NOX CONCENTRATION CONTROL SYSTEM FOR INTERNAL COMBUSTION ENGINE, INTERNAL COMBUSTION ENGINE AND NOX CONCENTRATION CONTROL METHOD FOR INTERNAL COMBUSTION ENGINE

• Main Authors: SATO JUNICHI, HANAMURA YOSHIFUMI, IMAHARA HIROAKI
• Format: Patent
• Language: English; Japanese
• Published: 22.06.2017
• 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 a NOx concentration control system for an internal combustion engine, the internal combustion engine and a NOx concentration control method for the internal combustion engine, which can calculate a NOx concentration while considering effects of humidity of the atmosphere, can improve calculation accuracy of the NOx concentration and thus can more appropriately control an operating state of the internal combustion engine by using a more accurate calculation value of the NOx concentration, so that the NOx concentration in exhaust gas of the internal combustion engine follows a target value.SOLUTION: Based on states of intake gas A+Ge and exhaust gas G relative to an engine 10, a calculation value Nc of a NOx concentration is calculated, and based on absolute humidity Ha of the atmosphere A sucked to an intake passage 12 of the engine 10, a humidity correction coefficient K is calculated. By using the calculated humidity correction coefficient K, control for correcting the calculated calculation value Nc of the NOx concentration is performed.SELECTED DRAWING: Figure 2 【課題】大気の湿度の影響を考慮してＮＯｘ濃度を算出することができ、ＮＯｘ濃度の算出精度を向上させることができ、これにより、より正確なＮＯｘ濃度の算出値を用いて、内燃機関の排気ガス中のＮＯｘ濃度が目標値に追従するよう内燃機関の運転状態をより適切に制御することができる内燃機関のＮＯｘ濃度制御システム、内燃機関、及び内燃機関のＮＯｘ濃度制御方法を提供する。【解決手段】エンジン１０に対する吸気ガスＡ＋Ｇｅ及び排気ガスＧの状態に基づいて、ＮＯｘ濃度の算出値Ｎｃを算出するとともに、エンジン１０の吸気通路１２に吸気される大気Ａの絶対湿度Ｈａに基づいて湿度補正係数Ｋを算出して、この算出した湿度補正係数Ｋを用いて、算出したＮＯｘ濃度の算出値Ｎｃを補正する制御を行う。【選択図】図２