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:
Jun. 09, 2009
Filed:
Nov. 11, 2005
Kentaro Itoga, Abiko, JP;
Kazunori Nakamura, Tsuchiura, JP;
Tsuyoshi Nakamura, Tsuchiura, JP;
Motoyuki Yabuuchi, Kasumigaura, JP;
Kentaro Itoga, Abiko, JP;
Kazunori Nakamura, Tsuchiura, JP;
Tsuyoshi Nakamura, Tsuchiura, JP;
Motoyuki Yabuuchi, Kasumigaura, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
A traveling working vehicle maintains fuel economy while ensuring a sufficient work rate in heavy-load work. A torque control regulatorcontrols the absorption torque of a hydraulic pumpto ensure that it does not exceed a preset maximum absorption torque, and an accelerator pedalcommands a target revolution speed of an engine. Revolution speed deviation computing sectionsand, a modification torque computing section, a modification revolution speed computing section, speed ratio computing sectionsand, traveling state determining sectionsand, and working state determining sectionsanddetermine an operating state of the traveling working vehicle. Both the pump base torque of the hydraulic pumpand the target revolution speed of the engineare modified depending on the determination result of the state determining sections.