关键词: 轻型车；柴油机；IUPR

Abstract: The emission regulations for light vehicles in China VI b require that the in use performance frequency (IUPR) of vehicles should not be less than 0.336. To meet this strict requirement, vehicle manufacturers need to model the IUPR rate before mass production to understand the changes rule in IUPR under different usage environments. This article proposes a comprehensive IUPR road validation method, aiming to make the validation results more closely related to the actual operation of in use vehicles. In addition, an in-depth analysis is conducted on the issue of low monitoring frequency discovered during the verification process, and effective improvement measures are proposed in the development stage to ensure that the in use monitoring frequency of vehicles after being put into market operation meets regulatory requirements.

Key words: light vehicles; diesel; IUPR