00743722

Component

https://doi.org/10.3141/1587-09

http://scholar.google.com...beck&publication_year=1997

The initial phase of a long-term project with national implications for the improvement of transportation and air quality is described. The overall objective of the research is to develop and verify a computer model that accurately estimates the impacts of a vehicle's operating mode on emissions. This model improves on current emission models by allowing for the prediction of how traffic changes affect vehicle emissions. Results are presented that address the following points: vehicle recruitment, preliminary estimates of reproducibility, preliminary estimates of air conditioner effects, and preliminary estimates of changes in emissions relative to speed. As part of the development of a comprehensive modal emissions model for light-duty vehicles, 28 distinct vehicle/technology categories have been identified based on vehicle class, emission control technology, fuel system, emission standard level, power-to-weight ratio, and emitter level (i.e., normal versus high emitter). These categories and the sampling proportions in a large-scale emissions testing program (over 300 vehicles to be tested) have been chosen in part based on emissions contribution. As part of the initial model development, a specific modal emissions testing protocol has been developed that reflects both real-world and specific modal events associated with different levels of emissions. This testing protocol has thus far been applied to an initial fleet of 30 vehicles, where at least 1 vehicle falls into each defined vehicle/technology category. The different vehicle/technology categories, the emissions testing protocol, and preliminary analysis that has been performed on the initial vehicle fleet are described.

This paper appears in Transportation Research Record No. 1587, Effects of Transportation on Energy and Air Quality.

English

p. 73-84

1997

Transportation Research Record

0309061695

Figures (8) ; References (6) ; Tables (5)

Computer models; Emissions testing; Impacts; Light vehicles; Mathematical models; Pollutants; Testing; Vehicle operations

Vehicle operating modes

Environment; Highways

TRIS, TRB, ATRI

Dec 24 1997 12:00AM

• ALTERNATIVE FUEL VEHICLE PROGRAMS: APPLICABILITY OF GOVERNMENT INCENTIVES
• ANOTHER WAY TO GO? SOME IMPLICATIONS OF LIGHT-DUTY DIESEL STRATEGY
• BINARY RECURSIVE PARTITIONING METHOD FOR MODELING HOT-STABILIZED EMISSIONS FROM MOTOR VEHICLES
• CONFORMITY: LONG-TERM PROGNOSES FOR SELECTED OZONE NONATTAINMENT AREAS IN CALIFORNIA
• COST ESTIMATES OF TRANSPORT AIR POLLUTION IN SANTIAGO, CHILE
• DEVELOPMENT OF COMPREHENSIVE MODAL EMISSIONS MODEL: OPERATING UNDER HOT-STABILIZED CONDITIONS
• EMISSIONS IMPACT OF ELIMINATING NATIONAL SPEED LIMITS: ONE YEAR LATER
• EMISSIONS REDUCTIONS FROM VEHICLE RETIREMENT PROGRAMS
• FORECASTING COST PATH OF ELECTRIC VEHICLE DRIVE SYSTEM: MONTE CARLO EXPERIENCE CURVE SIMULATION
• IMPLICATIONS OF TRANSIENT MODE DURATION FOR SPATIALLY DISAGGREGATED HIGH-RESOLUTION EMISSION INVENTORY STUDIES
• MODELING FRAMEWORK FOR ESTIMATING EMISSIONS IN LARGE URBAN AREAS
• QUEUEING ALGORITHM FOR CALCULATING IDLING EMISSIONS IN FLINT--THE FLORIDA INTERSECTION AIR QUALITY MODEL
• TRANSITIONAL ALTERNATIVE FUELS AND VEHICLES MODEL
• USE OF EPISODIC CONTROLS TO REDUCE FREQUENCY AND SEVERITY OF AIR POLLUTION EVENTS