Method and apparatus for PM filter regeneration
AssigneeCaterpillar Inc.
InventorsCornelius N. Opris, Maarten Verkiel
Life of this patent
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Abstract
A method and apparatus for initiating regeneration of a particulate matter (PM) filter in an exhaust system in an internal combustion engine. The method and apparatus includes determining a change in pressure of exhaust gases passing through the PM filter, and responsively varying an opening of an intake valve in fluid communication with a combustion chamber.
Claims35
A method for initiating regeneration of a particulate matter (PM) filter in an exhaust system in an internal combustion engine, including the steps of:
- determining a change in pressure of exhaust gases passing through the PM filter;
- and
- responsively varying an opening of an intake valve in fluid communication with a combustion chamber.
A method for initiating regeneration of a particulate matter (PM) filter in an EGR system in an internal combustion engine, including the steps of:
- determining a change in pressure of exhaust gases passing through the PM filter;
- and
- extending an open duration of an intake valve in fluid communication with a combustion chamber in response to the change in pressure being greater than a first predetermined threshold.
A method for initiating regeneration of a particulate matter (PM) filter in an EGR system in an internal combustion engine, including the steps of:
- determining a change in pressure of exhaust gases passing through the PM filter;
- and
- extending an open position of an intake valve in fluid communication with a combustion chamber in response to the change in pressure being greater than a first predetermined threshold.
An apparatus for initiating regeneration of a particulate matter (PM) filter in an EGR system in an internal combustion engine having a combustion chamber and an intake valve in fluid communication thereof, comprising:
- means for determining a change in pressure of exhaust gases passing through the PM filter;
- and
- a controller for responsively varying an opening of the intake valve.
An apparatus for initiating regeneration of a particulate matter (PM) filter in an EGR system in an internal combustion engine, comprising:
- a combustion chamber located in the engine;
- an intake valve in fluid communication with the combustion chamber;
- a variable intake valve closing mechanism configured to keep the intake valve open by selective operation of the variable intake valve closing mechanism;
- means for determining a change in pressure of exhaust gases passing through the PM filter;
- and
- a controller for actuating the variable intake valve closing mechanism to extend the open duration of the intake valve in response to determining the change in pressure being greater than a predetermined threshold.
Dependencies are inferred from the claim text.