JPH06194181A - Navigation device - Google Patents

Abstract

PURPOSE:To judge whether the target time required to travel from a departure point to a destination is adequate or not, obtain the required average speed in consideration of the type of the road, and travel in the target time. CONSTITUTION:The target time required to travel from a departure point to a destination is inputted via an action key 6. If the required average speed based on the target time is larger than the average speed in the travel at a prescribed speed, a main microcomputer 5 generates an alarm on an LCD display device 8. If the required average speed is smaller, the difference between the target time and the required travel time is distributed to the required time for the road of each type to reduce the required average speed, and it is displayed for guidance on the LCD display device 8 for a travel in the target time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a navigation device for guiding a passage route from a starting point such as an automobile to a destination point.

[0002]

2. Description of the Related Art In a typical prior art navigation device mounted on an automobile or the like, which displays the current position of the vehicle and is used by a driver to determine a travel route,
The main function is route search, which gives the driver information on the shortest route from the starting point to the destination. Therefore, in order to know the time of arrival at the destination and the average speed required for the vehicle to travel to the destination, the driver himself / herself must make an estimate from the distance traveled to the destination displayed as a result of the route search. I have to. In this case, the required average speed is often approximated without distinguishing the types of roads such as narrow roads and wide toll roads, so if you want to strictly adhere to the arrival time at the destination, Even on narrow roads, there is a high risk of accidents caused by forgetting to slow down the vehicle.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to judge whether or not a target time input as a time required for traveling from a starting point to a destination is appropriate and raise awareness of danger and to increase road awareness. It is an object of the present invention to provide a navigation device that can improve safety by enabling a vehicle to travel at a target time by obtaining a required average speed in consideration of type.

[0004]

According to the present invention, in a navigation device for searching and guiding a set route between a starting point and a destination, a target time required for traveling from the starting point to the destination is set. A time input means for inputting the time, a calculation means for calculating a required travel time required to travel the searched route at a predetermined speed, and a target time in response to an output from the time input means and the calculation means. A navigation device comprising: a control unit for issuing an alarm when the travel time is shorter than the required travel time.

Further, according to the present invention, when the target time is longer than the required traveling time, the control means sets the speed traveling on the searched route corresponding to the difference between the required traveling time and the target time to the predetermined speed. It is characterized in that it guides the user to travel at a target time from the starting point to the destination.

[0006]

According to the present invention, the navigation device includes time input means, arithmetic means and control means. The time required for traveling from the departure place to the destination is input to the time input means as the target time. The calculation means calculates the required travel time required to travel at a predetermined speed determined in advance for the searched route in consideration of the road type. The control means issues an alarm when the target time is shorter than the required travel time in response to the outputs from the time input means and the calculation means. The warning increases the driver's awareness of the danger, and can recklessly review the schedule to improve the safety.

Further, according to the present invention, when the target time is longer than the required travel time, the control means responds to the difference between the required travel time and the target time by controlling the speed of traveling on the searched route. The speed is reduced below the predetermined speed. Display guidance is provided so that the vehicle travels from the starting point to the destination in a target time at a speed determined by lowering the speed from a predetermined speed in consideration of the road type. Therefore, the driver can devote the time margin to the further improvement of safety.

[0008]

1 is a block diagram showing the electrical construction of a navigation device according to an embodiment of the present invention. In order to display a map, road data showing the road shape including information on road types such as toll roads, main roads, and general roads, the distance of each road, the speed limit on each road, and a predetermined standard to be used when traveling Information data such as speed is recorded in a CD-ROM disc 1 which is a storage medium in a storage device of a vehicle. FIG. 2 shows data recorded in the CD-ROM disc 1. Road data indicating a road shape, a road distance, and the like is recorded in the digital map data 11.
The road type information 12 records the types of roads such as toll roads, main roads, and general roads. The predetermined speed that should be used as a guide when traveling for each road type is recorded in the predetermined speed information 13. On the other hand, the detection result detected by using the geomagnetic sensor or the wheel speed sensor is sent to a location microcomputer (not shown) (hereinafter referred to as "microcomputer"), and the vehicle position from the start point is obtained by dead reckoning. . The vehicle position obtained by dead-reckoning, and the CD from the CD-ROM disc 1 using the decoder 2
-Road data read by the ROM microcomputer 3 is transmitted to the main microcomputer 5 via the communication bus 4. In the main microcomputer 5, the vehicle position is compared with the road data, and the vehicle position is corrected by map matching. On the other hand, an operation key 6 is connected to the main microcomputer 5, and a setting operation for inputting a starting point, a destination, and a target time required for traveling from the starting point to the destination to the main microcomputer 5 is performed by the operation key 6 Done by After the input setting operation of the departure point and the destination is performed, the main microcomputer 5 searches for the travel route. The route determined by the main microcomputer 5 is a liquid crystal display device (abbreviated as “LCD”) via the drive circuit 7 together with a predetermined speed of each road.
It is displayed on a display device such as 8.

Further, the operation keys 6 are used to input and set the target time required for traveling from the departure place to the destination, that is, the departure time and the arrival time. In the main microcomputer 5, the required average speed required for traveling is calculated based on the traveling distance from the starting point to the destination and the target time. On the other hand, the average speed when traveling at a predetermined speed determined for each road type is obtained, and the two are compared. If the required average speed based on the target time is higher than the average speed when traveling at a predetermined speed, it is judged to be dangerous and L is set via the drive circuit 7.
A warning is issued to the CD display device 8. If the required average speed based on the target time is smaller than the average speed when traveling at the predetermined speed, it corresponds to the difference between the target time and the required traveling time when traveling at the predetermined speed for each road type. Allocate to the required time and reduce the required average speed below the predetermined speed. In this way, the LCD display device 8 is guided to travel from the starting point to the destination at the target time.

FIG. 3 is a flow chart for explaining the operation of the embodiment shown in FIG. 1, and FIG. 4 shows a display example of the route determined by the route search. In step n1, a route search is performed by the main microcomputer 5 based on the starting point and destination set by the operation keys 6. In step n2, use the operation key 6 to
The departure time and arrival time are input to the main microcomputer 5. For example, departure time is 9:00 am and arrival time is 1 am
Set at 0:30. At step n3, a required average speed required for traveling of the vehicle is obtained. The required average speed when set to the above time is, for example, 100 k for the total mileage.
When m, 100 km / 1.5 hours = 67 km / h
Becomes In step n4, the road type of the travel route obtained as a result of the route search is checked. Figure 4 along with road types
The illustrated route is displayed on the LCD display device 8. In the example shown in FIG. 4, the total distance traveled from the starting point to the destination is 1
It is 00 km, and a predetermined speed to be traveled for each road type is displayed. On the other hand, the time required for traveling on this route at a predetermined speed for each road type is expressed by equation (1).

10km / (30km / h) + 40km / (80km / h) + 30km / (60km / h) + 20km / (40km / h) = 1 hour 50 minutes (1) Therefore, the vehicle travels the entire traveling distance at a predetermined speed. When doing, the average speed is 100 km / 1 hour and 50 minutes = 55 km / h. In step n5, the target time and the required travel time for traveling at a predetermined speed are compared. That is, the required average speed based on the target time is compared with the predetermined speed. In the case of this embodiment, the required average speed of 67 km / h is
Since the average speed when traveling at a predetermined speed is higher than 55 km / h, it is determined in step n5 that the target time is shorter than the required traveling time, and in step n6 a warning as shown in FIG. It is displayed on the display device 8.
As another method of giving a warning, the driver may be notified by voice.

Next, when the arrival time is set to 11:00 am, the required average speed is 100 km / 2 hours = 50 km / h.
Becomes Therefore, since it is smaller than the average speed of 55 km / h when traveling at the above-mentioned predetermined speed, step n
In 5, it is determined that the target time is longer than the required travel time. When the target time and the required travel time are equal, that is,
When the required average speed matches the predetermined speed, the predetermined speed for each road type becomes the required average speed. When the target time is larger than the required travel time, that is, when the required average speed is smaller than the predetermined speed, in step n7, the required average speed for each road type corresponding to the difference between the required travel time and the target time. Is required. As one embodiment of the present invention, with an emphasis on slower traveling on a road having a longer mileage, the difference between the required traveling time and the target time is assigned to the required time for each road type by the ratio of the mileage for each road type. . This is because it is considered that the driver is more tired and the danger lasts as the mileage increases. In the present embodiment, the difference between the required traveling time of 1 hour and 50 minutes and the target time of 2 hours, which is obtained from the equation (1), is 2 hours-1 hour 50 minutes = 10 minutes. The mileage ratio for each road type is 1: 4: 3: 2 from FIG. When these 10 minutes are distributed at the ratio of the traveled distance, the time distribution and the required average speed for each road type become the values shown in Table 1.

[0013]

[Table 1]

FIG. 5 (b) shows a road map displaying the required average speed when the time is distributed on the LCD display device at the ratio of the traveled distance of each road type.

FIG. 5C shows a display example of the vehicle position after the start of traveling from the starting point and the required average speed of the road currently traveling.

As another embodiment of the present invention, the slower the road is, the more important it is to drive slowly, and the difference between the required travel time and the target time is calculated for each road type at the ratio of the predetermined speed for each road type. Allocate to the required time. This is because a road traveling at a higher speed is more dangerous to the driver. The ratio of the predetermined speeds for each road type is 3: 8: 6: 4 from FIG.
Difference 10 between required travel time and target time according to the above-described embodiment
When the minutes are distributed at a predetermined speed ratio, the time distribution and the required average speed for each road type become the values shown in Table 2.

[0017]

[Table 2]

As still another embodiment of the present invention, the slower the road is, the slower the road is emphasized, and the difference between the required travel time and the target time is determined by the ratio of the reciprocal of the predetermined speed of each road. Allocate to the required time for each type. It emphasizes the danger on roads that must be driven at low speeds, such as narrow roads. The ratio of the reciprocal of the predetermined speed for each road type is 8: 3: 4: 6. When the difference of 10 minutes between the required travel time and the target time is distributed by the ratio of the reciprocal of the predetermined speed as in the above-described embodiment, the time distribution and the required average speed for each road type become the values shown in Table 3.

[0019]

[Table 3]

Based on the required average speed thus obtained, the driver can travel and reach the destination safely at the target time.

[0021]

As described above, according to the present invention, it is possible to judge whether or not the target time input as the time required to travel from the starting point to the destination is valid, and when the target time is not valid. By raising an alarm, it is possible to raise awareness of danger and improve safety. If the target time is appropriate, the time margin is directed to improve safety, and the average speed required for traveling for each road type obtained corresponding to the target time is displayed. Since the time when the vehicle arrives at the destination can be grasped, the driver can have a sense of security when traveling and can easily make other plans.

[Brief description of drawings]

FIG. 1 is a block diagram showing an electrical configuration of a navigation device according to an embodiment of the present invention.

FIG. 2 is data recorded in the CD-ROM disc 1 shown in FIG.

FIG. 3 is a flowchart for explaining the operation of the embodiment shown in FIG.

FIG. 4 is a route determined by a route search.

FIG. 5 is a display example using the LCD display device 8 according to an embodiment of the present invention.

[Explanation of symbols]

 1 CD-ROM disc 2 Decoder 3 CD-ROM microcomputer 4 Communication bus 5 Main microcomputer 6 Operation keys 7 Drive circuit 8 LCD display device 11 Digital map data 12 Road type information 13 Predetermined speed information for each road type

Claims (2)

[Claims] 1. A navigation device for searching and guiding a set route between a starting point and a destination, and a time inputting means for inputting a target time required for traveling from the starting point to the destination as a target time. When the target time is shorter than the required travel time in response to the output from the time input means and the operation means for calculating the required travel time required to travel the searched route at a predetermined speed, A navigation device comprising: a control unit for generating an alarm. 2. The control means, when the target time is longer than the required travel time, reduces the speed of traveling on the searched route below the predetermined speed in accordance with the difference between the required travel time and the target time. The navigation device according to claim 1, wherein the navigation device guides the user to travel at a target time from a departure place to a destination.