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. 15, 2009
Filed:
Apr. 28, 2005
Masami Naruse, Komatsu, JP;
Masami Naruse, Komatsu, JP;
Komatsu Ltd., Tokyo, JP;
Abstract
To provide a hydraulic drive device for a work machine that is capable of ensuring reduction in fuel consumption even in actual work where an operating condition changes every moment. Operating condition identifying unit () for identifying the operating condition and hydraulic pump control system () for controlling absorption torque of hydraulic pump () are provided. When the operating condition identified by operating condition identifying unit () is a specific operating condition, hydraulic pump control system () controls the absorption torque of hydraulic pump () to achieve hydraulic pump absorption torque characteristic line (PLb) matching the absorption torque of hydraulic pump () with output torque of engine () at engine output torque point Mb at which a fuel consumption rate is substantially minimum.