JPH04172215A - Running guide apparatus for vehicle - Google Patents

Abstract

PURPOSE:To warn the driver beforehand by outputting guiding data before a constant distance or a constant time based on the data from measuring means and a timer housed in a control means. CONSTITUTION:When a vehicle approaches an intersection, right advance is indicated, and the distance to the intersection is displayed on a display device 5. In a control device 3, the coordinates of intersections or maps are stored. When the vehicle runs at a vehicle speed (v) at a distance l from the intersection, the control device 3 counts the pulses from a vehicle speed sensor 2, obtains the vehicle speed (v) and obtains an arriving time t=l/v. At the time when (t) becomes a constant time T0, the advancing bearing and the map data are compared, and the next advancing direction is displayed on a display device 4, and the distance to the intersection is displayed on the display device 5. The advancing path can be guided for the driver at the adequate position before the intersection in accordance with the speed by this processing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a travel guide device for a vehicle such as an in-vehicle navigation device.

[Conventional technology]

Hitherto, various types of car load navigation devices have been proposed, such as those disclosed in Japanese Patent Laid-Open No. 55-165000 and Japanese Patent Laid-open No. 56-121200. The former displays a road map stored in a storage device on a display device,
Based on the signal from the mileage sensor mounted on the vehicle, the road map displayed on the road map is sequentially erased by the amount of distance traveled, and the driver is informed of the current location and guided. The latter displays a road map and current driving position on the display screen, as well as instructions to turn right, turn left, and go straight to reach the destination.

[Problem to be solved by the invention]

As mentioned above, conventional in-vehicle navigation devices only show the current location on a road map, and the driver needs to determine the route to the destination by looking at the road map, or at an intersection. Even if the instruction is to turn right, turn left, or go straight, the instruction is not issued until the vehicle reaches the intersection, and the timing of issuing instructions is important as information for the driver of a car whose speed sometimes changes. However, there were issues such as the fact that the system was too slow, which not only caused anxiety for drivers, but also caused a traffic accident.

Also, a device that has a function that constantly displays the distance to the next intersection will show information about intersections that are far away.
There was also the problem that when a moving vehicle approached the intersection, the driver's consciousness diminished and there was a high possibility that he would forget to turn and get lost.

This invention was made in order to solve the above-mentioned problem, and it instructs the driver in the direction of travel to the next intersection, and the instruction is placed at an appropriate position before the intersection, that is, after the driver receives the instruction. To obtain a travel guide device for a vehicle capable of issuing a traveling direction instruction at a position that is sufficient and has a minimum time and distance margin before actually turning at an intersection.

Means for Solving CHB] A vehicle travel guide device according to the present invention includes a storage means for storing a road shape, a measurement means for measuring the position of a vehicle, and a road shape stored in the storage means and the measurement method. A vehicle travel guide device comprising: a control means for calculating vehicle guidance information based on the vehicle position information stored by the means; and a display means for displaying the vehicle guidance information from the control means; The guidance information is displayed in advance at a certain distance or a certain period of time in accordance with information obtained from a timer built into the control means.

[For production]

In this invention, the current position of the vehicle and the distance to the intersection are calculated before the intersection, the vehicle speed at that time is calculated, and route guidance is displayed at an appropriate position before the intersection according to the vehicle speed. , can provide appropriate information and attention to the driver.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure shows a block diagram of the vehicle travel guide device according to the present invention. In the figure, 1 is a direction sensor that measures the traveling direction of a vehicle equipped with the travel guide device of the present invention, and 2 is a direction sensor that measures the direction in which the vehicle travels a certain distance. 3 is a control device that performs various calculations for navigation; 4 is a first display device that informs the driver of the next direction of travel; 5 is a distance display device; This is a second display device that displays on a 7-segment display.

Next, the operation of the apparatus shown in FIG. 1 will be conceptually explained.

Now, assume that a vehicle is driving in the direction of the arrow in Figure 2 and is to be guided to turn right at the next intersection.

When the vehicle approaches the intersection shown in Figure 2, the control device 3
displays the traveling direction of the next intersection, that is, "right", and also displays the distance from the current point to the intersection on the second display device 5, guiding the vehicle in the destination direction. At this time, the control device 3
In order to know the next direction of travel and the distance to the intersection,
For example, it is necessary to take measures such as storing map data or road intersection coordinates in the control device IFs, but since this has no direct relation to the gist of the present invention, the details will be omitted.

Now, when a vehicle is traveling toward the intersection at a vehicle speed V at a distance 11J away from the intersection, the control device 3 measures the number of pulses of the vehicle speed sensor 2 that occur within a certain period of time, and calculates the vehicle speed V at that time. obtain. Further, the control device 3 obtains the distance l between the intersection and the current position from the internally stored map data and the current position obtained from the vehicle speed sensor 2 and the direction sensor.Next, the control device 3 calculates the time t to reach the intersection. is estimated by the following formula: t=-...(11 ■ When the calculation result of formula 11 above becomes less than T0 for a certain period of time, the control device 3 calculates the current heading and map data obtained from the heading sensor. Compare and calculate the next direction of travel to the first
is displayed on the display device 4 of. In addition, the second display device 5 displays the distance to the intersection in a process of 0 or more, so that route guidance can be provided to the driver at an appropriate position before the intersection depending on the vehicle speed.

Further, by adding the processing described below, the practicality can be further improved.

That is, at point A in FIG. 2, the result of calculation using equation (1) becomes less than or equal to a certain time T, and after the next direction of travel is displayed on the display device 4, the vehicle approaches the intersection and reaches point B. The calculation result of equation (1) is t>T.

In this case, the next direction of travel display is continued to prevent the display from flickering.

Furthermore, if t<T does not hold until just before the intersection shown in FIG. 2, the next direction of travel display will be displayed just before the intersection, causing confusion for the driver. Therefore, a certain distance 1 from the intersection. When the vehicle approaches the position, the next direction of travel is displayed regardless of the above conditions.

It would be even more effective to use a warning using a chime, buzzer, or other sound to call the driver's attention at the same time as displaying the display using the above method.

Next, the operation according to the present invention will be explained based on the flowchart shown in FIG.

First, start from step 100, then step 101
The current vehicle position obtained from the direction sensor 1 and vehicle speed sensor 2 and the distance l to the next intersection are calculated. In step 102, the distance l calculated in step 101 is 1<1.
If the result is YES, the distance from the intersection is less than 10, so proceed to step 107 where the next direction of travel is displayed; if the result is NO, step 10
Proceed to step 3 and check whether the next display flag is 1. If the result is YES, it is determined that the next direction of travel has already been displayed, and the process proceeds to step 107. If the result is NO, the current vehicle speed V is measured by the vehicle speed sensor 2 in step 104, and the process proceeds to step 105. In order to estimate the elapsed time to the next intersection, t-17v is calculated from the distance l obtained in step 101 and the vehicle speed V measured in step 104.Next, in step 106, t is a constant time T, against t
>Check whether T+ is satisfied. The result is Y
If es, the process proceeds to step 107 to calculate the next direction of travel and display it on the first display device 4 in step 108. In step 109, a next display flag is set. On the other hand, if the result of step 106 is NO, the process proceeds to step 110, calculates the current traveling direction, displays it on the first display device 4 in step 111, and proceeds to step 112. The distance g11 to the next intersection is displayed on the second display device 5. Next, in step 113, it is checked whether the distance @l=0, and if it is 1kO, proceed to 100L, and if 1=Q, the intersection has been reached. Therefore, in step 114, the next display flag is cleared to prepare for processing for the next intersection. Thus, the program returns to 100L and the above operation is repeated again.

Note that steps 104 to 112 are processes for calculating the timing for displaying the route display according to the vehicle speed. This process determines whether to display a route display.

〔Effect of the invention〕

As explained above, according to the present invention, route guidance can be displayed to the driver at an appropriate location according to the vehicle speed with a simple configuration including a direction sensor, a vehicle speed sensor, a control device, and a display device. As a result, the travel guide device for a vehicle can be made inexpensive, and has improved safety and operability, making it a highly practical device.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a vehicle travel guide device according to an embodiment of the present invention, FIG. 2 is a road diagram for explaining guided travel of a vehicle, and FIG. 3 is a flowchart for explaining the present invention in detail. It is a diagram. In the figure, 1... direction sensor, 2... vehicle speed sensor, 3...
...Control device, 4...First display device, 5...Second
display device. Agent Masuo Oiwa Figure 1 Figure 2

Claims (1)

[Claims] A storage means for storing a road shape, a measurement means for measuring the position of a vehicle, and a control means for calculating vehicle guidance information based on the road shape stored in the storage means and the vehicle position information stored by the measurement means. and a display means for displaying the vehicle guidance information from the control means. A travel guide device for a vehicle, characterized in that the above-mentioned guidance information is displayed first in front.