Route Search Device Using Weather-Statistical Link Analysis
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Solution Overview
Problem
Existing automobile navigation systems rely on weather forecast information, which can lead to inaccurate route searches and travel time estimates if the forecast differs from actual weather conditions, making the system complex and less accurate.
Innovation Solution
A route search device that uses only statistical traffic information based on weather conditions to find a route with minimal variation in travel time, without relying on weather forecast information, by classifying and storing travel times for each link under different weather conditions and identifying the link series with the smallest variation in required travel time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If weather forecast information is used for route search, then the system can provide weather-aware routing, but the system complexity increases and accuracy decreases when forecast differs from actual weather
Solution Approach 1:
The patent extracts and removes the weather forecast information acquisition module (communication device and sensor device) from the in-vehicle terminal system. Instead of using external weather forecasts, the system relies solely on statistical traffic information that has been pre-classified by weather conditions, thereby eliminating the complexity of external data acquisition while maintaining weather-aware routing capability
Solution Approach 2:
The patent applies preliminary action by pre-classifying and storing statistical traffic information according to different weather conditions (fine weather, cloudy weather, rainy weather, snowy weather) before actual route search. This pre-organized data structure allows the system to quickly select appropriate traffic patterns based on current weather without needing real-time weather forecasts, thus reducing system complexity while maintaining adaptability
2Adaptability or versatility
If weather forecast information is referred to during route search, then weather-aware routing is achieved, but accuracy decreases when forecast differs from actual weather conditions
Solution Approach 1:
The patent uses copying by creating statistical models that represent typical traffic patterns for each weather condition. Instead of relying on potentially inaccurate real-time weather forecasts, the system copies historical traffic data organized by weather conditions and uses these statistical representations to predict traffic patterns, thereby improving reliability while maintaining weather adaptability
Solution Approach 2:
The patent replaces the expensive and unreliable weather forecast information with cheaper, more reliable statistical traffic information that is already organized by weather conditions. This statistical data serves as a disposable, pre-processed resource that can be quickly consulted without the risks associated with weather forecast accuracy
3Adaptability or versatility
If communication device and sensor device are added to obtain weather information, then weather-aware routing is enabled, but device complexity increases
Solution Approach 1:
The patent extracts and removes the communication device and sensor device from the in-vehicle terminal configuration. The system achieves weather-aware routing solely through statistical traffic information that is pre-classified by weather conditions, eliminating the need for external weather data acquisition hardware and reducing system complexity
Solution Approach 2:
The patent applies self-service by having the system use its own internal statistical traffic information database that is already organized by weather conditions. Instead of relying on external weather data sources requiring communication and sensing devices, the system serves its own routing needs using pre-processed traffic statistics, thereby reducing device complexity while maintaining weather adaptability
Data Source
AI summary
A route to a destination in which required travel time barely varies depending on weather is searched for without referring to weather forecast or weather information. A route search device comprises following means: a storage medium for storing traffic information including travel times by weather conditions for each link comprising a road on a map; a pointing device which sets a starting point and a destination; a weather condition-based route search module that determines the shortest travel time route from the starting point to the destination by weather conditions using the traffic information stored in the storage medium; a link series-identifying module that extracts link series which vary with weather conditions from link series comprising the shortest travel time route determined by the weather condition-based route search module, determines the required travel time by weather conditions for the each link series that vary with weather conditions by using the traffic information stored in the storage medium, and identifies a link series whose required travel time barely varies depending on weather conditions; and a link series-registering medium that registers the link series identified by the link series-identifying module as a link series comprising a guide route from the starting point to the destination.