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:
Apr. 15, 2014
Filed:
Mar. 13, 2012
Manabu Edamura, Kasumigaura, JP;
Kouji Ishikawa, Kasumigaura, JP;
Manabu Sugiura, Tsuchiura, JP;
Takenori Hiroki, Ibaraki-ken, JP;
Toshihiko Watanabe, Ushiku, JP;
Manabu Edamura, Kasumigaura, JP;
Kouji Ishikawa, Kasumigaura, JP;
Manabu Sugiura, Tsuchiura, JP;
Takenori Hiroki, Ibaraki-ken, JP;
Toshihiko Watanabe, Ushiku, JP;
Hidetoshi Satake, Ishioka, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
Disclosed is a hybrid construction machine that includes a control device and an auxiliary control device. The control device switches between a hydraulic/electric complex swing mode in which both the electric motor and the hydraulic motor are driven to drive the swing structure by using the sum of the torque of the electric motor and the torque of the hydraulic motor; and a hydraulic-only swing mode in which only the hydraulic motor is driven to drive the swing structure by using only the torque of the hydraulic motor. The auxiliary control device includes a monitoring controller that is connected to the control device and to the electric motor to monitor the temperature or electrical leakage in the electric motor as a substitute controller for the power control unit or the electrical storage device when the power control unit or the electrical storage device is removed due to a fault.