Electricity: motive power systems – Positional servo systems – With protective or reliability increasing features
Patent
1980-08-05
1982-08-17
Dobeck, B.
Electricity: motive power systems
Positional servo systems
With protective or reliability increasing features
244194, 91 1, 91363A, G05B 1902
Patent
active
043451918
ABSTRACT:
Disclosed is a method of and apparatus to facilitate the operation of two servoactuators with a two/one (2/1) fail operational capability. In preferred embodiments, four signal processing channels are provided, two of which are active and directly control hydraulic servovalves which in turn controls the rate of operation of the servoactuators. Two other modeling channels produce an electrical output similar to the output expected from the servoactuator when supplied with the input to the active channel. The two actual rate indicative outputs and the two modeled rate indicative outputs are compared and deviations in one channel from the other three cause that channel to be declared a "failed" channel. Through a logical switching system, if an active channel has failed, the output of its associated model channel is connected to the servoactuator to continue operation of that actuator. Furthermore, after encountering one failed channel the output and operation of the three remaining channels are also compared with the result that if one of these three remaining outputs differs from the other two, its associated channel is declared as failed as well. Thus, with only two servoactuators, a two/one (2/1) fail operational servoactuator is provided.
REFERENCES:
patent: 3670148 (1972-06-01), Moses
patent: 4130241 (1978-12-01), Meredith et al.
patent: 4159444 (1979-06-01), Bartlett et al.
patent: 4209734 (1980-06-01), Osder
Chenoweth Charles C.
Takats Imre J.
Barnard Delbert J.
Dobeck B.
Heberer Eugene O.
Pauly Joan H.
The Boeing Company
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