Systems and methods for particulate filter cleaning
AssigneeFord Global Technologies, LLC
InventorsDouglas Raymond Martin, Tyler Kelly, Timothy Stolzenfeld
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for cleaning an exhaust particulate filter by routing air via the exhaust particulate filter during a vehicle-off condition. In one example, during vehicle-off conditions, a turbocharger may be reverse rotated via an electric motor or an engine may be reverse rotated via an electric machine to route air via the exhaust particulate filter and the soot collected from the particulate filter may then be deposited on an air filter coupled to the intake manifold. During a subsequent engine start, the soot from the intake air filter may be routed to the engine cylinders for combustion.
Claims20
A method comprising:
- routing exhaust gases from an engine through a particulate filter (PF);
- and
- flowing ambient air from an exhaust outlet through the PF;
- and then
- routing the ambient air from the PF through an air filter of an intake manifold.
An engine method comprising:
- during an engine-off condition;
- flowing air from a tailpipe to an intake air filter;
- removing particulate matter from an exhaust particulate filter (PF) using the flowing air;
- depositing the particulate matter on the intake air filter using the flowing air;
- and
- rotating one or both of an exhaust turbine and an intake air compressor in a reverse direction to flow the air.
A vehicle system, comprising:
- an engine including one or more cylinders;
- an intake manifold including an intake air filter;
- a particulate filter (PF) coupled to an exhaust passage,
- a turbocharger including a compressor and a turbine;
- a compressor recirculation passage;
- an exhaust gas recirculation (EGR) passage;
- and
- a controller with computer readable instructions stored on non-transitory memory for:
- responsive to an amount of soot deposited on the PF being higher than a threshold and a vehicle key-off condition,
- routing air through the PF, and then through the intake air filter via either the EGR passage or the one or more cylinders, and one or more of the compressor and the compressor recirculation passage.
Dependencies are inferred from the claim text.