US3824429A - Capacitive discharge ignition system - Google Patents

Capacitive discharge ignition system Download PDF

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Publication number
US3824429A
US3824429A US00264458A US26445872A US3824429A US 3824429 A US3824429 A US 3824429A US 00264458 A US00264458 A US 00264458A US 26445872 A US26445872 A US 26445872A US 3824429 A US3824429 A US 3824429A
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US
United States
Prior art keywords
primary winding
winding
capacitor
auxiliary
series
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Expired - Lifetime
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US00264458A
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English (en)
Inventor
J Davalillo
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.)
Robert Bosch SA
Original Assignee
Fabrica Espanola de Magnetos SA FEMSA
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Expired - Lifetime legal-status Critical Current

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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
    • F02P1/00—Installations having electric ignition energy generated by magneto- or dynamo- electric generators without subsequent storage
    • F02P1/08—Layout of circuits
    • F02P1/086—Layout of circuits for generating sparks by discharging a capacitor into a coil circuit

Definitions

  • the coil also includes an auxiliary primary Juiy 1971 Spain N 393129 winding magnetically connected to the secondary f winding and connected in series with'a diode in oppo- U S R SitiOH t0 Said primary and in parallel to Said [51] 05b 37/02 primary winding and said triggering device.
  • the present invention is concerned with a new procedure for obtaining ignition voltages with a short risetime and a long are duration in capacitive discharge ignition systems.
  • rise-time and duration of the are so that if a system with a short rise-time is projected, it will necessarily have to include, within certain limits and with the techniques known, arc durations which are also short, while if the design is compelled to produce long are durations, the rise-times obtained are great.
  • the advantages of having a short rise-time are known, such as permitting the engine to operate correctly with dirty or greasy spark plugs, which is translated into a longer life for said plugs.
  • the advantages represented by having a long are duration in the spark plugs, such as better and more complete combustion of the mixture, which, in turn, produces'a better engine performance and a reduction of the atmospheric contamination produced by the said engine are also known.
  • Capactive ignition systems are known in which a rectified source changes a capacitor which is in series with the primary winding of a coil and a triggering device like a silicon-controlled diode, the secondary winding of said coil being connected in series with a sparking device. Further, it is known to provide an inductance and a diodein parallel with the primary winding of the coil and in serieswith the triggering device.
  • the purpose of the branch circuit including the extra inductance is to allow continuing current circulation through the primary winding in order to extend the arc duration and the purpose of the inductance per se is to provide an impedance so that some of the back voltage produced by the primary winding charges the capacitor negatively which, in turn, produces a negative current across the silicon-controlled diode, SCR, to turn it off.
  • the Oishi et al., patent also shows as prior art in FIG. 3 a winding and diode connected in parallel to the series lead containing both the primary winding and the SCR. This branch circuit also allows continuing current circulation through the primary winding but is not so effective as the Oishi et al. circuit at turning off the SCR.
  • a short rise-time may be provided by adjusting the relative impedance values of the auxiliary and primary windings and the coil.
  • FIG. 1 is a circuit diagram of a first embodiment of the invention.
  • FIG. 2 is a circuit diagram of a second embodiment of the invention.
  • the first embodiment of the applicants invention includes a source of power such as a generator 1, a system of rectification 2, a charging condenser 3, a trigger unit 4, a silicon-controlled diode 5, having a gate terminal 12, a normal silicon diode 6, acoil 7 with three windings: the principal primary 8, the auxiliary primary 9 and the secondary l0 and spark plug electrodes indicated by reference numeral II.
  • a source of power such as a generator 1, a system of rectification 2, a charging condenser 3, a trigger unit 4, a silicon-controlled diode 5, having a gate terminal 12, a normal silicon diode 6, acoil 7 with three windings: the principal primary 8, the auxiliary primary 9 and the secondary l0 and spark plug electrodes indicated by reference numeral II.
  • the generator or power source 1 supplies alternating current power which is rectified by means of the rectification system 2 to direct current thus charging the condenser 3.
  • the trigger unit 4 generates pulses with the synchronism required with respect to the revolution of the crankshaft of the engine and when a trigger pulse appears at the terminal 12 of the silicon-controlled diode 5, the latter becomes a conductor producing the discharge of the condenser 3 through the principal primary 8 of the coil 7; this discharge, because of the nature of the parameters C and L (C is the capacitance of the condenser 3 and L is the loss inductance of the said principal primary 8) would be of the dampened oscillating type if the circuit had means for the return of current, but this is not possible since the siliconcontrolled diode 5 can conduct in only one direction.
  • FIG. 2 The second embodiment of the circuit as shown in FIG. 2 is similar to the diagram of FIG. 1, except for the inclusion of the recovery diode 13, the remainder of the components continuing to have the same numeration as that indicated for FIG. 1.
  • the functioning-of the circuit is similar to that described for FIG. 1 until the first hemicycle of discharge of the condenser 3 is produced through the principal primary-8 and the silicon-controlled diode from this point onwards, the second hemicycle of the discharge of the condenser 3 takes place through the auxiliary primary winding 9 since the negative hemicycle turns off the SCR 5, but since the recovery diode 13 is in parallel with the said primary winding 9, the current established in the said auxiliary primary winding is damped aperiodically through the said diode 13.
  • the first part of the discharge gives rise to the voltage in said secondary winding with the resultant breakdown across selectrodes 11 and a first short arc
  • the second part of the discharge and the corresponding damping through the recovery diode 13 gives rise to an arc of different polarity and as in the previous case the rise-time and the first partial arc are fixed by the values of the loss inductance of the principal primary winding 8, while the duration of the secondary arc, in this case is fixed by the value of the loss inductance of the auxiliary primary winding 9 and the recovery diode 13.
  • a capacitive ignition circuit comprising a source of rectified power, a capacitor in series with said source which is charged thereby, a coil including a primary winding in series with said capacitor and a secondary winding magnetically coupled to said primary winding and in series with a sparking device and a triggering device in series with said primary winding for alternately connecting and disconnecting said primary winding to said capacitor whereby said capacitor is periodically discharged through said primary winding, the improvement comprising that an auxiliary winding wound in opposition to said primary winding and also magnetically coupled to said secondary winding and a diode properly connected to said auxiliary winding to allow the passage of current therethrough are connected in controlled by the relative impedances of said primary winding and said capacitor, while the arc duration is determined in a first hemicycle of a capacitive discharge cycle by the relative impedances of said primary winding and said capacitor and a second hemicycle of said capacitive discharge cycle by the relative impedances of said auxiliary winding and said capacitor, a dio

Landscapes

  • 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)
US00264458A 1971-07-09 1972-06-20 Capacitive discharge ignition system Expired - Lifetime US3824429A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES393129A ES393129A1 (es) 1971-07-09 1971-07-09 Procedimiento para obtener tensiones de encendido de tiempode elevacion corto con duracion de arco grande en sistemas de encendido de descarga capacitiva.

Publications (1)

Publication Number Publication Date
US3824429A true US3824429A (en) 1974-07-16

Family

ID=8458756

Family Applications (1)

Application Number Title Priority Date Filing Date
US00264458A Expired - Lifetime US3824429A (en) 1971-07-09 1972-06-20 Capacitive discharge ignition system

Country Status (8)

Country Link
US (1) US3824429A (enExample)
AU (1) AU461427B2 (enExample)
CA (1) CA973924A (enExample)
DE (1) DE2233766A1 (enExample)
ES (1) ES393129A1 (enExample)
FR (1) FR2145956A5 (enExample)
GB (1) GB1337699A (enExample)
IT (1) IT962485B (enExample)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4061899A (en) * 1974-10-18 1977-12-06 Messer Griesheim Gmbh Arrangement for stabilization and ignition of welding arcs by ignition pulses
US4247880A (en) * 1978-02-28 1981-01-27 Yamatake-Honeywell Company Limited Ignition device for oil burners
US4739185A (en) * 1986-01-07 1988-04-19 Lucas Industries Public Limited Company Pulse generating circuit for an ignition system
US4782242A (en) * 1985-04-11 1988-11-01 Adam Kovacs Circuit arrangement for generating high voltage pulses
US5446348A (en) * 1994-01-06 1995-08-29 Michalek Engineering Group, Inc. Apparatus for providing ignition to a gas turbine engine and method of short circuit detection
CN109844302A (zh) * 2016-10-19 2019-06-04 沃尔布罗有限责任公司 用于轻型燃烧发动机的控制和通信模块

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3033367C2 (de) * 1980-09-04 1982-12-30 SEAR, System Engineering, Analysis and Research Ltd. & Co KG, 8000 München Schaltkreis zum Steigern von Intensität und Dauer der von einer Zündspule eines Zündsystems für Brennkraftmotoren lieferbaren Zündfunken
DE3822794A1 (de) * 1988-07-06 1990-01-11 Vogler Johannes Dipl Ing Dipl Verteilerlose kondensator-zuendanlagen fuer brennkraftmaschinen

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3655908A (en) * 1970-06-19 1972-04-11 Columbia Broadcasting Syst Inc Apparatus for reproducing color picture information

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3655908A (en) * 1970-06-19 1972-04-11 Columbia Broadcasting Syst Inc Apparatus for reproducing color picture information

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4061899A (en) * 1974-10-18 1977-12-06 Messer Griesheim Gmbh Arrangement for stabilization and ignition of welding arcs by ignition pulses
US4247880A (en) * 1978-02-28 1981-01-27 Yamatake-Honeywell Company Limited Ignition device for oil burners
US4782242A (en) * 1985-04-11 1988-11-01 Adam Kovacs Circuit arrangement for generating high voltage pulses
US4739185A (en) * 1986-01-07 1988-04-19 Lucas Industries Public Limited Company Pulse generating circuit for an ignition system
US5446348A (en) * 1994-01-06 1995-08-29 Michalek Engineering Group, Inc. Apparatus for providing ignition to a gas turbine engine and method of short circuit detection
CN109844302A (zh) * 2016-10-19 2019-06-04 沃尔布罗有限责任公司 用于轻型燃烧发动机的控制和通信模块
US10954911B2 (en) * 2016-10-19 2021-03-23 Walbro Llc Control and communication module for light-duty combustion engine
CN109844302B (zh) * 2016-10-19 2022-05-10 沃尔布罗有限责任公司 用于轻型燃烧发动机的控制和通信模块

Also Published As

Publication number Publication date
DE2233766A1 (de) 1973-01-25
FR2145956A5 (enExample) 1973-02-23
AU461427B2 (en) 1975-05-29
GB1337699A (en) 1973-11-21
IT962485B (it) 1973-12-20
ES393129A1 (es) 1973-09-16
CA973924A (en) 1975-09-02
AU4435872A (en) 1974-01-10

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