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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 i

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.

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What is claimed is: 1. 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 extending an open duration of an intak

What is claimed is: 1. 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 extending an open duration of an intake valve in fluid communication with a combustion chamber beyond a normal duratio in response to the change in pressure to increase a temperature of the exhaust gases passing through the PM filter. 2. A method, as set forth in claim 1, wherein extending an open duration of an intake valve includes the step of extending an open duration of the intake valve in response to the change in pressure being greater than a predetermined threshold. 3. A method, as set forth in claim 1, wherein extending the open duration beyond a normal duration includes the step of extending the open duration into a portion of a compression stroke of the internal combustion engine. 4. A method, as set forth in claim 1, further including the step of returning the open duration of the intake valve to the normal duration in response to the change in pressure being less than the predetermined threshold. 5. A method, as set forth in claim 1, further including the step of varying a throttle valve located in an intake passageway in cooperation with varying the opening of the intake valve. 6. A method, as set forth in claim 1, wherein determining a change in pressure includes the step of sensing a difference in pressure of the exhaust gases passing through the PM filter. 7. A method, as set forth in claim 1, wherein determining a change in pressure includes the step of estimating a change in pressure as a function of at least one parameter associated with the internal combustion engine. 8. A method, as set forth in claim 2, further including the step of determining a flow of exhaust gases passing through the PM filter. 9. A method, as set forth in claim 8, further including the step of varying the opening of the intake valve in response to at least one of the change in pressure and the change in flow of exhaust gases being greater than the predetermined threshold. 10. 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 predetermined threshold to reduce an amount of air available for combustion. 11. A method, as set forth in claim 10, wherein extending the open duration includes the step of extending the open duration into a portion of a compression stroke of the internal combustion engine. 12. A method, as set forth in claim 10, further including the step of returning the open duration of the intake valve to a normal open duration in response to the change in pressure being less than a second predetermined threshold. 13. A method, as set forth in claim 12, further including the steps of: controlling a throttle valve to reduce a flow of air through an intake passageway in cooperation with the open duration of the intake valve being extended; and returning the throttle valve to a position to allow a normal flow of air through the intake passageway in cooperation with the open duration of the intake valve returning to the normal open duration. 14. 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 extending an open duration of the intake valve in response to the change in pressure to increase a fuel to air ratio. 15. An apparatus, as set forth in claim 14, further including: an intake passageway located in fluid communication with the intake valve; and a throttle valve located within the intake passageway. 16. An apparatus, as set forth in claim 15, wherein the throttle valve is actuated by the controller in cooperation with the extended open duration of the intake valve. 17. An apparatus, as set forth in claim 14, wherein the means for determining a change in pressure includes a pressure sensor. 18. An apparatus, as set forth in claim 14, further including means for determining a flow of exhaust gases passing through the PM filter. 19. An apparatus, as set forth in claim 18, wherein the means for determining a flow of exhaust gases includes a flow sensor. 20. An apparatus, as set forth in claim 18, wherein the controller is adapted to extend the open duration of the intake valve beyond a normal open duration in response to determining at least one of the change in pressure of the exhaust gases and the change in flow of exhaust gases being greater than a predetermined threshold. 21. An apparatus, as set forth in claim 20, wherein the extended open duration is a portion of a compression stroke of the internal combustion engine. 22. 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 to increase a temperature of the gases passing through the PM filter. 23. An apparatus, as set forth in claim 22, further including: an intake passageway located in fluid communication with the intake valve; and a throttle valve located within the intake passageway, wherein the throttle valve is actuated by the controller in cooperation with the extended open duration of the intake valve. 24. An apparatus, as set forth in claim 22, wherein the means for determining a change in pressure includes a pressure sensor. 25. An apparatus, as set forth in claim 22, further including means for determining a flow of exhaust gases passing through the PM filter. 26. An apparatus, as set forth in claim 25, wherein the means for determining a flow of exhaust gases includes a flow sensor. 27. An apparatus, as set forth in claim 22, wherein the controller is adapted to extend the open duration of the intake valve beyond a normal open duration in response to determining at least one of the pressure of the exhaust gases in the PM filter increasing above a predetermined threshold and the flow of exhaust gases through the PM filter decreasing below another predetermined threshold. 28. An apparatus, as set forth in claim 27, wherein the extended open duration is a portion of a compression stroke of the internal combustion engine.