EP0044744A2 - Procédé pour l'obtention d'un signal électrique dans une installation d'allumage et dispositif correspondant - Google Patents
Procédé pour l'obtention d'un signal électrique dans une installation d'allumage et dispositif correspondant Download PDFInfo
- Publication number
- EP0044744A2 EP0044744A2 EP81303345A EP81303345A EP0044744A2 EP 0044744 A2 EP0044744 A2 EP 0044744A2 EP 81303345 A EP81303345 A EP 81303345A EP 81303345 A EP81303345 A EP 81303345A EP 0044744 A2 EP0044744 A2 EP 0044744A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- sensor
- hall effect
- magnetic field
- signal
- providing
- 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.)
- Withdrawn
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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
- F02P7/07—Hall-effect pick-up devices
Definitions
- This invention relates to a method of providing an electrical signal in an ignition system.
- a second aspect of the invention relates to a device for use in the method and the invention also relates to a spark ignition internal combustion engine which includes the device.
- a spark ignition internal combustion engine requires a triggering device for providing a signal at predetermined stages in the operating cycle of the engine.
- the signal is fed to a system of primary and secondary windings which act as an energy store and transformer. From there,energy is discharged to a spark plug or, via a distributor, to one of a plurality of spark plugs.
- a common form of ignition triggering device comprises a pair of pivoted contacts and a cam for opening the contacts. The cam is rotated by the engine.
- An advance over this form of triggering device comprises an electromagnetic transducer adapted to respond to the movement of magnetic material forming part of a rotor which is mounted for rotation in association with the cam.
- known electromagnetic transducers fail to provide a sharp signal in response to an instantaneous position of the rotor.
- Transducers are not able to respond precisely to a small change in a magnetic field and there occur variations in the angular positions of the rotor at which a spark is produced at a spark plug of the engine. Magnetic "noise" can increase the problem and even cause the engine to mis-fire.
- the sensor's response depends precisely on the angular position of the rotor.
- the sensor is not sensitive to moderate variations in the distance between the sensor and magnetic poles of the body or to magnetic noise.
- a device comprising first and second elements, the first element being mounted for rotation relative to the second, wherein one of the elements is a body with which there is associated a magnetic field and the other element is a sensor, the sensor being arranged in proximity to the body and adapted to respond to a reversal in direction of the magnetic field of the body at the sensor arising from said rotation of the first element by providing an output signal.
- spark ignition internal combustion engine having an ignition system which includes a spark plug, a control unit for controlling the discharge of electrical energy at the spark plug, a device according to the second aspect of the invention and means for rotating the first element at a speed dependent on the speed of operation of the engine.
- the senor is a Hall effect device, comprising a Hall effect element, a multi-vibrator and an amplifier element, which is connected with the control unit by a single lead along which there passes a signal which triggers the discharge of energy at the spark plug.
- the multi-vibrator is a Schmitt trigger element.
- the four stroke internal combustion engine shown in Figure 1 has an ignition system with four spark plugs 23, a control unit 20 and distributing means in a housing 22 for distributing an electrical pulse to the appropriate spark plug in the firing sequence of the engine.
- the distributing means is of known construction and includes a rotor arm (not shown) mounted at one end of a shaft 12.
- the engine includes means for rotating the shaft at a speed which is directly related to the speed of the engine.
- the device for providing a signal to the control unit 20 at predetermined stages in the operating cycle of the engine.
- the device includes a sensor 11 and a body in the form of a ring 10 with which there is associated a magnetic field and which is mounted on the shaft 12.
- the sensor is a Hall effect device and is connected with the control unit 20 by a single lead 19.
- the sensor 11 is also earthed.
- the magnetic ring 10 conveniently includes a metal annulus 14 which is symmetrical about a plane perpendicular to the axis of rotation of the ring.
- the outer surface 15 of the ring is composed of a magnetisable material wherein magnetic poles are induced upon the outer surface in a known manner.
- the outer surface of the ring 10 is presented by the metal annulus.
- the magnetic material at the outer surface of the ring may be composed of ferrite particles embedded in a plastics matrix.
- the outer surface is of smoothly extending cylindrical shape and is coaxial with the shaft 12.
- the magnetic poles are induced with pole faces forming part of the outer surface of the magnetic ring and with at least one North pole face and at least one South pole face adjacent to each other. By this we mean that there is no unmagnetized region between them.
- the number of pairs of pole faces is selected according to the number of spark plugs.
- the Hall effect device 11 is arranged in proximity to the magnetic ring 10.
- proximity we mean that the Hall effect device is spaced perpendicularly from a closest point on the outer surface 15 of the magnetic ring by a distance which is less than the radius of the ring.
- the device 11 is spaced from the ring 10 just sufficiently to avoid contact between them.
- the Hall effect device 11 contains a Hall effect element 17, as shown in Figure 3, in which a potential difference is induced in response to the moving magnetic field of the rotating ring 10.
- the direction of the magnetic field across the element that is to say the direction of the radial component of a magnetic field associated with the ring, determines the polarity of the potential difference in the Hall effect element.
- this component will reverse when the element is equidistant from a North pole face and an adjacent South pole face of the ring 10. Because there is no unmagnetised region between the pole faces, the reversal of voltage in the Hall effect element is abrupt and occurs reliably when the ring 10 occupies a predetermined angular position.
- the Hall effect device 11 also comprises a Schmitt trigger multi-vibrator 18 and an amplifier element 24 in series with the Hall effect element 17.
- the Schmitt trigger has two stable states which are determined by the polarity of the input voltage applied to the Schmitt trigger, i.e. the voltage induced in the Hall effect element.
- the output from the Schmitt trigger is amplified by the amplifier element 24 to provide an output of approximately 35 mA along the single lead 19 when a positive voltage is induced in the Hall effect element and one of approximately 5 mA when a negative voltage is induced.
- the single lead also provides a supply voltage to the Schmitt trigger.
- the Hall effect element, Schmitt trigger and amplifier element form an integrated circuit.
- the resistor 25 is a current limiting resistor.
- each cycle of the engine there may be provided a number of pulses which is dependent upon the number of pairs of pole faces upon the magnetic ring 10, at a frequency dependent upon the rate of rotation of the ring.
- the control unit 20 includes known means, for example a capacitor and an ignition coil, for storing energy and known means for discharging the stored energy via a lead 26 and the distributing means in the housing 22 to the plugs 23 in accordance with the pulses fed to the control unit by the Hall effect device.
- known means for example a capacitor and an ignition coil
- the control unit 20 includes a switching means TR4 which operates in accordance with the changes in current flow in the single lead 19. Attendant changes in the voltage in the single lead are substantially eliminated by the zener diode D1.
- the transistor TR1 provides a compensating means which ensures that the voltage drop between the positive terminal of a battery of the vehicle and the single lead is substantially constant.
- the circuit of the control unit, other than the ignition coil, is shown in Figure 4.
- the magnetic ring 10 may be fitted as a modification to a cam on the shaft 12 of an internal combustion engine. Fixed and movable electrical switch contacts are removed and the magnetic ring is pushed onto the cam. The Hall effect device 11 is then fitted in proximity to the magnetic ring. Alternatively the magnetic ring may be fitted directly onto a shaft during manufacture. The Hall effect device is largely enclosed by a plastics cover when in use.
- the ring 10 Whilst we prefer to form the ring 10 and subsequently induce magnetic poles on the ring, it is within the scope of the invention for the ring to comprise an assembly of several parts, each part being magnetised before the parts are assembled together to form the ring.
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)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8023944 | 1980-07-22 | ||
GB8023944 | 1980-07-22 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0044744A2 true EP0044744A2 (fr) | 1982-01-27 |
EP0044744A3 EP0044744A3 (fr) | 1982-03-10 |
Family
ID=10514941
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81303345A Withdrawn EP0044744A3 (fr) | 1980-07-22 | 1981-07-22 | Procédé pour l'obtention d'un signal électrique dans une installation d'allumage et dispositif correspondant |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP0044744A3 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4641625A (en) * | 1984-10-10 | 1987-02-10 | Industrial Trade Exchange, Inc. | Fuel control system |
FR2622933A1 (fr) * | 1987-11-09 | 1989-05-12 | Mitsubishi Electric Corp | Rotor generateur de signaux d'un distributeur pour un moteur a combustion interne et procede pour sa fabrication |
EP0830504A1 (fr) * | 1995-06-07 | 1998-03-25 | International Machinery Corporation | Systemes d'allumage |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3875920A (en) * | 1974-02-04 | 1975-04-08 | Manufacturing Technology Enter | Contactless ignition system using hall effect magnetic sensor |
DE2646797A1 (de) * | 1976-10-16 | 1978-04-20 | Bosch Gmbh Robert | Kontaktloser impulsgeber fuer zuendanlagen |
FR2389012A1 (fr) * | 1977-04-25 | 1978-11-24 | Motorola Inc | Installation d'allumage de moteurs a combustion interne |
US4155340A (en) * | 1977-03-28 | 1979-05-22 | Gulf & Western Manufacturing Company | Solid state ignition system |
-
1981
- 1981-07-22 EP EP81303345A patent/EP0044744A3/fr not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3875920A (en) * | 1974-02-04 | 1975-04-08 | Manufacturing Technology Enter | Contactless ignition system using hall effect magnetic sensor |
DE2646797A1 (de) * | 1976-10-16 | 1978-04-20 | Bosch Gmbh Robert | Kontaktloser impulsgeber fuer zuendanlagen |
US4155340A (en) * | 1977-03-28 | 1979-05-22 | Gulf & Western Manufacturing Company | Solid state ignition system |
FR2389012A1 (fr) * | 1977-04-25 | 1978-11-24 | Motorola Inc | Installation d'allumage de moteurs a combustion interne |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4641625A (en) * | 1984-10-10 | 1987-02-10 | Industrial Trade Exchange, Inc. | Fuel control system |
FR2622933A1 (fr) * | 1987-11-09 | 1989-05-12 | Mitsubishi Electric Corp | Rotor generateur de signaux d'un distributeur pour un moteur a combustion interne et procede pour sa fabrication |
EP0830504A1 (fr) * | 1995-06-07 | 1998-03-25 | International Machinery Corporation | Systemes d'allumage |
EP0830504A4 (fr) * | 1995-06-07 | 1998-08-19 | Int Machinery Corp | Systemes d'allumage |
Also Published As
Publication number | Publication date |
---|---|
EP0044744A3 (fr) | 1982-03-10 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Designated state(s): AT BE CH DE FR GB IT NL SE |
|
AK | Designated contracting states |
Designated state(s): AT BE CH DE FR GB IT NL SE |
|
17P | Request for examination filed |
Effective date: 19820607 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19840314 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: GUNTON, BRUCE STANLEY |