Fluid-pressure and analogous brake systems – Speed-controlled – Braking pressure demand or braking force desire
Reexamination Certificate
2001-10-09
2003-12-02
Graham, Matthew C. (Department: 3683)
Fluid-pressure and analogous brake systems
Speed-controlled
Braking pressure demand or braking force desire
C303S179000
Reexamination Certificate
active
06655755
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to deceleration control systems for vehicles, and more particularly concerns an adaptive brake application and initial skid detection system for braking of one or more wheels of an aircraft during landing that prevents deep initial skids, and to thus allow rapid brake application in a controlled manner.
2. Description of the Related Art
Anti-skid and automatic braking systems commonly have been provided on commercial and large turbine aircraft to aid the deceleration of the aircraft upon landing. Modern anti-skid systems typically optimize braking efficiency by adapting to runway conditions and other factors affecting braking to maximize deceleration, corresponding to the level of brake pressure selected by the pilot. In conventional antiskid systems, brakes are typically applied mechanically via a metering valve by the pilot, and as soon as the wheel brake pressure approaches the skid level, such as when an initial skid is detected, a brake pressure value is used to initialize the antiskid control system. However, it has been found that the success of this method does can be affected by such factors as the mode of aircraft operation, aircraft weight, tire/runway interfaces, and the like. It would therefore be desirable to provide an adaptive brake application system that can adjust brake pressure or torque application to account for such factors.
Furthermore, rapid pedal application by an aircraft pilot also can often create deep initial skids before an effective antiskidding brake pressure or brake torque is determined and skidding is effectively controlled by conventional antiskid and brake control systems. Eliminating or reducing initial skids would result in shorter aircraft stopping distances, which allow the aircraft to land on shorter runways, and can result in reduced tire wear. It would thus be desirable to provide an initial skid detection system to automatically anticipate initial skid conditions and adjust to prevent deep initial skids, to allow the pilot to depress the brake pedals at any rate, while still providing for rapid brake application in a controlled manner. The present invention provides an adaptive brake application and initial skid detection system that meets these needs.
SUMMARY OF THE INVENTION
Briefly, and in general terms, the present invention provides for an adaptive brake application and initial skid detection system that allows rapid brake application, while preventing deep initial skids, by implementation of a skid anticipation system that is initialized as soon as a wheel approaches a skid level to reduce brake application pressure or torque and to apply brakes in a controlled manner.
The invention accordingly provides for a “smart” brake application and initial skid detection system for braking of a wheel of an aircraft during landing. The system is applicable to one or more wheels having a wheel brake for applying brake torque to the wheel. A brake pressure sensor generates brake pressure signals that are a function of the braking pressure applied to the wheel brake, and the brake pressure signals are compared with a predetermined threshold brake pressure. A wheel speed transducer produces wheel speed signals that are a function of the rotational speed of the wheel, and a wheel velocity signal is generated based upon the wheel speed signals. The wheel velocity is compared with a reference velocity signal for generating wheel velocity error signals indicative of the difference between the aircraft wheel velocity signals and the reference velocity signal. A pressure bias modulator integrator is also provided that is responsive to brake pressure signals for adjusting the wheel velocity error signals to provide an anti-skid control signal, and in one currently preferred embodiment the pressure bias modulator integrator is initialized with the predetermined threshold brake pressure plus a predetermined constant pressure value. A command processor generates a command brake pressure signal generated in response to a deceleration command, and brake pressure comparison means are provided for comparing the brake pressure signals with the command brake pressure signal for generating brake pressure difference signals indicative of the difference between the brake pressure signals and the command brake pressure signal. Control means provide an adjusted brake pressure signal to the wheel brake to control the wheel brake independently of operator brake application, in response to the brake pressure difference signals. In another presently preferred embodiment, the pressure bias modulator integrator is initialized to the value of a measured brake pressure when the wheel velocity error signal indicates the beginning of a skid.
In a currently preferred embodiment, means are also provided for adjusting the brake pressure error signals by a proportional pressure gain, an integral pressure gain, and a differential pressure gain. In another presently preferred embodiment, transient control means for providing a proportional control signal and compensation network means, both responsive to the velocity error signal, are also provided, and the outputs of the transient control means and compensation network means are summed with the output of the pressure bias modulator integrator.
From the above, it can be seen that the present invention provides a system and method to initiate brake control after rapid application of the brake pedal, but before the onset of skidding occurs. These and other aspects and advantages of the invention will become apparent from the following detailed description and the accompanying drawings, which illustrate by way of example the features of the invention.
REFERENCES:
patent: 3574417 (1971-04-01), Howard et al.
patent: 3578819 (1971-05-01), Atkins
patent: 3587798 (1971-06-01), Schuman
patent: 3604760 (1971-09-01), Atkins
patent: 3614174 (1971-10-01), Romero
patent: 3682512 (1972-08-01), Malon et al.
patent: 3702714 (1972-11-01), Branson
patent: 3711163 (1973-01-01), Booher
patent: 3724916 (1973-04-01), Hirzel
patent: 3829167 (1974-08-01), Rouf et al.
patent: 3955652 (1976-05-01), Nilsson et al.
patent: 4033630 (1977-07-01), Hubbard
patent: 4043607 (1977-08-01), Signorelli et al.
patent: 4105258 (1978-08-01), Bornfleth
patent: 4313616 (1982-02-01), Howard
patent: 4336592 (1982-06-01), Beck
patent: 4412291 (1983-10-01), Amberg et al.
patent: 4543633 (1985-09-01), Cook
patent: 4768840 (1988-09-01), Sullivan et al.
patent: RE33486 (1990-12-01), Hirzel et al.
patent: 5312168 (1994-05-01), Breen
patent: 5390990 (1995-02-01), Cook
patent: 5403075 (1995-04-01), Fujioka
patent: 5507568 (1996-04-01), Cook et al.
patent: 5605387 (1997-02-01), Cook et al.
patent: 5700072 (1997-12-01), Cook et al.
patent: 6132016 (2000-10-01), Salamat et al.
patent: 6299262 (2001-10-01), Salamat et al.
patent: 42 43 245 (1994-06-01), None
patent: 231829 (1987-08-01), None
patent: 378810 (1990-07-01), None
patent: 386939 (1990-09-01), None
patent: 426959 (1991-05-01), None
patent: 445575 (1991-09-01), None
patent: 575936 (1993-12-01), None
patent: 2637231 (1990-04-01), None
patent: 2 292 195 (1996-02-01), None
US RE30,763, 10/1981, Hirzel et al. (withdrawn)
Motohiro, Igarashi, et al. Digital Brake Control System for Mag-lev Trains, presented at S'Tech '93 (International Conference on Speedup Technology for Railway and MAGLEV Vehicles), Nov. 1993, Yokohama, Japan.
Motohiro, Igarashi, et al. Digital Brake Control System for Mag-lev Trains, presented at S'Tech '93 (International Conference on Speedup Technology for Railway and MAGLEV Vehicles), Nov. 1993, Yokohama, Japan.
Cook Robert D.
Salamat Bijan
Fulwider Patton Lee & Utecht LLP
Graham Matthew C.
Hydro-Aire, Inc.
LandOfFree
System and method for adaptive brake application and initial... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System and method for adaptive brake application and initial..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System and method for adaptive brake application and initial... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3184212