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:
Jan. 01, 2002
Filed:
Apr. 03, 2000
Hiroshi Watanabe, Ushiku, JP;
Hiroshi Ogura, Ryugasaki, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
A hydraulic excavator comprises a prime mover , an excavating device , a hydraulic pump rotationally driven by the prime mover, actuators for driving the working device, and control levers for operating control valves for controlling a hydraulic fluid supplied from the hydraulic pump to the actuators. Control units and a display unit are provided on the hydraulic excavator, the control units being associated with the prime mover, the excavating device, the hydraulic pump and the control levers. The control units and the display unit are interconnected via a common communication line to transmit and receive data among them. The control units each include minimum processing means capable of performing computation by using an initial value and executing least necessary processing by itself when no data is transmitted via the communication line. In an electronic control system for a construction machine including a plurality of control units interconnected via a common communication line, therefore, system change including addition, exclusion and replacement of one or more control units can be easily realized.