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

Abstract

The invention discloses a method and equipment for exhaust gas aftertreatment of an internal combustion engine (10). The internal combustion engine includes an exhaust gas channel (12) and a first three-way catalytic converter (14) arranged in the exhaust gas channel (12). , a particle filter (18, 18') connected downstream along the flow direction of the exhaust gas, and a secondary air inlet to the exhaust passage (12) arranged in front of the particle filter (18, 18') along the flow direction of the exhaust gas. device (20), wherein a second ternary element is arranged in the exhaust gas channel (12) between the device (20) for the secondary air intake and the particle filter (18, 18') in the flow direction of the exhaust gas. The catalytic converter (16) or the particle filter (18') has a three-way catalytic coating, and the method includes the following steps: the internal combustion engine (10) operates at a stoichiometric combustion air ratio; detecting the exhaust passage arranged in the internal combustion engine (10) The load state of the particulate filter (18) in (12); if necessary, the exhaust gas is purified by richening the combustible mixture for the internal combustion engine (10) and by introducing secondary air into the exhaust duct (12). The temperature is increased to the regeneration temperature of the particle filter (18), so that during the heating phase of the particle filter (18, 18') in the second three-way catalytic converter (16) or in the catalytically coated particle filter ( In 18'), rich combustion exhaust gases are oxidized exothermically by secondary air; and the internal combustion engine (10) is operated with a rich or stoichiometric mixture during the regeneration phase of the particle 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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