Measuring and testing – Vibration – Sensing apparatus
Patent
1996-09-16
1998-04-28
Williams, Hezron E.
Measuring and testing
Vibration
Sensing apparatus
73660, 731173, 7343103, 7343108, 7355101, G01H 1108, G01H 1300
Patent
active
057447225
ABSTRACT:
The present invention provides a system for detecting and removing resonance from crankshaft speed measurements comprising signal demodulation and deconvolution processing. According to the invention, a crankshaft speed sensor sends an appropriate signal corresponding to crankshaft speed to an engine controller. The input signal with resonance noise is subjected to a demodulation operation in N demodulation subsystems for resonance detection and identification. Also, the input signal with resonance noise is subjected to a deconvolution operation in N deconvolution subsystems for resonance noise removal. The demodulated signals are compared to a given set of criteria for selecting a desired signal subsystem. The desired demodulated signal subsystem is then used to screen the deconvolved signal so that only a matching deconvolved signal exits the system as the system output. Accordingly, the signal from a deconvolved signal subsystem matching the selected demodulated signal subsystem is selected as the system output. By properly identifying the desired signal subsystem during demodulation and suppressing resonance noise during deconvolution, the system output signal has an enhanced signal-to-noise ratio. Hence, the output signal is better suited for further processing, such as engine misfire detection, than according to the prior art.
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"Real Time Estimation of Engine Torque for the Detection of Engine Misfires" by Francis T. Connolly and Giorgio Rizzoni, Transactions of the ASME, Journal of Dynamic Systems, Measurement, and Control (Dec. 1994) vol. 116 pp. 675-686.
Fiaschetti John
Wu Zhijian James
Calcaterra Mark P.
Chrysler Corporation
Miller Rose M.
Williams Hezron E.
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