Steering Assist Device Curved Path Torque Control
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Solution Overview
Problem
Existing steering assist devices for vehicles fail to effectively prevent lane deviation on curved paths and do not provide sufficient steering torque to maintain the vehicle on a target travel line, leading to potential collisions with other vehicles or guardrails.
Innovation Solution
A steering assist device that includes an electric motor, an information obtaining unit for lateral deviation and curvature data, and a control unit that calculates and applies steering assist torque values to guide the vehicle back onto the target travel line, using a combination of main and sub lane keep assist torques based on lateral deviation, deviation change rate, and curvature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional lane departure warning system is used, then the driver is warned when the vehicle is about to deviate from its lane, but the vehicle cannot be actively guided back to the target travel line
Solution Approach 1:
The steering assist device automatically generates steering torque to guide the vehicle back to the target travel line without requiring additional driver intervention. The system self-regulates by continuously monitoring lateral deviation and autonomously applying corrective steering force through the electric motor.
Solution Approach 2:
The patent replaces passive mechanical warning systems with an active electro-mechanical steering assist system. An electric motor is integrated into the steering mechanism to generate controlled steering torque, transforming the system from purely informational to actively corrective.
2Stability of the object's composition
If steering torque is applied to keep the vehicle turning on a curved path, then the vehicle can maintain the curved trajectory, but additional steering torque is required that may not be provided by conventional systems
Solution Approach 1:
The control unit continuously monitors the vehicle's lateral deviation from the target travel line and the curvature of the path. Based on this feedback, it dynamically adjusts the steering assist torque to maintain stable curved trajectory while compensating for varying steering requirements.
Solution Approach 2:
The steering assist torque is dynamically adjusted based on real-time vehicle state and path curvature. The system adapts the magnitude and direction of steering torque as the vehicle transitions between different curved paths, ensuring stable maintenance of the desired trajectory.
3Reliability
If the vehicle travels near the target travel line, then lane deviation is minimized, but the vehicle may not be properly aligned parallel to the target travel line
Solution Approach 1:
The control unit uses feedback from lateral deviation and lateral deviation change rate sensors to precisely control the vehicle's position and orientation. This dual-parameter feedback enables the system to achieve both lane deviation prevention and proper parallel alignment with the target travel line.
Data Source
AI summary
In a steering assist device, a main lane keep assist current value setting unit sets a main lane keep assist current value that generates main lane keep assist torque according to a lateral deviation and a lateral deviation change rate. A sub lane keep assist current value setting unit sets a sub lane keep assist current value that generates sub lane keep assist torque according to curvature ct of a target travel line.