Steer-by-Wire Steering Lock Control Using Feedback Counter-Torque
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Solution Overview
Problem
Steer-by-wire steering systems lack effective steering lock mechanisms that provide a secure and comfortable parking experience, as the steering wheel moves freely between locking positions, making it uncomfortable for drivers to use the wheel as a handle when getting in or out of the vehicle.
Innovation Solution
A method for controlling steering locking in steer-by-wire systems using a feedback actuator with an electric motor connected to the steering shaft, which applies counter-torque to the steering shaft when the ignition is off and movement is detected, ensuring the steering lock engages at predefined positions, mimicking the feel of electromechanical systems and preventing unauthorized use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a steering lock with discrete locking positions is used in a steer-by-wire system, then the steering wheel can be secured against unauthorized use, but the steering wheel moves freely between locking positions making it uncomfortable for drivers
Solution Approach 1:
The patent replaces the traditional mechanical feedback mechanism with an electric motor-driven feedback actuator. This actuator applies counter-torque to the steering shaft to simulate mechanical steering resistance, eliminating the free movement between discrete locking positions while maintaining the locking security function.
Solution Approach 2:
The feedback actuator serves as an intermediary between the steering input and the steering lock mechanism. It mediates the steering shaft movement by applying controlled counter-torque, creating artificial resistance that prevents free movement while allowing the locking function to operate at discrete positions.
2Reliability
If the steering wheel is completely locked at discrete positions, then unauthorized use is prevented, but the driver cannot use the steering wheel as a handle when getting in or out of the vehicle
Solution Approach 1:
The system dynamically adjusts the steering characteristics using the feedback actuator. When the ignition is off and movement is detected, the actuator applies counter-torque to create resistance, simulating locked behavior. When the ignition is on, normal steering operation is restored, allowing the steering wheel to function as a handle.
Solution Approach 2:
The patent changes the torque parameter applied to the steering shaft based on ignition state and detected movement. By dynamically adjusting the counter-torque parameter, the system transitions between secure locked state and functional unlocked state, maintaining both security and adaptability.
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 method effectively locks the steering wheel rotation, enhancing driver comfort and security by simulating the mechanical feedback and feel of conventional systems, ensuring the steering wheel is difficult to move until locked, even when the ignition is off, thereby preventing unauthorized use.
Implementation Method 1
the feedback actuator includes an electric motor with a motor shaft connected to a steering shaft to be able to transmit a torque
Data Source
AI summary
A steer-by-wire steering system including a feedback actuator to simulate a steering feel to a steering device and including an electric motor connected to a steering shaft to transmit a torque, and a steering lock including a latch connected to the steering shaft in a torsion-resistant manner and a lock to engage with the latch at locking positions to block a rotation of the steering shaft. If an ignition is switched-off and a movement of the steering device is detected, a position of the steering shaft and a distance between the lock and a next locking position of the latch is determined. If the distance is greater than a predefined value, a counter-torque is transmitted to the steering shaft by the feedback-actuator opposite to the movement of the steering device until the locking position reaches the lock and the lock can engage with the latch.