Method and device for converting a pollutant in an exhaust gas in a catalytic converter
AssigneeSeimens Aktiengesellschaft
InventorWinfried Dolling
Life of this patent
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Abstract
The invention relates to a method and to a device for using a reagent for converting a pollutant in an exhaust gas in a catalytic converter. The reagent is metered as a function of operational parameters of the exhaust gas and of a temperature of the catalytic converter. The reagent is added to the exhaust gas to form a mixture, and the mixture is fed through the catalytic converter. The temperature is determined recursively as a spatially and time-dependent function of the catalytic converter from the operational parameters of the exhaust gas and structural parameters of the catalytic converter. Catalytic activity in the catalytic converter is determined from the derived temperature and the reagent is metered as a function of the catalytic activity.
Claims11
A method for converting a pollutant in an exhaust gas in a catalytic converter using a reagent, which comprises:
- detecting a mass flow of an exhaust gas;
- detecting a temperature of the exhaust gas entering a catalytic converter;
- adding a reagent to the exhaust gas to form a mixture;
- feeding the mixture through the catalytic converter;
- determining the temperature of the catalytic converter recursively as a spatially and time-dependent function of the catalytic converter from only the mass flow of the exhaust gas, the temperature of the exhaust gas entering the catalytic converter, and structural parameters of the catalytic converter;
- determining catalytic activity in the catalytic converter as a spatially and time-dependent function from the determined temperature of the catalytic converter;
- and
- metering the addition of the reagent to the exhaust gas as a function of the catalytic activity.
A method for converting a pollutant in an exhaust gas in a catalytic converter using a reagent, which comprises:
- dividing a catalytic converter into subregions;
- adding a reagent to an exhaust gas to form a mixture;
- feeding the mixture sequentially through each subregion of the catalytic converter;
- determining the temperature of each subregion recursively as a spatially and time-dependent function of the catalytic converter from operational parameters of the exhaust gas and structural parameters of the catalytic converter;
- and
- determining catalytic activity in the catalytic converter from the temperature of each subregion;
- and metering the addition of the reagent to the exhaust gas as a function of the catalytic activity.
A device for converting a pollutant in an exhaust gas, comprising:
- a catalytic converter divided into sequentially disposed subregions for sequentially receiving an exhaust gas, said catalytic converter having structural parameters;
- a reagent addition device for metering and adding a reagent to the exhaust gas to form a mixture fed to said catalytic converter;
- sensor elements for measuring operational parameters of the exhaust gas;
- and
- a control unit for controlling the metering as a function of the operational parameters of the exhaust gas, said control unit having a memory for storing said structural parameters of said catalytic converter, said control unit configured for a recursive determination of a temperature of each of said subregions as a spatially and time-dependent function of the operational parameters and said structural parameters, said control unit configured for a determination of catalytic activity in said catalytic converter from the determination of the temperature of each of said subregions, said control unit causing said reagent addition device to meter the reagent as a function of said catalytic activity.
Dependencies are inferred from the claim text.