Design and evaluation of the emissions measurement components for a heavy-duty diesel-powered vehicle mobile emissions measurement system (MEMS)

The objective of this study was the design, construction, and preliminary qualification of the Mobile Emissions Measurement System (MEMS) for in-use, on-road testing of heavy-duty diesel-powered vehicles. This included selection of emissions analyzers and sampling system components capable of producing emissions results of similar accuracy to those attained with laboratory-grade instruments. A thorough investigation of commercially available systems, and a literature review, identified no suitable designs. Therefore, a complete emissions measurement system, designed specifically for the testing of heavy-duty diesel powered vehicles, was developed using available components.;The candidate analyzers that performed successfully during bottled gas bench tests were then incorporated into a sampling system and tested with diesel engine exhaust. Emissions concentrations reported by the MEMS were compared to concentrations reported by laboratory-grade analyzers. Results indicated that the system is capable of reporting cycle-integrated, brake-specific CO2 within 3%, and NOx within 5% of laboratory data over an FTP cycle