Emergency Autoland Braking With Single-Actuator Cable Calibration
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Solution Overview
Problem
Existing emergency autoland braking systems for aircraft require multiple actuators and hydraulic master cylinders, which can complicate system design and are not easily adaptable to aircraft with different design aspects, and do not efficiently utilize brake-by-wire systems.
Innovation Solution
A single actuator mechanism is used to engage aircraft brakes via brake cables, with a rigging calibration mechanism ensuring equal braking pressure to both wheels, and a control system that sends discrete or proportional signals to the actuator based on aircraft data, allowing independent operation from pilot input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple actuators and hydraulic master cylinders are used in existing emergency autoland braking systems, then the braking function can be achieved, but the system design becomes complicated and is not easily adaptable to different aircraft designs
Solution Approach 1:
The patent combines multiple actuators and hydraulic master cylinders into a single integrated actuator mechanism that directly operates brake cables. This single actuator replaces the traditional multi-component setup, reducing system complexity while maintaining the emergency braking function required for autoland operations.
Solution Approach 2:
The single actuator mechanism is designed to be universally adaptable to different aircraft designs. By directly actuating brake cables without aircraft-specific hydraulic infrastructure, the system can be implemented across various aircraft types, enhancing versatility and reducing customization requirements.
2Device complexity
If a single actuator mechanism is used to engage aircraft brakes via brake cables, then system design is simplified and complexity is reduced, but additional mechanisms are needed to ensure equal braking pressure
Solution Approach 1:
The patent introduces a rigging calibration mechanism as an intermediary component between the single actuator and the brake cables. This calibration mechanism ensures equal distribution of braking pressure to both wheels by adjusting cable tension and length, addressing the pressure equalization requirement without returning to complex multi-actuator systems.
3Extent of automation
If the actuator operates independently of rudder pedals, then emergency autoland braking can be activated without pilot input, but the system must ensure no interference with normal pilot operation
Solution Approach 1:
The braking system is segmented into two independent operational paths: the traditional rudder pedal mechanism for normal pilot operation, and the separate single actuator mechanism for automated emergency autoland braking. This segmentation allows both functions to operate independently without interference, enabling autonomous activation while preserving pilot control.
Data Source
AI summary
Emergency autoland systems for aircraft must be able to apply braking to the landing gear wheels on an aircraft during landing. The present disclosure details an emergency autoland braking system and associated apparatus for aircraft. Separate from a pedal brake or a toe brake system that requires input from a pilot or copilot, the aircraft is equipped with a second braking system powered by an actuator that can pull on aircraft brake cables independently of the pedal brakes while still allowing for input from the brake pedals. The actuator may be commanded by the emergency autoland system on board the aircraft. The system provides an equal displacement to both brake cables and is calibrated to slow down the aircraft uniformly.