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:
Sep. 11, 2012
Filed:
Mar. 13, 2008
Yoshihiro Takei, Kanagawa, JP;
Yasushi Yamamoto, Kanagawa, JP;
Hiroyuki Kawanishi, Kanagawa, JP;
Isuzu Motors Limited, Tokyo, JP;
Abstract
A clutch control device for vehicle is equipped with a clutch actuator driven by a working fluid, and works to correctly control the rate of connection of the clutch by a simple means compensating secular change of a flow rate control valve that controls the working fluid. The clutch control device has a single flow rate control valvefor controlling the feed and discharge of the working fluid to change the stroke of the clutch actuator. The flow rate control valvehas a neutral position at where feed and discharge of the working fluid is stopped. A flow rate control valve control deviceis provided with a learning devicefor learning the neutral position. To control the stroke, the flow rate control valve control devicecorrects the amount of electric current to a coilof an electromagnetic solenoid based on a value learned by the learning deviceand compensates a change in the flow rate characteristics caused by secular change. The neutral position is learned when the rate of change in the stroke is substantially zero.