Measuring and testing – Vehicle chassis – Steering
Patent
1993-06-30
1995-02-28
Raevis, Robert
Measuring and testing
Vehicle chassis
Steering
G01M 1500
Patent
active
053926420
ABSTRACT:
Vibration sensors are used to monitor the resonant frequency of each cylinder of a multi-cylinder engine and the detection of an abnormal resonant frequency, i.e., one outside of an established range, is used as an indication that one or more specific cylinders is operating at an improper power level. Vibration signals associated with combustion in each cylinder can be used to perform FFT (Fast Fourier Transformation) with the combustion resonant frequencies for all engine cycles being determined and an averaged resonant frequency for each cylinder obtained. Shifts in the averaged resonant frequency or the detection of a zero resonant frequency for only one of the cylinders can be used as an indication that the cylinder with the shifted or zero resonant frequency is experiencing a low power condition, including misfiring.
REFERENCES:
patent: 3393557 (1968-07-01), Brown et al.
patent: 4083234 (1978-04-01), Aono et al.
patent: 4370884 (1983-02-01), Woss et al.
patent: 4586369 (1986-05-01), Vogler
patent: 4895121 (1990-06-01), McCoy et al.
patent: 5119783 (1992-06-01), Komurasaki
patent: 5144929 (1992-09-01), Hosoya et al.
Cummins Engine Company, Inc.
Raevis Robert
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