JP3716269B2 - Navigation device - Google Patents

Description

  The present invention relates to a navigation device that outputs guidance as a route guidance device.

  In general, a so-called self-contained navigation device is known as a positioning device for various moving bodies such as automobiles, airplanes, and ships. This self-contained navigation device obtains a two-dimensional displacement (vector quantity) of a moving body from the azimuth data from the azimuth sensor and the velocity data from the velocity sensor, and integrates the two-dimensional displacement with a reference point to obtain the current position. It is what you want. That is, for example, in the case of an automobile, the number of pulses generated during one rotation of the drive shaft is set in advance, and the distance calculated from the total number of pulses generated from the reference point to the current position is multiplied by the distance correction coefficient. The mileage was required.

  Also, a GPS (Global Positioning System) type navigation device has been developed as a positioning device using an artificial satellite. This GPS type navigation device normally receives radio waves from three or more GPS satellites, and includes pseudorange data including the time offset of the receiver between each GPS satellite and the receiving point, and position data of each GPS satellite. The current position of the reception point is calculated, the map data including the calculated current position is read from the map data storage device by the information processing device, the data is taken in, and the screen data is obtained from the acquired map data and the current position information. Is sent to a display device to display an image. From this image, a car driver or the like who is a user can grasp his / her current position in association with the map.

  In any of the above navigation devices, the current position and the target position are overlapped with a map on the screen of the display device so as to be recognized visually.

On the other hand, there is known a navigation device that does not perform route guidance on the screen of a display device but outputs a voice message before entering a right or left turn such as an intersection to perform route guidance.
Japanese Utility Model Publication No.4-115085

  In a conventional voice navigation guidance type navigation device, for example, the following operation is performed. Now, referring to FIG. 7, it is assumed that the moving body heads from the start point P1 to the final destination point Pn via the right and left turn points P2, P3, P4, P5. In this movement process, as shown in FIG. 8, if the moving body reaches the position C1, and the right / left turning point P3 exists in the approach detection range at this time, a voice message “Soon a right turn” is output. Is done. This voice message indicates that the driver should make a “right turn” at the right / left turn point P3.

  However, in the conventional navigation device, as shown in FIG. 8, after outputting a travel guidance message for the right / left turning point P3 at the position C1, the next right / left turn is performed at a position that has not yet passed the right / left turning point P3. The approach to the point P4 may be detected, and there is a possibility that the voice message “turning to the left soon” regarding the right / left turn point P4 may be output before the right / left turn point P3. This is due to the detection accuracy of the approach distance, but is particularly likely to occur when the right and left turning points are approaching each other.

  When such an erroneous voice message is output, as shown by a broken line arrow in FIG. 8, it should originally be turned right as indicated by R, but left turn as indicated by L ′ by an immediately preceding voice message. There was a risk of doing so.

  Accordingly, an object of the present invention is to provide a navigation device that can transmit a guidance message about the next right / left turning point different from the right / left turning point before passing the right / left turning point to be passed without confusion.

The present invention, in the process of moving body moves a moving path including a plurality of right or left turn point, a navigation device having a route guidance output means for output the progression guidance messages left or right turn point, the route guidance output means Determines whether or not to output a progress guidance message for another right / left turning point after outputting the next guidance message for the right / left turning point that the mobile body should pass next. When it is determined that a guidance message is to be output, it is determined whether or not the moving body has passed the right / left turning point to be passed next, and the moving body has passed the right / left turning point to be passed next. When it is determined that the information does not exist, a progress guidance message using a different expression from the progress guidance message of the right / left turning point to be passed next is output.

Further, the present invention is the navigation device according to claim 1 , wherein the route guidance output means includes a progress guidance message of the left and right turning points to be passed next and a progress guidance message using the different expressions . It is characterized in that the output is performed so that the representation of the part not meaning the traveling direction is different from each other.

  Next, embodiments of the present invention will be described with reference to the drawings.

[I] First Embodiment FIG. 1 is a block diagram showing a basic configuration when the present invention is applied to an in-vehicle navigation system.
This in-vehicle navigation system detects a rotational speed of a shaft, a geomagnetic sensor 1 that outputs direction data of the traveling direction of the own vehicle, an angular velocity sensor 2 that detects angular velocity when the own vehicle rotates and outputs angular velocity data, and a shaft rotation number. A mileage sensor 3 that outputs mileage data by integration, a GPS receiver 4 that receives radio waves from GPS satellites and outputs GPS positioning data, and azimuth data, angular velocity data, mileage data, and GPS positioning data. Based on this, the system controller 5 that controls the entire navigation system, the input device 11 for inputting various data, and the CD-ROM that reads and outputs various data from the CD-ROM disk DK under the control of the system controller 5. (Compact Disk-Read Only Memory) Drive 2, a display unit 13 for displaying various display data under the control of the system controller 5, a sound reproducing unit 18 to reproduce various audio data under the control of the system controller 5 outputs, is configured to include a.

  The system controller 5 includes an interface unit 6 that performs an interface operation with the outside, a CPU 7 that controls the entire system controller 5, a ROM (Read Only Memory) 8 that stores a control program that controls the system controller, and a non-illustrated nonvolatile memory A random access memory (RAM) 9 that stores various data in a writable manner. The input device 11, the CD-ROM drive 12, the display unit 13, and the sound reproduction unit 18 are: They are connected via a bus line 10.

  The display unit 13 includes a graphic controller 14 that controls the entire display unit based on control data from the CPU 7 sent via the bus line 10, and a memory such as a VRAM (Video RAM). A buffer memory 15 that temporarily stores and a display control unit 16 that controls display of a display 17 such as a liquid crystal display device or a CRT (Cathode Ray Tube) based on image data output from the graphic controller 14. Has been.

  The sound reproduction unit 18 includes a D / A converter 19 that performs digital / analog conversion of audio digital data sent from the CD-ROM drive 12 or the RAM 9 via the bus line 10, and an acoustic analog output from the D / A converter 19. An amplifier 20 that amplifies the signal and a speaker 21 that converts the amplified acoustic analog signal into an acoustic vibration and outputs it are configured.

  In this case, the geomagnetic sensor 1, the angular velocity sensor 2, the mileage sensor 3, and the GPS receiver 4 constitute a positioning means. The system controller 5 corresponds to control means, and the input device 11 corresponds to input means. The CD-ROM disc DK and the CD-ROM drive 12 also serve as map information recording means and facility information recording means. The display unit 13 corresponds to image display means, and the sound reproduction unit 18 corresponds to sound output means.

  The RAM 9 stores route data of the moving body as shown in FIG. This route data may be manually set by the driver of the moving body or the operator of the navigation device, or may be automatically set.

  The route data is divided into blocks for each waypoint, and each block B1 to Bn stores “longitude / latitude data”, “right / left turn guide number data”, and the like of the waypoint.

  “Right / left turn guide number data” corresponds to the voice guide message shown in FIG. 3, and a progress guide message is assigned to each of the numbers “0, 1, 2,..., 9”.

  Each of the above-mentioned data is sequentially read and read as path data blocks B1 and B2 each time an approach state is detected by the target approach detection means of the navigation device.

  The target approach detection means is realized by the CPU 7 executing a detection program stored in the ROM 8 based on positioning data from the self-supporting sensors 1, 2, 3 and / or the GPS 4. In other words, if the position data of the target right / left turn point and the current position data of the moving object are obtained, and the difference data between them is compared with a set value data, the approaching state of the moving object to the right / left turning point is detected. can do. Specifically, this is realized by the processing of step 102 in FIG.

  Next, an operation for outputting a voice guidance message will be described. Referring to FIGS. 4 and 5, the number of waypoints from start point P1 to final destination point Pn is set (step 100). Then, first, the CPU 7 calculates the distance between the current position of the moving body and the target left / right turning point (step 101). Next, in step 102, it is determined whether or not the calculated distance Di is within the range distance Dref for detecting the vicinity of the waypoint. If the moving body is not within the detection range Dref, the determination in step 102 is “NO”, and RETURN → START is repeated until the mobile body enters the detection range Dref.

If the distance Di is within the detection distance Dref, the process proceeds to step 105. In step 105, the output time ts of the travel guidance message for the right / left turning point P3 is subtracted from the current time t, and it is determined whether or not the subtracted value has passed a predetermined time tref. If the determination result in step 105 is “NO”, a sufficient time has elapsed, and after setting the predetermined time t to ts in step 107, the route guidance voice output subroutine is started in step 108, A voice message regarding the right / left turn point P3 (number 4 in FIG. 3 “turns right soon”) is output. In step 109, the target left / right turning point is incremented to the next P4, and the process returns to RET U RN.

  Next, processing is performed for the target left / right turning point P4. When P3 and P4 are close to each other, P4 is processed in the same manner as described above with the moving body not passing P3. Will be output (No. 6 in FIG. 3 "Soon to turn left"). As mentioned earlier, this message confuses the driver.

  Therefore, it is detected in step 105 that the predetermined timing tref has not elapsed since the output timing of the voice message for the previous P3 (YES), and the voice number is incremented by one in step 106. That is, it switches to the voice message of number 7 “continue turn left”. Then, as shown in FIG. 5, after step 107, a voice message of number 7 is output in step 108.

  According to the expression “continued” of number 7, the message output when the mobile body has not yet passed the target left / right turning point P3 is not a voice message to the right / left turning point P3 to be reached now. The voice message for the next P4 is recognized, and the driver can be prevented from being confused.

  Hereinafter, similarly, the above-described processing is performed for each of the right and left turning points P5 to Pn, and the moving body can be correctly guided to the final target point Pn.

[II] Second Embodiment FIG. 6 shows a second embodiment of the present invention.
In this embodiment, instead of using the “elapsed time” as a reference as in the first embodiment, the determination as to whether or not the output timing of the voice message currently being output is appropriate is used as a reference. As an example, the following is disclosed.
That is, as shown in FIG. 6, step 105 compares the difference between the current location P (x, y) and the position Ps (x, y) at which the voice message was last output with a certain distance Dref, and so on. The types of voice messages to be output are switched by the processes of .about.109.

  In both the first and second embodiments, the set values tref and Dref are values obtained empirically.

It is a block diagram which shows the structural example of the navigation apparatus of this invention. It is explanatory drawing of route data. It is explanatory drawing which shows the example of a voice guidance message. It is a flowchart figure of the voice guidance operation | movement in the navigation apparatus of this invention. It is explanatory drawing which shows the output timing of the voice guidance message of the navigation apparatus of this invention. It is a flowchart figure of the voice guidance operation | movement in the other Example of this invention. It is explanatory drawing which shows the example of a guidance path | route. It is explanatory drawing which shows the output timing of the conventional voice guidance message.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Geomagnetic sensor 2 ... Angular velocity sensor 3 ... Travel distance sensor 4 ... GPS receiver 5 ... System controller 7 ... CPU
DESCRIPTION OF SYMBOLS 11 ... Input device 13 ... Display unit 16 ... Display control part 17 ... Display 18 ... Sound reproduction unit 21 ... Speaker

Claims (2)

In the course of moving body moves a moving path including a plurality of right or left turn point, a navigation device having a route guidance output means for output the progression guidance messages left or right turn point,
The route guidance output means includes:
After outputting the travel guidance message of the right / left turning point that the mobile body should pass next, determine whether to output the progress guidance message of another right / left turning point,
When it is determined to output a progress guidance message of the other right and left turning points, it is determined whether or not the mobile body is passing the right and left turning points that should be passed next,
When it is determined that the mobile body has not passed the right / left turning point to be passed next, a progress guidance message using a different expression from the progress guidance message of the right / left turning point to be passed next is output. A navigation device characterized by the above. The navigation device according to claim 1 ,
The route guidance output means, wherein the next pass to progress information message progress information message of the right turn point and using the different representations should, as different representations of portions not mean traveling direction from each other output The navigation apparatus characterized by doing.

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