Steering Oscillation Compensation Without Mechanical Link
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In steering systems without a mechanical connection between the control unit and the steered wheels, oscillations caused by imbalances are indirectly felt by the driver, leading to discomfort and potential steering issues.
Innovation Solution
The method involves determining the vehicle speed to estimate the frequency and bandwidth of oscillations, characterizing the force or torque on the steering system components, and compensating for these oscillations using a filter and compensation signal, thereby reducing their impact on steering behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mechanical connection is removed between the control unit and steered wheels, then steering system flexibility and automation are improved, but oscillations and imbalances are no longer mechanically isolated from the driver
Solution Approach 1:
The patent introduces a control unit as an intermediary between the steered wheels and the driver. This control unit processes sensor signals from the steered wheels and generates compensating steering commands to eliminate oscillations before they reach the driver through the body path, thereby maintaining the benefits of mechanical decoupling while filtering out harmful vibrations.
Solution Approach 2:
The system implements a feedback mechanism where sensors detect oscillations and imbalances in the steered wheels, and the control unit uses this information to generate compensating steering commands. This closed-loop feedback eliminates harmful vibrations while preserving the flexible steer-by-wire architecture.
2Stability of the object's composition
If oscillation compensation is applied at all speeds, then steering stability is improved, but unnecessary processing and potential interference with normal steering are introduced at low speeds
Solution Approach 1:
The patent applies dynamic activation of the oscillation compensation based on vehicle speed. The control unit activates the compensation algorithm only when vehicle speed exceeds a predetermined threshold, adapting the system's behavior to operating conditions. This prevents unnecessary processing at low speeds while ensuring stability when oscillations are most problematic.
Data Source
AI summary
A method is for compensating an oscillation in a steering system of a vehicle without a mechanical connection between a control unit of the steering system and the steered wheels. A speed of the vehicle is determined. As a function of the speed, an estimated frequency and an estimated bandwidth of the oscillation are determined. A signal characterizing an estimated or measured force or an estimated or measured torque on a toothed rod or tie rod of the steering system is estimated. The oscillation in the signal is compensated as a function of the estimated frequency and the estimated bandwidth.