On-vehicle path guide apparatus and path search method

Abstract

The existent problem is that when a recommended route from the present position to the destination is explored, the steward needs to wait for a long time, besides the operation and storage need a large-capacity memory, which makes the route guiding device for vehicles have a high cost. The solution is that by using network data and index data for route search, an exploration device of index data for route search explores the recommended route from the present position to the preset destination by stages at a high speed and guides the steward. According to the distance to the destination, the data is selected to explore the recommended route efficiently. Moreover, the index data for route search is layered and has a small-capacity memory.

Description

technical field [0001] The present invention relates to a vehicle route guidance device and a route search method for searching and displaying a recommended route between a current position and a destination at high speed on a map displayed on a display device such as a liquid crystal display or a CRT. Background technique [0002] Fig. 41 is a block diagram of a conventional route guidance device for vehicles, for example, the device disclosed in JP-A-2-28800. In the figure, the processing unit 411 is composed of a microcomputer including a CPU 417 , a ROM 418 , a RAM 419 , and an input / output interface 420 , and these components are connected to each other via a bus 421 . [0003] The traffic information receiver 412 receives road traffic information and the like transmitted from the traffic information center through a transmitter installed on a route guide board, a signal pole, or the like. The compact disk display 413 is used as an external storage device for reading o...

AI Technical Summary

Problems solved by technology

[0005] Since the conventional route guidance device for a vehicle is structured as above, it is necessary to search for a route based on the width of the road defined by the road map data, the length of the road in each section, and the type of road (urban road, highway, etc.) There is a problem that it takes a long time until the recommended route to the destination is provided to the flight attendant to calculate the route cost of all the candidate routes based on the data.

[0006] In addition, since the recommended route is selected based on the calculation results of all roads, it takes time before the recommended route is presented.

As a result, it takes a long time to wait from the time when the flight attendant makes a request to when the result is obtained, and there is a problem of inconvenience

[0007] Furthermore, in order to calculate the recommended route, it is necessary to store the calculation results of all alternative routes, which requires a relatively large capacity memory, which is one of the important reasons for the high price of the route guidance device for vehicles.

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