METHOD AND DEVICE FOR CONTROLLING INTERNAL COMBUSTION ENGINE

• Main Authors: OHASHI HITOSHI, SHIMOJO SHIGEMASA
• Format: Patent
• Language: English; Japanese
• Published: 17.05.2022
• 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 improve both of robustness of air-fuel ratio feedback control and exhaust performance.SOLUTION: An internal combustion engine 10 changes amplitude of a target air-fuel ratio with respect to a reference air-fuel ratio (e.g., a theoretical air-fuel ratio) in air-fuel ratio feedback control in accordance with an amount of evaporated fuel adsorbed on a canister 18 (an adsorption rate of the canister 18). That is, the amplitude of the target air-fuel ratio with respect to the reference air-fuel ratio in air-fuel ratio feedback control is set to be larger as the amount of the evaporated fuel adsorbed on the canister 18 (the adsorption rate of the canister 18) is larger. Accordingly, the internal combustion engine 10 can improve both of robustness in air-fuel ratio feedback control and exhaust performance.SELECTED DRAWING: Figure 1 【課題】空燃比フィードバック制御のロバスト性向上と排気性能向上との両立を図る。【解決手段】内燃機関１０は、キャニスタ１８に吸着した蒸発燃料量（キャニスタ１８の吸着割合）に応じて、空燃比フィードバック制御における基準空燃比（例えば理論空燃比）に対する目標空燃比の振り幅を変更する。すなわち、空燃比フィードバック制御における目標空燃比の基準空燃比に対する振り幅は、キャニスタ１８に吸着した蒸発燃料量（キャニスタ１８の吸着割合）が多くなるほど大きくなるよう設定する。これによって、内燃機関１０は、空燃比フィードバック制御におけるロバスト性向上と排気性能向上との両立を図ることができる。【選択図】図１