Aircraft brake control system
AssigneeAirbus Operations GmbH
InventorsAlexander Hayes, Ashley Bidmead, Andrew Hebborn
Life of this patent
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Abstract
An aircraft brake control system for controlling antiskid braking of an aircraft wheel is disclosed including a control assembly having a mode controller which sets the mode of operation of an antiskid brake calculator, configured to set a first mode, when an input of the indication of a brake energy supply configuration indicates a first brake energy supply being used, in which the antiskid brake calculator applies a first restriction level on a rise rate of the antiskid brake command, and a second mode, when the input 305 indicates a second brake energy supply being used, in which the antiskid brake calculator applies a second, lower, restriction level on a rise rate of the antiskid brake command.
Claims20
An aircraft brake control system for controlling antiskid braking of a wheel of an aircraft, the system comprising a control assembly having:
- i) an input of an indication of an aircraft speed,
- ii) an input of an indication of a wheel speed of the wheel,
- iii) an input of an indication of a brake level,
- iv) an input of an indication of a brake energy supply configuration,
- v) an optimum slip ratio calculator for calculating an optimum slip ratio of the wheel, based at least partly on the indications of the wheel speed and the aircraft speed,
- vi) a state determinator for determining a state of the wheel, including:
- a “small skid” state where it is determined that the slip ratio of the wheel is lower than a slip limit above the optimum slip ratio,
- vii) an antiskid brake calculator, for calculating an antiskid brake command based on the wheel speed, brake level and the determined state,
- viii) a state mode controller which sets a mode of operation of the state determinator, the state mode controller configured to set:
- a first state determinator mode, when the input of the indication of a brake energy supply configuration indicates a first brake energy supply being used, and in which a first slip limit value is used as the slip limit, and
- a second state determinator mode, when the input of the indication of a brake energy supply configuration indicates a second brake energy supply being used, in which a second slip limit value is used as the slip limit, the second slip limit value being lower than the first slip limit value, and
- iv) an output for indicating the antiskid brake command to be sent to a brake valve.
A method of braking an aircraft comprising the steps of:
- at a first time:
- noting that a first brake energy supply is being used, and
- assessing if a wheel is in a “small skid” state by applying a first slip limit to the wheel,
- and, at a second time:
- noting that a second brake energy supply is being used, and
- assessing if a wheel is in a “small skid” state by applying a second slip limit to the wheel, the second slip limit being lower than the first slip limit.
An aircraft brake control system for controlling antiskid braking of a wheel of an aircraft, the system comprising a control assembly having:
- i) an input of an indication of the wheel speed of the wheel,
- ii) an input of an indication of a brake level,
- iii) an antiskid brake calculator, for calculating an antiskid brake command based on the wheel speed and brake level, wherein the antiskid brake calculator is configured to apply a specified minimum command level to the antiskid brake command, wherein the antiskid brake calculator comprises an antiskid filter connected to receive a speed error and output an antiskid command, and
- iv) an output for indicating the antiskid brake command to be sent to a brake valve.
An aircraft brake control system for controlling antiskid braking of a wheel of an aircraft, the system comprising a control assembly having:
- i) an input of an indication of the wheel speed of the wheel,
- ii) an input of an indication of a brake level,
- iii) an antiskid brake calculator, for calculating an antiskid brake command based on the wheel speed and brake level, wherein the antiskid brake calculator is configured to apply a specified minimum command level to the antiskid brake command,
- iv) an output for indicating the antiskid brake command to be sent to a brake valve, and
- v) a state determinator for determining a state of the wheel.
Dependencies are inferred from the claim text.