Method for regenerating a particulate filter for a boosted direct injection engine
First Claim
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1. 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.
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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.
31 Citations
22 Claims
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1. 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for regenerating a particulate filter of a direct injection gasoline engine, comprising:
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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. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. 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. - View Dependent Claims (17, 18, 19, 20, 21, 22)
Specification