JP4165364B2 - In-vehicle system for road traffic information communication system. - Google Patents

Description

The present invention relates to an in-vehicle system for a road traffic information communication system .

Conventionally, VICS has judged the degree of traffic congestion in the section based on the travel time between road light beacons. However, when there are multiple routes between road light beacons, it cannot judge the detailed traffic congestion degree. (VICS is a registered trademark) . Therefore, in recent years, it is possible to determine the degree of detailed traffic congestion and the traffic congestion level for roads around the road light beacon installation location by transmitting the travel time between the links of the road map data used in the car navigation device to the beacon. It became so.

As such VICS uplink data, there is a method in which travel time and the like are measured for each link of road map data used by the car navigation apparatus, and the travel time and the like are uplink transmitted to a road light beacon (VICS is registered). Trademark) .

In this case, the car navigation device counts the travel time for each link and the timer value (time) when the latest link is completed with a timer provided in the car navigation device. The VICS in-vehicle device counts a travel time between road light beacons and a timer value (time) when the current light beacon passes through a timer provided in the VICS on-vehicle device (VICS is a registered trademark) .

  Then, the travel time measurement detailed information set by using the travel time counted by the timer provided in each of the car navigation device and the VICS in-vehicle device, the timer value, and the like is uplink transmitted to the road light beacon. (VICS is a registered trademark of the Road Traffic Information and Communication System Center.)

  However, since the car navigation device and the VICS in-vehicle device are often separated and independent and each has an independent timer, the count value by the timer of the car navigation device and the timer of the VICS in-vehicle device is not synchronized, There was a problem of setting inappropriate travel time measurement details.

The present invention has been made in view of the above problems, and an object thereof is to provide an in-vehicle system for a road traffic information communication system capable of setting appropriate travel time measurement detailed information.

In order to achieve the above object, an in-vehicle system for a road traffic information communication system according to claim 1, a detection means for detecting a current position of a vehicle, a road is divided into a plurality of roads, and the divided individual roads are linked data. As a storage means, a car navigation device provided with a first internal timekeeping means for time keeping, a communication means for communicating with road light beacons installed at a plurality of points on the road, and time keeping a road traffic information board system for a communication system having a road traffic information-vehicle device for a communication system that includes a second internal timer means, road traffic information board system for a communication system, as a travel time measurement details The time when the vehicle completes the link and the time when the road light beacon passes are uplink-transmitted to the road light beacon. With reference to the time measured by either one of the internal time measuring means, there is provided setting means for setting the time when the link is completed and the time when the road light beacon passes in the travel time measurement detailed information. .

  In this way, the time when the link is completed in the travel time measurement detailed information and the time when the road light beacon passes are counted based on the time measured by either the first internal time measuring means or the second internal time measuring means. Therefore, even when the first internal time measuring means and the second internal time measuring means are not synchronized, appropriate travel time measurement detailed information can be set.

  Thus, since the time obtained by adding the travel time from the link completion time to the next road light beacon to the next road light beacon is set as the time when the road light beacon passes, the first internal time measuring means is used as a reference. As described above, it is possible to set the time when the link completes the travel time measurement detailed information and the time when the road light beacon passes.

In the in-vehicle system for a road traffic information communication system according to claim 2 , the car navigation device transmits a link completion signal to the setting means when the vehicle completes one link, and the setting means includes the second internal The time measured by the time measuring means is set as the time when the road light beacon passes in the travel time measurement detailed information, and the time when the link completion signal is acquired is measured by the second internal time measuring means. It is set as the time when the link is completed in the travel time measurement detailed information.

  As described above, the time when the link completion signal is acquired is measured by the second internal time measuring means, and the time is set as the time when the link is completed, so the travel time measurement detailed information is included in the second time measuring means as a reference. The time at the completion of the link and the time when the road light beacon passes can be set.

FIG. 1 is a block diagram showing a schematic configuration of a VICS in-vehicle system according to an embodiment of the present invention. The VICS in-vehicle system includes an operation / display unit 1, a car navigation ECU (navigator ECU) 2, a VICS in-vehicle device 3, an optical beacon transmitting / receiving device 4 and the like (VICS is a registered trademark) .

  The operation unit / display unit 1 includes, for example, a liquid crystal display having a touch switch integrated with a display screen. The operation unit / display unit 1 displays a road map around the vehicle generated by map data, a touch switch as an operation unit corresponding to a predetermined function, information received from a road light beacon, and the like.

  The navigation ECU 2 is configured as a normal computer, and includes a well-known CPU, ROM, RAM, I / O, and a bus line for connecting these configurations. In the ROM, a program to be executed by the navigation device is written, and a CPU or the like executes predetermined arithmetic processing according to this program.

  The navigation ECU 2 is connected to a map data storage unit (not shown), and the map data storage unit stores road data and the like necessary for displaying a map screen on the operation unit / display unit 1. . This road data includes node information regarding points where a plurality of roads intersect, merge and branch, and link information regarding roads connecting the points.

  As this link information, a link ID, which is a unique number for identifying the link, a link class for identifying an expressway, a toll road, a general road, the start and end coordinates of the link, a link, Information relating to the link itself, such as the link length indicating the length of the map, is stored in the map data storage unit.

  Further, as the node information, information such as a node ID which is a unique number of nodes connecting the links, right / left turn prohibition at intersections, presence / absence of traffic lights, and the like are stored in the map data storage unit. Further, as link connection information, for example, data indicating whether or not traffic is allowed for one-way traffic or the like is stored in the map data storage unit.

The VICS in-vehicle device 3 includes a communication interface (communication I / F) 31 between the navigation ECU 2 and the VICS in-vehicle device 3, a CPU 32, a logic processing unit 33, a communication interface (communication I / F) 34 with an optical beacon transmission / reception unit, and a crystal. An oscillator 35 is provided (VICS is a registered trademark) .

The optical beacon transmitter / receiver 4 includes a communication interface (communication I / F) 41 with the VICS in-vehicle device 3, a light emitting unit 42 including a light emitting diode (LED) 42a, a drive circuit 42b, and a photodiode (PD) 43a, AMP comprising a light receiving portion 43 made of the circuit 43 b (VICS is a registered trademark).

Next, the operation of the VICS in-vehicle device shown in FIG. 1 will be described. VICS is necessary for passengers in vehicles by exchanging data between the road light beacon connected to the traffic information center and the VICS in-vehicle device installed in the vehicle by bidirectional communication using light (wavelength 850 nm). Information is provided as downlink data (VICS is a registered trademark) .

  Downlink data transmitted from the road light beacon to the vehicle side includes traffic information indicating a congested road, construction information indicating the location of the construction site, accident information indicating the location of the accident site, and closed information indicating a closed road. Can be mentioned.

When the VICS in-vehicle device 3 receives the downlink data from the road light beacon, the CPU 32 in the VICS in-vehicle device 3 sets the uplink data, and the uplink data is synchronized with a predetermined clock from the crystal oscillator 35. It transmits to the logic processing part 33 (VICS is a registered trademark) .

  The logic processing unit 33 performs coding processing to transmit the received uplink data to the road optical beacon, and transmits the uplink data to the light emitting unit 42 of the optical beacon transmission / reception device 4 via the communication I / F 34 and the communication I / F 41. . In the light emitting unit 42 that has received the uplink data, the drive circuit 42b causes the LED 42a to emit light and uplink transmits the uplink data to the road light beacon.

The road optical beacon that has received the uplink data transmits a signal indicating that the uplink data has been received to the VICS in-vehicle device 3 (optical beacon transmitting / receiving device 4). Further, the road light beacon calculates the degree of traffic congestion and the like based on the received uplink data (VICS is a registered trademark) .

  In the optical beacon transmitting / receiving device 4, downlink data from the road optical beacon is received by the PD 43 a of the light receiving unit 43, amplified by the AMP circuit 43 b, and sent to the communication I / F 41.

The communication I / F 41 transmits this downlink data to the communication I / F 34 of the VICS in-vehicle device 3. Further, the downlink data is decoded by the logic processing unit 33 and transmitted to the operation unit / display unit 1 through the CPU 32, the communication I / F 31, and the navigation ECU 2. Then, the operation unit / display unit 1 displays information (downlink data) obtained from the road light beacon (VICS is a registered trademark) .

  Here, the setting of the travel time measurement detailed information which is a part of the uplink data will be described. FIG. 2A is an explanatory diagram illustrating a data configuration of travel time measurement detailed information according to the embodiment of the present invention, and FIG. 2B is an explanatory diagram illustrating a data configuration of an information block in the travel time measurement detailed information. is there.

  In the data structure of the travel time measurement detailed information shown in FIG. 2, detailed description regarding points that are well-known techniques will be omitted, and only the points related to the characteristic points of the present invention will be described in detail here. Further, the detailed travel time measurement information here will be described on the assumption that link A, link B, and link C in the road data are completed during the period from the road light beacon that the vehicle has passed through to the road light beacon that this time passes. .

FIG. 3 is a flowchart showing the travel time measurement detailed information setting process by the VICS in-vehicle system according to the embodiment of the present invention (VICS is a registered trademark) .

  As shown in FIG. 2, the travel time measurement detailed information, which is a part of the uplink data, includes travel time measurement information I1, a timer value (time) I2 when the optical beacon passes on the circuit, a link layer, and the number of information blocks. It consists of I3, information block, and the like.

The travel time measurement information I1 is the travel time from the road light beacon that passed the previous time counted by the timer of the VICS in-vehicle device 3 to the road light beacon that passed this time. The timer value (time) I2 when the current circuit optical beacon passes is the timer value (time) when the current circuit optical beacon counted by the timer of the VICS in-vehicle device 3 (VICS is a registered trademark). )

  The first information block includes a timer value (time) when the latest link is completed, the number of continuously completed links, link C detailed information, link B detailed information, link A detailed information, and the like. Other information is included in the second and third information blocks.

  The timer value (time) at the time of completion of the latest link is the timer value (time) at the time of completion of the latest link counted by the timer of the navigation ECU 2. The link C detailed information includes the link travel time of the link C counted by the timer of the navigation ECU 2. Also, the same information is included for the link B detailed information and the link A detailed information.

The setting process of the travel time measurement detailed information by the VICS in-vehicle device shown in FIG. 3 starts when the CPU 32 in the VICS in-vehicle device 3 receives the link travel time for each link in the road data from the navigation ECU 2. The navigation ECU 2 completes one link, and transmits the link travel time to the CPU 32 in the VICS in-vehicle device 3 when the link travel time is measured (VICS is a registered trademark) .

In step S1, when the CPU 32 in the VICS in-vehicle device 3 receives the link travel time and the timer value (time) when the link is completed from the navigation ECU 2, the CPU 32 receives the link travel time and the timer value (time) when the link is completed. Then, the elapsed time from receiving the next downlink data from the road optical beacon is counted by a timer (VICS is a registered trademark) .

In step S2, the CPU 32 in the VICS in-vehicle device 3 determines whether downlink data has been received from the road light beacon. If downlink data has been received, the process proceeds to step S3. If not, step 32 is performed. Repeat the process in S1 (VICS is a registered trademark) .

In step S3, travel time measurement detailed information is set. First, the CPU 32 in the VICS in-vehicle device 3 receives the downlink data from the road optical beacon that passes this time from the timer value (time) at the time of the latest link completion received from the elapsed time counted in step S1. Is set to Δt. Then, the CPU 32 in the VICS in-vehicle device 3 adds this elapsed time Δt to the timer value (time) at the time of completion of the latest link counted by the timer of the navigation ECU 2. Then, the CPU 32 in the VICS in-vehicle apparatus 3 sets the travel time measurement detailed information as the timer value (time) I2 when the added value passes the optical beacon on the circuit (VICS is a registered trademark) .

In step S4, the CPU 32 in the VICS in-vehicle device 3 transmits uplink data including the travel time measurement detailed information set in step S3 to the logic processing unit 33 in synchronization with a predetermined clock from the crystal oscillator 35. The logic processing unit 33 performs coding processing to transmit the received uplink data to the road optical beacon, and transmits the uplink data to the light emitting unit 42 of the optical beacon transmission / reception device 4 via the communication I / F 34 and the communication I / F 41. . Then, the light emitting unit 42 that has received the uplink data causes the LED 42a to emit light by the drive circuit 42b and uplink transmits the uplink data to the road light beacon (VICS is a registered trademark) .

In this way, by using the value obtained by adding the elapsed time Δt to the timer value (time) when the latest link is completed, as the timer value (time) I2 when the travel time measurement detailed information passes the optical beacon on the current circuit, Appropriate travel time measurement detailed information that is not affected by the synchronization between the timer of the navigation ECU 2 and the timer of the VICS in-vehicle device 3 can be set (VICS is a registered trademark) .

(Modification)
As a modified example, the link travel time counted by the timer of the navigation ECU 2 in the above embodiment and the timer value (time) at the completion of the link may be counted by the timer in the VICS in-vehicle device 3 ( VICS is a registered trademark) .

In this case, when the navigation ECU 2 completes the link and reaches the node, the navigation ECU 2 has a signal indicating that the node has been reached (hereinafter referred to as a node signal) and link information from the node to the next node (hereinafter referred to as the link). ( Referred to as a signal ) is transmitted to the CPU 32 in the VICS in-vehicle device 3 (VICS is a registered trademark) .

The CPU 32 in the VICS in-vehicle device 3 that has received the node signal and the link signal sets the timer value (time) when the node signal and the link signal are received as the timer value (time) when the link is completed, and the link. Calculate travel time. Similarly, the CPU 32 continues to count the timer, and uses the timer value (time) when the next node signal and link signal are received as the timer value (time) when the next link completes (VICS is a registered trademark). ).

When the CPU 32 in the VICS in-vehicle device 3 receives the downlink data from the road light beacon, the travel time measurement detailed information is obtained from the node signal and the link signal timer value (time) received from the navigation ECU 2 before the reception. Is set as the timer value (time) when the latest link is completed (VICS is a registered trademark) .

Thus, by using the timer value (time) counted by the timer in the VICS in-vehicle device 3 as the timer value (time) when the latest link of the travel time measurement detailed information is completed, the timer of the navigation ECU 2 and the VICS in-vehicle system are used. Appropriate travel time measurement detailed information that is not affected by the synchronization with the timer of the device 3 can be set (VICS is a registered trademark) .

It is a block diagram which shows schematic structure of the VICS vehicle-mounted apparatus in embodiment of this invention (VICS is a registered trademark) . (A) is explanatory drawing which shows the data structure of the travel time measurement detailed information in embodiment of this invention, (b) is explanatory drawing which shows the data structure of the information block in travel time measurement detailed information. FIG. 3 is a flowchart showing a setting process of travel time measurement detailed information by the VICS in-vehicle device according to the embodiment of the present invention (VICS is a registered trademark) .

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Operation / display part, 2 Car navigation ECU (navigation ECU), 3 VICS vehicle-mounted apparatus, 31 Communication interface (communication I / F), 32 CPU, 33 Logic processing part, 34 Communication interface (communication I / F), 35 Quartz Oscillator, 4 optical beacon transmitter / receiver, 41 communication interface unit (communication I / F), 42 light emitting unit, 42a light emitting diode (LED), 42b driving circuit, 43 light receiving unit, 43a photodiode (PD), 43b AMP circuit

Claims (2)

Car navigation system comprising detection means for detecting the current position of the vehicle, storage means for dividing the road into a plurality of parts and storing the divided roads as link data, and first internal timekeeping means for measuring time Equipment,
And road traffic information vehicle apparatus communication system having a communication means for communicating with the installed road light beacon multiple locations of the street, and a second internal timer means for measuring time,
An in- vehicle system for a road traffic information communication system having
The in-vehicle system for the road traffic information communication system is to transmit uplink time to the road light beacon as the travel time measurement detailed information, the time when the link of the vehicle is completed and the time when the road light beacon passes,
Based on the time measured by either one of the first internal time measuring means and the second internal time measuring means, the time when the link is completed and the time when the road light beacon passes in the travel time measurement detailed information With setting means for setting,
The first internal time measuring means measures the time when the link is completed, and transmits the time measured to the setting means.
The setting means sets the time measured by the first internal time measuring means as the time of link completion in the travel time measurement detailed information and acquires the time of link completion when the second time is acquired. The travel time from when the link completion time is acquired by the internal time measuring means until the next time when the light beacon passes on the road is counted, and the time obtained by adding the travel time to the acquired link completion time is An in- vehicle system for a road traffic information communication system, which is set as a time when a road light beacon passes in detailed travel time measurement information. The car navigation device transmits a link completion signal to the setting means when the vehicle has completed one link.
The setting means sets the time measured by the second internal time measuring means as the time when the road light beacon passes in the travel time measurement detailed information, and sets the time when the link completion signal is acquired. 2. The in-vehicle system for a road traffic information communication system according to claim 1, wherein time is measured by an internal time measuring means, and the time is set as a time when the link is completed in the travel time measurement detailed information.

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