Weber self single/even recognition and automatic combustion-rule empirical parameter calibration method

Abstract

The purpose of the present invention is to provide an automatic calibration method for empirical parameters of self-identifying single and double Weber combustion rules. The present invention judges the number of Weber equations to be selected according to the burnt fraction test data: when the number of Weber equations is 1, algebraic analysis is used to obtain the preliminary estimated value of the Weber parameter, and then the least square algorithm is used to obtain the final estimated value. When the number of Weber's equations is 2, the combustion phase separation point is obtained by using the combustion phase separation point determination method, and the burned fraction test data is divided into two parts according to the combustion phase separation point and processed accordingly. The preliminary estimated value of Weber parameter was obtained through analysis, and then the final estimated value was obtained by using the least squares algorithm. The invention can realize the self-identification of the number of Weber equations and automatically calibrate the parameters of the Weber equations, so that a zero-dimensional combustion model based on Weber's combustion rules can be quickly and accurately built, and the stability and optimality of the calibration results can be guaranteed.

Description

technical field [0001] The invention relates to a method for calibrating combustion parameters of an internal combustion engine. Background technique [0002] In order to solve the increasingly serious environmental pollution problem, the international emission regulations are becoming more and more stringent, restricting the harmful emissions of the engine, so that the manufacturers regard the emission control of the engine as particularly important. The emission characteristics of diesel engines are closely related to the combustion process in the cylinder, so realizing the real-time control of the combustion process is of great significance to the emission control of the engine. With the rapid development of computer technology, computer simulation technology has a vigorous vitality. Through the abstract imitation of the real system, the system model is abstracted, and people conduct simulation experiments on such models on the computer, which saves scientific research an...

AI Technical Summary

Problems solved by technology

Studies have shown that the single-Wiebe combustion rule is only suitable for the combustion process simulation of one combustion phase or two combustion phases with slight mixing, but it cannot achieve good simulation for the combustion process with obvious two combustion phases mixed

The double Weber (Wiebe) combustion rule can better simulate the combustion process of the two combustion phases mixed, but the calibration is difficult, so the selection of the number of single and double Wiebe equations needs to be a trade-off between calibration difficulty and accuracy compromise

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