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 an engine including a particulate filter, comprising:
- generating vacuum during engine operation;
storing the vacuum;
during or after engine shutdown, drawing ambient air through the particulate filter via the vacuum.
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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
20 Claims
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1. A method for controlling operation of exhaust of an engine including a particulate filter, comprising:
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generating vacuum during engine operation; storing the vacuum; during or after engine shutdown, drawing ambient air through the particulate filter via the vacuum. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. 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; and an electronic controller configured 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 vacuum. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. 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 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 vacuum during engine rest.
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Specification