| 摘要 |
<p>The invention relates to a method and an arrangement for monitoring the functioning of an exhaust gas aftertreatment system (2) of a motor vehicle based on a measuring signal from a sensor (11) as to the magnitude of a parameter related to exhaust gases flowing out of an exhaust gas aftertreatment appliance (5), for instance in the form of a catalyst or a filter, included in the exhaust gas aftertreatment system (2). A frequency analysis of the measuring signal supplied by the sensor (11) during a certain period of time is performed so as to establish an evaluation value that reflects the character of a frequency part of the measuring signal supplied by the sensor during this period of time. Information regarding the functioning of the exhaust gas aftertreatment system (2) is generated based on this evaluation value.</p> |
