Control of exhaust flow in an engine including a particulate filter
First Claim
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1. A method for a turbocharged engine, comprising:
- generating vacuum during engine operation;
storing the vacuum;
during or after engine shutdown, drawing ambient air through a particulate filter via the stored vacuum and closing a tailpipe valve downstream of the particulate filter, the drawing including drawing the ambient air from an intake system, through an LP-EGR system to the particulate filter to regenerate the particulate filter, and through an HP-EGR system to an intake manifold.
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Abstract
Methods and systems for controlling operation of exhaust of an engine including a particulate filter are provided. One example method includes generating vacuum during engine operation, and storing the vacuum. The method further includes, during or after engine shutdown, drawing ambient air through the particulate filter via the vacuum.
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Citations
19 Claims
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1. A method for a turbocharged engine, comprising:
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generating vacuum during engine operation; storing the vacuum; during or after engine shutdown, drawing ambient air through a particulate filter via the stored vacuum and closing a tailpipe valve downstream of the particulate filter, the drawing including drawing the ambient air from an intake system, through an LP-EGR system to the particulate filter to regenerate the particulate filter, and through an HP-EGR system to an intake manifold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for a turbocharged engine, comprising:
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generating vacuum in an intake manifold during engine operation; storing the vacuum; during or after engine shutdown, drawing ambient air through a particulate filter via the stored vacuum, drawing the ambient air including drawing the ambient air in from a tailpipe, through the particulate filter, and then through an EGR system to the intake manifold. - View Dependent Claims (10, 11, 12)
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13. A system for controlling operation of exhaust of an engine in a vehicle, comprising:
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an intake manifold upstream of a cylinder of the engine; a turbocharger coupled to the engine; a particulate filter downstream of the cylinder; and an electronic controller with instructions stored in non-transitory memory configured to adjust engine actuators to; generate vacuum during engine operation, store the vacuum in the intake manifold, and during or after an engine shutdown, draw ambient air through the particulate filter via the stored vacuum. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification