Emission characteristics of a diesel engine for a construction machinery based on PEMS test
Based on a China non-road Ⅳ diesel engine used by excavator,the portable emission measurement system(PEMS)test method is adopted to study the emission characteristics of the actual operation in different working conditions,the emission factors based on power,time and fuel consumption are calculated,and the difference in specific emission of gaseous pollutonts based on time-weighted and power-based window method is analyzed.Research result shows that the actual operating conditions of the digger are mainly distributed in the medium and high rotating speed and load areas.The output work of diesel engine accounts for 96％of the total output work.The distribution of fuel consumption characteristics in the actual operating environment of the excavator is related to the working conditions,the highest specific fuel consumption in the idle speed condition,for 408.65 g/(kW·h).The power-based emission factors of NOx and CO of idling are significantly higher than the moving and working conditions,CO and NOx emission factors of power,time,fuel consumption are basically at the same level under moving and working conditions.The NOx emission factor and NOx emission mass are the highest under the cold starting condition.The specific emission of gaseous pollutants based on time-weighted are larger than that of the power-based window method,NOx emission is about 1.9 times higher.
non-road construction machineryemission characteristicsPEMSactual operation
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