US3871347A - Constant dwell ignition system - Google Patents

Constant dwell ignition system Download PDF

Info

Publication number
US3871347A
US3871347A US308125A US30812572A US3871347A US 3871347 A US3871347 A US 3871347A US 308125 A US308125 A US 308125A US 30812572 A US30812572 A US 30812572A US 3871347 A US3871347 A US 3871347A
Authority
US
United States
Prior art keywords
direct current
ignition
capacitor
circuit means
switching device
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
US308125A
Other languages
English (en)
Inventor
Howard F Weber
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.)
Motorola Solutions Inc
Original Assignee
Motorola 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 Motorola Inc filed Critical Motorola Inc
Priority to US308125A priority Critical patent/US3871347A/en
Priority to SE7313571A priority patent/SE396119B/xx
Priority to GB4688673A priority patent/GB1414888A/en
Priority to IT53228/73A priority patent/IT994461B/it
Priority to DE2357482A priority patent/DE2357482C3/de
Priority to JP48130647A priority patent/JPS4981730A/ja
Priority to FR7341313A priority patent/FR2207530A5/fr
Application granted granted Critical
Publication of US3871347A publication Critical patent/US3871347A/en
Priority to JP1979054273U priority patent/JPS54147334U/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • F02P3/02—Other installations having inductive energy storage, e.g. arrangements of induction coils
    • F02P3/04—Layout of circuits
    • F02P3/045—Layout of circuits for control of the dwell or anti dwell time
    • F02P3/0453—Opening or closing the primary coil circuit with semiconductor devices

Definitions

  • An electronic triggering circuit for an ignition system to develop electric signals which correspond to the closing and opening of breaker points operates to supply a constant dwell (constant ratio of on-to-off) pulses to the ignition primary winding of the ignition coil, except at low engine speeds whereupon the triggering circuit reverts to a constant off time circuit.
  • Variable dwell transistorized ignition circuits operating on the Kettering principle have been proposed in which the current through the primary winding of the ignition coil is turned on only shortly before the ignition point and is turned off at the moment the ignition pulse is desired.
  • the current is connected to the ignition coil long before the ignition time and a strong ignition pulse is provided.
  • the frequency of the triggering pulses is increased and current is connected, only shortly before the ignition time, and the ignition impulse to the coil is weak so that ignition degrades with increased engine speed.
  • an ignition system which does not waste power at low rpms, and which employs a constant ratio of on time (charging current through the primary winding of the coil) to off time, or a constant dwell irrespective of the speed of the engine in order to improve the performance of transistor ignition systems over those previously known.
  • a first transistor switch is rendered conductive and nonconductive by input pulses obtained from a magnetic pickup which can be located in a conventional distributor housing.
  • This first transistor switch is connected to a source of potential through a first current source.
  • a second transistor switching device has the emitter collector electrode path connected to the source of potential, and the base of the second transistor switching device is connected to the potential source through a second current source.
  • a charge storage capacitor is connected between the collector of the first transistor switching device and the base of the second transistor switching device, with a charge path for the capacitor being completed, when the first transistor switching device is nonconductive from the first current source through the base emitter path of the second transistor, which is rendered conductive.
  • the primary winding of the coil is coupled through a semiconductor switch with the collector of the second transistor switching device so that current flows through the primary winding when the second transistor is conductive.
  • the second transistor When the first transistor is subsequently rendered conductive, the second transistor is immediately biased to a non-conductive state, and the capacitor initially discharges and then recharges through the second current source and the collector/emitter path of the first transistor.
  • the capacitor When the capacitor becomes charged in the reverse direction by the second current source, it biases the second transistor back to its state of conduction and coil current commences to flow, following the interruption of coil current which occurred during the time that the second transistor was non-conductive.
  • FIGURE of the drawing is a detailed schematic circuit diagram of a preferred embodiment of the invention.
  • Direct current voltage for providing the current and voltage supplies for operating the system shown in the drawing is obtained from a battery which may be coupled to a voltage supply terminal 10.
  • the battery is connected through an ignition switch 11 and a ballast resistor 12 to the upper end of the primary winding of an ignition coil 14, which may be of any suitable type.
  • the lower end of the primary winding of the ignition coil 14 is connected through the collector/emitter path of a switching transistor 15, with the emitter of the switching transistor 15 being connected to ground.
  • the operation of the circuit is such that when the transistor 15 is non-conductive no current is permitted to flow through the primary winding of the coil 14, and when the transistor 15 is rendered conductive current flows through the primary winding of the coil 14 to charge the coil.
  • each time the transistor 15 is rendered non-conductive the flux in the coil 14 collapses to induce the spark voltage in the secondary winding of the coil 14, which is connected to the spark plugs (not shown) of the engine.
  • the circuit shown in the drawing operates to provide a constant dwell, or constant ratio of on time to off time for the current flow in the primary winding of the coil 14. This is accomplished by the control circuit which drives the transistor switch 15.
  • a magnetic pickup device (not shown) is positioned within the distributor of a vehicle to produce a generally sinusoidal output waveform 17, which is applied to the ignition system across a pair of input terminals 19 and 20.
  • a suitable pickup device which can be used to produce the signal 17 may be of the type disclosed in US. Pat. No. 3,390,668, issued to Arthur G. Hufton and assigned to the same assignee as the present application.
  • the input pulses are applied across a capacitor 21 and through a diode 22 and resistor 24 to the base of a first switching transistor (NPN) 26, the emitter of which is connected to ground, and the collector of which is connected through a resistor 27 and diode 28, to a voltage supply lead 30 which is coupled through a resistor 31 to the ignition switch 11.
  • the resistor 27 operates as a current source for the circuit. Assume initially that the transistor 26 is rendered nonconductive. This condition occurs on the negative half cycles of the input waveform 17, which causes the emitter base junction of the transistor 26 to be reverse biased. When this occurs, the current supplied by the current source 27 flows through a charge storage capacitor 34 and the base emitter junction of another switching transistor 36 to charge the capacitor 34 from the current source resistor 27.
  • the transistor 36 is rendered conductive causing a relatively low, or near ground potential to appear on its collector.
  • This potential applied to the base of an amplifier transistor 38 through a coupling resistor 39 renders the transistor 38 non-conductive.
  • the collector of the transistor 38 is connected to the voltage supply lead 30 through a diode 41 and a resistor 40, so that the junction of the diode 41 and resistor 40 rises to a voltage nearer the voltage on the supply lead 30.
  • This renders an NPN Darlington transistor 42 conductive causing a relatively positive potential to appear across a load resistor 43 biasing the switching transistor into a state of conduction.
  • the reverse bias is removed from the base emitter junction of the transistor 26, and it is rendered conductive and held in conduction by the potential applied to its base through resistor 45 and 24 and resistors 49 and 52.
  • the transistor 26 initially conducts, the potential applied by the discharge of capacitor 34 to the base of the transistor 36 renders the transistor 36 non-conductive, and the capacitor 34 commences charging in the opposite direction through a second current source resistor 47 and the collector/emitter path of the switching transistor 26.
  • the transistor 36 is rendered nonconductive, the conductive states of transitors 38, 42 and 15 change so that the transistor 15 now also is nonconductive and current flow through the primary winding of the ignition coil 14 is interrupted. This causes a rapid collapse of flux in the primary winding of the ignition coil 14, inducing the high voltage spark pulse in the secondary winding thereof.
  • the transistor 36 remains non-conductive until the charge on the capacitor 34 reaches the point where the base emitter junction of the transistor 36 once again is forward biased. At this time the transistor 36 commences conduction and the conduction holding potential through the resistor 52 to the base of the transistor 26 is removed. Once again the transistors 38, 42 and 15 attain the original state, which has been described, with the transistor 15 being rendered conductive to start the flow of current through the primary winding ofthe ignition coil 14. It should be noted that depending upon the ratio selected between the currents supplied by the current source resistors 27 and 47, the time in the positive half cycle of the waveform 17 at which the transistor 36 is rendered conductive can be varied.
  • the time base for charging the capacitor 34 through each of these resistors can be controlled.
  • the size of the capacitor 34 is selected so that it does not become fully charged by the current from the current source 27 during the negative half cycle of the waveform 17.
  • the current of the current source resistor 47 is selected to be greater than the current supplied by the current source resistor 27 so that discharge of the capacitor takes place in less than a half cycle of the waveform 17, and the selection of the value of the resistors 27 and 47 to establish the ratios of the currents supplied determines the percentage of time that the transistor 36 is turned off for each complete cycle of the waveform 17.
  • the charging time on the negative half cycles of the waveform 17 of the capacitor 34 is less than at lower speeds so that the charge reached by the capacitor 34 prior to the time that the transistor 26 is rendered conductive is less for high speed operation than for low speed operation.
  • This lower threshold at which the circuit switches from a constant dwell type of operation to a constant off operation may be selected to be at any engine speed desired, and a preferable speed has been determined to be below 400 rpm so that this is in the starting rpm range only.
  • Zener diode 50 is connected between the voltage supply lead 30 and ground.
  • Another Zener diode 51 is coupled between ground and a resistor 53 connected to the ignition switch 11 and from which collector potentials for the Darlington driver transistor 42 is obtained.
  • the Zener diode 51 provides protection for the drive circuit of the Darlington transistor 42 from transients generated in the load.
  • a pair of series connected Zener diodes, 56 and 57. are coupled between the lower ends of the primary winding of the coil 14 and ground provides protection for the.
  • the diode 61 provides protection for the Zener diode 60 from high forward currents during starting with a reverse battery protection.
  • ballast resistor 12 presents an undesirable high impedance during starting, there is shown a provision including a start switch 65 and a relay 66, 67 for shunting the ballast resistor during operation of the starter 69.
  • drive current for the Darlington amplifier 42 is provided through a diode 70 from the starter switch 65 when the ignition key is in the start position. This provides a low resistance path for low voltage operation, and allows additional resistance to be insertedin the drive circuit to reduce drive power dissipation during higher voltage normal run conditions of the circuit.
  • the operating current supplied to the collectors of the Darlington transistor 42 is supplied through the resistor 53 when the start switch 55 is opened.
  • a resistor 72 provides a load on the starter relay coil 66 to reduce voltage stress on the diode 70 during the starting operation.
  • the following values for the listed circuit components were used to provide a constant dwell on or charging time of the primary winding of the ignition coil 14 to of time of 70 percent.
  • the listing of these values is for information only and is not meant to limit the scope of the invention in any manner.
  • An electronic ignition system for alternately charging and collapsing the field in an ignition coil to produce a spark for firing an internal combustion engine, including in combination, first switching circuit means having an input and an output and operable between an on and an off condition, with the output thereof coupled with the ignition coil for alternately charging and collapsing the field in the ignition coil, second switching circuit means having an input and an output and operable between an on and an off condition, control means connected to the input of said second switching circuit means and controlling the same between the on and off condition in direct relation to engine RPM, a capacitor having a first terminal connected with the output of said second switching circuit means and a second terminal connected with the input of said first switching circuit means, a first direct current source connected to one of said first and second terminals of said capacitor, a second direct current source connected to the other of said first and second terminals of said capacitor, said second switching circuit means being operated to one of said on and off conditions by said control means to charge said capacitor through said first direct current source to operate said first switching circuit means to one of said on and off conditions to
  • said first direct current source includes first resistor means connected between a direct current potential and the first terminal of said capacitor
  • said second direct current source includes second resistor means connected between a direct current potential and the second terminal of said capacitor, said first resistor means being greater in value than said second resistor means.
  • An electronic ignition system for charging and discharging an ignition coil to produce a spark to operate an internal combustion engine including in combination:
  • first resistor means connected between a direct current potential and the first electrode of said first semiconductor switching device;
  • pulsing means for producing pulses of first and second polarities at a frequency proportional to engine RPM coupled with the control electrode of said first semiconductor switching device for operating said second semiconductor switching device between an on and an off condition in response to respective pulses of opposite polarity from said pulsing means;
  • second semiconductor switching device having first, second and control electrodes and operable between an on and an off condition, with the first electrode thereof coupled with said circuit means for controlling the flow of current through the ignition coil;
  • second resistor means having a value of resistance less than that of said first resistance means connected between a direct current potential and the control electrode of said second semiconductor switching device;
  • charge storage means connected between the first whereby with said first semiconductor switching device biased to the off condition by said pulsing means, said charge storage means charges through said first resistor means to bias said second semiconductor switching device to the on condition to control said circuit means to charge the ignition coil, and with said first semiconductor switching device biased to the on condition by said pulsing means, said charge storage means discharges through said second resistor means to control said circuit means to produce an ignition spark, the resistance values of said first and second resistor means and the charge storage value of said charge storage means being selected such that at cranking speed of the engine, the low frequency of switching said first semiconductor switching device by said pulsing means permits said charge storage device to charge completely between each spark pulse, thereby providing a constant off time of the current through the ignition coil;
  • said resistance values of said first and second resistor means and the charge storage capacity of said charge storage means further being selected such that at engine RPM speeds above cranking speed, said charge storage means does not charge to full value and is discharged completely during each ignition spark produced by the coil; thereby insuring that the charging current through the coil is maintained in the on condition for a constant percent of the total period between spark pulses for such engine speeds above cranking speed.
  • said charge storage means is a capacitor and said first and second semiconductor switching devices comprise first and second transistors respectively, the collectors of which correspond to the first electrodes, the emitters of which correspond to the second electrodes and the bases of which correspond to the control electrodes, with the emitter electrodes of both of said first and second transistors being connected to a point of reference

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
US308125A 1972-11-20 1972-11-20 Constant dwell ignition system Expired - Lifetime US3871347A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US308125A US3871347A (en) 1972-11-20 1972-11-20 Constant dwell ignition system
SE7313571A SE396119B (sv) 1972-11-20 1973-10-05 Elektroniskt tendsystem for uppladdning och urladdning av en tendspole
GB4688673A GB1414888A (en) 1972-11-20 1973-10-08 Electronic ignition system
IT53228/73A IT994461B (it) 1972-11-20 1973-10-19 Perfezionamento nei sistemi di accensione per motori a scoppio
DE2357482A DE2357482C3 (de) 1972-11-20 1973-11-17 Elektronische Zündanlage für eine Brennkraftmaschine
JP48130647A JPS4981730A (de) 1972-11-20 1973-11-20
FR7341313A FR2207530A5 (de) 1972-11-20 1973-11-20
JP1979054273U JPS54147334U (de) 1972-11-20 1979-04-24

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US308125A US3871347A (en) 1972-11-20 1972-11-20 Constant dwell ignition system

Publications (1)

Publication Number Publication Date
US3871347A true US3871347A (en) 1975-03-18

Family

ID=23192657

Family Applications (1)

Application Number Title Priority Date Filing Date
US308125A Expired - Lifetime US3871347A (en) 1972-11-20 1972-11-20 Constant dwell ignition system

Country Status (7)

Country Link
US (1) US3871347A (de)
JP (2) JPS4981730A (de)
DE (1) DE2357482C3 (de)
FR (1) FR2207530A5 (de)
GB (1) GB1414888A (de)
IT (1) IT994461B (de)
SE (1) SE396119B (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4030469A (en) * 1974-12-12 1977-06-21 Ducellier & Cie Electronic ignition circuit
US4044733A (en) * 1974-04-30 1977-08-30 Hitachi, Ltd. Ignition apparatus for internal combustion engine
US4047513A (en) * 1975-11-17 1977-09-13 Solitron Devices, Inc. Ignition system with gas discharge tube circuit
US4106447A (en) * 1977-04-22 1978-08-15 General Motors Corporation Engine spark timing system with retard means and minimum burn timer
US4147145A (en) * 1975-06-21 1979-04-03 Volkswagenwerk Aktiengesellschaft Ignition coil current control circuit
US4625704A (en) * 1985-06-28 1986-12-02 Teledyne Industries, Inc. Electronic ignition system
EP2917560A1 (de) * 2012-10-19 2015-09-16 Eldor Corporation S.p.A. Plasmazündvorrichtung für verbrennungsmotoren

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2429431C2 (de) * 1974-06-19 1983-04-28 Robert Bosch Gmbh, 7000 Stuttgart Zündanlage für Brennkraftmaschinen
DE2452023C2 (de) * 1974-11-02 1982-12-02 Robert Bosch Gmbh, 7000 Stuttgart Zündanlage für Brennkraftmaschinen
JPS51126835U (de) * 1975-04-07 1976-10-14
JPS51162126U (de) * 1975-06-18 1976-12-23
DE2549586C3 (de) * 1975-11-05 1979-03-29 Robert Bosch Gmbh, 7000 Stuttgart Zündeinrichtung für Brennkraftmaschinen
JPS5316137A (en) * 1976-07-29 1978-02-14 Chikushiyou Ka Electronic ignition apparatus for gasoline internal combustion engine
JPS5472232U (de) * 1977-10-31 1979-05-23
DE10260321B4 (de) * 2002-12-20 2016-10-20 Volkswagen Ag Schaltungsanordnung zur Funkentstörung einer Kraftfahrzeugzündanlage

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3253163A (en) * 1963-12-20 1966-05-24 Gen Motors Corp Semiconductor internal combustion engine ignition system
US3357416A (en) * 1965-10-11 1967-12-12 Gen Motors Corp Transistorized ignition system having an integrating circuit
US3473061A (en) * 1966-08-27 1969-10-14 Bosch Gmbh Robert Ignition arrangements for internal combustion engines
US3559629A (en) * 1968-01-25 1971-02-02 Compteurs Comp D Static lead correction device for the ignition of an internal combustion engine
US3587551A (en) * 1968-10-29 1971-06-28 Solitron Devices Electronic iginition circuit
US3605713A (en) * 1970-05-18 1971-09-20 Gen Motors Corp Internal combustion engine ignition system
US3651793A (en) * 1969-02-12 1972-03-28 Bosch Gmbh Robert Arrangement for limiting the speed of internal combustion engines
US3776204A (en) * 1970-06-27 1973-12-04 Lucas Industries Ltd Speed limiting systems for internal combustion engines
US3791364A (en) * 1970-06-03 1974-02-12 Mitsubishi Electric Corp Ignition system for internal combustion engine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2244781C3 (de) * 1972-09-13 1979-03-22 Robert Bosch Gmbh, 7000 Stuttgart Zündanlage für Brennkraftmaschinen

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3253163A (en) * 1963-12-20 1966-05-24 Gen Motors Corp Semiconductor internal combustion engine ignition system
US3357416A (en) * 1965-10-11 1967-12-12 Gen Motors Corp Transistorized ignition system having an integrating circuit
US3473061A (en) * 1966-08-27 1969-10-14 Bosch Gmbh Robert Ignition arrangements for internal combustion engines
US3559629A (en) * 1968-01-25 1971-02-02 Compteurs Comp D Static lead correction device for the ignition of an internal combustion engine
US3587551A (en) * 1968-10-29 1971-06-28 Solitron Devices Electronic iginition circuit
US3651793A (en) * 1969-02-12 1972-03-28 Bosch Gmbh Robert Arrangement for limiting the speed of internal combustion engines
US3605713A (en) * 1970-05-18 1971-09-20 Gen Motors Corp Internal combustion engine ignition system
US3791364A (en) * 1970-06-03 1974-02-12 Mitsubishi Electric Corp Ignition system for internal combustion engine
US3776204A (en) * 1970-06-27 1973-12-04 Lucas Industries Ltd Speed limiting systems for internal combustion engines

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4044733A (en) * 1974-04-30 1977-08-30 Hitachi, Ltd. Ignition apparatus for internal combustion engine
US4030469A (en) * 1974-12-12 1977-06-21 Ducellier & Cie Electronic ignition circuit
US4147145A (en) * 1975-06-21 1979-04-03 Volkswagenwerk Aktiengesellschaft Ignition coil current control circuit
US4047513A (en) * 1975-11-17 1977-09-13 Solitron Devices, Inc. Ignition system with gas discharge tube circuit
US4106447A (en) * 1977-04-22 1978-08-15 General Motors Corporation Engine spark timing system with retard means and minimum burn timer
US4625704A (en) * 1985-06-28 1986-12-02 Teledyne Industries, Inc. Electronic ignition system
EP2917560A1 (de) * 2012-10-19 2015-09-16 Eldor Corporation S.p.A. Plasmazündvorrichtung für verbrennungsmotoren
EP2917560B1 (de) * 2012-10-19 2022-12-07 Eldor Corporation S.p.A. Plasmazündvorrichtung für brennkraftmaschinen

Also Published As

Publication number Publication date
JPS54147334U (de) 1979-10-13
DE2357482A1 (de) 1974-06-12
IT994461B (it) 1975-10-20
JPS4981730A (de) 1974-08-07
DE2357482B2 (de) 1977-11-24
GB1414888A (en) 1975-11-19
DE2357482C3 (de) 1978-07-20
SE396119B (sv) 1977-09-05
FR2207530A5 (de) 1974-06-14

Similar Documents

Publication Publication Date Title
US3831571A (en) Variable dwell ignition system
US3871347A (en) Constant dwell ignition system
US3938490A (en) Internal combustion engine ignition system for generating a constant ignition coil control signal
US3575154A (en) Constant-energy ignition systems
US3131327A (en) Type ignition circuit condenser discharge
US3938491A (en) Switching circuit for ignition system
US4154205A (en) Capacitor ignition system for internal-combustion engines
US3791364A (en) Ignition system for internal combustion engine
US3087090A (en) Ignition system
US3418988A (en) Ignition system for internal combustion engines
US4275703A (en) Flux control system for a hall generator in an ignition system of an internal combustion engine
US3496921A (en) Capacitive storage ignition system
US3271593A (en) Internal combustion engine ignition system
US3874355A (en) Ignition device for internal combustion engine equipped with protective device
US4097770A (en) SCR trigger circuit
US3237620A (en) Semiconductor ignition system
US4329950A (en) Magneto ignition system with increased spark energy
JPS5938430B2 (ja) 内燃機関用点火装置
JPS6266265U (de)
US4100908A (en) Semiconductor ignition system for internal combustion engines
US3870028A (en) Ignition system for internal combustion engines
US4491122A (en) Anti-reverse operation of solid state inductive magneto
US4105006A (en) Ignition system for internal combustion engine
US3978838A (en) D-C power supply and ignition system
US4167170A (en) Turn-off protected ignition system for internal combustion engines