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:
May. 23, 1995
Filed:
Oct. 04, 1993
Hal C Hartsell, Jr, Kernersville, NC (US);
Kenneth L Pope, Walkertown, NC (US);
Gilbarco, Inc., Greensboro, NC (US);
Abstract
A fuel dispensing system includes a main vapor recovery path and a vapor pump to provide a vacuum along the path. Dispensers for dispensing fuel from a storage tank each have a branch conduit having one end adapted to be coupled to a receiving tank, and another end opening into the main vapor path, to provide a branch vapor recovery path. A sensor provides a first electrical signal indicative of the flow of the fuel being delivered, and a vapor flow sensor in the branch conduit supplies a signal indicative of the actual vapor flow. An adjustable valve in the branch conduit has an opening that is adjustable responsive to the magnitude of a control signal to vary the impedance of the vapor recovery path. A controller generates the control signal to control the valve to maintain a desired volume of vapor flow in the branch conduit to draw fuel vapors from the receiving tank into the main path and modifies the control signal to reduce any discrepancy between a calculated vapor flow rate and the actual vapor flow signaled by the vapor flow sensor.