초록 ▼

An ignition timing control system for an internal combustion engine in which an angular position of the internal combustion engine is detected, and on the basis of the signal thus obtained by detection, the ignition timing of the internal combustion engine is determined by calculation in a computing

An ignition timing control system for an internal combustion engine in which an angular position of the internal combustion engine is detected, and on the basis of the signal thus obtained by detection, the ignition timing of the internal combustion engine is determined by calculation in a computing device. A knocking condition is judged by a detection signal produced from a knocking detector of the internal combustion engine, and the ignition timing is corrected by the judgement of knocking. In view of the fact that the knocking occurs only during a certain period of the driving cycle of the internal combustion engine, a knocking condition is judged by comparing a detection signal produced from the knocking detector during the time in the absence of knocking with a detection signal produced during the time in the presence of knocking.

대표청구항 ▼

An apparatus for controlling a timing of ignition sparks supplied to an internal combustion engine having an output shaft comprising: position detecting means for producing a reference position signal synchronized with the arrival of said output shaft at a predetermined reference position; computing

An apparatus for controlling a timing of ignition sparks supplied to an internal combustion engine having an output shaft comprising: position detecting means for producing a reference position signal synchronized with the arrival of said output shaft at a predetermined reference position; computing means for computing an ignition position relative to said reference position signal in response to operating conditions of said internal combustion engine, said computing means producing an ignition signal synchronized with the arrival of said output shaft at said ignition position; knock detecting means for producing knock signals having magnitudes proportional to respective intensities of knocks of said internal combustion engine; averaging means for averaging the magnitudes of said knock signals, interval control means responsive to said ignition signal for limiting the operation of said averaging means to a predetermined constant interval of time measured with respect to the occurrence of said ignition signal, said constant interval of time being independent of the angle of output shaft rotation made by the engine therein; comparing means for comparing the magnitudes of said knock signals with an average magnitude produced from said averaging means, said comparing means producing first and second outputs when the former is larger and smaller than the latter, respectively; and means for applying said first and second outputs to said computing means which responsively retards or advances, respectively said ignition position.