Patent ID: 6401454
Filing Date: 2002-06-11
Classification: F01N,F02D

Abstract:
An engine control device comprisingmeans for determining an amount of air taken into a cylinder of the engine; means for calculating an amount of fuel injected so as to achieve a target air-to-fuel ratio; an injector for supplying said fuel amount to said engine; an ignition plug for igniting a combustible fuel mixture at a designated ignition time; and a lean NOx catalyst for cleaning exhaust gas released from said engine, which further comprises means for determining or estimating a deteriorating condition of said lean NOx catalyst, and means for clean up rate reactivation for performing recovery and reactivation of the clean up rate of said NOx catalyst, wherein execution of clean up rate reactivation control is not allowed or is interrupted immediately when the temperature of said lean NOx catalyst exceeds a range of about 1000-1100Â° C.