Turning Controller for Multi-Wheel Vehicle Steering
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Solution Overview
Problem
Conventional steering devices struggle to stabilize vehicle operation when turning at high speeds, especially in vehicles with three or more independent steering wheels, leading to uncomfortable steering experiences for drivers and passengers.
Innovation Solution
A turning controller that generates a final steering command value based on a steering angle signal or a steering command value, and calculates a turning angle command value for each wheel, reducing the turning angle with increasing vehicle speed. This controller ensures that each turning actuator follows the calculated turning angle command value by controlling the driving current supplied to it.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the turning angle is increased to improve steering responsiveness, then the steering command is more effective, but vehicle stability deteriorates at high speeds
Solution Approach 1:
The patent applies dynamics by making the turning angle command value dynamically adjustable based on vehicle speed. The controller automatically reduces the turning angle command value when vehicle speed exceeds a threshold, transforming a static steering system into a dynamic one that adapts to operating conditions. This resolves the contradiction by allowing high steering responsiveness at low speeds while automatically reducing it at high speeds to maintain stability.
2Stability of the object's composition
If the turning angle command value is reduced at high speeds to stabilize vehicle operation, then vehicle stability is improved, but steering effectiveness deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the turning angle command value parameter based on vehicle speed conditions. When vehicle speed exceeds a predetermined threshold, the controller changes the parameter value by reducing it to a smaller value, thereby stabilizing vehicle operation at high speeds while maintaining steering control.
3Adaptability or versatility
If independent steering control of three or more wheels is implemented to improve maneuverability, then steering versatility is improved, but system complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the steering control into independent control units for each wheel. Each of the three or more wheels has its own turning actuator and controller that can be independently controlled, allowing the system to achieve complex steering patterns through coordinated action of segmented control units rather than through a complex mechanical linkage system.
Data Source
AI summary
A turning controller in a vehicle controls turning of each wheel using independent turning actuators for three or more wheels that are not mechanically connected. The vehicle also features a steering command device for automated driving or a steer-by-wire system, which is separated from the turning actuators. The turning controller includes a generator that creates a final steering command value based on signals from the steering mechanism or the steering command device. A calculator within the turning controller then determines a turning angle command value for each wheel, considering the vehicle's speed; higher speeds result in reduced turning angles. Controllers for each turning actuator regulate the driving current to ensure the turning angle matches the command value.