Steer-by-Wire Alignment Control Under Wheel Interference
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Solution Overview
Problem
In electronic steering apparatus using the steer-by-wire (SBW) method, misalignment occurs between the wheel and steering wheel when the wheel is not rotated due to interference, leading to overcurrent and potential overheating, which can damage the system.
Innovation Solution
An electronic steering apparatus with an input module, first and second driving modules, and a processor that aligns the steering wheel and wheel by generating reaction torque and limiting steering torque based on vehicle and steering states, preventing misalignment and reducing current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the steering motor and reaction motor are excessively driven to maintain alignment between the wheel and steering wheel, then the alignment state is maintained, but overcurrent occurs causing overheating and potential damage
Solution Approach 1:
The system dynamically adjusts the steering torque based on wheel rotation status. When wheel rotation is detected as abnormal (not rotating despite steering input), the controller limits the steering torque to prevent overcurrent, while still maintaining alignment through controlled reaction torque. This dynamic adjustment resolves the contradiction between maintaining alignment and preventing overheating.
Solution Approach 2:
The controller changes the torque parameter based on wheel rotation conditions. In normal operation, full steering torque is applied for precise alignment. When wheel interference is detected, the torque parameter is reduced to a limited value, preventing overcurrent while maintaining sufficient alignment capability through the reaction motor.
2Object-affected harmful factors
If the output of the steering motor is reduced to prevent overheating, then current consumption is reduced, but misalignment occurs between the wheel and steering wheel
Solution Approach 1:
The reaction motor acts as an intermediary to maintain alignment when the steering motor output is limited. While the steering motor provides limited torque to prevent overheating, the reaction motor compensates by generating appropriate reaction torque, ensuring the steering wheel remains properly aligned with the wheel position despite the reduced steering motor output.
Solution Approach 2:
The torque generation function is segmented between two motors: the steering motor handles the primary steering torque (limited to prevent overheating), while the reaction motor handles the reaction torque for alignment maintenance. This segmentation allows each motor to operate within safe current limits while collectively achieving both overheating prevention and alignment accuracy.
3Reliability
If the steering motor is continuously driven to maintain alignment, then alignment is maintained, but current consumption increases leading to energy waste
Solution Approach 1:
Instead of continuous full-power steering motor operation, the system uses periodic detection of wheel rotation status and adjusts torque application accordingly. When wheel rotation is normal, standard torque control is applied. When interference is detected, torque is limited only during the interference period, reducing energy consumption while maintaining alignment when needed.
Solution Approach 2:
The system applies partial torque (limited steering torque) instead of excessive torque during wheel interference conditions. This partial action is sufficient to maintain alignment while significantly reducing current consumption and energy waste, demonstrating that full steering motor power is not always necessary for alignment maintenance.
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
Prevents misalignment and overheating by limiting steering motor output and generating reaction torque based on a limit value, thereby protecting the system and reducing current consumption.
Implementation Method 1
a reaction motor installed on one side of the steering wheel and configured to provide reaction torque according to the rotation of the steering wheel
Implementation Method 2
a steering motor connected to a rack bar to implement a steering manipulation
Data Source
AI summary
Disclosed are an electronic steering apparatus for a vehicle and a method of controlling the same. The electronic steering apparatus for a vehicle includes an input module configured to receive a vehicle state and a steering state, a first driving module configured to drive a reaction motor that provides a steering wheel with a steering feel, a second driving module configured to drive a steering motor that steers a wheel, memory in which an execution program for steering control has been embedded, and a processor operatively coupled to the input module, the first driving module, the second driving module, and the memory.