Control of exhaust flow in an engine including a particulate filter
AssigneeFord Global Technologies, LLC
InventorMichiel J. Van Nieuwstadt
Life of this patent
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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.
Claims19
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 include 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.
The method of claim 11, wherein the engine operating parameter is an air-fuel ratio of an initial combustion of the engine start.
A method for a turbocharged engine, comprising:
- 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 an intake manifold.
A system for controlling operation of exhaust of an engine in a vehicle, comprising:
- 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 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 stored vacuum.
Dependencies are inferred from the claim text.