| abstract |
tonReduction of pollutants in automotive exhaust gases, in particularnFor the reduction of nitrogen oxides, there are various methodsnwhere pollutant-reducing fluids (gases or liquids) arenbe introduced into the exhaust system of the motor vehicle. EspeciallynUrea mixtures or ammonia are used, which thenReduce nitrogen oxides in the exhaust gases and u. a. in differentnConvert nitrogen. A suitable dosage of the pollutant-reducingnHowever, media still poses a technical challengenIt is therefore proposed a metering system, which u. a.na metering pump (216) and at least one self-openingnNozzle (218) for injectionnfluid media in an exhaust system. In particular, a self-openingnNozzle (218)nwhich has a needle chamber (318) with a nozzle needle (322).nand a spring chamber (320) having a spring element (332).nNeedle chamber (318) and spring chamber (320) are connected by a flexible membranen(336) separated, which prevents fluidic medianfrom the needle chamber (318) in the spring chamber (320) can penetrate, andnwhich still allows itnthat in the needle chamber (318) relative to the spring chamber (320) an overpressurencan build, causing the nozzle needle (322) against anSpring force moves and a nozzle opening (314)nreleases. The described dosing system, which in contrast tonusualnSystems on diaphragm pumps and dosing valves do without ... |