JP2002236949A - On-vehicle device for narrow area communication - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an on-vehicle device for narrow area communication capable of preventing an erroneous recognition of an on-road device that communication with a new on-vehicle device for communication has started. SOLUTION: The on-vehicle device for narrow area communication mounted on a vehicle has a high frequency circuit 2 sending and receiving data with the on-road device via an antenna 1, a control microcomputer 3 controlling the high frequency circuit 2, and a nonvolatile memory 4 storing the data, and it carries out narrow area communication between the on-road device including an automatic toll collecting process. The control microcomputer 3 saves an on-road device identification number and an identifier for registering communication used in execution of the narrow area communication in the nonvolatile memory 4, and if a received on-road device identification number is the same as the saved on-road device identification number in next communication, it carries out communication by using the last used identifier for registering communication saved in the nonvolatile memory 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle-mounted device for short-range communication used in an intelligent transportation system or the like, and particularly, can perform normal and consistent communication with a roadside system when the device is restarted. The present invention relates to an in-vehicle device for short-range communication.

[0002]

2. Description of the Related Art Intelligent transportation systems (ITS: Intell)
igent Transport System) is a roadside device installed on the roadside using Dedicated Short-Rage Communication (DSRC) that communicates only in a limited range on the road using microwave band radio waves. This is a system that provides a benefit to a driver and a road manager by communicating between a vehicle and a vehicle-mounted device for short-range communication provided on the vehicle side to exchange various data.

FIG. 6 is an explanatory view showing how a roadside device is installed. In FIG. 6, the road device 100 is a single-type road device, has one antenna 100a,
Usually, it communicates with the in-vehicle device for short-range communication only once. The plurality of road devices 100 provided on the road each have a unique road device identification number.

On the other hand, the road apparatus 200 is a type of road apparatus in which two road apparatuses are connected in tandem, and has two antennas 200a and 200b. It communicates with the in-vehicle device only once.
The first antenna 200a and the second antenna 200b have different antenna position identifiers and road device identification numbers.
The first antenna 200a and the second antenna 200b are generally 16 to 20 m apart.

[0005]

In a conventional on-vehicle device for short-range communication having such a configuration, the power of the device is turned off by an engine stall or the like in the communication area of the on-road device with which communication has been performed, and then the power is again supplied. When the power is turned on, the communication is performed using the newly generated communication registration identifier after the power is turned on or when the communication is started. Therefore, even within the communication area, the roadside device performs communication again because the communication registration identifier is different. That is, there is a problem that the same vehicle is recognized as two different vehicles.

Similarly, in the communication with the cascade-connected road devices, after the communication with the first road device is completed, before the communication with the second road device is started, the power of the device is turned off due to a stall or the like. When the power is turned on again and communication with the second road device is attempted, an identifier having a value different from the communication registration identifier communicated last time is used to communicate with the second road device, The on-road device determines that the in-vehicle device for short-range communication communicated by the first on-road device and the on-vehicle device for short-range communication communicated by the second on-road device are different, and the two or more cascaded on-road devices are connected. There is a problem that communication using the device cannot be performed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and it is possible to prevent a road device from erroneously recognizing that communication with a new on-vehicle device has been started. An object is to obtain an in-vehicle device for communication.

[0008]

An on-vehicle device for short-range communication according to the present invention is mounted on a vehicle, a high-frequency circuit for transmitting / receiving data to / from a road device via an antenna, a control microcomputer for controlling the high-frequency circuit, and An in-vehicle device for short-range communication having a non-volatile memory for storing data and performing short-range communication including automatic toll collection processing with a roadside device, wherein the control microcomputer is used when executing short-range communication. The on-road device identification number and the communication registration identifier are stored in the non-volatile memory, and at the next communication, if the received on-road device identification number is the same as the stored on-road device identification number, it is stored in the non-volatile memory. Communication is performed using the communication registration identifier used last time.

Further, the in-vehicle device for short-range communication according to the present invention is mounted on a vehicle, and a high-frequency circuit for transmitting and receiving data to and from a road device via an antenna, a control microcomputer for controlling the high-frequency circuit, and storing data. A non-volatile memory, a short-range communication in-vehicle device that performs short-range communication including an automatic toll collection process with a road device, the control microcomputer,
The antenna position identifier and the communication registration identifier used at the time of executing the short-range communication are stored in a nonvolatile memory, and at the next communication, the received antenna position identifier is that of the second antenna, and the stored antenna position is stored. If the identifier is that of the first antenna, communication is performed using the previously used communication registration identifier stored in the nonvolatile memory.

The on-vehicle device for short-range communication according to the present invention is mounted on a vehicle and stores a high-frequency circuit for transmitting and receiving data to and from a road device via an antenna, a control microcomputer for controlling the high-frequency circuit, and data. A non-volatile memory, a short-range communication in-vehicle device that performs short-range communication including an automatic toll collection process with a road device, the control microcomputer,
The antenna position identifier, the road device identification number, and the communication registration identifier used during execution of the short-range communication are stored in a nonvolatile memory, and at the next communication, the received antenna position identifier is that of the second antenna, and If the stored antenna position identifier is that of the first antenna, communication is performed using the previously used communication registration identifier stored in the nonvolatile memory, and the received antenna position identifier is the second antenna.
If the antenna position identifier is not that of the antenna, or the received antenna position identifier is that of the second antenna even if the received antenna position identifier is that of the second antenna,
If the received road device identification number is the same as the stored road device identification number, communication is performed using the previously used communication registration identifier stored in the nonvolatile memory.

Further, the control microcomputer generates a new communication registration identifier only when the previously used communication registration identifier is not used, and performs communication using this new communication registration identifier.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a block diagram showing a vehicle-mounted device for short-range communication according to the present invention. In FIG. 1, an in-vehicle device for short-range communication 50 mounted on a vehicle includes an antenna 1, a high-frequency circuit 2 for transmitting and receiving data to and from a road device via the antenna 1, and a control microcomputer 3 for controlling the high-frequency circuit 2. And a nonvolatile memory 4 for storing data.

FIG. 2 is a flowchart showing the operation of the in-vehicle device for short-range communication according to the present embodiment. The operation of the in-vehicle device for short-range communication 50 will be described with reference to FIG. This flowchart shows an operation when the power of the in-vehicle communication device is turned off by the engine stall or the like in the same communication area after the communication is completed, and then the power is turned on again to perform communication in the same communication area.

[0014] First, when the power to the first vehicle unit as 50 is turned on, the control microcomputer 3, an identifier for communication register to be used for communication randomly generated (step S1) communicates. After end of communication (step S2), and stores the identifier for the communication registers is used on the communication path apparatus identification number and an antenna location identifier in the non-volatile memory 4 (Step S
3). Then, the power supply of the in-vehicle device for short-range communication 50 is turned off by, for example, engine stall (step S4).

Next, when the power is turned on again to the on-vehicle communication device 50, first, the communication registration identifier used at the time of the last communication, the identification number of the roadside antenna device with which the last communication was performed, and the antenna. The position identifier is stored in the nonvolatile memory 4
(Step S5). Next, a communication registration identifier used for communication is newly newly generated (step S6).

When the communication is started and data is received from the state of waiting for reception (step S7), the identification number of the road antenna apparatus newly received from the road apparatus and the road number of the previous communication read out from the non-volatile memory 4 for the last communication were performed. The identification numbers of the antenna devices are compared (step S8). If they are the same, the communication registration identifier read from the non-volatile memory is used (step S10). If they are different, communication using the newly generated communication registration identifier is performed. Is performed (step S9).

After the communication is completed, the communication registration identifier, the identification number of the antenna device on the receiving path, and the antenna position identifier used in the communication are stored in the nonvolatile memory 4 (step S11).

The in-vehicle device for short-range communication 50 having the above-described configuration.
Has a high-frequency circuit 2 for transmitting and receiving data to and from a road device via an antenna 1, a control microcomputer 3 for controlling the high-frequency circuit 2, and a non-volatile memory 4 for storing data. A vehicle-mounted device for short-range communication that performs automatic short-range communication including automatic toll collection processing, wherein the control microcomputer 3 stores the roadside device identification number and the communication registration identifier used when executing the short-range communication in a nonvolatile manner. Save to memory 4,
In the next communication, if the received road device identification number is the same as the stored road device identification number, communication is performed using the previously used communication registration identifier stored in the nonvolatile memory 4. Therefore, when the power of the in-vehicle device for short-range communication is turned off due to an engine stall or the like in the communication area, after the power is turned on again, when communicating with the same road device, the communication registration identifier that communicated before the power was turned off Can be used, and it is possible to prevent the road device from erroneously recognizing that communication with the new on-vehicle communication device has started.

Embodiment 2 The configuration of the in-vehicle device for short-range communication according to the present embodiment is similar to that of the first embodiment. Figure 3 is a flowchart showing the operation of the narrow-band-vehicle unit as in the present embodiment. This flowchart is based on the assumption that, when communicating with a roadside device in which the first antenna and the second antenna are connected in cascade, after the communication with the first antenna is completed, before the communication with the second antenna is started, the power is turned off by an engine stall or the like. The operation when power is turned on again and communication with the second antenna is performed is shown.

Steps S1 to S3 are the same as in the first embodiment. Next, when the power is turned on again to the in-vehicle device for short-range communication 50, first, the identifier for communication registration used in the last communication, the identification number of the on-road antenna device in the last communication, and the antenna position The identifier is read from the nonvolatile memory 4 (Step S5). Next, a communication registration identifier used for communication is newly newly generated (step S6).

When communication is started and data is received from the state of waiting for reception (step S7), the antenna position identifier newly received from the road device and the antenna position identifier of the previous communication read out from the nonvolatile memory 4 are determined. If the received antenna position identifier is the second antenna and the antenna position identifier read from the non-volatile memory 4 is the first antenna (step S16), it is read from the non-volatile memory 4 (step S14). Communication is performed using the communication registration identifier (step S1).
7) On the other hand, in cases other than this condition, communication is performed using the newly generated communication registration identifier (step S1).
5).

After the communication is completed, the communication registration identifier, the identification number of the antenna device on the receiving path, and the antenna position identifier used in the communication are stored in the nonvolatile memory 4 (step S11).

The in-vehicle device for short-range communication having such a configuration is as follows.
A high-frequency circuit 2 mounted on a vehicle for transmitting and receiving data to and from a road device via an antenna 1, a control microcomputer 3 for controlling the high-frequency circuit 2, and a non-volatile memory 4 for storing data
A vehicle-mounted device for short-range communication that performs automatic short-range communication including automatic toll collection processing with a roadside device, wherein the control microcomputer 3 uses the antenna position identifier used when executing the short-range communication and the communication registration. Is stored in the non-volatile memory 4 when the received antenna position identifier is that of the second antenna and the stored antenna position identifier is that of the first antenna at the next communication. The communication is performed using the previously used communication registration identifier stored in the storage device 4. Therefore, during communication with a road device in which the first antenna and the second antenna are cascaded, if the power is turned off by an engine stall before the communication with the second antenna is started after the communication with the first antenna is completed. , After power on,
At the time of communication with the antenna, the same communication registration identifier as that of the road device of the first antenna can be used, so that communication between the first antenna and the road device in which the second antenna is cascaded is not erroneously recognized. It is possible to perform well.

Embodiment 3 FIG. The configuration of the in-vehicle device for short-range communication according to the present embodiment is similar to that of the first embodiment. FIG. 4 is a flowchart illustrating the operation of the in-vehicle device for short-range communication according to the present embodiment. This flowchart roughly combines the operations of the first and second embodiments. Steps S1 to S3 are the same as in the first or second embodiment and are omitted.

For example, when the power supply of the vehicle-mounted device 50 is turned off by an engine stall or the like (step S4), and then the power supply of the vehicle-mounted device 50 for short-range communication is turned on again, first, the device used for the previous communication is used. The read communication registration identifier, the identification number of the roadside antenna device with which the last communication was performed, and the antenna position identifier are read from the nonvolatile memory 4 (step S).
5). Next, a communication registration identifier used for communication is newly newly generated (step S6).

When communication is started and data is received from the state of waiting for reception (step S7), the antenna position identifier newly received from the roadside device and the antenna position identifier read from the non-volatile memory 4 for the previous communication are determined. If the received antenna position identifier is the second antenna and the antenna position identifier read from the non-volatile memory 4 is the first antenna (step S16), it is read from the non-volatile memory 4 (step S14). Communication is performed using the communication registration identifier (step S1).
7).

On the other hand, in the case other than this condition, the identification number of the roadside antenna device newly received from the roadside device is compared with the identification number of the roadside antenna device which performed the previous communication read out from the nonvolatile memory 4 (step S1). S8) If they are the same, use the communication registration identifier read from the non-volatile memory (step S10); if different, perform communication using the newly generated communication registration identifier (step S10).
9).

After the communication is completed, the communication registration identifier, the identification number of the antenna device on the receiving path, and the antenna position identifier used in the communication are stored in the nonvolatile memory 4 (step S11).

The in-vehicle device for short-range communication having such a configuration is
A high-frequency circuit 2 mounted on a vehicle for transmitting and receiving data to and from a road device via an antenna 1, a control microcomputer 3 for controlling the high-frequency circuit 2, and a non-volatile memory 4 for storing data
A vehicle-mounted device for short-range communication that performs short-range communication including an automatic toll collection process with a road-side device, wherein the control microcomputer 3 includes an antenna position identifier used when executing the short-range communication and the road-side device. The identification number and the communication registration identifier are stored in the non-volatile memory 4, and at the next communication, the received antenna position identifier is that of the second antenna, and the stored antenna position identifier is that of the first antenna. If so, communication is performed using the previously used communication registration identifier stored in the non-volatile memory 4, and the received antenna position identifier is not that of the second antenna, or the received antenna position identifier is If the stored antenna position identifier is not that of the first antenna even for the second antenna, the received road device identification number is the same as the stored road device identification number. If the, communicate using the communication registration for the identifier of the last used that had been stored in non-volatile memory 4. Therefore, when the power of the in-vehicle device for short-range communication is turned off due to an engine stall or the like in the communication area, after the power is turned on again, when communicating with the same road device, the communication registration identifier that communicated before the power was turned off. Can be used to prevent the roadside device from erroneously recognizing that the communication with the new on-vehicle device for communication has been started, and can communicate with the roadside device in which the first antenna and the second antenna are cascaded. At the time, when the power is turned off due to an engine stall or the like before the communication with the second antenna is started after the communication with the first antenna is completed, when the communication with the second antenna is performed after the power is turned on, on the road of the first antenna. Since the same communication registration identifier as that of the device can be used, communication with a road device in which the first antenna and the second antenna are cascade-connected can be performed well without erroneous recognition.

Embodiment 4 The configuration of the in-vehicle device for short-range communication according to the present embodiment is similar to that of the first embodiment. FIG. 5 is a flowchart showing the operation of the in-vehicle device for short-range communication according to the present embodiment. This flowchart is obtained by partially changing the operation of the third embodiment.

In the first to third embodiments, before starting the communication, a communication registration identifier to be used for the communication is newly generated unconditionally at random (step S6). Only when the used communication registration identifier is not used, that is, only when a new communication registration identifier is used, a new communication registration identifier is generated and communication is performed using this.

Specifically, in FIG. 5, communication is performed using the newly generated communication registration identifier (step S).
9) Only before the step, there is a step of randomly generating a new communication registration identifier to be used for communication (step S6).

The in-vehicle device for short-range communication having such a configuration is as follows.
The control microcomputer 3 generates a new communication registration identifier only when the previously used communication registration identifier is not used,
Communication is performed using this. For this reason, unnecessary processing is eliminated and the operation is accelerated, and the control sequence is shortened to save memory.

[0034]

The in-vehicle device for short-range communication according to the present invention comprises:
It has a high-frequency circuit that is mounted on the vehicle and transmits and receives data to and from a road device via an antenna, a control microcomputer that controls the high-frequency circuit, and a nonvolatile memory that stores data. The control microcomputer stores the road device identification number and the communication registration identifier used in the execution of the short-range communication in the non-volatile memory, and performs the next communication. Sometimes, if the received road device identification number is the same as the stored road device identification number, communication is performed using the previously used communication registration identifier stored in the non-volatile memory. for that reason,
When the power of the in-vehicle device for short-range communication is turned off due to an engine stall in the communication area, after turning on the power again, when communicating with the same road device, use the communication registration identifier that communicated before turning off the power. possible and then, the road device can be prevented from being erroneously recognized that the communication with the vehicle-mounted device device for the new communication is started.

Further, the on-vehicle device for short-range communication according to the present invention is mounted on a vehicle, and stores a high-frequency circuit for transmitting and receiving data to and from a road device via an antenna, a control microcomputer for controlling the high-frequency circuit, and data. A non-volatile memory, a short-range communication in-vehicle device that performs short-range communication including an automatic toll collection process with a road device, the control microcomputer,
The antenna position identifier and the communication registration identifier used at the time of executing the short-range communication are stored in a nonvolatile memory, and at the next communication, the received antenna position identifier is that of the second antenna, and the stored antenna position is stored. If the identifier is that of the first antenna, communication is performed using the previously used communication registration identifier stored in the nonvolatile memory. Therefore, at the time of communication with a road device in which the first antenna and the second antenna are cascaded, after the communication with the first antenna is completed,
If the power is turned off due to engine stall before starting communication with the second antenna, the same communication registration identifier as the on-road device of the first antenna can be used when communicating with the second antenna after the power is turned on. Therefore, it is possible to satisfactorily perform communication with a road device in which the first antenna and the second antenna are cascaded without erroneous recognition.

The on-vehicle device for short-range communication according to the present invention is mounted on a vehicle and stores a high-frequency circuit for transmitting and receiving data to and from a road device via an antenna, a control microcomputer for controlling the high-frequency circuit, and data. A non-volatile memory, a short-range communication in-vehicle device that performs short-range communication including an automatic toll collection process with a road device, the control microcomputer,
The antenna position identifier, the road device identification number, and the communication registration identifier used during execution of the short-range communication are stored in a nonvolatile memory, and at the next communication, the received antenna position identifier is that of the second antenna, and If the stored antenna position identifier is that of the first antenna, communication is performed using the previously used communication registration identifier stored in the nonvolatile memory, and the received antenna position identifier is the second antenna.
If the antenna position identifier is not that of the antenna, or the received antenna position identifier is that of the second antenna even if the received antenna position identifier is that of the second antenna,
If the received road device identification number is the same as the stored road device identification number, communication is performed using the previously used communication registration identifier stored in the nonvolatile memory. Therefore, when the power of the in-vehicle device for short-range communication is turned off due to an engine stall or the like in the communication area, after the power is turned on again, when communicating with the same road device, the communication registration identifier that communicated before the power was turned off. Can be used to prevent the roadside device from erroneously recognizing that the communication with the new on-vehicle device for communication has been started, and can communicate with the roadside device in which the first antenna and the second antenna are cascaded. At the time, when the power is turned off due to an engine stall or the like before the communication with the second antenna is started after the communication with the first antenna is completed, when the communication with the second antenna is performed after the power is turned on, on the road of the first antenna. In order to use the same communication registration identifier as the device,
Communication with a road device in which the first antenna and the second antenna are connected in cascade can be performed well without erroneous recognition.

Further, the control microcomputer generates a new communication registration identifier only when the previously used communication registration identifier is not used, and performs communication using the new communication registration identifier. Therefore, unnecessary operations are eliminated and the operation is accelerated, and the control sequence is shortened to save memory.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an in-vehicle device for short-range communication according to the present invention.

FIG. 2 is a flowchart illustrating an operation of the in-vehicle device for short-range communication according to the first embodiment;

FIG. 3 is a flowchart showing an operation of the in-vehicle device for short-range communication according to the second embodiment.

FIG. 4 is a flowchart showing an operation of the in-vehicle device for short-range communication according to the third embodiment.

FIG. 5 is a flowchart showing an operation of the in-vehicle device for short-range communication according to the fifth embodiment.

FIG. 6 is an explanatory diagram showing how to install a road device.

[Explanation of symbols]

1 antenna, 2 high frequency circuit, 3 control microcomputer, 4
Non-volatile memory, 50 In-vehicle device for narrow area communication.

Claims (4)

[Claims] 1. A high-frequency circuit mounted on a vehicle for transmitting and receiving data to and from a road device via an antenna, a control microcomputer for controlling the high-frequency circuit, and a nonvolatile memory for storing data. A narrow-area communication in-vehicle device that performs short-range communication including automatic toll collection processing between the on-board device and the control microcomputer, wherein the on-road device identification number and the communication registration identifier used at the time of executing the short-range communication are If the received roadside device identification number is the same as the stored roadside device identification number at the next communication, the communication device uses the previously used communication registration identifier stored in the nonvolatile memory. An in-vehicle device for short-range communication, wherein communication is performed by communication. 2. A high-frequency circuit mounted on a vehicle for transmitting and receiving data to and from a road device via an antenna, a control microcomputer for controlling the high-frequency circuit, and a nonvolatile memory for storing data. A short-range communication in-vehicle device for performing short-range communication including automatic toll collection processing between the non-volatile communication device and the non-volatile communication device. If the received antenna position identifier is that of the second antenna and the stored antenna position identifier is that of the first antenna at the time of the next communication, it is stored in the nonvolatile memory. An in-vehicle device for short-range communication, wherein communication is performed using a communication registration identifier used last time. 3. A high-frequency circuit mounted on a vehicle for transmitting and receiving data to and from a road device via an antenna, a control microcomputer for controlling the high-frequency circuit, and a non-volatile memory for storing data. The in-vehicle device for short-range communication which performs short-range communication including automatic toll collection processing between the antenna, the control microcomputer, the antenna position identifier and the road device identification number used when executing the short-range communication, and communication registration The identifier is stored in the non-volatile memory, and in the next communication, if the received antenna position identifier is that of the second antenna and the stored antenna position identifier is that of the first antenna, the non-volatile memory The communication is performed using the communication registration identifier of the last use stored in the antenna, and the received antenna position identifier is not that of the second antenna, or If the stored antenna position identifier is not that of the first antenna even if the received antenna position identifier is that of the second antenna, if the received road device identification number is the same as the stored road device identification number, An in-vehicle device for short-range communication, wherein communication is performed using the previously used communication registration identifier stored in the nonvolatile memory. 4. The control microcomputer according to claim 1, wherein a new communication registration identifier is generated only when the previously used communication registration identifier is not used, and communication is performed using the new communication registration identifier. An in-vehicle device for narrow area communication according to any one of 1 to 3.