title: Development and application of a mobile laboratory for measuring emissions from diesel engines. 1. Regulated gaseous emissions.
abstract: Information about in-use emissions from diesel engines remains a critical issue for inventory development and policy design. Toward that end, we have developed and verified the first mobile laboratory that measures on-road or real-world emissions from engines at the quality level specified in the U.S. Congress Code of Federal Regulations. This unique mobile laboratory provides information on integrated and modal regulated gaseous emission rates and integrated emission rates for speciated volatile and semivolatile organic compounds and particulate matter during real-world operation. Total emissions are captured and collected from the HDD vehicle that is pulling the mobile laboratory. While primarily intended to accumulate data from HDD vehicles, it may also be used to measure emission rates from stationary diesel sources such as back-up generators. This paper describes the development of the mobile laboratory, its measurement capabilities, and the verification process and provides the first data on total capture gaseous on-road emission measurements following the California Air Resources Board (ARB) 4-mode driving cycle, the hot urban dynamometer driving schedule (UDDS), the modified 5-mode cycle, and a 53.2-mi highway chase experiment. NOx mass emission rates (g mi(-1)) for the ARB 4-mode driving cycle, the hot UDDS driving cycle, and the chase experimentwerefoundto exceed current emission factor estimates for the engine type tested by approximately 50%. It was determined that congested traffic flow as well as "off-Federal Test Procedure cycle" emissions can lead to significant increases in per mile NOx emission rates for HDD vehicles.
authors.affiliation: Bourns College of Engineering, Center for Environmental Research and Technology, and Department of Chemical and Environmental Engineering, University of California-Riverside, 1084 Columbia Avenue, Riverside, California 92507, USA. dcocker@engr.ucr.edu
authors.forename: David R
authors.initials: DR
authors.lastname: Cocker
authors.forename: Sandip D
authors.initials: SD
authors.lastname: Shah
authors.forename: Kent
authors.initials: K
authors.lastname: Johnson
authors.forename: J Wayne
authors.initials: JW
authors.lastname: Miller
authors.forename: Joseph M
authors.initials: JM
authors.lastname: Norbeck
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D004784:Environmental Monitoring / Q000295:instrumentation*; D004867:Equipment Design; D012680:Sensitivity and Specificity; D001335:Vehicle Emissions / Q000032:analysis*; D014835:Volatilization
chemical_list: D000393:Air Pollutants; D001335:Vehicle Emissions