Engine system with passive regeneration of a filter in EGR loop

1. An engine system, comprising:

an intake manifold configured to direct air into a donor cylinder and a non-donor cylinder of an engine;

a first exhaust manifold configured to direct exhaust from the non-donor cylinder to the atmosphere;

a second exhaust manifold configured to receive exhaust from the donor cylinder;

a control valve configured to selectively direct a first amount of exhaust from the second exhaust manifold to the intake manifold;

an after-treatment component configured to treat the first amount of exhaust; and

a controller configured to adjust a first operating parameter of the donor cylinder such that a ratio of an amount of a gaseous component and an amount of particulate matter in the first amount of exhaust is about equal to a predetermined value.

2. The exhaust system of claim 1 , wherein the after-treatment component includes:

a diesel particulate filter; and

a diesel oxidation catalyst disposed upstream of the diesel particulate filter.

3. The exhaust system of claim 2 , wherein the controller is further configured to adjust a second operating parameter of the non-donor cylinder.

4. The exhaust system of claim 3 , wherein the controller is further configured to adjust a position of the control valve to control the first amount of exhaust.

5. The exhaust system of claim 4 , wherein:

the first operating parameter is a first injection timing for the donor cylinder; and

the second operating parameter is a second injection timing for the non-donor cylinder.

6. The exhaust system of claim 5 , wherein the controller is configured to adjust the first injection timing and the second injection timing based on a load on the engine.

7. The exhaust system of claim 6 , wherein the controller is configured to adjust the first injection timing and the second injection timing based on a speed of the engine.

8. The engine of claim 4 , wherein the intake manifold includes:

a first section configured to direct a first mixture of a first portion of air and a donor cylinder portion of the first amount of exhaust to the donor cylinder; and

a second section configured to direct a second mixture of a second portion of air and a non-donor cylinder portion of the first amount of exhaust to the non-donor cylinder, wherein:

the first operating parameter is the donor cylinder portion; and

the second operating parameter is the non-donor cylinder portion.

9. A method of operating an engine, comprising:

compressing air;

directing compressed air through an intake manifold into a donor cylinder and a non-donor cylinder;

generating exhaust in the donor cylinder and the non-donor cylinder;

directing exhaust from the non-donor cylinder through a first exhaust manifold to the atmosphere;

directing exhaust from the donor cylinder to a second exhaust manifold;

selectively directing a first amount of exhaust from the second exhaust manifold to the intake manifold;

selectively adjusting a first operating parameter of the donor cylinder such that a ratio of an amount of a gaseous component and an amount of particulate matter in the first amount of exhaust is about equal to a predetermined value.

10. The method of claim 9 , further including adjusting a second operating parameter of the non-donor cylinder.

11. The method of claim 10 , further including directing a second amount of exhaust from the second exhaust manifold to the first exhaust manifold.

12. The method of claim 11 , further including determining the ratio based on an amount of nitrous oxide and an amount of soot.

13. The method of claim 12 , wherein:

adjusting the first operating parameter includes adjusting a first injection timing for the donor cylinder; and

adjusting the second operating parameter includes adjusting a second injection timing for the non-donor cylinder.

14. The method of claim 13 , further including:

determining a load on the engine; and

adjusting the first injection timing and the second injection timing based on the load.

15. The method of claim 14 , further including:

determining a speed of the engine; and

adjusting the first injection timing and the second injection timing based on the speed.

16. The method of claim 15 , further including:

determining the first injection timing based on a first set of data values, which relates the first injection timing to the load and the speed; and

determining the second injection timing based on a second set of data values, which relates the second injection timing to the load and the speed.

17. The method of claim 16 , wherein adjusting the first operating parameter includes adjusting an intake valve timing for the donor cylinder.

18. The method of claim 17 , further including adjusting a position of the control valve to regulate the first amount of exhaust.

19. The method of claim 18 , wherein adjusting the second operating parameter includes adjusting an intake valve timing for the non-donor cylinder.

20. The method of claim 12 , further including:

selectively directing a first mixture having an first concentration of exhaust to the donor cylinder; and

selectively directing a second mixture having a second concentration of exhaust to the non-donor cylinder.

21. The method of claim 20 , wherein:

the first mixture includes a first portion air and a donor cylinder portion of the first amount of exhaust and adjusting the first operating parameter includes adjusting the donor cylinder portion; and

the second mixture includes a second portion air and a non-donor cylinder portion of the first amount of exhaust and adjusting the second operating parameter includes adjusting the non-donor cylinder portion.

22. An engine, comprising:

at least one donor cylinder and at least one non-donor cylinder;

an intake manifold configured to direct air from the atmosphere to the donor cylinder and the non-donor cylinder;

a first exhaust manifold fluidly connected to the first non-donor cylinder;

a second exhaust manifold fluidly connected to the first donor cylinder;

a first control valve associated with the second exhaust manifold and selectively movable to allow a first amount of exhaust to pass from the second exhaust manifold into the first intake manifold;

a diesel particulate filter disposed between the second exhaust manifold and the intake manifold;

a diesel oxidation catalyst disposed upstream of the diesel particulate filter; and

a controller configured to adjust a first operating parameter of the donor cylinder such that a ratio of an amount of a gaseous component and an amount of particulate matter in the first amount of exhaust is about equal to a predetermined value.

23. The engine of claim 22 , wherein the first operating parameter is the first amount of exhaust.

24. The engine of claim 22 , wherein the controller is further configured to adjust a second operating parameter of the non-donor cylinder.

25. The engine of claim 24 , wherein the intake manifold includes:

a first section configured to direct a first mixture of a first portion of air and a donor cylinder portion of the first amount of exhaust to the first donor cylinder; and

a second section configured to direct a second mixture of a second portion of air and a non-donor cylinder portion of the first amount of exhaust to the first non-donor cylinder, wherein:

the first operating parameter is the donor cylinder portion; and

the second operating parameter is the non-donor cylinder portion.