JPH0571974A - On-vehicle navigation system - Google Patents

Abstract

PURPOSE:To obtain the title device capable of issuing a replenishing command of fuel on a road map during the running on the route up to one's destination. CONSTITUTION:A navigation system has a gasoline station data storage part 2c storing the data related to gasoline stations all over the country, a runnable distance calculating part 8 calculating a runnable distance, a gasoline station extracting part 20 extracting gasoline stations on the route up to one's destination during the running on the route when the residual amount of fuel is a predetermined value or less and a fuel replenishing command issuing part 21 issuing a replenishing command of fuel in the gasoline station extracted by the gasoline station extracting part 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle-mounted navigation system, and more specifically, it detects a current position based on a cumulative distance and a cumulative azimuth associated with traveling and displays the current position on a road map. The present invention relates to a vehicle-mounted navigation system.

[0002]

2. Description of the Related Art An on-vehicle navigation system displays the current position of a vehicle on a road map to facilitate traveling on a strange land or at night.

A conventional vehicle-mounted navigation system of this type is disclosed in, for example, Japanese Patent Laid-Open No. 61-2313719, which discloses a travelable distance in Japanese Patent Publication No. 63-4417.
No. 8 publication.

FIG. 4 is a block diagram of a conventional vehicle-mounted navigation system. In FIG. 4, 1 is an operation input unit for setting destinations and inputting operations, 2 is a road network that stores information about all road networks from general roads to highways, and all road segments that make up all road networks. Storage unit, 3
Is a direction sensor that detects the traveling direction of the vehicle based on the geomagnetism, and 4 is a wheel speed sensor that generates a pulse according to the rotation speed of the wheel.

Reference numeral 5 is the direction sensor 3 and the wheel speed sensor 4 described above.
Signal output from the road network storage unit 2b for calculating the current position
A current position calculation unit for calculating the current position of the vehicle from the road network data stored in the unit 7, a fuel remaining amount detection unit 7 for detecting the fuel remaining amount in the fuel tank, and 8 for the fuel remaining amount detection unit 7 and the wheel speed. A travelable distance calculation unit that calculates a travelable distance based on a signal output from the sensor 4, a display unit 9 that displays information such as a road map and the current position of the vehicle, and a display control unit 10
Reference numeral 50 is a main control unit that controls these systems.

In the vehicle-mounted navigation system thus configured, the current position calculation unit 5 calculates the integrated azimuth from the signal output from the azimuth sensor 3 and the integrated distance from the signal output from the wheel speed sensor 4, These accumulated directions,
The current position of the vehicle is calculated from the road network data stored in the road network storage unit 2b for calculating the accumulated distance and the current position.

The travelable distance calculation unit 8 is a remaining fuel amount detection unit 7.
And the average fuel consumption from the signal output from the wheel speed sensor 4,
The remaining fuel amount is calculated, and the travelable distance is calculated from the average fuel consumption and the remaining fuel amount. The main control unit 50 inputs the current position output from the current position calculation unit 5 and the travelable distance output from the travelable distance calculation unit 8, and the display control unit based on the operation signal output from the operation input unit 1. The display instruction of the current position and the travelable distance is given to 10 and the system is controlled.

[0008]

Since the conventional vehicle-mounted navigation system is constructed as described above, it is possible to efficiently drive the vehicle by refueling it at any gas station, even if the remaining fuel amount becomes low during traveling. There was a problem that the driver became uneasy and could not concentrate on driving because he did not know if he could do it.

The present invention has been made in order to solve the above-mentioned problems, and even if the fuel remaining amount decreases while traveling on a route to a destination, the driver can drive safely and efficiently without being rushed. It is an object of the present invention to provide a vehicle-mounted navigation system that enables the following.

[0010]

A vehicle-mounted navigation system according to the present invention has a destination designating means for designating a destination, a road network storage means, and a current position detecting means. In a vehicle-mounted navigation system configured to display a destination and a route to a destination on a road map, a gas station information storage unit that stores information about a position of a gas station, a fuel that detects a fuel remaining amount in a fuel tank Remaining amount detection means, travelable distance calculation means for calculating the travelable distance from the traveled distance and remaining fuel amount, gasoline within the travelable distance calculated by the travelable distance calculation means and on the route to the destination It has a gas station extraction means for extracting the station from the gas station information storage means, and while traveling on the route to the destination. When the remaining fuel amount detected by the remaining fuel amount detecting means is less than or equal to a predetermined value, a fuel replenishing instruction means for displaying an instruction for refueling at the gas station extracted from the gas station extracting means on the road map. It is equipped with.

[0011]

In the vehicle-mounted navigation system according to the present invention, when the remaining fuel amount detected by the remaining fuel amount detecting means becomes equal to or less than the predetermined value while traveling on the route to the destination, the means for extracting gas station information from the gas station information extracting means. It is instructed to refuel at the gas station extracted by, and the vehicle can travel efficiently.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. The figure is a block diagram of a vehicle-mounted navigation system of the present invention. In FIG. 1, reference numeral 1 is an operation input unit for setting a destination and inputting an operation, and 2a is used for a route search of an entire road network from a general road to an expressway and all road segments constituting the entire road network. A route search road network storage unit that stores information, and a current position calculation unit 2b that stores information used to calculate the current positions of all road networks from general roads to highways and all road segments that make up all road networks The road network storage unit 2c is a gas station information storage unit that stores information about the positions of gas stations nationwide.

Reference numeral 3 denotes an azimuth sensor for detecting the traveling azimuth of the vehicle based on the geomagnetism, 4 is a wheel speed sensor for generating a pulse corresponding to the rotation speed of the wheel, and 5 is output from the azimuth sensor 3 and the wheel speed sensor 4. Current position calculation unit for calculating the current position of the vehicle from the signal indicating the current position and the road network data stored in the current position calculation road network storage unit 2b, and 6 is the operation input unit 1
A route search unit that searches for a route to reach the destination from the destination set in step 1, the current position output from the current position calculation unit 5, and the road network data stored in the route search road network storage unit 2a; Reference numeral 7 is a remaining fuel amount detecting unit for detecting the remaining amount of fuel in the fuel tank, 8 is a travelable distance calculating unit for calculating a travelable distance based on signals output from the fuel remaining amount detecting unit 7 and the wheel speed sensor 4, Reference numeral 9 is a display unit for displaying information such as a road map and the current position of the vehicle, and 10 is a display control unit.

Reference numeral 20 denotes the current position of the vehicle output from the current position calculation unit 5, the travelable distance of the vehicle output from the travelable distance calculation unit 8, the route to the destination output from the route search unit 6, and A gas station extraction unit that extracts gas stations located within the mileage of the vehicle and on the route to the destination from the position information of the gas stations nationwide stored in the gas station information storage unit 2c, 21 is the gas station extraction A refueling instruction unit that gives a refueling instruction based on gas station information on the route to the destination, which is output from the unit 20, within the vehicle travel distance,
Reference numeral 50 is a main control unit that controls these systems.

Next, the operation relating to the fuel supply instruction control of the vehicle-mounted navigation system of the above embodiment will be described with reference to FIG. FIG. 2 is a flowchart showing the operation of the vehicle-mounted navigation system according to the present invention.

In FIG. 2, first, at step 101, it is determined whether or not the vehicle is traveling on a route to a destination. If the vehicle is traveling on a route to the destination, then at step 102, it is determined whether or not the remaining fuel amount is below a predetermined value. If it is less than the predetermined value, the travelable distance is calculated in step 103, and step 104
At, a gas station within the travelable distance and on the route to the destination is extracted, and in step 105, a fuel supply instruction is given on the road map. If the fuel is not less than the predetermined value in step 102, steps 103 to 105 are not executed.

Further, unless the vehicle is traveling on the route to the destination in step 101, steps 102 to 105 are not executed. FIG. 3 is a view of the display screen of the fuel supply instruction in step 105 of FIG. 2, where 11 is the current position of the vehicle on the road map and 12 is the gas station on the route.

The above embodiment is an example of a vehicle-mounted navigation system having a current position detecting means for detecting the current position based on the accumulated distance and the accumulated azimuth associated with traveling. (Global Pos
itioning system) for detecting an absolute position, and for detecting the current position based on the integrated distance and integrated azimuth and for detecting the absolute position.

[0019]

As described above, the vehicle-mounted navigation system according to the present invention measures the fuel remaining amount by the signal output from the fuel remaining amount detecting unit while traveling on the route to the destination, and the fuel remaining amount is If the value is less than or equal to the predetermined value, the travelable distance calculation unit calculates the travelable distance, and the gas stations within the travelable distance and on the route to the destination are extracted from the gas station information storage unit and extracted. Equipped with a refueling instruction section that gives instructions on the road map to refuel at the gas station, even if the fuel level becomes low while driving on the route to the destination, the driver will not be rushed and will be safe and efficient. It has the effect of being able to drive.

[Brief description of drawings]

FIG. 1 is an overall block diagram showing an embodiment of a vehicle-mounted navigation system according to the present invention.

FIG. 2 is a flowchart showing an operation relating to refueling instruction control of the vehicle-mounted navigation system according to the present invention.

FIG. 3 is a view of a display screen of a fuel supply instruction of the vehicle-mounted navigation system according to the present invention.

FIG. 4 is an overall block diagram showing an example of a conventional vehicle-mounted navigation system.

[Explanation of symbols]

 1 Operation Input Unit 2a Route Search Road Network Storage Unit 2b Current Position Calculation Road Network Storage Unit 2c Gas Station Information Storage Unit 3 Direction Sensor 4 Wheel Speed Sensor 5 Current Position Calculation Unit 6 Route Search Unit 7 Fuel Level Detection Unit 8 Driving distance calculation unit 9 Display unit 10 Display control unit 20 Gas station extraction unit 21 Refueling instruction unit 50 Main control unit

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[Procedure amendment]

[Submission date] June 15, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a vehicle-mounted navigation system of the present invention. In FIG. 1, reference numeral 1 is an operation input unit for setting a destination and inputting an operation, and 2a is used for a route search of an entire road network from a general road to an expressway and all road segments constituting the entire road network. A route search road network storage unit that stores information, and a current position calculation unit 2b that stores information used to calculate the current positions of all road networks from general roads to highways and all road segments that make up all road networks The road network storage unit 2c is a gas station information storage unit that stores information about the positions of gas stations nationwide.

Front page continued (72) Inventor Hirofumi Goto 2-33 Miwa, Mita City, Hyogo Prefecture Mitsubishi Electric Corporation Mita Works (72) Inventor Katsuro Hayamizu 2-33 Miwa, Mita City, Hyogo Prefecture Mitsubishi Electric Machine Co., Ltd. Mita Works (72) Inventor Tomoda Yoshida 2-33 Miwa, Mita City, Hyogo Prefecture Mitsubishi Electric Co., Ltd. Mita Works

Claims (1)

[Claims] 1. A destination designation means for designating a destination, a road network storage means, and a current position detection means, and the current position, the destination, and the route to the destination are displayed on a road map. In the in-vehicle navigation system configured to do so, the gas station information storage means for storing information about the position of the gas station, the fuel remaining amount detection means for detecting the remaining fuel amount in the fuel tank, the traveling distance and the remaining fuel amount can be traveled. Driving distance calculating means for calculating a distance, and gas station extraction for extracting from the gas station information storage means a gas station existing within the driving distance calculated by the driving distance calculating means and on the route to the destination If the fuel remaining amount detected by the fuel remaining amount detecting means is below a predetermined value while traveling on a route to the destination, In this case, the vehicle-mounted navigation system is provided with a fuel supply instruction means for displaying an instruction to refuel at the gas station extracted from the gas station extraction means on a road map.