Steering Reaction Force Timing for Curved Road Entry
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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.
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 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 predicts the steering operation start time in advance and reduces the steering reaction force at a predetermined period before this predicted time, rather than waiting until the actual steering operation begins. This preliminary action ensures the reaction force is already reduced when the driver needs to steer, preventing both operation difficulty and timing delays.
Solution Approach 2:
The system dynamically adjusts the timing of reaction force reduction based on predicted driver behavior and road conditions. By using a predetermined period offset from the predicted steering start time, the system adapts the force reduction timing to match actual driving scenarios, resolving the contradiction between ease of operation and timing accuracy.
2Reliability
If the steering reaction force is reduced earlier by a longer predetermined period for high degree of curve, then the steering operation delay is suppressed, but the system complexity increases
Solution Approach 1:
The system changes the predetermined period parameter based on the degree of curve of the upcoming road section. For sharper curves (higher degree of curve), a longer predetermined period is used to reduce the reaction force earlier, suppressing steering delays. This parameter adaptation achieves reliable steering operation without requiring complex structural modifications.
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.