Patent ID: 7080635

Claim:
An intake and exhaust device for a multi-cylinder engine having a first cylinder group and a second cylinder group, comprising: a first intake and exhaust system corresponding to the first cylinder group and having an exhaust passage and an intake passage; a second intake and exhaust system corresponding to the 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 disposed in the communication passage and for being opened to establish communication between the exhaust passage of the first intake and exhaust system and the exhaust passage of the second intake and exhaust system and being closed to shut off gas flow between the exhaust passage of the first intake and exhaust system and the exhaust passage of the second intake and exhaust system; EGR means 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 control means for controlling opening and closing of the adjusting valve and circulation of exhaust gas by the EGR means based on an operating condition of the engine.