Cylinder pressure pegging method based on the least squares method with a varying polytropic coefficient

摘要

This invention relates to the use of the least square method based on the poly-tropic factor which changes the cylinder pressure compensation method, and more particularly, to a least square fit of the calibration method based on the cylinder pressure (pegging) with poly-tropic index improvement relative to the existing methods for the accurate measurement of the combustion pressure in the cylinder. ; For this purpose, The invention of the cylinder pressure is measured using a piezoelectric sensor, and given that much of the pressure compensation is required for the measurement of absolute pressure, and further conventional correction methods are vulnerable disadvantage in using a fixed poly-tropic factor or noise with poly tropic factor in the real world is gradually changed in a controlled environment and in view of the point measurement noise is present, the estimated index anisotropic poly (polytropic coefficient) which changes according to the engine operating conditions, and least square method (LSM: least squares method) by robust to noise on the basis of, intended to provide a more accurate combustion so that the absolute pressure can be measured based on a change to the least square method using the poly tropic index cylinder pressure correcting method.