Robert Boschgmbh

Holger Ziegler

Stefan Scherer

Tobias Pfister

Matthias Loehr

Herbert Schoemig

Rolf-Dieter Koch

Wolfram Faas

A method for monitoring a nitrogen oxide storage catalytic converter (NSC) in the exhaust gas duct of an internal combustion engine which is operated at least temporarily in a lean fashion, wherein during a lean mode of the internal combustion engine nitrogen oxides from the exhaust gas are stored by the nitrogen oxide storage catalytic converter, wherein during a regeneration phase of the nitrogen oxide storage catalytic converter the internal combustion engine is operated in a rich fashion, and as a result the nitrogen oxides stored in the nitrogen oxide storage catalytic converter are removed, and wherein an exhaust gas component or exhaust gas characteristic variable which is characteristic of the profile of the regeneration is detected during the regeneration phase by means of an exhaust gas probe.

Method and device for monitoring a nitrogen oxide storage catalytic converter

A method is presented for controlling an internal combustion engine (), which includes an exhaust gas system () having an exhaust gas aftertreatment component () that temporarily stores exhaust gas constituents and can be regenerated, wherein an expected value for a temperature of the exhaust gas aftertreatment component () is formed as a function of an increase in temperature, which arises as a result of exothermal reactions during the duration of an operating mode (BA) of the internal combustion engine () which is set for the regeneration of said exhaust gas aftertreatment component (), wherein the expected value is compared with an upper threshold value (T_max) and the control of said internal combustion engine () is changed when the threshold value (T_max) is exceeded, such that an expected value formed while taking the changed control into account does not exceed said threshold value (T_max). The method is thereby characterized in that a direction of change of a current temperature of said exhaust gas aftertreatment component () is taken into account when forming the expected value.

Method for controlling an internal combustion engine in connection with an exothermal regeneration of an exhaust gas aftertreatment component

Growing community of inventors

Niefern-Oeschelbronn, Germany

Holger Ziegler