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. 10, 2015
Filed:
Mar. 22, 2012
Takatoshi Ooki, Kasumigaura, JP;
Yusuke Kajita, Ushiku, JP;
Hidetoshi Satake, Ishioka, JP;
Seiji Ishida, Hitachinaka, JP;
Shiho Izumi, Hitachinaka, JP;
Kouji Ishikawa, Kasumigaura, JP;
Shinya Okumura, Kasumigaura, JP;
Manabu Edamura, Kasumigaura, JP;
Takatoshi Ooki, Kasumigaura, JP;
Yusuke Kajita, Ushiku, JP;
Hidetoshi Satake, Ishioka, JP;
Seiji Ishida, Hitachinaka, JP;
Shiho Izumi, Hitachinaka, JP;
Kouji Ishikawa, Kasumigaura, JP;
Shinya Okumura, Kasumigaura, JP;
Manabu Edamura, Kasumigaura, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
A hybrid construction machine drives the upper swing structure using a hydraulic motor and an electric motor together and is capable of regenerating the energy of the upper swing structure in deceleration or stopping into electric power and using the regenerated electric power for assisting the hydraulic motor for driving the upper swing structure. The opening area characteristics of a meter-out restrictor and a bleed-off restrictor of a swing directional control valve are set to become larger than for construction machines driving the upper swing structure with the hydraulic motor alone. Torque of the electric motor is controlled so that the total sum of the actual torque occurring in the hydraulic and electric motors in deceleration or acceleration of the hydraulic motor equals the torque occurring when the opening area of the meter-out restrictor or the bleed-off restrictor is set at the prescribed opening area.