On the Change of Circulating Emission and After-treatment Effect of Diesel Engine WHSC
Studying the emission characteristics of starting conditions is of great significance to further reduce the emission of gaseous pollutants.In this paper,it talks WHSC test cycle for a diesel engine of China VI with DOC + DPF + SCR + ASC exhaust gas purification device(Hereinafter referred to as after-treatment)based on the 2 206 m high altitude engine test bench,it analyzes the difference of original emission and exhaust emission of diesel engine under hot and cold starting conditions,the conversion efficiency of gas pollutants in the after-treat-ment is also calculated.The results show that the emission concentration of CO and THC in the cold starting cy-cle of diesel engine is significantly greater than the hot starting cycle regardless of the original emissions or ex-haust emissions,and the emission laws are similar;However,the original emission concentration of NOx in the cold starting cycle is less than that in the hot starting cycle.In the hot starting cycle of after-treatment,the con-version efficiency of CO,THC and NOx emission concentration is good,basically above 90%,but the conversion efficiency of CO emission concentration in the cold starting cycle of after-treatment is poor,only 9.2%.
High altitudeDiesel engine of China VIWHSC cycleCold and hot starting conditionEmis-sionAfter-treatment
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