Active Drawbar Suspension Control for Jack-Knife Avoidance
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Solution Overview
Problem
Heavy vehicles experience fluctuating coupling forces during towing, leading to discomfort, component wear, and potential jack-knifing, especially on uneven roads and during braking/acceleration, which existing systems struggle to mitigate effectively.
Innovation Solution
A drawbar with a suspension element that dampens relative movement between its end sections, equipped with sensors to measure forces, connected to a control unit that actively manages vehicle combination dynamics to reduce these forces and prevent jack-knifing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid drawbar is used to connect truck and trailer, then structural strength is maintained, but coupling forces fluctuate causing jack-knifing and component wear
Solution Approach 1:
The drawbar is transformed from a rigid static structure to a dynamic system with suspension elements that allow controlled movement. The suspension element enables the drawbar to adapt its configuration in response to road conditions and forces, damping relative movement between end sections to reduce coupling force fluctuations while maintaining structural integrity
Solution Approach 2:
A sensor system is introduced as an intermediary between the drawbar and control system. The sensor detects forces acting on the drawbar and transmits this information to the control system, enabling informed adjustments to braking and propulsion to minimize coupling forces and prevent jack-knifing
2Speed
If braking force is increased to stop the vehicle combination faster, then stopping distance is reduced, but coupling forces increase causing jack-knifing
Solution Approach 1:
The control system implements feedback control by continuously monitoring forces on the drawbar via sensors and adjusting braking and propulsion forces accordingly. When coupling forces approach dangerous levels during braking, the system reduces braking force on the trailer to prevent jack-knifing, maintaining stability while still achieving effective stopping
Solution Approach 2:
The system dynamically changes braking parameters (brake force distribution between truck and trailer) based on real-time conditions. By adjusting the braking force ratio between vehicle units according to detected coupling forces, the system optimizes stopping performance while preventing instability
3Reliability
If the drawbar is made more flexible to reduce coupling forces, then vehicle stability improves, but control precision over the trailer decreases
Solution Approach 1:
The system replaces purely mechanical rigid coupling with a controlled system combining flexible suspension elements and electronic control. Sensors detect forces and the control system actively manages the connection, substituting passive mechanical rigidity with active controlled flexibility that maintains both stability and control precision
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 enhances vehicle stability, reduces wear, and prevents jack-knifing by actively controlling vehicle dynamics based on real-time force measurements, improving safety and comfort.
Implementation Method 1
The suspension element is configured to provide damping of such relative movement
Data Source
AI summary
A control unit for a heavy road vehicle combination, configured to obtain sensor readouts of a state of an active suspension element of a drawbar coupling together first and second vehicle units of the vehicle combination, wherein the state is indicative of a longitudinal force exerted by the first vehicle unit, and to control the vehicle combination based on the readouts, wherein, as part of the control, the control unit is further configured to detect an imminent jack-knifing situation based on the readouts, command a compression or elongation of the active suspension element to cause or extend a delay of a force exerted on the second vehicle unit by the drawbar, and prepare the vehicle combination to avoid or at least alleviate the jack-knifing situation during the delay. A corresponding drawbar arrangement, heavy towing vehicle and heavy vehicle combination are also provided.