Turbocharger Noise Quality Parameters for Efficient TC Noise Assessment and Refinement

摘要

Due to more challenging future emission legislations and the trend towards downsizing, the number of turbocharged (TC) engines, especially petrol engines, is steadily increasing. The usage of TC has high risk to cause different noise phenomena apparent in the vehicle interior which are often perceived as annoying for the passengers. In order to further improve consideration of TC topics in the development, objective judgment and monitoring of TC noise issues is of high importance. Therefore, objective parameters and corresponding tools that are especially focusing on TC noise phenomena have to be developed. One main target of these tools is to deliver an objective TC assessment in an efficient way and with minimum additional effort. Application of the criteria presented in this publication therefore allows acoustic engineers to judge the NVH behavior and annoyance of the TC with respect to its vehicle interior noise contribution. Based on this assessment TC noise issues can be detected efficiently and appropriate noise reduction measures can be derived accordingly. Main focus of this publication is to explain the introduced parameters. For further clarification, an example which demonstrates the possible usage of TC noise quality parameters during the development will be presented.