Steer-by-wire Steering Reaction Force Control for Collision Feedback
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Solution Overview
Problem
Conventional steer-by-wire-based vehicle steering systems fail to accurately convey the state of collision or contact with external objects to the driver, as the steering column and rack modules are mechanically separated, leading to unclear feedback during events like wheel ascent over a curb or severe collisions.
Innovation Solution
A steer-by-wire-based vehicle steering control apparatus and method that includes a vehicle state information acquisition unit and a steering reaction force control unit to determine the state of collision or contact with external objects by acquiring operating state information from the steering rack module and controlling the steering reaction force motor to provide haptic responses or lock the steering wheel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the steering column module and steering rack module are mechanically separated in a steer-by-wire system, then the steering system achieves modernization and flexibility, but the driver cannot perceive the state of collision with external objects through haptic feedback
Solution Approach 1:
The patent implements a feedback mechanism where the control unit receives operating state information from the steering rack module (such as rack position, driving motor current, pinion angle) and generates haptic responses through the steering reaction force motor to feed back to the driver. This allows the driver to perceive collision states despite the mechanical separation between steering column and rack modules.
2Adaptability or versatility
If the steering column module and steering rack module are mechanically separated, then the system structure is modernized, but the steering wheel continues to rotate without stopping during severe collisions
Solution Approach 1:
The control unit monitors operating state information in real-time and detects collision states before severe rotation occurs. Upon detecting a collision, the control unit generates appropriate haptic responses and can implement steering wheel locking control to prevent uncontrolled rotation, acting in advance to counteract the harmful effect.
3Device complexity
If conventional steer-by-wire systems are used without additional devices, then device complexity is reduced, but the ability to accurately convey collision state to driver is insufficient
Solution Approach 1:
The control unit performs multiple functions: it controls the driving motor for normal steering operation, processes operating state information for collision detection, and generates haptic responses through the steering reaction force motor. By making the control unit multi-functional, the system conveys collision state information without adding separate dedicated devices.
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
Enables drivers to accurately perceive collisions or contacts through haptic responses or steering wheel locking, enhancing safety without requiring additional device installations and ensuring reliability by utilizing existing control information and sensor signals.
Implementation Method 1
a steering reaction force motor, which is included in the steering column module and provides a steering reaction force to the steering wheel
Data Source
AI summary
Some embodiments relate to a steer-by-wire-based vehicle steering control apparatus, vehicle steering apparatus, and vehicle steering method. The steer-by-wire-based vehicle steering control apparatus may include: a vehicle state information acquisition unit configured to acquire information associated with a state of operating a steering rack module, which is connected to a wheel and is mechanically separated from a steering column module connected to a steering wheel; and a steering reaction force control unit configured to determine a state of collision or contact with an external object based on the information associated with the state of operating the steering rack module and to control an operation of a steering reaction force motor, which is included in the steering column module and provides a steering reaction force to the steering wheel, according to the determination result.