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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 10773590 B1

PDFFull Text
Date of Patent:
Sep. 15, 2020

Filed:

Feb. 08, 2017

Work vehicle

Applicant:

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

Inventors:

Masaki Nukii, Ushiku, JP;

Koji Hyodo, Kasumigaura, JP;

Isamu Aoki, Tsukuba, JP;

Tetsuji Tanaka, Abiko, JP;

Assignee:

HITACHI CONSTRUCTION MACHINERY CO., LTD., Tokyo, JP;

Attorney:

Mattingly & Malur, PC

Primary Examiner:

Thomas G Black

Assistant Examiner:

Sara J Lewandroski

Int. Cl.
CPC ...
B60K 17/10 (2006.01); B60W 10/06 (2006.01); B60W 10/103 (2012.01); B60W 10/30 (2006.01); F01N 3/08 (2006.01); F02D 29/04 (2006.01); B60W 10/04 (2006.01); F02D 31/00 (2006.01); F02D 41/02 (2006.01); F01N 9/00 (2006.01); F01N 3/20 (2006.01); F01N 11/00 (2006.01);
U.S. Cl.
CPC ...
B60K 17/10 (2013.01); B60W 10/04 (2013.01); B60W 10/06 (2013.01); B60W 10/103 (2013.01); B60W 10/30 (2013.01); F01N 3/08 (2013.01); F02D 29/04 (2013.01); F02D 31/001 (2013.01); F02D 41/0235 (2013.01); F01N 3/208 (2013.01); F01N 9/00 (2013.01); F01N 11/00 (2013.01); F01N 2590/08 (2013.01); F01N 2610/02 (2013.01); F01N 2610/1406 (2013.01); F01N 2900/0416 (2013.01); F01N 2900/08 (2013.01); F01N 2900/10 (2013.01); F01N 2900/12 (2013.01); F01N 2900/1814 (2013.01); F02D 2200/101 (2013.01); Y02A 50/2325 (2018.01);
Abstract

The present invention relates to a work vehicle including an engine, a hydraulic pump, a hydraulic motor to drive wheels, an HST circuit in which the hydraulic pump and the hydraulic motor are connected to each other in the form of a closed circuit, a reducing agent sensor that detects the state of a reducing agent used to clean exhaust gas from the engine, and an engine restrictor that restricts the rotational speed of the engine based on the output from the reducing agent sensor, and the work vehicle further includes a control unit that changes the tilting angle of the hydraulic pump or the hydraulic motor independently of the rotational speed of the engine to a tilting angle associated with minimum travel drive force necessary for self-travel of the work vehicle when the control unit determines that the engine restrictor has restricted the rotational speed of the engine.

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