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:
Apr. 22, 2014
Filed:
Nov. 23, 2010
Christian Thomas Chimner, Royal Oaks, MI (US);
Hanlong Yang, Novi, MI (US);
Christian Thomas Chimner, Royal Oaks, MI (US);
Hanlong Yang, Novi, MI (US);
International Engine Intellectual Property Company, LLC, Lisle, IL (US);
Abstract
A vehicle has an exhaust aftertreatment system including an LNT. The vehicle operates through a series of ignition cycles, deNOcycles, and deSOcycles. DeNOoperations begin when the LNT reaches a loading threshold. The applicable threshold depends on operating conditions, such as mean LNT temperature and mean exhaust flow rate. The thresholds are adapted based on NOremoval efficiency data. The data is compared to target values. The target values depend on the operating condition range, but remain fixed while the thresholds are adapted. NOremoval efficiency is measured over intervals corresponding to entire deNOcycles. The data is sorted into bins according to operating conditions. The adaptations are only made if a bin has several data points accumulated over a minimum interval that is at least one ignition or deSOcycle, preferably several. The method provides stable adaptations that compensate for aging.