Real-World Emissions from a Modern Production Vehicle Driven in Los Angeles

摘要: The emissions of hydrocarbons, nitric oxide, and carbon monoxide from one modern vehicle were measured using on-board instrumentation during about 350 miles driving in Los Angeles, California. Emissions on-road compared to those obtained on dynamometers the urban dynamometer schedule (UDDS). Although this study only used driver vehicle, tested over a relatively short distance, analysis technique may be useful for larger evaluation off-cycle emissions. test had low warmed-up running UDDS most testing where air-to-fuel ratio was maintained at stoichiometric point. However, occasional heavily-loaded conditions led richerthan-stoiehiometric operation. During these brief enrichment events, which lasted up 29 seconds, CO increased by factor 2500 HC 40 closed-loop Nitrogen oxide sim...