Abstract: An engine ignition control system includes a device adapted to receive the ignition timing signal which is generated by the engine original ignition pulse generator. The device derives a pulse sequence synchronous with the rotation of the engine from the original ignition timing signal. The device then generates a precision ignition signal from the synchronous sequence pulse at the optimum ignition angle. The precision ignition signal is supplied back to the original ignition system of the engine for the generation of the ignition sparks. The synchronous pulse sequence represents the angular position of the rotation of the engine in higher accuracy then the original ignition timing signal. In preferred embodiments, the synchronous pulse sequence represents the angular position of the engine up to 1 degree making high accuracy ignition advance control for most old engines that can produce only the ignition timing signal from its original ignition pulse generator possible.

Abstract: An engine security system includes a security device adapted to receive a sequence of timing pulses which is generated in dependence on the rotation of the engine. The device generates an ignition pulse sequence synchronous with rotation of the engine from the sequence of timing pulses on receipt of an enabling code. The ignition pulse sequence is supplied to the ignition system of the engine for the generation of ignition sparks. The pulses in the timing pulse sequence occur at different times from pulses in the ignition pulse sequence. In preferred embodiments, the sequence of timing pulses includes an identity code encoded therein.