Method and system for controlling a differential dosing scale

Details Method and system for controlling a differential dosing scale Method and system for controlling a differential dosing scale

1988-05-10

1990-12-11

Teska, Kevin J.

Boots, shoes, and leggings

364579, 36457101, 364162, G01G 1300, G05B 1302

Patent

active

049775260

ABSTRACT:
In a method and system for controlling a differential dosing scale having a weighing device and a control for the delivery rate especially of loose bulk material achieved by comparison of rated and actual weight values, measures are taken to eliminate the effects of disturbances of the output signal of the weighing device. Improvements are achieved in that an estimated or predicted value (G) for the next measured weight value is derived from previously measured values (G.sub.i) of the output signal (G) of the weighing device. The predicted value (G) is compared with the next actual measured value (G.sub.i) to determine a difference. If this difference exceeds a prescribed tolerance range or value, the control of the delivery rate continues at the unchanged previous actual value (P) of the delivery rate. Thus, the effects of disturbances are greatly reduced or even completely eliminated. Changes in the rated value of the delivery rate can also be taken into account. A differential dosing scale for carrying out the method includes appropriate hardware components or software for achieving the described control.

REFERENCES:
patent: Re30967 (1982-06-01), Ferrara et al.
patent: Re32102 (1986-04-01), Ricciardi et al.
patent: 4275439 (1981-06-01), Kuwata
patent: 4301501 (1981-11-01), Carter et al.
patent: 4320855 (1982-03-01), Ricciardi et al.
patent: 4630189 (1986-12-01), Ohmori et al.
patent: 4639853 (1987-01-01), Rake et al.
patent: 4719561 (1988-01-01), Shigemasa
patent: 4775949 (1988-10-01), Kalata
Control Engineering Jun. 1984, "Self-Tuning PID Controller Uses Pattern Recognition Approach", TW Kraus et al., pp. 106-111.

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