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:
Jan. 24, 2012
Filed:
Dec. 14, 2004
Andreas Hinz, Onsala, SE;
Lennart Andersson, Varberg, SE;
Andreas Hinz, Onsala, SE;
Lennart Andersson, Varberg, SE;
Volvo Lastvagnar AB, Göteborg, SE;
Abstract
A method, a device and a computer program product for the diagnosis of an oxidation catalyst for the oxidation of NO into NOin a motor vehicle is provided. An exhaust gas aftertreatment system includes at least the aforementioned oxidation catalyst and a particulate filter and/or an NO-reducing catalyst arranged downstream of the oxidation catalyst, and a predetermined quantity of a reducing agent is supplied to the exhaust system upstream of the oxidation catalyst, and the NOcontent or NOcontent is measured downstream of the oxidation catalyst. The method includes measuring a first value for the NO/NOcontent at a point in time before the reduction agent is supplied to the exhaust gas system, measuring a second value for the NO/NOcontent at a point in time during the period when the reduction agent is supplied to the exhaust gas system, and comparing the aforementioned values, in conjunction with which an indication of the impaired function of the oxidation catalyst is obtained when the difference between the aforementioned measured values is less than a predetermined first value.