00743720

Component

https://doi.org/10.3141/1587-07

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

A comprehensive modal emissions model for light-duty cars and trucks is being developed. More than 300 real-world vehicles are being recruited for in-house dynamometer testing under as-is conditions to provide the foundation for the model. The model is designed to predict second-by-second tailpipe emissions under a variety of driving conditions. The vehicles can be modeled as individual vehicles with properly functioning, deteriorated, or malfunctioning emission control conditions, or as composite vehicles representing different vehicle technology categories. The model is based on a simple parameterized physical approach and consists of six modules that predict engine power, engine speed, air/fuel ratio, fuel use, engine-out emissions, and catalyst pass fraction. When developing the model, four important vehicle operating conditions are considered: cold and warm starts; normal, stoichiometric operation; high-power enrichment; and lean-burn operation. The model concept and the expected input/output requirements of the model are discussed. The general structure of the model also is presented, focusing on emissions for vehicles operating under hot-stabilized conditions. Preliminary results of the model are given, and comparisons are made between the modeled and measurement results for 17 sample vehicles. Preliminary results show good agreement.

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

English

p. 52-62

1997

Transportation Research Record

0309061695

Figures (5) ; References (18) ; Tables (5)

Power modules; Alternatives analysis; Driving; Forecasting; Light trucks; Light vehicles; Mathematical models; Measurement; Pollutants

Driving conditions; Modules

Environment; Highways

TRIS, TRB, ATRI

Dec 24 1997 12:00AM

• ALTERNATIVE FUEL VEHICLE PROGRAMS: APPLICABILITY OF GOVERNMENT INCENTIVES
• ANALYSIS OF MODAL EMISSIONS FROM DIVERSE IN-USE VEHICLE FLEET
• 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
• 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