JP2000298030A - Navigation apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a navigation apparatus for guiding routes fit to emergency vehicles by changing a search condition for searching routes carried out by a route-searching means in accordance with the detection result whether it is an emergency running state or a normal running state. SOLUTION: A control part 1 specifies the present position of a vehicle based on map information from a CD-ROM player 5, a latitude and a longitude measured by a GPS receiving circuit 2, a run azimuth and a run distance measured by a direction sensor 3 and a vehicle velocity sensor 4. The control part having signals inputted from an operation part 7 and run state signals inputted from an emergency run notification control part 6 processes the signals. The control part sets a route search condition including a condition for emergency running in accordance with the signal from the emergency run notification control part 6 so that candidate routes are searched for with road data, for example, including a route wherein the vehicle runs a one-way road backward. When a condition for normal running is selected as the route search condition, candidate routes are searched for with road data from which the route whereby the vehicle runs a one-way road backward is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

TECHNICAL FIELD The present invention relates to a fire engine, an ambulance,
The present invention relates to a navigation device suitable for an emergency vehicle such as a police vehicle.

2. Description of the Related Art There is a navigation device as a device convenient for guiding a traveling route. This navigation device
Map database (CD-ROM, etc.) and positioning satellite GP
The recommended route from the own vehicle position to the destination set by the user based on the longitude and latitude measured by the S and the current position (own vehicle position) of the vehicle specified based on the traveling azimuth and distance. A search is performed, and a map or route is displayed on a liquid crystal display device or the like, or the position of the own vehicle that is simultaneously moving is displayed on a map in real time to guide the traveling route. Further, a method for the navigation device to search for a recommended route is established as a Dijkstra method using road data (for example, link information, node information, etc.) stored in a map database.

However, a conventional navigation device performs a route search in consideration of traffic rules such as prohibition of right and left turns and one-way traffic. That is, the guidance route is a route that complies with the traffic rules. On the other hand, an emergency vehicle is exempt from certain traffic rules during an emergency run. For this reason, when the navigation device is used for an emergency vehicle, a route that takes into account that the application of the traffic rules has been excluded is not searched during emergency driving, so that an appropriate route that can reach the destination in the shortest time is not necessarily required. It is not provided. The present invention solves such a problem, and an object of the present invention is to realize a navigation device that performs route guidance suitable for an emergency vehicle.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems. In a navigation device mounted on an emergency vehicle and providing route guidance, a setting device for setting a destination and a setting device for setting a destination. Route searching means for searching for a route to a destination, running state detecting means for detecting whether the vehicle is in an emergency running state or a normal running state, and the route searching means according to a detection result of the running state detecting means. And a condition changing means for changing a search condition of the route search performed by the user.

Next, a navigation device according to an embodiment of the present invention will be described. FIG. 1 is a configuration diagram showing a configuration of a navigation device according to an embodiment of the present invention. Reference numeral 2 denotes a GPS positioning device that measures the longitude and latitude of the current position of the vehicle based on radio waves received from GPS satellites. Reference numeral 3 denotes an azimuth sensor for measuring the traveling direction of the vehicle, which is constituted by a rotating gyro or the like. Reference numeral 4 denotes a vehicle speed sensor for detecting the speed of the vehicle, which is constituted by a magnet rotating with the axle, a wheel speed sensor for detecting the rotational speed of the wheel, and the like, which is composed of a reed switch connected and disconnected by the position of the magnet.
5 is a CD-R on which map information (road data, etc.) is recorded.
A CD-ROM player that reads map information from the OM 51 reads and outputs hierarchical data necessary for search and guidance, such as road data and location data of facilities, from the CD-ROM 51. 61 is an emergency light 62 (emergency running lamp) operated by the operator when the emergency vehicle shifts from normal running to emergency running.
When an emergency operation is designated by an operator's operation with a traveling state switch for turning on, etc., a signal indicating the emergency traveling is output to the emergency traveling information control unit 6. Reference numeral 62 denotes an emergency light (flashing red lamp) installed at an upper portion of the vehicle, for example, for notifying another vehicle traveling on the road of the emergency driving, and is turned on by a signal from the emergency driving notification control unit 6. 63 is
The siren notifies the other vehicles traveling on the road of the emergency traveling by an acoustic signal, and generates a siren sound according to a signal from the emergency traveling notification control unit 6. Reference numeral 6 denotes an emergency running notification control unit that controls the operation of the emergency light 62 and the siren 63 in accordance with the operation of the operator, and is configured by a microcomputer, a logic circuit, or the like. Reference numeral 7 denotes an operation unit for operating the navigation device, which includes a push switch, a joystick, and the like. Reference numeral 8 denotes an audio output circuit for outputting route guidance information and the like to the operator by voice, and is configured by a voice synthesis circuit. Reference numeral 81 denotes a speaker for converting an electric signal into an audio signal. Reference numeral 9 denotes a display for displaying guidance information such as a map, a route, and the position of the host vehicle, and is constituted by a liquid crystal display or the like. Reference numeral 1 denotes a control unit for controlling the navigation device, which is configured by a microcomputer including a CPU, a RAM, a ROM, and the like. Then, the control unit 1 transmits the map information from the CD-ROM player 5, the longitude and latitude measured by the GPS receiving circuit 2,
The present position (own vehicle position) of the vehicle is specified based on the traveling direction and traveling distance measured by the direction sensor 3 and the vehicle speed sensor 4, and a signal (a destination and an operation signal) from the operation unit 7 and an emergency traveling information control are provided. The operation of the navigation device is performed by inputting the driving state signals from the unit 6, performing processing in accordance with these signals, outputting signals to the sound output circuit 8 and the display 9, and performing desired display and notification. Control. In the process of searching for a recommended route, the detected current position, the operation unit 7
Based on the position of the destination input from the map and the road information (for example, link information, node information, etc.) read from the map database 5, a route to the destination is searched and processed by the Dijkstra method or the like, and the recommended route searched for Is displayed on the display 9 together with the map. When the crew of the emergency vehicle determines that the recommended route is appropriate and performs an operation to establish the route using the operation unit 7, the traveling route and the current position of the vehicle are displayed together with the map, and the traveling direction is reached when approaching a guide point such as an intersection. Is displayed, and the route guidance is executed. Next, a process performed by the control unit 1 regarding the operation of the navigation device will be described. FIG. 2 is a flowchart showing a process of the control unit 1 according to the embodiment of the present invention. This process is repeatedly performed together with other navigation-related processes while the navigation device is running. Step S1
Then, it is determined whether or not the vehicle is in an emergency traveling state. If the vehicle is in the emergency traveling state, the process proceeds to step S2.
Move to step S5. The emergency traveling state is determined by the state of the traveling state switch 61, that is, the emergency traveling information control unit 6
This is performed by a signal from In step S2, the route search condition is set so as to be searched under the condition for emergency driving, for example, the condition excluding traffic rules such as one-way traffic and right-turn prohibition, that is, a route that reverses one-way traffic. Is set so that a route search is performed using the road data included in the candidate route, and the process proceeds to step S3. Conversely, in step S5, a route search condition is searched under a condition for normal traveling, for example, a condition in which traffic rules such as one-way traffic are also considered, that is, a route that reverses one-way traffic is set as a candidate route. Step S3 is set so that a route search is performed using the excluded road data.
Move on to In step S3, based on the own vehicle position, destination, and road data, a recommended route is searched for under the set search condition, that is, the condition for emergency driving or the condition for normal driving, and the process proceeds to step S4. In step S4, the recommended route is displayed on the display 9, and the process ends. After that, regardless of the search condition, guidance based on the searched recommended route is performed in the same manner as in a normal navigation device. By performing the above-described processing, when the vehicle travels in an emergency, the recommended route is calculated by excluding, from the calculation conditions for the route search in the navigation device, the driving restriction conditions such as right / left prohibition and U-turn prohibition. In other words, according to this processing, when an emergency vehicle such as a fire-fighting or rescue emergency vehicle travels in an emergency, the restrictions during normal driving (stop at red light, prohibition of right and left turns, regulation of one-way traffic, prohibition of traffic outside the roadway) Guidance is performed on the recommended route under the condition excluding the application of the rules such as the above). Therefore, guidance is provided on a traveling route that is not subject to unnecessary traffic regulation, and it is possible for emergency vehicles to arrive at the destination. Next, regarding a specific guidance example, FIG.
This will be described with reference to FIG. FIG. 3 is an explanatory diagram illustrating a route guidance state in the navigation device according to the embodiment of the present invention. The figure shows an example in which a travel route from the vehicle position J to the destination D is searched for and guided. The traveling route from the vehicle position J to the destination D is the route Y (intersection P1
To the intersection P4, the route passing through the intersection P5), or the route Z (the route passing from the intersection P1 to the intersection P2, the intersection P5), and furthermore, the route X (the route from the intersection P1 to the intersection P).
2, a route passing through an intersection P3 and an intersection P5). During normal driving, the route search conditions
Since traffic rules such as one-way traffic are taken into consideration, a route search is performed on a road excluding the intersection P4 prohibiting right-turning and the road R going backward from the one-way traffic H3. As a result, the recommended road becomes the route X, and this route X is displayed on the display 9. Conversely, during an emergency run, the route search does not take into account traffic rules such as one-way traffic and no right turn, so all routes are considered (the road width etc. are considered as search conditions according to different setting conditions). A search is performed. Therefore, here, the route Y or the route Z (a route that cannot be normally passed due to traffic rules), which is the shortest distance to the destination, is displayed on the display 9 as a recommended route. As described above, according to the above-described embodiment of the present invention, when the emergency vehicle shifts from the normal traveling to the emergency traveling, a route suitable for the traffic rules of the emergency vehicle is searched, and the route suitable for the emergency traveling is searched. As a result, route guidance is performed, so that it is possible to quickly arrive at the destination.

As described above in detail, according to the present invention, the route guidance is performed on the recommended route according to the traveling state of the emergency vehicle, so that the emergency vehicle can quickly reach the destination where the emergency has occurred. Can arrive.

[Brief description of the drawings]

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

FIG. 2 is a flowchart illustrating a process performed by a control unit 1;

FIG. 3 is an explanatory diagram illustrating a route guidance state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Control part 2 ... GPS receiving circuit 3 ... Azimuth sensor 4 ... Vehicle speed sensor 5 ... CD-ROM player 6 ... Emergency run information control part 7 ... Operation part 9. ··display

Claims (1)

[Claims] 1. A navigation device mounted on an emergency vehicle for performing route guidance, comprising: setting means for setting a destination; route searching means for searching for a route to the destination set by the setting means; Or a normal running state, and a condition changing unit that changes a search condition of a route search performed by the route searching unit according to a detection result of the running state detecting unit. A navigation device characterized by the above-mentioned.