Comparative analysis on emission characteristics of normal temperature cold start of gasoline vehicles

Abstract

According to the requirements of Normal Temperature Cold Start for the current China six automobile, choose four different light-duty gasoline vehicles, use Beijing six gasoline to carried out type I emission test. Assess WLTC emissions of each interval under the condition of different emission difference, and the causes of pollutant formation in different stages were analyzed. The results show that the WLTC circulation under the cold start phase is still the most pollutants discharge stage, specific performance in cold start phase before the 50s, the main reason is that the exhaust temperature is too low and the catalyst does not light up; Secondly, more pollutants will be produced in the extra-high speed stage, in this stage, open-loop control is used.

Keywords

• type i emission test
• emissions generated
• gasoline vehicles
• cold start