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:
Apr. 06, 2004
Filed:
Mar. 14, 2002
Hiroshi Watanabe, Ushiku, JP;
Hidefumi Ishimoto, Tsuchiura, JP;
Hiroshi Ogura, Ryugasaki, JP;
Hiroyuki Adachi, Tsuchiura, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
A system having a monitoring function in addition to a control function is able to suppress an increase in the amount of data communication and the communication frequency via a common communication line, and is flexibly adaptable for the addition of a new function without causing mutual interference between control data and monitor data. In particular, a hydraulic excavator includes a first control unit for a prime mover a second control unit for a hydraulic pump a third control unit for control valves and and first and second monitor units A first common communication line for control and a second common communication line for monitoring are further provided as common buses for data communication.