EP0116542B1 - Construction d'un distributeur et generateur de signaux - Google Patents

Construction d'un distributeur et generateur de signaux Download PDF

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Publication number
EP0116542B1
EP0116542B1 EP19820903091 EP82903091A EP0116542B1 EP 0116542 B1 EP0116542 B1 EP 0116542B1 EP 19820903091 EP19820903091 EP 19820903091 EP 82903091 A EP82903091 A EP 82903091A EP 0116542 B1 EP0116542 B1 EP 0116542B1
Authority
EP
European Patent Office
Prior art keywords
ring
engine
intermediate shaft
sensor
magnet
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
Application number
EP19820903091
Other languages
German (de)
English (en)
Other versions
EP0116542A1 (fr
EP0116542A4 (fr
Inventor
David H. Fox
Charles C. Kostan
Frank B. Casaceli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ford Werke GmbH
Ford France SA
Ford Motor Company Ltd
Original Assignee
Ford Werke GmbH
Ford France SA
Ford Motor Company Ltd
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 Ford Werke GmbH, Ford France SA, Ford Motor Company Ltd filed Critical Ford Werke GmbH
Publication of EP0116542A1 publication Critical patent/EP0116542A1/fr
Publication of EP0116542A4 publication Critical patent/EP0116542A4/fr
Application granted granted Critical
Publication of EP0116542B1 publication Critical patent/EP0116542B1/fr
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P7/00—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices
    • F02P7/06—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices of circuit-makers or -breakers, or pick-up devices adapted to sense particular points of the timing cycle
    • F02P7/067—Electromagnetic pick-up devices, e.g. providing induced current in a coil
    • F02P7/0677—Mechanical arrangements

Definitions

  • This invention relates to a timing system for an internal combustion engine for producing an electrical signal in synchronism with the periodic movement of an engine part.
  • Known distributors have signal generating apparatus including a fixed magnet with turning vanes which change the intensity of the magnetic field adjacent the magnet.
  • An inductive sensor adjacent the magnet can sense these field fluctuations.
  • U.S. Patent 4,235,213 to Jellissen teaches an ignition system having a Hall effect sensor with a magnetic circuit positioned to provide magnetic flux through the Hall effect sensor.
  • the magnetic flux through the Hall effect sensor is interruptable by a high permeability vane moving through the air gap in the magnetic cicuit, activating the Hall effect sensor to provide timing signals for an automotive ignition distributor system.
  • a housing in an automotive ignition distributor system is mounted on a swing arm pivotal about the axis of a distributor shaft.
  • the housing contains a magnetic circuit and a circuit board having a Hall effect sensor affixed thereto.
  • U.S. Patent 4,223,249 issued to Eschelman teaches a bistable magnetic wire having an electrically conductive wire coil thereabout to form a magnetic wire assembly adjacent the magnet.
  • the ends of the conductive wire are electrically connected to a sensing apparatus.
  • a shield or shutter arrangement operated between the magnetic wire assembly and the magnet serves to cause the magnetic wire to be at times placed under the influence of the magnetic field of the magnet thereby resulting in the magnetic wire changing from one stable state to another state. In so changing states, a voltage is induced into the inductive wire to produce a pulse across the ends of the wire.
  • U.S. Patent 4,165,726 issued to Helmer teaches a distributor 10 which is coupled to an engine 28. Extending downwardly from the housing for the distributor is an integrally formed tubular shank or end portion 20 with a stepped mounting flange 22 at its lower end, which is received in an opening and is suitably secured to the engine block.
  • Stem portion 20 includes an upper thrust bearing 23 and a lower sleeve bearing 24 in which is journaled the distributor rotor shaft 26, which is formed of machined steel and is suitably coupled to and rotatably driven from the electrically grounded engine.
  • crankshaft and the rotating portion of the distributor providing a signal indicative of crankshaft position is both expensive and prone to various inaccuracies. That is, any looseness in the coupling between the crankshaft and the signal generating device would cause an erroneous indication of crankshaft position. Further, an accurate transmission of crankshaft movement requires relatively close manufacturing tolerances which are typically expensive. A simpler, more direct coupling between the crankshaft and the distributor would be desirable.
  • U.S. Patent 3,308,341 discloses an ignition system for internal combustion engine which utilizes a segmental magnetically charged disc for actuation of a reed type switching device to actuate a timing system which controls the operation of an ignition coil.
  • the distributor includes a housing and a distributor shaft which extends upwardly into the housing and drives a drive plate.
  • the drive plate is connected through the usual spring biased fly weights and drive pins to a centrifugal advance plate.
  • the advance plate drives a rotor shaft carrying a cam which may be the conventional type used to operate mechanical break points.
  • a grommet of rubber or plastic is fitted over the cam which carries the magnetic disc.
  • the magnetic reed switch is placed adjacent the periphery of the magnetic disc.
  • a timing system for an internal combustion engine for producing an electric signal in synchronism with the periodic movement of an engine part, said signal being subjected to a variable phase shift and controlling a cyclic operation of said engine, comprising a permanently magnetized ring (14) mounted for rotation with the engine camshaft (20) and orientated in a plane perpendicular to the axis of rotation, said ring having a plurality of alternating north and south magnetic poles, and sensor means (54) positioned adjacent said magnetic poles on said ring (14) which switches on and off in response to the passage of said magnetic poles past thereof, characterised in that said ring (14) is directly coupled to an intermediate shaft (12) which is directly coupled to the engine camshaft (20) and said sensor means is a bipolar Hall-type sensor (54) for detecting and distinguishing positive and negative magnetic flux after experiencing a zero flux condition.
  • distributor 10 is directly mounted on a camshaft 20 of an engine 22.
  • An intermediate shaft 12 is mounted and oriented directly on camshaft 20 eliminating the need for any bearings.
  • a ring-like magnet 14 is positioned on intermediate shaft 12 to provide an indication of the rotational position of intermediate shaft 12, of camshaft 20 and therefore of the engine crankshaft. Magnetic poles are induced in magnet 14 after magnet 14 is positioned on intermediate shaft 12.
  • Such in place charging of magnet 14 (Fig. 5) permits accurate correlation between the rotational position of the magnetic poles on magnet 14 and the rotational position of the crankshaft in engine 22. As a result, it is possible to compensate for manufacturing tolerances which may otherwise contribute to inaccuracies.
  • Intermediate shaft 12 is a generally hollow cylinder with decreasing diameter toward the end mounted on the outer diameter of camshaft 20.
  • a screw 34 in combination with a washer 36 is attached to a mounting stud 30 and engages an insert 38 coupled to intermediate shaft 12 thereby securing intermediate shaft 12 to mounting stud 30.
  • Mounting stud 30 has a threaded portion 31 which screws into the central opening of camshaft 20.
  • Intermediate shaft 12 has a plurality of radial, circumferentially spaced openings at the end adjacent camshaft 20.
  • Insert 38 is a web that extends through the radial openings in intermediate shaft 12 and has integral circumferential ring-like portions both inside and outside intermediate shaft 12.
  • Intermediate shaft 12 is formed of a combination of powdered metal and plastic.
  • insert 38 is also formed of a plastic and powdered metal combination and formed in place by injection around intermediate shaft 12.
  • a lip seal 42 between insert 38 and engine head 24 acts as a seal to keep oil passages 26 around camshaft 20 from leaking from engine 22.
  • a shoulder portion 64 of intermediate shaft 12 supports magnet 14 as shown in Fig. 2. Shoulder portion 64 has circumferential, outwardly facing teeth 66. Magnet 14 (Fig. 3) has circumferential, inwardly facing teeth 68 for engaging teeth 66.
  • Rotor 46 carries a staple-like electrode 48 and spring 50.
  • the mounting of spring 50 on rotor 46 is accomplished by a compression fit and uses no secondary mounting process such as a rivet or a heat stake.
  • Rotor 46 includes a clamp-like ledge 47 to hold down spring 50.
  • a back stop 49 acts in cooperation with ledge 47 to positively hold spring 50 to rotor 46.
  • Staple-like electrode 48 reduces cost of manufacturing.
  • the wire drawn material minimizes material costs and weight.
  • the staple form can be obtained by relatively low cost tooling.
  • the sharp pointed electrode design also reduces the generation of high levels of radio frequency interference.
  • Sensor 54 (Figs. 1 and 5) is coupled to an electronic engine control and provides crankshaft position information.
  • Sensor 54 is a bipolar Hall-type device. The bipolar feature results in a sensor that switches on and off by being subjected to a positive magnetic flux and a negative magnetic flux after experiencing a zero flux condition at transitions between positive and negative magnetic flux.
  • a positive magnetic flux is associated with the passage of a north magnetic pole on magnet 14 and a negative magnetic flux is associated with the passage of a south magnetic pole on magnetic 14.
  • a sensor holder 52 (Figs. 1, 5 and 7) is mounted on head 24 and supports bipolar Hall-type sensor 54 in proximity to magnet 14.
  • Sensor holder 52 includes charging tool locating holes 56 for receiving pins 72 positioning a charging tool 70 to charge magnet 14 (see Fig. 5). Accordingly, after magnet 14 is positioned on intermediate shaft 12, sensor holder 52 is mounted on head 24,'and the engine position is determined to be in a known position (such as top dead center of cylinder one).
  • Sensor holder 52 also supports distributor cap 58 in proximity to spring 50 and electrode 48 so that a firing voltage can be supplied through a central electrode 60 to spring 50 and distributed through electrode 48 to a plurality of spark plug associated electrodes 62 (Fig. 1).
  • Charging tool 70 (Figs. 4 and 5) is generally circular with a protruding handle 74.
  • a circular pilot 76 extends along the axis of charging tool 70 for engaging the central opening of intermediate shaft 12.
  • a pair of pins 72 extend parallel to pilot 76 for engaging locating holes 56.
  • a partially hollow cylindrical portion 78 extends around pilot 76 along the outside of intermediate shaft 12 to magnet 14.
  • An undulating conductor bus bar 80 is supported by cylindrical portion 78 adjacent magnet 14. The undulations are, in sequence, axially upward, circumferential, axially downward, circumferential, axially upward, and so on.
  • the axial portions of bus bar 80 are spaced about 45° apart so that current flowing in bus bar 80 induces eight magnet poles in magnet 14.
  • Magnet 14 is mounted on intermediate shaft 12 as an uncharged injection molded plastic magnet containing oriented magnetic dipoles.
  • the engine crankshaft is positioned to a known position (relative to top dead center of cylinder number one) and a magnetizing fixture is located relative to sensor 54 and magnet 14. At this point, torque can be applied to camshaft 20 to take up any timing belt looseness and the magnet 14 is magnetized.
  • Ring-like magnet 14 is magnetized relative to a known engine position so that the 45° north and south poles are generated alternately over the outer diameter of the magnetic in a location such that the sensor switches at a prescribed point relative to the known engine position.
  • bipolar Hall-type sensor 54 is potted in the plastic base which is mounted directly to the engine head to assure a positive known location in relation to the rotation of the magnet.
  • the crankshaft can be located at 35° after top dead center (ATDC) so that charging conductors can be equally spaced around sensor. This will result in a signal being generated at 10° before top dead center (BTDC) by the sensor during engine operation.
  • Sensor 54 is triggered by a low magnetic flux level, such as plus and minus 50 gauss around a zero flux transition point, and its sensitivity to air gap size, temperature and run-out variation is minimal.
  • the maximum amplitude of magnetic flux at the pole face is approximately 900 gauss.
  • Sensor holder 52 also contains a pole piece 55 (Fig. 1) adjacent sensor 54 to focus the magnetic flux from magnet 14 thereby concentrating the flux to improve the accuracy of sensor 54.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Abstract

Un distributeur (10) comporte un anneau magnétique (14) monté sur un arbre intermédiaire couplé directement à un arbre à cames (20). Un détecteur (54) possède une position connue par rapport aux pôles de l'anneau magnétique (14) et est monté sur une partie stationnaire du moteur (22).

Claims (9)

1. Dispositif de déclenchement, pour moteur à combustion interne permettant de produire un signal électrique en synchronisme avec le mouvement périodique d'un élément du moteur, ce signal étant soumis à un déphasage variable et commandant un fonctionnement cyclique du moteur, ce dispositif comprenant un anneau aimanté de manière permanente (14) qui est monté de façon à pouvoir tourner avec l'arbre à cames (20) du moteur et est orienté dans un plan perpendiculaire à l'axe de rotation, cet anneau présentant plusieurs pôles magnétiques nord et sud alternés, et des moyens de détection (54) qui sont disposés à proximité de ces pôles magnétiques de l'anneau (14) et qui sont mis en et hors circuit sous l'effet du passage de ces pôles magnétiques devant lui, caractérisé en ce que cet anneau (14) est directement accouplé à un arbre intermédiaire (12) qui est directement accouplé à l'arbre à cames (20) du moteur et en ce que les moyens de détection sont constitués par un capteur à effet Hall bipolaire (54) permettant de détecter des flux magnétiques positif et négatif, et de les distinguer, après avoir rencontré un état à flux zéro.
2. Dispositif selon la revendication 1, caractérisé en ce que les moyens de détection sont accouplés à une partie fixée qui est montée directement sur une partie fixe du moteur.
3. Dispositif selon la revendication 1 ou 2, caractérisé en ce qu'il comprend en outre un rotor qui porte une électrode permettant de faire passer une tension d'allumage et qui est accouplé à l'arbre intermédiaire.
4. Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'arbre intermédiaire présente sensiblement le même diamètre extérieur que le diamètre intérieur dudit anneau afin de permettre un emboîtement à frottement doux, et en ce que le détecteur à effet Hall bipolaire est mis en place dans un boitier magnétique dans une position située à distance de l'aimant dans le sens radial.
5. Dispositif selon la revendication 4, caractérisé en ce que l'aimant présente une rainure de clavette afin d'empêcher une rotation relative entre l'arbre intermédiaire et l'anneau.
6. Dispositif selon la revendication 5, caractérisé en ce que l'arbre intermédiaire présente une nervure de support qui présente des dents espacées de manières circonférentielle, ainsi qu'un orifice-pilote sensiblement axial, et en ce que l'anneau présente des dents réparties sur un cercle et faisant face sensiblement vers l'intérieur, à proximité de la nervure de support, de sorte que les dents de cet anneau engrènent avec les dents de l'arbre intermédiaire, ce qui solidarise en rotation cet anneau par rapport à cet arbre intermédiaire.
7. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comprend une tête d'allumeur permettant de fournir une énergie à tension élevée à des bougies d'allumage.
8. Dispositif selon la revendication 1, caractérisé en ce qu'il comprend un porte-capteur qui est directement accouplé au bloc moteur afin de maintenir le capteur à effet Hall bipolaire à proximité, avec un certain espacement, de l'anneau, ce porte-capteur comprenant un orifice destiné à être utilisé au cours de l'assemblage du dispositif pour recevoir un doigt d'un organe d'aimantation de l'anneau, ce qui fixe ainsi en rotation la relation existant entre l'anneau mobile et le capteur.
9. Dispositif selon la revendication 8, caractérisé en ce qu'il existe un espace suffisant à proximité de l'anneau pour recevoir une barre conductrice permettant de transporter un courant servant à aimanter cet anneau.
EP19820903091 1982-08-27 1982-08-27 Construction d'un distributeur et generateur de signaux Expired EP0116542B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1982/001167 WO1984000999A1 (fr) 1982-08-27 1982-08-27 Construction d'un distributeur et generateur de signaux

Publications (3)

Publication Number Publication Date
EP0116542A1 EP0116542A1 (fr) 1984-08-29
EP0116542A4 EP0116542A4 (fr) 1985-02-18
EP0116542B1 true EP0116542B1 (fr) 1987-11-11

Family

ID=22168161

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820903091 Expired EP0116542B1 (fr) 1982-08-27 1982-08-27 Construction d'un distributeur et generateur de signaux

Country Status (4)

Country Link
EP (1) EP0116542B1 (fr)
JP (1) JPS59501469A (fr)
DE (1) DE3277633D1 (fr)
WO (1) WO1984000999A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9532826B2 (en) 2013-03-06 2017-01-03 Covidien Lp System and method for sinus surgery

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3308341A (en) * 1964-02-10 1967-03-07 Motorola Inc Transistorized ignition system utilizing a magnetically actuated reed switch
GB1222404A (en) * 1968-09-27 1971-02-10 Vauxhall Motors Ltd Internal combustion engine ignition systems
US4003359A (en) * 1974-02-11 1977-01-18 Hays Bill J Flux wheel for breakerless distributor retrofit
FR2345755A1 (fr) * 1976-02-04 1977-10-21 Thomson Csf Systeme utilisant un element magnetosensible pour engendrer un signal electrique en synchronisme avec le mouvement periodique d'une piece, et application aux moteurs a combustion interne
US4155340A (en) * 1977-03-28 1979-05-22 Gulf & Western Manufacturing Company Solid state ignition system
US4165726A (en) * 1977-10-05 1979-08-28 Chrysler Corporation Low mass breakerless ignition distributor

Also Published As

Publication number Publication date
EP0116542A1 (fr) 1984-08-29
DE3277633D1 (en) 1987-12-17
EP0116542A4 (fr) 1985-02-18
JPS59501469A (ja) 1984-08-16
WO1984000999A1 (fr) 1984-03-15

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