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:
Nov. 12, 2013
Filed:
May. 02, 2011
Mitsuhiko Kanehama, Kasumigaura, JP;
Kensuke Sato, Ushiku, JP;
Yasuo Okano, Kasumigaura, JP;
Hiroyuki Azuma, Ushiku, JP;
Tsuyoshi Nakamura, Tsuchiura, JP;
Mitsuhiko Kanehama, Kasumigaura, JP;
Kensuke Sato, Ushiku, JP;
Yasuo Okano, Kasumigaura, JP;
Hiroyuki Azuma, Ushiku, JP;
Tsuyoshi Nakamura, Tsuchiura, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
A prime mover revolution speed control system for a hydraulic construction machine sets the revolution speed of the prime mover in accordance with the operating state invoked by an operating command and as a result of a determination of an excavation state so that that the revolution speed of the engine can be increased for a heavy load (speedup) in the excavation state. When the control lever is fully operated in the direction of arm crowding, the control leveris also operated, and first judgment conditions are all met to conclude that an excavation state has begun. During excavation work, when the control leveris subjected to a half or greater operation in the arm crowding direction, second judgment conditions are all met to conclude that the excavation state persists, and the speedup sequence is continued.