FUEL INJECTION DEVICE OF INTERNAL COMBUSTION ENGINE

PROBLEM TO BE SOLVED: To provide a fuel injection device of an internal combustion engine capable of suppressing soot in an exhaust gas during a cold operation, and securing high merchantability.SOLUTION: A fuel injection device 1 of an internal combustion engine directly injecting a fuel into a cylinder from a fuel injection valve 10, includes an ECU 2. A dimension ratio R as a ratio of an axial length L and a diameter D of an injection hole 11 of the fuel injection valve 10 is determined to a value of 1.0 or less. In the cold operation of the internal combustion engine, the ECU 2 controls the fuel injection valve 10 so that a fuel injection time Ti by the fuel injection valve 10 becomes a value to inject the fuel by an amount determined according to an operating state of the internal combustion engine, and the dimension ratio becomes a value within a soot rapid reduction region in which the soot in the exhaust gas is rapidly reduced in comparison with a case when the dimension ratio is over the value 1.0.SELECTED DRAWING: Figure 7 【課題】冷間運転時、排ガス中の煤を抑制でき、高い商品性を確保することができる内燃機関の燃料噴射装置を提供する。【解決手段】燃料を燃料噴射弁１０から気筒内に直接噴射する内燃機関の燃料噴射装置１はＥＣＵ２を備える。燃料噴射弁１０の噴孔１１における軸線方向の長さＬと直径Ｄとの比である寸法比Ｒが値１．０以下に設定されており、ＥＣＵ２は、内燃機関の冷間運転時、燃料噴射弁１０による燃料噴射時間Ｔｉが、内燃機関の運転状態に応じて決定される燃料量を噴射可能で、寸法比Ｒが値１．０を超えているときと比べて排ガス中の煤が急減する煤急減領域内の値になるように、燃料噴射弁１０を制御する。【選択図】図７