Control device for eliminating roars in car

Abstract

A control device for eliminating roars in a car comprises a sound pressure sensor, a vibration exciter and a controller. The sound pressure sensor collects sound signals above the driver head and sends the collected signals to a signal input end of a controller. The vibration exciter is fixed on a car roof and is connected with a signal output end of the controller. When the amplitude of the sound signals output by the sound pressure sensor exceeds the set threshold, the controller damage the car body resonance condition and eliminates the roars in car by adjusting the vibration amplitude, the frequency and the phase angle of the vibration exciter. By means of the control device, the vibration exciter is used for interfering with vibration of the roof to damage the car body resonance condition, and accordingly, the roars in car are prevented effectively, and the car noise vibration and harshness (NVH) characteristic is improved. By means of the device, the problem of roars of any frequencies can be solved in real time, car body parts are not needed to be changed, and time and fund waste is prevented.

Description

technical field [0001] The invention relates to a device capable of effectively preventing resonance noise from being generated inside an automobile, and belongs to the technical field of automobiles. Background technique [0002] The noise (Noise), vibration (Vibration), and harshness (Harshness) of a car are collectively referred to as the NVH characteristics of a car, which is an important factor to measure the quality of car design and manufacturing. In-vehicle roar noise is one of the most important issues in the field of NVH research, and it is an important indicator to determine the comfort of passenger cars. Studies have shown that the roaring noise in the car is mainly caused by the resonance of the cavity surrounded by large body panels (such as front wall, floor, roof, side wall, etc.) under the action of engine excitation and road surface excitation. At present, the main measure to avoid roaring noise in the car is to change the body sheet metal structure or add...

AI Technical Summary

Problems solved by technology

At present, the main measure to avoid roaring noise in the car is to change the body sheet metal structure or add a shock absorber. The method of changing the body sheet metal structure involves the scrapping and development of molds, which requires a lot of time and money wasted; the technical solution of adding a shock absorber can only solve the problem. The roaring noise problem at a certain frequency has little effect on the roaring noise at other frequencies. Since the resonance frequency of the car body will change when it is affected by some factors (such as load, window status, etc.), this method cannot effectively eliminate it. Roaring noise phenomenon in the car

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