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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.:

US 10851521 B1

PDFFull Text
Date of Patent:
Dec. 01, 2020

Filed:

Feb. 21, 2018

Construction machine

Applicant:

Hitachi Construction Machinery Co., Ltd., Tokyo, JP;

Inventors:

Taiki Aizawa, Tsuchiura, JP;

Shinji Nishikawa, Kasumigaura, JP;

Kouichi Shibata, Kasumigaura, JP;

Assignee:

Hitachi Construction Machinery Co., Ltd., Tokyo, JP;

Attorney:

Crowell & Moring LLP

Primary Examiner:

Darlene P Condra

Int. Cl.
CPC ...
E02F 9/22 (2006.01); E02F 3/43 (2006.01); B60K 6/485 (2007.10); E02F 3/42 (2006.01); F04B 49/06 (2006.01); F15B 11/16 (2006.01); B60K 6/36 (2007.10); B60W 10/10 (2012.01); B60W 20/00 (2016.01); F04B 35/00 (2006.01); E02F 9/20 (2006.01);
U.S. Cl.
CPC ...
E02F 9/2235 (2013.01); B60K 6/36 (2013.01); B60K 6/485 (2013.01); B60W 10/10 (2013.01); B60W 20/00 (2013.01); E02F 3/425 (2013.01); E02F 3/435 (2013.01); E02F 9/20 (2013.01); E02F 9/22 (2013.01); E02F 9/2271 (2013.01); E02F 9/2296 (2013.01); F04B 35/002 (2013.01); F04B 49/06 (2013.01); F04B 49/065 (2013.01); F15B 11/16 (2013.01); B60Y 2200/92 (2013.01); F15B 2211/20523 (2013.01); F15B 2211/6651 (2013.01); Y02T 10/62 (2013.01);
Abstract

A hydraulic excavator () includes a hydraulic pump () driven by an engine (), an electromagnetic proportional valve () for hydraulic pump that adjusts pump torque of the hydraulic pump () in response to a pump torque target value (Tp), a hydraulic actuator operated by a delivery pressure of the hydraulic pump (), a motor generator () connected to the engine (), and a controller () configured to calculate the pump torque target value (Tp). The controller () acquires a pump torque adjustment amount (Qadj) based on a deviation (ΔAH) between a current integrating value (AH) acquired by integrating a value of a current flowing into the motor generator () when the hydraulic actuator is driven and a current integrating reference value (AH).

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