Method for detecting abnormally frequent diesel particulate filter regeneration, engine and exhaust aftertreatment system, and warning system and method

摘要

A method is provided for detecting abnormally frequent diesel particulate filter (DPF) regeneration. The method includes measuring a pressure drop across the DPF and using the measured pressure drop to calculate a pressure drop based soot load estimate, calculating soot output from an engine model and using the calculated soot output to calculate an emissions based soot load estimate, comparing the pressure drop based soot load estimate with the emissions based soot load estimate, and providing a warning if a difference between the pressure drop based soot load estimate and the emissions based soot load estimate exceeds a predetermined.

主权项

1. A method for diagnosing engine and exhaust aftertreatment system health by detecting abnormally frequent diesel particulate filter (DPF) regeneration, comprising:
operating an engine and an exhaust aftertreatment system downstream of the engine, the exhaust aftertreatment system comprising a DPF; measuring a pressure drop across the DPF and using the measured pressure drop to calculate a pressure drop based soot load estimate; calculating soot output from an engine model and using the calculated soot output calculate an emissions based soot load estimate; comparing the pressure drop based soot load estimate with the emissions based soot load estimate when one of the pressure drop based soot load estimate and the emissions based soot load estimate reaches a predetermined soot load limit; triggering active DPF regeneration when one of the pressure drop based soot load estimate and the emissions based soot load estimate reaches the predetermined soot load limit; and identifying abnormally frequent active regeneration of the DPF if a difference between the pressure drop based soot load estimate and the emissions based soot load estimate exceeds a predetermined value, wherein the predetermined value is a predetermined time period, the abnormally frequent regeneration being identified if a difference in time between a time at which one of the pressure drop based soot load estimate and the emissions based soot load estimate reaches the predetermined soot load limit and a time at which the other one of the pressure drop based soot load estimate and the emissions based soot load estimate is expected to reach the predetermined soot load limit exceeds the predetermined time period.