Antiskid Control Initialization via Wheel Spinup Rate
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Solution Overview
Problem
Existing vehicle antiskid control systems are optimized for dry travel surfaces and fail to effectively initialize on wet or contaminated surfaces due to lack of real-time friction coefficient input, leading to delayed initialization and inadequate skid control.
Innovation Solution
A system that uses wheel spinup data to determine real-time travel surface conditions, applying high or low brake forces based on wheel spinup rates or times to optimize antiskid control initialization, ensuring appropriate brake force application for dry or wet surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing antiskid control initialization is optimized for dry travel surfaces, then dry surface performance is improved, but wet/contaminated surface performance deteriorates due to delayed initialization
Solution Approach 1:
The system dynamically adjusts the antiskid control initialization parameters based on real-time detection of wheel spinup characteristics. The controller monitors the actual wheel spinup rate and compares it against thresholds to determine surface conditions, then adapts the initialization brake pressure accordingly. This dynamic adaptation resolves the contradiction by making the system reliable across both dry and wet/contaminated surfaces rather than being optimized for only dry conditions.
Solution Approach 2:
The system changes the brake pressure parameter during initialization based on detected surface conditions. For dry surfaces, higher brake pressure is applied during spinup, while for wet/contaminated surfaces, lower brake pressure is used. This parameter change allows the same antiskid control system to perform reliably across different surface conditions, resolving the adaptability issue.
2Reliability
If high brake force is applied during wheel spinup on dry surfaces, then skid control is improved, but tire wear increases on wet/contaminated surfaces
Solution Approach 1:
The system changes the brake force parameter based on detected surface conditions during wheel spinup. By monitoring the wheel spinup characteristics and comparing against thresholds, the controller determines whether the surface is dry or wet/contaminated. For dry surfaces, high brake force is applied to maintain effective skid control. For wet/contaminated surfaces, low brake force is applied to prevent excessive tire wear while still providing adequate skid control. This parameter adaptation resolves the contradiction between skid control effectiveness and tire wear.
3Loss of substance
If antiskid control initialization is delayed for wet surfaces, then tire wear is reduced, but skid control response time increases
Solution Approach 1:
The system performs preliminary detection of surface conditions during the wheel spinup phase, which occurs naturally during landing before full braking is required. By detecting the wheel spinup characteristics (rate, duration) during this preliminary phase, the system determines the surface condition and pre-configures the appropriate brake pressure level for subsequent braking. This preliminary action allows the system to initialize quickly without causing excessive tire wear, as the detection occurs during the natural spinup process rather than requiring extended delay.
Data Source
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AI summary
Systems, methods, and apparatus for optimizing real-time antiskid control initialization for a vehicle on a travel surface are disclosed. In one or more embodiments, a method involves determining when at least one wheel of the vehicle touches ground. The method further involves calculating a rate of wheel spin up for at least one wheel. Also, the method involves determining whether the rate of wheel spin up exceeds a wheel spin up rate threshold. In addition, the method involves applying a high level of brake force when the rate of wheel spin up exceeds the wheel spin up rate threshold, and applying a low level of brake force when the rate of wheel spin up does not exceed the wheel spin up rate threshold.