EP1394415B1 - Capacity controlled compressor for commercial vehicles - Google Patents
Capacity controlled compressor for commercial vehicles Download PDFInfo
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- EP1394415B1 EP1394415B1 EP03018780.1A EP03018780A EP1394415B1 EP 1394415 B1 EP1394415 B1 EP 1394415B1 EP 03018780 A EP03018780 A EP 03018780A EP 1394415 B1 EP1394415 B1 EP 1394415B1
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- Prior art keywords
- unit
- air
- compressor
- compressed
- gearing
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- 239000003570 air Substances 0.000 claims description 57
- 230000033001 locomotion Effects 0.000 claims description 10
- 239000012080 ambient air Substances 0.000 claims description 6
- 238000002485 combustion reaction Methods 0.000 claims description 6
- 230000011664 signaling Effects 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 description 25
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000013519 translation Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
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- 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
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- 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
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- 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
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- 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
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- 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 assembly in combination with a vehicle control of a commercial vehicle, comprising a motor unit for generating a rotational movement, which drives a compressor unit for generating compressed air from the ambient air via an intermediate speed-gear unit, wherein a control unit, the compressed air generation in compressed air demand of a compressed air system Commercial vehicle triggers, wherein the transmission unit is designed in the manner of a transmission with variable speed and the control unit cooperates with the transmission unit to adjust the rotational speed of the gear unit according to the compressed air demand, the compressed air requirement by means of a IST-pressure determining mechanical or electrical pressure sensor can be fixed, wherein the control unit in communication with the pressure sensor signaled a compressed air demand for controlling the transmission unit when the Actual pressure drops below a predefined target pressure.
- Compressor arrangements of the type of interest here are mainly installed in commercial vehicles to perform the compressed air procurement of the onboard compressed air system.
- the compressed air system on board a commercial vehicle is needed in particular for the supply of the brake system, air suspension, trailer and auxiliary consumers.
- Compressed air of up to 12.5 bar is generated by the compressor arrangement.
- a compressor unit emerges which is designed in the manner of a reciprocating compressor.
- a rotating crankshaft mounted in a compressor housing sets an input side Rotary movement by means of a crank mechanism in a linear movement of an associated, housed in a cylinder piston around which sucks ambient air in cooperation with a valve device and then compressed.
- the compressor unit can be designed as one or more cylinders.
- the drive of the compressor unit usually takes place via the rotational movement generated by the internal combustion engine of the commercial vehicle.
- a speed-transmitting gear unit is interposed between the internal combustion engine as a motor unit and the compressor unit.
- the gear unit is designed as a spur gear with a fixed gear ratio, which translates the speed input from the engine unit input speed to drive the compressor unit.
- a controller is provided in this known compressor arrangement, which ensures that the compressor unit is only put into operation when a compressed air demand in the compressed air system of the commercial vehicle.
- the compressed air requirement is in most cases determined via a pressure sensor which is connected to the system pressure. If the system pressure falls below a predetermined threshold pressure, then the compressor unit is put into operation in order to build up a sufficient air pressure again. For storing the built-up pressure usually additional pressure vessels are used in the compressed air system.
- the compressor unit can be switched between a delivery phase and an idling phase.
- compressed air is generated from the ambient air and fed into the compressed air system.
- the compressor unit runs in the idle phase without load, so that although a piston movement is performed, but no compressed air enters the compressed air system. This is discharged to the outside. Because in the idle phase due to the loss of load compared to the funding phase much less power is absorbed by the compressor unit, this type of air demand control contributes to energy saving.
- an air demand control which uses an operable disconnect clutch between the engine unit and the compressor unit, whereby the compressor unit is brought to a standstill when a compressed air demand does not exist.
- a compressor unit operated in comparison to a permanent idling quite a high wear, due to lack of lubricating effect during cold start.
- this air demand control operable disconnect clutch wear so that in this alternative known solution overall, a fairly high maintenance is.
- Another disadvantage is that due to the complete power flow separation through the clutch no possibility to drive various accessories - such as power steering or hydraulic pump - exists.
- an auxiliary power system of a motor vehicle in which an auxiliary unit, for example in the form of a Compressor can be driven by an internal combustion engine via an intermediate, continuously variable transmission unit.
- an airflow provided by the compressor can be varied by appropriate regulation of a ratio of the continuously variable transmission unit.
- EP 0 106 612 an air-demand-controlled compressor assembly of a commercial vehicle, which has a motor unit in the form of an internal combustion engine for generating a rotational movement, which drives a compressor unit for generating compressed air from the ambient air via an intermediate, speed-increasing gear unit. Furthermore, a control unit is provided which triggers the compressed air generation at a corresponding requirement of a compressed air system of the commercial vehicle.
- the intermediate gear unit is designed as a planetary gear, the translation can be changed by the control unit. In this case, a setting of the translation is made by the control unit according to the compressed air requirement, wherein the compressed air requirement is determined by balancing an actual pressure with a predefined set pressure.
- the invention includes the technical teaching that the coming in the context of a compressor assembly used gear unit is designed in the manner of a transmission with variable speed, and that the control unit with the Gear unit cooperates to adjust the speed of the gear unit according to the compressed air demand.
- the advantage here is in particular that the high proportion of energy consumption in the vast idling operation of the compressor unit is significantly reduced by the speed of the compressor unit is reduced in this case.
- the thus achieved adaptation of the compressor power to the pressure demand is thus based on an analogous variation of the speed of the compressor, so that a direct dependence of the speed of the compressor of the speed of the engine and a usually intermediate gear with fixed gear is eliminated.
- an influence of the control unit takes place on the transmission upstream of the compressor unit and not directly on the compressor unit in order to effect the energy saving. Since the air demand control does not work here only on and off the compressor unit, the wear within the compressor assembly remains low. Furthermore, this also makes it possible to drive various auxiliary units - such as power steering or hydraulic pump - permanently with the minimum required speed for this purpose.
- the speed-variable transmission unit according to the invention is designed as an adjustable, continuously variable transmission, which is controlled by the control unit.
- a continuously variable transmission does not require elaborate automatic actuators and delivers the transmission ratio spectrum required for the present application.
- the control of the transmission unit for varying the speed is carried out according to the invention via an electrical signal which is generated by a superordinate vehicle control, in which the control unit for the transmission unit is integrated.
- the compressed air requirement is preferably determined by means of an actual pressure sensor which determines the actual pressure, the control unit in communication with the pressure sensor signaling a compressed air requirement for controlling the transmission unit when the actual pressure falls below a predefined setpoint pressure decreases.
- an electrical pressure sensor it is also conceivable to use a mechanical pressure sensor which detects the actual pressure in the compressed air system, for example via a spring-loaded membrane plunger arrangement or the like.
- FIG. 1 shows a schematic block diagram of an air-demand-controlled compressor assembly for a commercial vehicle.
- This consists essentially of a motor unit 1 for generating a rotational movement, here the internal combustion engine of the commercial vehicle.
- the rotational movement generated is fed to a downstream transmission unit 2 and reduced.
- a compressor unit 3 is arranged, which uses the rotational movement for generating compressed air from the ambient air in a conventional manner.
- the compressed air generated by the compressor unit 3 is the output side via a compressed air line 4 a - not shown here - compressed air system of the commercial vehicle available.
- the compressor assembly also includes means for air demand control via influencing the speed of the variable-speed transmission unit 2, which is designed here as an adjustable continuously variable transmission.
- an electronic control unit 5 is provided for controlling 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 the actual pressure-detecting electrical pressure sensor 7 and provided as a signal via an electrical signal line 8 on the input side of the control unit 5.
- the control unit 5 compares the actual pressure with a stored, predefined set pressure which defines a limit pressure of the pressure system, which must not be exceeded.
- the control unit 5 signals the variable-speed gear unit 2 via an electrical signal line 9 is a command to increase the gear ratio, so that the output-side speed for driving the compressor unit 3 increases under load to cover the signaled via the pressure sensor 7 compressed air demand.
- an upper pressure threshold in the printing system of the variable speed transmission unit 2 is signaled by a corresponding command that the transmission ratio has to change again such that the output side of the variable speed transmission unit 2, a low speed for driving the compressor unit 3 is provided and the Compressor unit 3 enters idle.
- the air demand control according to the invention requires only a minimum amount of maintenance of the mechanical components of the compressor assembly and is characterized by an energy-saving effect with high efficiency.
- the invention is not limited to the above-mentioned embodiment but also includes modifications thereof, which are included within the scope of the claims.
- the invention is not limited solely to electronic pressure sensors. Also conceivable is a pneumatic-mechanical detection of the system pressure and its transmission to a suitable control unit.
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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)
Description
Die vorliegende Erfindung betrifft eine luftbedarfsgesteuerte Kompressoranordnung in Kombination mit einer Fahrzeugsteuerung eines Nutzfahrzeuges, 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 Druckluftbedarf eines Druckluftsystems des Nutzfahrzeuges auslöst, wobei die Getriebeeinheit nach Art eines Getriebes mit variierbarer Drehzahl ausgebildet ist und die Steuereinheit mit der Getriebeeinheit zusammenwirkt, um die Drehzahl der Getriebeeinheit entsprechend des Druckluftbedarfs anzupassen, wobei der Druckluftbedarf mittels eines den IST-Druck ermittelnden mechanischen oder elektrischen Drucksensor festellbar ist, 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.The present invention relates to an air-demand-controlled compressor assembly in combination with a vehicle control of a commercial vehicle, comprising a motor unit for generating a rotational movement, which drives a compressor unit for generating compressed air from the ambient air via an intermediate speed-gear unit, wherein a control unit, the compressed air generation in compressed air demand of a compressed air system Commercial vehicle triggers, wherein the transmission unit is designed in the manner of a transmission with variable speed and the control unit cooperates with the transmission unit to adjust the rotational speed of the gear unit according to the compressed air demand, the compressed air requirement by means of a IST-pressure determining mechanical or electrical pressure sensor can be fixed, wherein the control unit in communication with the pressure sensor signaled a compressed air demand for controlling the transmission unit when the Actual pressure drops below a predefined target pressure.
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 mainly installed in commercial vehicles to perform the compressed air procurement of the onboard compressed air system. The compressed air system on board a commercial vehicle is needed in particular for the supply of the brake system, air suspension, trailer and auxiliary consumers. 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" of the company KNORR-BREMSE Systems for Commercial Vehicles GmbH (Print No. P-3505-DE-01), a compressor unit emerges which is designed in the manner of a reciprocating compressor. A rotating crankshaft mounted in a compressor housing sets an input side Rotary movement by means of a crank mechanism in a linear movement of an associated, housed in a cylinder piston around which sucks ambient air in cooperation with a valve device and then compressed. Depending on the desired delivery rate, the compressor unit can be designed as one or more cylinders.
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 drive of the compressor unit usually takes place via the rotational movement generated by the internal combustion engine of the commercial vehicle. In most applications, a speed-transmitting gear unit is interposed between the internal combustion engine as a motor unit and the compressor unit. The gear unit is designed as a spur gear with a fixed gear ratio, which translates the speed input from the engine unit input speed 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 controller is provided in this known compressor arrangement, which ensures that the compressor unit is only put into operation when a compressed air demand in the compressed air system of the commercial vehicle. The compressed air requirement is in most cases determined via a pressure sensor which is connected to the system pressure. If the system pressure falls below a predetermined threshold pressure, then the compressor unit is put into operation in order to build up a sufficient air pressure again. For storing the built-up pressure usually additional pressure vessels are 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.In order to realize such demand control for the commissioning of the compressor unit, the compressor unit can be switched between a delivery phase and an idling phase. In the delivery phase, compressed air is generated from the ambient air and fed into the compressed air system. In contrast, the compressor unit runs in the idle phase without load, so that although a piston movement is performed, but no compressed air enters the compressed air system. This is discharged to the outside. Because in the idle phase due to the loss of load compared to the funding phase much less power is absorbed by the compressor unit, this type of air demand control contributes to energy saving.
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 is often operated with very low duty cycle of 5 - 10% in the production phase, which is due to the predominant long-distance traffic operation on the highway. With this small duty cycle, the relatively high duty cycle of approximately 90% of the idling phase gains in weight, so that due to the still considerable power consumption in the idling phase, the energy consumption in idle mode is greater overall than during load operation. This result is also exacerbated by the fact that the compressor unit is often oversized for normal operation in order to produce a high pressure in the compressed air system within a very short time. This is especially the case when filling the compressed air system with empty pressure vessels, the operation of lifting axles, etc. the case. Overall, the known air demand control leads to energy savings so 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.In the general state of the art, an air demand control is also known, which uses an operable disconnect clutch between the engine unit and the compressor unit, whereby the compressor unit is brought to a standstill when a compressed air demand does not exist. However, such a compressor unit operated in comparison to a permanent idling quite a high wear, due to lack of lubricating effect during cold start. Furthermore, also required for this air demand control operable disconnect clutch wear, so that in this alternative known solution overall, a fairly high maintenance is. Another disadvantage is that due to the complete power flow separation through the clutch no possibility to drive various accessories - such as power steering or hydraulic pump - exists.
Des Weiteren geht aus der
Schließlich offenbart die
Es ist nun die Aufgabe der vorliegenden Erfindung eine luftbedarfsgesteuerte Kompressoranordnung der eingangs beschriebenen Art dahingehend weiter zu verbessern, dass eine drehzahlvariierbare Getriebeeinheit geeignete Übersetzungsverhältnisse bei gleichzeitig einfachem Aufbau der Kompressoranordnung liefert.It is now the object of the present invention to further improve an air-demand-controlled compressor arrangement of the type described above to the extent that a variable-speed transmission unit supplies suitable transmission ratios while at the same time providing a simple construction of the compressor arrangement.
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 object is achieved on the basis of an air-demand-controlled compressor arrangement according to the preamble of claim 1 in conjunction with its characterizing features. The following dependent claims give advantageous developments of the invention.
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 the coming in the context of a compressor assembly used gear unit is designed in the manner of a transmission with variable speed, and that the control unit with the Gear unit cooperates to adjust the speed of the gear unit according to the compressed air demand.
Der Vorteil liegt hierbei insbesondere darin, dass 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 hierbei 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 hierdurch auch möglich, diverse Zusatzaggregate - wie Lenkhilfe oder Hydraulikpumpe - permanent mit der hierfür minimal erforderlichen Drehzahl anzutreiben.The advantage here is in particular that the high proportion of energy consumption in the vast idling operation of the compressor unit is significantly reduced by the speed of the compressor unit is reduced in this case. The thus achieved adaptation of the compressor power to the pressure demand is thus based on an analogous variation of the speed of the compressor, so that a direct dependence of the speed of the compressor of the speed of the engine and a usually intermediate gear with fixed gear is eliminated. Furthermore, in this case an influence of the control unit takes place on the transmission upstream of the compressor unit and not directly on the compressor unit in order to effect the energy saving. Since the air demand control does not work here only on and off the compressor unit, the wear within the compressor assembly remains low. Furthermore, this also makes it possible to drive various auxiliary units - such as power steering or hydraulic pump - permanently with the minimum required speed for this purpose.
Die drehzahlvariierbare Getriebeeinheit ist erfindungsgemäß als ein einstellbares, stufenloses Getriebe ausgebildet, dessen Ansteuerung 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 speed-variable transmission unit according to the invention is designed as an adjustable, continuously variable transmission, which is controlled by the control unit. A continuously variable transmission does not require elaborate automatic actuators and delivers the transmission ratio spectrum required for the present application.
Die Ansteuerung der Getriebeeinheit zur Variierung der Drehzahl erfolgt erfindungsgemäß über ein elektrisches Signal, welches von einer übergeordneten Fahrzeugsteuerung erzeugt wird, in welcher die Steuereinheit für die Getriebeeinheit integriert ist.The control of the transmission unit for varying the speed is carried out according to the invention via an electrical signal which is generated by a superordinate vehicle control, in which the control unit for the transmission 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 sensor which determines the actual pressure, the control unit in communication with the pressure sensor signaling a compressed air requirement for controlling the transmission unit when the actual pressure falls below a predefined setpoint pressure decreases. Alternatively to an electrical pressure sensor, however, it is also conceivable to use a mechanical pressure sensor which detects the actual pressure in the compressed air system, for example via a spring-loaded membrane plunger arrangement or the like.
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 will be described in more detail below together with the description of a preferred embodiment of the invention with reference to the single figure. The figure shows a schematic block diagram of an air-demand-controlled compressor assembly 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 consists essentially of a motor unit 1 for generating a rotational movement, here the internal combustion engine of the commercial vehicle. The rotational movement generated is fed to a
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. 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 compressor assembly also includes means for air demand control via influencing the speed of the variable-
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 amount of maintenance of the mechanical components of the compressor assembly and is characterized by an 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.The invention is not limited to the above-mentioned embodiment but also includes modifications thereof, which are included within the scope of the claims. Thus, the invention is not limited solely to electronic pressure sensors. Also conceivable is a pneumatic-mechanical detection of the system pressure and its transmission to a suitable control unit.
Claims (3)
- Compressor system controlled by air demand, in combination with a vehicle control system (6) of a commercial vehicle, comprising an engine unit (1) in the form of an internal combustion engine for generating a rotary movement that drives a compressor unit (3) via an interposed gearing unit (2) transmitting numbers of revolution, for generating compressed air from ambient air, wherein a controller unit (5) triggers the generation of compressed air in the case of compressed-air demand of a compressed-air system of the commercial vehicle, with said gearing unit (2) being configured in the manner of a gear box with variable number of revolutions and with said controller unit (5) interacting with said gearing unit (2) for adapting the number of revolutions of said gearing unit (2) in correspondence with the compressed-air demand, wherein the compressed-air demand can be detected by means of a mechanical or electrical pressure sensor (7) that detects the actual pressure, with said controller unit (5) communicating with said pressure sensor (7) and signalling compressed-air demand for control of said gearing unit (2) precisely by the time when the actual pressure drops below a pre-defined rated pressure,
characterised in that said gearing unit (2) variable in terms of the number of revolutions is configured as an infinitely variable gear box that can be set via said controller unit (5), with the control of said gearing unit (2) being performed via an electrical signal generated by said controller unit (5), wherein said electrical signal for control of said gearing unit (2) can be generated by said controller unit (5) that is integrated into the vehicle control system (6). - Compressor system controlled by air demand according to Claim 1,
characterised in that a power steering unit and/or a hydraulic pump can be permanently driven as supplementary units via said gearing unit (2), in addition to said compressor unit (3), wherein said controller unit (5) takes the speed or power demand of said supplementary units equally into consideration in control of said gearing unit (2). - Air-procuring system of a commercial vehicle,
characterised by a compressor system controlled by air demand, according to any of the preceding claims.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10240162 | 2002-08-30 | ||
| DE10240162A DE10240162A1 (en) | 2002-08-30 | 2002-08-30 | Air demand controlled compressor arrangement, especially for commercial vehicles |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1394415A2 EP1394415A2 (en) | 2004-03-03 |
| EP1394415A3 EP1394415A3 (en) | 2009-07-01 |
| EP1394415B1 true EP1394415B1 (en) | 2013-04-17 |
Family
ID=31197540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03018780.1A Expired - Lifetime EP1394415B1 (en) | 2002-08-30 | 2003-08-28 | Capacity controlled compressor for commercial vehicles |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US7600988B2 (en) |
| EP (1) | EP1394415B1 (en) |
| DE (1) | DE10240162A1 (en) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4438955B2 (en) | 2005-04-01 | 2010-03-24 | トヨタ自動車株式会社 | Pressure accumulator |
| US20070188013A1 (en) * | 2006-02-16 | 2007-08-16 | Hoffman Fred W | Hydraulically powered air charging arrangement |
| DE102008006860A1 (en) | 2008-01-31 | 2009-08-06 | Haldex Brake Products Gmbh | Compressed air delivery flow controlling method for motor vehicle, involves controlling delivery flow of compressed air based on actual, estimated or expected air consumption, which is determined based operating signals |
| US9688260B2 (en) * | 2008-11-28 | 2017-06-27 | Volvo Truck Corporation | Vehicle comprising an air compressor system and method for operating a vehicle air compressor system |
| US8942883B2 (en) * | 2009-12-17 | 2015-01-27 | GM Global Technology Operations LLC | Sensor messaging systems and methods |
| DE102010038064B4 (en) | 2010-10-08 | 2013-02-21 | Haldex Brake Products Gmbh | Air drying cartridge |
| ITTO20111126A1 (en) * | 2011-12-09 | 2013-06-10 | Vhit Spa | ADJUSTABLE FLOW PUMPING SYSTEM, PUMP FOR THIS SYSTEM AND PUMP FLOW REGULATION METHOD |
| EP2708429B1 (en) | 2012-09-12 | 2015-08-26 | KNORR-BREMSE Systeme für Nutzfahrzeuge GmbH | Compressed air system for a motor vehicle |
| DE102012223996A1 (en) * | 2012-12-20 | 2014-06-26 | Siemens Aktiengesellschaft | Air pressure generating device for a rail vehicle |
| DE102013113556A1 (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 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 |
| 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 |
| SE540314C2 (en) | 2015-11-04 | 2018-06-12 | Scania Cv Ab | Method and system for connecting a selectively switchable compressor to an internal combustion engine |
| US20210080172A1 (en) * | 2017-05-10 | 2021-03-18 | Nuovo Pignone Tecnologie - S.R.L. | Compressor train arrangements |
| WO2019060871A1 (en) * | 2017-09-25 | 2019-03-28 | Carrier Corporation | Pressure safety shutoff |
| DE102020100296A1 (en) * | 2020-01-09 | 2021-07-15 | Knorr-Bremse Systeme für Schienenfahrzeuge GmbH | Compressor system and method for operating a compressor system as a function of the compressed air requirement of an operating state of the vehicle |
| US12180964B1 (en) | 2024-04-02 | 2024-12-31 | Bendix Commercial Vehicle Systems Llc | Apparatus and method for controlling a vehicle air compressor to track water content in compressor oil |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3365906A (en) * | 1966-02-01 | 1968-01-30 | Ernest A. Zadig | Automobile air conditioning system |
| 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 |
| US4655693A (en) * | 1980-10-27 | 1987-04-07 | Champion Spark Plug Company | Compressor apparatus |
| DE3216815A1 (en) * | 1982-05-05 | 1983-11-10 | Knorr-Bremse GmbH, 8000 München | CONTROL DEVICE FOR REGENERATING AN AIR DRYER FOR A PNEUMATIC SYSTEM, ESPECIALLY A VEHICLE BRAKE SYSTEM |
| EP0106612A1 (en) * | 1982-10-09 | 1984-04-25 | Bendix Limited | Improvements to compressor assemblies |
| DE3814750A1 (en) * | 1988-04-30 | 1989-02-02 | Mtu Friedrichshafen Gmbh | Device for driving a lubricant pump of an internal combustion engine |
| US5039281A (en) * | 1989-12-26 | 1991-08-13 | General Electric Company | Method and apparatus for supplying compressed air to auxiliary systems of a vehicle |
| US5125806A (en) * | 1990-06-18 | 1992-06-30 | Sundstrand Corporation | Integrated variable speed compressor drive system |
| SE9400575L (en) * | 1994-02-18 | 1995-08-19 | Volvo Ab | Device for charging air systems on trucks |
| DE10034735A1 (en) * | 1999-08-24 | 2001-03-08 | Luk Lamellen & Kupplungsbau | Procedure for controlling operation of at least one auxiliary aggregate of IC engine that is driven by engine via gearbox with variable transmission ratio has gearbox |
-
2002
- 2002-08-30 DE DE10240162A patent/DE10240162A1/en not_active Withdrawn
-
2003
- 2003-08-28 EP EP03018780.1A patent/EP1394415B1/en not_active Expired - Lifetime
- 2003-09-02 US US10/652,619 patent/US7600988B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| US7600988B2 (en) | 2009-10-13 |
| DE10240162A1 (en) | 2004-03-18 |
| US20040136840A1 (en) | 2004-07-15 |
| EP1394415A3 (en) | 2009-07-01 |
| EP1394415A2 (en) | 2004-03-03 |
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