G - Physics – 05 – D
Patent
G - Physics
05
D
341/97
G05D 3/00 (2006.01) G05B 11/42 (2006.01) H02P 23/00 (2006.01)
Patent
CA 1044785
AUTOMATIC CONTROL SYSTEM Abstract of the Disclosure An automatic control system wherein repetitive pulses, the frequency of which is responsive to a remote con- dition such as prime mover RPM, are converted to a D.C. volt- age level which is then compared to a reference to produce an error signal. The three further signals are then produced, one proportional to the error signal, one proportional to its integral and the other proportional to its derivative. The three further signals are summed and amplified to the extent necessary and the resultant used to control an element which in turn controls the remote condition. Included is a fail safe circuit effective to cause the remote condition control- ling element to shut off in the event incoming pulses are not present. Provision is made whereby the system may respond to the summed signals described above or an external signal which may be derived from a function generator or a limiting value established by an external condition. A particular ap- plication described for the system is its use as a governor system for prime movers such as internal combustion engines and steam turbines.
235566
Barrett William J.
Meyers Elwood J.
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