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:
Jun. 09, 2015
Filed:
Oct. 30, 2012
Fujitsu Limited, Kawasaki-shi, JP;
Kazuhiro Nitta, Kawasaki, JP;
Akira Ueda, Yokohama, JP;
Atsushi Yamaguchi, Kawasaki, JP;
Hiroyuki Furuya, Kawasaki, JP;
Akihiro Otsuka, Yokohama, JP;
FUJITSU LIMITED, Kawasaki, JP;
Abstract
A blower control device changes a PQ characteristic in a second table so that an operating point (Q, P) on the PQ characteristic in the second table agrees with an operating point (Q, P) on a PQ characteristic in a first table. At this time, the blower control device changes the PQ characteristic in the second table at a rate based on Qand Q. Furthermore, the blower control device changes a load noise characteristic in the second table at a rate based on Qand Q. Then, the blower control device calculates load noise corresponding to the operating point (Q, P) with respect to each rotation frequency ratio from the changed load noise characteristic. And then, the blower control device determines a rotation frequency ratio corresponding to the lowest load noise as a rotation frequency ratio at which a plurality of fans is rotated.