Method for estimation of the catalyst efficiency loss

摘要

The present invention relates to a Method of estimating the efficiency of a catalyst located in the exhaust path and/or downstream of an internal combustion engine comprising the steps of: monitoring a temperature of the catalyst with at least one temperature sensor; calculating an accumulative exposition of the catalyst to thermal ageing conditions with the measured catalyst temperature; applying a predetermined correlation between the accumulative exposition of the catalyst to the thermal ageing conditions and characteristic of the catalyst performance to estimate the catalyst properties; comparing the accumulative exposition of the catalyst to thermal ageing conditions to a predetermined threshold limit of the thermal ageing conditions. performing indicative measures in case if the actual value of the thermal ageing conditions reached and/or exceeded the pre-determined fraction of the predetermined threshold value. <IMAGE>