Abstract:

Basic Exhaust Emission Rates of Open Loop Vehicles for MOBILE6:
Exhaust Emissions at High and Low Altitudes for Engine Starts and
Running Emissions for Motorcycles, Light Duty Diesel Vehicles and
Trucks and Pre-1981 Model Year Light Duty Gasoline Vehicles and
Trucks

   April 2001
 
   EPA Publication Number (EPA 420-R-01-027)
   
   MOBILE6 Report Number (M6.EXH.005)

   Available at: (http://www.epa.gov/otaq/m6.htm)

   David Brzezinski and
   John Gilmore
   U.S. Environmental Protection Agency
   Office of Transportation and Air Quality 
   Assessment and Standards Division

"Open loop" is a term that refers to vehicles which do not use
electronic feedback systems to control the delivery of fuel to
the engine cylinders.  Most current light-duty vehicles make use
of feedback systems.  However, motorcycles, older light-duty
vehicles and most diesel vehicles are open-loop.  This report
discusses how the basic rates for both engine starts and exhaust
running emissions for these open loop vehicles are estimated
for MOBILE6.  The MOBILE6 basic exhaust emission rates for heavy
duty trucks and 1981 and newer light-duty vehicles and trucks are
discussed in separate reports.

Data files:

R01027a.wpd - describes database fields.
R01027a.dbf - car and truck database.
R01027b.xls - diesel vehicle calculations.
R01027c.xls - motorcycle data.
R01027d.xls - more motorcycle data.
R01027e.xls - motorcycle calculations.
R01027f.xls - gasoline vehicle calculations.
R01027g.xls - Example calculation of engine start fractions.