DE102012219432A1 - Motor car, has combustion engine whose workspace is filled with compressed gas that is restored from compressed gas tank, and auxiliary unit fixed with compressed gas tank and operating bypass flap - Google Patents

Motor car, has combustion engine whose workspace is filled with compressed gas that is restored from compressed gas tank, and auxiliary unit fixed with compressed gas tank and operating bypass flap Download PDF

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Publication number
DE102012219432A1
DE102012219432A1 DE201210219432 DE102012219432A DE102012219432A1 DE 102012219432 A1 DE102012219432 A1 DE 102012219432A1 DE 201210219432 DE201210219432 DE 201210219432 DE 102012219432 A DE102012219432 A DE 102012219432A DE 102012219432 A1 DE102012219432 A1 DE 102012219432A1
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Prior art keywords
compressed gas
gas tank
combustion engine
motor vehicle
filled
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DE201210219432
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German (de)
Inventor
Hermann Sebastian Rottengruber
Christian Dönitz
Jens Adrian Röth
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Priority to DE201210219432 priority Critical patent/DE102012219432A1/en
Publication of DE102012219432A1 publication Critical patent/DE102012219432A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
    • B60T13/46—Vacuum systems
    • B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/08—Prime-movers comprising combustion engines and mechanical or fluid energy storing means
    • B60K6/12—Prime-movers comprising combustion engines and mechanical or fluid energy storing means by means of a chargeable fluidic accumulator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/04—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for starting by means of fluid pressure
    • 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
    • F02B21/00—Engines characterised by air-storage chambers
    • 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
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/08—Prime-movers comprising combustion engines and mechanical or fluid energy storing means
    • B60K6/12—Prime-movers comprising combustion engines and mechanical or fluid energy storing means by means of a chargeable fluidic accumulator
    • B60K2006/123—Prime-movers comprising combustion engines and mechanical or fluid energy storing means by means of a chargeable fluidic accumulator for driving pneumatic motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/30—Arrangements for supply of additional 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
    • F02B39/00—Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/04—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning exhaust conduits
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • 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
    • 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
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/62—Hybrid vehicles

Abstract

The car has a combustion engine whose workspace is filled with compressed gas that is restored from a compressed gas tank. An auxiliary unit e.g. brake booster, position element or steering support, is fixed with the compressed gas tank, and operates a bypass flap. An exhaust system and a supercharger are provided on the bypass flap.

Description

Die Erfindung betrifft ein Kraftfahrzeug mit einer Brennkraftmaschine mit einem Druckgastank mit den Merkmalen aus dem Oberbegriff des Patentanspruchs 1.The invention relates to a motor vehicle having an internal combustion engine with a compressed gas tank having the features of the preamble of patent claim 1.

Aus der PCT-Patentanmeldung mit der internationalen Veröffentlichungs-Nummer WO 2009/036992 A1 und der PCT-Patentanmeldung mit der internationalen Veröffentlichungs-Nummer WO 2011/015336 A1 ist jeweils eine Hubkolben-Brennkraftmaschine bekannt, bei der mindestens ein Zylinder, jedoch vorzugsweise alle Zylinder, über ein Ventil direkt mit einem Druckluftspeicher verbunden sind. Diese Ladeventile können derart angesteuert werden, dass sie während (vorzugsweise gegen Ende) einer Kompressionsphase des jeweiligen Zylinders geöffnet werden oder während einer Schubphase des Kraftfahrzeuges und damit den Drucktank füllen können. Mit Hilfe des gespeicherten Gases ist es nun durch Rückspeisung der Druckluft in den Zylinder möglich, beispielsweise ein sog. „Turboloch” zu überbrücken oder die Hubkolben-Brennkraftmaschine während einer Fahrt zu „boosten”, d. h. spontan mehr Kraft über die Kolben auf die Kurbelwelle zu übertragen, bzw. eine Starthilfe oder -unterstützung zu erzielen.From the PCT patent application with the International Publication Number WO 2009/036992 A1 and the PCT patent application with international publication number WO 2011/015336 A1 In each case, a reciprocating internal combustion engine is known in which at least one cylinder, but preferably all cylinders are connected via a valve directly to a compressed air reservoir. These charging valves can be controlled such that they can be opened during (preferably towards the end) a compression phase of the respective cylinder or during a coasting phase of the motor vehicle and thus can fill the pressure tank. With the help of the stored gas, it is now possible by feeding back the compressed air into the cylinder, for example to bridge a so-called "turbo lag" or to "boost" the reciprocating internal combustion engine during a drive, ie more spontaneously more force via the pistons to the crankshaft transfer or to obtain a jump start or support.

Weiter ist aus der Übersetzung der europäischen Patentschrift DE 60 2005 002 267 T2 , von der die vorliegende Erfindung ausgeht, ein Verfahren zum Betreiben einer Brennkraftmaschine bekannt. Die Brennkraftmaschine weist einen Zylinder auf mit einem in dem Zylinder hin- und hergehenden Kolben. Weiter weist der Zylinder eine erste und eine zweite Einlassöffnung auf zum Ansaugen von Gas von einer Umgebungsluftquelle, mit einem ersten und einem zweiten Einlassventil, die jeweils zwischen einer jeweiligen Einlassöffnung und dem Zylinder angeordnet sind, mit einem Rückschlagventil, welches in der zweiten der Einlassöffnung in einem Abstand vom zweiten Einlassventil angeordnet ist und so ausgerichtet ist, dass das Gas nur zum Zylinder hin strömt. Weiter weist die Brennkraftmaschine ein verstellbares Ventilbetätigungssystem zur Steuerung der Öffnung und Schließung wenigstens des zweiten Einlassventils auf.Next is from the translation of the European patent specification DE 60 2005 002 267 T2 , from which the present invention proceeds, a method for operating an internal combustion engine known. The internal combustion engine has a cylinder with a piston reciprocating in the cylinder. Further, the cylinder has first and second inlet ports for drawing gas from an ambient air source, with first and second inlet valves respectively disposed between a respective inlet port and the cylinder, with a check valve provided in the second of the inlet port in FIG is arranged at a distance from the second inlet valve and is oriented so that the gas flows only to the cylinder. Furthermore, the internal combustion engine has an adjustable valve actuation system for controlling the opening and closing of at least the second inlet valve.

Das vorgeschlagene Verfahren ist dadurch gekennzeichnet, dass in wenigstens einer Betriebsart der Brennkraftmaschine das zweite Einlassventil geöffnet und geschlossen wird, wenn der Zylinder vollkommen von der Umgebungsluft abgeschlossen ist, um so einen Gastransfer zwischen dem Zylinder und einer Nebenkammer zu ermöglichen, die vorübergehend von einem Teil der zweiten Einlassöffnung gebildet wird, der zwischen dem zweiten Einlassventil und dem Rückschlagventil liegt, wobei das zweite Einlassventil zu einem Zeitpunkt geöffnet wird, wenn der Druck in der Nebenkammer größer als der Umgebungsluftdruck ist, so dass kein Gas über das Rückschlagventil abströmen kann.The proposed method is characterized in that in at least one mode of operation of the internal combustion engine, the second intake valve is opened and closed when the cylinder is completely shut off from the ambient air so as to allow gas transfer between the cylinder and a sub-chamber temporarily from a part the second inlet port is formed, which is between the second inlet valve and the check valve, wherein the second inlet valve is opened at a time when the pressure in the auxiliary chamber is greater than the ambient air pressure, so that no gas can flow through the check valve.

Die derart gespeicherte Druckluft kann dann später in dem Hybridmotor auf mehrere Arten und Weisen wieder verwendet werden, z. B. zum Anlassen und Neustarten der Brennkraftmaschine im Start-Stopp-Betrieb, zur Erhöhung der Leistung der Brennkraftmaschine durch einen schnellen Stoß von Druckluft in den Zylinder bei der Beschleunigung, um die durch den Abgas-Turbolader bedingte Ansprechzeit (Turboloch) zu verkürzen, zur Einspritzung von Sekundärluft in die Abgasanlage der Brennkraftmaschine zur schnellen Erreichung der Betriebstemperatur des Katalysators und Regenerierung einer Partikelfalle und zum Antrieb der Brennkraftmaschine unter bestimmten Fahrbedingungen mit konstanter Geschwindigkeit.The thus stored compressed air can then be used later in the hybrid engine in several ways, for. As for starting and restarting the engine in the start-stop operation, to increase the performance of the internal combustion engine by a rapid impact of compressed air into the cylinder during acceleration to shorten the conditional by the exhaust gas turbocharger response time (turbo lag) Injection of secondary air into the exhaust system of the internal combustion engine for rapid achievement of the operating temperature of the catalyst and regeneration of a particulate trap and for driving the internal combustion engine under certain driving conditions at a constant speed.

Auch wenn der bisher bekannte Stand der Technik keinen prinzipiellen Nachteil aufweist, liegt der Erfindung die Aufgabe zugrunde, das Druckgas im Druckgastank für weitere Aufgaben zu nutzen, um Kraftstoff einzusparen bzw. die CO2-Emissionen zu reduzieren.Although the hitherto known prior art has no fundamental disadvantage, the object of the invention is to utilize the compressed gas in the compressed gas tank for further tasks in order to save fuel or to reduce CO 2 emissions.

Diese Aufgabe wird durch das Merkmal im kennzeichnenden Teil des Patentanspruchs 1 gelöst. Durch den erfindungsgemäßen Einsatz des Druckgastanks kann beispielsweise eine Unterdruckpumpe entfallen.This object is achieved by the feature in the characterizing part of patent claim 1. By using the compressed gas tank according to the invention, for example, a vacuum pump can be dispensed with.

Bevorzugt sind die Nebenaggregate gemäß den Patentansprüche 2, 3 und 5 ein Bremskraftverstärker oder ein Stellelement zur Betätigung einer Klappe oder eine Lenkungsunterstützung.Preferably, the ancillaries according to claims 2, 3 and 5, a brake booster or an actuator for actuating a flap or a steering assistance.

Die Klappe ist gemäß Patentanspruch 4 bevorzugt für eine Abgasanlage oder beispielsweise für eine Bypassklappe in einem Abgasturbolader vorgesehen.The flap is preferably provided according to claim 4 for an exhaust system or for example for a bypass valve in an exhaust gas turbocharger.

Durch die erfindungsgemäße Ausgestaltung kann beispielsweise ein Bremskraftverstärker in seiner Bauform kleiner ausgelegt werden, da ein höheres Druckniveau, üblicherweise 6 bis 12 bar, anliegt als bei der Verwendung einer Unterdruckpumpe. Darüber hinaus können auch ein Aktuator für eine Lenkungsunterstützung oder zur Betätigung einer Klappe verkleinert werden. Diese Vorteile führen zur Entlastung des elektrischen Bordnetzes des Kraftfahrzeuges, wodurch Kraftstoff eingespart und die CO2-Emissionen gesenkt werden.Due to the embodiment of the invention, for example, a brake booster in its design can be made smaller, since a higher pressure level, usually 6 to 12 bar, applied, as in the use of a vacuum pump. In addition, an actuator for a steering assistance or for operating a flap can be reduced. These advantages lead to the discharge of the electrical system of the motor vehicle, which saves fuel and CO 2 emissions are reduced.

Ein weiterer Vorteil der Erfindung ergibt sich daraus, dass es in zukünftigen Emissionsrichtlinien auch darauf ankommen wird, welche Emissionen das Kraftfahrzeug außerhalb der Betriebspunkte des neuen europäischen Fahrzyklus (NEFZ) verursacht, also auch bei maximaler Leistungsabgabe der Brennkraftmaschine. Dort wird derzeit aus Gründen des Bauteilschutzes üblicherweise angefettet (Verbrennung mit einem Kraftstoffüberschuss, λ < 1), was eine schlechte Emissionsbilanz im Fall hoher Leistungen zur Folge hat. Mit zusätzlich eingebrachter Luft in den Abgasstrang kann durch Nachreaktionen das Lambda wieder auf 1 korrigiert und somit die Emissionsvorschriften eingehalten werden. Dies kann speziell bei motornahen Katalysatorsystemen dazu führen, dass der Katalysator zu heiß wird. Die bereits bekannte Lufteinblasung in den Abgasstrang kann also dann Verwendung finden, wenn sich der Katalysator weit genug entfernt von der Brennkraftmaschine befindet. Das Heizen des Katalysators während der Startphase könnte dann beispielsweise im Gegensatz zum Stand der Technik elektrisch erfolgen.Another advantage of the invention results from the fact that it will also be important in future emission guidelines which emissions the motor vehicle causes outside the operating points of the new European driving cycle (NEDC), ie even at maximum power output of the internal combustion engine. There is currently for reasons of component protection usually enriched (combustion with a fuel surplus, λ <1), which has a poor emissions balance in the case of high performance result. With additionally introduced air into the exhaust system, the lambda can be corrected to 1 again by subsequent reactions and thus the emission regulations can be adhered to. This can lead to the catalyst becoming too hot, especially in catalyst systems close to the engine. The already known air injection into the exhaust system can therefore be used when the catalyst is far enough away from the internal combustion engine. The heating of the catalyst during the starting phase could then take place electrically, for example, in contrast to the prior art.

Die Erfindung betrifft somit ein Kraftfahrzeug mit einer Brennkraftmaschine mit einem Druckgastank, der von zumindest einem Arbeitsraum der Brennkraftmaschine mit komprimiertem Gas befüllbar ist, wobei das komprimierte Gas aus dem Druckgastank in den zumindest einen Arbeitsraum rückführbar ist. Erfindungsgemäß ist das Kraftfahrzeug dadurch gekennzeichnet, dass ein Nebenaggregat des Kraftfahrzeuges mit dem komprimierten Gas aus dem Druckgastank beaufschlagbar ist.The invention thus relates to a motor vehicle having an internal combustion engine with a compressed gas tank which can be filled with compressed gas from at least one working chamber of the internal combustion engine, wherein the compressed gas from the compressed gas tank can be returned to the at least one working chamber. According to the invention, the motor vehicle is characterized in that an accessory of the motor vehicle with the compressed gas from the compressed gas tank can be acted upon.

In einer ersten Ausführungsvariante ist das Nebenaggregat ein Bremskraftverstärker. In einer weiteren Ausführungsvariante ist das Nebenaggregat ein Stellelement zur Betätigung einer Klappe, insbesondere einer Abgasklappe oder einer Klappe für einen Abgasturbolader. In einem weiteren Ausführungsbeispiel kann das Nebenaggregat auch eine Lenkungsunterstützung sein.In a first embodiment variant, the auxiliary unit is a brake booster. In a further embodiment, the auxiliary unit is an actuating element for actuating a flap, in particular an exhaust flap or a flap for an exhaust gas turbocharger. In a further embodiment, the accessory may also be a steering assistance.

Aufgrund des höheren Druckniveaus in dem Druckgastank, der üblicherweise zwischen 6 und 12 bar liegt, können die Aktuatoren, bzw. Nebenaggregate deutlich kleiner ausgeführt werden. Somit kann gegenüber dem Stand der Technik in vorteilhafter Weise beispielsweise eine Unterdruckpumpe entfallen. Darüber hinaus sind aufgrund des höheren Druckniveaus die Verkleinerung des Bremskraftverstärkers möglich sowie die Verkleinerung einer Lenkungsunterstützung. Durch die erfindungsgemäße Ausgestaltung wird durch den Entfall einer elektrischen Unterdruckpumpe das elektrische Bordnetz des Kraftfahrzeuges entlastet. Dies führt in vorteilhafter Weise zur Einsparung von Kraftstoff bzw. zu geringeren CO2-Emissionen.Due to the higher pressure levels in the compressed gas tank, which is usually between 6 and 12 bar, the actuators or ancillaries can be made significantly smaller. Thus, in comparison with the prior art, for example, a vacuum pump can advantageously be dispensed with. In addition, due to the higher pressure levels, the reduction of the brake booster and the reduction of a steering assistance. The inventive design is relieved by the elimination of an electric vacuum pump, the electrical system of the motor vehicle. This leads advantageously to the saving of fuel or to lower CO 2 emissions.

Ein weiterer Vorteil der Erfindung ergibt sich daraus, dass es in zukünftigen Emissionsrichtlinien auch darauf ankommen wird, welche Emissionen das Kraftfahrzeug außerhalb der Betriebspunkte des neuen europäischen Fahrzyklus (NEFZ) verursacht, also auch bei maximaler Leistungsabgabe der Brennkraftmaschine. Dort wird derzeit aus Gründen des Bauteilschutzes üblicherweise angefettet (Kraftstoffüberschuss, λ < 1), was eine schlechte Emissionsbilanz im Fall hoher Leistungen zur Folge hat. Mit zusätzlich eingebrachter Luft in den Abgasstrang kann durch Nachreaktionen das Lambda wieder auf 1 korrigiert und somit die Emissionsvorschriften eingehalten werden. Dies kann speziell bei motornahen Katalysatorsystemen dazu führen, dass der Katalysator zu heiß wird. Die bereits bekannte Lufteinblasung in den Abgasstrang kann also dann Verwendung finden, wenn sich der Katalysator weit genug entfernt von der Brennkraftmaschine befindet. Das Heizen des Katalysators während der Startphase könnte dann beispielsweise im Gegensatz zum Stand der Technik elektrisch erfolgen.Another advantage of the invention results from the fact that in future emission guidelines it will also depend on which emissions the motor vehicle causes outside the operating points of the new European driving cycle (NEDC), thus also at maximum power output of the internal combustion engine. There is currently for reasons of component protection usually enriched (fuel surplus, λ <1), which has a poor emissions balance in the case of high performance result. With additionally introduced air into the exhaust gas system, the lambda can be corrected to 1 again by means of post-reactions and thus the emission regulations can be adhered to. This can lead to the catalyst becoming too hot, especially in catalyst systems close to the engine. The already known air injection into the exhaust gas line can therefore be used when the catalyst is far enough away from the internal combustion engine. The heating of the catalyst during the starting phase could then take place electrically, for example, in contrast to the prior art.

ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION

Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Zitierte PatentliteraturCited patent literature

  • WO 2009/036992 A1 [0002] WO 2009/036992 A1 [0002]
  • WO 2011/015336 A1 [0002] WO 2011/015336 A1 [0002]
  • DE 602005002267 T2 [0003] DE 602005002267 T2 [0003]

Claims (5)

Kraftfahrzeug mit einer Brennkraftmaschine mit einem Druckgastank, der von zumindest einem Arbeitsraum der Brennkraftmaschine mit komprimiertem Gas befüllbar ist, wobei das komprimierte Gas aus dem Druckgastank in den zumindest einen Arbeitsraum rückführbar ist, dadurch gekennzeichnet, dass ein Nebenaggregat des Kraftfahrzeuges mit dem komprimierten Gas aus dem Druckgastank beaufschlagbar ist.Motor vehicle with an internal combustion engine with a compressed gas tank, which is filled from at least one working space of the internal combustion engine with compressed gas, wherein the compressed gas from the compressed gas tank in the at least one working space is traceable, characterized in that an accessory of the motor vehicle with the compressed gas from the Pressurized gas tank can be acted upon. Kraftfahrzeug nach Patentanspruch 1, dadurch gekennzeichnet, dass das Nebenaggregat ein Bremskraftverstärker ist.Motor vehicle according to claim 1, characterized in that the auxiliary unit is a brake booster. Kraftfahrzeug nach Patentanspruch 1, dadurch gekennzeichnet, dass das Nebenaggregat ein Stellelement zur Betätigung einer Klappe ist.Motor vehicle according to claim 1, characterized in that the accessory is an actuating element for actuating a flap. Kraftfahrzeug nach Patentanspruch 3, dadurch gekennzeichnet, dass die Klappe für eine Abgasanlage oder einen Abgasturbolader vorgesehen ist.Motor vehicle according to claim 3, characterized in that the flap is provided for an exhaust system or an exhaust gas turbocharger. Kraftfahrzeug nach Patentanspruch 1, dadurch gekennzeichnet, dass das Nebenaggregat eine Lenkungsunterstützung ist.Motor vehicle according to claim 1, characterized in that the accessory is a steering assistance.
DE201210219432 2012-10-24 2012-10-24 Motor car, has combustion engine whose workspace is filled with compressed gas that is restored from compressed gas tank, and auxiliary unit fixed with compressed gas tank and operating bypass flap Withdrawn DE102012219432A1 (en)

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EP2848438A1 (en) * 2013-08-12 2015-03-18 Bayerische Motoren Werke Aktiengesellschaft Air suspension device for a vehicle with a combustion engine
FR3023817A1 (en) * 2014-07-17 2016-01-22 Chassis Brakes Int Bv BRAKING SYSTEM FOR HYDRAULIC HYBRID VEHICLE

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DE10221269A1 (en) * 2002-05-14 2003-11-27 Antoni Slawomir Stys Device on brake system of IC engines to recover secondary energy during braking process, store it in accumulator, and use compressed air energy as vehicle fuel
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2848438A1 (en) * 2013-08-12 2015-03-18 Bayerische Motoren Werke Aktiengesellschaft Air suspension device for a vehicle with a combustion engine
FR3023817A1 (en) * 2014-07-17 2016-01-22 Chassis Brakes Int Bv BRAKING SYSTEM FOR HYDRAULIC HYBRID VEHICLE

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