System for monitoring exhaust gas concentrations

A method for monitoring exhaust gas concentrations in an exhaust stream of an engine comprising:

• producing a rich condition in the exhaust stream;
• monitoring an output of a sensor in fluid communication with the exhaust stream;
• determining, during the rich condition, a concentration of at least one sulfur-containing compound of the exhaust stream based on the output of the sensor during the rich condition;
• producing a lean condition in the exhaust stream;
• and
• determining, during the lean condition, a concentration of NOx in the exhaust stream based on the output of the sensor during the lean condition.

A work machine comprising:

• an engine;
• an exhaust system configured to carry an exhaust stream generated by the engine;
• and
• a system for monitoring exhaust gas concentrations in the exhaust stream, including:
• at least one sensor in communication with the exhaust stream and being configured to generate an output indicative of a concentration of NOx and a concentration of at least one sulfur-containing compound in the exhaust stream;
• and
• a controller configured to:
• selectively produce one of a rich condition and a lean condition in the exhaust stream;
• determine, during the rich condition, the concentration of the at least one sulfur-containing compound in the exhaust stream based on the output from the at least one sensor;
• and
• determine, during the lean condition, the concentration of NOx in the exhaust stream based on the output from the at least one sensor.