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:
May. 03, 2005
Filed:
Nov. 07, 2002
Tokihiro Tsukamoto, Miyanohigashi-machi, JP;
Koichi Matsumoto, Miyanohigashi-machi, JP;
Nobutaka Kihara, Miyanohigashi-machi, JP;
Tokihiro Tsukamoto, Miyanohigashi-machi, JP;
Koichi Matsumoto, Miyanohigashi-machi, JP;
Nobutaka Kihara, Miyanohigashi-machi, JP;
Horiba, Ltd., Osaka, JP;
Abstract
The present invention provides a method for easily measuring nitrogen oxide concentration of an engine vehicle emission. The method can measure vehicle emission from an engine of a vehicle in travel with high precision even in regions other than the lean region, that is, regions from the stoichiometrical region to the rich region by using a NOsensor exclusively used for the lean region. The present invention has an arrangement in which a NOsensor that is exclusively used for the lean region is installed in an exhaust pipeconnected to the engine. Air (secondary air) A is introduced into the exhaust pipeon the upstream side of the NOsensorso that the NOsensoris allowed to measure the concentration of NOin the engine vehicle emission diluted by air A. Thus, the NOconcentration in the engine vehicle emission before dilution G is obtained by using the measured value of the NOconcentration after dilution and by using a dilution ratio.