In-Vehicle Map Update Zone Ordering
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Solution Overview
Problem
Existing map updating systems do not account for the use of a map before its completion, leading to potential adverse effects from incomplete updates when screen information is generated.
Innovation Solution
An in-vehicle device with a storage unit for map information divided into zones, a map drawing unit, a difference detecting unit to calculate a difference evaluation value, and a map updating unit that determines the order of updating zones based on this value to ensure complete updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If zones are updated in arbitrary order, then update process is simple, but screen information may be generated using incomplete map data causing navigation errors
Solution Approach 1:
The patent applies preliminary action by calculating difference evaluation values for all zones before the update process begins. This pre-calculation establishes the update sequence in advance, ensuring that zones are updated in the correct order (from largest to smallest difference) without requiring complex real-time decisions during the update process. The difference detecting unit computes these values beforehand, and the map updating unit follows this predetermined sequence, thus maintaining reliability while avoiding operational complexity.
Solution Approach 2:
The patent segments the map data into multiple zones and applies different update priorities to each segment based on their difference evaluation values. By dividing the map into zones and updating them sequentially from highest to lowest difference, the system ensures that critical areas (with large differences) are updated first, preventing navigation errors while maintaining a manageable update process through systematic segmentation.
2Reliability
If all zones are updated completely before screen information is generated, then data accuracy is improved, but update time increases
Solution Approach 1:
The patent uses preliminary action by pre-calculating difference evaluation values for all zones before the update process. This allows the system to determine the optimal update sequence in advance, updating zones with the largest differences first. This approach ensures that the most critical updates are completed promptly, reducing the time the system operates with incomplete data, while still maintaining a systematic approach to full update completion.
Solution Approach 2:
The patent applies partial action by updating zones sequentially based on their difference evaluation values rather than requiring all zones to be completely updated before any screen information is generated. The system can generate screen information after updating the most critical zones (those with largest differences), providing a balance between data accuracy and time efficiency, rather than waiting for exhaustive completion of all zone updates.
3Measurement precision
If zones with large differences are updated first, then navigation accuracy is improved, but update processing complexity increases
Solution Approach 1:
The patent segments the map into multiple zones and calculates difference evaluation values for each segment independently. This segmentation allows the system to identify and prioritize zones with large differences without requiring complex global analysis. Each zone is evaluated separately, and the results are sorted to determine update order, making the process manageable through systematic division rather than overwhelming complexity.
Solution Approach 2:
The patent uses parameter changes by introducing difference evaluation values as a quantitative metric to determine update priority. Instead of using arbitrary or geographic ordering, the system transforms the update decision into a parameter-based selection process, where zones are sorted and updated according to their calculated difference values. This parameter-driven approach improves navigation accuracy while maintaining processing efficiency through objective criteria.
Data Source
AI summary
An in-vehicle device includes: a storage unit storing map information divided into zones and used at least for screen display; a map drawing unit generating screen information using the map information; a difference detecting unit calculating, as a difference evaluation value, a magnitude of a difference in zone between the map information before update and the map information after update; and a map updating unit determining an order of updating the zones on a basis of a magnitude of the difference evaluation value to update, for each of the zones, the map information stored in the storage unit.