An exhaust system for use with an engine is disclosed. The exhaust system may have a first treatment device configured to receive a flow of exhaust from the engine and convert a first constituent of the exhaust to a second constituent. The exhaust system may also have a second treatment device locat
An exhaust system for use with an engine is disclosed. The exhaust system may have a first treatment device configured to receive a flow of exhaust from the engine and convert a first constituent of the exhaust to a second constituent. The exhaust system may also have a second treatment device located downstream of the first treatment device and configured to reduce the first constituent and the second constituent. The exhaust system may further have a flow regulator configured to selectively vary a rate of exhaust passing through the first treatment device, and a controller configured to operate the flow regulator such that a desired amount of the first constituent and the second constituent is received by the second treatment device.
대표청구항▼
1. An exhaust system, comprising: a first treatment device configured to receive a flow of exhaust and convert a first constituent of the exhaust to a second constituent;a second treatment device located downstream of the first treatment device and configured to reduce the first constituent and the
1. An exhaust system, comprising: a first treatment device configured to receive a flow of exhaust and convert a first constituent of the exhaust to a second constituent;a second treatment device located downstream of the first treatment device and configured to reduce the first constituent and the second constituent;a flow regulator configured to selectively vary a rate of exhaust passing through the first treatment device while maintaining a combination of a quantity of exhaust passing through the first treatment device and a quantity of reductant added to the exhaust equal to a quantity of exhaust passing through the second treatment device;a controller configured to operate the flow regulator such that a desired amount of the first constituent and the second constituent is received by the second treatment device;a turbocharger disposed upstream of the first treatment device; andan actuator connected to the turbocharger and configured to adjust a position of one of a vane and a nozzle ring of the turbocharger, wherein the flow regulator is configured to vary the rate of the exhaust passing through the first treatment device by affecting operation of the actuator. 2. The exhaust system of claim 1, wherein the flow regulator varies a dwell time of the exhaust within the first treatment device by varying the rate of the exhaust passing through the first treatment device, the dwell time affecting a conversion efficiency of the first treatment device. 3. The exhaust system of claim 1, wherein the flow regulator also varies the rate of the exhaust passing through the first treatment device by restricting a flow of gas into an engine that produces the exhaust. 4. The exhaust system of claim 1, wherein the first treatment device is a diesel oxidation catalyst and the second treatment device is an SCR device. 5. The exhaust system of claim 1, further including an engine directing the flow of exhaust to the first treatment device; and a throttle valve fluidly connected to an inlet of the engine, wherein the flow regulator is configured to vary the rate of the exhaust passing through the first treatment device by affecting operation of the throttle valve based on a reduction effectiveness of the second treatment device. 6. The exhaust system of claim 1, wherein the flow regulator is formed integral with the actuator. 7. The exhaust system of claim 1, wherein the flow regulator is configured to vary a ratio of NO to NO2 in the exhaust received by the second treatment device while maintaining the combination of the quantity of exhaust passing through the first treatment device and the quantity of reductant added to the exhaust equal to the quantity of exhaust passing through the second treatment device. 8. The exhaust system of claim 1, wherein the first and second constituents are oxides of nitrogen. 9. The exhaust system of claim 8, wherein the desired amount is a ratio of NO to NO2. 10. The exhaust system of claim 9, wherein the ratio is about 1:1. 11. The exhaust system of claim 1, further including a sensor configured to generate a signal indicative of a characteristic of the exhaust, wherein the controller operates the flow regulator based at least partially on the signal. 12. The exhaust system of claim 11, wherein the signal is indicative of an amount of at least one of the first and second constituents in the exhaust flow. 13. The exhaust system of claim 12, wherein the sensor is a virtual sensor. 14. The exhaust system of claim 13, wherein the amount of the at least one of the first and second constituents is determined based on known operating conditions of an engine that produces the exhaust. 15. The exhaust system of claim 1, wherein the controller is configured to selectively vary operation of the flow regulator and the actuator in response to a signal indicative of a NOx level of the exhaust. 16. The exhaust system of claim 15, wherein selectively varying operation of the actuator comprises varying a flow area of the turbocharger in response to the signal and based on a reduction effectiveness of the second treatment device. 17. A method of operating an engine, comprising: combusting fuel with the engine to produce a flow of exhaust;passing the exhaust through a first catalyst to convert a first constituent of the exhaust to a second constituent;reducing the first constituent and the second constituent at a second catalyst downstream of the first catalyst; andselectively varying a dwell time of the exhaust within the first catalyst such that a desired amount of the first constituent is converted to the second constituent,wherein an effectiveness of reducing the first and second constituents is at least partially dependent on the desired amount;wherein the engine includes a turbocharger and an actuator, and the turbocharger includes one of a vane and a nozzle ring, the actuator configured to adjust a position of the one of the vane and the nozzle ring; andwherein selectively varying the dwell time of the exhaust within the first catalyst is accomplished by controlling a flow regulator to selectively vary a rate of exhaust passing through the first catalyst by affecting operation of the actuator, the flow regulator selectively varying the rate of exhaust passing through the first catalyst while maintaining a combination of a quantity of exhaust passing through the first catalyst and a quantity of reductant added to the exhaust equal to a quantity of exhaust passing through the second catalyst. 18. The method of claim 17, wherein the first catalyst is a diesel oxidation catalyst. 19. The method of claim 17, wherein selectively varying the dwell time of the exhaust within the first catalyst is accomplished by controlling the flow regulator to affect operation of a throttle valve fluidly connected to an inlet of the engine based on a reduction effectiveness of the second treatment device. 20. The method of claim 17, wherein the first and second constituents are oxides of nitrogen. 21. The method of claim 20, wherein the desired amount is a ratio of NO to NO2. 22. The method of claim 21, wherein the ratio is about 1:1. 23. The method of claim 17, further including sensing a characteristic of the exhaust, wherein the dwell time is varied based at least partially on the characteristic. 24. The method of claim 23, further including calculating an amount of the first constituent converted to the second constituent based at least partially on the sensed characteristic and known operating conditions of the engine. 25. A power system, comprising: an engine including an actuator, the engine configured to combust fuel and produce a flow of exhaust;a turbocharger including one of a vane and a nozzle ring, the turbocharger receiving the flow of exhaust from the engine;a passageway configured to direct exhaust away from the engine to the atmosphere;an oxidation catalyst disposed within the passageway and receiving the flow of exhaust from the turbocharger, the oxidation catalyst configured to convert NO to NO2 ;an SCR device located within the passageway downstream of the diesel oxidation catalyst and configured to reduce NO and NO2 to elemental components;a flow regulator configured to selectively vary a dwell time of the exhaust within the diesel oxidation catalyst; anda controller configured to receive a signal indicative of a NOx level of the exhaust and to operate the flow regulator based on the signal such that a desired ratio of NO:NO2of about 1:1 is received by the SCR device;wherein the flow regulator is configured to selectively vary the dwell time of the exhaust within the diesel oxidation catalyst by restricting a flow of gas into the engine, thereby varying the rate of the exhaust passing through the oxidation catalyst,wherein the flow regulator is also configured to vary the rate of the exhaust passing through the oxidation catalyst by operating the actuator to adjust a position of the one of the vane and the nozzle ring in response to a command received from the controller based on the signal, andwherein the flow regulator is further configured to vary the rate of the exhaust passing through the oxidation catalyst while maintaining a combination of a quantity of the exhaust passing through the oxidation catalyst and a quantity of reductant added to the exhaust equal to a quantity of the exhaust passing through the SCR device. 26. The power system of claim 25, wherein the flow regulator is configured to vary the dwell time of the exhaust within the oxidation catalyst by affecting operation of a throttle valve fluidly connected to an inlet of the engine.
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