Regeneration diagnostic methods and systems

A method of monitoring an exhaust treatment system of a vehicle, comprising:

• monitoring regeneration of a particulate filter of the exhaust treatment system;
• determining, by a module comprising a processor, a modeled resistance of exhaust flow in the exhaust treatment system;
• determining a measured resistance of exhaust flow in the exhaust treatment system based on a regression algorithm that uses a plurality of values of a particulate filter temperature, an exhaust flow temperature and a delta pressure that are measured over a period of time;
• determining that the regeneration of the particulate filter does not occur more frequently than necessary in response to determining that a ratio of the modeled resistance to the measured resistance is not greater than a threshold ratio;
• evaluating a plurality of triggering conditions that trigger the regeneration of the particulate filter in response to determining that the ratio is greater than the threshold ratio;
• determining that the regeneration of the particulate filter occurs more frequently than necessary in response to determining that the plurality of triggering conditions indicate that a regeneration is not needed;
• determining that the regeneration of the particulate filter does not occur more frequently than necessary in response to determining that the plurality of triggering conditions indicate that a regeneration is needed;
• and
• generating at least one of a warning signal and a message based on whether the regeneration of the particulate filter occurs more frequently than necessary,
• wherein each of the modeled resistance and the measured resistance dynamically change such that the ratio is based on a dynamically changing measured resistance with respect to a dynamically changing modeled resistance.