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. 07, 2012
Filed:
Jun. 11, 2009
Qinghui Yuan, Osseo, MN (US);
Chris Schottler, Brooklyn Park, MN (US);
Wade Gehlhoff, Shakopee, MN (US);
Hong Singhania, Prior Lake, MN (US);
QingHui Yuan, Osseo, MN (US);
Chris Schottler, Brooklyn Park, MN (US);
Wade Gehlhoff, Shakopee, MN (US);
Hong Singhania, Prior Lake, MN (US);
Eaton Corporation, Cleveland, OH (US);
Abstract
A flow control valve includes a housing that includes a fluid inlet, a fluid outlet, a first work port and a second work port. The housing defines a spool bore and a pilot spool bore. A main stage spool is disposed in the spool bore. A pilot stage spool is disposed in the pilot spool bore. The pilot stage spool is in selective fluid communication with the main stage spool. A microprocessor includes a controller having a restricted structured controller and a compensation controller. Outputs of the restricted structured controller and the compensation controller are summed to form an electrical signal that is communicated to the pilot stage spool.