Vehicle Steering Angle Hold Before Stop to Prevent Tire Twist
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Solution Overview
Problem
Existing steering control techniques result in tire twisting when the steering angle is adjusted to zero after vehicle stop, leading to elastic recovery and subsequent shift in steering angle.
Innovation Solution
Maintain the steering angle at a stop control angle during a pre-stop traveling section and apply oscillation to return it to the stop control angle when output values exceed acceptable ranges, using a steering control device with functional blocks for trajectory control, pre-stop and post-stop removal controls, and steering angle management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the steering angle is simply decreased to zero after vehicle stop, then the steering angle is reduced to neutral position, but the tire becomes twisted and elastically recovers causing steering angle shift
Solution Approach 1:
The system performs preliminary actions by maintaining the steering angle at a stop control angle during a pre-stop traveling section before the vehicle completely stops. This allows the tire to elastically recover from twisting in advance, preventing steering angle shift after stopping. The control device also performs preliminary detection of tire twist state and adjusts the steering angle accordingly before the stopping is finalized.
2Reliability
If the steering angle is maintained at stop control angle during pre-stop traveling section, then tire twist is eliminated and steering angle stability is improved, but power consumption increases
Solution Approach 1:
The control device dynamically adjusts the steering angle maintenance strategy based on real-time detection of tire twist state. When twist is detected, the system maintains the steering angle at the stop control angle during the pre-stop traveling section. When no twist is detected, the system releases the maintenance control, allowing the steering angle to naturally return to zero. This dynamic adaptation optimizes power consumption while ensuring steering angle stability when needed.
3Measurement precision
If oscillation is applied to return steering angle to stop control angle, then steering angle accuracy is improved, but control complexity increases
Solution Approach 1:
The control device applies periodic oscillation to the steering angle when the output value exceeds the acceptable range, causing the steering angle to overshoot and then return to the stop control angle. This periodic action effectively corrects steering angle inaccuracy without requiring complex control algorithms, leveraging simple oscillatory behavior to achieve precise steering angle positioning.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Suppresses steering angle shifts by eliminating tire twist and reducing power consumption, ensuring reliable steering control and ride quality.
Implementation Method 1
the twisted tire elastically recovers while the vehicle is stopped, resulting in a shift in steering angle
Data Source
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AI summary
A steering control device (1) configured to control a steering via a steering actuator (3) of a vehicle includes: a condition determination sub-block (111) configured to determine whether a maintenance condition required to keep a steering angle (θ) at a stop control angle (θs) is satisfied, the steering angle being given by the steering actuator (3) to a tire of the vehicle, the stop control angle being the steering angle which is to be given at a stop position (Ps) where the vehicle stops traveling; and a steering maintenance sub-block (112) configured to keep the steering angle (θ) at the stop control angle (θs) in a pre-stop traveling section in which the vehicle travels until the vehicle arrives at the stop position (Ps) after the maintenance condition is satisfied.