Control of exhaust flow in an engine including a particulate filter
First Claim
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1. A method for controlling operation of exhaust of a turbocharged engine including a particulate filter, comprising:
- generating vacuum in an intake manifold of the engine during engine operation by reducing engine boost;
storing the vacuum in the intake manifold;
during or after engine shutdown, drawing ambient air through the particulate filter via the stored vacuum through an exhaust gas recirculation passage of the engine.
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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
15 Claims
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1. A method for controlling operation of exhaust of a turbocharged engine including a particulate filter, comprising:
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generating vacuum in an intake manifold of the engine during engine operation by reducing engine boost; storing the vacuum in the intake manifold; during or after engine shutdown, drawing ambient air through the particulate filter via the stored vacuum through an exhaust gas recirculation passage of the engine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for controlling operation of exhaust of an engine in a vehicle, the system comprising:
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an intake manifold upstream of a cylinder of the engine; a particulate filter downstream of the cylinder; one or more valves; a turbocharger, an LP-EGR system, and an HP-EGR system; and an electronic controller configured to; generate vacuum during engine operation, store the vacuum in the intake manifold, during or after an engine shutdown, draw ambient air through the particulate filter via the stored vacuum; adjust an amount of ambient air drawn through the particulate filter by adjusting the one or more valves; and adjust the one or more valves to draw the ambient air in through an intake system, through the LP-EGR system to the particulate filter to regenerate the particulate filter, and through the HP-EGR system to the intake manifold, via the vacuum in the intake manifold. - View Dependent Claims (13, 14)
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15. A method for controlling operation of exhaust of an engine including a particulate filter, comprising:
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during a first operating condition; generating a vacuum during engine operation; storing the vacuum; during or after an engine shutdown from the first operating condition, drawing ambient air through the particulate filter via the stored vacuum to at least partially regenerate the particulate filter; and during a second operating condition; shutting down the engine with less vacuum compared to the vacuum generated during the first operating condition, wherein the shutting down is carried out without drawing ambient air through the particulate filter via the less stored vacuum during engine rest.
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Specification