Patent ID: 8707684

Claim:
An exhaust gas particulate filter system for an internal combustion engine, comprising: an internal combustion engine; an exhaust gas conduit in fluid communication with and configured to receive exhaust gas from the internal combustion engine; an oxidation catalyst in fluid communication with and configured to receive exhaust gas from the internal combustion engine to induce oxidation of the exhaust gas and heat the exhaust gas; a reductant injector downstream of the oxidation catalyst and connected to and in fluid communication with the exhaust gas conduit; a particulate filter assembly downstream of the reductant injector and in fluid communication with the exhaust gas conduit and configured to receive exhaust gas flowing therethrough, the particulate filter assembly comprising: a particulate filter to remove particulates from the exhaust gas; a heater device disposed near a front face of the particulate filter, to supply heat for regeneration of the particulate filter, after shut-off of the internal combustion engine, wherein the heater device comprises a plurality of zones to supply heat subsequently to each of the zones for regeneration of the particulate filter in a zoned manner; and an air pump to input air into the particulate filter to transfer the supplied heat from the heater device to the particulate filter; a temperature sensor downstream of the particulate filter and configured to generate a signal indicative of a temperature of the exhaust gas in the particulate filter; and a controller configured to: control the particulate filter assembly to activate the air pump, to regenerate the particulate filter and to deactivate the air pump after completion of regeneration of the particulate filter.