SYSTEMS AND METHODS TO DISTINGUISH ENGINE KNOCK FROM PISTON SLAP

A method (98) of distinguishing piston slap from engine knock in a reciprocating device includes obtaining (100) a fundamental frequency of a cylinder (26), the cylinder having a thrust face and an anti-thrust face, receiving (102) a first signal from a first knock sensor (32) mounted on the cylinder, and identifying (104) piston slap by evaluating whether a first plurality of amplitudes of the first signal at the fundamental frequency and one or more harmonic frequencies of the fundamental frequency exceed a piston slap threshold value.