Apparatus, system, and method for controlling particulate accumulation on an engine filter during engine idling

A method for controlling the accumulation of particulate matter on a particulate matter filter of an engine system during idling engine operating conditions, the method comprising:

• operating the engine at an idling operating condition engine exhaust gas temperature and engine speed for a first time period;
• increasing a speed of the engine up to a desired engine speed at the beginning of a second time period following the first time period, the desired engine speed being higher than the idling operating condition engine speed;
• closing an air intake throttle near the beginning of the second time period to increase the temperature of engine exhaust gas by a first amount;
• closing a variable geometry turbine (VGT) device near the beginning of the second time period to increase the temperature of the engine exhaust gas by a second amount;
• and
• injecting fuel into the engine according to a post-injection fueling strategy near the beginning of the second time period to increase the temperature of the engine exhaust gas by a third amount;
• wherein exhaust entering the particulate matter filter at the idling operating condition engine exhaust gas temperature plus the first exhaust gas increase amount, second exhaust gas increase amount, and third exhaust gas increase amount facilitates a noxidation regeneration event on the particulate matter filter.

An internal combustion engine system, comprising:

• an internal combustion engine capable of producing an engine exhaust gas stream;
• a catalytic component in exhaust gas receiving communication with the internal combustion engine;
• a particulate matter filter in exhaust gas receiving communication with the catalytic component;
• an air intake throttle coupled to the internal combustion engine and regulating the flow rate of air into the engine;
• a variable geometry turbocharger (VGT) comprising actuatable vanes, the VGT being in exhaust gas receiving communication with the internal combustion engine;
• a fuel delivery system comprising a plurality of injectors communicable in fuel injecting communication with the engine;
• and
• a controller operable to alternate operation of the engine between an idling mode and a regeneration mode while the engine is continuously idling, wherein the transition from the idling mode to the regeneration mode comprises increasing the engine speed, closing the air intake throttle, closing the VGT vanes, and post-injecting fuel into the engine, and wherein the temperature of exhaust gas entering the particulate matter filter during the regeneration mode promotes a noxidation regeneration event on the particulate matter filter.