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:
Sep. 26, 1995
Filed:
Sep. 17, 1993
Applicant:
Inventors:
Jonathan B Gamble, Chichester, GB;
Bradley D Riedle, Clinton Township, MI (US);
Assignee:
Trinova Limited, Hampshire, GB;
Primary Examiner:
Int. Cl.
CPC ...
F15B / ;
U.S. Cl.
CPC ...
137-1 ; 13762564 ; 251 3001 ;
Abstract
A method and apparatus for controlling a two-stage valve using a closed-loop control system, the system including a variable gain element, the method involving continually performing the steps of estimating the flow gain of the pilot stage of the valve; comparing the estimated flow gain with a reference flow gain; and in response to said comparison step, adjusting the gain of the variable gain element to maintain a substantially constant closed-loop gain.