Steer-by-Wire Rotation Limiter for Steering Feel Feedback
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Solution Overview
Problem
In steer by wire type steering systems, the lack of mechanical connection between the steering wheel and vehicle wheels results in indefinite rotation of the steering wheel, reducing driver's steering feel and stability.
Innovation Solution
A steer by wire type steering apparatus with a rotation angle limiting mechanism using an output shaft, moving member, guide stoppers, elastic ring, and housing to mechanically prevent the steering wheel from rotating beyond a maximum point, enhancing steering feel and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a steer by wire type steering system is used to eliminate mechanical connection components, then the steering system becomes more simplified and control precision is improved, but the driver's steering feel and steering stability deteriorate due to indefinite rotation of the steering wheel
Solution Approach 1:
A reaction force generation mechanism is introduced as an intermediary between the steering wheel and the driver's hand. This mechanism generates a reaction force that opposes the driver's steering input, providing tactile feedback and steering stability without requiring a direct mechanical connection to the vehicle wheels. The reaction force acts as a mediator that transmits steering information back to the driver, resolving the contradiction between simplified structure and steering stability.
2Ease of operation
If the steering wheel is allowed to rotate indefinitely in a steer by wire system, then the steering operation becomes more flexible, but the steering feel and driver awareness of wheel position deteriorate
Solution Approach 1:
A reaction force generation mechanism provides continuous feedback to the driver about the steering wheel's rotational state. As the steering wheel rotates, the mechanism generates a corresponding reaction force that increases with rotation angle, giving the driver tactile information about the current steering position. This feedback loop maintains driver awareness of wheel position while preserving the flexibility of unlimited rotation capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides increased driver steering feel and safety by mechanically limiting the steering wheel rotation when the vehicle wheel reaches its maximum point, improving steering stability.
Implementation Method 1
an elastic ring coupled to one end and another end of the guide stoppers to elastically support the guide stoppers in a radial direction
Data Source
AI summary
A steer by wire type steering apparatus according to the embodiments of the present disclosure comprises an output shaft provided with fixing grooves on both sides, a moving member which moves in the axial direction when the output shaft is rotated and is provided with a guide portion protruding in the radial direction on an outer circumferential surface, a pair of guide stoppers for guiding the axial movement of the moving member, an elastic ring for elastically supporting the guide stoppers in a radial direction, and housing.