| 摘要 |
Operating noise reduction structure of an ISCA is provided to reduce noise generation maximally by installing partition walls in an inlet end and an outlet end of a bypass passage and reducing flow rate of intake air. Operating noise reduction structure of an ISCA(Idle Speed Control Actuator)(30) comprises a bypass passage(31), a solenoid valve(41) and a plurality of partition walls(51). The bypass passage makes intake air supplied through a main passage(21) to be bypassed and supplied to a surge tank(10). The solenoid valve is installed to the bypass passage, and controls intake air amount supplied to the surge tank. The partition walls are respectively installed in an inlet end(31a) and an outlet end(31b) of the bypass passage and spaced to each other by equal distance.
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