US3749973A - Continuous wave high frequency ignition system - Google Patents

Continuous wave high frequency ignition system Download PDF

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Publication number
US3749973A
US3749973A US00100642A US3749973DA US3749973A US 3749973 A US3749973 A US 3749973A US 00100642 A US00100642 A US 00100642A US 3749973D A US3749973D A US 3749973DA US 3749973 A US3749973 A US 3749973A
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United States
Prior art keywords
oscillator
points
breaker points
circuit
capacitor
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Expired - Lifetime
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US00100642A
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English (en)
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R Canup
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Texaco Inc
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Texaco Inc
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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
    • F02P3/01—Electric spark ignition installations without subsequent energy storage, i.e. energy supplied by an electrical oscillator

Definitions

  • the invention is applicable to a continuous wave high frequency igniton system having breaker points and a unitary magnetic circuit type of oscillator. It concerns the improvement which comprises starting means for said oscillator.
  • starting means comprises means associated with said breaker points for applying a magnetic bias to said magnetic circuit when said breaker points are in one position, and removing said bias when said breaker points go to the other position.
  • It also comprises means for absorbing the initial surge effects at said breaker points when said bias is removed, whereby said oscillator circuit will start and continue oscillating while said breaker points are in said other position.
  • the invention relates to a continuous wave high frequency ignition system which includes breaker points and which employs a single core transformer with a pair of transistors connected in an oscillator circuit.
  • the oscillator circuit has a battery for its DC supply and the invention concerns the improvemement which comprises a control winding on said transformer. It also comprises circuit means including said breaker points in series with said control winding and having a potenio-meter connected across said battery for supplying a small DC current in said control winding in order to apply a magnetic bias to said core when said breaker points are closed.
  • it comprises a small capacitor connected across said breaker points to absorb preliminary surge when the points begin to open, and a diode bridge having two pairs of diagonals one for input AC current flow and one for rectified DC output. It also comprises circuit means for connecting said input diagonal pair across said breaker points, in parallel with said small capacitor. And it comprises a larger capacitor with a discharge resistor being connected thereacross, and circuit means for connecting said larger capacitor and resistor to said output diagonal pair.
  • the invention concerns a continuous wave high frequency igntiion system that has breaker points and that employs a unitary magnetic circuit type oscillator including a battery. for DC supply and having an output winding to supply sparking potential, as well as having a control winding.
  • the invention comprises the combination of (1) circuit means comprising a potentiometer connected across said battery and connecting said breaker points in series with said control winding for applying a DC magnetic bias to said oscillator core when the points are closed. Also, it comprises (2) low impedance current flow path for induced currents in said control winding when said points are closed, in order to stop said oscillator.
  • It also comprises (3) a large capacitor and circuit means for connecting it close to the common connector for the primary windings of said oscillator, and (4) a small capacitor connected across said breaker points for absorbing initial surge potnetial as said points commence opening. It also comprises (5) a diode bridge having two pairs of diagonals, and (6) an intermediate capacitor having a resistor connected thereacross for discharging the same. In addition, it comprises (7) circuit means for connecting said diode bridge with one pair of said diagonals across said breaker points for AC current flow, and (8) circuit means for connecting said intermediate capacitor across said other pair of diagonals to receive rectified DC charging current for absorbing secondary surge potential as said points continue opening until the points are open far enough to prevent arcing.
  • FIG. 1 is a schematic circuit diagram illustrating a typical igniton system according to the invention.
  • FIG. 2 is a schematic diagram showing a transformer core with windings thereon corresponding to the windings of FIG. 1 and including an air gap in the core.
  • the circuit diagram illustrated shows a unitary magnetic circuit type of oscillator 11 that basically resembles the type of oscillator known as a Uchrin-Royer circuit.
  • Such an oscillator operates in a known manner (as will be described in greated detail below) to supply a continuouswave high frequency signal in an output winding 12, that is located on a transformer 13.
  • the power supply for the oscillator is a DC battery 16 that is connected to ground at one terminal by a circuit wire 17, as illustrated.
  • the other side of the battery is connected via a wire 18, and an ignition switch 19 to a circuit wire 20.
  • Wire 20 is connected to another circuit wire 24 that leads to a wire 25 which connects into the center tap on a primary winding 26 located on the transformer 13.
  • the power necessary for driving the oscillator 11 is supplied to the emitters of a pair of transistors 30 and 31. These have the collectors thereofjoined together in a common circuit and it is connected to a ground via a circuit wire 32.
  • oscillator 11 As indicated above, the operation of oscillator 11 is well known. It consists of an alternate switching of a state of full conduction from one to the other of the transistors 30 and 31. This takes place by reason of the action involving a pair of base drive windings 35 and 36. These windings are connected from the emitter to the base of transistors 31 and 30 respectively, via the indicated circuit wires which include resistors 37 and 38.
  • the system according to this invention employs a control winding 45 that is magnetically coupled to the core of transformer 13 and that is connected to a potentiometer made up of resistors 46 and 47 which are connected in series across the output of the battery 16. It will be noted that one side of winding 45 is connected via a circuit wire 50 to the junction between the resistors 46 and 47. The other side of the winding 45 is connected via a circuit wire 51 to one side of a breaker points" switch 52. The other side of switch 52 is connected to ground via a circuit wire 53, as illustrated.
  • diode bridge 57 that is connected with one pair of its diagonals across the breaker points 52, in parallel with the capacitor 56.
  • circuit wire 60 connected to one diagonal point of the diode bridge 57 and to the circuit wire 51.
  • circuit wire 61 that connects the opposite diagonal point of the bridge 57 to ground, as illustrated.
  • the diodes in bridge 57 are connected with the polarities arranged so as to provide a rectified DC output at the diagonal points opposite the pair of diagonals that are connected to circuit wires 60 and 61.
  • circuit wire 64 connected to one of these opposite diagonal points and another circuit wire 65 connected to the other of this pair of diagonals.
  • These circuit wires 64 and 65 connect to the ends of an intermediate sized capacitor 66 which has a resistor 67 connected thereacross in order to provide a discharge path for the capacitor.
  • this intennediate capacitor 66 along with the diode bridge 57 act to absorb the surge voltage after the small capacitor 56 has been charged.
  • An additional feature of this invention concerns that of providing a large capacity capacitor 70 which is connected as close as feasible to the circuit wire where it connects to the center tap on the winding 26.
  • capacitor 70 in the circuit diagram has one side connected to the junction between circuit wires 24 and 25 while the other side thereof is connected to ground, as illustrated.
  • This has two functions, one of which is to limit switching spikes on the primary wave form in the transistor circuits. The other function is to reduce feedback to the battery 16. Such feedback would tend to cause interference with radio equipment operated from the same battery.
  • the oscillator When the breaker points 52 are closed, following a period of sparking oscillations, the oscillator will stop oscillating. This is because there is a low impedance path for current flow that is caused by voltages induced in the winding 45. The current which flows in this path will load down the oscillator to the point where oscillation ceases which, of course, stops the ignition spark output.
  • the low impedance path across the ends of the wind ing 45 may be traced from ground at one side of the closed breaker points switch 52, over the wire 51 to one side of the winding. Then from the other side of the winding 45 the path is over wire 50 and through resistor 47 back to ground.
  • resistor 47 might be replaced by a pair of diodes (not shown) to connect circuit wire 50 to ground. These would be oppositely poled so as to provide low impedance paths for both dircctions of flow of AC signal, as generated in the winding 45.
  • resistor 47 even though it will dissipate more power, by drawing potentiometer current, than would be the case if the foregoing diodes (not shown) were employed.
  • An important aspect of the invention is that involving the starting network which was described above. It includes the diode bridge 57 and the small capacitor 56 which are both connected across the breaker points 52. In operation, the action of this starting network may be described by tracing conditions which are emphasized during a slow speed operation of an internal combustion engine to which this ignition system may be applied.
  • the foregoing action may include surges in either direction of AC potentials since the bridge 57 is arranged for rectified DC output across the capacitor 66.
  • the intermediate surging effects will be drained off by charging capacitor 66 during the time that the breaker points 52 are continuing to open and until they have opened sufficiently to prevent arcing thereacross.
  • the loading down of the oscillator circuit is prevented after the initial starting of the oscillator when the capacitor 66 is charged. Then, upon opening of the breaker points 52 the oscillator will not be loaded and the oscillator will thereafter continue to run and provide sparking output signals from the winding 12, until the breaker points 52 have been closed once more.
  • An additional function of the starting network 57, 66 and 67 is that of absorbing oscillator switching transients in the control winding 45 circuit. Such switching transients occur as one transistor turns on and the other turns off, and this is the time when the capacitor 66 is being recharged to its peak voltage after the previous half cycle's discharge through resistor 67. Consequently the transient is absorbed by the recharging current flow. This helps to prevent these switching transients from reaching voltage magnitudes that would be sufficient to cause breakdown of the collector to emitter junction of the transistors.
  • Transistors 30 and 31 type manufactured by Solitron Devices Inc., Part. No. SDT-l809.
  • Resistors 37 and 38 1.0 ohms each.
  • Resistor 46 30 ohms.
  • Capacitor 56 .01 uf at 2,000 volts.
  • Capacitor 66 0.15 uf at 400 volts.
  • Diode bridge 57 bridge rectifier manufactured by Mallory, FW-600 MAL 935.
  • Battery 16 a 12-volt DC battery.
  • circuit means including said breaker points for applying DC bias to said control winding when said breaker points are in one position and removing said bias when said breaker points go to the other position, and
  • said absorbing means (2) comprises c. a small capacitor across said breaker points
  • diode means coupled to a larger capacitor connected across said breaker points.
  • diode means (d) comprises d]. a diode bridge having two pairs of diagonal points, and
  • circuit means for connecting one pair of diagonal points across said breaker points and for connecting the other pair of diagonal points across said larger capacitor.
  • a continuous wave high frequency ignition system including breaker points and employing a single core transformer having a pair of transistors connected in an oscillator circuit, said circuit having a battery for DC supply, the improvement comprising a control winding on said transformer,
  • circuit means including said breaker points in series with said control winding and having a potentiometer connected across said battery for supplying a small DC current in said control winding in order to apply a magnetic bias to said core when said breaker points are closed,
  • diode bridge having two pairs of diagonals one for input AC current flow and one for rectified DC output
  • circuit means for connecting said input diagonal pair across said breaker points in parallel with said small capacitor
  • circuit means for connecting said larger capacitor and resistor to said output diagonal pair.
  • a continuous wave high frequency ignition system having breaker points and a control winding and employing a unitary magnetic circuit type of oscillator, including primary windings and a secondary winding for delivering sparking output signals, comprising in combination means for applying a DC potential to said control winding when said breaker points are in one position and for removing said DC potential when the breaker points are in the other position, and
  • a continuous wave high frequency ignition system according to claim 6, further comprising capacitor means closely connected to the primary windings of said oscillator for absorbing switching peaks during oscillation.
  • a continuous wave high frequency ignition system according to claim 7, further comprising means for absorbing initial surge potential at said breaker points when moving toward said other position without loading said control winding enough to prevent starting of said oscillator.
  • a continuous wave high frequency ignition system according to claim 6 wherein said system also has an output winding to supply sparking potential, further comprising means for determining the frequency of said oscillator in dependence upon leakage inductance in said magnetic circuit whereby the load on said output winding may be controlled by a change in the frequency.
  • a continuous wave high frequency ignition system according to claim 9, further comprising capacitor means closely connected to the primary windings of said oscillator for absorbing switching peaks during oscillation.
  • a continuous wave high frequency ignition system further comprising means for absorbing initial surge potential at said breaker points when moving toward said other position without loading said control winding enough to prevent starting of said oscillator.
  • a continuous wave high frequency ignition system according to claim 11, wherein said absorbing means comprises a small capacitance capacitor connected across said breaker points, and
  • a continuous wave high frequency ingition system having breaker points and employing a unitary magnetic circuit type oscillator including a battery for DC supply and having an output winding to supply sparking potential, and a control winding, comprising in combination 1.
  • circuit means comprising a potentiometer connected across said battery and connecting said breaker points in series with said control winding for applying a DC magnetic bias to said oscillator core when the points are closed,
  • low impedance means comprising a portion of said potentiometer and providing a low impedance current flow path for induced currents in said control winding when said points are closed in order to stop said oscillator
  • circuit means for connecting said intermediate capacitor across said other pair of diagonals to receive rectified DC charging current for absorbing secondary surge potential as said points continue opening until the points are open far enough to prevent arcing.
  • circuit means including said current flow control means for applying DC to said control winding
  • initial surge absorbing means comprising c. a small capacitor across said current flow control means, and d. diode means coupled to a larger capacitor connected across said current flow control means, said diode means comprising dl. a diode bridge having two pairs of diagonal points, and d2. circuit means for connecting one pair of diagonal points across said current flow control means and for connecting the other pair of diagonal points across said larger capacitor.
  • a continuous wave high frequency ignition system including engine timed current flow control means and employing a single core transformer having a pair of transistors connected in an oscillator circuit, said circuit having a battery for DC supply, the improvement comprising 7 a control winding on said transformer,
  • circuit means including said current flow control means in series with said control winding and having a potentiometer connected across said battery for supplying a small DC current in said control winding in order to apply a magnetic bias to said core when said current flow control means is passing current,
  • diode bridge having two pairs of diagonals, one for input AC current flow and one for rectified DC output,
  • circuit means for connecting said input diagonal pair across siad current flow control means in parallel with said small capacitor
  • circuit means for connecting said larger capacitor and resistor to said output diagonal pair.

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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)
  • Inverter Devices (AREA)
  • Keying Circuit Devices (AREA)
US00100642A 1970-12-22 1970-12-22 Continuous wave high frequency ignition system Expired - Lifetime US3749973A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US10064270A 1970-12-22 1970-12-22

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US3749973A true US3749973A (en) 1973-07-31

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US00100642A Expired - Lifetime US3749973A (en) 1970-12-22 1970-12-22 Continuous wave high frequency ignition system

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US (1) US3749973A (enrdf_load_stackoverflow)
JP (1) JPS5345453B1 (enrdf_load_stackoverflow)
BR (1) BR7108193D0 (enrdf_load_stackoverflow)
CA (1) CA951786A (enrdf_load_stackoverflow)
CH (1) CH532716A (enrdf_load_stackoverflow)
DE (1) DE2158138B2 (enrdf_load_stackoverflow)
ES (1) ES397189A1 (enrdf_load_stackoverflow)
FR (1) FR2119512A5 (enrdf_load_stackoverflow)
GB (1) GB1323949A (enrdf_load_stackoverflow)
IT (1) IT944197B (enrdf_load_stackoverflow)
NL (1) NL159476B (enrdf_load_stackoverflow)
SE (1) SE383018B (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3910246A (en) * 1973-08-10 1975-10-07 Texaco Inc Continuous-wave high-frequency AC ignition system
US3945362A (en) * 1973-09-17 1976-03-23 General Motors Corporation Internal combustion engine ignition system
US4061899A (en) * 1974-10-18 1977-12-06 Messer Griesheim Gmbh Arrangement for stabilization and ignition of welding arcs by ignition pulses
US4567874A (en) * 1980-02-21 1986-02-04 Siemens Aktiengesellschaft Ignition system for internal combustion engines
US4733646A (en) * 1986-04-30 1988-03-29 Aisin Seiki Kabushiki Kaisha Automotive ignition systems
US6112730A (en) * 1999-02-26 2000-09-05 Thomas C. Marrs Ignition system with clamping circuit for use in an internal combustion engine
US6135099A (en) * 1999-02-26 2000-10-24 Thomas C. Marrs Ignition system for an internal combustion engine
US20210383965A1 (en) * 2018-12-07 2021-12-09 Mitsubishi Electric Corporation Ignition system

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5620769A (en) * 1979-07-30 1981-02-26 Nippon Soken Inc Igniter
JPS5632074A (en) * 1979-08-24 1981-04-01 Nippon Soken Inc Ignition system
JPS5634964A (en) * 1979-08-31 1981-04-07 Nippon Soken Inc Ignition device
US4446842A (en) * 1981-06-01 1984-05-08 Aisin Seiki Kabushiki Kaisha Ignition system
US4382430A (en) * 1981-06-01 1983-05-10 Shinichiro Iwasaki Ignition system

Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2976461A (en) * 1959-02-06 1961-03-21 Globe Union Inc Oscillator ignition system
US2981865A (en) * 1959-06-08 1961-04-25 Transitronics Ltd Transistorized oscillatory system
US3018413A (en) * 1960-01-21 1962-01-23 Shurhit Products Inc Transistorized ignition system
US3035180A (en) * 1960-02-03 1962-05-15 Wilfrid O White & Sons Inc Compass
US3035108A (en) * 1959-04-09 1962-05-15 Economy Engine Co Oscillator circuit
US3140423A (en) * 1961-02-06 1964-07-07 Lucas Industries Ltd Spark ignition apparatus for internal combustion engine
US3175123A (en) * 1960-12-08 1965-03-23 Globe Union Inc Oscillator ignition system
US3251351A (en) * 1963-10-14 1966-05-17 Shell Oil Co Electronic ignition system
US3264519A (en) * 1963-12-30 1966-08-02 Ford Motor Co Arc suppression means
US3309568A (en) * 1964-01-02 1967-03-14 Ford Motor Co Means including a saturable capacitor for reducing electrical energy dissipation in an electrical switching element
US3312210A (en) * 1964-10-12 1967-04-04 Ford Motor Co Ignition system
US3327164A (en) * 1964-01-18 1967-06-20 Bosch Gmbh Robert High-voltage ignition system for internal combustion engines
US3373314A (en) * 1965-06-25 1968-03-12 Ford Motor Co Transistorized ignition system with a saturable transformer control and voltage compensation means
US3407795A (en) * 1966-06-02 1968-10-29 Texaco Inc Ignition system for internal combustion engines
US3476098A (en) * 1968-05-23 1969-11-04 Peter Cook Ignition system
US3504231A (en) * 1967-06-26 1970-03-31 Andrews Mfg Co Breakerless oscillator ignition system

Patent Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2976461A (en) * 1959-02-06 1961-03-21 Globe Union Inc Oscillator ignition system
US3035108A (en) * 1959-04-09 1962-05-15 Economy Engine Co Oscillator circuit
US2981865A (en) * 1959-06-08 1961-04-25 Transitronics Ltd Transistorized oscillatory system
US3018413A (en) * 1960-01-21 1962-01-23 Shurhit Products Inc Transistorized ignition system
US3035180A (en) * 1960-02-03 1962-05-15 Wilfrid O White & Sons Inc Compass
US3175123A (en) * 1960-12-08 1965-03-23 Globe Union Inc Oscillator ignition system
US3140423A (en) * 1961-02-06 1964-07-07 Lucas Industries Ltd Spark ignition apparatus for internal combustion engine
US3251351A (en) * 1963-10-14 1966-05-17 Shell Oil Co Electronic ignition system
US3264519A (en) * 1963-12-30 1966-08-02 Ford Motor Co Arc suppression means
US3309568A (en) * 1964-01-02 1967-03-14 Ford Motor Co Means including a saturable capacitor for reducing electrical energy dissipation in an electrical switching element
US3327164A (en) * 1964-01-18 1967-06-20 Bosch Gmbh Robert High-voltage ignition system for internal combustion engines
US3312210A (en) * 1964-10-12 1967-04-04 Ford Motor Co Ignition system
US3373314A (en) * 1965-06-25 1968-03-12 Ford Motor Co Transistorized ignition system with a saturable transformer control and voltage compensation means
US3407795A (en) * 1966-06-02 1968-10-29 Texaco Inc Ignition system for internal combustion engines
US3504231A (en) * 1967-06-26 1970-03-31 Andrews Mfg Co Breakerless oscillator ignition system
US3476098A (en) * 1968-05-23 1969-11-04 Peter Cook Ignition system

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3910246A (en) * 1973-08-10 1975-10-07 Texaco Inc Continuous-wave high-frequency AC ignition system
US3945362A (en) * 1973-09-17 1976-03-23 General Motors Corporation Internal combustion engine ignition system
US4061899A (en) * 1974-10-18 1977-12-06 Messer Griesheim Gmbh Arrangement for stabilization and ignition of welding arcs by ignition pulses
US4567874A (en) * 1980-02-21 1986-02-04 Siemens Aktiengesellschaft Ignition system for internal combustion engines
US4733646A (en) * 1986-04-30 1988-03-29 Aisin Seiki Kabushiki Kaisha Automotive ignition systems
US6112730A (en) * 1999-02-26 2000-09-05 Thomas C. Marrs Ignition system with clamping circuit for use in an internal combustion engine
US6135099A (en) * 1999-02-26 2000-10-24 Thomas C. Marrs Ignition system for an internal combustion engine
US20210383965A1 (en) * 2018-12-07 2021-12-09 Mitsubishi Electric Corporation Ignition system

Also Published As

Publication number Publication date
BR7108193D0 (pt) 1973-07-17
SE383018B (sv) 1976-02-23
NL159476B (nl) 1979-02-15
GB1323949A (en) 1973-07-18
ES397189A1 (es) 1974-05-01
CH532716A (de) 1973-01-15
DE2158138A1 (de) 1972-07-13
DE2158138B2 (de) 1975-05-28
IT944197B (it) 1973-04-20
JPS4713357A (enrdf_load_stackoverflow) 1972-07-08
NL7116184A (enrdf_load_stackoverflow) 1972-06-26
FR2119512A5 (enrdf_load_stackoverflow) 1972-08-04
JPS5345453B1 (enrdf_load_stackoverflow) 1978-12-06
CA951786A (en) 1974-07-23

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