Study on CO₂ Emission Characteristics of China VI Heavy Duty Diesel Engine

CATARC Automotive Test Center (Guangzhou) Co. Ltd. Guangzhou 511300, China

Abstract

CO₂ emission control is of great urgency, and the decrease of heavy-duty diesel engines’ CO₂ emission is one of the significant methods to reduce CO₂ emission. This paper uses a full-flow constantvolume dilution sampling system to experiment on the China VI heavy-duty diesel engine in order to measure CO₂ emissions under WHTC and WHSC cycles and different loads, with studying the instantaneous emissions characteristics of CO₂, post-processing effects on CO₂ emissions, influence factors of CO₂ emissions. The study found that the CO₂ emissions before the post-treatment of the WHSC cycle are 37% higher than that of the WHTC cycle, while emissions of CO₂ are 3.45% higher than that before post-treatment. Simultaneously, cold start increases the CO₂ emissions of the heavy-duty diesel engines by more than 1%. Post-treatment still increases the CO₂ emissions of heavy-duty diesel engines by 3.5%. In addition, CO₂ emissions have different trends with power at different speeds. CO₂ emissions get an incremental within 600rpm and 900rpm, which gradually becomes slower until it reaches the peak, as engine power increases; the CO₂ emissions initially increase, followed by a decrease, and then continue to increase within 1000rpm and 1400rpm; the CO₂ emissions are almost not affected by the speed within 1500rpm and 1900rpm.