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. 10, 2013
Filed:
Sep. 28, 2009
Eiji Ishibashi, Komatsu, JP;
Masayuki Mukaino, Komatsu, JP;
Shigeru Yamamoto, Hirakata, JP;
Yoshitaka Onodera, Hiratsuka, JP;
Takao Ishihara, Hirakata, JP;
Eiji Ishibashi, Komatsu, JP;
Masayuki Mukaino, Komatsu, JP;
Shigeru Yamamoto, Hirakata, JP;
Yoshitaka Onodera, Hiratsuka, JP;
Takao Ishihara, Hirakata, JP;
Komatsu Ltd., Tokyo, JP;
Abstract
A control device controls a hydrostatic transmission vehicle having a hydrostatic transmission with a variable displacement pump and a variable displacement hydraulic motor. The control device is configured to set a set vehicle speed based on a forward/rearward travel command and a gear stage command instructed by an operator, to set an upper limit of the engine speed with respect to the set vehicle speed for limiting the upper limit of the engine speed to a predetermined partial engine speed set to be lower than a high idle engine speed when the set vehicle speed is in a preliminarily set low and intermediate speed range, and to control respective displacements of the variable displacement pump and the variable displacement hydraulic motor based on the set vehicle speed for allowing a vehicle speed to reach the set vehicle speed even when the engine is rotated at the partial engine speed.