WO2001023740A1 - Fuel injection pump - Google Patents

Fuel injection pump Download PDF

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Publication number
WO2001023740A1
WO2001023740A1 PCT/DE2000/003402 DE0003402W WO0123740A1 WO 2001023740 A1 WO2001023740 A1 WO 2001023740A1 DE 0003402 W DE0003402 W DE 0003402W WO 0123740 A1 WO0123740 A1 WO 0123740A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
fuel injection
injection pump
drive shaft
sensor element
Prior art date
Application number
PCT/DE2000/003402
Other languages
German (de)
French (fr)
Inventor
Wolfgang Espenschied
Matthias Schnell
Burkhard Veldten
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2001023740A1 publication Critical patent/WO2001023740A1/en

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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
    • 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
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • 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
    • F02M41/121—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 with piston arranged axially to driving shaft
    • 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
    • F02M41/128—Varying injection timing by angular adjustment of the face-cam or the rollers support
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/24—Fuel-injection apparatus with sensors

Definitions

  • the invention relates to a fuel injection pump with a housing, a drive shaft which is mounted in the housing, a pulse generator wheel which is attached to the drive shaft in a rotationally fixed manner, a carrier wheel which is driven by a pin adjuster relative to the housing and about the central axis of the drives -
  • the shaft can be rotated around a certain muscle area, and a rotation angle sensor that contains a sensor element.
  • Such a Kraf fuel injection pump is known from DE 43 44 865 AI.
  • This fuel injection pump is a so-called distributor injection pump, in which a single pump piston is used to inject the correct amount of fuel m into the corresponding cylinder of an internal combustion engine.
  • the pump piston makes as many strokes as there are cylinders of the engine to be supplied during one revolution of the drive shaft; the drive shaft of the fuel injection pump rotates at half the speed of the crankshaft of the engine.
  • the injection adjuster is provided, by means of which the injection timing can be adapted to the prevailing operating conditions of the engine. In the case of a distributor injection pump, this is done in that a cam ring which actuates the pump piston and which drive shaft is driven, is adjusted relative to this by about ⁇ 10 °.
  • the rotation angle sensor is used to provide a pump control unit that monitors the injection process with information on the one hand about the speed of the drive shaft and on the other hand about the rotation between the drive shaft and the cam ring. Since the cam ring can be adjusted relative to the housing of the fuel injection pump by the injection adjuster, the rotary sensor must also be adjusted synchronously with the cam ring. In the fuel injection pump known from the aforementioned publication, the rotary sensor is mounted on the carrier wheel for this purpose; the carrier wheel is in turn connected to a roller ring which is adjusted by the injection adjuster and in this way determines the injection timing.
  • the rotary sensor which scans the pulse generator wheel radially, is connected to a suitable connection on the housing via a flexible conductor foil. The conductor foil enables the rotary angle sensor to be adjusted together with the carrier wheel around the angle of 20 °.
  • the fuel injection pump according to the invention with the features of the characterizing part of patent claim 1 is based on the basic idea of pivotably mounting only those parts of the rotary muscle sensor in the housing where this is absolutely necessary. Ultimately, this is only the part of the magnetic circuit that is directly opposite the encoder wheel.
  • the sensor element which is provided with an electrical lead, can be attached to the housing, on the other hand, so that on the one hand there is a simpler assembly and on the other hand a simplified connection. It is now no longer necessary to have a flexible conductor foil Isolation inside the fuel-filled housing of the fuel injection pump must be ensured.
  • the speed sensor contains a magnet which is fixedly attached to the housing, and that at least one receiving piece is fixedly attached to the carrier wheel which faces the magnet attached to the housing and extends over the specific angular range.
  • the magnet can now also be attached to the housing in a particularly simple manner.
  • the receiving piece extends geometrically over such a range that the magnetic flux between the magnet and the pulse generator wheel is ensured in any position of the carrier wheel.
  • the receiving piece has a curved outer surface, the center of curvature of which lies on the central axis of the drive shaft. This ensures that the air gap between the receptacle and the corresponding counterpart of the angle of rotation sensor always has the same width regardless of an adjustment of the receptacle.
  • two receptacles are provided and two pole pieces, each of which is arranged on one side of the pulse generator wheel and provided with one of the receptacles, the magnet being connected to two flux guide pieces which are fixedly attached to the housing and through an air gap the receptacle are separated.
  • the pulse generator wheel is no longer scanned radially, as is provided in the known fuel injection pump, but in the axial direction by means of the two pole shoes, which are arranged opposite one another on one and the other side of the pulse generator wheel. This results in a closed magnetic circuit, which leads to greater variations in the lement measured flux density leads as a magnetic circuit with an open feedback, as used in the known fuel injection pump.
  • a closed magnetic circuit can be obtained by providing two pole shoes which are arranged at an angular distance from one another and opposite the radially outer surface of the pulse generator wheel.
  • a closed magnetic circuit is advantageous because, due to the air gap between the pivotable receptacle and the magnet fixedly attached to the housing, there is an additional air gap in the rotational angle sensor according to the invention; this additional air gap basically reduces the variation of the magnetic flux caused by the pulse generator wheel and measurable by the sensor element.
  • the magnetic flux recirculation now provided again leads to an increase in the variation of the magnetic flux, so that a satisfactory measurement result can be obtained.
  • the sensor element is attached to one of the flow guide pieces and that the flow guide piece, which is provided with the sensor element, is made with a greater length than the other flow guide piece.
  • the sensor element is arranged in the immediate vicinity of the magnet, so that the induction in the sensor element would correspond to the induction of the magnet, so that no measurement would be possible.
  • FIG. 1 is a longitudinal section of a section of an inventive fuel injection pump
  • FIG. 2 shows a cross section of a section of the fuel injection pump according to the invention.
  • a part of a fuel injection pump relevant for understanding the invention is shown. It is a fuel injection pump of the distributor type.
  • the components relevant to the actual fuel injection such as cam ring, injection adjuster or pump piston, are not important for understanding the invention and are therefore not described.
  • the fuel injection pump has a housing 10, in which a drive shaft 12 is rotatably mounted.
  • the drive shaft 12 is driven at half the speed of the engine, which is supplied with the fuel, and in turn drives a cam ring or a cam disk, by means of which the translatory movement of a pump piston is achieved.
  • a pulse generator wheel 14 is attached to the drive shaft 12 in a rotationally fixed manner, for example by shrinking on.
  • the pulse generator wheel 14 is provided with a plurality of teeth 16 which are generally arranged uniformly, tooth gaps 18 being provided at regular intervals.
  • the number of tooth gap corresponds to the number of cylinders in the engine to be supplied with fuel.
  • the pulse generator wheel 14 is scanned by means of a rotation angle sensor 20.
  • the rotary angle sensor 20 has a magnet 22, which is a permanent magnet and is fixedly attached to the housing 10.
  • a holder 24 is provided which is screwed to the housing 10.
  • Two flux guide pieces 26, 28 are attached to the magnets 22.
  • the two flux guide pieces 26, 28 end approximately flush with the holder 24 on its side facing the drive shaft 12, a sensor element 30 being attached to the end face of the flow guide piece 26.
  • the sensor element 30 serves to detect changes in the magnetic flux.
  • the two flow pieces 26, 28 are designed asymmetrically such that the magnet 22 has jerked away from the sensor element 30 with respect to a central plane defined by the pulse generator wheel 16 between the two flow guide pieces. A comparatively large distance between the sensor element 30 and the magnet 22 is thus achieved, as a result of which there is little influence on the variation of the magnetic flux measured by the sensor element by the magnetic flux generated by the magnet.
  • the rotary angle sensor 20 also has two pole shoes 32, 34 which are arranged on one and the other side of the tooth 16 of the pulse generator wheel 14.
  • the two pole shoes 32, 34 consist of a soft magnetic material and are attached to a support part 36 made of non-magnetic material.
  • the support member 36 is fixedly connected to a support wheel 38 which is rotatably mounted on the drive shaft 12.
  • the carrier wheel is connected directly or indirectly to an injection adjuster of the fuel injection pump, so that it is relative to the housing by a predetermined angular range of generally ⁇ 10 ° from an initial position can be pivoted.
  • the drive shaft 12 serves only as a guide for the carrier wheel 38.
  • Each of the two pole shoes 32, 34 is provided with a receiving piece 40, 42, each of which has a curved outer surface 44.
  • the curved outer surface 44 of each receiving piece 40, 42 lies opposite the two flow guide pieces 26, 28 with a small air gap.
  • Each receiving piece 40, 42 is measured in the circumferential direction with a length that corresponds to the angular range over which the carrier wheel 38 can be adjusted, that is to say over approximately 20 ° in the example shown.
  • the outer surface 44 of the receiving pieces is designed with such a curvature that the center of curvature of the surface lies on the central axis M of the drive shaft 12.

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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)

Abstract

The invention relates to a fuel injection pump that comprises a housing (10), a drive shaft (12) that is rotatably mounted in the housing (10) and a pulse generator wheel (14) that is mounted on the drive shaft (12) in a rotationally fixed manner. The pump is further provided with a load wheel (38) that can be rotated by an injection adjuster relative to the housing (10) and about the center axis (M) of the drive shaft (12) by a defined angular range, and with an angle of rotation sensor (20) that comprises a sensor element (30). In order to simplify the structure of the angle of rotation sensor, the sensor element (30) is mounted on the housing (10) in a fixed manner.

Description

Kraftstoffeinspritzpumpe Fuel injection pump
Stand der TechnikState of the art
Die Erfindung betrifft eine Kraftstoffeinspritzpumpe mit ei- nem Gehäuse, einer Antriebswelle, die m dem Gehäuse gelagert ist, einem Impulsgeberrad, das drehfest auf der Antriebswelle angebracht ist, einem Tragerrad, das von einem Spπtzverstel- ler relativ zum Gehäuse und um die Mittelachse der Antr_ebs- welle um einen bestimmten mkelbereich verdreht werden kann, und einem Drehwinkelsensor, der ein Sensorelement enthalt.The invention relates to a fuel injection pump with a housing, a drive shaft which is mounted in the housing, a pulse generator wheel which is attached to the drive shaft in a rotationally fixed manner, a carrier wheel which is driven by a pin adjuster relative to the housing and about the central axis of the drives - The shaft can be rotated around a certain muscle area, and a rotation angle sensor that contains a sensor element.
Eine solche Kraf stoffeinspritzpumpe ist aus der DE 43 44 865 AI bekannt. Es handelt sich bei dieser Kraftstoffeinspritzpumpe um eine sogenannte Verteileremspritzpumpe, bei der ein einziger Pumpenkolben dazu verwendet wird, die korrekte Kraftstoffmenge m den entsprechenden Zylinder eines Verbrennungsmotors einzuspritzen. Der Pumpenkolben macht wahrend einer Umdrehung der Antriebswelle so viele Hube wie Zylinder des Motors zu versorgen sind; die Antriebswelle der Kraft- Stoffeinspritzpumpe dreht sich dabei mit der halben Drehzahl der Kurbelwelle des Motors.Such a Kraf fuel injection pump is known from DE 43 44 865 AI. This fuel injection pump is a so-called distributor injection pump, in which a single pump piston is used to inject the correct amount of fuel m into the corresponding cylinder of an internal combustion engine. The pump piston makes as many strokes as there are cylinders of the engine to be supplied during one revolution of the drive shaft; the drive shaft of the fuel injection pump rotates at half the speed of the crankshaft of the engine.
Da der Kraftstoff m die entsprechenden Zylinder, bezogen auf den Drehwinkel der Kurbelwelle, nicht immer zu demselben Zeitpunkt eingespritzt werden muß, ist der Spritzversteller vorgesehen, mittels dem der Einspritzzeitpunkt an die herrschenden Betriebsbedingungen des Motors angepaßt werden kann. Bei einer Verteileremspritzpumpe geschieht dies dadurch, daß ein den Pumpenkolben betätigender Nockenring, der von der An- triebswelle angetrieben wird, relativ zu dieser um etwa ± 10° verstellt wird.Since the fuel m does not always have to be injected into the corresponding cylinders, based on the angle of rotation of the crankshaft, the injection adjuster is provided, by means of which the injection timing can be adapted to the prevailing operating conditions of the engine. In the case of a distributor injection pump, this is done in that a cam ring which actuates the pump piston and which drive shaft is driven, is adjusted relative to this by about ± 10 °.
Der Drehwmkelsensor dient dazu, einem Pumpensteuergerat, das den Einspritzvorgang überwacht, Informationen zum einen über die Drehzahl der Antriebswelle und zum anderen über den Dreh- wmkel zwischen Antriebswelle und Nockenring bereitzustellen. Da der Nockenring relativ zum Gehäuse der Kraftstoffeinspritzpumpe vom Spritzversteller verstellt werden kann, muß auch der Drehw kelsensor synchron mit dem Nockenring verstellt werden. Bei der aus der oben genannten Offenlegungs- schrift bekannten Kraftstoffeinspritzpumpe ist zu diesem Zweck der Drehwmkelsensor auf dem Tragerrad angebracht; das Tragerrad ist wiederum mit einem Rollenring verbunden, der vom Spritzversteller verstellt wird und auf diese Weise den Einspritzzeitpunkt festlegt. Der Drehwmkelsensor, der das Impulsgeberrad radial abtastet, ist über eine flexible Lei- terfolie mit einem geeigneten Anschluß am Gehäuse verbunden. Die Leiterfolie ermöglicht es dem Drehwmkelsensor, sich zu- sammen mit dem Tragerrad um den Wmkelbereich von insgesamt 20° zu verstellen.The rotation angle sensor is used to provide a pump control unit that monitors the injection process with information on the one hand about the speed of the drive shaft and on the other hand about the rotation between the drive shaft and the cam ring. Since the cam ring can be adjusted relative to the housing of the fuel injection pump by the injection adjuster, the rotary sensor must also be adjusted synchronously with the cam ring. In the fuel injection pump known from the aforementioned publication, the rotary sensor is mounted on the carrier wheel for this purpose; the carrier wheel is in turn connected to a roller ring which is adjusted by the injection adjuster and in this way determines the injection timing. The rotary sensor, which scans the pulse generator wheel radially, is connected to a suitable connection on the housing via a flexible conductor foil. The conductor foil enables the rotary angle sensor to be adjusted together with the carrier wheel around the angle of 20 °.
Vorteile der ErfindungAdvantages of the invention
Die erf dungsgemaße Kraftstoffeinspritzpumpe mit den Merkmalen des kennzeichnenden Teils des Patentanspruchs 1 basiert auf dem Grundgedanken, nur diejenigen Teile des Dreh mkel- sensors verschwenkbar im Gehäuse anzubringen, bei denen dies unbedingt erforderlich ist. Letztendlich ist dies nur der Teil des Magnetkreises, der dem Impulsgeberrad unmittelbar gegenüberliegt. Insbesondere das Sensorelement, das mit einer elektrischen Zuleitung versehen ist, kann dagegen fest am Gehäuse angebracht werden, so daß sich zum einen eine einfachere Montage und zum anderen em vereinfachter Anschluß ergibt. Es ist nunmehr keine flexible Leiterfolie erforderlich, deren Isolation im Inneren des mit Kraftstoff gefüllten Gehäuses der Kraftstoffeinspritzpumpe gewährleistet werden muß.The fuel injection pump according to the invention with the features of the characterizing part of patent claim 1 is based on the basic idea of pivotably mounting only those parts of the rotary muscle sensor in the housing where this is absolutely necessary. Ultimately, this is only the part of the magnetic circuit that is directly opposite the encoder wheel. In particular, the sensor element, which is provided with an electrical lead, can be attached to the housing, on the other hand, so that on the one hand there is a simpler assembly and on the other hand a simplified connection. It is now no longer necessary to have a flexible conductor foil Isolation inside the fuel-filled housing of the fuel injection pump must be ensured.
Gemäß einer bevorzugten Ausführungsform ist vorgesehen, daß der Drehzahlsensor einen Magneten enthält, der fest am Gehäuse angebracht ist, und daß am Trägerrad fest mindestens ein Aufnahmestück angebracht ist, das dem am Gehäuse angebrachten Magneten zugewandt ist und sich über den bestimmten Winkelbereich erstreckt. Auch der Magnet kann nunmehr besonders ein- fach fest am Gehäuse angebracht werden. Das Aufnahmestück erstreckt sich geometrisch über einen solchen Bereich, daß der Magnetfluß zwischen dem Magneten und dem Impulsgeberrad in jeder Stellung des Trägerrades gewährleistet ist.According to a preferred embodiment, it is provided that the speed sensor contains a magnet which is fixedly attached to the housing, and that at least one receiving piece is fixedly attached to the carrier wheel which faces the magnet attached to the housing and extends over the specific angular range. The magnet can now also be attached to the housing in a particularly simple manner. The receiving piece extends geometrically over such a range that the magnetic flux between the magnet and the pulse generator wheel is ensured in any position of the carrier wheel.
Gemäß einer bevorzugten Ausführungsform ist vorgesehen, daß das Aufnahmestück eine gekrümmte Außenfläche hat, deren Krümmungsmittelpunkt auf der Mittelachse der Antriebswelle liegt. Dies gewährleistet, daß der Luftspalt zwischen dem Aufnahmestück und dem entsprechenden Gegenstück des Drehwinkelsen- sors unabhängig von einer Verstellung des Aufnahmestücks immer dieselbe Breite hat.According to a preferred embodiment it is provided that the receiving piece has a curved outer surface, the center of curvature of which lies on the central axis of the drive shaft. This ensures that the air gap between the receptacle and the corresponding counterpart of the angle of rotation sensor always has the same width regardless of an adjustment of the receptacle.
Gemäß einer bevorzugten Ausführungsform sind zwei Aufnahmestücke vorgesehen sowie zwei Polschuhe, von denen jeder auf einer Seite des Impulsgeberrades angeordnet und mit einem der Aufnahmestücke versehen ist, wobei der Magnet mit zwei Flußleitstücken in Verbindung steht, die fest am Gehäuse angebracht sind und durch einen Luftspalt von dem Aufnahmestück getrennt sind. Bei dieser Ausgestaltung wird das Impulsgeber- rad nicht mehr radial abgetastet, wie dies bei der bekannten Kraftstoffeinspritzpumpe vorgesehen ist, sondern in axialer Richtung mittels der beiden Polschuhe, die einander gegenüberliegend auf der einen und der anderen Seite des Impulsge- berrades angeordnet sind. Somit ergibt sich ein geschlossener Magnetkreis, der zu größeren Variationen der von dem Sensore- lement gemessenen Flußdichte fuhrt als ein Magnetkreis mit einer offenen Rückführung, wie er bei der bekannten Kraftstoffeinspritzpumpe verwendet wird. Wenn alternativ zu dieser Ausführungsform eine radiale Abtastung des Impulsgeberrades gewünscht wird, kann ein geschlossener Magnetkreis dadurch erhalten werden, daß zwei Polschuhe vorgesehen sind, die in einem Winkelabstand voneinander und gegenüber der radial außenliegenden Flache des Impulsgeberrades angeordnet sind. In jedem Fall ist ein geschlossener Magnetkreis vorteilhaft, da aufgrund des Luftspaltes zwischen dem verschwenkbaren Aufnahmestuck und dem fest am Gehäuse angebrachten Magneten bei dem erfindungsgemaßen Drehwinkelsensor ein zusätzlicher Luftspalt vorhanden ist; dieser zusätzliche Luftspalt verringert grundsätzlich die vom Impulsgeberrad hervorgerufene und von dem Sensorelement meßbare Variation des Magnetflusses. Die nunmehr vorgesehen Magnetflußruckfuhrung fuhrt wieder zu einem Anstieg der Variation des Magnetflusses, so daß sich ein zufriedenstellendes Meßergebnis erhalten laßt.According to a preferred embodiment, two receptacles are provided and two pole pieces, each of which is arranged on one side of the pulse generator wheel and provided with one of the receptacles, the magnet being connected to two flux guide pieces which are fixedly attached to the housing and through an air gap the receptacle are separated. In this embodiment, the pulse generator wheel is no longer scanned radially, as is provided in the known fuel injection pump, but in the axial direction by means of the two pole shoes, which are arranged opposite one another on one and the other side of the pulse generator wheel. This results in a closed magnetic circuit, which leads to greater variations in the lement measured flux density leads as a magnetic circuit with an open feedback, as used in the known fuel injection pump. If, as an alternative to this embodiment, a radial scanning of the pulse generator wheel is desired, a closed magnetic circuit can be obtained by providing two pole shoes which are arranged at an angular distance from one another and opposite the radially outer surface of the pulse generator wheel. In any case, a closed magnetic circuit is advantageous because, due to the air gap between the pivotable receptacle and the magnet fixedly attached to the housing, there is an additional air gap in the rotational angle sensor according to the invention; this additional air gap basically reduces the variation of the magnetic flux caused by the pulse generator wheel and measurable by the sensor element. The magnetic flux recirculation now provided again leads to an increase in the variation of the magnetic flux, so that a satisfactory measurement result can be obtained.
Gemäß der bevorzugten Ausführungsform ist vorgesehen, daß das Sensorelement an einem der Flußleitstucke angebracht ist und daß das Flußleitstuck, das mit dem Sensorelement versehen ist, mit einer größeren Lange ausgeführt ist als das andere Flußleitstuck. Auf diese Weise ergibt sich ein besonders gro- ßer Abstand zwischen dem Sensorelement und dem Magneten, so daß die von dem Sensorelement gemessene Variation des Magnetflusses nicht von dem vom Magneten erzeugten Magnetfluß beeinträchtigt wird. Wurde nämlich das Sensorelement in unmittelbarer Nahe des Magneten angeordnet werden, entspräche die Induktion im Sensorelement m jedem Fall der Induktion des Magneten, so daß keine Messung möglich wäre. ZeichnungenAccording to the preferred embodiment, it is provided that the sensor element is attached to one of the flow guide pieces and that the flow guide piece, which is provided with the sensor element, is made with a greater length than the other flow guide piece. In this way, there is a particularly large distance between the sensor element and the magnet, so that the variation of the magnetic flux measured by the sensor element is not impaired by the magnetic flux generated by the magnet. If the sensor element was arranged in the immediate vicinity of the magnet, the induction in the sensor element would correspond to the induction of the magnet, so that no measurement would be possible. drawings
Die Erfindung wird nachfolgend unter Bezugnahme auf eine bevorzugte Ausführungsform beschrieben, die m den beigefugten Zeichnungen dargestellt ist. In diesen zeigen:The invention is described below with reference to a preferred embodiment, which is illustrated in the accompanying drawings. In these show:
- Figur 1 einem Längsschnitt einen Ausschnitt aus einer erfmdungsgemaßen Kraftstoffeinspritzpumpe; und- Figure 1 is a longitudinal section of a section of an inventive fuel injection pump; and
- Figur 2 einem Querschnitt einen Ausschnitt aus der erfmdungsgemaßen Kraftstoffeinspritzpumpe .- Figure 2 shows a cross section of a section of the fuel injection pump according to the invention.
Beschreibung des AusfuhrungsbeispielsDescription of the exemplary embodiment
In den Figuren ist ein für das Verständnis der Erfindung relevanter Teil einer Kraftstoffeinspritzpumpe gezeigt. Es handelt sich hierbei um eine Kraftstoffeinspritzpumpe der Ver- teilerbauart . Die für die eigentliche Kraftstoffeinspritzung relevanten Bauteile wie Nockenring, Spritzversteller oder Pumpenkolben sind für das Verständnis der Erfindung nicht wichtig und werden daher nicht beschrieben.In the figures, a part of a fuel injection pump relevant for understanding the invention is shown. It is a fuel injection pump of the distributor type. The components relevant to the actual fuel injection, such as cam ring, injection adjuster or pump piston, are not important for understanding the invention and are therefore not described.
Die Kraftstoffeinspritzpumpe weist ein Gehäuse 10 auf, m welchem drehbar eine Antriebswelle 12 gelagert ist. Die An- triebswelle 12 wird mit der halben Drehzahl des Motors angetrieben, der mit dem Kraftstoff versorgt wird, und treibt ihrerseits einen Nockenring oder eine Nockenscheibe an, mittels dem bzw. der die translatorische Bewegung eines Pumpenkolbens erzielt wird.The fuel injection pump has a housing 10, in which a drive shaft 12 is rotatably mounted. The drive shaft 12 is driven at half the speed of the engine, which is supplied with the fuel, and in turn drives a cam ring or a cam disk, by means of which the translatory movement of a pump piston is achieved.
Auf der Antriebswelle 12 ist drehfest ein Impulsgeberrad 14 angebracht, beispielsweise durch Aufschrumpfen. Das Impulsgeberrad 14 ist mit einer Vielzahl von im allgemeinen gleichmaßig angeordneten Zahnen 16 versehen, wobei m regelmäßigen Abstanden Zahnlucken 18 vorgesehen sind. Die Anzahl der Zahn- lucken entspricht der Anzahl der mit Kraftstoff zu versorgenden Zylinder des Motors.A pulse generator wheel 14 is attached to the drive shaft 12 in a rotationally fixed manner, for example by shrinking on. The pulse generator wheel 14 is provided with a plurality of teeth 16 which are generally arranged uniformly, tooth gaps 18 being provided at regular intervals. The number of tooth gap corresponds to the number of cylinders in the engine to be supplied with fuel.
Das Impulsgeberrad 14 wird mittels eines Drehwinkelsensors 20 abgetastet. Der Drehwmkelsensor 20 weist einen Magneten 22 auf, der e n Permanentmagnet ist und fest am Gehäuse 10 angebracht ist. Zu diesem Zweck ist ein Halter 24 vorgesehen, der mit dem Gehäuse 10 verschraubt ist. An den Magneten 22 sind zwei Flußleitstucke 26, 28 angesetzt. Die beiden Flußleit- stucke 26, 28 enden etwa bundig mit dem Halter 24 auf dessen der Antriebswelle 12 zugewandten Seite, wobei an der Stirnflache des Flußleitstuckes 26 ein Sensorelement 30 angebracht ist. Das Sensorelement 30 dient dazu, Änderungen des Magnetflusses zu erfassen. Die beiden Flußstucke 26, 28 sind derart asymmetrisch gestaltet, daß der Magnet 22 bez glich einer von dem Impulsgeberrad 16 definierten Mittelebene zwischen den beiden Flußleitstucken vom Sensorelement 30 weggeruckt ist. Somit wird ein vergleichsweise großer Abstand zwischen dem Sensorelement 30 und dem Magneten 22 erzielt, wodurch sich eine geringe Beeinflussung der vom Sensorelement gemessenen Variation des Magnetflusses durch den vom Magneten erzeugten Magnetfluß ergibt.The pulse generator wheel 14 is scanned by means of a rotation angle sensor 20. The rotary angle sensor 20 has a magnet 22, which is a permanent magnet and is fixedly attached to the housing 10. For this purpose, a holder 24 is provided which is screwed to the housing 10. Two flux guide pieces 26, 28 are attached to the magnets 22. The two flux guide pieces 26, 28 end approximately flush with the holder 24 on its side facing the drive shaft 12, a sensor element 30 being attached to the end face of the flow guide piece 26. The sensor element 30 serves to detect changes in the magnetic flux. The two flow pieces 26, 28 are designed asymmetrically such that the magnet 22 has jerked away from the sensor element 30 with respect to a central plane defined by the pulse generator wheel 16 between the two flow guide pieces. A comparatively large distance between the sensor element 30 and the magnet 22 is thus achieved, as a result of which there is little influence on the variation of the magnetic flux measured by the sensor element by the magnetic flux generated by the magnet.
Der Drehwmkelsensor 20 weist außerdem zwei Polschuhe 32, 34 auf, die auf der einen und der anderen Seite der Zahne 16 des Impulsgeberrades 14 angeordnet sind. Die beiden Polschuhe 32, 34 bestehen aus einem weichmagnetischen Material und sind an einem Tragerteil 36 aus nichtmagnetischem Material angebracht. Das Tragerteil 36 ist fest mit einem Tragerrad 38 verbunden, das drehbar auf der Antriebswelle 12 angebracht ist. Das Tragerrad ist mittelbar oder unmittelbar mit einem Spritzversteller der Kraftstoffeinspritzpumpe verbunden, so daß es relativ zum Gehäuse um einen vorbestimmten Wmkelbereich von im allgemeinen ± 10° aus einer Ausgangslage heraus verschwenkt werden kann. Die Antriebswelle 12 dient dabei lediglich als Fuhrung für das Tragerrad 38.The rotary angle sensor 20 also has two pole shoes 32, 34 which are arranged on one and the other side of the tooth 16 of the pulse generator wheel 14. The two pole shoes 32, 34 consist of a soft magnetic material and are attached to a support part 36 made of non-magnetic material. The support member 36 is fixedly connected to a support wheel 38 which is rotatably mounted on the drive shaft 12. The carrier wheel is connected directly or indirectly to an injection adjuster of the fuel injection pump, so that it is relative to the housing by a predetermined angular range of generally ± 10 ° from an initial position can be pivoted. The drive shaft 12 serves only as a guide for the carrier wheel 38.
Jeder der beiden Polschuhe 32, 34 ist mit einem Aufnahmestuck 40, 42 versehen, das jeweils eine gekrümmte Außenflache 44 aufweist. Die gekrümmte Außenflache 44 jedes Aufnahmestucks 40, 42 liegt den beiden Flußleitstucken 26, 28 mit einem geringen Luftspalt gegenüber. Jedes Aufnahmestuck 40, 42 ist in Umfangsrichtung gemessen mit einer Lange ausgeführt, die dem Winkelbereich entspricht, über den das Tragerrad 38 verstellt werden kann, im gezeigten Beispiel also über etwa 20°. Wei¬ terhin ist die Außenflache 44 der Aufnahmestucke mit einer solchen Krümmung ausgeführt, daß der Krummungsmittelpunkt der Flache auf der Mittelachse M der Antriebswelle 12 liegt. Die- se Gestaltung gewahrleistet, daß unabhängig von der jeweiligen Stellung des Tragerrades 38 relativ zum Magneten 22 die beiden Polschuhe 32, 34 mittels der beiden Aufnahmestucke 40, 42 mit dem Magneten 22 gekoppelt sind. Unabhängig von der Stellung des Tragerrades bildet sich somit ein geschlossener Magnetkreis aus, der ausgehend vom Magneten 22 durch das Flußleitstuck 28, den Luftspalt zwischen dem Flußleitstuck 28 und dem Aufnahmestuck 42, das Aufnahmestuck 42, den Polschuh 34, den Luftspalt zwischen dem Polschuh 34 und dem Impulsgeberrad 14, die Zahne 16 des Impulsgeberrades, den Luftspalt zwischen dem Impulsgeberrad 14 und dem Polschuh 32, den Polschuh 32, das Aufnahmestuck 40, den Luftspalt zwischen dem Aufnahmestuck 40 und dem Sensorelement 30, das Sensorelement 30 und schließlich das Flußleitstuck 26 zur ck zum Magneten 22 fuhrt. Die Magnetflußstarke in diesem geschlossenen Ma- gnetkreis ändert sich bei einer Drehung der Antriebswelle und damit des Impulsgeberrades 14 periodisch aufgrund des Durchgangs der Zahne und der Zahnlucken durch die Flache zwischen den beiden Polschuhen 32, 34. Diese Variation des Magnetflusses kann vom Sensorelement 30 erfaßt werden. Each of the two pole shoes 32, 34 is provided with a receiving piece 40, 42, each of which has a curved outer surface 44. The curved outer surface 44 of each receiving piece 40, 42 lies opposite the two flow guide pieces 26, 28 with a small air gap. Each receiving piece 40, 42 is measured in the circumferential direction with a length that corresponds to the angular range over which the carrier wheel 38 can be adjusted, that is to say over approximately 20 ° in the example shown. Wei ¬ further, the outer surface 44 of the receiving pieces is designed with such a curvature that the center of curvature of the surface lies on the central axis M of the drive shaft 12. This design ensures that, regardless of the respective position of the carrier wheel 38 relative to the magnet 22, the two pole shoes 32, 34 are coupled to the magnet 22 by means of the two receiving pieces 40, 42. Regardless of the position of the carrier wheel, a closed magnetic circuit is thus formed which, starting from the magnet 22 through the flux guide piece 28, the air gap between the flow guide piece 28 and the receiving piece 42, the receiving piece 42, the pole piece 34, the air gap between the pole piece 34 and the pulse generator wheel 14, the tooth 16 of the pulse generator wheel, the air gap between the pulse generator wheel 14 and the pole piece 32, the pole piece 32, the receiving piece 40, the air gap between the receiving piece 40 and the sensor element 30, the sensor element 30 and finally the flux guide piece 26 leads to the magnet 22. The magnetic flux intensity in this closed magnetic circuit changes periodically due to the passage of the teeth and the tooth spaces through the surface between the two pole shoes 32, 34 when the drive shaft and thus the pulse generator wheel 14 rotate. This variation of the magnetic flux can be detected by the sensor element 30 ,

Claims

Patentansprüche claims
1. Kraftstoffeinspritzpumpe mit einem Gehäuse (10), einer Antriebswelle (12), die in dem Gehäuse (10) drehbar gelagert ist, einem Impulsgeberrad (14) , das drehfest auf der Antriebswelle (12) angebracht ist, einem Tragerrad (38) , das von einem Spritzversteller relativ zum Gehäuse (10) und um die Mittelachse (M) der Antriebswelle (12) um einen bestimmten Winkelbereich verdreht werden kann, und einem Drehwinkel- sensor (20) , der ein Sensorelement (30) enthalt, dadurch gekennzeichnet, daß das Sensorelement (30) fest am Gehäuse angebracht ist.1. fuel injection pump with a housing (10), a drive shaft (12) which is rotatably mounted in the housing (10), a pulse generator wheel (14) which is non-rotatably mounted on the drive shaft (12), a carrier wheel (38), which can be rotated by a spray adjuster relative to the housing (10) and about the central axis (M) of the drive shaft (12) by a certain angular range, and a rotation angle sensor (20) which contains a sensor element (30), characterized in that that the sensor element (30) is firmly attached to the housing.
2. Kraftstoffeinspritzpumpe nach Anspruch 1, dadurch gekenn- zeichnet, daß der Drehzahlsensor einen Magneten (22) enthalt, der fest am Gehäuse (10) angebracht ist, und daß am Tragerrad (38) fest mindestens ein Aufnahmestuck (40, 42) angebracht ist, das dem am Gehäuse (10) angebrachten Magneten (22) zugewandt ist und sich über den bestimmten Wmkelbereich er- streckt.2. Fuel injection pump according to claim 1, characterized in that the speed sensor contains a magnet (22) which is fixedly attached to the housing (10), and that at least one receiving piece (40, 42) is fixedly attached to the support wheel (38) , which faces the magnet (22) attached to the housing (10) and extends over the specific winding area.
3. Kraftstoffeinspritzpumpe nach Anspruch 2, dadurch gekennzeichnet, daß das Aufnahmestuck (40, 42) eine gekrümmte Außenflache (44) hat, deren Krummungsmittelpunkt auf der Mitte- lachse (M) der Antriebswelle (12) liegt.3. Fuel injection pump according to claim 2, characterized in that the receiving piece (40, 42) has a curved outer surface (44) whose center of curvature lies on the central axis (M) of the drive shaft (12).
4. Kraftstoffeinspritzpumpe nach Anspruch 2 oder Anspruch 3, dadurch gekennzeichnet, daß zwei Aufnahmestucke (40, 42) vorgesehen sind sowie zwei Polschuhe (32, 34), von denen jeder auf einer Seite des Impulsgeberrades (14) angeordnet und mit einem der Aufnahmestucke (40, 42) verbunden ist, und daß der Magnet (22) mit zwei Flußleitstucken (26, 28) in Verbindung steht, die fest am Gehäuse (10) angebracht sind und durch einen Luftspalt von dem Aufnahmestuck (40, 42) getrennt sind. 4. Fuel injection pump according to claim 2 or claim 3, characterized in that two receiving pieces (40, 42) are provided and two pole pieces (32, 34), each of which is arranged on one side of the pulse generator wheel (14) and with one of the receiving pieces ( 40, 42), and that the magnet (22) communicates with two flux guide pieces (26, 28) which are fixedly attached to the housing (10) and separated by an air gap from the receiving piece (40, 42).
5. Kraftstoffeinspritzpumpe nach Anspruch 4, dadurch gekennzeichnet, daß das Sensorelement (30) an einem der Flußleitstücke (26) angebracht ist und daß das Flußleitstück (26) , das mit dem Sensorelement versehen ist, mit einer größeren Länge ausgeführt ist als das andere Flußleitstück (28). 5. Fuel injection pump according to claim 4, characterized in that the sensor element (30) is attached to one of the flow guide pieces (26) and that the flow guide piece (26), which is provided with the sensor element, is of a greater length than the other flow guide piece (28).
PCT/DE2000/003402 1999-09-30 2000-09-29 Fuel injection pump WO2001023740A1 (en)

Applications Claiming Priority (2)

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DE19946907.5 1999-09-30
DE1999146907 DE19946907A1 (en) 1999-09-30 1999-09-30 Fuel injection pump

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201600093157A1 (en) * 2016-09-15 2018-03-15 Bosch Gmbh Robert PUMP ASSEMBLY TO SUPPLY FUEL, PREFERABLY GASOIL, TO AN INTERNAL COMBUSTION ENGINE

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05306661A (en) * 1992-04-30 1993-11-19 Nippondenso Co Ltd Distribution type fuel injection pump
DE4344865A1 (en) 1993-12-29 1995-07-06 Bosch Gmbh Robert Fuel injection pump
JPH07180633A (en) * 1993-12-21 1995-07-18 Nippon Soken Inc Fuel injection pump
EP0675279A1 (en) * 1994-03-05 1995-10-04 Lucas Industries Public Limited Company Fuel injection pumping apparatus
JPH07279737A (en) * 1994-04-01 1995-10-27 Toyota Motor Corp Fuel injection control device for internal combustion engine

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05306661A (en) * 1992-04-30 1993-11-19 Nippondenso Co Ltd Distribution type fuel injection pump
JPH07180633A (en) * 1993-12-21 1995-07-18 Nippon Soken Inc Fuel injection pump
DE4344865A1 (en) 1993-12-29 1995-07-06 Bosch Gmbh Robert Fuel injection pump
EP0675279A1 (en) * 1994-03-05 1995-10-04 Lucas Industries Public Limited Company Fuel injection pumping apparatus
JPH07279737A (en) * 1994-04-01 1995-10-27 Toyota Motor Corp Fuel injection control device for internal combustion engine

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 018, no. 112 (M - 1565) 23 February 1994 (1994-02-23) *
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 10 30 November 1995 (1995-11-30) *
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 02 29 February 1996 (1996-02-29) *

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