Patent ID: 7950223

Claim:
A method for temperature management in an exhaust gas posttreatment system of an internal combustion engine, having an exhaust gas duct in which an SCR catalytic converter is provided in a flow direction of the exhaust gas, and a reductant generating system has both an NO x and CO/H 2 generating unit and a combined NO x reservoir/ammonia generating unit in a standard gas course of the reductant generating system, and for reducing nitrogen oxides, ammonia is supplied as reductant by the reductant generating system upstream of the SCR catalytic converter, and the NO x and CO/H 2 generating unit is at least intermittently supplied via a fuel supply and an air supply with starting materials for generating the ammonia, the method comprising at least intermittently cooling an AGC matrix of the combined NO x reservoir/ammonia generating unit by means of an internal and/or external cooling device, and passing cool ambient air as a cooling medium through the cooling device and supplying the cool ambient air as an educt to the NO x and CO/H 2 generating unit inside the reductant generating system, and by means of a valve assembly inside the air supply, a stream of cool ambient air is reversed between a starting heating/intermediate heating air path and an operating air path, the valve assembly being triggered by a control unit.