Trailer Snaking Control via Asymmetric Wheel Braking
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Solution Overview
Problem
Existing methods for reducing snaking movements in vehicle trailers are either ineffective or require complex parameter adjustments and technical efforts, as they fail to account for changing trailer parameters and often exacerbate the issue due to phase shifts in braking interventions.
Innovation Solution
A method where wheel brakes are applied uniformly on both sides at the zero crossing of snaking movement deflection and slowly reduced when wheel slip is detected, maintaining braking until the maximum amplitude is reached, then reduced to minimal pressure to prevent further oscillation, with the brake pressure pulsating in sync with trailer vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wheel brakes are applied on both sides with the same force during snaking movements, then the braking intervention is simple to implement, but the inner wheel may lock due to relief from rolling movement, reducing braking effectiveness
Solution Approach 1:
The patent applies different braking forces to left and right wheels based on their individual loading conditions. The braking force is adjusted locally at each wheel according to the lateral acceleration and wheel slip detection, preventing inner wheel lock while maintaining effective braking on the outer wheel.
Solution Approach 2:
The braking intervention dynamically adjusts the braking force on each side based on real-time detection of lateral acceleration and wheel slip. The system continuously monitors and modifies brake application during the snaking movement, transitioning from static equal-force braking to dynamic asymmetric braking.
2Reliability
If braking intervention is applied with lateral offset and differential control, then snaking movements can be reduced more effectively, but the system complexity increases due to need for exact trailer parameters and time factor compensation
Solution Approach 1:
The system uses the trailer's own dynamic response during snaking movement to automatically determine the correct braking intervention. By detecting lateral acceleration and wheel slip in real-time, the system self-adjusts without requiring pre-programmed trailer parameters or complex calibration procedures.
Solution Approach 2:
The patent implements a feedback mechanism where the braking intervention is continuously adjusted based on detected lateral acceleration and wheel slip. The system monitors the trailer's response to braking and automatically modifies the brake application to maintain optimal correction without over-complicating the control system.
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
This method effectively reduces snaking movements by applying controlled braking forces that match trailer oscillations, minimizing the risk of increased rolling motion and reducing material stress, while avoiding unwanted energy input during swinging back.
Implementation Method 1
the wheel brakes are applied on both sides when a snaking movement occurs
Data Source
AI summary
The method involves providing vehicle trailers with left- or right-sided wheel brakes and stretching the brakes at a time point of zero crossing of deflection of the rolling movement or real time to the time point. The brakes are further released at a time point of respective succeeding largest amplitude of the deflection of the rolling movement. A brake pressure is constantly withdrawn both for the left- and right-sided brakes slowly within 0.1 to 0.5 seconds until the cancellation of a braking action if a predetermined wheel slip due to a blocking inclination of a wheel is detected.