EP0576639B1 - Method and device for operating the drive to internal-combustion engine auxiliaries - Google Patents

Method and device for operating the drive to internal-combustion engine auxiliaries Download PDF

Info

Publication number
EP0576639B1
EP0576639B1 EP92924692A EP92924692A EP0576639B1 EP 0576639 B1 EP0576639 B1 EP 0576639B1 EP 92924692 A EP92924692 A EP 92924692A EP 92924692 A EP92924692 A EP 92924692A EP 0576639 B1 EP0576639 B1 EP 0576639B1
Authority
EP
European Patent Office
Prior art keywords
combustion engine
speed
drive
phase generator
internal
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
EP92924692A
Other languages
German (de)
French (fr)
Other versions
EP0576639A1 (en
Inventor
Donatus Wichelhaus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dr Ing HCF Porsche AG
Original Assignee
Dr Ing HCF Porsche AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dr Ing HCF Porsche AG filed Critical Dr Ing HCF Porsche AG
Publication of EP0576639A1 publication Critical patent/EP0576639A1/en
Application granted granted Critical
Publication of EP0576639B1 publication Critical patent/EP0576639B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B67/00—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for
    • F02B67/04—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus
    • 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
    • F01P5/12—Pump-driving arrangements
    • 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
    • F01P2025/08—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/60—Operating parameters
    • F01P2025/62—Load

Definitions

  • the invention relates to a method and an apparatus for carrying out the method according to the preambles of claims 1 and 6.
  • a generator system for an internal combustion engine in which a generator is driven by the internal combustion engine via an intermediate drive.
  • the generator speed can thus be influenced independently of the speed of the internal combustion engine.
  • the generator speed can be reduced via this electronically controllable intermediate drive. Complete decoupling at full load is also possible.
  • This intermediate drive can be used to adapt the generator speed to the voltage requirements of the vehicle electrical system.
  • the generator control can take place on the basis of different maps, which were determined by test bench tests and take into account different criteria such as power requirement, consumption, exhaust gas and driving behavior.
  • a time-controlled excitation current is fed to the three-phase generator.
  • the excitation current is set at one time interval
  • the controller is switched on and off in such a way that a specific, first average excitation current is set at a constant on-board voltage. So that at a second, higher generator speed, the on-board voltage permitted for the on-board electrical system of the motor vehicle is regulated to its setpoint, the controller changes the clock signal in such a way that the switched-off time components increase and a second, middle excitation current is set, which is lower than the first.
  • the on-board voltage induced in the generator which is dependent on the excitation current and the speed, remains constant.
  • DE-PS 31 24 102 discloses a consumer-current-dependent switchover between a higher and a lower drive speed of an alternator.
  • the transmission upstream of the alternator has a clutch actuated by a control device, which performs the speed changeover in such a way that the higher drive speed is only maintained when a low engine speed and at the same time a high current requirement is present at the alternator.
  • the current requirement is fed to a regulator for the excitation current, which in turn is fed to the control device.
  • a planetary gear is arranged coaxially on a crankshaft stub, the sun gear of which is provided with an electromagnetically lockable clutch disc and the ring gear of which drives auxiliary units.
  • the clutch disc is switched depending on several parameters, for example the battery charging current or the cooling water temperature of the internal combustion engine.
  • the invention is based on the object of providing a method and a device for operating an auxiliary unit drive of an internal combustion engine which enables demand-controlled drive of a three-phase generator and at least one additional auxiliary unit.
  • This method advantageously enables a demand-controlled drive of individual auxiliary units, such as, for example, by engaging the excitation current supplied to the three-phase generator (alternator) in combination with a differential gear arranged between the internal combustion engine and the auxiliary units. a water pump.
  • the power delivered by the internal combustion engine to the differential gear at a constant speed can be assumed to be constant and is distributed to these units in an initially constant torque ratio depending on the gearbox design.
  • the drive torque of the water pump can be assumed to be constant, while that of the alternator depends on the excitation current.
  • the controller When the internal combustion engine is cold started, the controller is supplied, for example, with a signal dependent on the cooling water temperature, which changes the clocking of the alternator excitation current. With a cold internal combustion engine, little or no cooling water throughput is desired.
  • the on-board voltage induced in the alternator depends directly on the excitation current and the drive speed of the alternator. If the excitation current falls and the drive torque of the alternator is reduced by a certain amount, the differential speed increases the drive speed and thereby keeps the on-board voltage constant. Due to the balancing effect of the planetary gear, the drive speed of the water pump is reduced.
  • a high gear ratio with respect to the alternator can be achieved, so that the electrical requirement e.g. is covered even at idle speed.
  • the alternator can thus be operated in a favorable efficiency range of its map.
  • the second auxiliary unit for example a water pump.
  • the power consumption is based on the cooling water throughput of the internal combustion engine at full load and maximum speed. At partial load or at low engine speeds, the cooling requirement of the internal combustion engine drops to up to a third of the maximum cooling capacity.
  • the method according to the invention enables a demand-controlled drive of the water pump, in which, when the cooling water temperature is low, the differential gear lowers the drive speed of the water pump and increases the increased cooling demand when the internal combustion engine is heated.
  • the load- or cooling water temperature-dependent signal is supplied only when the cooling water temperature falls below a specified limit. If the current cooling water temperature is below the limit value, the clocking of the excitation current is changed so that this excitation current drops. As a result, the drive torque of the alternator drops and its speed increases, the speed of the water pump decreases.
  • a locking device can be arranged between the output of the planetary gear and the water pump, which stops the water pump on a cold start. This increases the speed of the alternator.
  • the cooling capacity can additionally be regulated between a third and zero of the maximum cooling capacity.
  • an auxiliary unit drive driven by a crankshaft 1 is arranged.
  • the crankshaft 1 is connected to a planet carrier 2 of a differential gear designed as a planetary gear 3.
  • a first output 5 designed as a ring gear 4 drives a three-phase generator 7 acting as an alternator by means of a belt drive 6.
  • a second output 9 acting as a sun gear 8 is connected to a water pump 11 by means of a further belt transmission 10.
  • a belt 12 of the transmission 10 wraps around a disk 13 of the water pump 11, an electromagnetic clutch 15 acting as a locking device being arranged between this disk 13 and a shaft 14 of the water pump 11.
  • a control unit 20 processes the speed NL of the generator 7, the speed n of the internal combustion engine, a load-dependent signal SL and a cooling water temperature-dependent signal ST.
  • a lower limit GT for the signal ST is stored in the control unit 20.
  • the clutch 15 is switched on or off by the control unit 20 as required, via a line 21.
  • a controller 22 for an excitation current IE supplied to the generator 7 is supplied with a clock signal TN as a function of the speed NL and a clock signal TS as a function of the signals SL and ST.
  • the excitation current IE is clocked in a known manner as a function of the generator speed NL via the signal TN.
  • the total power PG transmitted from the internal combustion engine into the differential is divided into a drive torque ML with the speed NL supplied to the generator 7 and a drive torque MW supplied with the water pump 11 with a speed NW according to the number of teeth of the planetary gear 3.
  • the belt transmission 6 has a transmission ratio of one to two point five (1: 2.5), that of the transmission 10 is one to one (1: 1).
  • the torque ratio ML / MW depends on the characteristic diagrams of the auxiliary units in which the power is plotted against the drive speed and can be assumed, for example, to be four.
  • the clock signal TS overlaps the clock signal TN and the excitation current IE directly regulates the drive torque ML as required and indirectly via the planetary gear 3 the speed NW of the water pump 11.
  • a change in the alternator speed LM by e.g. 1000 l / min results in a change in the speed of the ring gear 4 of 400 1 / min due to the transmission ratio of the belt operation 6 of 1: 2.5.
  • the water pump speed NW changes by 1600 l / min.
  • the value can be reduced by a certain amount if the limit value GT is undershot Water pump 11 are braked by means of the clutch 15.
  • the speed NL increases and the excitation current IE is further reduced to keep the on-board voltage UB constant.
  • the cooling capacity can additionally be regulated in the range from zero to approximately 0.3 of the full-load cooling capacity.
  • the load signal SL which e.g. Depends directly on the throttle valve position on the internal combustion engine, only has an influence on the controller 22 as long as ST is below the limit value GT.
  • crankshaft 1 can e.g. be connected to the sun gear 8 and the water pump 11 to the planet carrier 2.
  • a second transmission gear can be arranged between the crankshaft 1 and the differential gear.
  • additional auxiliary units such as a secondary air pump required during a cold start can be installed in the auxiliary drive.

Landscapes

  • 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)

Abstract

The invention concerns a differential gear (3) driven by the crankshaft (1) of an internal-combustion engine and which distributes the drive torque as a function of the number of teeth on the differential gear (3) to engine auxiliaries (7, 11) driven by this differential gear (3). An exciter current (IE) fed to an auxiliary (three-phase alternator 7) is regulated as a function of load and/or cooling-water signals (SL, ST), and the drive torque (ML) to the alternator (7) varied accordingly. In order to maintain a constant alternator voltage (UB) the rotational speed (NL) of the alternator (7) is varied as is, by means of the differential gear (3), the rotational speed of another auxiliary (water pump 11). The cooling capacity of the engine can thus be controlled as a function of the cooling or load requirements.

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Durchführung des Verfahrens nach den Oberbegriffen der Ansprüche 1 und 6.The invention relates to a method and an apparatus for carrying out the method according to the preambles of claims 1 and 6.

Aus der DE 37 29 772 A1 ist eine Generatoranlage für eine Brennkraftmaschine bekannt, bei der ein Generator über einen Zwischenantrieb von der Brennkraftmaschine angetrieben ist. Die Generatordrehzahl kann damit unabhängig von der Drehzahl der Brennkraftmaschine beeinflußt werden. Bei starker Belastung der Brennkraftmaschine und bei guter Spannungsversorgung der Batterie und weiterer Verbraucher kann die Generatordrehzahl über diesen elektronisch regelbaren Zwischentrieb verringert werden. Eine vollständige Abkopplung bei Vollast ist ebenfalls möglich. Über diesen Zwischenantrieb kann eine Drehzahlanpassung des Generators an die Spannungserfordernisse des Bordnetzes erfolgen. Die Generatorregelung kann dabei anhand unterschiedlicher Kennfelder erfolgen, die durch Prüfstandsversuche ermittelt wurden und unterschiedliche Kriterien wie Leistungsbedarf, Verbrauch, Abgas und Fahrverhalten berücksichtigen.From DE 37 29 772 A1, a generator system for an internal combustion engine is known, in which a generator is driven by the internal combustion engine via an intermediate drive. The generator speed can thus be influenced independently of the speed of the internal combustion engine. When the internal combustion engine is under heavy load and the battery and other consumers are well supplied with voltage, the generator speed can be reduced via this electronically controllable intermediate drive. Complete decoupling at full load is also possible. This intermediate drive can be used to adapt the generator speed to the voltage requirements of the vehicle electrical system. The generator control can take place on the basis of different maps, which were determined by test bench tests and take into account different criteria such as power requirement, consumption, exhaust gas and driving behavior.

Aus der DE 22 13 303 C2 ist es weiterhin bekannt, mehrere Nebenaggregate über ein stufenlos regelbares Zwischengetriebe anzutreiben. Dabei kann bei geringer Drehzahl bzw. geringer Last der Brennkraftmaschine und niedriger Batteriespannung die Drehzahl des Generators erhöht werden. Bei hohen Kühlwassertemperaturen wird über das Zwischengetriebe die Drehzahl eines Kühlluftgebläses erhöht. Eine Erhöhung der Drehzahl aufgrund eines höheren Drehzahlbedarfes eines einzelnen Nebenaggregates führt dabei jedoch auch zur Erhöhung der Drehzahl der weiteren Nebenaggregate.From DE 22 13 303 C2 it is also known to drive a number of auxiliary units via a continuously variable intermediate gear. The speed of the generator can be increased at low speed or low load of the internal combustion engine and low battery voltage. At high cooling water temperatures, the speed of a cooling air blower is increased via the intermediate gear. However, an increase in the speed due to a higher speed requirement of an individual auxiliary unit also leads to an increase in the rotational speed of the other auxiliary units.

Um den Strom- bzw. Spannungsbedarf von elektrischen Verbrauchern in einem Kraftfahrzeug zu decken, wird dem Drehstromgenerator ein zeitlich getakteter Erregerstrom zugeführt. Hierbei wird beispielsweise bei einer ersten, niedrigen Generatordrehzahl der Erregerstrom in festgelegten zeitlichen Abständen von einem Regler so ein- bzw. ausgeschaltet, daß sich ein bestimmter, erster mittlerer Erregerstrom bei einer konstanten Bordspannung einstellt. Damit bei einer zweiten, höheren Generatordrehzahl die für das Bordnetz des Kraftfahrzeuges zulässige Bordspannung auf ihren Sollwert geregelt wird, verändert der Regler das Taktsignal dahingehend, daß die ausgeschalteten Zeitanteile zunehmen und sich ein zweiter, mittlerer Erregerstrom einstellt, welcher niedriger ist als der erste. Infolgedessen bleibt die von dem Erregerstrom und der Drehzahl abhängige, in dem Generator induzierte Bordspannung konstant.In order to cover the current or voltage requirements of electrical consumers in a motor vehicle, a time-controlled excitation current is fed to the three-phase generator. In this case, for example, at a first, low generator speed, the excitation current is set at one time interval The controller is switched on and off in such a way that a specific, first average excitation current is set at a constant on-board voltage. So that at a second, higher generator speed, the on-board voltage permitted for the on-board electrical system of the motor vehicle is regulated to its setpoint, the controller changes the clock signal in such a way that the switched-off time components increase and a second, middle excitation current is set, which is lower than the first. As a result, the on-board voltage induced in the generator, which is dependent on the excitation current and the speed, remains constant.

Weiterhin ist es bekannt, zwischen einem Abtrieb einer Brennkraftmaschine und einem Antrieb von Nebenaggregaten ein Getriebe anzuordnen, welches parameterabhängig eine Anpassung der Antriebsdrehzahl der Nebenaggregate an die Abtriebsdrehzahl der Brennkraftmaschine vornimmt. Beispielsweise ist in der DE-PS 31 24 102 eine verbraucherstromabhängige Umschaltung zwischen einer höheren und einer niedrigeren Antriebsdrehzahl einer Lichtmaschine offenbart. Das der Lichtmaschine vorgeschaltete Getriebe weist eine von einer Steuereinrichtung betätigte Kupplung auf, welche die Drehzahlumschaltung derart vornimmt, daß die höhere Antriebsdrehzahl nur dann erhalten bleibt, wenn eine niedrige Brennkraftmaschinendrehzahl und gleichzeitig ein hoher Strombedarf an der Lichtmaschine anliegt. Der Strombedarf wird einem Regler für den Erregerstrom zugeführt, der seinerseits der Steuereinrichtung zugeführt wird.Furthermore, it is known to arrange a gearbox between an output of an internal combustion engine and a drive of auxiliary units, which gear-dependent adaptation of the drive speed of the auxiliary units to the output speed of the internal combustion engine. For example, DE-PS 31 24 102 discloses a consumer-current-dependent switchover between a higher and a lower drive speed of an alternator. The transmission upstream of the alternator has a clutch actuated by a control device, which performs the speed changeover in such a way that the higher drive speed is only maintained when a low engine speed and at the same time a high current requirement is present at the alternator. The current requirement is fed to a regulator for the excitation current, which in turn is fed to the control device.

In der DE-OS 28 01 812 ist koaxial auf einem Kurbelwellenstumpf ein Planetengetriebe angeordnet, dessen Sonnenrad mit einer elektromagnetisch festbremsbaren Kupplungsscheibe versehen ist und dessen Hohlrad Nebenaggregate antreibt. Bei freiem Sonnenrad werden alle Nebenaggregate mit einer niedrigen Drehzahl angetrieben, bei festem Sonnenrad erhöht sich die Abtriebsdrehzahl des Hohlrades, so daß alle Nebenaggregate mit einer gemeinsamen, höheren Drehzahl angetrieben werden. Das Umschalten der Kupplungsscheibe erfolgt in Abhängigkeit mehrerer Parameter, z.B. des Batterieladestromes oder der Kühlwassertemperatur der Brennkraftmaschine.In DE-OS 28 01 812, a planetary gear is arranged coaxially on a crankshaft stub, the sun gear of which is provided with an electromagnetically lockable clutch disc and the ring gear of which drives auxiliary units. When the sun gear is free, all auxiliary units are driven at a low speed, with a fixed sun gear, the output speed of the ring gear increases, so that all auxiliary units are driven at a common, higher speed. The clutch disc is switched depending on several parameters, for example the battery charging current or the cooling water temperature of the internal combustion engine.

Aus dem genannten Stand der Technik ist es bekannt, die Drehzahl des Nebenaggregatantriebes parameterabhängig zwischen einer niedrigen und einer höheren Drehzahl umzuschalten. Eine stufenlose Anpassung oder ein Abschalten von einem oder mehreren Nebenaggregaten ist nicht möglich.From the prior art mentioned, it is known to switch the speed of the auxiliary drive depending on the parameters between a low and a higher speed. It is not possible to continuously adjust or switch off one or more auxiliary units.

Der Erfindung liegt demgegenüber die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zum Betreiben eines Nebenaggregateantriebes einer Brennkraftmaschine zu schaffen, welche einen bedarfsgeregelten Antrieb eines Drehstromgenerators und mindestens eines weiteren Nebenaggregates ermöglicht.In contrast, the invention is based on the object of providing a method and a device for operating an auxiliary unit drive of an internal combustion engine which enables demand-controlled drive of a three-phase generator and at least one additional auxiliary unit.

Die Lösung dieser Aufgabe gelingt mit den Merkmalen der Patentansprüche 1 und 6.This object is achieved with the features of claims 1 and 6.

Dieses Verfahren ermöglicht vorteilhafterweise über den Eingriff in den dem Drehstromgenerator (Lichtmaschine) zugeführten Erregerstrom in Kombination mit einem zwischen der Brennkraftmaschine und den Nebenaggregaten angeordneten Ausgleichsgetriebe einen bedarfsgeregelten Antrieb einzelner Nebenaggregate, wie z.B. einer Wasserpumpe.This method advantageously enables a demand-controlled drive of individual auxiliary units, such as, for example, by engaging the excitation current supplied to the three-phase generator (alternator) in combination with a differential gear arranged between the internal combustion engine and the auxiliary units. a water pump.

Die bei einer konstanten Drehzahl von der Brennkraftmaschine an das Ausgleichsgetriebe abgegebene Leistung kann als konstant angenommen werden und wird in Abhängigkeit des Getriebeaufbaues in einem zunächst konstanten Momentenverhältnis auf diese Aggregate aufgeteilt. Das notwendige ... Antriebsmoment der Wasserpumpe kann als konstant angenommen werden, während das der Lichtmaschine von der Erregerstromstärke abhängt.The power delivered by the internal combustion engine to the differential gear at a constant speed can be assumed to be constant and is distributed to these units in an initially constant torque ratio depending on the gearbox design. The necessary ... The drive torque of the water pump can be assumed to be constant, while that of the alternator depends on the excitation current.

Bei einem Kaltstart der Brennkraftmaschine wird dem Regler z.B. ein kühlwassertemperaturabhängiges Signal zugeführt, welches das Takten des Lichtmaschinenerregerstromes verändert. Bei kalter Brennkraftmaschine ist nur ein geringer oder gar kein Kühlwasserdurchsatz erwünscht. Die in der Lichtmaschine induzierte Bordspannung hängt direkt von dem Erregerstrom und der Antriebsdrehzahl der Lichtmaschine ab. Bei sinkenden Erregerstrom und dadurch um einen bestimmten Betrag verringerten Antriebsmoment der Lichtmaschine wird durch das Ausgleichsgetriebe die Antriebsdrehzahl erhöht und dadurch die Bordspannung konstant gehalten.
Aufgrund der ausgleichenden Wirkung des Planetengetriebes verringert sich die Antriebsdrehzahl der Wasserpumpe.When the internal combustion engine is cold started, the controller is supplied, for example, with a signal dependent on the cooling water temperature, which changes the clocking of the alternator excitation current. With a cold internal combustion engine, little or no cooling water throughput is desired. The on-board voltage induced in the alternator depends directly on the excitation current and the drive speed of the alternator. If the excitation current falls and the drive torque of the alternator is reduced by a certain amount, the differential speed increases the drive speed and thereby keeps the on-board voltage constant.
Due to the balancing effect of the planetary gear, the drive speed of the water pump is reduced.

Vorteilhafterweise kann durch Anwenden dieses Verfahrens bei niedriger Brennkraftmaschinendrehzahl ein hohes Übersetzungsverhältnis bezüglich der Lichtmaschine erreicht werden, so daß der elektrische Bedarf z.B. auch bei Leerlaufdrehzahl gedeckt ist. Andererseits ist ein Absenken des Übersetzungsverhältnisses bei hohen Brennkraftmaschinendrehzahlen möglich. Hierdurch sinkt die Leistungsaufnahme und die von dem Lüfterrad der Lichtmaschine verursachte Geräuschemission. Die Lichtmaschine kann somit in einem günstigen Wirkungsgradbereich ihres Kennfeldes betrieben werden.Advantageously, by using this method at a low engine speed, a high gear ratio with respect to the alternator can be achieved, so that the electrical requirement e.g. is covered even at idle speed. On the other hand, it is possible to lower the gear ratio at high engine speeds. This reduces the power consumption and the noise emission caused by the fan wheel of the alternator. The alternator can thus be operated in a favorable efficiency range of its map.

Weitere Vorteile werden bezüglich des zweiten Nebenaggregats, z.B. einer Wasserpumpe, erzielt. Bei bekannter Auslegung einer herkömmlich angetriebenen Wasserpumpe wird die Leistungsaufnahme auf den Kühlwasserdurchsatz der Brennkraftmaschine bei Vollast und maximaler Drehzahl bezogen. Bei Teillast bzw. niedrigen Drehzahlen sinkt der Kühlungsbedarf der Brennkraftmaschine auf bis zu ein Drittel der maximalen Kühlleistung. Das erfindungsgemäße Verfahren ermöglicht einen bedarfsgeregelten Antrieb der Wasserpumpe, in dem bei niedriger Kühlwassertemperatur das Ausgleichsgetriebe die Antriebsdrehzahl der Wasserpumpe senkt und bei erwärmter Brennkraftmaschine dem gestiegenen Kühlbedarf entsprechend erhöht.Further advantages are achieved with regard to the second auxiliary unit, for example a water pump. With a known design of a conventionally driven water pump, the power consumption is based on the cooling water throughput of the internal combustion engine at full load and maximum speed. At partial load or at low engine speeds, the cooling requirement of the internal combustion engine drops to up to a third of the maximum cooling capacity. The method according to the invention enables a demand-controlled drive of the water pump, in which, when the cooling water temperature is low, the differential gear lowers the drive speed of the water pump and increases the increased cooling demand when the internal combustion engine is heated.

In vorteilhafter Ausgestaltung der Erfindung erfolgt die Zufuhr des last- bzw. kühlwassertemperaturabhängigen Signales nur bei Unterschreiten eines festgelegten Grenzwertes für die Kühlwassertemperatur. Liegt die aktuelle Kühlwassertemperatur unterhalb des Grenzwertes, wird das Takten des Erregerstromes dahingehend verändert, daß dieser Erregerstrom sinkt. Infolgedessen sinkt das Antriebsmoment der Lichtmaschine und ihre Drehzahl steigt, die Drehzahl der Wasserpumpe sinkt.In an advantageous embodiment of the invention, the load- or cooling water temperature-dependent signal is supplied only when the cooling water temperature falls below a specified limit. If the current cooling water temperature is below the limit value, the clocking of the excitation current is changed so that this excitation current drops. As a result, the drive torque of the alternator drops and its speed increases, the speed of the water pump decreases.

In weiterer Ausgestaltung kann zwischen dem Abtrieb des Planetengetriebes und der Wasserpumpe eine Feststellvorrichtung angeordnet sein, die bei einem Kaltstart die Wasserpumpe stillegt. Hierdurch erhöht sich die Drehzahl der Lichtmaschine. Bei regelbarer Auslegung dieser Feststellvorrichtung kann die Kühlleistung zusätzlich zwischen einem Drittel und Null der maximalen Kühlleistung geregelt werden.In a further embodiment, a locking device can be arranged between the output of the planetary gear and the water pump, which stops the water pump on a cold start. This increases the speed of the alternator. With a controllable design of this locking device, the cooling capacity can additionally be regulated between a third and zero of the maximum cooling capacity.

Ein Ausführungsbeispiel der Erfindung wird anhand einer Zeichnung näher erläutert.An embodiment of the invention is explained in more detail with reference to a drawing.

Es zeigen:

Fig. 1
schematisch einen Nebenaggregateantrieb an einer Brennkraftmaschine mit Nebenaggregaten und
Fig. 2
eine Draufsicht des Antriebes gemäß Fig. 1.
Show it:
Fig. 1
schematically an auxiliary drive on an internal combustion engine with auxiliary units and
Fig. 2
2 shows a top view of the drive according to FIG. 1.

Endseitig einer nicht gezeigten Brennkraftmaschine ist ein von einer Kurbelwelle 1 angetriebener Nebenaggregateantrieb angeordnet. Die Kurbelwelle 1 ist mit einem Planetenträger 2 eines als Planetengetriebe 3 ausgebildeten Ausgleichsgetriebes verbunden. Ein als Hohlrad 4 ausgebildeter erster Abtrieb 5 treibt mittels eines Umschlingungstriebes 6 einen als Lichtmaschine wirkenden Drehstromgenerator 7 an.
Ein als Sonnenrad 8 wirkender zweiter Abtrieb 9 ist mittels eines weiteren Umschlingungsgetriebes 10 mit einer Wasserpumpe 11 verbunden.
Ein Riemen 12 des Getriebes 10 umschlingt eine Scheibe 13 der Wasserpumpe 11, wobei zwischen dieser Scheibe 13 und einer Welle 14 der Wasserpumpe 11 eine als Feststellvorrichtung wirkende, elektromagnetische Kupplung 15 angeordnet ist.At the end of an internal combustion engine, not shown, an auxiliary unit drive driven by a crankshaft 1 is arranged. The crankshaft 1 is connected to a planet carrier 2 of a differential gear designed as a planetary gear 3. A first output 5 designed as a ring gear 4 drives a three-phase generator 7 acting as an alternator by means of a belt drive 6.
A second output 9 acting as a sun gear 8 is connected to a water pump 11 by means of a further belt transmission 10.
A belt 12 of the transmission 10 wraps around a disk 13 of the water pump 11, an electromagnetic clutch 15 acting as a locking device being arranged between this disk 13 and a shaft 14 of the water pump 11.

Ein Steuergerät 20 verarbeitet die Drehzahl NL des Generators 7, die Drehzahl n der Brennkraftmaschine, ein lastabhängiges Signal SL und ein kühlwassertemperaturabhängiges Signal ST. In dem Steuergerät 20 ist ein unterer Grenzwert GT für das Signal ST abgespeichert. Die Kupplung 15 wird bedarfsabhängig über eine Leitung 21 von dem Steuergerät 20 ein- bzw. ausgeschaltet. Einem Regler 22 für einen dem Generator 7 zugeführten Erregerstrom IE wird in Abhängigkeit der Drehzahl NL ein Taktsignal TN und in Abhängigkeit der Signale SL und ST ein Taktsignal TS zugeführt.A control unit 20 processes the speed NL of the generator 7, the speed n of the internal combustion engine, a load-dependent signal SL and a cooling water temperature-dependent signal ST. A lower limit GT for the signal ST is stored in the control unit 20. The clutch 15 is switched on or off by the control unit 20 as required, via a line 21. A controller 22 for an excitation current IE supplied to the generator 7 is supplied with a clock signal TN as a function of the speed NL and a clock signal TS as a function of the signals SL and ST.

Im Betrieb der Brennkraftmaschine mit einem Signal ST oberhalb des Grenzwertes GT erfolgt das Takten des Erregerstromes IE in bekannter Weise in Abhängigkeit der Generatordrehzahl NL über das Signal TN.When the internal combustion engine is operating with a signal ST above the limit value GT, the excitation current IE is clocked in a known manner as a function of the generator speed NL via the signal TN.

Die gesamte, von der Brennkraftmaschine in das Ausgleichsgetriebe übertragene Leistung PG wird entsprechend der Zähnezahlen des Planetengetriebes 3 in ein dem Generator 7 zugeführtes Antriebsmoment ML mit der Drehzahl NL und ein der Wasserpumpe 11 zugeführtes Antriebsmoment MW mit einer Drehzahl NW aufgeteilt.
Das Umschlingungsgetriebe 6 hat ein Übersetzungsverhältnis von Eins zu Zwei Komma Fünf (1: 2,5), das des Getriebes 10 beträgt Eins zu Eins (1:1). Das Momentenverhältnis ML/MW hängt von den Kennfeldern der Nebenaggregate ab, in denen die Leistung über der Antriebsdrehzahl aufgetragen ist, und kann beispielsweise mit einem Wert von vier angenommen werden.The total power PG transmitted from the internal combustion engine into the differential is divided into a drive torque ML with the speed NL supplied to the generator 7 and a drive torque MW supplied with the water pump 11 with a speed NW according to the number of teeth of the planetary gear 3.
The belt transmission 6 has a transmission ratio of one to two point five (1: 2.5), that of the transmission 10 is one to one (1: 1). The torque ratio ML / MW depends on the characteristic diagrams of the auxiliary units in which the power is plotted against the drive speed and can be assumed, for example, to be four.

Wird z.B. bei einem Kaltstart der Grenzwert GT unterschritten, überlagert das Taktsignal TS das Taktsignal TN und der Erregerstrom IE regelt bedarfsabhängig unmittelbar das Antriebsmoment ML und mittelbar über das Planetengetriebe 3 die Drehzahl NW der Wasserpumpe 11.E.g. in the event of a cold start below the limit value GT, the clock signal TS overlaps the clock signal TN and the excitation current IE directly regulates the drive torque ML as required and indirectly via the planetary gear 3 the speed NW of the water pump 11.

Eine Änderung der Lichtmaschinendrehzahl LM um z.B. 1000 l/min hat aufgrund des Übersetzungsverhältnisses des Umschlingungsbetriebes 6 von 1:2,5 eine Änderung der Drehzahl des Hohlrades 4 von 400 1/min zur Folge. Entsprechend dem Momentverhältnis ML/MW von vier ändert sich demnach die Wasserpumpendrehzahl NW um 1600 l/min.A change in the alternator speed LM by e.g. 1000 l / min results in a change in the speed of the ring gear 4 of 400 1 / min due to the transmission ratio of the belt operation 6 of 1: 2.5. Corresponding to the torque ratio ML / MW of four, the water pump speed NW changes by 1600 l / min.

Zur Erzielung einer besonders schnellen Brennkraftmaschinenerwärmung kann bei Unterschreiten des Grenzwertes GT um einen bestimmten Betrag die Wasserpumpe 11 mittels der Kupplung 15 festgebremst werden. Die Drehzahl NL erhöht sich und zum Konstanthalten der Bordspannung UB wird der Erregerstrom IE weiter abgesenkt. Bei einer regelbar ausgelegten Kupplung 15 kann die Kühlleistung zusätzlich im Bereich von Null bis ca. 0,3 der Vollastkühlleistung geregelt werden.To achieve particularly rapid heating of the internal combustion engine, the value can be reduced by a certain amount if the limit value GT is undershot Water pump 11 are braked by means of the clutch 15. The speed NL increases and the excitation current IE is further reduced to keep the on-board voltage UB constant. In the case of a controllable clutch 15, the cooling capacity can additionally be regulated in the range from zero to approximately 0.3 of the full-load cooling capacity.

Das Lastsignal SL, welches z.B. direkt von der Drosselklappenstellung an der Brennkraftmaschine abhängt, hat nur Einfluß auf den Regler 22, solange ST unterhalb des Grenzwertes GT liegt.The load signal SL, which e.g. Depends directly on the throttle valve position on the internal combustion engine, only has an influence on the controller 22 as long as ST is below the limit value GT.

In Abwandlung der zuvor beschriebenen Ausführungsform kann die Kurbelwelle 1 z.B. mit dem Sonnenrad 8 und die Wasserpumpe 11 mit dem Planetenträger 2 verbunden sein. Ebenso kann ein zweites Übersetzungsgetriebe zwischen der Kurbelwelle 1 und dem Ausgleichsgetriebe angeordnet sein. Desweiteren können zusätzliche Nebenaggregate, wie z.B. eine beim Kaltstart erforderliche Secundärluftpumpe in dem Nebenaggregatantrieb verbaut sein.In a modification of the previously described embodiment, the crankshaft 1 can e.g. be connected to the sun gear 8 and the water pump 11 to the planet carrier 2. Likewise, a second transmission gear can be arranged between the crankshaft 1 and the differential gear. Furthermore, additional auxiliary units, such as a secondary air pump required during a cold start can be installed in the auxiliary drive.

Claims (8)

  1. A method of operating an auxiliary-unit drive mounted on an internal-combustion engine in a motor vehicle, having a three-phase generator (7), the excitation current (IE) of which is switched on and off by a regulator (22) in a clock-timed manner as a function of the generator speed (NL) in such a way that an on-board voltage (UB) induced in the three-phase generator (7) remains almost constant, wherein a signal (SL, ST) dependent upon the load and/or the cooling-water temperature is additionally delivered from the internal-combustion engine to the regulator (22), and in this way a driving moment (ML) supplied to the three-phase generator (7) is controlled in a varying manner by way of the clock timing of the regulator (22), characterized in that - in order to maintain the on-board voltage (UB) while driving at least one further auxiliary unit (11) by way of a differential gearing (3) arranged between the internal-combustion engine, the three-phase generator and the at least one further auxiliary unit (11) - the generator speed (NL) and consequently the driving speed (NW) of the at least one further auxiliary unit (11) are varied in inverse proportion to each other by the differential gearing (3).
  2. A method according to Claim 1, characterized in that the signal (SL) dependent upon the load and/or the signal (ST) dependent upon the cooling-water temperature is delivered to the regulator (22) only if a lower threshold value (GT) of the signal (ST) is not reached.
  3. A method according to Claim 2, characterized in that, if the lower threshold value (GT) is not reached, the regulator (22) clock-times the excitation current (IE) downwards so that the driving moment (ML) becomes less, and the driving speed (NL) of the three-phase generator (7) is increased in order to maintain the on-board voltage (UB).
  4. A method according to Claim 1, characterized in that a control appliance (20) picks up at least the rotational speed (n) of the internal-combustion engine, the rotational speed (NL) of the three-phase generator (7), the load signal (SL) and the temperature signal (ST), and a clock-time signal (TN) as a function of the rotational speed (NL) and a clock-time signal (TS) as a function of the signals (SL and ST) are delivered to the regulator (22).
  5. A method according to Claim 4, characterized in that, when the lower threshold value (GT) is not reached by a specified amount, a coupling (15) arranged between the differential gearing (3) and the further auxiliary unit (11) is actuated by the control appliance (20) by way of a line (21).
  6. A device for performing the method according to one of Claims 1 to 5, having a differential gearing (3) arranged between the internal-combustion engine, a three-phase generator (7) and at least one further auxiliary unit, wherein the excitation current (IE) of the three-phase generator is clock-timed by a regulator (22), characterized in that the three-phase generator (7) is connected to a hollow wheel (4) of a first take-off drive (5), the further auxiliary unit (11) is connected to a sun wheel (8) of a second take-off drive (9) and the crankshaft (1) of the internal-combustion engine is connected to a planet-wheel carrier (2) of the differential gearing (3) constructed as a planetary gearing.
  7. A device according to Claim 6, characterized in that a first belt drive (6) is arranged between the hollow wheel (4) and the three-phase generator (7), a second belt drive (10) is arranged between the sun wheel (8) and the further auxiliary unit (11).
  8. A device according to Claim 6, characterized in that a locking device (15) connected to a control appliance (20) is arranged between the second take-off drive (9) and the further auxiliary unit (11).
EP92924692A 1992-01-16 1992-12-08 Method and device for operating the drive to internal-combustion engine auxiliaries Expired - Lifetime EP0576639B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4200918A DE4200918C1 (en) 1992-01-16 1992-01-16
DE4200918 1992-01-16
PCT/EP1992/002837 WO1993014560A1 (en) 1992-01-16 1992-12-08 Method and device for operating the drive to internal-combustion engine auxiliaries

Publications (2)

Publication Number Publication Date
EP0576639A1 EP0576639A1 (en) 1994-01-05
EP0576639B1 true EP0576639B1 (en) 1996-03-20

Family

ID=6449582

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92924692A Expired - Lifetime EP0576639B1 (en) 1992-01-16 1992-12-08 Method and device for operating the drive to internal-combustion engine auxiliaries

Country Status (5)

Country Link
US (1) US5429082A (en)
EP (1) EP0576639B1 (en)
JP (1) JPH06506582A (en)
DE (2) DE4200918C1 (en)
WO (1) WO1993014560A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2752016B1 (en) * 1996-07-31 1998-09-11 Renault COOLING DEVICE OF AN INTERNAL COMBUSTION ENGINE
JP4000863B2 (en) * 2002-02-15 2007-10-31 株式会社デンソー Vehicle power generation system
US8475317B2 (en) 2011-08-03 2013-07-02 Ford Global Technologies, Llc Vehicle accessory drive system
US20150083069A1 (en) * 2013-09-26 2015-03-26 Steven H. Horn Chain drive assembly
DE102015005344A1 (en) 2015-04-28 2016-11-03 Volkswagen Aktiengesellschaft Accessory drive device
DE102016201229A1 (en) 2016-01-28 2017-08-03 Schaeffler Technologies AG & Co. KG Drive arrangement and method for operating the drive arrangement

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2213303C2 (en) * 1972-03-18 1985-12-12 Daimler-Benz Ag, 7000 Stuttgart Auxiliary device drive derived from the internal combustion engine for auxiliary units such as cooling air fan, cooling water pump, servo pressure pump and the like.
DE2732279A1 (en) * 1977-07-16 1979-02-01 Daimler Benz Ag ADJUSTABLE DRIVE FOR THE AUXILIARY UNITS OF COMBUSTION MACHINES, IN PARTICULAR OF MOTOR VEHICLE COMBUSTION MACHINES
DE2801812A1 (en) * 1978-01-17 1979-07-19 Daimler Benz Ag DRIVE DEVICE FOR AUXILIARY UNITS OF COMBUSTION MACHINERY, IN PARTICULAR MOTOR VEHICLE DRIVE MACHINES
FR2485293A1 (en) * 1980-06-19 1981-12-24 Sev Marchal METHOD FOR CONTROLLING AN ALTERNATOR DRIVE CLUTCH, IN PARTICULAR FOR MOTOR VEHICLES, AND DEVICE FOR CARRYING OUT SAID METHOD
JPS601328A (en) * 1983-06-16 1985-01-07 Diesel Kiki Co Ltd Engine auxiliary machine drive controller
DE3729772A1 (en) * 1987-09-05 1989-03-16 Bosch Gmbh Robert GENERATOR SYSTEM

Also Published As

Publication number Publication date
JPH06506582A (en) 1994-07-21
WO1993014560A1 (en) 1993-07-22
US5429082A (en) 1995-07-04
EP0576639A1 (en) 1994-01-05
DE4200918C1 (en) 1993-03-11
DE59205774D1 (en) 1996-04-25

Similar Documents

Publication Publication Date Title
DE102007001944B4 (en) Auxiliary drive system and method for a hybrid vehicle having an electrically variable transmission
DE102007011798A1 (en) Accessory drive system and method for a belt-alternator-starter-electric hybrid vehicle
DE102007011799A1 (en) An accessory drive system and method for a parallel electric hybrid vehicle
EP1355051A2 (en) Energy recovery system
DE19633194A1 (en) Serial hybrid drive, especially for a motor vehicle
DE102005035403A1 (en) Drive train with a system for separating the drive and for driving ancillaries for an electrically variable transmission
DE102006027865A1 (en) Tubocharged-internal combustion engine e.g. drive motor, for use in e.g. passenger car, has additional device with external compressor driven by engine, and pressure reservoir is connected with external compressor over pressure pipe
DE10236010A1 (en) Control device and method for a vehicle which is equipped with an internal combustion engine
DE4109379A1 (en) Vehicle hybrid drive operating control - maintains constant RPM of IC engine at optimum fuel economy and exhaust emission point
EP0576639B1 (en) Method and device for operating the drive to internal-combustion engine auxiliaries
DE4333907C2 (en) Stepless auxiliary drive for motor vehicles
WO1998006940A1 (en) Process for operating a valve-controlled internal combustion engine coupled without a clutch to a starter-generator and internal combustion engine for carrying out this process
DE3134024A1 (en) GAS TURBINE SYSTEM FOR MOTOR VEHICLE OPERATION
EP0082932A2 (en) Traction unit for automotive vehicles with an electric motor and a thermal motor
EP1991453A1 (en) Method for operating a hybrid vehicle, and control unit for carrying out the method
DE102005024411A1 (en) Drive for vehicle comprises control unit connected to engine, electric motor, generator, electrical energy storage unit and clutch
EP0984871B1 (en) Drive system for an automobile and method for operating the same
DE10345414A1 (en) Belt drive driven by an internal combustion engine of a motor vehicle
EP0693392A1 (en) Agricultural tractor with electromechanical transmission
DE4137535A1 (en) Combined compressor and electrical generator - is driven by vehicle engine or by own IC engine dependent on energy requirement
DE69918906T2 (en) Device and method for generating electrical power in vehicles
DE10351935A1 (en) Engine starting device and method for regulating or controlling the same
DE3312567C2 (en)
EP1000789A2 (en) Drive for motor vehicle
DE19619469C1 (en) Fuel pump drive esp. for common rail fuel injection system for IC engine

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19930424

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB IT SE

17Q First examination report despatched

Effective date: 19950508

ITF It: translation for a ep patent filed

Owner name: DE DOMINICIS & MAYER S.R.L.

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT SE

REF Corresponds to:

Ref document number: 59205774

Country of ref document: DE

Date of ref document: 19960425

ET Fr: translation filed
GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19960403

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19961217

Year of fee payment: 5

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19971209

EUG Se: european patent has lapsed

Ref document number: 92924692.4

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19981211

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19981223

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19981229

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19991208

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19991208

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20000831

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20001003

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20051208