Noise elimination system and noise elimination method for air inlet and exhaust system and vehicle

The invention provides a noise elimination system and noise elimination method for an air inlet and exhaust system and a vehicle. The noise elimination system comprises a signal acquisition unit, a control unit and an execution unit, wherein the signal acquisition unit is used for acquiring sound pressure signals in an air inlet cavity of an air inlet pipeline, the control unit is used for carrying out frequency spectrum analysis on the sound pressure signals so as to obtain an actual peak frequency in the air inlet cavity, comparing the actual peak frequency with a preset peak frequency of the control unit, and sending a corresponding control instruction according to the comparison result. The execution unit can adjust the size of an expansion cavity of a silencer of the noise eliminationsystem according to the control instruction, the purpose of automatic noise elimination and noise reduction is reached. The noise elimination system is provided with the signal acquisition unit, thesound pressure signals in