JP2005276112A - Navigation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a navigation device for automatically updating a set speed in auto cruising by a radar system. <P>SOLUTION: This navigation device comprises a position detecting device for detecting a traveling position of an automobile 1, a map information storing device for storing the map information, a section specifying device for specifying a section of a road where the automobile 1 travels, from the position detecting device and the map information storing device, a receiving device for receiving the traveling position and the safety speed information 2 at a traveling destination side from the external, and a speed control device for controlling a speed of the automobile 1 by the safety speed information 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a navigation device for effectively utilizing an in-vehicle radar system, and navigation capable of automatically updating a set speed of an in-vehicle radar system when there is no preceding vehicle ahead to a safe speed according to time and place. It relates to the device.

  In recent years, the development of highways has led to the production of cars with an auto-cruise function that keeps the speed of the cars constant. This function frees the driver from subtle accelerator operations, and also prevents overspeed resulting from paralysis of the sense of human speed, helping to reduce the driver's burden and ensure safety. Auto cruise that keeps such a constant speed works well when the road is empty, but the highway is congested like in urban areas and the flow of cars is below the speed limit. If you are, you will soon get close to the preceding car and you will have to cancel the function.

In order to solve this problem, a radar system that measures the distance and relative speed with the preceding vehicle is installed in the automobile, and when the vehicle approaches the preceding vehicle, auto-cruise that keeps the distance from the preceding vehicle constant has started to be provided. In this system, when the preceding vehicle is far away, it will run at the preset speed, and when it approaches the preceding vehicle, it will automatically decelerate and secure a certain inter-vehicle distance, so there is no need to cancel the function, The driver's burden can be reduced even on a relatively congested road.
JP 7-182598 A

  However, because the safe speed of the road changes depending on the section, weather conditions, traffic conditions such as accidents, construction, etc., it is necessary to change the set speed frequently while driving even if auto cruise using a radar system is activated. Arise. Changing the setting while driving has a problem that, depending on the changing method, there is a risk that the attention to driving is distracted and an accident may occur.

  Accordingly, it is an object of the present invention to provide a navigation device for automatically changing a set speed in auto cruise by a radar system.

  The navigation device according to the present invention includes a position detection device that detects a travel position of a vehicle, a map information storage device that stores map information, and the vehicle that travels from the position detection device and the map information storage device. A section identifying device for identifying a road section having a predetermined safe speed, a receiving device for receiving the traveling position and the safe speed information on the destination side from the outside, and controlling the speed of the vehicle based on the safe speed information And a speed control device.

  In the navigation device of the present invention, preferably, the receiver is capable of receiving a signal having a communication frequency used in a mobile phone system.

  In the navigation device of the present invention, preferably, the receiver is capable of receiving a signal having a communication frequency used in a radio.

  In the navigation device of the present invention, preferably, the receiver is capable of receiving a signal having a communication frequency transmitted from a radio wave sign installed on a road.

  In the navigation device of the present invention, preferably, the speed control device changes the speed before the section where the safe speed changes, before the section.

  In the navigation device of the present invention, preferably, the speed control device changes the speed of the automobile at an acceleration of 0.3 G or less.

  A navigation device according to the present invention includes a position detection device that detects a travel position of a vehicle, a map information storage device that stores map information, and a predetermined vehicle traveled from the position detection device and the map information storage device. A section specifying device for specifying a road section of a safe speed, a receiving device for receiving driving position and driving speed information on the destination side from the outside, and a speed control device for controlling the speed of the vehicle based on the safe speed information Therefore, it is possible to obtain the safe speed of the road that changes spatially or temporally as appropriate, and to automatically update the set speed of the speed control device to the safe speed according to the situation. Can contribute to the prevention of accidents.

  In the navigation device of the present invention, preferably, since the receiving device can receive a signal of a communication frequency used in the mobile phone system, it is more advantageous to use radio waves from mobile phone antennas installed in various places. Safe speed information can be received easily and accurately.

  In the navigation device of the present invention, preferably, since the receiving device can receive a signal having a communication frequency used in a radio, it is easier and more accurate by using radio waves from radio antennas installed in various places. The safe speed information can be received well.

  In the navigation device of the present invention, preferably, since the receiving device can receive a signal of a communication frequency transmitted from a radio sign installed on a road, it is closer than a radio sign installed on each road section. In addition, since only necessary information can be received, more reliable and efficient reception is possible, and more accurate speed control is possible.

  In the navigation apparatus of the present invention, preferably, the speed control device changes the speed before the section where the safe speed changes, so that the speed changes to the safe speed at the boundary of the section where the safe speed changes. Therefore, the speed change for the vehicle can be moderated, and the acceleration generated in the passenger can be further reduced.

  In the navigation device of the present invention, preferably, the speed control device changes the speed of the automobile with an acceleration of 0.3 G or less, so that the acceleration generated in the passenger is further reduced to reduce the burden on the passenger. In addition, it is possible to suppress deterioration in fuel consumption efficiency due to sudden acceleration and rear-end collision due to sudden deceleration.

  The navigation device of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic view for explaining an example of an auto cruise using the navigation device of the present invention.

  In FIG. 1, (a) is an auto-cruise situation when the automobile 1 is traveling in the section A, (b) is an auto-cruise situation when the automobile 1 is traveling in the section B, and (c) is an automobile 1. Is an auto-cruise situation when the situation changes, for example, when it starts to rain, while traveling in the section B.

In FIG. 1A, the automobile 1 is traveling in a section A with a safe speed of 100 km / h. The section A is a section B with a safe speed of 80 km / h with a large curve, and the section B is again a section C with a safe speed of 100 km / h with a small curve. The navigation device mounted on the automobile 1 at this time stores the following safe speed information 2 received from the outside by the receiving device.
Section A: Safe speed 100 km / h
Section B: Safe speed 80km / h
Section C: Safe speed 100 km / h

  The car 1 determines that the navigation device is traveling in the section A and the safe speed in the section A is 100 km / h, and the speed is automatically controlled at the auto-cruise setting speed of 100 km / h. ing.

  In FIG. 1 (b), the automobile 1 determines that the safe speed is 80 km / h by receiving the latest safe speed information 2 while traveling in the section B by the navigation device, and performs auto cruise. The speed is automatically controlled at a set speed of 80 km / h.

Furthermore, in FIG.1 (c), it begins to rain during the driving | running | working of the motor vehicle 1 at 80 km / h in the area B which was initially safe speed 80 km / h, and the safe speed of each area is updated as follows.
Section A: Safe speed 80km / h
Section B: Safe speed 60km / h
Section C: Safe speed 80km / h

  Here, the automobile 1 receives the updated safe speed information 3 from the outside by the navigation device, and automatically sets the auto cruise speed from 80 km / h to 60 km / h using the latest safe speed information 3. Updated and controlled.

  As described above, the navigation device of the present invention can appropriately acquire the safe speed of the road that changes spatially or temporally, and can automatically update the set speed of the speed control device to the safe speed according to the situation. Therefore, the burden on the driver can be reduced and the accident can be prevented.

  FIG. 2 is a schematic diagram for explaining an example of a receiving device used in the navigation device of the present invention.

  In FIG. 2, (a) is the case of the navigation device of the present invention in which the receiving device can receive signals of the communication frequency used in the mobile phone system 4, and (b) is used in the radio system 5 by the receiving device. This is a case of the navigation device of the present invention that can receive a signal of a communication frequency that is received, and (c) is a book that enables the receiver to receive a signal of a communication frequency that is transmitted from a radio wave marker 6 installed on a road. This is the case of the navigation device of the invention.

  In FIG. 1 (a), the receiving device acquires the current position and the safe speed information of the road ahead using a signal of a communication frequency used in the mobile phone system 4. At this time, it is necessary to provide a separate transmitter so that the current position of the automobile 1 and the road information of the destination are transmitted to the mobile phone system 4 and only the safe speed information necessary for the automobile 1 is acquired in a short time. It is desirable because information can be acquired.

  Further, in FIG. 2B, the receiving device acquires the safe speed information of the current position and the road ahead using a signal of a communication frequency used in the radio system 5 such as a highway radio. In this case, the radio receivable section is limited, and only the information necessary for the car in that section is broadcast. Therefore, it is necessary to provide a separate transmitter and transmit the current position of the car 1 and the road information of the destination. Absent.

  Further, in FIG. 2C, the receiving device acquires the safe speed information of the current position and the road destination using the signal of the communication frequency transmitted from the radio wave marker 6 installed on the road. In this case, the section in which the signal from the radio wave marker 6 can be received is limited, and only necessary information is transmitted to the car 1 in that section. Therefore, a separate transmitter is provided, and the current position of the car 1 and the road on which it travels There is no need to send information.

  In the navigation apparatus of the present invention, it is preferable that the speed control device is configured to change the speed before the section where the safe speed changes. Thereby, the speed change for making it safe speed in the boundary of the area where safe speed changes can be made loose, and the acceleration which arises to a passenger can be reduced more.

In the navigation device of the present invention, preferably, the speed control device changes the speed of the vehicle at an acceleration of 0.3 G or less (G is a gravitational acceleration, G = 9.8 m / s ² ) or less. It is good to let you. Thereby, it is possible to further reduce the acceleration generated in the passenger, reduce the burden on the passenger, and contribute to the prevention of accidents.

  When the acceleration accompanying the speed change of the speed control device exceeds 0.3 G, the acceleration is felt uncomfortable for the passenger, and it is difficult to reduce the burden on the passenger.

  More preferably, the speed control device may change the speed of the automobile so that the acceleration during acceleration is 0.3 G or less and the acceleration applied during deceleration is 0.2 G or less. As a result, since the passenger is stably fixed by being pressed against the seat during acceleration, a relatively small load is not applied even at an acceleration of 0.3 G or less, but the passenger is placed on the seat for acceleration applied during deceleration. Since it becomes difficult to fix, it is better to reduce the load by lowering the acceleration.

  The speed control device is preferably a system using a radar, and in addition to the received safe speed information, the distance from the preceding vehicle when approaching the receiving preceding vehicle is kept constant so that it is safer. It is possible to run.

  It should be noted that the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the present invention.

It is the schematic for demonstrating the various examples of the auto-cruise using the navigation apparatus of this invention, (a) is the auto-cruise situation when the motor vehicle is driving the section A, (b) is the motor vehicle being the section B. (C) is an auto-cruise situation when the situation changes while the vehicle is traveling in the section B. It is the schematic for demonstrating the other example of the auto cruise using the navigation apparatus of this invention, (a) is the case where the signal of the communication frequency used in a mobile telephone system is receivable by the receiver ( b) When the receiving device can receive a signal of a communication frequency used in the radio system, (c) can receive a signal of a communication frequency transmitted from a radio wave sign installed on the road. Is the case.

Explanation of symbols

1: Car 2, 3: Safe speed information 3: Receiver 4: Mobile phone system 5: Radio system 6: Radio wave indicator

Claims (6)

A road at a predetermined safe speed on which the vehicle is traveling from a position detection device that detects a traveling position of the vehicle, a map information storage device that stores map information, and the position detection device and the map information storage device A section identifying device that identifies the section of the vehicle, a receiving device for receiving the travel position and the safe speed information on the travel destination side from the outside, and a speed control device that controls the speed of the vehicle based on the safe speed information. A navigation device characterized by that. The navigation apparatus according to claim 1, wherein the receiver is capable of receiving a signal having a communication frequency used in a mobile phone system. The navigation apparatus according to claim 1, wherein the receiver is capable of receiving a signal having a communication frequency used in a radio. The navigation apparatus according to claim 1, wherein the receiver is capable of receiving a signal having a communication frequency transmitted from a radio sign installed on a road. The navigation device according to any one of claims 1 to 4, wherein the speed control device changes the speed before the section when the safe speed changes. The navigation device according to any one of claims 1 to 5, wherein the speed control device changes the speed of the automobile at an acceleration of 0.3 G or less.

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