High resolution control system for a pressure-responsive positio

Details High resolution control system for a pressure-responsive positio High resolution control system for a pressure-responsive positio

1985-02-15

1986-05-13

Richter, Sheldon J.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Electrical input and feedback signal means

91361, 318632, F15B 903, F15B 1316

Patent

active

045878838

ABSTRACT:
Two magnetic valves, one of which reduces the pressure and the other one of which increases the pressure by which the displacement of a positioning member is controlled, only one of them operated at a time in accordance to the sign of the error signal, are operated in a pulsed mode with variable pulse width when the error signal is within a range of low absolute value and in a continuous mode of operation when the error signal has a higher absolute value. Variation of the magnitude of the error signal within the intermittent valve operation range controls pulse width variation. Hysteresis is provided in a transition between operating modes of a valve by a time delay of the mode change after the error signal has risen or fallen past a threshold value of signal. High displacement resolution is obtained as well as independence from effect of temperature drifts and magnetic valve characteristics.

REFERENCES:
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patent: 4074177 (1978-02-01), Olig
patent: 4286318 (1981-08-01), Immink et al.
patent: 4294162 (1981-10-01), Fowler et al.

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