JPS62142216A - Travel guide for vehicle - Google Patents

Abstract

PURPOSE:To recognize that a vehicle is deviated from a guidance path by outputting an alarm signal when the vehicle is deviated from the guidance path. CONSTITUTION:A storage means 12 stores necessary information including a map for travel guidance. Then, an electric wave from a satellite is received by a receiver of a position system (GPS) of a present place detection means 14 to detect the present position of the vehicle. A control means 16 receives the signal and controls the means 12 based on an operated result and performs the processing such as displaying stored information. Especially, the alarm signal is outputted when the vehicle is deviated from the guidance path on the way to guide the vehicle to a specific target place by the means 16. For instance, a prescribed distance area (d) with the intersection center (C) as a center is set and the coordinates when the vehicle enters and gets out of the area are stored and an angle formed by the intersection center (C) and the coordinates of the above-mentioned two places is calculated and compared with the angle in the correct path and the correctness or wrongness of the path is decided and if wrong, a warning is announced with a voice that 'I took the wrong road'.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vehicle travel guidance device, and in particular to an iJ dual-purpose travel guidance system that can notify the driver when the vehicle deviates from the guidance route. This relates to a guidance device.

(Prior Art) A vehicle travel guidance device is a device that displays the vehicle's travel trajectory and current position along with a road map of the area in which the vehicle is traveling on a display means such as a CRT, and guides the vehicle to the destination without error. An example of this is shown in, for example, Japanese Patent Laid-Open No. 58-70125.

This type of device has a current location detection means for detecting the current location of the vehicle.
As disclosed in the Q bulletin, there is a method for detecting the distance and direction of a vehicle from a reference point and determining the current position of the vehicle as a relative position from the reference point, or from a satellite. A total output system that receives the emitted radio waves and determines the vehicle's current position as an absolute position on the earth (longitude, latitude)! GPS satellite system (GPS) is also available.

(Problems to be Solved by the Invention) However, with the above-mentioned current location detection means, in the former case, errors in measuring travel distance and direction accumulate and the accuracy decreases, and in the latter case, the accuracy is reduced depending on the state of the electric current 1IiIIhη. Accuracy fluctuates.

For this reason, for example, if you are being guided to a certain destination and it is necessary to turn at an intersection on the map shown on the display means,
It may not be possible to reliably determine whether an approaching intersection is the same as the intersection on the map.

Therefore, there are cases in which the driver passes an intersection where he should have turned, or feels uneasy even though he has actually turned at the intersection correctly.

The present invention was made in view of the problems of the conventional vehicle travel guidance device, and its purpose is to prevent the vehicle from moving in a direction different from the guidance route.
To provide a travel guidance device for a vehicle that can give a warning and quickly correct the guidance route to a regular guidance route.

(Means for Solving the Problems) In order to achieve the above object, the vehicle travel guidance device according to the present invention includes a display means (a > for displaying information for vehicle travel guidance, and the information fF18). Memory means to memorize (
b), and current location detection means for detecting the current location of the vehicle (
C), a guide route setting means (d) for setting a guide route for guiding the vehicle to the destination, and a control means (e) for controlling each of these means; ) is a determination means (f) for determining whether the vehicle has deviated from the guidance route based on information from the current location detection means (C) and the njN guidance route setting means <d);
and warning means (g) for outputting a warning signal when the determination means (f) determines that the vehicle has deviated.

The warning signal can be issued by audible notification to the driver, by changing the shape or display color of a mark indicating the current position, or by changing the background color of the map.

(Function) In the vehicle travel guidance system of the present invention configured as described above, when the vehicle deviates from the guidance route, for example by going straight or turning right at an intersection where a left turn should be made, a warning signal to that effect is sent to the driver. As a result, the driver who recognizes the deviation can quickly return to the normal guidance route.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 2 to 5 show an embodiment of a vehicle travel guidance device according to the present invention.

As shown in FIG. 2, the travel guidance device shown in FIG. 2 includes display means 10, storage means 12, current location detection means 14. It is roughly composed of J5 and control means 16.

The display means 10 displays information for guiding the vehicle, such as a map of the area where the vehicle is currently traveling, a guidance target point set on the map, a route to guide the vehicle to the guidance target point, and the current location. Displays the current location etc. determined by the detection means 14
Generally, a monochrome or color CRT, liquid crystal display element, plasma display, electroluminescence, etc. are used, and the displayed information is controlled by the control means 16.

The storage means 12 stores information necessary for travel guidance, including at least a map, and uses, for example, a CD-ROM or a magnetic tape. In particular, a CD-ROM has a large storage capacity, is compact, and is easy to access. Since the time is short, it is suitable as a storage means to be installed in a vehicle, and the stored information may include not only maps but also vehicle start-up inspection procedures, tire replacement procedures, etc.

Information is retrieved from the storage means 12 by loading a recording medium such as a compact disk or tape into a reproducing device and controlling the reproducing device by the control means 16.

The current location detecting means 14 includes a positioning system (G
It is equipped with a receiver for PS), and a sensor that detects the current position using known geomagnetism.
You can also use it.

The principle of detecting the current position of a vehicle using GPS will be briefly explained below.

As schematically shown in Fig. 3, the GPS uses a plurality of antennas A, ~A4 distributed at appropriate intervals on the earth E.
It is composed of a plurality of satellites S, ~S4, and a user P, and each satellite S, ~S4 is controlled by a control station C via antennas A, ~A4. Also, 1 each! li F)-S
+~S4 has antenna A.

”-A Receiver that receives No. 13 from 4 and the user []
The user P is equipped with a transmitter (Δ device) that emits various kinds of information No. 111 toward the satellites, and a receiver that receives signals from the satellites S1 to S4.

Here, if there is a clock that is completely synchronized at the transmitting point and receiving point of radio waves, and the transmitted signal is controlled by the clock, then if the timing of reception at the receiving point is measured, the propagation of radio waves between the transmitting and receiving points can be measured. The time can be determined, and by multiplying it by the speed of light, the distance Ml between the transmitting and receiving points can be determined.

Now, there are three satellites S4 in the field of view (receivable area) of user P.
．． Sz.

SL, and each satellite S1. It is known that S2 and Sl transmit distance measuring stations using clocks that are synchronized with each other, and the positions of each of the satellites 81 to S3 at the time of reception cannot be accurately determined. If the reception point of these signals is measured between [1 and 'i], then each satellite S1. The distance between S2, Sl and the receiver (L point P is calculated, and the position of user P is determined by each satellite S5.S2
, S1 can be determined as the intersection of three spherical surfaces centered on S1.

This makes it possible to grasp the current position of a running vehicle as an absolute position on the earth.

On the other hand, the control means 16 is comprised of a so-called microcomputer in this embodiment, and the display means 10. Storage means 12. The input/output interface 16a connected to the current location detection means 14 receives signals from the current location detection means 14 via the input/output interface 16a according to procedures stored in read-only memory (ROM) 16b, and calculates the results. The CPU 16c activates the storage means 12 based on the information, and performs processing such as displaying the stored information, for example, the current location on a map.
and a random access memory (RAM) 16d for temporarily storing captured data.

In particular, in the present invention, the control means 16 is configured to output an alarm signal 114 when the vehicle deviates from the guidance route while guiding the vehicle to a set destination.
As a specific example, a case will be described in which the guidance route is set to turn left at an intersection as shown in FIG. 4.

In this embodiment, a predetermined distance area d centered on the intersection center C is set, and when a vehicle enters the area d, k +15
Then, ■ Store the coordinates when escaping from the rear d in the RAM 16d and write d3, calculate the angle formed by the coordinates of the intersection center C and the 2 points of Houki, and compare it with the angle on the correct route.
It will judge whether the route is correct or not, and if it is 1, it will warn you that you are on the wrong route in our city.

Figure 4 (A) shows the correct guidance route at intersection C, that is, a situation where Qi enters point [) within area d at a predetermined distance from intersection center C, turns left and exits at point Q in area d. It shows.

On the other hand, Figure 4 (13) shows the trajectory when a vehicle makes a right turn in the wrong direction at intersection C, where a vehicle enters at point P in area d and turns at point W in area d. Indicates a state of escape.

An entry or exit point P in these areas d5,
Since Q and W can be obtained from the input value of the guidance route, which has been added in advance by 6, and the output of the current location detection means 14,
Based on this, l PCQ (-θ0) and ZPcW (-〇,) that appear when the vehicle turns left or right can also be easily zeroed out.

70-dit- when the above procedure is performed by the control means 16
1- is shown in FIG.

When the warning routine of the present invention starts in step ■,
First, in step ■, the distance ff1D between the vehicle's current position and the intersection center C is calculated, and this is compared with the predetermined distance lllll11 rear d in step ■, and when they match or D is smaller than d, D's 1i [1 is step■
This value becomes the coordinates of the point P that entered the vehicle area d.

Next, in step 2, D and d are compared again, and the comparison is repeated until D becomes larger than d, and the value of D when D becomes larger than dJ is the value of D when the vehicle escapes from area d. These are the coordinates of the point W, that is, the point W, so the values are stored in step (2).

After that, in step ■, the correct path angle θ0 (ZPC
Q) and the angle θ at which the vehicle actually changed course, (/PC
After calculating W) with the CPU 16c, θ0 is calculated in step ■.
The absolute value of -61 is determined and compared with a predetermined value.

The predetermined value is θ0, which is the entry or exit point P to area d.
, can be obtained accurately from Q and the intersection center C, whereas
The point W at which the vehicle actually escapes from area d varies depending on the traffic conditions at the intersection, so this point is provided to correct this.

If 1θ0-θ,1 is larger than the predetermined WiK, the vehicle is off the guidance route, so step
After receiving a voice warning that you are on the wrong path, step [
] to return to the main routine.

On the other hand, if 1θ0-θ,j is smaller than the predetermined value, the vehicle is proceeding along the guidance route, so no warning signal is issued, and the process returns to the main routine at step [share], and the driver can be confirmed to be guided without error.

In addition, if the control means 16T outputs a warning signal other than an audio warning signal, the processing content in step (2) may be changed, for example, by changing the color of the dorsal circle of the map, which can be easily handled.

(Effects of the Invention) As described above in detail in the embodiments, the vehicle travel guidance device according to the present invention outputs a warning signal when the vehicle deviates from the guidance route. It has excellent effects such as being able to recognize when you have deviated from the guidance route and quickly correct it to the regular guidance route! :F is rejected.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of the device of the present invention, FIG. 2 is a block diagram showing the overall configuration of an embodiment of the device of the present invention, FIG. 3 is a schematic explanatory diagram of the DPS system, and FIG. 4 is the block diagram of the device of the present invention. FIG. 5 is an explanatory diagram showing one embodiment of the apparatus, and FIG. 5 is a flowchart showing the processing procedure of the control means. 10...Display means 12...Storage means 14...Current location detection means 16...Control means patent applicant Mazda Co., Ltd.
Representative of Pioneer Co., Ltd.
Patent Attorney - Shikken Hakuma
Patent Attorney Masatoshi Matsumoto Figure 1

Claims (1)

[Claims] (1) Display means for displaying information for guiding the vehicle, storage means for storing the information, current position detection means for detecting the current position of the vehicle, and means for guiding the vehicle to the destination. It includes a guidance route setting means for setting a guidance route, and a control means for controlling each of these means, and the control means is configured to prevent the vehicle from leaving the guidance route based on information from the current position detection means and the guidance route setting means. A travel guidance system for a vehicle, comprising a determining means for determining whether or not the vehicle has deviated from the vehicle, and a warning means for outputting a warning signal when the determining means determines that the vehicle has deviated from the vehicle.