Four-Wheel Independent Steering for Accurate Parallel Wheel Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Four-wheel independent steering vehicles face challenges in accurately aligning wheel positions during parallel movement due to wheel angle distortions, requiring additional driver steering to correct misalignments.
Innovation Solution
A system and method that includes a steering angle sensor, motor controller, and processor to set a parallel movement mode, adjust wheel positions, and limit steering angles within a specified range using a position controller and motor controller to ensure accurate wheel alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the wheels are collectively adjusted for parallel movement, then the vehicle can move in parallel direction, but wheel angle distortion causes positioning errors requiring additional driver steering
Solution Approach 1:
The system continuously monitors the actual wheel positions and steering angles, comparing them with the target parallel movement configuration. When deviations are detected, the control system automatically adjusts the wheel angles to compensate for distortions, eliminating the need for additional driver steering corrections.
Solution Approach 2:
The control system automatically detects and corrects wheel position errors without requiring driver intervention. The system self-adjusts the wheel angles by controlling the drive shafts to maintain accurate parallel movement, making the vehicle self-correcting rather than relying on continuous driver steering input.
2Manufacturing precision
If the steering angle is limited to a range, then accurate wheel positioning is achieved, but the steering wheel rotation freedom is restricted
Solution Approach 1:
The steering angle limit is not a fixed constraint but a dynamic parameter that adapts based on the vehicle's operational mode. When parallel movement is detected, the system applies angle limits to ensure positioning accuracy. When normal driving modes are active, the full steering range remains available, making the limitation conditional rather than absolute.
3Productivity
If four wheels are controlled independently with large rotation angles, then maneuverability is improved, but wheel alignment control becomes complex
Solution Approach 1:
The control system divides the four-wheel independent steering into separate controllable units, each with its own drive shaft and motor. This segmentation allows independent control of each wheel while maintaining overall system coordination, simplifying the control architecture compared to a fully integrated approach.
Solution Approach 2:
The control system is designed to handle multiple driving modes (parallel movement, normal driving, maneuvering) through a single unified controller that adapts its control strategy based on the detected mode. This multi-functionality reduces the need for separate control systems for different operational requirements.
Data Source
AI summary
Disclosed herein are a system and method for controlling four-wheel independent steering vehicles. The system includes a steering angle sensor configured to detect a steering angle in relation to movement of a steering wheel, a motor controller configured to change a position of a wheel in response to the steering angle, a parallel movement key configured to set a parallel movement mode, and a processor configured to primarily adjust the position of the wheel through the motor controller by setting the parallel movement mode in response to the input of the parallel movement key and to control the motor controller to secondarily adjust the position of the wheel in response to the steering angle by limiting the steering angle of the steering wheel to a range of a limit angle. Therefore, it is possible to prevent the steering angle from changing significantly.