Patent ID: 6581374
Filing Date: 2003-06-24
Classification: B01D,F01N,Y02A,Y02T

Abstract:
A method for determining the functional temperature of a catalyst in an exhaust system of a vehicle comprising the steps of:i) determining, by sensing or calculating, the temperature of the exhaust gases and the space velocity of the exhaust gases through the catalyst; and, ii) filtering the exhaust gas temperature by a catalyst filter to generate the functional temperature of the catalyst, said filtering step represented in the continuous time domain by the transfer function H&it;(s)=1Ï„1&CenterDot;s+1&CenterDot;1Ï„2&CenterDot;s+1where &tgr;1 equals &tgr;2 and is a function of the space velocity of the exhaust gases.