IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0731216
(2007-03-30)
|
등록번호 |
US-7840333
(2011-01-22)
|
발명자
/ 주소 |
- Mehrer, Michael E.
- Suttie, Peter J.
- Seguritan, Alex
- Marion, Gilles E.
|
출원인 / 주소 |
- Hamilton Sundstrand Corporation
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
9 인용 특허 :
5 |
초록
▼
An event-driven starter controller regulates the speed of a gas turbine engine based on detected events. The event-driven starter controller is used to supply motive force to the gas turbine engine prior such that the gas turbine engine is able to ignite (i.e., achieve light-off). In particular, in
An event-driven starter controller regulates the speed of a gas turbine engine based on detected events. The event-driven starter controller is used to supply motive force to the gas turbine engine prior such that the gas turbine engine is able to ignite (i.e., achieve light-off). In particular, in response to engine speed reaching a defined threshold, the event-driven starter controller causes the speed of the starter motor to ramp or increase through a defined range of speeds suitable for engine light-off (i.e, light-off window). Upon reaching an upper threshold of the light-off window, the event-driven starter controller causes the speed of the starter motor to decrease through the range of speeds suitable for engine light-off. If at any time during the light-off window the event-driven starter controller detects a successful light-off condition, the event-driven starter controller causes the speed of the gas turbine engine to increase toward a second threshold.
대표청구항
▼
The invention claimed is: 1. A starter controller that controls the speed of a gas turbine engine during start-up, the starter controller comprising: an event detector that detects events associated with the start-up of the gas turbine engine based on inputs that include an engine start request, an
The invention claimed is: 1. A starter controller that controls the speed of a gas turbine engine during start-up, the starter controller comprising: an event detector that detects events associated with the start-up of the gas turbine engine based on inputs that include an engine start request, an engine speed measurement, and a light-off detection measurement; and a torque controller that generates a torque command that causes the speed of the gas turbine engine to increase at a defined rate until the event detector detects a light-off event and causes the speed of the gas turbine engine to increase at an increased rate following detection of the light-off event, wherein if the measured speed of the gas turbine engine increases to a upper threshold without the event detector detecting a light-off event, then the torque controller generates a torque command that causes the speed of the gas turbine engine to decrease at a defined rate until the event detector detects a light-off event or the measured speed of the gas turbine engine reaches a lower threshold. 2. The starter controller of claim 1, wherein the torque controller includes: a speed selector switch that is controlled based on events detected by the event detector to select from one of a number of speed inputs including an engine off speed, a first set-point, a ramping input, and a second set-point, wherein the speed inputs are used by the torque controller to control the speed of the gas turbine engine. 3. The starter controller of claim 2, wherein the torque controller includes: a comparator for comparing the speed input provided by the speed selector switch to the measured engine speed; and a proportional-integral (PI) controller that generates the torque command that controls the speed of the gas turbine engine, wherein the torque command is based on the comparison between the speed input and the measured engine speed. 4. The starter controller of claim 3, wherein the torque controller includes: a ramp rate sequencer that generates the ramping input that is provided to the speed selector switch, wherein the ramp rate sequencer causes the ramping input to increase in magnitude at a defined rate until the engine speed reaches the upper threshold, wherein upon reaching the upper threshold the ramp rate sequencer causes the ramping input to decrease in magnitude at a defined rate. 5. The starter controller of claim 1, wherein the torque controller includes: a cut-off detector that prevents torque from being provided to the gas turbine engine in response to the engine speed reaching a third threshold value following detection of a successful light-off event. 6. The starter controller of claim 2, wherein the event detector includes: means for detecting events and generating a numerical value representing the detected events, wherein the numerical value of means for detecting events is provided to the speed selector switch to select between the number of speed inputs. 7. A method of controlling speed of a gas turbine engine during start-up by providing motive force to the gas turbine engine, the method comprising: controlling the speed of the gas turbine engine to increase toward a first speed set-point in response to a detected engine start request; controlling the speed of the gas turbine engine to increase at a defined rate in response to the engine speed reaching a first threshold value; controlling the speed of the gas turbine engine to increase towards a second set-point in response to a detected successful light-off event; and controlling the speed of the gas turbine engine to decrease at a defined rate in response to the engine speed being increased at the define rate to an upper threshold value without achieving light-off. 8. The method of claim 7, further including: controlling the motive power provided to the gas turbine engine to be reduced to zero in response to the engine speed of the gas turbine engine reaching a second threshold value that indicates the gas turbine engine is self-sustaining. 9. The method of claim 7, further including: controlling the motive power provided to the gas turbine engine to be reduced to zero in response to the engine speed being decreased at the define rate to a lower threshold value without achieving light-off. 10. The method of claim 7, wherein the upper threshold and lower threshold define a range of engine speeds known to be conducive to light-off of the gas turbine engine. 11. The method of claim 7, wherein controlling the speed of the gas turbine engine to increase toward the first speed set-point includes: comparing the first-speed set-point to a measured value of the engine speed; and generating a torque command that is provided to a starter motor based on the comparison between the first speed set-point and the measured engine speed. 12. The method of claim 7, wherein the first speed-set point is greater than the first threshold, such that the gas turbine engine is controlled to increase at the defined rate prior to the gas turbine engine reaching the first speed set-point. 13. An event-driven starter controller for providing motive force to a gas turbine engine during start-up, the starter controller comprising: means for detecting events associated with the start-up of the gas turbine engine based on inputs that include a start engine request, a measured engine speed, and a successful light-off; means for controlling the speed of the gas turbine engine to increase toward a first speed set-point in response to detection of a start engine request; means for controlling the speed of the gas turbine engine to increase at a first defined rate in response to detection of the engine speed reaching a first threshold value; means for controlling the speed of the gas turbine engine to increase towards a second set-point in response to a detected successful light-off of the gas turbine engine; and means for controlling the speed of the gas turbine engine to decrease at a second defined rate in response to detection of the engine speed being increased at the defined rate to an upper threshold value without achieving light-off. 14. The event-driven starter controller of claim 13, further including: means for removing the supply of motive force to the gas turbine engine in response to the engine speed reaching a second threshold value following detection of a successful light-off of the gas turbine engine. 15. The event-driven starter controller of claim 13, wherein the means for controlling the speed of the gas turbine engine includes: a speed selector switch that is controlled based on events detected by the means for detecting events to select from one of a number of speed inputs including an engine off speed, a first set-point, a ramping input, and a second set-point, wherein the speed inputs are used by the torque controller to control the speed of the gas turbine engine. a comparator for comparing the speed input provided by the speed selector switch to the measured engine speed; and a proportional-integral (PI) controller that generates the torque command that controls the speed of the gas turbine engine, wherein the torque command is based on the comparison between the speed input and the measured engine speed. 16. The event-driven starter controller of claim 15, wherein the means for controlling the speed of the gas turbine engine to increase at a first defined rate includes: a ramp rate sequencer that generates the ramping input that is provided to the speed selector switch, wherein the ramp rate sequencer causes the ramping input to increase in magnitude at a defined rate until the engine speed reaches the upper threshold, wherein upon reaching the upper threshold the ramp rate sequencer causes the ramping input to decrease in magnitude at a defined rate.
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