IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0334464
(2006-01-19)
|
등록번호 |
US-7503175
(2009-03-17)
|
우선권정보 |
JP-2005-018161(2005-01-26) |
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
4 인용 특허 :
11 |
초록
▼
A control system for an internal combustion engine includes a turbocharger and a throttle valve. The turbocharger that is adapted to supercharging intake air drawn into the internal combustion engine utilizing energy of exhaust gas of the internal combustion engine. The turbocharger includes an elec
A control system for an internal combustion engine includes a turbocharger and a throttle valve. The turbocharger that is adapted to supercharging intake air drawn into the internal combustion engine utilizing energy of exhaust gas of the internal combustion engine. The turbocharger includes an electric generator that is adapted to generating regenerative electric power utilizing energy of exhaust gas. The throttle valve is adapted to controlling a flow amount of intake air supercharged using the turbocharger. An operating condition detecting unit is adapted to detecting an operating condition of at least one of the turbocharger and the electric generator. The throttle opening correcting unit is adapted to correcting opening degree of the throttle valve on the basis of the operating condition of the at least one of the turbocharger and the electric generator, when the electric generator regenerates regenerative electric power.
대표청구항
▼
What is claimed is: 1. A control system for an internal combustion engine, the system comprising: a turbocharger configured to supercharge intake air drawn into the internal combustion engine utilizing energy of exhaust gas of the internal combustion engine, the turbocharger including an electric g
What is claimed is: 1. A control system for an internal combustion engine, the system comprising: a turbocharger configured to supercharge intake air drawn into the internal combustion engine utilizing energy of exhaust gas of the internal combustion engine, the turbocharger including an electric generator configured to generate regenerative electric power utilizing energy of exhaust gas; a throttle valve configured to control a flow amount of intake air supercharged using the turbocharger; an operating condition detecting unit configured to detect an operating condition of at least one of the turbocharger and the electric generator; and a throttle opening correcting unit configured to correct an opening degree of the throttle valve on the basis of the operating condition of the at least one of the turbocharger and the electric generator in response to generating of regenerative electric power by the electrical generator; wherein the operating condition detecting unit includes an intake pressure detecting unit that is configured to detect intake pressure downstream of the turbocharger with respect to an airflow direction; wherein the throttle opening correcting unit is configured to calculate an opening degree correcting amount of the throttle valve on the basis of the intake pressure detected by the intake pressure detecting unit; and wherein the throttle opening correcting unit increases the opening degree correcting amount of the throttle valve as the intake pressure detected by the intake pressure detecting unit decreases. 2. The system according to claim 1, wherein the opening degree of the throttle valve is increased as the opening degree correcting amount of the throttle valve is increased. 3. The system according to claim 1, further comprising: an EGR device that includes an EGR pipe and an EGR control valve, the EGR pipe configured to return exhaust gas of the internal combustion engine partially into an intake passage on the downstream side of the throttle valve with respect to an airflow direction, the EGR control valve configured to control an EGR amount, for which exhaust gas returns through the EGR pipe; and an EGR rate correcting unit configured to correct the opening degree of the EGR control valve on the basis of the opening degree correcting amount of the throttle valve. 4. The system according to claim 1, wherein the operating condition detecting unit includes an electric power generation detecting unit configured to detect an amount of electric power generated by the electric generator; and wherein the throttle opening correcting unit calculates an opening degree correcting amount of the throttle valve on the basis of the amount of electric power detected using the electric power generation detecting unit. 5. The system according to claim 4, wherein the throttle opening correcting unit increases the opening degree correcting amount of the throttle valve as the amount of electric power generation detected by the electric power generation detecting unit increases. 6. The system according to claim 4, further comprising: an EGR device having an EGR pipe and an EGR control valve, the EGR pipe configured to return exhaust gas of the internal combustion engine partially into an intake passage on the downstream side of the throttle valve with respect to an airflow direction, the EGR control valve configured to control an EGR amount by which exhaust gas returns through the EGR pipe; and an EGR rate correcting unit configured to correct the opening degree of the EGR control valve on the basis of the opening degree correcting amount of the throttle valve. 7. The system according to claim 1, wherein the turbocharger includes a compressor and a turbine, wherein the compressor is rotatably accommodated in an engine intake pipe, wherein the turbine is rotatably accommodated in an engine exhaust pipe, wherein the electric generator is provided between the compressor and the turbine, wherein the electric generator is substantially coaxial with the compressor and the turbine, and wherein the electric generator is an electrically operated generator configured to assist supercharging by rotating the compressor and the turbine as an electric motor. 8. The system according to claim 7, further comprising: a supercharging assist determining unit configured to evaluate whether the supercharging assist is required; and a mode switching unit configured to switch between a supercharging assist mode, in which the electrically operated generator drives the turbocharger, and an electric power regenerating mode, in which the turbocharger drives the electrically operated generator, wherein the mode switching unit selectively performs the switching operation to one of the supercharging assist mode and the electric power regenerating mode on the basis of a determination made by the supercharging assist determining unit. 9. A control system for an internal combustion engine that connects with an intake pipe and an exhaust pipe, the system comprising: a turbocharger that includes a compressor, a turbine, and an electric generator, the compressor being rotatably accommodated in the intake pipe, the turbine being rotatably accommodated in the exhaust pipe, and the electric generator being arranged between the compressor and the turbine; a throttle valve that is rotatably accommodated in the intake pipe downstream of the compressor; a control unit configured to control the throttle valve for throttling a flow area in the intake pipe; an EGR pipe that connects the exhaust pipe with the intake pipe, the EGR pipe connecting with a location downstream of the throttle valve in the intake pipe; and an EGR control valve configured to throttle a flow area in the EGR pipe, wherein the control unit controls the throttle valve to open in response to generation of electric power by the electrical generator; and wherein the control unit controls the EGR control valve to open when the control unit controls the throttle valve to open in response to generation of electric power by the electrical generator. 10. The system according to claim 9, wherein the turbine is configured to utilize energy of exhaust gas for supercharging intake air, which is drawn into the internal combustion engine using the compressor, wherein the electric generator is configured to drive the compressor to assist supercharging by the compressor, and wherein the control unit controls the throttle valve to close at least partially in response to the electric generator's assistance of supercharging by the compressor. 11. The system according to claim 10, wherein the control unit controls the EGR control valve to open in response to an increase in pressure in the intake pipe when the electric generator assists supercharging of the turbine. 12. A control system for an internal combustion engine that connects with an intake pipe and an exhaust pipe, the system comprising: a turbocharger that includes a compressor, a turbine, and an electric generator, the compressor being rotatably accommodated in the intake pipe, the turbine being rotatably accommodated in the exhaust pipe, and the electric generator being arranged between the compressor and the turbine; a throttle valve that is rotatably accommodated in the intake pipe downstream of the compressor; and a control unit configured to control the throttle valve to throttle a flow area in the intake pipe, wherein the control unit controls the throttle valve to open in response to a reduction in pressure in the intake pipe, the reduction in pressure caused by regenerating of electric power by the electric generator which includes the application of a load to the electric generator that reduces a rotation speed of the generator. 13. The control system according to claim 12, wherein the control unit controls the throttle valve to open in response to a condition in which: pressure in the intake pipe decreases because of the reduction in rotation speed of the electric generator; and a rotation speed of the internal combustion engine is less than a predetermined value. 14. The control system according to claim 12, wherein the control unit controls the throttle valve to open in response to a condition in which: pressure in the intake pipe decreases because of the reduction in rotation speed of the electric generator; and the internal combustion engine is in an idling condition. 15. A control system for an internal combustion engine, the system comprising: a turbocharger that supercharges intake air drawn into the internal combustion engine utilizing energy of exhaust gas of the internal combustion engine, the turbocharger including an electric generator that generates regenerative electric power utilizing energy of exhaust gas; a throttle valve that controls a flow amount of intake air supercharged by the turbocharger; an operating condition detector that detects an operating condition of at least one of the turbocharger and the electric generator; a throttle opening correcting unit configured to correct an opening degree of the throttle valve on the basis of the operating condition of the turbocharger and/or the electric generator in response to regeneration of regenerative electric power by the electrical generator. 16. A control system for an internal combustion engine, the system comprising: a turbocharger configured to supercharge intake air drawn into the internal combustion engine utilizing energy of exhaust gas of the internal combustion engine, the turbocharger including an electric generator configured to generate regenerative electric power utilizing the energy of the exhaust gas; a throttle valve configured to control a flow amount of intake air supercharged by the turbocharger; an operating condition detecting unit configured to detect an operating condition of at least one of the turbocharger and the electric generator; a throttle opening correcting unit configured to correct an opening degree of the throttle valve on the basis of the operating condition of the at least one of the turbocharger and the electric generator in response to regenerating of regenerative electric power by the electrical generator; wherein the operating condition detecting unit includes an electric power generation detecting unit that is configured to detect an amount of electric power generated using the electric generator; the throttle opening correcting unit calculates an opening degree correcting amount of the throttle valve on the basis of the amount of electric power detected by the electric power generation detecting unit; and the throttle opening correcting unit increases the opening degree correcting amount of the throttle valve as the amount of electric power generation detected by the electric power generation detecting unit increases. 17. The control system according to claim 16, wherein the operating condition detecting unit includes an intake pressure detecting unit that is configured to detect intake pressure downstream of the turbocharger with respect to an airflow direction; wherein the throttle opening correcting unit is configured to calculate an opening degree correcting amount for the throttle valve on the basis of the intake pressure detected by the intake pressure detecting unit; and wherein the throttle opening correcting unit increases the opening degree correcting amount for the throttle valve as the intake pressure detected by the intake pressure detecting unit decreases. 18. The control system according to claim 1, further comprising: a power regeneration detection unit configured to detect a condition indicating that the electrical generator is generating regenerative electric power; wherein the throttle opening correcting unit is configured to correct the opening degree of the throttle valve on the basis of the operating condition of the at least one of the turbocharger and the electric generator in response to a detection by the power regeneration detection unit of the condition indicating that the electrical generator is generating regenerative electric power. 19. The control system according to claim 16, further comprising: a power regeneration detection unit configured to detect a condition indicating that the electrical generator is generating regenerative electric power; wherein the throttle opening correcting unit is configured to correct the opening degree of the throttle valve on the basis of the operating condition of the at least one of the turbocharger and the electric generator in response to a detection by the power regeneration detection unit of the condition indicating that the electrical generator is generating regenerative electric power.
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