Vehicle Speed Limit Display Logic for Construction Zone Signs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle driving assist systems often display incorrect limit speeds by mixing general and construction site speed limits, leading to confusion for drivers, especially when the vehicle moves beyond the construction site.
Innovation Solution
The system uses a vehicle forward information acquisition apparatus and an electronic control unit to differentiate between general and construction site speed limits, displaying the appropriate limit speed based on the vehicle's position and movement distance, ensuring that the correct speed limit is displayed until the vehicle moves beyond the construction site or a predetermined distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the system displays the database limit speed when a construction site road sign is detected, then the speed limit information is updated, but the displayed speed may become incorrect if the vehicle has not yet left the construction site
Solution Approach 1:
The system dynamically adjusts the speed limit display based on vehicle movement distance. When a construction site road sign is detected, the system monitors whether the vehicle has moved beyond a predetermined distance threshold before updating the displayed speed limit, ensuring accuracy while avoiding premature updates
Solution Approach 2:
The system uses feedback from vehicle position detection to control the speed limit display update. By continuously monitoring vehicle movement distance and comparing it against the threshold, the system determines whether to update or maintain the current speed limit display, preventing incorrect information from being shown
2Loss of information
If the system immediately updates the displayed speed limit when database speed is acquired, then the information is current, but it may display wrong speed limit during construction site passage
Solution Approach 1:
The system implements dynamic control logic that adjusts information update timing based on vehicle context. When passing through a construction site, the system delays speed limit updates until the vehicle has moved beyond the predetermined distance, ensuring that timely updates do not compromise information correctness
Solution Approach 2:
The system performs preliminary detection of construction site road signs and anticipates potential speed limit changes. By detecting the construction site context in advance and monitoring vehicle movement, the system prepares to update the speed limit information at the appropriate moment, balancing timeliness with accuracy
Data Source
AI summary
When vehicle forward information includes information on a construction site road sign which indicates the limit speed at a construction site, a vehicle driving assist apparatus acquires the limit speed indicated on the construction site road sign as a construction site sign limit speed, based on the vehicle forward information and displays the acquired construction site sign limit speed on the displaying device. When acquiring the database limit speed while displaying the construction site sign limit speed on the displaying device, and a distance that an own vehicle has moved since acquiring the construction site sign speed limit currently displayed on the displaying device is shorter than a predetermined distance, the vehicle driving assist apparatus continues displaying the construction site sign limit speed on the displaying device without displaying the database limit speed acquired this time on the displaying device.