Vehicle Speed Limit Display Logic for Construction Zone Transitions
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Solution Overview
Problem
Existing vehicle driving assist systems often display incorrect limit speeds by mixing general and construction site speed limits, leading to confusion and potential safety issues when the vehicle moves from one type of road to another without proper updating of displayed speed limits.
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, controlling the display to show the appropriate limit speed based on the vehicle's movement distance and type of road sign detected, ensuring that the correct limit speed is displayed on the vehicle's display device.
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 displayed speed may be incorrect for the current road conditions, but if the system continues displaying the construction site sign limit speed, then the displayed speed may become outdated when leaving the construction site
Solution Approach 1:
The system dynamically switches between displaying database limit speed and construction site sign limit speed based on real-time conditions. When a construction site road sign is detected, the system transitions to displaying the construction site sign limit speed. When the vehicle moves beyond a predetermined distance from the construction site, the system transitions back to displaying the database limit speed. This dynamic adaptation ensures the displayed speed is always appropriate for current road conditions without requiring complex manual intervention.
Solution Approach 2:
The system uses feedback from the vehicle's movement distance and construction site sign detection to control the display. The electronic control unit continuously monitors whether the vehicle has moved a predetermined distance since acquiring the construction site sign limit speed. Based on this feedback, the system automatically determines whether to continue displaying the construction site sign limit speed or switch back to the database limit speed, ensuring accuracy without increasing system complexity.
2Stability of the object's composition
If the system frequently updates the displayed limit speed based on database acquisitions, then the displayed speed may change incorrectly during construction site traversal, but if the system rarely updates, then the displayed speed may become outdated
Solution Approach 1:
The update frequency of the displayed limit speed is dynamically adjusted based on the vehicle's location and movement. During construction site traversal (when distance moved is less than the predetermined distance), the system maintains stable display of the construction site sign limit speed even when database limit speeds are acquired. After leaving the construction site (when distance moved exceeds the predetermined distance), the system updates to display the database limit speed. This dynamic control ensures both stability during construction site traversal and timeliness when transitioning to regular roads.
3Reliability
If the system displays the database limit speed immediately when acquired, then the displayed speed may be wrong during construction site traversal, but if the system waits before updating, then the displayed speed may be outdated after leaving the construction site
Solution Approach 1:
The system performs preliminary assessment of the vehicle's location and movement distance before updating the displayed limit speed. When a database limit speed is acquired, the system first checks whether the vehicle has moved a predetermined distance since acquiring the construction site sign limit speed. Only after this preliminary condition is met does the system update the display. This preliminary action prevents incorrect updates during construction site traversal while ensuring timely updates after leaving the construction site.
Data Source
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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 (10) 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 (22). When acquiring the database limit speed while displaying the construction site sign limit speed on the displaying device (22), and a distance that an own vehicle (100) has moved since acquiring the construction site sign speed limit currently displayed on the displaying device (22) is shorter than a predetermined distance, the vehicle driving assist apparatus (10) continues displaying the construction site sign limit speed on the displaying device (22) without displaying the thus acquired database limit speed on the displaying device (22).