JPH075084U - Vehicle navigation system - Google Patents

Abstract

(57) [Abstract] [Purpose] A navigation device can easily set the current time used for predicting the arrival time during route guidance. [Construction] A navigation device that calculates the azimuth and traveling distance of a vehicle in accordance with the detection results of the geomagnetic sensor 12 and the wheel speed sensor 13, and displays the vehicle position on a map screen to provide route guidance to a destination. 1 receives a signal from a positioning satellite and measures the position of the vehicle 1
5 is provided. When the GPS receiver 15 can receive a signal from a positioning satellite at the time of entering the setting mode, the current time used for predicting the arrival time at the time of the route guidance is the current time included in the signal. The time obtained from the data can be set. Thus
The current time can be easily set without complicated key operation according to the time signal.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle navigation device that is useful for determining a driver's route by displaying a recommended route between a current position and a destination on a map screen.

[0002]

[Prior art]

 By calculating the azimuth and distance traveled by the vehicle based on the detection results from the geomagnetic sensor and wheel speed sensor from the initially set position, and displaying the calculated current position on the map screen, Conventionally, navigation devices that are useful for making a route decision have been widely used. This navigation device also displays the recommended route from the current position to the destination by inputting the destination, and estimates and displays the estimated time of arrival at the destination based on the vehicle speed, etc. It also has the features that Therefore, an operation for adjusting the current time is required.

[0003]

[Problems to be solved by the device]

 In the conventional technique typical of the navigation device as described above, the current time adjustment is, for example, in the current time setting mode, displayed on the display screen of the display means instead of the map screen display in the current navigation device. It is realized by displaying the time in use, moving the cursor to the place to be corrected in that time, and operating the up / down key in accordance with the time signal of the radio broadcast. .

Therefore, such a conventional technique is complicated in operation.

An object of the present invention is to provide a vehicle navigation device that can set the current time with a simple operation.

[0006]

Means for Solving the Problems The present invention comprises a detection means for detecting the azimuth and distance of travel of a vehicle, and calculates from the position of a vehicle set by a setting means, corresponding to the detection results. In the vehicle navigation device for which the means updates and calculates an image in which the vehicle position is synthesized on the map screen and displays it on the display device, a positioning device that receives signals from positioning satellites and measures the vehicle position is provided. The calculating means corrects and displays the own vehicle position obtained from the detection result of the detecting means in correspondence with the measurement result of the positioning device, and the setting operation of the current time is performed from the setting means. In this case, the vehicle navigation device is characterized in that the current time is set in response to the current time data contained in the signal from the positioning satellite received by the positioning device, and is used for the arithmetic processing.

[0007]

[Action]

 According to the present invention, an arithmetic means having a detecting means for detecting a traveling direction and a distance of a vehicle realized by a geomagnetic sensor, a wheel speed sensor, etc., and including a microcomputer and a CD-ROM device, etc. Calculates the current vehicle position from the vehicle position initially set by the setting means in correspondence with the detection result of the detection means, and displays the image on the map screen in which the vehicle position is combined on the display means. The navigation system for vehicles will be equipped with a positioning device that can measure the vehicle position by receiving signals from positioning satellites.

The positioning device receives signals from at least four orbiting satellites in an orbit around the earth, finds the distance to each satellite from the arrival time difference, etc., and measures the distance of each vehicle from the distances by triangulation. It is a so-called Global Positioning System (hereinafter abbreviated as GPS) receiver that measures longitude and latitude. The calculation means corrects and displays the own vehicle position obtained from the detection result of the detection means by using the measurement result of the positioning device. This makes it possible to accurately guide the route to the destination.

The signal from the positioning satellite includes current time data highly accurately defined by an atomic clock. When the setting operation of the current time is performed by the setting means, the calculation means sets the current time in response to the current time data included in the signal from the positioning satellite.

Therefore, it is possible to easily set the current time without requiring a complicated operation in accordance with a time signal or the like. Using the current time thus set, for example, the arrival time at the time of the route guidance is predicted.

[0011]

【Example】

 FIG. 1 is a block diagram showing an electrical configuration of a navigation device 1 according to an embodiment of the present invention. The navigation device 1 is mounted on an automobile and is useful for determining a driver's course.

In the navigation device 1, in response to the operation of the operation keys 2, the central processing unit 3 realized by a micro computer or the like sends a desired area to the CD-ROM device 4 via the communication bus 10. Instruct to read the map information of. In response to the instruction, the processing circuit 5 reads the map information of the corresponding area from the map information recorded on the CD-ROM disk 7 via the decoder 6. Corresponding to the map information input from the decoder 6 via the communication bus 10, the central processing unit 3 drives a display device 9 realized by a liquid crystal display device or the like via a display drive circuit 8. By doing so, the map screen display of the desired area is realized.

When the vehicle position is input from the vehicle position setting key 2 a of the operation keys 2, the central processing unit 3 inputs the geomagnetic sensor 12 from the processing circuit 11 via the communication bus 10. According to the detection result of the wheel speed sensor 13, the azimuth and distance traveled by the vehicle are calculated, and the map information on the map screen corresponding to the current vehicle position is read from the CD-ROM device 4 described above. The map screen is scrolled and displayed along with the vehicle position. In addition, the vehicle's running locus is compared with the road shape obtained from the map information at predetermined intervals, and the vehicle position is set so that the running locus matches the road shape when turning right or left at an intersection, for example. Perform matching processing for correction. In this way, as indicated by reference numeral P1 in FIG. 2, the marker indicating the vehicle position and the traveling direction of the vehicle is updated and displayed as the vehicle travels.

In the present invention, a GPS receiver 15 is also connected to the central processing unit 3. The GPS receiver 15 receives the signals from at least four positioning satellites out of a plurality of positioning satellites that orbit the earth, obtains the distance between each satellite and the vehicle, and triangulates from that distance. Based on the above, the latitude and longitude of the vehicle are obtained and output to the central processing unit 3. Further, the signal from the positioning satellite includes current time data defined with high precision by an atomic clock.

When the destination is input and set from the destination setting key 2b and the cursor key 2d, the central processing unit 3 also indicates the current position of the vehicle indicated by the reference symbol P1 as shown in FIG. For example, the shortest route from the position and the traveling direction to the destination indicated by the reference symbol P2 is calculated and displayed as the recommended route. At this time, the estimated arrival time obtained from the distance to the destination and the traveling speed is displayed near the destination indicated by the reference numeral P2 as indicated by the reference numeral P3. In this way, route guidance to the destination with improved convenience can be provided.

The setting of the present time is started in response to the operation of the present time setting key 2c provided on the operation key 2, and the present time setting key 2c, the cursor key 2d, and the up / down key 2e are operated. In response to, as shown in FIGS. 3 and 4.

When the GPS receiver 15 can receive a signal from the positioning satellite when the current time setting key 2c is operated, the display shown in FIG. 3A is displayed. In FIG. 3 (1), the display area indicated by reference numeral α1 represents the time used for the arithmetic processing in the navigation device 1, and the display area indicated by reference numeral α2 is the GPS receiver. 15 represents the current time data demodulated from the signal received at 15. When the GPS clock key 2g is operated in the state shown in FIG. 3 (1), as shown in FIG. 3 (2), GPS reception is performed at the current time used for the arithmetic processing indicated by the reference numeral α1. The time obtained by the machine 15 is substituted and the current time is set. At this time, the current time is also displayed in the display area α3.

After that, when the map key 2i is operated, as shown in FIG. 3 (5), the screen is switched to the map screen display in which the current time is displayed in the display area α3.

When the operator intentionally wants to advance or delay the time with the current time data from GPS substituted for the current time to be set as shown in FIG. 3B, The cursor key 2d is operated. As a result, the cursor appears in the area indicated by the reference numeral α1 as indicated by the reference numeral α4 and becomes as shown in FIG. 3 (3). Thereafter, the cursor key 2d, the up / down key 2e, and the setting key 2f are operated to obtain the display shown in FIG. 3 (4).

On the other hand, when the current time setting key 2c is operated and the GPS receiver 15 cannot receive the signal from the positioning satellite when the vehicle is located in the underground parking lot or under the viaduct, As shown in FIG. 4 (1), only the time used for the arithmetic processing is displayed in the display area indicated by the reference numeral α1, and nothing is displayed in the display area indicated by the reference numeral α2. Not done.

In this state, when the operator desires to manually set the current time, the cursor key 2d is operated. As a result, a cursor appears as indicated by reference numeral α4 in FIG. 4 (2), and the cursor key 2d is operated to move the cursor to a desired position for correction, and then the up / down key 2e is operated. The display content of the corresponding part is changed. When the correction is completed, the setting key 2f is operated, and a screen showing that the setting of the current time is completed is displayed as shown in FIG. 4 (3).

FIG. 5 is a flow chart for explaining the current time setting operation as described above. In step n1, it is determined whether or not the current time setting key 2c is operated. If so, the process proceeds to step n2, where the flag F indicating the time setting mode is set to 1, and then the process proceeds to step n3. When the current time setting key 2c is not operated in step n1, the process proceeds to step n4, and it is determined whether or not the flag F is 1, and if so, that is, the time setting key 2c is After the operation, until the setting key 2f is operated and the flag F is reset to 0 as described later, the process proceeds to step n3.

In step n3, it is determined whether or not the GPS receiver 15 can receive the signal from the positioning satellite, and if so, the process proceeds to step n5, and as shown in FIG. The date and time of use and the date and time obtained from the current time data of GPS are displayed. In step n6, it is determined whether or not the GPS clock key 2g is operated, and if so, in step n7, it is obtained by the GPS at the date and time currently used as shown in FIG. 3 (2). The date and time are substituted, and in step n7a, the current time is set and the current time is displayed in the display area α3. Then, the process proceeds to step n9, otherwise, the process directly proceeds to step n9.

At step n9, it is judged whether or not the cursor key 2d is operated. If so, at step n10, the cursor is displayed as shown in FIG. 3 (3), and the corresponding key operation is performed. Then the cursor is moved. In step n11, it is determined whether or not the up / down key 2e has been operated. If so, in step n12, the display of the portion where the cursor is aligned is corrected in response to the key operation, and Returning to step n9, otherwise returning directly to step n9. In this way, when the correction by the cursor key 2d and the up / down key 2e is completed, the process moves to step n12.

When the GPS receiver 15 cannot receive the signal from the positioning satellite in step n3, the process proceeds to step n8, and only the date and time currently used is displayed as shown in FIG. 4 (1). After that, the process proceeds to step n9. Therefore, when the process moves from step n8 to n9 to n12, the display is as shown in FIG.

When the cursor key 2d is not operated in step n9, that is, when the time is not corrected, the process proceeds to step n13, and it is determined whether or not the setting key 2f is operated, and if so, the process proceeds to step n14. Then, the current time is set. When the key is not operated in step n13, or from step n14, the process moves to step n15, it is determined whether the map key 2i is operated, and if it is operated, the process moves to step n16 to display the map screen. Then, in step n17, the flag F is reset to 0 and the operation is ended. When it is not operated, the operation is ended.

On the other hand, when the flag F is reset to 0 in step n4, that is, when the current time setting mode is not set, the process proceeds to step n21, in which the remaining keys of the operation keys 2 other than the keys 2a to 2i are set. It is determined whether or not a key, such as a scroll key, has been operated, and if so, a corresponding display is performed in step n22, and then the operation ends, otherwise, in step n23, as shown in FIG. 2 above. The normal map screen is displayed and the operation ends.

As described above, in the navigation device 1 according to the present invention, the current time used for predicting the arrival time during route guidance can be set in response to the time data received by the GPS receiver 15 from the positioning satellite. Therefore, it is not necessary to perform complicated key operations according to the time signal, etc., and operability can be improved.

The current time data demodulated by the GPS receiver 15 may be a signal from the positioning satellite closest to the positioning satellites. While it is necessary to receive signals from at least four positioning satellites, it is sufficient to receive signals from at least one positioning satellite. In order to correct the signal propagation time depending on the distance from the positioning satellite to the vehicle, the distance between the own vehicle position and each positioning satellite is calculated after the vehicle position is measured, and the propagation speed of the signal is calculated. The calculated current time may be corrected based on the distance and the distance. As a result, it is possible to set the highly accurate current time.

[0030]

[Effect of device]

 As described above, according to the present invention, a navigation device for a vehicle, which detects an azimuth and a distance traveled by a vehicle and updates and displays an image in which a position of a vehicle is synthesized, is realized by a GPS receiver or the like. A positioning device is installed to correct the vehicle position according to the measurement results of this positioning device, and when setting the current time, the setting is performed in response to the current time data included in the signal from the positioning satellite. For example, it is possible to easily set the current time as a reference for calculating the estimated arrival time at the time of route guidance.

[Brief description of drawings]

FIG. 1 is a block diagram showing an electrical configuration of a navigation device 1 according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a map screen display of the navigation device 1 at a normal time.

FIG. 3 is a GPS receiver 1 in the current time setting mode.
FIG. 5 is a diagram showing an example of a screen display in a state where a signal from a positioning satellite can be received in 5;

FIG. 4 is a diagram showing a display example in a state where a signal from a positioning satellite cannot be received in the current time setting mode.

5 is a flow chart for explaining a current time setting operation shown in FIGS. 3 and 4. FIG.

[Explanation of symbols]

 1 navigation device 2 operation key 3 central processing unit 4 CD-ROM device 5, 11 processing circuit 9 display device 12 geomagnetic sensor 13 wheel speed sensor 15 GPS receiver

Front page continuation (72) Inventor, Kako Masuda, 1-2-2 Goshodori, Hyogo-ku, Kobe, Hyogo Prefecture Fujitsu Ten Limited (72) Inventor, Teruyo Iwashita 1-2, Goshodori, Hyogo-ku, Hyogo Prefecture No. 28 in Fujitsu Ten Limited

Claims (1)

[Scope of utility model registration request] 1. A detection means for detecting the azimuth and distance of travel of a vehicle, wherein the calculation means, based on the detection results of the own vehicle position set by the setting means, displays the own vehicle position on the map screen. In the vehicular navigation device that updates and calculates the combined image and displays it on the display means, a positioning device that receives a signal from a positioning satellite and measures the own vehicle position is provided, and the calculation means is a positioning device. According to the measurement result, the own vehicle position obtained from the detection result of the detection means is corrected and displayed, and when the setting operation of the current time is performed from the setting means, the positioning satellite received by the positioning device. A navigation device for a vehicle, wherein the current time is set in response to the current time data included in the signal from the vehicle, and is used for arithmetic processing.