Method and system for emission control of a compression ignition locomotive engine

1. A method for controlling an emission level of a compression ignition engine equipped with an electronic fuel injection system, comprising:

measuring an actual power level of the engine;

comparing a desired power level with said actual power level of the engine;

implementing a combustion strategy based on the comparing of said desired and actual power levels; and

implementing an emission strategy based on said combustion strategy, wherein said emission strategy is intended to attain a predetermined emission level in exhaust from the engine.

2. The method according to claim 1 , wherein the implementing of a combustion strategy comprises:

injecting a pilot charge into a combustion cylinder of the engine;

forming a premixed charge from said pilot charge;

injecting a main charge into the combustion cylinder of the engine, wherein said main charge may initiate combustion of said premixed charge formed by said pilot charge; and

monitoring a predetermined attribute in relation to combustion of said homogeneous charge and said main charge.

3. The method according to claim 2 , wherein said a premixed charge comprises mixing a charge of a combustion fuel and air in a predetermined proportion.

4. The method according to claim 3 , wherein said mixing comprises mixing the fuel and air homogeneously.

5. The method according to claim 3 , wherein said mixing comprises mixing the fuel and air in a predetermined stratification.

6. The method according to claim 2 , wherein said predetermined attribute is a crank angle position at an instant of an injection of said pilot charge or said main charge into the combustion cylinder of the engine.

7. The method according to claim 2 , wherein said predetermined attribute is a retard time in relation to an instant of beginning of an injection of a main charge into the combustion cylinder of the engine.

8. The method according to claim 2 , wherein implementing said combustion strategy further comprises implementing a combustion strategy for a two-stroke engine.

9. The method according to claim 8 , wherein implementing said combustion strategy further comprises implementing a combustion strategy for increasing a compression ratio.

10. The method according to claim 8 , wherein implementing said combustion strategy further comprises implementing a combustion strategy for reducing manifold air temperature in the engine.

11. The method according to claim 8 , further comprising designing a ring pack for reducing consumption of lubricating oil used in the combustion cylinder of the engine.

12. The method according to claim 2 , wherein implementing said combustion strategy further comprises implementing a combustion strategy for a four-stroke engine.

13. The method according to claim 12 , further comprising designing an injector needle sac for the engine, wherein volume of the injector needle sac is a minimum.

14. The method according to claim 12 , further comprising monitoring degradation of manifold air temperature in the engine in relation to a predetermined reference temperature.

15. The method according to claim 14 , further comprising changing a quantity of said pilot charge when said manifold air temperature exceeds said predetermined reference temperature.

16. The method according to claim 14 , further comprising issuing an alert when said manifold air temperature exceeds said predetermined reference temperature.

17. The method according to claim 16 , wherein issuing an alert comprises issuing a warning to check a cooling system of the engine.

18. The method according to claim 1 , further comprising treating the exhaust from the engine.

19. The method according to claim 18 , wherein said treating comprises oxidizing an undesired compound present in the exhaust from the engine.

20. The method according to claim 19 , wherein said oxidizing comprises oxidizing a hydrocarbon compound present in the exhaust from the engine.

21. The method according to claim 19 , wherein said oxidizing comprises oxidizing a carbon monoxide compound present in the exhaust from the engine.

22. The method according to claim 1 , wherein said predetermined emission level is a Tier-2 emission level for locomotive engines.