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:
Jan. 04, 2005
Filed:
Feb. 03, 2003
Hidekazu Oka, Hiroshima, JP;
Kazuhiko Fujii, Hiroshima, JP;
Naoki Sugano, Kobe, JP;
Etsujiro Imanishi, Kobe, JP;
Hidekazu Oka, Hiroshima, JP;
Kazuhiko Fujii, Hiroshima, JP;
Naoki Sugano, Kobe, JP;
Etsujiro Imanishi, Kobe, JP;
Kobelco Construction Machinery Co., Ltd., Hiroshima, JP;
Abstract
The present invention relates to a control system and method for a hydraulic working machine characterized by having a construction wherein a flow discharge control valve is disposed in a discharge-side pipe line of a main flow control valve, the amount of operation of an operating lever is converted to a pilot pressure by a remote controlled valve, the pilot pressure is then input to a controller and is calculated into a pressure change speed as operation speed, in a pressure change speed calculator, further, the operation speed is calculated into an electromagnetic valve current in an electromagnetic valve current calculator, then the electromagnetic proportional valve current is output to an electromagnetic proportional valve from a command unit, and the degree of opening of the discharge flow control valve is controlled with a secondary pressure in the electromagnetic proportional valve. According to this construction, it is possible to diminish impact and vibration which occur when there is performed a sudden operation, and also possible to improve the operability for braking and stopping an actuator.