US3832986A - Capacitor discharge ignition system including spark duration extender means - Google Patents

Capacitor discharge ignition system including spark duration extender means Download PDF

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Publication number
US3832986A
US3832986A US00315267A US31526772A US3832986A US 3832986 A US3832986 A US 3832986A US 00315267 A US00315267 A US 00315267A US 31526772 A US31526772 A US 31526772A US 3832986 A US3832986 A US 3832986A
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US
United States
Prior art keywords
capacitor
discharge
charging
auxiliary
ignition
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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
US00315267A
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English (en)
Inventor
P Dogadko
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Motorola Solutions Inc
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Motorola Inc
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Filing date
Publication date
Application filed by Motorola Inc filed Critical Motorola Inc
Priority to US00315267A priority Critical patent/US3832986A/en
Priority to GB4555373A priority patent/GB1392688A/en
Priority to IT52934/73A priority patent/IT994370B/it
Priority to JP48137261A priority patent/JPS4987929A/ja
Priority to FR7344240A priority patent/FR2211051A5/fr
Priority to DE2362024A priority patent/DE2362024A1/de
Application granted granted Critical
Publication of US3832986A publication Critical patent/US3832986A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02P3/0876—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

Definitions

  • a capacitive discharge ignition system for providing an extended ignition coil output voltage duration includes main and auxilia stora e ca acitors cong g 123/148 g xg nected to an ignition coilf
  • the triggering 3,127,540 3/1964 Collins 123/148 0CD of the second SCR discharges the auxiliary capacity 3,202,874 8/1965 Bfil'dOCZ 123/148 0CD into the ignition coiL
  • the uccessive discharging of sBtone the main and auxiliary capacitors provides the inarnes...
  • the highly desirable capacitive discharge ignition system was put aside in favor of other solid state systems, some of which use bulky ballast resistors, may require a heavy battery chain and which have high speed limitations.
  • One of the reasons for the decision to use these other systems rather than the capacitive discharge ignition system is the ability in the first-mentioned systems to obtain a spark of longer duration with a conventional ignition coil than could be provided by the capacitive discharge ignition system.
  • the spark duration provided by these systems is roughly 1.2 milliseconds, while with a conventional capacitive discharge ignition system the spark duration is on the order of 0.4 milliseconds.
  • spark plugs of the engine in which the system is used have a longer life,'but it is more difficult to start the engine in colder weather and timing becomes more critical.
  • the spark duration in a capacitive discharge ignition system could be increased from 0.4 milliseconds to within a range of 0.75 to 0.9 milliseconds to overcome the short spark duration problems, the capacitive discharge ignition system would out perform the conventional transistorized system in so far as being more efficient, providing a more constant voltage output, having a higher speed capability and providing longer spark plug life, and yet overcome the starting and timing problems associated therewith.
  • lt is still another object of the present invention to provide a new and improved capacitive discharge ignition system of the above described type which has all of the attributes of a conventional capacitive discharge ignition system and which avoids substantially the limitations of such a system as described heretofore.
  • a preferred embodiment of a capacitive discharge'ignition system includes a storage capacitor which is initially charged.
  • An auxiliary capacitor in a spark duration extending or lengthening circuit is also charged with the main stor- 2 age capacitor.
  • a triggering pulse provided by points or a magnetic breakerless arrangement operates a first silicon controlled rectifier to discharge the main capacitor into the ignition coil.
  • the discharge provides a transistor of a blocking oscillator employed initially to charge the capacitors, with base bias.
  • the emitter voltage of the lastmentioned transistor thereby provides a signal to operate a timer circuit in the spark duration lengthening circuit.
  • the timer circuit after a 0.4 millisecond delay, triggers a second silicon controlled rectifier in the auxiliary circuit, to in turn, dis charge the auxiliary capacitor into the ignition coil.
  • the additional energy from the auxiliary capacitor subsequent to the 0.4 millisecond delay provides an in crease in spark duration of approximately 0.350 milliseconds, depending on the size of the auxiliary capacitor and the timer circuit.
  • the ignition system includes a capacitive discharge ignition circuit portion and spark duration extender circuit portion, each of which is outlined in dashed lines.
  • the capacitive discharge ignition circuit portion of the ignition system comprises an oscillator circuit, including a transistor 18 having base, emitter and collector electrodes 20, 22, 24, respectively.
  • the base electrode 20 is connected through a bias resistor 26 to junction 28 whereat a capacitor 30 and parallel diode resistor combination 32 are connected.
  • the lastmentioned combination is also connected to the secondary 34 of a transformer 36; the primary 38 of the transformer being connected to the emitter 22 of the transistor 18.
  • the collector 24 of transistor 18 is connected via lead 40 through a reverse polarity protecting diode 42 and an ignition switch 44 to the vehicle battery (not shown).
  • Capacitor 30 is also connected over lead 46 to the emitter 48 of a second transistor 50 of the capacitive discharge circuit portion 12.
  • a resistor 47 is connected between the emitter 48 of transistor 50 and lead 40, and a capacitor 49 is coupled between lead 40 and ground potential.
  • the transistor 50 includes base and collector electrodes ,52, 54, respectively, the latter of which is connected to ground potential.
  • the base electrode 52 of transistor 50 is connected through a transient protecting diode 56 and resistor 58 to circuitry in cluding the system storage capacitor 60.
  • the last-mentioned circuitry includes a transformer winding 62 coupled inductively to the transformer 36. Connected in series with the winding 62 is a silicon controlled rectifier switch 64, the primary 66 of ignition coil 68 of the system and diodes 70, 72. Capacitor is connected across the output winding 62 along with a free wheeling diode 74 which permits continued current flow in the ignition coil subsequent to. the discharge of the capacitor 60, and a transient protecting device 76. The secondary 78 of the ignition coil is coupled to a distributor (not shown).
  • the controlled rectifier switch 64 includes a control electrode 80 which is connected through a transformer 82 to the breaker points or magnetic pickup (not shown) of the system which provides a trigger pulse to operate the silicon controlled rectifier to an on conditron.
  • the last-mentioned circuit portion includes an auxiliary storage capacitor 84 connected at one terminal at junction 86 to the main storage capacitor 60, and at the other terminal at junction 88 whereat the cathode of a diode 90 and anode of a second silicon controlled rectifier switch 92 is also connected.
  • the anode of the diode 90 is coupled over lead 94 to one side of winding 62 and the cathode of the silicon controlled rectifier 92 is coupled at junction 96 to the cathode of silicon controlled rectifier 64.
  • Gate electrode 98 of the silicon controlled rectifier 92 is coupled through a transformer to a programmable unijunction transistor (PUT) 102 forming a portion of a timing circuit, including also, capacitor 106 connected between ground potential and junction 108 whereat the anode of the PUT and a resistor 110 are also connected.
  • the control electrode 112 of the PUT 102 is coupled through a voltage divider network including resistors 114, 116, and a diode 118 and over lead 120 to one side of the primary winding 34 of transformer 36 of the blocking oscillator 16.
  • the ignition switch 44 is closed initially to provide power from the storage battery to the capacitive discharge ignition system for initiating operation thereof.
  • a high voltage spike produced normally by the closing of the ignition switch 44 is usually sufficient to bias transistor 18 to the on condition to begin the ignition cycle.
  • transistor 50 insures the initiation of the cycle.
  • the emitter 48 of transistor 50 is at the potential of the vehicle storage battery and capacitor 30 is once again charged through resistor 47. Current flowing through the capacitor 30 provides base bias to transistor 18 of oscillator circuit 16 thereby to turn the transistor on.
  • transistor 18 is turned on, either by the initial high voltage spike from the closing of ignition switch 44 or through the operation of transistor 50 as described heretofore, the ignition cycle has been initiated.
  • Transistor l8 stays on so long as capacitor 30 is charging. Upon capacitor 30 being fully charged, the
  • transistor base 20 of transistor 18 bias on transistor base 20 of transistor 18 is removed to turn the last-mentioned transistor off.
  • current was flowing through emitter 22 and the winding 38 to ground.
  • a high voltage appears at the winding 38 and is inductively coupled to winding 62 to produce a current flow therethrough for charging the main storage capacitor via diode 72, and auxiliary capacitor 84 of the spark duration extender circuit portion through diodes and 72 with the polarities as shown in the drawing.
  • capacitor 60 During the discharge of capacitor 60, the variation in current through winding 62 induces a voltage back into coil 38 of transformer 36 which is passed to the primary winding 34 and to base 20 of the transistor 18, to turn the last-mentioned transistor on.
  • the operation of transistor 18 provides a voltage across winding 34 to produce a current on lead 120 for operating the timer circuit of the spark duration extender circuit portion.
  • Capacitor 106 of the timer circuit is charged until the voltage at junction 108 is greater than the divided down voltage at the gate electrode 112 of PUT 102, thereby rendering the lastmentioned component conductive.
  • the delay in operating PUT 102 is on the order of 0.4 milliseconds, sufficient to permit capacitor 60 to be discharged.
  • transistor 18 is rendered non-conductive. The time it takes transistor 18 to return to an off or non-conductive state is sufficiently longer than the time it takes to turn PUT 102 on.
  • a trigger signal is provided by the discharge of capacitor 106 therethrough, through transformer to gate electrode 98 of SCR 92 to turn the last-mentioned component on.
  • Turning on SCR 92 completes a circuit including auxiliary capacitor 84, SCR 92, the primary 66 of ignition coil 68 and diode 70, to discharge the auxiliary capacitor into the ignition coil.
  • the discharging of capacitor 84 thereby extends the spark duration initiated by the discharge of capacitor 60.
  • the spark duration is increased by approximately 0.350'milliseconds.
  • SCR 92 is rendered non-conductive. Upon the turning off of transistor 18, a high voltage is induced from winding 38 of transformer 36 into winding 62 to once again charge capacitors 60 and 84 and to repeat the cycle.
  • the circuit according to the invention provides a capacitive discharge ignition system which has the attributes of a conventional capacitive discharge ignition circuit, as well as a sufficiently long-spark duration to provide better engine starting in cold weather and to lessen the criticality of timing of the engine with which the capacitive discharge ignition system is used.
  • a capacitive discharge ignition system for use with an internal combustion engine, including a main storage capacitor, an ignition coil coupled electrically to said storage capacitor for providing ignition output voltage for operating the engine, means coupled electrically to said storage capacitor for charging said capacitor, means for producing trigger pulses in accordance with the operation of the engine and controlled switch means coupled electrically to said pulse trigger means and said storage capacitor for operation in accordance with the receipt of a pulse from said trigger means to discharge said storage capacitor into said ignition coil, spark duration extending circuit means including in combination: an auxiliary capacitor coupled electrically to said ignition coil and to said charging means and being charged by said last-mentioned means, a second controlled switch means connected electrically to said auxiliary capacitor for discharging the last-mentioned capacitor in accordance with the operation of said second controlled switch means, oscillator circuit means inductive means coupling said oscillator circuit means to said main and auxiliary capacitors and timer circuit means coupled electrically to said oscillator circuit means and to said second controlled switch means, said oscillator circuit means being operated in response to the receipt of
  • a capacitive discharge ignition system as claimed in claim 1 further including ignition switch means operable between actuated and unactuated positions, and
  • a capacitive discharge ignition system as claimed in claim 3 wherein said timer circuit means is coupled electrically to said transformer means and wherein upon discharge of said main storage capacitor, a voltage is induced in said transformer means to operate said solid state switch means to provide current to said timer circuit means for operation thereof.
  • a capacitive discharge ignition system for use with an internal combustion engine, including in combination; a main storage capacitor, an auxiliary storage capacitor, an ignition coil coupled electrically to said main and auxiliary capacitors for providing a high voltcoupled electrically to said main and auxiliary capacitors, said charging means being operable to charge said capacitors, trigger pulse means operable to provide periodic trigger pulses in accordance with the operation of said engine, first switch means connected to said main storage capacitor and to said trigger pulse means and operable in response to the receipt of a pulse from said trigger pulse means to discharge said main storage capacitor into said ignition coil, second switch means connected to said auxiliary capacitor and to said ignition coil, and timer circuit means coupled electrically to said system and to said second switch means, said timer circuit means being operable in response to the discharge of said main storage capacitor to operate said second switch means for discharging said auxiliary capacitor into said ignition coil, said timer circuit means having a delay period for delaying the operation of said second switch means for a predetermined time whereby said auxiliary capacitor is discharged in succession with said main storage capacitor to

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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)
US00315267A 1972-12-14 1972-12-14 Capacitor discharge ignition system including spark duration extender means Expired - Lifetime US3832986A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US00315267A US3832986A (en) 1972-12-14 1972-12-14 Capacitor discharge ignition system including spark duration extender means
GB4555373A GB1392688A (en) 1972-12-14 1973-09-28 Capacitor discharge ignition system for use with an internal combustion engine
IT52934/73A IT994370B (it) 1972-12-14 1973-10-04 Perfezionamento nei sistemi di accensione elettronica per autoveicoli
JP48137261A JPS4987929A (it) 1972-12-14 1973-12-08
FR7344240A FR2211051A5 (it) 1972-12-14 1973-12-11
DE2362024A DE2362024A1 (de) 1972-12-14 1973-12-13 Kondensatorzuendsystem mit einer zuendfunkendauer-verlaengerungsschaltung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00315267A US3832986A (en) 1972-12-14 1972-12-14 Capacitor discharge ignition system including spark duration extender means

Publications (1)

Publication Number Publication Date
US3832986A true US3832986A (en) 1974-09-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00315267A Expired - Lifetime US3832986A (en) 1972-12-14 1972-12-14 Capacitor discharge ignition system including spark duration extender means

Country Status (6)

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US (1) US3832986A (it)
JP (1) JPS4987929A (it)
DE (1) DE2362024A1 (it)
FR (1) FR2211051A5 (it)
GB (1) GB1392688A (it)
IT (1) IT994370B (it)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3923030A (en) * 1974-09-19 1975-12-02 Frank Kenneth Luteran Phase sensitive ignition timing system
US4000724A (en) * 1973-07-14 1977-01-04 Hughes Microelectronics Limited Ignition arrangements for internal combustion engines
US4015576A (en) * 1974-04-22 1977-04-05 Junak Edward M Ignition system
FR2404120A1 (fr) * 1977-09-22 1979-04-20 Bosch Gmbh Robert Installation d'allumage pour moteurs a combustion interne
US4457285A (en) * 1981-11-24 1984-07-03 Nissan Motor Company, Ltd. Sustained arc ignition system for an internal combustion engine
US5060623A (en) * 1990-12-20 1991-10-29 Caterpillar Inc. Spark duration control for a capacitor discharge ignition system
EP0491589A1 (fr) * 1990-12-19 1992-06-24 Labo Industrie Générateur d'allumage haute énergie notamment pour turbine à gaz
US20160134085A1 (en) * 2014-11-11 2016-05-12 Rohm Co., Ltd. Igniter and vehicle, and method for controlling ignition coil
WO2016175733A1 (en) * 2015-04-25 2016-11-03 Lamar William Paul High speed capacitor discharge ignition system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006040982A1 (de) * 2006-08-31 2008-03-20 Michael Reimann Ein-Energiespeicher-Hochstrom-Zündung

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3127540A (en) * 1961-01-31 1964-03-31 Rotax Ltd Spark ignition apparatus
US3202874A (en) * 1961-06-28 1965-08-24 Bardocz Arpad Spectroscopic low voltage spark source and interrupted arc source
US3376470A (en) * 1965-08-12 1968-04-02 Atomic Energy Commission Usa Capacitor discharge circuit for starting and sustaining a welding arc
US3595212A (en) * 1968-02-19 1971-07-27 Rolls Royce Sparking circuit for an ignition system for internal combustion engines
US3635202A (en) * 1969-06-20 1972-01-18 Bosch Gmbh Robert Ignition arrangements for internal combustion engines
US3669086A (en) * 1970-09-30 1972-06-13 Motorola Inc Solid state ignition system
US3728991A (en) * 1970-10-06 1973-04-24 Fiat Spa Capacitive discharge ignition circuit

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3127540A (en) * 1961-01-31 1964-03-31 Rotax Ltd Spark ignition apparatus
US3202874A (en) * 1961-06-28 1965-08-24 Bardocz Arpad Spectroscopic low voltage spark source and interrupted arc source
US3376470A (en) * 1965-08-12 1968-04-02 Atomic Energy Commission Usa Capacitor discharge circuit for starting and sustaining a welding arc
US3595212A (en) * 1968-02-19 1971-07-27 Rolls Royce Sparking circuit for an ignition system for internal combustion engines
US3635202A (en) * 1969-06-20 1972-01-18 Bosch Gmbh Robert Ignition arrangements for internal combustion engines
US3669086A (en) * 1970-09-30 1972-06-13 Motorola Inc Solid state ignition system
US3728991A (en) * 1970-10-06 1973-04-24 Fiat Spa Capacitive discharge ignition circuit

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4000724A (en) * 1973-07-14 1977-01-04 Hughes Microelectronics Limited Ignition arrangements for internal combustion engines
US4015576A (en) * 1974-04-22 1977-04-05 Junak Edward M Ignition system
US3923030A (en) * 1974-09-19 1975-12-02 Frank Kenneth Luteran Phase sensitive ignition timing system
FR2404120A1 (fr) * 1977-09-22 1979-04-20 Bosch Gmbh Robert Installation d'allumage pour moteurs a combustion interne
US4457285A (en) * 1981-11-24 1984-07-03 Nissan Motor Company, Ltd. Sustained arc ignition system for an internal combustion engine
EP0491589A1 (fr) * 1990-12-19 1992-06-24 Labo Industrie Générateur d'allumage haute énergie notamment pour turbine à gaz
FR2670829A1 (fr) * 1990-12-19 1992-06-26 Labo Ind Generateur d'allumage haute energie notamment pour turbine a gaz.
US5224015A (en) * 1990-12-19 1993-06-29 Labo Industrie High energy ignition generator in particular for a gas turbine
US5060623A (en) * 1990-12-20 1991-10-29 Caterpillar Inc. Spark duration control for a capacitor discharge ignition system
US20160134085A1 (en) * 2014-11-11 2016-05-12 Rohm Co., Ltd. Igniter and vehicle, and method for controlling ignition coil
US9800024B2 (en) * 2014-11-11 2017-10-24 Rohm Co., Ltd. Igniter and vehicle, and method for controlling ignition coil
WO2016175733A1 (en) * 2015-04-25 2016-11-03 Lamar William Paul High speed capacitor discharge ignition system

Also Published As

Publication number Publication date
GB1392688A (en) 1975-04-30
JPS4987929A (it) 1974-08-22
IT994370B (it) 1975-10-20
FR2211051A5 (it) 1974-07-12
DE2362024A1 (de) 1974-06-20

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