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Engine NVH (Noise,European Cup live Vibration, and Harshness) is an indicator of car engine noise, vibration and harshness. With the continuous improvement of people's requirements for car comfort, the engine NVH has become an important factor affecting the driving experience. How to reduce the engine NVH and improve the driving comfort of the car is the goal that automotive engineers have been exploring for a long time. 1. The noise of the engine that reduces noise generation mainly comes from two aspects, one is mechanical noise, and the other is pneumatic noise. Mechanical noise comes from the vibration and movement of the internal parts of the engine, such as pistons, connecting rods, crankshafts and other parts, while pneumatic noise is the noise generated by airflow through the intake channel, exhaust channel and various parts of the cylinder.In order to reduce these noises, we need to apply various technical means to reduce noise sources, such as: - Optimize engine design, improve the processing and assembly accuracy of engine internal parts, and reduce defects and deviations; - Select high-quality mechanical parts and materials to reduce friction and interference between parts. ; - Apply noise prevention and control technology, such as applying sound-absorbing materials, increasing sealing, reducing resonance and noise reflection, etc.; - Reduce the generation of pneumatic noise, such as increasing sound insulation panels, optimizing intake and exhaust channels, reducing cylinder compression ratio, etc. Two. Reducing vibration transmission engine vibration is also an important factor in causing engine NVH. In order to reduce the transmission of vibration, we can take the following measures: - Optimize the engine structure design, reduce the number and amplitude of vibration sources, and reduce the generation of resonance phenomena;- Apply main and passive vibration isolation technology, such as isolation pads, elastic materials, liquid vibration isolators, etc., to reduce the transmission of engine vibration to the vehicle; - Optimize the design of the vehicle suspension system to reduce the vibration interference of road bumps to the vehicle; - Emphasize NVH testing and evaluation in vehicle design, and detect and solve abnormalities early Vibration problem. 3. Improve the debugging ability of the NVH whole vehicle. Although the noise reduction processing of the engine NVH is very important, it is not enough to ensure that the NVH index of the whole vehicle meets the requirements. The NVH debugging of the whole vehicle involves the engine, gearbox, chassis, steering system, body structure and other aspects. Comprehensive analysis and optimization integration are required to achieve the driving comfort of the whole vehicle. In order to improve the debugging ability of NVH vehicles, we can take the following measures: - Strengthen the construction of NVH test facilities and improve the reliability and accuracy of NVH measurement;- Apply advanced NVH analysis technology, such as finite element analysis, modal analysis, etc., to analyze and optimize the NVH performance of the whole vehicle and its components; - Strengthen the actual debugging ability of the whole vehicle NVH, and find and solve NVH problems early; - Strengthen NVH knowledge training and improve the NV of engineers H's ability to solve. In a word, reducing engine NVH is an important way to improve the driving comfort of cars. Automotive engineers need to constantly explore and apply new technical means to create a more comfortable driving experience for consumers.

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