JPH0615975B2 - Vehicle route guidance device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to GPS (Global Positioning System).
The present invention relates to a vehicle route guidance device including a position measurement device.

[Prior Art] An example of a conventional route guidance device for a vehicle equipped with a GPS position measuring device is disclosed in, for example, Japanese Patent Application Laid-Open No. S58-223017.

This is provided with a GPS position measuring device that performs so-called convergence calculation, and is configured to appropriately guide the route of the vehicle using the measured position.

However, in these conventional route guidance devices for vehicles, the general position data has to be manually input when the GPS position measuring device is initially started up. There was a problem that the means of requiring.

In addition, as one method to improve such problems,
The current location when the vehicle is stopped (when the ignition is off) is stored in the memory, and when you leave (when the ignition is off)
It is conceivable to provide the current position described in the memory to the GPS position measuring device to automatically start up the GPS position measuring device.

However, with this method, it is not possible to automatically start the vehicle when the vehicle stop position and the next departure position are different, such as when the vehicle is transported by a car ferry or car train, and in all cases. However, there is a drawback that it cannot be automatically started.

[Object of the Invention] The present invention solves the above problems and allows a GPS position measuring device to be automatically started even when a vehicle is transported by a vehicle transport system such as a car ferry or a car train. An object is to provide a guide device.

[Summary of the Invention] In order to achieve the above object, according to the present invention, as shown in FIG. The route guide means 2 that appropriately guides the route of the vehicle based on the current position, the ignition state detection means 3 that detects the on / off state of the vehicle ignition, and the current position when the ignition is off are stored as the vehicle stop position. A vehicle stop position storage means 4, a vehicle transfer system station data storage means 5 for storing station data of the vehicle transfer system, and a vehicle near a vehicle stop position by searching the station data when the ignition is turned on. Arrival that estimates the arrival station position when the vehicle is transported by the vehicle transport system as a starting point A station position estimating means 6 and a GPS automatic start-up means 7 for automatically initializing the GPS position measuring means based on an estimated value of the vehicle stop position or the arrival station when the ignition is turned on. Consists of
When the vehicle is transported by the vehicle transport system, the arrival station of the system can be set as the departure position of the vehicle.

Embodiments Embodiments of the present invention will be described below with reference to the accompanying drawings.

First, briefly explaining the drawings, FIGS. 2 to 8 show an embodiment of the present invention, FIG. 2 is a block diagram of a vehicle route guidance device, and FIG. 3 is a map used for route guidance. FIG. 4 is an explanatory diagram of map intersection information.

Further, FIG. 5 is an explanatory diagram showing the operating status of the car ferry, FIG. 6 is a data format of station data showing the departure place of the car ferry, and FIG. 7 is a data format of station data showing the arrival place of the car ferry, 8th
The figure is a flowchart of the GPS initial startup process.

As shown in FIG. 2, the vehicle route guidance device includes a system bus 8, a GPS receiver 9, a CPU 10, a system ROM 11, a volatile RAM 12A, and a non-volatile R.
The AM 12B, the sensor interface 13, the video RAM 14, the operation panel interface 15, the input operation unit 16, and the two types of external memories 17 and 18 are connected to each other.

The sensor interface 13 includes a distance sensor 19 that outputs a predetermined amount of pulse signal every time the vehicle travels a certain distance.
And a direction sensor 20 for detecting the traveling direction of the vehicle are connected. A CRT 21 is connected to the video RAM 14. The operation panel interface 15 has a CRT 2
A transparent operation panel (touch panel) 22 provided on the front surface of the No. 1 is connected.

The volatile RAM 12A is used as a work area for the CPU 10, and the non-volatile RAM 12B is
In order to automatically start the GPS receiver 9, the vehicle position when the ignition is off is stored and saved.

The external memory 17 is for storing map intersection information for route guidance, and the external memory 18 is a station of a vehicle transportation system such as a car ferry or car train for automatically starting the GPS receiver 9 ( Departure / arrival data is stored.

The GPS receiver 9 includes an antenna 9A, receives satellite radio waves from a predetermined number of satellites required for position calculation, and calculates the current position of the vehicle by convergence calculation.

Based on the program stored in the system ROM 11, the CPU 10 performs calculation of an estimated (integrated) position, correction of the estimated position, and other various route guidance processing.

The distance sensor 19 outputs a fixed amount of pulse signal every time the vehicle travels a fixed distance. The direction sensor 20 outputs a signal indicating the traveling direction of the vehicle. The CPU 10 inputs these signals through the sensor interface 13, detects the movement vector of the vehicle or the amount of scalar thereof, sums the movement vector to the reference position to obtain the current position of the vehicle, and this position is determined by the GPS receiver. The predetermined route guidance is performed while the time is corrected at the current position detected by 9.

The CRT 21 is for performing display for route guidance. The operation panel 22 is for inputting a departure place and a destination. The input operation unit 16 is formed by a so-called keyboard, and various value commands such as input of initial position data can be performed from here.

FIG. 3 shows a block map, and FIG. 4 shows a memory map of the external memory 17 created for the map.

As shown in FIG. 3, a map 23 represented by XY coordinates
Are blocks (1-1) and (1-
2), ... (3-3), and the external memory 17 is configured to store information regarding the map for each block.

The area start address storage area M1 shown in FIG. 4 is an area for storing the start addresses of the areas M2, M3, ...

The road data storage area M2 contains the start point and end point coordinates of the linearly approximated road line segment li shown in FIG.
This area stores information necessary for route guidance related to i.

The terrain (sea / river / railroad) data storage area M3 is an area for storing data on the sea, river, and railroad for route guidance.

The point (public facility or the like) data storage area M4 is an area for storing the point of the public facility or the like for route guidance.

The character data storage area M5 is provided with the CR for route guidance.
This is an area for storing character display data in T21.

The area name search data storage area M6 is an area for storing area names in units of cities, towns and villages for area name search in route guidance.

The CPU 10 performs route guidance processing while displaying an appropriate display on the CRT 21 by appropriately searching the map information.

Next, the contents stored in the external memory 18 will be described with reference to FIGS.

First, as shown in FIG. 5, it is assumed that four stations A, B, C and D are arranged on the land 24 so as to face the bay 25.

On the other hand, in the external memory 18, as shown in FIGS. 6 and 7, data 18A indicating the station of the departure place and data 18B for estimating the arrival place are stored in a predetermined format. There is.

As shown in FIG. 6, data 18A indicating the station of the departure place is stored with the position data of all the stations (A, B, C, D in the example of FIG. 5) that can be the departure place of the car ferry. The position coordinates of each station are stored in correspondence with each departure station storage address.

Further, as shown in FIG. 7, the data 18B for estimating the station of the arrival place is the data of the station designated by the address (eg, 5000) for the departure / arrival address for one receipt / delivery address shown in FIG. As an address of all stations that can be destinations (for example, 5004,500
8, 5000) and its position coordinates are stored. For example, in FIG. 5, data about stations B, C, and D are stored as arrival points for the station A at the departure point, and, for example, stations A and C are set as arrival points for the station B at the departure point. , D are stored.

With respect to the vehicle route guidance device having the above configuration, the process of initial startup of the GPS receiver 9 will be described with reference to FIG.

First, when the ignition is turned on, the process proceeds to step 8
01 is input. At this time, the current position (vehicle stop position) when the ignition is off is stored in the nonvolatile RAM 12A. In addition, in the state of the ignition off,
It is unclear whether the vehicle is in the previous stop position or has been moved to another position by the vehicle transport system such as a car ferry.

First, at step 801, it is checked whether three or more CPS satellites can be received. If three or more cannot be received, the GPS receiver 9 cannot be started up. Reset and return immediately.

If it is determined in step 801 that three or more are possible, the current position in the nonvolatile RAM 13 (vehicle stop position)
Is used as the initial startup data, and the startup is attempted in steps 803 and 804.

If it is determined in step 804 that the initial startup is possible, the side enable flag is set in step 805 to calculate the current position to converge, and the startup operation is completed.

On the other hand, if it is determined in step 804 that the vehicle stop position is too far from the true current position and startup is impossible, the process proceeds to step 806.

In steps 806 and 807, the contents of the data address (the storage position of the x coordinate) of the departure station of the car ferry and the contents 2 bytes above (the storage position of the y coordinate) shown in FIG. 6 are stored in the index register [SI]. [SI
+2], and substitutes this for variables x _F and y _F indicating the position of the departure station.

At step 808, the linear distance between the vehicle stop position (XY) and the departure station position (x _F , y _F ) is 500.
Check if it is within m.

If it is determined in step 808 that the distance is greater than 500 m, the departure station is incremented to the next station until the data end is confirmed via steps 809 and 811.

If the data end for the departure station shown in FIG. 6 is confirmed in step 809, step 8
In 12 to 814, it is assumed that the startup is performed manually.

When it is determined in step 808 that the vehicle stop position (X, Y) is near the departure station of the car ferry, in steps 815, 819 and 820, the arrival station shown in FIG. 7 becomes the data end. Estimated up to
At steps 816 and 817, initial startup is attempted at each estimated position.

If the data end is determined in step 820,
Moving to step 812, manual initial startup is performed here.

If it is determined in step 817 that the initial startup is possible, the process proceeds to step 821, where the positioning possible flag is set, and the initial startup is completed.

With the above processing, in this example, steps 806 to 811
The station as the departure place shown in FIG. 6 can be searched for, and the station as the arrival place can be searched for in steps 815 to 820.

In step 808 in FIG. 8, the search distance was set to 500 m when searching for the departure station, but this value can be freely set according to the situation.

Therefore, in this example, even if the vehicle is moved by the car ferry at the time of ignition off, the arrival station can be automatically indexed, and the indexed arrival station position is estimated as the current position of the vehicle and the GPS receiver 9 can be automatically initialized.

In the above-described embodiments, the example of the car ferry is shown as the vehicle transportation system, but the same applies to other vehicle transportation systems such as a car train.

The present invention is not limited to the above embodiment, but can be implemented in other modes by making appropriate design changes.

[Advantages of the Invention] As described above, according to the vehicle route guidance device of the present invention, the GPS position measuring device is automatically started even when the vehicle is transported by the vehicle transportation system such as a car ferry or a car train. be able to.

[Brief description of drawings]

FIG. 1 is a diagram showing an outline of the present invention, FIGS. 2 to 8 show an embodiment of the present invention, FIG. 2 is a block diagram of a vehicle route guidance device, and FIG. 3 is used for route guidance. Fig. 4 is an explanatory diagram of the map shown in Fig. 4, Fig. 4 is an explanatory diagram of map intersection information, Fig. 5 is an explanatory diagram showing the operating status of the car ferry, and Fig. 6 is a data format of station data showing the departure point of the car ferry. FIG. 7 is a data format of station data indicating the destination of the car ferry, and FIG. 8 is a flowchart of GPS initial startup processing. 1 ... GPS position measurement means 2 ... Route guidance means 3 ... Ignition state detection means 4 ... Vehicle stop position storage means 5 ... Vehicle transport system station data storage means 6 ... Arrival station position estimation means 7 ... GPS Automatic startup means

Front page continuation (72) Inventor Katsuhiko Mizushima 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd. (72) Inventor Akira Endo 2520, Takaba, Katsuta, Ibaraki Hitachi Sawa Factory

Claims (1)

[Claims] 1. A GPS position measuring means for determining a current position of a vehicle, a route guiding means for appropriately guiding a route of the vehicle based on the current position measured by the means, and an on / off state of an ignition of the vehicle. Ignition state detection means for detecting, vehicle stop position storage means for storing the current position when the ignition is off as a vehicle stop position, vehicle transfer system station data storage means for storing the station data of the vehicle transfer system, and when the ignition is on Arrival station position estimation means for estimating the arrival station position when the vehicle is transported by the vehicle transport system starting from a station near the vehicle stop position by searching station data; and the vehicle stop when the ignition is turned on. Position, or
A vehicle route guidance device comprising: a GPS automatic startup means for automatically performing initial startup of the GPS position measuring means based on the estimated value of the arrival station.