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Method and apparatus for reconstructing in-cylinder pressure and correcting for signal decay

United States Patent

March 12, 2013
View the Complete Patent at the US Patent & Trademark Office
A method comprises steps for reconstructing in-cylinder pressure data from a vibration signal collected from a vibration sensor mounted on an engine component where it can generate a signal with a high signal-to-noise ratio, and correcting the vibration signal for errors introduced by vibration signal charge decay and sensor sensitivity. The correction factors are determined as a function of estimated motoring pressure and the measured vibration signal itself with each of these being associated with the same engine cycle. Accordingly, the method corrects for charge decay and changes in sensor sensitivity responsive to different engine conditions to allow greater accuracy in the reconstructed in-cylinder pressure data. An apparatus is also disclosed for practicing the disclosed method, comprising a vibration sensor, a data acquisition unit for receiving the vibration signal, a computer processing unit for processing the acquired signal and a controller for controlling the engine operation based on the reconstructed in-cylinder pressure.
Huang; Jian (Richmond, CA)
Westport Power Inc. (Vancouver, British Columbia, CA)
13/ 360,519
January 27, 2012
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH This invention was made with Government support under Contract No. DE-FC26-06NT42967 awarded by the United States Department of Energy. The Government has certain rights in the invention.