Biodiesel is a promising
clean and alternative fuel that can meet
the demand of energy saving and environmental protection. In this
study, the effects of biodiesel blends on the gaseous and particulate
emission characteristics of China-III, IV, and V urban buses were
investigated based on a heavy chassis dynamometer. The results showed
that the biodiesel blend resulted in a reduction in CO, THC, PN, and
PM emission but an increase in the NOx and CO
2
emission,
and the effects were enhanced with the biodiesel ratio, which also
depended on the bus speed. Simultaneously, the emission standards
of buses had an obvious effect on the emissions and changed the effect
of biodiesel on the emissions. A higher emission standard of the bus
highlighted the effect of biodiesel on the emission. From China-III
to China-IV to China-V buses, the comprehensive changes produced by
B5 in the emissions increased from 5.57 to 6.78 to 6.83%, while for
B10, a significant increase in the changes was obtained, reaching
12.98, 14.68, and 15.02%, respectively, for the three emission stage
buses.