METHOD AND DEVICE FOR MONITORING A PARTICLE FILTER

摘要

The invention relates to a method for monitoring a particle filter in the exhaust gas duct of an internal combustion engine powered by gasoline. The invention further relates to a device for carrying out the method. According to the invention,a first exhaust gas temperature upstream of the particle filter and a second exhaust gas temperature downstream of the particle filter are determined and that a presence and/or a correct functioning of the particle filter is deduced from a difference between the first and the second exhaust gas temperature or from a different temporal progression of the first and the second exhaust gas temperature. The method is based on a detection of the effect of the thermal mass of the particle filter or the influence thereof on the temperature of the exhaust gas during combustion of soot particles accumulated in the particle filter. By this means, the temperature progressions show characteristic differences upstream and downstream of the particle filter. If these do not occur, the particle filter is removed and replaced, for example, by a pipe section whose thermal mass is substantially lower than that of the particle filter.