Laboratory Tests of Modal Emissions and Off-Cycle Corrections to FTP-75

by Mark A. Carlock, California Air Resources Board, El Monte, United States,

Document Type: Proceeding Paper

Part of: Transportation Planning and Air Quality


The modeling of emissions from on-road mobile sources is an on-going process. Two broad topics which are currently under study are the evaluation of driving cycles and the development of a modal analysis model. This paper specifically addresses The Air Resources Board's efforts in the area of modal emissions analysies and corrections for 'off-cycle' emissions. It is shown that the emissions one predicts depends heavily upon what cycles are being evaluated and are considered to be typical. There are two ways to deal with this problem. The first requires the continual update of the definition of the 'typical' trip. The second is to improve the resolution of emissions analyses in order to properly attribute emissions to the microscale events responsible for them. The Air Resources Board is currently pursuing both approaches.

Subject Headings: Laboratory tests | Emissions | Aircraft and spacecraft | Terminology and definition | Legislation | Automobiles | Engines | Dissolved gases

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