JPH0518773A - In-vehicle navigation device - Google Patents

Abstract

(57) [Summary] [Purpose] When an unexpected traffic jam occurs while traveling on the recommended route, it is possible to automatically and smoothly perform a re-search for the recommended route without the driver's operation. And [Structure] Beacon position information from a beacon transceiver, current position data from a GPS receiver, vehicle direction data from a direction sensor, vehicle speed and mileage from a vehicle speed pulse sensor, and map data storage unit are obtained through a system control unit. The current position of the vehicle calculated by the current position calculation unit based on the road map data and the departure point data set by the system control unit, the recommended position between the current position and the destination searched and extracted by the route search and extraction unit, and the system control unit Displays the road map read from the map data storage unit on the display unit through the display control unit, and judges the traffic congestion from the running state of the vehicle and the braking interval. [Effect] It is possible to drive safely and smoothly without requiring a driver's operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle-mounted navigation device which detects a current position of a vehicle and displays the current position, a destination and a route from the current position to the destination on a road map. is there.

[0002]

2. Description of the Related Art FIG. 7 shows, for example, JP-A-2-28800.
FIG. 7 is a system configuration diagram for implementing a recommended route search / display method in the conventional navigation device disclosed in Japanese Patent Publication No.

In FIG. 7, the processor 71 is a CPU.
77, ROM 78, RAM 79, and input / output interface 80 are connected by a bus 81.

The traffic information receiver 72 receives traffic information and the like from a traffic information processing center via a transmitter installed on a road information board or a signal pole.

In addition, a compact disc player 73
Reads out road map data and the like stored in the compact disc 7, and operates as a read-only external storage device.

The CRT display 74 is the processing device 7
Display is performed based on various data converted into a display signal by 1.

The operating section 75 is composed of an input device such as a key switch or a light pen.

The self-contained navigation type position sensor 76 is composed of a geomagnetic sensor, a vehicle speed sensor and the like.

Since the conventional navigation device for searching and displaying the recommended route is configured as described above, the first step of determining the candidate route between the current position and the destination and the predetermined limiting condition for the candidate route. Second to search the route within
Second, based on the stage, traffic information and route selection conditions
The third step of extracting the recommended route from the route searched in the step 1) is sequentially performed, and the recommended route is searched and extracted and displayed.

[0010]

Since the conventional navigation device for searching and displaying the recommended route is configured as described above, the recommended route once searched and displayed is immediately displayed in the traffic information while the recommended route is running. If the traffic is not reflected in the traffic information, or if there is an unexpected traffic jam in a place where traffic information cannot be obtained, the driver operates the car to instruct to search the recommended route again. Must be
It was sometimes inconvenient.

The invention of claim 1 has been made to solve the above problems, and automatically and smoothly without re-searching and extracting the recommended route while the recommended route is running without the driver's operation. An object is to obtain a vehicle-mounted navigation device that can be carried out.

It is an object of the present invention to provide a vehicle-mounted navigation device capable of easily detecting a traffic jam without using a complicated device or an advanced sensor.

It is an object of the invention of claim 3 to provide a vehicle-mounted navigation device capable of easily detecting a traffic jam without using a complicated device or an advanced sensor.

[0014]

According to a first aspect of the present invention, there is provided a vehicle-mounted navigation device, which is provided in a vehicle, detects a traveling state of the vehicle, determines a traffic state, and detects whether there is a traffic congestion. Means and route correcting means for correcting the recommended route based on the information from the traffic jam detecting means are provided.

According to another aspect of the present invention, there is provided a vehicle-mounted navigation device comprising traffic jam detecting means for detecting whether or not there is traffic jam by monitoring the duration of a state where the braking interval of the driver of the vehicle is a predetermined time or less. It is provided.

An on-vehicle navigation system according to a third aspect of the present invention is provided with a traffic jam detecting means for detecting the presence or absence of traffic jam by monitoring the duration of time when the speed of the vehicle is below a predetermined value. .

[0017]

According to the first aspect of the present invention, the traffic congestion detecting means causes the traffic information to not be immediately reflected on the recommended route, or the traffic information cannot be obtained.
When an unexpected traffic jam occurs, the traveling condition of the vehicle is detected to determine the traffic jam condition, and when the traffic jam is detected, the route correcting means automatically re-searches and extracts the route.

According to the invention of claim 2, the presence or absence of traffic congestion is detected by monitoring the duration of the state in which the braking interval of the driver of the vehicle is less than or equal to the predetermined time by the traffic congestion detection means, and the traffic congestion is detected. In this case, the route is automatically re-searched and extracted.

According to the third aspect of the present invention, the presence or absence of traffic congestion is detected by monitoring the duration of time when the speed of the vehicle is below a predetermined value by the traffic congestion detection means. The path is re-searched and extracted.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a vehicle-mounted navigation device of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the system configuration of the embodiment.

In the figure, 1 is a beacon transceiver, 2 is a map data storage unit, 3 is a GPS receiver, 4 is a direction sensor, 5 is a vehicle speed pulse sensor, 6 is a brake sensor, 7 is a route search / extraction unit, and 8 is Current position calculator, 9 is system controller, 1
Reference numeral 0 denotes a display control unit, which controls the display on the display unit 12 based on a command from the system control unit 9. An operation unit 11 is input to the system control unit 9.

The beacon transmitter / receiver 1 is a two-way communication beacon installed on a road information board, a pillar of a traffic signal, or the like from a traffic information processing center (not shown) for traffic information, travel route information, etc. requested by the vehicle. In addition, the position information of the place where the two-way communication beacon is installed is also received.

The map data storage unit 2 stores road map data to be displayed on the display unit 12, road map data for searching a recommended route, road map data for calculating the current position, and the like.

The GPS (Global Positioning System) receiver 3 receives radio waves from GPS artificial satellites and obtains current position data.

The azimuth sensor 4 is, for example, a geomagnetic sensor that can obtain an absolute azimuth or an optical gyro that can obtain a relative azimuth, and detects the traveling azimuth of the vehicle.

The vehicle speed pulse sensor 5 detects a pulse having a repetition frequency corresponding to the vehicle speed.

The brake sensor 6 is for detecting whether or not the driver has stepped on the brake.

The route search / extraction unit 7 reads the road map data from the map data storage unit 2 according to the current position of the vehicle, the destination, the route search / extraction conditions and the like obtained from the system control unit 9, and searches for a travelable route. , The recommended route is extracted.

The current position calculating section 8 counts the current position data from the GPS receiver 3, the traveling direction data from the direction sensor 4, the pulse from the vehicle speed pulse sensor 5 and the traveling distance data, and the system control. The beacon position data received by the beacon transceiver 1 obtained via the unit 9 is compared with the departure point data and the traveling locus, and the current position is calculated using the road map data for error correction as the route correction means. To do.

The system control unit 9 includes the beacon transceiver 1
The traffic information requested by the vehicle, the travel route information, and the location information of the place where the two-way communication beacon is installed are also obtained via the vehicle to detect the presence or absence of traffic congestion, and from the operation unit 11. Control signal according to each control signal, the road map data for the road map to be displayed on the display unit 12 is read from the map data storage unit 2, and the current position for searching and extracting the recommended route is displayed. , The destination and search extraction conditions are set in the route search extraction unit 7, the recommended route is read from the route detection extraction unit 7, the beacon position data 9 and the departure point data are set in the current position calculation unit 8, and the current position coordinates are calculated. The display control unit 10 is controlled so that the speed of the vehicle is read from the current position calculation unit 8 and the road map, the current position mark, the destination mark, the recommended route, etc. are displayed on the display unit 12. The signal from the brake sensor 6, is intended to read the presence or absence of braking the driver.

The display control unit 10 generates a display signal according to an instruction from the system control unit 9 and displays it on the display unit 12.

The display section 12 displays an image according to the display signal from the display control section 10.

The operation unit 11 is composed of an input device such as a key switch, a light pen, an infrared touch switch, etc., and generates a control signal to the system control unit 9.

Next, the processing procedure of the present invention configured as described above will be described with reference to the flowcharts of FIGS. 2 to 4 and FIGS. 5 and 6 showing the screen displayed on the display unit 12.

First, in the flow chart of FIG. 2, in step 21, the current position calculation unit 8 counts the current position data from the GPS receiver 3, the traveling direction data from the direction sensor 4, and the pulses from the vehicle speed pulse sensor 5. By comparing the vehicle speed and mileage data obtained as a result, the beacon position data received by the beacon transceiver 1 obtained via the system control unit 9 with the departure point data, and the traveling locus, road map data for correcting the error is obtained. It is used to calculate and detect the current position.

In the next step 22, the system controller 9 reads the road map data from the map data memory 2 according to the current position detected in step 21, and the road map and the current map are displayed on the display 12 via the display controller 10. If the position and route are being guided, the destination and the recommended route are displayed.

In the next step 23, it is determined whether or not the navigation device is currently guiding the route. If it is determined that the route is being guided, the process proceeds to step 24. If the route is not being guided, the process proceeds to step 25. move on.

In step 24, it is judged whether or not the traffic is congested by checking the result of the judgment processing during the traffic (whether there is a traffic jam flag), and the result of this judgment processing is YES.
If so, the process proceeds to step 28, and if NO, the process proceeds to step 25.

A concrete method of the judgment processing during congestion will be described later with reference to FIGS. 3 and 4.

In step 25, it is determined whether or not route guidance is to be performed. As a result of the determination, if the route is being guided, it is determined whether or not the destination is changed or the route search / extraction condition is changed. If the determination result is YES, the process proceeds to step 26, and if NO, Return to step 21 again.

At step 26, a destination for guiding the route is set.

In the next step 27, the route search / extraction unit 7
Reads road map data from the map data storage unit 2 in accordance with the current position of the vehicle and the destination, searches a travelable route, and sets route search and extraction conditions for extracting a recommended route.

The route search / extraction conditions include, for example, traffic information (accident information, traffic jam information,
Search including regulatory information). It is possible to search by the shortest time or the shortest distance, and it is also possible to combine them or to prioritize them.

In the next step 28, the route search / extraction unit 7 performs the route search / extraction process according to the route search / extraction conditions set in step 27.

In the next step 29, the system controller 9 reads the recommended route searched and extracted in step 28 from the route search / extractor 7, and displays it together with the road map, the current position and the destination through the display controller 10. Display on 12. Then, the process returns to step 21 again, and the same processing is repeated thereafter.

Next, the judgment process during traffic jam will be described with reference to FIG.
Description will be given along the flowchart of FIG.

First, the processing procedure for judging the traffic congestion from the vehicle speed will be described with reference to the flowchart of FIG.
The process shown in FIG. 3 is, for example, a timer interrupt process that is activated every fixed time (for example, 5 seconds).

When the processing is started, the processing of step 31 is first executed, and the system control unit 9 causes the current position calculation unit 8 to operate.
Samples the vehicle speed obtained by counting the pulses of the vehicle speed pulse sensor 5.

In step 32, it is judged whether or not the sampled vehicle speed is higher than 0 km / h and is equal to or less than the preset traffic congestion judgment speed V ₁ (for example, 20 km / h). If so, step 33
If NO, the process proceeds to step 35.

In step 33, it is determined whether or not the vehicle speed congestion determining timer (t _V1 ) is in operation. If YES, the process proceeds to step 37, and if NO, the process proceeds to step 34. In step 34, the speed congestion judgment timer t _V1 is started.

On the other hand, in step 35, the traffic congestion flag is cleared, and in step 36, the traffic congestion determination timer t _V1.
Is reset, the process proceeds to step 37, and this step 3
In step 7, it is determined whether or not the traffic congestion determination timer t _V1 is equal to or longer than the preset traffic congestion determination time t ₁ (for example, 10 minutes).

If the result of this determination is YES, the congestion flag is set in step 38, the speed congestion determination timer t _V1 is reset in step 39, and if NO, the interrupt processing is terminated without doing anything. Then, it returns to the main processing.

Next, the processing procedure for judging the congestion from the braking of the driver will be described with reference to the flowchart of FIG. The process shown in FIG. 4 is, for example, a hardware interrupt process from the brake sensor 6 to the system control unit 9.

When the processing is started, first, the processing of step 41 is executed, and whether the braking interval detecting timer t _B1 is smaller than the preset traffic jam judging braking interval time t ₃ (for example, 30 seconds). , And if the result of the determination is YES, the process proceeds to step 42, and if NO, the process proceeds to step 44.

In step 42, it is determined whether or not the braking traffic jam determination timer t _B2 is in operation. If the result of the determination is YES, the process proceeds to step 43, and if NO, the process proceeds to step 46.

When the process proceeds to step 43, the braking traffic jam determination timer t _B2 is started in this step 43.

On the other hand, in step 44, the traffic jam flag is cleared, in the next step 45, the braking traffic jam determination timer t _B2 is reset, and the routine proceeds to step 46.

In this step 46, the braking interval detecting timer t _B1 is reset. Then, the process proceeds to the next step 47.

In this step 47, it is judged whether or not the braking traffic jam judgment timer t _B2 is equal to or longer than the preset braking traffic jam judgment time t ₂ (for example, 10 minutes).

If the result of this determination is YES, the routine proceeds to step 48, at which the congestion flag is set, and at step 49 the braking congestion determination timer t _B2.
Is reset, and if NO, the interrupt process is terminated without doing anything and the process returns to the main process.

A simple summary of the above judgment processing during traffic congestion is that the vehicle speed is greater than 0 km / h and D ₁ (for example, 20 km
/ H) or less and running for t ₁ (for example, 10 minutes) or more, or the braking interval of the driver is t ₃ (for example, 3).
T ₂ (for example, 10 minutes) if less than 0 second)
When the above continues, the congestion flag is set.

Next, the operation on the display screen will be described with reference to FIG.
A brief description will be given with reference to FIG. First, in FIG. 5, the recommended route 53 is traveling from the current position A51A toward the destination 52.

Next, in FIG. 6, when the vehicle travels on the recommended route and reaches the point B, if the congestion is detected by the above-described congestion determination processing (FIGS. 3 and 4), the above-described processing (FIG. 2) is performed. ), The route search / extraction process is performed, the recommended route 54 is displayed, and guidance is performed so as to avoid a congested road.

In the above-mentioned embodiment, the judgment of the traffic congestion is made based on the vehicle speed and the braking by the driver, but it is also possible to use either one of them and, of course, both of them. It is also possible to use together. It is also possible to use the traffic information at the place where the traffic information can be obtained.

[0065]

As described above, according to the first aspect of the present invention, the traffic congestion detecting means provided in the vehicle detects the traveling state of the vehicle while the recommended route is traveling to judge the traffic congestion state, and the traffic congestion occurs. When the condition is detected, the recommended route is automatically searched and extracted again, a new recommended route is displayed, and guidance is provided.Therefore, the driver's operation is not required and safe and smooth driving is possible. It has the effect of making it possible.

According to the second aspect of the present invention, the presence or absence of traffic congestion is detected by the traffic congestion detecting means by monitoring the duration of the state in which the braking interval of the vehicle driver is less than or equal to the predetermined time. Congestion can be easily detected without using a complicated device or altitude sensor.

Further, according to the third aspect of the present invention, the presence or absence of traffic congestion is detected by the traffic congestion detection means by monitoring the duration of the state in which the speed of the vehicle is less than or equal to the predetermined value. It is possible to easily detect traffic congestion without using various devices or sophisticated sensors.

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall configuration of a vehicle-mounted navigation device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a processing procedure of the embodiment.

FIG. 3 is a flowchart for determining traffic congestion based on vehicle speed in the above embodiment.

FIG. 4 is a flowchart for determining traffic congestion from braking in the above embodiment.

FIG. 5 is an explanatory diagram showing an example of a display screen in the above embodiment.

FIG. 6 is an explanatory diagram showing a different example of the display screen example in the above embodiment.

FIG. 7 is a block diagram showing an overall configuration of a conventional vehicle-mounted navigation device.

[Explanation of symbols]

1 beacon transceiver 2 Map data storage 3 GPS receiver 4 Direction sensor 5 vehicle speed pulse sensor 6 Brake sensor 7 Route search and extraction section 8 Current position calculator 9 System control unit 10 Display control unit 11 Operation part 12 Display

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Katsuro Hayami             2-33 Miwa, Mita City, Hyogo Prefecture Mitsubishi Electric             Machine Mita Manufacturing Co., Ltd. (72) Inventor Koji Fujii             2-33 Miwa, Mita City, Hyogo Prefecture Mitsubishi Electric             Machine control software Himeji Co., Ltd.             Office Mita Branch

Claims (3)

[Claims] 1. A current position detecting means for detecting a current position of a vehicle, a destination specifying means for specifying a destination, a storage means for storing in a road and a road network, and a recommended route between the current position and the destination. The route search and extraction means for searching and extracting, the traffic jam detecting means provided in the vehicle for detecting the running state of the vehicle to judge the traffic jam state and detecting the presence or absence of traffic jam, and the information from the traffic jam detecting means are also included. And a route correction means for correcting the recommended route, a display control means for controlling the screen display,
A vehicle-mounted navigation device comprising display means for displaying according to a display signal from the display control means. 2. The traffic congestion detecting means detects the presence or absence of traffic congestion by monitoring the duration of a state in which the braking interval of the driver of the vehicle is a predetermined time or less. The vehicle-mounted navigation device described. 3. The vehicle-mounted navigation device according to claim 1, wherein the traffic jam detecting means detects the presence or absence of traffic jam by monitoring the duration of time when the speed of the vehicle is below a predetermined speed.