Apparatus and method for determining evaporative emissions

Details Apparatus and method for determining evaporative emissions Apparatus and method for determining evaporative emissions

2006-05-16

2006-05-16

Garber, Charles (Department: 2856)

Measuring and testing

With fluid pressure

C073S001060

Reexamination Certificate

active

07043963

ABSTRACT:
A sealed housing evaporative determination (SHED) apparatus and method for practically zero emission vehicles (PZEV) provides periodic sampling of ambient air within a substantially air-tight testing structure enclosing a vehicle under test. Pressure drops within the testing structure are compensated by injecting air substantially free of hydrocarbons into the testing structure. Pressure increases within the testing structure are reduced by withdrawing ambient air from the testing structure. Hydrocarbon content of any withdrawn ambient air is determined from the latest sample, and cumulative evaporative emissions are adjusted accordingly.

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patent: 6575012 (2003-06-01), Aronsson et al.
patent: 6865926 (2005-03-01), O'Brien et al.

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