US3914665A - Ignition coil - Google Patents

Ignition coil Download PDF

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Publication number
US3914665A
US3914665A US464945A US46494574A US3914665A US 3914665 A US3914665 A US 3914665A US 464945 A US464945 A US 464945A US 46494574 A US46494574 A US 46494574A US 3914665 A US3914665 A US 3914665A
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US
United States
Prior art keywords
ignition coil
relay
magnetic field
relays
reed
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
Application number
US464945A
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English (en)
Inventor
Frederick Stanley Johnson
Kenneth Longstaff
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.)
Rover Co Ltd
Original Assignee
Rover Co 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 Rover Co Ltd filed Critical Rover Co Ltd
Application granted granted Critical
Publication of US3914665A publication Critical patent/US3914665A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/12—Ignition, e.g. for IC engines
    • 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
    • F02P15/00—Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P1/00 - F02P13/00 and combined with layout of ignition circuits
    • F02P15/12—Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P1/00 - F02P13/00 and combined with layout of ignition circuits having means for strengthening spark during starting
    • 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
    • F02P7/02—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices of distributors
    • F02P7/03—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices of distributors with electrical means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/12—Ignition, e.g. for IC engines
    • H01F2038/125—Ignition, e.g. for IC engines with oil insulation

Definitions

  • IGNITION COIL This invention relates to an ignition coil.
  • a coil is used in a spark ignition internal combustion engine to produce a high voltage pulse for supply to a sparking plug.
  • the coil is a step-up transformer providing from a secondary coil a high voltage pulse in response to a low voltage fed to a primary coil.
  • an ignition coil comprises a transformer having a relatively small number of primary windings and a relatively large number of secondary windings and at least two reed-type relays each comprising a pair of contacts adapted to be closed or opened by means of a magnetic field; means adapted to generate a magnetic field for opening or closing each relay; one contact of each pair of the relay being adapted for connection to the secondary winding; the other contact of each pair being adapted for direct, or indirect, connection to a spark gap.
  • FIG. 1 is a sectioned elevation
  • FIG. 2 is a plan view of the coil when viewed in'the direction of arrow II in FIG. 1;
  • FIGS. 3 and 4 are circuit diagrams of two embodiments of means for controlling the relays described in connection with FIGS. 1 and 2.
  • FIGS. 1 and 2 A primary coil 11 of relatively few turns and a secondary coil 12 having relatively many turns are disposed in an oil filled casing 13.
  • the coils 11, 12 are electrically isolated from one another and disposed around a central core 14. Both coils 11, 12 and core 14 are mounted on an insulating pedestal 15.
  • the upper ends of the coils 11, 12 are located by an insulator 16 on which is mounted a magnetic screening component 17.
  • the secondary coil is electrically connected by a ring connector to one contact of each of four reed relays 18, 19, 20 and 21.
  • Each relay comprises a housing 23 containing a pair of reed relay contacts. In each housing the upper reed relay. contact projects outside the housing 23 and is coupled to a spark plug lead connector 24.
  • Each housing 23 comprises an evacuated glass tube and is surrounded by an annular solenoid 25 which, on the passage of a current, generates a magnetic field which serves to close the relay contacts of the housing. On the current ceasing the magnetic field collapses so allowing the contacts to spring apart to an open circuit disposition.
  • the upper part of casing 13 has mounted on it two terminals 26, 27 and a socket 28.
  • Terminal 26 is for linking the primary coil 11 to a source of low voltage pulses.
  • Terminal 27 is for linking annular solenoids 25 to a source of power.
  • Socket 28 is a four pin socket. Each pin is connected to one of the annular solenoids 25 to enable that solenoid to be energised by a pulse fed to terminal 27.
  • each of relays 18 to 21 In use when mounted in an engine ignition system each of relays 18 to 21 in turn are closed by completing the circuit of the appropriate annular solenoid 18 by way of socket 28 and terminal 27.. The resulting mag netic field causes the appropriate relay to close. Thereafter an ignition pulse is fed to terminal 26 and so primary coil 11. The transformer coupling between primary coil 11 and secondary coil 12 results in a high voltage pulse being fed to ring connector 10. As a consequence whichever relay is being held closed causes the-high voltage pulse to be fed to the connector 24 and so to an engine spark plug to cause an ignition spark.
  • the energised solenoid is de-energised to open the corresponding reed relay contacts.
  • the cycle is then repeated with the next reed relay in the sequence.
  • the reed relays described make use of an evacuated casing. If preferred an oil filled casing can be used to quench incipient sparking.
  • FIG. 3 shows an ignition system for a four cylinder internal combustion engine.
  • Reed relays 38 to 41 correspond to relays 18 to 21 in FIGS. 1 and 2.
  • Each relay 38 to 41 surrounded by, respectively, solenoids 42 to 45.
  • Relays 38 to 41 include, respectively, a first contact 46 to 49 and a second contact 50 to 53.
  • Each of the first contacts 46 to 49- is connected to a spark plug of known type.
  • Second contacts 50 to 53 are connected by a common line to a secondary coil in ignition coil 54 as previously described in connection with FIGS. 1 and 2.
  • Primary coil of ignition coil 54 receives pulses of appropriate amplitude from amplifier 55. The frequency of these pulses is regulated by input fed along line 56 from a computer module 57. This module is also used to energise in sequence solenoids 42 to 45. Timing of the module outputs is governed by signals fed to inputs 58 to 59.
  • Engine crankshaft 60 has mounted on it a mask 61.
  • the mask includes a gap which serves to allow light from a source 62 to pass once in every revolution of the shaft to a photo-electric cell 63.
  • the subsequent sequencing signal generated by the cell 63 is fed to input 58 of module 57.
  • Engine camshaft 64 has mounted on it a mask 65. This serves to periodically isolate a light source 66 from photo-electric cells 67. The subsequent reed drive signals generated during each revolution of camshaft 64 by photo-electric cells 67 are fed to input 59 of the module 57. The sequencing signal fed to input 58 of the module provides an angular datum to which the reed drive signals fed to input 59 can be related for the purpose of calibrating the ignition system.
  • Module 57 feeds outputs to lines 68 to 71 which are connected, respectively, to solenoids 42 to 45. The other side of the solenoids are grounded to a common line 72.
  • FIG. 4 shows an alternative ignition system for a four cylinder internal combustion engine.
  • Reed relays 75 to 78 correspond to relays 18 to 21 in FIGS. 1 and 2. Each relay is surrounded by, respectively, solenoids 79 to 82.
  • Relays 75 to 78 include, respectively, a first contact 83 to 86 and a second contact 87 to 90. Each of the first contacts is connected to a spark plug (not shown)-of known type.
  • Second contacts 87 to 90 are connected by a common line 91 to secondary coil of ignition coil 92 as previously described in connection with FIGS. 1 and 2.
  • Primary coil of ignition coil 92 receives voltage pulses from contact breaker contacts 93 along line 94. The contacts 93 are periodically opened and closed by action of rotating cam 95 on cam follower 96.
  • Breaker contacts feed by way of line 97 a voltage wave form, of the type indicated at A, as input to pulse shaper module 98.
  • This provides a substantially square wave, of the type indicated at B, to input 99 of logic cir- A
  • Logic circuit module 100 provides, on outputs 106 to v 109 pulses in the appropriate sequence toenergise solenoids 79 to 82.
  • An ignition coil comprising a transformer having a relatively small number of primary windings and a relatively large number of secondary windings and at least two reed-type relays each comprising a pair of contacts adapted to be closed or opened by means of a magnetic field; means adapted to provide a magnetic field for opening or closing each relay; one contact of each pair of the relay being adapted for connection to the secondary winding; the other contact of each pair being adapted for connection to a spark plug.
  • An ignition coil as claimed in claim 1 wherein the means adapted to generate a magnetic field for opening or closing each relay comprises a solenoid.
  • An ignition coil as claimed in claim 2 connected to a computer or logic module, said module being adapted to be connected to an internal combustion engine and to receive from said engine, as input, signals related to engine speed, and to consequently provide,

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
US464945A 1973-04-27 1974-04-29 Ignition coil Expired - Lifetime US3914665A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2010573 1973-04-27

Publications (1)

Publication Number Publication Date
US3914665A true US3914665A (en) 1975-10-21

Family

ID=10140472

Family Applications (1)

Application Number Title Priority Date Filing Date
US464945A Expired - Lifetime US3914665A (en) 1973-04-27 1974-04-29 Ignition coil

Country Status (7)

Country Link
US (1) US3914665A (enrdf_load_stackoverflow)
JP (1) JPS5048415A (enrdf_load_stackoverflow)
BE (1) BE814218A (enrdf_load_stackoverflow)
DE (1) DE2420400A1 (enrdf_load_stackoverflow)
FR (1) FR2227607B1 (enrdf_load_stackoverflow)
IT (1) IT1009972B (enrdf_load_stackoverflow)
SE (1) SE399463B (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2487014A1 (fr) * 1980-07-15 1982-01-22 Siemens Sa Systeme d'allumage pour moteurs a combustion interne
EP0034787B1 (de) * 1980-02-21 1985-05-15 Siemens Aktiengesellschaft Zündsystem für Brennkraftmaschinen
US5506478A (en) * 1994-03-23 1996-04-09 Daug Deutsche Automobilgesellschaft Mbh AC ignition system with optimized electronic circuit

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2649844C2 (de) * 1976-10-29 1986-11-20 Robert Bosch Gmbh, 7000 Stuttgart Zündanlage für Brennkraftmaschinen
DE2649732C2 (de) * 1976-10-29 1986-02-06 Robert Bosch Gmbh, 7000 Stuttgart Zündeinrichtung für Brennkraftmaschinen
US4269152A (en) * 1978-05-22 1981-05-26 The Bendix Corporation Breakerless pulse distribution system and opto-electrical distributor therefor
DE2831188A1 (de) * 1978-07-15 1980-01-24 Bosch Gmbh Robert Ruhende zuendspannungsverteilung fuer brennkraftmaschinen
JPS5934482A (ja) * 1982-08-21 1984-02-24 Mitsubishi Electric Corp 内燃機関点火装置
EP0321416A1 (en) * 1987-12-17 1989-06-21 INDUSTRIE MAGNETI MARELLI S.r.l. Ignition coil

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1335933A (en) * 1920-04-06 Hvvwvi
US2782247A (en) * 1950-08-17 1957-02-19 Gen Motors Corp Ignition distributor and coil unit
US3638630A (en) * 1970-05-20 1972-02-01 Gen Motors Corp Internal combustion engine ignition distributor cap and coil assembly
US3807378A (en) * 1972-03-23 1974-04-30 W Wernet Ignition system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1335933A (en) * 1920-04-06 Hvvwvi
US2782247A (en) * 1950-08-17 1957-02-19 Gen Motors Corp Ignition distributor and coil unit
US3638630A (en) * 1970-05-20 1972-02-01 Gen Motors Corp Internal combustion engine ignition distributor cap and coil assembly
US3807378A (en) * 1972-03-23 1974-04-30 W Wernet Ignition system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0034787B1 (de) * 1980-02-21 1985-05-15 Siemens Aktiengesellschaft Zündsystem für Brennkraftmaschinen
FR2487014A1 (fr) * 1980-07-15 1982-01-22 Siemens Sa Systeme d'allumage pour moteurs a combustion interne
US5506478A (en) * 1994-03-23 1996-04-09 Daug Deutsche Automobilgesellschaft Mbh AC ignition system with optimized electronic circuit

Also Published As

Publication number Publication date
FR2227607B1 (enrdf_load_stackoverflow) 1978-01-13
FR2227607A1 (enrdf_load_stackoverflow) 1974-11-22
BE814218A (fr) 1974-08-16
JPS5048415A (enrdf_load_stackoverflow) 1975-04-30
IT1009972B (it) 1976-12-20
SE399463B (sv) 1978-02-13
DE2420400A1 (de) 1974-11-14

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