An ignition system generates a spark or heats an electrode to a high temperature to ignite a .. while Lucas introduced a transistorized ignition in , which was used on BRM and Coventry Climax Formula One engines in 1 Sep A transistorized ignition system for switching the primary winding of an ignition coil of an internal combustion engine having the following. An electrical system for use with an ignition system of the type including an ignition coil and breaker points. The electrical system provides for low current through.

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The zener diode Z1 in series with the resistor R9 is connected between the commoned collector electrodes of the two power transistors and the base electrode of the power transistor P1.

Referring now to FIGS.

FTIS – Fully Transistorised Ignition System Explained

Turn the ignition switch to the ON position. Auxiliary power unit Coffman starter Hydraulic system Ice protection system Recoil start. Although an electrical supply is available, magneto systems are used mainly because of their higher reliability.

The voltage should read 12 volts.


The system of claim 1 wherein said coil is connected to said first output terminal of said second transistor and is adapted to be connected to a source of electric potential. Since the blades 72 cut the rays of infra-red at their convergent point, in the event of an area of the lens 13 of the gallium arsenide lamp 1 becoming obscured with dirt or oil, this does not syste, the exact time at which the radiation is cut off from the photo-transistor 2.

The system of claim 1 includIng a ballast resistor connected in series with said primary winding of said coil. Opening the points causes the current through the primary coil to stop.

Another object of the present invention is to provide an electrical system which is adapted for use in an electrical ignition system and in which a minimum sustem components are used providing a very reliable circuit.


Curves d and e show the induced primary voltage and current with the addition of the inductor L and the zener diode Z1. The timer core has equally spaced projections one for each cylinder of the engine and rotates inside a magnetic pickup assembly. A transistorized ignition transistoriaed according to claim 1, wherein the means for ensuring that the photo-transistor produces cleanly switched square-wave pulses is a diode connected across the emitter and collector electrodes thereof.

The capacitor 46 functions mainly as an AC shunt for transient signals or currents which may be picked up by the ignition system If the transformer has a On the second plate 38 is mounted, by means of two screws 56, a lens unit The simplest form of spark ignition is that using a magneto. The shaft is driven from its lower end 30 by an engine not shown to whose speed the speed of the shaft 24 is therefore proportional. This article needs additional citations for verification.

When the breaker points are connected to the transistor, as shown in figureit nearly eliminates arcing across them since the current flow is small about one-half ampere.

The purpose of the diode D1 is to prevent the voltage passed by the zener diode Z1 from flowing to earth via the transistor T3.

Negative going transients which occur when the power transistor P or darlington pair P1-P2 is turned off are taken care of by the diode D2 which conducts these thus preventing any break down thereof. Primary sensors on the system are crankshaft angle crankshaft or Top Dead Center TDC positionairflow transistorizfd the engine and throttle position. With an ohmmeter, check between the positive plus and negative minus terminals of the ignition coil.

On models with a coil mounted resistor, connect the ohmmeter leads to the end terminals of the resistor. They require regular adjustment to compensate for wear, and the opening of the contact breakers, which is responsible for spark timingis subject to mechanical variations. Install the new signal generator with the two mounting screws, do not completely tighten the screws until you have adjusted the air gap. A zener diode Z2 is connected in parallel with both these circuits in order to stabilize the voltage thereacross.


The car will run with the unit bypassed, if the points are good and there are no other obvious ignition problems. Notice that a magnetic pulse distributor, which resembles a conventional distributor, is used instead of a breaker-point type of distributor.

Another object of the present invention is to provide an improved transistorized ignition system which provides a relatively constant output voltage at the secondary winding of an ignition coil through a wide range of engine speeds. Capacitive discharge digital ignitions store charged energy for the spark in a capacitor within the module that can be released to the spark plug at virtually any time throughout the engine cycle via a control signal from the microprocessor.

The large diameter cylindrical portion 22 contains at its base a base plate 34, which is rigidly secured thereto by two screws Select either the 1 omega or 10 omega range on the ohmmeter.

Prest-O-Lite ‘s CD, which relied on capacitance discharge CDappeared inand had “an unprecedented 50, mile warranty.

FTIS – Fully Transistorised Ignition System Explained – CarBikeTech

Other engines may use a flame, or a heated tube, for ignition. Although an improvement over the basic system, despite the use of special contact breaker points they remained the most common cause of ignition faults in service on 6 and 8 cylinder engines. An ignition system generates a spark or heats an electrode to a high temperature to ignite a ignitiion mixture in spark ignition internal combustion enginesoil-fired and gas-fired boilersrocket enginesetc.