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:
Feb. 24, 2009
Filed:
Jul. 30, 2004
Tsuyoshi Nakamura, Ibaraki-ken, JP;
Genroku Sugiyama, Ryuugasaki, JP;
Kazunori Nakamura, Tsuchiura, JP;
Toichi Hirata, Ushiku, JP;
Tsuyoshi Nakamura, Ibaraki-ken, JP;
Genroku Sugiyama, Ryuugasaki, JP;
Kazunori Nakamura, Tsuchiura, JP;
Toichi Hirata, Ushiku, JP;
Hitachi Construction Machinery Co., Ltd, Tokyo, JP;
Abstract
A traveling hydraulic working machine has a target revolution speed of an engine commanded by an input and sensors for detecting an operating situation of a hydraulic actuator and an operating situation of a traveling system. A prime-mover revolution speed control modifies the target revolution speed of the prime mover when the operating situation of the hydraulic actuator and the operating situation of the traveling system come into respective particular states, and controls the revolution speed of the prime mover, With the traveling hydraulic working machine, in the combined operation of traveling and working a hydraulic actuator, work can be performed on the basis of the engine revolution speed intended by an operator. When a working load varies, the engine revolution speed is automatically controlled.