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:
Mar. 22, 2016
Filed:
May. 16, 2011
Takenori Hiroki, Ibaraki-ken, JP;
Manabu Edamura, Kasumigaura, JP;
Toshihiko Ishida, Hitachi, JP;
Manabu Sugiura, Tsuchiura, JP;
Hidetoshi Satake, Ishioka, JP;
Kouji Ishikawa, Kasumigaura, JP;
Takatoshi Ooki, Kasumigaura, JP;
Shinji Nishikawa, Kasumigaura, JP;
Takenori Hiroki, Ibaraki-ken, JP;
Manabu Edamura, Kasumigaura, JP;
Toshihiko Ishida, Hitachi, JP;
Manabu Sugiura, Tsuchiura, JP;
Hidetoshi Satake, Ishioka, JP;
Kouji Ishikawa, Kasumigaura, JP;
Takatoshi Ooki, Kasumigaura, JP;
Shinji Nishikawa, Kasumigaura, JP;
HITACHI CONSTRUCTION MACHINERY CO., LTD., Tokyo, JP;
Abstract
A hybrid construction machine is capable of performing satisfactory operations even when trouble occurs that disables the electric motor from outputting torque. The hybrid construction has both a hydraulic motor and an electric motor driving the swing structure and a controller for switching between a hydraulic/electric hybrid swing mode (using both the hydraulic motor and the electric motor) and a hydraulic-alone swing mode (using only the hydraulic motor). The switching is executed while achieving satisfactory operability and performance in each mode. Normally, an energy saving operation is performed in the hydraulic/electric hybrid swing mode. When the electric amount of an electricity storage device has gone out of a prescribed range or an abnormality has occurred in an electric system (e.g., failure of an inverter), the swing mode is switched to the hydraulic-alone swing mode so that driving with normal braking torque is possible by the hydraulic motor alone.