| 摘要 |
A method is described for operating an engine and an emission control system downstream of the engine, the emission control system including a catalyst, an exhaust gas path coupling the engine to the catalyst, a first air-fuel ratio sensor positioned upstream of the catalyst and a second air-fuel ratio sensor positioned adjacent to or downstream of the catalyst. The method includes correlating variation in the catalyst performance across air-fuel ratios, as identified via the first and second sensors, to fuel composition of fuel combusted in the engine.
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