Process control system

Details Process control system Process control system

1981-04-30

1983-09-13

Nusbaum, Mark E.

Boots, shoes, and leggings

364140, 364153, 415 15, G05B 1500, F01D 1702

Patent

active

044046375

ABSTRACT:
A variable limit is utilized to prevent a position controller which requires a velocity set point signal from overdriving a stuck control valve. Control based on a comparison of the actual position to desired position is utilized unless the valve is stuck. If the valve is stuck, the variable limit controls the velocity set point provided to the position controller until such time as the valve becomes unstuck.

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patent: 4344128 (1982-08-01), Frye
patent: 4360882 (1982-11-01), Stewart et al.

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