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. 11, 2017
Filed:
Apr. 17, 2015
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Shinji Ishihara, Tokyo, JP;
Masatoshi Hoshino, Tsuchiura, JP;
Kentarou Itoga, Tsuchiura, JP;
Hidekazu Moriki, Tsuchiura, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
The hybrid constructions machine has an engine rotation speed sensorA to detect a rotation speed NE of an engine, an engine state determination unitB to determine the state of output torque TE of the engine, a load torque estimation unitC to calculate load torque TP of a hydraulic pump, and an engine assistance limiting unitE to, when the rotation speed NE detected with the engine rotation speed sensorA is equal to or greater than a rotation speed N, and the engine state determination unitB determines that the output torque TE of the enginehas not become minimum torque Tmin, or the load torque TP calculated with the load torque estimation unitC is lower than torque T, limit motive-power assistance with the motor generatorto the engine