Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
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.
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patent: 4683538 (1987-07-01), Guichard
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patent: 4832415 (1989-05-01), Shinomiya
patent: 5015042 (1991-05-01), Yoshino
Wang Jiunn Y.
Yeh Edge C.
Muratori Alfred
National Science Council
Oberleitner Robert J.
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