Method for compensating a signal from a pressure measurement device within an internal combustion engine

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.

Description

technical field [0001] The present invention relates to the field of pressure measurement in cylinders of internal combustion engines, and more particularly to a device and a method for compensating for drift in the output signal of a pressure measurement sensor. Background technique [0002] Internal combustion engines conventionally comprise cylinders in which pistons slide, each cylinder defining a combustion chamber into which a fuel and an oxidant are introduced for combustion of the mixture. The engine converts the energy released by this combustion into mechanical energy. [0003] It is known that internal combustion engines are equipped with means for measuring the pressure prevailing in the combustion chambers of the cylinders, comprising pressure measuring sensors and associated electronics. [0004] This pressure value allows the electronic computing system (or ECU: "Engine Control Unit") installed on a motor vehicle equipped with this type of internal combustion...

AI Technical Summary

Problems solved by technology

[0014] ● Since each signal point is processed by complex calculations using a Kalman filter, this type of signal processing method is intractable and uses a large amount of ASIC circuit memory,

[0015] ● This method is difficult to calibrate because it includes four variables to be parameterized: one slope and constant gain for the fast Kalman filter and different slope gain and different constant gain for the slow Kalman filter,

[0016] ● At engine speeds below 1000 rpm, the processed signal resulting from this processing method is significantly distorted and thus difficult to use

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