Abstract: The invention relates to an injection nozzle (1) for injection of a reducing agent into an exhaust gas system (2) of an internal combustion engine for selective catalytic reduction, especially for atomization by means of compressed air or propellant gas, the nozzle (1) having at least one outlet opening, the nozzle (1) upstream of the outlet opening having a variable volume (8) which after completion of injection of the liquid is increased in order to draw gas from the vicinity (2) through the outlet opening into the nozzle (1).

Abstract: The invention relates to a reducing agent metering system for injection of a reducing agent into the exhaust gas flow of an internal combustion engine for selective catalytic reduction, with a delivery pump (2) by means of which the reducing agent is delivered from a reducing agent tank (1) via a delivery line (3) and is introduced into the exhaust gas flow of the internal combustion engine via at least one nozzle (7), a metering chamber (4) being integrated into the delivery line (3) and being divided into two separate volumes (10, 20) by means of a position-variable element (5), each of the two volumes (10, 20) having at least one input (11, 21) and at least one output (12, 22). Furthermore the invention relates to a method for operating such a reducing agent metering system for injection of a reducing agent into the exhaust gas flow of an internal combustion engine for selective catalytic reduction.

Abstract: The invention relates to a reducing agent metering system for injection of a reducing agent into the exhaust gas flow of an internal combustion engine for selective catalytic reduction, with a delivery pump (2) by means of which the reducing agent is delivered from a reducing agent tank (1) via a delivery line (3) and is introduced into the exhaust gas flow of the internal combustion engine via at least one nozzle (7), a metering chamber (4) being integrated into the delivery line (3) and being divided into two separate volumes (10, 20) by means of a position-variable element (5), each of the two volumes (10, 20) having at least one input (11, 21) and at least one output (12, 22). Furthermore the invention relates to a method for operating such a reducing agent metering system for injection of a reducing agent into the exhaust gas flow of an internal combustion engine for selective catalytic reduction.

Abstract: The invention relates to an injection nozzle (1) for injection of a reducing agent into an exhaust gas system (2) of an internal combustion engine for selective catalytic reduction, especially for atomization by means of compressed air or propellant gas, the nozzle (1) having at least one outlet opening, the nozzle (1) upstream of the outlet opening having a variable volume (8) which after completion of injection of the liquid is increased in order to draw gas from the vicinity (2) through the outlet opening into the nozzle (1).