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

• Main Authors: HANAWA TETSUSHI, SATO JUNICHI, ISHIZUKA SHINICHI, HANAMURA YOSHIFUMI, KAJIWARA ITSURO
• Format: Patent
• Language: English; Japanese
• Published: 14.12.2017
• Subjects: BLASTING; COMBUSTION ENGINES; CONTROLLING COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MECHANICAL ENGINEERING; SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF; WEAPONS

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 【課題】ＥＧＲ通路にＥＧＲバルブを有して構成されるＥＧＲシステムを備えた内燃機関で、内燃機関の運転状態に応じたＥＧＲバルブの開度を制御する場合に、このＥＧＲ制御に用いるＮＯｘ濃度を時々刻々算出するために、予め実験的に同定された幾つかの物理量(パラメータ)を用いてＮＯｘ濃度算出値を算出するＮＯｘ濃度モデルにおいて、モデル化の誤差を解消し、また、センサ群の経時変化にも対応できて、精度良いＮＯｘ濃度算出値を得て精度良いＥＧＲ制御を行うことができる内燃機関のＥＧＲ制御システム、内燃機関及び内燃機関のＥＧＲ制御方法を提供する。【解決手段】複数の物理量Ｃｄを用いてＮＯｘ濃度算出値Ｎｃを算出するＮＯｘ濃度モデル５０の最適化に多変数システムに対する最適化法で確率近似アルゴリズムを用いる同時摂動確率近似（ＳＰＳＡ）アルゴリズムを用いる。【選択図】図２