METHOD FOR OPERATING A SYSTEM TO REDUCE THE TOXICITY OF EXHAUST GASES WITH A CATALYTIC CATALYTIC REDUCTION CATALYST AND LOCATED BEFORE IT A CATALYSIS DEVICE FOR REDUCING THE TOXICITY REDUCTION

摘要

1. The method of operation of the exhaust gas aftertreatment system of an automobile internal combustion engine (1), in which a catalytic oxidation device (3) for neutralizing exhaust gases is located in front of the exhaust catalyst (5) for exhaust gas for the exhaust gas recovery catalyst, wherein the catalytic oxidation of the exhaust gas aftertreatment device (3) is determined by the ratio of the hydrocarbon content in the exhaust gas before catalytic cal oxidation device (3) and exhaust gas occurring simultaneously converting the nitrogen oxide catalyst (5) selective reduction. ! 2. The method according to claim 1, characterized in that before the catalytic oxidation device (3) for neutralizing exhaust gases in the exhaust gases, various hydrocarbon contents are established and a reduction in the predetermined conversion of nitric oxide associated with the hydrocarbon content is used as a basis for determining the degree of aging . ! 3. The method according to claim 2, characterized in that the installation of various hydrocarbon contents in the exhaust gas is performed at the operating point at the temperature of the catalytic oxidation device (3) for neutralizing the exhaust gas, in which the catalytic oxidation of nitric oxide to nitrogen dioxide in the catalytic oxidation device (3) neutralizing exhaust gas in a fresh state is at least approximately maximum. ! 4. The method according to claim 2 or 3, characterized in that the installation of hydrocarbon contents in the outlet