초록 ▼

A knocking detection method for internal combustion engines in which vibrations of the engine are detected by a vibration sensor and a peak value of the vibrations during a predetermined interval near the top dead center in each revolution of the engine is sampled. The peak value for each revolution

A knocking detection method for internal combustion engines in which vibrations of the engine are detected by a vibration sensor and a peak value of the vibrations during a predetermined interval near the top dead center in each revolution of the engine is sampled. The peak value for each revolution is stored for a predetermined number of revolutions of the engine and an average value of the peak values is obtained. Then the ratio of each peak value to the average value is calculated, and the number of ratios whose magnitude exceeds a predetermined magnitude is expressed in terms of a rate or a percentage with respect to the total number of ratios, i.e., the predetermined number of revolutions of the engine. The presence or absence of the knocking is determined whether or not the rate or percentage is above a reference rate or percentage.

대표청구항 ▼

Apparatus for detecting engine knocking comprising: means for monitoring vibrations of an internal combustion engine during the rotation of said engine; means for sampling, during a predetermined interval close to the top dead center position of a piston of said engine, a peak magnitude of said moni

Apparatus for detecting engine knocking comprising: means for monitoring vibrations of an internal combustion engine during the rotation of said engine; means for sampling, during a predetermined interval close to the top dead center position of a piston of said engine, a peak magnitude of said monitored vibrations; means for counting a predetermined number of rotations of said engine; means for accumulating said sampled peak magnitude; for said predetermined number of rotations; means for dividing said accumulated peak magnitude by said predetermined number of rotations to derive an average peak magnitude of vibrations; means for dividing each of said sampled peak magnitude by said average peak magnitude to derive a magnitude ratio of each of said sampled peak magnitude relative to said average peak magnitude; means for comparing each of said magnitude ratio with a predetermined reference ratio to produce a comparison output indicative of said magnitude ratio being in excess of said predetermined reference ratio; means for counting a number of said comparison output; means for dividing said counter number of said comparison output by said predetermined number of rotations to derive an average counter number; and means for generating a knock signal indicative of the presence of knocking in said engine when said average counted number exceeds a predetermined value.