JPH03293518A - Navigation apparatus to be mounted on vehicle - Google Patents

Abstract

PURPOSE:To detect that a vehicle is moved in the state of stopping by providing a running distance detecting means, a direction detecting means, and a detecting means for detecting the change of the direction detected by the direction detecting means for not smaller than a predetermined time when running of the vehicle is not detected by the running distance detecting means. CONSTITUTION:To a controller 20 is input information related to the current position obtained by a running direction detecting sensor 10, a running distance detecting sensor 11, and a vehicle direction detecting sensor 12. A map information stored in a memory 3 is read out based on the information in the controller 20, and displayed at 4. Moreover, the controller 20 is so constituted as to activate a timer 21 when the change of the direction of the vehicle is detected by the sensor 12 while running of the vehicle is not detected by the sensor 11. If this state continues for a time not smaller than a predetermined time measured by the timer 21, it is judged that the vehicle is moved without running, namely, it is moved on a ferryboat or the like, and a detecting signal indicating the fact is output.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to an on-vehicle navigation device.

<Prior art> Conventionally, self-contained in-vehicle navigation devices detect the driving direction and distance of the car using sensors attached to the vehicle, and compare the information with map information stored on a CD-ROM or the like. It is configured to determine the location of your own army and display a map of your army's position and its surrounding area.

<Problem to be solved by the invention> However, with conventional devices, it is possible to display the correct position while the vehicle is moving on its own, but when the vehicle is moved by a car train or ferry boat, etc. In some cases, information on the distance traveled during this time cannot be obtained. Therefore 1
When the next time the vehicle starts driving with its own blade, the actual position of the vehicle and the information obtained by the sensor no longer match, making navigation completely meaningless. There was also the problem that if the user did not notice that such a situation had occurred and continued navigation, it would cause unnecessary danger and confusion.

Means for Solving the Problems> The present invention has been made to solve the above-mentioned problems, and includes a traveling distance detecting means for detecting the traveling distance of a vehicle, and an azimuth detecting means for detecting the direction of the vehicle.

The present invention is characterized by comprising means for detecting a change in the azimuth for a predetermined time period or more by the azimuth detection means in a state where the running of the vehicle is not detected by the travel distance detection means.

<Function> Even though the traveling distance detected by the traveling distance detecting means is 0, if the change in the direction detected by the direction detecting means continues for a predetermined time or more, this is detected by the detecting means. . This detection result indicates that the vehicle is not running autonomously, so based on this detection result, appropriate measures such as notifying the driver or stopping navigation operations are taken. be able to.

<Embodiment> An embodiment of the in-vehicle navigation device according to the present invention will be described below with reference to the drawings.

Fig. 1 is a block diagram of the in-vehicle navigation device. It is composed of a device 4 and an operation switch 5.

The position detection unit 1 includes a running direction detection sensor 10 for detecting the running direction of the vehicle, a running distance detection sensor 11 for detecting the running distance, and a vehicle direction detection sensor 12 for detecting the heading of the vehicle. It consists of

The travel distance detection sensor 11 is configured to electrically or mechanically detect the rotation of the wheels and the like when the vehicle moves, and detect the travel distance based on the number of rotations, the radius of the tires, etc. Due to its principle, the mileage detection sensor 11 cannot detect the distance traveled when the vehicle moves without the tires rotating.

The vehicle direction detection sensor 12 is composed of a gyro sensor, and the running direction detection sensor 10 is composed of a geomagnetic sensor.

The control unit 2 has a controller 20 and a timer 21, and the timer 21 is configured to start operating in response to a command from the controller 20 and measure a predetermined time. In this embodiment, this predetermined time is set so that movement by a car ferry or the like can be distinguished from rotation of a turntable in a parking lot or the like or shaking of the road while the vehicle is stopped.

In other words, a time period is set that is sufficient to determine whether the vehicle is moving without running, or whether only its direction has changed by some means.

The controller 20 is made up of an electrical circuit and software built into it. The controller 20 receives information about the current position from the traveling direction detection sensor 10, the traveling distance detection sensor 11, and the vehicle direction detection sensor 12, and reads the map information stored in the memory 3 based on the information. It is configured to display on the Dashi 1 display 4.

Further, each part is configured to perform a predetermined operation based on a command input from the operation switch 5.

The controller 20 is further configured to operate a timer 21 when a change in the orientation of the vehicle is detected by the vehicle direction detection sensor 12 while no travel is detected by the travel distance detection sensor 11. If this state continues for a predetermined period of time measured by the timer 21, it is determined that the vehicle is moving without running, that is, that the vehicle is moving by car ferry, car train, etc., and a notification is sent to that effect. It is configured to output a detection signal. In this embodiment, the navigation operation is stopped based on the detection, and a warning is displayed on the display 4 to notify the driver.

Next, the operation will be explained.

FIG. 2 shows a flowchart showing the operation of the controller 20.

After starting navigation (step 70), the controller 20
are a running direction detection sensor 10 and a running distance detection sensor 11
Based on the information about the current position detected and input by the vehicle direction detection sensor 12, the map information is called from the memory 3 and displayed on the display 4 (step 71).
). At this time, the controller 20 always controls the mileage detection sensor 11.
The value of the mileage inputted by is confirmed (step 72), and if the value of the mileage changes, that is, while it indicates that the vehicle is traveling, the process returns to step 71 and changes the display contents of the display 4. Refresh to view the status of the move. However, if the traveling distance does not change, that is, if the vehicle is stopped, then information about the vehicle direction measured by the vehicle direction detection sensor 12 is detected (step 73
), the controller 20 determines this azimuth information in step 74.
), if the direction of the vehicle has not changed, the process returns to step 71 and the normal navigation operation is repeated. However, if the direction of the vehicle is changing, the timer 21
is activated, and it is determined whether the change in orientation continues for a predetermined time or more (step 75). If the fluctuation ends within the predetermined time, the process returns to step 71 and continues displaying the current location as usual (step 75); if the change continues for more than the predetermined time, the vehicle stops moving. It is determined that the vehicle is moving and outputs the detection signal. Then, based on this detection signal, the navigation operation is stopped, and a warning is issued to the driver to inform him that the navigation is not being performed effectively (step 76), and the navigation operation is ended (step 77).

In the above-described embodiment, when the traveling distance detecting means 11 detects that the in-vehicle navigation device is in a stopped state, the variation in the direction of the vehicle detected by the vehicle direction detecting means 12 continues for a predetermined period of time or more. It is possible to judge whether or not it has continued. Therefore, based on the result, it can be determined whether or not the vehicle is traveling in a stopped state, that is, traveling by car ferry, car train, or the like. Furthermore, based on the judgment result, the navigation device itself judges the effectiveness of the navigation operation, and if it is judged to be invalid, it stops the navigation and warns the driver, which prevents accidents from occurring. can be prevented.

<Effects of the Invention> As explained above, the in-vehicle navigation device of the present invention includes a traveling distance detecting means for detecting the traveling distance of the vehicle, a direction detecting means for detecting the direction of the vehicle, and a vehicle navigation device using the traveling distance detecting means. and a means for detecting a change in direction for a predetermined time period or more by the direction detection means in a state where the vehicle is not detected to be traveling, so that it is possible to detect that the vehicle has moved while the vehicle has stopped running. The effect that can be obtained is obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. FIG. 2 is a flowchart showing the operation. 1: Position-side ratio section, 2: Control section, 3: Memory, 4: Display, 5: Operation switch, 10: Running direction detection sensor, 11
: Travel distance detection sensor, 12: Vehicle direction detection sensor, 2
0: Controller, 21: Timer.

Claims (1)

[Claims] a traveling distance detecting means for detecting the traveling distance of the vehicle; a bearing detecting means for detecting the direction of the vehicle; and a bearing for a predetermined time or more by the bearing detecting means in a state where the traveling of the vehicle is not detected by the traveling distance detecting means. An in-vehicle navigation device characterized by comprising: means for detecting a change in.