CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE

• Main Author: HOJO AKIRA
• Format: Patent
• Language: English; Japanese
• Published: 20.02.2020
• Subjects: BLASTING; COMBUSTION ENGINES; CONTROLLING COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MECHANICAL ENGINEERING; WEAPONS

To provide a control device of an internal combustion engine which suppresses the lowering of exhaust emission performance resulting from the generation of wet fuel in a cylinder in a situation that in-cylinder pressure becomes negative pressure in an intake stroke before the opening of an intake valve.SOLUTION: An internal combustion engine 10 has a port injection valve 26, an in-cylinder injection valve 28, and an intake variable valve device 38 in which opening timing IVO is retarded rather than an exhaust top dead point and which can perform a valve drive mode in which intake/exhaust valves 34, 36 are closed in at least a part of a crank angle period from the exhaust top dead point up to the opening timing IVO. When a pressure difference ΔP (=Ps-Pc) in the opening timing IVO is equal to or larger than a threshold TH during a use of the valve drive mode, a control device 40 prohibits fuel injection by the port injection valve 26, and when the pressure difference ΔP in the opening timing IVO is smaller than the threshold TH, the control device permits the fuel injection by the port injection valve 26.SELECTED DRAWING: Figure 4 【課題】この発明は、内燃機関の制御装置に関し、吸気弁が開く前の吸気行程において筒内圧が負圧となる状況下において、気筒内にウェット燃料が生じることに起因する排気エミッション性能の低下を抑制できるようにする。【解決手段】ポート噴射弁２６と、筒内噴射弁２８と、開き時期ＩＶＯが排気上死点よりも遅角され、かつ、排気上死点から開き時期ＩＶＯまでのクランク角期間の少なくとも一部において吸排気弁３４、３６が閉じられるバルブ駆動モードを実行可能な吸気可変動弁装置３８とを備える内燃機関１０において、制御装置４０は、上記バルブ駆動モードの使用中に、開き時期ＩＶＯにおける差圧ΔＰ（＝Ｐｓ−Ｐｃ）が閾値ＴＨ以上である場合には、ポート噴射弁２６による燃料噴射を禁止し、開き時期ＩＶＯにおける差圧ΔＰが閾値ＴＨ未満である場合には、ポート噴射弁２６による燃料噴射を許可する。【選択図】図４