Ducellier & Cie

Ducellier Et Co.

Ducellier Et Cie

Louis Jean Chateau

An electronic ignition control device includes a voltage step up coil with its primary winding in series with an electronic contact breaker. The contact breaker is directly controlled by a first monostable circuit which is connected to be triggered by signals from an ignition signal generator. A comparator receiver a voltage signal from a coil current transducer and compares this with a fixed voltage level, producing a square wave of duration dependent on the excess of the voltage signal above the fixed voltage level. An integrator integrates the output of the comparator and provides a pulse duration control signal to the first monostable. A second monostable triggered by the generator also produces a square of predetermined duration. A current limiting circuit is connected to limit current in the primary winding. The first and second monostable circuits and the current limiting circuit all have their outputs connected to an OR gate which controls the primary current.

Ignition control device with monostable elements for providing a

A digital control device for an internal combustion engine ignition system includes a shaft angle digital encoder, a shaft speed digital encoder, a matrix memory addressed by the speed digital encoder and programmed to produce a digital output representing the required ignition angle for each speed value, a comparator connected to the angle encoder and the matrix to produce an output pulse when the digital signals therefrom coincide and means controlled by the angle encoder, the matrix memory device and the comparator for determining the shaft angles at which current flow through the ignition coil is initiated and terminated.

Automatic spark timing device

An electronic ignition control device employs two switch devices (e.g. mechanical contact breakers) operating at different instants to control initiation and interruption of current flow in the primary winding of the ignition coil. The coil current is controlled by an output transistor which is biased to conduct but which is switched off by an input transistor when a spark is required. The input transistor is controlled by the two switch devices so that opening of one switch device initiates primary current and opening of the other interrupts this primary current.

Electronic ignition control device for a motor vehicle

A depression sensor for an electronic ignition advance device for an internal combustion engine especially intended for use in a motor vehicle, the sensor being of the kind having a membrane which in use is deformable in response to the value of said depression, wherein the sensor comprises resistive means having an ohmic value which varies in accordance with the force applied to said means, and an electronic control circuit controlled by said resistive means so that variations in the value of said depression applied to the membrane will vary the force applied to the resistive means and consequently will vary an output voltage of said electronic control circuit.

Depression sensor for an electronic ignition advance device for an

A device for protecting an ignition device, particularly for motor vehicles, equipped with an internal combustion engine, in which a zener diode controls, by means of at least two transistors the placing in short-circuit of a resistor connected in series with the primary winding of an ignition coil and a control device in such a manner that when the supply voltage of the device exceeds a determined value, the resistor acts in series with the coil, which avoids damage to the ignition device.

Device for protecting an ignition device for motor vehicles

An electronic ignition circuit utilizing a magnetic pick-up winding has both ends of the pick-up winding connected by biasing resistor networks to the output terminal of the input stage of the circuit at which a positive going pulse appears when a negative going signal is induced in the pick-up winding. One end of the winding is connected by a diode to the base of a first transistor which controls a second transistor through a capacitor/resistor chain/diode series combination connected between the collector of the first transistor and said one end of the winding. The arrangement ensures that a spark can be produced even at low speed when a small signal is induced in the winding at the instant when ignition is required.

Electronic ignition circuit

An ignition distributor for use in an internal combustion engine, the distributor having in known manner a fixed contact and a movable contact wherein there is provided a support for the fixed contact having a housing which contains a nut threadably engaged with an adjustment screw whereby angular divergence is permitted between the screw and said support for the fixed contact when the screw is rotated.

Ignition distributor having contact adjustment mechanism

An electronic ignition control device for an internal combustion engine includes a power amplifier which controls current through an ignition coil and a triggering circuit for the power amplifier. To protect the power amplifier against damage resulting from being connected to a higher voltage source during starting there is a protection circuit which switches off the power amplifier when an over voltage is detected but allows it to switch on for a very short period when a spark is required. The protection circuit uses conventional logic elements, sensing the output of the triggering means, the output of a delay circuit driven by the triggering means, and the output of an over voltage sensing circuit.

Electronic ignition device for an internal combustion engine

An ignition system and a method of ignition for an internal combustion engine in which an element is rotated in association with a position detector to provide a reference signal varying in duration with engine speed. Impulses of constant frequency are produced by a generator and the impulses appearing during the duration of the reference signal are counted and coded. A further generator produces pulses as a function of induction depression and these are also counted and coded, and this coded value is corrected as a function of engine speed. The first coded value and the corrected coded value are compared and, when these coincide, an ignition spark is produced.

Growing community of inventors

Rosny-sur-Bois, France

Louis Jean Chateau