EP0001354A1 - Système d'allumage - Google Patents

Système d'allumage Download PDF

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Publication number
EP0001354A1
EP0001354A1 EP78300404A EP78300404A EP0001354A1 EP 0001354 A1 EP0001354 A1 EP 0001354A1 EP 78300404 A EP78300404 A EP 78300404A EP 78300404 A EP78300404 A EP 78300404A EP 0001354 A1 EP0001354 A1 EP 0001354A1
Authority
EP
European Patent Office
Prior art keywords
spark
voltage
capacitor
accordance
engine
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Withdrawn
Application number
EP78300404A
Other languages
German (de)
English (en)
Inventor
Basil Earle Wainwright
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0001354A1 publication Critical patent/EP0001354A1/fr
Withdrawn legal-status Critical Current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
    • F02P3/00—Other installations
    • F02P3/06—Other installations having capacitive energy storage
    • F02P3/08—Layout of circuits
    • F02P3/09—Layout of circuits for control of the charging current in the capacitor
    • F02P3/093—Closing the discharge circuit of the storage capacitor with semiconductor devices
    • 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
    • F02P3/00—Other installations
    • F02P3/06—Other installations having capacitive energy storage
    • F02P3/08—Layout of circuits
    • F02P3/0876—Layout of circuits the storage capacitor being charged by means of an energy converter (DC-DC converter) or of an intermediate storage inductance
    • F02P3/0884—Closing the discharge circuit of the storage capacitor with semiconductor devices
    • 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
    • F02P9/00—Electric spark ignition control, not otherwise provided for
    • F02P9/002—Control of spark intensity, intensifying, lengthening, suppression
    • F02P9/007—Control of spark intensity, intensifying, lengthening, suppression by supplementary electrical discharge in the pre-ionised electrode interspace of the sparking plug, e.g. plasma jet ignition

Definitions

  • This invention relates to improvements in and relating to apparatus for producing spark ignition of an internal combustion engine.
  • the electrical sparks fed to the spark plugs of an internal combustion engine are conventionally produced by means of an ignition coil having its high voltage secondary winding connected to the engine's spark plugs through a distributor, and having its low voltage primary winding connected to a low voltage source, typically a 12 volt battery or an alternator system driven by the engine.
  • An engine driven switching device typically a mechanical contact breaker, produces interruptions in the current flowing in the coil's primary winding and consequently high voltage pulses are produced in the coil's secondary winding, which are applied to the spark plugs.
  • the present invention provides an apparatus for producing spark ignition of an internal combustion engine, comprising an ignition coil having primary and secondary windings, a capacitor connected to the primary winding, voltage generating means for receiving a supply voltage and arranged to charge the capacitor to a voltage greater than the supply voltage, switching means arranged to cause the capacitor to discharge through the primary winding and thereby produce in the secondary winding a voltage pulse for producing spark ignition of the engine, and control means arranged to apply to the output of the secondary coil a direct current capable of sustaining a spark established by said voltage pulse.
  • the control means can be arranged to operate to sustain each spark for substantially the entire operative firing period of the cylinder of the engine in which the spark is produced, thereby producing an improved combustion in the cylinder.
  • Each spark can be terminated for example by means of a switching device arranged to switch off said high voltage direct current after a predetermined spark duration, and the switching device can conveniently be responsive to the operation of the engine's distributor.
  • the said high voltage direct current is arranged to be of such a magnitude that the spark is extinguished automatically by a rise in gas pressure which occurs in the cylinder as a result of combustion of a fuel/air mixture therein by the spark.
  • the voltage required to sustain the spark increases with increased gas pressure in the cylinder, and that by appropriately selecting the magnitude of said high voltage produced by the control means, it is possible to arrange for the spark discharge in the cylinder to become cut off by the increased gas pressure resulting from combustion of the fuel/air mixture in the cylinder.
  • the gas pressure increases as a result of the combustion, it reaches a level which precludes the said high voltage direct current from sustaining the spark, and consequently the spark is extinguished.
  • control means comprises a d.c./d.c. converter for producing from a low voltage input supply, of typically 12 volts from the engine's battery or alternator system, a high d.c. voltage of typically 3000 volts.
  • voltage generating means preferably comprises a d.c./d.c. converter for producing from said low voltage supply a charging voltage of typically 200 volts for the capacitor.
  • the apparatus comprises a conventional ignition coil 1 having a primary winding 1a and a secondary winding ib connected through a conventional distributor 2 to spark plugs 3 of the engine.
  • the primary winding la is connected in series with a capacitor C and a switching thyristor SCR.
  • the capacitor is charged to a voltage of typically 200 volts by means of a d.c./d.c. converter 4, which has its input connected to terminals 5 that are connected to a low voltage supply of typically 12 volts derived from the engine's battery and alternator system.
  • the thyristor SCR is fired by a drive circuit 6 responsive to operation of a contact breaker 7.
  • the contact breaker can be of the conventional mechanical kind or of the photoelectric or magnetic types more recently developed.
  • a d.c./d.c. converter 8 Connected in series with the secondary winding 1b of the coil is a d.c./d.c. converter 8 which produces from the 12 volt.supply a high voltage d.c. current of typically 3 KV.
  • the capacitor C is charged by the converter 4, and upon operation of the contact breaker 7, the drive circuit fires the thyristor SCR causing the capacitor C to discharge through the primary winding la of the coil.
  • a high voltage pulse is induced by the coil's secondary winding, the pulse being applied to one of the spark plugs 3 through the distributor 2.
  • the magnitude of the voltage pulse is sufficient to initiate a spark that ignites fuel/ air mixture in a cylinder of the engine, but the discharge of capacitor only produces a voltage pulse of a short duration compared with the period in the engine's cycle that it is desirable to maintain the spark in order to optimise combustion of the fuel/air mixture in the cylinder
  • the duration of the spark is however extended beyond the duration of the discharge of the capacitor, by the action of the converter 8.
  • the high voltage d.c. output of the converter 8 is of insufficient magnitude alone to initiate the spark, but once the spark has been started by the high voltage pulse induced in the winding ib, a high voltage direct current flows from the converter 8-to sustain the spark after the high voltage pulse has died away, and effect a complete combustion of the fuel/ air mixture in the cylinder.
  • the gas pressure in the cylinder momentarily rises.
  • the voltage required to sustain the spark increases with increased gas pressure, and this effect is used in the present apparatus to extinguish the spark.
  • the magnitude of voltage produced by the converter 8 is selected so that the spark will be quenched when the gas pressure in the cylinder rises to a selected level which indicates a satisfactory combustion of the fuel/air mixture.
  • the voltage produced by the converter 8 will be insufficient to sustain the spark which will then be terminated.
  • the voltage level produced by the converter 8 will be selected to suit the operating characteristics of the engine concerned.
  • the high voltage pulse produced by the discharge of the capacitor need only be sufficient to initiate the spark, the spark being sustained by the d.c./d.c. converter 8.
  • a switching device could be provided to disconnect the converter 8 from the coil.
  • the switching device could operate in response to operation of the contact breaker.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
EP78300404A 1977-09-21 1978-09-20 Système d'allumage Withdrawn EP0001354A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB3939377 1977-09-21
GB3939377 1977-09-21

Publications (1)

Publication Number Publication Date
EP0001354A1 true EP0001354A1 (fr) 1979-04-04

Family

ID=10409311

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78300404A Withdrawn EP0001354A1 (fr) 1977-09-21 1978-09-20 Système d'allumage

Country Status (3)

Country Link
EP (1) EP0001354A1 (fr)
GB (1) GB2005767A (fr)
IT (1) IT1108540B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0028899A1 (fr) * 1979-11-07 1981-05-20 Ultimate Holdings S.A. Appareil pour produire l'étincelle d'allumage pour moteur à combustion interne
US5188088A (en) * 1989-07-28 1993-02-23 Volkswagen Ag Electronic ignition system for an internal combustion engine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8725702D0 (en) * 1987-11-03 1987-12-09 Wainwright B E Ignition apparatus
GB2245648A (en) * 1990-06-29 1992-01-08 Champion Spark Plug Europ I.c.engine ignition system
CN111779608B (zh) * 2020-06-30 2021-09-24 上海交通大学 一种高频高能量火花放电点火装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2068903A5 (fr) * 1969-09-25 1971-09-03 Bendix Corp
FR2149929A5 (fr) * 1971-08-06 1973-03-30 Bosch Gmbh Robert
US3921606A (en) * 1972-11-27 1975-11-25 Ducellier & Cie Ignition device for an internal combustion engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2068903A5 (fr) * 1969-09-25 1971-09-03 Bendix Corp
FR2149929A5 (fr) * 1971-08-06 1973-03-30 Bosch Gmbh Robert
US3921606A (en) * 1972-11-27 1975-11-25 Ducellier & Cie Ignition device for an internal combustion engine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0028899A1 (fr) * 1979-11-07 1981-05-20 Ultimate Holdings S.A. Appareil pour produire l'étincelle d'allumage pour moteur à combustion interne
US5188088A (en) * 1989-07-28 1993-02-23 Volkswagen Ag Electronic ignition system for an internal combustion engine

Also Published As

Publication number Publication date
IT7869183A0 (it) 1978-09-21
IT1108540B (it) 1985-12-09
GB2005767A (en) 1979-04-25

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

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STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn
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