Method and internal combustion engine for determining the load state of a particulate filter

Abstract

The invention relates to a method for determining the load state of a particle filter arranged in the exhaust system of an internal combustion engine supercharged with an exhaust gas turbocharger. To determine the load state, the position of the control unit of the turbine of the exhaust gas turbocharger is detected and compared with the same operating parameters in the case of an unloaded particle filter with the position during operation of the internal combustion engine. In addition, an air mass meter is provided on the fresh air side of the internal combustion engine in order to be able to differentiate the pressure situation at the turbine of the exhaust gas turbocharger from an increasing change in the exhaust gas backpressure due to the increased load on the particle filter. Changes in pressure conditions due to leaks in the gas supply system. Furthermore, the invention relates to an internal combustion engine with a controller designed to carry out such a method.

Description

technical field [0001] The invention relates to a method for determining the loading state of a particle filter in an exhaust system of an internal combustion engine and to an internal combustion engine with an exhaust gas turbocharger and a particle filter arranged in the exhaust system. Background technique [0002] Current and future exhaust gas regulations (Abgasgesetzgebung), which will become more stringent, place high demands on raw engine emissions (Rohemission, sometimes also called untreated emissions) and exhaust gas aftertreatment of internal combustion engines. In the case of diesel engines, particulate filters for suppressing the formation of carbon particles (Russpartikel) in the case of engine combustion have been standard for many years and are currently used in almost all diesel engines for exhaust gas aftertreatment . With the introduction of the exhaust gas standard EU6 for gasoline engines (Ottomotor, sometimes also called Otto engines), limit values ​​...

AI Technical Summary

Problems solved by technology

In the case of an internal combustion engine with an exhaust gas turbocharger, the increase in the exhaust backpressure due to the carbon particles trapped in the particulate filter results in the following, namely, the pressure drop across the turbine of the exhaust gas turbocharger (Druckgefälle ) and thus possible turbine power drop

Since the turbine and compressor of the exhaust gas turbocharger are mechanically coupled, the possible compressor pressure ratio is also reduced

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