JP2001041753A - On-vehicle navigation system and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the interior noise by the operating sound of a DC-ROM drive or cooling fan at the time of non-navigation display. SOLUTION: This system comprises a key input processing part 9 for detecting the nonuse of navigation display function and a power source control part 13 for stopping, when the nonuse of navigation display function is detected, the operations of a CD-ROM drive 5 that is the reading means of map matching data used in autonomous navigation means and a cooling fan 7. When the navigation display is not performed, only position measurement by GPS is performed without performing map matching data processing, whereby the noise accompanying the access to the DC-ROM drive 5 or the noise accompanying the operation of the cooling fan 7 can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-vehicle navigation device and a recording medium, and more particularly, to a vehicle navigation device in which a display monitor and a navigation unit are integrated.

[0002]

2. Description of the Related Art In a conventional on-vehicle navigation apparatus, a navigation unit (a CD for driving a CD-ROM storing map data and the like) for controlling a navigation operation is provided.
(Including a ROM drive) was very large, and it was difficult to mount it on a dashboard near the driver's seat or an audio space for mounting AV equipment. Therefore, it has been common practice to place the navigation unit under a luggage space such as a trunk room or under a seat separately from a display monitor that displays map data and the like, and to wire between the navigation unit and the display monitor.

FIG. 6 is a diagram showing an example of a system configuration of a conventional vehicle-mounted navigation device. In FIG. 6, reference numeral 51 denotes a display monitor for displaying map data and the like, which is mounted on a dashboard or audio space near the driver's seat. The display monitor 51 is provided with a key switch for operating the in-vehicle navigation device. Further, a remote controller having a key switch for operating the in-vehicle navigation device may be provided separately from the display monitor 51.

Reference numeral 52 denotes a navigation unit including a CD-ROM drive. As shown in FIG. 6, the navigation unit 52 is placed under a luggage space such as a trunk room or under a seat.
Although not shown, this navigation unit 5
2 and the display monitor 51 are connected by wiring, and the navigation unit 52 performs a navigation operation according to the operation of the key switch on the display monitor 51 or the remote controller.

However, recently, the size of the navigation unit has been reduced, and it has become possible to mount the navigation unit in an audio space or the like by integrating it with a display monitor. FIG.
FIG. 1 is a diagram showing an in-dash storage type vehicle-mounted navigation device which is arranged in a dashboard or an audio space and is configured so that a display monitor can be taken in and out, and FIG.
(B) shows a state where the display monitor is stored.

In FIG. 7A, reference numeral 61 denotes a display monitor, which includes a display section 62 for displaying map data and the like, and a key switch 63 for an operator to instruct various navigation operations. In FIG. 7B, reference numeral 64 denotes a storage portion of the display monitor 61, in which the display monitor 61 is folded and stored. 65 is CD-R
An OM drive into which a CD-ROM storing map data and the like necessary for executing navigation is inserted.

[0007] Such an in-dash storage type vehicle-mounted navigation device is mounted on a dashboard or audio space near a driver's seat, for example, as shown in FIG. FIG. 8 shows a state in which the display monitor 61 is open, as in FIG. In such an in-dash storage type vehicle-mounted navigation device, a CD-R
OM drive near driver's seat, required CD
-ROM replacement can be easily performed.

[0008]

However, in an in-vehicle navigation device in which a display monitor and a navigation unit are integrated, a location where the navigation unit is located is closer to the driver's position, and a sound or unit for accessing the CD-ROM is required. The sound of the cooling fan provided inside may be annoying. Also, in the case of a vehicle-mounted navigation device having an auto-change function in which a plurality of CD-ROMs are inserted into a CD-ROM drive and automatically switched to an appropriate CD-ROM according to the present location, the sound of the change is also annoying. May be.

In order to keep track of the current position as the vehicle travels, the navigation unit does not perform navigation display (for example, when the display monitor is stored, when the screen is turned off, or when a TV image is displayed, etc.). )
However, the map matching process is performed in accordance with the traveling of the car. Therefore, in order to access the CD-ROM storing the data for the processing, the CD-RO
The M drive and the cooling fan are always operating. Therefore, when listening to music or a radio broadcast or watching a television broadcast without performing navigation display, there is a problem that the access sound and the operation sound of the fan are very worrisome as noise.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and is intended to reduce in-vehicle noise due to the operation noise of a CD-ROM drive and a cooling fan when navigation display is not performed. The purpose is to do.

[0011]

An on-vehicle navigation device according to the present invention is a vehicular navigation device having means for detecting the current position of a vehicle using both GPS positioning means and autonomous navigation means. Non-use detection means for detecting non-use; and control means for stopping the operation of data reading means used in the autonomous navigation means when the non-use detection means detects non-use of the navigation display function. Prepare. The control means may stop the operation of the cooling fan when the nonuse of the navigation display function is detected by the nonuse detection means. Further, the non-use detecting means may be constituted by a storage detection switch for detecting storage of a display monitor for displaying map information during a navigation operation. Further, the non-use detecting means may be constituted by a display switch of a display monitor for displaying map information during a navigation operation.

According to the present invention constructed as described above, when the navigation display is not performed, the access to the data reading means (CD-ROM drive or the like) used in the autonomous navigation means is stopped to perform the map matching processing. By not performing such operations, it is possible to eliminate noise caused by access to the reading unit. Further, when the operation of the cooling fan is stopped when the navigation display function is not used, it is possible to eliminate the noise caused by the operation of the cooling fan.

In the present invention, the operation of the navigation unit is not simply stopped when the use of the navigation display function is detected, but the operation by the GPS positioning means (correction operation of the sensor used in the autonomous navigation means) is continued. Will be performed. Thus, when the navigation display is restarted, it can be started up in a short time.

That is, if the operation of the GPS positioning means is also stopped, it takes time to re-receive the satellite orbit when the operation is started next time. Also, the direction sensor used in the autonomous navigation means, for example, a vibration gyro is affected by drift due to temperature and the like, and unless the correction operation by the GPS positioning means is always performed, drift correction at the time of restart is not stable and difficult. . Also, in the geomagnetic sensor, it takes time for the azimuth error due to the magnetization to converge, and similarly, the operation at the time of restart becomes unstable. On the other hand, even when the navigation display function is not used, GP
In the present invention in which the operation of the S positioning means is continuously performed, such a disadvantage does not occur.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram illustrating the configuration of the vehicle-mounted navigation device according to the present embodiment. The in-vehicle navigation device of the present embodiment is a GPS (Global P
The present invention relates to a navigation device using both an ositioning system and autonomous navigation, wherein a navigation unit including a CD-ROM drive and a controller is integrated with a display monitor.

In FIG. 1, reference numeral 1 denotes a display monitor of an in-dash storage type, which displays map data visually representing roads, typical buildings, and the like on which a car travels when a navigation operation is performed, and a mark indicating a current position. And so on. This display monitor 1 is an LCD having a backlight.
A display unit (liquid crystal display unit) 2, a key input unit 3 having key switches for an operator to instruct various navigation operations, and a monitor opening / closing mechanism 4 for putting the display monitor 1 in and out of the unit are provided.

FIG. 2 is a diagram showing a configuration example of the display monitor 1. As shown in FIG. In FIG. 2, the same components as those shown in FIG. 1 are denoted by the same reference numerals. In the example shown in FIG. 2, various key switches included in the key input unit 3 include:
Screen OFF switch 3a, volume switch 3b, wide area / detail switch 3c, menu switch 3
d, present location switch 3e, return switch 3f, execution switch 3g, and direction switch 3h.

The screen OFF switch 3a is a switch for preventing the navigation display on the LCD display unit 2 from being performed.
Is not stored in the unit, but the navigation display is stopped. The volume switch 3b is a switch for adjusting the volume of the voice when performing road guidance or the like by voice.

A wide area / detail switch 3c
Is a switch for selecting whether to display a wide area or to display a relatively narrow range in detail when displaying map data on the LCD display unit 2. Menu switch 3d
When performing navigation actions, the destination setting,
A switch for selecting various functions such as a course change and traffic information confirmation. The current location switch 3e is a switch for confirming the current location where the car is located on the map data displayed on the LCD display unit 2.

The return switch 3f is a switch for returning to the original display state (display state of the current location) when the map data on the LCD display unit 2 is sequentially scrolled and displayed using the direction switch 3h. It is. The execution switch 3g is a switch for instructing execution of the function selected by the menu switch 3d. The direction switch 3h is a switch for sequentially scrolling and displaying the map data on the LCD display unit 2 as described above, and is used, for example, when confirming the route from the current position to the destination.

In FIG. 1, a CD-ROM drive 5 drives the inserted CD-ROM 6 in response to a request from the map data reading section 11 to read map data and map matching data. The map matching data is network data indicating how a plurality of roads are linked via an intersection, and is composed of vector data of the direction and distance of the road. A map matching process described later is performed using the map matching data.

Reference numeral 7 denotes a cooling fan, which is a CD-ROM.
This is for suppressing heat generation of the drive 5 and a microcomputer (CPU) provided in the control controller 8 to be described later. By sending air to the CD-ROM drive 5 and the control controller 8, the temperature of the circuit elements becomes higher than necessary. To avoid climbing.

FIG. 3 shows a configuration example of the monitor opening / closing mechanism 4, the CD-ROM drive 5, and the cooling fan 7 provided in the display monitor 1. In FIG. 3, the same components as those shown in FIG. 1 are denoted by the same reference numerals.

In the example shown in FIG. 3, the display monitor 1 is mounted on a support 33 via a rotating mechanism 32 so as to be rotatable in the direction of arrow A. The state indicated by the one-dot chain line of the display monitor 1 indicates the state where the display monitor 1 is open. Further, the state shown by the solid line is a state in which the display monitor 1 can be stored in the unit 34. In this state, the display monitor 1 and the support portion 33 slide integrally in the direction of arrow B. The display monitor 1 is moved in and out.

In the interior of the unit 34, the display monitor 1 is stored in the
A storage detection switch 31 is provided at a position where one end of the switch 3 contacts. The storage detection switch 31 is connected to the support 33
Detects that the display monitor 1 is housed in the unit 34, that is, does not perform navigation display, and outputs a detection signal. The CD-ROM drive 5 is configured to be slidable in the direction of arrow C.
The loading and unloading of the ROM 6 is performed.

The in-vehicle navigation device according to the present embodiment is applicable to a pop-up storage type as shown in FIG. 4 in addition to an in-dash storage type as shown in FIG. In the example of FIG. 4, the display monitor 1
Is mounted on the unit 43 so as to be rotatable in the direction of the arrow D via the. The state indicated by the solid line on the display monitor 1 is as follows.
This shows a state where the display monitor 1 is opened. The state shown by the dashed line in the display monitor 1 indicates the state where the display monitor 1 is stored on the unit 43.

The unit 43 includes the display monitor 1
Is stored in the unit 43 and the display monitor 1
The storage detection switch 41 is provided at a position where a part of the switch contacts. The storage detection switch 41 is connected to the display monitor 1.
, The display monitor 1 detects that the display monitor 1 is stored in the unit 43, that is, does not perform navigation display, and outputs a detection signal. As described above, the storage detection switches 31 and 41 and the screen OFF switch 3a in FIG. 2 constitute the non-use detection means of the present invention.

The controller 8 of FIG. 1 controls the execution of the navigation operation in accordance with the operation of the key input unit 3 on the display monitor 1 or the key switch on the remote controller (not shown). In the configuration inside the controller 8,
Reference numeral 9 denotes a key input processing unit, which operates the keys on the key input unit 3 and the storage detection switch 3 shown in FIGS.
A process for detecting ON / OFF of the switches 1 and 41 is performed.

Reference numeral 10 denotes a map display processing unit, which indicates the current location in the map data corresponding to the current position of the car when the key input unit 3 instructs the navigation display via the key input processing unit 9. A mark or the like is superimposed and displayed on the LCD display unit 2. The map data to be displayed here is data read from the CD-ROM 6 in the CD-ROM drive 5 using the map data reading unit 11, and is a map of a predetermined range including the current position 21 detected by a map matching process described later. Data.

The current location 21 is detected by GPS positioning or autonomous navigation. When the car travels, the current location 21 is sequentially detected in accordance with the travel, and the map data on the LCD display unit 2 is scrolled and displayed accordingly. At this time, the map data reading unit 11 pre-reads not only the map data that can be displayed on the LCD display unit 2 but also the map data of a predetermined area including its peripheral portion from the CD-ROM 6, so that the scroll display is smooth. To be done.

Reference numeral 12 denotes a display monitor opening / closing control processing unit.
When the opening / closing of the display monitor 1 is instructed from the key input unit 3 via the key input processing unit 9, the monitor opening / closing mechanism 4 is controlled to execute storage and removal of the display monitor 1. 1
Reference numeral 3 denotes a power supply control unit, which receives an instruction from the key input processing unit 9, the LCD display unit 2, and the CD-ROM drive 5.
And controls ON / OFF of the power supply of the cooling fan 7.
The power control unit 13 corresponds to a control unit of the present invention.

For example, when performing a navigation operation as usual, the power supply control unit 13 controls the LCD display unit 2 and C
The power supplies of the D-ROM drive 5 and the cooling fan 7 are all turned on. On the other hand, the screen OFF switch 3 shown in FIG.
When a is operated, and when the display monitor 1 is stored and the storage detection signals are output from the storage detection switches 31 and 41, the power of the LCD display unit 2, the CD-ROM drive 5, and the cooling fan 7 is turned off. , Stop these operations.

Reference numeral 14 denotes a GPS antenna which receives radio waves from artificial satellites. Reference numeral 15 denotes a GPS receiver.
The radio wave received by the PS antenna 14 is received.
A direction sensor 16 such as a vibration gyro outputs direction data according to the direction of the vehicle. Reference numeral 17 denotes a vehicle speed sensor, which outputs a number of pulses proportional to the rotation speed of the axle.

Reference numeral 18 denotes a positioning processing unit, which is a GPS receiver 1
The current position, heading, and speed of the vehicle are measured in absolute values based on the data received by the control unit 5. The positioning processing unit 18 also
In the case of a vibrating gyro, the traveling direction of the vehicle is detected by integrating the azimuth change amount data from the azimuth sensor 16, and the pulse of the vehicle is integrated by integrating pulses proportional to the rotation speed of the axle output from the vehicle speed sensor 17. Measure the mileage.

Reference numeral 19 denotes a sensor correction processing unit,
Based on the positioning data of the absolute value based on the reception data of the S receiver 15, the direction sensor 16 and the vehicle speed sensor 17 are used.
To correct the positioning data. That is, in the autonomous navigation using the azimuth sensor 16 and the vehicle speed sensor 17, since the positioning of the traveling direction and the traveling distance of the vehicle is performed by integrating the sensor outputs, errors are accumulated as the vehicle travels. Go. The current position of the vehicle detected by the autonomous navigation is corrected to a correct position by correcting it based on the positioning data of the absolute value by the GPS receiver 15.

Specifically, based on the data of the absolute position and the absolute speed of the vehicle measured based on the data received by the GPS receiver 15, the running distance when the vehicle travels in a straight line is detected. The travel distance per pulse output from 17 is corrected. Further, based on the absolute azimuth data measured based on the reception data of the GPS receiver 15, the drift offset voltage of the vibration gyro constituting the azimuth sensor 16 is corrected to zero point, and the integrated azimuth data is also reset.

Reference numeral 20 denotes a map matching processing unit which compares the traveling locus of the vehicle measured by the positioning processing unit 18 with the map matching data (road network data) read from the CD-ROM 6 by the map data reading unit 11. Then, the current position 21 of the car is determined by performing processing for matching the two. Sensor correction processing unit 1
9 may correct the azimuth sensor 16 and the vehicle speed sensor 17 by feeding back the link angle and the linear link distance of the road data as a result of the processing by the map matching processing unit 20.

As described above, the map data reading unit 11
Is to pre-read, from the CD-ROM 6, a predetermined range of map matching data including a peripheral portion thereof in addition to the map matching data of the range in which the map data is displayed on the LCD display unit 2, and buffer the data in a buffer memory (not shown). I have. Therefore, the map matching process is performed using the buffered map matching data as long as the map matching data can be used. However, if the buffered map matching data cannot be used as the vehicle travels, the CD-ROM drive 5 is accessed to read out the corresponding map matching data together with the map data, and the map matching process is continued. .

In the in-vehicle navigation device of the present embodiment, when performing the navigation operation as usual, the map matching process is executed as usual. on the other hand,
When the navigation display is not performed, that is, when the screen OFF switch 3a shown in FIG. 2 is operated, or when the display monitor 1 is stored and the storage detection switches 31 and 4 are stored.
When the storage detection signal is output from No. 1, the map matching process is not performed, and only the sensor correction process based on the data received by the GPS receiver 15 is performed. At this time, as described above, the power of the LCD display unit 2, the CD-ROM drive 5, and the cooling fan 7 is turned off, and the operations thereof are also stopped.

Next, the operation of detecting the current position by the on-vehicle navigation device of the present embodiment configured as described above will be described.
This will be described with reference to the flowchart of FIG. First, in step S1, the storage detection switch 3 shown in FIGS.
1, 41 or the screen OFF switch 3a shown in FIG. 2 is turned ON (output of the storage detection signal from the storage detection switches 31, 41, or screen OF from the screen OFF switch 3a).
The key input processing unit 9 determines whether or not the F signal has been output. If any of these switches is ON, the power control unit 13 determines in step S2 that the CD-ROM
The power of the drive 5 is turned off to stop its operation, and the power of the cooling fan 7 is turned off in step S3.
To stop the operation.

On the other hand, the storage detection switches 31, 41,
If none of the screen OFF switches 3a is ON, the process jumps to step S4 without performing the processing of steps S2 and S3. In step S4, a radio wave is received by the GPS receiver 15 via the GPS antenna 14, and the absolute position, traveling direction,
A process for measuring speed data is performed. In the next step S5, the positioning processing unit 18 captures and integrates the output data of the direction sensor (vibrating gyroscope) 16 and the vehicle speed sensor 17, and calculates the current estimated position.

Next, in step S6, map matching data (road network data) necessary for performing a map matching process on the calculated estimated position.
Is stored in a buffer memory (not shown). Here, if the map matching data of the corresponding area does not exist in the buffer memory, step S
7 and the storage detection switches 31, 41 or the screen OF
It is determined whether or not the F switch 3a is ON.
If these switches are ON, the process jumps to step S12 without performing the map matching process.

On the other hand, the storage detection switches 31, 41,
If none of the screen OFF switches 3a is ON, the power control unit 13 determines in step S8 that the CD-ROM
The power of the drive 5 is turned on to start the operation, and in step S9, the power of the cooling fan 7 is turned on to start the operation. Then, in step S10, the map data reading unit 11 reads new map matching data from the CD-ROM 6 into the buffer memory. The map matching processing unit 20 determines the current location 21 by performing the map matching processing in step S11 using the newly read data.

If it is determined in step S6 that the map matching data of the corresponding area exists in the buffer memory, the process jumps to step S11 to execute the map matching processing. That is, if the map matching data already buffered against the calculated estimated position can cope,
Instead of accessing the D-ROM drive 5 and reading new data from the CD-ROM 6, the map matching process is continuously performed using the buffered data.

Next, in step S12, based on the absolute value data (position coordinates, speed data) obtained by the GPS reception processing in step S4, the traveling distance when the vehicle travels in a straight line is detected, and the vehicle speed is determined. The travel distance per pulse output from the sensor 17 is corrected. Step S1
At 3, the drift offset voltage of the vibrating gyroscope constituting the direction sensor 16 is corrected to zero based on the absolute value data (traveling direction data) obtained by the GPS reception processing in step S4, and the gyro integration direction is also reset. . After the processing in step S13, the process returns to step S1 again, and the same processing is repeated.

As described above, in the present embodiment, when the navigation display is not performed, the access to the CD-ROM drive 5 is stopped so that the map matching process is not performed. Noise associated with access to the Internet can be eliminated. Further, C
By stopping the operation of the D-ROM drive 5, the amount of heat generated by the navigation unit is suppressed, so that the operation of the cooling fan 7 can also be stopped, and the noise in the vehicle can be reduced. Further, current consumption can be suppressed.

Further, when the navigation display is not performed, the operation of the navigation unit is not completely stopped, but the sensor correction operation based on the GPS reception data is continuously performed. It can be kept within the predetermined range, and the accurate current position can be detected in a short time when the navigation display function is activated again.

The control controller 8 of the on-vehicle navigation device according to the present embodiment described above comprises a computer CPU or MPU, RAM, ROM, etc., and operates the programs stored in the RAM or ROM. Can be realized by Therefore, the present invention can also be realized by recording a program that causes a computer to perform the above functions on a recording medium such as a CD-ROM, and reading the program into the computer. As a recording medium for recording the above program, a floppy disk, hard disk, magnetic tape, magneto-optical disk, nonvolatile memory card, or the like can be used other than the CD-ROM.

The functions of the above-described embodiments are realized when the computer executes the supplied program, and the OS (Operating System) or other application software running on the computer. When the functions of the above-described embodiment are realized in cooperation with the computer, or when all or a part of the processing of the supplied program is performed by a function expansion board or a function expansion unit of a computer, the functions of the above-described embodiment are realized. Such a program is also included in the embodiment of the present invention.

The above-described embodiment is merely an example of the embodiment for carrying out the present invention, and the technical scope of the present invention should not be interpreted in a limited manner. It is. That is, the present invention can be embodied in various forms without departing from the spirit or main features thereof.

For example, in the above embodiment, an example is described in which the present invention is applied to an in-vehicle navigation device that performs a map matching process. However, the present invention can also be applied to an in-vehicle navigation device that does not perform a map matching process. By stopping the access to the CD-ROM drive and the operation of the cooling fan when the display monitor is not used, the vehicle interior noise can be similarly reduced.

Also, it is troublesome to output the voice guidance and beep sound of the navigation when the navigation display is not used, so that these sounds are not output when the navigation display function is not used. By doing so, the vehicle interior noise may be similarly reduced. In the above embodiment, the CD-
Although the configuration including the ROM drive has been described, a DVD drive or the like may be used.

[0053]

According to the present invention, as described above, when the non-use of the navigation display function is detected, the operation of the data reading means used in the autonomous navigation means and the operation of the cooling fan are stopped. When the navigation display is not being performed, noise associated with access to the readout unit and noise associated with the operation of the cooling fan can be eliminated, and vehicle interior noise can be reduced. Moreover,
In the present invention, when the navigation display function is not used, the operation of the navigation unit is not simply stopped, but the operation by the GPS positioning means is continuously performed. It can be detected in time.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a vehicle-mounted navigation device according to an embodiment.

FIG. 2 is a diagram illustrating a configuration example of a display monitor.

FIG. 3 is a monitor opening / closing mechanism of a display monitor, CD-R.
FIG. 3 is a diagram illustrating a configuration example of an OM drive and a cooling fan.

FIG. 4 is a monitor opening / closing mechanism of a display monitor, CD-R.
FIG. 9 is a diagram illustrating another configuration example of the OM drive and the cooling fan.

FIG. 5 is a flowchart illustrating an operation of detecting a current position by the vehicle-mounted navigation device according to the embodiment;

FIG. 6 is a diagram illustrating a system configuration example of a conventional vehicle-mounted navigation device.

FIG. 7 is a diagram showing an in-dash storage type vehicle-mounted navigation device configured to be able to be taken in and out of a dashboard.

FIG. 8 is a diagram showing a state where an in-dash storage type vehicle-mounted navigation device is mounted near a driver's seat.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Display monitor 2 LCD display part 3 Key input part 3a Screen OFF switch 4 Monitor opening / closing mechanism 5 CD-ROM drive 6 CD-ROM 7 Cooling fan 8 Control controller 9 Key input processing part 10 Map display processing part 11 Map data reading part 12 Display monitor open / close control processing unit 13 Power control unit 14 GPS antenna 15 GPS receiver 16 Direction sensor (vibrating gyro) 17 Vehicle speed sensor 18 Positioning processing unit 19 Sensor correction processing unit 20 Map matching processing unit 31 Storage detection switch 41 Storage detection switch

Claims (6)

[Claims] 1. An in-vehicle navigation device having means for detecting a current position of a vehicle using both GPS positioning means and autonomous navigation means, wherein the non-use detection means detects non-use of a navigation display function. An on-vehicle navigation device, comprising: control means for stopping operation of a data reading means used in the autonomous navigation means when the non-use detecting means detects non-use of the navigation display function. 2. The in-vehicle navigation device according to claim 1, wherein the control means stops the operation of the cooling fan when the non-use of the navigation display function is detected. 3. The in-vehicle navigation according to claim 1, wherein said non-use detecting means comprises a storage detection switch for detecting storage of a display monitor for displaying map information during a navigation operation. apparatus. 4. The on-vehicle navigation device according to claim 1, wherein said non-use detecting means is constituted by a display switch of a display monitor for displaying map information during a navigation operation. 5. An in-vehicle navigation device having means for detecting a current position of a vehicle using both GPS positioning means and autonomous navigation means, wherein the non-use detection means for detecting non-use of a navigation display function, and A program for causing a computer to function as control means for stopping the operation of the data reading means used in the autonomous navigation means when the non-use of the navigation display function is detected by the detection means is recorded. Computer readable recording medium. 6. A program for causing a computer to further function as a means for stopping the operation of the cooling fan when the nonuse of the navigation display function is detected by the nonuse detection means. 6. The computer-readable recording medium according to claim 5, wherein: