Steer-By-Wire Reaction Torque Control for Realistic Steering Feel
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Solution Overview
Problem
Steer-by-wire systems lack the mechanical connection between the steering wheel and vehicle wheels, necessitating a solution to provide an appropriate steering feel to the driver.
Innovation Solution
A steering control device and method that calculates a counter torque using virtual linkage parameters, incorporating information about the steering wheel and rack movement, to simulate the mechanical connection and enhance steering feel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a steer-by-wire system is used to eliminate mechanical connection between steering wheel and vehicle wheels, then the device complexity is reduced and reliability is improved, but the steering feel cannot be provided to the driver
Solution Approach 1:
The patent introduces a counter-force-generating motor as an intermediary device between the steering wheel and the driver. This motor generates counter torque to simulate the mechanical linkage effect, providing steering feel feedback to the driver while maintaining the electrical connection architecture of the steer-by-wire system.
Solution Approach 2:
The patent replaces the mechanical linkage system with an electrical control system that uses a counter-force-generating motor to produce counter torque. This substitution eliminates the need for direct mechanical connection while replicating the steering feel through electrical actuation and control algorithms.
2Ease of operation
If virtual linkage parameters are applied to calculate counter torque, then the steering feel is improved, but the device complexity increases due to additional calculation requirements
Solution Approach 1:
The patent changes the control parameters by introducing virtual linkage parameters (such as virtual spring constant and virtual damping coefficient) that characterize the desired steering feel. These parameters are used in the counter torque calculation to simulate different mechanical linkage characteristics, allowing flexible adjustment of steering feel without physical hardware changes.
Solution Approach 2:
The patent creates a universal control algorithm that can handle multiple steering feel requirements through parameter adjustment. The same counter-force-generating motor and control system can simulate different mechanical linkage characteristics by changing the virtual linkage parameters, making the system adaptable to various driving conditions and vehicle types.
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
Provides an appropriate and optimal steering feel to the driver by determining counter torque based on virtual linkage characteristics and travel conditions, enhancing the steering experience in steer-by-wire systems.
Implementation Method 1
a counter-force-generating motor for supplying a counter force to the steering wheel
Implementation Method 2
a steering motor for axially moving a rack
Data Source
AI summary
Disclosed are a steering control device, a steering control method, and a steering support system including same. Particularly, a steering control device according to the disclosure comprises: a command value calculator for calculating, on the basis of steering information corresponding to the rotation of a steering wheel, a rack movement command value that commands the movement of a rack; a difference value calculator for calculating the difference value between the rack movement command value and the rack movement sensing value by receiving a rack movement sensing value corresponding to the movement of the rack when the movement of the rack is sensed; and a reaction torque calculator for calculating reaction torque on the basis of the difference value and one or more preset virtual linkage parameters.