Vehicle Steering Control Device for Locus Stabilization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
When individually correcting the steered angles of right and left wheels during vehicle curvature, existing systems cause fluctuations in the turning state, leading to deviations from the desired travel route, resulting in suboptimal vehicle behavior and energy loss.
Innovation Solution
A control device with a processor that independently controls the steered angles of each wheel by determining and adjusting turning command values based on vehicle behavior state quantities, optimizing the vehicle's behavior to follow a target route, and stabilizing the turning locus through a linkless steer-by-wire system using actuators and sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the steered angles of the right and left steered wheels are individually corrected to improve vehicle behavior and suppress energy loss, then the marginal performance of vehicle behavior is improved and energy loss is suppressed, but the total sum of tire lateral force changes causing fluctuation in the turning state and deviation from the desired travel route
Solution Approach 1:
The control device employs feedback mechanisms by continuously monitoring the actual travel route and vehicle state quantities, then adjusting the steered angles of right and left steered wheels based on the difference between actual and target routes. This closed-loop control ensures that individual wheel angle corrections do not cause cumulative deviations, maintaining stable turning state while achieving energy efficiency.
Solution Approach 2:
The system dynamically adjusts steered angles as control parameters based on vehicle speed, steering angle, and desired travel route. By changing the steered angle parameters adaptively rather than using fixed corrections, the system optimizes energy loss suppression while preventing turning state fluctuation and route deviation.
2Productivity
If the steered angles of the right and left steered wheels are individually corrected to optimize vehicle behavior, then the marginal performance of vehicle behavior is improved, but the vehicle may deviate from the desired travel route
Solution Approach 1:
The control device continuously compares the actual travel route with the desired travel route and uses this feedback to adjust the steered angles of right and left steered wheels. This ensures that performance optimization through individual wheel correction does not compromise route accuracy, as any potential deviation is detected and corrected in real-time.
Solution Approach 2:
The system performs preliminary calculations to determine the optimal steered angles for right and left steered wheels based on the desired travel route and current vehicle state. By pre-calculating the necessary angle corrections and applying them proactively, the system maintains both optimized vehicle behavior and accurate route following.
3Ease of operation
If a linkless steer-by-wire system is used to independently control steered wheels, then ease of operation and adaptability are improved, but device complexity increases
Solution Approach 1:
The patent implements a linkless steer-by-wire system that replaces traditional mechanical linkages connecting the steering wheel to steered wheels with electronic control. This substitution enables independent control of right and left steered wheels, improving ease of operation and adaptability, while the electronic architecture manages the inherent complexity through software-based control algorithms.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A control device includes a processor (140). The processor (140) is configured to perform a route acquisition process for acquiring route information indicating a target route of a vehicle. The processor (140) is configured to perform a behavior optimization process for correcting, based on at least one of a plurality of state quantities indicating a behavior of the vehicle during traveling, each of a left turning command value and a right turning command value such that the behavior of the vehicle becomes a target behavior. The processor (140) is configured to perform a locus stabilization process for correcting, based on at least one of the state quantities indicating the behavior of the vehicle during traveling, a steering command value such that the vehicle travels on the target route.