Aircraft Wheel Braking Control for Smooth Thrust Reverser Deceleration
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Solution Overview
Problem
The existing aircraft braking systems experience jerks during landing due to the independent operation of wheel brakes and thrust reversers, leading to reduced passenger comfort and performance, as the wheel braking system struggles to adapt to the sudden deceleration caused by thrust reverser deployment.
Innovation Solution
A method where the wheel braking controller receives and acts upon both deceleration regulation requests and thrust reverser deployment requests, allowing for real-time adaptation of the deceleration setpoint or gain adjustments based on the actual status of the thrust reversers to smooth out deceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the wheel braking system operates independently without receiving thrust reverser deployment requests, then the device complexity is reduced, but the deceleration smoothness and passenger comfort deteriorate due to jerks caused by sudden thrust reverser deployment
Solution Approach 1:
The patent merges the wheel braking controller with thrust reverser controller by having the wheel braking controller receive and process both deceleration regulation requests and thrust reverser deployment requests. This integration allows the braking system to anticipate and compensate for thrust reverser deployment, smoothing out deceleration transitions and eliminating jerks that would otherwise occur when the systems operate independently.
2Object-affected harmful factors
If the wheel braking controller receives both deceleration regulation requests and thrust reverser deployment requests, then the deceleration smoothness is improved, but the device complexity increases
Solution Approach 1:
The wheel braking controller is designed with multi-functionality, serving both as a braking control device and a thrust reverser coordination device. By universally handling both deceleration regulation requests and thrust reverser deployment requests within a single controller, the patent avoids the need for separate dedicated controllers, thereby managing complexity while achieving smooth deceleration control.
3Measurement precision
If a very dynamic corrector is used to eliminate thrust reverser deployment disturbances, then the deceleration regulation accuracy is improved, but the passenger comfort deteriorates due to over-correction and additional jerks
Solution Approach 1:
The patent applies preliminary action by having the wheel braking controller receive the thrust reverser deployment request in advance and adjust the deceleration setpoint before the actual thrust reverser deployment occurs. This proactive adjustment prevents the sudden disturbance from happening, thereby maintaining both high deceleration accuracy and passenger comfort without needing aggressive over-correction.
Solution Approach 2:
The system applies preliminary anti-action by counteracting the expected disturbance from thrust reverser deployment through advance adjustment of the deceleration setpoint. The controller calculates and applies an opposing correction based on the anticipated thrust reverser effect, neutralizing the disturbance before it manifests as a jerk, thus maintaining both accuracy and comfort.
Data Source
AI summary
Method for monitoring the braking of the wheels of an aircraft in which the braking of the wheels of the aircraft is controlled by a wheel braking controller actuating the wheel brakes of the aircraft based on both a deceleration regulation request and a thrust reverser deployment request.