Adaptive Steering Guide Torque Control for Lane Deviation
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Solution Overview
Problem
Drivers experience steering resistance when deviating from a lane, as existing steering guide torque control systems do not adequately adjust the steering guide torque based on the probability of lane deviation, leading to uncomfortable steering experiences.
Innovation Solution
A vehicle steering guide torque control apparatus that estimates the probability of lane deviation using vehicle velocity, deceleration, and the number of selectable lanes, and adjusts the target steering guide torque to reduce resistance by making it smaller when the probability of deviation is high.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the steering guide torque is increased to guide the driver to maintain lane position, then the steering guidance effect is improved, but the driver experiences steering resistance when intending to deviate from the lane
Solution Approach 1:
The steering guide torque is made dynamically adjustable based on the probability of lane deviation. The control unit calculates the probability using multiple parameters (vehicle velocity, deceleration, number of selectable lanes) and varies the torque magnitude accordingly, transitioning from fixed torque to adaptive torque that responds to driving context
Solution Approach 2:
The system changes the torque parameter based on calculated probability of lane deviation. When probability is high (e.g., during deceleration or when multiple lanes are available), the torque is reduced or canceled; when probability is low (normal lane keeping), the torque is applied at normal magnitude, thus adapting the torque parameter to different driving scenarios
2Manufacturing precision
If the steering guide torque is applied to maintain current lane travel, then lane keeping accuracy is improved, but the driver cannot freely perform steering operation to deviate from the lane
Solution Approach 1:
The steering guide torque magnitude is dynamically adjusted based on the calculated probability of lane deviation. The system transitions from a static torque application mode to a dynamic mode where torque is varied or canceled based on real-time driving context, allowing both precise lane keeping and flexible lane deviation as needed
Solution Approach 2:
The control unit continuously monitors multiple parameters (vehicle velocity, deceleration rate, number of selectable lanes) to calculate the probability of lane deviation, and uses this feedback to adjust the steering guide torque in real-time, creating a closed-loop system that adapts to driver intent
Data Source
AI summary
A control unit that controls a reaction force actuator that applies steering guide torque to a steering wheel: calculates, based on a curvature of a curve of a travel road in front of a vehicle detected by a camera sensor, a target steering angle for causing the vehicle to travel along the curve; calculates a target steering guide torque, based on a deviation between the target steering angle that was calculated a prediction time period earlier and an actual steering angle; adjusts a target steering guide torque such that the target steering guide torque becomes smaller as a probability that a driver performs steering operation to deviate from a lane becomes higher; and controls the reaction force actuator such that the steering guide torque becomes the target steering guide torque.