkreislauf 4 und einen Anschluß 16 zu dem Kühlerkreislauf 2. Bei dem dargestellten Ausführungsbeispiel stellen die Anschlüsse 15 und 16 jeweils Zuläufe dar, während der Sammelanschluß 13 den Ablauf zu der Kühlmittel- pumpe 6 bildet.The valve housing 12 has in its cylindrical peripheral wall each an opening for a connection 15 to the short circuit 4 and a connection 16 to the cooler circuit 2. In the illustrated embodiment, the connections 15 and 16 each represent inlets, while the common connection 13 the outlet to the Coolant pump 6 forms.
Die Fig. 5 zeigt die Stellung des Drehschiebers 11, in welcher gemäß Fig. 1 sowohl der Kühlerkreislauf 2 als auch der Kurzschlußkreislauf 4 abgeschlossen sind.5 shows the position of the rotary valve 11, in which, according to FIG. 1, both the cooler circuit 2 and the short-circuit circuit 4 are completed.
Fig. 6 zeigt die Stellung des Drehschiebers 11, in der entsprechend der Schaltung nach der Fig. 2 das Kühlmittel in dem Kurzschlußkreislauf 4 zirkuliert. Dabei ist die Position des Drehschiebers 11 so gewählt, daß eine vollständige Öffnung des Anschlusses 15 gegeben ist. Entsprechend dem Ausführungsbeispiel ist jedoch auch nur eine Teilöffnung mit einem entsprechend gedrosselten Umlauf des Kühlmittels durch den Kurzschlußkreislauf 4 möglich. Auf diese Weise läßt sich eine sehr feinfühlige Regelung mit einem kontinuierlichen Verlauf von einer Sperrstellung gemäß Fig. 5 bis in eine vollständige Offenstellung gemäß Fig. 6 erreichen.Fig. 6 shows the position of the rotary valve 11, in which, according to the circuit of FIG. 2, the coolant circulates in the short circuit 4. The position of the rotary valve 11 is selected so that the port 15 is completely opened. According to the exemplary embodiment, however, only a partial opening with a correspondingly throttled circulation of the coolant through the short circuit 4 is possible. In this way, a very sensitive control with a continuous course from a blocking position according to FIG. 5 to a completely open position according to FIG. 6 can be achieved.
Fig. 7 zeigt einen Mischbetrieb mit einem Kühlmittelstrom sowohl über den Kurzschlußkreislauf 4 als auch über den Kühlerkreislauf 2. Auch hier ist es nicht erforderlich, daß eine gleichmäßige Aufteilung erfolgt, sondern es sind auch Zwischenstellungen mit unterschiedlichen Strömungsmengen durch den Kühlerkreislauf 2 und den Kurzschlußkreislauf 4 möglich.Fig. 7 shows a mixed operation with a coolant flow both via the short circuit 4 and the cooler circuit 2. Here, too, it is not necessary for the distribution to be uniform, but there are also intermediate positions with different flow rates through the cooler circuit 2 and the short circuit 4 possible.
Fig. 8 zeigt einen Kühlkreislauf mit einer nahezu vollständigen alleinigen Strömung über den Kühlerkreislauf 2. Der Kurzschlußkreislauf 4 ist geschlossen. Auch hier ist ein gedrosselter Betrieb über den Kühlerkreislauf 2 durch eine entsprechende Zwischenstellung des Drehschiebers 11 mit einer teilweisen Öffnungsfreigabe des Anschlusses 16 möglich.Fig. 8 shows a cooling circuit with an almost complete sole flow through the cooler circuit 2. The short circuit 4 is closed. Throttled operation via the cooler circuit 2 is also possible here by a corresponding intermediate position of the rotary valve 11 with a partial opening of the connection 16.
Die Ausführungsformen für das Stellventil 5 können sehr flexibel gehalten werden. So sind z.B. Drehschieber 11 mit axialen, halbaxialen und/oder radialen Stutzen bzw. Anschlüssen möglich. Ebenso können statt einem Drehschieber 11 auch andere Steuerglieder verwendet werden.The embodiments for the control valve 5 can be kept very flexible. For example, rotary valve 11 with axial, semi-axial and / or radial connections or connections possible. Likewise, other control members can be used instead of a rotary valve 11.
Auch die dargestellte Lage des Stellventiles 5 auf der . Saugseite der Kühlmittelpumpe 6 stellt nur eine mögliche Anordnung dar. So ist z.B. auch eine Anordnung auf der Druckseite der Kühlmittelpumpe 6 zwischen dieser und der Brennkraftmaschine 1 oder auch nach der Brennkraftmaschine möglich. In diesem Falle dient der axiale Sammelanschluß 13 als Zufuhr zu dem Stellventil 5 und die Anschlüsse 15 und 16 dienen zur Abfuhr des Kühlmittels zu dem Kühlerkreislauf 2 und dem Kurzschlußkreislauf 4. The position of the control valve 5 shown on the. The suction side of the coolant pump 6 is only one possible arrangement. an arrangement on the pressure side of the coolant pump 6 between the latter and the internal combustion engine 1 or also after the internal combustion engine is possible. In this case, the axial collective connection 13 serves as a supply to the control valve 5 and the connections 15 and 16 serve to discharge the coolant to the cooler circuit 2 and the short-circuit circuit 4.

Claims

Pat-.en tan Sprüche Pat-.en tan sayings
1. Steuervorrichtung für einen Kühlkreislauf einer Brennkraftmaschine, mit einem Kühler als Wärmetauscher, mit einer Kühlmittelpumpe und mit einem den Kühlkreislauf regelnden Steuerglied, wobei der Kühlkreislauf einen Kühlerkreislauf, der die Brennkraftmaschine, die Kühlmittelpumpe und den Kühler umfaßt, und einen Kurzschlußkreislauf, der die Brennkraftmaschine und die Kühlmittelpumpe umfaßt, aufweist, dadurch ge kenn z e i chne t , daß das Steuerglied ein Stellventil (5) aufweist, mit je einem Anschluß (15,16) für den Kühlerkreislauf (2) und den Kurzschlußkreislauf (4), und einen Sammelanschluß (13) zur Zu- oder Abfuhr des Kühlmittels zu dem Kühlerkreislauf (2) und dem Kurzschlußkreislauf (4) bzw. aus dem Kühlerkreislauf (2) und dem Kurzschlußkreislauf (4), wobei das Stellventil (5) mit einem Ventilglied (11) versehen ist, durch das wahlweise eine Sperrstellung für den Kühlerkreislauf (2) und den Kurzschlußkreislauf (4) , eine Verbindung zwischen dem Kühlerkreislauf (2) oder den Kurzschlußkreislauf (4) und dem Sammelanschluß (13) oder eine Verbindung zwischen dem Kühlerkreislauf (2) und dem Kurzschlußkreislauf (4) zu dem Sammelanschluß (13) als Mischbetrieb geschaffen wird.1. Control device for a cooling circuit of an internal combustion engine, having a cooler as a heat exchanger, having a coolant pump and having a control element which regulates the cooling circuit, the cooling circuit comprising a cooler circuit which comprises the internal combustion engine, the coolant pump and the cooler, and a short-circuit circuit which represents the internal combustion engine and comprises the coolant pump, characterized in that the control member has a control valve (5), each with a connection (15, 16) for the cooler circuit (2) and the short-circuit circuit (4), and a common connection ( 13) for supplying or discharging the coolant to the cooler circuit (2) and the short circuit (4) or from the cooler circuit (2) and the short circuit (4), the control valve (5) being provided with a valve member (11) , through the optionally a blocking position for the cooler circuit (2) and the short circuit (4), a connection between the cooler rkreislauf (2) or the short circuit (4) and the common connection (13) or a connection between the cooler circuit (2) and the short circuit (4) to the common connection (13) is created as a mixed operation.
2. Steuervorrichtung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß das Ventilglied (11) elektromotorisch angetrieben ist.2. Control device according to claim 1, d a d u r c h g e k e n n z e i c h n e t that the valve member (11) is driven by an electric motor.
3. Steuervorrichtung nach Anspruch 1 oder 2, d a d u r c h g e k e n n z e i c h n e t , daß das Ventilglied als Drehschieber (11) ausgebildet ist. l. Steuervorrichtung nach Anspruch 3, dadur ch ge kenn z e i chnet , daß die Anschlüsse (15,16) für den Kühlerkreislauf (2) und den Kurzschlußkreislauf (4) in die Umfangswand des Drehschiebers (11) münden, und daß der Sammelanschluß (13) axial in dem Drehschieberinneren verläuft.3. Control device according to claim 1 or 2, characterized in that the valve member is designed as a rotary slide valve (11). l. Control device according to claim 3, characterized in that the connections (15, 16) for the cooler circuit (2) and the short circuit (4) open into the peripheral wall of the rotary valve (11), and that the collecting connection (13) is axial runs inside the rotary valve.
). Steuervorrichtung nach Anspruch 4, dadur ch ge kenn z e i chne t , daß die Anschlüsse (15,16) für den Kühlerkreislauf (2) und den Kurzschlußkreislauf (4) in der Umfangswand die Zuläufe sind und der Sammelanschluß (13) zur zentralen Abfuhr vorgesehen ist.). Control device according to claim 4, characterized in that the connections (15, 16) for the cooler circuit (2) and the short-circuit circuit (4) in the peripheral wall are the inlets and the collective connection (13) is provided for central discharge .
Steuervorrichtung nach einem der Ansprüche 1 bis 5, dadurch ge kennz e i chnet , daß eine Schalteinrichtung zur Unterbrechung des Durch- flußes von Kühlmittel durch die Brennkraftmaschine (1) vorgesehen ist.Control device according to one of Claims 1 to 5, characterized in that a switching device is provided for interrupting the flow of coolant through the internal combustion engine (1).
Steuervorrichtung nach einem der Ansprüche 1 bis 6, dadur ch g e kenn z e i chne t , daß durch den Drehschieber (11) beide Anschlüsse von Kühlerkreislauf (2) und Kurzschlußkreislauf (4) verschließbar sind.Control device according to one of Claims 1 to 6, so that the rotary valve (11) can be used to close both connections of the cooler circuit (2) and the short-circuit circuit (4).
Steuervorrichtung nach einem der Ansprüche 1 bis 7, dadurch ge kenn z e i chnet , daß das Stellventil (5) in die Kühlmittelpumpe (6), insbesondere in deren Saugbereich, integriert ist. Steuervorrichtung nach einem der Ansprüche 1 bis 8, dadurch ge kennz e i chnet , daß das Stellventil (5) mit einem Notschaltglied versehen ist, durch das es in einer Notsituation, insbesondere bei Ausfall der Stromversorgung derart verstellt wird, daß eine Verbindung zwischen dem Kühlerkreislauf (2) und dem Sammelanschluß (13) gegeben ist. Control device according to one of claims 1 to 7, characterized in that the control valve (5) is integrated in the coolant pump (6), in particular in its suction area. Control device according to one of Claims 1 to 8, characterized in that the control valve (5) is provided with an emergency switching element by which it is adjusted in an emergency situation, in particular in the event of a power failure, in such a way that a connection between the cooler circuit ( 2) and the hunt group (13) is given.
PCT/EP1999/007145 1998-10-27 1999-09-25 Control device for the cooling circuit of an internal combustion engine WO2000025007A1 (en)

Priority Applications (2)

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EP99948869A EP1125040A1 (en) 1998-10-27 1999-09-25 Control device for the cooling circuit of an internal combustion engine
US09/841,318 US20010042525A1 (en) 1998-10-27 2001-04-24 Control arrangement for a cooling circuit of an internal combustion engine

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DE19849492.0 1998-10-27

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DE19849492A1 (en) 2000-05-11
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US20010042525A1 (en) 2001-11-22

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