System for limiting rotational speed of a turbocharger
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02B-033/44
F02D-023/00
출원번호
US-0223331
(2005-09-09)
발명자
/ 주소
Baize,Scott R.
Dukes,Jason V.
Rehm, IV,Norbert J.
Dunnuck,Dave L.
출원인 / 주소
Cummins, Inc.
대리인 / 주소
Barnes &
인용정보
피인용 횟수 :
10인용 특허 :
23
초록▼
A system for limiting the rotational speed of a turbocharger is disclosed. The turbocharger includes a compressor having an outlet fluidly coupled to an intake manifold of an internal combustion engine and a compressor outlet, a turbine having an inlet fluidly coupled to an exhaust manifold of the e
A system for limiting the rotational speed of a turbocharger is disclosed. The turbocharger includes a compressor having an outlet fluidly coupled to an intake manifold of an internal combustion engine and a compressor outlet, a turbine having an inlet fluidly coupled to an exhaust manifold of the engine and an outlet. A control computer is configured to compute a maximum compressor outlet pressure value as a function of the compressor inlet pressure, the compressor inlet temperature, an operating condition other than the compressor inlet pressure or temperature and a maximum allowable turbocharger speed value, and to control a turbine swallowing capacity or efficiency control mechanism in a manner that limits compressor outlet pressure to the maximum compressor outlet pressure value to thereby limit rotational speed of the turbocharger to the maximum turbocharger speed value. The operating condition may be, for example, engine intake air flow rate or engine speed.
대표청구항▼
What is claimed is: 1. System for limiting turbocharger rotational speed, comprising: a turbocharger having a compressor defining a compressor outlet fluidly coupled to an intake manifold of an internal combustion engine and a compressor inlet, and having a turbine defining an exhaust gas inlet flu
What is claimed is: 1. System for limiting turbocharger rotational speed, comprising: a turbocharger having a compressor defining a compressor outlet fluidly coupled to an intake manifold of an internal combustion engine and a compressor inlet, and having a turbine defining an exhaust gas inlet fluidly coupled to an exhaust manifold of the engine and an exhaust gas outlet; a first pressure sensor producing a first pressure signal indicative of pressure at the compressor inlet; a first temperature sensor producing a first temperature signal indicative of temperature at the compressor inlet; means for determining an operating condition other than the pressure and the temperature at the compressor inlet, and producing a corresponding operating condition indicator; a control mechanism for controlling a swallowing capacity or efficiency of the turbine; and a control computer determining a maximum compressor outlet pressure value as a function of the first pressure signal, the first temperature signal, the operating condition indicator and a maximum turbocharger speed value, and controlling the control mechanism in a manner that limits compressor outlet pressure to the maximum compressor outlet pressure value to thereby limit rotational speed of the turbocharger to the maximum turbocharger speed value. 2. The system of claim 1 wherein the control mechanism includes the turbine configured as a variable geometry turbine, the variable geometry turbine responsive to a control signal produced by the control computer to modify the swallowing capacity of the turbine in a manner that limits the compressor outlet pressure to the maximum compressor outlet pressure value. 3. The system of claim 1 wherein the control mechanism includes a wastegate fluidly coupled between the exhaust gas inlet and the exhaust gas outlet of the turbine, the wastegate responsive to a control signal produced by the control computer to selectively divert exhaust gas therethrough and away from the exhaust gas inlet of the turbine in a manner that limits the compressor outlet pressure to the maximum compressor outlet pressure value. 4. The system of claim 1 wherein the control mechanism includes an exhaust throttle responsive to a control signal produced by the control computer to selectively control the flow rate of exhaust gas through the turbine in a manner that limits the compressor outlet pressure to the maximum compressor outlet pressure value. 5. The system of claim 1 wherein the means for determining an operating condition is an engine speed sensor producing an engine speed signal indicative of engine rotational speed; and wherein the operating condition indicator is the engine speed signal. 6. The system of claim 5 further including a memory having a three-dimensional map stored therein, the map having a first dimension in the form of a compressor pressure ratio defined by a ratio of the compressor outlet pressure and the pressure of air at the compressor inlet, a second dimension in the form of a corrected maximum turbocharger speed value computed as a function of the maximum turbocharger speed value and the first temperature signal, and a third dimension in the form of engine speed; and wherein the control computer is operable to determine the maximum compressor outlet pressure value by mapping current values of the corrected maximum turbocharger speed value and the engine speed signal to a current value of the compressor pressure ratio via the map and then multiplying the mapped value of the compressor pressure ratio by a current value of the first pressure signal. 7. The system of claim 1 wherein the means for determining an operating condition is a means for determining an engine intake air flow rate corresponding to a flow rate of air entering the engine via the intake manifold; and wherein the operating condition indicator is an engine intake air flow rate indicator. 8. The system of claim 7 further including: an engine speed sensor producing an engine speed signal indicative of rotational speed of the engine; a second pressure sensor producing a second pressure signal indicative of pressure at the outlet of the compressor; and a second temperature sensor producing a second temperature signal indicative of temperature within the intake manifold; and wherein the means for determining an engine intake air flow rate includes means for estimating the engine intake air flow rate indicator in the form of an engine intake air flow rate value as a function of the engine speed signal, the second pressure signal and the second temperature signal. 9. The system of claim 7 wherein the means for determining an engine intake air flow rate is a mass air flow sensor producing the engine intake air flow rate indicator in the form of an engine intake air flow rate signal corresponding to flow rate of air supplied from the compressor outlet to the intake manifold. 10. The system of claim 7 further including a memory having a three-dimensional map stored therein, the map having a first dimension in the form of a compressor pressure ratio defined by a ratio of the compressor outlet pressure and the pressure of air at the compressor inlet, a second dimension in the form of a corrected maximum turbocharger speed value computed as a function of the maximum turbocharger speed value and the first temperature signal, and a third dimension in the form of a corrected mass air flow computed as a function of the engine air inlet flow rate indicator, the first pressure signal and the first temperature signal; and wherein the control computer is operable to determine the maximum compressor outlet pressure value by mapping current values of the corrected maximum turbocharger speed value and the corrected mass air flow to a current value of the compressor pressure ratio via the map and then multiplying the mapped value of the compressor pressure ratio by a current value of the first pressure signal. 11. System for limiting turbocharger rotational speed, comprising: a turbocharger having a compressor defining a compressor outlet fluidly coupled to an intake manifold of an internal combustion engine and a compressor inlet, and having a turbine defining an exhaust gas inlet fluidly coupled to an exhaust manifold of the engine and an exhaust gas outlet, a first pressure sensor producing a first pressure signal indicative of pressure at the compressor inlet, a first temperature sensor producing a first temperature signal indicative of temperature at the compressor inlet, means for determining an operating condition other than the pressure and the temperature at the compressor inlet, and producing a corresponding operating condition indicator, a control mechanism for controlling a swallowing capacity or efficiency of the turbine, and a control computer electrically coupled to the first pressure sensor, to the first temperature sensor, to the means for determining an operating condition other than the pressure and the temperature at the compressor inlet, to the control mechanism, and to a memory unit, the memory unit having stored therein a plurality of instructions which, when executed by the control computer, cause the control computer to determine a maximum compressor outlet pressure value as a function of the first pressure signal, the first temperature signal, the operating condition indicator and a maximum turbocharger speed value, and to control the control mechanism in a manner that limits compressor outlet pressure to the maximum compressor outlet pressure value to thereby limit rotational speed of the turbocharger to the maximum turbocharger speed value. 12. The system of claim 11 wherein the control mechanism includes the turbine configured as a variable geometry turbine, the variable geometry turbine responsive to a control signal produced by the control computer to modify the swallowing capacity of the turbine in a manner that limits the compressor outlet pressure to the maximum compressor outlet pressure value. 13. The system of claim 11 wherein the control mechanism includes a wastegate fluidly coupled between the exhaust gas inlet and the exhaust gas outlet of the turbine, the wastegate responsive to a control signal produced by the control computer to selectively divert exhaust gas therethrough and away from the exhaust gas inlet of the turbine in a manner that limits the compressor outlet pressure to the maximum compressor outlet pressure value. 14. The system of claim 11 wherein the control mechanism includes an exhaust throttle responsive to a control signal produced by the control computer to selectively modify the flow rate of exhaust gas through the turbine in a manner that limits the compressor outlet pressure to the maximum compressor outlet pressure value. 15. The system of claim 11 wherein the control mechanism includes an exhaust throttle controllable by the means for controlling the control mechanism to selectively modify the flow rate of exhaust gas through the turbine in a manner that limits the compressor outlet pressure to the maximum compressor outlet pressure value. 16. The system of claim 11 wherein the means for determining an operating condition is an engine speed sensor producing an engine speed signal indicative of engine rotational speed, and wherein the operating condition indicator is the engine speed signal. 17. The system of claim 16 wherein the memory unit has a three-dimensional map stored therein, the map having a first dimension in the form of a compressor pressure ratio defined by a ratio of the compressor outlet pressure and the pressure of air at the compressor inlet, a second dimension in the form of a corrected maximum turbocharger speed value computed as a function of the maximum turbocharger speed value and the first temperature signal, and a third dimension in the form of engine speed, and wherein the plurality of instructions stored in the memory unit, when executed by the control computer, cause the control computer to determine the maximum compressor outlet pressure value by mapping current values of the corrected maximum turbocharger speed value and the engine speed signal to a current value of the compressor pressure ratio via the map, and to then multiply the mapped value of the compressor pressure ratio by a current value of the first pressure signal. 18. The system of claim 11 wherein the means for determining an operating condition is a means for determining an engine intake air flow rate corresponding to a flow rate of air entering the engine via the intake manifold, and wherein the operating condition indicator is an engine intake air flow rate indicator. 19. The system of claim 18 further including: an engine speed sensor producing an engine speed signal indicative of rotational speed of the engine, a second pressure sensor producing a second pressure signal indicative of pressure at the outlet of the compressor, and a second temperature sensor producing a second temperature signal indicative of temperature within the intake manifold, and wherein the means for determining an engine intake air flow rate includes means for estimating the engine intake air flow rate indicator in the form of an engine intake air flow rate value as a function of the engine speed signal, the second pressure signal and the second temperature signal. 20. The system of claim 18 wherein the means for determining an engine intake air flow rate is a mass air flow sensor producing the engine intake air flow rate indicator in the form of an engine intake air flow rate signal corresponding to flow rate of air supplied from the compressor outlet to the intake manifold. 21. The system of claim 18 wherein the memory unit has a three-dimensional map stored therein, the map having a first dimension in the form of a compressor pressure ratio defined by a ratio of the compressor outlet pressure and the pressure of air at the compressor inlet, a second dimension in the form of a corrected maximum turbocharger speed value computed as a function of the maximum turbocharger speed value and the first temperature signal, and a third dimension in the form of a corrected mass air flow computed as a function of the engine air inlet flow rate indicator, the first pressure signal and the first temperature signal, and wherein the plurality of instructions stored in the memory unit, when executed by the control computer, cause the control computer to determine the maximum compressor outlet pressure value by mapping current values of the corrected maximum turbocharger speed value and the corrected mass air flow to a current value of the compressor pressure ratio via the map, and to then multiply the mapped value of the compressor pressure ratio by a current value of the first pressure signal. 22. System for limiting turbocharger rotational speed, comprising: a turbocharger having a compressor defining a compressor outlet fluidly coupled to an intake manifold of an internal combustion engine and a compressor inlet, and having a turbine defining an exhaust gas inlet fluidly coupled to an exhaust manifold of the engine and an exhaust gas outlet, means for determining pressure at the compressor inlet, means for determining a temperature at the compressor inlet, means for determining an operating condition other than the pressure and the temperature at the compressor inlet, a control mechanism for controlling a swallowing capacity or efficiency of the turbine, means for determining a maximum compressor outlet pressure value as a function of the pressure at the compressor inlet, the temperature at the compressor inlet, the operating condition other than the pressure and the temperature at the compressor inlet and a maximum turbocharger speed value, and means for controlling the control mechanism in a manner that limits compressor outlet pressure to the maximum compressor outlet pressure value to thereby limit rotational speed of the turbocharger to the maximum turbocharger speed value. 23. The system of claim 22 wherein the control mechanism includes the turbine configured as a variable geometry turbine, the variable geometry turbine controllable by the means for controlling the control mechanism to modify the swallowing capacity of the turbine in a manner that limits the compressor outlet pressure to the maximum compressor outlet pressure value. 24. The system of claim 22 wherein the control mechanism includes a wastegate fluidly coupled between the exhaust gas inlet and the exhaust gas outlet of the turbine, the wastegate controllable by the means for controlling the control mechanism to selectively divert exhaust gas therethrough and away from the exhaust gas inlet of the turbine in a manner that limits the compressor outlet pressure to the maximum compressor outlet pressure value.
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