EP0931208B1 - Method and control of regulation of vehicle cooling circuit by means of a thermally regulated water pump - Google Patents

Method and control of regulation of vehicle cooling circuit by means of a thermally regulated water pump Download PDF

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Publication number
EP0931208B1
EP0931208B1 EP97909371A EP97909371A EP0931208B1 EP 0931208 B1 EP0931208 B1 EP 0931208B1 EP 97909371 A EP97909371 A EP 97909371A EP 97909371 A EP97909371 A EP 97909371A EP 0931208 B1 EP0931208 B1 EP 0931208B1
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EP
European Patent Office
Prior art keywords
retarder
coolant
speed
engine
coolant pump
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.)
Expired - Lifetime
Application number
EP97909371A
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German (de)
French (fr)
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EP0931208A1 (en
Inventor
Peter Edelmann
Klaus Vogelsang
Peter Rose
Peter Heilinger
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Voith Turbo GmbH and Co KG
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Voith Turbo GmbH and Co KG
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Publication of EP0931208A1 publication Critical patent/EP0931208A1/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
    • F01P7/164—Controlling of coolant flow the coolant being liquid by thermostatic control by varying pump 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
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/10—Pumping liquid coolant; Arrangements of coolant pumps
    • F01P2005/105—Using two or more pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/60—Operating parameters
    • 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
    • F01P2025/66—Vehicle 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
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/06—Retarder
    • 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
    • F01P7/161—Controlling of coolant flow the coolant being liquid by thermostatic control by bypassing 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

Definitions

  • the invention relates to a method for adjusting the engine temperature by means of a cooling circuit and a device for adjusting the Engine temperature.
  • cooling circuits comprising a coolant, preferably water with the appropriate anti-freeze additives. It flows through a certain amount of coolant per unit of time the engine to be cooled, absorbs the heat of the internal combustion engine and transports them to a cooler, for example a finned cooler, in the amount of heat absorbed and transported to the environment is delivered.
  • the cooling capacity of such a system is in the essentially determined by the amount of coolant circulated.
  • the coolant is circulated by means of a coolant pump. there the flow rate of the coolant pump determines the coolant flow through the Cooling circuit.
  • Coolant pump generally depends on its speed.
  • Conventional coolant pumps are in constant drive connection the engine, so they work depending on the engine speed.
  • this method for cooling an engine, especially one Internal combustion engine is that high pumping power even in cases in to whom this is not required. For example summer and winter will always be the same with such an arrangement Amount of coolant pumped through the cooling circuit. This is what happens an unnecessary power consumption on the part of the engine, which in certain operating situations to unnecessarily high fuel consumption leads.
  • This problem becomes particularly serious when in the cooling circuit a retarder is inserted, its working medium at the same time Coolant for the engine is. Then the must for safe heat dissipation Flow rate of the coolant pump should be designed so that even connected retarder the heat can be dissipated. This requires Pumps with very high performance.
  • a separate fluid circuit e.g. according to DE-A-44 47 166, Fig. 13
  • the retarder is in the To integrate the water circuit of the engine cooler (DE-A-44 47 166, Fig. 10-12, column 4).
  • JP-A-63097 823 are the temperature setpoints in the cooling circuit to be determined depending on the load.
  • this object is achieved by a method according to the Claim 1 and a device according to claim 16 solved.
  • the coolant temperature in the Cooling circuit by means of a speed-controlled coolant pump is set that an optimal engine temperature value as quickly as possible reached and a maximum value is never exceeded.
  • the Engine temperature is continuously determined, for example in sampling intervals, the can range from several seconds to milliseconds.
  • the predetermined maximum temperature value for the motor in further training depending on the current Engine power specified.
  • the cooling circuit always close to the temperature limit of the engine drive, which is particularly fuel-efficient because the performance of the Coolant pump is then optimally adjusted.
  • Cooling circuits include a retarder, wherein the coolant the Working medium of the retarder itself.
  • the retarder in Cooling circuit can be switched on and off, for example by means of a Changeover valve that bypasses the coolant past the retarder leads when this is not working.
  • a particularly fuel-efficient embodiment provides that in addition to the speed-controlled coolant pump at least one more Coolant pump is provided. This can either depending on engine speed, driving speed or operated depending on the retarder speed.
  • the speed-controlled coolant pump can be designed so that the Provides basic cooling load in the cooling circuit and only for special ones Loads that the additional coolant pump is switched on, for example at Ascent.
  • Cooling circuits which include a retarder, as particularly advantageous.
  • the speed-controlled coolant pump in its Performance is designed so that it is for everyone Operating situation of the engine with or not in operation the retarder is switched off sufficient cooling of the motor geußraut.
  • the at least one further coolant pump when the retarder is operated is switched on, so that the additional heat generated in the retarder can be safely removed, d. H. with the help of this further coolant pump in combination with the speed-controlled coolant pump sufficient cooling of the motor is guaranteed.
  • the further coolant pump depending on the engine speed, operated depending on retarder speed or depending on vehicle speed is measured in its performance so that it for a sufficient cooling of the engine required basic power in all Provides operating states.
  • the coolant pump is then only operated when the retarder is switched on exactly in such a way that the maximum of the previously mentioned maximum on the motor Engine temperature is not exceeded.
  • a coolant Water with the appropriate antifreeze.
  • the retarder can be a primary retarder, i.e. a retarder whose Speed is dependent on the engine speed, or else a secondary retarder, whose speed is dependent on the driving speed. It goes without saying it is possible that the coolant at the same time as working medium of the retarder serves.
  • the invention is also intended to include the case that the coolant of the Motors is not the working tool of the retarder, but only for example, is passed through a heat exchanger and from there the Heat, which is generated in the retarder during braking, absorbs.
  • the invention provides a device for adjusting the Motor temperature available.
  • the cooling circuit of the device according to the invention comprises in one Development of the invention in addition to the retarder, a changeover valve.
  • FIG. 1 is a drive unit consisting of a motor 1 and a Cooling circuit 3 shown.
  • the cooling circuit 3 comprises a cooler 5, one Coolant pump 7, which is designed as a speed-controlled coolant pump, and a surge tank 9, the pump suction side always for one sufficient overpressure. Furthermore, one is in the cooling circuit Switchover valve 11 and a retarder 13 are provided.
  • the invention but is in no way limited to only those embodiments in which a retarder is arranged in the coolant circuit. The invention is also applicable when only engine cooling by means of a cooling circuit and a speed-controlled coolant pump is provided.
  • a bypass line 40 leads past the cooler and branches at point 42.
  • a changeover valve 44 is arranged, which is a 3/2-way valve can be designed.
  • the 3/2-way valve has the function of Control coolant flow so that it either through the radiator or can be led past the cooler through the bypass line 40.
  • the 3/2-way valve controls the operating phase with high heat dissipation Some or most of the cooling flow to the cooler 5.
  • Lower in phase The 3/2-way changeover valve 44 controls heat dissipation via the coolant the bypass line to motor 1 or to pump 7.
  • the 3/2-way valve can be designed as an expansion valve or as an electrical or pneumatic continuously regulating valve.
  • the cooler can be supported by means of a fan 15.
  • the engine 1 has in the present case as a means for determining the temperature Temperature sensor 20 on.
  • a control device 24 supplied, which represents the current engine temperature.
  • the control device 24 a variety of temperature signals and to determine the actual temperature value, which as Reference variable in the present control loop, an averaging over a Large number of temperature signals.
  • the control device 24 itself is a maximum temperature value for the motor as a setpoint for the Control loop filed.
  • this maximum temperature set point is a single value for all operating states of the engine.
  • a Value that follows the load state of the motor following the pump speed control act directly i.e. the pump control is not just that Temperature setpoint dependent.
  • the detection of the load status can Torque sensor or the control unit of the engine. It different control algorithms are now conceivable. So it can speed-controlled coolant pump 7 with a certain constant Speed are operated and the control only intervenes when the Motor temperature exceeds the specified maximum temperature value. It is then adjusted, i. H. the delivery rate increases.
  • the amount of coolant caused by the engine is always promoted so that the engine at the maximum permissible coolant temperature is driven, d. H. the coolant pump will in their speed both with deviations to higher as well as lower temperatures than the specified target temperature using the Regulating device 24 regulated. This ensures that in the cooling circuit only circulates the exact amount that is required for Reaching the engine setpoint temperature is required. This is it Particularly advantageous if the coolant pump 7 is speed-controlled means its delivery rate directly from the speed at which it rotates depends.
  • FIG. 2 shows a further embodiment of the invention, wherein in the cooling circuit in addition to the speed-controlled pump 7 another Pump 30 is provided.
  • the pump 30 is in this embodiment the switching valve 11 for the bypass 26 is arranged.
  • the same reference numerals are again chosen in FIG. 2.
  • the advantage of the training shown in FIG. 2 is that the speed-controlled pump 7 depending on the control device 24 the motor temperature recorded via the sensor 20 is regulated in their delivery rate can be designed very low, because in the cooling circuit a further pump 30 is provided, which in the present Embodiment is operated depending on the vehicle speed and for provides a basic delivery rate in the cooling circuit.
  • the pump 30 is like this dimensioned so that when the retarder is not operated, i. H. in that condition, in which the coolant passes the retarder through the bypass line 26 is sufficient to provide the pump power required for engine cooling to provide.
  • the control will respond and the control device Start speed-controlled pump 7, which then exactly with one is operated such a speed that an additional flow rate for Is provided to undue heating of the engine prevent.
  • the control device in turn operates as in FIG. 1 described, d. H. in the event of deviations from a specified one Motor temperature setpoint is the speed of pump 7 as long set accordingly until this specified setpoint motor temperature is reached.
  • the regulation allows the coolant circuit Always drive straight so that the engine is close to the maximum permissible temperature. As already shown above, this has one considerable fuel savings.
  • a third embodiment shown in Fig. 3 are again for same aggregates the same reference numerals as in Figs. 1 and 2 used.
  • the further pump 30 is now behind the changeover valve 11 arranged immediately before the retarder 13.
  • the base load for The speed-controlled pump 7 now takes over coolant delivery again depending on the engine temperature using the Control device 24 controlled and in such a way that depending on predetermined target value and the deviation of the actual value from it speed-controlled pump is controlled.
  • the speed-controlled pump can be interpreted in their delivery rate very low, since they only the in Coolant circuit without any heat generated by the retarder must be removed. If the retarder is now switched on, the another pump 30 switched on and the higher required for cooling Delivery volume made available by this.
  • Both according to the embodiment according to FIG. 2 and according to FIG. 3 can the control device additionally via a signal line 32 with the Switching valve 11 may be connected in order to be supplied with a status signal to get information about whether the coolant through the Retarder or bypassed by this.
  • the To activate control by means of the control device 24 only when on a signal is present on the signal line 32, which indicates the coolant is passed through the retarder and serves as the working medium there.
  • the speed-controlled pumps 7 can be driven by means of a Electric motor, which in turn is connected to the electrical circuit of the vehicle connected.
  • Electric motors that are suitable are known to the person skilled in the art the prior art, see, for example, "Dubbel, Paperback for mechanical engineering, 18th edition, 1995, pages V18 - V51 known.
  • coolant pumps be one or more of which are speed-controlled coolant pumps.

Abstract

The invention relates to a method of adjusting engine temperature by means of a cooling circuit comprising a coolant and a coolant pump. The invention is characterized by the fact that the temperature of the coolant is adjusted by means of at least one speed regulated coolant pump (7) dependent on engine temperature so that a predetermined maximum engine temperature value is not exceeded.

Description

Die Erfindung betrifft ein Verfahren zur Einstellung der Motortemperatur mittels eines Kühlkreislaufes sowie eine Vorrichtung zur Einstellung der Motortemperatur.The invention relates to a method for adjusting the engine temperature by means of a cooling circuit and a device for adjusting the Engine temperature.

Zur Kühlung von Motoren, insbesondere Verbrennungsmotoren, werden heute in der Regel Kühlkreisläufe umfassend ein Kühlmittel, vorzugsweise Wasser mit den entsprechenden Frostschutzzusätzen, eingesetzt. Dabei durchströmt eine bestimmte Kühlmittelmenge pro Zeiteinheit den zu kühlenden Motor, nimmt dabei die abzuführende Wärme des Verbrennungsmotores auf und transportiert diese zu einem Kühler, beispielsweise einen Rippenkühler, in dem die aufgenommene und transportierte Wärmemenge an die Umgebung abgegeben wird. Die Kühlleistung eines solchen Systems wird im wesentlichen durch die umgewälzte Menge Kühlmittel bestimmt. Die Umwälzung des Kühlmittels erfolgt mittels einer Kühimittelpumpe. Dabei bestimmt die Fördermenge der Kühlmittelpumpe den Kühlmittelfluß durch den Kühlkreislauf.For cooling engines, especially combustion engines, are used today usually cooling circuits comprising a coolant, preferably water with the appropriate anti-freeze additives. It flows through a certain amount of coolant per unit of time the engine to be cooled, absorbs the heat of the internal combustion engine and transports them to a cooler, for example a finned cooler, in the amount of heat absorbed and transported to the environment is delivered. The cooling capacity of such a system is in the essentially determined by the amount of coolant circulated. The The coolant is circulated by means of a coolant pump. there the flow rate of the coolant pump determines the coolant flow through the Cooling circuit.

Wie aus dem Stand der Technik hinlänglich bekannt, ist die Fördermenge der Kühlmittelpumpe im allgemeinen von deren Drehzahl abhängig. Herkömmliche Kühlmittelpumpen stehen in ständiger Triebverbindung mit dem Motor, sie arbeiten somit also motordrehzahlabhängig. Nachteilig an diesem Verfahren zur Kühlung eines Motors, insbesondere eines Verbrennungsmotors ist, daß eine hohe Pumpleistung auch in Fällen, in denen diese nicht benötigt wird, zur Verfügung gestellt wird. Beispielsweise wird Sommers wie Winters bei einer derartigen Anordnung immer dieselbe Menge Kühlmittel durch den Kühlkreislauf gefördert. Hierdurch kommt es zu einer unnötigen Leistungsaufnahme von seiten des Motors, was in bestimmten Betriebssituationen zu einem unnötig hohen Kraftstoffverbrauch führt. Besonders gravierend wird dieses Problem, wenn in den Kühlkreislauf eine Retarder eingebracht wird, dessen Arbeitsmedium gleichzeitig Kühlmedium für den Motor ist. Dann muß zur sicheren Wärmeabfuhr die Fördermenge der Kühlmittelpumpe so ausgelegt sein, daß auch noch bei zugeschaltetem Retarder die Wärme abgeführt werden kann. Dies erfordert Pumpen mit sehr hoher Leistung.As is well known from the prior art, the delivery rate is Coolant pump generally depends on its speed. Conventional coolant pumps are in constant drive connection the engine, so they work depending on the engine speed. Disadvantageous this method for cooling an engine, especially one Internal combustion engine is that high pumping power even in cases in to whom this is not required. For example summer and winter will always be the same with such an arrangement Amount of coolant pumped through the cooling circuit. This is what happens an unnecessary power consumption on the part of the engine, which in certain operating situations to unnecessarily high fuel consumption leads. This problem becomes particularly serious when in the cooling circuit a retarder is inserted, its working medium at the same time Coolant for the engine is. Then the must for safe heat dissipation Flow rate of the coolant pump should be designed so that even connected retarder the heat can be dissipated. This requires Pumps with very high performance.

Der Stand der Technik nach der ATZ-Beilage: Der "intelligente Kühlkreislauf" ein neues Konzept für die Motorkühlung; ATZ 95(1993) September, No.9, Stuttgart (DE) beschreibt einen mikroprozessorgesteuerten Motorkühlkreislauf mit mehreren drehzahlgeregelten Kühlmittelpumpen 8,4,12 (Bild. 3, S. V/VI). Ein Retarder ist auch vorgesehen ist (6, S.VI, Sp. 1), sein Kühler beaufschlagt den Motorkühlkreislauf in dem die drehzahlgeregelten Kühlmittelpumpen 8,4,12 vorgesehen sind.
In diesem Motorkühlkreislauf wird aufgrund der Regelung anhand von permanent erfaßten kritischen Bauteiltemperaturen (S.VI; Sp.2) eine vorbestimmte Motortemperatur unabhängig vom zu- und abschaltbaren Retarderbetrieb nicht überschritten.The state of the art according to the ATZ supplement: the "intelligent cooling circuit" a new concept for engine cooling; ATZ 95 (1993) September, No.9, Stuttgart (DE) describes a microprocessor-controlled engine cooling circuit with several speed-controlled coolant pumps 8, 4, 12 (Fig. 3, S. V / VI). A retarder is also provided (6, S.VI, column 1), its cooler acts on the engine cooling circuit in which the speed-controlled coolant pumps 8, 4, 12 are provided.
In this engine cooling circuit, a predetermined engine temperature is not exceeded, regardless of the retarder operation that can be switched on and off, due to the control based on permanently recorded critical component temperatures (S.VI; Sp.2).

Gemäß DE-A-44 47 166 ist für einen Retarder einen separaten Fluidkreislauf (z.B. gemäß DE-A-44 47 166, Fig 13.) vorzusehen oder der Retarder ist in den Wasserkreislauf des Motorkühlers zu integrieren (DE-A- 44 47 166, Fig. 10-12, Sp. 4).According to DE-A-44 47 166, a separate fluid circuit (e.g. according to DE-A-44 47 166, Fig. 13) or the retarder is in the To integrate the water circuit of the engine cooler (DE-A-44 47 166, Fig. 10-12, column 4).

Nach der JP-A- 63097 823 sind die Temperatur - Sollwerte im Kühlkreislauf lastabhängig festzusetzen.According to JP-A-63097 823 are the temperature setpoints in the cooling circuit to be determined depending on the load.

Es ist somit Aufgabe der Erfindung, ein Verfahren zur Kühlung von Motoren, insbesondere Verbrennungsmotoren, anzugeben, mit dem die oben geschilderten Nachteile des Standes der Technik überwunden werden können, sowie eine Regelvorrichtung hierfür.It is therefore an object of the invention to provide a method for cooling motors, in particular internal combustion engines, with which the above described disadvantages of the prior art are overcome can, as well as a control device for this.

Erfindungsgemäß wird diese Aufgabe durch ein Verfahren gemäß dem Anspruch 1 und eine Vorrichtung gemäß dem Anspruch 16 gelöst.According to the invention, this object is achieved by a method according to the Claim 1 and a device according to claim 16 solved.

Gemäß einem Teil des erfindungsgemäßen Verfahrens zur Einstellung der Motortemperatur ist vorgesehen, daß die Kühlmitteltemperatur in dem Kühlkreislauf mittels einer drehzahlgeregelten Kühlmittelpumpe derart eingestellt wird, daß möglichst schnell ein optimaler Motortemperaturwert erreicht und ein maximaler Wert keinesfalls überschritten wird.According to part of the method according to the invention for adjusting the Engine temperature is provided so that the coolant temperature in the Cooling circuit by means of a speed-controlled coolant pump is set that an optimal engine temperature value as quickly as possible reached and a maximum value is never exceeded.

In einer Weiterbildung der Erfindung kann vorgesehen sein, daß die Motortemperatur ständig ermittelt wird, beispielsweise in Abtastintervallen, die in einem Bereich von mehreren Sekunden bis zu Millisekunden liegen kann.In a development of the invention it can be provided that the Engine temperature is continuously determined, for example in sampling intervals, the can range from several seconds to milliseconds.

Erfindungsgemäß ist der vorgegebenen Temperaturmaximalwertes für den Motor in einer Weiterbildung in Abhängigkeit von der aktuellen Motorleistung vorgegeben. Auf diese Art und Weise ist es möglich, mit dem Kühlkreislauf immer nahe an der Temperaturgrenze des Motors zu fahren, was besonders kraftstoffsparend ist, da die Leistung der Kühlmittelpumpe dann optimal angepaßt wird.According to the invention, the predetermined maximum temperature value for the motor in further training depending on the current Engine power specified. In this way it is possible with the cooling circuit always close to the temperature limit of the engine drive, which is particularly fuel-efficient because the performance of the Coolant pump is then optimally adjusted.

Besonders vorteilhaft ist es, daß erfindungsgemäß die Kühlkreisläufe einen Retarder umfassen, wobei das Kühlmittel das Arbeitsmedium des Retarders selbst ist.It is particularly advantageous that the invention Cooling circuits include a retarder, wherein the coolant the Working medium of the retarder itself.

In einer Weiterbildung der Erfindung ist vorgesehen, daß der Retarder im Kühlkreislauf zu- und abgeschaltet werden kann, beispielsweise mittels eines Umschaltventiles, der das Kühlmittel in einem Bypass am Retarder vorbei leitet, wenn dieser nicht arbeitet.In a development of the invention it is provided that the retarder in Cooling circuit can be switched on and off, for example by means of a Changeover valve that bypasses the coolant past the retarder leads when this is not working.

Eine besonders kraftstoffeffiziente Ausführungsform sieht vor, daß neben der drehzahlgeregelten Kühlmittelpumpe mindestens eine weitere Kühlmittelpumpe vorgesehen ist. Diese kann entweder motordrehzahlabhängig, fahrgeschwindigkeitsabhängig oder retarderdrehzahlabhängig betrieben werden.A particularly fuel-efficient embodiment provides that in addition to the speed-controlled coolant pump at least one more Coolant pump is provided. This can either depending on engine speed, driving speed or operated depending on the retarder speed.

Bei einem Kühlmittelkreislauf, der mehrere Kühlmittelpumpen umfaßt, kann die drehzahlgeregelte Kühlmittelpumpe so ausgelegt werden, daß sie die Grundkühllast im Kühlkreislauf zur Verfügung stellt und nur bei besonderen Belastungen die weitere Kühimittelpumpe zugeschaltet wird, zum Beispiel bei Bergfahrt. Insbesondere erweist sich eine derartige Anordnung bei Kühlkreisläufen, die einen Retarder umfassen, als besonders vorteilhaft. Hier kann vorgesehen sein, daß die drehzahlgeregelte Kühlmittelpumpe in ihrem Leistungsvermögen gerade so ausgelegt wird, daß sie für jede Betriebssituation des Motors bei nicht in Betrieb befindlichen oder abgeschaltetem Retarder eine ausreichende Kühlung des Motors gewähleistet.In the case of a coolant circuit which comprises a plurality of coolant pumps, the speed-controlled coolant pump can be designed so that the Provides basic cooling load in the cooling circuit and only for special ones Loads that the additional coolant pump is switched on, for example at Ascent. Such an arrangement proves in particular Cooling circuits, which include a retarder, as particularly advantageous. Here can be provided that the speed-controlled coolant pump in its Performance is designed so that it is for everyone Operating situation of the engine with or not in operation the retarder is switched off sufficient cooling of the motor gewähleistet.

In einer Weiterbildung dieses Gedankens kann dann vorgesehen sein, daß die mindestens eine weitere Kühlmittelpumpe, wenn der Retarder betrieben wird, zugeschaltet wird, so daß die im Retarder zusätzlich erzeugte Wärme noch sicher abgeführt werden kann, d. h. mit Hilfe dieser weiteren Kühlmittelpumpe in Kombination mit der drehzahlgeregelten Kühlmittelpumpe eine ausreichende Kühlung des Motors gewährleistet wird.In a further development of this idea it can then be provided that the at least one further coolant pump when the retarder is operated, is switched on, so that the additional heat generated in the retarder can be safely removed, d. H. with the help of this further coolant pump in combination with the speed-controlled coolant pump sufficient cooling of the motor is guaranteed.

Selbstverständlich ist es in einer alternativen Ausgestaltung der Erfindung auch möglich, daß die weitere Kühimittelpumpe, die motordrehzahlabhängig, retarderdrehzahlabhängig oder aber fahrgeschwindigkeitsabhängig betrieben wird, in ihrem Leistungsvermögen so bemessen wird, daß sie die für eine ausreichende Kühlung des Motors benötigte Grundleistung in allen Betriebszuständen zur Verfügung stellt. Die drehzahlgeregelte Kühlmittelpumpe wird dann nur bei zugeschaltetem Retarder betrieben und zwar genau derart, daß am Motor die zuvor bereits erwähnte maximale Motortemperatur nicht überschritten wird. Als Kühlmittel gelangt in der Regel Wasser mit den entsprechenden Frostschutzmitteln zum Einsatz.Of course it is in an alternative embodiment of the invention it is also possible that the further coolant pump, depending on the engine speed, operated depending on retarder speed or depending on vehicle speed is measured in its performance so that it for a sufficient cooling of the engine required basic power in all Provides operating states. The speed controlled The coolant pump is then only operated when the retarder is switched on exactly in such a way that the maximum of the previously mentioned maximum on the motor Engine temperature is not exceeded. Usually comes as a coolant Water with the appropriate antifreeze.

Der Retarder kann sowohl ein Primärretarder, also ein Retarder, dessen Drehzahl motordrehzahlabhängig ist, oder aber auch ein Sekundärretarder, dessen Drehzahl fahrgeschwindigkeitsabhängig ist, sein. Selbstverständlich ist es möglich, daß das Kühlmittel gleichzeitig als Arbeitsmittel des Retarders dient. Die Erfindung soll aber auch den Fall umfassen, daß das Kühlmittel des Motors nicht zugleich Arbeitsmittel des Retarders ist, sondern lediglich beispielsweise durch einen Wärmetauscher geleitet wird und von dort die Wärme, die im Bremsbetrieb im Retarder erzeugt wird, aufnimmt. The retarder can be a primary retarder, i.e. a retarder whose Speed is dependent on the engine speed, or else a secondary retarder, whose speed is dependent on the driving speed. It goes without saying it is possible that the coolant at the same time as working medium of the retarder serves. The invention is also intended to include the case that the coolant of the Motors is not the working tool of the retarder, but only for example, is passed through a heat exchanger and from there the Heat, which is generated in the retarder during braking, absorbs.

Neben dem Verfahren stellt die Erfindung eine Vorrichtung zur Einstellung der Motortemperatur zur Verfügung.In addition to the method, the invention provides a device for adjusting the Motor temperature available.

Der Kühlkreislauf der erfindungsgemäßen Vorrichtung umfaßt in einer Weiterbildung der Erfindung neben dem Retarder ein Umschaltventil.The cooling circuit of the device according to the invention comprises in one Development of the invention in addition to the retarder, a changeover valve.

Besonders vorteilhaft ist es, wenn bei einer derartigen Vorrichtung mit einem Retarder und einem Umschaltventil die Vorrichtung des weiteren eine Umschaltventilansteuerung aufweist.It is particularly advantageous if, in the case of such a device, with a Retarder and a switching valve the device further one Has switching valve control.

Besonders bevorzugt ist es, wenn weitere Pumpen im Kühlmittelkreislauf vorgesehen sind, diese mit einer seperaten Ansteuerung, beispielsweise zum Inbetriebnehmen und Außerbetriebnehmen, zu versehen.It is particularly preferred if further pumps in the coolant circuit are provided, these with a separate control, for example Commissioning and decommissioning.

Die Erfindung soll nunmehr anhand der Zeichnungen beispielhaft beschrieben werden.The invention will now be described by way of example with reference to the drawings become.

Es zeigen:

  • Fig. 1 eine Antriebseinheit mit der erfindungsgemäßen Regelvorrichtung.
  • Fig. 2 eine Antriebseinheit mit der erfindungsgemäßen Regelvorrichtung und einer weiteren Kühlmittelpumpe.
  • Fig. 3 eine alternative Ausführungsform der Erfindung gemäß Fig. 2.
    • Show it:
  • Fig. 1 shows a drive unit with the control device according to the invention.
  • Fig. 2 shows a drive unit with the control device according to the invention and a further coolant pump.
  • 3 shows an alternative embodiment of the invention according to FIG. 2.

    • In Figur 1 ist eine Antriebseinheit bestehend aus einem Motor 1 sowie einem Kühlkreislauf 3 dargestellt. Der Kühlkreislauf 3 umfaßt einen Kühler 5, eine Kühlmittelpumpe 7, die als drehzahlgeregelte Kühlmittelpumpe ausgelegt ist, sowie einen Ausgleichsbehälter 9, der pumpensaugseitig immer für einen ausreichenden Überdruck sorgt. Des weiteren ist in dem Kühlkreislauf ein Umschaltventil 11 sowie ein Retarder 13 vorgesehen. Die Erfindung beschränkt sich aber keinesfalls nur auf solche Ausführungsformen, bei denen im Kühlmittelkreislauf ein Retarder angeordnet ist. Die Erfindung ist auch anwendbar, wenn nur eine Motorkühlung mittels eines Kühlkreislaufes und einer drehzahlgeregelten Kühlmittelpumpe vorgesehen ist.In Figure 1 is a drive unit consisting of a motor 1 and a Cooling circuit 3 shown. The cooling circuit 3 comprises a cooler 5, one Coolant pump 7, which is designed as a speed-controlled coolant pump, and a surge tank 9, the pump suction side always for one sufficient overpressure. Furthermore, one is in the cooling circuit Switchover valve 11 and a retarder 13 are provided. The invention but is in no way limited to only those embodiments in which a retarder is arranged in the coolant circuit. The invention is also applicable when only engine cooling by means of a cooling circuit and a speed-controlled coolant pump is provided.

    Am Kühler führt eine Bypassleitung 40 vorbei, die sich im Punkt 42 verzweigt. Im Punkt 42 ist ein Umschaltventil 44 angeordnet, das als 3/2-Wege Ventil ausgelegt sein kann. Das 3/2-Wege-Ventil hat die Funktion den Kühlmittelstrom so zu steuern ,daß er entweder durch den Kühler oder aber durch die Bypassleitung 40 am Kühler vorbei geführt werden kann. In einer Betriebsphase mit hoher Wärmeabfuhr steuert das 3/2-Wege-Ventil den Kühlstrom teilweise oder größtenteils zum Kühler 5. In der Phase geringer Wärmeabführung steuert das 3/2-Wege-Umschaltventil 44 das Kühlmittel über die Bypassleitung zum Motor 1 bzw zur Pumpe 7. Das 3/2-Wege-Ventil kann als Dehnstoffregelventil ausgeführt sein oder als elektrisches oder pneumatische stetig regelndes Ventil.A bypass line 40 leads past the cooler and branches at point 42. At point 42, a changeover valve 44 is arranged, which is a 3/2-way valve can be designed. The 3/2-way valve has the function of Control coolant flow so that it either through the radiator or can be led past the cooler through the bypass line 40. In a The 3/2-way valve controls the operating phase with high heat dissipation Some or most of the cooling flow to the cooler 5. Lower in phase The 3/2-way changeover valve 44 controls heat dissipation via the coolant the bypass line to motor 1 or to pump 7. The 3/2-way valve can be designed as an expansion valve or as an electrical or pneumatic continuously regulating valve.

    Der Kühler kann mittels eines Lüfters 15 unterstützt werden. Der Motor 1 weist in vorliegendem Fall als Mittel zur Bestimmung der Temperatur einen Temperatursensor 20 auf. Selbstverständlich können auch mehrere Temperatursensoren an verschiedenen Stellen des Motors oder auch in der Kühlmittelleitung, die vom Motor wegführt, positioniert werden. Über die Signalleitung 22 wird einer Regelvorrichtung 24 ein Temperatursignal zugeführt, das die jeweils aktuelle Motortemperatur repräsentiert. Selbstverständlich ist es beispielsweise bei mehreren Temperatursensoren möglich, der Regelvorrichtung 24 eine Vielzahl von Temperatursignalen zuzuleiten und zur Bestimmung des Temperatur-Istwertes, der als Führungsgröße in vorliegendem Regelkreis dient, eine Mittelung über eine Vielzahl von Temperatursignalen vorzunehmen. In der Regelvorrichtung 24 selbst ist ein für den Motor maximaler Temperaturwert als Sollwert für den Regelkreis abgelegt. Es ist möglich, daß dieser maximale Temperatur-Sollwert ein einziger Wert für alle Betriebszustände des Motors ist. Ebenso kann ein Wert, der dem Lastzustand des Motors folgt auf die Pumpendrehzahlregelung direkt einwirken, d.h. die Pumpenregelung ist nicht nur alleine von dem Temperatursollwert abhängig. Die Erkennung des Lastzustandes kann einen Drehmomentsensor oder der Regeleinheit des Motors entnommen werden. Es sind nun verschiedene Regelalgorithmen denkbar. So kann die drehzahlgeregelte Kühlmittelpumpe 7 mit einer bestimmten konstanten Drehzahl betrieben werden und die Regelung greift nur dann ein, wenn die Motortemperatur den vorgegebenen maximalen Temperaturwert überschreitet. Es wird dann nachgeregelt, d. h. die Fördermenge erhöht.The cooler can be supported by means of a fan 15. The engine 1 has in the present case as a means for determining the temperature Temperature sensor 20 on. Of course, several can Temperature sensors at various points in the engine or in the Coolant line that leads away from the engine. About the Signal line 22 becomes a temperature signal to a control device 24 supplied, which represents the current engine temperature. It goes without saying, for example, in the case of several temperature sensors possible, the control device 24 a variety of temperature signals and to determine the actual temperature value, which as Reference variable in the present control loop, an averaging over a Large number of temperature signals. In the control device 24 itself is a maximum temperature value for the motor as a setpoint for the Control loop filed. It is possible that this maximum temperature set point is a single value for all operating states of the engine. Likewise, a Value that follows the load state of the motor following the pump speed control act directly, i.e. the pump control is not just that Temperature setpoint dependent. The detection of the load status can Torque sensor or the control unit of the engine. It different control algorithms are now conceivable. So it can speed-controlled coolant pump 7 with a certain constant Speed are operated and the control only intervenes when the Motor temperature exceeds the specified maximum temperature value. It is then adjusted, i. H. the delivery rate increases.

    In einer Fortbildung der Erfindung kann vorgesehen sein, mittels der drehzahlgeregelten Pumpe die Kühlmittelmenge, die durch den Motor gefördert wird, immer gerade so zu bemessen, daß der Motor an der maximal zulässigen Kühlmitteltemperatur gefahren wird, d. h. die Kühlmittelpumpe wird in ihrer Drehzahl sowohl bei Abweichungen zu höheren wie auch zu niedrigeren Temperaturen, als der vorgegebenen Solltemperatur mittels der Regelvorrichtung 24 geregelt. Auf diese Art und Weise wird sichergestellt, daß im Kühlkreislauf immer nur genau die Fördermenge umläuft, die zur Erreichung der Motorsollwert-Temperatur erforderlich ist. Hierzu ist es besonders vorteilhaft, wenn die Kühlmittelpumpe 7 drehzahlgeregelt ist, das bedeutet, ihre Fördermenge von der Drehzahl mit der sie umläuft, direkt abhängt.In a further development of the invention can be provided by means of speed controlled pump the amount of coolant caused by the engine is always promoted so that the engine at the maximum permissible coolant temperature is driven, d. H. the coolant pump will in their speed both with deviations to higher as well as lower temperatures than the specified target temperature using the Regulating device 24 regulated. This ensures that in the cooling circuit only circulates the exact amount that is required for Reaching the engine setpoint temperature is required. This is it Particularly advantageous if the coolant pump 7 is speed-controlled means its delivery rate directly from the speed at which it rotates depends.

    Durch die in Fig. 1 dargestellte am Wasserkreislauf angeordnete Regelvorrichtung gemäß der Erfindung, die mit dem erfindungsgemäßen Verfahren arbeitet, ist sichergestellt, daß die Fördermenge sowohl im Bypassbetrieb, d. h. wenn die Kühlmittelflüssigkeit durch Umschaltung des Umschaltventiles 11 im Bypass 26 am Retarder 13 vorbeigeleitet wird wie auch im Fall der Zuschaltung des Retarders 13 stets ausreichend ist, um eine genügende Motorkühlleistung zur Verfügung zu stellen. Als Vorteil gegenüber dem bislang verwendeten Kühlmittelpumpen kann aber ein erhebliches Einsparpotential genutzt werden, da bei abgeschaltetem Retarder die Fördermenge der Wasserpumpe 7 wesentlich niedriger ausfällt, wodurch eine Kraftstoffeinsparung erzielt werden kann.Arranged on the water cycle as shown in FIG Control device according to the invention, with the inventive Procedure works, it is ensured that the delivery rate in both Bypass operation, d. H. if the coolant liquid by switching the Switching valve 11 in the bypass 26 bypasses the retarder 13 as even in the case of activation of the retarder 13 is always sufficient to to provide sufficient engine cooling capacity. As an advantage over The coolant pumps used so far can be a significant one Saving potential can be used because the retarder is switched off Delivery rate of the water pump 7 turns out significantly lower, resulting in a Fuel savings can be achieved.

    In Fig. 2 ist eine weitere Ausführungsform der Erfindung dargestellt, wobei in dem Kühlkreislauf neben der drehzahlgeregelten Pumpe 7 eine weitere Pumpe 30 vorgesehen ist. Die Pumpe 30 ist in dieser Ausführungsform vor dem Schaltventil 11 für den Bypass 26 angeordnet. Für gleiche Aggregate wie in Fig. 1 werden in Fig. 2 wiederum gleiche Bezugszeichen gewählt.2 shows a further embodiment of the invention, wherein in the cooling circuit in addition to the speed-controlled pump 7 another Pump 30 is provided. The pump 30 is in this embodiment the switching valve 11 for the bypass 26 is arranged. For the same units as in FIG. 1 the same reference numerals are again chosen in FIG. 2.

    Der Vorteil der Ausbildung gemäß Fig. 2 ist darin zu sehen, daß die drehzahlgeregelte Pumpe 7, die von der Regelvorrichtung 24 in Abhängigkeit der über den Sensor 20 aufgenommenen Motortemperatur geregelt wird, in ihrer Fördermenge sehr gering ausgelegt werden kann, da im Kühlkreislauf eine weitere Pumpe 30 vorgesehen ist, die in vorliegendem Ausführungsbeispiel fahrgeschwindigkeitsabhängig betrieben wird und für eine Grundfördermenge im Kühlkreislauf sorgt. Die Pumpe 30 ist so dimensioniert, daß sie bei nicht betriebenem Retarder, d. h. in dem Zustand, in dem das Kühlmittel am Retarder durch die Bypassleitung 26 vorbei geführt wird, ausreichend ist, um die für die Motorkühlung benötigte Pumpleistung zur Verfügung zu stellen. Wird nunmehr Kühlmittel als Arbeitsmedium durch den Retarder 13 geleitet und dieses durch den im Betrieb befindlichen Retarder weiter mit Wärme belastet, so reicht die Fördermenge der Pumpe 30 nicht mehr aus, um die maximale, zulässige Motortemperatur einzuhalten. In diesem Fall wird die Regelung ansprechen und die Regelvorrichtung die drehzahlgeregelte Pumpe 7 in Betrieb setzen, die dann genau mit einer solchen Drehzahl betrieben wird, daß eine zusätzliche Fördermenge zur Verfügung gestellt wird, um eine unzulässige Erwärmung des Motors zu verhindern. Die Regelvorrichtung arbeitet wiederum wie bei Fig. 1 beschrieben, d. h. bei Abweichungen von einem vorgegebenen Motortemperatur-Sollwert wird die Drehzahl der Pumpe 7 solange entsprechend eingestellt, bis diese vorgegebene Sollwert-Motortemperatur erreicht ist. Wie oben gesagt, erlaubt es die Regelung, den Kühlmittelkreislauf immer gerade so zu fahren, daß sich der Motor nahe an der maximal zulässigen Temperatur befindet. Dies hat, wie bereits oben aufgezeigt, eine erhebliche Kraftstoffeinsparung zur Folge.The advantage of the training shown in FIG. 2 is that the speed-controlled pump 7 depending on the control device 24 the motor temperature recorded via the sensor 20 is regulated in their delivery rate can be designed very low, because in the cooling circuit a further pump 30 is provided, which in the present Embodiment is operated depending on the vehicle speed and for provides a basic delivery rate in the cooling circuit. The pump 30 is like this dimensioned so that when the retarder is not operated, i. H. in that condition, in which the coolant passes the retarder through the bypass line 26 is sufficient to provide the pump power required for engine cooling to provide. Becomes coolant as a working medium passed the retarder 13 and this through the one in operation If the retarder continues to be exposed to heat, the delivery rate of the pump 30 is sufficient no longer sufficient to maintain the maximum permissible motor temperature. In In this case, the control will respond and the control device Start speed-controlled pump 7, which then exactly with one is operated such a speed that an additional flow rate for Is provided to undue heating of the engine prevent. The control device in turn operates as in FIG. 1 described, d. H. in the event of deviations from a specified one Motor temperature setpoint is the speed of pump 7 as long set accordingly until this specified setpoint motor temperature is reached. As stated above, the regulation allows the coolant circuit Always drive straight so that the engine is close to the maximum permissible temperature. As already shown above, this has one considerable fuel savings.

    In einer in Fig. 3 dargestellten dritten Ausführungsform werden wiederum für gleiche Aggregate dieselben Bezugsziffern wie schon in Fig. 1 und 2 verwendet. Nunmehr ist die weitere Pumpe 30 hinter dem Umschaltventil 11 unmittelbar vor dem Retarder 13 angeordnet. Die Grundlast zur Kühlmittelförderung übernimmt jetzt die drehzahlgeregelte Pumpe 7. Sie wird wiederum in Abhängigkeit von der Motortemperatur mittels der Regelvorrichtung 24 angesteuert und zwar derart, daß in Abhängigkeit vom vorgegebenen Sollwert und der Abweichung des Istwertes hiervon die drehzahlgeregelte Pumpe angesteuert wird. Die drehzahlgeregelte Pumpe kann in ihrer Fördermenge sehr gering ausgelegt werden, da sie nur die im Kühlmittelskreislauf ohne zugeschalteten Retarder anfallende Wärme abtransportieren muß. Wird nun der Retarder zugeschaltet, so wird auch die weitere Pumpe 30 zugeschaltet und die zur Kühlung erforderliche höhere Fördermenge hierdurch zur Verfügung gestellt. Im Gegensatz zu der Ausführungsform gemäß Fig. 2 wird also in dieser Ausführungsform die zusätzliche Kühlmittelmenge, die zur Reduktion der Wärmebelastung, die durch Zuschaltung des Retarders entsteht, von der weiteren Kühlmittelpumpe 30 gefördert.In a third embodiment shown in Fig. 3 are again for same aggregates the same reference numerals as in Figs. 1 and 2 used. The further pump 30 is now behind the changeover valve 11 arranged immediately before the retarder 13. The base load for The speed-controlled pump 7 now takes over coolant delivery again depending on the engine temperature using the Control device 24 controlled and in such a way that depending on predetermined target value and the deviation of the actual value from it speed-controlled pump is controlled. The speed-controlled pump can be interpreted in their delivery rate very low, since they only the in Coolant circuit without any heat generated by the retarder must be removed. If the retarder is now switched on, the another pump 30 switched on and the higher required for cooling Delivery volume made available by this. In contrast to the 2 is the embodiment in this embodiment additional amount of coolant used to reduce the heat load by switching on the retarder, from the other Coolant pump 30 promoted.

    Sowohl gemäß der Ausführungsform nach Fig. 2 wie auch nach Fig. 3 kann die Regelvorrichtung zusätzlich über eine Signalleitung 32 mit dem Umschaltventil 11 verbunden sein, um hierüber ein Zustandssignal zugeführt zu bekommen, das Auskunft darüber gibt, ob das Kühlmittel durch den Retarder oder über den Bypass an diesem vorbeigeleitet wird. Bei der Ausführungsform gemäß Fig. 2 ist es dann beispielsweise möglich, die Regelung mittels der Regelvorrichtung 24 nur dann zu aktivieren, wenn auf der Signalleitung 32 ein Zustandssignal anliegt, das angibt, das Kühlmittel durch den Retarder geleitet wird und dort als Arbeitsmedium dient.Both according to the embodiment according to FIG. 2 and according to FIG. 3 can the control device additionally via a signal line 32 with the Switching valve 11 may be connected in order to be supplied with a status signal to get information about whether the coolant through the Retarder or bypassed by this. In the 2, it is then possible, for example, the To activate control by means of the control device 24 only when on a signal is present on the signal line 32, which indicates the coolant is passed through the retarder and serves as the working medium there.

    Der Antrieb der drehzahlgeregelten Pumpen 7 kann mittels eines Elektromotores, der wiederum an den elektrischen Stromkreis des Fahrzeuges angeschlossen ist, betrieben werden. Die Ansteuerung der hierfür beispielsweise in Frage kommenden Elektromotoren sind dem Fachmann aus dem Stand der Technik, siehe hierzu beispielsweise "Dubbel, Taschenbuch für den Maschinenbau, 18. Auflage, 1995, Seiten V18 - V51 bekannt.The speed-controlled pumps 7 can be driven by means of a Electric motor, which in turn is connected to the electrical circuit of the vehicle connected. The control of this for example, electric motors that are suitable are known to the person skilled in the art the prior art, see, for example, "Dubbel, Paperback for mechanical engineering, 18th edition, 1995, pages V18 - V51 known.

    Selbstverständlich können neben dem Ausführungsbeispiel mit den dargestellten zwei Kühlmittelpumpen mehrere Kühlmittelpumpen vorgesehen sein, wovon eine oder mehrere drehzahlgeregelte Kühlmittelpumpen sind.Of course, in addition to the embodiment with the Two coolant pumps shown provided several coolant pumps be one or more of which are speed-controlled coolant pumps.

    Claims (19)

    1. A method for setting the engine temperature by means of a cooling circuit in which a cooling medium circulates, comprising at least one coolant pump as well as a retarder whose working medium is the coolant, with the method being characterized in that the temperature of the coolant is set by means of at least one speed-controlled coolant pump (7) depending on the engine temperature in such a way that a predetermined maximum engine temperature value is not exceeded irrespective of the operational state of the retarder, with the predetermined maximum temperature value being adjusted continually to the current engine output.
    2. A method as claimed in claim 1, characterized in that the engine temperature is determined continually.
    3. A method as claimed in one of the claims 1 or 2, characterized in that the retarder can be enabled or disabled.
    4. A method as claimed in one of the claims 1 to 3, characterized in that the coolant circuit comprises at least one further coolant pump (30) in addition to the at least one speed-controlled coolant pump (7).
    5. A method as claimed in claim 4, characterized in that the at least one further coolant pump (30) is operated depending on the engine speed.
    6. A method as claimed in claim 4, characterized in that the at least one further coolant pump (30) is operated depending on the driving speed.
    7. A method as claimed in claim 4, characterized in that the at least one further coolant pump (30) is operated depending on the retarder speed.
    8. A method as claimed in one of the claims 1 to 7, characterized in that the speed-controlled coolant pump (7) is configured in its output capacity in such a way that it ensures a sufficient cooling of the engine when the retarder is switched off.
    9. A method as claimed in one of the claims 4 to 8, characterized in that the at least one further coolant pump (30) is enabled when the retarder is activated, so that a sufficient cooling of the engine in this state is ensured.
    10. A method as claimed in claim 4 and one of the claims 5 to 8, characterized in that the speed-controlled coolant pump (7) is operated only when the retarder is enabled.
    11. A method as claimed in claim 10, characterized in that the at least one further coolant pump (30) is operated continuously and is configured in its output capacity in such a way that it ensures a sufficient cooling of the engine.
    12. A method as claimed in one of the claims 1 to 11, characterized in that the coolant is water or a water mixture.
    13. A method as claimed in one of the claims 1 to 12, characterized in that the retarder (13) is a primary retarder.
    14. A method as claimed in one of the claims 1 to 13, characterized in that the retarder (13) is a secondary retarder.
    15. An apparatus for setting the engine temperature with means for determining the engine temperature, a coolant circuit with at least one coolant pump for setting the engine temperature, with the same being configured as a speed-controlled coolant pump whose conveying quantity depends on its speed and the coolant circuit further comprises a retarder (13) whose working medium is the coolant of the cooling circuit, characterized in that a closed-loop control apparatus for the closed-loop control of the conveying quantity of the at least one coolant pump depending on the engine temperature is provided, which occurs in such a way that independent of the operational state of the retarder a predetermined maximum engine temperature which is continually adjusted to the current engine output is not exceeded.
    16. An apparatus as claimed in claim 15, characterized in that the cooling circuit further comprises a changeover valve (11).
    17. An apparatus as claimed in one of the claims 15 to 16, characterized in that the apparatus further comprises an activation apparatus for the changeover valve.
    18. An apparatus as claimed in one of the claims 15 to 17, characterized in that the apparatus further comprises an activation apparatus for at least one further pump.
    19. An apparatus as claimed in one of the claims 15 to 18, characterized in that the coolant circuit is a bypass conduit leading past the radiator.
    EP97909371A 1996-10-09 1997-10-08 Method and control of regulation of vehicle cooling circuit by means of a thermally regulated water pump Expired - Lifetime EP0931208B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    DE1996141558 DE19641558A1 (en) 1996-10-09 1996-10-09 Method and control for regulating the cooling circuit of a vehicle by means of a thermally controlled water pump
    DE19641558 1996-10-09
    PCT/EP1997/005545 WO1998015726A1 (en) 1996-10-09 1997-10-08 Method and control of regulation of vehicle cooling circuit by means of a thermally regulated water pump

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    EP0931208A1 EP0931208A1 (en) 1999-07-28
    EP0931208B1 true EP0931208B1 (en) 2003-03-12

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    DE (2) DE19641558A1 (en)
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    DE59709520D1 (en) 2003-04-17
    EP0931208A1 (en) 1999-07-28
    DE19641558A1 (en) 1998-04-16
    WO1998015726A1 (en) 1998-04-16

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