EP0590362B1 - Cam drive arrangement for driving the pump piston of an injector pump of a four-stroke internal combustion engine - Google Patents

Cam drive arrangement for driving the pump piston of an injector pump of a four-stroke internal combustion engine Download PDF

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Publication number
EP0590362B1
EP0590362B1 EP93114386A EP93114386A EP0590362B1 EP 0590362 B1 EP0590362 B1 EP 0590362B1 EP 93114386 A EP93114386 A EP 93114386A EP 93114386 A EP93114386 A EP 93114386A EP 0590362 B1 EP0590362 B1 EP 0590362B1
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EP
European Patent Office
Prior art keywords
fuel
control
pump
injection
crankshaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP93114386A
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German (de)
French (fr)
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EP0590362A1 (en
Inventor
Helmut Dipl.-Ing. Priesner
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MAN Truck and Bus Osterreich AG
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Steyr Nutzfahrzeuge AG
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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
    • F02M39/00—Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements
    • F02M39/02—Arrangements of fuel-injection apparatus to facilitate the driving of pumps; Arrangements of fuel-injection pumps; Pump drives
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/102—Mechanical drive, e.g. tappets or cams
    • 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
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four
    • 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

Definitions

  • the invention relates to the control of the fuel injection of a multi-cylinder 4-stroke internal combustion engine with features of the type specified in the preamble of claim 1.
  • a high-pressure pump of any type is used there as a fuel delivery device, which delivers fuel into a distributor from which all the injection valves connected via injection lines can be supplied with fuel.
  • the time and quantity control for the injections and the supply of the fuel to the individual injection valves is carried out via several solenoid valves which are appropriately controlled by a control device. One of them closes or opens a short-circuit line between the distributor and the fuel tank, while the other solenoid valves are installed in the injection lines.
  • the drive shaft responsible for controlling the pump pistons always runs at half the engine speed.
  • FIGS. 1 and 2 for better comparison, the same or corresponding parts are drawn with the same reference numerals for the sake of a better comparison.
  • the cylinder head with 1 As parts of the multi-cylinder 4-stroke internal combustion engine, which is in particular a diesel engine, the cylinder head with 1, the engine housing with 2, the crankcase with 3, the crankshaft with 4, the cylinder with 5, and the pistons acting therein, connected to the crankshaft 4 via piston rods 6 are designated by 7. With 8 injection valves are designated, which inject the fuel directly into the combustion chambers 9 and are each connected to an injection pump 11 via a fuel pressure line 10.
  • the injection pump 11 is used in the form of a plug-in pump which is installed in a shaft 12 of the laterally correspondingly enlarged motor housing and whose pump pistons can be actuated by control cams 13 which are provided on a camshaft 14 arranged below the plug-in pump 11 .
  • This camshaft can be driven by the crankshaft 4 via its own control drive, which is indicated by the sub-circles 15, 16, in a ratio of 1: 2, ie with every second crankshaft revolution a certain amount of fuel is injected into a combustion chamber 8 at a specific point in time 9 injected.
  • the camshaft 14 and the associated control drive 15, 16 of the known internal combustion engine can be omitted because the control cams 17 and the associated base circle (s) 20 are provided directly on the crankshaft 4 of the internal combustion engine .
  • these control cams 17 provided on crankshaft 4 must be assigned an injection pump of the type whose delivery is controlled by solenoid valves.
  • the solenoid valves 22, 23 and 24, 25, 26 are controlled by an electronic, computer-assisted regulating and control device 19, which has a microprocessor, data and program memory and an input and output periphery, which components are internal by means of a corresponding data bus system are linked together.
  • the regulating and control device 19 continuously receives the sensor-detected rotation angle ⁇ of the crankshaft 4 as a control reference signal, on the basis of which the control of the existing solenoid valves is also regulated in the sense of variable control times by means of a program.
  • a control cam 17 for controlling an associated pump piston of the injection pump 11 is necessary on the camshaft 4 for the fuel supply to two injection valves 8, but injection into one cylinder 5 is only carried out every second crankshaft revolution.
  • one solenoid valve 22 can be switched from delivery to one cylinder, for example cylinder Z1, to delivery to another, for example cylinder Z4.
  • a cam 17 on the crankshaft side and a pump piston (as schematically shown in FIG. 3)
  • two engine cylinders can therefore be supplied with fuel.
  • the solenoid valve 23 is delivering the fuel controls, the solenoid valve 22 alternately branches the delivered fuel to two engine cylinders 5. This means that an injection pump 11 with only two pump pistons, each with two solenoid valves 22 and two solenoid valves 23, is necessary for fuel injection, for example, a 4-cylinder in-line engine.
  • Fig. 4 shows such an example for a 4-cylinder in-line engine.
  • two cams 17 are arranged on the circumference of the crankshaft 4 offset from one another by 180 °.
  • This configuration makes an injection pump 11 with only one pump piston and the three solenoid valves 24, 25, 26 necessary for the fuel supply to four cylinders 5.
  • the solenoid valve 26 controls the delivery of the fuel, the solenoid valve 25 distributes the delivery to a pair of cylinders and the solenoid valve 24 distributes the delivery to the four cylinders alternately.
  • the control cams 17 and the associated base circle (s) 20 can either be realized by appropriate shaping of crank cheek peripheral surfaces or on a control sleeve or a plurality of control disks which are or are fixedly attached to the crankshaft 4 inside or outside.
  • the control sleeve or the control disk (s) can be arranged outside the engine on a shaft section of the crankshaft 4 protruding there at the end, which allows smaller base circle diameters and also a fixed assignment of a normal injection pump equipped with the solenoid valves on the end of the engine.
  • control cams 17 and the associated base circle (s) 20 are realized on crankshaft circumferential surfaces or are provided on control disks or a control sleeve attached to the crankshaft 4 within the engine, as shown in FIG. 1 can be seen - an insertion pump 11 for use, which is installed in an insertion shaft 21 opening into the interior of the crankcase 3.

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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)

Description

Die Erfindung betrifft die Steuerung der Kraftstoffeinspritzung einer mehrzylindrigen 4-Takt-Brennkraftmaschine mit Merkmalen der im Oberbegriff des Anspruches 1 angegebenen Art.The invention relates to the control of the fuel injection of a multi-cylinder 4-stroke internal combustion engine with features of the type specified in the preamble of claim 1.

Die Erfindung geht aus von der Lehre der EP 0 462 404 A1. Dort kommt eine Hochdruckpumpe beliebigen Typs als Kraftstofförderorgan zur Anwendung, die Kraftstoff in einen Verteiler fördert, von dem aus alle über Einspritzleitungen angeschlossenen Einspritzventile mit Kraftstoff versorgbar sind. Die Zeit- und Mengensteuerung für die Einspritzungen sowie die Zuleitung des Kraftstoffes zu den einzelnen Einspritzventilen erfolgt über mehrere, von einer Steuereinrichtung aus entsprechend gesteuerte Magnetventile. Eines davon schließt bzw. öffnet eine Kurzschlußleitung zwischen Verteiler und Kraftstofftank, während die anderen Magnetventile in die Einspritzleitungen eingebaut sind.The invention is based on the teaching of EP 0 462 404 A1. A high-pressure pump of any type is used there as a fuel delivery device, which delivers fuel into a distributor from which all the injection valves connected via injection lines can be supplied with fuel. The time and quantity control for the injections and the supply of the fuel to the individual injection valves is carried out via several solenoid valves which are appropriately controlled by a control device. One of them closes or opens a short-circuit line between the distributor and the fuel tank, while the other solenoid valves are installed in the injection lines.

Darüber hinaus ist es aus der JP-A-63 201 370 bekannt, bei einer 2-Takt-Brennkraftmaschine zur Steuerung der Pumpenkolben einer Einspritzpumpe davon beabstandete eigenständige Pumpenkolben vorzusehen, die gleichmäßig um die Kurbelwelle der Brennkraftmaschine angeordnet und alle von einem einzigen Nocken aus betätigt werden. Diese Pumpenkolben wirken über in ausgangsseitig angeschlossenen Druckleitungen gegebene Schmierölsäulen hydraulisch auf die Einspritzpumpenkolben ein. Auf eine 4-Takt-Brennkraftmaschine ist diese Steuerungsart nicht übertragbar, denn diese benötigt üblicherweise eine Einspritzanlage, mit der nur bei jeder zweiten Kurbelwellenumdrehung - also jeweils nach 720° Kurbelwinkel - zu einem bestimmten Zeitpunkt eine bestimmte Kraftstoffmenge in einen Brennraum eingespritztwird. Bekannt sind hierfür folgende Konzepte:

  • 1. Einspritzpumpen mit einer eigenen Nockenwelle oder Nockenscheibe (Reihen- und Verteilerpumpen),
  • 2. Pumpendüsen oder Einsteckpumpen, deren Pumpenkolben von zusätzlich an einer Motornockenwelle angeordneten Einspritznocken getätigt werden, und
  • 3. Pumpendüsen oder Einsteckpumpen, deren Pumpenkolben von einer nur Einspritznocken aufweisenden separaten Nockenwelle im Motor betätigt werden.
In addition, it is known from JP-A-63 201 370 to provide, in a 2-stroke internal combustion engine for controlling the pump pistons of an injection pump, separate pump pistons spaced apart therefrom, which are arranged uniformly around the crankshaft of the internal combustion engine and all actuated from a single cam become. These pump pistons act hydraulically on the injection pump pistons via lubricating oil columns in the pressure lines connected on the outlet side. This type of control is not transferable to a 4-stroke internal combustion engine, because it usually requires an injection system with which a certain amount of fuel is injected into a combustion chamber only at every second crankshaft revolution - i.e. every 720 ° crank angle - at a certain point in time. The following concepts are known for this:
  • 1. injection pumps with their own camshaft or cam disc (in-line and distributor pumps),
  • 2. Pump nozzles or plug-in pumps, the pump pistons of which are actuated by injection cams additionally arranged on an engine camshaft, and
  • 3. Pump nozzles or plug-in pumps, the pump pistons of which are actuated by a separate camshaft in the engine which has only injection cams.

Die für die Steuerung der Pumpenkolben zuständige Antriebswelle läuft dabei immer mit halber Motordrehzahl.The drive shaft responsible for controlling the pump pistons always runs at half the engine speed.

Es ist demgegenüber Aufgabe der Erfindung, eine Steuerung der gattungsgemäßen Art so zu verbessern, daß für die Kraftstoffeinspritzung ein geringerer Steuerungs- und Regelungsaufwand notwendig ist.In contrast, it is an object of the invention to improve a control of the generic type in such a way that less control and regulation effort is required for fuel injection.

Diese Aufgabe ist erfindungsgemäß durch eine Steuerung mit Merkmalen der im Anspruch 1 angegebenen Art gelöst.This object is achieved by a control with features of the type specified in claim 1.

Vorteilhafte Ausgestaltungen und Weiterbildungen dieser Lösung sind in den Unteransprüchen gekennzeichnet.Advantageous refinements and developments of this solution are characterized in the subclaims.

Aufgrund der erfindungsgemäßen Lösung ergeben sich folgende Vorteile:

  • 1. Entfall eines gesonderten Einspritzpumpenantriebes.
  • 2. Durch die größere Drehzahl und den größeren Nockengrundkreis lassen sich erheblich höhere Fördergeschwindigkeiten erreichen.
  • 3. Die Drehschwingungs- und Geräuschanregung ist wesentlich geringer als bei bekannten Konzepten.
  • 4. Die Nockenform ist wegen der großen Radien und damit geringen Hertz'schen Pressung über den vollen Kolbenhub nutzbar.
  • 5. Es ergibt sich eine Herstellkostenreduzierung für die Brennkraftmaschine aufgrund des Entfalls eines gesonderten Einspritzpumpenantriebes.
The following advantages result from the solution according to the invention:
  • 1. Elimination of a separate injection pump drive.
  • 2. Due to the higher speed and the larger cam base circle, significantly higher conveying speeds can be achieved.
  • 3. The torsional vibration and noise excitation is significantly less than with known concepts.
  • 4. The cam shape can be used over the full piston stroke because of the large radii and thus low Hertzian pressure.
  • 5. There is a reduction in manufacturing costs for the internal combustion engine due to the elimination of a separate injection pump drive.

Nachstehend ist die erfindungsgemäße Lösung anhand der Zeichnung noch näher erläutert. In der Zeichnung zeigen:

Fig. 1
schematisch eine 4-Takt-Brennkraftmaschine zur Verdeutlichung des erfindungsgemäßen Grundprinzipes,
Fig. 2
zum Vergleich hierzu eine 4-Takt-Brennkraftmaschine bekannter Bauart,
Fig. 3
schematisch eine Ausführungsform der Erfindung für eine 2-zylindrige 4-Takt-Brennkraftmaschine, und
Fig. 4
schematisch eine Ausführungsform der Erfindung für eine 4-zylindrige 4-Takt-Brennkraftmaschine.
The solution according to the invention is explained in more detail below with reference to the drawing. The drawing shows:
Fig. 1
schematically a 4-stroke internal combustion engine to illustrate the basic principle of the invention,
Fig. 2
for comparison, a 4-stroke internal combustion engine of known design,
Fig. 3
schematically an embodiment of the invention for a 2-cylinder 4-stroke internal combustion engine, and
Fig. 4
schematically an embodiment of the invention for a 4-cylinder 4-stroke internal combustion engine.

In Figuren 1 und 2 sind des besseren Vergleiches wegen gleiche bzw. einander entsprechende Teile mit gleichen Bezugszeichen angezogen.In FIGS. 1 and 2, for better comparison, the same or corresponding parts are drawn with the same reference numerals for the sake of a better comparison.

Als Teile der mehrzylindrigen 4-Takt-Brennkraftmaschine, bei der es sich insbesondere um einen Dieselmotor handelt, sind in der Zeichnung der Zylinderkopf mit 1, das Motorgehäuse mit 2, das Kurbelgehäuse mit 3, die Kurbelwelle mit 4, die Zylinder mit 5, und die darin wirkenden, über Kolbenstangen 6 an der Kurbelwelle 4 angeschlossenen Kolben mit 7 bezeichnet. Mit 8 sind Einspritzventile bezeichnet, die den Kraftstoff direkt in die Brennräume 9 einspritzen und jeweils über eine Kraftstoffdruckleitung 10 mit einer Einspritzpumpe 11 verbunden sind.As parts of the multi-cylinder 4-stroke internal combustion engine, which is in particular a diesel engine, the cylinder head with 1, the engine housing with 2, the crankcase with 3, the crankshaft with 4, the cylinder with 5, and the pistons acting therein, connected to the crankshaft 4 via piston rods 6 are designated by 7. With 8 injection valves are designated, which inject the fuel directly into the combustion chambers 9 and are each connected to an injection pump 11 via a fuel pressure line 10.

Im Vergleichsbeispiel gemäß Fig. 2 kommt die Einspritzpumpe 11 in Form einer Einsteckpumpe zur Anwendung, die in einen Schacht 12 des seitlich entsprechend erweiterten Motorgehäuses eingebaut ist und deren Pumpenkolben durch Steuernocken 13 betätigbar sind, die an einer unterhalb der Einsteckpumpe 11 angeordneten Nockenwelle 14 gegeben sind. Diese Nockenwelle ist von der Kurbelwelle 4 her über einen eigenen Steuertrieb, der durch die Teilkreise 15, 16 angedeutet ist, im Verhältnis 1 : 2 antreibbar, d.h. bei jeder zweiten Kurbelwellenumdrehung wird zu einem bestimmten Zeitpunkt eine bestimmte Kraftstoffmenge über ein Einspritzventil 8 in einen Brennraum 9 eingespritzt.In the comparative example according to FIG. 2, the injection pump 11 is used in the form of a plug-in pump which is installed in a shaft 12 of the laterally correspondingly enlarged motor housing and whose pump pistons can be actuated by control cams 13 which are provided on a camshaft 14 arranged below the plug-in pump 11 . This camshaft can be driven by the crankshaft 4 via its own control drive, which is indicated by the sub-circles 15, 16, in a ratio of 1: 2, ie with every second crankshaft revolution a certain amount of fuel is injected into a combustion chamber 8 at a specific point in time 9 injected.

Im Vergleich hierzu kann bei der erfindungsgemäßen Lösung die Nockenwelle 14 und der zugehörige Steuerungstrieb 15, 16 der bekannten Brennkraftmaschine deswegen entfallen, weil die Steuernocken 17 und der/die zugehörige(n) Grundkreis(e) 20 direkt an der Kurbelwelle 4 der Brennkraftmaschine gegeben sind. Da jedoch je Zylinder eine Einspritzung nur bei jeder zweiten Kurbelwellenumdrehung stattfinden darf, muß diesen an der Kurbelwelle 4 gegebenen Steuernocken 17 eine Einspritzpumpe solchen Typs zugeordnet sein, deren Förderung durch Magnetventile gesteuert wird.In comparison, in the solution according to the invention the camshaft 14 and the associated control drive 15, 16 of the known internal combustion engine can be omitted because the control cams 17 and the associated base circle (s) 20 are provided directly on the crankshaft 4 of the internal combustion engine . However, since injection per cylinder may only take place every second crankshaft revolution, these control cams 17 provided on crankshaft 4 must be assigned an injection pump of the type whose delivery is controlled by solenoid valves.

Gemäß der Erfindung sind bei mehrzylindrigen Brennkraftmaschinen im einfachsten Fall (zwei Zylinder 5, siehe Fig. 3) zwei Magnetventile 22, 23 und ein an der Kurbelwelle angeordneter Steuernocken 17, mit dem ein Pumpenkolben der Einspritzpumpe 11 betätigbar ist, zur Einspritzsteuerung notwendig. Noch günstiger sind die Verhältnisse im Fall gemäß Fig. 4, denn dort sind nur eine Pumpe 11 und drei Magnetventile 24, 25, 26 für die Steuerung der Einspritzung in vier Zylinder 5 erforderlich.According to the invention, in multi-cylinder internal combustion engines in the simplest case (two cylinders 5, see FIG. 3) two solenoid valves 22, 23 and a control cam 17 arranged on the crankshaft, with which a pump piston of the injection pump 11 can be actuated, are necessary for the injection control. The situation in the case of FIG. 4 is even more favorable, since only one pump 11 and three solenoid valves 24, 25, 26 are required for controlling the injection into four cylinders 5.

Für die Steuerung der Magnetventile 22, 23 bzw. 24, 25, 26 sorgt eine elektronische, rechnergestützt arbeitende Regel- und Steuereinrichtung 19, die einen Mikroprozessor, Daten- und Programmspeicher sowie eine Ein- und Ausgabeperipherie aufweist, welche Komponenten intern durch ein entsprechendes Datenbussystem miteinander verknüpft sind. Die Regel- und Steuereinrichtung 19 erhält fortlaufend den sensormäßig erfaßten Drehwinkel Φ der Kurbelwelle 4 als Steuerungsbezugssignal zugeführt, anhand dessen per Programm die Steuerung der vorhandenen Magnetventile auch im Sinne variabler Steuerzeiten geregelt wird.The solenoid valves 22, 23 and 24, 25, 26 are controlled by an electronic, computer-assisted regulating and control device 19, which has a microprocessor, data and program memory and an input and output periphery, which components are internal by means of a corresponding data bus system are linked together. The regulating and control device 19 continuously receives the sensor-detected rotation angle Φ of the crankshaft 4 as a control reference signal, on the basis of which the control of the existing solenoid valves is also regulated in the sense of variable control times by means of a program.

Im Fall gemäß Fig. 3 ist an der Nockenwelle 4 für die Kraftstoffversorgung zweier Einspritzventile 8 ein Steuernocken 17 zur Steuerung eines zugehörigen Pumpenkolbens der Einspritzpumpe 11 notwendig, eine Einspritzung in je einen Zylinder 5 erfolgt aber nur bei jeder zweiten Kurbelwellenumdrehung. Von den beiden Magnetventilen 22, 23 ist das eine Magnetventil 22 von Förderung zum einen Zylinder, z.B. Zylinder Z1, auf Förderung zu einem anderen, z.B. Zylinder Z4, umschaltbar. Mit einer kurbelwellenseitigen Nocke 17 und einem Pumpenkolben (wie in Fig. 3 schematisch dargestellt) sind daher zwei Motorzylinder mit Kraftstoff versorgbar. Während das Magnetventil 23 die Förderung des Kraftstoffes steuert, verzweigt das Magnetventil 22 alternierend den geförderten Kraftstoff zu zwei Motorzylindern 5. Dieses bedeutet, daß für die Kraftstoffeinspritzung beispielsweise einer 4-Zylinder-Reihenbrennkraftmaschine eine Einspritzpumpe 11 mit nur zwei Pumpenkolben mit je zwei Magnetventilen 22 und je zwei Magnetventilen 23 notwendig ist.In the case of FIG. 3, a control cam 17 for controlling an associated pump piston of the injection pump 11 is necessary on the camshaft 4 for the fuel supply to two injection valves 8, but injection into one cylinder 5 is only carried out every second crankshaft revolution. Of the two solenoid valves 22, 23, one solenoid valve 22 can be switched from delivery to one cylinder, for example cylinder Z1, to delivery to another, for example cylinder Z4. With a cam 17 on the crankshaft side and a pump piston (as schematically shown in FIG. 3), two engine cylinders can therefore be supplied with fuel. While the solenoid valve 23 is delivering the fuel controls, the solenoid valve 22 alternately branches the delivered fuel to two engine cylinders 5. This means that an injection pump 11 with only two pump pistons, each with two solenoid valves 22 and two solenoid valves 23, is necessary for fuel injection, for example, a 4-cylinder in-line engine.

In Weiterbildung dieser Lösung können mit einem Pumpenkolben aber auch drei, vier oder sechs Zylinder mit Kraftstoff versorgt werden. Fig. 4 zeigt solches beispielhaft für einen 4-Zylinder-Reihenmotor. Hierbei sind zwei Nocken 17 am Umfang der Kurbelwelle 4 um 180° versetzt zueinander angeordnet. Durch diese Konfiguration werden für die Kraftstoffversorgung von vier Zylindern 5 eine Einspritzpumpe 11 mit nur einem Pumpenkolben sowie die drei Magnetventile 24, 25, 26 notwendig. Das Magnetventil 26 steuert die Förderung des Kraftstoffes, das Magnetventil 25 verteilt die Förderung auf ein Zylinderpaar und das Magnetventil 24 verteilt die Förderung auf die vier Zylinder jeweils alternierend.In a further development of this solution, three, four or six cylinders can also be supplied with fuel with a pump piston. Fig. 4 shows such an example for a 4-cylinder in-line engine. Here, two cams 17 are arranged on the circumference of the crankshaft 4 offset from one another by 180 °. This configuration makes an injection pump 11 with only one pump piston and the three solenoid valves 24, 25, 26 necessary for the fuel supply to four cylinders 5. The solenoid valve 26 controls the delivery of the fuel, the solenoid valve 25 distributes the delivery to a pair of cylinders and the solenoid valve 24 distributes the delivery to the four cylinders alternately.

Die Steuernocken 17 und der/die zugehörige(n) Grundkreis(e) 20 können entweder durch entsprechende Formgebung von Kurbelwangen-Umfangsflächen oder an einer Steuerhülse oder mehreren Steuerscheiben realisiert sein, die innerhalb oder außerhalb fest auf der Kurbelwelle 4 befestigt ist bzw. sind. Beispielsweise kann die Steuerhülse bzw. können die Steuerscheibe(n) außerhalb des Motors an einem dort stirnseitig herausragenden Wellenabschnitt der Kurbelwelle 4 angeordnet sein, was kleinere Grundkreis-Durchmesser und auch eine stirnseitig des Motors feste Zuordnung einer normalen, mit den Magnetventilen ausgestatteten Einspritzpumpe erlaubt. Für den Fall, daß die Steuernocken 17 und der/die zugehörige(n) Grundkreis(e) 20 an Kurbelwangen-Umfangsflächen realisiert oder an innerhalb des Motors an der Kurbelwelle 4 befestigten Steuerscheiben bzw. einer Steuerhülse gegeben sind, kommt - wie aus Fig. 1 ersichtlich - eine Einsteckpumpe 11 zur Anwendung, die in einen, in den Innenraum des Kurbelgehäuses 3 ausmündenden Einsteckschacht 21 eingebaut ist.The control cams 17 and the associated base circle (s) 20 can either be realized by appropriate shaping of crank cheek peripheral surfaces or on a control sleeve or a plurality of control disks which are or are fixedly attached to the crankshaft 4 inside or outside. For example, the control sleeve or the control disk (s) can be arranged outside the engine on a shaft section of the crankshaft 4 protruding there at the end, which allows smaller base circle diameters and also a fixed assignment of a normal injection pump equipped with the solenoid valves on the end of the engine. In the event that the control cams 17 and the associated base circle (s) 20 are realized on crankshaft circumferential surfaces or are provided on control disks or a control sleeve attached to the crankshaft 4 within the engine, as shown in FIG. 1 can be seen - an insertion pump 11 for use, which is installed in an insertion shaft 21 opening into the interior of the crankcase 3.

Claims (8)

  1. A control system of the fuel injection system of a multi-cylinder 4-stroke internal combustion engine, in particular of a diesel engine, via one injection valve (8) per machine cylinder (5), wherein the fuel to be injected is delivered by means of cam-controlled pump pistons of an injection pump (11), and the timing and the amount of fuel to be injected and the feeding thereof to the individual injection valves is controlled by solenoid valves (22, 23; 24, 25, 26) correspondingly actuated by regulating and control means (19),
    characterised in that
    the injection pump (11) is arranged adjacent the crankshaft (4) and fuel is delivered therefrom via at least one control cam (17) arranged thereon and directly operating a pump piston of the injection pump (11),
    that the following are required for injecting fuel into the group of several machine cylinders (5),
    a) a pump piston of the injection pump (11),
    b) at least one control cam (17) operating this pump piston at least once for each revolution of the crankshaft,
    c) a solenoid valve (23; 26) controlling the delivery of the fuel by means of this pump piston, and
    d) at least one other solenoid valve (22; 25, 24) for feeding the fuel delivered by this pump piston, alternately, by means of appropriate changing over, to the injection - valves (8) associated with a group of machine cylinders (5) in an order corresponding to the firing order,
    and that electronic, computerised, regulating and control means (19) are provided for controlling all the solenoid valves (22, 23; 24, 25, 26), and has a microprocessor, data and program memory, input and output peripherals, all connected to each other via a data bus system, and also has the angle of rotation (Φ4), detected by sensors, of the crankshaft (4) continuously supplied as a control reference signal, and with the aid thereof also regulates the control system of the solenoid valves (22, 23; 24, 25, 26) by a program so as to bring about variable valve timing.
  2. A control system of the fuel injection system according to Claim 1, characterised in that with internal combustion engines in which the number of cylinders is two or a multiple of two, the following are required to control fuel injection into a respective group with two machine cylinders,
    a) a pump piston of an injection pump (11),
    b) a control cam (17) arranged on the crankshaft (4) and operating this pump piston once for each revolution of the crankshaft, and
    c) two solenoid valves (22, 23),
    wherein the delivery of the fuel by means of this pump piston to the second solenoid valve (22) is controlled by the first solenoid valve (23), and alternate feeding of the fuel delivered to either one of the two injection valves (8) of the machine cylinders (5) associated with the group is controlled by the said second solenoid valve (22).
  3. A control system of the fuel injection system according to Claim 1, characterised in that with internal combustion engines, in which the number of cylinders is four or a multiple of four, the following are required to control fuel injection into a respective group with four machine cylinders (5),
    a) a pump piston of an injection pump (11),
    b) two control cams (17) arranged on the crankshaft (4), and staggered with respect to each other by 180° on the periphery, and used to operate this pump piston twice for each revolution of the crankshaft, and
    c) three solenoid valves (24, 25, 26),
    wherein delivery of the fuel by means of this pump piston to the second solenoid valve (25) is controlled by the first solenoid valve (26), and alternate feeding of the fuel delivered to either one of the two inlets of the third solenoid valve (24) is controlled by the said second solenoid valve (25), and further alternate feeding of the fuel fed to the four injection valves (8) of the four machine cylinders (5) associated with the group is controlled by the said third solenoid valve (24).
  4. A control system of the fuel injection system according to any one of the preceding claims, characterised in that the control cam (s) (17) and the associated base circle(s) (20) are produced by shaping crank web peripheral surfaces correspondingly.
  5. A control system of the fuel injection system according to any one of Claims 1 to 3, characterised in that the control cam(s) (17) and the associated base circle(s) (20) are produced on one or several plate cam(s) secured inside or outside the engine rigidly on the crankshaft (4).
  6. A control system of the fuel injection system according to any one of Claims 1 to 3, characterised in that the control cam(s) (17) and the associated base circle(s) (20) are produced on a control casing secured inside or outside the engine housing (3) rigidly on the crankshaft (4).
  7. A control system of the fuel injection system according to any one of the preceding claims, characterised in that the pump piston(s) operable by the control cams (17) present on the crankshaft is/ are part/ components of a plug-in pump (11) fitted into an insertion shaft (21) extending into the inner chamber of the crank casing (3).
  8. A control system of the fuel injection system according to Claims 5 and 6, characterised in that if the control cam(s) (17) and the associated base circle(s) (20) are arranged on the crankshaft (4) on a section of the crankshaft outside the engine, the injection pump (11) provided with solenoid valves (18 or 22, 23 or 24, 25, 26) is secured to the end face of the engine.
EP93114386A 1992-09-29 1993-09-08 Cam drive arrangement for driving the pump piston of an injector pump of a four-stroke internal combustion engine Expired - Lifetime EP0590362B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT1924/92 1992-09-29
AT192492 1992-09-29

Publications (2)

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EP0590362A1 EP0590362A1 (en) 1994-04-06
EP0590362B1 true EP0590362B1 (en) 1996-10-23

Family

ID=3523969

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93114386A Expired - Lifetime EP0590362B1 (en) 1992-09-29 1993-09-08 Cam drive arrangement for driving the pump piston of an injector pump of a four-stroke internal combustion engine

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EP (1) EP0590362B1 (en)
DE (1) DE59304284D1 (en)

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CN101333935B (en) * 2007-06-26 2010-08-25 粘育珲 Power device

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US6007305A (en) * 1996-12-19 1999-12-28 Caterpillar Inc. Internal combustion engine with integral crankshaft driven pump
DE19654286A1 (en) * 1996-12-27 1998-07-02 Dolmar Gmbh Drive device for a brushcutter
DE19654290A1 (en) * 1996-12-27 1998-07-02 Dolmar Gmbh Driving device for a lawn trimmer
GB2338512A (en) * 1998-06-15 1999-12-22 Caterpillar Inc Reciprocating-piston i.c. engine with integral piston pump
DE102008051931A1 (en) * 2008-10-16 2010-04-22 Continental Automotive Gmbh Injection system for an internal combustion engine
US20120291747A1 (en) * 2010-01-29 2012-11-22 Brp-Powertrain Gmbh & Co. Kg Internal combustion engine fuel supply system
DE102010016356A1 (en) * 2010-04-07 2011-10-13 A. T. Süd GmbH Internal combustion engine with fuel pump
DE102010016357A1 (en) * 2010-04-07 2011-10-13 A. T. Süd GmbH Internal combustion engine with fuel pump
DE102012216594A1 (en) * 2012-09-18 2014-03-20 Robert Bosch Gmbh Internal combustion engine with a crankcase
DE102014223597B4 (en) * 2014-10-08 2019-02-07 Continental Automotive Gmbh Roller for a roller tappet of a high-pressure fuel pump, roller tappet, high-pressure fuel pump and internal combustion engine
GB2540584A (en) * 2015-07-22 2017-01-25 Gm Global Tech Operations Llc Internal combustion engine comprising a fuel unit pump actuated by the crankshaft

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JPS6079159A (en) * 1983-10-07 1985-05-04 Mitsui Eng & Shipbuild Co Ltd Fuel injection type internal-combustion engine
JPS63201370A (en) * 1987-02-18 1988-08-19 Mitsubishi Heavy Ind Ltd Fuel feed device for internal combustion engine
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CN101333935B (en) * 2007-06-26 2010-08-25 粘育珲 Power device

Also Published As

Publication number Publication date
DE59304284D1 (en) 1996-11-28
EP0590362A1 (en) 1994-04-06

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