Calibration of an actuator for a variable geometry turbine
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F01D-017/10
F01D-017/20
출원번호
US-0689728
(2010-01-19)
등록번호
US-8727696
(2014-05-20)
우선권정보
GB-0713951.2 (2007-07-18)
발명자
/ 주소
Cox, Calvin Howard
출원인 / 주소
Cummins Turbo Technologies Limited
대리인 / 주소
Krieg DeVault LLP
인용정보
피인용 횟수 :
2인용 특허 :
8
초록▼
A variable geometry turbine of the kind used in a turbocharger has a variable geometry element such as a nozzle ring or an annular array of swing vanes that is operated by an actuator. The actuator has an output shaft coupled to a transmission mechanism for moving the variable geometry element. A ro
A variable geometry turbine of the kind used in a turbocharger has a variable geometry element such as a nozzle ring or an annular array of swing vanes that is operated by an actuator. The actuator has an output shaft coupled to a transmission mechanism for moving the variable geometry element. A rotary sensor device coupled to the output shaft of the actuator has a sensor wheel with a stop, slip clutch mechanism and a rotary position sensor. The device converts movement of the actuator output shaft into rotation of the wheel and the sensor generates an output signal representative of the rotary position of the wheel to provide a value indicative of the position of the variable geometry element. The actuator is calibrated to the position of the variable geometry element by rotating the sensor wheel in a first rotational direction until the variable geometry element reaches the first limit position, then rotating the sensor wheel in a second direction until the variable geometry element reaches the second limit position. The value of the output signal is logged at one of these positions as a limit value. The sensor wheel is allowed to declutch in the event that it encounters the stop in either direction of rotation. The output signal is monitored and the limit value is deducted to determine the position of the variable geometry element.
대표청구항▼
1. A method for automatically calibrating a variable geometry turbine actuator, the turbine having an annular inlet passageway, the passageway being closable at least partially by adjusting the position of a variable geometry element, the variable geometry element being movable between first and sec
1. A method for automatically calibrating a variable geometry turbine actuator, the turbine having an annular inlet passageway, the passageway being closable at least partially by adjusting the position of a variable geometry element, the variable geometry element being movable between first and second limit positions, the method comprising the steps of: a) providing an actuator having an output shaft;b) coupling the actuator output shaft to a transmission mechanism for moving the variable geometry element;c) providing a rotary sensor device coupled to the output shaft of the actuator, the rotary sensor device comprising a sensor wheel with a stop, a clutch mechanism and a rotary position sensor, the rotary sensor device being arranged to convert movement of the actuator output shaft into rotation of the sensor wheel, the sensor wheel having a rotational range that is limited by said stop, the rotary position sensor being configured to generate an output signal representative of the rotary position of the sensor wheel;d) operating the actuator output shaft so as to rotate the sensor wheel in a first rotational direction until the variable geometry element reaches the first limit position;e) operating the actuator output shaft so as to rotate the sensor wheel in a second direction until the variable geometry element reaches the second limit position;f) allowing the sensor device to declutch from the actuator in the event the wheel is prevented from rotating by the stop in either direction of rotation, thereby ensuring the range of movement of the variable geometry element in use occurs within the rotational range of the sensor; andg) logging, as a limit value, the value of said output signal generated when the variable geometry element is at one of said first or second limit positions. 2. A method according to claim 1, wherein the limit value is logged at the second limit position. 3. A method according to claim 2, further comprising the step of operating the actuator output shaft so as to rotate the sensor wheel in said first rotational direction again, after step e) above until the variable geometry element reaches the first limit position. 4. A method according to claim 3, wherein the value of the output signal at said first limit position is logged as a further limit value after the sensor wheel is rotated in the first rotation direction again. 5. A method according to claim 4, further comprising the step of monitoring said output signal during operation of the actuator and deducting one of the limit value or the further limit value from the output signal and using this to determine the position of the variable geometry element. 6. A method according to claim 1, wherein the annular inlet passageway is defined between facing annular walls of the turbine and the variable geometry element is a movable one of the annular walls. 7. A method according to claim 6, wherein said movable annular wall is translatable along its central axis to adjust the width of the annular passageway. 8. A method according to claim 1, further comprising the steps of using the actuator to drive a leadscrew transmission mechanism, said leadscrew mechanism comprising a leadscrew shaft and a leadscrew nut threadedly engaged on a threaded portion of the leadscrew shaft, the leadscrew mechanism being arranged so that rotation of one of said leadscrew shaft and leadscrew nut relative to the other produces linear movement in the other of said leadscrew shaft and leadscrew nut in the direction of the leadscrew axis, the leadscrew transmission mechanism being connected between the variable geometry element and the actuator. 9. A method according to claim 8, the nut being connected to the variable geometry element by a linkage, further comprising the step of driving the leadscrew shaft in rotation and restraining the nut against rotation so as to effect movement in the linkage and therefore the variable geometry element. 10. A method according to claim 1, further comprising the step of using a gear wheel to couple the output shaft and the sensor wheel. 11. A method according to claim 10, further comprising the step of providing a slip clutch between the gear wheel and the sensor wheel. 12. A method according to claim 1, further comprising the step of transmitting the output signal to a microcontroller for digitising. 13. A variable geometry turbine actuator comprising: a turbine wheel mounted within a turbine housing on a shaft for rotation about an axis, the turbine housing defining an annular turbine inlet passageway around the turbine wheel;the passageway being closable at least partially by adjusting the position of a variable geometry element, the variable geometry element being movable between first and second limit positions, a transmission mechanism for moving the variable geometry element; andan actuator coupled to the transmission mechanism for actuating the variable geometry element having an output shaft for coupling to a transmission mechanism for moving the variable element; a rotary sensor device coupled to the output shaft of the actuator, the rotary sensor device comprising a sensor wheel with a stop, a clutch mechanism and a rotary position sensor; the rotary sensor device being arranged to convert movement of the actuator output shaft into rotation of the sensor wheel, the sensor wheel having a rotational range that is limited by the stop, the rotary position sensor being configured to generate an output signal representative of the rotary position of the sensor wheel; the sensor wheel being rotatable by the actuator in a first rotational direction until the variable element reaches the first limit position and in a second rotational direction until the variable element reaches the second limit position; the clutch mechanism allowing the sensor wheel to declutch in the event that it encounters the stop in either direction of rotation. 14. A variable geometry turbine actuator according to claim 13, wherein the variable geometry element is a movable annular wall defining part of said passageway. 15. A variable geometry turbine actuator according to claim 14, wherein the movable wall is translatable along an axis to adjust the width of the annular passageway. 16. A variable geometry turbine actuator according to claim 15, wherein the movable wall is connected to a linkage for connection to the transmission mechanism. 17. A comprising a variable geometry turbine actuator according to claim 13, and further comprising a rotary shaft on which said turbine wheel is mounted, a compressor wheel mounted within a compressor housing on the other end of said rotary shaft for rotation with the turbine wheel about said axis. 18. A variable geometry turbine actuator according to claim 17, wherein a bearing housing is interposed between the turbine and compressor housings, the actuator being mounted in the bearing housing. 19. A variable geometry turbine actuator according to claim 17 connected to an engine management system, the output signal being transmitted to a processor in an engine management system for recording an offset value when the variable geometry element reaches one of the first or second limiting positions.
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