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:
Jan. 11, 2022
Filed:
Mar. 08, 2017
Applicant:
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Inventors:
Assignee:
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F02D 29/04 (2006.01); E02F 9/20 (2006.01); E02F 3/32 (2006.01); E02F 9/22 (2006.01);
U.S. Cl.
CPC ...
E02F 9/2075 (2013.01); E02F 9/2004 (2013.01); E02F 9/2091 (2013.01); E02F 3/32 (2013.01); E02F 9/2221 (2013.01); E02F 9/2285 (2013.01); E02F 9/2292 (2013.01); E02F 9/2296 (2013.01);
Abstract
A low idling controller (A) switches an idling state flag from 'clear' to 'set' upon detecting a non-operation of an operating device (). A rotational speed controller (B) switches a rotational speed command from a set rotational speed by a rotational speed command device () to a low idling rotational speed based upon the idling state flag. At this time, an engine () drives in the low idling rotational speed lower than the set rotational speed. A gate controller () stops switching of an inverter () while the low idling controller (A) is lowering a rotational speed of the engine ().