| 摘要 |
PURPOSE:To reduce the deterioration of engine output and the vibration by communicating a surge tank through two communication paths and opening a changeover valve provided in one communication path continuously under such operating region where the engine load is lower than setting level. CONSTITUTION:Under operation of engine, the outputs from a rotation sensor 14 and a negative pressure 15 are fed to a control circuit 16. The control circuit 16 will read out an open or close signal from a changeover control map thus to open/close the changeover valve 12 through an actuator 13. Here, said valve 12 is closed under heavy load low rotation region of engine, for example, to produce the primary resonance of the intake air in a surge tank 1 with inherent primary frequency to be determined by the shape of first communication path 9 thus to perform highly efficient resonance supercharge to each cylinder through each suction manifold 5a-5f. Said valve 12 is opened continuously under low load region to feed the intake air between each chamber 3, 4 of surge tank 1 through second communication path 10 thus to feed same volume of intake air to each cylinder. |
