Steering Wheel Torsional Vibration Compensation via Universal Transfer Function
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Solution Overview
Problem
Existing methods for analyzing and compensating for steering wheel torsional vibrations are not flexible and lack effectiveness across different vehicles of the same variant, requiring time-consuming tuning and subjective driver feedback, with limited ability to transfer compensation effectiveness to other vehicles.
Innovation Solution
A method that involves detecting and monitoring chronological changes in interference parameters and wheel frequencies using a detection unit and processing unit, forming a common evaluation data set to analyze and compensate for steering wheel torsional vibrations, allowing for improved behavior analysis and compensation effectiveness across all vehicles of a variant, with the ability to recognize outliers and trends, and adapt the transfer function using machine learning algorithms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a transfer function is determined iteratively on the basis of individual vehicles and stored in a control unit during production, then the compensation can be optimized for that specific vehicle, but the method requires time-consuming tuning by the customer and the transfer function behavior varies strongly over vehicles of the same variant due to manufacturing tolerances and aging
Solution Approach 1:
The patent applies universality by determining a single transfer function on the basis of measurement data from multiple vehicles of the same variant, creating a universal compensation solution that works across the entire vehicle fleet rather than requiring individual vehicle tuning. This resolves the contradiction by making the compensation system universally applicable while maintaining precision through statistical aggregation of data from multiple vehicles.
Solution Approach 2:
The patent uses feedback by continuously monitoring actual steering wheel torsional vibrations and comparing them with the compensation generated by the transfer function, then using this feedback to iteratively optimize the transfer function parameters. This allows the system to self-adjust and improve precision over time without requiring customer intervention or time-consuming manual tuning.
2Device complexity
If only rotor position or rotor velocity is detected to ascertain a dominant interference frequency, then the detection is simple, but analysis and monitoring of the interference frequency and vibration form do not take place, so the effectiveness of compensation cannot be transferred to other vehicles
Solution Approach 1:
The patent applies preliminary action by performing comprehensive analysis of interference frequencies and vibration forms during the production phase using measurement data from multiple vehicles. This preliminary analysis allows the transfer function to be pre-optimized for the entire vehicle variant before deployment, enabling compensation effectiveness to be transferred to all vehicles without requiring complex real-time analysis in each individual vehicle.
Solution Approach 2:
The patent merges the detection and analysis functions by integrating multiple measurement parameters (torque signals, rotor position, rotor velocity, interference frequency, and vibration form) into a unified transfer function that captures the essential characteristics of steering wheel torsional vibrations. This combination allows comprehensive analysis capability while maintaining manageable system complexity through integrated processing.
3Measurement precision
If individual vehicle tuning is performed to optimize the transfer function, then compensation precision is improved for that vehicle, but the process is time-consuming and reduces production efficiency
Solution Approach 1:
The patent resolves this contradiction by creating a universal transfer function that works across multiple vehicles of the same variant, eliminating the need for individual vehicle tuning during production. This universal approach maintains compensation precision through statistical aggregation of data from multiple vehicles while significantly improving production efficiency by removing the time-consuming individual tuning step.
Solution Approach 2:
The patent applies preliminary action by performing the optimization work during the production phase using measurement data from multiple vehicles, rather than requiring post-production tuning. This preliminary optimization of the transfer function for the entire vehicle variant allows mass production to proceed efficiently without compromising compensation precision.
Data Source
AI summary
The disclosure relates to a method for analyzing and/or at least partially compensating steering wheel torsional vibrations, particularly during operation of a steering device in a vehicle, wherein at least one sensing signal is acquired and at least one interference characteristic variable which is correlated to the steering wheel torsional vibration is extracted from the sensing signal. It is proposed that during a monitoring time interval a change over time in the interference characteristic variable and a change over time in a wheel frequency which is correlated to a current wheel rotational speed characteristic variable is monitored and said changes are combined in order to analyze and/or to at least partially compensate steering wheel torsional vibrations to form a common evaluation dataset.