On-Board Heavy-Duty Truck Mobile Emission Testing in Support of Mobile SourceEmission Inventories and On-Board Emissions Factor for Diesel Bus

摘要

The objective of this project was the development and testing of on-boardemissions measurement capability for heavy-duty vehicles utilizing a new unique measuring technique, On-Board Heavy-Duty Truck Mobile Emission Testing in Support of Mobile Source Emission Inventories for the California Air Resources Board (CARB). The technology approach is presented in Section 2. Section 3 discusses how the stationary-source testing technology was adapted to measure emissions from a diesel bus outfitted with special sensors and the equipment that was proposed and used during the tests. Section 4 presents the various test plans and Section 5 describes tests that were carried out. Section 5 discusses, in particular, many of the difficulties that were encountered during the tests resulting in the need to repeat the first chassis dynamometer test at the Los Angeles County Metropolitan Transportation Authority (LACMTA). Section 6 presents test data evaluations and results. Section 7 presents recommendations for further development of the system and further evaluation of the collected test data. Appendix A contains the technical paper presented at the CRC On-Road Vehicle Emissions Workshop at the Hyatt Islandia, San Diego, CA in April 1995 and Appendix B and C contain test data collected during the chassis dynamometer and on-road testing, respectively.