| 摘要 |
A system for exhaust-gas aftertreatment in an internal combustion engine, having a feeding device (23) for feeding a freezable substance, in particular in the form of an aqueous urea solution, into an exhaust-gas flow of the internal combustion engine and at least one sensor arrangement with sensors (93, 94) which detect state variables which relate to the substance, such as pressure and temperature, wherein parts of the sensor arrangement interact with at least one fluid chamber (23) for at least partially receiving the freezable substance, is characterized in that, as a protective means against damage of the system by volumetric expansion in the case of freezing of the substance, a compensating device (100, 101) acts on the respective fluid chamber (27) in such a way that a volumetric expansion of the substance which accompanies an increase in the fluid pressure in the case of freezing is compensated for within the assignable fluid chamber. |
