Steer-By-Wire Steering Calibration Without Shaft Positioning
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Solution Overview
Problem
Existing steer-by-wire steering systems are complicated, large, and costly due to the need for shaft and collar positioning mechanisms, which complicates assembly and increases size and cost.
Innovation Solution
A steering system with a control unit that corrects the output of the steering angle sensor to align with the control steering center, allowing assembly without physical positioning mechanisms, and sets control maximum steering angles to prevent excessive rotation and collision, using a control steering center setting switch to facilitate easy calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If shaft positioning mechanism and collar positioning mechanism are used to ensure precise assembly, then assembly precision is improved, but device complexity increases and manufacturing cost increases
Solution Approach 1:
The patent replaces mechanical positioning mechanisms with a control unit that performs software-based calibration. The control unit corrects the output of the steering angle sensor through computational adjustment, eliminating the need for physical shaft positioning mechanisms and collar positioning mechanisms. This substitution of mechanical systems with electronic control achieves precise assembly alignment without adding structural complexity.
Solution Approach 2:
The patent changes the output parameters of the steering angle sensor through calibration procedures. The control unit adjusts the sensor output values to correspond to the actual geometric steering center, effectively correcting assembly deviations without requiring physical repositioning mechanisms. This parameter-based adjustment resolves the contradiction by achieving precision through software rather than mechanical means.
2Manufacturing precision
If shaft positioning mechanism and collar positioning mechanism are used to ensure precise assembly, then assembly precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent eliminates expensive mechanical positioning components by implementing a software-based calibration system. The control unit corrects steering angle sensor outputs through computational methods, replacing the need for costly shaft positioning mechanisms and collar positioning mechanisms. This approach reduces manufacturing costs while maintaining assembly precision.
3Productivity
If steering wheel is assembled with geometric center deviated from control steering center, then assembly work efficiency is improved, but steering angle measurement accuracy deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the control unit receives the steering angle sensor output and compares it with the actual geometric steering center position. Based on this feedback, the control unit corrects the sensor output to accurately reflect the steering angle relative to the control steering center. This allows assembly without precise alignment while maintaining measurement accuracy through software correction.
Solution Approach 2:
The patent dynamically adjusts the steering angle sensor output parameters based on the actual assembly position. When the geometric center is deviated from the control steering center, the control unit modifies the sensor output values to compensate for the deviation. This parameter transformation maintains measurement accuracy regardless of assembly variations, enabling efficient assembly without compromising precision.
Data Source
AI summary
A steering system is provided with a control unit (15) configured to determine a target steered angle (αt) according to a steering angle (β) of a steering shaft (18) which is fitted with a steering wheel (19) and drive a steering actuator so as to cause the steered angle (α) to coincide with the target steered angle, and to determine a target reaction force (Tt) according to a steered state of the wheels and drive a reaction force actuator (13) so as to cause the reaction force to coincide with the target reaction force. The control unit is configured to correct an output of the steering angle sensor in such a manner that a geometric steering center of the steering wheel coincides with a mechanical steering center of the steering shaft upon receiving a prescribed input (S) from a manual input switch (37).