Systems and methods for diagnosis of NOx storage catalyst

A method comprising:

• performing, by a controller, an enable operation responsive to receiving information indicative of an enable parameter, the enable operation comprising:
• determining a predicted downstream NOx value of an exhaust gas stream exiting a NOx storage catalyst;
• determining a downstream NOx value of the exhaust gas stream exiting the NOx storage catalyst;
• determining an error between the predicted downstream NOx value and the determined downstream NOx value;
• comparing the error to an error threshold;
• and
• determining that the NOx storage catalyst is in good health responsive to determining that the error does not exceed the error threshold;
• and
• performing, by the controller, a disable operation responsive to receiving information indicative of a disable parameter comprising a temperature of the exhaust gas stream indicating a warm engine operating condition, the disable operation causing a deactivation of at least a portion of the controller.

An apparatus comprising:

• at least one processor;
• and
• at least one memory device storing instructions that, when executed by the at least one processor, cause the at least one processor to:
• perform an enable operation responsive to receiving information indicative of an enable parameter, the enable operation comprising:
• determining a predicted downstream NOx value of an exhaust gas stream exiting a NOx storage catalyst;
• determining a downstream NOx value of the exhaust gas stream exiting the NOx storage catalyst;
• determining an error between the predicted downstream NOx value and the determined downstream NOx value;
• comparing the error to an error threshold;
• and
• determining that the NOx storage catalyst is in good health responsive to determining that the error does not exceed the error threshold;
• and
• perform a disable operation responsive to receiving information indicative of a disable parameter comprising a temperature of the exhaust gas stream indicating a warm engine operating condition, the disable operation causing a deactivation of at least a portion of the apparatus.