Method for regenerating a particulate filter for a boosted direct injection engine
AssigneeFord Global Technologies, LLC
InventorsJames Michael Kerns, Ralph Wayne Cunningham, Helmut Hans Ruhland, Moritz Klaus Springer, Thomas Lorenz, Georg Louven, Jan Harmsen
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Abstract
A method for regenerating a particulate filter is disclosed. In one example, oxygen is pumped from the intake system of a direct injection turobocharged gasoline engine through a cylinder and into the exhaust system by a compressor. In this way, regeneration of a particulate filter may be accomplished without an auxiliary air supply.
Claims22
A method for regenerating a particulate filter of a direct injection gasoline engine, comprising:
- increasing an overlap between an intake valve and an exhaust valve of a cylinder and increasing boost to a level where an amount of air passes from an intake manifold to an exhaust system through the cylinder and does not participate in combustion in the cylinder in response to initiation of a particulate filter regeneration.
A method for regenerating a particulate filter of a direct injection gasoline engine, comprising:
- during initiation of particulate filter regenerating, increasing boost and intake valve and exhaust valve overlap of a cylinder in response to an oxygen concentration in an exhaust system, said oxygen concentration located downstream of a particulate filter;
- and
- enriching said cylinder's air-fuel mixture based on said oxygen concentration and an amount of air flowing through the cylinder during the overlap not participating in combustion.
A method for regenerating a particulate filter of a direct injection gasoline engine, comprising:
- during the regenerating:
- increasing intake valve and exhaust valve overlap of a cylinder in response to initiation of particulate filter regeneration;
- and
- adjusting a bias of a modulated fuel amount delivered to the cylinder in response to an oxygen concentration downstream of said particulate filter.
Dependencies are inferred from the claim text.