JP2006352849A - In-vehicle power line communication system, data transmitter and data receiver for in-vehicle power line communication, in-vehicle power line communication method and in-vehicle power line communication program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure real-time communication quality without affecting the other apparatus even if a plurality of additional in-vehicle devices are connected in an in-vehicle power line communication system, a data transmitter and a data receiver for in-vehicle power line communication, and an in-vehicle power line communication method. <P>SOLUTION: The disclosed method includes: a step S01 of transmitting a pilot tone from the data transmitter to the data receiver; a step S03 of detecting a frequency band wherein a notch exists out of frequency bands utilized for communication based on the pilot tone; a step S05 of transmitting the information of the detected frequency band wherein the notch exists as channel information; a step S07 of setting a channel of a frequency band wherein a notch does not exist as a transmission channel utilized for communication; and a step S09 of disposing original data transmitted in the transmission channel as transmission data and then transmitting the transmission data. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an in-vehicle power line communication system that performs data communication between in-vehicle devices via a power line of a vehicle, a data transmission device and a data reception device for in-vehicle power line communication, an in-vehicle power line communication method, and an in-vehicle power line communication program.

  In recent years, it has been studied to perform data communication between in-vehicle devices such as an in-vehicle device mounted in advance on a vehicle and an in-vehicle device attached later using a power line of the vehicle. Examples of in-vehicle devices that are preinstalled in the vehicle include car audio devices and car navigation devices. In-vehicle devices that are retrofitted to the vehicle include ETC (Electronic Toll Collection) in-vehicle devices and back monitor cameras. The power line supplies power to each in-vehicle device from a power source such as a battery provided in the vehicle, and is connected directly to the in-vehicle device mounted in advance in the vehicle and is installed later. Is connected via a cigar socket or the like.

  As a power line communication technique in this vehicle, for example, Patent Document 1 proposes a method of setting the frequency of a communication signal transmitted through a power line based on the noise frequency and the impedance characteristic of the power line. This eliminates the influence of noise and reduces the attenuation of the communication signal to achieve highly reliable communication.

Japanese Patent Laying-Open No. 2004-343796 (Claims, FIG. 1)

The following problems remain in the conventional technology.
That is, in the conventional power line communication technology in a vehicle, when a plurality of on-vehicle devices to be retrofitted are connected, the impedance and noise of the power line change from moment to moment, which effectively eliminates the influence of noise and reduces signal attenuation. However, there is a disadvantage that the communication quality is deteriorated for a certain time. In particular, when communication quality deteriorates in a real-time application signal such as an audio signal or a video signal, there is a disadvantage that the reproduction reliability of audio or video is lowered.

  The present invention has been made in view of the above-described problems. An in-vehicle power line communication system that can ensure real-time communication quality without affecting other devices even if a plurality of in-vehicle devices are connected, and in-vehicle It is an object to provide a data transmission device and data reception device for power line communication, an in-vehicle power line communication method, and an in-vehicle power line communication program.

  The present invention employs the following configuration in order to solve the above problems. That is, the in-vehicle power line communication system of the present invention is the in-vehicle power line communication system that performs communication via the power line of the vehicle between the data transmission device and the data reception device of a plurality of in-vehicle devices of the vehicle. A pilot tone transmitting means for transmitting a pilot tone to the data receiving device, and a channel for receiving channel information which is information on a frequency band in which there is no notch returned from the data receiving device according to the pilot tone. Information receiving means, transmission channel setting means for setting a transmission channel to be used in the communication based on the channel information, and first data for performing processing to arrange original data in the transmission channel to be transmission data Processing means, and data transmission means for transmitting the transmission data via a power line, The data receiving apparatus includes a pilot tone receiving means for receiving the pilot tone, a notch detecting means for detecting a notch existing in a frequency band used for the communication according to a reception state of the pilot tone, and the detected notch A transmission channel selection unit that selects the transmission channel while avoiding a frequency band in which the transmission channel exists, a channel information transmission unit that transmits information on the selected transmission channel as the channel information, and a transmission unit that receives the transmission data And a second data processing means for restoring the original data from the received transmission data.

  The data transmission device for in-vehicle power line communication according to the present invention is a data transmission device for in-vehicle power line communication that communicates with a data reception device of an in-vehicle device of a vehicle via the power line of the vehicle. Pilot tone transmitting means for transmitting pilot tones, channel information receiving means for receiving channel information which is information of a frequency band in which there is no notch returned from the data receiving apparatus according to the pilot tone, and the channel A transmission channel setting means for setting a transmission channel to be used in the communication based on information; a first data processing means for performing processing for arranging original data in the transmission channel to obtain transmission data; and the transmission data And a data transmission means for transmitting via a power line.

  In addition, a data receiving device for in-vehicle power line communication according to the present invention is a data receiving device for in-vehicle power line communication that communicates with a data transmitting device included in an in-vehicle device of a vehicle via the power line of the vehicle. A pilot tone receiving means for receiving a pilot tone; a notch detecting means for detecting a notch existing in a frequency band used for the communication according to a reception state of the pilot tone; and avoiding a frequency band in which the detected notch exists. Transmission channel selection means for selecting a transmission channel to be used when performing the communication, channel information transmission means for transmitting information on the selected transmission channel as power channel information via a power line, and original data in the transmission channel. A data receiver for receiving transmission data transmitted from the data transmission device When, and having a second data processing means for restoring the original data from the transmission data to the received.

  Further, the in-vehicle power line communication method of the present invention is the in-vehicle power line communication method in which communication is performed via the power line of the vehicle between the data transmission device and the data reception device of a plurality of in-vehicle devices of the vehicle. A first step of transmitting a pilot tone to the data receiving device from a frequency band in which a notch exists in a frequency band used for the communication by the data receiving device based on the received pilot tone. A second step of detecting, a third step of transmitting, as channel information, information on a frequency band in which the detected data notch exists to the data transmitting device, and a third step of transmitting the data transmitting device, A transmission channel that uses a channel of a frequency band in which no notch exists based on the transmitted channel information for the communication. And a fourth step of transmitting the transmission data to the data reception device after the data transmission device arranges the original data to be transmitted in the transmission channel to form transmission data. These steps are included.

  Moreover, the vehicle-mounted power line communication program of this invention WHEREIN: In the vehicle-mounted power line communication program which communicates via the power line of the said vehicle between the data transmitter which a some vehicle-mounted apparatus of a vehicle has, and a data receiver, The said data transmitter A first step of transmitting a pilot tone to the data receiving device from a frequency band in which a notch exists in a frequency band used for the communication by the data receiving device based on the received pilot tone. A second step of detecting, a third step of transmitting, as channel information, information on a frequency band in which the detected data notch exists to the data transmitting device, and a third step of transmitting the data transmitting device, Based on the transmitted channel information, a frequency band channel not having a notch is used for the communication. A fourth step of setting the transmission channel as a transmission channel, and the data transmission device transmits the transmission data to the data reception device after arranging the original data to be transmitted in the transmission channel as transmission data The fifth step is executed by a computer.

  In these inventions, when performing power line communication between in-vehicle devices of a vehicle, the carrier frequency is adaptively arranged and communication is performed avoiding the frequency band where the notch exists, so the frequency band where the notch does not exist This makes it possible to perform in-vehicle power line communication with high communication quality while minimizing the influence of noise and impedance characteristics using these channels.

  Furthermore, in the in-vehicle power line communication method of the present invention, in the first step, the data transmission device transmits the pilot tone by continuously changing the frequency, and in the second step, the continuous change. A frequency band in which the notch exists is detected based on a pilot tone. That is, according to the present invention, by detecting a frequency band in which a notch exists based on a continuously changing pilot tone, it is possible to select a channel in a wide frequency band that does not have a notch in a plurality of frequency bands.

  In addition, the in-vehicle power line communication method of the present invention detects a frequency band where a notch does not exist at a predetermined time interval even during the communication, and changes the transmission channel to a frequency band channel where a notch does not exist. It is characterized by that. In other words, in the present invention, since notch detection is continuously performed during power line communication, high communication quality in-vehicle power line communication using a channel in a frequency band in which no notch is always present is possible. Become.

The present invention has the following effects.
That is, according to the in-vehicle power line communication system, the in-vehicle power line communication data transmitting device and the data receiving device, the in-vehicle power line communication method, and the in-vehicle power line communication program according to the present invention, when performing power line communication between in-vehicle devices of the vehicle, Since communication is performed avoiding the frequency band where notches exist, high-quality in-vehicle power line communication becomes possible, and real-time without affecting other devices even if multiple on-board devices are connected. It is possible to continuously ensure good communication quality with little deterioration in applications. Therefore, in the present invention, good real-time communication such as audio signals and video signals can be obtained even if a plurality of retrofit on-vehicle devices such as audio devices and video devices are connected in the on-vehicle power line communication.

  Hereinafter, an embodiment of an on-vehicle power line communication system, an on-vehicle power line communication data transmission device and a data reception device, an on-vehicle power line communication method, and an on-vehicle power line communication program according to the present invention will be described with reference to FIGS. 1 to 6. .

As shown in FIG. 2, the data communication system 10 used for in-vehicle power line communication of the present embodiment is provided in the in-vehicle device and the power line 1 that supplies power to each in-vehicle device from a power source such as a battery provided in the vehicle. The data transmission device (data transmission device for in-vehicle power line communication) 2 and the data reception device (data reception device for in-vehicle power line communication) 3 provided in the in-vehicle device. In addition, the said vehicle equipment may be any of the vehicle equipment previously mounted in the vehicle and the vehicle equipment connected to the power line 1 via a cigar socket or the like.
The data transmission device 2 is connected to the power line 1 directly or via a cigar socket or the like. From the power line 1, power for driving the data transmission device 1 is supplied to the data transmission device 2. The data transmission device 2 transmits and receives data to and from the data reception device 3 through the power line 1.
The data receiving device 3 is connected to the power line 3 directly or via a cigar socket or the like. Power for driving the data receiving device 3 is supplied from the power line 1 to the data receiving device 3. The data receiving device 3 transmits and receives data to and from the data transmitting device 2 via the power line 1.

As shown in FIG. 3, the data transmission device 2 includes a pilot tone transmission unit 21, a channel information reception unit 22, a transmission channel setting unit 23, a data storage unit 24, a data processing unit 25, and a data transmission unit 26.
The pilot tone transmitter 21 has a function of continuously changing the pilot tone frequency. The pilot tone data whose frequency changes continuously is transmitted to the data receiving device 3 via the power line 1.

The channel information receiving unit 22 receives “channel information”, which is information of a channel in a frequency band in which a notch exists in a frequency band used for in-vehicle power line communication, from the data receiving device 3 via the power line 1. Further, the channel information receiving unit 22 outputs “channel information received via the power line 1” to the transmission channel setting unit 23.
The transmission channel setting unit 23 uses the channel information received from the channel information receiving unit 22 to generate a frequency not having a notch used when performing in-vehicle power line communication between the data transmitting device 2 and the data receiving device 3. The channel of the band is selected as the transmission channel.

In the data storage unit 24, music data, video data, and the like for transmission from the data transmission device 2 to the data reception device 3 are stored as original data. From the data storage unit 24, the original data stored in the data processing unit 25 is output.
The data processing unit 25 uses the transmission channel set by the transmission channel setting unit 23 to disperse and arrange the original data input from the data storage unit 24 in the frequency band where there is no notch to be transmission data. Processing is performed and output to the data transmission unit 26.
The data transmission unit 26 transmits the transmission data input from the data processing unit 25 to the data reception device 3 via the power line 1.

The data processing unit 25 described above has a circuit ll shown in FIG. The data processing unit 25 multiplies the four subchannels (X0-Y0, X1-Y1, X2-Y2, X3-Y3) by coefficients α and β recorded in a coefficient table (not shown), and performs addition / subtraction. Repeat the process. Hereinafter, a specific processing method of the circuit 11 shown in FIG. 4 will be described.
First, a result of multiplying the subchannel (X1-Y1) by the center frequency is obtained from the result of multiplying the subchannel (X0-Y0) by the center frequency. Next, the result of multiplying the subchannel (X2-Y2) by the center frequency is obtained from the result of multiplying the subchannel (X1-Y1) by the center frequency. Next, the result of multiplying the subchannel (X3-Y3) by the center frequency is obtained from the result of multiplying the subchannel (X2-Y2) by the center frequency.
In this way, the data processing unit 25 calculates a multi-channel signal (transmission data) Z that is a transmission signal using a recursive process.

In FIG. 4, the unit calculation unit 100 includes a combination of a multiplier, an adder, and a subtractor necessary for processing each subchannel in units of subchannels. Here, when the number of subchannels to be processed is desired to be increased, the unit arithmetic units 100 may be connected in multiple stages as many times as desired.
As described above, by using the recursive process, it is easy to change the hardware configuration in accordance with the change in the number of subchannels to be transmitted in the multi-channel communication system.
By configuring the data processing unit 25 as shown in FIG. 4, the sub-channels in the frequency band where the notch exists are not used for data transmission, and the original data is distributed to the sub-channels in the frequency band where the notch does not exist. By arranging and transmitting data, in-vehicle power line communication with good communication quality can be performed.

As shown in FIG. 5, the data receiving apparatus 3 includes a pilot tone receiving unit 31, a notch detecting unit 32, a used channel selecting unit 33, a channel information transmitting unit 34, a data receiving unit 35, a data processing unit 36, and a data reproducing unit 37. Have
The pilot tone receiving unit 31 has a function of receiving pilot tone data transmitted from the data transmitting apparatus 2 via the power line 1 and outputting the data to the notch detecting unit 32.

The notch detection unit 32 checks the notch state of the pilot tone input from the pilot tone reception unit 31, detects information on the frequency band in which the notch exists as “notch information”, and sends it to the channel selection unit 33. Output.
Based on the “notch information” input from the notch detection unit 32, the use channel selection unit 33 selects a transmission channel in a frequency band in which there is no notch used when performing in-vehicle power line communication with the data transmission device 2. This is selected and transmitted as “channel information” to the data transmission apparatus 2 via the power line 1. In addition, the used channel selection unit 33 outputs “channel information” to the data processing unit 35.

The data reception unit 35 receives “transmission data” transmitted from the data transmission device 2 via the power line 1 and outputs the data to the data processing unit 36.
Based on the “channel information” output from the used channel selection unit 33, the data processing unit 36 is distributed from the data receiving unit 35 to the transmission channel in the frequency band where there is no notch. Is restored and output to the data reproduction unit 37.
The data reproduction unit 37 reproduces “original data” input from the data processing unit 35.

  It should be noted that each processing unit of data in the data communication system 10, that is, a pilot tone transmission unit 21, a channel information reception unit 22, a transmission channel setting unit 23, a data storage unit 24, a data processing unit 25, a data transmission unit 26, a pilot tone The receiving unit 31, the notch detecting unit 32, the used channel selecting unit 33, the channel information transmitting unit 34, the data receiving unit 35, the data processing unit 36, the data reproducing unit 37 and the like are realized by dedicated hardware. In addition, each processing unit is configured by a memory and a CPU (central integrated device) as a computer system, and functions of each processing unit, an in-vehicle power line communication method of the present embodiment to be described later, and a program for realizing this method are provided. The function may be realized by loading it into a memory and executing it.

That is, the program is a computer-readable program, and may be for realizing a part of the above-described functions and a vehicle-mounted power line communication method described later.
Furthermore, the program may be a so-called difference file (difference program) that can realize the above-described functions in combination with a program already recorded in the computer system.

The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. The transmission medium refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a power line or a telephone line.
In addition, the memory includes a non-volatile memory such as a hard disk device, a magneto-optical disk device, and a flash memory, a recording medium that can only be read such as a CD-ROM, and a volatile memory such as a RAM (Random Access Memory). Or it shall consist of a computer-readable recording medium by these combination, and a writable recording medium.

Next, the in-vehicle power line communication method in the data communication system 10 according to the present embodiment will be described.
FIG. 1 is a sequence diagram showing the operation of the data communication system 10 of the present embodiment.
First, as shown in FIG. 6A, the pilot tone transmitting unit 21 of the data transmitting apparatus 2 changes the frequency of the pilot tone p continuously to f1, f2, f3, and f4 via the power line 1. To the data receiving device 3 (step S01).
Here, notches n1 and n2 as shown in FIG. 6 (b) are present in the frequency band received by the data receiving device 3 due to the influence of an in-vehicle device or the like connected to the power line 1 through a cigar socket or the like. The case where it has arisen is demonstrated.

The pilot tone receiving unit 31 of the data receiving device 3 receives the pilot tone transmitted from the pilot tone transmitting unit 21 of the data transmitting device 2 via the power line 1 (step S02).
Next, the notch detector 32 of the data receiver 3 detects whether or not a notch exists in the frequency band used for the received pilot tone (step S03).
In the communication environment of the power line 1 between the data transmitting device 2 and the data receiving device 3, notches n1 and n2 as shown in FIG. Distortions corresponding to the notches n1 and n2 also occur in the pilot tone (see FIG. 6C) received by the unit 31.

Next, the use channel selection unit 33 of the data reception device 3 selects a channel to be used for in-vehicle power line communication so as to avoid the frequency band in which the notch detected by the notch detection unit 32 exists (step S04).
Then, the channel information transmitting unit 34 of the data receiving apparatus 3 sets the channels c1, c2, c3, and c4 (see FIG. 6D) in the frequency bands in which the notch selected by the used channel selecting unit 33 does not exist as “channel information”. Then, the data is transmitted to the channel information receiving unit 22 of the data transmitting device 2 through the power line 1 (step S05).

The “channel information” transmitted from the channel information transmitting unit 34 is received by the channel information receiving unit 22 of the data transmitting apparatus 2 (step S06).
Based on the “channel information” received by the channel information receiving unit 22, the transmission channel setting unit 23 of the data transmission device 2 uses transmission channels c 1, c 2, c 3 in frequency bands that do not have a notch to be used for in-vehicle power line communication. , C4 (see FIG. 6D) are set (step S07).

The data processing unit 25 of the data transmission device 2 performs in-vehicle power line communication using the transmission channels cl, c2, c3, and c4 set by the transmission channel setting unit 23 on the original data stored in the data storage unit 24. As is performed, the original data is distributed and arranged in each channel to perform transmission data (step S08).
The data transmission unit 26 of the data transmission device 2 uses the original data arranged in the transmission channel without the notch in the data processing unit 25 as transmission data to the data reception unit 35 of the data reception device 3 via the power line 1. (Step S09).

The data receiving unit 35 of the data receiving device 3 receives transmission data from the data transmitting device 2 via the power line 1 (step S10).
Next, the data processing unit 35 of the data receiving device 3 restores the original data arranged in the transmission channel that has been received by the data receiving unit 35 and has no notch (step S11).
The data reproducing unit 37 of the data receiving device 3 reproduces the “original data” restored by the data processing unit 36 (step S12).

Conventionally, in-vehicle power line communication using the power line 1 has a problem that the power output from the data transmission device 2 cannot be increased due to the relationship between the leakage electric field and the power consumption. However, if the data communication system 10 according to the above-described embodiment of the present invention is used, the in-vehicle power line communication is performed as transmission data by distributing and arranging the original data to be transmitted in the channel of the frequency band where the notch is not generated. Therefore, power consumption required for communication can be reduced, and in-vehicle power line communication can be performed while maintaining good communication quality.
Moreover, since the power consumption required for in-vehicle power line communication can be reduced, the leakage electric field generated from the power line 1 can be reduced. Therefore, in-vehicle power line communication can be performed with better communication quality.

In particular, in order to maintain audio quality in audio equipment and the like, and to display continuously sent images in video equipment and the like, there is a problem that it is necessary to always ensure a communication speed of a certain speed or more. However, such a problem can be solved by using the data communication system according to the present embodiment. In other words, the data communication system for in-vehicle power line communication according to the present embodiment needs to display on-vehicle audio equipment whose sound quality deteriorates when communication quality deteriorates and image data transmitted continuously without delay. It is suitable for in-vehicle power line communication in in-vehicle video equipment and the like.
Moreover, since the in-vehicle power line communication is not performed using all the multi-channels, but a channel having no notch is selected and used, the power consumed by the data transmission device 2 can be reduced.

  In the above-described embodiment, the case where the notch detection is performed only once before the vehicle-mounted power line communication is started in step S03 in FIG. 1 is not limited to this. For example, while performing in-vehicle power line communication between the data transmission device 2 and the data reception device 3, notch detection is continuously performed, and communication is always performed using a channel in a frequency band where there is no notch. It is also possible to perform. With such a configuration, it is possible to improve communication quality when performing in-vehicle power line communication.

In the above-described embodiment, the state of the pilot tone transmitted from the pilot tone transmission unit 21 of the data transmission device 2 is checked by the notch detection unit 32 of the data reception device 3 to detect the frequency band where the notch exists. However, the present invention is not limited to this.
For example, instead of continuously changing the frequency of the pilot tone, the pilot tone is transmitted all at once in the entire frequency band used for communication, and the data receiving apparatus 3 receives the pilot tone and the frequency band in which the notch exists. By detecting this, it is also possible to perform in-vehicle power line communication using a frequency band where there is no notch.
In addition, when the data transmission device 2 selects an arbitrary channel from the frequency band in which communication is performed and transmits a pilot tone, and the data reception device 3 detects that a notch exists in the channel. However, it is also possible to perform in-vehicle power line communication by reselecting a channel of another frequency band.

  In the above-described embodiment, the case where the in-vehicle power line communication is performed using four or eight channels is described. However, the present invention is not limited to this, and the in-vehicle power line communication is performed using an arbitrary number of channels. Can be done.

  As mentioned above, although embodiment of this invention was described with reference to drawings, it is not limited to these embodiment about a concrete structure, The design change of the range which does not deviate from the summary of this invention, etc. Is possible.

It is a sequence diagram which shows the flow of a process in the data communication system 10 for vehicle-mounted power line communication by embodiment of this invention. It is a block diagram of the data communication system 10 of this embodiment. It is a block diagram which shows the structure of the data transmitter 2 of this embodiment. It is a circuit diagram of the circuit 1l which performs the data calculation process of this embodiment. It is a block diagram which shows the structure of the data receiver 3 of this embodiment. It is the figure which showed the waveform of the data at the time of performing data communication by this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Power line, 10 ... Data communication system (vehicle power line communication system), 2 ... Data transmission apparatus (data transmission apparatus for vehicle power line communication), 21 ... Pilot tone transmission part, 22 ... -Channel information receiving unit, 23 ... Transmission channel setting unit, 24 ... Data storage unit, 25 ... Data processing unit, 26 ... Data transmitting unit, 3 ... Data receiving device (in-vehicle power line communication Data receiving apparatus), 31... Pilot tone receiving unit, 32... Notch detecting unit, 33... Used channel selecting unit, 34... Channel information transmitting unit, 35. 36: Data processing unit, 37: Data reproduction unit

Claims (7)

In an in-vehicle power line communication system that performs communication via a power line of the vehicle between a data transmission device and a data reception device of a plurality of in-vehicle devices of the vehicle,
A pilot tone transmitting means for transmitting a pilot tone to the data receiving apparatus;
Channel information receiving means for receiving channel information which is information of a frequency band in which there is no notch returned from the data receiving device in response to the pilot tone;
Transmission channel setting means for setting a transmission channel to be used in the communication based on the channel information;
First data processing means for performing processing of arranging original data in the transmission channel to be transmission data;
Data transmission means for transmitting the transmission data via a power line,
Pilot tone receiving means for receiving the pilot tone from the data receiving device;
Notch detection means for detecting a notch existing in a frequency band used for the communication according to a reception state of the pilot tone;
Transmission channel selection means for selecting the transmission channel avoiding the detected frequency band in which the notch exists,
Channel information transmission means for transmitting the selected transmission channel information as the channel information via a power line;
Data receiving means for receiving the transmission data;
A vehicle-mounted power line communication system comprising: second data processing means for restoring the original data from the received transmission data. In the data transmission device for in-vehicle power line communication that communicates with the data reception device of the in-vehicle device of the vehicle through the power line of the vehicle,
Pilot tone transmitting means for transmitting a pilot tone to the data receiving device;
Channel information receiving means for receiving channel information which is information of a frequency band in which there is no notch returned from the data receiving device in response to the pilot tone;
Transmission channel setting means for setting a transmission channel to be used in the communication based on the channel information;
First data processing means for performing processing of arranging original data in the transmission channel to be transmission data;
A data transmission device for in-vehicle power line communication, comprising: data transmission means for transmitting the transmission data via a power line. In the data receiving device for in-vehicle power line communication that communicates with the data transmitting device of the in-vehicle device of the vehicle through the power line of the vehicle,
Pilot tone receiving means for receiving a pilot tone from the data transmitting device;
Notch detection means for detecting a notch existing in a frequency band used for the communication according to a reception state of the pilot tone;
A transmission channel selection means for selecting a transmission channel to be used when performing the communication while avoiding the frequency band in which the detected notch exists,
Channel information transmitting means for transmitting the selected transmission channel information as channel information via a power line;
Data receiving means for receiving transmission data transmitted from the data transmission apparatus by arranging original data in the transmission channel;
And a second data processing means for restoring the original data from the received transmission data. A data receiving apparatus for in-vehicle power line communication, comprising: In the in-vehicle power line communication method for performing communication via the power line of the vehicle between the data transmitting device and the data receiving device of a plurality of in-vehicle devices of the vehicle,
A first step of transmitting a pilot tone from the data transmitting apparatus to the data receiving apparatus;
A second step in which the data receiving apparatus detects a frequency band in which a notch exists in a frequency band used for the communication based on the received pilot tone;
A third step in which the data receiving device transmits information on a frequency band in which the detected notch exists as channel information to the data transmitting device;
A fourth step in which the data transmitting device sets a channel of a frequency band in which no notch exists based on the transmitted channel information as a transmission channel used for the communication;
The data transmission device includes a fifth step of transmitting the transmission data to the data receiving device after arranging the original data to be transmitted in the transmission channel to obtain the transmission data. A vehicle-mounted power line communication method. In the first step, the data transmitting apparatus transmits the pilot tone by continuously changing the frequency,
5. The on-vehicle power line communication method according to claim 4, wherein in the second step, a frequency band in which the notch exists is detected based on the continuously changing pilot tone. 6. The frequency band in which a notch does not exist is detected at a predetermined time interval even during the communication, and the transmission channel is changed to a channel in a frequency band in which a notch does not exist. The in-vehicle power line communication method described. In an in-vehicle power line communication program for performing communication via a power line of the vehicle between a data transmitting device and a data receiving device of a plurality of in-vehicle devices of the vehicle,
A first step of transmitting a pilot tone from the data transmitting apparatus to the data receiving apparatus;
A second step in which the data receiving apparatus detects a frequency band in which a notch exists in a frequency band used for the communication based on the received pilot tone;
A third step in which the data receiving device transmits information on a frequency band in which the detected notch exists as channel information to the data transmitting device;
A fourth step in which the data transmitting device sets a channel of a frequency band in which no notch exists based on the transmitted channel information as a transmission channel used for the communication;
The data transmission apparatus causes the computer to execute a fifth step of transmitting the transmission data to the data reception apparatus after arranging the original data to be transmitted in the transmission channel to be transmission data. In-vehicle power line communication program.

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