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

• Main Authors: HANAMURA YOSHIFUMI, AOKI NOBUO
• Format: Patent
• Language: English; Japanese
• Published: 09.02.2017
• 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 of an internal combustion engine, an internal combustion engine and an EGR control method of an internal combustion engine, which can perform EGR while avoiding increase of a NOx emission amount without increasing a NOx concentration target value for suppressing smoke generation when the operation state of an engine is in a transient state.SOLUTION: A control device 30 is configured to, when the operation state of an engine 10 is in an acceleration state, execute at least one of delaying fuel injection timing tf of a cylinder fuel injection and reducing a fuel injection pressure Pcr in EGR control for suppressing the generation of smoke, without increasing a NOx concentration target value Nt1 set based on the operation state of the engine 10.SELECTED DRAWING: Figure 2 【課題】エンジンの運転状態が過渡状態でスモーク発生の抑制のためにＮＯｘ濃度目標値を大きくすることなく、ＮＯｘ排出量の増加を回避してＥＧＲをする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】制御装置３０が、エンジン１０の運転状態が加速状態にあるときは、スモークの発生を抑制するためのＥＧＲ制御で、エンジン１０の運転状態に基づいて設定されたＮＯｘ濃度目標値Ｎｔ１を増加させることなく、シリンダ内燃料噴射の燃料噴射時期ｔｆの遅延又は燃料噴射圧力Ｐｃｒの低下の少なくとも一方を行うように構成される。【選択図】図２