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One embodiment is a method including maintaining a count based upon an engine operating condition, determining a soot level based upon a characteristic of a diesel particulate filter, and requesting deSoot based upon the count meeting or exceeding a threshold, or the soot level meeting or exceeding

One embodiment is a method including maintaining a count based upon an engine operating condition, determining a soot level based upon a characteristic of a diesel particulate filter, and requesting deSoot based upon the count meeting or exceeding a threshold, or the soot level meeting or exceeding a threshold, or both. Further embodiments, forms, objects, features, advantages, aspects, and benefits shall become apparent from the following description and drawings.

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What is claimed is: 1. A method comprising: maintaining a count based upon an engine operating condition, wherein the maintaining a count based upon an engine operating condition includes incrementing or decrementing the count at a first rate if the engine speed exceeds a first threshold; determini

What is claimed is: 1. A method comprising: maintaining a count based upon an engine operating condition, wherein the maintaining a count based upon an engine operating condition includes incrementing or decrementing the count at a first rate if the engine speed exceeds a first threshold; determining a soot level based upon a characteristic of a diesel particulate filter; requesting deSoot based upon the count meeting or exceeding a threshold, or the soot level meeting or exceeding a threshold, or both. 2. A method according to claim 1 wherein the determining a soot level based upon a characteristic of a diesel particulate filter includes determining a soot level based upon a pressure differential across a diesel particulate filter. 3. A method according to claim 1 wherein the determining a soot level based upon a characteristic of a diesel particulate filter includes determining a soot level based upon an airflow rate across or through a diesel particulate filter. 4. A method according to claim 1 wherein the determining a soot level based upon a characteristic of a diesel particulate filter includes determining a soot level based upon a pressure differential across the diesel particulate filter and an airflow rate of the diesel particulate filter. 5. A method according to claim 1 wherein the maintaining a count based upon an engine operating condition further includes incrementing or decrementing the count at an increased rate if engine operation becomes air limited, the engine is operating in a deNOx mode, or the engine is operating in a deSOx mode. 6. A method according to claim 1 further comprising determining if engine temperature meets or exceeds a threshold, or engine air flow meets or exceeds a threshold, or both; wherein said determining a soot level occurs only if engine temperature meets or exceeds a threshold, or engine air flow meets or exceeds a threshold, or both. 7. A system comprising: a diesel particulate filter treating an exhaust of an engine; a pressure sensor operable to sense a pressure of the diesel particulate filter; a processor operable to receive information of the pressure sensor; and a flow sensor operable to sense a flow of the diesel particulate filter; wherein the processor is operable to perform a first evaluation of a count and a count threshold, to perform a second evaluation of a soot load and a soot load threshold, and to instruct deSoot based upon the first evaluation or the second evaluation; and wherein the processor is further operable to perform the first evaluation of the count by incrementing or decrementing the count at a first rate if an engine speed exceeds a first threshold. 8. A system according to claim 7 wherein the pressure sensor is operable to sense a pressure differential across the diesel particulate filter. 9. A system according to claim 7 wherein the diesel particulate filter is a catalyzed soot filter. 10. The system according to claim 7, wherein the processor is further operable to perform the first evaluation of the count by incrementing or decrementing the count at an increased rate if an engine operation becomes air limited. 11. The system according to claim 7, wherein the processor is further operable to perform the first evaluation of the count by incrementing or decrementing the count at an increased rate if the engine is operating in a deNOx mode. 12. The system according to claim 7, wherein the processor is further operable to perform the first evaluation of the count by incrementing or decrementing the count at an increased rate if the engine is operating in a deSOx mode. 13. The system according to claim 7, wherein the processor is further operable to perform the first evaluation of the count by incrementing or decrementing the count at an increased rate if engine operation becomes air limited, the engine is operating in a deNOx mode, or the engine is operating in a deSOx mode. 14. A system according to claim 7 wherein the processor is a component of an engine control unit (ECU). 15. A system according to claim 14 wherein the engine is a diesel engine wherein the ECU is operatively coupled to the diesel engine. 16. A system according to claim 15 further comprising a vehicle wherein the diesel engine is operatively coupled to the vehicle. 17. A method comprising: maintaining a count based upon an engine operating condition, wherein the maintaining a count based upon an engine operating condition includes incrementing or decrementing the count at an increased rate if engine operation becomes air limited; determining a soot level based upon a characteristic of a diesel particulate filter; requesting deSoot based upon the count meeting or exceeding a threshold, or the soot level meeting or exceeding a threshold, or both. 18. A method according to claim 17 wherein the determining a soot level based upon a characteristic of a diesel particulate filter includes determining a soot level based upon a pressure differential across a diesel particulate filter. 19. A method according to claim 17 wherein the determining a soot level based upon a characteristic of a diesel particulate filter includes determining a soot level based upon an airflow rate across or through a diesel particulate filter. 20. A method according to claim 17 wherein the determining a soot level based upon a characteristic of a diesel particulate filter includes determining a soot level based upon a pressure differential across the diesel particulate filter and an airflow rate of the diesel particulate filter. 21. A method according to claim 17 wherein the maintaining a count based upon an engine operating condition includes incrementing or decrementing the count at a first rate if the engine speed exceeds a first threshold. 22. A method according to claim 17 further comprising determining if engine temperature meets or exceeds a threshold, or engine air flow meets or exceeds a threshold, or both; wherein said determining a soot level occurs only if engine temperature meets or exceeds a threshold, or engine air flow meets or exceeds a threshold, or both. 23. A method comprising: maintaining a count based upon an engine operating condition, wherein the maintaining a count based upon an engine operating condition includes incrementing or decrementing the count at an increased rate if the engine is operating in a deNOx mode; determining a soot level based upon a characteristic of a diesel particulate filter; requesting deSoot based upon the count meeting or exceeding a threshold, or the soot level meeting or exceeding a threshold, or both. 24. A method according to claim 23 wherein the determining a soot level based upon a characteristic of a diesel particulate filter includes determining a soot level based upon a pressure differential across a diesel particulate filter. 25. A method according to claim 23 wherein the determining a soot level based upon a characteristic of a diesel particulate filter includes determining a soot level based upon an airflow rate across or through a diesel particulate filter. 26. A method according to claim 23 wherein the determining a soot level based upon a characteristic of a diesel particulate filter includes determining a soot level based upon a pressure differential across the diesel particulate filter and an airflow rate of the diesel particulate filter. 27. A method according to claim 23 further comprising determining if engine temperature meets or exceeds a threshold, or engine air flow meets or exceeds a threshold, or both; wherein said determining a soot level occurs only if engine temperature meets or exceeds a threshold, or engine air flow meets or exceeds a threshold, or both. 28. A method comprising: maintaining a count based upon an engine operating condition, wherein the maintaining a count based upon an engine operating condition includes incrementing or decrementing the count at an increased rate if the engine is operating in a deSOx mode; determining a soot level based upon a characteristic of a diesel particulate filter; and requesting deSoot based upon the count meeting or exceeding a threshold, or the soot level meeting or exceeding a threshold, or both. 29. A method according to claim 28 wherein the determining a soot level based upon a characteristic of a diesel particulate filter includes determining a soot level based upon a pressure differential across a diesel particulate filter. 30. A method according to claim 28 wherein the determining a soot level based upon a characteristic of a diesel particulate filter includes determining a soot level based upon an airflow rate across or through a diesel particulate filter. 31. A method according to claim 28 wherein the determining a soot level based upon a characteristic of a diesel particulate filter includes determining a soot level based upon a pressure differential across the diesel particulate filter and an airflow rate of the diesel particulate filter. 32. A method according to claim 28 further comprising determining if engine temperature meets or exceeds a threshold, or engine air flow meets or exceeds a threshold, or both; wherein said determining a soot level occurs only if engine temperature meets or exceeds a threshold, or engine air flow meets or exceeds a threshold, or both.