Importance

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Abstract

An intake silencer of the variable type is for reducing noise generated coming from the difference between the inner pressure and the outer pressure of a combustion chamber when an intake valve being opened or closed. The present invention for reducing noise comprises a signal processing part, a signal comparing part and a valve driving part. In the signal processing part, a RPM sensor modulates a waveform obtained by detecting the revolution number of the engine and a F/V converter changes it thereafter emitting a signal to the signal comparing part. In the signal comparing part, a plurality of comparators emit the opened and closed signal to a valve driver by comparing a output signal emitted from the signal processing part with a basic signal. In the valve driving part, when the corresponding valve driver turns on or off by virtue of the signal emitted from the corresponding comparator, a corresponding actuator opens or closes the corresponding valve dividing the inside of the side branch. Thus, it can rapidly change its capacity according to the change of the revolution number of the engine and also has the simple structure and the small size.

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First Claim