Systems and methods for controlling exhaust flow through an aftertreatment device
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IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F01N-003/00
B61C-005/04
F01N-003/031
F01N-003/021
출원번호
US-0236929
(2011-09-20)
등록번호
US-9238468
(2016-01-19)
발명자
/ 주소
Heverley, III, Lawrence Hoey
Kiran, Shashi
Geyer, Stephen Mark
출원인 / 주소
General Electric Company
대리인 / 주소
GE Global Patent Operation
인용정보
피인용 횟수 :
0인용 특허 :
12
초록▼
Various methods and systems are provided for a system for an engine. In one example, the system includes an exhaust passage through which exhaust gas is configured to flow from the engine. The system further includes an aftertreatment system disposed in the exhaust passage, the aftertreatment system
Various methods and systems are provided for a system for an engine. In one example, the system includes an exhaust passage through which exhaust gas is configured to flow from the engine. The system further includes an aftertreatment system disposed in the exhaust passage, the aftertreatment system including an aftertreatment device and a bypass with a bypass control element, the bypass control element adjustable to reduce exhaust gas flow through the aftertreatment device during tunneling operation.
대표청구항▼
1. A system for an engine, comprising: an exhaust passage through which exhaust gas is configured to flow from the engine;an EGR passage configured to selectively route at least a portion of the exhaust gas from the exhaust passage to an intake passage of the engine, the EGR passage including an EGR
1. A system for an engine, comprising: an exhaust passage through which exhaust gas is configured to flow from the engine;an EGR passage configured to selectively route at least a portion of the exhaust gas from the exhaust passage to an intake passage of the engine, the EGR passage including an EGR valve;an intake oxygen sensor configured to sense an intake oxygen concentration of a mixture of ambient air and, selectively, the portion of the exhaust gas flowing through the intake passage and into the engine;a control unit for controlling a position of the EGR valve to vary a flow of EGR through the EGR passage responsive to tunneling operation of the engine; andan aftertreatment system disposed in the exhaust passage, the aftertreatment system including an aftertreatment device and an aftertreatment bypass with a bypass control element, and the bypass control element is adjustable by the control unit to selectively control an amount of exhaust gas flow through the aftertreatment device or through the aftertreatment bypass and that is responsive to at least a change in the sensed intake oxygen concentration, and whereby the oxygen concentration in the mixture is controllable in response to the tunneling operation of the engine. 2. The system of claim 1, wherein the bypass control element is self-actuating, based on conditions of the exhaust gas, and wherein EGR is turned off during the tunneling operation. 3. The system of claim 1, wherein the aftertreatment device is a particulate filter, wherein the EGR passage routes exhaust from the exhaust passage upstream of a turbine of a turbocharger to the intake passage downstream of a compressor of the turbocharger, and wherein the control unit is configured to turn the EGR off and on. 4. The system of claim 1, wherein the control unit is configured to control the bypass control element to an open position during the tunneling operation. 5. The system of claim 4, wherein the control unit is further configured to identify a tunnel exit based on a temperature of the exhaust gas and a particulate load of the aftertreatment device, and to control the bypass control element to a closed position in response to identifying the tunnel exit. 6. The system of claim 4, wherein the control unit is further configured to adjust a degree to which the bypass control element is open based on an operating condition. 7. The system of claim 1, wherein the control unit is configured to adjust the bypass control element to reduce exhaust gas flow through the aftertreatment device responsive to an increased loading rate of the aftertreatment device when a temperature of the aftertreatment device is greater than a threshold temperature. 8. The system of claim 1, wherein the control unit is configured to adjust the bypass control element to reduce exhaust gas flow through the aftertreatment device responsive to an increased pressure in the exhaust passage upstream of the aftertreatment system. 9. A method for an aftertreatment system in a vehicle, comprising: via a controller of an engine of the vehicle: receiving a first signal from an oxygen sensor disposed in an intake passage of the engine upstream of a turbocharger and upstream of an EGR passage, the EGR passage including an EGR valve, where the oxygen sensor is configured to sense an oxygen concentration of ambient air drawn into the intake passage;in response to tunneling operation, adjusting the EGR valve to turn off EGR; andif the sensed oxygen concentration falls below a threshold value responsive to the tunneling operation, generating a second signal; andadjusting a bypass control element operatively coupled to a bypass of the aftertreatment system responsive to the generated second signal to route exhaust flow around an aftertreatment device of the aftertreatment system, the aftertreatment system disposed downstream of a turbine of the turbocharger in an exhaust passage of the engine. 10. The method of claim 9, further comprising generating the second signal based on one or more of a temperature of the aftertreatment device exceeding a threshold temperature and a loading rate of the aftertreatment device included in the aftertreatment system exceeding a threshold value. 11. The method of claim 9, further comprising generating the second signal based on a pressure in the exhaust passage upstream of the aftertreatment system exceeding a threshold pressure. 12. The method of claim 9, further comprising adjusting the bypass control element to increase exhaust flow through the aftertreatment device based on an exhaust gas temperature and a loading of the aftertreatment device when the sensed oxygen concentration of the ambient air drawn into the intake passage rises above the threshold. 13. The method of claim 9, further comprising adjusting the bypass control element in response to an indication of engine start-up. 14. The method of claim 9, further comprising adjusting the bypass control element in response to an indication of transient conditions. 15. A system for a vehicle, comprising: an exhaust passage through which exhaust gas is configured to flow from an engine of the vehicle;an aftertreatment system disposed in the exhaust passage, the aftertreatment system including at least a particulate filter and a bypass with a bypass control element;an intake oxygen sensor disposed in an intake passage of the engine upstream of a turbocharger; anda control unit configured to determine an oxygen concentration of ambient air drawn into the intake passage based on a signal received from the intake oxygen sensor of the engine of the vehicle upstream of a turbocharger and at least partially open the bypass control element to reduce exhaust gas flow through the particulate filter responsive to a reduced oxygen concentration of ambient air drawn into the intake passage of the engine upstream of the turbocharger. 16. The system of claim 15, further comprising at least partially opening the bypass control element to reduce exhaust gas flow through the particulate filter responsive to one or more of an increased pressure in the exhaust passage upstream of the aftertreatment system and an increased loading rate of the particulate filter when a temperature of the particulate filter is greater than a threshold temperature. 17. The system of claim 16, wherein the control unit is further configured to control a degree to which the bypass control element is open based on one or more of an extent to which an oxygen concentration in the exhaust passage is reduced, an extent to which the oxygen concentration of ambient air in the intake passage upstream of the turbocharger is reduced, an extent to which the pressure in the exhaust passage upstream of the aftertreatment system increases, or an extent to which the loading rate of the particulate filter increases when the temperature of the particulate filter is greater than the threshold temperature. 18. The system of claim 15, wherein the control unit is further configured to: identify tunneling operation based on the reduced oxygen concentration of ambient air drawn into the intake passage upstream of the turbocharger, and in response to identification of tunneling operation, at least partially open the bypass control element to reduce exhaust gas flow through the particulate filter; andidentify an exit of a tunnel through which the vehicle is traveling during the tunneling operation, and in response to the identification of the exit of the tunnel, to adjust the bypass control element to increase exhaust gas flow through the particulate filter based on an exhaust gas temperature and a loading of the particulate filter after the vehicle has exited the tunnel. 19. The system of claim 15, wherein a turbine of the turbocharger is positioned in the exhaust passage, wherein the aftertreatment system is disposed downstream of the turbine, wherein an EGR passage routes exhaust from the exhaust passage upstream of the turbine to the intake passage downstream of a compressor of the turbocharger, the EGR passage including an EGR valve, and wherein the control unit is further configured to control the EGR valve to turn EGR off and to reduce exhaust gas flow through the particulate filter responsive to the reduced oxygen concentration of ambient air drawn into the intake passage of the engine upstream of the turbocharger when EGR is turned off. 20. A system for a vehicle comprising: a control unit configured to receive data;an aftertreatment device of an aftertreatment system associated with an engine of the vehicle, the aftertreatment device arranged in an exhaust passage of the engine;a bypass coupling the exhaust passage upstream of the aftertreatment device with the exhaust passage downstream of the aftertreatment device; anda turbocharger with a turbine positioned in the exhaust passage, the aftertreatment device disposed downstream of the turbine, and a compressor positioned in an intake passage of the engine;an EGR passage routing exhaust from the exhaust passage upstream of the turbine to the intake passage downstream of the compressor, the EGR passage including an EGR valve controllable by the control unit to turn EGR on and off;an intake oxygen sensor positioned in the intake passage upstream of the compressor and configured to sense an oxygen concentration of ambient air drawn into the intake passage upstream of the compressor;wherein the control unit is further configured to: adjust the EGR valve to turn EGR off in response to tunneling operation; andgenerate a signal, responsive to the received data, for controlling a bypass control element to route exhaust gas through the bypass and around the aftertreatment device responsive to the tunneling operation, wherein the received data includes the oxygen concentration of ambient air drawn into the intake passage upstream of the compressor. 21. The system of claim 20, wherein the bypass control element is operatively coupled to the bypass or to the exhaust passage and wherein the bypass control element, when operatively coupled to the bypass or the exhaust passage, is controllable by the control unit to vary a flow of the exhaust gas through the bypass and around the aftertreatment device. 22. The system of claim 20, wherein the control unit is configured to determine passage of the vehicle through a tunnel, based on the received data, and wherein the control unit is configured to generate the signal responsive to determining the passage of the vehicle through the tunnel. 23. The system of claim 20, wherein the received data further includes an oxygen concentration in the exhaust passage, and wherein the control unit is configured to determine entry of the vehicle into a tunnel when the oxygen concentration of ambient air drawn into in the intake passage upstream of the compressor or the oxygen concentration in the exhaust passage falls below a threshold. 24. The system of claim 23, wherein the control unit is further configured to determine exiting of the vehicle from the tunnel when the oxygen concentration of ambient air drawn into the intake passage upstream of the compressor or the oxygen concentration in the exhaust passage rises above the threshold, and to reduce a flow of the exhaust gas through the bypass upon exiting of the vehicle from the tunnel.
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이 특허에 인용된 특허 (12)
Cooper Charles E. (Erie PA) Vest Glenn E. (Erie PA), Automatic tunnel detector for a self-propelled traction vehicle.
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