Multiple-voting fault detection system for flight critical actua

Details Multiple-voting fault detection system for flight critical actua Multiple-voting fault detection system for flight critical actua

1991-02-01

1993-12-28

Black, Thomas G.

Boots, shoes, and leggings

244 76R, 318564, 371 681, G06F 1116

Patent

active

052745546

ABSTRACT:
A control system includes a dual actuator (2) and primary and secondary controllers (20, 22), each of which has two control channels. In a normal mode of operation, the primary controller (20) controls both valves (32, 38) of the actuator (2). Each primary channel generates a model signal and a monitoring signal corresponding to expected and actual operation of the actuator, respectively. The two signals from each channel are communicated to the other channel. Each channel monitors itself as well as the other channel by comparing model and monitoring signals; and is also similarly redundantly monitored by the other channel of the controller (20). Each channel independently compares its own signals with the signals from the other channel. Each of the two channels has a deactivating switch responsive to a fault status signal from either of the two channels to thereby allow deactivation of a failed channel even when the failure in such channel prevents it from deactivating itself. The channels of the secondary controller (22) are similarly redundantly monitored by themselves and each other. Communication links are maintained between the primary channels, the secondary channels, and between the primary and secondary channels.

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