A method for regeneration of NOx storage catalytic converter of exhaust aftertreatment device

Abstract

A method for regeneration of a NOx storage catalytic converter of an exhaust aftertreatment device of an internal combustion engine arrangement, the method comprising the steps of: detecting a shutdown of an internal combustion engine; determining a load of the NOx storage catalytic converter; determining a current operating temperature of the exhaust aftertreatment device; if the determined loadexceeds a fixed threshold and the determined current operating temperature exceeds a fixed threshold, regenerating the NOx storage catalytic converter after closure of the internal combustion engine,the exhaust valve is closed and the exhaust gas is directed through the low pressure exhaust gas recirculation flow passage, fresh air and exhaust gas recirculated via the low-pressure exhaust gas recirculation flow channel are conducted to the NOx storage catalytic converter via the high-pressure exhaust gas recirculation flow channel by means of an electrically driven supercharger and are simultaneously heated, and mixing a mixture of fresh air and recirculated exhaust gas with the vaporized fuel upstream of the NOx storage catalytic converter to form a rich air-fuel mixture.

Description

technical field [0001] The invention relates to a method for regeneration of a NOx storage catalytic converter of an exhaust gas aftertreatment device. The invention further relates to a control device for regeneration of a NOx storage catalytic converter, an exhaust aftertreatment device, an engine arrangement, a motor vehicle and a computer program product. Background technique [0002] After the combustion gases have left the burners or combustion chambers of the internal combustion engine driving the motor vehicle, they are cleaned by mechanical, catalytic or chemical means using exhaust aftertreatment devices, enabling compliance with the statutory pollutant limits. [0003] Against the background of increasingly stricter legal requirements for motor vehicle emissions, a widespread demand for exhaust gas aftertreatment has thus arisen. In particular, emissions from cold starts of diesel engines pose challenges in complying with future exhaust emission standards. A NOx...

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However, this is negative with regard to CO2 emissions and risks of oil dilution

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