| 摘要 |
A method for correcting the drift of the signal from a sensor measuring the pressure in a cylinder of an internal combustion engine, the signal being comparable to a straight line of equation y=A×x+B, on which signal are overlaid pressure spikes, the correction method includes: I: using a rapid Kalman filter for detecting the points belonging to the pressure spikes, II: using a slow Kalman filter for determining of the slope (A) and of the constant (B), III: correcting, for each point, of the drift of the signal according to whether or not they belong to the detected pressure spikes determined during step I and the values of the slope and constant determined during the step II, wherin, during step I: the prediction error (epsR) on a point of the signal is estimated using the rapid Kalman filter, the standard deviation of this prediction error (eps sigma) is filtered and maximized, the start and/or end of a pressure spike at this point is determined according to at least one of the following two criteria: the prediction error (epsR) on this point is above a spike start threshold (delta1_up), the filtered and maximized standard deviation of the prediction error (eps sigma) on this point is above a spike start standard deviation threshold (eps_sigma_S1).
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