Adaptive Following Distance for Vehicle Position Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional host vehicle position detection systems fail to correct the absolute position of a vehicle due to missing shape information of road markings, particularly during traffic congestion when road markings are obscured by preceding vehicles.
Innovation Solution
A driving assist method and device that adjusts the inter-vehicular distance to increase the likelihood of capturing road markings by setting a longer target inter-vehicular distance when traffic congestion is detected, allowing for more opportunities to correct the vehicle's position on map data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the host vehicle follows the preceding vehicle closely during traffic congestion, then fuel efficiency and travel time are improved, but the road marking becomes hidden and position correction opportunities are lost
Solution Approach 1:
The patent dynamically adjusts the target inter-vehicular distance based on whether position correction is needed. When correction is needed, the target distance is extended to allow photographing of road markings; when not needed, the normal shorter distance is maintained for efficiency. This dynamic adjustment resolves the contradiction between maintaining close following distance for efficiency and extending distance for information acquisition.
Solution Approach 2:
The system changes the parameter of inter-vehicular distance based on the correction need status. By switching between a first target inter-vehicular distance (shorter) and a second target inter-vehicular distance (longer), the system adapts to different operational requirements, allowing road markings to be captured when necessary without permanently sacrificing travel efficiency.
2Reliability
If the target inter-vehicular distance is extended to capture road markings, then position correction opportunities increase, but fuel consumption increases and travel efficiency decreases
Solution Approach 1:
The target inter-vehicular distance is dynamically adjusted based on correction needs rather than being fixed. The controller extends the distance only when position correction is required, and maintains normal shorter distance otherwise, thus achieving reliable position correction when needed while minimizing fuel consumption during normal operation.
Solution Approach 2:
The system applies extended inter-vehicular distance only partially - specifically when position correction is needed - rather than continuously. This partial application of the distance extension avoids unnecessary fuel consumption while ensuring correction reliability when required.
3Device complexity
If the host vehicle maintains a fixed target inter-vehicular distance, then control simplicity is maintained, but the probability of missing position correction opportunities increases
Solution Approach 1:
The controller uses feedback from the position correction status to adjust the target inter-vehicular distance. When position correction is determined to be needed, the feedback triggers an extension of the target distance; when not needed, the normal distance is maintained. This feedback mechanism improves correction reliability without requiring complex manual intervention.
Solution Approach 2:
The system transitions from a static fixed distance approach to a dynamic adjustable distance approach based on operational needs. The target inter-vehicular distance automatically adapts between two preset values according to whether position correction is required, improving reliability while keeping the control logic relatively simple through predefined switching criteria.
Data Source
AI summary
A driving assist method reduces a possibility of missing an opportunity to correct a host vehicle position set on map data. In the driving assist method using a controller that sets a target inter-vehicular distance from a host vehicle to a preceding vehicle, whether there is a request to execute a correction of a host vehicle position set on electronic map data is determined based on a result of comparing position information on a road sign described on the electronic map data with position information on the road sign acquired by using a camera installed in the host vehicle. If an execution request has not been made, the target inter-vehicular distance is set to a preset first target inter-vehicular distance. If an execution request has been made, the target inter-vehicular distance is set to a second target inter-vehicular distance, which is longer than the first target inter-vehicular distance.