US3910246A - Continuous-wave high-frequency AC ignition system - Google Patents

Continuous-wave high-frequency AC ignition system Download PDF

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Publication number
US3910246A
US3910246A US387427A US38742773A US3910246A US 3910246 A US3910246 A US 3910246A US 387427 A US387427 A US 387427A US 38742773 A US38742773 A US 38742773A US 3910246 A US3910246 A US 3910246A
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United States
Prior art keywords
winding
frequency
circuit
transistors
ignition system
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.)
Expired - Lifetime
Application number
US387427A
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English (en)
Inventor
Robert E Canup
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.)
Texaco Inc
Original Assignee
Texaco Inc
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 Texaco Inc filed Critical Texaco Inc
Priority to US387427A priority Critical patent/US3910246A/en
Priority to JP2868274A priority patent/JPS5417897B2/ja
Priority to GB2710374A priority patent/GB1450854A/en
Priority to ZA00744091A priority patent/ZA744091B/xx
Priority to AU70835/74A priority patent/AU476322B2/en
Priority to AR254536A priority patent/AR203398A1/es
Priority to DE2434574A priority patent/DE2434574C3/de
Priority to NLAANVRAGE7409909,A priority patent/NL174488C/xx
Priority to ES74428538A priority patent/ES428538A1/es
Priority to FR7425647A priority patent/FR2240364B1/fr
Priority to BR6223/74A priority patent/BR7406223A/pt
Priority to CH1044574A priority patent/CH582309A5/xx
Priority to IT26133/74A priority patent/IT1019800B/it
Priority to SE7410174A priority patent/SE402152B/xx
Priority to CA206,551A priority patent/CA1044751A/en
Priority to DK425574A priority patent/DK425574A/da
Application granted granted Critical
Publication of US3910246A publication Critical patent/US3910246A/en
Priority to HK327/77A priority patent/HK32777A/xx
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
    • F02P3/01—Electric spark ignition installations without subsequent energy storage, i.e. energy supplied by an electrical oscillator

Definitions

  • the inverter employs a single transformer with a high-voltage output winding and a pair of transistors coupled to an input winding plus a feedback winding. There is a saturable-core inductor also coupled to the transistors for causing a frequency shift in the inverter AC signals under load conditions in the spark-signal output.
  • This invention concerns ignition systems for internal combustion engines in general, and more specifically relates to such a system that employs high-frequency continuous-wave AC signals to produce a controlled spark duration for each ignition. It particularly employs only a single transformer. And, it includes means for causing a frequency shift as the output circuit of the oscillator changes from no-load to load conditions.
  • this invention is particularly concerned with a single-transformer, continuous-wave, high-frequency AC ignition system which includes an inverter with means for shifting the oscillation frequency from no-load to load conditions as the spark load appears in the output circuit of the inverterv SUMMARY OF THE INVENTION
  • this invention concerns an ignition system for an internal combustion engine which system comprises an inverter including a single transformer having a secondary winding for supplying a continuous-wave high frequency spark-signal output, only during controlled sparking intervals. It also comprises a primary winding with at least one transistor connected in circuit therewith, and a feedback winding connected to said transistor for providing an oscillator having a predetermined load frequency during said sparking intervals.
  • the said load frequency is substantially different from a harmonic frequency of the fundamental resonant frequency of said secondary winding circuit.
  • the inhaving a high-voltage AC spark-signal output winding
  • It also comprises a feedback winding on said transformer, a control winding on said transformer, and a pair of transistors. It also comprises first circuit means for connecting said transistors to said input and feedback windings to form a square-wave high-frequency oscillator, and second circuit means for connecting a DC source of power to said oscillator. In addition, it comprises a saturable core inductor, and third circuit means for connecting said inductor into said oscillator whereby the no-load frequency equals a harmonic of the fundamental resonant frequency of said output-winding circuit. The said load frequency is substantially different from said harmonic frequency.
  • FIGURE of drawing illustrates a schematic circuit diagram of an ignition system according to the invention.
  • the schematic circuit diagram illustrates an ignition system. It includes a single transformer 11 that has a high-voltage secondary winding 12 which is connected to a ground or common circuit at one end. The other end is connected to a spark-signal circuit which may be for an internal combustion engine (not shown). This is indicated by the caption HIGH VOLTAGE TO DISTRIBUTOR CAP adjacent to a circuit connection 13.
  • the transformer 11 also has a center-tapped primary winding 16 and a separate feedback winding 17 as well as a control winding 18 thereon.
  • a source of DC power which may be a bat tery 23, as indicated.
  • This may be a standard automotive battery, e.g., one providing a 12-volt supply, or it may be a 24-volt type battery.
  • Battery 23 is connected into the circuit with one terminal grounded, as indicated at reference no. 24. The other terminal is connected via circuit connections 27 and 28 to a center tap 29 on the transformer primary winding 16.
  • the collector electrodes of a pair of transistors 33 and 34 Connected to the ends of primary winding 16 are the collector electrodes of a pair of transistors 33 and 34.
  • the emitter electrodes of these transistors are each connected to ground, as indicated by reference num bers 35 and 36, respectively.
  • the base electrodes of the transistors 33 and 34 are connected to the ends of the feedback winding 17, via circuit connections 39 and 40, respectively. Included in the foregoing base drive circuit from feedback winding 17, there is a resistor 41 for partially determining the oscillator frequency.
  • diodes 43 and 44 connected between each of the base electrodes of transistors 33 and 34 and ground, there are diodes 43 and 44, respectively, which act to protect each transistor against harmful reverse voltage that may be applied between its base electrode and ground.
  • the capacitor 30 acts to supply initial energy to the transistors when they conduct, and this compensates for the voltage drop that develops due to the high current which they draw. Consequently, an output voltage in the secondary winding 12 is of greater magnitude than would otherwise be the
  • the control winding 18 is included on the transformer l 1.
  • This type of inverter as applied to ignition systems, has been described in my above-noted application Ser. No. 333,856, filed Feb. 20, 1973. It has a DC bias current applied to the control winding 18 during the nonoscillating periods. Simultaneously, there is a low impedance path connected across the winding 18.
  • the DC bias current is applied via an ignition switch 46 that has a pair of stationary terminals 47 which are A both connected directly to the positive terminal of battery 23 via a circuit connection 48.
  • the movable switch arm of switch 46 When the movable switch arm of switch 46 is placed into electrical contact with either of the terminals 47 (for start or run conditions), the battery voltage from battery 23 is connected over the circuit connection 48 and on via a connection 49 to a resistor 50 and a diode 51 to a circuit connection point 52.
  • circuit carrying DC bat tery potential continues via illustrated circuit connections 55 and 56 to one end of the control winding 18.
  • the other end of winding 18 is connected via circuit connections 59 and 60 to one diagonal point 58 of a diode bridge 61.
  • An adjacent diagonal 62 is connected via a circuit connection 63 to the collector electrode of a transistor 64 which acts as an electronic switch.
  • the emitter electrode of transistor 64 is connected to ground, as indicated by a reference number 67.
  • this inverter circuit acts as a square-wave oscillator which generates high-voltage continuous-wave spark signals in the secondary winding 12 at desired instants for controlled intervals of time.
  • the intervals are controlled by the control winding 18 which stops the oscillations when a lowimpedance AC circuit is applied across the winding.
  • Such low-impedance AC circuit across control winding 18 includes a diode bridge 61 and also a Zener diode that is connected between the circuit point 52 and a diagonal point 71 on the bridge 61.
  • the transistor 64 whenever the transistor 64 is conducting, it provides a low-impedance AC path across the winding 18 which may be traced as follows. Beginning at the lower end (as viewed in the drawing) of winding 18 and going via connections 59 and 60 to the bridge 61, current flowing in such downward direction will have a low-impedance path via the upper left-hand diode of the bridge 61 and the circuit connection 63 to and through the transistor 64 and the ground connection 67. A return circuit continues via two parallel paths. The primary path goes via a ground connection 74, a diagonal point 75, diode 78, diagonal point 71, a conductor 79, Zener diode 70, and then via connections 55 and 56 to the other side of the winding 18.
  • the other return circuit path goes from the ground connection 24 to the battery 23 and then via the circuit connections 27 and 48 to the switch 46 (now closed). Then it continues via the connection 49, the resistor 50, the diode 51, the connections 55 and 56 to the other side of the winding 18.
  • the low-impedance path for return current flow in the opposite direction may be traced via connections 56 and 55 to the circuit point 52.
  • the path then continues through the Zener diode 70 (breakdown voltage exceeded) to the diagonal point 71 on the bridge 61 and then through the lower left-hand diode of the bridge 61 to the diagonal point 62. From point 62 it continues over the connection 63 to the transistor 64 and, thence, via the ground connection 67 back through another ground connection 74 to an opposite diagonal point 75 on the bridge 61. From that point it may be traced over a resistor 76 and a diode 77 to the diagonal point 58 and on via the connection 60 and the connection 59 to the other end of winding 18.
  • capacitors 80, 81 and 82 there are additional capacitors, e.g., capacitors 80, 81 and 82, provided for radio-frequency by-pass. This is important since the oscillator is a square-wave type which consequently generates substantial amounts of radio-frequency energies.
  • the frequency of the oscillator may be controlled since the inductor can be made to saturate at a desired frequency.
  • the open circuit oscillating frequency of the system may be set to match a harmonic frequency of the fundamental resonant frequency that exists in the output circuit to which winding 12 is connected.
  • the power rating of the transistors 33 and 34 may be chosen along with the primary-to-secondary turns ratio of the transformer and the primary inductance under load, so that adequate spark-plug current can be supplied.
  • Ignition system for an internal combustion engine comprising an inverter including a single transformer having a secondary winding for supplying a continuouswave, high-frequency spark-signal output only during controlled sparking intervals, a primary wind ing with at least one transistor connected in circuit therewith, and a feedback winding connected to said transistor for providing an oscillator having a predetermined load frequency during said spark intervals,
  • said load frequency being substantially different from a harmonic frequency of the fundamental resonant frequency of said secondary winding circuit
  • saturable-core inductor means connected in circuit with said feedback winding for determining the noload frequency to be substantially equal to said harmonic frequency.
  • Ignition system according to claim 5, wherein said inverter also includes circuit means for connecting a DC source between said primary winding center tap and said collector-emitter circuits at a point between said transistors.
  • a continuous-wave highfrequency ignition system wherein said system comprises a single transformer having a high voltage AC spark signal output winding,
  • first circuit means for connecting said transistors to said input and feedback windings to form a squarewave high-frequency oscillator
  • said load frequency being substantially different from said harmonic frequency.

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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)
US387427A 1973-08-10 1973-08-10 Continuous-wave high-frequency AC ignition system Expired - Lifetime US3910246A (en)

Priority Applications (17)

Application Number Priority Date Filing Date Title
US387427A US3910246A (en) 1973-08-10 1973-08-10 Continuous-wave high-frequency AC ignition system
JP2868274A JPS5417897B2 (de) 1973-08-10 1974-03-14
GB2710374A GB1450854A (en) 1973-08-10 1974-06-19 Continuous-wave high-frequency ac ignition system
ZA00744091A ZA744091B (en) 1973-08-10 1974-06-25 Continuous-wave high-frquency ac ignition system
AU70835/74A AU476322B2 (en) 1973-08-10 1974-07-04 Continuous-wave high-frequency ac ignition system
AR254536A AR203398A1 (es) 1973-08-10 1974-07-04 Dispositivo de encendido para motor de combustion interna
DE2434574A DE2434574C3 (de) 1973-08-10 1974-07-18 Zündanordnung für Brennkraftmaschinen
ES74428538A ES428538A1 (es) 1973-08-10 1974-07-23 Sistema de encendido para motor de combustion interna.
NLAANVRAGE7409909,A NL174488C (nl) 1973-08-10 1974-07-23 Ontstekingsinrichting voor een interne verbrandingsmotor.
FR7425647A FR2240364B1 (de) 1973-08-10 1974-07-24
BR6223/74A BR7406223A (pt) 1973-08-10 1974-07-29 Sistema de ignicao de ca de onda continua de alta frequencia
CH1044574A CH582309A5 (de) 1973-08-10 1974-07-30
SE7410174A SE402152B (sv) 1973-08-10 1974-08-08 Tendanleggning for forbrenningsmotor
IT26133/74A IT1019800B (it) 1973-08-10 1974-08-08 Impianto di accensione per motori a combustione interna ad alta frequenza
CA206,551A CA1044751A (en) 1973-08-10 1974-08-08 Continuous-wave high-frequency ac ignition system
DK425574A DK425574A (de) 1973-08-10 1974-08-09
HK327/77A HK32777A (en) 1973-08-10 1977-06-23 Continuous-wave high-frequency ac ignition system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US387427A US3910246A (en) 1973-08-10 1973-08-10 Continuous-wave high-frequency AC ignition system

Publications (1)

Publication Number Publication Date
US3910246A true US3910246A (en) 1975-10-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
US387427A Expired - Lifetime US3910246A (en) 1973-08-10 1973-08-10 Continuous-wave high-frequency AC ignition system

Country Status (17)

Country Link
US (1) US3910246A (de)
JP (1) JPS5417897B2 (de)
AR (1) AR203398A1 (de)
AU (1) AU476322B2 (de)
BR (1) BR7406223A (de)
CA (1) CA1044751A (de)
CH (1) CH582309A5 (de)
DE (1) DE2434574C3 (de)
DK (1) DK425574A (de)
ES (1) ES428538A1 (de)
FR (1) FR2240364B1 (de)
GB (1) GB1450854A (de)
HK (1) HK32777A (de)
IT (1) IT1019800B (de)
NL (1) NL174488C (de)
SE (1) SE402152B (de)
ZA (1) ZA744091B (de)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4022177A (en) * 1975-04-23 1977-05-10 Texaco Inc. Controlled spark duration ignition system
US4203404A (en) * 1978-03-13 1980-05-20 Texaco Inc. Distributorless ignition method and system for a multicylinder internal combustion engine
US4216412A (en) * 1977-07-05 1980-08-05 Gerry Martin E Transient modulated AC ignition system
US4293797A (en) * 1979-05-01 1981-10-06 Gerry Martin E Inductive-capacitive cyclic charge-discharge ignition system
US4358813A (en) * 1980-11-20 1982-11-09 Matsushita Electric Industrial Co., Ltd. Ignition apparatus for a burner
US4733646A (en) * 1986-04-30 1988-03-29 Aisin Seiki Kabushiki Kaisha Automotive ignition systems
US5065073A (en) * 1988-11-15 1991-11-12 Frus John R Apparatus and method for providing ignition to a turbine engine
US5148084A (en) * 1988-11-15 1992-09-15 Unison Industries, Inc. Apparatus and method for providing ignition to a turbine engine
US5245252A (en) * 1988-11-15 1993-09-14 Frus John R Apparatus and method for providing ignition to a turbine engine
US5473502A (en) * 1992-09-22 1995-12-05 Simmonds Precision Engine Systems Exciter with an output current multiplier
US5754011A (en) * 1995-07-14 1998-05-19 Unison Industries Limited Partnership Method and apparatus for controllably generating sparks in an ignition system or the like
CN113958416A (zh) * 2021-11-11 2022-01-21 四川泛华航空仪表电器有限公司 高压稳频点火装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5729743A (en) * 1980-07-26 1982-02-17 Takenaka Komuten Co Application of reinforced concrete composite floor board
US5509048A (en) * 1993-07-26 1996-04-16 Meidan; Reuven Radio transceiver with interface apparatus which visually displays information and method therefor

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3032683A (en) * 1959-01-06 1962-05-01 John G Ruckelshaus Ignition system
US3260299A (en) * 1966-07-12 Transistor ignition system
US3407795A (en) * 1966-06-02 1968-10-29 Texaco Inc Ignition system for internal combustion engines
US3426740A (en) * 1966-10-21 1969-02-11 Motorola Inc Distributor
US3448732A (en) * 1966-09-06 1969-06-10 August C Weiss Capacitor-discharge electronic ignition system and a method for adjusting the circuit
US3749973A (en) * 1970-12-22 1973-07-31 Texaco Inc Continuous wave high frequency ignition system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3260299A (en) * 1966-07-12 Transistor ignition system
US3032683A (en) * 1959-01-06 1962-05-01 John G Ruckelshaus Ignition system
US3407795A (en) * 1966-06-02 1968-10-29 Texaco Inc Ignition system for internal combustion engines
US3448732A (en) * 1966-09-06 1969-06-10 August C Weiss Capacitor-discharge electronic ignition system and a method for adjusting the circuit
US3426740A (en) * 1966-10-21 1969-02-11 Motorola Inc Distributor
US3749973A (en) * 1970-12-22 1973-07-31 Texaco Inc Continuous wave high frequency ignition system

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4022177A (en) * 1975-04-23 1977-05-10 Texaco Inc. Controlled spark duration ignition system
US4216412A (en) * 1977-07-05 1980-08-05 Gerry Martin E Transient modulated AC ignition system
US4203404A (en) * 1978-03-13 1980-05-20 Texaco Inc. Distributorless ignition method and system for a multicylinder internal combustion engine
US4293797A (en) * 1979-05-01 1981-10-06 Gerry Martin E Inductive-capacitive cyclic charge-discharge ignition system
US4358813A (en) * 1980-11-20 1982-11-09 Matsushita Electric Industrial Co., Ltd. Ignition apparatus for a burner
US4733646A (en) * 1986-04-30 1988-03-29 Aisin Seiki Kabushiki Kaisha Automotive ignition systems
US5245252A (en) * 1988-11-15 1993-09-14 Frus John R Apparatus and method for providing ignition to a turbine engine
US5148084A (en) * 1988-11-15 1992-09-15 Unison Industries, Inc. Apparatus and method for providing ignition to a turbine engine
US5065073A (en) * 1988-11-15 1991-11-12 Frus John R Apparatus and method for providing ignition to a turbine engine
US5399942A (en) * 1988-11-15 1995-03-21 Unison Industries Limited Partnership Apparatus and method for providing ignition to a turbine engine
US5561350A (en) * 1988-11-15 1996-10-01 Unison Industries Ignition System for a turbine engine
US5473502A (en) * 1992-09-22 1995-12-05 Simmonds Precision Engine Systems Exciter with an output current multiplier
US5754011A (en) * 1995-07-14 1998-05-19 Unison Industries Limited Partnership Method and apparatus for controllably generating sparks in an ignition system or the like
US6034483A (en) * 1995-07-14 2000-03-07 Unison Industries, Inc. Method for generating and controlling spark plume characteristics
US6353293B1 (en) 1995-07-14 2002-03-05 Unison Industries Method and apparatus for controllably generating sparks in an ignition system or the like
US20020101188A1 (en) * 1995-07-14 2002-08-01 Unison Industries, Inc. Method and apparatus for controllably generating sparks in an ingnition system or the like
US7095181B2 (en) 1995-07-14 2006-08-22 Unsion Industries Method and apparatus for controllably generating sparks in an ignition system or the like
CN113958416A (zh) * 2021-11-11 2022-01-21 四川泛华航空仪表电器有限公司 高压稳频点火装置
CN113958416B (zh) * 2021-11-11 2023-11-17 四川泛华航空仪表电器有限公司 高压稳频点火装置

Also Published As

Publication number Publication date
FR2240364A1 (de) 1975-03-07
NL7409909A (nl) 1975-02-12
SE402152B (sv) 1978-06-19
AU476322B2 (en) 1976-09-16
BR7406223A (pt) 1976-03-23
NL174488B (nl) 1984-01-16
HK32777A (en) 1977-06-30
SE7410174L (de) 1975-02-11
FR2240364B1 (de) 1980-10-31
JPS5417897B2 (de) 1979-07-03
DE2434574C3 (de) 1980-03-13
ZA744091B (en) 1975-11-26
DK425574A (de) 1975-04-07
DE2434574B2 (de) 1979-07-19
GB1450854A (en) 1976-09-29
JPS5037928A (de) 1975-04-09
AU7083574A (en) 1976-01-08
AR203398A1 (es) 1975-09-08
CH582309A5 (de) 1976-11-30
IT1019800B (it) 1977-11-30
DE2434574A1 (de) 1975-02-27
ES428538A1 (es) 1976-12-01
CA1044751A (en) 1978-12-19
NL174488C (nl) 1984-06-18

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