Fuel economy and pollutant emissions analysis of diesel taxies in Shanghai

The fuel economy and pollutant emissions characters of diesel taxies in Shanghai were analyzed. In particular, the fuel consumption and fuel cost per 100 kilometers, turnover, traveled distance, service kilometers, empty-loaded rate, and CO, NOX, HC+NOX, PM emissions characteristics of diesel taxies were carried out. The analysis result shown that compared with gasoline taxies, the fuel consumption and fuel cost per 100 kilometers of diesel taxies were reduced by 29% and 26% respectively. Diesel taxies will get more traveled distance, further service kilometers, and added turnover, whereas lower empty-loaded rate and less fuel cost per 100 kilometers. Among the total 120,000 kilometers test distance, the CO emission of diesel taxies was lower than the limited value of China national emission standard IV, the NOX and HC+NOX emission is under the limited value of China national emission standard III, whereas, the PM emission was under the limited value of China national emission standard II. All of CO, NOX, HC+NOX, and PM emissions of diesel taxies were reduced obviously when fuel by Shanghai IV diesel after 1st November, 2009.