Method for monitoring a no-back device of an adjustable horizontal trim actuator, corresponding system and aircraft
First Claim
1. A method for monitoring an actuator equipped with a no-back device, comprising:
- detecting reversal of a direction of movement of the actuator;
storing in memory, when reversal of the direction of movement of the actuator is detected, a current angular position as a reference angular position of the actuator;
determining a value representative of mechanical work produced by the actuator;
comparing the value representative of the mechanical work produced with ranges of values; and
detecting dysfunctioning of the no-back device by the comparing,wherein detection of dysfunctioning is temporarily inhibited upon detecting reversal of the direction of movement of the actuator and as long as the angular displacement of the actuator remains within free play of the no-back device, andwherein a subsequent current angular position is compared with the reference angular position stored in the memory to determine when the angular displacement of the actuator remains within the free play of the no-back device.
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Accused Products
Abstract
A method and a system for monitoring an actuator equipped with a no-back device or no-back brake, particularly an adjustable horizontal trim actuator provided in aircraft, the method including the steps of: determining a value representative of mechanical work produced by the actuator and comparing the determined value with ranges of values so as to detect a dysfunctioning of the said no-back device. If the actuator is a screw/nut type with a hydraulic motor, the value representative of the mechanical work is determined from an algebraic velocity of the motor and an algebraic differential of hydraulic pressure at terminals of the motor. A negative value corresponding to negative mechanical work then identifies a failure of the no-back device.
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Citations
17 Claims
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1. A method for monitoring an actuator equipped with a no-back device, comprising:
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detecting reversal of a direction of movement of the actuator; storing in memory, when reversal of the direction of movement of the actuator is detected, a current angular position as a reference angular position of the actuator; determining a value representative of mechanical work produced by the actuator; comparing the value representative of the mechanical work produced with ranges of values; and detecting dysfunctioning of the no-back device by the comparing, wherein detection of dysfunctioning is temporarily inhibited upon detecting reversal of the direction of movement of the actuator and as long as the angular displacement of the actuator remains within free play of the no-back device, and wherein a subsequent current angular position is compared with the reference angular position stored in the memory to determine when the angular displacement of the actuator remains within the free play of the no-back device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 17)
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8. A system for monitoring an actuator equipped with a no-back device, comprising:
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a reversal detecting module to determine reversal of a direction of movement of the actuator; memory to store an angular position of the actuator, the memory storing a current angular position as a reference angular position of the actuator when reversal of the direction of movement of the actuator is detected; a determination module to determine a value representative of mechanical work produced by the actuator; a comparison module to detect dysfunctioning of the no-back device by comparing the value representative of the mechanical work produced with ranges of values; and a monitoring module to temporarily inhibit detection of dysfunctioning as a function of a parameter relating to reversal of the direction of movement of the actuator within free play of the no-back device, wherein a subsequent current angular position is compared with the reference angular position stored in the memory to determine when angular displacement of the actuator is greater than the free play of the no-back device. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A method for monitoring an actuator equipped with a no-back device, comprising:
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determining a value representative of mechanical work produced by the actuator; comparing the value representative of the mechanical work produced with ranges of values; detecting dysfunctioning of the no-back device by the comparing; and detecting a rate of deceleration of the actuator, wherein detection of dysfunctioning is temporarily inhibited upon detecting the rate of deceleration of the actuator having an amplitude of which is greater than a threshold amplitude and as long as the amplitude remains greater than the threshold amplitude.
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Specification