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:
Mar. 25, 2014
Filed:
Apr. 20, 2011
Igor Zanetti, Verrayes, IT;
Marco Petronzi, Turin, IT;
Igor Zanetti, Verrayes, IT;
Marco Petronzi, Turin, IT;
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A method is provided to estimate NOconcentration in exhaust gas flowing through an exhaust pipe of an internal combustion engine. The exhaust pipe has a first section and a second section, and is equipped with an aftertreatment device located between the first section and the second section, and the method includes, but is not limited to determining a parameter related to a NOconcentration of exhaust gas flowing in the first section, determining an oxidization index expressive of a rate of NO contained in the exhaust gas which oxidizes into NOinside the aftertreatment device, and a reduction index expressive of a rate of NOcontained in the exhaust gas which is reduced into NO inside the aftertreatment device, and calculating a parameter related to a NOconcentration in the second section as a function of the parameter related to a NOconcentration in the first section and of the oxidization index and of the reduction index of the aftertreatment device.