METHOD FOR COMPENSATING A SIGNAL FROM A PRESSURE MEASUREMENT DEVICE WITHIN AN INTERNAL COMBUSTION ENGINE
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United States of America Patent
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Apr 9, 2015
app pub date -
Sep 25, 2014
filing date -
Oct 8, 2013
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Abstract
A method for processing a signal (SB) from a pressure measurement device (DP) in a combustion chamber of a cylinder of an internal combustion engine includes: detecting the start of a plateau phase (SP1); calculating a pair of values of a slope (ax0, . . . , axN) and an intercept (bx0, . . . , bxN) of a straight line approximating the values of the signal acquired by the processing unit during the plateau phase; determining a voltage compensation value of the signal on the basis of each pair of calculated slope and intercept values; compensating the output signal (SB) of the pressure sensor on the basis of the determined voltage compensation value; detecting the start of a voltage peak phase (P2) following the plateau phase (SP1); and, during the detected peak phase, compensating the signal (SB) on the basis of the last pair of slope (axN) and intercept (bxN) values calculated during the plateau phase.
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