The development of powertrain vibration and noise (NVH) performance includes benchmarking and setting target values, design inspection and optimization in the early pre-research stage of the project, as well as verification of later product applications, after-sales feedback improvement, etc., involving product design, mechanism analysis, NVH control technology, software optimization and other fields, with strong professional skills.
With domestic vehicles starting late and powertrain NVH technology immature, SAIC Technology Center has gradually established a complete forward development system for powertrain NVH technology based on the group's resource advantages and combined with its own efforts, and has reached international level in some aspects. This project mainly includes innovative application technologies for NVH development and control of engines, transmissions and intake systems.

1. Innovative Engine NVH Control Technology
   With the advanced engine semi-anechoic chamber as the carrier and supported by internationally advanced testing and analysis technology, a complete engine semi-anechoic chamber noise test system has been established from target setting, design inspection, CAE analysis, bench testing, vehicle testing, production inspection to after-sales rectification. Under the guidance of the test system, cylinder knocking problems, high-pressure fuel system noise, opposed balance shaft Rattle noise, timing chain transmission system howling, electronic water pump noise, Major issues such as supercharger noise.
2. Innovative technology for gearbox NVH control
   In the current powertrain design, the development of gearboxes not only needs to meet functional requirements such as deceleration, torque increase, and durability, but also pays more attention to driving control quality and driving comfort, thus having strong market competitiveness. The project team members have worked hard for a long time to improve the NVH evaluation system and testing standards independently developed by the gearbox body. They have successfully solved NVH problems such as Rattle, Whine, Judge, Shuffle, Clunk and other abnormal noises in Gearboxes such as SH63P, SCM250 and DCT360. Related technology has been widely used in Roewe, MG and other models, especially in the independently developed wet dual clutch gearbox products, and has been well recognized in the after-sales market.
3. Innovative technology for NVH control of intake system
   A complete NVH work flow and technical specifications for engine air intake system have been established, tracked the development trend of international advanced technologies, and innovatively applied to the development projects of self-owned brand models and models. Using the combination of muffler elements such as resonant cavities, porous silencers, and high-pressure pipeline silencers, the engine intake system noise, pressure pulsation noise, vortex noise, airflow friction noise, as well as broadband airflow noise and pressure relief noise of supercharged engines are suppressed, providing a good guarantee for the smooth development of independent brand model projects.
   Through the application of innovative powertrain NVH control technology, the perceived quality of NVH of self-owned brand models has been improved and product market competitiveness has been enhanced; at the same time, the structural design of parts has been simplified, the product development cycle and cost, as well as the cost of after-sales service of products have been reduced., saving a total of approximately 84 million yuan.