Optical Trailer Sway Detection and Alert System
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Solution Overview
Problem
Vehicle-trailer combinations experience instability, particularly at high speeds, due to decreased vehicle weight and increased oscillations, which can lead to dangerous uncontrollable trailer movements and premature brake wear, as existing stability control systems often intervene too late to prevent critical instability.
Innovation Solution
A method and system using optical sensing means, such as cameras, and additional sensors like ultrasonic sensors to monitor relative movement between the vehicle and trailer, determining trailer yaw conditions, and outputting an alert signal when instability is detected, allowing for early corrective action by the driver or electronic stability systems to avoid brake wear and instability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If Electronic Stability Control (ESC) is used to improve vehicle-trailer stability, then vehicle stability is improved, but brake wear increases and overheating occurs
Solution Approach 1:
The system performs preliminary action by detecting trailer sway at its early stages using sensors (gyroscopic, accelerometric, or optical) and applying corrective braking before the sway becomes critical. This early intervention prevents the need for repeated heavy braking that causes wear and overheating, while still maintaining stability control.
Solution Approach 2:
The system implements continuous feedback by monitoring trailer position, angle, and acceleration through sensors, comparing actual values with desired values, and automatically adjusting brake application accordingly. This closed-loop control optimizes braking intervention to maintain stability while minimizing unnecessary brake wear.
2Stability of the object's composition
If ESC braking is applied frequently to maintain stability, then vehicle-trailer stability is maintained, but brake lifespan decreases due to premature wear
Solution Approach 1:
By detecting and correcting minor trailer sway early in its development, the system prevents escalation to critical instability that would require aggressive, wear-inducing braking. This preliminary correction approach extends brake lifespan while maintaining stability.
Solution Approach 2:
The system applies partial braking action proportional to the detected sway severity, rather than always applying maximum braking. This optimized level of action is sufficient to maintain stability while significantly reducing brake wear compared to aggressive braking strategies.
3Productivity
If high road speed is maintained for productivity, then productivity is improved, but vehicle-trailer stability deteriorates due to lower damping coefficient
Solution Approach 1:
The system continuously monitors trailer dynamics at all speeds and provides active feedback control. At high speeds where damping is reduced, the system detects sway conditions earlier and applies precise corrective braking, enabling safe high-speed operation without compromising stability.
Solution Approach 2:
The system adapts its control parameters based on operating conditions including road speed. By adjusting sensitivity thresholds and corrective action magnitude according to speed-dependent damping characteristics, the system maintains optimal stability control across the full speed range, enabling productive high-speed towing.
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
Enables early detection and prevention of trailer instability, reducing the need for repeated braking and brake wear, and allowing for corrective measures before critical instability develops, thereby enhancing safety and stability during towing.
Implementation Method 1
monitoring relative movement between the vehicle and the trailer using optical sensing means
Implementation Method 2
additional sensors like ultrasonic sensors to monitor relative movement between the vehicle and trailer
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
A method of preventing instability in a vehicle-trailer combination is provided. The method comprises monitoring relative movement between the vehicle and the trailer using optical sensing means, wherein the optical sensing means comprises a camera; determining a trailer yaw condition in dependence on a signal output from the optical sensing means; comparing the determined trailer yaw condition to a predetermined threshold yaw condition; and when the determined trailer yaw condition is equal to or greater than the predetermined threshold yaw condition, outputting an alert signal indicative of the onset of instability in the vehicle-trailer combination directly to a driver of the vehicle in order to allow the driver to take corrective measures, wherein the method comprises capturing a reference image of the trailer using the camera, monitoring the trailer during towing using the camera, and determining the trailer yaw condition based on differences between a monitored image of the trailer and the reference image