A method for reducing reductant deposits in an exhaust conduit fluidly coupled to an engine comprises operating the engine to produce an exhaust gas. The exhaust gas is communicated into the exhaust conduit which has an initial cross-sectional area. An initial flow rate corresponding to an initial f
A method for reducing reductant deposits in an exhaust conduit fluidly coupled to an engine comprises operating the engine to produce an exhaust gas. The exhaust gas is communicated into the exhaust conduit which has an initial cross-sectional area. An initial flow rate corresponding to an initial flow velocity of the exhaust gas entering the exhaust conduit is determined. The initial flow rate and, thereby the initial flow velocity of the exhaust gas, increases or decreases based on an operating condition of the engine. The initial flow rate of the exhaust gas is compared with a predetermined threshold. If the initial flow rate of the exhaust gas is lower than the predetermined threshold, a cross-sectional area of the exhaust conduit is reduced. The reducing of the cross-sectional area causes the exhaust gas to have an adjusted flow velocity greater than the initial flow velocity.
대표청구항▼
1. A method for reducing reductant deposits in an exhaust conduit fluidly coupled to an engine, the method comprising: operating the engine to produce an exhaust gas;communicating the exhaust gas into the exhaust conduit, wherein the exhaust conduit has an initial cross-sectional area and comprises
1. A method for reducing reductant deposits in an exhaust conduit fluidly coupled to an engine, the method comprising: operating the engine to produce an exhaust gas;communicating the exhaust gas into the exhaust conduit, wherein the exhaust conduit has an initial cross-sectional area and comprises a plurality of channels having a plurality of respective cross-sectional areas, each of the plurality of channels defined within the exhaust conduit and structured to allow at least a portion of the exhaust gas to pass therethrough, the initial cross-sectional area of the exhaust conduit corresponding to a sum of the cross-sectional area of each of the plurality of channels;determining, by interpreting an output signal from a flow rate sensor positioned proximate to an inlet of the exhaust conduit, an initial flow rate of the exhaust gas entering the exhaust conduit, the initial flow rate corresponding to an initial flow velocity of the exhaust gas entering the exhaust conduit, wherein the initial flow rate, and thereby the initial flow velocity of the exhaust gas,. increases or decreases based on an operating condition of the engine;comparing the initial flow rate of the exhaust gas with a predetermined threshold;if the initial flow rate of the exhaust gas is lower than the predetermined threshold, reducing the initial cross-sectional area of the exhaust conduit, the reducing of the initial cross-sectional area causing the exhaust gas to have an adjusted flow velocity greater than the initial flow velocity. 2. The method of claim 1, wherein the exhaust gas at the adjusted flow velocity exerts a shear stress on inner surfaces of the exhaust conduit to shear off any reductant pools or reductant deposits from inner surfaces of the exhaust conduit, and wherein the reducing the cross-sectional area of the exhaust conduit causes the shear stress to be maintained within a predetermined range irrespective of the initial flow rate of the exhaust gas. 3. The method of claim 1, further comprising: if the initial flow rate of the exhaust gas becomes equal to or exceeds the predetermined threshold, increasing the cross-sectional area of the exhaust conduit, the increasing of the cross- sectional area causing the exhaust gas to have an adjusted flow velocity equal to or different than the initial flow velocity. 4. The method of claim 1, wherein the reducing the initial cross-sectional area of the exhaust conduit includes closing a valve positioned on an inlet of at least one of the plurality of channels, the closing of the valve causing the exhaust gas to flow through only a portion of the plurality of channels so that the exhaust conduit has a reduced cross-sectional area corresponding to a sum of the cross-sectional areas of the portion of the plurality of channels. 5. The method of claim 4, wherein the plurality of channels are positioned in a radial array around a longitudinal axis of the exhaust conduit, and wherein the valve is positioned at an inlet of each of the plurality of channels. 6. The method of claim 1 wherein the exhaust conduit comprises: a first sidewall positioned within an inner volume defined by the exhaust conduit, the first sidewall positioned parallel to a longitudinal axis of the exhaust conduit, the first sidewall dividing the exhaust conduit into: a first channel of the plurality of channels, the first channel having a first cross-sectional area, anda second channel of the plurality of channels, the second channel parallel to the first channel and having a second cross-sectional area; andwherein the initial cross-sectional area of the exhaust conduit includes the first cross-sectional area of the first channel and the second cross-sectional area of the second channel, and wherein reducing the initial cross-sectional area of the exhaust conduit includes closing a first valve positioned at the inlet of the second channel, the closing of the first valve causing the initial cross-sectional area to be reduced to include only the first cross-sectional area. 7. The method of claim 6, wherein the method further includes: if the initial flow rate of the exhaust gas becomes equal to or exceeds the predetermined threshold, increasing the cross-sectional area of the exhaust conduit,wherein the increasing of the cross-sectional area includes opening the first valve to allow the exhaust gas to flow through each of the first channel and the second channel so that the exhaust gas has a second adjusted flow velocity in the first channel and the second channel equal to the initial flow velocity. 8. The method of claim 6, wherein the method further includes: if the initial flow rate of the exhaust gas becomes equal to or exceeds the predetermined threshold, increasing the cross-sectional area of the exhaust conduit, wherein the increasing of the cross-sectional area includes opening the first valve to allow the exhaust gas to flow through each of the first channel and the second channel so that the exhaust gas has a second adjusted flow velocity in the first channel and the second channel different than the initial flow velocity. 9. The method of claim 1, further comprising: a ramp positioned at an outlet of the second channel, the ramp structured to provide smooth flow transition of the exhaust gas from the first channel to an outlet of the exhaust conduit when the first valve is closed. 10. A method for reducing reductant deposits in an exhaust conduit fluidly coupled to an engine, the exhaust conduit comprising: a first sidewall positioned within an inner volume defined by the exhaust conduit, the first sidewall positioned parallel to a longitudinal axis of the exhaust conduit, the first sidewall dividing the exhaust conduit into a first channel having a first cross-sectional area and a second channel parallel to the first channel and having a second cross-sectional area, anda second sidewall positioned within the inner volume defined by the exhaust conduit, the second sidewall positioned parallel to the longitudinal axis of the exhaust conduit opposite the first sidewall, the second sidewall dividing the exhaust conduit into a third channel parallel to the first channel and having a third cross-sectional area,the method comprising: operating the engine to produce an exhaust gas;communicating the exhaust gas into the exhaust conduit, wherein the exhaust conduit has an initial cross-sectional area;determining an initial flow rate of the exhaust gas entering the exhaust conduit, the initial flow rate corresponding to an initial flow velocity of the exhaust gas entering the exhaust conduit, wherein the initial flow rate, and thereby the initial flow velocity of the exhaust gas, increases or decreases based on an operating condition of the engine;comparing the initial flow rate of the exhaust gas with a predetermined threshold;if the initial flow rate of the exhaust gas is lower than the predetermined threshold, reducing a cross-sectional area of the exhaust conduit, the reducing of the cross-sectional area causing the exhaust gas to have an adjusted flow velocity greater than the initial flow velocity;wherein the initial cross-sectional area of the exhaust conduit includes a sum of the first cross-sectional area of the first channel, the second cross-sectional area of the second channel and the third cross-sectional area of the third channel, and wherein reducing the initial cross-sectional area of the exhaust conduit includes closing a first valve positioned at the inlet of the second channel, and a second valve positioned at an inlet of the third channel, the closing of the first valve and the second valve causing the initial cross-sectional area to be reduced to include only the first cross-sectional area. 11. An exhaust aftertreatment system, comprising: a selective catalytic reduction configured to decompose constituents of an exhaust gas generated by an engine;an exhaust conduit fluidly coupled to the engine and the selective catalytic reduction system, the exhaust conduit defining a cross-sectional area and comprising a plurality of channels having a plurality of respective cross-sectional areas, each of the plurality of channels defined within the exhaust conduit and structured to allow at least a portion of the exhaust gas to pass therethrough, the cross-sectional area of the exhaust conduit corresponding to a sum of the cross-sectional area of each of the plurality of channels, the exhaust conduit structured to receive the exhaust gas at an initial flow rate, the initial flow rate corresponding to an initial flow velocity of the exhaust gas entering the exhaust conduit, the initial flow rate, and thereby the initial flow velocity of the exhaust gas, increasing or decreasing based on an operating condition of the engine;a cross-section adjusting valve operatively coupled to the exhaust conduit, the cross-section adjusting valve configured to increase or decrease the cross-sectional area of the exhaust conduit in response to determining, by interpreting an output signal from a flow rate sensor positioned proximate to an inlet of the exhaust conduit, the initial flow rate of the exhaust conduit, the increase or decrease of the cross-sectional area changing the initial flow velocity to an adjusted flow velocity different from the initial flow velocity; anda reductant insertion assembly fluidly coupled to the exhaust conduit and configured to selectively insert a reductant into the exhaust conduit. 12. The aftertreatment system of claim 11, wherein the cross-section adjusting valve is positioned at an inlet of at least one of the plurality of channels, and the aftertreatment system further comprising: a flow rate sensor positioned proximate to an inlet of the exhaust conduit; anda controllerconfigured to: interpret an output signal from the flow rate sensor indicative of the initial flow velocity of the exhaust gas,compare the initial flow rate of the exhaust gas with a predetermined threshold, the initial flow rate indicative of an initial flow velocity of the exhaust gas entering the exhaust conduit, andif the initial flow rate is lower than the predetermined threshold, instruct the valve to move into a closed position to close an inlet of at least one of the plurality of channels, the closing of the valve causing the exhaust gas to flow through only a portion of the plurality of channels so that the exhaust conduit has a reduced cross-sectional area corresponding to a sum of the cross-sectional areas of the portion of the plurality of channels. 13. The aftertreatment system of claim 12, wherein the plurality of channels are positioned in a radial array around a longitudinal axis of the exhaust conduit, and wherein the at valve is positioned at an inlet of each of the plurality of channels. 14. The aftertreatment system of claim 12, wherein the exhaust conduit further comprises a ramp positioned at an outlet of the second channel, the ramp structured to provide smooth flow transition of the exhaust gas from the first channel to an outlet of the exhaust conduit when the first valve is closed. 15. The aftertreatment system of claim 11, wherein the exhaust conduit further comprises: a first sidewall positioned within an inner volume defined by the exhaust conduit, the first sidewall positioned parallel to a longitudinal axis of the exhaust conduit, the first sidewall dividing the exhaust conduit into: a first channel of the plurality of channels, the first channel having a first cross-sectional area, anda second channel of the plurality of channels, the second channel parallel to the first channel and having a second cross-sectional area. 16. The aftertreatment system of claim 15, wherein the valve is a first valve positioned at a second channel inlet of the second channel, wherein the initial cross-sectional area of the exhaust conduit includes the first cross-sectional area of the first channel and the second cross-sectional area of the second channel, and wherein reducing the initial cross-sectional area of the exhaust conduit includes closing the first valve so that the initial cross-sectional area is reduced to include only the first cross-sectional area. 17. The aftertreatment system of claim 16, wherein the controller is further configured to: if the initial flow rate of the exhaust gas becomes equal to or exceeds the predetermined threshold, instructing the first valve to move into an open position, the opening of the first valve allowing the exhaust gas to flow through each of the first channel and the second channel so that the exhaust gas has a second adjusted flow velocity in the first channel and the second channel equal to the initial flow velocity. 18. The aftertreatment system of claim 16, wherein the exhaust conduit further comprises: a second sidewall positioned within the inner volume defined by the exhaust conduit, the second sidewall positioned parallel to the longitudinal axis of the exhaust conduit opposite the first sidewall, the second sidewall dividing the exhaust conduit into a third channel of the plurality of channels, the third channel parallel to the first channel and having a third cross-sectional area; andwherein the valve also includes a second valve positioned at a third channel inlet of the third channel, the second valve moveable between an open position and a closed position, andwherein the initial cross-sectional area of the exhaust conduit includes a sum of the first cross-sectional area of the first channel, the second cross-sectional area of the second channel and the third cross-sectional area of the third channel, and wherein reducing the initial cross-sectional area of the exhaust conduit includes closing the first valve and the second valve so that the initial cross-sectional area is reduced to include only the first cross-sectional area. 19. An apparatus for delivering an exhaust gas generated by an engine to an aftertreatment component, comprising: an exhaust conduit configured to be fluidly coupled to the engine and the aftertreatment component, a plurality of channels defined within the exhaust conduit, each of the plurality of channels structured to allow at least a portion of the exhaust gas to pass therethrough, an initial cross-sectional area of the exhaust conduit corresponding to a sum of the cross-sectional area of each of the plurality of channels, the exhaust conduit structured to receive the exhaust gas at an initial flow rate, the initial flow rate corresponding to an initial flow velocity of the exhaust gas entering the exhaust conduit, the initial flow rate, and thereby the initial flow velocity of the exhaust gas, increasing or decreasing based on an operating condition of the engine;a flow rate sensor positioned proximate to an inlet of the exhaust conduit;a valve positioned on an inlet of at least one of the plurality of channels; anda controller communicatively coupled to the flow rate sensor and the valve, the controller configured to: interpret an output signal from the flow rate sensor, the output signal indicative of the initial flow velocity of the exhaust gas, andif the initial flow rate is lower than the predetermined threshold, instruct the valve to move into a closed position to close an inlet of at least one of the plurality of channels, the closing of the valve causing the exhaust gas to flow through only a portion of the plurality of channels so that the exhaust conduit has a reduced cross-sectional area corresponding to a sum of the cross-sectional areas of the portion of the plurality of channels. 20. The apparatus of claim 19, wherein the plurality of channels are positioned in a radial array around a longitudinal axis of the exhaust conduit, and wherein the valve is positioned at an inlet of each of the plurality of channels. 21. The apparatus of claim 19, wherein the plurality of channels include: a first channel having a first cross-sectional area, anda second channel parallel to the first channel, the second channel having a second cross-sectional area, the second channel separated from the first channel via a first sidewall; andwherein the at valve is a first valve positioned at a second channel inlet of the second channel, and wherein the initial cross-sectional area of the exhaust conduit includes the first cross-sectional area of the first channel and the second cross-sectional area of the second channel, and wherein reducing the initial cross-sectional area of the exhaust conduit includes closing the first valve so that the initial cross-sectional area is reduced to include only the first cross-sectional area. 22. The apparatus of claim 21, wherein the controller is further configured to: if the initial flow rate of the exhaust gas becomes equal to or exceeds the predetermined threshold, instruct the first valve to move into an open position, the opening of the first valve allowing the exhaust gas to flow through each of the first channel and the second channel so that the exhaust gas has a second adjusted flow velocity in the first channel and the second channel equal to the initial flow velocity. 23. The apparatus of claim 21, wherein the controller is further configured to: if the initial flow rate of the exhaust gas becomes equal to or exceeds the predetermined threshold, instructing the first valve to move into an open position, the opening of the first valve allowing the exhaust gas to flow through each of the first channel and the second channel so that the exhaust gas has a second adjusted flow velocity in the first channel and the second channel different than the initial flow velocity. 24. The apparatus of claim 21, wherein the plurality of channels further include: a third channel positioned parallel to the first channel and defining a third cross-sectional area, the third channel separated from the first channel by a second sidewall; anda second valve positioned at a third channel inlet of the third channel,wherein the initial cross-sectional area of the exhaust conduit includes a sum of the first cross-sectional area of the first channel, the second cross-sectional area of the second channel and the third cross-sectional area of the third channel, and wherein reducing the initial cross-sectional area of the exhaust conduit includes closing the first valve and the second valve so that the initial cross-sectional area is reduced to include only the first cross-sectional area. 25. A control circuitry comprising a controller, the controller comprising: a flow rate sensing circuitry configured to interpret an output signal from a flow rate sensor, the flow rate sensor positioned proximate to an inlet of an exhaust conduit, the exhaust conduit comprising a plurality of channels having a plurality of respective cross-sectional areas, each of the plurality of channels defined within the exhaust conduit and structured to allow at least a portion of the exhaust gas to pass therethrough, the initial cross-sectional area of the exhaust conduit corresponding to a sum of the cross-sectional area of each of the plurality of channels, the output signal indicative of an initial flow rate of the exhaust gas, the initial flow rate corresponding to an initial flow velocity of the exhaust gas entering the exhaust conduit, anda cross-section adjusting circuitry configured to:communicate the exhaust gas into the exhaust conduit;determine, by interpreting an output signal from the flow rate sensor, the initial flow rate of the exhaust gas entering the exhaust conduit, wherein the initial flow rate, and thereby the initial flow velocity of the exhaust gas, increases or decreases based on an operating condition of the engine;compare the initial flow rate of the exhaust gas with a predetermined threshold; andif the initial flow rate of the exhaust gas is lower than the predetermined threshold, instruct the valve to move into a closed position to close an inlet of at least one of the plurality of channels, the moving the valve into the closed position causing the exhaust gas to flow through only a portion of the plurality of channels so that the exhaust conduit has a reduced cross-sectional area corresponding to a sum of the cross-sectional areas of the portion of the plurality of channels, causing the exhaust gas to have an adjusted flow velocity greater than the initial flow velocity;wherein the exhaust conduit is fluidly coupled to an engine to receive an exhaust gas therefrom.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (6)
Rogers, Kevin J.; Varner, Michael G.; Hoover, Kenneth F., Channelized SCR inlet for improved ammonia injection and efficient NOx control.
Zurbig Jurgen,DEX ; Tost Rainer,DEX ; Dolling Winfried,DEX ; Latsch Reinhard,DEX, Method and device for operating an internal combustion engine operating with an excess of air.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.