Locked Wheel Protection with Paired Brake Pressure Yaw Control
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Solution Overview
Problem
Existing locked wheel protection systems in aircraft braking systems cause significant yaw effects during hydroplaning conditions due to unbalanced brake pressure release, leading to instability during landing or intense braking events.
Innovation Solution
A method and system that reduces brake pressure to zero for a locked wheel and adjusts the brake pressure of its symmetric pair by a predetermined amount, followed by a linear reduction over a set time, to balance braking forces and minimize yaw effects, while monitoring wheel recovery and providing cockpit feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brake pressure is released only on the locked wheel, then the locked wheel protection function is achieved, but significant yaw effects and instability occur
Solution Approach 1:
The system applies asymmetric brake pressure modulation: the locked wheel's brake pressure is released to zero while the paired wheel's brake pressure is reduced by a predetermined amount (40-60%). This asymmetric approach balances the braking forces between paired wheels, preventing yaw effects and maintaining aircraft stability during hydroplaning conditions.
2Stability of the object's composition
If brake pressure is reduced by a predetermined amount on the paired wheel, then yaw effects are reduced, but braking efficiency may be compromised
Solution Approach 1:
The system applies partial action by reducing the paired wheel's brake pressure by a predetermined amount (40-60%) rather than completely releasing it. This partial reduction is sufficient to balance the braking forces and reduce yaw effects while maintaining adequate braking efficiency. The linear reduction over a predetermined time period (1-6 seconds) ensures smooth transition and optimal performance.
3Stability of the object's composition
If brake pressure is reduced linearly over a predetermined time period, then stability is improved, but response time is extended
Solution Approach 1:
The system implements periodic action by reducing the paired wheel's brake pressure linearly over a predetermined time period (1-6 seconds) rather than instantaneously. This time-based modulation ensures smooth transition, prevents sudden shifts in braking forces, and maintains aircraft stability throughout the pressure reduction process while achieving yaw effect reduction.
Data Source
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AI summary
A method for controlling brake assemblies of a vehicle is provided. Responsive to identifying a locked wheel protection event for a first wheel of a paired set of wheels on the vehicle, where the paired set of wheels is the first wheel on one side of the vehicle and a second wheel on an opposite side of the vehicle, a first brake pressure to a first brake assembly (160a, 160b, 160c, 160d) associated with the first wheel is released to zero pounds per square inch (PSI) and a second brake pressure to a second brake assembly (160a, 160b, 160c, 160d) associated with the second wheel of the paired set of wheels is reduced by a predetermined amount thereby reducing a yaw effect to the vehicle.