Ignition timing regulating apparatus

An internal combustion engine ignition timing regulating apparatus provided with a standard angle sensor for detecting a predetermined standard angle which is advanced ahead of a top dead center of a crank angle and in response generating standard angle signals, a memory means having stored therein optimum timing advance angle data corresponding to running conditions of the engine, the stored data being representative of signals displaced in time from and synchronized to timing of the standard angle signals, and a register means for deriving an ignition signal to be applied to an ignition device of the engine at a time corresponding to the read out time duration elapsing from a time of an immediately previously generated standard angle signal, said read out time duration corresponding to a speed of revolution determined in accordance with at least two standard angle signals generated prior to the immediately previously generated standard angle signal, the timing regulating apparatus comprising:

• a discriminator means for discriminating starting of an internal combustion engine, and
• a switching means for applying a substitute ignition signal to the ignition device at a fixed timing advance angle synchronized to the standard angle signal during starting of the engine discriminated by said discriminating means, said ignition device being energized a first time simultaneously with start of a starter motor, a second time after a fixed time duration following ignition, and thereafter synchronously with and at a time duration following said standard angle signal, said time duration depending upon instantaneous speed of revolution of said engine.