JPH0666080B2 - Car navigation system - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vehicle-mounted navigation device.

BACKGROUND ART Recently, a so-called on-vehicle navigation device has been proposed in which a screen display such as a CRT or a liquid crystal display is installed in a vehicle compartment to display a map screen useful for vehicle operation.

It is desirable for such an in-vehicle navigation device not only to display the designated map screen via the keyboard but also to display the image in such a way as to anticipate the needs of the passenger from the viewpoint of reducing the input operation of the passenger. .

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle-mounted navigation device that displays useful image information for an occupant when a predetermined time from a reference time (including a time based on the south central time of the sun is included).

In the vehicle-mounted navigation device according to the present invention, the schedule information stored in advance is displayed when the elapse of the predetermined time is detected by the timer (including the clock) that measures the elapse of the predetermined time.

Example Hereinafter, an example of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an in-vehicle navigation device for carrying out the method according to the present invention, in which the display 1 comprises a two-dimensional screen display such as a CRT, a liquid crystal display, etc., for example, in front of a passenger in a vehicle compartment. It is provided in or near the instrument panel provided in. The display 1 is controlled by a display control circuit 2 including, for example, a character generator to display a screen such as a road map. The current position measuring device 3 is, for example, a GPS (Glo
bal Positioning System) and the like, and supplies position data (address) such as longitude and latitude corresponding to the current position of the vehicle to the central processing circuit 4 including, for example, a microprocessor. Further, the input device 5 is composed of, for example, a so-called keyboard, and the passenger inputs the scheduled time or the time when the scheduled time has passed and inputs the restaurant position information or the schedule table and the schedule information such as a memorandum to be displayed at the time or the time It is an input means to perform. Information input through the input device 5 is written in the memory circuit 6 by the central processing circuit 4. The storage circuit 6 is composed of, for example, a solid-state memory such as a so-called RAM, and acts as a storage unit that stores a program that defines an operation procedure of the central processing circuit 4 and data to be processed by the central processing circuit 4. The storage medium player 7 comprises, for example, a so-called CD player, and acts as a storage means for storing a large amount of data even if the response is not so good. A tape recording medium such as a so-called VTR may be used as this storage means. The vehicle speed sensor 8 supplies the vehicle speed data to the central processing circuit 4 every moment, and the central processing circuit 4 sequentially writes the data in the storage circuit 6.

The current position measuring device in the navigation device is not limited to GPS, and other systems may be used, or the current position may be manually input.

In such a navigation device, the central processing circuit 4 cooperates with the memory circuit 6 and the recording medium player 7 to display various images in response to a resistance command from the input device 5. Particularly in the present invention, the central processing circuit 6 executes the operation mode as shown in the flowchart of FIG. That is, in this operation mode, first, a scan command is given to the recording medium player 7 to collect index information pieces associated with the plurality of map screen information pieces recorded on the set recording medium (step S ₁ , S ₂ ). The index information pieces include the scale factor of the corresponding map screen information piece and the absolute address (for example, longitude and latitude) of the screen reference position. Then
By performing arithmetic processing on the contents of each index information piece, the upper surface absolute address [X _H (N), Y _H (N)] and lower limit address [X _H (N), Y _H (N)] on each X and Y axis for each map screen information piece _L (N), Y
_L (N)] is obtained and transferred as an upper and lower address pair to the memory circuit 6 for writing (step S ₃ ). Note that N is a natural number and is a number assigned to each map screen information piece. On the other hand, if the current position information obtained from the current position measuring device 3 is not an absolute address, to convert the this absolute address (step S _4). The present address number (X _P , Y _P ) thus obtained is already obtained from XL _L (N), X _H (N), Y _L (N), Y _H (N),
Comparing the door, detects the _{X L (N) <X H} (N) and _{Y L (N) <Y P} <N which satisfies the formula Y _H (N) (step S _5, S _6).

In this case, it is important that numbers are assigned to the map screen information pieces so that the smaller N is, the smaller the scale factor is, and the search operation is performed in order from the smaller scale factor until the above expression is satisfied. By doing so, the screen information having the smallest scale including the current location is displayed. That is, the central processing circuit 4 instructs the reading of the N-th map screen information pieces with respect to the recording medium player 7 (step S _7). Then
Upon detecting the predetermined time has passed or the scheduled time has elapsed from a reference time point (Step S _8), an average vehicle speed data obtained from the memory circuit 6 (Step S _9), the predetermined time period by multiplying the predetermined time on the average speed It calculates the distance that may travel within (step S _10). Then, the travelable distance is converted into a distance on the screen based on the read scale ratio of the map (step S ₁₁ ). Next, an arc image is formed with the converted distance as the radius and the current position as the center (step S ₁₂ ). Then, the schedule information regarding the passenger's future schedule, that is, the schedule, such as the restaurant position display image or the schedule table that has already been reserved, is read (step
S ₁₃ ). Image of restaurant position display image is selected N
Of course, it corresponds to the second map screen. When the schedule information is correlated with the map screen,
Forming a screen based on the data of the current position and reservation information (step S _14, S _15). In addition, as shown in the schedule table,
When the schedule information that is not related to the map screen, to display only the reservation information (step S _14, S _16).

EFFECTS OF THE INVENTION As is apparent from the above, in the vehicle-mounted navigation device according to the present invention, when the map information and the reservation information have a correlation when the reservation time preset by the operator or the lapse of a predetermined time is detected. Since the map information, the schedule information and the current position information of the vehicle are automatically displayed, the passenger can concentrate on driving, which is desirable from the viewpoint of safety.

[Brief description of drawings]

FIG. 1 is a block diagram showing an in-vehicle navigation device according to the present invention, FIG. 2 is a flow chart for explaining the operation of the device of FIG. 1, and FIG. 3 is a diagram showing an example of a display screen by the device of FIG. . Description of symbols of main parts 1 ... Display device, 2 ... Display control circuit 3 ... Current position measuring device, 4 ... Central control circuit 5 ... Input device, 6 ... Storage circuit 7 ... Recording medium player, 8: Vehicle speed sensor

Claims (1)

[Claims] 1. Display means for displaying a screen according to supplied information, a current position measuring device for measuring a current position of a vehicle and sending the current position information, and a storage means for storing map screen information. An input device for inputting schedule information and a schedule time, and schedule information storage means for storing the schedule information,
And a control means for relaying the map screen information and the schedule information obtained from the storage means and the schedule information storage means to the display means, and the control means, The map screen information including the current position where the vehicle is located and the schedule information including the current position where the vehicle is located when the timekeeping means detects a predetermined time and the schedule information including the current position where the vehicle is located has a correlation with the schedule information. An in-vehicle navigation device, which relays current position information to the display means.