Steer-By-Wire Skid Feedback Through Reaction Torque Control
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Solution Overview
Problem
Existing steer-by-wire systems struggle to effectively notify drivers of a vehicle skid state through the steering wheel, which is crucial for enhancing vehicle safety.
Innovation Solution
A steer-by-wire system that adjusts reaction force torque based on steering angle, vehicle speed, and motor torque to notify drivers of a skid state via the steering wheel, using a control apparatus that includes a reaction force generation apparatus and a steering apparatus, with a control unit that calculates and outputs appropriate reaction force torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the steering apparatus and reaction force generation apparatus are mechanically separated in a steer-by-wire system, then the system achieves greater design flexibility and independence of components, but the ability to effectively notify the driver of vehicle state through reaction force torque is compromised
Solution Approach 1:
The control apparatus continuously monitors vehicle state parameters (steering angle, vehicle speed, motor torque) and uses this feedback to dynamically adjust the reaction force torque applied to the steering wheel. This closed-loop feedback mechanism ensures the driver receives appropriate haptic feedback about vehicle skid states despite the mechanical separation of components.
Solution Approach 2:
The patent replaces direct mechanical connection between steering and reaction force generation with an electronic control system. The control apparatus processes sensor data and generates control signals for the reaction force motor, substituting mechanical coupling with electronic signaling and software-based control logic to achieve component independence while maintaining functional integration.
2Loss of information
If the reaction force torque is adjusted dynamically based on multiple parameters during skid conditions, then the driver notification effectiveness is improved, but the control system complexity increases
Solution Approach 1:
The control apparatus performs multiple functions using a single integrated system: it calculates basic reaction force torque from steering angle, detects skid conditions by monitoring vehicle speed and motor torque, determines correction amounts based on skid detection, and outputs corrected reaction force torque. This multi-functional approach consolidates complexity into a single control unit rather than requiring separate systems for each function.
Solution Approach 2:
The control apparatus pre-calculates the basic reaction force torque from the steering angle before skid conditions occur, and prepares correction logic based on anticipated vehicle states. When skid conditions are detected, the pre-established correction algorithms are applied immediately, reducing the computational burden during critical moments and simplifying real-time control decisions.
Data Source
AI summary
In one mode of a steer-by-wire system, a steer-by-wire control apparatus, and a steer-by-wire control method according to the present invention, when a vehicle is undergoing skid, a reaction force generation apparatus decreases or increases reaction force torque from basic reaction force torque calculated from a steering angle of a steering wheel, based on the steering angle, a vehicle speed of the vehicle, and motor torque of a turning motor, and outputs the calculated reaction force torque as skid reaction force torque. In this way, the driver can be appropriately notified of a vehicle skid state via the steering wheel.