Analysis of emission generation mechanism of heavy vehicles in plateau environment
In response to the unclear emission generation mechanism of heavy vehicles in plateau environment,using a vehicle equipped with a National VI heavy duty diesel engine as the research object,in a plateau environment of around 2400 meters,portable emission measurement system equipment(PEMS)was used to study the transient trend of pollutant emissions during cold start of vehicles under different load conditions.The research results indicated that,influenced by the thin air on the plateau,vehicles emit higher CO emissions under high load conditions in the early stage of operation,and unlike 10％and 50％loads,the emissions peak values of NOx,NO,and NO2 mainly occur during the operating time of 300～500 s under 100％load.In addition,under high load conditions,vehicles emit a high amount of soot particle,but as the water temperature increases,soot particle emissions rapidly decrease.Therefore,the CO,NO,,and PN emissions during cold start are still key projects for controlling pollutants,especially in plateau environment.
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维普
