A turbocharger system comprises a first relatively small high-pressure (HP) turbocharger (1) and a second relatively large low pressure (LP) turbocharger (2). The turbine (6) of the LP turbocharger (2) is connected in series downstream of the turbine (4) of the HP turbocharger (1) in a first exhaust
A turbocharger system comprises a first relatively small high-pressure (HP) turbocharger (1) and a second relatively large low pressure (LP) turbocharger (2). The turbine (6) of the LP turbocharger (2) is connected in series downstream of the turbine (4) of the HP turbocharger (1) in a first exhaust gas passage (11). An exhaust bypass flow passage (12) provides a bypass flow path around the HP turbine (4). A rotary valve (8) is located at a junction of the bypass flow passage (12) and a first exhaust gas flow passage (11). The rotary valve (8) comprises a valve rotor (19) which is rotatable to selectively permit or block flow to the LP turbine (6) from either the first exhaust gas passage (11) or the bypass gas passage (12).
대표청구항▼
1. A turbocharger, comprising a turbine wheel mounted for rotation within a turbine chamber defined by a turbine housing, the housing defining a first inlet passage, a second inlet passage, and a third passage communicating with said turbine chamber, the first, second and third passages meeting at a
1. A turbocharger, comprising a turbine wheel mounted for rotation within a turbine chamber defined by a turbine housing, the housing defining a first inlet passage, a second inlet passage, and a third passage communicating with said turbine chamber, the first, second and third passages meeting at a junction, wherein a rotary valve is located at said junction, the rotary valve comprising a valve rotor which is rotatable about a valve axis to selectively permit or block exhaust gas flow to the third inlet passage from either the first inlet passage and/or second inlet passage; wherein the valve rotor rotates within a valve chamber defined by the housing, the valve chamber having a first inlet port communicating with the first inlet passage, a second inlet port communicating with the second inlet passage, and an outlet port communicating with the third inlet passage. 2. The turbocharger according to claim 1, wherein the valve rotor is structured to provide rotation about said axis into a position in which each of the three ports is at least substantially unobstructed. 3. The turbocharger according to claim 1, wherein the valve rotor is structured to provide rotation about said axis into at least one position in which the first inlet port and the outlet port are unobstructed, and the second inlet port is at either partially or fully obstructed. 4. The turbocharger according to claim 1, wherein the valve rotor is structured to provide rotation about said axis into at least one position in which the first inlet port is unobstructed, the second inlet port is fully obstructed and the outlet port is either partially or fully obstructed. 5. The turbocharger according to claim 1, wherein the valve rotor is structured to provide rotation into at least one position in which the second inlet port is unobstructed, the first inlet port is fully obstructed, and the outlet port is partially or fully obstructed. 6. The turbocharger according to claim 1, wherein the valve rotor is structured to provide rotation into a position in which the outlet port is fully obstructed. 7. The turbocharger according to claim 1, further comprising a pressure release valve for controlling or limiting pressure within the second inlet passage and/or the valve chamber. 8. A turbocharged internal combustion engine including a turbocharger system comprising: a first relatively small turbocharger;a second relatively large turbocharger;the first turbocharger comprising a first exhaust turbine situated in a first exhaust passage;the second turbocharger including a second exhaust turbine situated in said first exhaust passage downstream of said first turbine;an exhaust bypass flow passage communicating with the first exhaust flow passage upstream and downstream of the first turbine;and a rotary valve located at a junction of the bypass flow passage and the first exhaust gas flow passage, the rotary valve comprising a valve rotor which is rotatable about a valve axis to selectively permit or block flow to the second turbine inlet from the first exhaust gas passage and/or bypass gas passage;wherein the valve rotor rotates within a valve chamber which has a first port communicating with the first exhaust gas passage, a second port communicating with the bypass exhaust gas passage, and a third port communicating with the second turbine. 9. A turbocharger system comprising: a first relatively small turbocharger;a second relatively large turbocharger;the first turbocharger comprising a first exhaust turbine situated in a first exhaust passage;the second turbocharger including a second exhaust turbine situated in said first exhaust passage downstream of said first turbine;an exhaust bypass flow passage communicating with the first exhaust flow passage upstream and downstream of the first turbine;and a rotary valve located at a junction of the bypass flow passage and the first exhaust gas flow passage, the rotary valve comprising a valve rotor which is rotatable about a valve axis to selectively permit or block flow to the second turbine inlet from the first exhaust gas passage and/or bypass gas passage;wherein the valve rotor rotates within a valve chamber which has a first port communicating with the first exhaust gas passage, a second port communicating with the bypass exhaust gas passage, and a third port communicating with the second turbine;wherein the first and second turbines have a common turbine housing, the rotary valve being housed within said common turbine housing either upstream or downstream of the first turbine inlet. 10. A turbocharger system comprising: a first relatively small turbocharger;a second relatively large turbocharger;the first turbocharger comprising a first exhaust turbine situated in a first exhaust passage;the second turbocharger including a second exhaust turbine situated in said first exhaust passage downstream of said first turbine;an exhaust bypass flow passage communicating with the first exhaust flow passage upstream and downstream of the first turbine;and a rotary valve located at a junction of the bypass flow passage and the first exhaust gas flow passage, the rotary valve comprising a valve rotor which is rotatable about a valve axis to selectively permit or block flow to the second turbine inlet from the first exhaust gas passage and/or bypass gas passage;wherein the valve rotor rotates within a valve chamber which has a first port communicating with the first exhaust gas passage, a second port communicating with the bypass exhaust gas passage, and a third port communicating with the second turbine; andfurther including at least one sensor from the following group: a sensor for detecting or determining the speed of rotation of the first turbine and/or the second turbine,a sensor for detecting or determining the boost pressure generated by the first and/or second turbocharger;a sensor for detecting or determining the back pressure in the exhaust gas bypass path;a sensor for detecting or determining pressure within the rotary valve chamber;a sensor for detecting or determining the rotational speed of an engine to which the turbocharger system is operably connected; anda sensor for detecting or determining load on an engine to which the turbocharger system is operably connected. 11. The turbocharger system according to claim 10, wherein the valve rotor is rotatable about said axis into a position in which each of the three ports is at least substantially unobstructed. 12. The turbocharger system according to claim 10, wherein the valve rotor is structured to provide rotation about said axis into one of a plurality of positions in which the first port and third port are unobstructed and the second port is at least a partially obstructed. 13. The turbocharger system according to claim 10, wherein the valve rotor is structured to provide rotation into a position in which the second port is fully obstructed. 14. The turbocharger system according to claim 10, wherein the valve rotor is structured to provide rotation about said axis into a position in which the second port is at least substantially obstructed and either the third port or the first port is at least partially obstructed. 15. The turbocharger system according to claim 14, wherein the valve rotor is structured to provide rotation about said axis into one of a plurality of positions in which the second port is at least partially obstructed and either the third port or the first port is at least partially obstructed. 16. The turbocharger according to claim 14, wherein the second port is fully obstructed. 17. The turbocharger according to claim 14, wherein the first port is unobstructed and the third port is at least partially obstructed. 18. The turbocharger system according to claim 10, wherein the valve rotor is structured to provide rotation into a position in which the first port is at least substantially obstructed and either the third port or the second port is at least partially obstructed. 19. The turbocharger system according to claim 18, wherein the valve rotor is structured to provide rotation about said axis into one of a plurality of positions in which the first port is at least substantially obstructed and either the third port or the second port is at least partially obstructed. 20. The turbocharger system according to claim 18, wherein the first port is fully obstructed. 21. The turbocharger according to claim 18, wherein the second port is unobstructed and the third port is at least partially obstructed. 22. The turbocharger system according to claim 21, wherein the valve rotor is structured to provide rotation into a position in which the third port is fully obstructed. 23. The turbocharger system according to claim 10, wherein the junction is downstream of said first turbine. 24. The turbocharger system according to claim 10, wherein the junction is downstream of the first turbine, the first port is an inlet port communicating with the first turbine, the second port is an inlet port communicating with the bypass exhaust gas passage, and the third port is an outlet port communicating with the second turbine. 25. The turbocharger system according to claim 10, wherein the rotary valve is housed within a housing which is separate to or integral with either one of the first and second turbine housings. 26. The turbocharger system according to claim 10, wherein the first and second turbines have a common turbine housing, the rotary valve being housed within said common turbine housing either upstream or downstream of the first turbine inlet. 27. The turbocharger system according to claim 10, wherein the valve rotor comprises an arcuate surface which at least partially covers the first and/or second, and/or third port when the valve rotor is in a position in which the respective port is at least partially obstructed. 28. The turbocharger system according to claim 27, wherein said arcuate surface defines a sector of a cylinder. 29. The turbocharger system according to claim 10, wherein the valve rotor is rotatably supported at first and second ends thereof for rotation about said axis. 30. The turbocharger system according to claim 10, comprising an electric, pneumatic, or hydraulic actuator for effecting rotation of the valve rotor. 31. The turbocharger system according to claim 10, wherein the rotary valve is adapted to receive control signals from a controller.
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이 특허에 인용된 특허 (9)
Hertweck, Gernot; Hirth, Torsten; Krätschmer, Stephan; Löffler, Paul; Sumser, Siegfried, Exhaust-gas turbocharger for an internal combustion engine.
Stanek, Joe F.; Lockwood, John A.; Hashemi, Sam; Franks, Donald Charles, Method and system for improving stopping and starting of a turbocharged engine.
Stanek, Joe F.; Lockwood, John A.; Hashemi, Sam; Franks, Donald Charles, Method and system for improving stopping and starting of a turbocharged engine.
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