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:
Jan. 21, 2003
Filed:
Feb. 26, 2001
Applicant:
Inventors:
Kazuyasu Asakura, Hitachi, JP;
Shouei Takahashi, Hitachi, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F02C 6/18 ; F02C 7/232 ;
U.S. Cl.
CPC ...
F02C 6/18 ; F02C 7/232 ;
Abstract
An object of the present invention is to provide a control system and a control method for servo valve which can stably continue to control a servo valve when a break occurs in servo coils of a servo valve having a plurality of servo coils. In the present invention, voltages of a plurality of servo coils A, B, C are detected by wire break detecting means individually provided to servo amplifiers A, B, C. The servo amplifiers A, B, C performs wire break detection and wire break compensation.