Steering Control for Lateral Oscillation Prevention in Vehicle Combinations
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Solution Overview
Problem
Long vehicle combinations are prone to lateral instability, leading to accidents due to rearward amplification of motion variables between the leading and connected vehicle units, which existing solutions fail to adequately address, especially in terms of proactive prevention of lateral oscillations.
Innovation Solution
A method that determines critical frequencies of motion variables between the leading and connected vehicle units based on vehicle setup parameters, monitors steering inputs, and automatically triggers countermeasures to prevent lateral oscillations by adjusting steering inputs, using a control system and steering assistance to influence the vehicle's motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If long vehicle combinations are used to improve fuel efficiency and reduce cost, then fuel efficiency and cost are improved, but lateral stability deteriorates due to rearward amplification of motion variables
Solution Approach 1:
The control system performs preliminary analysis of the vehicle combination setup parameters to determine critical frequencies before operation. By identifying critical frequencies in advance and monitoring steering inputs against these frequencies, the system prevents lateral oscillations before they occur, rather than reacting after instability develops. This proactive approach enables long vehicle combinations to maintain lateral stability while operating at extended lengths for improved fuel efficiency.
2Stability of the object's composition
If steering inputs are monitored and countermeasures triggered to prevent lateral oscillations, then lateral stability is improved, but device complexity increases due to control system requirements
Solution Approach 1:
The control system continuously monitors steering inputs and compares them against predetermined critical frequencies derived from vehicle combination setup parameters. When a steering input is detected that could excite critical frequencies, the system automatically triggers countermeasures such as providing force feedback to the steering wheel or issuing warnings to the driver. This closed-loop feedback mechanism maintains lateral stability through automated responses rather than requiring complex manual intervention systems.
3Stability of the object's composition
If critical frequencies are determined based on setup parameters and steering inputs are adjusted to avoid them, then lateral oscillations are prevented, but ease of operation decreases due to automated steering intervention
Solution Approach 1:
The system applies preliminary anti-action by providing force feedback or warnings to the driver before lateral oscillations can develop. When the monitoring system detects that a steering input approaches critical frequencies, the countermeasure actively opposes the potentially harmful steering action through force feedback on the steering wheel or auditory/visual warnings. This allows the driver to maintain ease of operation by making natural steering adjustments while the system subtly guides them away from dangerous frequency ranges, preventing oscillations before they affect vehicle stability.
Data Source
AI summary
The invention relates to a method of reducing or preventing lateral oscillations of at least one connected vehicle unit of a vehicle combination, the method comprising providing one or more parameters associated with a setup of the vehicle combination; determining, based on the one or more parameters, one or more critical frequencies having critical rearward amplification of a motion variable between the leading vehicle unit and the at least one connected vehicle unit; monitoring a steering input to the leading vehicle unit; determining whether the steering input excites any of the one or more critical frequencies; and automatically triggering a countermeasure for reducing or preventing lateral oscillations of the at least one connected vehicle unit upon determining that the steering input excites any of the one or more critical frequencies.