| 摘要 |
A system for injecting a nitrogen oxide reducer into an exhaust gas flow, in particular for a combustion engine, has a injection element for controlled injection of the reducer into the exhaust gas flow. The injection element contains a micromechanical nozzle element 1a, 1b which injects the reducer controllably into the exhaust gas flow through a multiplicity of fine nozzle openings 10 in the form of fine jets by means of local, measured generation of overpressure. This pressure is obtained by energising heating elements in the nozzle so that the liquid instantly vaporises, or by use of piezo-electrically driven diaphragms.
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