Vehicle Dynamics Control Signal Oscillation Filtering
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Solution Overview
Problem
Vehicle combinations consisting of a towing vehicle and a trailer or semi-trailer exhibit unstable driving behavior above a certain speed limit, leading to swerving issues due to signal oscillations in steering angle signals caused by driver or actuator interventions, which can result in adverse effects on driving dynamics control and potential accidents.
Innovation Solution
A method and system that detect signal oscillations attributed to rolling movements of the trailer or semi-trailer, calculate a reference signal to isolate the base component of the input signal, and use this to determine a manipulated variable to influence the driving state of the towing vehicle, thereby stabilizing the vehicle combination without amplifying oscillations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If steering movements are performed by driver or steering actuator to compensate for yaw oscillations, then the vehicle combination stability is improved, but signal oscillations in steering angle signal are amplified leading to adverse effects on control system
Solution Approach 1:
The patent extracts and separates the harmful oscillating component from the steering angle signal using signal processing techniques. A reference signal is generated that contains only the oscillating component, which is then subtracted from the original steering angle signal to produce a corrected signal free from oscillations. This allows the control system to use the cleaned signal for stable control decisions.
Solution Approach 2:
The patent introduces an intermediary reference signal that represents the oscillating component. This reference signal acts as a mediator between the original steering angle signal and the corrected signal. By generating the reference signal through vehicle model calculations based on detected oscillations, and then subtracting it from the original signal, the harmful oscillations are eliminated while preserving the useful control information.
2Stability of the object's composition
If braking interventions are used to reduce vehicle combination speed below limit speed, then stability is improved, but loss of time and productivity occur
Solution Approach 1:
The patent replaces mechanical braking interventions with a signal processing-based control approach. Instead of reducing speed through brake forces to eliminate oscillations, the system uses electronic signal processing to remove oscillations from the steering angle signal. This substitution allows the vehicle to maintain its speed while achieving stability through corrected control signals.
3Adaptability or versatility
If steering angle signal with oscillations is used for control, then the control system responds to driver's desired direction, but faulty interventions occur due to signal oscillations
Solution Approach 1:
The patent segments the steering angle signal into two distinct components: a useful base signal representing the driver's desired direction, and a harmful oscillating component. By separating these components through signal processing and vehicle model analysis, the system can selectively eliminate the oscillating component while preserving the base signal for reliable control decisions.
Data Source
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AI summary
If rolling movements of a trailer or semi-trailer of a vehicle combination occur, input signals which are incorporated in the calculation of a reference signal often likewise have vibration components, as a result of which a vehicle dynamics control regime for stabilizing the vehicle combination can become unreliable. In order to increase the reliability of a vehicle dynamics control regime of said type, a method is proposed in which an input signal (Y) is measured which has signal vibrations which are to be attributed to a rolling movement of the trailer or semi-trailer and which are superposed on a base component (YBasis) of the input signal (Y). A reference signal is calculated from the input signal (Y), wherein the calculation is carried out such that the reference signal corresponds approximately to a reference signal determined from the base component (YBasis) of the input signal (Y). An actuating variable for influencing the driving behaviour of the tractor vehicle of the combination is then determined as a function of a control deviation between the reference signal and a measured actual signal. The invention also proposes a vehicle dynamics control system which is suitable for carrying out the method.