CONTROL SYSTEM FOR INTERNAL COMBUSTION ENGINE

• Main Author: TAKAGI AKIHIRO
• Format: Patent
• Language: English; Japanese
• Published: 13.12.2023
• 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

To provide a control system for an internal combustion engine, which can properly detect a stoichiometric air-fuel ratio for current fuel according to a mixture ratio of diesel oil and biofuel to properly correct a control amount, without newly adding special sensors such as a fuel density sensor, a fuel oxygen concentration sensor, and a combustion pressure sensor to an existing internal combustion engine control system.SOLUTION: A control system for an internal combustion engine comprises: an inspection single-stage injection execution unit that can use light oil, biofuel, or a mixed fuel of light oil and biofuel, and performs an inspection single-stage injection of a predetermined amount of fuel during a deceleration fuel cut; a calculated air-fuel ratio acquisition unit for acquiring a calculated air-fuel ratio for a cylinder to which the inspection single-stage injection is executed; a λ acquisition unit for acquiring a value of λ during a fluctuation period due to the inspection single-stage injection; a stoichiometric air-fuel ratio acquisition unit for acquiring a stoichiometric air-fuel ratio of current fuel on the basis of the value of λ during the fluctuation period and the calculated air-fuel ratio; and a control correction unit for correcting a control amount for the internal combustion engine on the basis of the stoichiometric air-fuel ratio of current fuel.SELECTED DRAWING: Figure 5 【課題】既存の内燃機関の制御システムに燃料密度センサや燃料中酸素濃度センサや燃焼圧センサなどの特殊なセンサを新たに追加することなく、軽油とバイオ燃料の混合比に応じた現在の燃料の理論空燃比を適切に検出して制御量を適切に補正することができる、内燃機関の制御システムを提供する。【解決手段】軽油、バイオ燃料、軽油とバイオ燃料の混合燃料、を使用可能であり、減速燃料カット中に所定燃料量の検査用単段噴射を行う検査用単段噴射実行部と、検査用単段噴射を実行した気筒に対する算出空燃比を取得する算出空燃比取得部と、検査用単段噴射による変動期間のλの値を取得するλ取得部と、変動期間のλの値と算出空燃比に基づいて現在の燃料の理論空燃比を取得する理論空燃比取得部と、現在の燃料の理論空燃比に基づいて内燃機関の制御量を補正する制御補正部と、を有する。【選択図】図５