Abstract: 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.

Abstract: 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.