Abstract: The invention relates to an ignition device for combustion engines. The ignition device has a switching transistor (7) which, when a trigger is energized, is current-conductive, further an ignition coil (6), the primary winding (5) of which forms with the transistor (7) a series circuit, and, further, a signal transducer (10) connected in advance of the trigger (11) to supply a capacitor-charging current, after a lapse of a time period of its control signal (a, b) reaching a peak value. The threshold of the trigger (11) can be shifted relative to the control signal (a,b) by use of an electrical storage device (30) which can be charged and discharged, and in which the charge is dependent on the predetermined current value in the primary winding (5).

Abstract: An ignition system for an internal combustion engine is widely known which includes a primary current control switch circuit adapted to be turned off at an ignition position to interrupt flowing of a primary current through an ignition coil, to thereby induce a high voltage for ignition across the ignition coil. Continuation of the flow of the primary current causes an increase in power consumption and generation of heat from the ignition coil. An ignition system of the present invention utilizes charging and discharging of a control capacitor to permit control over the time for which the primary current is flowing to be accomplished with a simple structure. A discharge resistor which is arranged in parallel with the control capacitor carries out discharge of the control capacitor to interrupt the flow of the primary current when the internal combustion engine is stopped.

Abstract: An ignition device includes a capacitor 119, a semiconductor switch element 104 and an ignition control circuit 101, by which the cut-off of current supply to the ignition coil 105 is made gradual by supplying charge of the capacitor to the semiconductor switching element when the engine is stopped or the stop switch 117 is operated, the problems caused by undesired abrupt cut-off of the ignition current are eliminated.

Abstract: Reed valve mechanism for use in the fuel/air supply system of an internal combustion engine, the mechanism including passages, ports and reed valves, all of which are arranged to minimize unnecessary fluctuations of the flow velocity of the fuel/air being delivered to and into the cylinder of an engine and also minimize localized turbulence in the flow path and thereby increase the power output of the engine.

Abstract: An ignition circuit for an internal combustion engine includes an angle signal generating coil 1, an ignition control circuit 15, an ignition coil 16 and a bistable circuit connected between the angle signal generating coil and the ignition control circuit. The bistable circuit comprises a NPN transistor and a positive feedback circuit.

Abstract: This disclosure relates to apparatus for operating a combustion engine by controlling the spark ignition voltage to said engine. Said control is created by the application of two opposing currents to the input of an amplifying device which is used to selectively shunt a constant current source away from the control electrode of a second amplifying device connected to control the formation of said ignition voltage.

Abstract: A magneto ignition system includes a rotating magnet driven past a primary winding for firing the engine. The magneto generates a speed dependent signal having a following current pulse and a leading current pulse of a smaller amplitude than the following pulse. A Darlington power transistor has a collector connected in series with a voltage dropping resistor or diode to the winding. A resistor bias circuit connects the primary winding to the input of the power transistor. A cut-off transistor is connected to by-pass the bias circuit of the Darlington power transistor and thereby generate a pulse in the primary winding. A timing capacitor is connected to the primary winding in series with a diode and charging resistor. A control transistor has its input circuit connected between the timing capacitor and the resistors of the bias circuit.

Abstract: A circuit arrangement for generating high voltage pulses from DC voltage. The circuit includes a transformer comprising at least two primary windings and secondary windings, in which the primary windings are serial connected with at least one diode, a switching circuit and a voltage source. A first capacitor is connected in parallel with the first primary winding and diode, and in series with the secondary primary winding. The switching circuit is formed from the emitter-collector-section of a switching transistor. The output of a transistor amplifier is connected to the base of the switching transistor. The input of the transistor amplifier is coupled with the output of a control circuit. Two serial connected resistors are inserted between the input of the transistor amplifier and the output of the control circuit. The emitter-collector-section of a first transistor is connected to the common terminal of both the resistors. A voltage divider is connected to the base of the first transistor.

Abstract: This disclosure relates to apparatus for operating a combustion engine by controlling the spark ignition voltage to said engine. Said control is created by the application of two opposing currents to the input of an amplifying device which is used to selectively shunt a constant current source away from the control electrode of a second amplifying device connected to control the formation of said ignition voltage.

Abstract: An inductive ignition system for a spark ignited internal combustion engine. An N-channel field effect transistor (FET) is connected in series with the primary winding of an ignition coil. The primary winding and the FET are connected in a high side drive connection. An NPN transistor has its collector-emitter circuit connected between the gate and source of the FET. When the FET is biased off a flyback voltage is developed across the primary winding which is used to bias the NPN transistor conductive thereby clamping the gate and source voltage of the FET together to keep the FET switched off.

Abstract: In an ignition system for an internal combustion engine, on-off signals each responsive to one of a plurality of ignition signals from an engine control unit to switch on and off the primary current in an ignition coil are detected. A first trigger signal is produced from the logical sum of the detection signals and a second trigger signal is produced from the logical sum of the plurality of ignition signals from the engine control unit. A single nonretriggerable monostable multivibrator receives the first and second trigger signals to generate an engine ignition monitor signal.

Abstract: A magnetic ignition system with an ignition coil primary circuit having an ignition switch is controlled by a control switch to break at a given ignition time so that an ignition voltage is induced in the secondary circuit. A signal is delivered by a control circuit between the voltage supply and earth via resistors to a control switch at the ignition time. The control circuit serves the functions of voltage limiting and prevention of double spark (retriggering).

Abstract: A control circuit for an ignition system having a magnet generator provides an abrupt adjustment of the ignition time point toward an advanced ignition when a predetermined upper speed range of an engine is reached. The control circuit includes a frequency dependent R-C member coupled to a control switching transistor activated at a preset voltage level to trigger an ignition switching power transistor. The R-C member is preadjusted so as to be charged to the preset voltage level at the time point of the transition from a lower to the upper speed range.

Abstract: An electronic ignition system, for a four-stroke, four-cylinder engine, having:sensors that provide signals indicative of the running conditions of the engine,two ignition transformers, each having their respective output windings connected to the spark plugs of a respective pair of cylinders of the engine,means for monitoring the current flow in the respective input windings of the two transformers,switching means for selectively and alternately connecting output of a single integrated circuit to the input windings of the two transformers, and a micro-processor unit. The switching means has two electronically controlled switch devices, respectively in series with the input winding of the first and of the second ignition transformer, connected together in a current path in parallel.

Abstract: An ignition system for an internal combustion engine is disclosed which is adapted to carry out the comparison between an integrating voltage of a first integrating circuit and that of a second integrating circuit by means of a comparator to obtain advance characteristics. An ignition operation allowable interval detection signal generating circuit of the ignition system comprises a charge control transistor turned on when a first pulse signal is generated, a signal accumulating capacitor charged to a given voltage through the transistor, and a discharge control transistor for momentarily discharging the capacitor when a second pulse signal is generated. Such construction of the detection signal generating circuit allows the structure of the ignition system to be significantly simplified.

Abstract: A ignition module for an ignition system originally fitted with mechanical breaker points. The module comprising a drive winding adapted to be circumferentially received about one of the legs of a core for generating a first induced voltage signal in response to engine rotation. The module further comprising a control circuit extending from the drive winding and positioned between a core leg and an ignition coil.

Abstract: An ignition apparatus for internal combustion engines for preventing input noises out of an ignition signal line from affecting the ignition timing of the engine to make knocking or a start malfunction. A bistable circuit is provided for eliminating such input noises. The bistable circuit is associated with a Schmitt circuit which serves to energize or de-energize an ignition coil for inducing a discharging voltage. The Schmitt circuit is overridden by the bistable circuit for a time interval corresponding to a time for which such input noises exist. Afterwards, the Schmitt circuit receives as an input the ignition signal synchronizing with an engine speed and controls the ignition timing.

Abstract: Improved magnetic pulse timer components provide increased timer voltages with steeper bipolar waveforms. Such improvements are residual in terms of a permanently magnetized timer rotor (30, 40, 60, 70, 80). Rotors (30, 40, 60) have regularly spaced protrusions at the rotor's outer periphery and are permanently magnetized. Rotors (70, 80) have regularly spaced slots in their outer peripheries and may also be permanently magnetized. Such slotted rotors provide the capability of high level and steep bipolar voltage waveforms. Additional magnetic flux switching capability in the timer may be provided by utilizing a permanently magnetized component mounting base plate (90, 100, 110).

Abstract: An ignition system for a fuel burning engine has a transformer with a primary winding (L1) and a secondary winding (L2). A magnetic pulse time (20) provides a bipolar signal to the input circuits of a pair of transistors (Qa-Qb, Qn-Qp, Q2-Q3, Q4-Q5, Q6a-Q7) of opposite conductivities. The output circuits of such transistor pair are serially connected and also connected in series with ignition transformer primary winding. The transistor pair is simultaneously activated to provide current flow in the primary winding and simultaneously deactivated to discontinue such current flow to create an induced voltage in the primary winding that is transferred to the secondary winding to fire igniters of the engine. Transistor pairs of the multijunction, unijunction and field effect Darlington or non-Darlington types may be utilized.

Abstract: An ignition circuit for an internal combustion engine includes an ignition coil having a primary winding which is controlled by a power transistor. The lower transistor is controlled by either a first or a second control transistor. When the primary current flowing through the primary winding of the ignition coil is lower than a predetermined value, cut-off of the power transistor is controlled by the first control transistor. When the primary current is higher than the pre-determined value, cut-off of the power transistor is controlled by the second control transistor which becomes conductive prior to conduction of the first control transistor. Thus, two independent control means are alternately operated responsive to the primary current, which is a function of engine speed.

Abstract: A magnet rotating synchronously with an internal combustion engine magnetically couples periodically with a stator having primary and secondary windings to induce a voltage in the primary winding. A switching transistor is connected across the primary winding terminals. A voltage divider circuit is connected between one primary winding terminal and the transistor base for supplying base-emitter current when the primary voltage reaches a predetermined level, thereby turning the transistor switch on. The anode and gate of a programmable unijunction transistor (PUT) are connected to points in the divider to sense increasing base current and a corresponding increasing PUT anode-to-gate voltage. At a specific anode-gate voltage, the PUT conducts to short circuit the transistor switch base current, and turn the switch off. This causes the magnetic field in the stator to collapse and induce a high voltage in the secondary winding to fire the engine spark plug.

Abstract: An internal combustion engine ignition system includes an output switching transistor (7), the emitter-collector path of which is in series with the primary winding (5) of an ignition coil (6). To attain a constant amount of ignition energy in the ignition coil (6), the control current for the base of the output switching transistor (7) is supplied by a constant-current source (9), the level of the constant control current being selected such that while the ignition energy is being stored in the ignition coil (6), the saturated operation of the output switching transistor (7) is maintained.

Abstract: Solid state inductive magneto ignition system with antireverse running circuit has a switching transistor connected in circuit with the primary of an ignition coil. A control circuit is connected for cutting "off" the switching transistor to generate ignition pulses. A first by-pass circuit for shunting current from the control circuit includes a silicon controlled rectifier (SCR) which is turned "on" by discharge of voltage from a capacitor in combination with a resistor which serves as a time delay to hold the by-pass circuit "on" for the duration of a voltage pulse developed by reverse running of the magneto. A voltage polarity sensing circuit for by-passing the by-pass circuit in response to a forward running pulse includes a silicon controlled rectifier (SCR) connected in parallel with the first SCR and a choke coil and a resistor to cause the second SCR to be turned "on" by a first negative pulse developed during forward running of the magneto.

Abstract: An ignition timing control system for an internal combustion engine comprising a circuit for generating a reference ignition signal in synchronism with the engine, a circuit for generating a retard ignition signal at a point shifted by a selected shaft angle of the engine from the reference ignition signal, and an ignition circuit for controlling the ignition timing of the engine according to the retard ignition signal; said retard ignition signal generator includes a capacitor circuit for charging and discharging, a first constant-current circuit for always supplying a first current to the capacitor circuit, a second constant-current circuit for supplying a second current larger than the first current to said capacitor circuit, a switching circuit which starts flowing the second current in synchronism with the reference ignition signal and cuts off the second current when the terminal voltage across said capacitor circuit reaches a reference level, and an output circuit for generating a retard ignition signa

Abstract: An ignition system for internal combustion engines of the type in which after the energizing current flow to the primary winding of an ignition coil has been interrupted and an ignition spark generating high voltage has been produced in the secondary winding, the primary winding is energized again to interrupt the ignition spark. The ignition spark is interrupted at around the TDC only when the engine is at high speed operating conditions and the deenergizing current in the primary winding is not interrupted in a moment but decreased gradually. Also, the ignition spark is interrupted only when the ignition spark is to continue beyond the top dead center.

Abstract: An ignition system for the internal combustion engine comprising a high voltage circuit for generating a spark, having the primary and secondary windings. In response to a first signal, the current in the primary winding is cut off thereby to generate a high voltage at the secondary winding. In response to a subsequent second signal, the primary winding is shorted thereby to cut off the high voltage thus far generated in the secondary winding, thus properly regulating the duration of the spark generated.

Abstract: Breakerless ignition system of the inductive type is used to provide ignition pulses for an internal combustion engine which substantially duplicates the timing performance of a breaker-point magneto. The system utilizes a transistor for making and breaking the current flow in the primary coil of the ignition transformer. Switching of the transistor is controlled by a silicon controlled rectifier (SCR) and gating of the SCR is controlled by a time-delay network which includes a capacitor, resistor and a transistor switching means in circuit with the control electrode of the SCR. A second transistor and capacitor network controls the rate of rise of current to the time-delay network as a function of engine speed.

Abstract: To suppress negative half-waves derived from a magneto armature and not used for ignition without use of external damping networks, the semiconductor switch controlling current flow, and abrupt turn-off to initiate an ignition event, is formed as a monolithic semiconductor element, and the inherent inverse diode of the monolithic element is utilized to pass the reverse voltage half-waves. To prevent damage to the inherent diodes due to over-voltage or current overloading, a damping resistance element is connected in series with the main current carrying path of the monolithic circuit elements, preferably a Darlington transistor, which, preferably, is a semiconductor resistor having a preferred current passage characteristic in the same direction as the current flow through the Darlington transistor, for example a Zener diode, a resistor, or a series of diodes polarized like the inverse diode, bridged by a diode conducting in the same direction as the Darlington transistor, or the like.

Abstract: Oscillations which would normally occur when the current in the primary winding of an ignition coil is limited to a predetermined value prior to ignition are suppressed by use of a feedback resistor. Specifically, the basic circuit consists of the primary winding of the ignition coil connected in series with a Darlington transistor configuration which, in turn, is connected in series with a measuring resistor, at a common point. The input of the current control system is connected to the common point through an additional resistor, while the output of the control circuit is connected to the input base of the Darlington configuration. Oscillations which might otherwise occur are suppressed by the use of a feedback resistor connected between the input and output lines of the control circuit.

Abstract: A bipolar activated magnetic pulse timer (50, Q.sub.a, Q.sub.b) is shown for an ignition system (Q1, Q2, Qn, Qp, 80, 90, 40, 40a) of a fuel burning engine. Such system includes a pair of semiconductor switches (Q.sub.a, Q.sub.b) wherein the output circuits of such switches are serially connected. A magnetic pulse timer (50) having an output winding (53) is connected to the input circuits of such switches. Such switches and timer intermittently activate a variety of ignition circuits.

Abstract: A contactless ignition system for internal combustion engines of the type including an ignition coil with two primary windings whose primary currents are alternately switched on and off by two power transistors, further includes two Zener diodes each having a breakdown voltage of 300 to 400 volts and connected in series with one of the power transistors and one of the ignition coil primary windings to function as a reverse current blocking diode. By virtue of two series circuits each including the Zener diode, a diode connected in inverse parallel with one of the power transistors and the primary winding, each of the Zener diodes serves both the reverse current blocking function and the overvoltage protection function. The Zener diodes may be replaced with diodes of the avalance type.

Abstract: The primary winding of an ignition coil is placed in series with the collor of a switching transistor. In order to protect the transistor against overvoltages, the collector is also connected to a level comparator and the base receives a two-state control signal which is synchronous with the rotation of the engine. One input of the comparator is connected through a divider network to the collector of the transistor and the outer input is connected to a fixed direct-current voltage source. Provision is also made for an error amplifier connected to the output of the comparator, and for a summing circuit which is connected to the control input of the transistor and receives the control signal.

Abstract: An ignition system for a spark-ignition engine includes an ignition coil for applying a high voltage to each spark plug, a switch device connected in series with the secondary of the ignition coil for preventing in response to its conduction the supply of the high voltage to the spark plug, and a control circuit for turning on the switch device at a predetermined time after the generation of the high voltage, whereby the discharging at the spark plug is prevented under the combustion condition.

Abstract: The present invention relates to a contactless ignition circuit for internal combustion engines wherein a primary short-circuiting current flowing through the primary winding of an ignition coil is made to flow through a power transistor controlled to be conducted and interrupted by a programable unijunction transistor and a potential dividing type capacitor is connected to the anode electrode so as to operate this programable unijunction transistor when the wave height value of the primary short-circuiting current flowing through the above mentioned primary winding becomes maximum so that a spark plug connected to the secondary winding will be operated to ignite at a high sensitivity.

Abstract: In order to reduce the amount of ignition energy supplied to an ignition coil during low speed operation of the engine, an electronic circuit is provided to regulate the open time of the ignition circuit to be constant in an upper engine speed domain and to then obey a predetermined characteristic in the mid-range. The mid-range control is gradually made ineffective at lower engine speeds where the open ignition interval is determined by speed as measured by the duty cycle of the engine ignition transducer. The change of characteristics is obtained with the aid of a control voltage source which generates a speed dependent control voltage causing the discharge time of a capacitor to be extended at low engine speeds and causing the termination of the open time of the ignition to be determined by the transducer output signal.

Abstract: An ignition system that develops continuous-wave high-frequency spark signals. It employs a square wave oscillator which uses a unitary magnetic circuit and includes a control winding that acts to start and stop the oscillator. The control winding has a gate-turn-off type silicon controlled rectifier in circuit with it, which provides superior control action.

Abstract: To improve an ignition system as described in U.S. Pat. No. 4,176,645, Jundt et al., in which a threshold switch is provided which controls current flow through the ignition coil, the turn-ON point of the current flow being determined, in part, by an integrator, and to prevent malfunction due to corroded terminals, improper installation and the like, a variable resistance branch, including a transistor 66, is connected across the integrator 31, 44, and so connected that, as the supply voltage drops, the effect of the integrator 31, 44 on the threshold switch 15, 16 is decreased, thus preventing modification of the inherent threshold level of the threshold switch by the action of the integrator.

Abstract: An optoelectronic ignition device for an internal combustion engine requiring a single wire connection.A light-emitting diode, a photo-detector 2 and a first resistor 9 are energized in series, and a second resistor 3 is connected in parallel with the photodetector 2. The spark producing means 10, 11, 12, 13 is controlled by the signal which is taken from the terminals of the resistor 9.

Abstract: An apparatus for controlling an ignition coil of internal combustion engines including a power transistor connected to the primary winding of an ignition coil for controlling the energization and deenergization of the primary winding in response to a signal applied to the base of the power transistor. A feedback circuit, including a constant voltage diode, a capacitor and a resistor, is connected between the collector and base of the power transistor. When the power transistor becomes conductive from a nonconductive condition, a collector current of the power transistor flows through the capacitor and constant voltage diode due to the Miller integrator effect and the transition from nonconduction to conduction of the power transistor is made gradual thereby reducing a voltage generated in the secondary winding of the ignition coil.

Abstract: An ignition system having first and second modes of operation is part of an engine which develops motive power by burning fuel received in a main combustion chamber. An auxiliary combustion chamber that is integral with the main combustion chamber is provided. These chambers have a common passageway through which the auxiliary chamber receives a portion of the fuel. An electrical igniter is integral with the auxiliary chamber, the igniter having an electrically conductive base and an electrode insulated from such base. An ignition transformer is included that has a primary and secondary winding wherein the secondary winding is coupled to the electrode. A capacitorless excitation circuit is provided that is coupled to the primary winding for generating an electrical arc within the auxiliary chamber during the second mode of operation.

Abstract: A contactless ignition system for an internal combustion engine including an ignition signal generator having two pickup coils which are connected in series or parallel and oppositely in polarity to each other so as to be responsive to the rotation of a signal rotor in order to generate respective AC signals with one signal occurring at an intermediate position of the other, an input circuit disposed so as to be turned on or off when the AC signal from the ignition signal generator exceeds predetermined values in the positive and negative directions, respectively, an inverter circuit disposed to invert the output of the input circuit, first and second output circuits for generating a first output to turn on or off responsive to the output of the input circuit and a second output to turn off or on responsive to the output of the inverter circuit, and first and second ignition coils respectively responsive to the first and second outputs each so as to switch on and off the primary current therethrough.

Abstract: An ignition system includes an alternating current power source which feeds a transformer having a primary winding, the primary winding being coupled to an electronic switch. The electronic switch intermittently interrupts current flowing in the primary winding and in the output circuit of the power source. Such electronic switch is made operable by virtue of the peak excursions of the alternating current thus supplying the necessary collector or emitter potential, depending upon the manner in which the electronic switch is connected, for the entire igniter firing cycle. A capacitor in series with the output circuit of the power source and with the primary winding enables current to be transferred out of the power source to such primary winding. Such electronic switch also provides discrete separation between successive output waveforms of successive ignition firing cycles. The system employs a temporary change accumulator inductor in the output circuit in series with the primary winding.

Abstract: An improved ignition circuit for internal combustion engines is described herein, in which a diode is connected in parallel to a primary winding of an ignition coil of a magneto, and a composite transistor circuit consisting of two transistors whose forward direction is directed in the reverse direction of said diode, is connected across said primary winding at its collector and emitter, whereby overheating of said transistors caused by a primary reverse current of said magneto ignition coil flowing into the transistors can be prevented and also proper ignition timing can be maintained.

Abstract: An opto-electronic ignition system for an internal combustion engine in which radiation falls on to and is cut off from a photo-transistor in timed sequence with the engine, and in which between the photo-transistor and the primary winding of the ignition coil there is a plurality of switching Darlington pairs, each Darlington switching in inverse relation to its neighbor, and the first Darlington switching in inverse relation with the photo-transistor. The circuit is designed so that it will reliably operate in engine compartment temperatures above 125.degree. C.

Abstract: In an ignition system of an internal combustion engine the provision of a device for fast switching the primary circuit, this device including an infra-red radiation source and an infra-red radiation sensitive element, the radiation path being interrupted in timed relation to the engine revolutions whereby switching current is provided which is amplified for fast switching transistorized elements and applied to the primary winding of the ignition coil. Advance or retard of the ignition system can be achieved in relation to speed and/or load conditions on the engine by altering the line of sight between the radiation source and the radiation sensitive element in relation to a device which interrupts the radiation in timed relation to the engine revolutions.