JP3702197B2 - Portable navigation device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a portable navigation device capable of displaying VICS information.
[0002]
[Prior art]
From April 23, 1996, a VICS (Vehicle Information and Communication System) service for transmitting traffic jam information to a navigation device mounted on a vehicle has started. This service is provided by the road traffic information communication system, and is transmitted by three communication means of FM multiplex broadcasting, radio wave beacon and optical beacon.
[0003]
[Problems to be solved by the invention]
However, if a portable navigation device whose production volume has been increasing in recent years is provided with a VICS function, the VICS screen is displayed when the navigation device is not installed in a vehicle, for example, when the navigation device is used in a room. There is a problem that must be prohibited. For this reason, it has been necessary to detect the state mounted on the vehicle by some method.
[0004]
[Means for Solving the Problems]
The portable navigation device of the present invention has been made in view of such a point. A power input unit that is supplied from a vehicle at a first voltage or is supplied from a vehicle other than a vehicle at a second voltage different from the first voltage;
A voltage detection unit for detecting a voltage supplied to the power input unit;
Control means for permitting VICS display when the voltage detected by the voltage detector is the first voltage, and prohibiting VICS display when the voltage is not the first voltage.
[0005]
A first adapter that transforms a DC voltage supplied from the vehicle to a first DC voltage; and a second adapter that transforms an AC voltage supplied from a commercial power supply to a second DC voltage different from the first DC voltage. Two adapters, and a power input terminal to which a first DC voltage transformed by the first adapter or a second DC voltage transformed by the second adapter is applied,
A voltage detector for detecting a voltage applied to the power input terminal;
Control means for permitting VICS display when the voltage detected by the voltage detection unit is the first DC voltage and prohibiting VICS display when the voltage is not the first DC voltage.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. The navigation device of the present embodiment displays VICS information.
[0007]
VICS is a service for transmitting traffic information to a navigation device, and is permitted for a navigation device mounted on a vehicle. This service provides information on three levels: Level 1 (character display, see Fig. 2), Level 2 (simple graphic display, see Fig. 3), and Level 3 (map display, see Fig. 4) Is done. At level 1, character data to be displayed is transmitted. In level 2, simple graphic data to be displayed is transmitted. At level 3, the map data itself is not transmitted, and the map database provided in the navigation device is used. The main roads are classified and numbered in advance, and the traffic congestion status is transmitted for each segment. It is left to the navigation device how to display this traffic jam information on the map.
[0008]
In level 1 and level 2, road traffic information cannot be displayed unless the user selects a desired program by specifying a content type such as traffic jam or regulation, a road type such as a highway or a national road, or a region. On the other hand, at level 3, VICS information relating to the road map being displayed is automatically retrieved.
[0009]
This service information is performed by three communication means of FM multiplex broadcasting, radio wave beacon and optical beacon. Either communication means provides the above three levels of information. FM multiplex broadcasting is broadcasted from NHK (Japan Broadcasting Corporation) facilities borrowed by the VICS Center, radio beacons are installed on highways led by the Ministry of Construction, and optical beacons are led by the National Police Agency and other than highways Installed on the road. An FM receiver is required to display VICS information in FM multiplex broadcasting, a radio beacon receiver is required to display VICS information in radio beacons, and an optical beacon to display VICS information in optical beacons. A receiver is required. This embodiment displays VICS information by FM multiplex broadcasting and has an FM receiver.
[0010]
FIG. 1 is a block diagram showing a configuration of a main part of the embodiment. This device includes an FM receiver (FM tuner) (1), a current position indicator (2), a rechargeable dry battery (3), a cigarette lighter adapter (4), or a commercial power adapter (5). It consists of
[0011]
In the FM receiver (1), the FM front end (11) amplifies the signal received from the antenna (12) to form a high frequency signal, and mixes this high frequency signal with the oscillation signal from the PLL circuit (13). Output an intermediate frequency signal. The FM-IF detector (14) performs FM detection on the intermediate frequency signal output from the FM front end (11).
[0012]
The multiplexed signal detection circuit (15) includes a multiplexing filter (not shown) and a data demodulation circuit (not shown). The multiplexing filter removes an audio signal and a noise component from the output signal of the FM-IF detector (14), and extracts an LMSK (Level controlled Minimum Shift Keying) signal multiplexed at 76 kHz. LMSK is a modulation method for controlling the size of a multiplexed signal in accordance with the size of a stereo audio signal. The data demodulation circuit demodulates the LMSK signal into a displayable data signal and sends it to the control circuit (16) of the FM receiver (1). The control circuit (16) of the FM receiver (1) instructs the frequency to be set in the PLL circuit (13).
[0013]
In the current position indicator (2), the control circuit (21) controls each part based on the program written in the ROM (22). The RAM (23) stores information necessary for the operation of the control circuit (21), for example, the update time of the displayed VICS information and the frequency of the FM multiplex broadcast station. A GPS (Global Positioning System) positioning means (24) receives a radio wave from a GPS satellite, measures the current position, and outputs measurement data to the control circuit (21) of the current position indicator (2). (25) is a map reproducing means, which reads the map information from the DVD in which the map information is written and outputs it to the control circuit (21). The display unit (26) is a liquid crystal, and displays a map, a current position, and VICS information based on the control of the control circuit (21). The input unit (27) performs various inputs related to the current position display and VICS. A brake terminal (28) is inserted with a side brake jack, and the insertion of the jack and the ON / OFF of the side brake (OFF indicates running) are detected and output to the control circuit (16). This ON / OFF is determined to be ON if the side brake jack line is not grounded, and is determined to be OFF if grounded.
[0014]
A method of supplying power from a cigarette lighter terminal (DC12V) of a vehicle, a method of supplying from a commercial power source (AC100V) such as a household outlet, and a method of supplying from a nickel mercury rechargeable dry cell (DC7.2V). There are types and the user can choose.
[0015]
When supplying from the cigarette lighter terminal, the cigarette lighter adapter (4) connected to the cigarette lighter terminal of the vehicle is connected to the external power input terminal (29) of the current position indicator (2). At this time, the cigarette lighter adapter (4) transforms the DC12V of the cigarette lighter terminal to DC9V. When supplying from commercial power, the commercial power adapter (5) connected to the commercial power is connected to the external power input terminal (29) of the current position indicator (2). At this time, the commercial power adapter (5) transforms the commercial power AC100V to DC 10.2V. When supplying from the rechargeable dry battery (3), the rechargeable dry battery (3) of DC 7.2V is connected to the battery terminal (30) of the current position indicator (2).
[0016]
The transformer circuit (31) transforms DC9V or DC10.5V from the external power supply input terminal (29) and DC7.2V from the battery terminal (30) to a predetermined voltage, and the current position indicator (2) and FM Power is supplied to each circuit of the receiver (1). The transformer circuit (31) detects the voltage applied to the external power input terminal (29) and outputs it to the control circuit (21). Further, when the DC 9V or DC 10.5V power is supplied from the external power input terminal (29) with the rechargeable dry battery (3) connected to the battery terminal (30), the transformer circuit (31) To charge the rechargeable battery (3).
[0017]
The operation of this embodiment will be described. FIG. 5 is a flowchart showing the operation of the control circuit (21) of the current position indicator (2).
[0018]
The control circuit (21) checks whether or not the power supplied to the navigation device is that of the vehicle by checking whether the voltage of the transformer circuit (31) is 9V (S1). If there is no power from the vehicle (N in S1), the display of VICS is prohibited (S2). Thereby, when the navigation apparatus is used with a home AC100 power supply or when it is used while walking with a battery, the display of VICS can be prohibited.
[0019]
When the vehicle power is supplied in step S1, the control circuit (21) checks whether or not the side brake can be detected ON / OFF by detecting the jack insertion of the brake terminal (28) (S3). ). Even when the side brake ON / OFF cannot be detected (N in S3), the process proceeds to step S2 to prohibit the VICS display.
[0020]
If the side brake ON / OFF can be detected in step S3, all levels can be displayed when the side brake is ON (Y in S4) (S5) and when the side brake is OFF (S5). N in S4), the level is automatically fixed to 3 and displayed (S6). This ON / OFF is determined to be ON if the side brake jack is not grounded, and is determined to be OFF if it is grounded.
[0021]
Thus, for safety, display of levels 1 and 2 which are troublesome to operate is prohibited during traveling.
[0022]
It should be noted that VICS display is forbidden by N in Step 1 and N in Step S3, and Step S3 may be omitted.
[0023]
Moreover, although the above-mentioned embodiment was VICS reception by FM multiplex broadcasting, it can be adapted to VICS reception by beacon.
[0024]
【The invention's effect】
The voltage to the external power input terminal of the conventional portable navigation device that can be used in the vehicle or at home is the same voltage (for example, DC 12 V) from the cigarette lighter system and the commercial power system. In the present invention, it is determined whether or not the power source is from a cigarette lighter system by making this voltage different. As a result, it is possible to detect a state in which the vehicle is not mounted on the vehicle, and prohibit display of VICS at this time.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a main configuration of the present invention.
FIG. 2 is a diagram showing a VICS level 1 screen.
FIG. 3 shows a VICS level 2 screen.
FIG. 4 is a diagram showing a VICS level 3 screen.
FIG. 5 is a flowchart showing main operations of the present invention.
[Explanation of symbols]
1 FM receiver 13 PLL circuit 15 Multiplex signal detection circuit 16 Control circuit (FM receiver)
2 Current position detector 21 Control circuit (current position detector)
23 RAM
24 GPS positioning means 25 Map reproduction means 26 Display part 27 Input part 28 Brake terminal 29 External power supply input terminal 30 Battery terminal 31 Transformer circuit 3 Rechargeable dry battery 4 Cigarette lighter adapter 5 Commercial power supply adapter

Claims (2)

In a portable navigation device having receiving means for receiving VICS information, a display section, and control means for controlling display on the display section of VICS information received from the receiving means.
A power supply input unit supplied from a vehicle at a first voltage or supplied from other than the vehicle at a second voltage different from the first voltage;
A voltage detection unit for detecting a voltage supplied to the power input unit ,
The control means allows VICS display when the voltage detected by the voltage detector is the first voltage, and prohibits VICS display when the voltage is not the first voltage. apparatus. In a portable navigation device having receiving means for receiving VICS information, a display section, and control means for controlling display on the display section of VICS information received from the receiving means.
A first adapter that transforms a DC voltage supplied from a vehicle into a first DC voltage, and a second adapter that transforms an AC voltage supplied from a commercial power source into a second DC voltage different from the first DC voltage. An adapter, and a power input terminal to which a first DC voltage transformed by the first adapter or a second DC voltage transformed by the second adapter is applied,
A voltage detection unit for detecting a voltage applied to the power input terminal,
The control unit allows VICS display when the voltage detected by the voltage detection unit is the first DC voltage, and prohibits VICS display when the voltage is not the first DC voltage. Portable navigation device.

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