Steering Control Device Stationary to Moving Transition
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Solution Overview
Problem
When a vehicle transitions from a stationary steering state to a non-stationary state, the increased steering force provided to the steering mechanism can lead to an uncomfortable feeling for the driver due to excessive wheel turning speed.
Innovation Solution
A steering control device that decreases the steering force provided to the steering mechanism when wheel turning is detected, using different control transfer functions for stationary and non-stationary steering states to manage the current command value and suppress the turning speed of the wheels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If increased steering force is provided to the steering mechanism when the vehicle is in a stationary steering state, then the steering force is sufficient to overcome static friction, but the wheel turning speed becomes excessively high when transitioning to non-stationary state
Solution Approach 1:
The control device dynamically adjusts the steering force based on the detected wheel turning speed. When the vehicle transitions from stationary to non-stationary state, the control device monitors the wheel turning speed and reduces the steering force when the speed exceeds a predetermined threshold, preventing excessive turning speed while maintaining sufficient force for overcoming static friction during stationary steering
Solution Approach 2:
The control device implements a feedback mechanism by detecting the wheel turning speed and using this information to adjust the steering force. The detection unit continuously monitors the wheel turning speed, and the control device compares this detected value with a predetermined threshold to determine whether to reduce the steering force, creating a closed-loop control system that resolves the contradiction between maintaining sufficient steering force and preventing excessive turning speed
Data Source
Figure 1
Figure 2(A)~2(B)
Figure 3(A)~3(B)
AI summary
A steering control device for a vehicle, the steering control device controlling a steering device, the steering device having a steering mechanism (10) configured to steer wheels (15) and a drive unit (40) configured to provide the steering mechanism (10) with steering force for the wheels (15), the steering control device comprising: a detection unit (30) configured to detect turning of the wheels (15); a determination unit (30) configured to determine whether the vehicle is in a stationary steering state; and a control unit (30) configured to increase, when the vehicle is determined to be in a stationary steering state as a result of the determination of the determination unit (30), the steering force to be provided to the steering mechanism (10) than a value upon determination that the vehicle is not in a stationary steering state, wherein the control unit (30) is further configured to decrease the steering force to be provided to the steering mechanism (10) than before when the turning of the wheels (15) is detected as a result of providing the steering force with the steering mechanism (10) when the vehicle has been determined to be in a stationary steering state.