Steering Assist Device Dynamic Gain Correction
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Solution Overview
Problem
Existing steering assist devices for vehicles are inadequate in quickly returning a vehicle to its target travel line when it deviates due to driver error or road conditions, potentially leading to 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 change rate, a steering assist current value setting unit, a lane keep assist current value calculation unit, and a control unit to generate lane keep assist torque, which increases when the vehicle is deviating from the target line, ensuring rapid correction and alignment with the target travel line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional steering assist devices are used, then basic steering assistance is provided, but the vehicle cannot quickly return to the target travel line when deviating
Solution Approach 1:
The steering assist current value is dynamically adjusted based on real-time lane deviation and deviation change rate. When the vehicle deviates from the target travel line, the system increases the steering assist current value to provide stronger corrective torque, enabling faster return to the lane while maintaining safety
Solution Approach 2:
The system continuously monitors lane deviation and deviation change rate, using this feedback to adjust the steering assist current value. This closed-loop control ensures the vehicle quickly and safely returns to the target travel line by adapting the assist force to the current deviation state
2Speed
If lane keep assist torque is increased to quickly correct deviation, then response speed improves, but steering system complexity increases
Solution Approach 1:
The system changes the electrical parameter (steering assist current value) based on lane deviation conditions. By adjusting this parameter dynamically rather than modifying mechanical components, the system achieves fast correction while keeping the physical steering structure simple
Data Source
AI summary
In a steering assist device, a correction gain setting unit sets correction gain to one if it determines that that the sign of a lateral deviation change rate is different from that of a second derivative value of a lateral deviation. The correction gain setting unit sets the correction gain to a predetermined value that is larger than one, if it determines that that the sign of the lateral deviation change rate is the same as that of the second derivative value of the lateral deviation. A gain multiplication unit corrects a lane keep assist current value calculated by a lane keep assist current value calculation unit by multiplying the lane keep assist current value by the correction gain set by the correction gain setting unit.