Method for aftertreatment of exhaust gases and device for cleaning exhaust gases of internal combustion engines

Abstract

The present invention discloses a method and apparatus for post-treatment of an exhaust gas for an internal combustion engine (10), the internal combustion engine comprising an exhaust gas passage (12), a first three-way catalyst (14) arranged in the exhaust passage (12), particulate filter (18, 18 ') followed by the flow direction of the exhaust gas, and a device (20) which is used for the secondary air intake to the exhaust gas passage (12) and arranged disposed before the particulate filter (18, 18 ') along the flow direction of the exhaust gas, wherein a second three-way catalyst (16) is arranged in the exhaust passage (12) between the device (20) for secondary air intake and the particulate filter (18, 18 ') in the flow direction of the exhaust gas or the particulate filter (18 ') has a three-way catalytic coating. The method comprises the steps of: operating the internal combustion engine (10) in a stoichiometric combustion air ratio; detecting an exhaust gas passage arranged in the internal combustion engine (10) (18) in the exhaust gas passage (12); if necessary, by adjusting the flammable mixture for the internal combustion engine (10) to be concentrated and passing the secondary air into the exhaust gas passage (12), the temperature of the exhaust gas is raised to the regeneration temperature of the particulate filter (18) so that in the heating stage of the particulate filter (18, 18 ') in the second three-way catalyst (16) or in the catalytic coating of the particulate filter (18 '), and the internal combustion engine (10) is operated with a concentrated or stoichiometric mixture during the regeneration stage of the particulate filter (18, 18 ').

Description

technical field [0001] The invention relates to a device for exhaust gas aftertreatment of an internal combustion engine and a method for regeneration of an exhaust gas aftertreatment device. Background technique [0002] Continuously tightening exhaust gas regulations place higher demands on vehicle manufacturers, which are met by appropriate measures for reducing the original emissions of the engine and by appropriate exhaust gas aftertreatment. With the introduction of the EU6 standard in the next legislative phase, limit values ​​for particle counts are specified for gasoline engines. Compliance with this limit value can be ensured by using a gasoline engine particulate filter. During driving operation, such gasoline particulate filters are loaded with soot. In order not to significantly increase the pressure of the exhaust gas, the Otto particulate filter must be regenerated continuously or periodically. In order to thermodynamically oxidize the soot recovered by the...

AI Technical Summary

Problems solved by technology

[0005] The known devices and methods have the disadvantage that during regeneration at least in stages no complete exhaust gas cleaning is carried out, and thus the exhaust gas rises as it passes through the particle filter.

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