Vehicle interior noise active control method and system based on pavement roughness preview

The invention discloses an in-vehicle noise active control method and system based on pavement roughness preview, and the method comprises the steps: obtaining the current preview pavement roughness at the current moment and the previous preview pavement roughness at the previous moment, when the difference value between the current preview pavement roughness and the previous preview pavement roughness is greater than a preset threshold value, acquiring a vibration acceleration signal corresponding to the current preview pavement roughness; filtering the vibration acceleration signal to obtain a secondary anti-noise signal; and acquiring signal output delay time and a noise source signal, and when the signal output delay time is reached, performing acoustic superposition processing on the secondary anti-noise signal and the noise source signal to offset the noise source signal. According to the method, the change of the road surface roughness is recognized through preview, the secondary anti-noise signal is g