Method for separating and extracting supercharger noise from engine noise

The invention discloses a method for separating and extracting supercharger noise from engine noise, and belongs to the technical field of automobile engines. The method comprises the steps that underthe condition that the rotating speed of an engine is controlled to be unchanged, a supercharger waste gas bypass valve is opened to discharge waste gas bypass, a noise frequency spectrum is recordedin the rapid supercharger rotating speed decreasing process, if noise disappears in the testing process, noise is not generated by a supercharger, and if noise still exists, the supercharger noise isone of noise sources; filtering analysis is carried out on the collected noise spectrum, and the noise type of the supercharger is determined; an acceleration sensor and a rotating speed sensor are arranged on a pressurizer pressing shell in an existing vehicle using state, a microphone pressurizer waste gas bypass valve is arranged in a cab to be connected with an air pump, and a bypass pipe airnozzle at the pressurizer p