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:
Oct. 28, 2008
Filed:
Aug. 09, 2004
Hiroshi Sawada, Neyagawa, JP;
Hiroshi Sawada, Neyagawa, JP;
Komatsu Ltd., Tokyo, JP;
Abstract
A hydraulic drive control device which is capable of translating the effect of oil pressure loss reduction into the effect of fuel consumption reduction that is very real to the user. The hydraulic drive control device has (i) a driving hydraulic circuit for driving a hydraulic actuator by supplying pressure oil to or draining it from the hydraulic actuator through control valves, the pressure oil being discharged from a hydraulic pump driven by an engine and (ii) a quick return circuit for directly flowing part of hydraulic oil discharged from the hydraulic actuator back to a tank, while the hydraulic actuator being driven. The hydraulic drive control device also includes an engine controller for controlling the output of the engine such that the output of the engine is restricted when the quick return circuit is opened.