US2748318A - Electric spark ignition apparatus - Google Patents

Electric spark ignition apparatus Download PDF

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Publication number
US2748318A
US2748318A US296015A US29601552A US2748318A US 2748318 A US2748318 A US 2748318A US 296015 A US296015 A US 296015A US 29601552 A US29601552 A US 29601552A US 2748318 A US2748318 A US 2748318A
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United States
Prior art keywords
condenser
spark ignition
electric spark
ignition apparatus
principal
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Expired - Lifetime
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US296015A
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Laird John Andrew
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ZF International UK Ltd
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Lucas Industries Ltd
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    • 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

Definitions

  • This invention relates to electric spark ignition apparatus for igniting combustible gas mixtures in prime movers, the apparatus being of the kind comprising a condenser (herein termed the principal condenser), and a control gap and an inductance arranged in series with the condenser, the latter receiving its charge from any convenient source, and the discharge being effected across an igniting plug.
  • a condenser herein termed the principal condenser
  • the object of the invention is to minimise risk of failure of occurrence of the spark at the igniting plug.
  • the invention comprises an apparatus of the kind aforesaid, having an additional condenser connected to the inductance and arranged in parallel with the principal condenser.
  • the invention also comprises a resistance connected in parallel with the additional condenser.
  • Figures land 2 respectively illustrate in diagrammatic form two embodiments of the invention.
  • the already known parts of the apparatus comprise a principal condenser a of the desired capacity.
  • This condenser is intended to be charged intermittently from a magneto, ignition coil or any other convenient source.
  • a control gap b adapted to determine the voltage at which the condenser is discharged.
  • an inductance c is also in series with the control gap, the end of the inductance remote from the control gap being adapted for connection'to the igniting plug d.
  • an additional condenser e is arranged in parallel with the ice condenser a and has one side connected to an intermediate point of the inductance c so that the latter can perform the function of a step-up transformer, as well as its normal function of prolonging the duration of discharge of the first condenser.
  • one electrode of the control gap [1] is connected to an intermediate point of the inductance c, and one side of the additional condenser e is connected to the end of the inductance remote from the igniting plug d.
  • a resistance 1 may be connected in parallel with the additional condenser to avoid the occurrence of a residual charge therein after each discharge.
  • An electric spark ignition apparatus comprising in combination an intermittently chargeable and dischargeable principal condenser, a fixed control gap connected in series with the principal condenser to determine the voltage at which the condenser is dischargeable, a spark gap connected in series with the principal condenser and control gap, the latter being situated between the principal condenser and spark gap, an inductance connected at least in part in series with the principal condenser, control gap and spark gap, and between the control gap and spark gap, for prolonging the duration of discharge of the principal condenser across the spark gap, and an additional condenser connected in parallel with the principal condenser and in series with a part of the inductance remote from the spark gap so that the latter can serve also as a step-up transformer for initiating discharge of the principal condenser across the spark gap.

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

Description

May 29, 1956 J. A. LAHRD 2,748,313
ELECTRIC SPARK IGNITION APPARATUS Filed June 27, 1952 Fig.1
Fig.2
United rates Patent ELECTRIC SPARK IGNITION APPARATUS John Andrew Laird, Coventry, England, assignor to Joseph Lucas (industries) Limited, Birmingham, England Application June 27, 1952, Serial No. 296,015
Claims priority, application Great Britain July 12, 1951 1 Claim. (Cl. 315-180) This invention relates to electric spark ignition apparatus for igniting combustible gas mixtures in prime movers, the apparatus being of the kind comprising a condenser (herein termed the principal condenser), and a control gap and an inductance arranged in series with the condenser, the latter receiving its charge from any convenient source, and the discharge being effected across an igniting plug.
The object of the invention is to minimise risk of failure of occurrence of the spark at the igniting plug.
The invention comprises an apparatus of the kind aforesaid, having an additional condenser connected to the inductance and arranged in parallel with the principal condenser.
The invention also comprises a resistance connected in parallel with the additional condenser.
In the accompanying drawings:
Figures land 2 respectively illustrate in diagrammatic form two embodiments of the invention.
The already known parts of the apparatus comprise a principal condenser a of the desired capacity. This condenser is intended to be charged intermittently from a magneto, ignition coil or any other convenient source. In series with the condenser is arranged a control gap b adapted to determine the voltage at which the condenser is discharged. Also in series with the control gap is arranged an inductance c, the end of the inductance remote from the control gap being adapted for connection'to the igniting plug d.
In the embodiment of the invention shown in Figure 1, an additional condenser e is arranged in parallel with the ice condenser a and has one side connected to an intermediate point of the inductance c so that the latter can perform the function of a step-up transformer, as well as its normal function of prolonging the duration of discharge of the first condenser.
In the embodiment of the invention shown in Figure 2, one electrode of the control gap [1, is connected to an intermediate point of the inductance c, and one side of the additional condenser e is connected to the end of the inductance remote from the igniting plug d.
In either arrangement a resistance 1 may be connected in parallel with the additional condenser to avoid the occurrence of a residual charge therein after each discharge.
By arrangiug an additional condenser in the manner above described, it has been found that risk of failure of the spark discharge at the igniting plug can be minimised or eliminated.
Having thus described my invention What I claim as new and desire to secure by Letters Patent is:
An electric spark ignition apparatus comprising in combination an intermittently chargeable and dischargeable principal condenser, a fixed control gap connected in series with the principal condenser to determine the voltage at which the condenser is dischargeable, a spark gap connected in series with the principal condenser and control gap, the latter being situated between the principal condenser and spark gap, an inductance connected at least in part in series with the principal condenser, control gap and spark gap, and between the control gap and spark gap, for prolonging the duration of discharge of the principal condenser across the spark gap, and an additional condenser connected in parallel with the principal condenser and in series with a part of the inductance remote from the spark gap so that the latter can serve also as a step-up transformer for initiating discharge of the principal condenser across the spark gap.
References Cited in the file of this patent UNITED STATES PATENTS 2,416,971 Welch Mar. 4, 1947 2,489,780 Hooven Nov. 29, 1949 2,551,101 Debenham et al May 1, 1951 2,571,789 Tognola Oct. 16, 1951 2,651,005 Tognola Sept. 1, 1953
US296015A 1951-07-12 1952-06-27 Electric spark ignition apparatus Expired - Lifetime US2748318A (en)

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GB2748318X 1951-07-12

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4540917A (en) * 1983-04-05 1985-09-10 Lutron Electronics Co., Inc. Pulse network for fluorescent lamp dimming

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2416971A (en) * 1947-03-04 Ignition system
US2489780A (en) * 1949-11-29 Timing system for ignition and the
US2551101A (en) * 1948-03-10 1951-05-01 Debenham William Richard Electrical ignition system
US2571789A (en) * 1949-06-09 1951-10-16 Bendix Aviat Corp Electrical apparatus
US2651005A (en) * 1951-09-24 1953-09-01 Bendix Aviat Corp Electrical apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2416971A (en) * 1947-03-04 Ignition system
US2489780A (en) * 1949-11-29 Timing system for ignition and the
US2551101A (en) * 1948-03-10 1951-05-01 Debenham William Richard Electrical ignition system
US2571789A (en) * 1949-06-09 1951-10-16 Bendix Aviat Corp Electrical apparatus
US2651005A (en) * 1951-09-24 1953-09-01 Bendix Aviat Corp Electrical apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4540917A (en) * 1983-04-05 1985-09-10 Lutron Electronics Co., Inc. Pulse network for fluorescent lamp dimming

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