JPS62293120A - Traveling information display device - Google Patents

Abstract

PURPOSE:To expand the application range of error correction and to improve the reliability and usability by providing a place point memory where the positions of parking lots etc. are registered, a correction switch that a user operates when making corrections, a control circuit, etc. CONSTITUTION:A traveling distance detector l generates a signal of frequency proportional to the traveling distance of a vehicle, and an azimuth detector 2 measures the traveling direction. A map memory 3 is stored with map information and a place point memory 11 is stored with specific place point information. A marker moving device 6, on the other hand, moves a marker which indicates the current position of the vehicle. Then a control circuit 5 reads data out of the memories 3 and ll to display a map and place point information on a display device 4 and also judges whether the vehicle returns to the registered place or not from the current position calculated by using the position coordinates of the place registered in the memory 3, the distance to the registered place, and the parking time, thereby automatically correcting the cumulative error. Further, if the judgement is hardly made, an inquiry about whether the user can make corrections or not is displayed on the display device 4 and, when the user operates the correction switch, the cumulative error is corrected.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] This invention uses the position coordinates of points such as parking lots and garages registered in advance in an in-vehicle navigation device. Then, it would be possible to automatically correct the cumulative error by determining whether the vehicle has returned to a parking lot, garage, etc. based on the calculated distance between the current location and the registered location and the parking time. The present invention relates to a driving information display device.

[Conventional technology]

Conventional in-vehicle navigation designs are disclosed, for example, in Japanese Patent Application Laid-Open No. 59-204081 and Japanese Patent Application Laid-Open No. 58-178214.
In the case of the latter, the system includes 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. Equipped with a display, the current position is recognized in spherical coordinates or orthogonal coordinates, and the current position is calculated according to the vehicle's travel.
I am trying to update and display it.

[Problem that the invention seeks to solve]

However, in the above-mentioned in-vehicle navigation device, there are measurement errors of the travel distance detector and direction detector, and calculation errors when calculating the current position, so these become cumulative errors as the vehicle travels and are not 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 the current position can be automatically reset without the user having to perform complicated corrections for errors in displaying the current position, thereby reducing the burden on the user. It is an object of the present invention to provide a driving information display device that can be corrected by a user himself/herself, expands the scope of application of error correction, and is expected to improve reliability and convenience.

[Means for solving problems]

The travel information display device according to the present invention uses a point memory for registering the location of a parking lot or garage, a correction switch operated by the user when correction is required, and position coordinates of the registered point. A sub-means is provided for correcting the cumulative error automatically or when operating a correction switch based on the distance between the current position and the registered position and the parking time.

[For production]

In this invention, the current position is automatically calculated using the position coordinates of points such as parking lots and garages registered in the point memory, and the distance between the calculated current position and the registered position and the parking time are calculated. It is determined whether the vehicle has returned to a parking lot, garage, etc., and the cumulative error is corrected. If it is difficult for the control means to automatically judge, the user is asked whether or not correction is possible, and the user corrects the error. Accumulate with one touch by pressing the switch! Correct the I error.

〔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), reference numeral 1 denotes a travel distance detector that generates a signal with a frequency proportional to the travel speed as the vehicle (not shown) travels.

Further, the direction detector 2 is for measuring the traveling direction of the vehicle, and the map memory 3 stores information such as roads on the map.

These travel distance detector 1, direction detector 2, map, and memory 3 are each connected to a control circuit 5. Also connected to this control circuit 5 are a marker moving device 6, a switch 10, a travel trajectory display device 4 (hereinafter referred to as a display device), and a point memory 11, respectively.

The marker moving device 6 is for moving a marker (hereinafter abbreviated as a current position marker) representing the current position of the vehicle displayed on the display 4 to an appropriate position.

Further, the switch 10 controls the control circuit 5 to control the control mode; ζfi! This is a switch for giving instructions.

Furthermore, the display device 4 includes a map memory 3 and a point memory 1.
This is for displaying the map information, point information, and travel trajectory given in 1.

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 word 4, and also corrects the current position. This is a control circuit for making and executing decisions.

Further, as the direction detector 2, a method of measuring the direction of earth's magnetism, a direction 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, an insect detector having two orthogonal detection axes is used, and as shown in FIG. 2, one of the two detection axes is aligned with the traveling direction of the vehicle 7, and the other detection axis is The direction detector 2 is set at an arbitrary position on the vehicle 7 so that the direction detector 2 is placed in a horizontal plane perpendicular to the traveling direction of the vehicle.

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 earth's magnetism is H, the magnetic field components Hu and HV in the two detection axis directions of the direction detector 2 are Hu=1Haioθ.

H=KH fiber θ is given by

Here, K, K2 are constants determined by the structure of the vehicle, and 2 is approximately equal to K1. In the following explanation, for the sake of simplicity, it is assumed that K, = K2 = K', but this does not cause the -Jffl property to be lost.

Two electrical output signals Eu obtained from the direction detector 2,
EV is Eu=AHu=AK'HC1+60°EV=AK'
It is given by H fiber θ. Here, A is a constant related to the sensitivity of the direction detector 2.

In the above equation, if we replace AK'=, E = KH
(1) θ.

E = KH fiber θ becomes.

As shown in Figure 2, the coordinate axes X, Yj2Y axis are north.

Set the X axis to correspond to the east.

In the state shown in FIG. 2, the vehicle 7 is traveling a short distance gtd
If the amount of movement in the X direction and the Y direction is ΔX and Δy, respectively, ΔX and Δy are given by the following equations.

Δx=dcaoθ, Δy=domθ −−(1)(g)θ== EU/ v′E, ”+ E, , mθ=
Ev/ ,, /EU'+ Ev', and from equation (1), Δx = d-Eu/ 7E, J''+Ev', Δy = d
-E, /7E, 2+E,'...(2).

As shown in Figure 3 (a) and Figure 3 (bl), if the latitude of the current position is β, the longitude is α, and the radius of the earth is r, then ΔX,
Δy is the variation Δβ in latitude and longitude according to the following formula.

It can be converted into Δa.

Δβ=ily sub°・・・・・・・・・・・・・・・
- (4) r π According to this formula, the current position of the vehicle is calculated and updated using latitude and longitude. Therefore, the current position Q(α) after traveling from an arbitrary point P as a starting point.

β) is at point P, a=a,,β−β. After that, each time the vehicle moves a small distance d, the
It can be obtained by adding Δa and Δβ, and the travel trajectory is obtained by connecting the points given by (a, β) from point P to point Q.

As mentioned above, the mileage detector 1 generates a signal with a frequency proportional to the moving speed of the vehicle, but when this signal is converted into pulses, one pulse is generated every time the vehicle travels a certain distance 111d. will be done.

Therefore, if the control circuit 5 performs the process of adding ΔQ and Δβ to the aforementioned α and β, respectively, each time a pulse is obtained from the travel distance detector 1, the travel trajectory and current position can easily be calculated. It can be understood.

Next, the marker moving device will be explained. In FIG. 4, rQJ indicated by M is an example of the current position marker, and the center point of the circle represents the current position.

When the map data is read from the map memory 3 and the map is displayed on the display 4, the current position marker M appears at approximately the center of the screen of the display 4.

Before moving the vehicle 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 the screen of the display 4, respectively. It is used to move the position marker M.

For example, in Figure 4, point B2 ('81
7β82) as the starting point, operate the switch 62 to move the current position marker M by M', then operate the switch 64 to match the current position marker to 82. Position P(α.

β) coordinates as a = aa2. It can be set as β=β,2.

Now, the location P of the garage of the user who has installed the device of this invention is
H is latitude β8. When the longitude can be expressed by aH, use the switch 10 in advance to set α8. β8 and “home”
, "Garage", "Yamamoto House", etc. in point memory 1.
Enter 1.

In this case, the switch 10 is a keyboard, a touch panel, etc., and the point memory 11 and the
T,? ) ROM, FROM, RAM, magnetic tape, etc. can be used.

As one of the switches 10, a correction switch 18 is provided as shown in FIG. This figure 6 shows the switch 10
It shows the configuration of 12 50-sound kana keys and 1 numeric key.
3. The function keys 14 are comprised of a destination key 15, a current position key 16, a location key 17, a correction switch 18, a cancel key 20, and an input key 21.

If the current position P (cr, β) is set as a = aH, β - β by pressing the correction switch 18 now, the user will be able to set the current position P (cr, β) as a = aH, β - β when leaving the garage or returning to the garage. Press the correction switch 18 to t! Kede,
Discrepancies in current position display that occur as a result of cumulative sensor measurement errors and calculation errors can be easily corrected.

Further, at this time, if the fact that the correction has been performed and the corrected location and name are displayed on the screen (the screen of the display device 4), the user can easily identify even if an incorrect correction has been made.

Next, a process for automatically correcting the cumulative M error will be explained using the flowcharts shown in FIGS. 7 to 10. Each symbol in these figures and symbols used in the following explanation are defined as follows.

a: 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 has been stopped, E: Point P (α, β) and point PH ( α□, βS), L: Total distance traveled since the last correction, αH: Longitude of the location of the garage, βH: Latitude of the location of the garage, El, ll: Determined distance , EH2' determined distance (EH2>EHl), T:
Set time T1, l: Set time, TV, 2: Set time, Now, the car's ignition and cyan switch are turned off.
It is assumed that the process shown in FIG. 7 is executed every time the power is turned ON. Step 100 represents a start. Step 1
At step 01, it is determined whether the time T during which the car continues to stop is shorter than a predetermined time TH, and if it is not, the step ends at step 111, and the processing routine ends.

If it is determined in step 101 that T is T, the process proceeds to step 102. This step 102 determines whether the straight line distance rtE between the current position P (α, β) calculated by the control circuit 5 and the garage position JPH (aH, β□) is smaller than a predetermined distance "EH@". This is the step of determining.

If E<EH is not satisfied in this step 102, the process proceeds to step 111, the step ends, and E
If so, proceed to step 103.

This step 103 is similar to step 102, and E
This step is to determine whether E is smaller than E.
If E<EH2, proceed to step 111 and the step ends; if E<EH□, proceed to step 104.
Proceed to.

In step 104, a screen is displayed asking the user whether correction is possible or not, and the process proceeds to step 105.

This step 105 represents a step of determining whether the user has pressed the correction switch 18 on the screen display.

Step 106 is the calculation result of the current position P(α, β
) by the garage position p, (, , , 4M). When this correction is completed, the processing routine proceeds to step 111.

In other words, the car's Evenirasian switch changes from OFF to O.
If N, automatic correction processing is started from start step 100, and it is determined in step 101 whether the car has been stopped for a sufficiently long time, and if the stopping time is short, the process proceeds to end step 111. If not, proceed to step 102.

In step 102, it is determined whether the deviation E between the current position P (a, β) and the garage position is sufficiently small compared to EH8, and if it is small, that is, when P and 28 are close to each other, step 106 is executed. and a-α8. The current position is corrected to the garage position as β-β8.

If E is not smaller than EHl, proceed to step 103 and compare with a number E1.12, which is larger than E61. E is E
If it is not sufficiently smaller than o, no correction is made and the process proceeds to end step 111; otherwise, in step 104, the user is asked whether or not the correction is possible, and the decision is left to the user's decision.

In step 105, the user's judgment is determined, and in step 10
6, and also skipping step 106,
Proceed to end step 111.

Now, E,,11. For example, as EH□,
km.

A constant such as 2 km may be considered, but it may also be set as a function of the total distance traveled since the previous correction as shown in the following equation.

E, ,=, XL EH2=, XL Further, an example of the display of the inquiry to the user expressed in step 105 is shown in FIG. 11(a) and FIG. 11(bl).

In addition, a condition for T integration may be added that the switch is an ignition switch.

FIG. 8 shows a process in which the time (time period) during which the vehicle continues to be stopped is used as the criterion for correction, instead of the time T during which the vehicle continues to be stopped.

For example, if T,1 is 1 a.m. and TK2 is 4 a.m., then in step 107 it is determined whether the car has not been moved between 1 a.m. and 4 a.m.

The process shown in FIG. 8 is a case where step 107 of the process shown in FIG. 7 is replaced with step 101.

In addition, FIGS. 9 and 10 show step 101 in FIG.
FIG. 9 shows a case in which the same processing routine as in FIG. 7 is executed after performing the processing in step 107 when T3 is T3 in the processing in step 101. There is.

In the case of FIG. 10, step 101 is T (if T, then the same processing routine as in FIG. 7 is executed, and step 10
1 and if T<TK does not hold, the process proceeds to step 102 after performing the process of step 107, and thereafter the same processing routine as that shown in FIG. 7 is executed.

In addition, in the flowcharts of FIGS. 8 to 10, the start step is step 108°109.11.
Each is marked as 0.

As explained above, in this embodiment, the cumulative error can be automatically corrected by taking advantage of the fact that the vehicle is often parked in a specific garage or parking lot.

〔Effect of the invention〕

This invention (as explained above) recognizes that the vehicle has returned to a specific parking lot and automatically resets the current location, so the user does not have to perform complicated operations. You can reduce the burden of

In addition, when it is difficult to make a decision, we ask the user whether correction is possible or not, and we also use a correction switch so that the user can press the correction switch and make corrections with one touch.
The applicable range of error correction can be expanded.

Furthermore, since the user can perform correction using the correction switch whenever he or she desires, reliability and convenience are improved, and a comfortable navigation control display can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the traveling information display device of the present invention, and FIG. 2 shows two orthogonal axes as detection axes for explaining the operation of the direction detector in the same traveling information display device. Figures showing the direction detection state, Figures 3(a) and 3(b). A diagram for explaining the operation of the marker moving device in the information display device, FIG. 5 is a circuit diagram showing the configuration of the marker moving device in the above traveling information display device, and FIG. 6 is a diagram showing the configuration of the switch in the same traveling information display device. Figures 7 to 10 are flowcharts for automatic processing of cumulative error correction in the traveling information display device as described above, and Figures 11 (al and bl) are cumulative errors in the traveling information display device as described above. It is a figure which shows the example of the inquiry display to a user during a correction process. 1... Distance detector, 2... Direction detector, 3...
- Map memory, 4... Driving trajectory display device, 5... Control circuit, 6... Marker moving device, 10... Switch, 11... Point memory, 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 the indicated 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 also displays the map and point information on the traveling trajectory display device, and also moves the point registered in advance in the point memory. It calculates using the position coordinates and determines whether the vehicle has returned to the registered point based on the distance between the current position and the registered position and the parking time, and automatically corrects the cumulative error and corrects the judgment. A driving information display comprising: a control circuit that displays an inquiry to the user on the driving trajectory display device as to whether or not correction is possible in difficult situations; and a correction switch that allows the control circuit to correct cumulative errors when operated by the user. Device.