JPH04121619A - Moving body position display - Google Patents

Abstract

PURPOSE:To cope with bad receiving by a method wherein, when the state of receiving radio wave becomes bad, the direction to the destination, which has been displayed just before the bad state, is displayed on the screen with the direction indicator blinked, in a measuring position with the use of a GPS satellite. CONSTITUTION:A GPS position measuring system is provided with an antenna 1, a GPS integrated controller (ECU) 2, a display 3, a display control unit 4, a remote controller 5 and the like. The ECU 2 receives the radio wave of a GPS satellite so as to detect a position. The ECU 2 finds the distance between the position and the destination and the direction of the destination while the information of the destination direction and the like is transmitted to a display control unit 4. The display control unit 4 displays the destination direction. When a receiving state of the antenna 1 becomes bad, the display control unit 4 successively displays the destination direction having been displayed just before the state during the bad receiving state and stops the display when specified time passes.

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Application Field) The present invention is directed to receiving radio waves from GPS satellites on a moving object, detecting the current position of the moving object from the received information, and Destination information is stored in the device, and relative position information, such as the apparent direction from the moving object or the distance from the moving object to the destination, is displayed on the moving object from the current position and the destination information. The present invention relates to a navigation device on a moving body.

(Prior art) Radio waves sent from a GPS satellite are received by a moving object such as a car, the current position of the car is detected from the received information, the direction of the destination relative to the direction of travel of the car is detected, and this is displayed on a display. There is a mobile object position display device that displays (
For example, Japanese Patent Application Laid-Open No. 58-26214). This type of mobile object position display device sequentially displays the direction in which the vehicle should travel, and is therefore effective when driving in unfamiliar areas or when selecting a detour.

However, depending on where the vehicle is moving, it may not be possible to supplement the information from GPS satellites, and the current location may become unknown. In a general mobile object position display device,
If the GPS satellite information cannot be supplemented, the operator is notified that the location is unknown by not displaying the destination information display, but at this point the destination information becomes unknown. Therefore, devices have been proposed that display destination information as it was at the time when it was measurable, and separately display that the current location is unknown.

(Problem to be Solved by the Invention) However, in a moving object, it is difficult to keep looking at a navigation display, and generally the display is viewed intermittently and momentarily.

For this reason, when the location becomes unknown and the display disappears, unless you remember the display information (location information) just before the display disappears, it will be difficult to estimate the current location until the location can be obtained from the received radio waves. Since the display may disappear at any time, it is almost impossible to remember the position information just before the display disappeared.

When the location becomes unknown, the location information captured just before that time is continuously displayed, and the location information is also displayed separately.If you do not look at the display at the moment the location becomes unknown, the displayed destination information We do not know how far back the information is.

The present invention improves the above-mentioned problem when relative position information such as the apparent direction from a moving object or the distance from the moving object to a destination becomes unknown due to poor radio wave reception from a satellite. The purpose is to That is, the purpose is to make it easier for the user to recognize that the relative position information has become unknown, and for the user to subsequently estimate the relative position.

[Structure of the invention]

(Means for Solving the Problems) A mobile body position display device according to a first aspect of the present invention includes a receiving means (1) on a mobile body that receives radio waves from a GPS satellite; a signal received by the receiving means (1); Detects the current location based on. Current position detection means (2) on the moving body; storage means (40) on the moving body that stores the destination; storage means (40) on the moving body that detects the direction of the destination based on the detected current position; Destination direction detection means (23); Destination direction display means (AR) on the moving body that displays the detected destination direction.
): When the received information of the receiving means (+) becomes defective, from that point on, the destination direction display means (AR) continues to display the previous destination direction during the defective period and blinks it. A display control means (41) is provided which turns off the display when a predetermined period of time has elapsed from the point in time.

A moving body position display device according to a second aspect of the present invention.

Receiving means (1) on a mobile body that receives radio waves from GPS satellites
), current position detection means (2) on the moving body that detects the current position based on the signal received by the reception means (1); displays the reception status of the radio waves received by the reception means (], ); Satellite reception status display section (CD); receiving means (1)
When the reception information becomes defective, the reception status display on the satellite reception status display section (CD) blinks from that point on until the reception information becomes defective.
When a predetermined period of time has elapsed from that point, the satellite reception status display section (
Display control means (41) for displaying unreceivable on CD);
Equipped with

Note that the symbols in parentheses are corresponding elements in the embodiment described later.

(Operation) According to the first aspect, when the received information of the receiving means (+) becomes defective, the 1 display control means (41) displays the information immediately before the destination direction display means (AR) from that point on until the received information of the receiving means (+) becomes defective. The destination direction is continuously displayed and blinks, and when a predetermined period of time has elapsed from the point in time, the display is turned off.

Therefore, when reception is unavailable or the direction to the destination cannot be detected, the destination direction display will blink for a predetermined period of time, and the user will be able to see that the direction to the destination will become undetectable before the predetermined time even if it is longer than the blinking current time. Also, make sure that the direction of the destination immediately before it becomes undetectable is the one that is displayed in a flashing manner.
easily recognizable. This makes it relatively easy for the user to recognize that the destination direction has become unknown and for the user to estimate the relative position thereafter. Furthermore, since the user knows that the display will disappear after a predetermined period of time, he or she can take measures or be prepared for this.

According to the second aspect, when the reception information of the reception means (1) becomes defective, the display control means (41) displays the reception status of the satellite reception status display section (CD) from that point on until the reception information of the reception means (1) becomes defective. It blinks, and when a predetermined period of time has elapsed from that point, the satellite reception status display section (CD) displays unreceivable. Therefore,
When reception becomes unreachable, the satellite reception status display (CD) flashes for a predetermined period of time, and the user is informed that reception has become unreachable for the predetermined period of time, even if it is longer than the current time, and that the satellite reception status display (CD) blinks for a predetermined period of time. It is easy to recognize that the reception status of the receiver is displayed by blinking. Furthermore, since the user is aware that poor reception will be displayed after a predetermined time at most, he or she can take countermeasures or precautions to deal with this.

As mentioned above, users do not need to keep looking at the display all the time; if they spot it while the display is blinking, they can stop the moving vehicle and refer to the surrounding environment, map, etc. to re-recognize their destination. Therefore, there is no need to operate the mobile object while worrying about when the destination will be unknown or when satellite reception will become unavailable.

Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

(Example) FIG. 3 shows the configuration of a position display device for an automobile to which the present invention is applied. This device is installed in a car. Antenna 1. GPS (Global Positioning)
ngSys cover e11) integrated controller 2 (hereinafter referred to as E
CU), a display device 31, a table display control unit, and a remote control unit 5 (hereinafter referred to as a remote control).

Each part will be explained below.

(1) Antenna 1: Antenna 1 is installed on the outside of the vehicle and
Receive radio waves from S satellite.

(2) ECU2: Fig. 4 shows a schematic configuration of the ECU2. The ECU 2 includes a receiver 21, a coordinate converter 22, a CPU 23, a ROM 24, and a link circuit 25, and the receiver 21 further includes a receiver circuit 21+ and an arithmetic circuit 212. The receiving circuit 2 demodulates the radio waves from the GPS satellite received via the antenna 1, and the arithmetic circuit 212 calculates orbit data of the GPS satellite and distance data between the received position and the received position from the demodulated signal. do. The coordinate converter 22 calculates latitude data and longitude data of the reception position, that is, the current position of the vehicle, based on the data output from the receiver 21.

The ROM 24 stores, for each prepared map, the total number of pages in the atlas, the reference position data for each map on each page (latitude LAI of the lower left point of the map, longitude L01, and the upper right point of the map). The latitude LA2° and the longitude LO2), scale data, map inclination data, etc. are stored. In addition,
The map data includes wide-area map data that includes the largest scale wide-area map and a detailed map of a portion of the wide-area map, and map data of roads by prefecture that includes a city map and the details of a portion of the wide-area map.

The CPU 23 calculates the direction of the destination and the distance N( (straight line distance), etc., and further provides position data and calculation data to the display control unit 4.

The clock circuit 25 transmits an interrupt signal to the CPU 23 at predetermined time intervals.

(3) Display device 3: As shown in FIG. 5, the display device 3 includes a U-shaped frame 30 and a group of LEDs 34-1 to 31-1 for displaying the X coordinate. Y
It includes coordinate display LED groups 32-1 to 32J and a transparent plate 33.

The X-coordinate display LED group 31-1 to 31-■ is one in which l LEDs are arranged linearly along one side of the frame 30. In addition, Y coordinate display LED #32-1 to 32
-J is one LED along another side of the frame 30;
are arranged linearly. The LED groups 31-1 to 31-I for displaying the X coordinate are, from right to left, the LED for displaying the Y coordinate.
The groups 32-1 to 32-J are numbered from top to bottom, forming an X-Y coordinate system.

The transparent plate 33 is a transparent plate that covers the atlas (see FIG. 2) 34, and includes the X coordinate display LED groups 31-1 to 31-1.
．． Parallel grids are drawn on each of the Y-coordinate display LED groups 32-1 and 32-j. That is, when the transparent plate is placed over the atlas 34, the XY matrix line is superimposed on the atlas 34.

(4) Remote control 5 Fig. 6 shows a plan view of the remote control 5. A large number of key switches for setting route points are arranged on the remote control 5. The functions of each key switch are as follows.

501゛Used when manually switching to the next registered point.

502゛Used to display the total remaining distance.

503: Used to switch the map to be used when there are multiple maps of different scales including the current location.

504: Used to reverse the reading order of registered points on the outbound and return trips.

505: Used when using another map.

506: Used when setting routes and registered points.

507: Used when selecting one from a plurality of registered routes.

508 to 511: Used for operations such as switching displays and selecting operations.

512 is used to switch between the right side and the left side of the spread page of the map.

513°Used when powering on/off and clearing data.

514: Used when inserting data.

(5) Display control unit 4: FIG. 7 shows the circuit configuration of the display control unit 4. The display control unit 4 includes a controller 41° interface circuit 43, 46, 47 . Drive circuits 45, 49. It consists of a remote control receiving circuit 44, a memory circuit 40, and the like.

The controller 41 is given latitude data, longitude data, etc. of the current position of the vehicle from the ECU 2 via the input/output interface 43. Further, the controller 41 reads the operation of each key switch of the remote control 5 via the remote control light receiving section 48 and the remote control receiving circuit 44, and displays necessary information on the display panel 42 via the drive circuit 45. In addition, the LEDs 31-1 to 31-1 for displaying the X coordinate are connected via the output interface 46, and the LED groups 32-1 to 32-J for displaying the Y coordinate are connected to the LED group 32-1 to 32-J via the output interface 47.
The lighting is controlled respectively. Further, the controller 41 causes the buzzer BZ to sound via the drive circuit 49 as necessary.

Note that the memory circuit 40 includes a route A, as shown in FIG.
Four destinations: route B, route C1 and route D.
There are areas that can store location data of transit points, and each area can store information (location information) for up to 9 points.
can be registered.

FIG. 8 shows the display section of the display control unit 4.

The display on the display unit 42 will be explained below.

RD: Displays the remaining distance to the destination.

TG: Route area (A to D) and route number (
1 to 9) are displayed.

FB: Either one of the LEDs lights up during the forward trip and during the return trip.

PM: Display the atlas number.

PP: Displays the page number of the atlas.

RA: Displays the map scale in three levels: wide area, city, and detailed.

DR: One of the 12 lights lights up to indicate which direction north is relative to the current direction of travel.

AR: One of the 12 lights lights up to display the direction of the destination relative to the current direction of travel.

The reception status of up to 5 satellites is displayed by lighting up CD + LED1 to LED5.In addition, the display unit 4
Immediately next to 2, there is a connector 46 for connecting a light receiving section 48 for light emitted from the remote controller 5 and the display device 3.

FIG. 1a shows the content of arithmetic processing by the CPU 23 of the ECU 2. First, latitude data LA (Latitude) and longitude data LO (
(Step 1: Hereinafter, the word step will be omitted in parentheses).

Next, the standard pig associated with the map specified by the map number PM and page number PP at this time, that is,
The latitude LAI and longitude LO1 of the lower left point of the map, and the latitude LA2 of the upper right point of the map. Read the longitude LO2 and place LA in the rectangular area specified diagonally by these points.
And it is checked whether the current position of the car indicated by LO exists (2.3).

If the current position of the vehicle indicated by the variables LA and LO is not on the map specified by the map book number PM and page number PP at that time, the process proceeds to step 4 and a search process is performed.

The contents of the search process (4) are shown in FIG. 1b. In this process, first, the atlas number PM is specified and 6711+all pages of the book & PNM! ! Output 5-1), page counter PC, page number PP, wide area map page number WP,
City map page number MP and detailed map page number DP
Clear the variables DS11$, DS12$, DS13$
Assign 0 to (5-2).

Thereafter, while updating the page number PP one by one, the presence or absence of the current position is checked with respect to the map specified by the page number PP in the same manner as above (5-3.5-4). At this time, if the current position exists in the map being considered, the page counter PC is incremented by 1 (5-5), and if it is a wide area map, "W" is substituted into the variable DSll$ and the wide area page number is Set WP to the current page number PP, and if it is a city map, substitute M'' to the variable DS12$ and set the city map page number MP to the current page number PP.
If it is a detailed map, set the variable DS13$ to “D”.
is substituted and the detailed map page number DP is set to the page number PP at that time (5-6.5 to 7).

When the above consideration is carried out regarding the maps of all pages of the atlas specified by the atlas number PM (5-8), if there is a map that includes the current location in the atlas, the page counter P
C is 1 or more, and when it is absent, it is 0. Therefore, when the page counter PC is 0, the map book number PM
is incremented by 1, and the above search process is repeated from the beginning (5-9, 5-10).

However, when the map book number PM is incremented by 1 and its value exceeds the total number of map books MM, the value is set to 1 (5-11. S-12).

It is b cult'll that the page counter PC is 1 or more and that there is a map that includes the current location in the atlas being considered.
Number DS 11s, DS 12S Oyo UDS13$
Assign the code of the combination in this order to the variable DS1$ (
5-13). That is, the variable DS1$ is assigned a code as shown in Table 1 below depending on the number of maps including the current location in the atlas and the type of each map.

Table 1 However, in the above Table 1, "0" indicates that the current position is included, and "X" indicates that the current position is not included.

Finally, a page of the map suitable for display is set as the page number PP. In this embodiment, priority is set in the order of city map, wide area map, and detailed map in order to read the position and change the map as the vehicle moves. Therefore, if the city map page number MP is not O, the value is use,
The city map page number is O, and the wide area map page number W
When P is not 0, that value is used, and when the city map page number MP and wide area map page number WP are 0, the detailed page number DP is used to set the page number PP (5-14.5-15).

In this way, the atlas number PM that specifies the atlas that has the map including the current location and the page number PP that specifies the map are obtained through the search process.

Referring again to FIG. 1a. After detecting the current position,
The distance between the current position and the destination (position data transferred by the display control device described later).

That is, the residual pressure MRD is determined, the direction of north relative to the vehicle is determined based on the change in the current position, and the direction of the destination is determined (5, 6.7).

In addition, the atlas number PM, page number PP, and location data (
Latitude data, longitude data) and data such as the destination direction determined by calculation are transferred to the display control unit 4 by an interrupt process shown in FIG. 1c. That is, CPU2
3, an interrupt signal is input by the clock circuit 25 at fixed intervals (approximately -second intervals in this embodiment), and when this interrupt occurs, data is transferred (I+). If there are no pigs to transfer due to unreceivable data, etc., information indicating no data is transferred (10
．． 12).

Next, the operation of the controller 41 will be explained with reference to the main flowchart of the controller 41 shown in FIG. 2a.

First, when the power is turned on, an initialization process is executed to initialize the input/output board, initialize flags and variables, etc. (Sl).

Next, execute the reading process to read the key operation input (S2)
, selects and branches the process associated with the operated key switch (S3), that is, when the key switch 502 is operated, the total remaining distance display process (S44) is executed, and when the key switch 503 is operated, the scale is displayed. Change processing (341)
When the key switch 504 is operated, the outbound/return route switching process (S45) is executed, when the key switch 505 is operated, the map change process (343) is executed, and when the key switch 506 is operated, the destination input and change process (342) is executed. ), when the key switch 507 is operated, the route change process (S46) is executed, and when the key switch 512 is operated, the L/R change process (S46) is executed.
S47) are respectively executed. Note that details of each process will be described later.

After that, the controller 41 receives the latitude data from the ECU 2.
Check whether the longitude data, map data, etc. have been transferred (S5), and if the data has been transferred, the ECU
When an error is displayed, please clear this S6), 30 seconds
The timer is restarted (S7) and the transferred data is read (S8). This 30sec timer is
This is a timer to check that no data arrives for more than 30 seconds.

After that, a data error check is performed (SIO).

If there is a data error, a data error is displayed and the process returns to step S2 (513). If not, arithmetic processing (S14) and display alarm processing (315) are performed, and the process returns to step S2. Details of the arithmetic processing (514) and display alarm processing (315) will be described later.

If no data is sent from the ECU 2 in step S5, check whether the 30 sec timer has timed out (511); if not, return to step S2 again, but if so, the ECU 2 is abnormal. An ECU error is displayed (512).

That is, the controller 41 performs processing (341-347) corresponding to the key operation input, takes in data from the ECU 2, and performs calculation and display control based on each processing result and the data from the ECU 2. If there is an abnormality in the data, a data abnormality display is performed, and if data does not arrive from the ECU 2 for a certain period of time or more, it is determined that there is an ECU error and an ECU error display is performed.

FIG. 2b shows the contents of the scale change process (541).

Here, each time the key switch 503 is operated, the page number PP is updated according to the conditions indicated by the page number PP, wide area map page number wP, city map page number MP, and detailed map page number DP (41- 1.41-
2). In other words, when the key switch 503 was operated, the selected map was a wide area map (PP=WP).
And when there is a detailed map including the current location (DP≠0),
Or, the map selected at that time is a city map (
PP=MP) and there is a detailed map including the current location (
DP≠0), set the detailed map DP to the page number PP and set “OOD” to the variable DS2$ (41-
2-21.4 l-2-22). In addition, key switch 5
When the operation in 03 is performed, if the selected map is a detailed map (PP=DP) and there is a wide area map that includes the current location (WP≠0), the wide area map W is set to the page number PP.
P and the variable DS2$ are set to "woo" (41-2-31.4l-2-32). Furthermore, if the selected map is a detailed map (PP=DP) and there is a city map that includes the current location (MP≠0) when the key switch 503 is operated, the page number PP is set to the city area. Set the figure MP to 0MO' in the variable DS2$ (4]-2-11°4l-2-12). In addition,
Nothing is done when a key is operated under conditions other than these.

After this, if the value of N is 0, set it to 1 and set the variable DS$
Set the value of variable DS1$ to 41-3,414),
If variable N is 1, set it to 0 and set variable D to variable DS$.
Set the value of S2$ (41-3, 41-5), instruct the drive circuit to display the contents (41-6), and return.

As mentioned above, the variable DS1$ is set with a code indicating all maps including the current location, that is, the type of map that can be selected, and the variable DS2$ is set with a code indicating the type of map selected at this time. Since this is set, while this scaling process is being executed, codes indicating the selectable map type and the selected map type are displayed alternately.

FIG. 2C shows the contents of the destination input and change process (S42). First, the destination that was set (displayed) before the key switch 506 was pressed is memorized (4
2-1). Next, enter the route number set in the route change process (546) to be described later in the register KC to 42 cents.
-2) Based on the set route number, step S
A process of branching to one of 50 to 353 is executed (42-3).

If KC=1, route A is selected (42-4).

Thereafter, route number selection processing is performed to select areas (numbers 1 to 9) for storing a plurality of position information on route A (42-5). The contents of this route number selection process (42-4) are shown in FIG. 2d.

In the process shown in the second driA, first, key operation input is read and a route number manual display instruction is given (42
-4-1, 42-4-2). In this display, the route number that was displayed before entering the destination input and change processing is flashed. Note that when there is no data within the area, route 0 is displayed (0 is displayed on TG of the display section 42).

When the key switch 51 is operated, the currently displayed route number RC is decremented by 1 and the process returns. Note that the lower limit of RC is 1 (42-4-
4-42-4-6). Further, when an operation input is made to the key switch 509, the value of the currently displayed route number RC is incremented by 1 and the process returns. Note that the upper limit of RC is the number of route numbers already registered.
The value shall be 1 greater than RC and 9 or less (42-4-7
-42-4-11).

Referring again to Figure 2c. When KC=1, the route A selection and route number selection (350) described above are performed, but when KC=2, route B is selected, when KC=3, route C is selected, and when KC=4, route D is selected. , and then select a route number. Note that the processing for routes B, C, and D is similar to that for route A, so the explanation will be omitted.

Then insert key 514. Check whether the clear key 513 and setting key 516 have been pressed. When the insert key is pressed: 1 In this embodiment, the maximum number of points that can be set as the destination and waypoint for one area is 9 points, so if the MRC value is not 9, the route number mentioned above is used. The data in the area after the route number area selected in the selection process is shifted to the next route number area, the position setting process is performed on the current route number area, and the MRC value (the route where the information is stored) is shifted to the next route number area. (number of numbers) is incremented by 1 (42-9 to 421
2). For example, if position data is currently stored in routes A1 to A4, and route A3 is selected in the route number selection process and the push key 514 is pressed, the data of A4 is stored in A5, and the data of A3 is stored in A4. Shift and perform position setting processing for A3. In addition, MR
The value of C is updated from 4 to 5. Position setting process (42-
The details of 11) will be described later.

When the clear key 513 is pressed, the data of the currently selected route number is deleted, and the data stored in the route number area after the current route number is moved to the previous route number area. Shift and decrement the MRC value by 1 (42-7.42-
13, 42-14). For example, currently routes A1 to A4
If the position data is stored in , and if you select route 1-A2 in the route number selection process and press the clear key 513, first delete the pig in A2 and transfer the data in A3 to A2.
Then, shift the data of A4 to A3, and
Update the RC value from 4 to 3.

Further, when the setting key 516 is pressed, position setting processing is performed and the value of MRC is incremented by one. Insert key 514. Clear key 513 and setting key 516
If none of the buttons are pressed, the process returns to step 42-1, and a route can be selected.

After setting or changing the route data, it is necessary to press the route change key 507 or call key 506. If the route change key 507 is pressed, the current
Set the location selected by route number selection as the destination (42-17.42-Il). Also, if the call key 506 is pressed, the route destination and the location before executing the change process (346) are set. Set the destination (destination stored in 342-1) as the destination (42-19.
42-20).

By setting and changing the route data as described above, the route data and the like are stored in the storage circuit 40 as shown in FIG.

The process shown in FIG. 2e and below, which will be explained below, is a process for displaying navigation on a car.

The contents of the position setting process (42-II) are shown in the second erjlJ.

In this process, when the user manually specifies a route stored in the storage circuit 40 as described above, a display is displayed regarding the selected route. Note that this is the same process as the position setting process in step 42-13.

First, set flag F, set O to map book number MN and page number PN for position display setting, and set 1 to numbers XC and XY of each LED pair (10
1).

Next, the key switch operation is read, the atlas number MN and page number PN are displayed on the liquid crystal display 32, and each LED pair specified by the numbers XC and YC is lit (+
02). At this time, each time the setting key 516 is operated, the flag F is incremented by 1 L (103, 104), and the process branches according to the value of the flag F (105).

When the flag F is O, the drive circuit 45 is controlled in step 106, and a "map input" message is sent, that is,
The map number is displayed blinking on the display part PM.

After this, each time the key switch 508 is input, the atlas number is incremented by 1 (III), and the key switch 51
Every time there is a 00 input, it is decremented by 1 (108
), but with this update, all map book numbers MN are J1! ! When the value exceeds the number of map books MM, it is set to 0 (112,113), and when the value is 0, it is set to the total number of map books MM. (+09. J 10).

The map number MN updated here is sequentially updated at step +02.
is displayed on PM on the display section 42.

When the flag F is I, the drive circuit 45 is controlled in step 14 to display a 6-page input message, that is, the page number display part blinks. The number is incremented by 1 (119), and every time the key switch 510 is input, it is decremented (+16), but when this update causes the page number PN to exceed the total number of pages PNM, it is sent to O. 120, 121)
, When the value is 0, it is calculated as the total number of pages PNM.
Set to .

(117, 118). The page number PN updated here is sequentially displayed on PP of the display unit 42 in step 102.

When the flag F is 2, the number increments the number
+31). However, the number XC is a number that specifies one of the LED pairs constituting the X-coordinate display LED group 31-1 to 31-■.

When the value exceeds I, it is returned to O, and when it becomes less than 0, it is set to I. Similarly, the number YC is Y
This number specifies one of the LED pairs that make up the coordinate display LED groups 32-1 to 32-J, so when the value exceeds J, it is returned to 0, and when it is less than 0, it is returned to 0. Set J. The LED pair identified by the updated numbers XC and YC is illuminated in step 102.

When the flag F becomes 3, the map book number MN, map book page number PN, and coordinate (XC, YC) data are stored in a predetermined area of the storage circuit 40 as position information, and the data is transferred to the ECU 2. do.

Note that the ECU 2 calculates the latitude LAe and longitude LOe of the point (destination) set in this way, calculates the distance and direction of the destination from the current location of the car, and displays the calculated data on the display device 4. and display device 4
displays distance, direction, etc.

FIG. 2f shows the contents of the map change process (S43).

When the map change key 505 is pressed, first, 5 seconds
Start a timer (43-1). Next, if there is an input before the 5 sec timer times out (43-3)
, sets the atlas number PM to 0 (43-5).

After this, the input is read and the PM is displayed (43-
6, 43-7), the map book number PM is incremented by 1 each time the key switch 508 is input (43-9), and it is decremented by 1 each time the kiss inch 510 is input (43-12). However, in this update, if the atlas number PN exceeds the total number of atlases MM, it is set to 0 (43-10.43-I+), and when it becomes 0, it is set to the total number of atlases MM (43-10.43-I+). -13.43-14
). The map book number updated here is sequentially updated in step 43.
-7, it is displayed on PM of the display section 42.

Note that if there is no input before the 5-sec timer times out, automatic map change processing will be performed (43
-4). In this automatic map change process, if a wide area map is currently being used, it is changed to a city map that includes the current location. Also, if a city map is currently being used,
The map will automatically change to a wide area map that includes your current location.

Next, the contents of the total remaining distance display (S44) will be explained.

When the key switch 502 is pressed, the total remaining distance is displayed, but in this process, the total remaining distance is displayed. Performs processing to calculate and display distance.

Note that the calculated total remaining distance is blinkingly displayed on the remaining distance display section RD of the 1 display panel 42 for a certain period of time (about 5 seconds).

FIG. 2g shows the contents of the forward/return route switching process (345). This process is roughly a process of selecting between a process of reading out the information stored in the root numbers in the order of the root numbers and a process of reading out the information in the reverse order of the route numbers.

First, the route number set in the "route change process" is set in the register KC (S61). Next, the sign of the flag GB indicating the order of reading information is inverted (S62).

Based on the route number set in the register KC, a process branching to steps 364 to 567 (route reading process) is executed (S63).

Each of steps 364 to 367 has the same processing content, so step 364 will be explained and the others will be omitted.

FIG. 2h shows the route reading operation in step 364. First, the flag GB is positive (check whether GB=1 or not (3641)), and if so, the information stored in the route destination setting and changing process (S42) is read out in the order of the route number (<5642 to 3644). Note that the position information read out in step 5643 is stored in the root memory of the storage circuit 40 and referred to when necessary.

On the other hand, if the flag GB is negative (GB=-1), the information stored in the route destination setting and changing process (342) is read out in reverse route number order (3646 to 364).
9).

Note that RC is a counter for sequentially reading out position information (destination), and MRC is a route area (for example, route A).
indicates the number of route numbers for which information is stored.

Next, the contents of the route change process (34G) will be explained. In the route change process, each time the key switch 507 is pressed, the value of the register is incremented by one. Note that when the value of the register becomes larger than 4, it becomes 1 again. Select route A with register = 1, select route B with register = 2
, select route C in register 3, and select route D in register 24. That is, a process is performed in which one route is sequentially selected from among the four stored routes (routes A to D). Note that the symbol of the selected route is displayed on the TG of the display section 42.

Next, the L/R change process (347) will be explained.

In this process, the key switch 512 is pressed.

A process of switching R alternately is performed. L is specified when setting the position on the left page of the double-page spread of the atlas 34. Similarly, R is specified when setting the position on the right page of the double-page spread of the atlas 34. Note that when L is specified, the character ``R'' located immediately to the left of PP on the display section 42 is lit up, and when R is specified, the character R located immediately to the left of PP on the display section 42 is displayed. It will be displayed lit. Incidentally, when displaying the position using the LED 31 and the LED 32, either of the R lights up along with the page number of the required atlas.

Next, the arithmetic processing (S5) will be briefly explained.

In this process, the position data (latitude data LA, longitude data LO) sent from the ECU 2, the latitude LAI and longitude LOI of the lower left point of the map where the position exists, and the latitude LA2 of the upper right point of the map ．． Based on longitude LO2,
The current position is converted into the X-Y coordinate system on the display device 3, and the optimal X line and Y line for displaying the current position are selected. More specifically, X = (LO-Lol)・(++1)/(LO2-L
OI) ・ ・ ・ (1) and Y = (LA-LA1)・(J÷1)/(LA2-L
AI)... Perform the calculation shown in (2) to find the X coordinate X and Y coordinate Y of the current position on the map, and then
By rounding off the coordinate X, the number XC of the LED pair at both ends of the Y line that is optimal for display is determined, and by rounding off the Shobara Y, the number 4-yc of the LED pair at both ends of the X line that is optimal for display is determined.

FIG. 21 shows the operation of the display alarm process (S6).

First, map book number PM, page number PP, scale (wide area,
city, details) on the display 42 (+5-
l-15-3). Also, the LED lighting display corresponding to the XC1XY data is displayed on the display device 3 (+5-4) 6 After that, check whether measurement is possible +5-5), and if so, restart the 3-minute timer T1 L (+5-4) 9),
Lights up to display the reception status of radio waves from the satellite and remaining distance (+5-10). In addition, if the 3-minute timer T1 has not timed out because measurement is impossible (due to poor reception of satellite radio waves, etc.), that is, if the predetermined time (3 minutes) has not elapsed since measurement became impossible, the satellite The reception status is displayed blinking on LEDs 1 to 5 of the display unit 42, and the remaining distance is displayed on the LEDs 1 to 5 of the display unit 42 (+
5-6 to 15-8).

After that, check whether the current position is detectable and the direction is uncertain (15-13) L. If not,
Restart the 3 minute timer T2 and the car speed is 25km/h.
Display the destination position on condition that it is h or more (
+5-17-15-19). Note that the speed data output from the arithmetic circuit 212 is used for the speed of the vehicle. The direction of the destination is displayed as shown in FIG. 10th
The example shown in the figure shows that the car is currently traveling in the south direction and the destination is in the east direction.

Furthermore, if the 3-minute timer T2 has not timed out due to the direction becoming uncertain, that is, if the predetermined time (3 minutes) has not elapsed since the direction became uncertain, the destination position is displayed blinking (+5- 14~+5-16).

If the remaining distance is greater than or equal to the predetermined value, the vehicle will return; if the remaining distance is less than the predetermined value, the vehicle will sound the buzzer BZ, change the destination (relay point) to the next destination, and return (
+5-21 to 15-23).

On the other hand, when a predetermined period of time (+5-16) has elapsed since measurement became impossible in step 15-5, the satellite reception status is displayed by lighting, the remaining distance display is turned off, and the destination position display is turned off. Return (+5-II, 15-12.15
20). Further, when a predetermined period of time has elapsed since the direction became uncertain in step 6-13 (15-14), the display of the destination position is turned off and the process returns (15-20).

〔Effect of the invention〕

As described above, according to the present invention, the display control means (41)
When the reception information of the receiving means (1) becomes defective, from that point on, the destination direction display means (AR) continues to display the previous destination direction and blinks it for a predetermined period of time from that point onwards. When the time has elapsed, the display disappears. Further, when the reception information of the receiving means (1) becomes defective, the display control means (41) continuously displays the satellite reception status just before that on the satellite receipt display section (CD) during the defective period. And it blinks to indicate that reception is not possible when a predetermined period of time has elapsed from that point. Therefore, when reception is unavailable or the destination direction cannot be detected, the destination direction or satellite reception status display blinks for a predetermined period of time, and the user can detect the destination direction before the predetermined time even if it is longer than the current time. Alternatively, it can be easily recognized that satellite reception has become impossible, and that the destination direction or satellite reception status immediately before it became undetectable is displayed in blinking. This makes it relatively easy for the user to recognize that the destination direction or satellite reception state has become unknown, and for the user to subsequently estimate the relative direction.

Furthermore, since the user is aware that the destination direction display will turn off or the satellite reception failure display will be displayed after a predetermined period of time at most, the user can take countermeasures or preparations in response to this.

As mentioned above, users do not need to keep looking at the display all the time; if they notice it while the display is blinking, they can stop the vehicle and reconfirm their destination by referring to the surrounding environment, map, etc. Therefore, there is no need to operate the mobile object while worrying about the destination direction or satellite reception status becoming unclear.

[Brief explanation of drawings]

1a, 1b, and 1c are flowcharts showing control operations of the CPU 23 of the electronic control unit (ECU) 2 shown in FIG. 4. FIG. Figure 2a, Figure 2b, Figure 2c, Figure 2d, Figure 2e,
Figures 2f, 2g, 2h, and 21 are
8 is a flowchart showing the control operation of the controller 41 of the display control unit 4 shown in FIG. 7. FIG. 3 is a perspective view showing a schematic configuration of a position display device for an automobile, which is an embodiment of the present invention. FIG. 4 is a block diagram showing the configuration of the display control unit 4 shown in FIG. 3. FIG. 5 is a perspective view showing the appearance of the display device 3 shown in FIG. 3. FIG. 6 is an enlarged plan view showing the external appearance of the remote control 5 shown in FIG. 3. FIG. FIG. 7 is a block diagram showing the configuration of the ECU 2 shown in FIG. 3. FIG. 8 shows the display section 4 of the display control unit 4 shown in FIG.
FIG. 2 is an enlarged plan view showing the external appearance of FIG. FIG. 9 is a memory map conceptually showing the data stored in the storage circuit 40 of the display control unit 4 shown in FIG. FIG. 10 is an enlarged plan view showing an example of the azimuth/direction display state of the display section 42 of the display control unit 4 shown in FIG. 8. l: Antenna (receiving means) 2° ECU (current position detecting means) 21, Receiver 22: Coordinate converter 23: CP
U 24 ゛ ROM 25: Clock circuit 3: Display device 30 degrees frame 31 degrees : Controller (display control means) 42' Display section CD: Satellite reception status display section (satellite reception status display section) AR: Traveling direction display section (destination direction display section) RD: Distance display section 43' Input/output interface 44 :Remote control receiving circuit 45.48:Next path 46.47:Output interface 48:Remote control receiver Z Buzzer remote control

Claims (2)

[Claims] (1) Receiving means on the mobile body that receives radio waves from GPS satellites; Current position detection means on the mobile body that detects the current position based on the signal received by the reception means; Mobile body that memorizes the destination. Storage means above; Destination direction detection means on the moving body that detects the direction of the destination based on the detected current position; Destination direction detection means on the moving body that displays the detected destination direction display means; and, when the reception information of the receiving means becomes defective, from that point on, the destination direction display means continues to display the immediately preceding destination direction during the defect, and it blinks until a predetermined period of time has elapsed from that point. A display control means for erasing the display when the display is displayed. (2) Receiving means on the moving body that receives radio waves from GPS satellites; Current position detection means on the moving body that detects the current position based on the signal received by the receiving means; The radio waves received by the receiving means a satellite reception status display unit that displays the reception status of the satellite reception status display unit; when the reception information of the receiving means becomes defective, the reception status display of the satellite reception status display unit blinks from that point on until the reception information becomes defective;
A mobile object position display device, comprising: display control means for displaying unreceivable on a satellite reception status display unit when a predetermined period of time has elapsed from the time.