Boots – shoes – and leggings
Patent
1995-07-03
1998-05-26
Elmore, Reba I.
Boots, shoes, and leggings
39518208, 30312205, 30312208, 30312207, 235440, 235441, 235446, G05B 1500, G05B 1918
Patent
active
057576416
ABSTRACT:
A triplex control system provides automatic compensation for a sensor bias failure in one channel while continuing to process all sensor readout signals. The triplex control system includes first through third non-linear feedback channel processors, each being coupled to a respective sensor to receive a readout signal therefrom. Each channel processor comprises a control algorithm module and feedback loop correction circuit coupled together so as to generate a channel output signal in correspondence with a channel control algorithm and a feedback loop correction signal. The respective channel feedback loop correction signal is generated by the feedback loop correction circuit to provide sensor failure compensation; the feedback signal has a bias sense and magnitude that serves to correct the channel output signal so as to drive it towards the average of the channel control signals from each of the channel processors. Each feedback loop correction circuit comprises a residual signal generator that receives the sensor readout signal from each respective sensor and is adapted to generate a signal to provide the bias sense to the feedback loop correction circuit. The control system additionally has an controller output selection module for providing an control system output signal in correspondence with a selected function, such as an average or median value of the respective channel output signals.
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NASA Technical Paper 2740, Walter C. Merrill et al., Advanced Detection, Isolation, and Accommodation of Sensor Failures--Real-Time Evaluation, Jul. 1987.
NASA Technical Paper 2836, Walter C. Merrill et al., Advanced Detection, Isolation, and Accommodation of Sensor Failures, Nov. 1988.
Elmore Reba I.
General Electric Company
Ingraham Donald S.
Marc McDieunel
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