[특허]Supercharged internal combustion engine with exhaust-gas turbochargers arranged in series and method for operating an internal combustion engine of said type

Ford Global Technologies, LLC

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특허 상세정보

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Supercharged internal combustion engine with exhaust-gas turbochargers arranged in series and method for operating an internal combustion engine of said type

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F02D-023/00 F02M-025/07 F01D-017/08 F01D-017/10 F02B-037/013 F02B-037/18 F02B-037/02 F02B-037/00
출원번호	US-0469511 (2014-08-26)
등록번호	US-9394855 (2016-07-19)
우선권정보	DE-10 2013 218 815 (2013-09-19)
발명자 / 주소	Kemmerling, Joerg Sommerhoff, Franz Arnd Smiljanovski, Vanco Kindl, Helmut Matthias Kuske, Andreas
출원인 / 주소	Ford Global Technologies, LLC
대리인 / 주소	Voutyras, Julia
인용정보	피인용 횟수 : 0 인용 특허 : 6

초록

A supercharged internal combustion engine, comprising a high-pressure turbine connected to a channel of a low-pressure turbine and a bypass line, branching from upstream the high-pressure turbine, connectable to the channels of the low-pressure turbine via a control element positioned within the bypass line, is provided. Adjusting the control element fluidly connects each of the channels of the low-pressure turbine to the bypass line responsive to the exhaust-gas flow rate to optimize the performance of the engine.

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1. A supercharged internal combustion engine, comprising: an intake system for the supply of charge air;an exhaust-gas discharge system for the discharge of exhaust gas;at least two series-connected exhaust-gas turbochargers which each comprise a turbine, arranged in the exhaust-gas discharge system, and a compressor, arranged in the intake system, and of which a first exhaust-gas turbocharger serves as a low-pressure stage and a second exhaust-gas turbocharger serves as a high-pressure stage;a second turbine of the second exhaust-gas turbocharger being arranged upstream of a first turbine of the first exhaust-gas turbocharger, and a second compressor of the second exhaust-gas turbocharger being arranged downstream of a first compressor of the first exhaust-gas turbocharger;a first bypass line provided which branches off from the exhaust-gas discharge system upstream of the second turbine and which issues into the exhaust-gas discharge system upstream of the first turbine;a control element provided for metering an exhaust-gas flow rate that is conducted via the first bypass line;an exhaust-gas recirculation arrangement being provided;wherein the first turbine is a two-channel turbine which comprises at least one rotor mounted on a rotatable shaft in a turbine housing, and wherein the first turbine comprises an inner first channel and an outer second channel, wherein the inner first channel has a smaller radius around a rotational axis of the rotor and a smaller volume than the outer second channel;the second turbine is connected via an exhaust line to the first channel of the two-channel turbine; andthe first bypass line is connectable to both channels of the two-channel turbine, the control element blocking the first bypass line when in a rest position when exhaust gas flow is below a lower first threshold, connecting the first bypass line to the first channel of the two-channel turbine when in a first working position when exhaust gas flow is between the lower first threshold and a higher second threshold, and connecting the first bypass line to both channels of the two-channel turbine when in a second working position when exhaust gas flow is greater than the higher second threshold. 2. The supercharged internal combustion engine as claimed in claim 1, wherein the control element is a pivotable flap. 3. The supercharged internal combustion engine as claimed in claim 1, wherein the control element is continuously adjustable. 4. The supercharged internal combustion engine as claimed in claim 1, wherein the control element is continuously adjustable at least between the rest position and the first working position. 5. The supercharged internal combustion engine as claimed in claim 1, wherein the first compressor is designed to be larger than the second compressor. 6. The supercharged internal combustion engine as claimed in claim 1, wherein the first turbine is designed to be larger than the second turbine. 7. The supercharged internal combustion engine as claimed claim 1, wherein the two-channel turbine is a dual-flow turbine in which the two channels are arranged one on top of the other as viewed in a section perpendicular to the rotational axis of the at least one rotor and, at least along an arc-shaped segment, enclose the at least one rotor in spiral form at different radii. 8. The supercharged internal combustion engine as claimed in claim 1, wherein the two-channel turbine is a twin-flow turbine in which the two channels are arranged adjacent to one another and, at least along an arc-shaped segment, enclose the at least one rotor in spiral form at equal radii. 9. The supercharged internal combustion engine as claimed in claim 1, wherein the two channels are separated from one another as far as the at least one rotor by means of a housing wall, wherein the housing wall has, at the rotor side, a free tongue-like end and ends with a spacing to the at least one rotor, such that a tongue spacing is formed. 10. The supercharged internal combustion engine as claimed in claim 1, wherein a second bypass line is provided which branches off from the exhaust-gas discharge system upstream of the first turbine and opens downstream of the first turbine. 11. The supercharged internal combustion engine as claimed in claim 1, having at least two cylinders, wherein each cylinder has at least one outlet opening for the discharge of the exhaust gases from the cylinder, and each outlet opening is adjoined by an exhaust line, wherein the exhaust lines of the at least two cylinders merge within the cylinder head to form an integrated exhaust manifold. 12. The supercharged internal combustion engine as claimed in claim 1, wherein a control valve is provided by which the second turbine can be deactivated. 13. A method, comprising: controlling a turbocharged engine having a second turbine positioned upstream of a first two-channel turbine, the second turbine fluidly connected to only a first channel of the first turbine, and a bypass line which branches upstream of the second turbine and is fluidly connectable to both channels via a valve, including: closing the valve when an exhaust gas flow rate is less than a lower first threshold;adjusting the valve between a rest position and a first position to fluidly connect the bypass line to the first channel of the first turbine responsive to the exhaust gas flow rate a increasing above the lower first threshold and remaining below a higher second threshold; andadjusting the valve between the first position and a fully open second position to fluidly connect the bypass line to the first channel and a second channel of the first turbine responsive to the exhaust gas flow rate increasing above the higher second threshold. 14. The method as claimed in claim 13, wherein the valve is continuously adjustable between the rest position and the first position. 15. The method as claimed in claim 13, further comprising adjusting the valve to the first position when the exhaust gas flow rate is above the first threshold for a time period. 16. The method as claimed in claim 13, wherein the valve is adjusted to the second position to fluidly connect the first channel and the second channel to the bypass line when the exhaust gas flow rate is above the second threshold, the method further comprising adjusting the valve to the second position when the exhaust gas flow rate is above the second threshold for a time period. 17. A method, comprising: during a first mode, directing exhaust through a first turbine and then through only a first channel of a second turbine;during a second mode, directing exhaust through the first turbine and then through the first channel of the second turbine while directing exhaust in parallel through a bypass channel coupled to upstream of the first turbine, to only the first channel of the second turbine; andduring a third mode, directing exhaust through the bypass channel to both the first channel and a second channel of the second turbine. 18. The method of claim 17 further comprising during a fourth mode, directing exhaust through only the bypass channel to both the first and second channels of the second turbine and not through the first turbine. 19. The method of claim 18 wherein during the first mode no exhaust flows through the bypass channel and the second channel of the second turbine, and wherein during the second mode exhaust flows through the bypass channel but no exhaust flows through the second channel of the second turbine, and wherein during the third and fourth modes exhaust flows through the bypass channel to both the first and second channels of the second turbine, wherein the first turbine has only a single channel, wherein the first, second, third, and fourth modes are carried out mutually exclusively and operation transitions between the modes by adjusting a valve upstream of the second turbine in a passage in parallel with the first turbine.

이 특허에 인용된 특허 (6)

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Supercharged internal combustion engine with exhaust-gas turbochargers arranged in series and method for operating an internal combustion engine of said type

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Supercharged internal combustion engine with exhaust-gas turbochargers arranged in series and method for operating an internal combustion engine of said type

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이 특허에 인용된 특허 (6)

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