JPH10213443A - Vehicle-mounted navigation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the mounting operation of a device by selectively mounting both units of a GPS antenna and a self-contained navigation sensor to the base of an attachment part and rearranging the position detection of the GPS or the self-contained navigation. SOLUTION: An electrical contact for grounding and for antenna signal is provided at the side of a GPS unit 11 and a contact for grounding, sensor signal, and power supply is provided at the side of a self-contained navigation unit 12. Also, the connector of the electrical contact for grounding and for antenna signal of the GPS unit 11 is provided at the side of the self-contained navigation unit 12, and the contact and the connector are electrically connected. As a result, by connecting the units 11 and 12 of the GPS and the navigation and a base 13, both units 11 and 12 of the GPS and navigation can be selectively attached and detached. Initially only the GPS unit may exist and later the navigation unit 12 may be mounted to the base 13 temporarily, thus mounting both units 11 and 12 of the GPS and navigation in one piece at a time when mounting to another vehicle and simplifying a mounting operation.

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 more particularly to an attachment structure for mounting a GPS antenna unit and a self-contained navigation sensor unit.

[0002]

2. Description of the Related Art A vehicle-mounted navigation device mounted on a factory is provided with a GPS antenna, a direction sensor and a distance sensor for detecting an estimated position from the beginning, and performs hybrid position detection.

[0003] In an add-in type car navigation system, position detection is usually performed only by GPS. Also,
By installing a self-contained navigation unit that incorporates an azimuth sensor function and a distance detection function that detects the mileage that are sold separately (or included when the device is purchased), hybrid position detection becomes possible. Since the self-contained navigation unit is sold separately, the price of the navigation device can be reduced and the number of users can be increased. Then, if necessary, the self-contained navigation unit can be purchased and the function can be improved.

[0004] However, in order to mount the self-contained navigation unit, wiring work for detecting a vehicle speed pulse signal in order to detect a traveling distance is necessary, and the work has been difficult.

In order to improve this workability, in recent years, a self-contained navigation unit has a built-in acceleration sensor, and instead of detecting a vehicle speed pulse, detects a vehicle acceleration and calculates the acceleration by integrating the acceleration to obtain a simplified type. (See Japanese Patent Application Laid-Open No. 7-253326).

[0006]

The problem to be solved is that in the simple hybrid system described above, although the wiring of the vehicle speed sensor is not required, when the navigation device is lent to a friend or switched to a new car, or in recent years, When the navigation device is detached and attached to another vehicle, for example, when the navigation device is mounted on a rental car for which the demand for navigation is increasing, the GPS antenna unit and the self-contained navigation unit must be separately attached each time.

[0007]

SUMMARY OF THE INVENTION The present invention relates to an on-vehicle navigation device using both GPS navigation and self-contained navigation, and an attachment unit comprising a GPS antenna unit, a self-contained navigation sensor unit, and a base for mounting each of these units. After providing the antenna signal and sensor signal output terminals on the base side, the antenna signal is given to the navigation device body from the corresponding output terminal on the base side by assembling the GPS antenna unit to the base, By attaching the self-contained navigation sensor unit, a sensor signal is supplied to the navigation device main body from the corresponding output terminal on the base side, and the GPS antenna unit and the self-contained navigation sensor unit can be selectively attached to and detached from the base. I am doing

[0008]

According to the present invention, the base of the attachment portion is GPS
After the antenna unit and the self-contained navigation sensor unit can be selectively installed, it can be replaced with GPS-only position detection or high-accuracy position detection using self-contained navigation, and after the self-contained navigation unit is installed once. The GPS antenna unit and the self-contained navigation sensor unit are integrated so that the device can be easily attached to another vehicle.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
As shown in FIG. 1, a GPS antenna unit 11 and a self-contained navigation sensor unit 12 and their respective units 1
It comprises an attachment unit 1 comprising a base 13 capable of selectively attaching and detaching 1, 1 and 12, and a navigation device body 2.

An amplifier 111 for amplifying a reception signal of the antenna ANT is provided, and a high-frequency signal output from the amplifier 111 is superimposed on a power line of the amplifier 111 via a capacitor and output. Therefore, the number of signal lines can be reduced.

The self-contained navigation sensor unit 12 includes:
A direction sensor 121 for detecting the traveling direction of the vehicle and an acceleration sensor 122 are provided side by side.
In 3, the output of each of the sensors 121 and 122 is converted into a digital signal, and then the digital signal is subjected to parallel-to-serial conversion into a time series, so that each sensor signal is transmitted by digital multiplexing. .

The navigation apparatus body 2 periodically measures the position of the vehicle based on a power source 21, a GPS receiver 22, and a GPS reception signal, and based on the measured position, determines the current position on a road map. G
When the position cannot be measured by the PS, based on the traveling direction of the own vehicle detected by the direction sensor 121 in the attachment unit 1 and the travel distance obtained from the acceleration detected by the acceleration sensor 122,
An ECU that determines the current position on the road map by accumulating the position on the XY coordinates by arithmetic processing, and performs necessary control such as overall control and route guidance from the current position to the destination. Control processing unit 23 comprising
A map information storage medium 24 in which road map information based on digital map data is stored in advance, a storage medium reproducing unit 25 for selectively reading out necessary road map information from the map information storage medium 24, A display unit 26 for projecting a predetermined road map on the screen based on the issued road map information and updatingly displaying the current position of the vehicle on the road map projected on the screen as the vehicle travels; And various input operations such as giving an input command to the control processing unit 23 to select and specify a map to be displayed on the display unit 26, change the setting of the display scale, and arbitrarily set a destination on a road map. An operation unit 27 capable of performing a voice guidance, a voice synthesizing unit 28 and a speaker 29 for outputting guidance for driving guidance and instructions of various operation procedures by voice. It is.

In the present invention, particularly, in the present invention, as shown in FIG. 2, in the attachment unit 1, the grounding electric contact T1 and the electric signal for the antenna signal are provided on the GPS antenna unit 11 side. A contact T3 is provided, and an electric contact T4 for grounding, an electric contact T5 for sensor signal, and an electric contact T6 for power supply are provided on the self-contained navigation sensor unit 12 side.

Further, on the side of the self-contained navigation sensor unit 12,
In the GPS antenna unit 11, a connector terminal C1 of the grounding electrical contact T1 and a connector terminal C3 of the antenna signaling electrical contact T3 are provided, and a connector is provided between the connector terminal C1 and the grounding electrical contact T4. The terminal C3 and the power contact T6 are electrically connected to each other.

On the base 13 side, a connector terminal C4 of an electric contact T4 for grounding, a connector terminal C5 of an electric contact T5 for sensor signal, and an electric contact T for power supply.
6 connector terminals C6.

An antenna signal and a sensor signal are sent to the navigation apparatus main body 2 by using a two-core shielded wire 14 with the shield jacket being grounded.

Thus, the antenna signal and the sensor signal can be transmitted using one shield wire 14, and the noise resistance is improved.

At the bottom of the base 13, four magnetic rubber plates 131 are provided so that the attachment portion 1 can be attached to the vehicle body by attracting it.

If the ground is taken through each case portion of the GPS antenna unit 11, the self-contained navigation sensor unit 12, and the base 13, the electric contacts T1, T4 for grounding and the connector terminals C1, C4 need to be particularly provided. Disappears.

FIG. 3 shows a specific connection between the electric contacts T4 to T6 of the self-contained navigation sensor unit 12 and the connector terminals C4 to C6 on the base 13 side.
Here, each of the pin-type electric contacts T4 to T6 is attached to a predetermined position of the board 15, and the self-contained navigation sensor unit 12 is mounted on the base 13 so that the electric contact T4 to the corresponding position on the base 13 side is obtained. Each pin is inserted into each of the provided jack type connector terminals C4 to C6.

Between each case of the GPS antenna unit 11, the self-contained navigation sensor unit 12, and the base 13,
O-ring-shaped packings 16 for sealing are provided, respectively (see FIG. 4).

The GPS antenna unit 11, the self-contained navigation sensor unit 12, and the base 1
By taking electrical connection means between the base 13 and the base 13
The GPS antenna unit 11 and the self-contained navigation sensor unit 12 can be selectively attached to and detached from the vehicle.

FIG. 5 shows an installation state when the self-contained navigation sensor unit 12 is removed and the GPS antenna unit 11 is directly mounted on the base 13.

Here, in particular, when the GPS antenna unit 11 is provided with an electric contact T1 for grounding and an electric contact T2 connected by a jumper wire 17 and the GPS antenna unit 11 is directly mounted on the base 13, A means for electrically detecting that the GPS antenna unit 11 is directly mounted on the base 13 is provided by connecting the electric contact T2 by the jumper wire 17 to the connector terminal C5 for sensor signal output and setting the ground potential. I am taking it.

More specifically, the control processing section 23 of the navigation device main body 2 is provided with a connector terminal C for outputting a sensor signal.
5 level state, and when it is at a predetermined voltage (ground potential in this embodiment) for a certain time or more,
It is determined that the PS antenna unit 11 is directly mounted.

FIG. 6 shows an example of a processing flow when the position of the own vehicle in the control processing section 23 is obtained.

Here, first, G from three or more satellites is used.
It is determined whether a PS signal can be received (step S
1) When GPS signals from three or more satellites can be received, normal position measurement is performed by GPS (step S).
2) The current position on the road map is calculated from the measured position, and information on the current position is cumulatively stored in the internal memory (step S3).

If GPS signals from three or more satellites cannot be received, it is determined that the position cannot be measured by GPS (step S4).
By detecting whether the GPS antenna unit 11 is directly mounted on the base 13 of the vehicle or whether the self-contained navigation sensor unit 12 is incorporated, the device is set to the one based on the GPS navigation only, or It is determined whether or not it is set to a hybrid type with the navigation (step S5).

At this time, if the hybrid navigation system of the GPS navigation and the self-contained navigation is set, the change of the traveling distance and the traveling direction of the self-vehicle from the sensor signals relating to the direction and acceleration from the self-contained navigation sensor unit 12. Then, the current position on the road map is calculated by the self-contained navigation (step S6), and the information on the current position is cumulatively stored in the internal memory (step S3).

At this time, if the self-contained navigation sensor unit 12 is not mounted, a message indicating that the current position of the vehicle cannot be obtained is displayed (step S7).

FIGS. 7 and 8 show another embodiment of the attachment unit 1. FIG.

In this case, the connector terminals C1 to C3 for the CPS antenna unit 11 and the connector terminals C4 to C6 for the self-contained navigation sensor unit 12 are arranged on the base 13 side.

When the GPS antenna unit 11 is directly mounted on the base 13 as shown in FIG.
Each electric contact (T1 to T3) provided on the GPS antenna unit 11 side is connected to the corresponding connector terminal C1 to C3, and only the antenna signal AS is sent to the navigation device main body side. In this case, the connector terminals C4 to C6 for the self-contained navigation sensor unit 12 are in the open state OPEN. In the figure, reference numeral 18 denotes a screw for attaching the GPS antenna unit 11 to the base 13.

Also, as shown in FIG.
When mounting the PS antenna unit 11 and the self-contained navigation sensor unit 12, the self-contained navigation sensor unit 1
2 for bypass connector terminals C1'-C
3 'are corresponding connector terminals C1 to C on the base 13 side.
3 is connected. In the figure, 19 is the base 1
3 shows a screw for attaching the GPS antenna unit 11 and the self-contained navigation sensor unit 12.

The electrical contacts (T1 to T3) provided on the GPS antenna unit 11 side are connected to the corresponding connector terminals C1 to C3 via the bypass connector terminals C1 'to C3', and the antenna signal AS is output. Is sent to the navigation device body side.

At the same time, the self-contained navigation sensor unit 1
Each electrical contact (T4 to T6) provided on the second side is connected to the corresponding connector terminal C4 to C6, and the sensor signal SS
Is sent to the navigation device body side.

Here, the base 13 itself is made of magnetic rubber, so that the attachment 1 can be attracted to the vehicle body.

Since the attachment direction of the attachment unit 1 to which the self-contained navigation sensor unit 12 is attached is important because the detection directions of the direction sensor 121 and the acceleration sensor 122 are important, a mark for checking the attachment direction is attached when the attachment unit 1 is attached to the vehicle. Have been.

[0039]

As described above, according to the in-vehicle navigation device according to the present invention, even if the device is initially purchased only by GPS, after purchasing the self-contained navigation sensor unit and attaching it once to the base, When attaching the navigation device to another vehicle by lending it to a friend or switching to a new car, the self-contained navigation sensor unit and GPS antenna unit are integrated, so the installation only needs to be done once and the GPS antenna unit and self-contained navigation It is not necessary to separately remount the sensor units, and the workability of mounting is simplified.

[Brief description of the drawings]

FIG. 1 is a simplified configuration diagram showing one embodiment of a vehicle-mounted navigation device according to the present invention.

FIG. 2 is a simplified configuration diagram when a GPS antenna unit and a self-contained navigation sensor unit are mounted on a base of an attachment unit in the embodiment.

FIG. 3 is a diagram showing a connection state between each electric contact and each connector terminal on the base side in the self-contained navigation sensor unit.

FIG. 4 is a diagram showing a state in which packing is mounted between cases of a GPS antenna unit and a self-contained navigation sensor unit.

FIG. 5 is a simplified configuration diagram when only a GPS antenna unit is mounted on a base of the attachment unit in the embodiment.

FIG. 6 is a diagram illustrating a flow of a process when a position of the own vehicle is obtained in a control processing unit.

FIG. 7 is a simplified configuration diagram of an attachment unit when a GPS antenna unit is directly mounted on a base according to another embodiment of the present invention.

FIG. 8 is a simplified configuration diagram of an attachment unit when a GPS antenna unit and a self-contained navigation sensor unit are mounted on a base according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Attachment part 2 Navigation apparatus main body 11 GPS antenna unit 12 Self-contained navigation sensor unit 13 Base 121 Direction sensor 122 Acceleration sensor 123 Sensor signal processing part T3 Electric contact for antenna signal T5 Electric contact for sensor signal T6 Electricity for power supply Contact C1 to C6 Connector terminal C1 'to C3' Bypass connector terminal

Claims (2)

[Claims] 1. An on-vehicle navigation device using both GPS navigation and self-contained navigation, comprising: a GPS antenna unit, a self-contained navigation sensor unit, and an attachment unit including a base for mounting each unit. The antenna signal is provided to the navigation device main body from the corresponding output terminal on the base side by providing each output terminal of the antenna signal and the sensor signal on the side, and assembling the GPS antenna unit on the base,
An in-vehicle navigation device wherein a self-contained navigation sensor unit is mounted on a base so that a sensor signal is supplied to a navigation device main body from a corresponding output terminal on the base side. 2. The apparatus according to claim 1, further comprising means for identifying whether the GPS antenna unit is connected to the base or the GPS antenna unit and the self-contained navigation sensor unit are connected to the base. In-vehicle navigation device according to the description.