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With the optimization of catalyst coating technologies and formulations in response to China VI emission regulations, the technologies of exhaust pollutant emission control devices for China VI vehicles have been continuously upgraded. However, since the emission durability test specified in China VI regulations is a recommended development item, there are relatively few studies on the durability evaluation of new catalyst coatings and formulations. In this paper, a light-duty China VI vehicle was used to conduct durability tests on domestic pollutant emission control devices, and the real-vehicle deterioration factors and vehicle emission characteristics were analyzed. The results show that the real-vehicle deterioration factors of domestic catalysts are higher than the multiplicative deterioration factors specified in the China VI standard for light-duty vehicles; except that the multiplicative deterioration factor for NOₓ emission is 16.7% lower than the standard value, the multiplicative deterioration factors for HC, NMHC and CO are at least 22% higher than the standard. The unburned HC and CO emissions of the vehicle mainly occur during vehicle start-up, at medium–low speeds of 20–50 km/h, and at high speeds above 100 km/h. NOₓ emissions occur during acceleration and deceleration conditions within the speed range of 10–90 km/h. In the future, it is necessary to optimize the domestic catalyst coating technology and carry out adaptive matching calibration according to the characteristics of domestic catalysts.

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Analysis of Emission Levels of Light-Duty Vehicles with Vehicle Endurance Aging

  • 会议论文

  • 发表日期：

    2026年

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  • Junchen Zhang,
  • Qingmao Zhang,
  • Jin Li,
  • Jie Wang,
  • Zongxin Dai,
  • Xionghui Zou,
  • Hanzhengnan Yu

摘要

With the optimization of catalyst coating technologies and formulations in response to China VI emission regulations, the technologies of exhaust pollutant emission control devices for China VI vehicles have been continuously upgraded. However, since the emission durability test specified in China VI regulations is a recommended development item, there are relatively few studies on the durability evaluation of new catalyst coatings and formulations. In this paper, a light-duty China VI vehicle was used to conduct durability tests on domestic pollutant emission control devices, and the real-vehicle deterioration factors and vehicle emission characteristics were analyzed. The results show that the real-vehicle deterioration factors of domestic catalysts are higher than the multiplicative deterioration factors specified in the China VI standard for light-duty vehicles; except that the multiplicative deterioration factor for NOₓ emission is 16.7% lower than the standard value, the multiplicative deterioration factors for HC, NMHC and CO are at least 22% higher than the standard. The unburned HC and CO emissions of the vehicle mainly occur during vehicle start-up, at medium–low speeds of 20–50 km/h, and at high speeds above 100 km/h. NOₓ emissions occur during acceleration and deceleration conditions within the speed range of 10–90 km/h. In the future, it is necessary to optimize the domestic catalyst coating technology and carry out adaptive matching calibration according to the characteristics of domestic catalysts.