Method for regenerating soot filters in the exhaust gas system of a lean mix engine, and exhaust gas system therefor
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United States of America Patent
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Dec 11, 2012
Grant Date -
Apr 29, 2010
app pub date -
Jan 31, 2008
filing date -
Jan 31, 2007
priority date (Note) -
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Abstract
To adhere to legal exhaust-gas regulations, the exhaust gases of a lean-burn engine must be freed from soot particles and nitrogen oxides. It is proposed that the cylinders of the lean-burn engine be divided into two groups which discharge their exhaust gases into two associated exhaust lines which each comprise a soot filter and which are merged at an opening-in point into a common exhaust line. The common exhaust line comprises the catalytic converter for the removal of the nitrogen oxides. By regenerating the two soot filters at different times, the exhaust-gas temperature in the common exhaust line is limited to a mean temperature between the exhaust-gas temperature of normal operation and that of regeneration operation, and the catalytic converter for the removal of the nitrogen oxides is preserved.
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