JPS62293500A - Running information display unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] This invention provides an in-vehicle navigation device that automatically displays the current position without the need for complicated error correction of the current position display. The present invention relates to a driving information display device in which resetting is performed.

[Conventional technology]

Regarding in-vehicle navigation devices, for example, Japanese Patent Laid-Open No. 59-204.081 and Japanese Patent Laid-open No. 58-1782
The latter is disclosed in Publication No. 14, etc., and in the latter case, a mileage detector that detects the distance traveled by the vehicle, a direction detector that detects the current direction of travel of the vehicle, and a display that displays the current position of the vehicle. The current position is recognized in spherical or orthogonal coordinates, and the current position is calculated, updated, and displayed as the vehicle travels.

[Problem that the invention seeks to solve]

However, in the above-mentioned in-vehicle navigation device, since there are measurement errors of the mileage detector and direction detector and calculation errors when calculating the current position, these become cumulative errors as the vehicle travels9 and are calculated. The current position of the vehicle begins to deviate from the actual position of the vehicle. In order to correct this, complicated operations such as resetting the current position must be performed.

This invention was made to solve this problem, and allows the user to avoid the complicated error correction of the current position display.
However, the current location is automatically reset, which is a burden on the user! An object of the present invention is to obtain a driving information display device capable of navigation with good accuracy.

[Means for solving problems]

The driving information display device according to the present invention includes a point memory in which specific point information is registered in advance, and whether the vehicle has returned to the specific point based on the distance between the location information registered in the point memory and the current location and the parking time. control means for determining whether or not the current position is correct, correcting the cumulative error, and resetting the current position.

[For production]

In this invention, the control means determines whether the vehicle has returned to a specific point based on the distance between the location information registered in the location memory and the current location information and the parking time.
When the vehicle returns to a specific point, the cumulative error is corrected and the vehicle's current position is reset.

〔Example〕

Embodiments of the travel information display device of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of one embodiment. In FIG. 1, 1 is a travel distance detector that generates a signal with a frequency proportional to the traveling speed as the vehicle (not shown) travels, and 2 is a direction detector for measuring the traveling direction of the vehicle. , 3 is a map memory that stores information such as roads on the map.

These travel distance detector 1, direction detection Ia2, and map memory 3 are connected to a control circuit 5. The control circuit 5 further includes a traveling trajectory display device 4 (hereinafter referred to as a display device), a marker moving device 6, a switch 10. Point memory 11
The connection is also broken.

The point memory 11 is a memory for storing specific point information, and the display 4 is for displaying the map information, point information, and travel trajectory provided by the map memory 3 and the point memory 11.

The control circuit 5 reads data from the map memory 3 and the point memory 11, displays the map and point information on the display 4, calculates the travel trajectory and displays it on the display 4, and also determines whether to correct the current position. This is a control circuit for execution.

The marker moving device 6 is for moving a marker (hereinafter abbreviated as current position marker) that indicates the current position of the vehicle being displayed to an appropriate position.

The switch 10 is a switch for instructing the control circuit 5 to select a control mode.

As the direction detector 1, a method of measuring the direction of earth's magnetism, a method of using a gyro, etc. can be considered, but the following explanation will be about a method of measuring the direction of earth's magnetism. However, even if other methods such as a gyro are used, the principle of calculating the running trajectory is almost the same.

As the direction detector 2, a magnetic sensor having two orthogonal detection axes is used.As shown in FIG. The direction detector 2 is installed at an arbitrary position on the vehicle 7 so as to be placed in a horizontal plane perpendicular to the direction of travel.

Consider a case where the vehicle is placed so that the direction of travel of the vehicle forms an angle θ with magnetic north. In this case, when the magnitude of the horizontal component of geomagnetism is H, the magnetic field components Hu and HV in the direction of the two detection axes of direction detection PJ2 are H, J-, and H(1)θ
, HV= is given by 2H θ.

Here, K is a constant determined by the structure of the vehicle, and K and K are approximately equal. In the following explanation, = ni = ni' will be used for simplicity, but this does not result in the loss of -membrane properties.

When the aforementioned magnetic field is applied to the orientation detector 2, the two electrical output signals EIJ and EV obtained from the orientation detector 2 are EU=AHu=AK' Hcsaθ, EV=AK'
Has(i) where A is a constant related to the sensitivity of the direction detector 2.

In the above equation, if we replace AK'=, E,=KH
caoθ, EV=KHomθ. As shown in FIG. 2, the coordinate axes (X, YJ) are determined so that the Y axis corresponds to north and the X axis corresponds to east.

In the state shown in Fig. 2, when the vehicle 7 moves by a minute distance d in the direction of travel, let ΔX and Δy be the moving lids of the s1 in the X direction and Y direction, respectively, then ΔX and Δy1 are expressed by the following formula. Given.

Δx=d(g)θ, Δy=dθ ・・・・・・・・・
...(1) ◇l++ 0---', and Eu'+E
,'=2H2, so H works θ-Eu/-/Eu! −? −Ev, θ; E1/~
/T'7+E, and from equation (1), Δx=d-Eu/Q. Δy = d − E, / %
/E1. +2-)-E,! ...(2) becomes. As shown in Figures 3(a) and 3(b), if the latitude of the current position is β, the longitude is α, and the radius of the earth is r, then
ΔX and Δy are the latitude and longitude variations Δβ according to the following equations.

It can be converted into Δa.

Δβ=Ay sub° ... Curve (4) r π Using this formula, the current position of the vehicle is calculated and updated based on latitude and longitude. - Therefore, the current position 1iWQ(a, β) after traveling from an arbitrary point P as a starting point is a=α at point P.

After β-β9, it is obtained by adding Δa and Δβ to a and β, respectively, as the vehicle moves a small distance d, and from point P to point Q (a.

The travel trajectory is the one that connects the points given by β).

As mentioned above, the mileage detector 1 generates a signal having a frequency proportional to the moving speed of the vehicle, but when this signal is converted into a pulse, one pulse is generated every time the vehicle travels a certain distance d. It's going to be a long time ago.

Therefore, it is easy to understand that the control circuit 5 can perform the process of adding Δa and Δβ to α and β, respectively, each time a pulse is obtained from the travel distance detector 1, or calculate the travel trajectory and current position. reactor.

Next, the marker moving device 6 will be explained. In the M4 diagram, 0 indicated by M is an example of the current position marker, and the point at the center of the circle indicates the current position. Map data from Map Memozu 3
! ! When the map is read out and displayed on the display 4, the current position marker M1 is located approximately at the center of the screen of the display 4.

Before moving 11 cars 7, it is necessary to move the current position marker M to the current position on the map. The marker moving device 6 is used for this purpose.

FIG. 5 shows a specific example of the marker moving device 6, in which switches 61, 62, 63, and 64 move the current position marker M to the right, left, top, and bottom of both sides of the display 4, respectively. Used to move position marker ~1.

On the left, in Figure 4, point B2 (α, 2
．． β82) from the starting point, operate the switch 62 to move the current position marker M to M', then operate the switch 64 to match the current position marker to 82, and move the current position P( α, β) coordinates a=a. ,
It can be set as β-β62.

Now, the location PH of the garage of the user who is wearing the driving display device of the present invention is at latitude β8. When the longitude can be expressed as α, use the switch 10 in advance to calculate α.

βi and point names such as “home,” “garage,” and “Yamamoto House” are input into the point memory 11.

In addition, as the switch 10, a keyboard, a touch panel, etc., a mask ROM, FR as the point memory 11, etc.
OM, RAM, magnetic tape, etc. can be used.

Now, as shown in FIG.
6, point key 17, correction switch 18, cancel key 20. It is composed of an input key 21.

A procedure for a user to register point information in the point memory 11 will be explained. First, when the user presses the point key 17, the point can be registered. A flowchart of this point registration process is shown in FIG.

Starting at step 120 in FIG. 7, when the user presses the location key 17, the display screen changes to something like FIG. 8 (al) and the location name is entered.

At this time, the name is input using the Japanese syllabary key 12. This process is shown in step 121 in FIG.

After inputting the name, press the input key 21, and the display screen will show the coordinates of the point as shown in Figure 8 (bl).

Coordinates are input using the numeric keys 13, and by pressing the enter key 21 after the desired number, latitude and longitude can be entered in that order. This process is shown in step 122 in FIG. After inputting the longitude, the display screen becomes as shown in Fig. 8 (cl). If you press the enter key 21 here, the point information is stored in the point memory 11, and the series of processing ends in step 123 of Fig. 7. do.

Next, the process of automatically correcting the cumulative division error will be explained using the flowcharts shown in FIGS. 9 to 12.

The symbols used in the explanation below each symbol in the figure are defined as follows.

β: Longitude of the current position calculated by the control circuit 5, β: Latitude of the current position calculated by the control circuit 5, T: Time the car continues to stop, E: Point P (α, β) and point PM ( α8.βH), L: Total distance traveled since the last correction, aH Longitude of the location of the two garages, βH Latitude of the location of the two garages, E, , : Determined distance, TK: fixed time, T8. : Set time, TK2: Set time, For example, now, for example, the car's ignition switch is turned off.
It is assumed that the process shown in FIG. 9 is executed every time the switch is turned ON. Step 100 hails the start step.

Further, step 101 represents all the steps for determining whether the time T during which the vehicle has been stopped is shorter than a predetermined time T.

Step 102 is the current position P (
a, β) and the garage position PH (α8.βH) is determined and represents the step of determining whether or not it is smaller than the distance ``H1''.

Step 106 calculates the current position Hp(a t
β) is corrected by the garage position P, (aM, βH). Step 111 is a step indicating the end of this routine.

That is, when the ignition of the car is turned on from OFF, the automatic correction process starts from start step 100, and in step 101 it is determined whether the car has been stopped for a sufficiently long time, and if the stopping time is short, the end step is started. The process proceeds to step 111; otherwise, the process proceeds to step 102. Then, in step 102, the current position P (a, β
) and the garage position is determined to be sufficiently small to E□, and if it is small, that is, P and P. is approaching, step 106 is executed, and the current position is corrected to the garage position by setting α-san and β-9. If E is not as small as E□, the process proceeds to end step 111.

For example, constants such as Ikm and 2km may be considered as EM, and EH2, but they may also be set as a function of the total distance traveled since the previous correction as shown in the following equation.

XL to EH, = 2XL to EH2= Also, as a condition for integrating the time T, a condition that the IG (ignition engine) is off may be added.

Figure 10 shows the conditions for correction: instead of the time T that the car has been stopped, the time (time period) that the car has been stopped
The processing using the following as the judgment criterion is shown below.

In the M2O diagram, starting at step 108, for example, if T31 is 1 a.m. and T12 is 4 a.m., then in step 107 it is determined whether the car was not moved between 1 a.m. and 4 a.m. It turns out.

10 and 11 show the processing when steps 101 and 107 are combined. In FIG. 10, if the car is moved between 1:00 a.m. and 4:00 a.m. in step 107, the process proceeds to step 102. If the car has not been moved, the process routine ends in step 111, and if the car has been moved, the process moves from step 107 to step 102. If E<EH2, the step ends in step 111. , E<EHl, in step 106 α←αi and β−βi are executed, and the process proceeds to step 111.

In addition, in FIG. 11, if it starts at step 109 and T<TK is not found in step 101, the step ends in step 111, and if T<TK, step 10
The processing routine that proceeds to step 111 via steps 7, 102, and 106 is the same as that shown in FIG.

Furthermore, in FIG. 12, the process starts at step 110, enters step 101, and determines that T < TK.
If T<TK, step 101 to step 107
, and the following processing routine is the same as the one shown in FIG. No. '10
It is similar to the figure.

As explained above, in this embodiment, the vehicle is
This system is designed to automatically correct cumulative errors by taking advantage of the fact that cars are often parked in parking lots.

〔Effect of the invention〕

As explained above, this invention determines whether the vehicle has returned to the location based on the distance between the location information registered in the location memory and the current location information and the parking time at the registered location, and calculates the cumulative error. Since the correction is made automatically, the current position is automatically reset without the user having to perform complicated error correction of the current position display, reducing the burden on the user and providing navigation display with good accuracy. is obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the overall configuration of an embodiment of the traveling information display device of the present invention, and FIG. 2 shows two orthogonal axes for explaining the operation of direction detection @3 in the traveling information display device. A diagram showing the direction detection state as the detection axis, Figure 3 (
al and Fig. 3 (bl is a diagram showing the state in which the current position of the vehicle is expressed in terms of greatness and longitude in the same traveling information display device, and Fig. 4 is for explaining the operation of the marker moving device in the same traveling information display device as above) , FIG. 5 is a circuit diagram showing the configuration of the marker moving device in the above running information display device, FIG. 6 is a diagram showing the configuration of the switch in the above running information display device, and FIG. 7 is a circuit diagram showing the configuration of the marker moving device in the above running information display device. Flowchart 1 showing the procedure for the user to register point information in the point memory, FIG. 8 ta) to FIG. Figures 9 to 12 showing the display contents of the display screen are flowcharts 1 and 2 showing processing routines when cumulative errors are automatically corrected by the traveling information display device. 1... Mileage detector, 2... Direction detector, 3...
Map memory, 4...Travel trajectory display device, 5.Control circuit, 6.Marker moving device, 10.Switch, 11
... Point memory, 17... Point key, 18... Correction switch. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] A mileage detector that generates a signal with a frequency proportional to the distance traveled by the vehicle, a direction detector that measures the direction of travel of the vehicle, a map memory that stores information such as roads on the map, and information on specific points. a point memory for storing the map information, a driving trajectory display device for displaying the map information, point information and the driving trajectory provided by the map memory and the point memory, and a driving trajectory display device for displaying the current position of the vehicle displayed on the driving trajectory display device. a marker moving device that moves a marker to an appropriate position; and a marker moving device that reads data from the map memory and point memory to display the map and point information on the travel trajectory display device, and displays the points registered in the point memory and the current location. A control circuit that automatically corrects cumulative errors in each information of the vehicle by determining whether the vehicle has returned to the location based on the distance to the location information and the parking time at the registered location. Information display device.