Method for regenerating particulate filter
AssigneeHino Motors, Ltd.
InventorsTatsuki Igarashi, Kiyohiro Shimokawa
Life of this patent
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Abstract
Fuel is added to exhaust gas 9 upstream of a catalytic regeneration type particulate filter 13 in an exhaust pipe 11. The fuel added is oxidized on a flow-through type oxidization catalyst 14 before the particulate filter 13 to generate exothermic heat with which captured and accumulated particulates in the particulate filter 13 are burned off to forcibly regenerate the particulate filter 13. When the driving is being performed in light-load engine operation areas upon forcible regeneration of the particulate filter 13, a retarder 22 is activated, with an accelerator pedal retaining its on-state, and an amount of fuel injected is increased to compensate reduction of torque due to such activation of the retarder 22.
Claims5
A method for forcibly regenerating a catalytic regeneration type particulate filter in an exhaust pipe through which exhaust gas flows, by adding fuel to the exhaust gas upstream of the particulate filter, the added fuel being oxidized on a flow-through type oxidation catalyst before the particulate filter to produce exothermic heat with which captured and accumulated particulates in the particulate filter are burned off, thereby forcibly regenerating the particulate filter, the method comprising, in light-load engine operation areas upon forcible regeneration of the particulate filter, intentionally increasing an engine load by load adding means and increasing an amount of fuel injected so as to compensate reduced torque due to the increased engine load.
Dependencies are inferred from the claim text.