Predictor algorithm for actuator control
First Claim
1. A control system for an actuator, comprising:
- (a) an actuator feedback control for said actuator including;
(i) means for providing a feedback signal indicative of an output position of said actuator;
(ii) means for comparing an output position demand signal for said actuator with said feedback signal for providing an actuator output position error signal; and
(iii) means for providing to said actuator an input signal proportional to said output position error signal; and
(b) a fault detection system including;
(i) an algorithm for continuously determining a maximum limit and a minimum limit for said actuator output position based on a maximum estimated rate of actuator output and a minimum estimated rate of actuator output; and
(ii) means for comparing said feedback signal to said actuator output position maximum and minimum limits and providing a fault indication upon exceeding the bounds thereof.
1 Assignment
0 Petitions
Accused Products
Abstract
A predictor algorithm for an actuator control is provided in a servo-actuator system. The predictor algorithm receives a signal representative of the torque motor current supplied to the servovalve controlling the actuator and uses that signal to predict the change in actuator position over a single time interval. If the measured actuator position for the previous time interval is within the maximum value and the minimum value for that time interval, then the next maximum and minimum values are calculated by adding the predicted change to the previous measured signal. If the measured actuator signal for the previous time interval is outside the maximum and minimum values for that time interval, then the next maximum and minimum values are calculated by adding the predicted change to the previous maximum and minimum values. A fault is indicated when the measured signal falls outside the maximum and minimum values for a predetermined number of time intervals. In a further embodiment of the present invention, the gain of the torque motor is tracked and used to adjust the maximum and minimum values for various operating conditions.
58 Citations
26 Claims
-
1. A control system for an actuator, comprising:
-
(a) an actuator feedback control for said actuator including; (i) means for providing a feedback signal indicative of an output position of said actuator; (ii) means for comparing an output position demand signal for said actuator with said feedback signal for providing an actuator output position error signal; and (iii) means for providing to said actuator an input signal proportional to said output position error signal; and (b) a fault detection system including; (i) an algorithm for continuously determining a maximum limit and a minimum limit for said actuator output position based on a maximum estimated rate of actuator output and a minimum estimated rate of actuator output; and (ii) means for comparing said feedback signal to said actuator output position maximum and minimum limits and providing a fault indication upon exceeding the bounds thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
-
Specification