Proportional-integral circuit having means for change-over betwe

Details Proportional-integral circuit having means for change-over betwe Proportional-integral circuit having means for change-over betwe

1974-09-03

1976-03-02

Schaefer, Robert K.

Electricity: motive power systems

Positional servo systems

Multiple mode systems

318609, G05B 700

Patent

active

039420884

ABSTRACT:
A proportional-integral circuit comprising a proportional element, an integrator and an adder. In an automatic mode, the proportional element delivers an output signal V.sub.P which is proportional to an input signal V.sub.i, the integrator delivers an output signal V.sub.I by integrating the input signal V.sub.i, and the adder delivers an output signal V.sub.PI which is the sum of the output V.sub.P of the proportional element and the output V.sub.I of the integrator. In a handling mode, the input signal V.sub.i is not applied to the integrator, and the output V.sub.P of the proportional element and an output V.sub.H of a manual handling source are applied to the integrator. A resistor is connected in parallel with a feedback capacitor in the integrator so that the integrator possesses an adding function. The adder adds up the output V.sub.P of the proportional element and the output V.sub.I of the integrator. Further, in this circuit, the gain of the integrator output V.sub.I relative to V.sub.P and V.sub.H is selected to be l
, and the gain of the adder output V.sub.PI relative to V.sub.I is selected to be n.

REFERENCES:
patent: 3523193 (1970-08-01), Hutcheon
patent: 3576535 (1971-04-01), Turner
patent: 3662276 (1972-05-01), Hyer
patent: 3725762 (1973-04-01), Levesque
patent: 3772602 (1973-11-01), Kobayashi
patent: 3826991 (1974-07-01), Hogan
patent: 3882368 (1975-05-01), Carleton

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