1. A method comprising:
establishing a rotational speed of a gas turbine engine fan;
determining a first error signal based upon the difference between the rotational speed and an operational reference speed;
weighting the first error signal based upon a rotational acceleration of an engine core;
accumulating the first error signal to create a first accumulation value;
determining a second error signal based upon the difference between the rotational speed and a commanded reference speed;
accumulating the second error signal to create a second accumulation value; and
setting a fault indication when either the second accumulation value or the first accumulation value exceeds a threshold.
2. The method of claim 1, wherein accumulating the first error signal includes integrating the first error signal with an integrator, wherein the rotational speed is N1 and the operational reference speed is a maximum N1.
3. The method of claim 1, wherein accumulating the second error signal includes integrating the second error signal with an integrator, wherein the rotational speed is N1 and the commanded reference speed is an autopilot commanded N1.
4. The method of claim 1, which further includes limiting the first accumulation value within a first selected accumulation value limit.
5. The method of claim 1, which further includes resetting the first accumulation value to an initial condition.
6. The method of claim 5, which further includes satisfying a reset condition prior to resetting the first accumulation value.
7. The method of claim 6, wherein the reset condition is selected from a group that comprises whether a throttle command indicates an increase in power command; whether the controller lane is in control; and whether the engine core is decelerating.
8. The method of claim 1, which further includes prohibiting a fault indication when the gas turbine engine is in a reversionary mode, when a main metering valve is in an open loop backup mode, or when the engine has completed a start sequence for less than a selected time period.
9. A method, comprising:
establishing a rotational speed of a gas turbine engine compressor fan;
establishing a rotational acceleration of a compressor;
forming an error signal based upon the difference between a reference speed and the rotational speed of the gas turbine engine compressor fan and accumulating the error signal to form an accumulated value;
weighting the error signal based upon a rotational acceleration of the compressor;
determining a fault signal based upon the reference speed, the rotational speed of the gas turbine engine compressor fan, and the rotational acceleration of the compressor; and
setting a fault indication when the fault signal exceeds a threshold.
10. The method of claim 9, wherein weighting the error signal is determined by multiplying the error signal by a gain determined from a gain schedule.
11. The method of claim 9, which further includes resetting the fault indication.
12. The method of claim 9, which further includes prohibiting a fault condition.
13. An apparatus, comprising:
a gas turbine engine including a compressor rotor;
a sensor operable to generate a sensed value representative of the speed of the compressor rotor;
a controller for use with the gas turbine engine having:
an operational reference value representative of a first monitored condition;
a first error value representative of the difference between the sensed value and the operational reference value;
a weight based upon a rotational acceleration of an engine core and applied to the first error value;
a commanded reference value representative of a second monitored condition;
a second error value representative of the difference between the sensed value and the commanded reference value; and
a fault detector responsive to the first error value, and operable to accumulate the first error value, and responsive to the second error value and operable to accumulate the second error value, and configured to set a fault indicator when either the first accumulation value or the second accumulation value exceeds a threshold.
14. The apparatus of claim 13, wherein the controller further includes a means for resetting the fault detector.
15. The apparatus of claim 13, wherein the controller further includes a protection configured to prevent a false or unintended failure indicator.
16. The apparatus of claim 13, wherein the operational reference value comprises a maximum reference value, the commanded reference value comprises an autopilot commanded reference value, and the controller is configured to limit the first accumulation value within a first selected accumulation value limit.
17. The apparatus of claim 13, wherein the controller is configured to reset the first accumulation value to an initial condition, and the controller is configured to determine whether a reset condition is satisfied and to reset the first accumulation value if the controller determines that the reset condition is satisfied.
18. The apparatus of claim 17, wherein the reset condition is selected from a group that comprises whether a throttle command indicates an increase in power command; whether the controller lane is in control; and whether the engine core is decelerating.
19. The apparatus of claim 13, wherein the controller is configured to prohibit setting of a fault indicator when the gas turbine engine is in a reversionary mode, when a main metering valve is in an open loop backup mode, or when the engine has completed a start sequence for less than a selected time period.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A semiconductor integrated circuit, comprising:
a light emitting diode driver that drives a light emitting diode which is a backlight source of a liquid crystal display panel;
a regulator that stabilizes an externally supplied power supply voltage, the regulator supplying a power supply voltage which is stabilized to a liquid crystal driver that drives the liquid crystal panel;
a level shifter that shifts a level of image data supplied to a data input terminal, the level shifter supplying, to the liquid crystal driver, image data that has a level corresponding to the power supply voltage stabilized by the regulator; and
a control circuit that switches onoff an operation of at least one of the light emitting diode driver and the regulator, in accordance with a command supplied to the data input terminal
2. The semiconductor integrated circuit according to claim 1, wherein the control circuit starts, in accordance with a first command supplied to the data input terminal, an operation of the regulator, and thereafter starts an operation of the light emitting diode driver as well as a supplying of image data to the liquid crystal driver.
3. The semiconductor integrated circuit according to claim 2, wherein the control circuit stops an operation of the light emitting diode driver in accordance with a second command supplied to the data input terminal.
4. The semiconductor integrated circuit according to claim 3, wherein the control circuit stops the supplying of the image data to the light emitting diode driver, in accordance with a third command supplied to the data input terminal.
5. The semiconductor integrated circuit according to claim 1, further comprising a communication interface that converts serial data supplied to the data input terminal to parallel data.
6. The semiconductor integrated circuit according to claim 5, wherein the communication interface outputs image data contained in the parallel data to frame memory, and outputs a command contained in the parallel data to the control circuit.
7. The semiconductor integrated circuit according to claim 6, wherein the level shifter shifts a level of parallel image data read out from the frame memory.
8. The semiconductor integrated circuit according to claim 1, further comprising
a second regulator for stabilizing an externally supplied power supply voltage, so as to generate a first voltage; and
a boost circuit for boosting the first voltage and generating a second voltage, so as to supply the second voltage obtained to the light emitting diode which is the backlight sources of the liquid crystal display panel.
9. The semiconductor integrated circuit according to claim 8, wherein a voltage supply circuit boosts the first voltage by a factor of N so as to generate the second voltage, where N is an integer greater than or equal to 2.
10. A power source system interface, comprising:
the semiconductor integrated circuit according to claim 1;
a resistor; and
a capacitor,
both of which being externally supplied to the semiconductor integrated circuit.
11. An electronic apparatus comprising the semiconductor integrated circuit according to claim 1.
12. A semiconductor integrated circuit, comprising:
a driver that drives a light emitting element;
a regulator that supplyes a power source voltage;
a level shifter that shifts a level of image data; and
a control circuit that controls an operation of at least one of the driver and the regulator,
the semiconductor integrated circuit operating an electro-optical element.
13. A power source system interface comprising the semiconductor integrated circuit according to claim 12.
14. An electronic apparatus comprising the semiconductor integrated circuit according to claim 12.