Systems and methods to distinguish engine knock from piston slap
AssigneeGeneral Electric Company
InventorJeffrey Jacob Bizub
Life of this patent
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Abstract
A method of distinguishing piston slap from engine knock in a reciprocating device includes obtaining a fundamental frequency of a cylinder, the cylinder having a thrust face and an anti-thrust face, receiving a first signal from a first knock sensor mounted on the cylinder, and identifying 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.
Claims17
A method of distinguishing engine knock from piston slap in a reciprocating device, comprising:
- obtaining a fundamental frequency of a cylinder, the cylinder comprising a thrust face and an anti-thrust face;
- receiving a first signal from a first knock sensor disposed on a cylinder;
- determining whether piston slap is present, by evaluating whether a 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;
- and
- determining whether engine knock is present, by evaluating whether the plurality of amplitudes do not decrease as the one or more harmonic frequencies increase.
A system, comprising:
- a controller configured to control a reciprocating device, wherein the controller comprises a processor configured to:
- obtain a fundamental frequency of a cylinder, the cylinder comprising a thrust face and an anti-thrust face;
- receive a first signal from a first knock sensor disposed on the cylinder;
- determine whether piston slap is present, by evaluating whether a 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;
- and
- determine whether engine knock is present, by evaluating whether the plurality of amplitudes do not decrease as the one or more harmonic frequencies increase.
A non-transitory computer readable medium comprising executable instructions that when executed cause a processor to:
- obtain a fundamental frequency of a cylinder, the cylinder comprising a thrust face and an anti-thrust face;
- receive a first signal from a first knock sensor disposed on the thrust face of the cylinder;
- determine whether piston slap is present, by evaluating whether a 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;
- and
- determine whether engine knock is present, by evaluating whether the plurality of amplitudes do not decrease as the one or more harmonic frequencies increase.
Dependencies are inferred from the claim text.