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:
Jun. 14, 2016
Filed:
May. 21, 2013
Kobelco Construction Machinery Co., Ltd., Hiroshima-shi, JP;
Masayuki Komiyama, Hiroshima, JP;
KOBELCO CONSTRUCTION MACHINERY CO., LTD., Hiroshima-shi, JP;
Abstract
In a working machine having an upper slewing body rotated by a slewing electric motor, a controller outputs a command for switching a communication valve, and a command for specifying a torque of the slewing electric motor. The controller includes an abnormal-switching detection section which detects occurrence of abnormal switching in the communication valve, wherein the controller (i) determines, as a target value, a pressure which would be generated in the hydraulic motor if the communication valve was absent, or a torque determined based on the pressure, based on an operation state of a slewing operation device and a slewing state of the upper slewing body; (ii) determines, as an actual value, a pressure actually generated in the hydraulic motor or a torque determined based on the pressure; and (iii) outputs the torque command on the basis of a value obtained by subtracting the actual value from the target value.