Regeneration of a particulate filter ('PF') with the engine off using a single secondary energy storage device

摘要

An exhaust treatment system (10) for an internal combustion engine (12), the internal combustion engine (12) having an engine off condition, comprising: an exhaust conduit (14) in fluid communication with the internal combustion engine (12) configured to exhaust an exhaust gas from the engine Internal combustion engine (12); a particulate filter ("PF") device (24) in fluid communication with the exhaust conduit (14) having a filter assembly for removing particulates in the exhaust gas, the PF device (24) selectively An electric heater (52) disposed upstream of the filter assembly and selectively energized to recover heat to the PF device (24). a primary energy storage device (42); a single secondary energy storage device (44) selectively connected to the primary energy storage device (42), wherein the individual secondary energy storage device (44) selectively energizes the electrical heater (52); anda control module (70) in communication with the electric heater (52), the primary storage device (42), the individual secondary energy storage device (44), and the internal combustion engine (12), the control module (70) receiving a regeneration signal indicative of the amount Indicating particulate trapped in the filter assembly of the PF device (24), the control module (70) comprising: control logic for separating the individual secondary energy storage device (44) from the primary storage device if the internal combustion engine (12) in the engine Off state is; and control logic for connecting the single secondary energy storage device (44) to the electric heater (52) if the regeneration signal is received; a sensor (72, 76) in communication with the exhaust line (14) to detect an operating state of the PF device (24 ), wherein the at least one sensor (72, 76) generates the regeneration signal indicative of the amount of particulates trapped in the filter assembly of the PF device (24), the internal combustion engine (12) comprising an engine input. State and the primary energy storage device (42) is selectively connected to the single secondary energy storage device (44) in the engine on state, the primary energy storage device (42) and the secondary energy storage device (44) each having a state of charge ("SOC"). and wherein the primary energy storage device (42) charges the single secondary energy storage device (44) when the internal combustion engine Engine (12) is in the engine on state if the SOC of the primary energy storage device (42) is above a primary threshold level and if the secondary energy storage device (44) is below a secondary threshold level.