Trailer Oscillation Probing for Heavy-Duty Stability Control
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Solution Overview
Problem
Heavy-duty vehicle combinations face instability issues such as snaking or jack-knifing due to factors like load distribution and center of gravity, which existing stability controllers do not fully address, increasing the risk of accidents.
Innovation Solution
A system and method that actively induces oscillations in the trailer by applying controlled torque to excite oscillations, using components like a hitch assembly, wheel torque generators, or dolly actuators, and detects these oscillations to determine properties like center of gravity and natural frequencies, which are then used by a vehicle controller to enhance safety measures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing stability controllers are used, then basic stability is maintained, but they do not fully address instability issues such as snaking or jack-knifing
Solution Approach 1:
The system performs preliminary probing actions by applying controlled torque to the trailer to excite oscillations and determine properties such as center of gravity and natural frequencies before actual driving conditions arise. This advance characterization enables the stability controller to be better tuned for specific trailer configurations, improving reliability without requiring complex real-time adjustments.
Solution Approach 2:
The system uses the trailer's own dynamic response to excited oscillations to self-characterize its properties. By monitoring the trailer's natural frequencies and oscillation behavior after torque application, the system automatically determines key parameters without requiring external measurement equipment or manual configuration, simplifying the overall control architecture.
2Measurement precision
If trailer properties are actively probed by inducing oscillations, then accurate determination of center of gravity and natural frequencies is achieved, but additional torque generating components and control actions are required
Solution Approach 1:
The torque generating components serve dual functions: they act as standard propulsion or braking elements during normal vehicle operation, and as excitation devices for trailer property probing when activated in specific probing modes. This multi-functionality eliminates the need for separate dedicated probing equipment, maintaining measurement precision while reducing overall system complexity.
Solution Approach 2:
The system applies controlled mechanical vibrations (oscillations) to the trailer through torque generation to excite its natural modes of vibration. By measuring the frequency and damping characteristics of these oscillations, the system accurately determines trailer properties such as natural frequencies and center of gravity location without requiring complex measurement apparatus.
3Reliability
If oscillations are excited to determine trailer properties, then safety is enhanced through better information, but the probing process requires active control during driving
Solution Approach 1:
The system implements periodic probing actions at scheduled intervals or under specific driving conditions rather than continuously. Torque is applied in controlled cycles to excite oscillations, and the resulting trailer response is measured during these periodic events. This approach enhances safety through regular property verification while minimizing disruption to normal driving operations.
Solution Approach 2:
The system continuously monitors trailer response to excited oscillations and uses this feedback to determine trailer properties such as center of gravity and natural frequencies. This feedback information is then fed back to the stability controller to optimize control parameters, creating a closed-loop system that enhances safety while maintaining ease of operation through automatic adaptation.
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
Enhances safety by allowing vehicle controllers to adjust driving conditions based on trailer properties, reducing the risk of rollovers and improving stability during maneuvers.
Implementation Method 1
activate the torque generating component and apply a pre-determined control action to the torque generating component so as to excite oscillations of the trailer
Implementation Method 2
at least one detection unit configured to detect the resulting oscillations of the trailer
Data Source
AI summary
A system for probing properties of a trailer towed by a towing vehicle in a heavy-duty vehicle combination. The system comprises at least one torque generating component for inducing movements of the trailer relative to a yaw axis of the trailer; a control unit configured to, during driving of the vehicle combination, activate the torque generating component and apply a pre-determined control action to the torque generating component so as to excite oscillations of the trailer; and at least one detection unit configured to detect the resulting oscillations of the trailer, wherein the control unit is configured to, based on the detected resulting oscillations, determine one or more properties of the trailer. The invention also relates to a probing method.