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:
Jun. 22, 1976
Filed:
Jul. 03, 1974
Robert D Englert, Corona Del Mar, CA (US);
Lester Porter Berriman, Irvine, CA (US);
Kenneth P Armstrong, Lakewood, CA (US);
Douglas A Roe, Gilbert, AZ (US);
Dresser Industries, Inc., Dallas, TX (US);
Abstract
A combustible air-liquid fuel mixture having a substantially constant air-to-fuel ratio is produced for delivery to the intake manifold of an engine. Air is passed through a fluid flow device having a variable area throat zone to increase the velocity of the air to sonic, and the area of the throat zone is varied in correlation with operating demands imposed upon the engine for which the mixture is produced. Liquid fuel is metered from a supply into the air stream at or before the throat zone in direct proportion to the cross-sectional area of the throat zone. The pressure of the high velocity air stream is sensed at a point where it bears a predictable relationship to atmospheric pressure, and the rate of fuel delivered into the air stream is adjusted in response to changes in the air pressure sensed so that the air-to-fuel ratio of the mixture is maintained substantially constant. Due to the particular design of the fluid flow device, air at sonic velocity passes through the throat zone over substantially the entire operating range of the engine down to low manifold vacuum levels. During the relatively brief subsonic mode of operation when the manifold vacuum levels are quite low, the fluid flow device functions as a metering venturi to introduce the liquid fuel into the varying velocity air stream.