Control apparatus for internal combustion engine equipped with supercharger
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02D-023/02
F02D-023/00
F02B-037/007
F02B-037/013
F02B-037/12
F02B-037/18
F02D-041/00
F02B-037/00
F02D-041/18
출원번호
US-0390277
(2009-10-26)
등록번호
US-9038384
(2015-05-26)
국제출원번호
PCT/JP2009/068731
(2009-10-26)
§371/§102 date
20120213
(20120213)
국제공개번호
WO2011/052086
(2011-05-05)
발명자
/ 주소
Tomita, Tetsuji
Ibuki, Taku
Hirosawa, Yoshihisa
출원인 / 주소
TOYOTA JIDOSHA KABUSHIKI KAISHA
대리인 / 주소
Oliff PLC
인용정보
피인용 횟수 :
0인용 특허 :
4
초록▼
A first supercharger and a second supercharger are disposed in series in intake and exhaust passages. In a B region in which both the supercharging effects of the first and second superchargers are utilized, the opening of an exhaust control valve disposed in a passage for bypassing the turbine of t
A first supercharger and a second supercharger are disposed in series in intake and exhaust passages. In a B region in which both the supercharging effects of the first and second superchargers are utilized, the opening of an exhaust control valve disposed in a passage for bypassing the turbine of the first supercharger is set to an intermediate degree, and the opening of an intake control valve disposed in a passage for bypassing the compressor of the first supercharger is set to the minimum. In a C region in which the supercharging effect of only the second supercharger is utilized, both the openings of the exhaust control valve and the intake control valve are set to the maximum. When the control region shifts from B region to C region as result of acceleration of the vehicle, the fuel injection amount is reduced over a predetermined period immediately after the shift.
대표청구항▼
1. An apparatus for a supercharger-equipped internal combustion engine having an exhaust passage, the apparatus comprising: a first turbo charger including: a first turbine disposed in the exhaust passage of the engine and driven by energy of an exhaust gas discharged from the engine, and a first co
1. An apparatus for a supercharger-equipped internal combustion engine having an exhaust passage, the apparatus comprising: a first turbo charger including: a first turbine disposed in the exhaust passage of the engine and driven by energy of an exhaust gas discharged from the engine, and a first compressor disposed in an intake passage of the engine and driven by the first turbine;a second turbo charger including: a second turbine disposed in the exhaust passage at a position downstream of the first turbine, the second turbine being driven by energy of the exhaust gas discharged from the engine and being greater in size than the first turbine, and a second compressor disposed in the intake passage at a position upstream of the first compressor, the second compressor being driven by the second turbine and being greater in size than the first compressor;a first exhaust bypass passage forming a bypass between a portion of the exhaust passage located upstream of the first turbine and a portion of the exhaust passage located between the first and second turbines;a first intake bypass passage forming a bypass between a portion of the intake passage located between the first and second compressors and a portion of the intake passage located downstream of the first compressor;a first exhaust control valve disposed in the first exhaust bypass passage and adapted to adjust a first exhaust bypass area, which is the minimum opening sectional area of the first exhaust bypass passage;a first intake control valve disposed in the first intake bypass passage and adapted to adjust a first intake bypass area, which is the minimum opening sectional area of the first intake bypass passage;an electronic control unit programmed to:acquire a supercharging pressure ratio, which is the ratio of the pressure in the intake passage at a position downstream of the first compressor to the pressure in the intake passage at a position upstream of the second compressor;acquire the flow rate of air passing through the intake passage;determine whether a combination of the supercharging pressure ratio and the air flow rate falls within a two turbos use region in which supercharging effects of both the first and second turbo chargers are utilized, or a second turbo use region which is adjacently located on one side of the two turbos use region where the air flow rate assumes a larger value as compared with the other side thereof and in which a supercharging effect of only the second turbo charger is utilized;control the first exhaust control valve and the first intake control valve such that the first exhaust bypass area assumes an intermediate value between its minimum and maximum values, and the first intake bypass area assumes its minimum value, when the combination of the supercharging pressure ratio and the air flow rate is determined to fall within the two turbos use region, and for controlling the first exhaust control valve and the first intake control valve such that the first exhaust bypass area assumes its maximum value and the first intake bypass area assumes its maximum value, when the combination of the supercharging pressure ratio and the air flow rate is determined to fall within the second turbo use region; andinject fuel amount determined based on an operation state of the internal combustion engine, wherein:the electronic control unit performs, over a predetermined period, amount reducing control for reducing the injection amount of the fuel, when the combination of the supercharging pressure ratio and the air flow rate shifts from the two turbos use region to the second turbo use region, andthe electronic control unit is configured such that: (i) when the amount reducing control is not performed, the electronic control unit injects fuel in a base fuel injection amount determined based on a pressure (Pim) in an intake manifold and a rotational speed (NE) of the internal combustion engine, and (ii) when the amount reducing control is performed, the electronic control unit injects fuel in an amount smaller than the base fuel injection amount. 2. An apparatus for a supercharger-equipped internal combustion engine according to claim 1, wherein the electronic control unit is configured to determine an amount by which the injection amount of the fuel is reduced in the amount reducing control, on the basis of an operation speed of the internal combustion engine and the injection amount of the fuel. 3. An apparatus for a supercharger-equipped internal combustion engine according to claim 1, wherein the electronic control unit is configured such that, when the combination of the supercharging pressure ratio and the air flow rate shifts from the two turbos use region to the second turbo use region, the electronic control unit determines whether or not the amount reducing control is to be performed, on the basis of an operation speed of the internal combustion engine and the injection amount of the fuel. 4. An apparatus for a supercharger-equipped internal combustion engine according to claim 1, wherein the electronic control unit is configured to start the amount reducing control when the combination of the supercharging pressure ratio and the air flow rate has shifted from the two turbos use region to the second turbo use region, and then end the amount reducing control when the pressure of intake gas flowing into a combustion chamber of the internal combustion engine is determined to have started to decrease. 5. An apparatus for a supercharger-equipped internal combustion engine according to claim 1, wherein the electronic control unit is configured to determine whether or not the combination of the supercharging pressure ratio and the air flow rate falls within a first turbo use region which is adjacently located on one side of the two turbos use region where the air flow rate assumes a smaller value as compared with the opposite side, and in which a supercharging effect of the first turbo charger is utilized; andthe electronic control unit is configured to control the first exhaust control valve and the first intake control valve such that the first exhaust bypass area assumes its minimum value, and the first intake bypass area assumes its minimum value, when the combination of the supercharging pressure ratio and the air flow rate is determined to fall within the first turbo use region. 6. An apparatus for a supercharger-equipped internal combustion engine according to claim 1, further comprising: a second exhaust bypass passage which establishes a bypass between a portion of the exhaust passage located between the first and second turbines, and a portion of the exhaust passage located downstream of the second turbine; anda second exhaust control valve disposed in the second exhaust bypass passage and adapted to adjust a second exhaust bypass area, which is the minimum opening sectional area of the second exhaust bypass passage; andthe electronic control unit is configured to control the second exhaust control valve such that the second exhaust bypass area assumes its maximum value only when the combination of the supercharging pressure ratio and the air flow rate falls within a bypass region, which is a portion of the second turbo use region in which the air flow rate assumes a larger value as compared with the remaining portion of the second turbo use region, and the second exhaust bypass area assumes its minimum value when the combination of the supercharging pressure ratio and the air flow rate does not fall within the bypass region. 7. An apparatus for a supercharger-equipped internal combustion engine which is applicable to an internal combustion engine having an exhaust passage branching into first and second exhaust passages at an intermediate point, and an intake passage having first and second intake passages merging together at an intermediate point, the apparatus comprising: a first turbo charger including: a first turbine disposed in the first exhaust passage and driven by energy of an exhaust gas discharged from the engine, and a first compressor disposed in the first intake passage and driven by the first turbine;a second turbo charger including: a second turbine disposed in the second exhaust passage, the second turbine being driven by energy of the exhaust gas discharged from the engine, and being greater in size than the first turbine, and a second compressor disposed in the second intake passage, the second compressor being driven by the second turbine, and being greater in size than the first compressor; a first exhaust bypass passage forming a bypass between a portion of the first exhaust passage located upstream of the first turbine and a portion of the first exhaust passage located downstream of the first turbine;a first intake bypass passage forming a bypass between a portion of the first intake passage located upstream of the first compressor and a portion of the first intake passage located downstream of the first compressor;a second exhaust bypass passage forming a bypass between a portion of the second exhaust passage located upstream of the second turbine and a portion of the second exhaust passage located downstream of the second turbine;a second intake bypass passage forming a bypass between a portion of the second intake passage located upstream of the second compressor and a portion of the second intake passage located downstream of the second compressor;a first exhaust control valve disposed in the first exhaust bypass passage and adapted to adjust a first exhaust bypass area, which is the minimum opening sectional area of the first exhaust bypass passage;a first intake control valve disposed in the first intake bypass passage and adapted to adjust a first intake bypass area, which is the minimum opening sectional area of the first intake bypass passage;a second exhaust control valve disposed in the second exhaust bypass passage and adapted to adjust a second exhaust bypass area, which is the minimum opening sectional area of the second exhaust bypass passage;a second intake control valve disposed in the second intake bypass passage and adapted to adjust a second intake bypass area, which is the minimum opening sectional area of the second intake bypass passage;an electronic control unit programmed to:acquire a supercharging pressure ratio, which is the ratio of the pressure in the intake passage at a position downstream of a merging point between the first and second intake passages to the pressure in the intake passage at a position upstream of the first and second compressors;acquire the flow rate of air passing through the intake passage;determine whether a combination of the supercharging pressure ratio and the air flow rate falls within a two turbos use region in which supercharging effects of both the first and second turbo chargers are utilized, or a second turbo use region which is adjacently located on one side of the two turbos use region where the air flow rate assumes a larger value as compared with the other side thereof and in which a supercharging effect of only the second turbo charger is utilized;control the first and second exhaust control valves and the first and second intake control valves such that the first exhaust bypass area assumes an intermediate value between its minimum and maximum values, the first intake bypass area assumes its minimum value, the second exhaust bypass area assumes an intermediate value between its minimum and maximum values, and the second intake bypass area assumes its minimum value, when the combination of the supercharging pressure ratio and the air flow rate is determined to fall within the two turbos use region, and for controlling the first and second exhaust control valves and the first and second intake control valves such that the first exhaust bypass area assumes its maximum value, the first intake bypass area assumes its maximum value, the second exhaust bypass area assumes its minimum value, and the second intake bypass area assumes its minimum value, when the combination of the supercharging pressure ratio and the air flow rate is determined to fall within the second turbo use region; andinject fuel in an amount based on an operation state of the internal combustion engine, wherein:the electronic control unit is configured to perform, over a predetermined period, amount reducing control for reducing the injection amount of the fuel, when the combination of the supercharging pressure ratio and the air flow rate shifts from the two turbos use region to the second turbo use region, andthe electronic control unit is configured such that: (i) when the amount reducing control is not performed, the electronic control unit injects fuel in a base fuel injection amount determined based on a pressure (Pim) in an intake manifold and a rotational speed (NE) of the internal combustion engine, and (ii) when the amount reducing control is performed, the electronic control unit injects fuel in an amount smaller than the base fuel injection amount. 8. An apparatus for a supercharger-equipped internal combustion engine according to claim 7, wherein the electronic control unit is configured to determine an amount by which the injection amount of the fuel is reduced in the amount reducing control, on the basis of an operation speed of the internal combustion engine and the injection amount of the fuel. 9. An apparatus for a supercharger-equipped internal combustion engine according to claim 7, wherein the electronic control unit is configured such that, when the combination of the supercharging pressure ratio and the air flow rate shifts from the two turbos use region to the second turbo use region, the electronic control unit determines whether or not the amount reducing control is to be performed, on the basis of an operation speed of the internal combustion engine and the injection amount of the fuel. 10. An apparatus for a supercharger-equipped internal combustion engine according to claim 7, wherein the electronic control unit is configured to start the amount reducing control when the combination of the supercharging pressure ratio and the air flow rate has shifted from the two turbos use region to the second turbo use region, and then end the amount reducing control when the pressure of intake gas flowing into a combustion chamber of the internal combustion engine is determined to have started to decrease. 11. An apparatus for a supercharger-equipped internal combustion engine according to claim 7, wherein the electronic control unit is configured to determine whether or not the combination of the supercharging pressure ratio and the air flow rate falls within a first turbo use region which is adjacently located on one side of the two turbos use region where the air flow rate assumes a smaller value as compared with the opposite side, and in which a supercharging effect of the first turbo charger is utilized; and the electronic control unit is configured to control the first and second exhaust control valves and the first and second intake control valves such that the first exhaust bypass area assumes its minimum value, the first intake bypass area assumes its minimum value, the second exhaust bypass area assumes its maximum value, and the second intake bypass area assumes its maximum value, when the combination of the supercharging pressure ratio and the air flow rate is determined to fall within the first turbo use region. 12. An apparatus for a supercharger-equipped internal combustion engine according to claim 7, wherein the electronic control unit is configured to control the second exhaust control valve such that the second exhaust bypass area assumes its maximum value, rather than its minimum value, when the combination of the supercharging pressure ratio and the air flow rate falls within a bypass region, which is a portion of the second turbo use region in which the air flow rate assumes a larger value as compared with the remaining portion of the second turbo use region.
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이 특허에 인용된 특허 (4)
Rodriguez, Rogelio; Soupos, Elias P.; Balekai, Priyankar S., Exhaust gas control in an engine having a two-stage turbocharger.
Kurtz, Eric Matthew; Han, Zhiyu; Baker, Richard Eugene, System and method for reducing NOx emissions during transient conditions in a diesel fueled vehicle.
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