Steering Reaction Force Timing for Curved-Road Vehicle Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle steering control devices fail to adjust the timing of reaction force application to the steering wheel operation consistently across different road curvatures and speeds, leading to potential delays in steering operations, especially on sharply curved roads, which can hinder smooth vehicle travel.
Innovation Solution
A vehicle steering control device that adjusts the timing of reaction force application based on predicted road curvature and vehicle speed by reducing the steering reaction force earlier than the actual steering operation start time, especially for sharper curves and higher speeds, and limits the maximum steering operation to prevent excessive steering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the steering reaction force is reduced at the steering operation start time, then the driver can easily perform the steering operation, but the steering operation may delay and the vehicle cannot suitably travel along the curved road
Solution Approach 1:
The control device reduces the steering reaction force at a timing earlier than the predicted steering operation start time by a predetermined period. This preliminary action ensures that when the driver actually operates the steering wheel, the reaction force is already reduced, facilitating smooth steering operation without delay.
Solution Approach 2:
The system predicts the steering operation start time based on guide steering operation amount and actual steering operation amount, then preemptively reduces the reaction force before the driver's action. This preliminary anti-action counteracts the potential resistance the driver would otherwise encounter during steering initiation.
2Reliability
If the steering reaction force is reduced earlier for sharply curved roads, then the steering operation can be performed without delay, but the control system becomes more complex
Solution Approach 1:
The control device dynamically adjusts the timing of reaction force reduction based on predicted steering operation start time, which varies with road curvature and vehicle speed. The system adapts the predetermined period and reaction force magnitude according to real-time driving conditions, optimizing performance across different scenarios.
Solution Approach 2:
The system continuously monitors the difference between guide steering operation amount and actual steering operation amount to predict steering operation start time. This feedback mechanism enables the control device to accurately determine when to reduce the reaction force, ensuring reliable steering assistance without excessive complexity.
Data Source
AI summary
A vehicle steering control device includes a control device. The control device is configured to control a steering reaction force to be applied to a steering operation performed by a driver of a driver's vehicle, acquire information on a curved road ahead of the driver's vehicle in a traveling direction, set a guide steering operation amount based on the information on the curved road, predict a time at which the driver starts an actual steering operation for driving the driver's vehicle along the curved road as a steering operation start time, and set, based on a difference between the guide steering operation amount and an actual amount of the steering operation, the steering reaction force at a time earlier by a predetermined period than the steering operation start time.