Track Deviation Prevention Device Using Dynamic Regulation Lines
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing lane deviation prevention devices uniformly prohibit track deviation prevention steering control when the margin width between the vehicle and the lane markings is smaller than the vehicle width, leading to ineffective use of the steering control even when the vehicle deviates more than necessary from the lane.
Innovation Solution
A track deviation prevention device equipped with a surrounding sensor, a rudder angle changing actuator, and a control unit that adjusts the rudder angle to prevent the vehicle from deviating from the track by moving the deviation regulation lines outside the track when the probability of deviation is high, based on acquired surrounding information and lateral margin distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If track deviation prevention steering control is uniformly prohibited when margin width is smaller than vehicle width, then false positive deviations are avoided, but the steering control function cannot be used even when the vehicle deviates more than needed from the travel lane
Solution Approach 1:
The patent applies local quality by introducing a lateral margin distance parameter that varies based on the specific spatial relationship between the host vehicle and the object. Instead of using a uniform margin width threshold, the system calculates the lateral margin distance as the greater of two distances: the distance from the object to the left side lane marking or the distance from the object to the right side lane marking. This localized adjustment allows the steering control to be applied or prohibited based on the specific geometric context, resolving the contradiction between avoiding false positives and maintaining control functionality.
2Ease of operation
If the deviation regulation line is moved outside the track by offset distance, then the steering control becomes more lenient and aligns with driver intentions, but the track deviation prevention capability is reduced
Solution Approach 1:
The patent implements dynamics by making the deviation regulation line position variable rather than fixed. The system dynamically adjusts the deviation regulation line by moving it outside the track by a predetermined offset distance when the lateral margin distance indicates a low probability of actual deviation. This dynamic adjustment allows the control system to adapt to different driving scenarios, providing leniency when appropriate while maintaining prevention capability when needed, thus resolving the contradiction between driver comfort and track deviation prevention.
Data Source
AI summary
A driving assistance ECU acquires, as a lateral margin distance, a larger distance out of a distance of a space formed between an object and a left lane marking in a track width direction and a distance of a space formed between the object and a right side lane marking in the track width direction when the object is present in front of the host vehicle. The ECU determines whether the probability that a host vehicle deviates from a track when the host vehicle passes by a side of the object is high, based on the lateral margin distance, and moves a deviation regulation line on a side on which the host vehicle is expected to cross out of a left side deviation regulation line and a right side deviation regulation line to an outside of the track by a predetermined offset distance when the probability is high.