Emission Characteristics of an Inuse China Four Diesel Bus Fueled with B5

Abstract:

The characteristics of particulate matter and gaseous emission from a ChinaIV diesel bus burning diesel and biodiesel with 5% blend ratio were tested on heavy chassis dynamometer under China City Bus Driving Cycle (CCBC). The results indicated that the bus working condition under CCBC is mainly during 900~1 100 r?min-1 and 200~500 N?m, which shows the characteristics of low speed and middlelow load. The total hydrocarbon(THC), NOX, particulate matter(PM) and particulate number(PN) emission factor of diesel and biodiesel is higher at low speed, while the CO emission factor is higher at high speed. Compared with diesel, the THC and NOX emission of biodiesel is increasing, while the CO and PM emission is decreasing, and the PN emission of B5 is almost the same with diesel. On the working conditions of idle and middlelow speed acceleration the THC emission rate becomes higher, while the NOX emission rate is higher on the working conditions of middlelow speed acceleration. PN emission rate is much higher on the working conditions of middlehigh speed acceleration and high uniform speed. That’s the reason why THC, NOX, PN emission rates of B5 increase. Except for the higher CO emission rate during middlelow speed acceleration and higher PM emission during lowspeed acceleration, deceleration and uniform speed, CO and PM emission on the other working conditions is lower. That’s the main reason why CO and PM emission of B5 decreases under CCBC.