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car navigation system
Inactive Publication Date: 2014-10-08
DENSO CORP
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Abstract
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Problems solved by technology
However, it takes a certain amount of time to obtain guidance information (data communication time) when the amount of information is large, and the driving environment on the vehicle side is also different depending on various driving conditions, so it may not be possible to install equipment on the road. location get guide information
In addition, although the guidance information is reported in the information provision area, since the position of the information provision area is fixed, there may be cases where the notification cannot be made at an appropriate timing due to the difference in the guidance information.
For example, there may be a problem that the reporting timing of intersection guidance information may be too early or too late depending on the speed of the vehicle
Method used
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no. 1 approach
[0028] Below, refer to Figure 1 ~ Figure 3 , to describe the first embodiment.
[0029] figure 1 The configuration of the car navigation system 1 according to the present embodiment is schematically shown. This car navigation system 1 includes an information center 3 and a navigation device 2 mounted on a vehicle.
[0030] The above-mentioned navigation device 2 is configured to include a control device 4 that controls the whole with a computer (CPU) as the main structure, and is equipped with a communication device 5 connected to the control device 4 for performing wireless communication with the outside, a detection The position detection part 6 of self-vehicle position, the display 7 that for example is constituted by full-color liquid crystal display as the guide notifying part, the operation switch group 8 that comprises touch panel, mechanical switch, the sound output device 9 as the guiding notifying part, and map database 10 etc. The above-mentioned control device...
no. 2 approach
[0060] Next, a second embodiment will be described. Figure 4A , Figure 4B It is a flowchart according to the second embodiment in which the navigation device 2 adjusts the position of the guidance notification start point Ph according to the vehicle speed. That is, in step T2 , a guidance information request command not including vehicle speed information is sent to the information center 3 . In this way, the information center 3 does not adjust the guidance notification start point, and transmits the guidance notification start point and guidance information stored by default to the navigation device 2 in step S3.
[0061] Moreover, in the navigation device 2, when the information reception from the information center 3 is completed (step T4), then in the step Ta, according to the vehicle speed information of the own vehicle and the complexity of the guidance target point Pt, the same method as that of the first embodiment is adopted. In this way, the guidance reporting s...
no. 3 approach
[0063] Figure 5 A third embodiment of the present invention is shown.
[0064] The navigation device 2 adjusts the position of the communication start point Pk stored in the map database 10 based on the vehicle speed of the own vehicle. In this case, before the own vehicle arrives at the communication start point Pk, the position of the communication start point Pk is adjusted so that if the vehicle speed is fast, the position of the communication start point Pk is shifted toward the current position P of the own vehicle; The position of the communication start point Pk is shifted in the direction of the guidance target point Pt. According to this embodiment, communication can be started according to the traveling speed. For example, when the driving speed is fast, the communication start timing is advanced, so communication failure can be avoided, and in traffic jams, the communication start timing is delayed, so the latest guidance information can be obtained.
[0065] I...
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Abstract
The invention discloses a vehicle-mounted navigation system (1), which comprises an information center (3) and a navigation device (2) acquiring guide information from the information center (3) through wireless communication. The navigation device (2) sends guide information requiring instructions having speed information to the information center (3) from a timing when a vehicle passes through the communication starting location. The information center (3) when having acquired inquiry information from the navigation device (2) adjusts a guide apprising start location position according to the speed information and sends the adjusted guide apprising start location position information and the guide information to the navigation device (2). If the navigation device receives the guide apprising start location position information and the guide information from the information center (3), the navigation device informs guide information from a timing of the received guide apprising start location when the vehicle passes through the location position.
Description
technical field [0001] The present invention relates to a car navigation system including a navigation device capable of wireless communication with an information center. Background technique [0002] Conventionally, the following technology is known to communicate with on-road equipment installed on the road, receive guidance information such as traffic information, and report (including display and voice notification) the received guidance information in the information providing area (for example, patent document 1). [0003] In the technique described in Patent Document 1, guidance information is received at installation locations of on-road equipment, and guidance information is reported in an information providing area set to a predetermined radius from the center coordinates. [0004] Patent Document 1: JP-2008-158887A (US 2008 / 0150707A) [0005] However, in the prior art described above, the vehicle communicates with the on-road equipment to obtain guidance inform...
Claims
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Application Information
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