Wheel and brake advisory system for aircraft

Details Wheel and brake advisory system for aircraft Wheel and brake advisory system for aircraft

1976-09-27

1978-09-19

Yusko, Donald J.

Communications: electrical

Selective

Having indication or alarm

303 92, 303 96, 328132, 340 52B, B08B 2100, B60T 1722

Patent

active

041157567

ABSTRACT:
A wheel speed transducer, for each braked wheel of an aircraft, produces a DC voltage signal which is proportional to the wheel rpm. In one aspect, the system compares the wheel speed voltage signal with a fixed threshold voltage signal proportional to a selected wheel rpm which is indicative of a selected threshold ground speed such as 15 knots. When the threshold ground speed is reached, the system indicator advises that each wheel is or is not rolling at that speed. Another aspect of this system functions immediately after lift-off. The wheel speed voltage signal is compared with a modified wheel speed reference signal, which is maintained at a slightly lower voltage level for normal deceleration and which has a limited maximum rate of decrease determined electronically. Immediately after lift-off if a wheel deceleration rate is abnormally fast, the decreasing wheel speed signal will go negative relative to the decreasing reference signal, thereby producing a triggering signal to energize the system indicator device in the control cabin. An independent control circuit is provided for each of the braked wheels.

REFERENCES:
patent: 3608979 (1971-09-01), Coyle
patent: 3822921 (1974-07-01), Jones
patent: 3944288 (1976-03-01), Bertolasi
patent: 3951467 (1976-04-01), Fleagle
patent: 4005910 (1977-02-01), Leiber

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