EP1664502A1 - Device for compressing combustion air - Google Patents

Device for compressing combustion air

Info

Publication number
EP1664502A1
EP1664502A1 EP04738816A EP04738816A EP1664502A1 EP 1664502 A1 EP1664502 A1 EP 1664502A1 EP 04738816 A EP04738816 A EP 04738816A EP 04738816 A EP04738816 A EP 04738816A EP 1664502 A1 EP1664502 A1 EP 1664502A1
Authority
EP
European Patent Office
Prior art keywords
compressor
charge air
connecting means
compressing
air compressor
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.)
Withdrawn
Application number
EP04738816A
Other languages
German (de)
French (fr)
Inventor
Michael Baeuerle
Carsten Reisinger
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1664502A1 publication Critical patent/EP1664502A1/en
Withdrawn legal-status Critical Current

Links

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
    • F02B33/00—Engines characterised by provision of pumps for charging or scavenging
    • F02B33/32—Engines with pumps other than of reciprocating-piston type
    • F02B33/34—Engines with pumps other than of reciprocating-piston type with rotary pumps
    • 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
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/04—Engines with exhaust drive and other drive of pumps, e.g. with exhaust-driven pump and mechanically-driven second pump
    • 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
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/16—Control of the pumps by bypassing charging air
    • 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
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
    • 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
    • F02B39/00—Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
    • F02B39/02—Drives of pumps; Varying pump drive gear ratio
    • F02B39/08—Non-mechanical drives, e.g. fluid drives having variable gear ratio
    • F02B39/10—Non-mechanical drives, e.g. fluid drives having variable gear ratio electric
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to a device for compressing combustion air, in particular a device for compressing charge air for a motor vehicle internal combustion engine according to the preamble of claim 1.
  • the exhaust gas turbocharger has a turbine which is arranged in the exhaust gas flow of the internal combustion engine and operates a compressor which is arranged in the charge air supply of the internal combustion engine.
  • Electric motor as well as the possibility of generating a high electrical power requirement, which is necessary due to the large moment of inertia of the turbine of an exhaust gas turbocharger.
  • a bypass solution is used, for example, to feed the charge air directly to the exhaust gas turbocharger, bypassing the additional electrical compressor that is then not required.
  • the drive power is limited to a few kW due to the additional electrical system load. This is important in particular when the compressor wheel of an additional electrical compressor starts up, since the start-up time depends mainly on the available drive power and the mass moment of inertia of the rotor to be accelerated
  • the device according to the invention for compressing combustion air in particular for compressing charge air for a motor vehicle internal combustion engine with the features of claim 1, enables reduced electrical energy consumption when accelerating the additional electrical compressor.
  • the configuration of the device according to the invention, in particular the connecting means according to the invention, which make it possible to guide compressed charge air into the compression space of the electric charge air compressor, makes it possible to accelerate the start-up of the additional electrical compressor by means of pre-acceleration to allow the introduced, compressed air. This reduces both the required acceleration energy of the additional electric compressor and its response time until it reaches its maximum speed.
  • the upshifting process during an acceleration phase of the vehicle is generally preceded by a reduction in the boost pressure.
  • a so-called diverter valve has been opened to avoid the so-called “compressor pumping" when gas is removed from the boost pressure area.
  • the charge pressure carrying volume is evacuated to approximately ambient pressure. The pneumatic energy released by this measure was not used.
  • the device according to the invention it is possible to use the pneumatic energy of the charge air system to assist in accelerating the additional electric compressor. Since the upshifting process is usually preceded by a boost pressure reduction via the air recirculation valve during an acceleration phase of the vehicle, the air to be discharged can be used to accelerate the electric charge air compressor for the upcoming acceleration process of the motor vehicle. It is thus possible to realize the rebuilding of the boost pressure, which is important for the acceleration phase of the motor vehicle, with the support of the additional electric compressor much faster.
  • the pneumatic energy contained in the compressed charge air can be used effectively to pre-accelerate the electric auxiliary compressor.
  • the connecting means open into an annular channel of the housing of the electric charge air compressor.
  • the connecting means advantageously open on the low-pressure side of the compression space of the electric charge air compressor. Appropriate openings in the wall of the compressor chamber can achieve that a directed air flow strikes, for example, the compressor blades of the compressor wheel of the electric charge air compressor and thus supports the run-up of the compressor wheel.
  • the annular duct of the compressor, into which the connecting means open, advantageously has a plurality of inlet points for the compressed charge air distributed over its circumference.
  • the inlet points are to be designed in such a way that a jet-like air flow is formed to accelerate the compressor wheel.
  • the connecting means which make it possible to conduct compressed charge air into the compression space of the electric charge air compressor, has a valve which prevents the air from the electric charge air compressor from flowing back towards the second charge air compressor via these connecting means.
  • This valve or the valves can advantageously be designed as an electronically controllable diaphragm valve (s).
  • valve or the valves for preventing backflow can advantageously be integrated directly into the housing of the electric charge air compressor.
  • Figure 1 is a schematic representation of an embodiment of the device according to the invention in a detailed representation.
  • FIG. 1 shows an exemplary embodiment of a device according to the invention for compressing combustion air, in particular for compressing charge air for an automotive internal combustion engine, in a simplified, schematic detailed illustration.
  • the charge air to be compressed is fed to a first compressor 12 via an intake opening 10.
  • This first compressor 12 is an electrically operated, so-called additional compressor 14.
  • the additional electrical compressor 14 essentially consists of a compressor unit 16 and an electrical drive unit 18.
  • the charge air to be compressed is fed to the compressor chamber 22 of the additional electrical compressor 14 via an inlet opening 20.
  • a compressor wheel 24 is arranged in the compressor chamber 22 and is driven by the electric drive unit 18 via a shaft.
  • the charge air to be compressed is in the
  • the additional electrical compressor 14 of the device according to the invention is connected via connecting means 30 to a second charge air compressor 32, which in the exemplary embodiment according to FIG. 1 is designed as an exhaust gas turbocharger 34.
  • the exhaust gas turbocharger 34 has a compressor wheel 38 which is arranged in a compressor space 36 and is driven via a shaft 40 by a turbine 42 which in the exhaust gas stream of an internal combustion engine (not shown) Motor vehicle is arranged. In a known manner, the kinetic energy of the hot exhaust gas stream 44 serves to drive the turbine 42, which in turn can thus accelerate the compressor wheel 38 of the exhaust gas turbocharger 34.
  • the air pre-compressed by the electrical additional compressor 14 is in the
  • Compressor chamber 36 of exhaust-gas turbocharger 34 is further compressed and fed via connecting means 46 to the internal combustion engine (not shown in FIG. 1).
  • These connecting means 46 can also have, for example, a charge air cooler (not shown) or a throttle valve for the charge air flow.
  • a valve 48 which the volume flow of the exhaust gas through a
  • Bypass channel 50 regulates around the drive turbine of the exhaust gas turbocharger 34, the compressor output of the exhaust gas turbocharger can be controlled.
  • This two-stage device for compressing charge air makes it possible to largely avoid the so-called turbocharger hole, which occurs at low engine speeds and thus with a low exhaust gas flow 44.
  • turbocharger hole which occurs at low engine speeds and thus with a low exhaust gas flow 44.
  • the additional electric compressor 14 is turned on to achieve a desired pre-compression of the charge air.
  • This additional electrical compressor makes it possible to compensate for the disadvantage of a delayed and inadequate response behavior of an exhaust gas turbocharger.
  • the electrical auxiliary compressor is therefore only switched on for a short time due to its task and requires the fastest possible response characteristics. This process is typical of acceleration situations and occurs particularly practically with all gear changes (upshifting) of the vehicle. If you look at the switch-on behavior of the additional electric compressor, you can see that especially in the
  • the electric auxiliary compressor must be accelerated to approx. 60,000 rpm with every full load acceleration.
  • a mechanical rotational energy in the range of 400 to 500 watt seconds is absorbed, which must be made available by the electrical on-board system of the motor vehicle.
  • the upshift during one The acceleration phase is usually preceded by a boost pressure reduction via a so-called air recirculation valve. So far, to avoid compressor pumping, for example, when “taking gas off”, the boost pressure in the system has been reduced by opening the so-called diverter valve (dump valve). As a result, the boost pressure-carrying volume is evacuated to approximately ambient pressure used.
  • connecting means 52 are provided, which make it possible to direct already compressed charge air directly into the compression space of the electric charge air compressor, in order to enable the additional electric compressor to start up more quickly by pre-acceleration.
  • the connecting means 52 branch off from the connecting means 46, which connect the exhaust gas turbocharger to the internal combustion engine.
  • the connecting means 52 lead via a valve 54 directly into the compressor chamber 22 of the additional electrical compressor 14.
  • openings 56 can be provided, which target the compressed and branched off via the connecting means 52 charge air lead into the ring channel 26 and then onto the compressor blades of the compressor wheel 24.
  • This nozzle-shaped introduction of the compressed charge air onto the compressor blades of the compressor wheel of the electrical auxiliary compressor enables the auxiliary compressor to be pre-accelerated, which leads to faster startup, that is to say to a shorter response characteristic of the auxiliary compressor.
  • valve 14 integrated and can for example also include one or more valves, which avoids a backflow of the charge air to be compressed via the connecting means 52.
  • care must be taken to ensure that the charge air to be accelerated by the additional electrical compressor is discharged through the outlet opening 28 of the additional compressor and can thus be supplied to the downstream exhaust gas turbocharger 34. On Flow of the charge air compressed by the additional electrical compressor via the connecting means 52 must be prevented.
  • the connecting means 52 comprise a storage volume 58, into which compressed charge air is directed and then can be stored at high pressure.
  • the compressed charge air can then be emitted directly into the compressor chamber of the additional electrical compressor at a desired point in time.
  • the upshifting process during an acceleration phase is usually immediately preceded by a boost pressure reduction via a recirculation valve and then the boost pressure is rebuilt with the support of the additional electrical compressor.
  • the charge pressure reduction can be advantageous by the device according to the invention
  • the pneumatic energy of the charge air system includes even when considering a moderate efficiency to transfer its energy to the electrical
  • the device according to the invention is not limited to the exemplary embodiment shown in FIG. 1.
  • the device according to the invention is not limited to the use of an additional electrical compressor and an exhaust gas turbocharger.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supercharger (AREA)

Abstract

The invention relates to a device for compressing combustion air, particularly a device for compressing charge air for an internal combustion engine for a motor vehicle, comprising at least one electrically operated charge air compressor (12, 14) which is provided with at least one compressor wheel (24) which is arranged in a compressor chamber (22) and which is driven by an electric motor (18), also comprising a second charge air compressor (32,34), particularly an exhaust gas turbo charger (34), which is serially mounted in relation to the electric charge air compressor (32,34), which are fluidically connected to each other by means of connecting means (30). According to the invention, connecting means (52) are used to guide already compressed air into the combustor chamber (22) of the electric charge air compressor (14).

Description

Vorrichtung zur Verdichtung von VerbrennungsluftCombustion air compression device
Stand der TechnikState of the art
Die Erfindung betrifft eine Vorrichtung zur Verdichtung von Verbrennungsluft, insbesondere eine Vorrichtung zur Verdichtung von Ladeluft für eine kraftfahrzeugtechnische Verbrennungsmaschine nach der Gattung des Anspruchs 1.The invention relates to a device for compressing combustion air, in particular a device for compressing charge air for a motor vehicle internal combustion engine according to the preamble of claim 1.
Es ist bekannt, die Leistungsdichten einer kraftfahrzeugtechnischen Verbrennungsmaschine durch Verdichtung der zur Verbrennung des Kraftstoffes benötigten Ladeluft zu erhöhen. Dazu werden in der Regel Abgasturbolader benutzt. Der Abgasturbolader weist dabei eine Turbine auf, die im Abgasstrom des Verbrennungsmotors angeordnet ist und einen, in der Ladeluftzuführung der Brennkraftmaschine angeordneten Verdichter betreibt.It is known to increase the power densities of an automotive internal combustion engine by compressing the charge air required to combust the fuel. Exhaust gas turbochargers are usually used for this. The exhaust gas turbocharger has a turbine which is arranged in the exhaust gas flow of the internal combustion engine and operates a compressor which is arranged in the charge air supply of the internal combustion engine.
Abgasturbolader weisen, insbesondere bei Kraftfahrzeugantrieben, den Nachteil eines verzögerten und unzureichenden Ansprechverhaltens bei niedrigen Drehzahlen der Brennkraftmaschine auf ("Turboladerloch").Exhaust gas turbochargers, particularly in the case of motor vehicle drives, have the disadvantage of a delayed and inadequate response behavior at low engine speeds (“turbocharger hole”).
Zur Verbesserung der Ladeluftzuftihrung speziell im Bereich niedriger Drehzahlen derTo improve the charge air supply especially in the area of low engine speeds
Brennkraftmaschine ist es bekannt, den Abgasturbolader mittels eines elektrischen Hilfsantriebes zu unterstützen. Dies kann beispielsweise durch einen in den Abgasturbolader integrierten Elektromotor erreicht werden. Bei niedrigen Drehzahlen der Brennkraftmaschine treibt der Elektromotor die Welle des Abgasturboladers unterstützend an. Dies erfordert jedoch sowohl eine hohe Drehzahlbelastbarkeit desInternal combustion engine, it is known to support the exhaust gas turbocharger by means of an electrical auxiliary drive. This can be achieved, for example, by an electric motor integrated in the exhaust gas turbocharger. At low engine speeds, the electric motor supports the exhaust gas turbocharger shaft. However, this requires both a high speed load capacity of the
Elektromotors, als auch die Möglichkeit der Generierung eines hohen elektrischen Leistungsbedarfs, der auf Grund des großen Massenträgheitsmomentes der Turbine eines Abgasturboladers notwendig ist.Electric motor, as well as the possibility of generating a high electrical power requirement, which is necessary due to the large moment of inertia of the turbine of an exhaust gas turbocharger.
Zur Vermeidung dieser Nachteile ist beispielsweise aus der US 6,029,452 bekannt, einen separaten, rein elektrisch betriebenen Hilfslader (elektrischer Zusatzverdichter, EZV) in die Ladeluftzuftihrung einer Brennkraftmaschine zu integrieren. Der elektrische Zusatzverdichter wird dabei in Reihe zu einem konventionellen Abgasturbolader betrieben und dient zumeist zur Vorverdichtung der dem Abgasturbolader zugeführten Ladeluft. Dies hat den Vorteil, dass der separat in der Ladeluftzuführung eingesetzte elektrische Zusatzverdichter auf einen Einsatz im untersten Drehzahlbereich der Brennkraftmaschine optimiert werden kann. Im hohen Drehzahlbereich der Brennkraftmaschine, der seinerseits zu einer hohen Drehzahl des Abgasturboladers führt, wird beispielsweise eine Bypass-Lösung verwandt, um die Ladeluft unter Umgehung des dann nicht benötigten elektrischen Zusatzverdichters direkt dem Abgasturbolader zuzuführen.To avoid these disadvantages, it is known, for example, from US Pat. No. 6,029,452 to integrate a separate, purely electrically operated auxiliary charger (additional electric compressor, EZV) into the charge air supply of an internal combustion engine. The additional electric compressor is operated in series with a conventional exhaust gas turbocharger and is mostly used to pre-compress the charge air supplied to the exhaust gas turbocharger. This has the advantage that it is used separately in the charge air supply electrical additional compressors can be optimized for use in the lowest speed range of the internal combustion engine. In the high speed range of the internal combustion engine, which in turn leads to a high speed of the exhaust gas turbocharger, a bypass solution is used, for example, to feed the charge air directly to the exhaust gas turbocharger, bypassing the additional electrical compressor that is then not required.
Einer der Hauptunterschiede zwischen einem elektrischen Zusatzverdichter und einem klassischen Abgasturbolader ist die sehr unterschiedliche, zur Verfügung stehende Antriebsleistung für diese Systeme. Diese kann bei einem Abgasturbolader mehrereOne of the main differences between an additional electric compressor and a classic exhaust gas turbocharger is the very different drive power available for these systems. This can be several in one exhaust gas turbocharger
10 kW betragen, bei einem elektrischen Zusatzverdichter ist die Antriebsleistung jedoch wegen der zusätzlichen Bordnetzbelastung maximal auf einige wenige kW begrenzt. Insbesondere beim Hochlaufen des Verdichterrades eines elektrischen Zusatzverdichters ist dies von Bedeutung, da die Anlaufzeit hauptsächlich von der verfügbaren Antriebsleistung und dem Massenträgheitsmoment des zu beschleunigenden Rotors des10 kW, but with an additional electric compressor, the drive power is limited to a few kW due to the additional electrical system load. This is important in particular when the compressor wheel of an additional electrical compressor starts up, since the start-up time depends mainly on the available drive power and the mass moment of inertia of the rotor to be accelerated
Zusatzverdichters bestimmt ist.Additional compressor is determined.
Betrachtet man das Einschaltverhalten eines elektrischen Zusatzverdichters, so erkennt man, dass gerade im Stadtverkehr eine deutliche Anzahl von Einschaltzuständen des Verdichters erforderlich ist. Bei jeder Volllastbeschleunigung ist der elektrischeIf you consider the switch-on behavior of an additional electric compressor, you can see that a clear number of switch-on states of the compressor is required, especially in city traffic. With every full load acceleration the electrical
Zusatzverdichter dabei auf Umdrehungen bis zu ca. 60.000 pro Minute zu beschleunigen. Dabei wird eine mechanische Rotationsenergie von typischerweise 450 Wattsekunden aufgenommen, die vom Bordnetz des Fahrzeuges zur Verfügung gestellt werden müssen.Accelerating additional compressors to revolutions of up to approx. 60,000 per minute. A mechanical rotational energy of typically 450 watt seconds is absorbed, which must be made available by the vehicle's electrical system.
Vorteile der ErfindungAdvantages of the invention
Die erfindungsgemäße Vorrichtung zur Verdichtung von Verbrennungsluft, insbesondere zur Verdichtung von Ladeluft für eine kraftfahrzeugtechnische Verbrennungsmaschine mit den Merkmalen des Anspruchs 1 ermöglicht eine reduzierte elektrische Energieaufnahme beim Beschleunigen des elektrischen Zusatzverdichters.The device according to the invention for compressing combustion air, in particular for compressing charge air for a motor vehicle internal combustion engine with the features of claim 1, enables reduced electrical energy consumption when accelerating the additional electrical compressor.
Durch die erfindungsgemäße Ausgestaltung der Vorrichtung, insbesondere durch die erfindungsgemäßen Verbindungsmittel, die es ermöglichen, verdichtete Ladeluft in den Verdichterraum des elektrischen Ladeluftverdichters zu leiten, ist es möglich, das Hochlaufen des elektrischen Zusatzverdichters durch eine Vorbeschleunigung auf Grund der eingeleiteten, verdichteten Luft zu ermöglichen. Damit wird sowohl die notwendige Beschleunigungsenergie des elektrischen Zusatzverdichters, als auch seine Ansprechzeit bis zum Erreichen seiner Maximaldrehzahl, reduziert.The configuration of the device according to the invention, in particular the connecting means according to the invention, which make it possible to guide compressed charge air into the compression space of the electric charge air compressor, makes it possible to accelerate the start-up of the additional electrical compressor by means of pre-acceleration to allow the introduced, compressed air. This reduces both the required acceleration energy of the additional electric compressor and its response time until it reaches its maximum speed.
Dem Hochschaltvorgang während einer Beschleunigungsphase des Fahrzeuges geht in der Regel ein Ladedruckabbau unmittelbar voraus. Bisher wurde zur Vermeidung des sogenannten "Verdichterpumpens" bei Gaswegnahme aus dem Ladedruckbereich ein sogenanntes Schubumluftventil geöffnet. Durch Öffnung dieses Schubumluftventils wird das Ladedruck führende Volumen auf näherungsweise Umgebungsdruck evakuiert. Die durch diese Maßnahme frei werdende pneumatische Energie wurde dabei nicht genutzt.The upshifting process during an acceleration phase of the vehicle is generally preceded by a reduction in the boost pressure. So far, a so-called diverter valve has been opened to avoid the so-called "compressor pumping" when gas is removed from the boost pressure area. By opening this diverter valve, the charge pressure carrying volume is evacuated to approximately ambient pressure. The pneumatic energy released by this measure was not used.
Mit der erfindungsge äßen Vorrichtung ist es möglich, die pneumatische Energie des Ladeluftsystems zur unterstützenden Beschleunigung des elektrischen Zusatzverdichters zu nutzen. Da dem Hochschaltvorgang während einer Beschleunigungsphase des Fahrzeuges in der Regel ein Ladedruckabbau über das Umluftventil vorausgeht, kann die abzuführende Luft genutzt werden, um den elektrischen Ladeluftverdichter für den anstehenden Beschleunigungsvorgang des Kraftfahrzeuges bereits zu beschleunigen. So ist es möglich, den für die Beschleunigungsphase des Kraftfahrzeuges wichtigen Wiederaufbau des Ladedruckes mit Unterstützung des elektrischen Zusatzverdichters deutlich schneller zu realisieren.With the device according to the invention, it is possible to use the pneumatic energy of the charge air system to assist in accelerating the additional electric compressor. Since the upshifting process is usually preceded by a boost pressure reduction via the air recirculation valve during an acceleration phase of the vehicle, the air to be discharged can be used to accelerate the electric charge air compressor for the upcoming acceleration process of the motor vehicle. It is thus possible to realize the rebuilding of the boost pressure, which is important for the acceleration phase of the motor vehicle, with the support of the additional electric compressor much faster.
Vorteilhafte Weiterbildungen und Ausführungsbeispiele der Erfindung werden durch die in den Unteransprüchen enthaltenen Merkmale ermöglicht.Advantageous further developments and exemplary embodiments of the invention are made possible by the features contained in the subclaims.
In vorteilhafter Weise sind die Verbindungsmittel, die es ermöglichen, verdichteteThe connecting means which make it possible are advantageously compacted
Ladeluft in den Verdichterraum des elektrischen Ladeluftverdichters zu leiten, abstromseitig des zweiten Ladeluftverdichters angeordnet, zweigen von dort ab und münden direkt in den Verdichterraum des elektrischen Ladeluftverdichters. Somit kann die in der verdichteten Ladeluft enthaltene pneumatische Energie in effektiver Weise zur Vorbeschleunigung des elektrischen Zusatzverdichters genutzt werden.To guide charge air into the compressor space of the electric charge air compressor, arranged downstream of the second charge air compressor, branch off from there and open directly into the compressor space of the electric charge air compressor. Thus, the pneumatic energy contained in the compressed charge air can be used effectively to pre-accelerate the electric auxiliary compressor.
Die Verbindungsmittel münden dabei in einen Ringkanal des Gehäuses des elektrischen Ladeluftverdichters. In vorteilhafter Weise münden die Verbindungsmittel auf der Niederdruckseite des Verdichtungsraumes des elektrischen Ladeluftverdichters. Durch entsprechende Öffnungen in der Wandung des Verdichterraumes kann erreicht werden, dass ein gerichteter Luftstrom beispielsweise auf die Verdichterschaufeln des Verdichterrades des elektrischen Ladeluftverdichters auftrifft und somit das Hochlaufen des Verdichterrades unterstützt.The connecting means open into an annular channel of the housing of the electric charge air compressor. The connecting means advantageously open on the low-pressure side of the compression space of the electric charge air compressor. Appropriate openings in the wall of the compressor chamber can achieve that a directed air flow strikes, for example, the compressor blades of the compressor wheel of the electric charge air compressor and thus supports the run-up of the compressor wheel.
In vorteilhafter Weise weist der Ringkanal des Verdichters, in den die Verbindungsmittel münden, eine Mehrzahl von über seinem Umfang verteilten Einleitstellen für die verdichtete Ladeluft auf. Dabei sind die Einleitstellen so auszubilden, dass sich ein möglichst jetartiger Luftstrom zur Beschleunigung des Verdichterrades ausbildet.The annular duct of the compressor, into which the connecting means open, advantageously has a plurality of inlet points for the compressed charge air distributed over its circumference. The inlet points are to be designed in such a way that a jet-like air flow is formed to accelerate the compressor wheel.
In einer vorteilhaften Ausführungsform der erfindungsgemäßen Vorrichtung zurIn an advantageous embodiment of the device according to the invention
Verdichtung von Verbrennungsluft weisen die Verbindungsmittel, die es ermöglichen, verdichtete Ladeluft in den Verdichterraum des elektrischen Ladeluftverdichters zu leiten, ein Ventil auf, das es verhindert, dass die Luft vom elektrischen Ladeluftverdichter über diese Verbindungsmittel zurück in Richtung des zweiten Ladeluftverdichters strömen kann. Dieses Ventil kann bzw. die Ventile können in vorteilhafter Weise als elektronisch ansteuerbare(s) Membranventil(e) ausgebildet sein.Compression of combustion air, the connecting means, which make it possible to conduct compressed charge air into the compression space of the electric charge air compressor, has a valve which prevents the air from the electric charge air compressor from flowing back towards the second charge air compressor via these connecting means. This valve or the valves can advantageously be designed as an electronically controllable diaphragm valve (s).
Das Ventil bzw. die Ventile zur Verhinderung der Rückströmung lassen sich in vorteilhafter Weise direkt in das Gehäuse des elektrischen Ladeluftverdichters integrieren.The valve or the valves for preventing backflow can advantageously be integrated directly into the housing of the electric charge air compressor.
Mit der erfindungsgemäßen Vorrichtung zur Verdichtung von Verbrennungsluft ist es somit in vorteilhafter Weise möglich, die notwendige Beschleunigungsenergie des elektrischen Zusatzverdichters sowie dessen Ansprechzeit deutlich zu reduzieren. Dies wiederum führt zu einer Entlastung des elektrischen Bordnetzes des Kraftfahrzeuges.With the device according to the invention for compressing combustion air, it is thus advantageously possible to significantly reduce the necessary acceleration energy of the additional electrical compressor and its response time. This in turn relieves the strain on the electrical system of the motor vehicle.
Weitere Vorteile der erfindungsgemäßen Vorrichtung sind der nachfolgenden Zeichnung sowie der zugehörigen Beschreibung eines Ausführungsbeispiels der erfindungsgemäßen Vorrichtung zu entnehmen.Further advantages of the device according to the invention can be found in the following drawing and the associated description of an exemplary embodiment of the device according to the invention.
Zeichnungdrawing
In der Zeichnung ist ein Ausführungsbeispiel der erfindungsgemäßen Vorrichtung zur Verdichtung von Verbrennungsluft dargestellt, das in der nachfolgenden Beschreibung näher erläutert wird. Die Figur der Zeichnung, deren Beschreibung sowie die Ansprüche enthalten zahlreiche Merkmale in Kombination. Ein Fachmann wird diese Merkmale auch einzeln betrachten und zu sinnvollen, weiteren Kombinationen zusammenfassen, die somit ebenfalls als in der Beschreibung offenbart anzusehen sind.In the drawing, an embodiment of the device for compressing combustion air according to the invention is shown, which is explained in more detail in the following description. The figure of the drawing, its description and the claims contain numerous features in combination. A person skilled in the art will also consider these features individually and combine them into meaningful, further combinations, which are therefore likewise to be regarded as disclosed in the description.
Es zeigt:It shows:
Figur 1 eine schematische Darstellung eines Ausführungsbeispiels der erfindungsgemäßen Vorrichtung in einer Detaildarstellung.Figure 1 is a schematic representation of an embodiment of the device according to the invention in a detailed representation.
Beschreibung des AusführungsbeispielsDescription of the embodiment
Figur 1 zeigt ein Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung zur Verdichtung von Verbrennungsluft, insbesondere zur Verdichtung von Ladeluft für eine kraftfahrzeugtechnische Verbrennungsmaschine in einer vereinfachten, schematischen Detaildarstellung.FIG. 1 shows an exemplary embodiment of a device according to the invention for compressing combustion air, in particular for compressing charge air for an automotive internal combustion engine, in a simplified, schematic detailed illustration.
Die zu verdichtende Ladeluft wird über eine Ansaugöffnung 10 einem ersten Verdichter 12 zugeführt. Dieser erste Verdichter 12 ist ein elektrisch betriebener, sogenannter Zusatzverdichter 14. Der elektrische Zusatzverdichter 14 besteht im Wesentlichen aus einer Verdichtereinheit 16 und einer elektrischen Antriebseinheit 18.The charge air to be compressed is fed to a first compressor 12 via an intake opening 10. This first compressor 12 is an electrically operated, so-called additional compressor 14. The additional electrical compressor 14 essentially consists of a compressor unit 16 and an electrical drive unit 18.
Über eine Eintrittsöffnung 20 wird die zu verdichtende Ladeluft dem Verdichterraum 22 des elektrischen Zusatzverdichters 14 zugeführt. Im Verdichterraum 22 ist ein Verdichterrad 24 angeordnet, welches über eine Welle von der elektrischen Antriebseinheit 18 angetrieben wird. Die zu verdichtende Ladeluft wird imThe charge air to be compressed is fed to the compressor chamber 22 of the additional electrical compressor 14 via an inlet opening 20. A compressor wheel 24 is arranged in the compressor chamber 22 and is driven by the electric drive unit 18 via a shaft. The charge air to be compressed is in the
Verdichterraum beschleunigt und typischerweise über einen Ringkanal 26 und eine Austrittsöffnung 28 aus dem elektrischen Zusatzverdichter 14 herausgeleitet.Accelerated compressor space and typically led out of the additional electrical compressor 14 via an annular channel 26 and an outlet opening 28.
Über Verbindungsmittel 30 ist der elektrische Zusatzverdichter 14 der erfindungsgemäßen Vorrichtung verbunden mit einem zweiten Ladeluftverdichter 32, der im Ausführungsbeispiel gemäß Figur 1 als Abgasturbolader 34 ausgebildet ist.The additional electrical compressor 14 of the device according to the invention is connected via connecting means 30 to a second charge air compressor 32, which in the exemplary embodiment according to FIG. 1 is designed as an exhaust gas turbocharger 34.
Der Abgasturbolader 34 besitzt ein in einem Verdichterraum 36 angeordnetes Verdichterrad 38, welches über eine Welle 40 von einer Turbine 42 angetrieben wird, welche im Abgasstrom eines nicht weiter dargestellten Verbrennungsmotors eines Kraftfahrzeuges angeordnet ist. In bekannter Weise dient die kinetische Energie des heißen Abgasstromes 44 zum Antrieb der Turbine 42, die somit wiederum das Verdichterrad 38 des Abgasturboladers 34 beschleunigen kann.The exhaust gas turbocharger 34 has a compressor wheel 38 which is arranged in a compressor space 36 and is driven via a shaft 40 by a turbine 42 which in the exhaust gas stream of an internal combustion engine (not shown) Motor vehicle is arranged. In a known manner, the kinetic energy of the hot exhaust gas stream 44 serves to drive the turbine 42, which in turn can thus accelerate the compressor wheel 38 of the exhaust gas turbocharger 34.
Die durch den elektrischen Zusatzverdichter 14 vorverdichtete Luft wird imThe air pre-compressed by the electrical additional compressor 14 is in the
Verdichterraum 36 des Abgasturboladers 34 weiter verdichtet und über Verbindungsmittel 46 dem in Figur 1 nicht weiter dargestellten Verbrennungsmotor zugeführt. Diese Verbindungsmittel 46 können beispielsweise auch noch einen nicht weiter dargestellten Ladeluftkühler oder ein Drosselventil für den Ladeluftstrom aufweisen. Über ein Ventil 48, welches den Volumenstrom des Abgases durch einenCompressor chamber 36 of exhaust-gas turbocharger 34 is further compressed and fed via connecting means 46 to the internal combustion engine (not shown in FIG. 1). These connecting means 46 can also have, for example, a charge air cooler (not shown) or a throttle valve for the charge air flow. Via a valve 48, which the volume flow of the exhaust gas through a
Bypasskanal 50 um die Antriebsturbine des Abgasturboladers 34 herum regelt, lässt sich die Verdichterleistung des Abgasturboladers steuern.Bypass channel 50 regulates around the drive turbine of the exhaust gas turbocharger 34, the compressor output of the exhaust gas turbocharger can be controlled.
Prinzipiell ist auch eine andere Reihenfolge der Verdichterstufen möglich.In principle, a different order of the compressor stages is also possible.
Diese zweistufige Vorrichtung zur Verdichtung von Ladeluft ermöglicht es, das sogenannte Turboladerloch, welches bei geringen Motordrehzahlen und somit bei einem geringen Abgasstrom 44 auftritt, weitgehend zu vermeiden. Im Bereich geringer Motordrehzahlen, bei denen der klassische Abgasturbolader 34 auf Grund seiner Antriebsturbine 42 keine hohen Drehzahlen und somit das gewünschte hoheThis two-stage device for compressing charge air makes it possible to largely avoid the so-called turbocharger hole, which occurs at low engine speeds and thus with a low exhaust gas flow 44. In the area of low engine speeds, at which the classic exhaust gas turbocharger 34, due to its drive turbine 42, does not have high speeds and thus the desired high speed
Verdichtungsverhältnis erzeugen kann, wird der elektrische Zusatzverdichter 14 eingeschaltet, um eine gewünschte Vorverdichtung der Ladeluft zu erreichen. Durch diesen elektrischen Zusatzverdichter ist es möglich, den Nachteil eines verzögerten und unzureichenden Ansprechverhaltens eines Abgasturboladers zu kompensieren.Can generate compression ratio, the additional electric compressor 14 is turned on to achieve a desired pre-compression of the charge air. This additional electrical compressor makes it possible to compensate for the disadvantage of a delayed and inadequate response behavior of an exhaust gas turbocharger.
Der elektrische Zusatzverdichter wird auf Grund seiner Aufgabe daher nur jeweils kurzfristig eingeschaltet und erfordert eine möglichst schnelle Ansprechcharakteristik. Dieser Vorgang ist typisch für Beschleunigungssituationen und tritt insbesondere praktisch bei allen Gangwechseln (Hochschalten) des Fahrzeuges auf. Betrachtet man das Einschaltverhalten des elektrischen Zusatzverdichters, so erkennt man, dass gerade imThe electrical auxiliary compressor is therefore only switched on for a short time due to its task and requires the fastest possible response characteristics. This process is typical of acceleration situations and occurs particularly practically with all gear changes (upshifting) of the vehicle. If you look at the switch-on behavior of the additional electric compressor, you can see that especially in the
Stadtverkehr eine deutliche Anzahl von Einschaltzuständen erforderlich ist. Bei jeder Volllastbeschleunigung ist der elektrische Zusatzverdichter auf ca. 60.000 U/min zu beschleunigen. Dabei wird eine mechanische Rotationsenergie im Bereich von 400 bis 500 Wattsekunden aufgenommen, die vom elektrischen Bordsystem des Kraftfahrzeuges zur Verfügung gestellt werden muss. Dem Hochschaltvorgang während einer Beschleunigungsphase geht in der Regel ein Ladedruckabbau über ein sogenanntes Umluftventil unmittelbar voraus. Bisher wird zur Vermeidung beispielsweise des Verdichterpumpens beim „Gas wegnehmen" der Ladedruck im System durch das Öffnen des sogenannten Schubumluftventils (Dump Valve) reduziert. Dadurch wird das Ladedruck führende Volumen auf näherungsweise Umgebungsdruck evakuiert. Die durch diese Maßnahme frei werdende pneumatische Energie wurde bisher nicht genutzt.City traffic a significant number of switch-on states is required. The electric auxiliary compressor must be accelerated to approx. 60,000 rpm with every full load acceleration. A mechanical rotational energy in the range of 400 to 500 watt seconds is absorbed, which must be made available by the electrical on-board system of the motor vehicle. The upshift during one The acceleration phase is usually preceded by a boost pressure reduction via a so-called air recirculation valve. So far, to avoid compressor pumping, for example, when “taking gas off”, the boost pressure in the system has been reduced by opening the so-called diverter valve (dump valve). As a result, the boost pressure-carrying volume is evacuated to approximately ambient pressure used.
In der erfindungsgemäßen Vorrichtung zur Verdichtung von Ladeluft sind Verbindungsmittel 52 vorhanden, die es ermöglichen, bereits verdichtete Ladeluft direkt in den Verdichterraum des elektrischen Ladeluftverdichters zu leiten, um damit ein schnelleres Hochlaufen des elektrischen Zusatzverdichters durch eine Vorbeschleunigung zu ermöglichen.In the device for compressing charge air according to the invention, connecting means 52 are provided, which make it possible to direct already compressed charge air directly into the compression space of the electric charge air compressor, in order to enable the additional electric compressor to start up more quickly by pre-acceleration.
Im Ausführungsbeispiel der erfindungsgemäßen Vorrichtung nach Figur 1 zweigen die Verbindungsmittel 52 von den Verbindungsmitteln 46, welche den Abgasturbolader mit dem Verbrennungsmotor verbinden, ab. Die Verbindungsmittel 52 führen über ein Ventil 54 direkt in den Verdichterraum 22 des elektrischen Zusatzverdichters 14. Dazu können beispielsweise, verteilt über den Umfang des Ringkanals 26 des elektrischen Zusatzverdichters 14, Öffnungen 56 vorgesehen sein, die die verdichtete und über die Verbindungsmittel 52 abgezweigte Ladeluft zielgerichtet in den Ringkanal 26 und anschließend auf die Verdichterschaufeln des Verdichterrades 24 leiten. Durch diese düsenförmige Einleitung der verdichteten Ladeluft auf die Verdichterschaufeln des Verdichterrades des elektrischen Zusatzverdichters ist eine Vorbeschleunigung des Zusatzverdichters möglich, die zu einem schnelleren Hochlaufen, das heißt zu einer kürzen Ansprechcharakteristik des Zusatzverdichters führt. Darüber hinaus bedeutet dieIn the exemplary embodiment of the device according to the invention according to FIG. 1, the connecting means 52 branch off from the connecting means 46, which connect the exhaust gas turbocharger to the internal combustion engine. The connecting means 52 lead via a valve 54 directly into the compressor chamber 22 of the additional electrical compressor 14. For this purpose, for example, distributed over the circumference of the annular channel 26 of the additional electrical compressor 14, openings 56 can be provided, which target the compressed and branched off via the connecting means 52 charge air lead into the ring channel 26 and then onto the compressor blades of the compressor wheel 24. This nozzle-shaped introduction of the compressed charge air onto the compressor blades of the compressor wheel of the electrical auxiliary compressor enables the auxiliary compressor to be pre-accelerated, which leads to faster startup, that is to say to a shorter response characteristic of the auxiliary compressor. In addition, it means
Nutzung der pneumatischen Energie des Ladeluftsystemes, dass eine reduzierte Energieaufnahme aus dem Bordnetz des Fahrzeuges beim Beschleunigen des elektrischen Zusatzverdichters möglich ist.Use of the pneumatic energy of the charge air system so that a reduced energy consumption from the vehicle's electrical system is possible when accelerating the electric auxiliary compressor.
Die Umlufteinleitstelle ist in vorteilhafter Weise direkt im elektrischen ZusatzverdichterThe air introduction point is advantageously directly in the additional electrical compressor
14 integriert und kann beispielsweise auch ein oder mehrere Ventile beinhalten, die ein Rückströmen der zu verdichtenden Ladeluft über die Verbindungsmittel 52 vermeidet. Darüber hinaus ist darauf zu achten, dass die durch den elektrischen Zusatzverdichter zu beschleunigende Ladeluft durch die Austrittsöffnung 28 des Zusatzverdichters abgeführt wird und somit dem nachgeschalteten Abgasturbolader 34 zugeführt werden kann. Ein Abströmen der durch den elektrischen Zusatzverdichter verdichteten Ladeluft über die Verbindungsmittel 52 gilt es zu unterbinden.14 integrated and can for example also include one or more valves, which avoids a backflow of the charge air to be compressed via the connecting means 52. In addition, care must be taken to ensure that the charge air to be accelerated by the additional electrical compressor is discharged through the outlet opening 28 of the additional compressor and can thus be supplied to the downstream exhaust gas turbocharger 34. On Flow of the charge air compressed by the additional electrical compressor via the connecting means 52 must be prevented.
In anderen Ausführungsformen kann vorgesehen sein, dass die Verbindungsmittel 52 ein Speichervolumen 58 umfassen, in das verdichtete Ladeluft geleitet und anschließend bei hohem Druck gespeichert werden kann. Beispielsweise durch eine Ventilanordnung kann dann zu einem gewünschten Zeitpunkt die verdichtete Ladeluft direkt in den Verdichterraum des elektrischen Zusatzverdichters abgegeben werden.In other embodiments, it can be provided that the connecting means 52 comprise a storage volume 58, into which compressed charge air is directed and then can be stored at high pressure. By means of a valve arrangement, for example, the compressed charge air can then be emitted directly into the compressor chamber of the additional electrical compressor at a desired point in time.
Mit der erfindungsgemäßen Vorrichtung ist eine sinnvolle Nutzung der pneumatischenWith the device according to the invention, a sensible use of the pneumatic
Ladeluftenergie bei negativen Lastwechseln des Verbrennungssystems möglich. Dem Hochschaltvorgang während einer Beschleunigungsphase geht in der Regel ein Ladedruckabbau über ein Umluftventil unmittelbar voraus und es erfolgt dann ein Wiederaufbau des Ladedruckes mit Unterstützung des elektrischen Zusatzverdichters. Der Ladedruckabbau kann durch die erfindungsgemäße Vorrichtung in vorteilhafterCharge air energy possible with negative load changes of the combustion system. The upshifting process during an acceleration phase is usually immediately preceded by a boost pressure reduction via a recirculation valve and then the boost pressure is rebuilt with the support of the additional electrical compressor. The charge pressure reduction can be advantageous by the device according to the invention
Weise zur Vorbeschleunigung des elektrischen Zusatzverdichters genutzt werden. Damit wird sowohl die notwendige Beschleunigungsenergie des elektrischen Zusatzverdichters, als auch dessen Ansprechzeit bis zum Erreichen seiner Maximaldrehzahl reduziert. Die pneumatische Energie des Ladeluftsystemes beinhaltet selbst bei Berücksichtigung eines moderaten Wirkungsgrades zur Übertragung seiner Energie auf den elektrischenBe used to pre-accelerate the additional electric compressor. This reduces both the necessary acceleration energy of the additional electric compressor and its response time until it reaches its maximum speed. The pneumatic energy of the charge air system includes even when considering a moderate efficiency to transfer its energy to the electrical
Zusatzverdichter einen nicht unwesentlichen Anteil der erforderlichen Rotationsenergie für einen elektrischen Zusatzverdichter.Additional compressor a not insignificant proportion of the rotational energy required for an additional electrical compressor.
Die erfindungsgemäße Vorrichtung ist nicht auf das in Figur 1 dargestellte Ausführungsbeispiel beschränkt.The device according to the invention is not limited to the exemplary embodiment shown in FIG. 1.
Insbesondere ist die erfindungsgemäße Vorrichtung nicht beschränkt auf die Verwendung eines elektrischen Zusatzverdichters und eines Abgasturboladers. In particular, the device according to the invention is not limited to the use of an additional electrical compressor and an exhaust gas turbocharger.

Claims

Ansprüche Expectations
1. Vorrichtung zur Verdichtung von Verbrennungsluft, insbesondere eine Vorrichtung zur Verdichtung von Ladeluft für eine kraftfahrzeugtechnische Verbrennungsmaschine, mit mindestens einem elektrisch betriebenen Ladeluftverdichter (14), der mindestens ein, in einem Verdichterraum (22) angeordnetes, von einem Elektromotor ( 18) angetriebenes Verdichterrad (24) aufweist, sowie mit einem zweiten, seriell zum elektrischen Ladeluftverdichter (14) geschalteten, weiteren Ladeluftverdichter (32), insbesondere einem Abgasturbolader (34), die über Verbindungsmittel (30) strömungstechnisch miteinander verbunden sind, dadurch gekennzeichnet, dass Verbindungsmittel (52) vorhanden sind, die es ermöglichen, verdichtete Ladeluft in den Verdichterraum (22) des elektrischen Ladeluftverdichters (14) einzuleiten.1. Device for compressing combustion air, in particular a device for compressing charge air for a motor vehicle internal combustion engine, with at least one electrically operated charge air compressor (14), which has at least one compressor wheel arranged in a compressor chamber (22) and driven by an electric motor (18) (24), as well as with a second, further charge air compressor (32), which is connected in series with the electric charge air compressor (14), in particular an exhaust gas turbocharger (34), which are fluidically connected to one another via connecting means (30), characterized in that connecting means (52 ) are present, which make it possible to introduce compressed charge air into the compressor chamber (22) of the electric charge air compressor (14).
2. Vorrichtung zur Verdichtung von Verbrennungsluft nach Anspruch 1, dadurch gekennzeichnet, dass die Verbindungsmittel (52) abstromseitig des zweiten Ladeluftverdichters (32, 34) abzweigen und in den Verdichterraum (22) des elektrischen Ladeluftverdichters (14) münden.2. Combustion air compression device according to claim 1, characterized in that the connecting means (52) branch off downstream of the second charge air compressor (32, 34) and open into the compressor chamber (22) of the electric charge air compressor (14).
3. Vorrichtung zur Verdichtung von Verbrennungsluft nach Anspruch 2, dadurch gekennzeichnet, dass die Verbindungsmittel (52) direkt in einen Ringkanal (26) des Gehäuses des elektrischen Ladeluftverdichters (14) münden.3. A device for compressing combustion air according to claim 2, characterized in that the connecting means (52) open directly into an annular channel (26) of the housing of the electric charge air compressor (14).
4. Vorrichtung zur Verdichtung von Verbrennungsluft nach Anspruch 3, dadurch gekennzeichnet, dass der Ringkanal (26) auf der Niederdruckseite des elektrischen Ladeluftverdichters (14) ausgebildet ist.4. A device for compressing combustion air according to claim 3, characterized in that the annular channel (26) is formed on the low pressure side of the electric charge air compressor (14).
5. Vorrichtung zur Verdichtung von Verbrennungsluft nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Verbindungsmittel (52) ein Ventil (54), insbesondere ein elektronisch ansteuerbares Membranventil, aufweisen. 5. Combustion air compression device according to one of the preceding claims, characterized in that the connecting means (52) have a valve (54), in particular an electronically controllable membrane valve.
6. Vorrichtung zur Verdichtung von Verbrennungsluft nach Anspruch 5, dadurch gekennzeichnet, dass das Ventil in ein Gehäuse des elektrischen Ladeluftverdichters (14) integriert ist.6. A device for compressing combustion air according to claim 5, characterized in that the valve is integrated in a housing of the electric charge air compressor (14).
7. Vorrichtung zur Verdichtung von Verbrennungsluft nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Verbindungsmittel (52) ein Speichervolumen (58) aufweisen. 7. Device for compressing combustion air according to one of the preceding claims, characterized in that the connecting means (52) have a storage volume (58).
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