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:
Oct. 21, 2008
Filed:
Jan. 02, 2004
Applicants:
Joseph J. Schottler, Crystal, MN (US);
John C. Stafney, Clearwater, MN (US);
Inventors:
Joseph J. Schottler, Crystal, MN (US);
John C. Stafney, Clearwater, MN (US);
Assignee:
Sauer-Danfoss Inc., Ames, IA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G05D 7/00 (2006.01); G05D 11/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method of yielding the average current in a PWM driven coil for an electrohydraulic valve. The method includes transmitting a feedback signal into a Finite Impulse Response filter to take multiple signal samples in order to calculate and average value of current within one cycle. This average value is transmitted to an algorithm that generates a pulse width signal that drives the coil of the electrohydraulic valve in the next system cycle.