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:
Feb. 16, 2016
Filed:
Dec. 23, 2010
Byung IL Kang, Gyeonggi-do, KR;
Byung Il Kang, Gyeonggi-do, KR;
Doosan Infracore Co., Ltd., Incheon, KR;
Abstract
Disclosed is a system for driving a boom of a hybrid excavator, and a method for controlling the same. The system comprises: an electric motor; a capacitor for storing electricity generated by the electric motor; a hydraulic pump motor driven by the electric motor to supply working oil to a boom; a boom control valve having a closed circuit selectively connecting/disconnecting a discharge line and an inlet line of the hydraulic pump motor to/from a head or a load of the boom; a main pump arranged separately from the motor to supply working oil; a boom-assisting valve connecting discharge lines of the main pump and the hydraulic pump motor to combine discharged working oil; and a control unit controlling the electric motor, the hydraulic pump motor, and the boom control valve. The system minimizes energy loss during excavation, ensures performance of the boom, and recovers regenerative energy from the boom.