Ignition system for internal combustion engine

摘要

An ignition system for controlling the distribution of ignition signals among a plurality of cylinders of a multi-cylinder internal combustion engine. An ignition timing signal and a BCD code signal obtained by counting (3) the cylinder discrimination signal generated at predetermined intervals of crank angle in accordance with the engine speed and a default signal produced at the time of a trouble with the ignition system are applied to a distribution ROM (5). The ROM, in turn, applies an ignition timing signal to each cylinder on the basis of stored data in accordance with the combination of these input signals. A fixed-position ignition is established at the time of a trouble.