Brake Controller Reset Schedule Adaptation for Wheel Skid Mitigation
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Solution Overview
Problem
Existing braking systems, particularly in aircraft, face challenges in effectively mitigating skids at lower wheel speeds, where detection and mitigation are more difficult compared to higher speeds.
Innovation Solution
A brake control system and method that adjust the control signal based on wheel speed, using a mu-slip curve and PID controller to dynamically respond to skid conditions, ensuring proportional braking and continuous adjustment to prevent wheel lock and skidding, utilizing processors and sensors to manage braking operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional braking systems are used, then braking control is effective at higher speeds, but skid detection and mitigation becomes difficult at lower speeds
Solution Approach 1:
The control system dynamically adjusts the reset schedule of the integrator based on real-time wheel speed measurements. As wheel speed decreases, the reset schedule is adjusted to occur more frequently, enabling the system to adaptively respond to skid conditions at lower speeds where skids are more difficult to detect and mitigate.
Solution Approach 2:
The system changes the operational parameters of the integrator reset schedule based on wheel speed conditions. By modifying the reset timing parameter dynamically according to measured wheel speed, the system optimizes its response characteristics for different speed regimes, particularly improving detection capability at lower speeds.
2Adaptability or versatility
If fixed reset schedule is used, then system simplicity is maintained, but adaptability to varying wheel speeds is reduced
Solution Approach 1:
The system implements feedback by continuously monitoring wheel speed and using this information to adjust the integrator reset schedule. The wheel speed measurement feeds back to the control logic, which then modifies the reset timing to match current operating conditions, achieving adaptability while maintaining relatively simple system architecture.
Solution Approach 2:
The control system serves itself by automatically adjusting its own reset schedule based on measured wheel speed conditions. The system uses its own operational state information to self-regulate the integrator behavior, eliminating the need for external intervention or complex manual configuration.
Data Source
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AI summary
A method for controlling a braking operation applied to a wheel (22) of a wheel assembly (18) includes receiving a command signal in proportion to an amount of braking requested at an input device; outputting a control signal in proportion to the command signal; receiving a wheel speed signal indicative of a speed of the wheel; calculating an adjustment signal in proportion to the wheel speed signal; providing a modified control signal to a brake actuator based on the control signal and the adjustment signal; and continually resetting a reset schedule based on the wheel speed signal.