METHOD FOR FLUSHING AN EXHAUST-GAS CLEANING SYSTEM
A method for flushing an exhaust-gas cleaning system of an internal combustion engine having a catalytic converter with at least one catalyst bed, whereby an exhaust gas from the internal combustion engine is supplied to the exhaust-gas cleaning system in an active operating phase of the exhaust-gas cleaning system, and no exhaust gas is supplied to the exhaust-gas cleaning system in a passive operating phase of the exhaust-gas cleaning system, whereby a temperature of the at least one catalyst bed is determined and the flushing is performed depending on the determined temperature, whereby the exhaust-gas cleaning system is flushed in the passive operating phase of the exhaust-gas cleaning system by a flushing device, which is connected directly to an exhaust-gas line.
1 . A method for flushing an exhaust-gas cleaning system of an internal combustion engine comprising a catalytic converter with at least one catalyst bed, wherein an exhaust gas from the internal combustion engine is supplied to the exhaust-gas cleaning system in an active operating phase of the exhaust-gas cleaning system, and no exhaust gas is supplied to the exhaust-gas cleaning system in a passive operating phase of the exhaust-gas cleaning system, wherein a temperature of the at least one catalyst bed is determined and the flushing is performed depending on the determined temperature, wherein the exhaust-gas cleaning system is flushed in the passive operating phase of the exhaust-gas cleaning system by a flushing device, which is connected directly to an exhaust-gas line.
2 . The method according to claim 1 , wherein the exhaust-gas cleaning system is flushed only in the passive operating phase of the exhaust-gas cleaning system.
3 . The method according to claim 1 , wherein the temperature of the at least one catalyst bed is determined in the passive operating phase of the exhaust-gas cleaning system.
4 . The method according to claim 1 , wherein the exhaust-gas cleaning system is flushed after a shutdown of the internal combustion engine.
5 . The method according to claim 1 , wherein a period of time during which the exhaust-gas cleaning system is flushed is determined depending on the determined temperature.
6 . The method according to claim 1 , wherein the exhaust-gas cleaning system is flushed before a start-up of the internal combustion engine.
7 . The method according to claim 1 , wherein the exhaust-gas cleaning system is flushed until the temperature of the at least one catalyst bed is lower than or equal to a predetermined setpoint temperature.
8 . The method according to claim 7 , wherein the exhaust-gas cleaning system is flushed if the temperature of the at least one catalyst bed before flushing is higher than or equal to a predetermined threshold value E.
9 . The method according to claim 1 , wherein a first exhaust-gas temperature value is determined upstream of the catalytic converter and a second exhaust-gas temperature value is determined downstream of the catalytic converter, wherein the temperature of the at least one catalyst bed is determined by taking account of the first exhaust-gas temperature value and the second exhaust-gas temperature value.