Method of and apparatus for controlling the ignition timing of an internal combustion engine

摘要

The ignition timing of an internal combustion engine is set to a fixed value if a predetermined signal is applied to a predetermined input terminal for servicing the ignition timing. However, if the engine is not in the idling condition, the ignition timing is controlled, as usual, depending upon the operating condition of the engine, even when the predetermined signal is applied to the service input terminal.