Servo-type phase-locked loop anti-skid brake control system

Details Servo-type phase-locked loop anti-skid brake control system Servo-type phase-locked loop anti-skid brake control system

1991-12-30

1993-01-19

Oberleitner, Robert J.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303110, 36442602, B60T 882

Patent

active

051802147

ABSTRACT:
An anti-skid brake control system (ABS) utilizing a phase-locked loop (PLL) for controlling the brake mechanism of a landing aircraft. The PLL control system tracks the angular velocity of the nose wheel of the aircraft as a reference signal for locking the angular velocity of the main wheel of the aircraft such that the wheel slip is maintained at a constant value. The PLL control system has a phase detector which takes the signals from both wheel speed detectors and is capable of generating accordingly a frequency error signal and a phase error signal. A circuit will generate an electrical signal, the magnitude of the electrical signal being in accordance with the magnitude of the frequency error signal and the magnitude of the phase error signal. A driving member will drive in accordance with the magnitude of the electrical signal the brake mechanism connected to the main wheel to apply a brake force thereto. The main wheel thus braked will cause the aircraft to be decelerated, the deceleration of the aircraft in turn cause the angular speed of the nose wheel and the main wheel to be slowed down. The slowed-down speeds are in turn detected by the wheel detectors and thus forming a feedback loop.

REFERENCES:
patent: 3838889 (1974-10-01), Miller
patent: 4033633 (1977-07-01), Miller et al.
patent: 4040677 (1977-08-01), Bleckmann
patent: 4224568 (1980-09-01), Griner
patent: 4583173 (1986-04-01), Odlen et al.
patent: 4683538 (1987-07-01), Guichard
patent: 4762375 (1988-08-01), Maki et al.
patent: 4832415 (1989-05-01), Shinomiya
patent: 5015042 (1991-05-01), Yoshino

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