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. 19, 2006
Filed:
Aug. 17, 2004
Hiroshi Nakamura, Kyoto, JP;
Masayuki Adachi, Kyoto, JP;
Ichiro Asano, Kyoto, JP;
Jiro Senda, Kyoto, JP;
Shintaro Aoki, Kyoto, JP;
Hiroshi Nakamura, Kyoto, JP;
Masayuki Adachi, Kyoto, JP;
Ichiro Asano, Kyoto, JP;
Jiro Senda, Kyoto, JP;
Shintaro Aoki, Kyoto, JP;
Horiba, Ltd., Kyoto, JP;
Abstract
A differential pressure type emission flow rate measuring method and apparatus and an emission measuring system are capable of correcting measuring error occurring due to pulsation appropriately and enhancing the measuring precision of flow rate. In measuring the flow rate of an emission exhausted from an engine, an accurate flow rate in spite of pulsation is determined by using a differential pressure type flowmeter. The detected differential pressure signal is resolved by frequency, and is corrected by using a correction coefficient predetermined depending on each frequency obtained by frequency resolution.