EP0882180B1 - Distributor type fuel injection pump - Google Patents
Distributor type fuel injection pump Download PDFInfo
- Publication number
- EP0882180B1 EP0882180B1 EP97931698A EP97931698A EP0882180B1 EP 0882180 B1 EP0882180 B1 EP 0882180B1 EP 97931698 A EP97931698 A EP 97931698A EP 97931698 A EP97931698 A EP 97931698A EP 0882180 B1 EP0882180 B1 EP 0882180B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- injection
- pump
- valve
- stroke
- fuel
- 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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Classifications
-
- 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
- F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
- F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
- F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
- F02M45/06—Pumps peculiar thereto
-
- 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
- F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
- F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
- F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
- F02M45/06—Pumps peculiar thereto
- F02M45/063—Delivery stroke of piston being divided into two or more parts, e.g. by using specially shaped cams
-
- 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
- F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
- F02M41/08—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
- F02M41/10—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor
- F02M41/12—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor
-
- 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
- F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
- F02M41/08—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
- F02M41/10—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor
- F02M41/12—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor
- F02M41/123—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor characterised by means for varying fuel delivery or injection timing
- F02M41/125—Variably-timed valves controlling fuel passages
-
- 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
- F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
- F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
- F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
- F02M45/08—Injectors peculiar thereto
- F02M45/083—Having two or more closing springs acting on injection-valve
-
- 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
- F02M59/20—Varying fuel delivery in quantity or timing
- F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
-
- 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
- F02M59/20—Varying fuel delivery in quantity or timing
- F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
- F02M59/366—Valves being actuated electrically
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
- F04B49/225—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves with throttling valves or valves varying the pump inlet opening or the outlet opening
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2203/00—Motor parameters
- F04B2203/02—Motor parameters of rotating electric motors
- F04B2203/0209—Rotational speed
Definitions
- the invention is based on a distributor injection pump the genus of claim 1.
- a distributor injection pump the genus of claim 1.
- Distributor injection pump has a back and forth driven and at the same time rotating pump piston which rotates during its and its pump stroke one of several injection lines, that each lead to a fuel injector Injection brought fuel supplied.
- the electrically controlled Valve which is a solenoid valve, opened briefly, and so on to relieve the pump workspace and the achieved Reduce fuel pressure for a short time. This means that a very fast switching solenoid valve is required a considerable effort on the electrical control and to the design of the valve.
- a special pressure valve in the connection between Pump work space and injector provided at High pressure fuel delivery to the fuel injector in Delivery direction opens and at the end of the injection closes and that is suitable for pressure waves between the Remove the pressure valve and the fuel injection valve and in this area a desired constant pressure to hold during the injection breaks. It is advantageous with a divided fuel injection with a Pre-injection and one main injection per work cycle of the respective cylinder of the internal combustion engine to be supplied for a constant stand pressure in the injection breaks to care.
- the solution according to the invention makes control of a injection divided into a pre and main injection much easier. Through the constructive over the An electrical interruption is omitted Control with interim opening and closing of the electrically controlled valve to interrupt the Injection between pre and main injection and the associated effort.
- the electrically controlled valve also does not need the high switching speed have for precise control of the injection pause between pre and main injection is necessary and can be considerably simpler and smaller than a very special one fast switching valve.
- the use also allows of injectors with divided injection rate an exact controllable injection break.
- FIG. 1 shows a basic illustration of a Fuel injection pump controlled by a solenoid valve and Figure 2 shows a course of the invention Cam track in the form of a cam elevation curve over the Angle of rotation 1
- Embodiment based on a distributor injection pump realized as shown schematically in FIG. 1 is shown. It is a distributor injection pump the axial piston type, even if the object the invention also in other fuel injection pumps is usable such.
- the invention is in a distributor injection pump feasible because here for the supply of the injection valves just a single electrically controlled valve is required and the distribution to the individual Injectors is made using the manifold.
- a pump piston 1 is provided, which in a Cylinder bore 2 is slidably and rotatably arranged and there encloses a pump work space 10 on the front side.
- the pump piston is with a cam 6, the axially downward facing cams 5 of the invention Design has, for. B. no further shown spring, coupled.
- the cam disc turns, in particular in synchronism with the speed of the injection pump powered internal combustion engine from a no further drive shaft shown driven in a known manner, the cam disc under the influence of the spring on a known axially fixed roller ring expires and in the Follow the rotating pump and manifold pistons into one reciprocating promotional and suction movement added.
- Fuel is displaced under high pressure Pump piston with one of several injection lines 7 via a distributor groove 8 in the lateral surface of the pump and Distributor piston in connection.
- the distributor groove is included via a longitudinal channel 9 with the pump workspace connected.
- the injection line runs through a pressure valve 12 to a fuel injection valve 13, the respective Cylinder is assigned to an internal combustion engine.
- the pump work space 10 is supplied with fuel via a suction line 15, which is separated from a suction space 17, which is essentially only shown in dashed lines and enclosed within the housing of the fuel injection pump is supplied.
- the suction chamber receives fuel from a fuel feed pump 18, which is synchronous with the fuel injection pump, z. B. driven by the drive shaft and therefore fuel in speed-dependent quantities promotes in the suction chamber.
- a fuel feed pump 18 which is synchronous with the fuel injection pump, z. B. driven by the drive shaft and therefore fuel in speed-dependent quantities promotes in the suction chamber.
- An additional Pressure control valve 19 is usually the pressure in the suction chamber controlled speed-dependent, if with the help of this Pressure additional functions of the fuel injection pump controlled should be.
- An overflow throttle 22 flows continuously Fuel back to the reservoir 23 so that thereby cooling the injection pump or degassing the Suction chamber is taken care of.
- the suction line 15 leads through Check valve 16 in the pump work space, which Check valve opens towards the pump work area.
- an electrically controlled one Valve 24 is provided which has a bypass line 21 controls to the pressure valve 16 and with its help when opening the valve a connection between the pump work space 10 and suction chamber 17 is made and when the valve is closed the pump work space 10 is closed. That as a solenoid valve symbolized electrically controlled valve 24 is controlled by a control device 25 according to operating parameters controlled in a manner known per se. With enough large flow cross section of the valve 24 can, however Check valve 16 is also omitted. In this case the Pump workspace during the suction stroke only via the electrically controlled valve filled.
- a stroke course of the pump piston over time generate, which is divided into a first area V of starting with the delivery stroke of the piston after a small one Conveying stroke ends in a second area P in which the Piston is then set into a retrograde motion so that high-pressure production is effectively ended and there is an injection break and finally into one third area H, in which the cam flank rises again and the pump piston for further delivery of the main injection quantity shifts.
- the diagram in Figure 2 can also be seen like that electrically controlled valve, e.g. a solenoid valve or also a valve actuated by a piezo to control the Beginning of the pre-injection quantity delivery and at the same time the start of spraying is closed in point FB and only for End of main injection again in point FE is opened.
- the injection is interrupted solely because the cam region P does not have an effective one High pressure funding is possible.
- This constructively Predefined spray pause can mean the duration of the interruption high-pressure injection basically constant kept cam angles occur, especially regardless of the switching speed of the electrically controlled valve and the speed. In individual cases it is also possible to Modify cam shape, in the sense of the desired divided Injection.
- the fuel injection pump of the invention Art supplies injectors that are suitable to inject a divided injection rate and thereby for the pre-injection has a smaller injection cross-section provide as for the main injection.
- injectors are known and do not need further details here to be discribed. For this, e.g. on the DE -C2-36 06 246 referenced. With the help of such Trained injection valves can be much more precise the required injection pause between pre and main injection be respected.
Description
Die Erfindung geht von einer Verteilereinspritzpumpe gemäß
der Gattung des Patentanspruchs 1 aus. Eine solche,
durch die DE-A-36 44 257 bekannte
Verteilereinspritzpumpe hat
einen hin- und hergehend angetriebenen und zugleich
rotierenden Pumpenkolben, der bei seiner Drehbewegung und
seinem Pumphub jeweils eine von mehreren Einspritzleitungen,
die zu je einem Kraftstoffeinspritzventil führen, mit auf
Einspritzdruck gebrachtem Kraftstoff versorgt. Zur
Unterteilung der Einspritzung in eine Voreinspritzung und
eine Haupteinspritzung wird das elektrisch gesteuerte
Ventil, das ein Magnetventil ist, kurzzeitig geöffnet, um so
den Pumpenarbeitsraum zu entlasten und den erzielten
Kraftstoffdruck kurzzeitig abzubauen. Dies bedeutet, daß ein
sehr schnell schaltendes Magnetventil erforderlich ist, das
einen erheblichen Aufwand an die elektrische Steuerung und
an die Konstruktion des Ventils erfordert. Insbesondere ist
auch ein spezielles Druckventil in der Verbindung zwischen
Pumpenarbeitsraum und Einspritzventil vorgesehen, das bei
Kraftstoffhochdruckförderung zur Kraftstoffeinspritzdüse in
Förderrichtung öffnet und bei Beendigung der Einspritzung
schließt und das geeignet ist, Druckwellen zwischen dem
Druckventil und dem Kraftstoffeinspritzventil abzubauen und
in diesem Bereich einen angestrebten konstanten Standdruck
während der Einspritzpausen zu halten. Vorteilhaft ist es
bei einer unterteilten Kraftstoffeinspritzung mit einer
Voreinspritzung und einer Haupteinspritzung pro Arbeitstakt
des jeweiligen zu versorgenden Zylinders der Brennkraftmaschine
für einen konstanten Standdruck in den Einspritzpausen
zu sorgen.The invention is based on a distributor injection pump
the genus of
Durch die erfindungsgemäße Lösung wird die Steuerung einer in eine Vor- und Haupteinspritzung unterteilten Einspritzung wesentlich einfacher. Durch die konstruktiv über die Nockenform vorgegebe Unterbrechung entfällt eine elektrische Steuerung mit zwischenzeitlichen Öffnen und Wiederschließen des elektrisch gesteuerten Ventils zur Unterbrechung der Einspritzung zwischen Vor- und Haupteinspritzung und der damit verbundene Aufwand. Das elektrisch gesteuerte Ventil braucht ferner auch nicht die große Schaltgeschwindigkeit aufweisen, die für eine exakte Steuerung der Einspritzpause zwische Vor- und Haupteinspritzung erforderlich ist und kann erheblich einfacher und kleiner sein als ein speziell sehr schnell schaltendes Ventil. Ferner erlaubt die Verwendung von Einspritzventilen mit unterteilter Einspriterate eine exakter steuerbare Einspritzpause.The solution according to the invention makes control of a injection divided into a pre and main injection much easier. Through the constructive over the An electrical interruption is omitted Control with interim opening and closing of the electrically controlled valve to interrupt the Injection between pre and main injection and the associated effort. The electrically controlled valve also does not need the high switching speed have for precise control of the injection pause between pre and main injection is necessary and can be considerably simpler and smaller than a very special one fast switching valve. The use also allows of injectors with divided injection rate an exact controllable injection break.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung
dargestellt und wird in der nachfolgenden Beschreibung näher
erläutert. Es zeigen Figur 1 eine Prinzipdarstellung einer
Kraftstoffeinspritzpumpe, die von einem Magnetventil gesteuert
wird und Figur 2 einen Verlauf der erfindungsgemäßen
Nockenbahn in Form einer Nockenerhebungskurve über den
Drehwinkel 1 An embodiment of the invention is in the drawing
shown and is described in more detail in the following description
explained. FIG. 1 shows a basic illustration of a
Fuel injection pump controlled by a solenoid valve
and Figure 2 shows a course of the invention
Cam track in the form of a cam elevation curve over the
Angle of
Die erfindungsgemäße Lösung ist beim nachfolgend beschriebenen
Ausführungsbeispiel anhand einer Verteilereinspritzpumpe
realisiert, wie sie schematisch in der Figur 1
dargestellt ist. Es handelt sich dort um eine Verteilereinspritzpumpe
der Axialkolbenbauart, wenn auch der Gegenstand
der Erfindung auch bei anderen Kraftstoffeinspritzpumpen
verwendbar ist, wie z. B. Verteilereinspritzpumpen der Radialkolbenpumpenbauart
oder Einzelpumpen mit nur einem Pumpenkolben
zur Versorgung eines einzelnen Zylinders einer
Brennkraftmaschine oder Reihenpumpen. Besonders vorteilhaft
ist die Erfindung aber bei einer Verteilereinspritzpumpe
verwirklichbar, weil hier für die Versorgung der Einspritzventile
nur ein einziges elektrisch gesteuertes Ventil
erforderlich ist und die Verteilung auf die einzelnen
Einspritzventile mit Hilfe des Verteilers vorgenommen wird.
Bei der Verteilereinspritzpumpe der in der Figur 1 gezeigten
Art ist ein Pumpenkolben 1 vorgesehen, der in einer
Zylinderbohrung 2 verschieb- und verdrehbar angeordnet ist
und dort stirnseitig einen Pumpenarbeitsraum 10 einschließt.
Der Pumpenkolben ist dabei mit einer Nockenscheibe 6, die
axial nach unten weisende Nocken 5 der erfindungsgemäßen
Ausgestaltung aufweist, z. B. über eine nicht weiter
gezeigte Feder, gekoppelt. Die Nockenscheibe wird rotierend,
insbesondere synchron zur Drehzahl der von der Einspritzpumpe
versorgten Brennkraftmaschine von einer nicht weiter
gezeigten Antriebswelle in bekannter Weise angetrieben,
wobei die Nockenscheibe unter Einfluß der Feder auf einem
bekannten axial feststehenden Rollenring abläuft und in der
Folge den rotierenden Pumpen- und Verteilerkolben in eine
hin- und hergehende fördernden und ansaugende Bewegung
versetzt. Bei seiner Drehbewegung in Zuordnung zu einem
Pumpenförderhub, bei dem aus dem Pumpenarbeitsraum 10
Kraftstoff unter Hochdruck verdrängt wird, kommt der
Pumpenkolben mit einer von mehreren Einspritzleitungen 7
über eine Verteilernut 8 in der Mantelfläche des Pump- und
Verteilerkolbens in Verbindung. Die Verteilernut ist dabei
über einen Längskanal 9 ständig mit dem Pumpenarbeitsraum
verbunden. Die Einspritzleitung führt über ein Druckventil
12 zu einem Kraftstoffeinspritzventil 13, das dem jeweiligen
Zylinder einer Brennkraftmaschine zugeordnet ist.The solution according to the invention is described below
Embodiment based on a distributor injection pump
realized as shown schematically in FIG. 1
is shown. It is a distributor injection pump
the axial piston type, even if the object
the invention also in other fuel injection pumps
is usable such. B. radial piston pump type injection pumps
or single pumps with only one pump piston
to supply a single cylinder
Internal combustion engine or in-line pumps. Particularly advantageous
However, the invention is in a distributor injection pump
feasible because here for the supply of the injection valves
just a single electrically controlled valve
is required and the distribution to the individual
Injectors is made using the manifold.
In the case of the distributor injection pump shown in FIG. 1
Kind is a
Die Versorgung des Pumpenarbeitsraumes 10 mit Kraftstoff erfolgt
über eine Saugleitung 15, die von einem Saugraum 17,
der im wesentlichen nur noch gestrichelt dargestellt ist und
innerhalb des Gehäuses der Kraftstoffeinspritzpumpe eingeschlossen
ist, versorgt. Der Saugraum erhält Kraftstoff
von einer Kraftstofförderpumpe 18, die synchron zur Kraftstoffeinspritzpumpe,
z. B. von der Antriebswelle her, angetrieben
wird und somit Kraftstoff in drehzahlabhängigen Mengen
in den Saugraum fördert. Mit Hilfe eines zusätzlichen
Drucksteuerventils 19 wird der Druck im Saugraum üblicherweise
drehzahlabhängig gesteuert, wenn mit Hilfe dieses
Drucks Zusatzfunktionen der Kraftstoffeinspritzpumpe gesteuert
werden sollen. Über eine Überlaufdrossel 22 fließt beständig
Kraftstoff zum Vorratsbehälter 23 zurück, so daß
dadurch für Kühlung der Einspritzpumpe bzw. Entgasung des
Saugraumes gesorgt ist. Die Saugleitung 15 führt über ein
Rückschlagventil 16 in den Pumpenarbeitsraum, wobei das
Rückschlagventil in Richtung Pumpenarbeitsraum öffnet.
Parallel zu diesem Rückschlagventil ist ein elektrisch gesteuertes
Ventil 24 vorgesehen, das eine Bypassleitung 21
zum Druckventil 16 steuert und mit dessen Hilfe beim Öffnen
des Ventils eine Verbindung zwischen Pumpenarbeitsraum 10
und Saugraum 17 hergestellt ist und beim Schließen des Ventils
der Pumpenarbeitsraum 10 verschlossen ist. Das als Magnetventil
symbolisierte elektrisch gesteuerte Ventil 24
wird von einer Steuereinrichtung 25 entsprechend Betriebsparametern
in an sich bekannter Weise gesteuert. Bei genügend
großem Durchflußquerschnitt des Ventils 24 kann jedoch das
Rückschlagventil 16 auch entfallen. In diesem Falle wird der
Pumpenarbeitsraum beim Saughub ausschließlich über das
elektrischgesteuerte Ventil gefüllt.The
Mit Hilfe dieses elektrisch gesteuerten Ventils, wird der
Beginn der Hochdruckförderung des Pumpenkolbens derart gesteuert,
daß mit Hilfe dieses Ventils letztendlich auch der
Spritzbeginn gesteuert wird. Beim Verschließen baut sich im
Pumpenarbeitsraum 10 Einspritzdruck auf, der über den
Längskanal 9 und die Verteilernut 8 einer der Einspritzleitungen
7 zugeführt wird. Mit dem Wiederöffnen des elektrisch
gesteuerten Ventils wird die Hochdruckförderung
unterbrochen, so daß die Schließzeit des Ventils den Einspritzzeitpunkt
und die Einspritzmenge bestimmt. Durch
dieses Ventil kann ohne besondere Ansteuerung nun auch eine
Voreinspritzung realisiert werden.With the help of this electrically controlled valve, the
Controlled the start of high-pressure delivery of the pump piston in such a way
that with the help of this valve ultimately the
Spray start is controlled. When closing builds up in
Erfindungsgemäß sind die Förderseiten der Nockenflanken der Nocken 5, so ausgebildet, daß sie wie in der Figur 2 dargestellt über die Zeit einen Hubverlauf des Pumpenkolbens erzeugen, der unterteilt ist in einen ersten Bereich V der beginnend mit den Förderhub des Kolbens nach einem kleinen Förderhub endet, in einen zweiten Bereich P in dem der Kolben dann in eine rückläufige Bewegung versetzt wird, sodaß eine Hochdruckförderung somit wirksam beendet wird und eine Einspritzpause entsteht und schließlich in einen dritten Bereich H, in dem die Nockenflanke wieder ansteigt und den Pumpenkolben zwecks weiterer Förderung der Haupteinspritzmenge verschiebt. According to the delivery sides of the cam flanks Cam 5, designed so that it as in Figure 2 shown a stroke course of the pump piston over time generate, which is divided into a first area V of starting with the delivery stroke of the piston after a small one Conveying stroke ends in a second area P in which the Piston is then set into a retrograde motion so that high-pressure production is effectively ended and there is an injection break and finally into one third area H, in which the cam flank rises again and the pump piston for further delivery of the main injection quantity shifts.
Dem Diagramm in Figur 2 ist ebenfalls entnehmbar wie das elektrisch gesteuerte Ventil, z.B. ein Magnetventil oder auch ein von einem Piezo betätigtes Ventil zur Steuerung des Beginns der Voreinspritzmengenförderung und damit zugleich des Spritzbeginns im Punkt FB geschlossen wird und erst zur Beendigung der Haupteinspritzung wieder im Punkt FE geöffenet wird. Die Unterbrechung der Einspritzung erfolgt allein dadurch, daß durch den Nockenbereich P keine wirksame Hochdruckförderung möglich ist. Mit dieser konstruktiv vorgegebenen Spritzpause kann die Dauer der Unterbrechung der Hochdruckeinspritzung grundsätzlich mit konstant gehalten Nockenwinkeln erfolgen, insbesondere unabhängig von der Schaltgeschwindigkeit des elektrisch gesteuerten Ventils und der Drehzahl. In Einzelfällen ist es auch möglich, die Nockenform zu modifizieren, im Sinne der gewollten unterteilten Einspritzung. Statt eine rückläufigen Hubbewegung des Kolben zu erzeugen, kann dieser auch lediglich in seiner Stellung verharren oder nur so geringfügig weiterbewegt werden, daß seine Bewegung nicht ausreicht, eine Einspritzung nennenswerter Art zu ermöglichen, derart, daß eine wirksame Spritzpause auftritt, die die Kraftstoffzufuhr in den Brennraum der Brennkraftmaschine insgesamt so reduziert, daß der Druckanstieg im Brennraum kleiner wird und so eine geräuscharme Verbrennung erzielt werden kann.The diagram in Figure 2 can also be seen like that electrically controlled valve, e.g. a solenoid valve or also a valve actuated by a piezo to control the Beginning of the pre-injection quantity delivery and at the same time the start of spraying is closed in point FB and only for End of main injection again in point FE is opened. The injection is interrupted solely because the cam region P does not have an effective one High pressure funding is possible. With this constructively Predefined spray pause can mean the duration of the interruption high-pressure injection basically constant kept cam angles occur, especially regardless of the switching speed of the electrically controlled valve and the speed. In individual cases it is also possible to Modify cam shape, in the sense of the desired divided Injection. Instead of a downward stroke to generate the piston, this can also only in its Stay in position or move only slightly that his movement is insufficient, an injection to enable significant, such that a effective spray pause occurs, which in the fuel supply reduces the combustion chamber of the internal combustion engine overall that the pressure rise in the combustion chamber becomes smaller and so quiet combustion can be achieved.
Die Kraftstoffeinspritzpumpe der erfindungsgemäßen Art versorgt Einspritzventile, die geeignet sind, mit einer unterteilten Einspritzrate einzuspritzen und dabei für die Voreinspritzung eine kleineren Einspritzquerschnitt bereitstellen als für die Haupteinspritzung. Solche Einspritzventile sind bekannt und brauchen hier nicht näher beschrieben werden. Es wird hierzu z.B. auf die DE -C2-36 06 246 verwiesen. Mit Hilfe von solchermaßen ausgebildeten Einspritzventilen kann noch wesentlich exakter die erforderliche Einspritzpause zwischen Vor- und Haupteinspritzung eingehalten werden.The fuel injection pump of the invention Art supplies injectors that are suitable to inject a divided injection rate and thereby for the pre-injection has a smaller injection cross-section provide as for the main injection. Such injectors are known and do not need further details here to be discribed. For this, e.g. on the DE -C2-36 06 246 referenced. With the help of such Trained injection valves can be much more precise the required injection pause between pre and main injection be respected.
Claims (1)
- Distributor type injection pump having a pump working chamber (10) which is bounded by a pump piston driven by a cam drive provided with at least one cam and which is used to supply at least one fuel injection valve (13) with fuel injection quantities brought up to injection pressure, and also having an electrically controlled valve (24), via which the pump working chamber (10) of the fuel injection pump is connected to a relief chamber (17) or closed in order to control the injection quantity and injection time, and with interruption to the injection between a pilot and a main injection per injection operation, characterized in that the at least one cam is designed in such a way that, on its cam flank that moves the pump piston for its delivery stroke, it has a subregion (P) in which the piston (1), after a first delivery stroke for the pilot injection, remains at least in its position reached there or retracts the stroke in order to interrupt its high-pressure delivery stroke and then, in order to carry out the delivery stroke for the main injection, is moved onwards, the electrically controlled valve (24) being driven in such a way that at the beginning of the delivery stroke for the pilot injection it is closed and is only opened again in order to complete the main injection, the injection valve used being an injection valve serving to subdivide the injection into different injection rates, having a valve element on which at least two closing springs act and which, as a result of the high fuel pressure supplied, executes a first opening stroke for the pilot injection counter to the closing force of a first of the springs and then executes a further opening stroke counter to the force of the first and/or a second spring in order to carry out the main injection.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19648690 | 1996-11-25 | ||
| DE19648690A DE19648690A1 (en) | 1996-11-25 | 1996-11-25 | Fuel injection system |
| PCT/DE1997/001380 WO1998023858A1 (en) | 1996-11-25 | 1997-07-02 | Fuel injection system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0882180A1 EP0882180A1 (en) | 1998-12-09 |
| EP0882180B1 true EP0882180B1 (en) | 2002-10-23 |
Family
ID=7812662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97931698A Expired - Lifetime EP0882180B1 (en) | 1996-11-25 | 1997-07-02 | Distributor type fuel injection pump |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US6016786A (en) |
| EP (1) | EP0882180B1 (en) |
| JP (1) | JP2000504388A (en) |
| KR (1) | KR100539986B1 (en) |
| CN (1) | CN1079495C (en) |
| CZ (1) | CZ291287B6 (en) |
| DE (2) | DE19648690A1 (en) |
| HU (1) | HU220411B (en) |
| PL (1) | PL186623B1 (en) |
| RU (1) | RU2177559C2 (en) |
| SK (1) | SK284424B6 (en) |
| WO (1) | WO1998023858A1 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19834121A1 (en) * | 1998-07-29 | 2000-02-03 | Bosch Gmbh Robert | Fuel supply system of an internal combustion engine |
| DE19926308A1 (en) * | 1999-06-09 | 2000-12-21 | Bosch Gmbh Robert | Pump assembly for fuel |
| DE19948149A1 (en) * | 1999-10-07 | 2001-04-12 | Volkswagen Ag | Fuel delivery system and method for operating the fuel delivery system |
| DE10106095A1 (en) * | 2001-02-08 | 2002-08-29 | Bosch Gmbh Robert | Fuel system, method for operating the fuel system, computer program and control and / or regulating device for controlling the fuel system |
| US7520635B2 (en) * | 2003-07-02 | 2009-04-21 | S.C. Johnson & Son, Inc. | Structures for color changing light devices |
| FI119120B (en) * | 2004-01-23 | 2008-07-31 | Waertsilae Finland Oy | Apparatus and Method for Modifying Fuel Injection Pressure |
| DE102010026159A1 (en) * | 2010-07-06 | 2012-01-12 | Audi Ag | Fuel system for an internal combustion engine |
| JP5706850B2 (en) * | 2012-05-21 | 2015-04-22 | 株式会社丸山製作所 | Reciprocating pump |
| DE102013206674A1 (en) * | 2013-04-15 | 2014-10-16 | Robert Bosch Gmbh | Method and device for controlling a quantity control valve |
| CN103644059B (en) * | 2013-12-05 | 2016-05-04 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | A kind of pressure accumulation type oil supply system that adopts layer-stepping fuel dispenser |
| DE102018103252B4 (en) * | 2018-02-14 | 2022-01-20 | Danfoss Power Solutions Gmbh & Co. Ohg | Process and device for venting the intake side of an artificially commutated hydraulic pump |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR91309E (en) * | 1965-11-09 | 1968-05-24 | Inst Francais Du Petrole | Double injection device |
| US3698373A (en) * | 1969-12-22 | 1972-10-17 | Mitsubishi Motors Corp | Fuel injection system for diesel engine |
| GB2102890B (en) * | 1981-06-26 | 1984-09-12 | Lucas Ind Plc | Fuel pumping apparatus |
| DE3147467C1 (en) * | 1981-12-01 | 1983-04-21 | Daimler-Benz Ag, 7000 Stuttgart | Injection system for internal combustion engines |
| US4838232A (en) * | 1984-08-14 | 1989-06-13 | Ail Corporation | Fuel delivery control system |
| DE3445825A1 (en) * | 1984-12-15 | 1986-06-19 | Klöckner-Humboldt-Deutz AG, 5000 Köln | FUEL INJECTION SYSTEM |
| US4962743A (en) * | 1989-06-06 | 1990-10-16 | Cummins Engine Company, Inc. | Injection rate control cam |
| DE4016309A1 (en) * | 1990-05-21 | 1991-11-28 | Bosch Gmbh Robert | FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES |
| JPH05157019A (en) * | 1991-12-06 | 1993-06-22 | Hino Motors Ltd | Fuel injection device |
| DE4223728C2 (en) * | 1992-07-18 | 1999-02-18 | Daimler Benz Ag | Valve-controlled injection device, in particular for an air-compressing injection internal combustion engine |
-
1996
- 1996-11-25 DE DE19648690A patent/DE19648690A1/en not_active Withdrawn
-
1997
- 1997-07-02 DE DE59708561T patent/DE59708561D1/en not_active Expired - Lifetime
- 1997-07-02 PL PL97327975A patent/PL186623B1/en not_active IP Right Cessation
- 1997-07-02 CN CN97191634A patent/CN1079495C/en not_active Expired - Fee Related
- 1997-07-02 CZ CZ19981898A patent/CZ291287B6/en not_active IP Right Cessation
- 1997-07-02 JP JP10524109A patent/JP2000504388A/en active Pending
- 1997-07-02 HU HU9901494A patent/HU220411B/en not_active IP Right Cessation
- 1997-07-02 US US09/117,340 patent/US6016786A/en not_active Expired - Fee Related
- 1997-07-02 SK SK903-98A patent/SK284424B6/en not_active IP Right Cessation
- 1997-07-02 EP EP97931698A patent/EP0882180B1/en not_active Expired - Lifetime
- 1997-07-02 KR KR1019980704921A patent/KR100539986B1/en not_active IP Right Cessation
- 1997-07-02 WO PCT/DE1997/001380 patent/WO1998023858A1/en active IP Right Grant
- 1997-07-02 RU RU98115715/06A patent/RU2177559C2/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DE19648690A1 (en) | 1998-05-28 |
| CZ189898A3 (en) | 1999-01-13 |
| KR100539986B1 (en) | 2006-02-28 |
| PL327975A1 (en) | 1999-01-04 |
| HUP9901494A2 (en) | 1999-08-30 |
| SK90398A3 (en) | 1999-01-11 |
| CN1207157A (en) | 1999-02-03 |
| EP0882180A1 (en) | 1998-12-09 |
| HU220411B (en) | 2002-01-28 |
| JP2000504388A (en) | 2000-04-11 |
| RU2177559C2 (en) | 2001-12-27 |
| PL186623B1 (en) | 2004-02-27 |
| SK284424B6 (en) | 2005-04-01 |
| CZ291287B6 (en) | 2003-01-15 |
| US6016786A (en) | 2000-01-25 |
| CN1079495C (en) | 2002-02-20 |
| HUP9901494A3 (en) | 2000-03-28 |
| WO1998023858A1 (en) | 1998-06-04 |
| DE59708561D1 (en) | 2002-11-28 |
| KR19990076796A (en) | 1999-10-15 |
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