| 摘要 |
<p>PURPOSE:To obtain supercharging effect by the inherent pulsation of suction air of respective cylinders themselves and improve the output of the engine by a method wherein the branched parts of respective suction paths are formed as surge tanks in the multi-cylinder engine having the suction paths for high and low loads respectively which are opened in respective cylinders. CONSTITUTION:A main suction path 2, for supplying suction air into respective cylinders 1A-1D of four-cylinder engine, is partitioned by a bulkhead 5 into low and high suction paths 6, 7 at the downstream of an airflow meter 4 while respective suction paths are branched respectively into four suction paths 6a- 6d, 7a-7d connected to respective ports 10a-10d, 11a-11d for low and high loads at the downstream of primary and secondary valves 8, 9. The branched parts of respective suction paths 6, 7 are formed as the surge tank 12 while the surge tank 12 is partitioned into two expanding chambers 14, 15 by a partitioning wall 13. The primary valve 8 is opened in accordance with the increase of load and is fully opened at a load higher than a predetermined load while the secondary valve 9 is controlled so as to be opened at a load higher than the predetermined load.</p> |
