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. 21, 2002
Filed:
Oct. 26, 2000
Luca Poggio, Spinetta Marengo, IT;
Ciro Barberio, Zola Predosa, IT;
Matteo De Cesare, Torremaggiore, IT;
Daniele Ceccarini, Rimini, IT;
Magneti Marelli S.p.A., Milan, IT;
Abstract
A method for the diagnosis of an exhaust gas purification system for an internal combustion engine, provided with a pre-catalyst and a main catalyst disposed along an exhaust duct of an internal combustion engine; the method including the stages of determining a real heat supplied to the exhaust gases in the pre-catalyst as a function of a input temperature and an output temperature of the exhaust gases at the input and output respectively of the pre-catalyst; determining a nominal heat supplied during nominal operating conditions of the pre-catalyst; calculating an index representative of the state of wear of the pre-catalyst, as a function of the real heat and the nominal heat; comparing the index with a threshold value.