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:
May. 02, 2006
Filed:
Mar. 22, 2004
Fumio Ishibashi, Osaka, JP;
Yukio Kubota, Osaka, JP;
Yasuo Noma, Osaka, JP;
Akifumi Kuroda, Osaka, JP;
Fumio Ishibashi, Osaka, JP;
Yukio Kubota, Osaka, JP;
Yasuo Noma, Osaka, JP;
Akifumi Kuroda, Osaka, JP;
Yanmar Agricultural Equipment Co., Ltd., Osaka, JP;
Yanmar Co., Ltd., Osaka, JP;
Abstract
A hydraulic transmission () has an electric actuator () for changing its output/input rotation speed ratio. A controllerof the actuator memorizes a command current value to the actuator supposing that load is not applied on the hydraulic transmission, and calculates a value of load applied on the hydraulic transmission by calculating a difference between an actual command current value to the actuator and the memorized command current value. A command current value is compensated based on the value of load, and the actuator receives feedback to be controlled. A vehicle may have a differential mechanism (), which combines rotation powers on input side and output side of the hydraulic transmission. A detector () detects rotation speed of a main speed change output shaft () serving as an output shaft of the differential mechanism. If the detected rotation speed differs from target rotation speed of the shaft () determined based on operation of a speed change operation tool, the actuator is forcedly controlled. This difference is supposed to be caused by load applied on the hydraulic transmission, whereby the load is calculated.