Steering Angle Learning for Superimposed Steering Systems
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Solution Overview
Problem
Motor vehicles with superimposed steering systems face challenges in fully exploiting maximum steering angles due to mechanical and software limits, leading to poorer handling during maneuvering, as existing methods are not suitable for superimposed steering systems and result in limited permissible steering angles.
Innovation Solution
A method that records and evaluates steering force and angle using sensors, with a control device implementing a learning routine to determine absolute maximum steering angles and compute permissible steering angles, which are saved in a memory unit, allowing for maximum exploitation of the steering range without uncomfortable repercussions, by adjusting superimposed steering angles based on vehicle dynamics parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical and software-side stops are applied to limit steering angles in superimposed steering systems, then manufacturing tolerance requirements are reduced and asymmetric end stops are prevented, but the maximum steering angle cannot be fully exploited resulting in poorer handling during maneuvering
Solution Approach 1:
The patent applies dynamics by making the permissible steering angle adjustable rather than fixed. The control device dynamically adapts the permissible steering angle based on current driving conditions and vehicle state, allowing the system to optimize between reliability (preventing asymmetric end stops) and handling capability (maximizing steering angle utilization) in real-time operation
2Manufacturing precision
If permissible steering angles are limited to prevent asymmetric end stops, then manufacturing tolerances are satisfied, but the steering range is not fully utilized reducing maneuvering performance
Solution Approach 1:
The patent applies parameter changes by adjusting the permissible steering angle parameter dynamically. Instead of using a fixed limiting value, the control device modifies this parameter based on detected driving conditions, vehicle dynamics, and current steering state, thereby optimizing the balance between manufacturing tolerance compliance and maneuvering efficiency across different operating scenarios
3Ease of operation
If the maximum steering angle is fully exploited for better handling, then maneuvering performance improves, but asymmetric end stops occur causing jerk at the steering wheel
Solution Approach 1:
The patent applies feedback by continuously monitoring steering angle, steering force, and vehicle dynamics parameters. The control device uses this feedback information to detect when the steering system approaches asymmetric end stop conditions and proactively adjusts the permissible steering angle to prevent jerk while maintaining optimal handling capability throughout the steering range
Data Source
AI summary
A method for teaching permissible steering angles in a steering device of a motor vehicle. A mechanical or software-side stops that limit the steering angle are present or are temporarily applied at the motor vehicle. On the one hand, the steering force applied to the steering wheel and, on the other hand, the steering angle imposed at the input of the steering box are recorded and evaluated directly or indirectly by means of sensors.