Patent ID: 8783012
Filing Date: 2014-07-22
Classification: F01N,Y02T

Abstract:
1. A method for estimating an efficiency of a catalyst in an exhaust of an engine, comprising: ageing the catalyst consecutively at different temperatures for definite time periods; measuring the catalyst conversion efficiency after each ageing step; calculating an ageing factor for each step of an ageing procedure and an accumulative value of the ageing factors for all steps of the ageing procedure based on a formulation AF=Σ estimating an activation energy of an ageing process (E estimating catalyst efficiency correlation factors related to the measured catalyst conversion efficiency for each temperature point and for all ageing conditions; determining a correlation between the catalyst efficiency correlation factors and the accumulative value of the ageing factors; calculating the conversion efficiency of the aged catalyst based on a predetermined correlation between the accumulative ageing factor and the catalyst efficiency correlation factor, obtaining the catalyst efficiency correlation factors for the catalyst aged at a lowest temperature; and estimating the activation energy of the ageing process (E calculating the conversion efficiency of the aged catalyst based on the activation energy of the ageing process (E