Systems and methods for compensating NOx sensor measurements to meet sufficiency requirements

A method for diagnosing an exhaust aftertreatment system and mitigating the effects of a potential fault in the exhaust aftertreatment system, the method comprising:

• receiving, by a controller, data indicative of an amount of at least one of a gain or an offset affecting a sensor associated with the exhaust aftertreatment system;
• determining, by the controller, a compensation gain value and a compensation offset value based on the amount of the at least one of the gain or the offset;
• receiving, by the controller, data indicative of an amount of an exhaust gas constituent in the aftertreatment system;
• applying, by the controller, the compensation gain value to the data indicative of the amount of the exhaust gas constituent in the aftertreatment system to create compensated data when the compensation gain value is less than a first threshold, the compensation offset value is less than a second threshold, and the compensation gain value is less than the compensation offset value;
• and
• initiating, by the controller, an action based on the compensated data.

A system for diagnosing an exhaust aftertreatment system and mitigating the effects of a potential fault in the exhaust aftertreatment system, the system comprising:

• a selective catalytic reduction (SCR) system;
• a sensor structured to provide exhaust gas constituent information regarding exhaust gas;
• and
• a controller configured to:
• receive the exhaust gas constituent information from the sensor;
• determine a compensation gain value and a compensation offset value;
• apply the compensation offset value to the exhaust gas constituent information to create compensated information when the compensation gain value is less than a first threshold, the compensation offset value is less than a second threshold, and the compensation gain value is less than the compensation offset value;
• and
• initiate an action based on the compensated information.