JPH06162395A - Automobile navigation system - Google Patents

Abstract

PURPOSE:To provide the automobile navigation system displaying the optimum route corresponding to the road state at this point of time to an automobile when a user using the navigation system inputs an object point. CONSTITUTION:The system is provided with a present location specification means 1 specifying the present location of the automobile, objective point input means 2 inputting the objective point of the automobile, road monitoring means 8 monitoring the road state and outputting the information, route judgement means 9 judging the optimum route to the objective point based on the present location, objective point and the information of the road state, and route display means 3 displaying the judged route. Therefore, when a user inputs an objective point, the optimum route from the present location to the objective point is displayed basing on the road state at the point of time. Thus, the effective navigation for the road state being always changing can be performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle navigation system for determining and displaying an optimum route from a present location to a destination by a user inputting a destination, for example, navigation of an emergency vehicle. It is used in the system.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional automobile navigation system. This system uses a current location specifying unit 1 typified by GPS and a destination input unit 2 typified by a touch panel to input a current location and a destination, and uses only fixed map information. Then, the route is determined by the route determination means 9 and displayed by the route display means 3. However, in such a system, since only the map information with the fixed judgment criterion is used, the same route is required in any case as long as the present location and the destination are the same. For this reason, it is not possible to respond to constantly changing road conditions, and the requested route may be inefficient in terms of time and economy.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and its purpose is to allow a user using a navigation system to input a destination at that time. An object of the present invention is to provide an automobile navigation system capable of displaying an optimum route corresponding to the road condition in.

[0004]

In the automobile navigation system of the present invention, in order to solve the above-mentioned problems, as shown in FIG. 1, a present position specifying means 1 for specifying the present position of a car C and a car. Destination input means 2 for inputting the destination, road monitoring means 8 for monitoring the road condition and outputting the information, and determining the optimum route to the destination based on the current position, the destination, and the road condition information. Route determination means 9
And a route display means 3 for displaying the determined route. In the system of FIG. 1, the information on the current location and the destination is transmitted from the transmission means 4 on the automobile side to the reception means 6 of the host station H, and the optimum information obtained by the route determination means 9 provided in the host station. Although the route information is transmitted from the transmitting means 7 of the host station to the receiving means 5 on the automobile side, the route determining means 9 is provided on the automobile side,
The road condition information may be received from the outside.

[0005]

The operation of the present invention will be described below with respect to the system shown in FIG. When the user inputs a desired destination using the destination input means 2, the transmission means 4 on the automobile side sends the destination information to the host station together with the current location information of the automobile at that time obtained by the present location specifying means 1. It transmits to the receiving means 6. Based on the road condition as the judgment factor data sent from the road monitoring means 8 to the host station, the route judging means 9 finds the optimum route from the current position of the vehicle to the destination on the basis of a predetermined judgment criterion. The result is transmitted to the receiving means 5 on the automobile side as a mobile station using the transmitting means 7 of the host station. As a result, the automobile can use the route display means 3 to display an optimal route according to the road conditions at that time.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 2 is an overall configuration diagram of an embodiment of the present invention. The current position specifying means 1 has a function of specifying the position of the automobile and a function of transmitting the current position information to the transmitting means 4, and for example, G receives position information from an artificial satellite.
It is configured using PS. Further, the destination input means 2 has a function of allowing the user to input a certain point on the map and the transmission means 4
Is equipped with a function of transmitting destination information to, for example, a touch sensor panel on the display, and the destination information can be displayed by pointing a certain part on the map displayed on the same display. It is something to enter. The route display means 3 has a function of displaying the optimum route sent from the host station via the transmitting means 7 and the receiving means 5 on the same display. The transmitting means 4 and the receiving means 6 have a function of transmitting the current location information and the destination information from the automobile side to the route determining means 9 of the host station. Signal transmission between the transmitting means 4 and the receiving means 6 and between the transmitting means 7 and the receiving means 5 is performed wirelessly. The road monitoring means 8 has a function of digitizing the congestion state of the road as judgment element data and transmitting it to the route judgment means 9, and is constituted by, for example, a traffic volume sensor system.
The route judging means 9 has a function of receiving the current position information / destination information from the receiving means 6 and the judgment factor data from the road monitoring means 8 as an input, and outputting the optimum route according to a predetermined judgment criterion. An example of the algorithm is shown in FIG.

In FIG. 3, Ci (i = 1, 2, 3,
4) is the congestion degree of the section (i), which is defined as the time required to advance the unit distance in the section (i) where the distance is Li. The arrival time T to the destination is T = Σ (Ci ×
Li), which is used as a criterion in the route determining means 9. In the case of FIG. 3, when going through the section (1, 2) from the current location to the destination, the arrival time to the destination is T (1, 2) = 8 ×
2.5 + 6 × 2.5 = 35, and when passing through the section (3,4), the arrival time to the destination is T (3,4).
4) = 4 × 1.5 + 5.5 × 4.5 = 30.75. Therefore, it can be determined that the optimum route is a route passing through the sections (3) and (4).

Although the route determining means is provided on the host station side in this embodiment, the route determining means may be provided on the automobile side. In this case, the vehicle side receives information about the congestion situation of the road from the outside or information about the closed sections during construction by wireless transmission, and the route determination means on the vehicle side determines and displays the optimum route. .

[0009]

According to the present invention, when the user inputs a destination, the optimum route from the current position to the destination is displayed based on the road condition at that time, so that the road condition is constantly changing. There is an advantage that efficient navigation can be performed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a basic configuration of the present invention.

FIG. 2 is a schematic configuration diagram of an embodiment of the present invention.

FIG. 3 is an explanatory diagram illustrating an example of the judgment criteria of the route judgment means used in the present invention.

FIG. 4 is a block diagram showing a configuration of a conventional automobile navigation system.

[Explanation of symbols]

 1 present location specifying means 2 destination input means 3 route display means 4 transmitting means 5 receiving means 6 receiving means 7 transmitting means 8 road monitoring means 9 route judging means C mobile station (automobile) H host station

Claims (2)

[Claims] 1. A present location identifying means for identifying a present location of an automobile, and a destination inputting means for entering a destination of the automobile.
Road monitoring means for monitoring the road condition and outputting the information,
An automobile navigation system comprising: route determination means for determining an optimal route to a destination based on information on a current location, a destination, and road conditions; and route display means for displaying the determined route. 2. The road condition information is congestion degree information indicating a time required to travel a unit distance of a passage section, and the route determination means is calculated as a product of the congestion degree and the distance of the passage section. 2. The vehicle navigation system according to claim 1, further comprising means for determining a route having a shortest arrival time from the current position to the destination as an optimum route.