| 摘要 |
PURPOSE:To enlarge a range of operation in which supercharging effect brought by using dynamic effect led by intake pulsation, is generated, so as to raise the charging efficiency, by controlling the open/close of connecting routes each of which communicates each of plural intake routes to the lower face of a surge tank, respectively, for varying the constitution of the intake system. CONSTITUTION:Intake routes each of which is communicated to a cylinder of each of the first and the second banks 1A, 1B, respectively, are equipped with a surge tank 4 which is placed at the upper part between the cylinders. The first and the second intake pipes 5a, 5b which connect the surge tank 4 and intake ports 6a, 6b of the banks, with each other respectively, are formed with communicating routes 7a, 7b adapted to connect these pipes 5a, 5b to the lower faces of the first and the second surge tank chambers 4a, 4b, and opening/closing valves 71a, 71b are set in the communicating routes 7a, 7b, respectively. Then, these opening/closing valves 71a, 71b are opened to form intake routes whose intake pipes are different with each other in their length, and which communicate the cylinders to the surge tanks 4a, 4b, respectively. In this way, one intake route is made function as a resonating route, to enlarge a range of operation in which supercharging effect is generated.
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