| 摘要 |
<p>Method and apparatus to facilitate the operation of two servoactuators (42, 44) with a tw%ne (2/1) fail operational capability. In preferred embodiments, four signal processing channels (72, 74, 76, 78) are provided, two of which are active and directly control hydraulic servovalves ("A", "B") which in tum control the rate of operation of the servoactuators (42, 44). Two other modeling channels (100, 102) 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 (96, 98) and the two modeled rate indicative outputs (104, 106) 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 tw%ne (2/1) fail operational servoactuator is provided. </p> |
