METHOD AND DEVICE FOR DETECTING THE PRESENCE OF AN EXHAUST GAS TREATMENT SYSTEM IN AN EXHAUST LINE OF AN INTERNAL COMBUSTION ENGINE

摘要

The process comprises determining the temperature coefficient before and after a treatment unit (28) in a motor vehicle IC engine exhaust system (22) and comparing the temperature coefficient after the unit with a threshold value to detect the absence of a treatment unit from the temperature coefficient measured before the unit. Each time the threshold value is exceeded the data is fed to a computer which determines from a second threshold value when the treatment unit is absent or not functioning.