Electronic ignition control method and apparatus

摘要

An electronic ignition control apparatus for an engine comprises a reference signal generator to produce a reference signal corresponding to the top dead center position of a piston, a first sensor to produce a first output signal indicative of the amount of air sucked into a combustion chamber of the engine, a second sensor to produce a second output signal indicative of a predetermined period of time necessary for generating a spark voltage in an ignition coil, and a memory circuit to store a data indicating an optimum period of time for spark advance in relation to the amount of sucked air and responsive to the reference signal to produce a third output signal indicative of a period of time for spark advance relative to the first output signal, a calculation circuit responsive to the reference signal to calculate a timing to start energization of the primary winding of the ignition coil in the following cycle of the reference signal with respect to each period of time represented by the second and third output signals, and a setting circuit responsive to a timing signal indicative of a calculation-resultant value to maintain the energization of the primary winding of the ignition coil within the predetermined period of time.