Patent US3917356A successfully refreshed from Google Patents.
US3917356A
Expired / Lapsed
US
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Aircraft automatic braking system
Assignee: Boeing Co
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Filing: 1973-09-06
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Granted: 1975-11-04
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Expires: 1993-09-06
Abstract
Abstract An aircraft automatic braking system utilizing the forward wheels of an aircraft landing gear truck for generating signals representative of wheelspeed for utilization in wheelspeed spinup detector circuits in the system while utilizing the rear wheels of the aircraft landing gear truck for generating signals representative of deceleration further compared with selected deceleration to adjust system pressure. To compensate for varying runway conditions, the velocities of a plurality of rear wheels are averaged in providing the signals representative of deceleration.
Inventors
- 👤 Garrett H Devlieg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:06
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/1701; B60T8/1703; B60T8/32; B60T8/321; B60T8/325; B64; B64C; B64C25/00; B64C25/32; B64C25/42; B64C25/426
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
235 words
In combination in an automatic braking control system for an aircraft having automatic braking control valve means; first means for deriving a signal representative of the rate of deceleration of said aircraft; second means for generating a predetermined deceleration command signal; third means for generating an aircraft deceleration overshoot command signal; fourth means for comparing the average wheelspeed of a plurality of wheels of said aircraft with a predetermined wheelspeed spin-up value to provide a wheelspeed spin-up signal; fifth means responsive to a plurality of aircraft operating parameters and said wheelspeed spin-up signal for enabling hydraulic power utilization by said automatic braking control valve means; sixth means comprising deceleration error signal generating and amplitude limiting circuit means for adding said deceleration overshoot command signal and said predetermined deceleration command signal and subtracting from said sum said aircraft deceleration signal to provide an aircraft deceleration error signal representative of the difference between the commanded and actual rates of deceleration; and seventh means comprising deceleration error signal integrating and pressure control signal limiting circuit means responsive to said deceleration error signal for integrating said signal and generating a brake pressure control signal, said seventh means further including maximum and minimum brake pressure control signal limiting circuit means for limiting said brake pressure control signal between predetermined maximum and minimum values; and eight means for coupling said brake pressure control signal to said automatic braking control valve means.
Claim 2
Dependent Claim
235 words
In combination in an automatic braking control system for an aircraft having automatic braking control valve means; first means for deriving a signal representative of the rate of deceleration of said aircraft; second means for generating a predetermined deceleration command signal; third means for generating an aircraft deceleration overshoot command signal; fourth means for comparing the average wheelspeed of a plurality of wheels of said aircraft with a predetermined wheelspeed spin-up value to provide a wheelspeed spin-up signal; fifth means responsive to a plurality of aircraft operating parameters and said wheelspeed spin-up signal for enabling hydraulic power utilization by said automatic braking control valve means; sixth means comprising deceleration error signal generating and amplitude limiting circuit means for adding said deceleration overshoot command signal and said predetermined deceleration command signal and subtracting from said sum said aircraft deceleration signal to provide an aircraft deceleration error signal representative of the difference between the commanded and actual rates of deceleration; and seventh means comprising deceleration error signal integrating and pressure control signal limiting circuit means responsive to said deceleration error signal for integrating said signal and generating a brake pressure control signal, said seventh means further including maximum and minimum brake pressure control signal limiting circuit means for limiting said brake pressure control signal between predetermined maximum and minimum values; and eight means for coupling said brake pressure control signal to said automatic braking control valve means.
Claim 3
Dependent Claim
27 words
The combination according to claim 1 wherein said sixth means further includes means for limiting said deceleration error signal to maximum amplitude level positive and negative polarities.
Claim 4
Dependent Claim
95 words
In combination in an aircraft automatic brake control system: valve means for controlling brake pressure application to a plurality of wheels of said aircraft; system control logic circuit means responsive to wheel spin-up for providing a system logic control signal for actuating said system; means for generating a signal representative of a commanded rate of deceleration. means responsive to said system logic control signal for adding a variable level command signal to said commanded rate signal upon actuation of said system which variable level command signal decays to zero amplitude in a predetermined time period.
Claim 5
Dependent Claim
95 words
In combination in an aircraft automatic brake control system: valve means for controlling brake pressure application to a plurality of wheels of said aircraft; system control logic circuit means responsive to wheel spin-up for providing a system logic control signal for actuating said system; means for generating a signal representative of a commanded rate of deceleration. means responsive to said system logic control signal for adding a variable level command signal to said commanded rate signal upon actuation of said system which variable level command signal decays to zero amplitude in a predetermined time period.
Claim 6
Dependent Claim
172 words
In an aircraft having a plurality of landing gear trucks, each of said trucks including a plurality of forward wheels and a plurality of aft wheels, a wheel brake control system comprising in combination: valve means for controlling brake pressure application to a plurality of said forward wheels and a plurality of said aft wheels on a plurality of said trucks; means responsive to the wheelspeeds of a plurality of said aft wheels on a plurality of said trucks for providing a signal representative of the deceleration rate of said aircraft; means coupled to said valve means and responsive to said signal representative of the deceleration rate of said aircraft for controlling said valve means; and wheelspeed spin-up detector circuit means responsive to the wheelspeeds of a plurality of said forward wheels for enabling said valve means for controlling brake pressure application to said plurality of said forward wheels and a plurality of said Aft wheels on a plurality of said trucks upon the occurence of wheelspeed spin-up to a predetermined value.
Claim 7
Dependent Claim
172 words
In an aircraft having a plurality of landing gear trucks, each of said trucks including a plurality of forward wheels and a plurality of aft wheels, a wheel brake control system comprising in combination: valve means for controlling brake pressure application to a plurality of said forward wheels and a plurality of said aft wheels on a plurality of said trucks; means responsive to the wheelspeeds of a plurality of said aft wheels on a plurality of said trucks for providing a signal representative of the deceleration rate of said aircraft; means coupled to said valve means and responsive to said signal representative of the deceleration rate of said aircraft for controlling said valve means; and wheelspeed spin-up detector circuit means responsive to the wheelspeeds of a plurality of said forward wheels for enabling said valve means for controlling brake pressure application to said plurality of said forward wheels and a plurality of said Aft wheels on a plurality of said trucks upon the occurence of wheelspeed spin-up to a predetermined value.
Claim 8
Dependent Claim
153 words
An aircraft automatic braking system comprising in combination: means for generating a first signal representative of aircraft deceleration; means for providing a second signal representative of a preselected level of deceleration; means responsive to said first and second signals for providing a brake pressure control signal; automatic braking pressurre modulating valve means responsive to said brake pressure control signal for metering automatic braking pressure to a first shuttle valve means for application to the brakes on one side of the aircraft and a second shuttle valve means for application to the brakes on the other side of the aircraft; first manually controlled pressure metering valve means coupled to said first shuttle valve means and second manually controlled pressure metering valve means coupled to said second shuttle valve means, and shutoff valve means for transmitting hydraulic power to said automatic braking pressure modulating valve means in response to a plurality of aircraft operating parameters.
Claim 9
Dependent Claim
153 words
An aircraft automatic braking system comprising in combination: means for generating a first signal representative of aircraft deceleration; means for providing a second signal representative of a preselected level of deceleration; means responsive to said first and second signals for providing a brake pressure control signal; automatic braking pressurre modulating valve means responsive to said brake pressure control signal for metering automatic braking pressure to a first shuttle valve means for application to the brakes on one side of the aircraft and a second shuttle valve means for application to the brakes on the other side of the aircraft; first manually controlled pressure metering valve means coupled to said first shuttle valve means and second manually controlled pressure metering valve means coupled to said second shuttle valve means, and shutoff valve means for transmitting hydraulic power to said automatic braking pressure modulating valve means in response to a plurality of aircraft operating parameters.
Claim 10
Dependent Claim
121 words
In combination in an automatic braking system for an aircraft; means for providing a signal representative of a preselected level of deceleration; means responsive to said signal for providing a brake pressure control signal; automatic braking pressure modulating valve means responsive to a signal representative of the commanded automatic braking pressure for metering automatic braking pressure to a first shuttle valve means for application to the brakes on one side of the aircraft and a second shuttle valve means for application to the brakes on the other side of the aircraft; and, first manually controlled pressure metering valve means coupled to said first shuttle valve means and second manually controlled pressure metering valve means coupled to said second shuttle valve means.
Claim 11
Dependent Claim
121 words
In combination in an automatic braking system for an aircraft; means for providing a signal representative of a preselected level of deceleration; means responsive to said signal for providing a brake pressure control signal; automatic braking pressure modulating valve means responsive to a signal representative of the commanded automatic braking pressure for metering automatic braking pressure to a first shuttle valve means for application to the brakes on one side of the aircraft and a second shuttle valve means for application to the brakes on the other side of the aircraft; and, first manually controlled pressure metering valve means coupled to said first shuttle valve means and second manually controlled pressure metering valve means coupled to said second shuttle valve means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |