Why is there noise when Skoda Ming Rui 20 15 Yi Jie is idling?

It is suggested to go to the repair shop to check whether the engine condition is the cause of engine adjustment and carbon deposition. Secondly, it is suggested to check the engine accessories, whether it is caused by the performance degradation of engine accessories, which can be improved by cleaning the throttle valve, idle valve body and engine fuel nozzle.

2. Extension of related knowledge:

The combustion exciting force and mechanical exciting force of the engine are transmitted to the external surface of the engine through various structural parts, forming the vibration response of the surface. The vibration of the engine surface excites the vibration of adjacent air medium particles, forming sound waves to radiate outward, that is, the surface radiation noise of the engine. The radiated noise from the engine surface is introduced into the car through the firewall and chassis, forming idle noise.

3. Solution:

The rigidity of the crankcase can be improved by increasing the wall thickness, adding ribs, improving the structure of the crankcase, adding intermediate partitions and adopting integral bearing beams or bearing seats, so that the natural frequency of the structure can be increased to the area with large structural attenuation coefficient, thus achieving the purpose of noise reduction. Shell parts have the characteristics of thin wall and flat surface, which is the main source of surface radiation noise. By increasing its stiffness, its natural frequency can be improved. Or by applying damping materials to improve its natural frequency, so as to avoid the noise caused by vibration.