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:
May. 13, 2003
Filed:
Jun. 26, 2001
Komatsu Ltd., Tokyo, JP;
Abstract
The present invention provides for a control system of a hydraulic construction machine for enhancing a responsibility and stability of a work implement movement. The control system comprises a variable displacement type hydraulic pump , a hydraulic actuator driven by hydraulic fluid delivered from the pump , a flow control valve for controlling the flow rate of the hydraulic fluid to the hydraulic actuator in response to a travel amount of an operating lever , the variable bleed valve disposed in the bleed-off hydraulic circuit through which exhausts the hydraulic fluid supplied to the hydraulic actuator and a controller for controlling the flow rate through the variable bleed valve . The controller of the variable bleed valve includes a storage unit for storing multiple function as an opening area function which determines the optimum amount of the exhausted fluid through the variable bleed valve in response to the amount of an external command signal through a monitor