Control Map Output with Preloaded Backup Ranges for Automated Driving
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Solution Overview
Problem
Existing map information systems for automatic driving control can cause inconvenience due to temporary communication disruptions with the center device, leading to inconsistencies and interruptions in constructing control map information.
Innovation Solution
A map information output device that downloads and constructs control map information using a high-precision map from a center device, utilizing a first and second range strategy to ensure continuous map information construction even during temporary communication failures, with a first range for immediate use and a second range for backup, and includes a high-precision local map for fallback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the system relies on real-time communication with the center device for map information, then the map information can be kept updated, but the system becomes vulnerable to communication disruptions and interruptions
Solution Approach 1:
The system pre-downloads map information from a second range (wider area) in advance and stores it locally before it is needed. This preliminary action ensures that when communication with the center device is disrupted, the system already has backup map data available, eliminating the vulnerability to communication interruptions while maintaining reliability.
Solution Approach 2:
The system divides map information storage into two distinct quality levels: first range map information (narrower area, higher priority) and second range map information (wider area, backup). This local quality differentiation allows the system to optimize resource allocation, using the smaller first range for active construction and the larger second range as backup, resolving the complexity issue through structured organization.
2Reliability
If the system downloads map information from a wider area (second range), then it can provide backup during communication failures, but the data transmission time and bandwidth increase
Solution Approach 1:
The system performs the time-consuming download of second range map information in advance, before communication failures occur. By completing this preliminary action during normal communication conditions, the system prepares backup data without adding time pressure during critical failure scenarios, thus resolving the time loss issue.
Solution Approach 2:
The system downloads more map information than immediately needed (excessive action by downloading second range in addition to first range), but this excess is performed incrementally and in advance. The partial nature of progressive downloads balances the excessive total data volume with manageable time investment spread over multiple sessions.
3Productivity
If the system uses only the minimum necessary map information for current position, then the processing load is reduced, but the system cannot handle communication disruptions
Solution Approach 1:
The system segments map information into functional parts: first range map information for immediate construction needs and second range map information for backup. This segmentation allows the system to process only the essential first range data for high productivity while maintaining the second range as a separate, readily-available backup that activates only when needed, thus resolving the reliability issue without permanently increasing processing load.
Solution Approach 2:
The system prepares backup map information from the second range in advance during normal operations. This preliminary preparation ensures that when communication failures occur, the backup data is already processed and ready for immediate use, maintaining productivity during failures without requiring increased real-time processing capacity.
Data Source
AI summary
A map information output device including a map information output unit that outputs control map information for automatic driving control of a vehicle to an automatic driving control unit The map information output device includes: a map storage unit storing an original map for constructing the control map information; a position obtainer obtaining a current position of the vehicle; a map information constructor sequentially constructing the control map information based on the original map of a first range determined with reference to the current position obtained by the position obtainer; and a download processor downloading and storing the original map of a second range, which is a range determined based on the current position and includes the first range, sequentially from a map distribution device outside the vehicle by wireless communication.