Gaseous effluent processing unit's i.e. catalytic converter, functioning state diagnosing method for internal combustion engine of motor vehicle , involves comparing test criteria with threshold value defining performance fall of converter

摘要

#CMT# #/CMT# The method involves stimulating a gaseous effluent processing unit i.e. catalytic converter (25), by injecting a fuel using a fuel injector (29). Raising of an output temperature of the converter is monitored. An output temperature of an internal converter model that is not provided with catalytic activity, is calculated. The calculated temperature is compared with a value measured from the output temperature of the converter. Test criteria are developed based on the comparison. The criteria are compared with a threshold value defining a performance fall of the converter. #CMT# : #/CMT# An independent claim is also included for a gaseous effluent processing unit's functioning state diagnosing device comprising a fuel injecting unit. #CMT#USE : #/CMT# Method for diagnosing functioning state of a gaseous effluent processing unit i.e. catalytic converter, of an exhaust line of an internal combustion engine of a motor vehicle to detect ageing of the converter for reducing pollutant emission and oxidizing reducing molecules e.g. carbon monoxides and unburnt hydrocarbons, before evacuating the molecules towards the atmosphere. #CMT#ADVANTAGE : #/CMT# The method permits elimination of difference of thermal characteristics of the converter and different temperature sensors for measuring input and output temperatures of the converter and to consider derivation of thermal characteristics of the converter for influencing the converter on a thermal level in an output of an internal combustion engine of a motor vehicle. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a schematic view of an internal combustion engine with an exhaust line having a catalytic converter that is associated to a gaseous effluent processing unit's functioning state diagnosing device. 10 : Internal combustion engine 12 : Cylinders 25 : Catalytic converter 27 : Temperature sensor 29 : Fuel injector.