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. 11, 2012
Filed:
Jan. 09, 2008
Naritoshi Ohtsukasa, Hiratsuka, JP;
Naritoshi Ohtsukasa, Hiratsuka, JP;
Komatsu Ltd., Tokyo, JP;
Abstract
The object of the present invention is to allow an operator to easily perform desired operations with high hydraulic efficiency, without an increase in difficulty of performing operations. A hydraulic drive apparatus of the present invention includes a pump control unitthat includes: a pump reference command value setting unitthat sets a pump reference command value for a hydraulic pumpin accordance with the engine speed of an engine; a pump correction command value calculating unitthat sets a pump command value by determining an inching rate in accordance with the amount of operation when an inching operation is performed, and correcting the pump reference command value in accordance with the inching rate; and a pump control command value setting unitthat sets a pump control command value for controlling the capacity of the hydraulic pump, based on the pump command value set by the pump correction command value calculating unit