Degraded actuator detection
First Claim
1. A method of detecting a degraded actuator comprising the steps of:
- a) commanding an actuator to a desired actuator position;
b) detecting an actual actuator position of the actuator;
c) comparing the desired and actual actuator positions to determine if the actual actuator position exceeds a fault detection accommodation limit;
d) comparing the desired and actual actuator positions to determine if the actual actuator position is within a band that is different than the fault detection accommodation limit;
e) calculating a threshold at a regular interval based upon an estimated load on the actuator;
f) applying the threshold to adjust the band; and
g) determining if the actual actuator position is within the adjusted band.
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Accused Products
Abstract
An actuator control system is disclosed that includes an actuator continuously movable between multiple positions. The controller is configured to command the actuator to a desired actuator position and to apply the command to an actuator model. The controller is configured to compare the modeled and actual actuator positions to determine if the position difference exceeds a fault detection accommodation limit and if the position difference is within a band that is different than the fault detection accommodation limit. The controller is configured to calculate a threshold, which is based upon an estimated load on the actuator. The controller is configured to calculate a band comprised of the threshold applied to the modeled position and to determine if the actual actuator position is within the calculated band. The threshold is calculated at regular intervals, and a fault is declared if the actual actuator position is outside the band for a number of consecutive intervals.
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Citations
17 Claims
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1. A method of detecting a degraded actuator comprising the steps of:
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a) commanding an actuator to a desired actuator position; b) detecting an actual actuator position of the actuator; c) comparing the desired and actual actuator positions to determine if the actual actuator position exceeds a fault detection accommodation limit; d) comparing the desired and actual actuator positions to determine if the actual actuator position is within a band that is different than the fault detection accommodation limit; e) calculating a threshold at a regular interval based upon an estimated load on the actuator; f) applying the threshold to adjust the band; and g) determining if the actual actuator position is within the adjusted band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An actuator control system comprising:
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an actuator movable between multiple positions; a position sensor configured to detect the multiple positions, which includes an actual actuator position; a controller in communication with the actuator and the position sensor, the controller configured to command the actuator to a desired actuator position, wherein the controller is configured to compare the desired and actual actuator positions to determine if the actual actuator position exceeds a fault detection accommodation limit and if the actual actuator position is within a band that is different than the fault detection accommodation limit, wherein the controller is configured to calculate a threshold if the actual actuator position is within the band, the calculation based upon an actuator load on the actuator, and wherein the controller is configured to apply the threshold to adjust the band and determine if the actual actuator position is within the adjusted band.
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Specification