US3736463A - Electronic device for controlling a silicon controlled rectifier in a capacitor discharge electronic ignition circuit - Google Patents

Electronic device for controlling a silicon controlled rectifier in a capacitor discharge electronic ignition circuit Download PDF

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Publication number
US3736463A
US3736463A US00150466A US3736463DA US3736463A US 3736463 A US3736463 A US 3736463A US 00150466 A US00150466 A US 00150466A US 3736463D A US3736463D A US 3736463DA US 3736463 A US3736463 A US 3736463A
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United States
Prior art keywords
circuit
coupling
controlled rectifier
capacitor
multivibrator
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Expired - Lifetime
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US00150466A
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English (en)
Inventor
E Basso
G Gulino
A Veronese
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Marelli Europe SpA
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Magneti Marelli SpA
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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
    • F02P3/06—Other installations having capacitive energy storage
    • F02P3/08—Layout of circuits
    • F02P3/0876—Layout of circuits the storage capacitor being charged by means of an energy converter (DC-DC converter) or of an intermediate storage inductance
    • F02P3/0884—Closing the discharge circuit of the storage capacitor with semiconductor devices

Definitions

  • ABSTRACT A silicon controlled rectifier controls a capacitor discharge into an electronic ignition circuit for internal-combustion engines. Spurious signals are prevented from operating the controlled rectifier.
  • the battery voltage is constant during engine operation, but undergoes abrupt changes under high current drains and fluctuates due to inductances in the converter circuit supplying charging energy to the capacitor.
  • the present invention provides a novel circuit for controlling a silicon controlled rectifier, which is unaffected by unwanted transient signals, to assure efficient ignition timing.
  • the novel control circuit of the invention includes a monostable multivibrator, the output of which is coupled to the control electrode (or gate) of the controlled rectifier.
  • the input of the multivibrator is connected to a capacitive coupling circuit which receives a control signal from a clipping circuit which is, in turn, controlled by the breaker contacts. The entire circuit is then energized from the vehicles starting battery.
  • the capacitive coupling circuit connected to the multivibrator input serves to block unwanted signals from entering the multivibrator control circuits.
  • a memory circuit is connected to the emitter of an input transistor of the multivibrator to prevent operation of the multivibrator by signals unrelated to the closing of the timing contacts.
  • the circuit connecting operating voltage to the multivibrator includes an integrating circuit capable of supplying the multivibrator with a sufficiently high voltage at the proper ignition instant while permitting the existence of a lower voltage at other times.
  • FIG. 1 is a circuit diagram partly in block form of a capacitor discharge operated electronic ignition circuit provided with a silicon controlled rectifier for the capacitor discharge;
  • FIG. 2 is a diagram of the control circuit for controlling the silicon controlled rectifier according to the invention.
  • FIGS. 3, a tofshow voltage wave shapes, during an operation cycle, at certain points in the circuit of FIG. 2.
  • FIG. 1 there is shown a converter or a-c generator 1 which may be driven by the battery of the vehicle (not shown), a coupling transformer 2, a capacitor 3, a rectifier diode 4, an ignition coil 5 and a terminal 6 of the coil secondary winding which is connected directly to the ignition distributor (not shown). Normally, capacitor 3 is charged from converter 1 through diode 4.
  • FIG. 1 also shows a further diode 7 and a resistor 8, as well as a silicon controlled rectifier 20 controlled by the electronic control circuit 9 in accordance with the present invention.
  • Capacitor 3 is conventionally discharged through the primary winding of coil 5 when controlled rectifier 20 is fired. Hence the ignition takes place when the control circuit 9 supplies a triggering signal to the controlled rectifier 20.
  • the invention provides a novel control device capable of supplying said triggering signal only at each normal opening of the breaker contacts which conventionally provide ignition timing.
  • control circuit 9 includes a monostable multivibrator MVM having an output terminal G suitably coupled to the gate of controlled rectifier 20 and having its input and power supply terminals C and E, respectively, connected to circuits which protect against unwanted triggering of controlled rectifier 20 in accordance with the invention as described below.
  • MVM monostable multivibrator
  • the multivibrator MVM is of a conventional design and includes transistors T81 and T82, which have collector resistors R, and R respectively, and which are interconnected by resistor R capacitor C, and resistor R4-
  • the input circuit connected to the input terminal C of the multivibrator MVM comprises a clipping circuit SQ followed by a capacitive coupling circuit DA, to provide, in combination with the reactive network C,, R of MVM, a circuit for preventing unintentional operation of controlled rectifier 20 by transient pulses in the system.
  • the clipping circuit SQ includes a zener diode Z connected to positive battery terminal 21 of the vehicle and through a bias resistor R-,.
  • a diode D connects the point A and the anode of diode Z to ground through the vehicle breaker or points R which are connected to the battery terminal 21 by a resistor R,,.
  • the circuit DA is an asymmetrical differentiator comprised of capacitor C diode D having its cathode connected to terminal C, and a resistor R, which connects the common point B between capacitor C and diode D to ground.
  • the circuit connected to terminal D in FIG. 2 comprises a capacitor C and resistor R, which are parallel connected, and resistors R and R,, which connect the battery terminal 21 to the point D and the emitter of transistor TS l.
  • the circuit terminating at the multivibrator supply terminal E comprises an integrating circuit consisting of capacitor C, and a resistor R the latter being connected to battery terminal 21.
  • the output terminal G of the multivibrator is connected to the collector of transistor T82 and is connected to the silicon controlled rectifier 20 through a capacitor coupling network which, in the example shown, is also formed of an asymmetrical differentiator DA comprised of diode D capacitor C and resistors R R and R The common point F between resistors R and R is connected to the control electrode (or gate) of controlled rectifier 20..
  • FIGS. 3a to 3f show, respectively, the shape for voltages V V V V V and V at points A, B, C, D, E and F, respectively, of FIG. 2, during one operating (opening and closing) cycle of breaker R at a given rpm of the engine.
  • I is the time of opening for the contacts R and t is the time of closing of contacts R and t is the time of subsequent normal re-opening or beginning of the next cycle.
  • transistor T81 causes the switching-on of normally non-conducting transistor T82 through the resistor R so that a positive pulse will appear at multivibrator output terminal G.
  • the amplitude of this pulse depends on the battery voltage at terminal 21 and the forward voltage drop at diode D
  • This pulse is subsequently applied to point F, after passing through differentiator DA and appears at point F and the gate of silicon controlled rectifier 20, as the voltage V of FIG. 3f causing the controlled rectifier 20 to be triggered.
  • the triggering of controlled rectifier 20 causes discharge of capacitor 3 in FIG. 1 and hence the desired ignition.
  • the metastable state for the multivibrator MVM lasts for a short time, and lasts so long as the feedback control, formed by the network containing capacitor C and resistor R which may be construed as a varying current generator supplying base current to transistor T81, is sufficient to hold said multivibrator in its conductive state.
  • the feedback control formed by the network containing capacitor C and resistor R which may be construed as a varying current generator supplying base current to transistor T81, is sufficient to hold said multivibrator in its conductive state.
  • the voltage at point D begins exponentially to decrease from the voltage assumed on capacitor C during the conductive state of multivibra tor MVM, to the operating voltage according to a voltage division provided by resistors R R and R while the voltage at point E, which is determined by the charging of capacitor C exponentially increases during the interval t' -t (FIG. 3e) toward the full battery voltage.
  • circuits permit the energization for the multivibrator as a result of the opening of breaker contact R at time 1,, so that at this instant, the triggering signal for controlled rectifier 20 is available. at point G and hence at point F.
  • circuit operation is made independent of variations in the supply voltage.
  • the multivibrator cannot be made to conduct by transient pulses in the system appearing in the interval t,t which could provide improperly timed triggering of controlled rectifier 20.
  • the integrating circuit C -R connected to power supply terminal E of MVM assures the presence of a sufficient supply voltage for controlled rectifier triggering at time t independently of any fluctuations of the battery voltage about some nominal value.
  • the capacitor cou pling circuit connecting point G with point F assures a reverse bias for the control gate of controlled rectifier 20 to aid in its proper tum-off. From time t, this bias is developed as a result of the discharge of capacitor C which had been charged during the interval t -t' through resistors R R and R Since the coupling circuit DA is of the asymmetrical differentiator type (because of diode D,), the discharge current of capacitor C by passing through R also develops a positive voltage to reverse bias diode D Thus a triggering signal could not be issued from the monostable multivibrator output G for some time following t thereby to further insure against undesired ignition unrelated to the time of closing of points R.
  • the circuit of FIG. 2 provides protective circuits at all four points C, D, E and G of the multivibrator. It is apparent that in particular applications one or more of such circuits could be omitted. Moreover, the circuit could undergo modifications or changes according to specific requirements, without departing from the spirit of the invention. Moreover, the wave shapes shown in FIGS. 3a to 3f, and particularly those relating to the voltage at points B, C and D, could take a different shape, the protective function being however unchanged, particularly following time t
  • an electronic ignition control circuit for internal combustion engines; said internal combustion engines containing mechanically driven timing contact means operated between open and closed positions with a timing desired for the firing of spark plugs, and an ignition coil means; said electronic ignition control circuit including a discharge capacitor, a controlled rectifier having a pair of main terminals and a control electrode, a voltage source means, and means for charging said discharge capacitor from said voltage source means; said discharge capacitor, said pair of main terminals of said controlled rectifier and said ignition coil means being connected in series, whereby the firing of said controlled rectifier permits the discharge of said discharge capacitor into said ignition coil means; the improvement which comprises control circuit means connected to said control electrode of said controlled rectifier for firing said controlled rectifier only in response to the opening of said timing contact means; said control circuit means including a monostable multivibrator having an input circuit, and output circuit, and a power supply input circuit; first coupling circuit means for coupling said power supply input circuit to said voltage source means; second coupling circuit means including said timing contact means for coupling said input circuit to said power supply input circuit, where
  • said second coupling circuit means includes a clipping circuit constituted by a zener diode connected in parallel with said timing contact means.
  • said second coupling circuit means includes a clipping circuit constituted by a zener diode connected in parallel with said timing contact means.
  • said multivibrator includes an input transistor means; and circuit means including a capacitor coupling said output circuit to the base electrode of said input transistor means for positively cutting off said multivibrator following the conduction thereof in response to the opening of said timing contact means.

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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)
US00150466A 1970-06-05 1971-06-07 Electronic device for controlling a silicon controlled rectifier in a capacitor discharge electronic ignition circuit Expired - Lifetime US3736463A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT2554470 1970-06-05

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US3736463A true US3736463A (en) 1973-05-29

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US00150466A Expired - Lifetime US3736463A (en) 1970-06-05 1971-06-07 Electronic device for controlling a silicon controlled rectifier in a capacitor discharge electronic ignition circuit

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US (1) US3736463A (fr)
AT (1) AT319665B (fr)
BE (1) BE767998A (fr)
CH (1) CH534303A (fr)
DE (1) DE2125130A1 (fr)
ES (1) ES391935A1 (fr)
FR (1) FR2095801A5 (fr)
GB (1) GB1356195A (fr)
NL (1) NL7107637A (fr)
PL (1) PL70696B1 (fr)
SE (1) SE382242B (fr)
ZA (1) ZA713219B (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4077380A (en) * 1975-05-14 1978-03-07 Texaco Inc. Controlled-duration continuous-wave high-frequency ignition system
FR2418875A1 (fr) * 1978-03-03 1979-09-28 Texaco Development Corp Dispositif d'allumage pour moteur a combustion interne
US4494519A (en) * 1981-10-01 1985-01-22 Mitsubishi Denki Kabushiki Kaisha Ignition system for internal combustion engine
US4688538A (en) * 1984-12-31 1987-08-25 Combustion Electromagnetics, Inc. Rapid pulsed multiple pulse ignition and high efficiency power inverter with controlled output characteristics
US20090140791A1 (en) * 2007-11-29 2009-06-04 Young Paul D Switching Element Control

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3312860A (en) * 1963-09-27 1967-04-04 Straza Ind Condenser discharge using silicon controlled rectifier control means
US3383556A (en) * 1965-06-28 1968-05-14 Gen Motors Corp Capacitor discharge ignition system
US3472216A (en) * 1968-03-06 1969-10-14 Willis D Clyborne Engine ignition system
US3550571A (en) * 1967-12-01 1970-12-29 Lucas Industries Ltd Spark ignition systems for internal combustion engines
US3587552A (en) * 1967-11-30 1971-06-28 Compteurs Comp D Automatic advance electronic ignition device for internal combustion engines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3312860A (en) * 1963-09-27 1967-04-04 Straza Ind Condenser discharge using silicon controlled rectifier control means
US3383556A (en) * 1965-06-28 1968-05-14 Gen Motors Corp Capacitor discharge ignition system
US3587552A (en) * 1967-11-30 1971-06-28 Compteurs Comp D Automatic advance electronic ignition device for internal combustion engines
US3550571A (en) * 1967-12-01 1970-12-29 Lucas Industries Ltd Spark ignition systems for internal combustion engines
US3472216A (en) * 1968-03-06 1969-10-14 Willis D Clyborne Engine ignition system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4077380A (en) * 1975-05-14 1978-03-07 Texaco Inc. Controlled-duration continuous-wave high-frequency ignition system
FR2418875A1 (fr) * 1978-03-03 1979-09-28 Texaco Development Corp Dispositif d'allumage pour moteur a combustion interne
US4494519A (en) * 1981-10-01 1985-01-22 Mitsubishi Denki Kabushiki Kaisha Ignition system for internal combustion engine
US4561411A (en) * 1981-10-01 1985-12-31 Mitsubishi Denki Kabushiki Kaisha Ignition system for internal combustion engine
US4688538A (en) * 1984-12-31 1987-08-25 Combustion Electromagnetics, Inc. Rapid pulsed multiple pulse ignition and high efficiency power inverter with controlled output characteristics
US20090140791A1 (en) * 2007-11-29 2009-06-04 Young Paul D Switching Element Control

Also Published As

Publication number Publication date
PL70696B1 (fr) 1974-04-30
NL7107637A (fr) 1971-12-07
GB1356195A (en) 1974-06-12
ZA713219B (en) 1972-02-23
AT319665B (de) 1975-01-10
CH534303A (it) 1973-02-28
FR2095801A5 (fr) 1972-02-11
DE2125130A1 (de) 1971-12-23
SE382242B (sv) 1976-01-19
ES391935A1 (es) 1973-06-16
BE767998A (fr) 1971-11-03

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