The research of car engine rotating speed adaptive active control system

On the basis of analyzing the characteristics of the noise inside the car, according to the characteristic that the main peak frequency of the noise inside the car is closely related to the engine speed, the method of constructed the initial secondary sound source reference signal of the active noise control system by the engine speed signal is proposed, research the active noise control strategy and the adaptive control algorithm based on this method, build the Active Noise Reduction System inside the car. Through the simulation study of active noise control shows that, the structure of this system is simple and easy to implement and can significantly reduce the noise at the main peak in the low-frequency noise spectrum inside the car caused by engine vibration and noise radiation. In different engine speed, the noise reduced by about 10dB.