US3913550A - Ignition system employing controlled-duration continuous-wave high-frequency spark energy - Google Patents

Ignition system employing controlled-duration continuous-wave high-frequency spark energy Download PDF

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Publication number
US3913550A
US3913550A US460243A US46024374A US3913550A US 3913550 A US3913550 A US 3913550A US 460243 A US460243 A US 460243A US 46024374 A US46024374 A US 46024374A US 3913550 A US3913550 A US 3913550A
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United States
Prior art keywords
circuit
phototransistor
spark
invention according
input transistor
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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
US460243A
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English (en)
Inventor
Robert E Canup
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Texaco Inc
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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 US460243A priority Critical patent/US3913550A/en
Priority to JP50009184A priority patent/JPS50133344A/ja
Priority to DE19752506401 priority patent/DE2506401A1/de
Priority to GB839275A priority patent/GB1458173A/en
Priority to NL7502635A priority patent/NL7502635A/xx
Priority to CH299075A priority patent/CH582310A5/xx
Priority to CA221,771A priority patent/CA1038444A/en
Priority to SE7503703A priority patent/SE405276B/xx
Priority to FR7510600A priority patent/FR2267459A1/fr
Priority to ES436368A priority patent/ES436368A1/es
Priority to IT22240/75A priority patent/IT1037222B/it
Priority to BR2214/75A priority patent/BR7502214A/pt
Application granted granted Critical
Publication of US3913550A publication Critical patent/US3913550A/en
Priority to HK424/77A priority patent/HK42477A/xx
Priority to JP1980095267U priority patent/JPS562064U/ja
Anticipated expiration legal-status Critical
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
    • F02P3/00—Other installations
    • F02P3/01—Electric spark ignition installations without subsequent energy storage, i.e. energy supplied by an electrical oscillator
    • 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
    • F02P7/00—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices
    • F02P7/06—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices of circuit-makers or -breakers, or pick-up devices adapted to sense particular points of the timing cycle
    • F02P7/073—Optical pick-up devices

Definitions

  • ABSTRACT An ignition system for internal combustion engines. It generates a controlled-duration continuous-wave highfrequency spark, and employs an output transformer in an oscillator which includes a control winding for starting and stopping the oscillator. There is an electronic switch in series with the control winding; and the spark intervals, including duration thereof, are determined by photoelectric engine-timed means that employ a phototransistor. There is a control circuit for the electronic switch, which circuit includes means for minimizing the response timeof the phototransistor.
  • This invention concerns ignitionsystems in general. More specifically, it relates to an improved ignition system for internal combustion engines, which employs a continuous-wave high-frequency spark generator. The invention is particularly related to improvements for the foregoing type of high-frequency spark-generating system.
  • the improvement acts to greatly reduce delays caused by response of the photoelectric elements.
  • Another object of the invention is to provide a system for use with high-frequency continuous-wave spark generators, particularly of the type that employs squarewave oscillators.
  • Such a system has been found to generate large amounts of radio-frequency signals, and since these tend to cause spurious actions in the control system, the elimination of radio-frequency energies from the control system becomes an important feature.
  • the invention concerns an improvement which comprises means incorporated with said control circuit for minimizing the response time of said phototransistor.
  • the invention concerns an improvement related to a combination with an ignition system for an internal combustion engine, wherein said system employes controlled-duration continuous-wave highfrequency spark energy.
  • the said spark energy is created by a squarewave oscillator having an output transformer, and having a control winding thereon for starting and stopping oscillation of said oscillator at the beginning and endof each spark interval.
  • the combination also comprises electronic switch means connected in series with said control winding for breaking and making a loading circuit which includes said control winding.
  • the said spark intervals are determined by photoelectric engine-timed means comprising a lightemitting diode and a phototransistor.
  • the said electronic switch means has a control circuit therefor which includessaid phototransistor.
  • this invention concerns the improvement which comprises first circuit means for connecting said phototransistor in a common collector configuration relative to said control circuit, and second circuit means for connecting the emitter of said phototransistor to the emitter of an input transistor of said control unit.
  • the said second circuit means includes a radio-frequency filter for blocking radiofrequency signals generated by said spark energy.
  • the improvement also comprises third circuit means including a temperature-sensitive resistor for energizing said light-emitting diode, in order to compensate for changes in ambient temperature at the engine-timed means.
  • It also comprises fourth circuit means including said light-emitting diode having a predetermined forward voltage drop, and connecting said diode to the base of said input transistor, all whereby said ignition system has improved response to the enginetimed spark-control means in giving temperature compensation and radio-frequency signal rejection.
  • FIG. 1 is a schematic circuit diagram illustrating a complete system according to one modification of the invention
  • FIG. 2 is another circuit diagram illustrating a different modification of the control-circuit portion of a system like that illustrated in FIG. I;
  • FIG. 3 is yet another circuit diagram illustrating only the engine-timedphotoelectric portion of a third modification of the system.
  • FIG. 1 DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • the complete ignition system illustrated includes the basic elements like those shown in one or more of the above-noted copending applications. Consequently, the details of such elements, as the oscillator per se or only the control unit (which have been fully described in those prior applications), need not be again set forth here. It will sufficient to note that the system illustrated in FIG. 1 includes an oscillator 11 that is enclosed within a dashed-line box 12, and-which employs an output above-noted applications Ser. Nos. 209,060; 246,212,
  • the system-in' cludes'a conventional ignition switch 17 which is shown in a dashed-line box 18 that includes a battery 19 'therein. It will be understood that the physical locations of the battery and ignition switch are usually quite widely separated on an automobile.
  • the battery 19 supplies power to the oscillator 11 via a permanent circuit connection 22. Also, when the ignition switch 17 is turned on, the battery 19 supplies DC power (via a circuit connection 23) to parallel circuits.
  • One includes a connection 24 for energizing the control winding 14, and the other includes a connection 25 that is for energizing a relay 26 that is shown enclosed in a dashed-line box carrying that reference number.
  • the control winding 14 is in series with an electronic switch, i.e., a transistor 29, which determines whether the winding 14 is AC-short-circuited or not.
  • a transistor 29 when the transistor 29 is conducting, the circuits include application of a DC bias for creating a core set on the transformer 13.
  • the transistor 29 is controlled for determining whether it is conducting or nonconducting by means of a control circuit 32 that includes all of the circuit elements between the base connection of transistor 29 and the output circuit of a control-circuit-input transistor 35.
  • the elementsof a control circuit like 32 are fully described in the foregoing application Ser. No. 263,803. I
  • the input transistor 35 is controlled by a photoelectric engine-timed unit 38 that includes a light-emitting diode 39 and a phototransistor 40. It will be appreciated that in the system as illustrated in FIG. 1, the unit 38 will be physically located on the distributor unit of the engine, and there will be included a shutter (not shown) which is driven by a timing shaft (not shown) from the engine so as to determine the engine timed intervals for producing spark energy.
  • the phototransistor 40 is con-. nected in a common collector configuration relative to the control circuit 32.
  • a common collector circuit designation often connotes a grounded collector, in this instance the common circuit to which the collector of phototransistor 40 is connected, is a positive DC circuit that is a common circuit of the control circuit 32.
  • the emitter of phototransistor 40' is connected via a circuit connection 43 to the base of the transistor 35.
  • Transistor 35 has a DC bias applied to it such that it is just below the cut-off point in the absence of any signal from the'emitter of phototransistor 40. Such bias is obtained by having a pair of resistors 46 and 47 connected in series from the com- 7 reduced since only a small voltage rise is needed to cause transistor 35 to conduct.
  • An ignition system may be made operative over a full range of temperature conditions that might be encountered with internal combustion engines, by including in the circuit for energizing the light-emitting diode 39 a temperaturesensitive resistor 53. This is because of the characteristics of light-emitting diodes and phototransistors.
  • the radiant energy emitted by a light-emitting diode is a function of the current passed through the junction, If too much current is passed through the junction, it will overheat, and the diode will be destroyed.
  • the safe current level of the diode will be determined by the ability of the junction to dissipate heat. Therefore, the safe current at high ambient temperatures is much lower than when the ambient temperature is low.
  • the light-emitting efficiency of the light-emitting diode increases as the junction temperature decreases, so that at low ambient temperatures more radiation will be emitted for the same junction current than when the ambient temperature is increased.
  • a phototransistor becomes less sensitive as the temperature is descreased, and more sensitive as the temperature rises, which tends to partially compensate for the opposite changing amount of radiation from the lightemitting diode.
  • the total effect is not exactly offsetting, and at low ambient temperatures it is necessary to increase the light-- ture while still maintaining the total or combined sensitivity. At the same time, the reduced current tends to keep the junction cooler which contributes to maintaining the emitting efficiency high.
  • a radio-frequency choke coil 56 located between the emitter of transistor 35 and ground. This prevents 1 radio-frequency-signals from reaching the base of a transistor 64. Also, there is a capacitor 68 connected from the collectorof transistor 35 to ground which shunts radio-frequency signals and, in addition, there is another capacitor 67 connected from the collector of input transistor 35 to the base thereof, which-causes a substantial amount of negative feedback to the radio-. frequency signals.
  • a coil 57 connected in the outputcircuit of the transistor 35, which is designed to improve the response of the control system to the desiredsignal frequency, e.g., to be resonant atabout 20,000 Hertz.
  • a resistor 60 connected acrossthe coil 57 so as to critically damp the'reson'ant effects inorder to prevent any undesired ringing.
  • FIG. 2 illustrates a modification of the controlunit portion of the syste m, and for the purpose of adequate orientationfthe same basic control circuit 32 as is illustrated in FIG. 1, is shovvn again in FIG. 2.
  • a typical control circuit like that designated by reference numeral 32 is shown and described in the copending application Ser. No 263,803 which is indicated in the crossreferences.
  • the transistor 29 is illustrated at the output end of the control cricuit 32 and, of course, it controls the starting and stopping of the oscillator 11 (see FIG. 1) by means of controlling AC-short-circuit conditions for the control winding 14 (see FIG. 1) in the same manner as indicated above in connection with FIG. 1.
  • the relay 26 and circuit connections 25 and 23 which were indicated in FIG. 1, are shown again in FIG. 2 y
  • the fast-reaction circuit related to the phototransistor 40 takes a modified form over that illustrated in FIG. 1.
  • the emitter connection 43 (see FIG. 1) from transistor 40 (FIG. 1) is applied to a terminal 71 that has a circuit connection 72 leading therefrom to one endof a radio-frequency chokecoil 73.
  • the other. end of the coil 73 leads directly to the emitter of a PNP transistor 76.
  • the base of transistor 76 is connected to the midpoint between a resistor 77 and a diode 78, which diode is one having a predetermined forward voltage drop in order to set the voltage on the base of transistor 76 at a desired level.
  • the output of transistor 76 goes to the control circuit 32 and, as illustrated, this is via a cireuitconnection 81 that goes to the base of another transistor 82.
  • the coil 73 is part of a radio frequency filter, which includes a parallel resistor 85, along with a pairof capacitors 86 and 87, which are connected to ground and to the ends of the coil 73 as well as to the ends of resistor 85.
  • FIG. 3 illustrates a modification of the phototransistor circuit portion of the control circuit. It is applicable particularly to a system like that shown in FIG. 2. This arrangement permits elimination of a resistor, along with making use of the light-emitting diode for two purposes so that the diode 78 may also be eliminated.
  • phototransistor 95 has its emitter connected directly to the emitter of a PNP transistor 98 that corresponds with transistor 76 of FIG. 2.
  • the base of transistor 98 is connected via a connector 99 to a junction between resistor 94 and diode 90.
  • the collector of transistor 98 goes directly to the base of another transistor 102 which corresponds to the transistor 82 of FIG. 2.
  • said spark energy being generated by an oscillator having an output transformer and having a control winding thereon for starting and stopping oscillation of said oscillator at the beginning and end of each spark interval,
  • spark intervals being determined by photoelectric engine-timed means including a phototransistor
  • said electronic switch means having a control circuit therefor including said photoelectric engine-timed means
  • circuit means for connecting said phototransistor in a common-collector configuration relative to said control circuit for minimizing the response time of said phototransistor.
  • improvement means also comprises means for connecting the emitter of said phototransistor to a prebiased base of an input transistor of said control circuit.
  • said improvement circuit means also comprises means for connecting the emitter of said-phototran-v sistor to the emitter of an input transistor of said control circuit.
  • said means for connecting said emitters comprises a radiofrequency filter for blocking radio-frequency signals generated by said spark energy.
  • said improvement circuit means further comprises reactance means in the output circuit of said input transistor for by-passing and blocking radiofrequency signals generated by said spark energy.
  • said improvement circuit means also comprises diode means in the base circuit of said input transistor, said diode means having a predetermined forward voltage drop in order to provide a desired voltage level to said input transistor.
  • said photoelectric engine-timed means comprises a light-emitting diode.
  • said improvement circuit means also comprises means for connecting the emitter of said phototransistor to the emitter of an input transistor of said control circuit.
  • said means for connecting said emitters comprises a radio-frequency filter for blocking radio-frequency signals generated by said spark energy.
  • improvement circuit means also comprises diode means -,in the base circuit of said input transistor,
  • said diode means having a predetermined forward voltage drop in order to provide a desired voltage level to said input transistor.
  • said means for connecting said emitters comprises a radiofrequency filter for blocking radio-frequency signals generated by said spark energy.
  • diode means comprises said light-emitting ;diode.
  • ternal combustion engine wherein said system employs controlled-duration, continuous square wave, highfrequency spark energy,
  • said spark energy being generated by a squarewave oscillator having an output transformer, and having a control winding thereon for starting and stopping oscillation of said oscillator at the beginning and end of each spark interval, electronic switch means connected in series with said control winding for breaking and making a loading circuit which includes said control winding, said spark intervals being determined by photoelectric engine-timed means 'comprising a lightemitting diode and a phototransistor, I said electronic switch means having a control circuit therefor including said phototransistor, the improvement comprising first circuit means for connecting said phototransistor in a commoncollectorconfiguration relative to said control circuit, second circuit means for connecting the emitter of said phototransistor to the emitter of an input transistor of said control circuit, said second circuit means including a radiofrequency filter for blocking radio-frequency signals generated by said spark energy, third circuit means including a temperature-sensitive resistor for energizing said' light-emitting diode in order to compensate for change in ambient temperature at said engine-timed means, fourth circuit means
US460243A 1974-04-11 1974-04-11 Ignition system employing controlled-duration continuous-wave high-frequency spark energy Expired - Lifetime US3913550A (en)

Priority Applications (14)

Application Number Priority Date Filing Date Title
US460243A US3913550A (en) 1974-04-11 1974-04-11 Ignition system employing controlled-duration continuous-wave high-frequency spark energy
JP50009184A JPS50133344A (xx) 1974-04-11 1975-01-20
DE19752506401 DE2506401A1 (de) 1974-04-11 1975-02-15 Zuendanordnung, die mit ungedaempfter hochfrequenz-funkenenergie arbeitet, deren dauer gesteuert wird
GB839275A GB1458173A (en) 1974-04-11 1975-02-28 Ignition system
NL7502635A NL7502635A (nl) 1974-04-11 1975-03-06 Ontstekingsinrichting.
CH299075A CH582310A5 (xx) 1974-04-11 1975-03-10
CA221,771A CA1038444A (en) 1974-04-11 1975-03-11 Ignition system employing controlled-duration continuous-wave high-frequency spark energy
SE7503703A SE405276B (sv) 1974-04-11 1975-04-01 Tendanleggning for en forbrenningsmotor
FR7510600A FR2267459A1 (xx) 1974-04-11 1975-04-04
ES436368A ES436368A1 (es) 1974-04-11 1975-04-07 Sistema de encendido para motor de combustion interna.
IT22240/75A IT1037222B (it) 1974-04-11 1975-04-10 Dispositivo di accensione per motori a combustione interna
BR2214/75A BR7502214A (pt) 1974-04-11 1975-04-11 Aperfeicoamentos em sistema de ignicao para motor de combustao interna
HK424/77A HK42477A (en) 1974-04-11 1977-08-18 Ignition system
JP1980095267U JPS562064U (xx) 1974-04-11 1980-07-08

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US460243A US3913550A (en) 1974-04-11 1974-04-11 Ignition system employing controlled-duration continuous-wave high-frequency spark energy

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US3913550A true US3913550A (en) 1975-10-21

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US460243A Expired - Lifetime US3913550A (en) 1974-04-11 1974-04-11 Ignition system employing controlled-duration continuous-wave high-frequency spark energy

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US (1) US3913550A (xx)
JP (2) JPS50133344A (xx)
BR (1) BR7502214A (xx)
CA (1) CA1038444A (xx)
CH (1) CH582310A5 (xx)
DE (1) DE2506401A1 (xx)
ES (1) ES436368A1 (xx)
FR (1) FR2267459A1 (xx)
GB (1) GB1458173A (xx)
HK (1) HK42477A (xx)
IT (1) IT1037222B (xx)
NL (1) NL7502635A (xx)
SE (1) SE405276B (xx)

Cited By (10)

* 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
US4051828A (en) * 1975-12-29 1977-10-04 Eugene Frank Topic Ignition system for use with internal combustion engines
US4077380A (en) * 1975-05-14 1978-03-07 Texaco Inc. Controlled-duration continuous-wave high-frequency ignition system
US4084566A (en) * 1975-06-19 1978-04-18 Weiler Kurt W Electronic breaker points for the ignition system of a gasoline engine
US4095564A (en) * 1975-11-05 1978-06-20 Hochstein Peter A Method and apparatus for igniting air-fuel mixture in an engine
FR2418875A1 (fr) * 1978-03-03 1979-09-28 Texaco Development Corp Dispositif d'allumage pour moteur a combustion interne
US4341195A (en) * 1977-04-06 1982-07-27 Ngk Spark Plug Co., Ltd. Ignition system for spark plugs capable of removing carbon deposits
EP0066749A1 (en) * 1981-06-01 1982-12-15 Aisin Seiki Kabushiki Kaisha Ignition system for internal-combustion engines
US4416246A (en) * 1982-04-30 1983-11-22 Texaco Inc. Internal combustion engine with fuel injection and AC type high tension spark
US5886476A (en) * 1997-06-27 1999-03-23 General Motors Corporation Method and apparatus for producing electrical discharges

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2616693C3 (de) * 1976-04-15 1980-09-18 Robert Bosch Gmbh, 7000 Stuttgart Zündanlage für Brennkraftmaschinen

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3502060A (en) * 1968-10-16 1970-03-24 Buzick John W Electronic ignition system
US3512042A (en) * 1968-03-27 1970-05-12 Ranco Inc High frequency pulsed ignition system
US3581725A (en) * 1968-09-09 1971-06-01 Silicon Systems Inc Transistorized ignition system
US3671805A (en) * 1970-01-09 1972-06-20 Motorola Inc Ignition system
US3710131A (en) * 1971-01-08 1973-01-09 Lumenition Ltd Transistorized ignition systems
US3807378A (en) * 1972-03-23 1974-04-30 W Wernet Ignition system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS411367Y1 (xx) * 1965-04-30 1966-02-03
JPS4331448Y1 (xx) * 1966-02-25 1968-12-20

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3512042A (en) * 1968-03-27 1970-05-12 Ranco Inc High frequency pulsed ignition system
US3581725A (en) * 1968-09-09 1971-06-01 Silicon Systems Inc Transistorized ignition system
US3502060A (en) * 1968-10-16 1970-03-24 Buzick John W Electronic ignition system
US3671805A (en) * 1970-01-09 1972-06-20 Motorola Inc Ignition system
US3710131A (en) * 1971-01-08 1973-01-09 Lumenition Ltd Transistorized ignition systems
US3807378A (en) * 1972-03-23 1974-04-30 W Wernet Ignition system

Cited By (10)

* 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
US4077380A (en) * 1975-05-14 1978-03-07 Texaco Inc. Controlled-duration continuous-wave high-frequency ignition system
US4084566A (en) * 1975-06-19 1978-04-18 Weiler Kurt W Electronic breaker points for the ignition system of a gasoline engine
US4095564A (en) * 1975-11-05 1978-06-20 Hochstein Peter A Method and apparatus for igniting air-fuel mixture in an engine
US4051828A (en) * 1975-12-29 1977-10-04 Eugene Frank Topic Ignition system for use with internal combustion engines
US4341195A (en) * 1977-04-06 1982-07-27 Ngk Spark Plug Co., Ltd. Ignition system for spark plugs capable of removing carbon deposits
FR2418875A1 (fr) * 1978-03-03 1979-09-28 Texaco Development Corp Dispositif d'allumage pour moteur a combustion interne
EP0066749A1 (en) * 1981-06-01 1982-12-15 Aisin Seiki Kabushiki Kaisha Ignition system for internal-combustion engines
US4416246A (en) * 1982-04-30 1983-11-22 Texaco Inc. Internal combustion engine with fuel injection and AC type high tension spark
US5886476A (en) * 1997-06-27 1999-03-23 General Motors Corporation Method and apparatus for producing electrical discharges

Also Published As

Publication number Publication date
IT1037222B (it) 1979-11-10
BR7502214A (pt) 1975-12-09
NL7502635A (nl) 1975-10-14
CH582310A5 (xx) 1976-11-30
HK42477A (en) 1977-08-26
ES436368A1 (es) 1977-01-01
SE7503703L (sv) 1975-10-13
CA1038444A (en) 1978-09-12
JPS50133344A (xx) 1975-10-22
JPS562064U (xx) 1981-01-09
FR2267459A1 (xx) 1975-11-07
GB1458173A (en) 1976-12-08
DE2506401A1 (de) 1975-10-30
SE405276B (sv) 1978-11-27

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