Abstract: A capacitor discharge ignition system is provided with a control arrangement to prevent operation of an engine at excessive speeds. For example, when the engine exceeds a predetermined speed of operation, the control arrangement is effective to terminate the generation of the ignition firing pulses to the spark plug of the engine. The control arrangement includes a capacitor connected at one end to the cathode of an SCR switching device that controls the discharge of a charging capacitor into an ignition coil. The other end of the capacitor is connected in the triggering circuit of the SCR. The capacitor discharge ignition system is arranged to charge the charging capacitor during a first half cycle of operation of one polarity and subsequently to discharge the capacitor into the ignition coil by triggering the SCR during the following half cycle of operation of opposite polarity.

Abstract: An improved solid-state ignition system for a two-cycle internal combustion engine that increases scavenging and improves the smoothness of the engine during light load and low speed operation. A switch connected to the throttle valve is operative to enable a switching circuit at low throttle settings which in turn is adapted to inhibit in accordance with the firing order of the engine, the firing of each cylinder every other period so that the number of explosions is reduced by half while the intervals between explosions is maintained uniform. The switching circuit is connected to the control gates of the switching elements which control the flow of primary current to the ignition coil for each cylinder. When enabled, the switching circuit functions by periodically shorting the ignition signal applied to the gate of each switching element so that each switching element is responsive to only every second firing pulse produced by its respective sensing coil.

Abstract: A speed limiting system particularly suited for use with magneto ignition systems for small internal combustion engines is disclosed. In a first embodiment, shorting transistor (38) is made conductive for a predetermined time after a first trigger pulse from a trigger coil (12) thus preventing subsequent trigger pulses from being effective above a predetermined engine speed. A capacitor (44) is charged by a trigger pulse, and maintains shorting transistor (38) conductive until it is discharged through the shorting transistor (38), subsequent trigger pulses arriving while shorting transistor (38) is conductive recharging the capacitor (44). A diode (42), which also serves to prevent the capacitor (44) from discharging through the trigger coil (12), provides for normal ignition system operation by delaying operating of the shorting transistor (38) until a trigger pulse has become effective upon the gate (34) of a SCR (30).

Abstract: Ignition pulses derived from an engine ignition coil primary are fed to the input of an ignition interruption circuit that employs an integrated circuit timer. The state of the output terminal of the timer is governed by an RC time constant circuit and by trigger signals supplied by a trigger circuit in response to occurrence of each ignition pulse. The timer output is coupled to the gate of an SCR which when it receives gate current as a result of the timer output being in a high state becomes conductive and bypasses ignition pulses to ground to thereby lower engine rpm to a preset minimum in which case gate current is removed and at least enough ignition pulses are allowed to be unbypassed for keeping the engine running above stalling speed. The timer, in effect, compares the interval between pulses with its time constant.

Abstract: A device for the control of the traveling speed of a motor vehicle with a regulating unit actuatable by the vehicle driver, particularly a gas pedal, and means for transmission of the movement of the same to an element, particularly the throttle valve, which influences the fuel-air mixture. An electrical controller is provided, the desired value input of which is applied with the output signal of a first electrical position indicator, the latter being coupled with the regulating unit and the actual value input of which is applied with the output signal of a second electrical position indicator, the latter being coupled with the setting member or positioning actuator of an electrical setting or adjusting device, the actuator standing in connection with the element which influences the air-fuel mixture. Measures are provided which compensate for abnormal speed conditions of the device.

Abstract: Speed limiting in an ignition system utilizing a magneto generator is accomplished by increasing the damping of the half wave not utilized for ignition. This is accomplished by switching in additional resistance in parallel with the damping circuit resistance when the speed of the engine exceeds the speed to which it is to be limited. The additional damping during the half wave which is not utilized causes a decrease in the current and voltage wave utilized for ignition because of armature reaction. The decrease, in turn, causes a sudden change in ignition timing in the direction of late ignition and therefore an additional damping or complete suppression of ignition.

Abstract: A remotely controlled engine starter and protective system, particularly for engine driven vehicles, in which a remotely located radio transmitter is utilized to initiate energization of the starter motor; a first timer opens the starter circuit if the engine does not start in approximately ten seconds, and if the engine starts, a second timer is operative to stop the engine after approximately ten minutes.

Abstract: An ignition system for an internal combustion engine is provided with an ignition timing retarding circuit to prevent overrunning of the engine. The ignition timing retarding circuit includes a switching circuit connected to the gate of an ignition control thyristor and a predetermined duration signal generator for generating a signal having a predetermined duration from a predetermined reference time. During the time period in which the predetermined duration signal is applied to the switching circuit, the switching circuit is maintained conductive to thereby bypass an ignition signal generated in synchronism with the crankshaft rotation and applied to the gate of the ignition control thyristor.

Abstract: An ignition system of the capacitor discharge type and capable of preventing overrunning of an internal combustion engine includes a control circuit to render a switching transistor connected to a gate-cathode circuit of a main thyristor conductive for a predetermined period of time to interrupt a backward or reverse phase voltage generated by a magneto and serving as an ignition signal for the main thyristor from being applied thereto. The control circuit includes an integrator circuit connected in parallel with a constant voltage source to develop a voltage increasing with time and includes a voltage divider of the constant voltage source to provide a reference voltage. A transistor circuit of the control circuit compares the output voltage of the integrator circuit and the output voltage of the voltage divider and the transistor circuit maintains a control signal to be applied to the transistor circuit until the output of the integrator circuit reaches the reference voltage of the divider.

Abstract: A safety system for limiting the speed of a fuel powered engine, particularly an internal combustion engine of a vehicle or machine, preferably by controlling the engine ignition. The system is especially useful for vehicles such as snowmobiles, motorcycles, power boats, and the like. An alternating or pulsed electrical output directly proportional to engine rpm is detected and the rpm is limited to one of two or more different levels, depending upon the condition of a programming switch or switches, in this embodiment a throttle switch. An upper level limits engine speed to a safe rpm in the event of load removal, such as when a drive belt breaks or a gear change is missed. Engine speed is limited to a lower level if the throttle switch indicates idle rpm is desired and if the engine does not begin to decelerate from a higher rpm within a predetermined time, regardless of the actual throttle condition.

Abstract: A speed limiting system particularly suited for use with magneto ignition systems for small internal combustion engines is disclosed. A shorting transistor (38) is made conductive for a predetermined time after a first trigger pulse from a trigger coil (12), thus preventing subsequent trigger pulses from being effective above a predetermined engine speed. A capacitor (44) is charged by a trigger pulse, and maintains shorting transistor (38) conductive until it is discharged through the shorting transistor (38), subsequent trigger pulses arriving while shorting transistor (38) is conductive recharging the capacitor (44). A diode (42), which also serves to prevent the capacitor (44) from discharging through the trigger coil (12), provides for normal ignition system operation by delaying operating of the shorting transistor (38) until a trigger pulse has become effective upon the gate (34) of a SCR (30).

Abstract: A system to control operation of an IC engine, comprising, as a principal subsystem, a digital control system for executing computing processing by using inputs representative of parameters of engine operating conditions, including an engine speed signal, thereby producing a control signal to control at least one actuator which can regulate a factor of engine operation. The digital control system comprises means for examining the length of pulse intervals of the engine speed signal and discriminating means for forming a judgement that the engine is stalling when the pulse intervals continue to be longer than a predetermined length of time for a predetermined period of time, so that the system does not misjudge the presence of a noise signal to be an indication of engine stall.

Abstract: A device for the transmission of the position of a control element, particularly a gas pedal, (which control element is actuatable by the vehicle driver and controls the traveling speed of a motor vehicle, the gas pedal being connected with an electrical position encoder), to an actuator via electrical transmission means, the actuator being coupled with a regulating member, particularly a throttle valve, which member controls the fuel-air mixture of an internal combustion engine.

Abstract: A fuel injection system for a mixture-compressing spark-ignition internal combustion engine includes an air suction pipe, a throttle valve located in the pipe, and a member upstream of the throttle valve, which is actuatable by air flowing through the suction pipe so as to move a piston valve to dose a quantity of fuel to a fuel injection nozzle. The system includes a duct which bypasses the throttle valve, the duct having a valve which closes the duct when the throttle valve is closed and when the engine is above the idling speed. The duct valve is operatively connected to a switching member which switches off the ignition system of the engine.

Abstract: This invention relates to an ignition system for an internal combustion engine. The ignition system comprises an ignition circuit to generate a spark at an ignition plug in synchronism with a rotation of the internal combustion engine. The ignition circuit may be of a capacitor discharging type or of an ignition primary current interrupting type. The ignition system further comprises an ignition preventing circuit to prevent the ignition circuit from being operated when the internal combustion engine is rotated at a speed of revolution higher than a first set value of r.p.m. and when a throttle valve operating member is quickly returned to a position at which the r.p.m. of the engine is lower than the second set value of r.p.m. which is lower than the first set value of r.p.m. The ignition preventing circuit may be adapted to fully prevent the operation of the ignition circuit. Alternatively, the ignition preventing circuit may be adapted to thin the operation of the ignition circuit.

Abstract: A fail safe device for isolating the revolution limiter from the ignition system of an internal combustion engine, in which the output stage of the revolution limiter is continuously monitored to ascertain whether or not it is absorbing ignition pulses at a speed lower than the limiting speed. In the event that the absorption of ignition pulses is taking place at a speed lower than the limiting speed, the fail safe device becomes operative upon the engine revolutions falling below a given value and causes a fuse in series with the output stage of the revolution limiter to blow, thus isolating the revolution limiter from the ignition system to allow ignition to be instantly re-established in the event of a fault occuring in the revolution limiter.

Abstract: A breakerless magneto ignition system for an internal combustion engine, having an inherent speed limiting feature is disclosed. The ignition system includes an ignition coil with primary and secondary windings, a drive winding and a trigger winding. A first solid state switch is placed in circuit with the primary winding for controlling current flow through the primary winding, the drive winding controlling the solid state switch to render it conductive to allow current flow through the primary winding, and the trigger winding and an associated switching circuit subsequently shunting the input to the first solid state switch to render it nonconductive, to block current flow through the primary coil and induce an ignition spark voltage in the secondary winding. The primary winding, secondary winding and drive winding are mounted on the same magnetic frame adjacent a magnet-containing flywheel, and the trigger coil is mounted on the lower edge of the secondary winding in close proximity to the flywheel.

Abstract: A multi-function device using two ICs, with the precision ignition pulse frequency-to-voltage converted signal produced in the RPM portion being used as input to both ICs. Chatter pulses produced by an operational amplifier in the RPM limiter are utilized to shunt ignition pulses to ground in a proportional manner as engine speed approaches the selected maximum.

Abstract: An ignition system for an internal combustion engine, which includes circuitry for producing pulses at a frequency directly related to rotational speed of the engine and a capacitor discharge circuit. A first monostable circuit responsive to the pulses is arranged for triggering the capacitor discharge circuit by passing from its stable state to its unstable state. A second monostable circuit responsive to the pulses is arranged for triggering the capacitor discharge circuit when passing from its unstable state to its stable state. The time constant of the first monostable circuit is substantially equal to the frequency of the ignition system discharge corresponding to the maximum admissible speed of the engine. The time constant of the second monostable circuit being equal to a predetermined value equal to a value of retarded ignition allowing operation of the engine at a reduced power.

Abstract: A snowmobile is provided with an electrical control system for controlling the R.P.M. of the snowmobile engine. Forming part of the control system is a normally open, operator-presence sensing switch arranged in conjunction with a specially mounted throttle control lever such that the switch is closed anytime an operator's thumb is depressing the throttle control lever. The electrical control system is operative when the switch is open to maintain the engine R.P.M. at a value below that necessary for effecting engagement of a speed-responsive variable speed drive connecting an output shaft of the engine with a drive track of the snowmobile, and is operative when the switch is closed to maintain the engine R.P.M. at a value below that considered excessive for the engine and drive components.

Abstract: An internal combustion engine spark ignition system is provided which ensures that sparks are inhibited if the engine temperature exceeds a maximum safe level. The ignition circuit includes an input transistor which is switched on and off by an engine shaft transducer. The input transistor controls charging and discharging of a capacitor the voltage on which determines whether switching of the input transistor causes a spark to be produced via an output amplifier and ignition coil. A temperature sensing element determines both the rate at which the capacitor can charge and the final voltage to which it can be charged.

Abstract: The overspeed ignition system includes trigger means operative in timed relation to the speed of an internal combustion engine. A controlled switching means operates under the control of the trigger means to pass pulses of energy to a spark ignition unit. An overspeed cutout assembly is provided between the controlled switching means and the spark ignition unit to sense the time interval between the pulses of energy passed by the controlled switching means. When this time interval is less than an internal timed lockout interval determined by the overspeed cutout assembly, the cutout assembly blocks the pulses of energy to the spark ignition unit.The trigger means is formed by a trigger pulse generating assembly having a rotor of circular cross section symmetrically mounted for rotation relative to at least one trigger coil. The rotor is differentially magnetized to prevent pulses of energy from passing to the spark ignition unit when the engine rotates in a reverse direction.