Patent ID: 7866143

Claim:
An exhaust gas treatment system for an exhaust system of an internal combustion engine, comprising: a basic housing and an add-on housing adapted to be mounted on the former so that the add-on housing is at least partially detachable from the basic housing; the basic housing containing at least one inlet pipe adapted to be connected to the exhaust system and inserted into the basic housing, at least one outlet pipe adapted to be connected to the exhaust system and leading out of the basic housing, at least one SCR catalyst and at least one oxidizing catalytic converter; wherein the add-on housing contains at least one particle separation device and at least one reducing agent feed mechanism, wherein the add-on housing has a first housing part accommodating essentially the second chamber and the particle separation device and a second part that is detachably mounted on the first housing part and accommodates the third chamber and the reducing agent feed mechanism, and wherein: the first housing part is adapted to be removed from the basic housing independently of the second housing part and; the second housing part is adapted to be removed from the basic housing independently of the first housing part.