Exhaust gas aftertreatment system and method for exhaust gas aftertreatment of internal combustion engines

Abstract

The invention relates to an exhaust gas aftertreatment system for an internal combustion engine with external ignition according to the Otto engine principle. The internal combustion engine is connected to the exhaust gas equipment on the side of the exhaust port, wherein an electrically heatable three-way catalytic converter is arranged in the exhaust gas equipment along the flow direction of the exhaust gas through the exhaust gas equipment, and an electrically heatable three-way catalytic converter is arranged downstream of the electrically heatable three-way catalytic converter. A four-way catalytic converter, another three-way catalytic converter is arranged downstream of the four-way catalytic converter. Before starting the internal combustion engine, the electrically heatable three-way catalytic converter and preferably even the four-way catalytic converter is also heated in order to achieve effective exhaust gas aftertreatment of the untreated emissions of the internal combustion engine as soon as the internal combustion engine is started. The exhaust gas aftertreatment system is also designed to achieve an effective conversion of pollutants even during regeneration of the four-way catalytic converter and thereby ensure particularly low emissions in all operating situations of the motor vehicle.

Description

technical field [0001] The invention relates to an exhaust gas aftertreatment system for an internal combustion engine with external ignition, wherein in the exhaust system connected to the exhaust port of the internal combustion engine downstream of the exhaust port is arranged an electrically heatable A three-way catalytic converter, a four-way catalytic converter is arranged downstream of the electrically heatable three-way catalytic converter, and another three-way catalytic converter is arranged downstream of the four-way catalytic converter. The invention also relates to a method for the exhaust gas aftertreatment of an internal combustion engine with an exhaust gas aftertreatment system, wherein in an exhaust gas system connected to the exhaust gas outlet of the internal combustion engine, downstream of the exhaust gas outlet is arranged a An electrically heatable three-way catalytic converter, a four-way catalytic converter is arranged downstream of the electrically he...

AI Technical Summary

Problems solved by technology

Although such exhaust gas aftertreatment systems are used in normal operation to convert harmful exhaust gas components very effectively and to minimize emissions, in the specific operating conditions of the internal combustion engine, especially during the cold start phase of the internal combustion engine or in the four-way catalytic converter During regeneration, not all harmful exhaust gas components are converted and an increase in tailpipe emissions occurs

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