Diagnostic system for monitoring catalyst performance

   
   

A diagnostic system for monitoring catalyst performance in an exhaust system comprises a plurality of treatment devices catalytically treating an exhaust gas stream, and a plurality of gas sensors for monitoring the catalyst performance of the treatment devices to determine when sulfur poisoning occurs. An on-board diagnostic system receives signals from the gas sensors, and, based upon response time differentials between sensors, determines whether the treatment devices are experiencing sulfur poisoning.

Un sistema de diagnóstico para supervisar funcionamiento del catalizador en un dispositivo de escape abarca una pluralidad de los dispositivos del tratamiento catalítico que tratan una corriente del gas de escape, y una pluralidad de los sensores del gas para supervisar el funcionamiento del catalizador de los dispositivos del tratamiento para determinarse cuando ocurre el envenenamiento del sulfuro. Un sistema del diagnóstico a bordo recibe señales de los sensores del gas, y, basados sobre diferenciales del tiempo de reacción entre los sensores, se determina si los dispositivos del tratamiento están experimentando el envenenamiento del sulfuro.

 
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