US3692009A - Ignition arrangements for internal combustion engines - Google Patents

Ignition arrangements for internal combustion engines Download PDF

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Publication number
US3692009A
US3692009A US74351A US3692009DA US3692009A US 3692009 A US3692009 A US 3692009A US 74351 A US74351 A US 74351A US 3692009D A US3692009D A US 3692009DA US 3692009 A US3692009 A US 3692009A
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Prior art keywords
transistor
direct current
current source
control
resistor
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US74351A
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English (en)
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Jorg Issler
Helmut Roth
Gerhard Sohner
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Robert Bosch GmbH
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Robert Bosch GmbH
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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

  • the ignition capacitor is connected to a DC to AC converter to be charged, and then discharged in synchronism with the desired firing of the spark plugs.
  • the ignition capacitor is discharged by rendering conductive a thyristor, which has a de-ionization period.
  • a timer consisting of a multivibrator, and an auxiliary switch prevent the DC to AC converter from charging for a period at least equal to the discharge period of the thyristor
  • the auxiliary switch can be a transistor that open circuits the conductive path to the control winding of the converter or a thyristor connected in series or in shunt with the secondary winding of the converter.
  • the ignition capacitor is connected to discharge through the secondary winding of the spark coil when a pulse operated, normally non-conductive, electronic switch, such as a thyristor, is made conductive in synchronism with the operation of the engine.
  • the spark coil secondary is connected to one or more spark plugs to fire the latter, and a pulse generator, operating in dependence on the engine, controls the electronic switch.
  • the sudden discharging of the ignition capacitor causes a voltage pulse with a steep wave front, so that even badly fouled spark plugs produce a hot spark.
  • the means for charging the ignition capacitor such as the DC to AC converter, continually charges the ignition capacitor, even when the latter is discharging. It has been observed that the de-ionization of the electronic switch for discharging the ignition capacitor is prevented, the electronic switch, which is commonly a thyristor, remaining continuously conductive and thereby preventing the generation of ignition pulses for the spark plugs.
  • An object of the invention is an arrangement for insuring de-ionization of the electronic switch for discharging the ignition capacitor.
  • the invention consists essentially of ignition capacitor means adapted to be charged and then discharged so as to produce an ignition causing spark, means for charging the ignition capacitor means, pulse operated, normally non-conductive, electronic switch means in circuit with the ignition capacitor means to permit discharge of the latter when conductive, said electronic switch means having a de-ionization period, pulse generator means for generating pulses in dependence on engine operation to render the electronic switch means conductive, and auxiliary switch means controlled by the pulses for preventing charging of the ignition capacitor means for at least the duration of the deionization period of the electronic switch means, whereby the latter can become non-conductive in the interval between the pulses.
  • FIG. 1 is a circuit diagram showing one embodiment of the invention.
  • FIGS. 2 and 3 are circuit diagrams showing two further embodiments of the invention.
  • an operating switch 11 connects the ignition arrangement to a direct current source 12, which can be, for example, the battery of a motor vehicle driven by an internal combustion engine, not shown.
  • a direct current source 12 which can be, for example, the battery of a motor vehicle driven by an internal combustion engine, not shown.
  • the current source 12 is shunted by a Zener diode 13, which is connected to be normally non-conductive.
  • the ignition arrangement comprises a DC to AC converter 15, which has a low voltage input with terminals 16 and 17, the converter being connected to the current source 12 when the switch 11 is closed.
  • a positive line 18 connects the input terminal 16 to the positive pole of the source 12, and a negative, or ground, line 19 connects the input terminal 17 to the negative pole of the source.
  • the high voltage output of the converter has terminals 20 and 21, the terminal 20 being connected by a lead 24 to one plate of an ignition capacitor 22.
  • the other plate of the ignition capacitor is connected by the primary winding 25 of the spark coil 26 and by the ground line 19 to the other output terminal 21.
  • the cathode of a charging diode 23 is connected to the output terminal 20.
  • the secondary winding 27 of the spark coil is connected to at least one spark plug 28.
  • an ignition distributor for connecting the secondary 27 to successive spark plugs of a series.
  • a pulse generator is operatively connected to the control electrode lead of the discharging switch 29.
  • the pulse generator operates in dependence on the operation of the internal combustion engine, and produces a triggering pulse whenever a spark plug 28 is to be sparked, which triggering pulse renders the switching path A-K of the switch 29 conductive.
  • the pulse generator 30 can operate photoelectrically or electromagnetically.
  • the pulse generator 30 comprises a conventional circuit interruptor 31, which is operated by a cam 32 driven by the internal combustion engine.
  • This control circuit has a control capacitor 33 and a control resistor 34 connected in series, the capacitor end 35 being connected to the ground line 19 and the resistor end 36 being connected by way of an emitter collector path 37, 38 of a PNP input transistor 39 to the positive line 18.
  • the common junction 40 between the control capacitor and control resistor is connected by the emitter collector path 41-42 of a PNP control transistor 43 to the control electrode S of the discharging switch 29.
  • the base 44 of the control transistor is connected by at least one diode 45 to the resistor end 36 of the series connected control capacitor and control resistor.
  • the polarity of the diode 45 permits current to flow only in a conductive direction for the control transistor 43.
  • a resistor 47 connects the base 46 of the input transistor 39 to the positive line 18, and a resistor 48 connects the base 46 to the ground line 19 by way of the circuit interruptor 31.
  • the resistor 47 is shunted by a non-conductively connected diode for protecting the base emitter path 46-37 of the input transistor 39 from excessive voltage.
  • the capacitor 50 s also shunting the resistor 47 prevents interference pulses from reaching the base emitter path 46-37.
  • a capacitor 51 shunts the base emitter path 44-41 of the control transistor 43 to prevent interference pulses from reaching this control path. Interference pulses are prevented from reaching the control path S-K of the discharging switch 29 by capacitor 52 shunted across this path.
  • the control electrode S of the discharging switch 29 is connected to the common junction between two series connected resistors 55 and 56 that are connected between the ground line 19 and the collector 42 of the control transistor 43.
  • the anode A of the discharge switch 29 is connected to the ground line 19 by a series connected capacitor 57 and resistor 58.
  • the anode A is also connected by a resistor 59 to the cathode of a diode 60 the anode of which is connected to the junction 40.
  • a resistor 61 which simplifies the setting of the voltage, is shunted across the series connected control capacitor 33 and control resistor 34.
  • a resistor 62 is connected between the positive line 18 and the junction 63 to which the resistor 48 is connected.
  • the Zener diode Z shunted across the control capacitor 33 limits the voltage to which the latter can be charged.
  • the DC to AC converter can be of known design, having either a single ended or push-pull output.
  • the converter has a single ended output.
  • the input of the converter 15 has a primary winding 64 and a control winding 65, and the output has a secondary winding 66, all of these windings being wound on a common iron core 67.
  • the primary winding 64 together with the emitter collector path 68-69 of the NPN switching transistor 70 forms a series circuit, one end of which is connected to the input terminal 16 and the other end of which is connected to the input terminal 17.
  • a lead 72 connects the base 71 of the switching transistor 70 to one end of the control winding 65, the other end of which latter is connected to the common junction 73 of two series connected resistors 74 and 75, which form a voltage divider between the positive line 18 and the ground line 19.
  • a non-conductively connected diode 76 connects the base 71 to the ground line 19.
  • a parallel connected capacitor 77 and a Zener diode 78 are shunted across the emitter collector path 68-69 to protect the latter against excessive voltage.
  • One end of the secondary winding 66 of the converter 15 is connected to the anode of the diode 23, and the other end is connected to the terminal 21 in the ground line 19.
  • the ignition arrangement thus far described operates in the following manner.
  • the DC to AC converter 15 begins to oscillate.
  • the lead 72 connects the base 71 of the switching transistor 70 directly to the control winding 65
  • the converter 15 oscillates continuously as long as the operating switch 11 is closed.
  • the frequency of the high voltage induced in the secondary winding 66 is appreciably higher than the frequency at which the spark plugs 28 are sparked.
  • the charging diode 23 insures that only the positive half waves of the AC high voltage are used, so that the plate of the ignition capacitor 22 connected to the lead 24 receives a positive potential and the plates connected to the ground line 19 are at negative potential.
  • the cam 32 opens the circuit interrupter 31, causing a positive potential to appear at the base 46 of the input transistor 39, thereby rendering non-conductive the emitter collector path 37-38 of this transistor.
  • the control capacitor 33 which has been previously charged while the emitter collector path 37-38 was conductive, can now discharge, whereby a current flows from the upper plate of the capacitor 33 through resistors 34 and 61 to the ground line 19.
  • the resulting voltage drop across the resistor 34 causes at the base 44 of the control transistor 43 a negative voltage that turns on the emitter collector path 41-42, so that the control capacitor 33 can now also discharge through this emitter collector path and the two resistors 55 and 56 connected in series.
  • the resulting voltage at the junction 53 of these two resistors constitutes for the control electrode S of the discharge switch 29 a triggering pulse that turns on the anode cathode path A-K.
  • the ignition capacitor 22 is now free to discharge through this anode cathode path and the primary winding 25 of the spark coil 26, thereby inducing in the secondary winding 27 a high voltage pulse that causes the plug 28 to produce an ignition spark.
  • the series connected capacitor 57 and resistor 58 conduct the negative halfwaves, which appear while the ignition capacitor 22 is discharging, to the anode A of the discharge switch 29, thereby encouraging deionization of the anode cathode path A-K.
  • the circuit interrupter 31 is again closed, and energy is again stored in the control capacitor 33 for starting the next sparking procedure.
  • Contact chatter of the circuit interruptor 31, causing the latter momentarily to reopen while closing, cannot cause the plug 28 to spark, because the control capacitor 33 has stored too little energy to produce a trigger pulse of sufficient peak amplitude to turn on the thyristor 29.
  • the ignition capacitor 22 is also charged during the sparking procedure. Consequently, it may occur at very high firing frequencies that the anode cathode path A-K of the discharge switch 29 does not de-ionize and thus remains continuously conductive. Therefore, no ignition sparks are produced.
  • the trigger pulse used to turn on the switching path A-K of the discharge switch 29 is also used to operate an electrically controlled auxiliary switch 79, which prevents the DC to AC converter from charging the ignition capacitor 22 at least for the de-ionization period of the thyristor 29.
  • the period of time that the trigger pulse switches the switching path of the auxiliary switch 79 is precisely determined by an electric timer 80, which is connected in the control connection 81 leading from the control electrode S of the discharge switch 29 to the auxiliary switch 79.
  • the electric timer can be, for example, an RC circuit or a time dependent differentiator. It can also be a Schmitt trigger, which as long as the trigger pulse at the control electrode S of the discharge switch 29 exceeds a predetermined level, switches the auxiliary switch 79.
  • Particularly suitable is a monostable mul tivibrator, shown in FIG. 1.
  • the monostable multivibrator comprises an npn input transistor 82 and an NPN output transistor 83.
  • the emitter 84 of the input transistor 82 is connected to the ground line 19; the collector 85 is connected by a resistor 86 and also by a series connected feedback capacitor 87 and a resistor 88 to the positive line 18; and the base 89 is connected by a control connection 81 -composed of a resistor 90 and a diode 91, which conducts only positive control pulses to the junction between the two resistors 55 and 56 and thus to the control electrode S of the discharge switch 29.
  • the emitter 92 of the output transistor 83 is connected by an emitter resistor 93 to the ground line 19; the base 94 is connected to the junction 95 between the feedback capacitor 87 and the resistor 88; and the collector 96 is connected by a resistor 97 to the positive line 18 and by a feedback resistor 98 to the base 89 of the input transistor 82.
  • the auxiliary switch 79 can be, for example, an electromagnetic relay or a semiconductor component.
  • the auxiliary switch can be connected either in the-low voltage input or in the high voltage output of the DC to AC converter 15.
  • the auxiliary switch 79 is an NPN transistor 99, of which the emitter collector path 100-101 forms the switching path. This switching path lies in the connection 72 between the base 71 of the switching transistor 70 and the control winding 65, the emitter 100 of the transistor 99 being connected to the base 71 of the switching transistor 70 and the collector 101 being connected to the control winding 65.
  • the emitter collector path 100-101 is protected in a known manner by a diode 102.
  • the base 103 of the transistor 99 is connected to the emitter 92 of the output transistor 83 of the multivibrator.
  • a trigger pulse appears at the control electrode S of the discharge switch 29, this pulse is conducted through the diode 91 and the resistor 90 to the base 89 of the multivibrator input transistor 82, thereby triggering the multivibrator to its unstable state.
  • the emitter collector path 84-85 of the input transistor 82 is conductive, whereas the emitter collector path 92-96 of the output transistor 83 is non-conductive.
  • the base 103 of transistor 99 therefore is not biassed, so that the emitter collector path 100-101 is n0n-conductive; and the control winding 65 of the converter 15 is not energized. Therefore, the converter 15 cannot charge the ignition capacitor 22 while the multivibrator is in its unstable state.
  • the charging time constant of the feedback capacitor 87 is chosen to be equal or somewhat longer than the de-ionization time of the particular kind of electronic discharge switch 29 used.
  • the described action is obtained if the transistor that composes the auxiliarly switch is so connected to one of the two control windings and to one of the two switching transistors as shown in FIG. 1.
  • the ignition arrangement shown differs from that shown in FIG. 1 in that the auxiliary switch 79 is composed by a thyristor 104 connected in the high voltage output of the converter 15.
  • the anode cathode path A-A' of the thyristor 104 is connected in series with the secondary winding 66, the anode A being connected to the ground line 19 and the cathode K to the secondary 66.
  • the cathode K is also connected to the ground line 19 by a lead 105 having at least one diode 106 of which the cathode is connected to the line 19.
  • the control electrode S of the thyristor 104 is connected to the emitter 92 of the output transistor 83 of the monostable multivibrator.
  • the lead 72 is connected directly between the base 71 of the switching transistor 70 and the control winding 75.
  • the embodiment shown in FIG. 2 is exactly the same as that shown in FIG. 1. Therefore, the circuit of FIG. 2 is shown and described only insofar as it differs in design and operation from that of FIG. 1. All components having the same function are denoted by the same reference numerals.
  • the circuit shown in FIG. 2 operates in the following manner.
  • the emitter collector path 92-96 of the multivibrator output transistor 83 is normally conductive during operation.
  • the resulting voltage drop across the emitter resistor 93 insures that the control electrode S of the thyristor 104 is biassed positive with respect to the cathode K.
  • Each of the positive charging pulses produced by the converter 15 is conducted by the auxiliary switch 79 to the ignition capacitor 22.
  • the emitter collector path 92-96 of the output transistor 83 is rendered nonconductive, and the positive bias across the emitter resistor 93 is no longer present, so that the auxiliary switch 79, formed by the thyristor 104, is non-conductive while the multivibrator is in its unstable state. Consequently, as long as the multivibrator is in its unstable state the ignition capacitor 22 is not charged, therefore preventing any hindrance of de-ionization of the discharge switch 29.
  • the diode 106 insures that no charging pulses can be conductive through the lead extending from the cathode A to the ground line 19.
  • the ignition arrangement shown in FIG. 3 also differs from that shown in FIG. 1 in that the auxiliary switch 79 is composed of a thyristor 107, which is connected in the high voltage output of the converter 15.
  • the anode cathode path A-K which is the switching path, is shunted across the secondary winding 66 of the converter 15, the anode cathode path A"-K” preferably being connected in series with a resistor108.
  • the cathode K" of the thyristor 107 is connected to the ground line 19
  • the anode A is connected by a resistor 108 with the anode of the charging diode 23
  • the control electrode S" is connected to the collector 110 of a PNP transistor 11 1 and by a resistor 109 to the ground line 19.
  • the emitter 1 12 of the transistor 111 is connected by a resistor 113 to the positive line 18, and the base 114 to the emitter 92 of the multivibrator output transistor 83.
  • the lead 72 connects the base 71 of the switching transistor 70 directly to the control winding 65.
  • the embodiment shown in FIG. 3 operates in the following manner.
  • the emitter collector path 92-96 of the multivibrator output transistor 83 is conductive during operation.
  • the emitter collector path 92-96 insures that the base 114 of transistor 111 is held at the same potential as the emitter 112. Consequently, the emitter collector path 112-1 of transistor 1 1 l is nonconductive. Therefore, the control electrode S of the thyristor 107 is not positively biassed, and the anode cathode path A"-K" is non-conductive.
  • the positive charging pulses from the converter 15 are free to charge the ignition capacitor 22..As soon as the trigger pulse appears at the control electrode S of the discharge switch 29 and the monostable multivibrator is triggered to its unstable state, the emitter collector path 92-96 of the output transistor 83 becoming non-conductive, the base 114 of transistor 111 is negatively biassed, so that the emitter'collector path 112-110 is rendered conductive, and a positive voltage appears at the control electrode S" of the thyristor 107. Consequently, the anode cathode path A"-K".
  • spark plug means for an internal combustion engine, in combination, spark plug means; ignition capacitor means adapted to be charged and then discharged so as to produce a single spark at said spark plug means for igniting a combustible mixture with said single spark; oscillator means connected to said capacitor means for applying charging pulses to said capacitor means; pulse-operated, normally non-conductive electronic switch means in circuit with said ignition capacitor means and operative to permit discharge of the latter when said electronic switch means is in conductive state, said electronic switch means having a deionization period; pulse generator means coupled to said engine and connected with said electronic switch means for generating control pulses and applying such pulses individually to said electronic switch means and each for the duration of a first time interval for thereby rendering said electronic switch means conductive, the frequency of generation of said control pulses being dependent on the operation of said engine; and auxiliary switch means connected with said oscillator means and with said pulse generator means and including electric timer means controlled by the respective control pulse for preventing charging of said ignition capacitor means for the duration of a second time interval subsequent to said first
  • said means for charging is a DC to AC converter having an input and an output, said input comprising at least one primary winding and at least one control winding and said output having a secondary winding; a common core for said windings; a switching transistor of which the emitter collector path is connected in series with said primary winding across said direct current; means connecting the base of said switching transistor to said control winding; and a charging diode connecting said secondary winding to said ignition capacitor means to form for the latter a charging current path composed of said secondary winding, charging diode, and ignition capacitor means.
  • auxiliary switching means comprises a switching path, and said switching path and said secondary winding are connected in series.
  • auxiliary switching means comprises a switching path, and said switching path is connected in shunt with said secondary winding.
  • said electronic switch means has a control electrode, said control electrode being connected to operate said auxiliary switch means; and further including a direct current source; an input and an output transistor comprised by said multivibrator, the emitter of said input transistor being connected to one pole of said direct current source; a resistor connecting the collector of said input transistor to the other pole of said direct current source; a feedback capacitor connecting the collector of said input transistor to the base of said output transistor; a resistor connecting the base of said output transistor to said other pole of said direct current source; a feedback resistor connecting the base of said input transistor to the collector of said output transistor; an emitter resistor connecting the emitter of said output transistor to said one pole of said direct current source, the collector of said output transistor being connected to said other pole of said direct current source.
  • auxiliary switch means is a transistor of which the emitter collector path forms a switching path.
  • auxiliary switch means comprises a switching path, said switching path being connected between the base of said switching transistor and said control winding.
  • auxiliary switch means is a thyristor and the cathode anode path thereof comprises said switching path.
  • ignition capacitor means adapted to be charged and then to be discharged so as to produce an ignition causing spark; means for charging said ignition capacitor means; pulse operated, normally non-conductive, electronic switch means in circuit with said ignition capacitor means to permit discharge of the latter when conductive, said electronic switch means having a de-ionization period; pulse generator means for control pulses in dependence on engine operation to render said electronic switch means conductive; auxiliary switch means controlled by said control pulses for preventing charging of said ignition capacitor means for at least the duration of said de-ionization period of said electronic switch means, whereby the latter can become non-conductive in the intervals between said control pulses; electrical timing means for determining the duration during which said auxiliary switch means prevents charging of said ignition capacitor means, said timing means being a monostable multivibrator, said electronic switch means having a control electrode, said control electrode being connected to operate said auxiliary switch means; a direct current source; an input and an output transistor comprised by said multivibrator, the emitter of
  • ignition capacitor means adapted to be charged and then to be discharged so as to produce an ignition causing spark; means for charging said ignition capacitor means; pulse operated, nor mally non-conductive, electronic switch means in circuit with said ignition capacitor means to permit discharge of the latter when conductive, said electronic switch means having a deionization period; pulse generator means for generating pulses in dependence on engine operation to render said electronic switch means conductive; auxiliary switch means controlled by said single control pulse for preventing charging of said ignition capacitor means for at least the duration of said de-ionization period of said electronic switch means, whereby the latter can become non-conductive in the intervals between said control pulses; electrical timing means for determining the duration during which said auxiliary switch means prevents charging of said ignition capacitor means, said timing means being a mono-stable multivibrator, said electronic switch means having a control electrode, said control electrode being connected to operate said auxiliary switch means; a direct current source; an input and an output transistor comprised by said multivibrator, the
  • ignition capacitor means adapted to be charged and then to be discharged so as to produce an ignition causing spark; means for charging said ignition capacitor means; pulse operated, normally non-conductive, electronic switch means in circuit with said ignition capacitor means to permit discharge of the latter when conductive, said electronic switch means having a de-ionization period; pulse generator means for generating pulses in dependence on engine operation to render said electronic switch means conductive; auxiliary switch means controlled by said pulses for preventing charging of said ignition capacitor means for at least the duration of said deionization period of said electronic switch means, whereby the latter can become non-conductive in the intervals between said pulses, said means for charging being a DC to AC converter having an input and an output, said input comprising at least one primary winding and at least one control winding and said output having a secondary winding; a common core for said winding; a switching transistor of which the emitter collector path is connected in series with said primary winding across said direct current source; means connecting the base of said switching transistor to said
  • ignition capacitor means adapted to be charged and then to be discharged so as to produce an ignition causing spark; means for charging said ignition capacitor means; pulse operated, normally non-conductive, electronic switch means in circuit with said ignition capacitor means to permit discharge of the latter when conductive, said electronic switch means having a de-ionization period; pulse generator means for generating pulses in dependence on engine operation to render said electric switch means conductive; auxiliary switch means controlled by said pulses for preventing charging of said ignition capacitor means for at least the duration of said deionization period of said electronic switch means,
  • said means for charging being a DC to AC converter having an input and an output, said output comprising at least one primary winding and at least one control winding and said output having a secondary winding; a common core for said windings; a switching transistor of which the emitter-collector path is connected in series with said primary winding across said direct cur rent source; means connecting the base of said switching transistor to said control winding; a charging diode connecting said secondary winding to said ignition capacitor means to form for the latter a charging current path composed of said secondary winding, charging diode, and ignition capacitor means, said auxiliary switching means com prising a switching path, and said switching path being connected in shunt with said secondary winding; monostable multivibrator timing means for determining the duration during which said auxiliary switching means prevents charging of said ignition capacitor means, and wherein said electrical switch means has a control electrode, said control electrode being connected to operate said auxiliary switch means; and further including a direct current source;
US74351A 1969-10-18 1970-09-22 Ignition arrangements for internal combustion engines Expired - Lifetime US3692009A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1952603A DE1952603C3 (de) 1969-10-18 1969-10-18 Zündeinrichtung für Brennkraftmaschinen

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US3692009A true US3692009A (en) 1972-09-19

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US74351A Expired - Lifetime US3692009A (en) 1969-10-18 1970-09-22 Ignition arrangements for internal combustion engines

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US (1) US3692009A (ja)
JP (1) JPS503456B1 (ja)
DE (1) DE1952603C3 (ja)
FR (1) FR2066079A5 (ja)
GB (1) GB1270489A (ja)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3838328A (en) * 1973-03-19 1974-09-24 W Lundy Capacitive discharge ignition system
US3857376A (en) * 1973-02-09 1974-12-31 Int Harvester Co Regulated ignition amplifier circuit
US3868937A (en) * 1972-12-20 1975-03-04 Colt Ind Operating Corp Ignition system with improved triggering circuit
US3903861A (en) * 1972-06-23 1975-09-09 Safe Electronic Systems Electronic circuit by which electric current is fed to spark plugs of an engine
US3918425A (en) * 1972-09-25 1975-11-11 Setco La Chaux De Fonds S A Electronic device serving to supply a load with constant voltage pulses
US4829971A (en) * 1985-10-28 1989-05-16 Minks Floyd M Regulated power supply for a solid state ignition system
SE2051548A1 (en) * 2020-12-22 2021-10-26 Sem Ab Electronic circuit and capacitor discharge system comprising electronic circuit

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3535365A1 (de) * 1985-10-03 1987-04-09 Gert Guenther Niggemeyer Hochspannungs-kondensator-zuendgeraet fuer brennkraftmaschinen
US5183024A (en) * 1990-10-04 1993-02-02 Mitsubishi Denki Kabushiki Kaisha Ignition device for internal combustion engine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3473061A (en) * 1966-08-27 1969-10-14 Bosch Gmbh Robert Ignition arrangements for internal combustion engines
US3487822A (en) * 1967-11-29 1970-01-06 Motorola Inc Capacitor discharge ignition system
US3489129A (en) * 1967-03-23 1970-01-13 Bosch Gmbh Robert Ignition arrangement for internal combustion engines
US3546528A (en) * 1968-01-24 1970-12-08 Rca Corp Capacitor discharge ignition circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3473061A (en) * 1966-08-27 1969-10-14 Bosch Gmbh Robert Ignition arrangements for internal combustion engines
US3489129A (en) * 1967-03-23 1970-01-13 Bosch Gmbh Robert Ignition arrangement for internal combustion engines
US3487822A (en) * 1967-11-29 1970-01-06 Motorola Inc Capacitor discharge ignition system
US3546528A (en) * 1968-01-24 1970-12-08 Rca Corp Capacitor discharge ignition circuit

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3903861A (en) * 1972-06-23 1975-09-09 Safe Electronic Systems Electronic circuit by which electric current is fed to spark plugs of an engine
US3918425A (en) * 1972-09-25 1975-11-11 Setco La Chaux De Fonds S A Electronic device serving to supply a load with constant voltage pulses
US3868937A (en) * 1972-12-20 1975-03-04 Colt Ind Operating Corp Ignition system with improved triggering circuit
US3857376A (en) * 1973-02-09 1974-12-31 Int Harvester Co Regulated ignition amplifier circuit
US3838328A (en) * 1973-03-19 1974-09-24 W Lundy Capacitive discharge ignition system
US4829971A (en) * 1985-10-28 1989-05-16 Minks Floyd M Regulated power supply for a solid state ignition system
SE2051548A1 (en) * 2020-12-22 2021-10-26 Sem Ab Electronic circuit and capacitor discharge system comprising electronic circuit
SE544004C2 (en) * 2020-12-22 2021-10-26 Sem Ab Electronic circuit and capacitor discharge system comprising electronic circuit

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Publication number Publication date
DE1952603C3 (de) 1978-09-28
GB1270489A (en) 1972-04-12
DE1952603A1 (de) 1971-04-29
JPS503456B1 (ja) 1975-02-05
FR2066079A5 (ja) 1971-08-06
DE1952603B2 (de) 1978-02-23

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