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:
Sep. 30, 2014
Filed:
Aug. 19, 2011
Kazunori Suzuki, Hitachinaka, JP;
Ryo Sato, Hitachinaka, JP;
Keiji Hanzawa, Mito, JP;
Hitachi Automotive Systems, Ltd., Hitachinaka-shi, JP;
Abstract
Provided is a highly accurate, highly reliable gas flow rate measurement device that provides an enlarged temperature range over which the resolution at a high temperature and at a low temperature can be increased to achieve high accuracy no matter whether the characteristics of a gas temperature detection element are nonlinear. The gas flow rate measurement device includes a plurality of resistors that are disposed in a gas flow path, a gas flow rate detection circuit that outputs a gas flow rate detection signal in accordance with the flow rate of a gas flowing in the gas flow path by detecting a current flowing in the resistors or by detecting a voltage generated in accordance with the current, and a gas temperature detection elementthat detects the temperature of the gas in the gas flow path. The gas flow rate detection circuit includes signal conversion means for converting a signal output from the gas temperature detection element to a signal that has a predetermined maximum output and a predetermined minimum output and is linear within a predetermined temperature range.