DEVICE AND METHOD FOR DETERMINING A MALFUNCTION IN A FILTER

摘要

The invention relates to a device for determining a malfunction in a filter that purifies a gas stream, in particular that eliminates soot particles from an exhaust gas stream. Said device comprises a chamber (1), which can be introduced into the gas stream to be purified in addition to the filter, is partially sealed by a filter body (2) and has at least one opening (3), out of which gas that enters the chamber (1) through the filter body (2) can re-emerge from said chamber. According to the invention, at least one gas sensor (4) for determining the concentration of at least one component of the gas to be purified is located in the chamber (1) and at least one second gas sensor (12) for determining the concentration of said component of the gas to be purified is located outside the chamber.