Aircraft Wheel Traction Control via Brake Torque Adjustment
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Solution Overview
Problem
Aircraft lack effective traction control systems for autonomous ground travel under various weather and surface conditions without relying on brakes or ground surface limitations, as existing systems are primarily designed for automotive applications and do not address the unique challenges of aircraft ground movement.
Innovation Solution
A traction control system equipped with onboard wheel drive means that automatically translates torque through aircraft wheels, using sensors and processors to detect wheel slippage and adjust torque to maintain efficient and autonomous ground travel, independent of aircraft brakes and surface conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If automotive traction control systems are applied to aircraft, then automatic wheel slippage detection is achieved, but the system lacks adaptability to aircraft-specific ground movement conditions
Solution Approach 1:
The system modifies the operational parameters of the aircraft's existing brake system to achieve traction control. By dynamically adjusting brake application force and duration based on wheel slippage detection, the system adapts automotive-style automatic control to aircraft-specific conditions without requiring a completely new control architecture.
Solution Approach 2:
The brake system is made multi-functional by enabling it to perform both its traditional stopping function and the new traction control function. The same brake actuators and control mechanisms are used for both decelerating the aircraft and preventing wheel slippage during ground movement, eliminating the need for separate dedicated traction control hardware.
2Reliability
If brake force is applied to control wheel slippage, then traction is improved, but energy loss increases and braking effectiveness is reduced for actual stopping
Solution Approach 1:
The brake system operates in periodic pulses rather than continuous application. The control system detects wheel slippage and applies brake force in short, repeated cycles just enough to prevent slippage, then releases the brakes. This periodic operation minimizes energy loss while maintaining traction control effectiveness.
Solution Approach 2:
The system applies only the minimum necessary brake force required to prevent wheel slippage, rather than full braking power. By using partial action (just enough brake force to maintain traction), the system achieves reliable traction control while minimizing energy loss and preserving braking capacity for actual stopping requirements.
3Reliability
If engine power is reduced to control slippage, then wheel rotation speed is decreased, but acceleration performance is compromised
Solution Approach 1:
The system replaces engine power reduction (a mechanical/throttle control approach) with direct mechanical brake intervention. Instead of reducing the driving force from the engines, the system applies counteracting brake force directly to the slipping wheels, allowing engines to maintain full power output while still achieving slippage control.
4Measurement precision
If multiple sensors are employed for electronic control, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system uses the aircraft's existing wheel speed sensors and brake control infrastructure to perform traction control, rather than adding entirely new sensing and control systems. The existing sensors continue to serve their primary function while also enabling slippage detection, and the brake system serves both stopping and traction control functions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables reliable and efficient aircraft ground travel by automatically controlling traction, adapting to different environmental conditions, and preventing wheel slippage, thereby improving acceleration performance and driving stability.
Implementation Method 1
Traction of a vehicle is established as its wheels contact a surface so that when the wheels are rotated, usually by a driving force, the vehicle will be moved along the surface in a desired direction. The combination of the coefficient of friction and the force exerted by a wheel against the surface produces traction.
Data Source
AI summary
A traction control system and method are provided for an aircraft equipped with a ground travel drive system with drive wheels powered by onboard wheel drive means that are capable of translating torque through the aircraft drive wheels and that are automatically controllable to control traction without reliance on the aircraft's brakes to keep the aircraft moving efficiently and autonomously on the ground under a range of environmental conditions.