CLOSED LOOP NOX REFERENCE MANAGEMENT FOR DPF REGENERATION BASED ON ENGINE OUT PARTICULATE MATTER VARIATION CONTROLLER

摘要

A method and related apparatuses and systems for operating an engine that provides a high level of NO_X to regenerate particulate matter deposited on a particulate filter. The method includes producing NO_X in response to a NO_X excess capacity value of a NO_X reduction device. The method optionally includes determining that particulate matter exceeds an enhanced passive regeneration threshold amount before providing a high level of NO_X. The method optionally includes producing a higher particulate emissions output value to warm the engine exhaust to bring an after treatment catalyst to an optimal operating temperature. The method can be implemented with a closed loop feedback controller, which may be configured to reduce particulate matter variation.