Intake and exhaust device for multi-cylinder engine

摘要

An intake and exhaust device for a multi-cylinder engine includes: a first intake and exhaust system corresponding to a first cylinder group and having an exhaust passage and an intake passage; a second intake and exhaust system corresponding to a second cylinder group and having an exhaust passage and an intake passage; a communication passage through which the exhaust passage of the first intake and exhaust system and the exhaust passage of the second intake and exhaust system communicate with each other; an adjusting valve for opening and closing the communication passage; an EGR unit for causing exhaust gas to circulate between the exhaust passage and the intake passage of the first intake and exhaust system and between the exhaust passage and the intake passage of the second intake and exhaust system respectively; and a control unit for controlling opening and closing of the adjusting valve and circulation of exhaust gas by the EGR unit based on an operating condition of the engine.