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:
Sep. 25, 2007
Filed:
Sep. 26, 2002
Yukihiro Tatsuno, Tsukuba, JP;
Hidetoshi Satake, Ishioka, JP;
Kazuhiro Ichimura, Niihari-gun, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
A prime mover control device of a construction machine according to the present invention includes a hydraulic pump () driven by a prime mover (), a hydraulic traveling motor () driven with pressure oil output from the hydraulic pump (), and a control valve () that controls a flow of the pressure oil from the hydraulic pump () to the hydraulic motor () in response to an operation of an operating member (). The prime mover control device further includes a deceleration detection means () that detects a deceleration operation at the operating member (), a rotation speed detection means () that detects a rotation speed Nm of the hydraulic motor (), and a prime mover rotation speed control means () that executes speed reduction control of the rotation speed of the prime mover () based upon detection results provided by the rotation speed detection means () if the deceleration operation is detected by the deceleration detection means () and controls the rotation speed of the prime mover () in correspondence to an operation of the operating member () which is detected to be other than the deceleration operation.