EXHAUST CIRCULATION DEVICE OF ENGINE

• Main Author: MATSUDAIRA NORIMITSU
• Format: Patent
• Language: English; Japanese
• Published: 22.12.2016
• Subjects: BLASTING; COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MECHANICAL ENGINEERING; SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF; WEAPONS

PROBLEM TO BE SOLVED: To provide an exhaust circulation device of an engine, which can efficiently remove soot deposited on an EGR cooler.SOLUTION: An exhaust circulation device of an engine has an EGR passage 30, an EGR cooler 34, an EGR valve 31, a bypass passage 37, and a bypass valve 38, and a control valve 80 for controlling a flow of exhaust gas is disposed at a position which is upstream of a connection point 37a where the bypass passage 37 is connected to an exhaust passage 20 and is downstream of a connection point 30a where the EGR passage 30 is connected to the exhaust passage. When selecting a DPF regeneration mode, an EGR cooler regeneration mode is previously executed for closing the EGR valve 31 and the control valve 80 and setting the bypass valve 38 at an intermediate opening to return exhaust gas from the EGR passage 30 to the exhaust passage 20 via the bypass passage 37.SELECTED DRAWING: Figure 6 【課題】ＥＧＲクーラに堆積する煤を効率的に除去することができるエンジンの排気循環装置を提供する。【解決手段】ＥＧＲ通路３０と、ＥＧＲクーラ３４と、ＥＧＲバルブ３１と、バイパス通路３７と、バイパスバルブ３８とを有し、排気の流れを制御する制御バルブ８０が、バイパス通路３７が排気通路２０に接続された接続点３７ａより上流でＥＧＲ通路３０が排気通路に接続された接続点３０ａより下流の位置に配置されている。ＤＰＦ再生モードの選択時に、ＥＧＲバルブ３１と制御バルブ８０を閉じ、バイパスバルブ３８を中間開度にして、排気をＥＧＲ通路３０からバイパス通路３７を経由して排気通路２０に戻すＥＧＲクーラ再生モードを先に実行する。【選択図】図６