Tow Vehicle Control Using Critical Speed to Prevent Trailer Sway
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Solution Overview
Problem
Towing a trailer can lead to trailer sway due to changes in vehicle dynamics, making it difficult to control, especially when operating conditions exceed a critical speed where damping between the tow vehicle and trailer cannot prevent oscillation.
Innovation Solution
A method and system that detect operating parameters to determine a critical speed where trailer sway occurs, adjusting vehicle control to operate below this speed, including adaptive cruise control speed limits and spacing adjustments, and providing alerts and recommendations to prevent sway.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the tow vehicle operates at higher speeds to improve productivity, then the travel time is reduced, but trailer sway occurs when exceeding the critical speed making the trailer difficult to control
Solution Approach 1:
The system calculates the critical speed before towing operations begin, and continuously monitors during operation. By knowing the critical speed in advance, the driver can plan the towing route and adjust speeds proactively to avoid entering the dangerous speed range, rather than reacting after sway has already occurred
Solution Approach 2:
The system continuously monitors operating parameters and provides real-time feedback to the driver through warnings when approaching critical speed conditions. This feedback loop allows the driver to adjust speed before trailer sway occurs, maintaining both productivity and control
2Speed
If the vehicle operates above the critical speed, then the travel efficiency is improved, but the damping between the tow vehicle and trailer cannot prevent trailer sway
Solution Approach 1:
The critical speed is calculated in advance based on vehicle and trailer parameters before the towing operation begins. This allows the driver to know the speed threshold below which damping is effective and above which it fails, enabling proactive speed management to maintain reliable damping throughout the journey
Solution Approach 2:
The system identifies and monitors key parameters that affect critical speed (vehicle mass, trailer mass, wheelbase, etc.). By understanding how these parameters influence the critical speed threshold, the system can dynamically adjust operational parameters to maintain safe operating conditions while maximizing travel efficiency
3Productivity
If the tow vehicle length and trailer combined length increase, then the cargo capacity is improved, but the vehicle dynamics change making the vehicle harder to operate
Solution Approach 1:
The critical speed calculation is performed in advance based on the specific vehicle-trailer configuration before the driver begins operation. This preliminary calculation accounts for the increased length and mass, providing the driver with a customized speed threshold that reflects the actual dynamics of their loaded configuration, enabling safe operation of long combined vehicles
Solution Approach 2:
The system calculates critical speed based on actual vehicle and trailer parameters including mass, wheelbase, and configuration. By adapting the critical speed threshold to the specific parameters of the vehicle-trailer combination, the system provides accurate operational guidance regardless of the total length or cargo capacity, making operation of various configurations equally manageable
Data Source
AI summary
A method of operating a tow vehicle and a trailer to prevent trailer sway. The method includes detecting a predetermined maneuver for the tow vehicle and the trailer based on operating parameters. The predetermined maneuver corresponds to a subset of operating parameters from the plurality of operating parameters. A critical speed is determined based on the subset of operating parameters. The critical speed corresponds to a speed of the tow vehicle and trailer where a damping between the tow vehicle and the trailer cannot prevent trailer sway. A vehicle control is adjusted for the tow vehicle based on the critical speed.