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, 2014
Filed:
Sep. 16, 2009
Yoshihiro Takei, Kanagawa, JP;
Yasushi Yamamoto, Kanagawa, JP;
Hiroyuki Kawanishi, Kanagawa, JP;
Isuzu Motors Limited, Tokyo, JP;
Abstract
This invention relates to a feedback control device for controlling the stroke of an actuator stroke driven by a working fluid. The feedback control device for controlling the stroke correctly controls the stroke using a simple means by compensating secular changes in the flow rate control valve that controls the working fluid. The device for controlling the stroke of an actuatoris provided with a single flow rate control valvefor controlling the feed and discharge of the working fluid, and the flow rate control valve is operated to control the stroke by feedback. The flow rate control valvehas a neutral position where the working fluid is neither fed nor discharged, and a flow rate control valve control deviceis provided with a learning devicefor learning variations in the neutral position. The feedback control is executed, i.e., the flow rate control valveis operated by adding a value of the neutral position learned by the learning deviceto the feedback operation amount output by a PID operation unit, whereby a change in the flow rate characteristics caused by secular change is compensated.