ENGINE

• Main Authors: ASHIKAGA TAIGI, AIBA HIROKI
• Format: Patent
• Language: English; Japanese
• Published: 17.09.2020
• Subjects: BLASTING; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; CONTROLLING COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; MECHANICAL ENGINEERING; SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF; WEAPONS

To restrain destabilization of fuel injection.SOLUTION: An engine comprises a main fuel injection part for injecting main fuel to a combustion chamber, a liquid fuel injection part for injecting liquid fuel to the combustion chamber, and a fuel control part for changing an injection ratio of the main fuel and the liquid fuel according to an internal pressure of the combustion chamber. The fuel control part decreases the injection ratio of the main fuel when knocking is detected based on vibration of the internal pressure. Also, the fuel control part decreases the injection ratio of the main fuel, when an average effective pressure derived based on the internal pressure is less than a threshold. Also, the fuel control part is shifted to a two-kind injection mode for injecting the main fuel and the liquid fuel, when variation of an engine rotation number satisfies a predetermined stable condition, in one-kind injection mode for not injecting the main fuel and injecting the liquid fuel.SELECTED DRAWING: Figure 4 【課題】燃料噴射の不安定化を抑制する。【解決手段】エンジンは、燃焼室に主燃料を噴射する主燃料噴射部と、燃焼室に液体燃料を噴射する液体燃料噴射部と、燃焼室の内圧に応じ、主燃料と液体燃料との噴射比率を変更する燃料制御部と、を備える。前記燃料制御部は、前記内圧の振動に基づいてノッキングが検出されると、前記主燃料の噴射比率を下げる。また前記燃料制御部は、前記内圧に基づいて導出される平均有効圧が閾値未満であると、前記主燃料の噴射比率を下げる。また前記燃料制御部は、前記主燃料を噴射せず前記液体燃料を噴射する一種噴射モードで、エンジン回転数の変動が所定の安定条件を満たすと、前記主燃料と前記液体燃料を噴射する二種噴射モードに遷移する。【選択図】図４