Evaluation of the Bag Mini-Diluter and Direct Vehicle Exhaust Volume System for low level Emission Measurement

摘要

With the adoption of the California Low-Emission Vehicle Regulations and the associated lower emission stan- Dards such as LEV (Low-Emission Vehicle in 1990), ULEV (Ultra-Low-Emission Vehicle), and LEV II (1998 With SULEV-Super Ultra Low Emission Vehicle), con- Cerns were raised by emissions researchers over the Accuracy and reliability of collecting and analyzing emis- Sions measurements at such low level. The primary con- Cerns were water condensation, optimizing dilution ratios, And elimination of background contamination. These con- Cerns prompted a multi-year research program looking at Several new sampling techniques. This paper will Describe the cooperative research conducted into one of These new technologies, namely the Bag Mini-Diluter (BMD) and Direct Vehicle Exhaust (DVE) Volume system.