US 2010/0072934 A1 · FAULT-TOLERANT CONTROL SYSTEM

Abstract

A fault-tolerant position feedback filter may be used in an actuation control system to limit the authority of a first position signal, should the first position signal become erroneous, and thereby prevent a postulated runaway condition of an acuator. The filter includes a difference function, a limited integrator, and a summer The difference function is coupled to receive a first position signal and a combined position error signal and is operable to supply a first position error signal representative of a mathematical difference between the first position signal and the combined position signal. The limited integrator is coupled to receive the first position error signal and operable to supply an integrated position error signal that is limited in magnitude to a predetermined limit. The summer is coupled to receive the integrated position error signal and a second position signal and is operable to supply the combined position error signal. The combined position error signal is representative of a mathematical sum of the integrated position error signal and the second position signal.

Claims20

Dependent claims

A fault-tolerant servomechanism control, comprising:

a position control coupled to receive position commands and combined position feedback signals and operable, in response thereto, to supply commands;
and
a combined position feedback filter coupled to receive a first position feedback signal and a second position feedback signal and operable, in response thereto, to supply the combined position feedback signals to the position control, the combined position feedback filter comprising:
a difference function coupled to receive the first position feedback signals and the combined position feedback signals and operable to supply first position error signals representative of a mathematical difference between the first position feedback signals and the combined position feedback signals,
a limited integrator coupled to receive the first position error signals and operable to supply integrated position error signals that are limited in magnitude to a predetermined limit, and
a summer coupled to receive the integrated error signals and the second position feedback signals and operable to supply the combined position feedback signals, the combined position feedback signals representative of a mathematical sum of the integrated error signals and the second position feedback signals.

3 more elements

A fault-tolerant actuator control system, comprising:

an actuator assembly coupled to receive control signals;
an actuator controller coupled to receive at least position commands and combined position feedback signals and operable, in response thereto, to supply the actuator control signals to the actuator assembly;
and
a combined position feedback filter coupled to receive first actuator position feedback signals and second actuator position feedback signals and operable, in response thereto, to supply the combined position feedback signals to the actuator controller, the combined position feedback filter comprising:
a difference function coupled to receive the first actuator position feedback signals and the combined position feedback signals and operable to supply first position error signals representative of a mathematical difference between the first actuator position feedback signals and the combined position feedback signals,
a limited integrator coupled to receive the first position error signals and operable to supply integrated position error signals that are limited in magnitude to a predetermined limit, and
a summer coupled to receive the integrated position error signals and the second actuator position feedback signals and operable to supply the combined position feedback signals, the combined position feedback signals representative of a mathematical sum of the integrated position error signals and the second actuator position signals.

4 more elements

Dependencies are inferred from the claim text.

Fault-tolerant control system

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Fault-tolerant control system

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Abstract

Claims20