EP0931209B1 - Drive unit with a thermally regulated water pump - Google Patents

Drive unit with a thermally regulated water pump Download PDF

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Publication number
EP0931209B1
EP0931209B1 EP97910425A EP97910425A EP0931209B1 EP 0931209 B1 EP0931209 B1 EP 0931209B1 EP 97910425 A EP97910425 A EP 97910425A EP 97910425 A EP97910425 A EP 97910425A EP 0931209 B1 EP0931209 B1 EP 0931209B1
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EP
European Patent Office
Prior art keywords
coolant
drive unit
engine
speed
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
EP97910425A
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German (de)
French (fr)
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EP0931209A1 (en
Inventor
Peter Edelmann
Klaus Vogelsang
Peter Heilinger
Peter Rose
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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 EP0931209A1 publication Critical patent/EP0931209A1/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
    • 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

Definitions

  • the invention relates to a drive unit, in particular for a motor vehicle with an internal combustion engine and a transmission, as well as a cooling circuit comprising a coolant for cooling the engine.
  • 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
  • Quantity of coolant pumped through the cooling circuit without Consideration of the respective operating parameters e.g. overrun and Partial load operation.
  • Working medium is also the cooling medium for the engine. Then must go safe heat dissipation designed the flow rate of the coolant pump be that the heat is dissipated even when the retarder is switched on can be. 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).
  • this object is achieved by a drive unit according to the Claim 1 solved.
  • 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.
  • Temperature sensor 20 can be a means for determining the temperature Temperature sensor 20 on.
  • a control device 24 is connected via the signal line 22 Temperature signal supplied, which is the current motor temperature represents. It goes without saying, for example, with several Temperature sensors possible, the control device 24 a variety of To supply temperature signals and to determine the actual temperature value, which serves as a reference variable in the present control loop, a Averaging over a variety of temperature signals.
  • the Control device 24 itself is a maximum temperature value for the motor as Setpoint stored for the control loop.
  • this maximum Temperature setpoint is a single value for all engine operating conditions.
  • a value that follows the load state of the engine can be based on the Act directly on the pump speed control, i.e. the pump control is not only dependent on the temperature setpoint.
  • the detection of the Load state can be a torque sensor or the control unit for the Motor can be removed.
  • 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, in in the cooling circuit in addition to the speed-controlled pump 7 in the cooling circuit a further pump 30 is provided.
  • the pump 30 is in this Embodiment arranged upstream of the switching valve 11 for the bypass 26.
  • Fig. 1 For same aggregates as in Fig. 1 are again the same in Fig. 2 Reference number chosen.
  • 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 is directed past the retarder through the bypass line 26 is sufficient to provide the pumping 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 verhindem.
  • 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-sensitive 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 ".
  • coolant pumps be one or more of which are speed-controlled coolant pumps.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Description

Die Erfindung betrifft eine Antriebseinheit, insbesondere für ein Kraftfahrzeug mit einem Verbrennungsmotor und einem Getriebe, sowie einem Kühlkreislauf umfassend ein Kühlmittel zur Kühlung des Motors.The invention relates to a drive unit, in particular for a motor vehicle with an internal combustion engine and a transmission, as well as a cooling circuit comprising a coolant for cooling the engine.

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 Kühimittelmenge 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 Kühlmittelpumpe. 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 Kühlkreistauf gefördert, und zwar ohne Berücksichtigung der jeweiligen Betriebsparameter (z.B. Schubbetrieb und Teillastbetrieb). 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 ein 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 Quantity of coolant pumped through the cooling circuit without Consideration of the respective operating parameters (e.g. overrun and Partial load operation). This leads to unnecessary power consumption on the part of the engine, which in certain operating situations leads to a leads to unnecessarily high fuel consumption. This is particularly serious Problem when a retarder is inserted into the cooling circuit Working medium is also the cooling medium for the engine. Then must go safe heat dissipation designed the flow rate of the coolant pump be that the heat is dissipated even when the retarder is switched on can be. 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 one 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 too is provided (6, S.VI, column 1), its radiator acts on the engine cooling circuit in the the speed-controlled coolant pumps 8, 4, 12 are provided. In this engine cooling circuit, due to the regulation based on permanent detected critical component temperatures (S.VI; Sp.2) a predetermined Motor temperature not independent of the retarder operation that can be switched on and off exceeded.

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).

Es ist somit Aufgabe der Erfindung, eine Antriebseinheit anzugeben, mit dem die oben geschilderten Nachteile des Standes der Technik überwunden werden können.It is therefore an object of the invention to provide a drive unit with which the disadvantages of the prior art described above are overcome can be.

Erfindungsgemäß wird diese Aufgabe durch eine Antriebseinheit gemäß dem Anspruch 1 gelöst.According to the invention, this object is achieved by a drive unit according to the Claim 1 solved.

Vorteilhafte Weiterbildungen sind Gegenstand der abhängigen Ansprüche. Advantageous further developments are the subject of the dependent Expectations.

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 erfindungsgemäße Antriebseinheit.
  • Fig. 2 eine erfindungsgemäße Antriebseinheit mit einer weiteren Kühlmittelpumpe repräsentativ für Ausführungsformen mit mehreren Kühlmittelpumpen.
  • Fig. 3 eine alternative Ausführungsform der Erfindung gemäß Fig. 2.
    • Show it:
  • Fig. 1 shows a drive unit according to the invention.
  • Fig. 2 shows a drive unit according to the invention with a further coolant pump representative of embodiments with several coolant pumps.
  • 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, beispielsweise in der 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 mit mehreren Temperatursensoren möglich, der Regelvorrichtung 24 eine Vielzahl von Temperatursignalen zuzuleiten und zur Bestimmung des Temperaturlstwertes, die 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 Temeperatursollwert abhängig. Die Erkennung des Lastzustandes kann einem Drehmomentsensor oder der Regeleinheit für den Motor 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, for example, positioned in the away from the engine become. A control device 24 is connected via the signal line 22 Temperature signal supplied, which is the current motor temperature represents. It goes without saying, for example, with several Temperature sensors possible, the control device 24 a variety of To supply temperature signals and to determine the actual temperature value, which serves as a reference variable in the present control loop, a Averaging over a variety of temperature signals. In the Control device 24 itself is a maximum temperature value for the motor as Setpoint stored for the control loop. It is possible that this maximum Temperature setpoint is a single value for all engine operating conditions. Likewise, a value that follows the load state of the engine can be based on the Act directly on the pump speed control, i.e. the pump control is not only dependent on the temperature setpoint. The detection of the Load state can be a torque sensor or the control unit for the Motor can be removed. There are now different control algorithms conceivable. So the speed-controlled coolant pump 7 with a certain constant speed are operated and the control takes effect only on when the engine temperature is the specified maximum Temperature value exceeds. It is then adjusted, i. H. the Flow increased.

    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, bei in dem Kühlkreislauf neben der drehzahlgeregelten Pumpe 7 im Kühlkreislauf 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, in in the cooling circuit in addition to the speed-controlled pump 7 in the cooling circuit a further pump 30 is provided. The pump 30 is in this Embodiment arranged upstream of the switching valve 11 for the bypass 26. For same aggregates as in Fig. 1 are again the same in Fig. 2 Reference number chosen.

    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 gelenkt wird, ausreichend ist, um die für die Motorkühlung benötigte Pumpieistung 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 verhindem. 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 is directed past the retarder through the bypass line 26 is sufficient to provide the pumping 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 verhindem. 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 drehzahlgeregeite 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 Kühimittelmenge, 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-sensitive 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 ".

    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 (6)

    1. A drive unit with an internal combustion engine (1) and a gear unit as well as a cooling circuit (3) comprising a coolant for cooling the internal combustion engine (1), with the at least one speed-controlled coolant pump (7) being arranged for conveying the coolant in the coolant circuit and the coolant circuit (3) comprising in addition to the at least one speed-controlled coolant pump (7) at least one further coolant pump (30), with the at least one further coolant pump (30) being driven dependent on the driving speed, and the drive unit comprises means for determining the engine temperature as well as a closed-loop control apparatus (24) for the closed-loop control of the conveying quantity of the speed-controlled coolant pump (7) depending on the determined engine temperature as well as a secondary retarder (13) which is flowed through by the coolant and the closed-loop control apparatus (24) comprises a control algorithm, characterized in that the same activates the speed-controlled coolant pump (7) in such a way that the conveying quantity is always dimensioned in such a way that a predetermined maximum temperature value of the engine (1) independent of the operational state of the retarder is not exceeded.
    2. A drive unit as claimed in claim 1, characterized in that the drive unit further comprises a changeover valve (11).
    3. A drive unit as claimed in one of the claims 1 to 2, characterized in that the at least one speed-controlled coolant pump (7) is configured in its output capacity in such a way that it ensures a sufficient cooling of the engine (1) when the retarder (13) is disabled.
    4. A drive unit as claimed in one of the claims 1 to 3, characterized in that the at least one further coolant pump (30) is configured in its output capacity in such a way that it ensures a sufficient cooling of the engine (1) when the retarder (13) is disabled.
    5. A drive unit as claimed in one of the claims 1 to 4, characterized in that the coolant of the coolant circuit (3) is water or a water mixture.
    6. A drive unit as claimed in one of the claims 1 to 5, characterized in that the coolant circuit (3) comprises a bypass conduit (40) which leads past the radiator (5).
    EP97910425A 1996-10-09 1997-10-08 Drive unit with a thermally regulated water pump Expired - Lifetime EP0931209B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    DE19641559A DE19641559A1 (en) 1996-10-09 1996-10-09 Drive unit with thermally controlled water pump
    DE19641559 1996-10-09
    PCT/EP1997/005544 WO1998015725A1 (en) 1996-10-09 1997-10-08 Drive unit with a thermally regulated water pump

    Publications (2)

    Publication Number Publication Date
    EP0931209A1 EP0931209A1 (en) 1999-07-28
    EP0931209B1 true EP0931209B1 (en) 2003-05-07

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    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP97910425A Expired - Lifetime EP0931209B1 (en) 1996-10-09 1997-10-08 Drive unit with a thermally regulated water pump

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    DE (2) DE19641559A1 (en)
    WO (1) WO1998015725A1 (en)

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    Also Published As

    Publication number Publication date
    DE19641559A1 (en) 1998-04-16
    WO1998015725A1 (en) 1998-04-16
    DE59710060D1 (en) 2003-06-12
    EP0931209A1 (en) 1999-07-28

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