Contactless ignition system for internal combustion engine

Abstract

A contactless ignition system for the internal combustion engine comprises a first integrator for generating a triangular wave voltage V.sub.1 which rises at the minimum advance angle position and is held constant at the maximum advance angle position, a second integrator for generating a triangular wave voltage V.sub.2 which rises at the maximum advance angle position, a first comparator for generating an output signal in response to the coincidence between the first and second triangular wave voltages V.sub.1 and V.sub.2, a third integrator for generating a triangular wave voltage V.sub.3 which rises in response to an output signal generated from the first comparator, and a second comparator for generating an output signal in response to the coincidence between the first and third triangular wave voltages V.sub.1 and V.sub.3. An ignition signal is generated by the output of the second comparator. The change rate of the triangular wave voltage V.sub.2 is regulated in accordance with the engine operating condition, thus changing the advance angle width.