JPS62152000A - Onboard navigator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [[Field of Application Above 1] This invention is particularly applicable to an in-vehicle device used in an automobile, etc., which is effectively used when a failure occurs in the means for detecting the current position. Regarding navigation devices.

[Background Art] As a navigation device mounted on a vehicle such as an automobile, one that displays a map corresponding to the current location where the vehicle is traveling has been considered. In order to configure this navigation device, means for calculating the current traveling position of the vehicle is required in order to specify the area of the displayed map. As a means of calculating this current traveling position, there is an inertial navigation system 0 is Loran C
External devices such as 1 are used as appropriate, and the map area to be displayed is specified based on the current position calculated by these external devices. , installed in the vehicle and set independently from other equipment.
For this reason, information from other devices installed in the vehicle is completely unusable. For example, if a failure occurs in the communication equipment or sensors used to calculate the current location, This navigation device cannot perform abnormal map display control.

[Problems to be Solved by the Invention] This invention has been made in view of the above-mentioned points. Even if it becomes
In-vehicle use that effectively utilizes information from other equipment on board the vehicle to effectively calculate the current location of this vehicle and display a map of the area. The present invention relates to a navigation device.

Means for Solving Problems] That is, in the navigation device according to the present invention, control computers of various electronic control systems installed in a vehicle are connected to a common data bus to form a network. The control system is configured such that a car telephone system is set together with a navigation system. For example, if a failure occurs in the means for detecting the current location of a vehicle, the base station for the call is determined from the control signal output from the telephone system, such as the call channel of the above-mentioned car phone, and the base station for the call is determined. Determine the zone in which the vehicle is traveling. The determined zone information is then transmitted to the navigation system through the network, and a map corresponding to the zone can be displayed on a display device.

[Operation] In the navigation device configured as described above,
For example, in a car-mounted cell phone control device, in order to make effective use of frequencies, terminal stations are classified into small zones, and a control channel is always set between the base station and the JP station. Tracks which zone the vehicle is currently in. The service zone for each lap is fixed. Therefore, a car telephone device detects a code number corresponding to the zone in which the vehicle is currently driving during communication, and a navigation system detects the code number through the network and uses this code number. A map of the area corresponding to the code number will be displayed. That is, even if the means for detecting the current position is out of order, the navigation device will display a map corresponding to the vehicle's traveling position.

[Embodiments of the invention] An embodiment of the present invention will now be described with reference to the drawings.

Figure 1 shows its configuration. A data bus network 1 is formed inside the vehicle.
Although details are not shown in the diagram, control combinations that constitute electronic control systems such as an engine control system, a brake control system, a transmission control system, and an air conditioner control system are connected to this network 11. It is something.

Then, network 1 set up in the vehicle in this way
1 is further connected to a car telephone control circuit 12 and a navigation circuit 13, and this navigation date circuit 13 is supplied with detection signals from a vehicle speed sensor 14 and a geomagnetism detection circuit 15. . and,
The map data obtained by the navigation date circuit 13 is displayed on a display device 16.

The telephone control circuit 12 is connected to a transmitter/receiver 17 of a car telephone, and the transmitter/receiver 17 is configured to communicate with a base station 18 in the area in which the vehicle is traveling. In this case, the automobile telephone system and the navigation system are each configured and operated independently, and are only connected to each other by the network 11.

= 6- FIG. 2 shows the car phone control circuit 12, the navigation circuit 13, and the car phone transceiver 17.
1, a transmitting section 172 and a receiving section 173 are set, and the transmitting section 172 is configured to receive a signal from a synthesizer section 175 commanded by a control section 174 or as a transmission signal. Also, receive #I73
is also controlled by the control section 174.

A signal from a microphone connected to the car telephone control circuit 12 is supplied to the synthesizer section 175 via the switch circuit 121, and a signal from the receiving section 17g is also supplied via the switch circuit 122 of the control circuit 12. It is designed to be guided by a speaker.

"Switch circuit 12" and 122 are control circuit 1
The microcomputer 123 is controlled by the microcomputer 23 set to 2.
is connected to the control unit +74 of the transceiver I7 via a data line. Then, zone data corresponding to the zone of the base station detected by the control unit 174 is supplied to the microcomputer 123, and, for example, code number data corresponding to the regional zone in which the vehicle is traveling is supplied to the microcomputer 123. is connected to the network 11 from the microcomputer 123 via the serial interface 124.
It is now sent upwards. A keyboard 125 and a display section 126 are further connected to the microcomputer 123.

The navigation circuit 13 is equipped with a serial interface 181 connected to the network 11, and the microcomputer 132 can exchange data with the network 11 via this serial interface 131. This microcomputer 132 includes an RO that stores program data via a data bus.
M13B, RAM 134 that stores calculation data, etc.
is set, and a storage device 135 for storing map data etc. divided by region is connected. Further, detection signals from the vehicle speed sensor 14, the geomagnetism detection circuit 15, and a signal from an input switch 181 set on the display device 16 are supplied to the microcomputer 132 via an input interface 136.

The microcomputer +32 uses the data detected from the geomagnetism detection circuit 15, and also the vehicle speed sensor 14.
The current position of the vehicle is calculated based on the detection signal from the
Based on the calculated position data, map data is read from the storage device 135 and stored in the video RAM 137, and a control command is given to the CRT controller/roller 3B. The CRT display J[i2 of the display device is controlled by the CRT control circuit 189 to display the map data.

For example, if the geomagnetism detection circuit 15 or the like fails and the current position of the vehicle cannot be output, the serial interface 131 is sent from the network 11.
Based on the code number input from the car telephone control circuit 12 corresponding to the regional zone in which the vehicle is traveling, the location of the vehicle is determined, and the map data to be displayed is read out and displayed. It is something to do.

FIG. 3 shows the flow of the operation of the navigation device as described above. First, in step 301, it is determined whether or not the car telephone is communicating with the base station 18 of the regional zone where the vehicle is located. If it is determined that the call is in progress, the process proceeds to step 302, where the code number of the base station in use is set. If the call is not in progress, the base station code number is cleared in step 303.

"Step 30 from Steps 302 and 303 of 1.
4. The process further proceeds to step 805, in which it is determined whether or not the Jlli speed sensor 14 and the geomagnetism detection circuit 15 are malfunctioning, respectively. circuit 15
If it is determined that both of these are in a normal state, the process advances to step 306, and the vehicle running speed! lf! At each time, the direction of the vehicle signal is determined from the geomagnetic detection data, the current outside image area is calculated, and the process proceeds to step 307.

Further, if it is determined that at least one of the sensor 14 and the detection circuit 15 is malfunctioning, the process proceeds to step -]-308.

In both steps 307 and 308, it is determined whether or not the base station number has been cleared. If the base station number has not been cleared in step 307, the process proceeds to step 309, where the current location or base station area is determined. Determine whether it exists within.

If the base station number is cleared in step 307, and if it is determined in step 309 that a vehicle exists within the base station area, the process proceeds to step 310, where the map of the area calculated in step 306 is displayed. will be displayed, and the current location will also be displayed on this map.

If it is determined in step 308 that the base station number has not been cleared, and furthermore, if it is determined in step 309 that the current location is not within the base station area, proceed to step 31] and proceed to step 31. A map of the base station communication area of the zone corresponding to the station code number is displayed.

If it is determined in step 30B that the base station code number is cleared, it is not possible to determine the area of the map to be displayed, so step 30B is performed.
The process proceeds to step 12, where a failure is displayed.

[Effects of the Invention] As described above, the navigation device according to the present invention has the advantage that even when the position of a traveling vehicle cannot be determined due to a failure of the position detection mechanism, etc. This navigation device is connected to a network set up in the vehicle, and a car phone device is also connected to this network, so the function of this phone device can be used to detect the presence of the vehicle. You will be able to identify the regional zone in which you are located.

That is, the regional zone is specified by determining the base station with which the car telephone is making a call, and map data corresponding to which specified regional zone can be displayed. Therefore, the minimum required navigation data will be covered;
This is highly effective in improving the reliability of such navigation devices.

[Brief explanation of drawings]

FIG. 1 is a block diagram illustrating an in-vehicle navigation device according to the present invention, FIG. 2 is a block diagram showing in detail the automatic telephone control unit and navigation circuit of the device, and FIG. 1 is a flowchart illustrating the operation flow of the navigation device; 11... Network (data bus), 12... Car telephone control circuit, 13... Navigation circuit, 1
4...Vehicle speed sensor, 15...Geomagnetism detection circuit, 16.
・・Display manufacturing, 17・Car phone transceiver, 18・
··base station. Applicant's agent Patent attorney Rin 7], Takemu Figure 21

Claims (1)

[Claims] An in-vehicle network to which a control computer mounted on the vehicle is connected, an in-vehicle telephone control means connected to this network, and a control signal output from the telephone control means as described above. Current position detection means receives the control signal via the network and detects a telephone base station zone corresponding to the current vehicle position based on the control signal; and a map corresponding to the base station zone corresponding to the vehicle position detected by the means. An in-vehicle navigation device comprising: a display device that displays;