EGR CONTROL SYSTEM FOR INTERNAL COMBUSTION ENGINE, INTERNAL COMBUSTION ENGINE, AND EGR CONTROL METHOD FOR INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To provide an EGR control system for an internal combustion engine, an internal combustion engine, and an EGR control method for the internal combustion engine capable of eliminating an error of a model formation and additionally adapting for a secular change of a sensor group, attaining NOx concentration values of high accuracy carrying out a high precise EGR control at a NOx concentration model for calculating NOx concentration values under application of several physical quantities (parameters) defined in advance experimentally in order to momentarily calculate NOx concentrations applied for the EGR control when an opening of an EGR valve corresponding to an operation state of the internal combustion engine with an EGR system constituted to have the EGR valve at an EGR passage is controlled.;SOLUTION: This invention uses a simultaneous perturbation probability approximation (SPSA) algorithm using a probability approximation algorithm at an optimization process for a multi-variable number system for optimization of an NOx concentration model 50 for calculating an NOx concentration value Nc under application of a plurality of physical quantities Cd.;SELECTED DRAWING: Figure 2;COPYRIGHT: (C)2018,JPO&INPIT