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:
Aug. 23, 2005
Filed:
Sep. 24, 2004
Justin L. Fulton, Fort Collins, CO (US);
Justin L. Fulton, Fort Collins, CO (US);
Woodward Governor Company, Fort Collins, CO (US);
Abstract
The invention provides a system that controls the air intake pressure of a venturi mixer in an air/fuel ratio control system for gaseous fueled engines to match the fuel vaporizer/regulator output pressure (negative pressure) or to a desired set point of a fuel vaporizer/regulator connected to the fuel inlet of the venturi mixer. A differential pressure control valve in the air intake upstream of the venturi is used, which results in negative pressure vaporizer/regulators being compatible with the constant air/fuel ratio fluidic control principle of the venturi mixer. A differential pressure sensor or estimated differential pressure based on airflow and valve position is used in one embodiment to control the venturi intake air pressure to the desired set point. The set point may be zero or biased by an outer control loop of an engine controller.