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:
Dec. 09, 2003
Filed:
Apr. 02, 2002
Applicant:
Inventor:
Shinji Kuru, Mie, JP;
Assignee:
Yasunaga Corporation, Ueno, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01B 7/00 ; G01F 3/04 ;
U.S. Cl.
CPC ...
G01B 7/00 ; G01F 3/04 ;
Abstract
A hydraulic system includes position sensors that are provided together with solenoid valves in fluid passages extending between a working fluid source and hydraulic actuators. Each position sensor is comprised of two gears disposed in the fluid passage so as to be rotatable by the flow of working fluid, and two sensing elements each disposed to face either one of the gears. A controller determines the operating position of each actuator based on sensor outputs that are out of phase with each other and are generated by the sensing elements each time the gears rotate for a predetermined angle.