Lane Keeping Control Logic for Smooth Multi-Lane Changes
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Solution Overview
Problem
Existing lane departure prevention systems hinder drivers from smoothly changing lanes or moving to adjacent lanes or roadside zones due to automatic steering and warnings, causing discomfort and annoyance.
Innovation Solution
A lane departure prevention device with a control unit that withholds lane keeping control when the vehicle approaches a second lane boundary at a speed equal to or greater than a reference speed, allowing drivers to change lanes without automatic steering or warnings, and dynamically sets reference times and speeds based on vehicle speed and yaw angle to determine when to re-activate control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lane keeping control is reactivated when the return-to-control condition is satisfied after a lane change, then lane keeping control reliability is improved, but driver comfort deteriorates due to hindrance of second lane change attempts
Solution Approach 1:
The patent applies dynamics by making the lane keeping control system adaptive and flexible. The control unit dynamically adjusts the return-to-control condition based on vehicle speed and proximity to lane boundaries. When the vehicle is approaching a lane boundary at high speed, the system withholds reactivation of lane keeping control, allowing the driver to perform additional lane changes if needed. This dynamic adjustment resolves the contradiction by maintaining reliability when safe while preserving driver comfort when flexibility is needed.
2Reliability
If lane keeping control is executed when the vehicle may move out of the lane, then lane keeping safety is improved, but ease of operation deteriorates due to interference with driver's intention to change lanes
Solution Approach 1:
The patent implements feedback mechanisms where the control unit continuously monitors vehicle speed, position relative to lane boundaries, and driver inputs. Based on this feedback, the system intelligently determines when to execute or withhold lane keeping control. When the vehicle is approaching a lane boundary at high speed, the feedback triggers withholding of control execution, preventing interference with the driver's intended lane change while maintaining safety when conditions are favorable.
3Device complexity
If the reference time for return-to-control condition is fixed, then device complexity is reduced, but adaptability deteriorates due to inability to adjust to different driving conditions
Solution Approach 1:
The patent applies parameter changes by making the reference time variable based on vehicle speed and proximity to lane boundaries. Instead of using a fixed reference time, the control unit adjusts this parameter dynamically according to current driving conditions. This allows the system to adapt to different scenarios (e.g., higher speeds require longer reference times) while maintaining manageable complexity through clear conditional logic.
Data Source
AI summary
A lane departure prevention device includes a control unit that executes lane keeping control (automatic steering of a steering wheel and/or issuing of a warning) when it is determined that a vehicle may move out of a lane. The control unit withholds execution of the lane keeping control until it is determined that a return-to-control condition is satisfied when it is determined that a driver has gone from showing no intention to move out of the lane to showing an intention to move out of the lane to cross a first lane boundary. The control unit continues, when it is determined that the vehicle is approaching a second white line present in a traveling direction with a speed equal to or faster than a reference value, continues withholding the execution of the lane keeping control even when it is determined that the return-to-control condition is satisfied.