| 摘要 |
The invention relates to a device for ventilating an exhaust gas after-treatment system (10), with which a freezable operating/auxiliary agent, in particular a reduction agent, is metered into an exhaust tract (12) of an internal combustion engine. A hydraulic spring accumulator (60, 66, 68) stores energy during operation with system pressure. Upon shut-down of the internal combustion engine, said accumulator releases the energy without current such that a vacuum for suctioning the operating/auxiliary agent out of components of the exhaust gas after-treatment system is generated. |
