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:
Nov. 03, 2009
Filed:
Mar. 01, 2007
Etsujiro Imanishi, Kobe, JP;
Naoki Sugano, Kobe, JP;
Takao Nanjo, Kobe, JP;
Hidekazu Oka, Hiroshima, JP;
Etsujiro Imanishi, Kobe, JP;
Naoki Sugano, Kobe, JP;
Takao Nanjo, Kobe, JP;
Hidekazu Oka, Hiroshima, JP;
Kobelco Construction Machinery Co., Ltd., Hiroshima-shi, JP;
Abstract
With respect to a method of controlling a pump flow rate of a hydraulic pump, a method having a small flow rate command value is selected between a pressure feedback control for controlling the pump flow rate based on a set pressure (a cutoff pressure) and a pump pressure, and, an ordinary control for controlling the pump flow rate based on operation information, and in a case that the pressure feedback control is selected, a flow rate increasing control for increasing the flow rate command value after the case with the passage of time is performed.