EP1394415A2 - Capacity controlled compressor for commercial vehicles - Google Patents

Capacity controlled compressor for commercial vehicles Download PDF

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Publication number
EP1394415A2
EP1394415A2 EP03018780A EP03018780A EP1394415A2 EP 1394415 A2 EP1394415 A2 EP 1394415A2 EP 03018780 A EP03018780 A EP 03018780A EP 03018780 A EP03018780 A EP 03018780A EP 1394415 A2 EP1394415 A2 EP 1394415A2
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EP
European Patent Office
Prior art keywords
unit
compressed air
control unit
gear
speed
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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.)
Granted
Application number
EP03018780A
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German (de)
French (fr)
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EP1394415B1 (en
EP1394415A3 (en
Inventor
Wolfgang Dörr
Eduard Gerum
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Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH
Knorr Bremse Systeme fuer Schienenfahrzeuge GmbH
Original Assignee
Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH
Knorr Bremse Systeme fuer Schienenfahrzeuge GmbH
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Publication of EP1394415A3 publication Critical patent/EP1394415A3/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/021—Units comprising pumps and their driving means containing a coupling
    • F04D13/022—Units comprising pumps and their driving means containing a coupling a coupling allowing slip, e.g. torque converter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2201/00—Pump parameters
    • F04B2201/12—Parameters of driving or driven means
    • F04B2201/1201—Rotational speed of the axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2205/00—Fluid parameters
    • F04B2205/05—Pressure after the pump outlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2205/00—Fluid parameters
    • F04B2205/06—Pressure in a (hydraulic) circuit
    • F04B2205/063—Pressure in a (hydraulic) circuit in a reservoir linked to the pump outlet

Definitions

  • the present invention relates to an air demand-controlled compressor arrangement, especially for commercial vehicles, with a motor unit for generating a rotary movement, the one via an intermediate speed-converting gear unit Compressor unit for generating compressed air from the ambient air drives, wherein a control unit triggers the generation of compressed air when the compressed air requirement is determined.
  • Compressor arrangements of the type of interest here are predominantly in Commercial vehicles installed to provide compressed air for the on-board compressed air system perform.
  • the compressed air system on board a commercial vehicle is used in particular for Supply of the brake system, air suspension, trailer and auxiliary consumers required.
  • compressed air of up to 12.5 bar is generated by the compressor arrangement.
  • the compressor unit is usually driven by the internal combustion engine of the commercial vehicle generated rotary motion. In most applications is between the internal combustion engine as a motor unit and the compressor unit interposed a speed-converting gear unit.
  • the gear unit is designed as a spur gear with a fixed gear ratio, which the speed supplied by the motor unit on the input side is rapidly translated to the To drive the compressor unit.
  • a control is provided in this known compressor arrangement, which ensures that the compressor unit is only put into operation if there is a compressed air requirement in the compressed air system of the commercial vehicle.
  • the Compressed air requirement is in most cases over one with the system pressure in Connected pressure sensor determined. If the system pressure drops below one predetermined threshold pressure, the compressor unit is started to build up sufficient air pressure again. To save the built Additional pressure vessels are mostly used in the compressed air system.
  • the compressor unit is between a delivery phase and an idling phase switchable.
  • the delivery phase compressed air is generated from the ambient air and into the Compressed air system fed.
  • the compressor unit runs in the idling phase without load, so that a piston movement is carried out, but no compressed air in the compressed air system arrives. This is discharged to the outside. Because in the idle phase much less power compared to the funding phase due to the loss of load is absorbed by the compressor unit carries this type of air demand control to save energy.
  • Air demand control is also known in the general state of the art. which is an actuatable clutch between the motor unit and Compressor unit operated, which brings the compressor unit to a standstill when there is no compressed air requirement.
  • Compressor unit is quite high compared to continuous idling Wear caused by lack of lubrication when cold started.
  • Farther is also subject to the actuatable disconnect clutch required for this air demand control wear, so that in this alternative known solution overall a right there is a high level of maintenance.
  • Another disadvantage is that due to the complete power flow separation through the disconnect clutch no possibility of drive of various additional units - such as steering aid or hydraulic pump.
  • the invention includes the technical teaching that within the scope of a Compressor arrangement used gear unit in the manner of a gear is formed with variable speed, and that the control unit with the Gear unit interacts to match the speed of the gear unit Adjust compressed air requirements.
  • the advantage of the solution according to the invention is in particular that compared to the previously known measures to save energy the high proportion of energy consumption this is significantly reduced in the predominant idling operation of the compressor unit, that the speed of the compressor unit is reduced in this case.
  • the hereby Achieved adaptation of the compressor performance to the pressure requirement is based on one analog variation of the speed of the compressor, so that a direct dependence of the Speed of the compressor from the speed of the engine and one usually there is no need for an intermediate gear with a fixed gear ratio.
  • the inventive solution an influence of the control unit on the Compressor unit upstream transmission and not directly on the compressor unit to effect the energy saving. Because the air demand control here doesn't just have one Switching the compressor unit on and off works, the wear remains within the Compressor arrangement small.
  • various additional units - such as steering aid or hydraulic pump - permanent to drive at the minimum speed required for this.
  • variable-speed gear unit can be a switchable via the control unit Gearbox be formed. Tests have shown that this is a 2-stage Gearbox is completely sufficient.
  • the variable-speed gear unit can However, it can also be designed as an adjustable, continuously variable transmission, the Control also takes place via the control unit. A continuously variable transmission comes without elaborate automatic actuators and delivers that for Required application range of the gear ratio.
  • the control of the gear unit for varying the speed can, for example, via a pneumatic signal generated by the control unit. It is also next to it possible to control via an electrical signal. The latter should the electrical signal for controlling the gear unit advantageously from a parent vehicle control are generated, in which the control unit for the Gear unit is integrated.
  • the compressed air requirement is preferably determined by means of an actual pressure electrical pressure sensor determined, which in connection with the pressure sensor standing control unit exactly then a compressed air requirement to control the Gear unit signals when the ACTUAL pressure is below a predefined TARGET pressure decreases.
  • an electrical pressure sensor it is also conceivable to use one mechanical pressure sensor to be used, for example, via a spring-loaded diaphragm plunger arrangement or the like the actual pressure in Compressed air system detected.
  • FIG. 1 shows a schematic block diagram of a Air demand controlled compressor arrangement for a commercial vehicle.
  • the generated Rotational movement is fed to a downstream gear unit 2 and reduced.
  • a compressor unit 3 On the output side of the gear unit 2, a compressor unit 3 is arranged, which the Rotary movement to generate compressed air from the ambient air in a conventional manner Way uses.
  • the compressed air generated by the compressor unit 3 is on the output side a compressed air line 4 a - not shown here - compressed air system of Commercial vehicle provided.
  • the compressor arrangement also includes means for air demand control about influencing the speed of the variable-speed gear unit 2, which here is designed as an adjustable continuously variable transmission.
  • an electronic control unit 5 is provided to control the speed-variable transmission unit 2.
  • the electronic control unit 5 is part of the electronic vehicle control 6 of the commercial vehicle.
  • the compressed air requirement of the compressed air system of the commercial vehicle is determined by means of an electrical pressure sensor 7 determining the actual pressure and as Signal via an electrical signal line 8 on the input side of the control unit 5 Provided.
  • the control unit 5 compares the actual pressure with a stored, predefined TARGET pressure, which defines a pressure limit of the printing system, which must not be undercut. When this limit occurs, the Control unit 5 of the variable-speed gear unit 2 via an electrical signal line 9 a command to increase the gear ratio so that the output side Speed for driving the compressor unit 3 increases under load by the Pressure sensor 7 signaled to meet compressed air requirements.
  • variable-speed gear unit 2 When reaching an upper Pressure threshold value in the pressure system becomes the variable-speed gear unit 2 by means of a corresponding command signals that the gear ratio is has to change again in such a way that on the output side the variable speed Gear unit 2 has a low speed for driving the compressor unit 3 Is made available and the compressor unit 3 is idling.
  • the air demand control according to the invention requires only a minimum of maintenance of the mechanical components of the compressor assembly and is characterized by a Energy saving effect with high efficiency.
  • the invention is not restricted to the exemplary embodiment specified above but also includes modifications thereof which fall within the scope of the claims are included.
  • the invention is not limited to electronic pressure sensor technology limited. Pneumatic-mechanical detection of the system pressure is also conceivable and forwarding it to a suitable control unit.
  • the Variable-speed gear unit also pneumatically operated via a compressed air line be, with the pneumatic signal also the force for actuation the variable-speed gear unit is transferable.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Control Of Positive-Displacement Air Blowers (AREA)

Abstract

The device has a motor (1) to generate a rotary movement, transmitted via a transmission (2) to a compressor (3) to generate compressed air from ambient air. Air generated is initiated on a demand by a control unit (5). The transmission has variable RPM, and acts with the control unit to adapt the transmission RPM to the compressed air demand. Demand is determined by a mechanical or electric pressure sensor (7) to measure the actual pressure. The sensor is connected to the control unit, which signals a compressed air demand for control of the transmission, when the actual pressure falls below a pre-defined reference pressure.

Description

Die vorliegende Erfindung betrifft eine luftbedarfsgesteuerte Kompressoranordnung, insbesondere für Nutzfahrzeuge, mit einer Motoreinheit zur Erzeugung einer Drehbewegung, die über eine zwischengeschaltete drehzahlübersetzende Getriebeeinheit eine Verdichtereinheit zur Erzeugung von Druckluft aus der Umgebungsluft antreibt, wobei eine Steuereinheit die Drucklufterzeugung bei einem ermittelten Druckluftbedarf auslöst.The present invention relates to an air demand-controlled compressor arrangement, especially for commercial vehicles, with a motor unit for generating a rotary movement, the one via an intermediate speed-converting gear unit Compressor unit for generating compressed air from the ambient air drives, wherein a control unit triggers the generation of compressed air when the compressed air requirement is determined.

Kompressoranordnungen der hier interessierenden Art werden überwiegend in Nutzfahrzeugen verbaut, um die Druckluftbeschaffung des bordeigenen Druckluftsystems auszuführen. Das Druckluftsystem an Bord eines Nutzfahrzeuges wird insbesondere zur Versorgung der Bremsanlage, Luftfederung, Anhänger und Nebenverbraucher benötigt. Von der Kompressoranordnung wird hierfür Druckluft von bis zu 12,5 bar erzeugt.Compressor arrangements of the type of interest here are predominantly in Commercial vehicles installed to provide compressed air for the on-board compressed air system perform. The compressed air system on board a commercial vehicle is used in particular for Supply of the brake system, air suspension, trailer and auxiliary consumers required. For this purpose, compressed air of up to 12.5 bar is generated by the compressor arrangement.

Aus der Produktinformation "Hochleistungs-Kompressoren" der Firma KNORR-BREMSE Systeme für Nutzfahrzeuge GmbH (Druck-Nr. P-3505-DE-01) geht eine Verdichtereinheit hervor, die nach Art eines Kolbenverdichters ausgebildet ist. Eine in einem Verdichtergehäuse drehend gelagerte Kurbelwelle setzt eine eingangsseitige Drehbewegung mittels eines Kurbeltriebs in eine lineare Bewegung eines zugeordneten, in einem Zylinder untergebrachten Kolbens um, der im Zusammenwirken mit einer Ventileinrichtung Umgebungsluft ansaugt und diese anschließend verdichtet. Die Verdichtereinheit kann- je nach gewünschter Förderleistung - ein oder mehrzylindrig ausgeführt werden.From the product information "High-performance compressors" from KNORR-BREMSE Systeme für Nutzfahrzeuge GmbH (print no. P-3505-DE-01) is a compressor unit out, which is designed in the manner of a piston compressor. One in one Compressor housing rotatably mounted crankshaft sets an input side Rotary movement by means of a crank mechanism in a linear movement of an associated, in a cylinder housed piston in cooperation with a Valve device sucks in ambient air and then compresses it. The Depending on the desired delivery rate, the compressor unit can have one or more cylinders be carried out.

Der Antrieb der Verdichtereinheit erfolgt gewöhnlich über die von der Verbrennungskraftmaschine des Nutzfahrzeuges erzeugten Drehbewegung. In den meisten Anwendungsfällen ist zwischen der Verbrennungskraftmaschine als Motoreinheit und der Verdichtereinheit eine drehzahlübersetzende Getriebeeinheit zwischengeschaltet. Die Getriebeeinheit ist dabei als Stirnradgetriebe mit einem festen Übersetzungsverhältnis ausgebildet, welches die von der Motoreinheit eingangsseitig zugeführte Drehzahl ins Schnelle übersetzt, um die Verdichtereinheit anzutreiben.The compressor unit is usually driven by the internal combustion engine of the commercial vehicle generated rotary motion. In most applications is between the internal combustion engine as a motor unit and the compressor unit interposed a speed-converting gear unit. The gear unit is designed as a spur gear with a fixed gear ratio, which the speed supplied by the motor unit on the input side is rapidly translated to the To drive the compressor unit.

Weiterhin ist bei dieser bekannten Kompressoranordnung eine Steuerung vorgesehen, welche gewährleistet, dass die Verdichtereinheit nur dann in Betrieb genommen wird, wenn ein Druckluftbedarf im Druckluftsystem des Nutzfahrzeuges besteht. Der Druckluftbedarf wird in den meisten Fällen über einen mit dem Systemdruck in Verbindung stehenden Drucksensor ermittelt. Sinkt der Systemdruck unter einen vorgegebenen Schwellendruck, so wird die Verdichtereinheit in Betrieb genommen, um wieder einen ausreichenden Luftdruck aufzubauen. Zur Speicherung des aufgebauten Drucks werden im Druckluftsystem meist zusätzliche Druckbehälter eingesetzt.Furthermore, a control is provided in this known compressor arrangement, which ensures that the compressor unit is only put into operation if there is a compressed air requirement in the compressed air system of the commercial vehicle. The Compressed air requirement is in most cases over one with the system pressure in Connected pressure sensor determined. If the system pressure drops below one predetermined threshold pressure, the compressor unit is started to build up sufficient air pressure again. To save the built Additional pressure vessels are mostly used in the compressed air system.

Um eine solche Bedarfssteuerung für die Inbetriebnahme der Verdichtereinheit zu realisieren, ist die Verdichtereinheit zwischen einer Förderphase und einer Leerlaufphase umschaltbar. In der Förderphase wird Druckluft aus der Umgebungsluft erzeugt und in das Druckluftsystem gespeist. Dem gegenüber läuft die Verdichtereinheit in der Leerlaufphase ohne Last, so dass zwar eine Kolbenbewegung ausgeführt wird, jedoch keine Druckluft in das Druckluftsystem gelangt. Diese wird nach außen abgeführt. Da in der Leerlaufphase aufgrund der wegfallenden Last gegenüber der Förderphase sehr viel weniger Leistung durch die Verdichtereinheit aufgenommen wird, trägt diese Art von Luftbedarfssteuerung zur Energieeinsparung bei.To such a demand control for the commissioning of the compressor unit too the compressor unit is between a delivery phase and an idling phase switchable. In the delivery phase, compressed air is generated from the ambient air and into the Compressed air system fed. In contrast, the compressor unit runs in the idling phase without load, so that a piston movement is carried out, but no compressed air in the compressed air system arrives. This is discharged to the outside. Because in the idle phase much less power compared to the funding phase due to the loss of load is absorbed by the compressor unit carries this type of air demand control to save energy.

Langzeituntersuchungen haben jedoch gezeigt, dass die luftbedarfsgesteuerte Kompressoranordnung oft mit sehr geringen Einschaltdauern von 5 - 10% in der Förderphase betrieben wird, was durch den überwiegenden Fernverkehrsbetrieb auf der Autobahn zurückzuführen ist. Bei dieser kleinen Einschaltdauer gewinnt die dem gegenüber hohe Einschaltdauer von ca. 90% der Leerlaufphase stark an Gewicht, so dass wegen der immer noch beträchtlichen Leistungsaufnahme in der Leerlaufphase der Energieverbrauch im Leerlaufbetrieb insgesamt größer ist als im Lastbetrieb. Dieses Ergebnis wird auch dadurch verstärkt, dass die Verdichtereinheit für den Normalbetrieb oft überdimensioniert ist, um innerhalb kürzester Zeit einen hohen Druck im Druckluftsystem zu erzeugen. Dies ist insbesondere beim Befüllen des Druckluftsystems bei leeren Druckbehältern, der Betätigung von Liftachsen, etc. der Fall. Insgesamt führt die bekannte Luftbedarfssteuerung zur Energieeinsparung also noch zu recht unbefriedigenden Ergebnissen.Long-term studies have shown, however, that the air demand controlled Compressor arrangement often with very short duty cycles of 5 - 10% in the Funding phase is operated, which is due to the predominant long-distance traffic on the Autobahn is due. With this small duty cycle, the wins compared to the high duty cycle of approx. 90% of the idle phase, the weight is so high that because of the still considerable power consumption in the idle phase of the Overall, energy consumption in idle mode is greater than in load mode. This The result is also reinforced by the fact that the compressor unit is often used for normal operation is oversized to a high pressure in the compressed air system within a very short time to create. This is particularly the case when filling the compressed air system with empty ones Pressure tanks, the actuation of lift axles, etc. the case. Overall, the well-known Air demand control to save energy is still quite unsatisfactory Results.

Im allgemeinen Stand der Technik ist weiterhin auch eine Luftbedarfssteuerung bekannt, die sich einer betätigbaren Trennkupplung zwischen der Motoreinheit und der Verdichtereinheit bedient, womit die Verdichtereinheit zum Stillstand gebracht wird, wenn ein Druckluftbedarf nicht besteht. Allerdings unterliegt eine derartig betriebene Verdichtereinheit im Vergleich zu einem dauernden Leerlauf einem recht hohen Verschleiß, begründet durch mangelnde Schmierwirkung beim Kaltstart. Weiterhin unterliegt auch die für diese Luftbedarfssteuerung erforderliche betätigbare Trennkupplung einem Verschleiß, so dass bei dieser alternativen bekannten Lösung insgesamt ein recht hoher Wartungsaufwand besteht. Ein weiterer Nachteil besteht darin, dass aufgrund der vollständigen Kraftflusstrennung durch die Trennkupplung keine Möglichkeit zum Antrieb von diversen Zusatzaggregaten - wie Lenkhilfe oder Hydraulikpumpe - besteht.Air demand control is also known in the general state of the art. which is an actuatable clutch between the motor unit and Compressor unit operated, which brings the compressor unit to a standstill when there is no compressed air requirement. However, one operated in this way is subject to Compressor unit is quite high compared to continuous idling Wear caused by lack of lubrication when cold started. Farther is also subject to the actuatable disconnect clutch required for this air demand control wear, so that in this alternative known solution overall a right there is a high level of maintenance. Another disadvantage is that due to the complete power flow separation through the disconnect clutch no possibility of drive of various additional units - such as steering aid or hydraulic pump.

Es ist daher die Aufgabe der vorliegenden Erfindung eine luftbedarfsgesteuerte Kompressoranordnung der eingangs beschriebenen Art dahingehend weiter zu verbessern, dass eine effektivere Energieeinsparung der Kompressoranordnung bei gleichzeitig minimalem Wartungsaufwand gewährleistet wird.It is therefore the object of the present invention to control the demand for air To further improve the compressor arrangement of the type described in the introduction, that more effective energy saving the compressor assembly at the same time minimal maintenance is guaranteed.

Die Aufgabe wird ausgehend von einer luftbedarfsgesteuerten Kompressoranordnung gemäß dem Oberbegriff des Anspruchs 1 in Verbindung mit dessen kennzeichnenden Merkmalen gelöst. Die nachfolgenden abhängigen Ansprüche geben vorteilhafte Weiterbildungen der Erfindung wieder.The task is based on an air demand-controlled compressor arrangement according to the preamble of claim 1 in conjunction with its characterizing Features resolved. The following dependent claims are advantageous Developments of the invention again.

Die Erfindung schließt die technische Lehre ein, dass die im Rahmen einer Kompressoranordnung zum Einsatz kommende Getriebeeinheit nach Art eines Getriebes mit variierbarer Drehzahl ausgebildet ist, und dass die Steuereinheit mit der Getriebeeinheit zusammenwirkt, um die Drehzahl der Getriebeeinheit entsprechend des Druckluftbedarfs anzupassen.The invention includes the technical teaching that within the scope of a Compressor arrangement used gear unit in the manner of a gear is formed with variable speed, and that the control unit with the Gear unit interacts to match the speed of the gear unit Adjust compressed air requirements.

Der Vorteil der erfindungsgemäßen Lösung liegt insbesondere darin, dass gegenüber der vorbekannten Maßnahmen zur Energieeinsparung der hohe Anteil des Energieverbrauchs im überwiegenden Leerlaufbetrieb der Verdichtereinheit dadurch erheblich reduziert wird, dass die Drehzahl der Verdichtereinheit in diesem Falle herabgesetzt wird. Die hierdurch erzielte Anpassung der Verdichterleistung an den Druckbedarf basiert also auf eine analoge Variation der Drehzahl des Verdichters, so dass eine direkte Abhängigkeit der Drehzahl des Verdichters von der Drehzahl des Motors und einem gewöhnlich zwischengeschalteten Getriebe mit fester Übersetzung entfällt. Weiterhin erfolgt bei der erfindungsgemäßen Lösung eine Einflussnahme der Steuereinheit auf das der Verdichtereinheit vorgeschaltete Getriebe und nicht direkt auf die Verdichtereinheit, um die Energieeinsparung zu bewirken. Da die Luftbedarfssteuerung hier nicht über ein nur Ein- und Ausschalten der Verdichtereinheit arbeitet, bleibt der Verschleiß innerhalb der Kompressoranordnung gering. Desweiteren ist es durch die erfindungsgemäße Lösung auch möglich, diverse Zusatzaggregate - wie Lenkhilfe oder Hydraulikpumpe - permanent mit der hierfür minimal erforderlichen Drehzahl anzutreiben.The advantage of the solution according to the invention is in particular that compared to the previously known measures to save energy the high proportion of energy consumption this is significantly reduced in the predominant idling operation of the compressor unit, that the speed of the compressor unit is reduced in this case. The hereby Achieved adaptation of the compressor performance to the pressure requirement is based on one analog variation of the speed of the compressor, so that a direct dependence of the Speed of the compressor from the speed of the engine and one usually there is no need for an intermediate gear with a fixed gear ratio. Furthermore, the inventive solution an influence of the control unit on the Compressor unit upstream transmission and not directly on the compressor unit to effect the energy saving. Because the air demand control here doesn't just have one Switching the compressor unit on and off works, the wear remains within the Compressor arrangement small. Furthermore, it is through the solution according to the invention also possible, various additional units - such as steering aid or hydraulic pump - permanent to drive at the minimum speed required for this.

Die drehzahlvariierbare Getriebeeinheit kann als ein über die Steuereinheit schaltbares Ganggetriebe ausgebildet sein. Versuche haben ergeben, dass hierfür ein 2-stufiges Ganggetriebe völlig ausreichend ist. Die drehzahlvariierbare Getriebeeinheit kann allerdings auch als ein einstellbares, stufenloses Getriebe ausgebildet sein, dessen Ansteuerung ebenfalls über die Steuereinheit erfolgt. Ein stufenloses Getriebe kommt ohne aufwendige automatische Betätigungseinrichtungen aus und liefert das für den vorliegenden Anwendungsfall erforderliche Spektrum des Übersetzungsverhältnisses.The variable-speed gear unit can be a switchable via the control unit Gearbox be formed. Tests have shown that this is a 2-stage Gearbox is completely sufficient. The variable-speed gear unit can However, it can also be designed as an adjustable, continuously variable transmission, the Control also takes place via the control unit. A continuously variable transmission comes without elaborate automatic actuators and delivers that for Required application range of the gear ratio.

Die Ansteuerung der Getriebeeinheit zur Variierung der Drehzahl kann beispielsweise über ein von der Steuereinheit generiertes pneumatisches Signal erfolgen. Daneben ist es auch möglich, die Ansteuerung über ein elektrisches Signal vorzunehmen. Letzterenfalls sollte das elektrische Signal zur Ansteuerung der Getriebeeinheit vorteilhafterweise von einer übergeordneten Fahrzeugsteuerung erzeugt werden, in welcher die Steuereinheit für die Getriebeeinheit integriert ist.The control of the gear unit for varying the speed can, for example, via a pneumatic signal generated by the control unit. It is also next to it possible to control via an electrical signal. The latter should the electrical signal for controlling the gear unit advantageously from a parent vehicle control are generated, in which the control unit for the Gear unit is integrated.

Der Druckluftbedarf wird vorzugsweise mittels eines den IST-Druck ermittelnden elektrischen Drucksensors festgestellt, wobei die mit dem Drucksensor in Verbindung stehende Steuereinheit genau dann einen Druckluftbedarf zur Ansteuerung der Getriebeeinheit signalisiert, wenn der IST-Druck unter einen vordefinierten SOLL-Druck absinkt. Alternativ zu einem elektrischen Drucksensor ist es jedoch auch denkbar, einen mechanischen Drucksensor zum Einsatz zu bringen, der beispielsweise über eine federbelastete Membran-Stößel-Anordnung oder dergleichen den IST-Druck im Druckluftsystem detektiert.The compressed air requirement is preferably determined by means of an actual pressure electrical pressure sensor determined, which in connection with the pressure sensor standing control unit exactly then a compressed air requirement to control the Gear unit signals when the ACTUAL pressure is below a predefined TARGET pressure decreases. As an alternative to an electrical pressure sensor, however, it is also conceivable to use one mechanical pressure sensor to be used, for example, via a spring-loaded diaphragm plunger arrangement or the like the actual pressure in Compressed air system detected.

Weitere die Erfindung verbessernde Maßnahmen werden nachstehend gemeinsam mit der Beschreibung eines bevorzugten Ausführungsbeispiels der Erfindung anhand der einzigen Figur näher dargestellt. Die Figur zeigt ein schematisches Blockschaltbild einer luftbedarfsgesteuerten Kompressoranordnung für ein Nutzfahrzeug.Further measures improving the invention are described below together with the Description of a preferred embodiment of the invention based on the single Figure shown in more detail. The figure shows a schematic block diagram of a Air demand controlled compressor arrangement for a commercial vehicle.

Diese besteht im Wesentlichen aus einer Motoreinheit 1 zur Erzeugung einer Drehbewegung, hier die Verbrennungskraftmaschine des Nutzfahrzeuges. Die erzeugte Drehbewegung wird einer nachgeschalteten Getriebeeinheit 2 zugeführt und untersetzt. Abtriebsseitig der Getriebeeinheit 2 ist eine Verdichtereinheit 3 angeordnet, welche die Drehbewegung zur Erzeugung von Druckluft aus der Umgebungsluft in herkömmlicher Weise nutzt. Die von der Verdichtereinheit 3 erzeugte Druckluft wird ausgangsseitig über eine Druckluftleitung 4 einem - hier nicht weiter dargestellten - Druckluftsystem des Nutzfahrzeuges zur Verfügung gestellt.This essentially consists of a motor unit 1 for generating a Rotational movement, here the internal combustion engine of the commercial vehicle. The generated Rotational movement is fed to a downstream gear unit 2 and reduced. On the output side of the gear unit 2, a compressor unit 3 is arranged, which the Rotary movement to generate compressed air from the ambient air in a conventional manner Way uses. The compressed air generated by the compressor unit 3 is on the output side a compressed air line 4 a - not shown here - compressed air system of Commercial vehicle provided.

Die Kompressoranordnung umfasst darüber hinaus auch Mittel zur Luftbedarfssteuerung über eine Beeinflussung der Drehzahl der drehzahlvariierbaren Getriebeeinheit 2, die hier als einstellbares stufenloses Getriebe ausgebildet ist. Zur Ansteuerung der drehzahlvariierbaren Getriebeeinheit 2 ist eine elektronische Steuereinheit 5 vorgesehen. The compressor arrangement also includes means for air demand control about influencing the speed of the variable-speed gear unit 2, which here is designed as an adjustable continuously variable transmission. To control the speed-variable transmission unit 2, an electronic control unit 5 is provided.

Die elektronische Steuereinheit 5 ist Bestandteil der elektronischen Fahrzeugsteuerung 6 des Nutzfahrzeugs. Der Druckluftbedarf des Druckluftsystems des Nutzfahrzeugs wird mittels eines den IST-Druck ermittelnden elektrischen Drucksensors 7 festgestellt und als Signal über eine elektrische Signalleitung 8 eingangsseitig der Steuereinheit 5 zur Verfügung gestellt. Die Steuereinheit 5 vergleicht den IST-Druck mit einem hinterlegten, vordefinierten SOLL-Druck, der einen Grenzdruck des Drucksystems definiert, welcher nicht unterschritten werden darf. Bei Eintritt dieses Grenzfalles signalisiert die Steuereinheit 5 der drehzahlvariablen Getriebeeinheit 2 über eine elektrische Signalleitung 9 einen Befehl zur Erhöhung des Übersetzungsverhältnisses, so dass die ausgangsseitige Drehzahl zum Antrieb der Verdichtereinheit 3 unter Last ansteigt, um den über den Drucksensor 7 signalisierten Druckluftbedarf zu decken. Bei Erreichen eines oberen Druck-Schwellenwerts im Drucksystem wird der drehzahlvariierbaren Getriebeeinheit 2 mittels eines entsprechenden Befehls signalisiert, dass das Übersetzungsverhältnis sich wieder dergestalt zu ändern hat, dass ausgangsseitig der drehzahlvariierbaren Getriebeeinheit 2 eine niedrige Drehzahl zum Antrieb der Verdichtereinheit 3 zur Verfügung gestellt wird und die Verdichtereinheit 3 in Leerlauf tritt.The electronic control unit 5 is part of the electronic vehicle control 6 of the commercial vehicle. The compressed air requirement of the compressed air system of the commercial vehicle is determined by means of an electrical pressure sensor 7 determining the actual pressure and as Signal via an electrical signal line 8 on the input side of the control unit 5 Provided. The control unit 5 compares the actual pressure with a stored, predefined TARGET pressure, which defines a pressure limit of the printing system, which must not be undercut. When this limit occurs, the Control unit 5 of the variable-speed gear unit 2 via an electrical signal line 9 a command to increase the gear ratio so that the output side Speed for driving the compressor unit 3 increases under load by the Pressure sensor 7 signaled to meet compressed air requirements. When reaching an upper Pressure threshold value in the pressure system becomes the variable-speed gear unit 2 by means of a corresponding command signals that the gear ratio is has to change again in such a way that on the output side the variable speed Gear unit 2 has a low speed for driving the compressor unit 3 Is made available and the compressor unit 3 is idling.

Die erfindungsgemäße Luftbedarfssteuerung erfordert nur ein Mindestmaß an Wartung der mechanischen Bauteile der Kompressoranordnung und zeichnet sich durch einen Energiespareffekt mit hohem Wirkungsgrad aus.The air demand control according to the invention requires only a minimum of maintenance of the mechanical components of the compressor assembly and is characterized by a Energy saving effect with high efficiency.

Die Erfindung ist nicht beschränkt auf das vorstehend angegebene Ausführungsbeispiel sondern umfasst auch Abwandlungen hiervon, welche vom Schutzbereich der Ansprüche umfasst sind. So ist die Erfindung nicht allein auf eine elektronische Drucksensorik beschränkt. Denkbar ist auch eine pneumatisch-mechanische Detektion des Systemdrucks und dessen Weiterleitung an eine geeignete Steuereinheit. Weiterhin kann die drehzahlvariierbare Getriebeeinheit auch über eine Druckluftleitung pneumatisch betätigt werden, wobei über das pneumatische Signal gleichzeitig auch die Kraft zur Betätigung der drehzahlvariierbaren Getriebeeinheit übertragbar ist. The invention is not restricted to the exemplary embodiment specified above but also includes modifications thereof which fall within the scope of the claims are included. Thus, the invention is not limited to electronic pressure sensor technology limited. Pneumatic-mechanical detection of the system pressure is also conceivable and forwarding it to a suitable control unit. Furthermore, the Variable-speed gear unit also pneumatically operated via a compressed air line be, with the pneumatic signal also the force for actuation the variable-speed gear unit is transferable.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Motoreinheitmotor unit
22
drehzahlvariierbare Getriebeeinheitvariable-speed gear unit
33
Verdichtereinheitcompressor unit
44
DruckluftleitungCompressed air line
55
Steuereinheitcontrol unit
66
Fahrzeugsteuerungvehicle control
77
Drucksensorpressure sensor
88th
elektrische Signalleitungelectrical signal line
99
elektrische Signalleitungelectrical signal line

Claims (8)

Luftbedarfsgesteuerte Kompressoranordnung, insbesondere für Nutzfahrzeuge, mit einer Motoreinheit (1) zur Erzeugung einer Drehbewegung, die über eine zwischengeschaltete drehzahlübersetzende Getriebeeinheit (2) eine Verdichtereinheit (3) zur Erzeugung von Druckluft aus der Umgebungsluft antreibt, wobei eine Steuereinheit (5) die Drucklufterzeugung bei Druckluftbedarf auslöst,
dadurch gekennzeichnet, dass die Getriebeeinheit (2) nach Art eines Getriebes mit variierbarer Drehzahl ausgebildet ist und die Steuereinheit (5) mit der Getriebeeinheit (2) zusammenwirkt, um die Drehzahl der Getriebeeinheit (2) entsprechend des Druckluftbedarfs anzupassen, wobei der Druckluftbedarf mittels eines den IST-Druck ermittelnden mechanischen oder elektrischen Drucksensor (7) feststellbar ist, wobei die mit dem Drucksensor (7) in Verbindung stehende Steuereinheit (5) genau dann einen Druckluftbedarf zur Ansteuerung der Getriebeeinheit (2) signalisiert, wenn der IST-Druck unter einen vordefinierten SOLL-Druck absinkt.Air demand-controlled compressor arrangement, in particular for commercial vehicles, with a motor unit (1) for generating a rotary movement, which drives a compressor unit (3) for generating compressed air from the ambient air via an intermediate speed-converting gear unit (2), a control unit (5) contributing to the generation of compressed air Triggers compressed air demand,
characterized in that the gear unit (2) is designed in the manner of a gear with variable speed and the control unit (5) cooperates with the gear unit (2) in order to adjust the speed of the gear unit (2) according to the compressed air requirement, the compressed air requirement using a the mechanical or electrical pressure sensor (7) which determines the actual pressure can be determined, the control unit (5) connected to the pressure sensor (7) signaling a compressed air requirement for actuating the gear unit (2) precisely when the actual pressure is below one predefined target pressure drops. Luftbedarfsgesteuerte Kompressoranordnung nach Anspruch 1,
dadurch gekennzeichnet, dass die drehzahlvariierbare Getriebeeinheit (2) als ein über die Steuereinheit (5) schaltbäres Ganggetriebe ausgebildet ist.Air demand controlled compressor arrangement according to claim 1,
characterized in that the speed-variable transmission unit (2) is designed as a gear transmission which can be shifted via the control unit (5). Luftbedarfsgesteuerte Kompressoranordnung nach Anspruch 1,
dadurch gekennzeichnet, dass die drehzahlvariierbare Getriebeeinheit (2) als ein über die Steuereinheit (5) einstellbares stufenloses Getriebe ausgebildet ist.Air demand controlled compressor arrangement according to claim 1,
characterized in that the speed-variable transmission unit (2) is designed as a continuously variable transmission which can be set via the control unit (5). Luftbedarfsgesteuerte Kompressoranordnung nach Anspruch 2 oder 3,
dadurch gekennzeichnet, dass die Ansteuerung der Getriebeeinheit (2) über ein von der Steuereinheit (5) generiertes pneumatisches Signal erfolgt.Air demand controlled compressor arrangement according to claim 2 or 3,
characterized in that the control of the gear unit (2) takes place via a pneumatic signal generated by the control unit (5). Luftbedarfsgesteuerte Kompressoranordnung nach einem der vorstehenden Ansprüche,
dadurch gekennzeichnet, dass über die Getriebeeinheit (2) neben der Verdichtereinheit (3) auch eine Lenkhilfeeinheit und/oder eine Hydraulikpumpe als Zusatzaggregate permanent antreibbar sind, wobei die Steuereinheit (5) den Drehzahl- oder Leistungsbedarf der Zusatzaggregate bei der Ansteuerung der Getriebeeinheit (2) mit berücksichtigt.Air demand-controlled compressor arrangement according to one of the preceding claims,
characterized in that, in addition to the compressor unit (3), a steering aid unit and / or a hydraulic pump can also be permanently driven as additional units via the transmission unit (2), the control unit (5) determining the speed or power requirement of the additional units when the transmission unit (2 ) also taken into account. Luftbedarfsgesteuerte Kompressoranordnung nach Anspruch 2 oder 3,
dadurch gekennzeichnet, dass die Ansteuerung der Getriebeeinheit (2) über ein von der Steuereinheit (5) generiertes elektrisches Signal erfolgt.Air demand controlled compressor arrangement according to claim 2 or 3,
characterized in that the control of the gear unit (2) takes place via an electrical signal generated by the control unit (5). Luftbedarfsgesteuerte Kompressoranordnung nach Anspruch 5,
dadurch gekennzeichnet, dass das elektrische Signal zur Ansteuerung der Getriebeeinheit (2) von der in eine Fahrzeugsteuerung (6) integrierte Steuereinheit (5) erzeugbar ist.Air demand controlled compressor arrangement according to claim 5,
characterized in that the electrical signal for controlling the gear unit (2) can be generated by the control unit (5) integrated in a vehicle control (6). Luftbeschaffüngsanlage eines Nutzfahrzeuges,
gekennzeichnet durch eine luftbedarfsgesteuerte Kompressoranordnung nach einem der vorstehenden Ansprüche.Air procurement system of a commercial vehicle,
characterized by an air demand-controlled compressor arrangement according to one of the preceding claims.
EP03018780.1A 2002-08-30 2003-08-28 Capacity controlled compressor for commercial vehicles Expired - Lifetime EP1394415B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10240162A DE10240162A1 (en) 2002-08-30 2002-08-30 Air demand controlled compressor arrangement, especially for commercial vehicles
DE10240162 2002-08-30

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EP1394415A3 EP1394415A3 (en) 2009-07-01
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DE102013113557A1 (en) * 2013-12-05 2015-06-11 Knorr-Bremse Systeme für Schienenfahrzeuge GmbH Compressor system for a railway vehicle and method for operating the compressor system with a safe emergency operation
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US10393104B2 (en) 2013-12-05 2019-08-27 Knorr-Bremse Systeme für Schienenfahrzeuge GmbH Compressor system and method for operating the compressor system in dependence on the current situation of the rail vehicle
DE102013113555A1 (en) * 2013-12-05 2015-06-11 Knorr-Bremse Systeme für Schienenfahrzeuge GmbH Compressor system and method for operating the compressor system depending on the operating state of the rail vehicle
CN110809702A (en) * 2017-05-10 2020-02-18 诺沃皮尼奥内技术股份有限公司 Compressor train arrangement

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EP1394415B1 (en) 2013-04-17
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US20040136840A1 (en) 2004-07-15
EP1394415A3 (en) 2009-07-01

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