| 摘要 |
The invention relates to a method and arrangement for purifying an exhaust gas stream of a spark ignition engine (1) flowing in an exhaust gas line (2). An air/fuel mixture is preferably supplied to said spark ignition engine by means of direct injection. For an improved purification, the exhaust gas flows, in succession, through the exhaust gas line (2), through at least one honeycomb body (3) with a catalytically active coating, preferably with a three-way coating, and through a particle filter (4) with a coating which accumulates at least one pollutant component, in particular, hydrocarbon (HC), carbon monoxide (CO) and/or nitrogen oxide (NOx) in an at least temporary manner. The invention is particularly suited for exhaust gas systems of spark ignition engines (1). In addition to its existing task of collecting soot particles, the particle filter (4) advantageously assumes the function of carrying out, in particular, the supplementary oxidation of residual hydrocarbons (HC) as well as carbon monoxide (CO) during the cold start phase, and carries out, in particular, the supplementary reduction of residual nitrogen oxides (NOx) when the spark ignition engine (1) is operated under load.
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