Two degree of freedom controller

Electricity: motive power systems – Positional servo systems – 'reset' systems

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318609, 318632, 318621, 364151, G05B 500, G05B 1142

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active

051051389

ABSTRACT:
A two degree of freedom PID controller which includes a setpoint filter for performing a derivative operation on a process disturbance signal in accordance with a setpoint value and a control value of a controlled system, thereby outputting a setpoint signal, a PI-control operation device for determining a deviation between the setpoint signal and the control value, and performing a PI-control operation on the deviation, thereby outputting a manipulative signal, and an adder for adding the process disturbance signal to the manipulative signal output by the PI-control operation device, thus obtaining a sum signal, and for supplying the sum signal to the controlled system.

REFERENCES:
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patent: 4563735 (1986-01-01), Hiroi et al.
patent: 4641235 (1987-02-01), Shigemasa et al.
patent: 4675804 (1987-06-01), Wiemer
patent: 4714988 (1987-12-01), Hiroi et al.
patent: 4755924 (1988-07-01), Hiroi
patent: 4874999 (1989-10-01), Kuwabara et al.
patent: 4953076 (1990-08-01), Yamamoto
patent: 4959767 (1990-09-01), Buchner et al.
ISA, 1986, Paper No. 86-2708 "Two Degrees of Freedom Algorithm" pp. 789-796, K. Hiroi et al.

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