Exhaust system with exhaust gas recirculation and multiple turbochargers, and method for operating same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02B-033/44
F02D-023/00
F01N-001/00
F02M-025/07
F02B-033/00
F02B-037/18
F02B-037/013
F02B-037/02
F02B-027/04
F02D-041/10
F02D-041/00
출원번호
US-0554659
(2014-11-26)
등록번호
US-9546591
(2017-01-17)
발명자
/ 주소
Ge, Xinyu
Liang, Hong Liang
출원인 / 주소
Caterpillar Inc.
대리인 / 주소
Hibshman Claim Contruction PLLC
인용정보
피인용 횟수 :
1인용 특허 :
11
초록▼
An exhaust system includes a first turbine having an inlet that is fluidly coupled to an exhaust conduit; a valve assembly having an inlet port, a first outlet port, and a second outlet port, the inlet port of the valve assembly being in fluid communication with the exhaust conduit; a second turbine
An exhaust system includes a first turbine having an inlet that is fluidly coupled to an exhaust conduit; a valve assembly having an inlet port, a first outlet port, and a second outlet port, the inlet port of the valve assembly being in fluid communication with the exhaust conduit; a second turbine having an inlet that is fluidly coupled to the first outlet port of the valve assembly via a first outlet port conduit, and fluidly coupled to an outlet of the first turbine via a first turbine outlet conduit; and a controller operatively coupled to the valve assembly. The valve assembly has a first configuration that blocks fluid communication between the inlet port and the first outlet port, and the valve assembly has a second configuration that effects fluid communication between the inlet port and the first outlet port.
대표청구항▼
1. An exhaust system, comprising: an exhaust conduit configured to receive a flow of exhaust gas from an internal combustion engine;a valve assembly disposed in an exhaust bypass conduit and having an inlet port, a first outlet port, and a second outlet port, the inlet port of the valve assembly bei
1. An exhaust system, comprising: an exhaust conduit configured to receive a flow of exhaust gas from an internal combustion engine;a valve assembly disposed in an exhaust bypass conduit and having an inlet port, a first outlet port, and a second outlet port, the inlet port of the valve assembly being in fluid communication with the exhaust conduit via the exhaust bypass conduit; wherein the valve assembly has a first configuration that blocks fluid communication between the inlet port and the first outlet port; andwherein the valve assembly has a second configuration that effects fluid communication between the inlet port and the first outlet port;a first turbine having an inlet that is fluidly coupled to the exhaust conduit via a first turbine inlet conduit, the first turbine inlet conduit extending from the exhaust conduit to the inlet of the first turbine;a first compressor operatively coupled to the first turbine via a first shaft;a second turbine having an inlet that is fluidly coupled to the first outlet port of the valve assembly via a first outlet port conduit, and fluidly coupled to an outlet of the first turbine via a first turbine outlet conduit, the first turbine outlet conduit being distinct from the first outlet port conduit; anda controller operatively coupled to the valve assembly, the controller being configured to effect simultaneous fluid communication between the inlet of the second turbine and the outlet of the first turbine via the first turbine outlet conduit, and between the inlet of the second turbine and the first outlet port of the valve assembly via the first outlet port conduit, by actuating the valve assembly to the second configuration. 2. The exhaust system of claim 1, further comprising: a second compressor operatively coupled to the second turbine, an outlet of the second compressor being fluidly coupled to an inlet of the first compressor via a first compressor inlet conduit; andan exhaust gas recirculation (EGR) conduit effecting fluid communication between the second outlet port of the valve assembly and the first compressor inlet conduit. 3. The exhaust system of claim 2, wherein the first configuration of the valve assembly blocks fluid communication between the inlet port of the valve assembly and the second outlet port of the valve assembly. 4. The exhaust system of claim 3, wherein the second configuration of the valve assembly blocks fluid communication between the inlet port of the valve assembly and the second outlet port of the valve assembly. 5. The exhaust system of claim 3, wherein the second configuration of the valve assembly effects fluid communication between the inlet port of the valve assembly and the second outlet port of the valve assembly. 6. The exhaust system of claim 2, wherein the valve assembly has a third configuration that effects fluid communication between the inlet port and the first outlet port;wherein the second configuration of the valve assembly effects a first flow resistance between the inlet port and the first outlet port of the valve assembly;wherein the third configuration of the valve assembly effects a second flow resistance between the inlet port and the first outlet port of the valve assembly; andwherein the first flow resistance is different from the second flow resistance. 7. The exhaust system of claim 6, wherein the controller is further configured to adjust a flow split between an exhaust gas flow through the first turbine and an exhaust gas flow through the second turbine by actuating the valve assembly between the second configuration and the third configuration, the exhaust gas flow through the first turbine and the exhaust gas flow through the second turbine each being greater than zero. 8. The exhaust system of claim 2, wherein the valve assembly includes a bypass valve and an EGR valve;wherein the inlet port of the valve assembly is an inlet port of the bypass valve;wherein an outlet port of the bypass valve is fluidly coupled to an inlet of the EGR valve via an EGR valve conduit; andwherein the bypass valve is operable between a first configuration that blocks fluid communication between the inlet port of the bypass valve and the EGR valve conduit, and a second configuration that effects fluid communication between the inlet port of the bypass valve and the EGR valve conduit. 9. The exhaust system of claim 1, wherein the controller is further configured to block fluid communication between the exhaust conduit and the inlet to the second turbine via the valve assembly by actuating the valve assembly to the first configuration. 10. An internal combustion engine, comprising: a plurality of engine cylinders, each engine cylinder of the plurality of engine cylinders including a piston configured to reciprocate therein;an intake manifold fluidly coupled to the plurality of engine cylinders via a plurality of intake valves;an exhaust manifold fluidly coupled to the plurality of engine cylinders via a plurality of exhaust valves;a valve assembly disposed in an exhaust bypass conduit and having an inlet port, a first outlet port, and a second outlet port, the inlet port of the valve assembly being in fluid communication with the exhaust manifold via the exhaust bypass conduit; wherein the valve assembly has a first configuration that blocks fluid communication between the inlet port and the first outlet port; andwherein the valve assembly has a second configuration that effects fluid communication between the inlet port and the first outlet port;a first turbine having an inlet that is fluidly coupled to the exhaust manifold via a first turbine inlet conduit, the first turbine inlet conduit extending from the exhaust manifold to the inlet of the first turbine;a first compressor operatively coupled to the first turbine, an outlet of the first compressor being fluidly coupled to the intake manifold;a second turbine having an inlet that is fluidly coupled to the first outlet port of the valve assembly via a first outlet port conduit, and fluidly coupled to an outlet of the first turbine via a first turbine outlet conduit, the first turbine outlet conduit being distinct from the first outlet port conduit; anda controller operatively coupled to the valve assembly, the controller being configured to effect simultaneous fluid communication between the inlet of the second turbine and the outlet of the first turbine via the first turbine outlet conduit, and between the inlet of the second turbine and the first outlet port of the valve assembly via the first outlet port conduit, by actuating the valve assembly to the second configuration. 11. The internal combustion engine of claim 10, wherein the exhaust manifold includes an exhaust pulse converter. 12. The internal combustion engine of claim 11, wherein the inlet port of the valve assembly is fluidly coupled to a diffuser of the exhaust pulse converter; andwherein an outlet of the diffuser of the exhaust pulse converter is fluidly coupled to the inlet of the first turbine. 13. The internal combustion engine of claim 11, wherein the exhaust pulse converter includes a first ejector conduit and a second ejector conduit;wherein the plurality of engine cylinders includes a first engine cylinder, a second engine cylinder, a third engine cylinder, a fourth engine cylinder, a fifth engine cylinder, and a sixth engine cylinder;wherein the first engine cylinder, the second engine cylinder, and the third engine cylinder are fluidly combined and coupled to the first ejector conduit via a first ejector manifold; andwherein the fourth engine cylinder, the fifth engine cylinder, and the sixth engine cylinder are fluidly combined and coupled to the second ejector conduit via a second ejector manifold. 14. The internal combustion engine of claim 13, wherein the exhaust pulse converter further includes a mixing section disposed downstream of the first ejector conduit and the second ejector conduit, the mixing section being fluidly coupled to both the first ejector conduit and the second ejector conduit;wherein the plurality of engine cylinders further includes a seventh engine cylinder and a eighth engine cylinder;wherein the seventh engine cylinder is fluidly coupled to the mixing section via a first mixing ejector; andwherein the eighth engine cylinder is fluidly coupled to the mixing section via a second mixing ejector. 15. A method for operating an internal combustion engine, the internal combustion engine including an exhaust conduit fluidly coupled to the internal combustion engine, and a valve assembly disposed in an exhaust bypass conduit and having an inlet port, a first outlet port, and a second outlet port, the inlet port of the valve assembly being in fluid communication with the exhaust conduit via the exhaust bypass conduit, wherein the valve assembly has a first configuration that blocks fluid communication between the inlet port and the first outlet port, and a second configuration that effects fluid communication between the inlet port and the first outlet port, the method comprising: generating a flow of exhaust gas via the internal combustion engine;receiving the flow of exhaust gas in the exhaust conduit;selectively splitting the flow of exhaust gas into a first exhaust gas flow and a second exhaust gas flow;directing the first exhaust gas flow through a first turbine via a first turbine inlet conduit;directing the second exhaust gas flow to the inlet port of the valve assembly via the exhaust bypass conduit;delivering at least a portion of the second exhaust gas flow to the first outlet port of the valve assembly;combining the first exhaust gas flow and the at least a portion of the second exhaust gas flow into a third exhaust gas flow downstream of the first turbine; anddirecting the third exhaust gas flow through a second turbine. 16. The method of claim 15, further comprising: selectively splitting the second exhaust flow into a fourth exhaust flow and a fifth exhaust flow via the valve assembly;directing the fourth exhaust flow through the second turbine via the first outlet port of the valve assembly; anddirecting the fifth exhaust flow to an inlet of a first compressor via the second outlet port of the valve assembly, the first compressor being operatively coupled to the first turbine via a first shaft. 17. The method of claim 15, further comprising: determining, via a controller, whether one of a load and a speed of the internal combustion engine is increasing; andincreasing a proportion of the second exhaust gas flow relative to the first exhaust gas flow via the valve assembly based on whether the load or the speed of the internal combustion engine is increasing. 18. The method of claim 15, further comprising: determining, via a controller, a gradient in turbine efficiency as a function of one or more turbine operating parameters; andadjusting a relative proportion of the second exhaust gas flow to the first exhaust gas flow via the valve assembly based on the gradient in turbine efficiency. 19. The method of claim 15, further comprising: comparing, via a controller, a current speed and load of the internal combustion engine to a reference speed and load of the internal combustion engine;wherein the selectively splitting the flow of exhaust gas into a first exhaust gas flow and a second exhaust gas flow is based on the comparing the current speed and load of the internal combustion engine to the reference speed and load of the internal combustion engine. 20. The method of claim 19, further comprising selectively delivering all of the flow of exhaust gas through the first turbine via control of the valve assembly and based on the comparing the current speed and load of the internal combustion engine to the reference speed and load of the internal combustion engine.
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이 특허에 인용된 특허 (11)
Roth, David B., Controlling exhaust gas flow divided between turbocharging and exhaust gas recirculating.
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