JP2008258875A - Information communication network in vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information communication network in vehicle capable of taking countermeasures against a disturbance wave while reducing a transmission line without using a GW (gateway). <P>SOLUTION: A transmitter provided in accordance with a communication apparatus belonging to a body system network modulates transmission information in a frequency band W1 of the body system network and then transmits the transmission information to a transmission path, and a receiver provided in accordance with the communication apparatus belonging to the body system network demodulates the reception information modulated to the frequency band W1 corresponding to the body system network from a transmission path and then receives the reception information. Similarly, respective transmitters provided in accordance with communication apparatuses belonging to a chassis system, an information system and a security system modulate the transmission information in frequency bands W3 to W5 of the chassis system, the information system and the security system and then transmit the transmission information, and respective receivers provided in accordance with the communication apparatuses belonging to the chassis system, the information system and the security system demodulate reception information modulated to the frequency bands W3 to W5 of the chassis system, the information system and the security system. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an in-vehicle information communication network, and more particularly to an in-vehicle information communication network mounted on a vehicle.

  Generally, devices in a vehicle are classified into “chassis network”, “body network”, “information network”, and “safety network”. The chassis network is composed of devices that control the engine, the mission, the steering wheel, and the devices associated therewith. The body network is composed of devices that control switches around the in-dash panel and the door panel and devices around the handle.

  The safety network is composed of devices that control the airbag sensor and the ignition device. The information system network is composed of devices that perform control such as car navigation and audio visual. The devices constituting each network communicate with each other using different communication protocols.

  By the way, with the recent improvement in vehicle performance, many ECUs (electronic control devices) are installed in the vehicle, and the amount of electric wires connecting them is enlarged, and there are various devices such as device installation space, wiring space, and weight. There is a problem.

  For example, in the in-dash panel in front of the driver's seat, many devices such as meters, information devices, air conditioners, airbags, and driving devices are concentrated, and there are many wires and ECUs that are connected to them. It is a crowded state.

  Thus, as a method of reducing the number of transmission paths by connecting the networks with a common transmission path, it has been proposed to connect the networks with a gateway (GW) that is a protocol converter (Patent Document 1). However, in the method described in Patent Document 1 described above, it is necessary to use GW, and there is a problem in cost.

  In addition, in devices connected via each network, there are many devices that are sources of interference waves such as electric motors, generators, ignition devices, etc., and these interference waves are superimposed on the metal wire that is the transmission line, There has been a problem that information flowing on the track is distorted or has an adverse effect such as wrapping around communication equipment.

  As measures against these interference waves, there are methods such as using a strong anti-interference wave on the communication line, installing a device that removes the interference wave from the line, or installing an interference wave countermeasure function for each in-vehicle device. Although they were compatible, there are problems in terms of cost.

Patent Document 2 describes a technique for flowing a baseband signal and a modulated signal through a common transmission line as a new attempt for an interference wave. However, with the technique described in Patent Document 2 described above, it is not possible to connect the networks via a common transmission path.
JP 2004-266664 A JP 2004-336482 A

  Therefore, the present invention pays attention to the above-described problems, and an object thereof is to provide an in-vehicle information communication network capable of taking measures against jamming waves while reducing transmission lines without using a GW. .

  The invention according to claim 1, which has been made to solve the above-described problems, includes a plurality of first communication devices mounted on a vehicle and communicating with each other, and a plurality of communications in which the plurality of first communication devices are classified for each communication protocol. A vehicle communication system having a network and a transmission path that connects the plurality of first communication devices to each other, provided corresponding to each first communication device so as not to interfere with each other in communication bands A transmitter that transmits the transmission information to the transmission path after modulating the transmission information of the first communication device to a frequency band corresponding to the communication network of the corresponding first communication device among the plurality of divided frequency bands; Reception from the transmission path provided corresponding to the first communication device and modulated in the frequency band corresponding to the communication network of the corresponding first communication device among the plurality of frequency bands A receiver for receiving after demodulating the broadcast resides in-vehicle information and communication network, characterized in that it comprises a.

  According to a second aspect of the present invention, the first communication device is connected to a plurality of second communication devices and can communicate with the second communication device, and the first communication device is connected to the second communication device. The information according to claim 1, wherein when the information is received from the device, the information is transmitted by the transmitter, and the received information received from the receiver is transmitted to the second communication device. In-vehicle information communication network.

  According to a third aspect of the present invention, the transmitter modulates and transmits transmission information in two or more frequency bands corresponding to the communication network of the first communication device among the plurality of frequency bands. The receiver demodulates reception information modulated respectively at two or more frequencies according to the communication network of the first communication device among the plurality of frequency bands, and The in-vehicle information communication network according to claim 1, wherein the first communication device causes the transmitter to modulate the same transmission information at two or more frequencies.

  According to a fourth aspect of the invention, the transmitter modulates and transmits transmission information in two or more frequency bands corresponding to the communication network of the first communication device among the plurality of frequency bands. The receiver demodulates reception information modulated at two or more frequencies corresponding to the communication network of the corresponding first communication device among the plurality of frequency bands, and The in-vehicle information communication network according to claim 1, wherein the first communication device causes the transmitter to modulate transmission information different from each other at two or more frequencies.

  As described above, according to the first aspect of the present invention, the transmitter provided corresponding to each first communication device is divided among the plurality of frequency bands obtained by dividing the communication band so as not to overlap each other. A plurality of receivers provided corresponding to each first communication device, wherein transmission information of the first communication device is modulated in a frequency band corresponding to the communication network of the corresponding first communication device and then transmitted to the transmission path. The received information from the transmission path modulated to the frequency band corresponding to the communication network of the corresponding first communication device is demodulated and received. Thereby, communication can be performed at different frequencies for each communication network, and a common transmission path can be used in a plurality of communication networks. Therefore, transmission lines can be reduced without using GW. In addition, if the frequency band of the interference wave that is known in advance as the communication band is not used, countermeasures against the interference wave can be taken.

  According to the second aspect of the present invention, the first communication device is connected to the plurality of second communication devices and can communicate with the second communication device, and the first communication device is connected to the second communication device. When the information is received, the information is transmitted by the transmitter, and the received information received from the receiver is transmitted to the second communication device. Therefore, the transmitter modulates the information from the plurality of second communication devices collectively. Therefore, the configuration can be simplified.

  According to the third aspect of the present invention, the first communication device causes the transmitter to modulate the same transmission information at two or more frequencies, so that the transmission information modulated by one of the two or more frequency bands is affected by the interference wave. Even if it cannot be received due to, for example, transmission information modulated at other frequencies in two or more frequency bands can be received, a backup function can be provided to increase the reliability of information transmission.

  According to the fourth aspect of the invention, since the transmitter modulates different pieces of transmission information at two or more frequencies, the transmission speed can be increased.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a vehicle communication system of the present invention. As shown in the figure, the communication system for vehicles includes communication devices 1-1 to 1-22, 2-1 to 2- as a plurality of first communication devices that are arranged in each part of the vehicle 100 and communicate with each other. 10, 3-1 to 3-6, 4-1 to 4-7. The plurality of communication devices 1-1 to 1-22, 2-1 to 2-10, 3-1 to 3-6, and 4-1 to 4-7 are each a body network 1 as a communication network for each communication protocol. , Chassis network 2, information network 3, and safety network 4.

  Communication devices 1-1 to 1-22, 2-1 to 2-10, 3-1 to 3-6, and 4 constituting the body network 1, chassis network 2, information network 3, and safety network 4 -1 to 4-7 are shown in Table 1 below.

  As shown in Table 1, the body network 1 includes a switch 1-1 as a driver's seat peripheral device 5, a wiper 1-2, a winker 1-3, a meter 1-4, a light 1-5, and a front lighting. Headlight 1-6 as class 6, blinker lamp 1-7, air conditioner 1-8 as in-dash panel device 7, electric door mirror 1-9 provided on front door 8, power window 1-10, concentrated door The lock 1-11, the power seat 1-12 provided on the front seat 9, the electric slide door 1-13 provided on the rear door 10, the power window 1-14, the central door lock 1-15, and the rear seat 11 Provided power seat 1-16, air conditioner 1-17, brake lamp 1-18 as rear lighting 12 and blinker lamp 1-19 , Map lamp 1-20 as a vehicle in lighting such 13, sunroof 1-21, and a room lamp 22..

  The chassis network 2 includes a handle 2-1 as a driver's seat peripheral device 5, an engine 2-2 as a power device 14, a mission 2-3, a compressor 2-4, and an accelerator as a power control device 15. It consists of a pedal 2-5, a brake pedal 2-6, a brake 2-7 as a front wheel device 16, a vehicle speed 2-8, a brake 2-9 as a rear wheel device 17, and a vehicle speed 2-10. .

  The information network 3 includes a car navigation 3-1 as the in-dash panel device 7, an audio 3-2, a speaker 3-3 provided on the front door 8, and a rear seat display 3-provided on the front seat 9. 4, speaker 3-5, and speaker 3-6 provided on rear door 10.

  The safety network 4 includes an airbag 4-1 as a driver's seat peripheral device 5, an ABS 4-2 as a power device 14, an airbag 4-3 provided on the front door 8, and a front seat 9. From the provided electric take-up belt 4-4, the airbag 4-5 provided in the rear door 10, the electric take-up belt 4-6 provided in the rear seat 11, and the G sensor / collision sensor 4-7 It is configured.

  The communication devices 1-1 to 1-22, 2-1 to 2-10, 3-1 to 3-6, and 4-1 to 4-7 are connected to each other via a transmission line L. The transmission line L is branched from the common basic transmission line L1 and the basic transmission line L1 (= transmission line), and communication devices 1-1 to 1-22, 2-1 to 2-10, 3-1 to 3-6, and 4-1 to 4-7 are configured from terminal transmission lines L2 (= transmission lines). As a method for joining the backbone transmission line L1 and the terminal transmission line L2, a method such as resistance distribution is conceivable, but there is no limitation including other methods.

  The communication devices 1-1 to 1-22, 2-1 to 2-10, 3-1 to 3-6, and 4-1 to 4-7 described above communicate with the transmission / reception device 20 as illustrated in FIG. Devices 1-1 to 1-22, 2-1 to 2-10, 3-1 to 3-6, 4-1 to 4-7, and a μCOM 29 for controlling the transmission / reception device 20. As shown in the figure, the transceiver 20 includes a transceiver 21, directional couplers 22H and 22L, transmission waveform shaping circuits 23H and 23L, reception waveform shaping circuits 24H and 24L, modulation circuits 25H and 25L, demodulation circuits 26H and 26L. Directional couplers 27H and 27L and band pass filters (BPF) 28H and 28L.

  The transceiver 21 transmits and receives Hi and Low differential signals as transmission information and reception information. The directional couplers 22H and 22L output differential Hi signals and differential Low signals as transmission information output from the Hi and Low of the transceiver 21 to the transmission waveform shaping circuit 23H and the transmission waveform shaping circuit 23L, and receive them. This is a device that outputs a differential Hi signal and a differential Low signal as reception information output from the waveform shaping circuits 24H and 24L to the transceiver 21.

  The transmission waveform shaping circuits 23H and 23L are circuits for shaping the differential Hi signal and the differential Low signal output from the directional couplers 22H and 22L into waveforms suitable for the modulation circuits 25H and 25L. The modulation circuits 25H and 25L are circuits that modulate the differential Hi signal and the differential Low signal from the transceiver 21 to a predetermined frequency band to be described later. Note that, as a modulation method of the modulation circuits 25H and 25L, for example, OFDM modulation robust to an interference wave is conceivable. The subcarrier modulation schemes for the networks 1 to 4 may all be the same. For example, QAM modulation is used for the networks 1 to 4 where high communication speed is required, and BPSK modulation is used for the networks 1 to 4 where high reliability is required. May be used.

  On the other hand, the reception waveform shaping circuits 24H and 24L are circuits that shape the differential Hi signal and the differential Low signal received from the terminal transmission line L2 into waveforms suitable for the transceiver 21. The demodulating circuits 26H and 26L are circuits that demodulate a differential Hi signal and a differential Low signal received from the end transmission line L2 and modulated in a predetermined frequency band to be described later.

  The directional couplers 27H and 27L output differential Hi signals and differential Low signals as transmission information modulated by the modulation circuit 25H to the BPFs 28H and 28L, and as reception information flowing into the end transmission line L2. This is a device that outputs a differential Hi signal and a differential Low signal to the demodulation circuits 26H and 26L. The BPFs 28H and 28L are for removing extra waveforms outside the predetermined frequency band. The transceiver 21 is controlled by the μCOM 29.

  The operation of the transmission / reception apparatus 20 configured as described above will be described below. When a differential Hi signal and a differential Low signal are output as transmission information from the transceiver 21, the differential Hi signal and the differential Low signal are input to the transmission waveform shaping circuits 23H and 23L by the directional couplers 22H and 22L. . Then, the differential Hi signal and the differential Low signal are shaped into shapes suitable for the modulation circuits 25H and 25L of the next stage by the transmission waveform shaping circuits 23H and 23L. The modulation circuits 25H and 25L modulate the differential Hi signal and the differential Low signal into the predetermined frequency band, and then output them to the directional couplers 27H and 27L.

  The directional couplers 27H and 27L output the differential Hi signal and differential Low signal from the modulation circuits 25H and 25L to the BPFs 28H and 28L. The BPFs 28H and 28L remove an extra waveform outside the predetermined frequency band of the differential Hi signal and the differential Low signal, and output the signal to the terminal transmission line L2 composed of a twisted pair electric wire.

  On the other hand, the differential Hi signal and the differential Low signal that have flowed into the BPFs 28H and 28L from the end transmission line L2 are removed by the BPFs 28H and 28L from unnecessary waveforms outside the predetermined frequency band, and the directional coupler 27H. , 27L and input to the demodulation circuits 26H, 26L. The demodulating circuits 26H and 26L demodulate the differential Hi signal and the differential Low signal modulated in the predetermined frequency band and output them to the reception waveform shaping circuits 24H and 24L. The demodulated differential Hi signal and differential Low signal are shaped into waveforms suitable for the transceiver 21 by the reception waveform shaping circuits 24H and 24L, and then output to the transceiver 21 through the directional couplers 22H and 22L. .

  In the present embodiment, the transceiver 21 using a differential signal is exemplified as a transmission / reception device, but the present invention is not limited to this. As the transmission / reception apparatus, other systems may be used as long as they can modulate transmission information and transmit it to the transmission line L, or demodulate the modulated reception signal.

  Next, the modulation frequencies of the modulation circuits 25H and 25L and the demodulation frequencies of the demodulation circuits 26H and 26L will be described with reference to FIG. As shown in FIG. 3, the communication band (several hundred MHz to several GHz) is divided in advance into a plurality of frequency bands W1 to W5 having F0 to F5 as the center frequency so as not to overlap each other. In the example shown in FIG. 3, the frequency band W1 is allocated to the body network 1, the frequency band W3 is allocated to the chassis network 2, the frequency band W4 is allocated to the information network 3, and the frequency band W5 is allocated to the safety network 4. Yes.

  As shown in FIG. 3, the frequency bands allocated to the networks 1 to 5 are FM, AM frequency band, portable frequency band, TV frequency band, ISM band, and other interference wave generation bands W0 observed in the vehicle. , Allocated to avoid W2.

  As shown in FIG. 3, in the present embodiment, from the viewpoint of reliability and transmission speed, the low-reliability and low-speed communication body network 1 is allocated to the frequency band W1 sandwiched between the interference wave generation bands W0 and W3. It is. The chassis network 2 that requires high reliability and a certain communication speed is assigned the frequency band W2, and the information network 3 that requires high-speed transmission is assigned the high frequency band W4. The frequency band allocation shown in FIG. 3 is an example, and other allocations may be used.

  The modulation circuits 25H and 25L in the transmission / reception device 20 include communication devices 1-1 to 1-22, 2-1 to 2-10, and 3-1 to 3 included in the plurality of frequency bands W0 to W5. The transmission information is modulated into frequency bands W0 to W5 corresponding to the networks 1 to 4 of −6, 4-1 to 4-7. On the other hand, the demodulation circuits 26H and 26L in the transmission / reception apparatus 20 include built-in communication devices 1-1 to 1-22, 2-1 to 2-10, 3-1 to 3-6, and 4-1 to 4-7. The received information from the terminal transmission line L2 modulated in the frequency bands W0 to W5 corresponding to the networks 1 to 4 is demodulated.

  More specifically, the modulation circuits 25H and 25L of the transmission / reception device 20 built in the communication devices 1-1 to 22 constituting the body network 1 modulate the transmission information into the frequency band W1, and the demodulation circuits 26H and 26L. Demodulates the reception information modulated in the frequency band W1. The modulation circuits 25H and 25L of the transmission / reception device 20 incorporated in the communication devices 2-1 to 10 constituting the chassis network 2 modulate transmission information into the frequency band W3, and the demodulation circuits 26H and 26L operate in the frequency band W3. Demodulate the modulated received information.

  The modulation circuits 25H and 25L of the transmission / reception device 20 incorporated in the communication devices 3-1 to 6 constituting the information network 3 modulate the transmission information into the frequency band W4, and the demodulation circuits 26H and 26L operate in the frequency band W4. Demodulate the modulated received information. The modulation circuits 25H and 25L of the transmission / reception device 20 incorporated in the communication devices 4-1 to 7 constituting the safety network 4 modulate transmission information into the frequency band W5, and the demodulation circuits 26H and 26L operate in the frequency band W5. Demodulate the modulated received information.

  As is clear from the above, the transmission / reception device 20 includes the corresponding communication devices 1-1 to 1-22, 2-1 to 2-10, 3-1 to 3-6, among the plurality of frequency bands W0 to W5. The transmission information can be modulated and transmitted to the terminal transmission line L2 in the frequency bands W0 to W5 corresponding to the networks 1 to 4 of the 4-1 to 4-7, and the corresponding communication devices 1-1 to 1-22, 2- 1 to 2-10, 3-1 to 3-6, and 4-1 to 4-7, demodulating received information from the end transmission line L2 modulated in the frequency bands W0 to W5 corresponding to the networks 1 to 4 Can be received. Therefore, it can be understood that the transmitting / receiving device 20 corresponds to a transmitter and a receiver in the claims.

  Next, the operation of the in-vehicle information communication network configured as described above will be described. Since the transmission / reception operations between the networks 1 to 5 are the same as each other, here, description will be made on behalf of the transmission / reception of the switch operation signal in the body network 1.

  First, for example, when a switch operation signal (transmission information) to be transmitted to the power window 1-10 is generated in the μCOM 29 in the switch 1-1, the switch 1-1, which is a transmission source address, is transmitted to the switch operation signal. The address and the address of the power window 1-10 which is the transmission destination address are attached and output to the transmission / reception device 20. The transmission / reception device 20 modulates the switch operation signal to the frequency band f1 corresponding to the body network 1 and outputs the modulated signal to the terminal transmission line L2.

  The switch operation signal that has flowed to the terminal transmission line L2 is transmitted to the transmission / reception device 20 built in the other communication devices 1-2 to 1-22 that constitute the body network 1 via the backbone transmission line L1 and the terminal transmission line L2. Received. The switch operation signal passes through the BPFs 28H and 28L of the transmission / reception device 20 incorporated in the communication devices 2-1 to 2-10, 3-1 to 3-6, and 4-1 to 4-7 other than the body network 1. Therefore, the switch operation signal built in the communication devices 2-1 to 2-10, 3-1 to 3-6, and 4-1 to 4-7 other than the body network 1 cannot receive the switch operation signal. . The switch operation signal is input to the transmission / reception device 20 through the BPFs 28H and 28L of the transmission / reception device 20 incorporated in the communication devices 1-2 to 1-22 constituting the body network 1.

  The transmission / reception device 20 incorporated in the other communication devices 1-2 to 1-22 constituting the body network 1 demodulates the switch operation signal modulated in the frequency band f1 and outputs it to the μCOM 29. The μCOM 29 receives the switch operation signal received by the transmission / reception device 20 if the transmission destination address is addressed to itself. Here, the μCOM 29 in the power window 1-10 confirms that it is addressed to itself, receives a switch operation signal, and controls the power window 1-10 according to the switch operation signal.

  The transmission / reception of the accelerator operation signal of the engine 2-2 performed in the chassis system network 2 and the transmission / reception of the audio signal performed in the information system network 3 are performed in the same manner.

  According to the in-vehicle information communication network described above, the communication devices 1-1 to 1-22, 2-1 to 2-10, 3-1 to 3-6, and 4-1 to 4-7 are provided. Of the plurality of frequency bands W0 to W5, the corresponding communication devices 1-1 to 1-22, 2-1 to 2-10, 3-1 to 3-6, 4-1 to 4 Of communication devices 1-1 to 1-22, 2-1 to 2-10, 3-1 to 3-6, and 4-1 to 4-7 in frequency bands f0 to f5 corresponding to the networks 1 to 4 of -7. The transmission information is modulated and transmitted to the terminal transmission line L2, and the corresponding communication devices 1-1 to 1-22, 2-1 to 2-10, and 3-1 to 3 out of the plurality of frequency bands W0 to W5. -6, 4-1 to 4-7 demodulated received information from the end transmission line L2 modulated in the frequency band W0 to W5 corresponding to the networks 1 to 4 It is received. Thereby, communication can be performed in different frequency bands W0 to W5 for each of the networks 1 to 4, and a common backbone transmission line L1 can be used in the plurality of networks 1 to 4. Therefore, transmission lines can be reduced without using GW. In addition, if the generation frequency bands W0 and W2 of interference waves that are known in advance as communication bands are not used, countermeasures against interference waves can be taken.

  In the above-described embodiment, transmission / reception is performed for each of the communication devices 1-1 to 1-22, 2-1 to 2-10, 3-1 to 3-6, and 4-1 to 4-7. Although the apparatus 20 is provided, the present invention is not limited to this. For example, as shown in FIG. 4, if the brake lamp 1-18 and the blinker lamp 1-19 are installed in the vicinity of the vehicle, the brake lamp 1-18 and the blinker lamp 1-19 are connected. It is conceivable to provide a communication device 1-23 that can communicate with the brake lamp 1-18 and the blinker lamp 1-19.

  The brake lamp 1-18 and the blinker lamp 1-19 do not modulate transmission information or reception information. The communication device 1-23 constitutes the body network 1 and performs communication using the protocol of the body network 1. In the communication device 1-23, the transmission / reception device 20 and the μCOM 29 are incorporated. When the μCOM 29 in the communication device 1-23 receives information from the brake lamp 1-18 and the blinker lamp 1-19, the μCOM 29 collectively outputs the information to the transmission / reception device 20 to the frequency band W1 corresponding to the body system network 1. Modulate and transmit to the end transmission line L2. On the other hand, when receiving the received information from the terminal transmission path L2, the communication device 1-23 collectively demodulates the data by the transmitting / receiving device 20, and transmits the received information to the brake lamp 1-18 and the blinker lamp 1-19, which are the transmission destinations of the received information. In this case, the communication device 1-23 corresponds to the first communication device, the brake lamp 1-18, and the blinker lamp 1-19 correspond to the second communication device.

  According to the in-vehicle information communication network, the communication device 1-23 is connected to the brake lamp 1-18 and the blinker lamp 1-19 and can communicate with the brake lamp 1-18 and the blinker lamp 1-19. When the communication device 1-23 receives information from the brake lamp 1-18 and the blinker lamp 1-19, the communication device 1-23 transmits the information by the transmission / reception device 20, and receives the reception information received from the transmission / reception device 20 as the brake lamp 1. -18, since it is transmitted to the blinker lamp 1-19, the transmission / reception device 20 in the communication device 1-23 can collectively modulate and demodulate information from the brake lamp 1-18 and the blinker lamp 1-19. , The configuration can be simplified.

  Further, according to the embodiment described above, each of the networks 1 to 4 is assigned only one frequency band, but the present invention is not limited to this. For example, two or more frequency bands may be assigned to one network 1 to 4. In this case, the transmission / reception device 20 includes two or more modulation circuits 25H and 25L, modulates transmission information to two or more frequencies, respectively, and includes demodulation circuits 26H and 26L to receive signals modulated to two or more frequencies. Demodulate information. Then, the μCOM 29 in the communication devices 1-1 to 1-22, 2-1 to 2-10, 3-1 to 3-6, and 4-1 to 4-7 sends the same transmission information to the transmission / reception device 20, for example. If modulation is performed at more than one frequency, transmission information modulated at another frequency can be received even if transmission information modulated at one of a plurality of frequency bands cannot be received due to the influence of interfering radio waves Therefore, a backup function can be provided, and the reliability of information transmission can be increased.

  In addition, the μCOM 29 in the communication devices 1-1 to 1-22, 2-1 to 2-10, 3-1 to 3-6, and 4-1 to 4-7 sends, for example, two pieces of transmission information different to the transmission / reception device 20. If modulation is performed at two or more frequencies, the transmission speed can be increased.

  In the above-described embodiment, the transmission / reception device 20 is incorporated in each communication device 1-1 to 1-22, 2-1 to 2-10, 3-1 to 3-6, and 4-1 to 4-7. However, the present invention is not limited to this. The transmission / reception device 20 may be provided outside each communication device 1-1 to 1-22, 2-1 to 2-10, 3-1 to 3-6, and 4-1 to 4-7.

  In the above-described embodiment, the transmission / reception devices 20 in the communication devices 1-1 to 1-22, 2-1 to 2-10, 3-1 to 3-6, and 4-1 to 4-7 are as follows. Although both the transmitter and the receiver were included, the present invention is not limited to this. When each communication device 1-1 to 1-22, 2-1 to 2-10, 3-1 to 3-6, and 4-1 to 4-7 performs only transmission, it is sufficient to have only a transmitter. When receiving only, it is sufficient to have only the receiver.

  Further, the above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications can be made without departing from the scope of the present invention.

It is a block diagram which shows one Embodiment of the in-vehicle information communication network of this invention. It is a block diagram which shows the structure of the transmission / reception apparatus incorporated in the communication apparatus which comprises the in-vehicle information communication network of FIG. 3 is a graph for explaining a modulation frequency of the modulation circuit of FIG. 2 and a demodulation frequency of the demodulation circuit. It is a block diagram which shows one Embodiment of the in-vehicle information communication network in other embodiment.

Explanation of symbols

1 Body network (communication network)
1-1-21 Communication device (first communication device)
2 Chassis network (communication network)
2-1-10 Communication equipment (first communication equipment)
3 Information network (communication network)
3-1-6 Communication equipment (first communication equipment)
4 Safety network (communication network)
4-1-7 Communication equipment (first communication equipment)
20 Transmitter / receiver (transmitter, receiver)
L1 Core transmission line (transmission line)
L2 Terminal transmission line (transmission line)

Claims (4)

A plurality of first communication devices that are mounted on a vehicle and communicate with each other, a plurality of communication networks that classify the plurality of first communication devices for each communication protocol, and a transmission path that connects the plurality of first communication devices to each other A vehicle communication system comprising:
Of the plurality of frequency bands provided corresponding to the first communication devices and divided so that the communication bands do not interfere with each other, the first communication device has a frequency band corresponding to the communication network of the corresponding first communication device. A transmitter for transmitting the transmission information to the transmission line after modulating the transmission information of the communication device;
Provided corresponding to each first communication device, and demodulating received information from the transmission path modulated in a frequency band corresponding to the communication network of the corresponding first communication device among the plurality of frequency bands An in-vehicle information communication network characterized by comprising: The first communication device is connected to a plurality of second communication devices and is capable of communicating with the second communication device; and
When the first communication device receives information from the second communication device, the information is transmitted by the transmitter, and the reception information received from the receiver is transmitted to the second communication device. The in-vehicle information communication network according to claim 1. The transmitter modulates and transmits transmission information in each of two or more frequency bands corresponding to the communication network of the corresponding first communication device among the plurality of frequency bands,
The receiver demodulates reception information modulated respectively at two or more frequencies according to the communication network of the first communication device among the plurality of frequency bands; and
The in-vehicle information communication network according to claim 1 or 2, wherein the first communication device causes the transmitter to modulate the same transmission information at two or more frequencies. The transmitter modulates and transmits transmission information in each of two or more frequency bands corresponding to the communication network of the corresponding first communication device among the plurality of frequency bands,
The receiver demodulates reception information modulated respectively at two or more frequencies according to the communication network of the corresponding first communication device among the plurality of frequency bands; and
The in-vehicle information communication network according to claim 1 or 2, wherein the first communication device causes the transmitter to modulate different transmission information at two or more frequencies.

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