00725658

Component

https://doi.org/10.1177/0361198196152000110

https://scholar.google.co...Ross&publication_year=1996

Mobile source emission models currently used by state and federal agencies (e.g., Environmental Protection Agency's MOBILE and California Air Resources Board's EMFAC) are often inadequate for analyzing the emissions impact of various transportation control measures, intelligent transportation systems, alternative fuel vehicles, and more sophisticated inspection/maintenance programs contained in most state air quality management plans. These emission models are based on the assumption that vehicle running exhaust emissions can be represented as integrated values for a specific driving cycle, and then later adjusted by speed correction factors. What is needed in addition to these "regional-type" mobile source models is an emissions model that considers at a more fundamental level the modal operation of a vehicle (i.e., emissions that directly relate to vehicle operating modes such as idle, steady-state cruise, various levels of acceleration/deceleration, and so forth). A new modal-emissions modeling approach that is deterministic and based on analytical functions that describe the physical phenomena associated with vehicle operation and emissions productions is presented. This model relies on highly time-resolved emissions and vehicle operation data that must be collected from a wide range of vehicles of varying emission control technologies. Current emission modeling techniques are discussed and the modeling approach and implementation plan for a new, three-year NCHRP Project entitled "Development of a Modal Emissions Model" are described.

This paper appears in Transportation Research Record No. 1520, Transportation-Related Air Quality and Energy.

01398720

English

p. 81-88

1996

Transportation Research Record

309062152

Figures (2) ; References (37) ; Tables (2)

Emission control systems; Mathematical models; Pollutants; Vehicle operations

Models; Vehicle operating modes

Highways; Vehicles and Equipment

TRIS, TRB

Sep 24 1996 12:00AM

• ASSESSING EMISSIONS CONTRIBUTION OF INTERCITY TRUCKING
• ECONOMIC INCENTIVES TO MITIGATE IMPACTS OF STATE LOW-EMISSION VEHICLE STANDARD FOR HEAVY-DUTY VEHICLES
• EMISSIONS ANALYSIS OF SOUTHERN CALIFORNIA METROLINK COMMUTER RAIL
• EMISSIONS COMPARISON BETWEEN TRUCK AND RAIL: CASE STUDY OF CALIFORNIA I-40
• EVALUATING TRAVEL AND AIR QUALITY COST-EFFECTIVENESS OF TRANSPORTATION DEMAND MANAGEMENT PROJECTS
• IMPACTS ON HOME HEATING COSTS OF INCENTIVES FOR ALTERNATIVE FUEL VEHICLES
• ISSUES AND COSTS ASSOCIATED WITH TRANSITION TO ALTERNATIVE TRANSPORTATION FUELS AND VEHICLES
• OPERATING MODE FRACTIONS ON URBAN ROADS DERIVED BY TRAFFIC ASSIGNMENT
• POTENTIAL COVERAGE OF ALTERNATIVE FUEL INDUSTRIES UNDER EPACT SECTION 501
• POTENTIAL IMPACTS OF ENERGY POLICY ACT ON ELECTRICITY AND NATURAL GAS PROVIDER FLEETS
• PROJECT-LEVEL AIR QUALITY ASSESSMENT ACTIONS: INTERRELATING CONFORMITY WITH NATIONAL ENVIRONMENTAL POLICY ACT PROCESS
• ROLE OF OFF-MODEL TOOLS IN NETWORK-BASED REGIONAL CONFORMITY ANALYSIS
• SIMULATING AUTOMOBILE EMISSIONS IN AN INTEGRATED URBAN MODEL
• STATE VEHICLE FLEETS AND THEIR POTENTIAL ACQUISITION OF ALTERNATIVE FUEL VEHICLES UNDER EPACT 507
• STRATEGIES FOR REDUCING ENERGY CONSUMPTION AND EMISSIONS IN TEXAS TRANSPORTATION SECTOR
• TRANSPORTATION PERSPECTIVE OF OZONE TRENDS IN CLEAN AIR ACT NONATTAINMENT AREAS
• TRAVEL DEMAND ANALYSIS IMPACTS ON ESTIMATION OF MOBILE EMISSIONS
• USING GPS TECHNOLOGY TO RELATE MACROSCOPIC AND MICROSCOPIC TRAFFIC PARAMETERS
• WHAT REALLY IS THE GROWTH OF VEHICLE USAGE?