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An engine exhaust aftertreatment system including an catalyst-based device configured to reduce an amount of NOx in exhaust gases produced by an engine using reductant stored in the catalyst-based device. The system includes a controller configured to determine a starting quantity of stored reductan

An engine exhaust aftertreatment system including an catalyst-based device configured to reduce an amount of NOx in exhaust gases produced by an engine using reductant stored in the catalyst-based device. The system includes a controller configured to determine a starting quantity of stored reductant in the catalyst-based device at the start of the engine. The starting quantity is based on a shutdown quantity of stored reductant in the catalyst-based device determined at the shutdown of the engine.

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1. An engine exhaust aftertreatment system comprising: a catalyst-based device including a catalyst configured to reduce an amount of NOx in exhaust gases produced by an engine, by using reductant stored in the catalyst-based device; anda controller configured to determine a starting quantity of sto

1. An engine exhaust aftertreatment system comprising: a catalyst-based device including a catalyst configured to reduce an amount of NOx in exhaust gases produced by an engine, by using reductant stored in the catalyst-based device; anda controller configured to determine a starting quantity of stored reductant in the catalyst-based device at the start of the engine, the starting quantity is based on a shutdown quantity of stored reductant in the catalyst-based device determined at the shutdown of the engine, wherein the controller derives the starting quantity of stored reductant based on time of engine shutdown. 2. The engine exhaust aftertreatment system of claim 1 wherein the controller derives the starting quantity of stored reductant based on temperature of the catalyst-based device. 3. The engine exhaust aftertreatment system of claim 1 wherein the controller stores the shutdown quantity of stored reductant in memory during shutdown of the engine. 4. The engine exhaust aftertreatment system of claim 1 wherein the controller is configured to order a reductant injection once a predetermined low quantity of reductant is determined. 5. The engine exhaust aftertreatment system of claim 4 wherein the controller determines the low quantity of reductant has been reached based on: time;temperature of the catalyst-based device; andconcentration of NOx entering the catalyst-based device. 6. The engine exhaust aftertreatment system of claim 4 wherein the controller determines the low quantity of reductant has been reached based on a concentration of NOx exiting the catalyst-based device. 7. An engine exhaust aftertreatment system comprising: a catalyst-based device including a catalyst configured to reduce an amount of NOx in exhaust gases produced by an engine, by using reductant stored in the catalyst-based device; anda controller,configured to derive a starting quantity of stored reductant at the start of the engine, wherein the starting quantity is derived based on time of engine shutdown. 8. The engine exhaust aftertreatment system of claim 7 wherein the starting quantity is derived based on a shutdown quantity of stored reductant in the catalyst-based device determined at the shutdown of the engine. 9. The engine exhaust aftertreatment system of claim 7 wherein the starting quantity is derived based on temperature of the catalyst-based device. 10. The engine exhaust aftertreatment system of claim 7 wherein the controller stores the shutdown quantity of stored reductant in memory during shutdown of the engine. 11. The engine exhaust aftertreatment system of claim 7 wherein the controller is configured to order a reductant injection once a predetermined low quantity of reductant is determined. 12. The engine exhaust aftertreatment system of claim 11 wherein the controller determines the low quantity of reductant has been reached based on: time;temperature of the catalyst-based device; andconcentration of NOx entering the catalyst-based device. 13. The engine exhaust aftertreatment system of claim 11 wherein the controller determines the low quantity of reductant has been reached based on a concentration of NOx exiting the catalyst-based device. 14. A method of controlling a reductant injection into a catalyst-based device comprising: determining a shutdown quantity of stored reductant in the catalyst-based device;and deriving a starting quantity of stored reductant at the start of the engine based on the shutdown quantity, wherein the starting quantity is derived based on time of engine shutdown and temperature of the catalyst-based device. 15. The method of claim 14 further including storing the shutdown quantity of stored reductant in memory during shutdown of the engine. 16. The method of claim 14 further including ordering a reductant injection once a predetermined low quantity of reductant is determined. 17. The method of claim 16 further including determining wherein the low quantity of reductant has been reached based on: time;temperature of the catalyst-based device; andconcentration of NOx entering the catalyst-based device.