The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 25, 2008
Filed:
Feb. 28, 2005
Bruce R Kohn, Tucson, AZ (US);
Bruce R Kohn, Tucson, AZ (US);
SysTech International, LLC, Ann Arbor, MI (US);
Abstract
A method and apparatus for measuring leakage of a vehicle fuel system includes providing an apparatus having a gas source, a pressure meter and a reference orifice and connecting the apparatus to the fuel system. The fuel system is pressurized with the source. A first set of pressure measurements is obtained using the pressure meter with gas escaping the fuel system through leakage of the fuel system. A second set of pressure measurements is obtained with gas escaping the fuel system through leakage of the fuel system and through the reference orifice. An effect of fuel vapor pressure created by fuel in the vehicle fuel system may be measured. A leakage parameter of the fuel system may be calculated from the first and second sets of pressure measurements including compensating for the effect of fuel vapor pressure.