JPH02154111A - Path guiding device for automobile of the like - Google Patents

Abstract

PURPOSE:To accurately perform the guidance of a path by using the name of main intersection on a map memory in a path guiding means for an automobile. CONSTITUTION:A current position detection part 7 detects the current position of the automobile from an output signal from an input circuit 3 and the data of the map memory 6 and a next intersection detection part 8 detects a next intersection with the data from the memory 6 and the signal from the detection part 7. A decision part 9 of a distance to the next intersection decides the distance to the next intersection or arrival time by detecting that it is equal to or below threshold with a next intersection detecting signal. When the decision part 9 decides that it is equal to or below the threshold, the designation for next action, for example, the name of the intersection and an advancing direction, is performed by a CRT 12 and a speaker 13. By inputting a destination from a keyboard 5 when the guidance of the path is started, an optimum path is guided by a control circuit 4 and the name of the main intersection is extracted. Since the guidance of the path is performed by using the name of the intersection, it is accurately judged that the current position during driving is within a certain range.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a route guidance device used for in-vehicle navigation and the like.

2. Description of the Related Art Conventionally, this type of route guidance device has a direction sensor 15, a vehicle speed sensor 16, and an input circuit 17 for these, as shown in FIG.
It is equipped with a processing control circuit 18 for these signals, a navigation map memory 21 and its display CRT 20, a keyboard 19 for inputting information, and a radio 22 for inputting traffic information. By knowing your current location on the map, you can be guided along the route to your destination. That is, after the power is turned on, a destination is first entered using the keyboard 19, and the navigation system is started. After inputting the destination, the control circuit 18 stores the map memory 2.
1, a route between the current location and the destination is derived. For this route, enter traffic information, distance, time, etc. on the keyboard 19.
It is determined automatically by human selection. The derived route is displayed on CR"r" 20J2 (Figure 3).

Next, when the vehicle starts moving along the route, the current position will be traced on the CRT, and when the current position approaches an intersection, the intersection will be indicated by a voice or an arrow on the CRT J:, for example, saying [Please turn left]. display and guide the car.

Problems to be Solved by the Invention However, with the above-mentioned conventional in-vehicle navigation devices, the accuracy of the current position is poor, and the current intersection and the actual vehicle position may deviate, making it impossible to provide correct intersection guidance or There were problems such as providing directions at different locations or at different intersections.

The present invention solves these conventional problems and provides an excellent route guidance device that can provide accurate route guidance.

Means for Solving the Problems In order to achieve the above object, the present invention provides a sensor that determines the position of a vehicle such as a direction sensor and a vehicle speed sensor, a control circuit that detects the position from a sensor signal, and a map that includes intersection names. It is equipped with a memory, a keyboard for manually inputting the destination, and a control circuit for determining the route to the destination, and also has means for extracting the name of any intersection leading to the destination, and detecting the name of the next intersection based on the current position. A means for determining that the upper and first intersections and the current position satisfy arbitrary conditions, and when the next intersection and the current position satisfy the specified conditions, the next intersection name and direction of travel are presented. The system is equipped with an upper stage, and the result of determining the position of the next intersection can be displayed on the screen or a synthetic voice can be used to indicate the direction of travel along with the name of the intersection.

Since the present invention adopts the above-described configuration, it is possible to know one's current position with arbitrary precision, know the names of secondary intersections on the route to the destination, and be able to pass through the intersection. Specifically, since route guidance can be performed based on intersection names, accurate route guidance can be provided.

Embodiment FIG. 1 shows an embodiment of a route guidance device according to the present invention.

1 is a direction sensor that detects geomagnetism; 2 is a vehicle speed sensor that detects the speed of the vehicle; and 3 is an input circuit through which direction data from the direction sensor 1, vehicle speed data from the vehicle speed sensor 2, and other sensor signals are transmitted through signal lines. It plays the role of converting each signal to the control circuit 4 as a logic signal δ1. 5 is a keyboard for inputting information, and 6 is a map memory.

The control circuit 4 includes a current position detection section 7, a next departure point detection section 8, a next intersection distance determination section 9, a display control circuit 10. It has a voice control circuit 11 and controls the determination, processing, display output, etc. of sensor signals and keyboard input signals.

The current position detection unit 7 detects the current position of the vehicle from the output signal of the input circuit 3 and the data from the map memory 6, and the next departure point detection unit 8 uses the data from the map memory 6 and the signal from the current position detection unit 7 to detect the current position of the vehicle. The zero-order intersection distance determination unit 9 that detects the next intersection makes a determination by detecting whether the distance or arrival time to the next intersection is less than a certain threshold value based on the law difference point detection signal. . 12 is a CRT connected to the display control circuit 10, 13 is a speaker connected to the audio control circuit 11, and CRT+2 and speaker I3 are used to perform the next action, for example, when the judgment of the distance judgment section 9 is below the critical value.
Instruct the intersection name and direction of travel. 14 is a radio device.

As mentioned above, when the present invention starts route guidance, when a destination is entered from the keyboard, the control circuit derives an optimal route, extracts the names of major intersections, and guides the route using these intersection names, so the route guidance is performed while driving. It can be accurately determined that the current position of is within a certain range. Therefore, it is possible to sequentially detect intersections and provide route guidance to the driver based on the (-1 noun) of the intersection.

Map memory for vehicle route guidance means as described in Effects of the invention" 2-1
By using important intersection names, each time the vehicle approaches an important intersection as the vehicle progresses, it is possible to instruct the driver on the intersection name and the direction of travel using the CRT or voice. The instructions allow the driver to accurately determine the location and drive smoothly without having to swerve through intersections.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the route guidance device for vehicles etc. according to the present invention, Fig. 2 is a block diagram of a conventional product, and Fig. 3 is a display example of a CRT display in the conventional device. It is a front view. l... Orientation sensor 2... Vehicle speed sensor 3... Input circuit 4... Control circuit 5... Keyboard 6
...Map memory 7...Current position detection section 8...
Legal text difference point detection unit 9... Legal text difference point distance determination unit 10.
...Display control circuit 11...Tfi, jJ control circuit
12...CRT13...Speaker Figure 1

Claims (1)

[Claims] (1) Sensors that determine the position of the vehicle such as a direction sensor and vehicle speed sensor, a control circuit that detects the position from sensor signals, a map memory that includes intersection names, a keyboard that inputs the destination, and a A control circuit for determining a route, a means for extracting an arbitrary intersection name to a destination, a means for detecting the next intersection name from the current position, and a means for detecting the next intersection name and the current position satisfying arbitrary conditions. A route guidance device for automobiles, etc., comprising means for determining whether the next intersection and the current position have met specified conditions, and means for presenting the name of the next intersection and the direction of travel when the next intersection and current position satisfy prescribed conditions.