WO1995028558A2 - Method and device for operating a diesel engine - Google Patents

Method and device for operating a diesel engine Download PDF

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Publication number
WO1995028558A2
WO1995028558A2 PCT/EP1995/001390 EP9501390W WO9528558A2 WO 1995028558 A2 WO1995028558 A2 WO 1995028558A2 EP 9501390 W EP9501390 W EP 9501390W WO 9528558 A2 WO9528558 A2 WO 9528558A2
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WO
WIPO (PCT)
Prior art keywords
exhaust gas
water
diesel oil
air intake
intake pipe
Prior art date
Application number
PCT/EP1995/001390
Other languages
German (de)
French (fr)
Other versions
WO1995028558A3 (en
Inventor
Alfred Kessler
Original Assignee
KESSLER-MÜLLER, Evelin
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 KESSLER-MÜLLER, Evelin filed Critical KESSLER-MÜLLER, Evelin
Priority to AU22577/95A priority Critical patent/AU2257795A/en
Publication of WO1995028558A2 publication Critical patent/WO1995028558A2/en
Publication of WO1995028558A3 publication Critical patent/WO1995028558A3/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
    • F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
    • F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/022—Adding fuel and water emulsion, water or steam
    • F02M25/0228—Adding fuel and water emulsion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
    • F02M26/19—Means for improving the mixing of air and recirculated exhaust gases, e.g. venturis or multiple openings to the intake system
    • 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
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • 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 method for operating a diesel engine, to which a water-in-diesel oil emulsion with a water content which is variable as a function of the engine speed and the load condition of the engine is fed.
  • the invention further relates to a device for operating a diesel engine, which has an exhaust pipe, an air intake pipe and an injection pump, which in one
  • Recirculation circuit is connected upstream of a mixing device for mixing water with diesel oil to form a water-in-diesel oil emulsion, into which a diesel oil supply line and a water supply line open via a controllable water injection nozzle, the water injection nozzle being supplied by an electronic control unit for changing the water content in the emulsion is controlled depending on the load state and / or the speed of the diesel engine.
  • Such a method and such a device are known from EP-A-0392545.
  • a water-in-diesel oil emulsion By using a water-in-diesel oil emulsion, the proportion of nitrogen oxide and soot in the exhaust gas can be reduced with increasing water content in the emulsion.
  • the hydrocarbon (HC) and carbon monoxide (CO) components increase with increasing water content in the emulsion.
  • the water content in the emulsion is reduced to low engine speeds and load conditions and when idling, water-free diesel oil is used.
  • this in turn can increase the nitrogen oxide content in the exhaust gas.
  • the invention solves the problem of how a reduction in the nitrogen oxide content can be achieved even with little or no water content in the emulsion.
  • EPSATZBLArr (RULE 26) is controlled and the recirculated exhaust gas fraction is optionally controlled in proportion to the water fraction and / or the oxygen fraction in the exhaust gas.
  • the exhaust gas recirculation controlled according to the invention in particular proportional to the oxygen content in the exhaust gas, an effective reduction of the nitrogen oxide content in the exhaust gas can also be achieved in the low load range and at low engine speeds.
  • the exhaust gas recirculation leads to an additional reduction in the nitrogen oxide content even at higher load conditions and speeds.
  • the combination of exhaust gas recirculation with the operation of the diesel engine with a water-in-diesel oil emulsion avoids increased soot formation, which was inevitable when using exhaust gas recirculation in the conventional operation of diesel engines with pure diesel oil, especially under higher load conditions.
  • the exhaust gas proportion is optionally controlled in proportion to the air flow in the air intake pipe.
  • the air flow in the air intake pipe is first accelerated and then decelerated by a nozzle-like constriction and a subsequent sudden expansion, and the exhaust gas in the air intake pipe in height the extension is introduced tangentially.
  • a preferred device of the type mentioned at the outset for carrying out the method according to the invention is characterized in particular in that an exhaust gas recirculation line is branched off from the exhaust line to the air intake pipe and is controlled by a controllable throughput control valve which is controlled by the electronic control unit, to which an actual value transmitter is sent Water flow sensor in the
  • ERS ⁇ ZBL ⁇ T (RULE 26) Water supply line, a diesel oil flow sensor in the diesel oil supply line, an engine speed sensor and an oxygen sensor arranged in the exhaust line are connected. In this way, not only the water content in the emulsion, but also the amount of the returned exhaust gas can be optimally controlled by the electronic control unit according to predetermined control characteristics.
  • an air flow sensor arranged in the air intake pipe upstream of the point at which the exhaust gas is introduced into the air intake pipe can be connected to the electronic control unit as an additional actual value transmitter.
  • FIG. 5 is a schematic view of a flange for exhaust gas recirculation installed in the air intake pipe of the diesel engine
  • FIG. 6 shows the section of the flange along the section line Z-Z in FIG. 5.
  • ERS ⁇ ZBL ⁇ TT (REGEL26) Device according to the invention for operating a diesel engine explained either with pure diesel oil or with a water-in-diesel oil emulsion.
  • the injection pump 1 of the diesel engine is connected to a common recirculation circuit 2 to 5 with a mixing device 6, in which the emulsion is generated.
  • a diesel oil supply line 8 opens into the mixing device 6 and a water supply line 7 via an intermittently operated, controlled water injection valve 27.
  • the water injection valve 27, which is only shown schematically, is controlled by an electronic control unit 23, by which the injected water quantity per unit of time, and thus the water content in the emulsion , depending on the diesel oil flow rate, which is measured with a diesel oil flow rate sensor 25 connected to the diesel oil line, and the speed of the engine.
  • an electronic control unit 23 controls the injected water quantity per unit of time, and thus the water content in the emulsion , depending on the diesel oil flow rate, which is measured with a diesel oil flow rate sensor 25 connected to the diesel oil line, and the speed of the engine.
  • a first solenoid valve 10 designed as a three-way valve and controlled by an electronic control unit 22, is switched on, from which the flow passage either from the mixing device 6 or from one
  • Bypass line 9 which branches off from the diesel oil supply line 8, is released to the recirculation branch leading to the injection pump 1.
  • a common displaceable partition formed as an elastic membrane formed as an elastic membrane.
  • Injection pump 1 to the mixing chamber 6 is a second controlled solenoid valve 24, designed as a four-way valve, from which the return 4 controlled by the injection pump 1 can optionally be switched to the return line to the mixing device 6, to the emulsion storage space 12 or to the diesel oil storage space 13.
  • the return line 4 between the second solenoid valve 11 and the injection pump 1 are designed as a three-way valve
  • the return line 4 can be directed, controlled by the injection pump, either into the pump 17 or into the bypass line 20, which opens again into the return branch 4, 5 of the recirculation circuit between the pump 17 and the second solenoid valve 11.
  • a third solenoid valve 14 and a fourth solenoid valve 15 are switched on, each of which is designed as a three-way valve and with which the emulsion storage space 12 or the diesel oil storage space can be switched to the feed to the injection pump 1 in a controlled manner.
  • These solenoid valves 14, 15 should be arranged as close as possible to one another and as close as possible to the inlet of the injection pump.
  • a sixth solenoid valve 24 designed as a three-way valve is switched, with which the line 5 can be selectively switched to the mixing device 6 or to the diesel oil tank.
  • a water flow sensor 21 is also switched on in the water supply line. If the water flow sensor 21 in the emulsion mode of operation does not measure suitable water flow rates to predetermined target values that are stored in the electronic control unit, then a command for reducing the stroke of the control rod of the injection pump 1 is generated by means of a lifting magnet and, if necessary, the further water supply Mixing chamber 6 switched off.
  • Fig. 1 indicates the state in the emulsion mode at full load of the diesel engine.
  • the emulsion generated in the mixing device 6 is fed to the injection pump 1 with appropriately controlled solenoid valves, the return flow of which is fed back into the mixing device 6.
  • the pump 17 is switched off and is bypassed by the recirculate.
  • the emulsion storage space 13 is empty and the diesel oil storage space is filled with pure diesel oil.
  • a predetermined value for example, a rotational speed of 800 to 900 min "1 and a load of about 10%
  • the first solenoid valve 10 switches from the mixing device to the bypass line 9 and thus to pure diesel oil supply
  • the third solenoid valve 14 opens the diesel oil storage space 13 to the injection pump 6
  • Return line 4 is switched from the fifth solenoid valve 19 to the pressure pump 17 and this is switched on.
  • the second solenoid valve 11 is switched to the emulsion storage space 12. The emulsion residue in the injection pump is sucked off by the pump 17 and via the second
  • Solenoid valve 11 pressed into the emulsion storage space.
  • the latter is filled with residual emulsion and the diesel oil from the diesel oil storage space 13 is displaced into the injection pump 1 and this is thereby flushed with pure diesel oil.
  • the pump 17 is switched off under the automatic control by the electronic control unit 22 and the second 11, the third 14 and the fifth 19 solenoid valve switched back to the switching position according to FIG. 1, whereas the first solenoid valve on the bypass line 9, ie remains switched to pure diesel oil supply.
  • Diesel oil mode of operation and the associated switching positions of the solenoid valves are shown in FIG. 3. 2 to 3 minutes after the idling state has been reached, the return flow from the injection pump 1 is switched from the sixth solenoid valve 24 to the diesel oil tank.
  • Diesel oil mode of operation on the emulsion mode of operation and the position of the solenoid valves can be seen from FIG. 4.
  • the first solenoid valve 10 and the sixth solenoid valve 24 are switched back to the mixing device 6 and after a short period of time, e.g. 3 s, the switching states of the solenoid valves from FIG. 1 are reached again.
  • part of the exhaust gas is also returned to the air intake pipe 30 of the diesel engine shown schematically in FIGS. 1 to 4.
  • an exhaust gas return line 32 leading to the air intake pipe 30 branches off from the exhaust line 31 of the diesel engine, into which a controllable throughput control valve 33 is switched on, which is controlled by the electronic control unit 22.
  • an oxygen sensor 34 is installed in the exhaust line 31, which is preferably designed as a zirconium dioxide sensor like the lambda probe known for gasoline engines with a catalyst and is connected to the electronic control unit 22 as an actual value transmitter
  • the electronic control unit 22 also controls the throughput control valve 33 with which the recirculated exhaust gas quantity is set. This takes place according to predetermined characteristic maps, which are stored as setpoints in the electronic control unit 22, in the lower load range and at idle, where the water content in the emulsion is low or is missing in the diesel oil, mainly on the basis of those measured by the oxygen sensor 34
  • Figures 5 and 6 show a flange which in the
  • Air intake pipe 30 is turned on.
  • the direction of flow of the intake air is indicated by an arrow in FIG. 6.
  • the flange forms a nozzle-like cross-sectional constriction 35 of the flow cross-section, which is followed by a stepped cross-sectional widening 36, on which the
  • Embodiment four exhaust gas recirculation channels 37 open tangentially, which are connected to the exhaust gas recirculation line 32.
  • the device according to the invention for operating a diesel engine preferably has the structure shown in FIGS. 1 to 4, it can also be used expediently in other systems, in particular also in those in which the emulsion storage space 12 and the diesel oil storage space 13 for the Transition between the pure diesel mode and the emulsion mode is not used.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

A method and device are disclosed for operating a diesel engine which is fed with a diesel/water emulsion in which the proportion of water is altered in accordance with the engine speed and load. To achieve further reductions in the concentration of nitrogen monoxide in the exhaust gas, exhaust gas from the diesel engine is fed back into the air intake; the proportion of exhaust gas thus fed back is adjusted in accordance with the water concentration and/or oxygen concentration in the exhaust gas, as required.

Description

Verfahren und Einrichtung zum Betreiben eines Dieselmotors Method and device for operating a diesel engine
Die Erfindung betrifft ein Verfahren zum Betreiben eines Dieselmotors, dem eine Wasser-in-Dieselöl-Emulsion mit in Abhängigkeit von der Motordrehzahl und dem Lastzustand des Motors veränderlichem Wasseranteil zugeführt wird.The invention relates to a method for operating a diesel engine, to which a water-in-diesel oil emulsion with a water content which is variable as a function of the engine speed and the load condition of the engine is fed.
Weiter betrifft die Erfindung eine Einrichtung zum Betreiben eines Dieselmotors, der eine Abgasleitung, ein Luftansaugrohr und eine Einspritzpumpe aufweist, der in einemThe invention further relates to a device for operating a diesel engine, which has an exhaust pipe, an air intake pipe and an injection pump, which in one
Rezirkulationskreis eine zum Vermischen von Wasser mit Dieselöl zu einer Wasser-in-Dieselöl-Emulsion dienende Mischvorrichtung vorgeschaltet ist, in die eine Dieselölzuleitung und über eine steuerbare Wassereinspritzdüse eine Wasserzuleitung münden, wobei die Wassereinspritzdüse von einer elektronischen Regeleinheit für eine Änderung des Wasseranteils in der Emulsion in Abhängigkeit von dem Lastzustand und/oder der Drehzahl des Dieselmotors gesteuert ist.Recirculation circuit is connected upstream of a mixing device for mixing water with diesel oil to form a water-in-diesel oil emulsion, into which a diesel oil supply line and a water supply line open via a controllable water injection nozzle, the water injection nozzle being supplied by an electronic control unit for changing the water content in the emulsion is controlled depending on the load state and / or the speed of the diesel engine.
Ein derartiges Verfahren und eine derartige Einrichtung sind aus der EP-A-0392545 bekannt. Durch die Verwendung einer Wasser-in-Dieselöl-Emulsion können mit zunehmendem Wasseranteil in der Emulsion die Stickoxid- und Rußanteile im Abgas zunehmend vermindert werden. Insbesondere im niedrigen Lastbereich und im Leerlauf des Dieselmotors nehmen jedoch die Kohlenwasserstoff (HC)-Anteile und Kohlenmonoxid (CO)-Anteile mit zunehmendem Wasseranteil in der Emulsion zu. Daher wird der Wasseranteil in der Emulsion zu niedrigen Drehzahlen und Lastzuständen hin reduziert und im Leerlauf wird mit wasserfreiem Dieselöl gefahren. Dadurch können aber ihrerseits die Stickoxidanteile im Abgas zunehmen.Such a method and such a device are known from EP-A-0392545. By using a water-in-diesel oil emulsion, the proportion of nitrogen oxide and soot in the exhaust gas can be reduced with increasing water content in the emulsion. However, especially in the low load range and when the diesel engine is idling, the hydrocarbon (HC) and carbon monoxide (CO) components increase with increasing water content in the emulsion. For this reason, the water content in the emulsion is reduced to low engine speeds and load conditions and when idling, water-free diesel oil is used. However, this in turn can increase the nitrogen oxide content in the exhaust gas.
Durch die Erfindung wird das Problem gelöst, wie auch bei geringem oder fehlendem Wasseranteil in der Emulsion eine Reduzierung der Stickoxidanteile erzielt werden kann.The invention solves the problem of how a reduction in the nitrogen oxide content can be achieved even with little or no water content in the emulsion.
Dies wird gemäß der Erfindung dadurch erreicht, daß in das Luftansaugrohr des Dieselmotors Abgas desselben zurückgeführtThis is achieved according to the invention in that exhaust gas of the same is returned to the air intake pipe of the diesel engine
EPSATZBLArr(REGEL26) wird und der zurückgeführte Abgasanteil gesteuert wahlweise proportional zu dem Wasseranteil und/oder zu dem Sauerstoffanteil im Abgas verändert wird.EPSATZBLArr (RULE 26) is controlled and the recirculated exhaust gas fraction is optionally controlled in proportion to the water fraction and / or the oxygen fraction in the exhaust gas.
Durch die erfindungsgemäß gesteuerte Abgasrückführung insbesondere proportional zu dem Sauerstoffanteil im Abgas kann eine wirksame Reduzierung der Stickoxidanteile im Abgas auch im niedrigen Lastbereich und bei niedrigen Drehzahlen erreicht werden. Jedoch führt die Erfindung durch die Abgasrückführung auch bei höheren Lastzuständen und Drehzahlen zu einer zusätzlichen Reduzierung der Stickoxidanteile. Gleichzeitig wird durch die Kombination der Abgasrückführung mit dem Betrieb des Dieselmotors mit einer Wasser-in-Dieselöl-Emulsion eine erhöhte Rußbildung vermieden, die bei der Verwendung der Abgasrückführung beim herkömmlichen Betrieb von Dieselmotoren mit reinem Dieselöl besonders bei höheren Lastzuständen unvermeidlich war.Due to the exhaust gas recirculation controlled according to the invention, in particular proportional to the oxygen content in the exhaust gas, an effective reduction of the nitrogen oxide content in the exhaust gas can also be achieved in the low load range and at low engine speeds. However, the exhaust gas recirculation leads to an additional reduction in the nitrogen oxide content even at higher load conditions and speeds. At the same time, the combination of exhaust gas recirculation with the operation of the diesel engine with a water-in-diesel oil emulsion avoids increased soot formation, which was inevitable when using exhaust gas recirculation in the conventional operation of diesel engines with pure diesel oil, especially under higher load conditions.
Die Wirksamkeit des erfindungsgemäßen Verfahrens kann zusätzlich verbessert werden, wenn der zurückgeführteThe effectiveness of the method according to the invention can be further improved if the recycled
Abgasanteil gesteuert wahlweise zusätzlich proportional zu dem Luftdurchsatz im Luftansaugrohr verändert wird.The exhaust gas proportion is optionally controlled in proportion to the air flow in the air intake pipe.
Um eine möglichst gute Durchmischung der Ansaugluft mit dem zurückgeführten Abgas zu erreichen, wird es weiter vorgezogen, wenn der Luftstrom im Luftansaugrohr durch eine düsenartige Verengung und eine sich daran anschließende plötzliche Erweiterung zunächst beschleunigt und dann wieder verzögert wird und das Abgas in das Luftansaugrohr in Höhe der Erweiterung tangential eingeführt wird.In order to achieve the best possible mixing of the intake air with the recirculated exhaust gas, it is further preferred if the air flow in the air intake pipe is first accelerated and then decelerated by a nozzle-like constriction and a subsequent sudden expansion, and the exhaust gas in the air intake pipe in height the extension is introduced tangentially.
Eine bevorzugte Einrichtung der eingangs erwähnten Art zur Durchführung des erfindungsgemäßen Verfahrens ist insbesondere dadurch gekennzeichnet, daß von der Abgasleitung zu dem Luftansaugrohr eine Abgasrückführleitung abgezweigt ist, die von einem steuerbaren Durchsatzsteuerventil beherrscht wird, das von der elektronischen Regeleinheit gesteuert ist, an welche als Istwertgeber ein Wasserdurchsatzfühler in derA preferred device of the type mentioned at the outset for carrying out the method according to the invention is characterized in particular in that an exhaust gas recirculation line is branched off from the exhaust line to the air intake pipe and is controlled by a controllable throughput control valve which is controlled by the electronic control unit, to which an actual value transmitter is sent Water flow sensor in the
ERSÄΓZBLÄΓT (REGEL 26) Wasserzuleitung, ein Dieselöl-Durchsatzfühler in der Dieselölzuleitung, ein Motordrehzahlfühler sowie ein in der Abgasleitung angeordneter Sauerstoffühler angeschlossen sind. In dieser Weise kann von der elektronischen Regeleinheit nicht nur der Wasseranteil in der Emulsion, sondern auch die Menge des zurückgeführten Abgases nach vorbestimmten Regelkennfeldern optimiert geregelt werden.ERSÄΓZBLÄΓT (RULE 26) Water supply line, a diesel oil flow sensor in the diesel oil supply line, an engine speed sensor and an oxygen sensor arranged in the exhaust line are connected. In this way, not only the water content in the emulsion, but also the amount of the returned exhaust gas can be optimally controlled by the electronic control unit according to predetermined control characteristics.
Ferner kann, wie weiter oben bereits angesprochen, an die elektronische Regeleinheit als zusätzlicher Istwertgeber ein in dem Luftansaugrohr stromaufwärts der Stelle, an der das Abgas in das Luftansaugrohr eingeführt wird, angeordneter Luftdurchsatzfühler angeschlossen sein.Furthermore, as already mentioned above, an air flow sensor arranged in the air intake pipe upstream of the point at which the exhaust gas is introduced into the air intake pipe can be connected to the electronic control unit as an additional actual value transmitter.
Die Erfindung wird im folgenden anhand der Zeichnung erläutert, aus welcher eine erfindungsgemäße Einrichtung als AuslegungsSchema ersichtlich ist. In der Zeichnung zeigen:The invention is explained below with reference to the drawing, from which a device according to the invention can be seen as a design diagram. The drawing shows:
Fig. 1 das Auslegungsschema beim Emulsionsbetrieb bei voller Last,1 shows the design scheme for emulsion operation at full load,
Fig. 2 das Auslegungsschema beim Umstellen vom Emulsionsbetrieb auf den reinen Dieselölbetrieb,2 shows the design diagram when switching from emulsion operation to pure diesel oil operation,
Fig. 3 das AuslegungsSchema beim Leerlaufbetrieb mit reinem Dieselöl,3 shows the design diagram during idle operation with pure diesel oil,
Fig. 4 das Auslegungsschema beim Umstellen vom reinen Dieselölbetrieb auf Emulsionsbetrieb,4 shows the layout diagram when switching from pure diesel oil operation to emulsion operation,
Fig. 5 eine schematische Ansicht eines in das Luftansaugrohr des Dieselmotors eingebauten Flansches zur Abgasrückführung, und5 is a schematic view of a flange for exhaust gas recirculation installed in the air intake pipe of the diesel engine, and
Fig. 6 den Schnitt des Flansches gemäß der Schnittlinie Z-Z in Fig. 5.6 shows the section of the flange along the section line Z-Z in FIG. 5.
Anhand Fig. 1 wird zunächst der grundsätzliche Aufbau einer1, the basic structure of a
ERSÄΓZBLÄTT(REGEL26) erfindungsgemäßen Einrichtung zum Betreiben eines Dieselmotors wahlweise mit reinem Dieselöl oder mit einer Wasser-in- Dieselöl-Emulsion erläutert. Die Einspritzpumpe 1 des Dieselmotors ist mit einer Mischvorrichtung 6, in welcher die Emulsion erzeugt wird, in einen gemeinsamen Rezirkulationskreis 2 bis 5 eingeschaltet. In die Mischvorrichtung 6 münden eine Dieselölzuleitung 8 und über ein intermittierend betriebenes, gesteuertes Wassereinspritzventil 27 eine Wasserzuleitung 7. Das lediglich schematisch gezeigte Wassereinspritzventil 27 wird von einer elektronischen Regeleinheit 23 gesteuert, von welcher die eingespritzte Wassermenge pro Zeiteinheit, und damit der Wasseranteil in der Emulsion, in Abhängigkeit von dem Dieselöldurchsatz, der mit einem in die Dieselölleitung eingeschalteten Dieselöl-Durchsatzfühler 25 gemessen wird, und der Drehzahl des Motors bestimmt werden. In den VorlaufzweigERSÄΓZBLÄTT (REGEL26) Device according to the invention for operating a diesel engine explained either with pure diesel oil or with a water-in-diesel oil emulsion. The injection pump 1 of the diesel engine is connected to a common recirculation circuit 2 to 5 with a mixing device 6, in which the emulsion is generated. A diesel oil supply line 8 opens into the mixing device 6 and a water supply line 7 via an intermittently operated, controlled water injection valve 27. The water injection valve 27, which is only shown schematically, is controlled by an electronic control unit 23, by which the injected water quantity per unit of time, and thus the water content in the emulsion , depending on the diesel oil flow rate, which is measured with a diesel oil flow rate sensor 25 connected to the diesel oil line, and the speed of the engine. In the lead branch
2, 3 des Rezirkulationskreises zwischen der Mischvorrichtung 6 und der Einspritzpumpe 1 ist ein als Dreiwegventil gestaltetes, von einer elektronischen Regeleinheit 22 gesteuertes erstes Magnetventil 10 eingeschaltet, von dem der Strömungsdurchgang entweder von der Mischvorrichtung 6 oder von einer2, 3 of the recirculation circuit between the mixing device 6 and the injection pump 1, a first solenoid valve 10, designed as a three-way valve and controlled by an electronic control unit 22, is switched on, from which the flow passage either from the mixing device 6 or from one
Bypassleitung 9, die von der Dieselölzuleitung 8 abgezweigt ist, zu dem zur Einspritzpumpe 1 führenden Rezirkulationszweig freigegeben wird.Bypass line 9, which branches off from the diesel oil supply line 8, is released to the recirculation branch leading to the injection pump 1.
Nahe an der Einspritzpumpe 1 sind ein kleinerClose to the injection pump 1 are a small one
Emulsionsvorratsraum 12 und ein kleiner Dieselölvorratsraum 13, beispielsweise jeweils mit einem Volumen von 600 cm3, angeordnet, die durch eine als elastische Membran ausgebildete gemeinsame verlagerbare Trennwand voneinander getrennt sind. In den Rücklaufzweig 4, 5 des Rezirkulationskreises von derEmulsion storage room 12 and a small diesel oil storage room 13, for example each with a volume of 600 cm 3 , which are separated from one another by a common displaceable partition formed as an elastic membrane. In the return branch 4, 5 of the recirculation circuit from the
Einspritzpumpe 1 zur Mischkammer 6 ist ein als Vierwegeventil ausgebildetes zweites gesteuertes Magnetventil 24 eingeschaltet, von dem der Rücklauf 4 von der Einspritzpumpe 1 gesteuert wahlweise auf die Rückführleitung zur Mischvorrichtung 6, zu dem Emulsionsvorratsraum 12 hin oder zu dem Dieselölvorratsraum 13 hin geschaltet werden kann. In die Rücklaufleitung 4 zwischen dem zweiten Magnetventil 11 und der Einspritzpumpe 1 sind ein als Dreiwegeventil ausgebildetesInjection pump 1 to the mixing chamber 6 is a second controlled solenoid valve 24, designed as a four-way valve, from which the return 4 controlled by the injection pump 1 can optionally be switched to the return line to the mixing device 6, to the emulsion storage space 12 or to the diesel oil storage space 13. In the return line 4 between the second solenoid valve 11 and the injection pump 1 are designed as a three-way valve
FRS«tTZBLÄΪT (REGEL 26) fünftes Magnetventil 19 und zwischen diesem und dem zweiten Magnetventil 11 eine als Zahnradpumpe ausgebildete Pumpe 17 eingeschaltet, die von einer Umgehungsleitung 20 umgangen wird. Mit dem fünften Magnetventil 19 kann der Rücklauf 4 von der Einspritzpumpe gesteuert wahlweise in die Pumpe 17 oder in die Umgehungsleitung 20 geleitet werden, die zwischen der Pumpe 17 und dem zweiten Magnetventil 11 wieder in den Rücklaufzweig 4, 5 des Rezirkulationskreises einmündet.FRS «tTZBLÄΪT (RULE 26) fifth solenoid valve 19 and between this and the second solenoid valve 11 a pump 17 designed as a gear pump, which is bypassed by a bypass line 20. With the fifth solenoid valve 19, the return line 4 can be directed, controlled by the injection pump, either into the pump 17 or into the bypass line 20, which opens again into the return branch 4, 5 of the recirculation circuit between the pump 17 and the second solenoid valve 11.
Weiter sind in den zur Einspritzpumpe 1 führendenNext are those leading to the injection pump 1
Rezirkulationszweig 3 ein drittes Magnetventil 14 und ein viertes Magnetventil 15 eingeschaltet, die jeweils als Dreiwegeventil ausgebildet sind und mit denen gesteuert wahlweise der Emulsionsvorratsraum 12 oder der Dieselölvorratsraum auf den Zulauf zur Einspritzpumpe 1 geschaltet werden können. Diese Magnetventile 14, 15 sollen möglichst nahe beieinander und möglichst nahe am Eingang der Einspritzpumpe angeordnet sein.Recirculation branch 3, a third solenoid valve 14 and a fourth solenoid valve 15 are switched on, each of which is designed as a three-way valve and with which the emulsion storage space 12 or the diesel oil storage space can be switched to the feed to the injection pump 1 in a controlled manner. These solenoid valves 14, 15 should be arranged as close as possible to one another and as close as possible to the inlet of the injection pump.
In die zur Mischvorrichtung 6 zurückführende Leitung 5 ist zwischen dem zweiten Magnetventil 11 und der Mischvorrichtung 6 ein als Dreiwegeventil ausgebildetes sechstes Magnetventil 24 eingeschaltet, mit dem die Leitung 5 gesteuert wahlweise auf die Mischvorrichtung 6 oder auf den Dieselöltank geschaltet werden kann.In the line 5 leading back to the mixing device 6, between the second solenoid valve 11 and the mixing device 6, a sixth solenoid valve 24 designed as a three-way valve is switched, with which the line 5 can be selectively switched to the mixing device 6 or to the diesel oil tank.
In die Wasserzuleitung ist ferner ein Wasserdurchsatzfühler 21 eingeschaltet. Wenn mit dem Wasserdurchsatzfühler 21 in der Emulsionsbetriebsweise nicht zu vorbestimmten Sollwerten, die in der elektronischen Regeleinheit gespeichert sind, passende Wasserdurchsätze gemessen werden, so wird ein Befehl zur Herunterregelung des Hubes der Regelstange der Einspritzpumpe 1 mittels eines Hubmagneten erzeugt und ggf. die weitere Wasserzufuhr zur Mischkammer 6 abgeschaltet.A water flow sensor 21 is also switched on in the water supply line. If the water flow sensor 21 in the emulsion mode of operation does not measure suitable water flow rates to predetermined target values that are stored in the electronic control unit, then a command for reducing the stroke of the control rod of the injection pump 1 is generated by means of a lifting magnet and, if necessary, the further water supply Mixing chamber 6 switched off.
In den Fig. 1 bis 4 sind mit gestrichelten Linien abgeschaltete Leitungszweige und mit durchgezogenen Linien aktuell durchströmte Leitungszweige gekennzeichnet. Die Betriebsweise1 to 4, line branches which are switched off with broken lines and line branches which are currently flowed through with solid lines are identified. The mode of operation
ERSÄΓZBLÄΓT(REGEL26) der Einrichtung ist wie folgt:ERSÄΓZBLÄΓT (RULE 26) the establishment is as follows:
Fig. 1 gibt den Zustand in der Emulsionsbetriebsweise bei vollem Lastzustand des Dieselmotors an. Die in der Mischvorrichtung 6 erzeugte Emulsion wird bei entsprechend eingesteuerten Magnetventilen der Einspritzpumpe 1 zugeführt, deren Rücklauf wieder in die Mischvorrichtung 6 zurückgeleitet wird. Die Pumpe 17 wird ausgeschaltet und wird von dem Rezirkulat umgangen. Der Emulsionsvorratsraum 13 ist leer und der Dieselölvorratsraum ist mit reinem Dieselöl gefüllt.Fig. 1 indicates the state in the emulsion mode at full load of the diesel engine. The emulsion generated in the mixing device 6 is fed to the injection pump 1 with appropriately controlled solenoid valves, the return flow of which is fed back into the mixing device 6. The pump 17 is switched off and is bypassed by the recirculate. The emulsion storage space 13 is empty and the diesel oil storage space is filled with pure diesel oil.
Sinkt nun die Motordrehzahl oder die Last unter einen vorbestimmten Wert (z.B. eine Drehzahl von 800 - 900 min"1 und eine Last von ungefähr 10%), so soll die Emulsionsbetriebsweise beendet und auf reine Dieselölbetriebsweise umgestellt werden. Die Umstellungsphase ist aus Fig. 2 ersichtlich. Das erste Magnetventil 10 schaltet von der Mischvorrichtung auf die Bypassleitung 9 und somit auf reine Dieselölzufuhr um. Gleichzeitig öffnet das dritte Magnetventil 14 den Dieselölvorratsraum 13 zu der Einspritzpumpe 6 hin, dieNow decreases the engine speed or the load below a predetermined value (for example, a rotational speed of 800 to 900 min "1 and a load of about 10%), so the emulsion operation is to be terminated and switched to pure diesel operation of the changeover phase is in Fig. 2. The first solenoid valve 10 switches from the mixing device to the bypass line 9 and thus to pure diesel oil supply At the same time, the third solenoid valve 14 opens the diesel oil storage space 13 to the injection pump 6
Rücklaufleitung 4 wird von dem fünften Magnetventil 19 an die Druckpumpe 17 geschaltet und diese wird eingeschaltet. Zugleich wird das zweite Magnetventil 11 auf den Emulsionsvorratsraum 12 umgestellt. Der in der Einspritzpumpe befindliche Emulsionsrest wird von der Pumpe 17 abgesaugt und über das zweiteReturn line 4 is switched from the fifth solenoid valve 19 to the pressure pump 17 and this is switched on. At the same time, the second solenoid valve 11 is switched to the emulsion storage space 12. The emulsion residue in the injection pump is sucked off by the pump 17 and via the second
Magnetventil 11 in den Emulsionsvorratsraum gedrückt. Dadurch wird dieser mit Restemulsion gefüllt und das Dieselöl aus dem Dieselölvorratsraum 13 wird in die Einspritzpumpe 1 verdrängt und diese wird dadurch mit reinem Dieselöl gespült. Nach kurzer Zeitspanne, wenn die Restemulsion aus der Einspritzpumpe 1 verdrängt ist, jedoch bevor nachfließendes Dieselöl am zweiten Magnetventil 11 angekommen ist, beispielsweise nach 3 s, werden unter der automatischen Steuerung durch die elektronische Regeleinheit 22 die Pumpe 17 ausgeschaltet und das zweite 11, das dritte 14 und das fünfte 19 Magnetventil wieder in die Schaltstellung nach Fig. 1 zurückgeschaltet, wohingegen das erste Magnetventil auf die Bypassleitung 9, d.h. auf reine Dieselölzufuhr geschaltet bleibt.Solenoid valve 11 pressed into the emulsion storage space. As a result, the latter is filled with residual emulsion and the diesel oil from the diesel oil storage space 13 is displaced into the injection pump 1 and this is thereby flushed with pure diesel oil. After a short period of time, when the residual emulsion is displaced from the injection pump 1, but before flowing diesel oil arrives at the second solenoid valve 11, for example after 3 s, the pump 17 is switched off under the automatic control by the electronic control unit 22 and the second 11, the third 14 and the fifth 19 solenoid valve switched back to the switching position according to FIG. 1, whereas the first solenoid valve on the bypass line 9, ie remains switched to pure diesel oil supply.
ERSATZBLÄΓT(REGEL26) Im Leerlauf wird daher der Motor mit reinem Dieselöl betrieben, wobei die Umstellung auf die Dieselölbetriebsweise durch das Spülen der Einspritzpumpe mit dem Dieselöl aus dem Dieselölvorratsraum sehr rasch erfolgt. DieseSPARE BLADE (RULE 26) The engine is therefore operated with pure diesel oil at idle, the changeover to the diesel oil mode of operation being carried out very quickly by flushing the injection pump with the diesel oil from the diesel oil storage space. This
Dieselölbetriebsweise und die zugehörigen Schaltstellungen der Magnetventile sind aus Fig. 3 ersichtlich. 2 bis 3 min nach Erreichen des Leerlaufzustandes wird der Rücklauf aus der Einspritzpumpe 1 von dem sechsten Magnetventil 24 auf den Dieselöltank umgeschaltet.Diesel oil mode of operation and the associated switching positions of the solenoid valves are shown in FIG. 3. 2 to 3 minutes after the idling state has been reached, the return flow from the injection pump 1 is switched from the sixth solenoid valve 24 to the diesel oil tank.
Wenn der Motor aus dem Leerlauf heraus beschleunigt wird, erfolgt wieder die Umstellung auf den Emulsionsbetrieb, wobei nun die Einspritzpumpe 1 rasch mit Emulsion gespült wird, die mittels der Pumpe 17 durch das Auffüllen des Dieselölvorratsraums 13 mit Restdieselöl aus der Einspritzpumpe aus dem Emulsionsvorratsraum über das vierte Magnetventil 15 zur Einspritzpumpe 1 hin verdrängt wird. Da der Inhalt des Pumpenraums der Einspritzdüse rasch durch Emulsion ersetzt wird, wird eine Rauchbildung beim Beschleunigen verhindert oder wenigstens stark vermindert. Diese Umstellung von derWhen the engine is accelerated out of idle, the switch back to the emulsion mode takes place, the injection pump 1 now being quickly flushed with emulsion, which is pump 17 by filling the diesel oil storage space 13 with residual diesel oil from the injection pump from the emulsion storage space via the fourth solenoid valve 15 is displaced towards the injection pump 1. Since the contents of the pump chamber of the injection nozzle are quickly replaced by emulsion, smoke formation during acceleration is prevented or at least greatly reduced. This change from the
Dieselölbetriebsweise auf die Emulsionsbetriebsweise und die Stellung der Magnetventile dabei ist aus Fig. 4 ersichtlich. Das erste Magnetventil 10 und das sechste Magnetventil 24 werden wieder auf die Mischvorrichtung 6 umgestellt und nach kurzer Zeitspanne, z.B. 3 s, werden wieder die Schaltzustände der Magnetventile aus Fig. 1 erreicht.Diesel oil mode of operation on the emulsion mode of operation and the position of the solenoid valves can be seen from FIG. 4. The first solenoid valve 10 and the sixth solenoid valve 24 are switched back to the mixing device 6 and after a short period of time, e.g. 3 s, the switching states of the solenoid valves from FIG. 1 are reached again.
Erfindungsgemäß wird außerdem ein Teil des Abgases in das in den Fig. 1 bis 4 schematisch gezeigte Luftansaugrohr 30 des Dieselmotors zurückgeführt. Hierzu zweigt von der Abgasleitung 31 des Dieselmotors eine zum Luftansaugrohr 30 führende Abgasrückführleitung 32 ab, in die ein steuerbares Durchsatzsteuerventil 33 eingeschaltet ist, das von der elektronischen Regeleinheit 22 gesteuert wird. Weiter ist in die Abgasleitung 31 ein Sauerstoffühler 34 eingebaut, der vorzugsweise wie die für Ottomotoren mit Katalysator bekannte Lambda-Sonde als Zirkoniumdioxid-Fühler ausgebildet ist und als Istwertgeber an die elektronische Regeleinheit 22 angeschlossenAccording to the invention, part of the exhaust gas is also returned to the air intake pipe 30 of the diesel engine shown schematically in FIGS. 1 to 4. For this purpose, an exhaust gas return line 32 leading to the air intake pipe 30 branches off from the exhaust line 31 of the diesel engine, into which a controllable throughput control valve 33 is switched on, which is controlled by the electronic control unit 22. Furthermore, an oxygen sensor 34 is installed in the exhaust line 31, which is preferably designed as a zirconium dioxide sensor like the lambda probe known for gasoline engines with a catalyst and is connected to the electronic control unit 22 as an actual value transmitter
ERSATZBLÄΓΓ (REGEL 26) ist .SPARE BLADES (RULE 26) is.
Von der elektronischen Regeleinheit 22 wird auch das Durchsatzsteuerventil 33 gesteuert, mit welchem die zurückgeführte Abgasmenge eingestellt wird. Dies erfolgt nach vorbestimmten Kennfeldern, die als Sollwerte in der elektronischen Regeleinheit 22 gespeichert sind, im unteren Lastbereich und im Leerlauf, wo der Wasseranteil in der Emulsion gering ist oder im Dieselöl fehlt, hauptsächlich aufgrund der vom Sauerstoffühler 34 gemessenenThe electronic control unit 22 also controls the throughput control valve 33 with which the recirculated exhaust gas quantity is set. This takes place according to predetermined characteristic maps, which are stored as setpoints in the electronic control unit 22, in the lower load range and at idle, where the water content in the emulsion is low or is missing in the diesel oil, mainly on the basis of those measured by the oxygen sensor 34
Sauerstoffanteile im Abgas, und im oberen Lastbereich und bei höheren Drehzahlen hauptsächlich in Abhängigkeit vom Wasseranteil in der Emulsion.Oxygen content in the exhaust gas, and in the upper load range and at higher speeds mainly depending on the water content in the emulsion.
Die Figuren 5 und 6 zeigen einen Flansch, der in dasFigures 5 and 6 show a flange which in the
Luftansaugrohr 30 eingeschaltet wird. Die Strömungsrichtung der Ansaugluft ist in Fig. 6 durch einen Pfeil angegeben. Der Flansch bildet eine düsenartige QuerSchnittsVerengung 35 des Strömungsquerschnitts, an die sich eine gestufte Querschnittserweiterung 36 anschließt, an der imAir intake pipe 30 is turned on. The direction of flow of the intake air is indicated by an arrow in FIG. 6. The flange forms a nozzle-like cross-sectional constriction 35 of the flow cross-section, which is followed by a stepped cross-sectional widening 36, on which the
Ausführungsbeispiel vier Abgasrückführungskanäle 37 tangential einmünden, die an die Abgasrückführleitung 32 angeschlossen sind.Embodiment four exhaust gas recirculation channels 37 open tangentially, which are connected to the exhaust gas recirculation line 32.
Wenngleich die erfindungsgemäße Einrichtung zum Betreiben eines Dieselmotors bevorzugt den aus den Fig. 1 bis 4 ersichtlichen Aufbau hat, kann sie sinnvoll auch in anderen Systemen eingesetzt werden, und zwar insbesondere auch in solchen, bei denen von dem Emulsionsvorratsraum 12 und dem Dieselölvorratsraum 13 für den Übergang zwischen der Betriebsweise mit reinem Dieselöl und der Emulsionsbetriebsweise nicht Gebrauch gemacht wird. Although the device according to the invention for operating a diesel engine preferably has the structure shown in FIGS. 1 to 4, it can also be used expediently in other systems, in particular also in those in which the emulsion storage space 12 and the diesel oil storage space 13 for the Transition between the pure diesel mode and the emulsion mode is not used.

Claims

Patentansprüche Claims
1. Verfahren zum Betreiben eines Dieselmotors, dem eine Wasser- in-Dieselöl-Emulsion mit in Abhängigkeit von der Motordrehzahl und dem Lastzustand des Motors veränderlichem Wasseranteil zugeführt wird, dadurch gekennzeichnet, daß in das Luftansaugrohr des Dieselmotors Abgas desselben zurückgeführt wird und der zurückgeführte Abgasanteil gesteuert wahlweise proportional zu dem Wasseranteil und/oder zu dem Sauerstoffanteil im Abgas verändert wird.1. A method for operating a diesel engine, which is supplied with a water-in-diesel oil emulsion with a variable water content depending on the engine speed and the load condition of the engine, characterized in that exhaust gas of the same is returned to the air intake pipe of the diesel engine and the returned exhaust gas content controlled, optionally proportional to the water content and / or to the oxygen content in the exhaust gas is changed.
2. Verfahren nach Anspruch 1, bei welchem der zurückgeführte Abgasanteil gesteuert wahlweise zusätzlich proportional zu dem Luftdurchsatz im Luftansaugrohr verändert wird.2. The method according to claim 1, in which the recirculated exhaust gas fraction is optionally also controlled in proportion to the air throughput in the air intake pipe.
3. Verfahren nach Anspruch 1 oder 2, bei welchem der Luftstrom im Luftansaugrohr durch eine düsenartige Verengung und eine sich daran anschließende plötzliche Erweiterung zunächst beschleunigt und dann wieder verzögert wird und das Abgas in das Luftansaugrohr in Höhe der Erweiterung tangential eingeführt wird.3. The method of claim 1 or 2, wherein the air flow in the air intake pipe is first accelerated and then decelerated by a nozzle-like constriction and a subsequent sudden expansion and the exhaust gas is introduced tangentially into the air intake pipe at the level of the expansion.
4. Einrichtung zum Betreiben eines Dieselmotors, der eine Abgasleitung (31), ein Luftansaugrohr (30) und eine Einspritzpumpe (1) aufweist, der in einem Rezirkulationskreis (2 bis 5) eine zum Vermischen von Wasser mit Dieselöl zu einer Wasser-in-Dieselöl-Emulsion dienende Mischvorrichtung (6) vorgeschaltet ist, in die eine Dieselölzuleitung (8) und über eine steuerbare Wassereinspritzdüse (27) eine Wasserzuleitung (7) münden, wobei die Wassereinspritzdüse (27) von einer elektronischen Regeleinheit (22, 23) für eine Änderung des Wasseranteils in der Emulsion in Abhängigkeit von dem Lastzustand und/oder der Drehzahl des Dieselmotors gesteuert ist, dadurch gekennzeichnet, von der Abgasleitung (31) zu dem Luftansaugrohr (30) eine Abgasrückführleitung (32) abgezweigt ist, die von einem Durchsatzsteuerventil (33) beherrscht ist, das von der elektronischen Regeleinheit (22) gesteuert ist, an welche als Istwertgeber ein Wasserdurchsatzfühler (21) in der4. Device for operating a diesel engine, which has an exhaust pipe (31), an air intake pipe (30) and an injection pump (1), which in a recirculation circuit (2 to 5) one for mixing water with diesel oil to a water-in Diesel oil emulsion-serving mixing device (6) is connected upstream, into which a diesel oil supply line (8) and a controllable water injection nozzle (27) lead to a water supply line (7), the water injection nozzle (27) being controlled by an electronic control unit (22, 23) for a Change in the water content in the emulsion as a function of the load condition and / or the speed of the diesel engine is controlled, characterized in that an exhaust gas recirculation line (32) is branched from the exhaust gas line (31) to the air intake pipe (30) and is derived from a flow control valve (33 ) is controlled, which is controlled by the electronic control unit (22), to which a water flow sensor (21) in the
ERSATZBLÄTT {REGEL 26) Wasserzuleitung (7), ein Dieselöl-Durchsatzfühler (25) in der Dieselölzuleitung (8), ein Motordrehzahlfühler sowie ein in der Abgasleitung (31) angeordneter Sauerstoffühler (34) angeschlossen sind.ERSATZBLÄTT {RULE 26) Water supply line (7), a diesel oil flow sensor (25) in the diesel oil supply line (8), an engine speed sensor and an oxygen sensor (34) arranged in the exhaust line (31) are connected.
5. Einrichtung nach Anspruch 4, bei welchem an die elektronische Regeleinheit (22) als zusätzlicher Istwertgeber ein Luftdurchsatzfühler in dem Luftansaugrohr angeschlossen ist.5. Device according to claim 4, in which an air flow sensor in the air intake pipe is connected to the electronic control unit (22) as an additional actual value transmitter.
6. Einrichtung nach Anspruch 4 oder 5, bei welcher in dem Luftansaugrohr eine düsenartige Querschnittsverengung (35) und eine sich daran anschließende stufenartige Querschnittserweiterung (36) ausgebildet sind, in welche wenigstens ein Abgasrückführkanal (37) tangential einmündet. 6. Device according to claim 4 or 5, in which in the air intake pipe a nozzle-like cross-sectional constriction (35) and an adjoining step-like cross-sectional widening (36) are formed, into which at least one exhaust gas recirculation channel (37) opens tangentially.
PCT/EP1995/001390 1994-04-14 1995-04-13 Method and device for operating a diesel engine WO1995028558A2 (en)

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