| 摘要 |
PROBLEM TO BE SOLVED: To provide an internal combustion engine capable of decreasing residual gas so as to prevent aggravation of combustion, occurrence of knocking, increase of fuel consumption and decrease of output and to preferably control the banks, by preventing adverse effect caused by exhaust pulsation generated in a communication passage for communicating exhaust passages of left and right banks. SOLUTION: In the V-type six cylinder engine, cylinder groups are provided in which a plurality of cylinders are arranged and divided into the left first bank 12 and the right second bank 13. An intake pipe 51, as well as a first exhaust pipe 57 and a second exhaust pipe 58, are connected to the cylinder groups of the banks 12, 13. A first upstream three-way catalyst 59 and a first control valve 64 are provided in the exhaust pipe 57 while a second upstream three-way catalyst 60 and a second control valve 65 are provided in the exhaust pipe 58. The exhaust pipes 57, 58 are communicated with each other on the upstream sides of the upstream three-way catalysts 59, 60 and the control valves 64, 65 by a communication pipe 63. A third control valve 66 for adjusting the flow rate of exhaust gas is provided in the communication pipe 63. COPYRIGHT: (C)2008,JPO&INPIT
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