CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE MOUNTED WITH SUPERCHARGER AND CONTROL METHOD FOR THE SAME

• Main Authors: GOTO JUNJI, NOGUCHI MASARU
• Format: Patent
• Language: English; Japanese
• Published: 12.01.2017
• Subjects: BLASTING; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; MECHANICAL ENGINEERING; WEAPONS

PROBLEM TO BE SOLVED: To provide a control device for an internal combustion engine mounted with a supercharger capable of suppressing exhaust pressure in an exhaust passage to an upper limit value or less without impairing responsiveness or following capability of supercharging pressure.SOLUTION: A control device for an internal combustion engine mounted with a supercharger comprises: a target valve opening setting section (111) which sets target valve openings of exhaust flow regulation valves (321a, 321b and 322a) on the basis of an operation state of an internal combustion engine (2); a valve drive section (112) which drives the exhaust flow regulation valves (321a, 321b and 322a) so that actual valve openings thereof follow up the target valve openings; and a rotation speed determination section (120) which determines whether or not an increase rate of a rotation speed of the internal combustion engine (2) exceeds a threshold. When the increase rate of the rotation speed exceeds the threshold, the target valve opening setting section (111) sets the target valve openings of the exhaust flow regulation valves (321a, 321b and 322a) on the basis of the operation state of the internal combustion engine (2) by shifting a closing side limit value in a direction to open the valves.SELECTED DRAWING: Figure 2 【課題】過給圧の応答性ないし追従性を損なうことなく、排気経路の排気圧を上限値以下に抑制可能な過給機付き内燃機関の制御装置を提供する。【解決手段】内燃機関（２）の運転状態に基づいて、排気流量調整バルブ（３２１ａ、３２１ｂ、３２２ａ）の目標バルブ開度を設定する目標バルブ開度設定部（１１１）と、目標バルブ開度に排気流量調整バルブ（３２１ａ、３２１ｂ、３２２ａ）の実バルブ開度が追従するように、排気流量調整バルブ（３２１ａ、３２１ｂ、３２２ａ）を駆動させるバルブ駆動部（１１２）と、内燃機関（２）の回転数上昇速度が閾値を超えたか否かを判断する回転数判断部（１２０）と、を備え、目標バルブ開度設定部（１１１）は、回転数上昇速度が閾値を超えた場合には、閉方向限界値を開方向に変化させて、内燃機関（２）の運転状態に基づいて、排気流量調整バルブ（３２１ａ、３２１ｂ、３２２ａ）の目標バルブ開度を設定する。【選択図】図２