Adaptive Deceleration Mapping for Aircraft Brake Control

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Solution Overview

Problem

Conventional aircraft deceleration command braking systems fail to accurately apply braking force during landing due to ambient deceleration, leading to a 'lag' in braking response, which can be misleading for pilots and potentially unsafe.

Innovation Solution

An adaptive deceleration system that uses the aircraft's ambient deceleration as a baseline to determine the desired deceleration, allowing the braking system to apply force sooner by mapping pedal deflection to a desired deceleration greater than the present level, eliminating the need for significant pedal deflection before braking engages.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional deceleration command braking with static mapping is used, then the braking system commands force only when pedal deflection exceeds ambient deceleration, but this causes a lag in braking response and requires significant pedal deflection (up to 40%) before braking activates

Engineering Contradiction:

Improvebraking response accuracyVSAvoidbraking activation delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies dynamics by transitioning from a static mapping of pedal deflection to target deceleration to a dynamic adaptive mapping that responds to real-time ambient deceleration conditions. The brake system controller continuously monitors ambient deceleration and adjusts the mapping relationship between pedal deflection and braking force accordingly, enabling the system to adapt its response characteristics based on current flight conditions.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter mapping relationship between pedal deflection and target deceleration based on ambient deceleration levels. Instead of using a fixed static mapping, the system dynamically adjusts this parameter relationship so that the desired deceleration is always greater than the present deceleration, ensuring immediate braking response regardless of existing deceleration from reverse thrust, air resistance, or other factors.

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If static mapping of pedal deflection to target deceleration is used, then the system structure remains simple, but the pilot control accuracy deteriorates when ambient deceleration is present

Engineering Contradiction:

Improvebrake control system structureVSAvoidpedal control accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent implements feedback by having the brake system controller continuously monitor ambient deceleration and use this information to adjust the desired deceleration target. The controller receives feedback about the current deceleration state from sensors and uses this feedback to dynamically adjust the mapping between pedal deflection and target deceleration, thereby maintaining pilot control accuracy across varying flight conditions without requiring complex manual adjustments.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS8423256B2Systems and methods for adaptive deceleration

Publication Date: 2013.04.16 GOODRICH CORP

AI summary

Systems and methods for adaptive deceleration are disclosed. A brake system controller may perform a method comprising receiving a pedal deflection signal comprising a pedal deflection level, determining a present level of deceleration, and mapping the pedal deflection level to a desired level of deceleration, wherein the desired level of deceleration is greater than the present level of deceleration.