Reconstruction of Indicated Pressure Waveform in a Spark-Ignition Engine From Block Vibration Measurements

[+] Author and Article Information
Piero Azzoni

ENEA, C.R.E. Ezio Clementel, via don Fiammelli 2, 40129, Bologna, Italy

J. Dyn. Sys., Meas., Control 119(4), 614-619 (Dec 01, 1997) (6 pages) doi:10.1115/1.2802369 History: Received May 13, 1994; Online December 03, 2007


Knowledge of the pressure waveform in each cylinder of a spark-ignition engine may provide useful diagnostic information concerning engine operation. This paper presents a method for the reconstruction of the indicated pressure waveform for each cylinder of a multicylinder internal combustion engine using engine block vibration signals. The method permits the reconstruction of the cylinder pressure waveform, cycle by cycle, during free accelerations. The procedure has good potential for application in end-of-assembly diagnostic tests, using a noncontacting laser velocimeter. The same signal processing method may be applicable on-board an automobile to perform an on-line cylinder-by-cylinder diagnostics, using the same vibration sensor used for knock detection in many production vehicles.

Copyright © 1997 by The American Society of Mechanical Engineers
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