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:
Nov. 12, 2019
Filed:
Jan. 12, 2017
Applicant:
Komatsu Ltd., Tokyo, JP;
Inventors:
Assignee:
Komatsu LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F15B 19/00 (2006.01); F01P 7/04 (2006.01); F04B 49/20 (2006.01); F15B 21/02 (2006.01); F04B 51/00 (2006.01); E02F 9/20 (2006.01); E02F 9/26 (2006.01);
U.S. Cl.
CPC ...
F15B 19/005 (2013.01); F01P 7/044 (2013.01); F04B 49/20 (2013.01); F04B 51/00 (2013.01); F15B 21/02 (2013.01); E02F 9/2054 (2013.01); E02F 9/267 (2013.01);
Abstract
A fan drive system includes a hydraulic pump, a hydraulic motor that rotates a fan on the basis of hydraulic oil supplied from the hydraulic pump, a data acquisition unit that acquires an actual fan speed of the fan, a target amount determination unit that determines a target fan speed of the fan on the basis of a state of an object to be cooled of the fan, and an estimating unit that estimates a state of the hydraulic pump or a state of the hydraulic motor on the basis of a change of a feedback amount that indicates a difference between the target fan speed and the actual fan speed.