EP0128365B2 - Cooling device for an internal-combustion engine - Google Patents

Cooling device for an internal-combustion engine Download PDF

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Publication number
EP0128365B2
EP0128365B2 EP84105274A EP84105274A EP0128365B2 EP 0128365 B2 EP0128365 B2 EP 0128365B2 EP 84105274 A EP84105274 A EP 84105274A EP 84105274 A EP84105274 A EP 84105274A EP 0128365 B2 EP0128365 B2 EP 0128365B2
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EP
European Patent Office
Prior art keywords
fan
temperature
valve
combustion engine
thermostatic valve
Prior art date
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EP84105274A
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German (de)
French (fr)
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EP0128365B1 (en
EP0128365A3 (en
EP0128365A2 (en
Inventor
Roland Saur
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Behr-Thomson-Dehnstoffregler Verwaltungs-Gmbh Te K
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Behr Thomson Dehnstoffregler GmbH and Co
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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
    • F01P7/02—Controlling of coolant flow the coolant being cooling-air
    • F01P7/08—Controlling of coolant flow the coolant being cooling-air by cutting in or out of pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • 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
    • F01P2025/00—Measuring
    • F01P2025/08—Temperature
    • F01P2025/13—Ambient temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/08—Temperature
    • F01P2025/40—Oil temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/08—Temperature
    • F01P2025/44—Outlet manifold temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/08—Temperature
    • F01P2025/50—Temperature using two or more temperature sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/60—Operating parameters
    • F01P2025/62—Load
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/60—Operating parameters
    • F01P2025/64—Number of revolutions

Definitions

  • the thermostatic valve influences the coolant temperature and thus also the temperature of the internal combustion engine by determining the temperature level through the temperature at which it releases the connection to the cooler.
  • the fan assigned to the radiator is only switched on when it is needed, i.e. when the coolant temperature and thus the engine temperature exceed a certain level. It is customary to operate the fan in several stages, the lowest power level of the fan being associated with a lower coolant temperature. As the coolant temperature rises, the fan is operated at higher output.
  • the invention has for its object to design the device of the type mentioned so that the operating temperature of the internal combustion engine can be changed and that this is not associated with increased power consumption.
  • This design enables the engine temperature to be set via different opening temperatures of the thermostatic valve, in particular to optimize the work of the internal combustion engine. For example, it can be provided that in winter the thermostatic valve is adjusted depending on low outside temperatures so that the internal combustion engine works at a higher temperature. In order to prevent the effect of the temperature increase from being partially canceled out and also not to cause any increased power consumption, it is then provided that the fan assigned to the cooler is at the lower coolant temperature at which it would normally start if the internal combustion engine operated at the lower temperature level will not respond.
  • Fig. 2 is a circuit diagram for an electrical actuation of the setting of the thermostatic valve and the actuation of an electrically driven fan for a cooler during the switching position at a lower temperature level and

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Temperature-Responsive Valves (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zum Kühlen eines Verbrennungsmotors insbesondere eines Kraftfahrzeuges, mit einem den Kühlmittelfluß von und zu dem Verbrennungsmotor über einen direkten Rücklauf oder über einen Kühler steuernden Thermostatventil und mit wenigstens einem dem Kühler zugeordneten, abhängig von wenigstens einer niedrigeren und einer höheren Kühlmitteltemperatur in wenigstens zwei Leistungsstufen betreibbaren Lüfter.The invention relates to a device for cooling an internal combustion engine, in particular a motor vehicle, with a thermostatic valve controlling the coolant flow to and from the internal combustion engine via a direct return line or via a cooler and with at least one cooler associated with the cooler, depending on at least one lower and one higher coolant temperature operable fan at least two power levels.

Bei einer Vorrichtung der eingangs genannten Art (DE-A- 28 06 708) beeinflußt das Thermostatventil die Kühlmitteltemperatur und damit auch die Temperatur des Verbrennungsmotors, indem es durch die Temperatur, bei welcher es die Verbindung zu dem Kühler freigibt, das Temperaturniveau festlegt. Um den Verbrauch des Verbrennungsmotors zu reduzieren, wird vorgesehen, daß der dem Kühler zugeordnete Lüfter nur dann eingeschaltet wird, wenn er benötigt wird, d.h. wenn die Kühlmitteltemperatur und damit auch die Motortemperatur einen bestimmten Wen übersteigen. Dabei ist es üblich, den Lüfter in mehreren Stufen zu betreiben, wobei die niedrigste Leistungsstufe des Lüfters einer niedrigeren Kühlmitteltemperatur zugeordnel ist. Mit Erhöhung der Kühlmitteltemperatur wird dann der Lüfter mit höherer Leistung betrieben.In a device of the type mentioned (DE-A-28 06 708), the thermostatic valve influences the coolant temperature and thus also the temperature of the internal combustion engine by determining the temperature level through the temperature at which it releases the connection to the cooler. In order to reduce the consumption of the internal combustion engine, it is provided that the fan assigned to the radiator is only switched on when it is needed, i.e. when the coolant temperature and thus the engine temperature exceed a certain level. It is customary to operate the fan in several stages, the lowest power level of the fan being associated with a lower coolant temperature. As the coolant temperature rises, the fan is operated at higher output.

Der Erfindung liegt die Aufgabe zugrunde, die Vorrichtung der eingangs genannten Art so auszubilden, daß die Betriebstemperatur des Verbrennungsmotors verändert werden kann und daß dies dennoch nicht mit einem erhöhten Leistungsverbrauch verbunden ist.The invention has for its object to design the device of the type mentioned so that the operating temperature of the internal combustion engine can be changed and that this is not associated with increased power consumption.

Diese Aufgabe wird dadurch gelöst, daß das Thermostatventil auf wenigstens zwei unterschiedliche Öffnungstemperaturen einstellbar ist, und daß mit einem Verstellen des Thermostatventils auf die höhere Öffnungstemperatur das Einschalten des Lüfters auf die der niedrigeren Kühlmitteltemperatur zugeordnete Leistungsstufe gesperrt wird.This object is achieved in that the thermostatic valve can be set to at least two different opening temperatures, and in that the adjustment of the thermostatic valve to the higher opening temperature blocks the switching on of the fan to the power level assigned to the lower coolant temperature.

Durch diese Aus-bildung wird ermöglicht, über unterschiedliche Öffnungstemperaturen des Thermostatventils die Motortemperatur insbesondere zur Optimierung der Arbeit des Verbrennungsmotors einzustellen. Beispielsweise kann vorgesehen werden, daß im Winter abhängig von niedrigen Außentemperaturen das Thermostatventil so verstellt wird, daß der Verbrennungsmotor mit einer höheren Temperatur arbeitet. Um zu verhindern, daß der Effekt der Temperaturerhöhung teilweise wieder aufgehoben wird, und um außerdem auch keinen erhöhten Leistungsverbrauch zu verursachen, wird dabei dann vorgesehen, daß der dem Kühler zugeordnete Lüfter bei der niedrigeren Kühlmitteltemperatur, bei der er üblicherweise anlaufen würde, wenn der Verbrennungsmotor auf dem niedrigeren Temperaturniveau betrieben wird, nicht anspricht.This design enables the engine temperature to be set via different opening temperatures of the thermostatic valve, in particular to optimize the work of the internal combustion engine. For example, it can be provided that in winter the thermostatic valve is adjusted depending on low outside temperatures so that the internal combustion engine works at a higher temperature. In order to prevent the effect of the temperature increase from being partially canceled out and also not to cause any increased power consumption, it is then provided that the fan assigned to the cooler is at the lower coolant temperature at which it would normally start if the internal combustion engine operated at the lower temperature level will not respond.

Bei einer vorteilhaften Ausführungsform der Erfindung ist vorgesehen, daß in dem elektrischen Schaltkreis für ein elektrisches Stellglied zum Verstellen des Thermostatventils ein von dem gleichen Signalgeber gesteuertes Relais angeordnet ist, das einen Öffner betätigt, der in der elektrischen Zuleitung für die der niedrigeren Kühlmitteltemperatur zugeordneten Leistungsstufe des elektrisch angetriebenen Lüfters liegt.In an advantageous embodiment of the invention it is provided that in the electrical circuit for an electrical actuator for adjusting the thermostatic valve, a relay controlled by the same signal transmitter is arranged, which actuates an opener, which in the electrical supply line for the lower coolant temperature associated power level electrically driven fan.

Bei einer besonders vorteilhaften Weiterbildung der Erfindung enthält das Thermostatventil ein thermostatisches Arbeitselement, dessen Gehäuse einen Ventilteller eines zu dem Kühler führenden Ventils trägt und dessen bei Erwärmung ausfahrende Arbeitskolben einem Widerlager gegenüberliegt, dessen Position derart veränderbar ist, daß der Abstand des Abstützpunktes für den Arbeitskolben zu dem Gehäuse mit dem Ventilteller einstellbar ist. Durch diese Ausgestaltung wird die Möglichkeit eröffnet, ein Thermostatventil einer üblichen Bauart zu verwenden, ohne daß an diesem, gegebenenfalls mit Ausnahme einer Verlängerung des Arbeitskolbens, funktionelle Änderungen vorgenommen werden müssen.In a particularly advantageous development of the invention, the thermostatic valve contains a thermostatic working element, the housing of which carries a valve plate of a valve leading to the cooler and whose working piston extends when heated and is opposite an abutment whose position can be changed such that the distance of the support point for the working piston increases the housing is adjustable with the valve disk. This configuration opens up the possibility of using a thermostatic valve of a conventional type without having to make any functional changes to it, possibly with the exception of an extension of the working piston.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung der in der Zeichnung dargestellten Ausführungsform.Further features and advantages of the invention result from the following description of the embodiment shown in the drawing.

Fig. 1 zeigt einen Schnitt durch ein Thermostatventil mit einstellbarer Öffnungstemperatur,1 shows a section through a thermostatic valve with adjustable opening temperature,

Fig. 2 einen Schaltplan für eine elektrische Betätigung der Einstellung des Thermostatventils und die Betätigung eines elektrisch angetriebenen Lüfters für einen Kühler während der Schaltstellung bei niedrigerem Temperaturniveau undFig. 2 is a circuit diagram for an electrical actuation of the setting of the thermostatic valve and the actuation of an electrically driven fan for a cooler during the switching position at a lower temperature level and

Fig. 3 den Schaltplan nach Fig. 2 in der Schaltstellung bei erhöhtem Temperaturniveau des Verbrennungsmotors.Fig. 3 shows the circuit diagram of Fig. 2 in the switching position at an elevated temperature level of the internal combustion engine.

In Fig. 1 ist ein Thermostatventil 32 dargestellt, das die Kühlmittelströmung eines Verbrennungsmotors von einem Zulauf 17 zu einem direkten Rücklauf 18 und/oder zu einem Anschlußstutzen 15 steuert, welcher in nicht naher dargestellter Weise mit einem Wärmetauscher, einem sogenannten Kühler, verbunden ist. Der Kühler ist dann seinerseits wieder an einen Einlauf des Verbrennungsmotors angeschlossen. Das Thermostatventil besitzt ein thermostatisches Arbeitselement 3, das aus einem einen Dehnstoff enthaltenden Gehäuse und einem bei Erwärmung aus dem Gehäuse ausfahrenden Arbeitskolben 2 besteht. Entsprechend der Temperatur verändert der Dehnstoff des Arbeitselementes sein Volumen, so daß der Arbeitskolben 2 ausgetrieben oder bei einer Abkühlung auch wieder in das Gehäuse hineingedrückt wird. Das Gehause des Arbeitselementes 3 ist mit einem Ventilteller 4 beispielsweise durch Aufpressen oder Aufbördeln o.dgl. fest verbunden, der mit einem konischen Rand einem einen rechten Winkel bildenden Ventilsitz 16 zugeordnet ist, der von dem Anschlußstutzen 15 gebildet wird. Das aus dem Ventilteller 4 und dem Ventilsitz 16 gebildete ventil verschließt oder öffnet die Verbindung zwischen dem Zulauf 17 und dem zu dem Kühler führenden Anschlußstutzen 15. Der Ventilteller 4 ist mit einer konisch gewickelten Druckfeder 19 in der dargestellten Schließstellung gehalten. Auf einer Gleitführung des Gehäuses des Arbeitselementes 3 ist ein weiterer Ventilteller 20 angeordnet, der einem Ventilsitz 21 des Rücklaufs 18 zugeordnet ist. Der Ventilteller 20 ist mit einer an dem Gehäuse des Arbeitselementes 3 geführten Druckfeder 22 belastet.In Fig. 1, a thermostatic valve 32 is shown, which controls the coolant flow of an internal combustion engine from an inlet 17 to a direct return 18 and / or to a connecting piece 15, which is connected in a manner not shown with a heat exchanger, a so-called cooler. The cooler is then in turn connected to an inlet of the internal combustion engine. The thermostatic valve has a thermostatic working element 3, which consists of a housing containing an expansion material and a working piston 2 extending out of the housing when heated. The volume of the expansion element of the working element changes in accordance with the temperature, so that the working piston 2 is expelled or, when it cools down, is also pressed back into the housing. The housing of the working element 3 is with a valve plate 4, for example by pressing or Flaring or the like firmly connected, which is associated with a conical edge forming a right angle valve seat 16, which is formed by the connecting piece 15. The valve formed from the valve plate 4 and the valve seat 16 closes or opens the connection between the inlet 17 and the connecting piece 15 leading to the cooler. The valve plate 4 is held in the closed position shown with a conically wound compression spring 19. A further valve plate 20, which is assigned to a valve seat 21 of the return 18, is arranged on a sliding guide of the housing of the working element 3. The valve plate 20 is loaded with a compression spring 22 guided on the housing of the working element 3.

In der dargestellten Stellung strömt das Kühlmittel über den zwischen den beiden Ventilen 4, 16 und 20, 21 befindlichen Zulauf 17 zu und über den direkten Rücklauf 19 ab, zurück wieder zu dem Verbrennungsmotor. Wenn das Kühlmittel eine höhere Temperatur aufweist, dehnt sich der Dehnstoff des Arbeitselementes 3 aus, so daß der Arbeitskolben 2 aus dem Gehäuse des Arbeitselementes 3 ausfährt und sich an einem Widerlager 5 abstützt. Bei einer weiteren Ausdehnung und damit verbundenem Ausfahren des Arbeitskolbens wird das Gehäuse des Arbeitselementes 3 mit dem Ventilteller 4 und dem Ventilteller 20 verschoben. Dabei wird zunächst das Ventil 4, 16 geöffnet und danach das Ventil 20, 21 geschlossen. Das Widerlager 5 für den Arbeitskolben 2 des thermostatischen Arbeitselementes 3, das sich in einem Ansatz 26 des Anschlußstutzens 15 befindet, ist derart verstellbar, daß durch seine Verstellung die Öffnungstemperatur des Thermostatventils 32 verändert werden kann. Das Widerlager 5 ist ein etwa quer zur Achse des Arbeitskolbens 2 verschiebbarer Körper, der in dem Ansatz 26 gegen die Wirkung einer Druckfeder 25 verschiebbar geführt ist. Das verschieben des Widerlagers 5 erfolgt durch ein Stellorgan 9, das in den Ansatz 26 mit einem Ansatz 27 eingeschraubt ist und das mit einem Kolben 23 das Widerlager 5 entgegen der Wirkung der Feder 25 verschieben kann. Das Widerlager 5 ist mit einer schrägen Abstützfläche 13 versehen, die mit einer Neigung zur Bewegungsrichtung des Arbeitskolbens 2 verläuft. Das Widerlager 5 ist derart verschiebbar, daß die von ihm auf der Abstützfläche 13 gebildeten Abstützpunkte jede Stellung zwischen dem Wert X der Fig. 1 einnehmen können. In der dargestellten Stellung ist das Widerlager 5 so eingestellt, daß der Arbeitskolben 2 bei einer Ausdehnung des Dehnstoffes erst einen Leerweg von der Größe X zurücklegen muß, bevor er sich an die schräge Fläche 13 des Widerlagers 5 anlegt und bei weiterem Ausfahren das Ventil 4, 16 öffnet und das Ventil 20, 21 schließt. Der Verbrennungsmotor wird bei dieser Einstellung mit einer erhöhten Temperatur betrieben. Bei entsprechender Verschiebung des Widerlagers 5 in die andere Extremstellung öffnet das Ventil 4, 16 früher, d.h. bei einer niedrigeren Temperatur, während das Ventil 20, 21 ebenfalls entsprechend bei einer niedrigeren Temperatur geschlossen wird. Der Verbrennungsmotor arbeitet dann auf einem niedrigeren Temperaturniveau.In the position shown, the coolant flows through the inlet 17 located between the two valves 4, 16 and 20, 21 to and via the direct return 19, back to the internal combustion engine. When the coolant is at a higher temperature, the expansion material of the working element 3 expands, so that the working piston 2 extends from the housing of the working element 3 and is supported on an abutment 5. In the event of a further expansion and the associated extension of the working piston, the housing of the working element 3 with the valve plate 4 and the valve plate 20 is displaced. First, valve 4, 16 is opened and then valve 20, 21 is closed. The abutment 5 for the working piston 2 of the thermostatic working element 3, which is located in an extension 26 of the connecting piece 15, is adjustable such that the opening temperature of the thermostatic valve 32 can be changed by its adjustment. The abutment 5 is a body which can be displaced approximately transversely to the axis of the working piston 2 and which is guided in the extension 26 against the action of a compression spring 25. The abutment 5 is moved by an actuator 9 which is screwed into the shoulder 26 with a shoulder 27 and which can move the abutment 5 against the action of the spring 25 with a piston 23. The abutment 5 is provided with an inclined support surface 13 which extends at an inclination to the direction of movement of the working piston 2. The abutment 5 is displaceable such that the support points formed by it on the support surface 13 can assume any position between the value X of FIG. 1. In the position shown, the abutment 5 is set such that when the expansion material expands, the working piston 2 first has to travel an empty travel of size X before it bears against the inclined surface 13 of the abutment 5 and when the valve 4 is extended further, 16 opens and the valve 20, 21 closes. With this setting, the internal combustion engine is operated at an elevated temperature. With a corresponding shift of the abutment 5 into the other extreme position, the valve 4 opens, 16 earlier, ie at a lower temperature, while the valve 20, 21 is also closed accordingly at a lower temperature. The internal combustion engine then works at a lower temperature level.

Das Stellorgan 9, das beispielsweise ein elektrisches Stellorgan sein kann, wird von einem Signalgeber 28 betätigt, der die Führungsgröße darstellt. Dieser Signalgeber kann auf verschiedene Bedingungen ansprechen, beispielsweise auf die Außentemperatur oder die Abgastemperatur oder die Drehzahl oder das Drehmoment des Verbrennungsmotors oder den Unterdruck im Saugrohr oder die Druckdifferenz in einer Unterdruckdose oder die Öltemperatur. Auf diese Weise läßt sich durch Veränderung der Arbeitstemperatur des Verbrennungsmotors die Arbeit des Verbrennungsmotors optimieren.The actuator 9, which can be an electrical actuator, for example, is actuated by a signal generator 28, which represents the command variable. This signal transmitter can respond to various conditions, for example the outside temperature or the exhaust gas temperature or the speed or the torque of the internal combustion engine or the negative pressure in the intake manifold or the pressure difference in a vacuum box or the oil temperature. In this way, the work of the internal combustion engine can be optimized by changing the working temperature of the internal combustion engine.

Dem nicht dargestellten Kühler ist wenigstens ein Lüfter zugeordnet, der von einem Elektromotor angetrieben wird. Um den Leistungsbedarf zu senken, wird der Lüfter nur dann angetrieben, wenn er benötigt wird, d.h. wenn bestimmte Temperaturen im Kühlmittel und damit im Motor überschritten werden. Hierzu ist ein Temperaturfühler 34, beispielsweise im Motorbereich oder im Kühler, vorgesehen, der von dem Kühlmittel umströmt ist. Dieser Temperaturfühler 34 schaltet einen Stufenschalter 35, der beispielsweise bei einer festgestellten Temperatur von 95°C den Lüfter mit einer ersten Leistungsstufe 31 und bei einer Temperatur von 105°C den Lüfter mit einer zweiten Leistungsstufe 33 einschaltet. Dabei kann vorgesehen werden, daß entsprechend den Leistungsstufen 31 und 33 jeweils mehrere Lüfterantriebe für den Lüfter vorgesehen werden. Es ist auch möglich, entsprechend den Leistungsstufen 31 und 33 Widerstände in die Stromzuleitung zu dem Antriebsmotor zu legen. Darüber hinaus ist es auch möglich, einen Antriebsmotor für den Lüfter mit zwei Wicklungen vorzusehen, die dann entsprechend den Leistungsstufen 31 und 33 geschaltet werden. Gegebenenfalls ist es auch möglich, zwei Lüfter vorzusehen, von denen bei der Leistungsstufe 31, die der niedrigeren Kühlmitteltemperatur zugeordnet ist, nur einer und bei der Leistungsstufe 33 beide eingeschaltet werden. Darüber hinaus ist auch eine stufenlose Regelung des Lüfterantriebes möglich.The cooler, not shown, is assigned at least one fan which is driven by an electric motor. In order to reduce the power requirement, the fan is only driven when it is needed, i.e. if certain temperatures in the coolant and thus in the engine are exceeded. For this purpose, a temperature sensor 34 is provided, for example in the engine area or in the radiator, around which the coolant flows. This temperature sensor 34 switches a step switch 35 which, for example, switches on the fan with a first power level 31 at a determined temperature of 95 ° C. and the fan with a second power level 33 at a temperature of 105 ° C. It can be provided that several fan drives are provided for the fan in accordance with the power levels 31 and 33. It is also possible to place resistors in the power supply line to the drive motor in accordance with power levels 31 and 33. In addition, it is also possible to provide a drive motor for the fan with two windings, which are then switched according to the power levels 31 and 33. If necessary, it is also possible to provide two fans, of which only one is switched on at power level 31, which is assigned to the lower coolant temperature, and both of them at power level 33. In addition, stepless regulation of the fan drive is also possible.

Wenn der Verbrennungsmotor mit erhöhter Motortemperatur betrieben werden soll, so steuert der Signalgeber 28 entsprechend seiner Führungsgröße das Stellorgan 9 des Thermostatventils 32 derart an, daß für das Thermostatventil eine erhöhte Öffnungstemperatur eingestellt wird. Gleichzeitig mit dem Ansteuern des Stellorgans 9 wird ein Relais 29 geschaltet, das einen Öffner 30 betätigt, der in der Zuleitung zu der ersten Leistungsstufe 31 liegt. Die erste Leistungsstufe 31 kann dann nicht über den Temperaturfühler und den Stufenschalter 35 angesteuert werden. Dies bedeutet, daß bei der gewünschten, erhöhten Motortemperatur diese nicht durch Zuschalten des Lüfters mit der ersten Leistungsstufe 31 wieder reduziert wird, und daß außerdem bei dieser gewünschten Temperaturerhöhung weiter der Leistungverbrauch reduziert wird.If the internal combustion engine is to be operated with an increased engine temperature, the signal generator 28 controls the actuator 9 of the thermostatic valve 32 in accordance with its command variable in such a way that an increased opening temperature is set for the thermostatic valve. Simultaneously with the actuation of the actuator 9, a relay 29 is switched, which actuates an opener 30 which is in the supply line to the first power stage 31. The first power stage 31 can then not be controlled via the temperature sensor and the step switch 35. This means that at the desired, increased Motor temperature this is not reduced again by switching on the fan with the first power stage 31, and that, in addition, the power consumption is further reduced with this desired temperature increase.

Dieser Sperrung der ersten Leistungsstufe 31 des Lüfters bei Betrieb mit erhöhter Motortemperatur läßt sich entsprechend auch bei einem Lüfter einsetzen, bei dem eine stufenlose Drehzahlverstellung abhängig von der Kühlmitteltemperatur vorgesehen wird.This blocking of the first power stage 31 of the fan during operation with an increased engine temperature can accordingly also be used in a fan in which a stepless speed adjustment is provided depending on the coolant temperature.

Es muß dann die Schaltung so gewählt werden, daß der erste Bereich abgeschaltet wird, in welchem die Drehzahl des Lüfters noch einer niedrigeren Kühlmitteltemperatur zugeordnet ist. Prinzipiell das gleiche System ist auch anwendbar, wenn der Lüfter mit Hilfe einer Flüssigkeitskupplung mit einer Welle des Verbrennungsmotors verbunden ist. In diesem Fall muß dann die Füllmenge der Flüssigkeitsreibungskupplung entsprechend gesteuert werden.The circuit must then be selected so that the first area is switched off, in which the speed of the fan is assigned to a lower coolant temperature. In principle, the same system can also be used if the fan is connected to a shaft of the internal combustion engine by means of a fluid coupling. In this case, the filling quantity of the fluid friction clutch must then be controlled accordingly.

Claims (3)

1. Device for cooling an internal combustion engine of a motor vehicle, comprising a thermostatic valve which controls the coolant flow from and to the internal combustion engine via a direct return line or via a radiator and comprising at least one cooling fan which is associated with the radiator and which can be operated at at least two power output stages depending on at least one lower and one higher coolant temperature which is detected by a temperature sensor (34) associeted with a separate fan actuating circuit, characterised in that the thermostatic valve (32) can be set for at least two different opening temperatures, and that with the adjustment of the thermostatic valve (32) to a higher opening temperature, the switching of the fan to the power output stage associated with the lower coolant temperature is blocked.
2. Device according to Claim 1, characterised in that in the electric control circuit for an electric actuator (9) for adjusting the thermostatic valve (32), there is provided a relay (29) which is controlled by the same signal transmitter (28) and which actuates a break contact in the electric feed line to that power stage (31) of the electrically driven fan which is associated with the lower coolant temperature.
3. Device according to Claim 1 or 2, characterised in that the thermostatic valve (32) contains a thermostatic working element (3) having a housing which supports a valve disc (4) of a valve (4, 16) leading to the fan, and having a working piston (2) which extends upon heating and which lies opposite an abutment (5), the position of which can be varied in such a manner that the distance between the support point for the working piston (2) and the housing (3) can be set with the aid of the valve disc (4).
EP84105274A 1983-06-04 1984-05-10 Cooling device for an internal-combustion engine Expired - Lifetime EP0128365B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3320338A DE3320338A1 (en) 1983-06-04 1983-06-04 DEVICE FOR COOLING AN INTERNAL COMBUSTION ENGINE
DE3320338 1983-06-04

Publications (4)

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EP0128365A2 EP0128365A2 (en) 1984-12-19
EP0128365A3 EP0128365A3 (en) 1985-07-31
EP0128365B1 EP0128365B1 (en) 1987-07-01
EP0128365B2 true EP0128365B2 (en) 1991-02-13

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EP84105274A Expired - Lifetime EP0128365B2 (en) 1983-06-04 1984-05-10 Cooling device for an internal-combustion engine

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US (1) US4537158A (en)
EP (1) EP0128365B2 (en)
JP (1) JPS603425A (en)
DE (2) DE3320338A1 (en)

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Also Published As

Publication number Publication date
JPH0567768B2 (en) 1993-09-27
EP0128365B1 (en) 1987-07-01
DE3464516D1 (en) 1987-08-06
US4537158A (en) 1985-08-27
DE3320338A1 (en) 1984-12-06
EP0128365A3 (en) 1985-07-31
EP0128365A2 (en) 1984-12-19
JPS603425A (en) 1985-01-09

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