EP0193754B1 - Mechanical fuel injection - Google Patents

Mechanical fuel injection Download PDF

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Publication number
EP0193754B1
EP0193754B1 EP86101722A EP86101722A EP0193754B1 EP 0193754 B1 EP0193754 B1 EP 0193754B1 EP 86101722 A EP86101722 A EP 86101722A EP 86101722 A EP86101722 A EP 86101722A EP 0193754 B1 EP0193754 B1 EP 0193754B1
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EP
European Patent Office
Prior art keywords
fuel
injection valve
injection
cylinder
central
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EP86101722A
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German (de)
French (fr)
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EP0193754A3 (en
EP0193754A2 (en
Inventor
Herbert Brockhaus
Fritz Dr. Naumann
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Audi AG
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Audi AG
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Priority to AT86101722T priority Critical patent/ATE57423T1/en
Publication of EP0193754A2 publication Critical patent/EP0193754A2/en
Publication of EP0193754A3 publication Critical patent/EP0193754A3/en
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    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/52—Arrangement of fuel metering devices
    • 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
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/18—DOHC [Double overhead camshaft]

Definitions

  • the invention relates to a mechanical fuel injection according to the preamble of claim 1.
  • Such a fuel injection is installed under the trademark "Bosch K-Jetronic" as standard in a large number of motor vehicles. It is provided that, in addition to the injection valves assigned to each cylinder, a cold start enrichment valve is provided which additionally injects an additional total into an intake manifold section, which is assigned to all cylinders, during the cold start.
  • the object of the invention is to provide a generic fuel injection system which enables improved fuel metering when idling.
  • a central injection valve which injects fuel into the intake manifold and supplies all cylinders of the motor vehicle via this central injection at idle. Since the cylinder injection valves are then preferably switched off completely, the entire fuel quantity is supplied via the central injection, so that the fuel quantity to be supplied is a multiple (at least four times in the case of the four-cylinder engine) of the fuel quantity to be supplied otherwise by the individual cylinder injection valves.
  • the tolerance differences are not so important and the mixture preparation is significantly improved. The run speed can be further reduced to save fuel.
  • this amount of fuel is, as before, supplied decentrally to the individual cylinders via the cylinder injection valves.
  • the cylinder injection valves are completely closed when idling, so that the fuel supply takes place solely through the central injection valve. This allows the idling to be coordinated exactly.
  • the central injection valve which ensures the idle supply, can run along.
  • the central injection valve is preferably switched off at higher load states when the cylinder injection valves come into action.
  • the central injection valve can also run under partial and full load conditions and can be controlled to maintain the stoichiometric ratio, while the cylinder injection valves do not need to be controlled as well.
  • the AE control can thus be implemented structurally with reduced effort, since only the central injection valve is controlled by the control.
  • Fig. 1 denotes a cylinder of an internal combustion engine which has an inlet opening through which an inlet valve 12 in the open state allows a fuel-air mixture to enter.
  • a suction pipe which has a section 14, leads through to the cylinder, through which air is supplied, which is then divided into sections 16 in front of the individual cylinders.
  • section 16 that is to say in the sections individually assigned to each cylinder 12, there is an injection directly in front of the inlet valve 12 valve 17, which injects fuel via a line 36 upstream of the inlet valve.
  • the amount of air sucked in by an air inlet opening 20 is controlled by a throttle valve 18.
  • a cold start valve 32 which provides a cold start enrichment in a known manner by injecting fuel supplied via a line 30 into the intake manifold.
  • a mixture control device 22 is provided, which is installed in large numbers in series and is state of the art.
  • This mixture control system 22 has an air flow meter 24, which is formed by a baffle plate, in a known manner. The deflection of the air flow meter 24 controls the amount of fuel supplied to the cylinder injection valve 17 via the line 36.
  • an injection valve 44 for central injection of fuel is provided in the intake manifold section 14, that is to say in the intake manifold section which is common to all cylinders.
  • the optimal location is directly behind the throttle valve, where the swirling of the intake air is large and good mixing is guaranteed.
  • the injection directly at the downstream mouth of the bypass bypassing the throttle valve is ideal for idling.
  • the central injection valve 44 is connected via a fuel line 42 to a metering chamber in the mixture control system.
  • the fuel quantities to the cylinder injection valves 17 and the central injection valve 44 are controlled via a fuel quantity divider 40, which is shown in detail in FIG. 2.
  • the fuel quantity divider 40 contains a control piston 58 which is axially movable in a cylindrical bore 54 in a housing 52.
  • a system pressure 56 is applied to the piston 58 from one side, and the piston is raised or lowered in the axial direction by the air flow meter from the other side.
  • the piston has a collar 60 and 62 in the upper and lower region, each of which seals in the bore 54.
  • the piston 58 has a smaller diameter between the two collars 60 and 62.
  • a fuel supply line 64 opens into the bore 54 in the region of the smaller diameter, a fuel outflow 66 which opens into the line 36 for the cylinder injection valve 17 leads away from the bore 54.
  • the collar 60 closes the fuel drain line 66 completely or releases it to an increasing extent.
  • the line 42 which leads to the central injection valve 44, is connected in the fuel quantity divider to the connection 68, which through the collar 60 is optionally dependent on the position of the control piston. can be opened.
  • An incision 72 is provided in the collar 60, which ensures that the line 68 is supplied with fuel even in the idle position of the control piston.
  • the feed line 65 for the central injection valve is opened or closed by a projection 70 of the collar 62, depending on the position of the control piston, the inlet 65 being partially free in the idle position, so that it is connected to the outlet 68.
  • Fig. 2b shows the position of the control piston at partial load, it can be clearly seen that the projection 70 in this case already completely blocks the inlet 65 when the control piston is raised so that the central injection valve 44 no longer receives any fuel.
  • the cylinder injection valves are now connected to the fuel supply, and in the full-load position, as shown in FIG. 2 c, even more fuel flows to the cylinder injection valves 17.
  • a passive overlap of the central injection mode and the cylinder mode is desirable.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Glass Compositions (AREA)
  • Lens Barrels (AREA)

Abstract

1. Mechanical fuel injection for an internal combustion engine having a fuel pump, a fuel accumulator, a mixture regulator (22) with fuel distributor (40) which opens a fuel supply to injection valves (17, 32, 44) by means of a displacement, controlled by the airflow sensor (24), through built-in metering slits, a cylinder injection valve (17) being associated with each cylinder of the internal combustion engine, having a central injection valve (32) for the cold-start enrichment and an airflow sensor (24) associated with the mixture regulator, said airflow sensor controlling the fuel distributor (40), characterized in that a further fuel central injection valve (44) is provided in a suction tube section (14) common to all cylinders, of the internal combustion engine, said suction tube section being supplied in the idling mode with a predeterminable amount of fuel, and in that the metering slits for the cylinder injection-valves (17) are completely closed in the idling mode and an additional metering slit for the central injection valve (44) is provided, said metering slit opening at least in the idling mode.

Description

Die Erfindung betrifft eine mechanische Kraftstoffeinspritzung gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a mechanical fuel injection according to the preamble of claim 1.

Eine derartige Kraftstoffeinspritzung wird unter dem Warenzeichen "Bosch K-Jetronic" serienmäßig in einer Vielzahl von Kraftfahrzeugen verbaut. Dabei ist vorgesehen, daß zusätzlich zu den jedem Zylinder zugeordneten Einspritzventilen ein Kaltstartanreicherventil vorgesehen ist, das insgesamt in einen Saugrohrabschnitt, der allen Zylindern zugeordnet ist, beim Kaltstart zusätzlich einspritzt.Such a fuel injection is installed under the trademark "Bosch K-Jetronic" as standard in a large number of motor vehicles. It is provided that, in addition to the injection valves assigned to each cylinder, a cold start enrichment valve is provided which additionally injects an additional total into an intake manifold section, which is assigned to all cylinders, during the cold start.

Weiterhin ist aus der US-Patentschrift 4,418,672 bekannt, zusätzlich zu den Einspritzdüsen noch einen Ultraschallzerstäuber vorzusehen, um das Brennstoff-Luft-Gemisch durch zusätzlichen Brennstoff zu korrigieren.Furthermore, it is known from US Pat. No. 4,418,672 to provide an ultrasonic atomizer in addition to the injection nozzles in order to correct the fuel-air mixture by means of additional fuel.

Aufgrund von Toleranzproblemen sind die Anforderungen an die Genauigkeit der Einspritzmenge bei geringen Einspritzmengen, also insbesondere im Leerlauf, zur Sicherung eines stabilen Leerlaufes verhältnismäßig hoch.Due to tolerance problems, the requirements for the accuracy of the injection quantity in the case of small injection quantities, that is to say in particular when idling, are relatively high in order to ensure stable idling.

Auch eventuelle Kraftstoffverluste durch Niederschlag an den Saugrohrwänden verringert den Anteil der tatsächlich in den Zylindern gelangenden Kraftstoffmenge, so daß der Leerlauf der Brennkraftmaschine verhältnismäßig empfindlich ist.Possible fuel losses due to precipitation on the intake manifold walls also reduce the proportion of the amount of fuel actually entering the cylinders, so that the idling of the internal combustion engine is relatively sensitive.

Aufgabe der Erfindung ist es, ein gattungsgemäßes Kraftstoffeinspritzsystem zu schaffen, das eine verbesserte Kraftstoffdosierung im Leerlauf ermöglicht.The object of the invention is to provide a generic fuel injection system which enables improved fuel metering when idling.

Die Aufgabe wird gelöst durch den Hauptanspruch.The task is solved by the main claim.

Erfindungsgemäß ist dementsprechend vorgesehen, daß zusätzlich zu den Zylindereinspritzventilen ein zentrales Einspritzventil vorgesehen ist, das Kraftstoff in das Saugrohr einspritzt und über diese Zentraleinspritzung im Leerlauf alle Zylinder des Kraftfahrzeuges versorgt. Da dann vorzugsweise die Zylindereinspritzventile vollständig abgeschaltet sind, wird die gesamte Kraftstoffmenge über die Zentraleinspritzung geliefert, so daß die zuzuführende Kraftstoffmenge ein Vielfaches (beim Vier-Zylinder-Motor mindestens das Vierfache) der sonst von den einzelnen Zylindereinspritzventilen zuzuführenden Kraftstoffmenge beträgt. Die Toleranzunterschiede fallen dadurch nicht so sehr ins Gewicht, und die Gemischaufbereitung wird deutlich verbessert. Die Lehrlaufdrehzahlen können zur Kraftstoffeinsparung noch weiter abgesenkt werden.According to the invention it is accordingly provided that, in addition to the cylinder injection valves, a central injection valve is provided which injects fuel into the intake manifold and supplies all cylinders of the motor vehicle via this central injection at idle. Since the cylinder injection valves are then preferably switched off completely, the entire fuel quantity is supplied via the central injection, so that the fuel quantity to be supplied is a multiple (at least four times in the case of the four-cylinder engine) of the fuel quantity to be supplied otherwise by the individual cylinder injection valves. The tolerance differences are not so important and the mixture preparation is significantly improved. The run speed can be further reduced to save fuel.

Dabei wird bei dem aus dem Stand der Technik bekannten Kraftstoffmengenteiler, der mit Steuerschlitzen arbeitet, ein zusätzlicher Steuerschlitz für das Zentraleinspritzventil vorgesehen. Dieser Mengenteiler, der gleichzeitig die Zylindereinspritzventile ansteuert, erhält eine entsprechende Steuerschlitzformgebung, so daß im Leerlauf die Kraftstoffzufuhr zu den Zylindereinspritzventilen blockiert und zum Zentraleinspritzventil geöffnet ist, während bei einer Verschiebung des Steuerkolbens des Kraftstoffmengenteilers durch den Luftmengenmesser, die bei Lastzuständen auftritt, die Zuführungen zu den Zylindereinspritzventilen freigegeben werden, während die Zufuhr zu dem Zentraleinspritzventil geschlossen werden kann.In the case of the fuel quantity divider known from the prior art, which works with control slots, an additional control slot is provided for the central injection valve. This flow divider, which controls the cylinder injectors at the same time, is given a corresponding control slot shape, so that, when idling, the fuel supply to the cylinder injectors is blocked and opened to the central injection valve, while when the control piston of the fuel quantity divider is displaced by the air quantity meter, which occurs under load conditions, the supply lines are closed are released to the cylinder injectors while the supply to the central injector can be closed.

Somit wird unter den Lastzuständen, unter denen eine größere Kraftstoffmenge erforderlich ist, diese Kraftstoffmenge, wie bisher, über die Zylindereinspritzventile dezentral den einzelnen Zylindern zugeführt.Thus, under the load conditions under which a larger amount of fuel is required, this amount of fuel is, as before, supplied decentrally to the individual cylinders via the cylinder injection valves.

Aus der DE-OS 27 37 849 ist die Kombination einer Zentraleinspritzung mit einer dezentralisierten Einspritzung bekannt, dort allerdings wird vorgeschlagen, für niedrige Lastzustände die dezentralisierte Einspritzung zu verwenden, und vor einem Abgasturbolader für höhere Lastzustände zentralisiert einzuspritzen, um eine bessere Verwirbelung durch die Arbeit des Abgasturboladers zu haben und somit den Zylindern ein besseres Kraftstoff-Luft-Gemisch zur Verfügung zu stellen. Der Vorschlag, den Leerlauf der Brennkraftmaschine durch eine Zentraleinspritzung zu verbessern, ist der DE-OS 27 37 849 nicht zu entnehmen.From DE-OS 27 37 849 the combination of a central injection with a decentralized injection is known, but it is proposed to use the decentralized injection for low load conditions, and to centralize injection in front of an exhaust gas turbocharger for higher load conditions in order to improve turbulence through work of the exhaust gas turbocharger and thus to provide the cylinders with a better fuel-air mixture. The proposal to improve the idling of the internal combustion engine by means of a central injection cannot be found in DE-OS 27 37 849.

In bevorzugter Ausführungsform sind die Zylindereinspritzventile im Leerlauf vollständig geschlossen, so daß die Kraftstoffversorgung allein durch das Zentraleinspritzventil erfolgt. Damit kann die Abstimmung des Leerlaufes exakt erfolgen.In a preferred embodiment, the cylinder injection valves are completely closed when idling, so that the fuel supply takes place solely through the central injection valve. This allows the idling to be coordinated exactly.

Bei höheren Drehzahlen bzw. höheren Lastzuständen der Brennkraftmaschine kann das Zentraleinspritzventil, das die Leerlaufversorgung sicherstellt, mitlaufen. Bevorzugt jedoch wird das Zentraleinspritzventil bei höheren Lastzuständen, wenn die Zylindereinspritzventile in Aktion treten, abgeschaltet.At higher speeds or higher load conditions of the internal combustion engine, the central injection valve, which ensures the idle supply, can run along. However, the central injection valve is preferably switched off at higher load states when the cylinder injection valves come into action.

Um im Rahmen einer λ- Regelung das Gemisch anzufetten bzw. abzumagern, kann das Zentraleinspritzventil auch unter Teil- und Volllastbedingungen mitlaufen und zur Einhaltung des stöchiometrischen Verhältnisses geregelt werden, während die Zylindereinspritzventile nicht mitgeregelt zu werden brauchen. Die Ä-Regeiung kann somit baulich mit verringertem Aufwand verwirklicht werden, da allein das Zentraleinspritzventil über die Regelung angesteuert wird.In order to enrich or lean the mixture as part of a λ control, the central injection valve can also run under partial and full load conditions and can be controlled to maintain the stoichiometric ratio, while the cylinder injection valves do not need to be controlled as well. The AE control can thus be implemented structurally with reduced effort, since only the central injection valve is controlled by the control.

Im folgenden wird die Erfindung anhand der Zeichnung dargestellt. Es zeigen:

  • Fig. 1 eine Prinzipskizze; und
  • Fig. 2a-c verschiedene Stellungen des Steuerkolbens im Kraftstoffmengenteiler.
The invention is illustrated below with the aid of the drawing. Show it:
  • Fig. 1 is a schematic diagram; and
  • 2a-c different positions of the control piston in the fuel quantity divider.

In Fig. 1 ist mit 10 ein Zylinder einer Brennkraftmaschine bezeichnet, der eine Einlaßöffnung besitzt, durch die ein Einlaßventil 12 im geöffneten Zustand ein Kraftstoff-Luft-Gemisch eintreten läßt. Zu dem Zylinder hin führt ein Saugrohr, das einen Abschnitt 14 aufweist, durch den Luft zugeführt wird, die sich dann vor den einzelnen Zylindern in Abschnitten 16 auf die einzelnen Zylinder aufteilt. Im Abschnitt 16, also in den jeden Zylindern 12 individuell zugeordneten Abschnitten, liegt direkt vor dem Einlaßventil 12 ein Einspritzventil 17, das über eine Leitung 36 zugeführten Kraftstoff vor das Einlaßventil spritzt.In Fig. 1, 10 denotes a cylinder of an internal combustion engine which has an inlet opening through which an inlet valve 12 in the open state allows a fuel-air mixture to enter. A suction pipe, which has a section 14, leads through to the cylinder, through which air is supplied, which is then divided into sections 16 in front of the individual cylinders. In section 16, that is to say in the sections individually assigned to each cylinder 12, there is an injection directly in front of the inlet valve 12 valve 17, which injects fuel via a line 36 upstream of the inlet valve.

Durch eine Drosselklappe 18 wird die von einer Lufteintrittsöffnung 20 angesaugte Luftmenge gesteuert.The amount of air sucked in by an air inlet opening 20 is controlled by a throttle valve 18.

Der Vollständigkeit halber ist ein Kaltstartventil 32 dargestellt, das in bekannter Weise für eine Kaltstartanreicherung sorgt, indem über eine Leitung 30 zugeführter Kraftstoff in das Saugrohr gespritzt wird.For the sake of completeness, a cold start valve 32 is shown, which provides a cold start enrichment in a known manner by injecting fuel supplied via a line 30 into the intake manifold.

Zur Zuteilung des Kraftstoffes zu den Zylindereinspritzdüsen 17 ist eine Gemischregeleinrichtung 22 vorgesehen, die in großer Zahl serienmäßig verbaut wird und Stand der Technik ist. Diese Gemischregelanlage 22 besitzt in bekannter Weise einen Luftmengenmesser 24, der durch eine Stauscheibe gebildet wird. Der Ausschlag des Luftmengenmessers 24 steuert die über die Leitung 36 dem Zylindereinspritzventil 17 zugeführte Kraftstoffmenge.To allocate the fuel to the cylinder injection nozzles 17, a mixture control device 22 is provided, which is installed in large numbers in series and is state of the art. This mixture control system 22 has an air flow meter 24, which is formed by a baffle plate, in a known manner. The deflection of the air flow meter 24 controls the amount of fuel supplied to the cylinder injection valve 17 via the line 36.

Erfindungsgemäß ist vorgesehen, daß im Saugrohrabschnitt 14, also in dem Saugrohrabschnitt, der allen Zylindern gemeinsam ist, ein Einspritzventil 44 zur Zentraleinspritzung von Kraftstoff vorgesehen ist. Der optimale Anbringungsort liegt direkt hinter der Drosselklappe, wo die Verwirbelung der angesaugten Luft groß ist und somit eine gute Vermischung gewährleistet ist. Ideal ist die Einspritzung direkt an der stromabwärtsgelegenen Mündung des die Drosselklappe umgehenden Bypasses für den Leerlauf. Das Zentraleinspritzventil 44 ist über eine Kraftstoffleitung 42 mit einer Zumeßkammer in der Gemischregelanlage verbunden. Die Steuerung der Kraftstoffmengen zu den Zylindereinspritzventilen 17 und dem Zentraleinspritzventil 44 geschieht über einen Kraftstoffmengenteiler 40, der im einzelnen in Fig. 2 dargestellt ist.According to the invention, it is provided that an injection valve 44 for central injection of fuel is provided in the intake manifold section 14, that is to say in the intake manifold section which is common to all cylinders. The optimal location is directly behind the throttle valve, where the swirling of the intake air is large and good mixing is guaranteed. The injection directly at the downstream mouth of the bypass bypassing the throttle valve is ideal for idling. The central injection valve 44 is connected via a fuel line 42 to a metering chamber in the mixture control system. The fuel quantities to the cylinder injection valves 17 and the central injection valve 44 are controlled via a fuel quantity divider 40, which is shown in detail in FIG. 2.

Der Kraftstoffmengenteiler 40 enthält ein Steuerkolben 58, der in einer zylindrischen Bohrung 54 in einem Gehäuse 52 axial bewegbar ist. Von der einen Seite wird der Kolben 58 mit einem Systemdruck 56 beaufschlagt, von der anderen Seite wird der Kolben durch den Luftmengenmesser in Axialrichtung angehoben oder abgesenkt. Der Kolben besitzt im oberen und unteren Bereich einen Bund 60 bzw. 62, die jeweils abdichtend in der Bohrung 54 abschließen. Zwischen den beiden Bünden 60 und 62 hat der Kolben 58 geringeren Durchmesser.The fuel quantity divider 40 contains a control piston 58 which is axially movable in a cylindrical bore 54 in a housing 52. A system pressure 56 is applied to the piston 58 from one side, and the piston is raised or lowered in the axial direction by the air flow meter from the other side. The piston has a collar 60 and 62 in the upper and lower region, each of which seals in the bore 54. The piston 58 has a smaller diameter between the two collars 60 and 62.

Eine Kraftstoffzuleitung 64 mündet in die Bohrung 54 im Bereich des geringeren Durchmessers, ein Kraftstoffabfluß 66, der in die Leitung 36 für das Zylindereinspritzventil 17 mündet, führt aus der Bohrung 54 weg. Je nach Stellung, wie es in den Figuren 2a-2c dargestellt ist, verschließt der Bund 60 die Kraftstoffabflußleitung 66 vollständig oder gibt sie in wachsendem Ausmaß frei. Damit wird durch das Anheben des Steuerkolbens von der Kraftstoffzuleitung 64 in die Öffnung zur Kraftstoffableitung 66, die zu den Einspritzventilen 17 führt, zunehmend Kraftstoff geführt.A fuel supply line 64 opens into the bore 54 in the region of the smaller diameter, a fuel outflow 66 which opens into the line 36 for the cylinder injection valve 17 leads away from the bore 54. Depending on the position, as shown in FIGS. 2a-2c, the collar 60 closes the fuel drain line 66 completely or releases it to an increasing extent. As a result of the lifting of the control piston from the fuel supply line 64 into the opening to the fuel discharge line 66, which leads to the injection valves 17, fuel is increasingly supplied.

Die bisher geschilderte Ausbildung des Kraftstoffmengenteiles ist Stand der Technik.The previously described formation of the fuel quantity part is state of the art.

Die Leitung 42, die zu dem Zentraleinspritzventil 44 führt, ist im Kraftstoffmengenteiler mit dem Anschluß 68 verbunden, der durch den Bund 60 wahlweise je nach Stellung des Steuerkolbens. geöffnet werden kann. Dabei ist in dem Bund 60 ein Einschnitt 72 vorgesehen, der sicherstellt, daß auch in der Leerlaufstellung des Steuerkolbens die Leitung 68 mit Kraftstoff versorgt wird.The line 42, which leads to the central injection valve 44, is connected in the fuel quantity divider to the connection 68, which through the collar 60 is optionally dependent on the position of the control piston. can be opened. An incision 72 is provided in the collar 60, which ensures that the line 68 is supplied with fuel even in the idle position of the control piston.

die Zuleitung 65 für das Zentraleinspritzventil wird durch einen Vorsprung 70 des Bundes 62 geöffnet oder verschlossen, je nach Stellung des Steuerkolbens, wobei in der Leerlaufstellung der Zulauf 65 teilweise frei ist, so daß er mit dem Ablauf 68 verbunden ist.the feed line 65 for the central injection valve is opened or closed by a projection 70 of the collar 62, depending on the position of the control piston, the inlet 65 being partially free in the idle position, so that it is connected to the outlet 68.

Fig. 2b zeigt die Stellung des Steuerkolbens bei Teillast, es ist deutlich erkennbar, daß der Vorsprung 70 in diesem Falle den Zulauf 65 zumindest bei größerem Anheben des Steuerkolbens bereits vollständig sperrt, so daß das Zentraleinspritzventil 44 keinen Kraftstoff mehr erhält. In bekannter Weise werden die Zylindereinspritzventile nunmehr mit der Kraftstoffversorgung verbunden, und in der Vollaststellung, wie sie in 2c dargestellt ist, strömt noch mehr Kraftstoff zu den Zylindereinspritzventilen 17.Fig. 2b shows the position of the control piston at partial load, it can be clearly seen that the projection 70 in this case already completely blocks the inlet 65 when the control piston is raised so that the central injection valve 44 no longer receives any fuel. In a known manner, the cylinder injection valves are now connected to the fuel supply, and in the full-load position, as shown in FIG. 2 c, even more fuel flows to the cylinder injection valves 17.

Sowohl in der Stellung des Steuerkolbens nach Fig. 2b als auch in der Stellung nach Fig. 2c wird das Zentraleinspritzventil 44 nicht mehr über die Leitung 68 versorgt, da der Zulauf zur Leitung 68, der über die Leitung 65 und die Bohrung 54 führt, durch den Vorsprung 70 des Bundes 62 gesperrt ist.Both in the position of the control piston according to FIG. 2b and in the position according to FIG. 2c, the central injection valve 44 is no longer supplied via line 68, since the inlet to line 68, which leads via line 65 and bore 54, through the projection 70 of the federal government 62 is blocked.

Es ist natürlich denkbar, den Steuerschlitz für das Zentraleinspritzventil so auszulegen, daß das Zentraleinspritzventil auch unter Teil- und Vollast mitläuft.It is of course conceivable to design the control slot for the central injection valve so that the central injection valve also runs under partial and full load.

Zumindest im Teillastbereich ist ein passives Überschneiden des Zentraleinspritzbetriebs und des Zylinderbetriebs wünschenswert.At least in the partial load range, a passive overlap of the central injection mode and the cylinder mode is desirable.

Claims (5)

1. Mechanical fuel injection for an internal combustion engine having a fuel pump, a fuel accumulator, a mixture regulator (22) with fuel distributor (40) which opens a fuel supply to injection valves (17, 32, 44) by means of a displacement, controlled by the airflow sensor (24), through built-in metering slits, a cylinder injection valve (17) being associated with each cylinder of the internal combustion engine, having a central injection valve (32) for the cold-start enrichment and an airflow sensor (24) associated with the mixture regulator, said airflow sensor controlling the fuel distributor (40), characterized in that a further fuel central injection valve (44) is provided in a suction tube section (14) common to all cylinders, of the internal combustion engine, said suction tube section being supplied in the idling mode with a predeterminable amount of fuel, and in that the metering slits for the cylinder injection- valves (17) are comletely closed in the idling mode and an additional metering slit for the central injection valve (44) is provided, said metering slit opening at least in the idling mode.
2. Fuel injection according to Claim 1, characterized in that the central injection valve (44) is arranged downstream of the throttle valve (18) in the immediate vicinity of the same.
3. Fuel injection according to Claim 2, characterized in that the central injection valve (44) is arranged in the immediate vicinity of the idling bypass for the throttle valve.
4. Fuel injection according to one of Claims 1 to 4, characterized in that, in V engines, in each case one central injection valve is provided in each of the two mixture feed branches.
5. Use of the fuel injection according to one of Claims 1 to 4 for controlling the stoichiometric ratio of the fuel/air mixture, the central injection valve being actuated.
EP86101722A 1985-03-08 1986-02-11 Mechanical fuel injection Expired - Lifetime EP0193754B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86101722T ATE57423T1 (en) 1985-03-08 1986-02-11 MECHANICAL FUEL INJECTION.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3508224 1985-03-08
DE19853508224 DE3508224A1 (en) 1985-03-08 1985-03-08 MECHANICAL FUEL INJECTION

Publications (3)

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EP0193754A2 EP0193754A2 (en) 1986-09-10
EP0193754A3 EP0193754A3 (en) 1989-05-10
EP0193754B1 true EP0193754B1 (en) 1990-10-10

Family

ID=6264561

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86101722A Expired - Lifetime EP0193754B1 (en) 1985-03-08 1986-02-11 Mechanical fuel injection

Country Status (3)

Country Link
EP (1) EP0193754B1 (en)
AT (1) ATE57423T1 (en)
DE (1) DE3508224A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006079172A1 (en) * 2005-01-27 2006-08-03 Orbital Engine Company (Australia) Pty Limited Fuel injection system for internal combustion engine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4418672A (en) * 1980-03-06 1983-12-06 Robert Bosch Gmbh Fuel supply system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1229914A (en) * 1967-09-04 1971-04-28
DE2337198C2 (en) * 1973-07-21 1981-09-17 Robert Bosch Gmbh, 7000 Stuttgart Device for reducing the harmful components of the exhaust gas
DE2737849C2 (en) * 1977-08-23 1984-11-29 Volkswagenwerk Ag, 3180 Wolfsburg Multi-cylinder Otto internal combustion engine
DE3344596C2 (en) * 1983-12-09 1985-11-14 Daimler-Benz Ag, 7000 Stuttgart Fuel injection system for mixture-compressing, spark-ignited internal combustion engines
DE3511997A1 (en) * 1985-04-02 1986-10-09 Volkswagen AG, 3180 Wolfsburg Arrangement for vehicles, especially passenger motor vehicles

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4418672A (en) * 1980-03-06 1983-12-06 Robert Bosch Gmbh Fuel supply system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
AUTOMOBILTECHNISCHE ZEITSCHRIFT, Band 75, Nr. 11, November 1973, Seiten 393-398, Stuttgart, R. Schwartz et al.: "K-Jetronic-kontinuierliche Benzineinspritzung von Bosch" *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006079172A1 (en) * 2005-01-27 2006-08-03 Orbital Engine Company (Australia) Pty Limited Fuel injection system for internal combustion engine

Also Published As

Publication number Publication date
EP0193754A3 (en) 1989-05-10
EP0193754A2 (en) 1986-09-10
DE3508224C2 (en) 1987-02-05
ATE57423T1 (en) 1990-10-15
DE3508224A1 (en) 1986-09-11

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