Superposed Controller for Vehicle Steering Angle Regulation
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Solution Overview
Problem
Existing electromechanical steering systems lack the ability to adjust control behavior based on driving conditions without an interface, leading to unwanted vehicle behavior due to unmoderated transverse forces and oscillations.
Innovation Solution
A regulating device with a superposed controller and feedback path that adjusts the controller gain and transfer behavior of the first controller unit using a control variable, allowing indirect influence on the input information to improve steering angle regulation, thereby reducing oscillations and disturbing influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the first controller unit is designed as a self-contained unit without external interface, then the device complexity is reduced and manufacturing is easier, but the adaptability to adjust control behavior based on driving conditions is lost
Solution Approach 1:
A superposed controller is introduced as an intermediary device that receives the output of the first controller unit and generates modified input information. This mediator enables indirect adjustment of the first controller's behavior without requiring direct interface access to its internal parameters, thus maintaining manufacturing simplicity while achieving adaptability through the intermediary's control variables.
2Adaptability or versatility
If the controller gain is adjusted directly by modifying the first controller unit, then the adaptability is improved, but the device complexity increases due to additional interface requirements
Solution Approach 1:
The superposed controller acts as a mediator that adjusts the first controller's effective gain indirectly by modifying input information based on control variables. This approach achieves adaptability without requiring direct modification of the first controller's internal structure or addition of complex interfaces, thereby avoiding increased device complexity.
Solution Approach 2:
The control system is segmented into two independent parts: the first controller unit with fixed internal parameters and the superposed controller with adjustable control variables. This segmentation allows the adjustable functionality to be isolated in the superposed controller, maintaining the simplicity of the first controller while achieving overall system adaptability.
3Stability of the object's composition
If the integrating component is used to compensate for transverse forces, then the steering stability is improved, but the oscillations and unwanted vehicle behavior increase under certain driving conditions
Solution Approach 1:
The control system transitions from a static fixed-gain controller to a dynamic system where the effective gain is adjusted based on control variables that reflect driving conditions. The superposed controller dynamically modifies the input information to the first controller, enabling the system to adapt its stabilizing behavior to current operating conditions and avoid oscillations that occur with fixed integrating components.
Data Source
AI summary
The disclosure relates to a regulating device for regulating the steering angle for a vehicle, comprising a first controller unit with a controller superposed thereon, the controller having a feedback path and a prefilter. The feedback path provides a first adjustment variable based on actual steering angle information which is provided by the first controller unit as an output variable and the prefilter provides a second adjustment variable based on nominal steering angle information. The controller is configured to form input information for the first controller unit based on the first and the second adjustment variables, wherein the feedback path has a first correction element, the transfer behavior of which can be adjusted. The prefilter has a second correction element, the transfer behavior of which can be adjusted. The controller is configured such that at least the controller gain of the first controller unit can be adjusted.