Method and device for exhaust gas aftertreatment in an internal combustion engine

Abstract

A device for exhaust gas aftertreatment in an internal combustion engine can be connected to an outlet of the internal combustion engine. The device comprises an exhaust gas system with an exhaust gas channel in which a three-way catalytic converter is arranged, and an exhaust gas burner with which hot burner exhaust gases can be fed into the exhaust gas channel at a feed point upstream from the three-way catalytic converter. The three-way catalytic converter is configured as a lambda probe catalytic converter and comprises a first catalyst volume and a second catalyst volume, whereby a lambda probe is arranged downstream from the first catalyst volume and upstream from the second catalyst volume, whereby the first catalyst volume has a lower oxygen storage capacity than the second catalyst volume. A method for exhaust gas aftertreatment in an internal combustion engine has such an exhaust gas aftertreatment device.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority from German Patent Application No. 10 2019 101576.6, filed Jan. 23, 2019, which is incorporated by reference in its entirety.FIELD OF THE INVENTION[0002]The invention relates to a device for exhaust gas aftertreatment in an internal combustion engine as well as to a method for exhaust gas aftertreatment in an internal combustion engine.BACKGROUND OF THE INVENTION[0003]Current legislation on exhaust-gas emissions, which will become increasingly stringent in the future, makes high requirements regarding raw engine emissions and the exhaust gas aftertreatment in internal combustion engines. Moreover, the period of time immediately after a cold start of the internal combustion engine has acquired special significance in terms of the emissions since, during this phase, the exhaust gas aftertreatment components are supposed to be heated up to their operating temperature as quickly as possible in order to permit ...

AI Technical Summary

Benefits of technology

The invention is about a device used in internal combustion engines to treat exhaust gas. The device includes a three-way catalytic converter and an exhaust gas burner. The burner is connected to the exhaust gas channel upstream from the converter, and its exhaust gas is fed to the converter through a burner exhaust gas feed point. The design helps minimize emissions during the heating phase of the catalytic converter. The device also includes a lambda probe catalytic converter, which helps regulate the mixed lambda value from the exhaust gas and the burner exhaust gas to achieve a stoichiometric exhaust gas. The burner is deactivated once the temperature of the catalytic converter reaches a certain level, which improves fuel efficiency of the engine and reduces emissions.

Problems solved by technology

This oxygen storage capacity causes any deviation of the lambda signal at the lambda probe of the lambda probe catalytic converter to be detected with a time delay.

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