Dual-Actuator Wheel Braking With Torque Limit Interruption
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Solution Overview
Problem
Conventional braking systems for aircraft landing gear face disparities in braking torque between wheels, are less effective at high speeds, and require oversized structures due to disproportionate low-speed response, while also being heavy and inefficient, which contradicts the goal of reducing fuel consumption and emissions.
Innovation Solution
A braking device with dual actuators and a control system that monitors and adjusts braking torque individually, using sensors to prevent excessive torque and ensure balanced energy distribution, featuring a servo control loop and redundant sensors to enhance reliability and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional braking systems apply pressure on brake pedals to generate braking torque, then braking effectiveness at low speeds is improved, but the structure becomes over-sized and weight increases due to disproportionate low-speed response
Solution Approach 1:
The patent applies dynamics by making the braking system adaptive to different speed conditions. The control system dynamically adjusts braking torque based on detected wheel speed, applying higher torque at low speeds and reduced torque at high speeds. This dynamic response allows the use of a smaller, lighter brake structure that isn't oversized for low-speed conditions, while still providing effective braking across the full speed range.
2Device complexity
If conventional braking systems use identical pressing force on each brake, then system simplicity is maintained, but disparities in braking torque occur between wheels due to wear and other factors
Solution Approach 1:
The patent implements feedback control by using sensors to detect actual wheel speed and braking torque, then feeding this information back to the control system. The control system processes this feedback and adjusts the pressing force on each brake individually to maintain consistent braking torque across all wheels, compensating for wear and other variations. This feedback mechanism ensures reliable and consistent braking performance.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the pressing force parameter based on wheel conditions. Instead of maintaining a fixed identical force on all brakes, the system varies the pressing force parameter for each brake according to its specific condition (wear, temperature, etc.), while keeping the overall control architecture relatively simple through standardized adjustment algorithms.
3Speed
If conventional braking systems are designed for high-speed effectiveness, then high-speed braking performance is improved, but low-speed response becomes disproportionate and requires over-sized structures
Solution Approach 1:
The patent applies dynamics by implementing a speed-dependent control strategy that adapts braking torque to the current operating speed. At high speeds, the system provides strong braking torque for effective deceleration. As speed decreases, the control system automatically reduces the torque demand proportionally. This dynamic adaptation allows a single, optimally-sized brake structure to handle both high-speed and low-speed conditions without being oversized, simplifying the overall device design.
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
The solution provides a robust, reliable, and efficient braking system that balances torque distribution across wheels, reduces the risk of excessive braking, and improves safety by preventing over-torque conditions, thus addressing the inefficiencies and weight issues of conventional systems while meeting environmental standards.
Implementation Method 1
The braking system generally comprises brakes mounted on wheels of the vehicle and making use of the principle of friction between two surfaces that are put into contact under the action of a pressing force.
Data Source
AI summary
The invention relates to a device for braking a wheel, the device comprising:a brake including at least a first actuator and a second actuator arranged to apply a braking torque to the wheel;a control system arranged to control the first and second actuators individually as a function of a required braking value; andat least a first breaking torque sensor arranged to supply the control unit with a first measurement of the braking torque applied to the wheel by the brake.According to the invention, the control system is arranged to interrupt control of the first actuator or control of the second actuator in the event of the braking torque measured by the first sensor exceeding a predetermined braking torque limit.