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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 10458097 B1

PDFFull Text
Date of Patent:
Oct. 29, 2019

Filed:

Sep. 02, 2016

Hybrid work machine

Applicant:

Hitachi Construction Machinery Co., Ltd., Taito-ku, Tokyo, JP;

Inventors:

Hiroaki Amano, Tsukuba, JP;

Shinya Imura, Toride, JP;

Ryouhei Yamashita, Tsuchiura, JP;

Shinji Ishihara, Ushiku, JP;

Shinji Nishikawa, Kasumigaura, JP;

Masafumi Hita, Kasumigaura, JP;

Assignee:

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

Attorney:

Crowell & Moring LLP

Primary Examiner:

Thomas E Lazo

Int. Cl.
CPC ...
E02F 9/20 (2006.01); B60K 6/36 (2007.10); B60K 6/48 (2007.10); B60W 10/26 (2006.01); F04B 49/06 (2006.01); F04B 49/12 (2006.01); B60K 6/28 (2007.10); B60K 6/485 (2007.10); F04B 49/08 (2006.01); F04B 49/10 (2006.01); E02F 9/22 (2006.01); B60L 50/16 (2019.01); B60L 1/00 (2006.01); B60W 20/13 (2016.01);
U.S. Cl.
CPC ...
E02F 9/2075 (2013.01); B60K 6/28 (2013.01); B60K 6/36 (2013.01); B60K 6/48 (2013.01); B60K 6/485 (2013.01); B60L 1/003 (2013.01); B60L 50/16 (2019.02); B60W 10/26 (2013.01); E02F 9/2235 (2013.01); F04B 49/06 (2013.01); F04B 49/065 (2013.01); F04B 49/08 (2013.01); F04B 49/103 (2013.01); F04B 49/106 (2013.01); F04B 49/12 (2013.01); B60L 2200/40 (2013.01); B60W 20/13 (2016.01); B60Y 2200/41 (2013.01); B60Y 2200/92 (2013.01); F04B 2203/0208 (2013.01); F04B 2203/0209 (2013.01); F04B 2205/05 (2013.01); F04B 2205/09 (2013.01);
Abstract

A hybrid work machine that can suppress excessive limiting on pump absorption power even in a situation in which supply of electric power to an electric motor is limited is provided. The hybrid work machine includes: an enginean assist generator motorconnected to the enginein such a manner that a torque can be transmitted to the enginean electric storage devicethat supplies electric power to the assist generator motora monitoring devicethat monitors the electric storage deviceand that acquires electric storage device information; a hydraulic pumpdriven by the engineand the assist generator motorand a pump regulatorthat regulates a delivery flow rate of the hydraulic pumpThe hybrid work machine includes: an increasing rate computing sectionthat computes an allowable increasing rate r in response to the electric storage device information for pump absorption power; a limited power computing sectionthat computes a limited value WPlim of the pump absorption power on the basis of the allowable increasing rate r; and a pump control sectionthat controls the delivery flow rate of the hydraulic pumpin response to the limited pump power WPlim.

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