Electricity: motive power systems – Positional servo systems – Multiple mode systems
Patent
1979-11-07
1982-06-01
Truhe, J. V.
Electricity: motive power systems
Positional servo systems
Multiple mode systems
G05B 700
Patent
active
043330436
ABSTRACT:
Improvement in an electrical control circuit for controlling a D.C. solenoid having a plunger and a manual control potentiometer, a feedback potentiometer and a comparator for comparing the signal voltages from the potentiometers so that the movement of the plunger of the solenoid is proportional to the movement of the wiper of the manual potentiometer, the feedback potentiometer being controlled by the movement of the plunger of the solenoid, feeding the output signal from the feedback potentiometer to the comparator, the improvement comprising providing a digital computer control for the solenoid alternately with the manual control, the computer control capable of receiving binary digital input signals and converting them to analog variable signal voltages, switching between one or the other of the manual and computer controls so that the output signal from either one thereof is fed to the comparator for comparison with the signal from the feedback potentiometer, isolating in each of the two controls between ground and a fixed D.C. voltage source the respective output signals so that the voltage swings thereof are comparable to each other, setting the wiper arm of the manual potentiometer at a given percentage of its travel while adjusting the input signal to the comparator from the manual control at a predetermined value, adjusting the travel position of the plunger of the solenoid and holding it at the given percentage of its travel when the input signal to the comparator is at the predetermined value, and using the predetermined input signal to the comparator for calibrating the computer control against the manual control.
REFERENCES:
patent: 3322994 (1967-05-01), Dever et al.
patent: 3549976 (1970-12-01), De Bretagne
patent: 3984665 (1976-10-01), Shriver et al.
Almo Manifold & Tool Co.
Fisher William L.
Indyk Eugene S.
Truhe J. V.
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