Method and apparatus for implementing a databus voter to select flight command signals from one of several redundant asynchronous digital primary flight computers
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United States of America Patent
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May 7, 1996
Grant Date -
N/A
app pub date -
Apr 25, 1994
filing date -
Apr 25, 1994
priority date (Note) -
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Abstract
Asynchronous, triple redundant primary flight computers (PFC's) (12, 14, 16) produce output command signals carried over a data bus (18) to control redundant actuators (32, 34, 36) in an aircraft flight control system. To prevent the transmission of a fault and a force fight among the redundant actuators, which drive a common aircraft control surface (50), a databus voter (52, 54, 56) associated with each PFC receives all PFC commands and, in accordance with a selection algorithm, outputs a voted one of the PFC command signals. A databus voter monitor, (144) associated with each databus voter, deactivates its associated databus voter if it detects a voted command signal which is inconsistent with the selection algorithm.
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