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:
Dec. 23, 2003
Filed:
Dec. 28, 2001
Kobelco Construction Machinery Co., Ltd., Hiroshima, JP;
Abstract
A drive apparatus comprises an engine, a hydraulic pump, an electric motor concurrently serving as a generator, a battery, a first control device that charges the battery with the electric power generated by the electric motor concurrently serving as a generator and drives the electric motor concurrently serving as a generator using the electric power of the battery, and a controller. When the input of the hydraulic pump is smaller than the output of the engine, the engine is operated the set number of revolutions and the number of high idle revolutions. And, when the input of the hydraulic pump is larger than the output of the engine, the input of the hydraulic pump is reduced and the electric motor is operated in the electric motor action, whereby the engine output can be supplemented and the engine can be operated in the set number of revolutions.