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:
Feb. 20, 2001
Filed:
May. 10, 1999
James Richard Jamrog, Novi, MI (US);
Douglas Alan Stukenborg, Durham, NC (US);
Ford Global Technologies, Inc., Dearborn, MI (US);
Abstract
A system and method for controlling the purging of vapor from a carbon canister based on identification of a vacuum loss in the manifold. The system and method of the present invention store target values for the tank pressure and purge duty cycle. A differential pressure between current system levels and target levels is calculated and compared to predetermined critical levels. If the currently calculated level exceeds a calibrated threshold value, a countdown timer is set and reset until the calculated differential drops below the threshold value. If the engine air mass drops below a critical calibrated air mass value before the timer has completed counting down, the purge flow is reset and slowly reintroduced to prevent rich engine air/fuel ratio conditions.