JP2014162349A - Intra-vehicle wireless communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intra-vehicle wireless communication system capable of performing wireless communication across a partition.SOLUTION: An intra-vehicle wireless communication system 100 includes: a switch wireless communication machine 110 that is disposed in a vehicle whose wireless communication area is divided into three parts by partitions 11 and 12 constituting barrier against wireless communication, is placed in a wireless communication area 21 and is connected to a combination switch; actuator wireless communication machines 120 and 130 that are respectively placed in wireless communication areas 22 and 23 and are respectively connected to actuators of a combination lamp; and wireless communication relay devices 140 and 150 for relaying communication between the wireless communication areas 21 and 22, and between the wireless communication areas 21 and 23. Further, individual reception antennas are arranged so that polarization planes of radio waves used for communication face each other in the adjacent two of the wireless communication areas.

Description

  The present invention relates to an in-vehicle wireless communication system that operates an electric load mounted on a vehicle using wireless communication.

  In recent years, electric loads mounted on vehicles tend to increase, and signal wires (wire harnesses) for operating the electric loads are also greatly increasing. For this reason, there are problems such as difficulty in securing the wiring space for the signal lines, and problems that contradict the needs for weight reduction of the vehicle. Therefore, in order to solve such a problem, development of an in-vehicle wireless communication system in which an operation signal for operating each electric load, failure information, and the like are transmitted by wireless communication is underway.

  As a conventional system using wireless communication, for example, there is an in-vehicle control system disclosed in Patent Document 1. In this in-vehicle control system, in order to reduce the thickness of overhead modules such as ceiling lights and electric sunroofs provided in the vehicle interior, the respective operation switches are installed on the instrument panel. Then, wireless communication is performed between the instrument panel and the overhead module. As a result, the switch circuit or the like can be removed from the overhead module to reduce the thickness, and the wire harness or the like can be eliminated by using wireless communication.

JP 2005-75267 A

  However, when an electric load is operated using wireless communication, there is a partition that blocks radio waves between the wireless communication device that transmits the switch signal and the wireless communication device that is connected to the actuator that operates the electric load. If it exists, there is a possibility that communication between the wireless communication device on the switch side and the wireless communication device on the actuator side cannot be performed. In addition, if the radio wave intensity is increased so that communication is possible, radio waves may leak out of the vehicle and interfere with other wireless communications, and power consumption increases to increase the radio wave intensity. .

  In particular, the electrical load mounted on the vehicle is mainly provided with a switch for operating the electrical load, while the actuator for operating each electrical load is installed in an engine room, a trunk room, or the like. . Since a metal partition is provided between the passenger compartment and the engine room, trunk room, etc., blocking the radio waves by the partition is a major problem in enabling electric loads to be operated using wireless communication. Yes.

  The present invention has been made to solve these problems, and an object thereof is to provide an in-vehicle wireless communication system capable of wireless communication with a partition wall interposed therebetween.

  A first aspect of the in-vehicle wireless communication system of the present invention is an in-vehicle wireless communication system that is mounted on a vehicle that includes one or more partition walls that serve as a barrier for wireless communication and that has an in-vehicle wireless communication area divided into two or more. A switch wireless communication device disposed in each wireless communication area in which one or more switches are disposed and connected to the switch; and a wireless communication area disposed in each wireless communication area in which one or more actuators are disposed. A connected actuator wireless communication device, and one or more wireless communication repeaters that relay communication between two adjacent wireless communication areas divided by the partition wall, each of the switch wireless communication devices being 1 It has two transmitting and receiving antennas and transmits a communication signal by a broadcast method or a unicast method. The communication signal is transmitted by a broadcast method or a unicast method with two transmission / reception antennas, and the wireless communication repeater has a transmission / reception antenna in each of the two adjacent wireless communication areas. The transmission / reception antenna is arranged so that a radio wave polarization plane of the communication signal is orthogonal to each other between the two adjacent wireless communication areas.

  According to another aspect of the in-vehicle wireless communication system of the present invention, when there are two or more partition walls and two or more wireless communication repeaters, communication contents of communication signals broadcast by the wireless communication repeaters are different. It is characterized by being.

  According to another aspect of the in-vehicle wireless communication system of the present invention, when there are two or more partition walls and two or more wireless communication repeaters, the communication contents of the communication signals broadcast by each of the wireless communication repeaters are the same. It is characterized by being.

  In another aspect of the in-vehicle wireless communication system according to the present invention, when any one of the two or more wireless communication repeaters fails, the switch wireless transmits a communication signal to the failed wireless communication repeater in a unicast manner. The communication device and / or the actuator wireless communication device transmits a communication signal having failure information to another wireless communication repeater with a higher radio field intensity than usual by a unicast method, and receives the communication signal having the failure information. The another wireless communication repeater broadcasts a communication signal with a higher radio wave intensity than usual.

  In another aspect of the in-vehicle wireless communication system of the present invention, the frequency channel of the communication signal is the same in all of the two or more wireless communication areas.

  Another aspect of the in-vehicle wireless communication system of the present invention is characterized in that the communication signal is modulated and restored by spread spectrum.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the in-vehicle wireless communication system which can perform radio | wireless communication on both sides of a partition.

It is a perspective view which shows the structure of the in-vehicle wireless communication system of 1st Embodiment of this invention. It is a block diagram which shows the structure of the combination switch radio | wireless communication apparatus with which the in-vehicle radio | wireless communications system of 1st Embodiment was equipped. It is a block diagram which shows the structure of the front actuator radio | wireless communication apparatus with which the in-vehicle radio | wireless communications system of 1st Embodiment was equipped. It is a block diagram which shows the structure of the radio | wireless communication repeater with which the in-vehicle radio | wireless communications system of 1st Embodiment was equipped. It is a table | surface which shows the signal transmission system in LAN of each radio | wireless communication area. It is a table | surface which shows the communication content of the radio | wireless communication signal in the in-vehicle radio | wireless communications system of 1st Embodiment. It is a perspective view which shows the structure of the in-vehicle wireless communication system of 2nd Embodiment of this invention. It is a table | surface which shows the communication content of the radio | wireless communication signal in the in-vehicle radio | wireless communications system of 2nd Embodiment.

  An in-vehicle wireless communication system according to a preferred embodiment of the present invention will be described in detail with reference to the drawings. In addition, about each structural part which has the same function, the same code | symbol is attached | subjected and shown for simplification of illustration and description.

(First embodiment)
An in-vehicle wireless communication system according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a perspective view showing a configuration example of an in-vehicle wireless communication system 100 according to the present embodiment arranged in a vehicle. In FIG. 1, the interior of the vehicle 10 is divided into three wireless communication areas 21, 22, and 23 by two partition walls 11 and 12, and the in-vehicle wireless communication system 100 of this embodiment is mounted on such a vehicle 10. A configuration example is shown. Hereinafter, an example in which the in-vehicle wireless communication system 100 according to the present embodiment is mounted on the vehicle 10 divided into three communication areas by the two partition walls 11 and 12 will be described. The present invention can also be applied to a vehicle divided into two wireless communication areas by a partition wall.

  The partition walls 11 and 12 are formed of, for example, a metal plate that serves as a barrier for wireless communication. When the radio communication radio wave intensity is not sufficiently high, wireless communication cannot be performed directly between different wireless communication areas. Examples of the partition walls 11 and 12 include a partition wall provided between the engine room and the vehicle compartment of the vehicle 10 and a partition wall provided between the vehicle compartment and the trunk room. In this case, the wireless communication areas 21, 22, and 23 correspond to a vehicle compartment, an engine room, and a trunk room, respectively.

  Therefore, in the in-vehicle wireless communication system 100 of this embodiment, a LAN (Local Area Network) that performs communication only within the space is configured for each of the wireless communication areas 21, 22, and 23 partitioned by the partition walls 11 and 12. Hereinafter, the wireless communication networks in the wireless communication areas 21, 22, and 23 are referred to as LAN1, LAN2, and LAN3, respectively.

  Moreover, the partition walls 11 and 12 do not sufficiently shield the radio communication radio waves in each area, and the radio waves in each area may leak to the adjacent radio communication area. Therefore, in the in-vehicle wireless communication system 100 of the present embodiment, the planes of polarization of the radio waves are orthogonalized between adjacent wireless communication areas so that malfunctions do not occur even if radio waves leak into the adjacent wireless communication areas. That is, the direction of the radio transmission / reception antennas arranged in each radio communication area is adjusted so that the planes of polarization of radio waves are orthogonal between adjacent radio communication areas.

  Usually, a switch for operating a combination lamp, a wiper, and the like, which are integrated with a headlamp, a hazard lamp (turn lamp), and the like, are mainly provided in the passenger compartment (wireless communication area 21). On the other hand, an actuator for turning on / off or operating a combination lamp, a wiper or the like is provided in an engine room (wireless communication area 22) or a trunk room (wireless communication area 23).

  Therefore, in order to wirelessly transmit the operation information when the switch is operated in the vehicle interior to the corresponding actuator, it is necessary to transmit a communication signal to the wireless communication areas 22 and 23 through the partition wall from the wireless communication area 21. . Further, in order to wirelessly transmit failure information or the like from each actuator to a control device or the like in a vehicle interior or another actuator in another wireless communication area, it is necessary to similarly transmit a communication signal through the partition wall. Below, the structure of the in-vehicle wireless communication system 100 of this embodiment is demonstrated for a combination lamp as an example.

  The wireless communication area 21 corresponding to the passenger compartment is provided with a combination switch for requesting the operation of the combination lamp, and a combination switch wireless communication device 110 is provided for wirelessly communicating the operation information of the combination switch. . The wireless communication area 22 corresponding to the engine room is provided with an actuator for operating front combination lamps installed on the left and right of the front of the vehicle, and front actuator wireless communication for transmitting and receiving operation information of the actuator. Machines 120 are provided on the left and right in front of the vehicle. Furthermore, the wireless communication area 23 corresponding to the trunk room is provided with an actuator for operating rear combination lamps installed on the left and right of the rear surface of the vehicle, and a rear actuator wireless communication device for transmitting and receiving operation information of the actuator. 130 are provided on the left and right of the rear of the vehicle.

  The configurations of the combination switch wireless communication device 110, the front actuator wireless communication device 120, and the rear actuator wireless communication device 130 will be described below with reference to FIGS. 2 is a block diagram showing the configuration of the combination switch radio communication device 110, and FIG. 3 is a block diagram showing the configuration of the front actuator radio communication device 120. As shown in FIG. The rear actuator wireless communication device 130 has the same configuration as the front actuator wireless communication device 120 shown in FIG. The configuration of the front actuator wireless communication device 120 will be described below, but the same applies to the rear actuator wireless communication device 130.

  The combination switch wireless communication device 110 includes a combination switch 111, a switch determination circuit 112, an electronic control unit (ECU) 113, an IF unit 114, a data processing circuit 115, a transmission / reception circuit 116, and a transmission / reception antenna 117. When a passenger of the vehicle 10 operates the combination switch 111, the switch determination circuit 112 determines the operation state of the combination switch 111 and outputs the determination result to the ECU 113. The ECU 113 generates operation information for operating the target lamp based on the determination result of the switch determination circuit 112.

  For example, the IF unit 114 converts operation information of a predetermined number of bits input from the ECU 113 into a sequential signal and outputs the sequential signal to the data processing circuit 115. The data processing circuit 115 performs signal processing for superimposing operation information on radio waves, and the transmission / reception circuit 116 modulates a communication signal by spread spectrum. In the transmission / reception circuit 116, spectrum spreading can be performed by a direct spreading method, a frequency hopping method, or a hybrid method thereof, thereby improving confidentiality and anti-jamming wave resistance in wireless communication. The modulated communication signal is radiated from the transmission / reception antenna 117. On the other hand, after the communication signal received by the transmission / reception antenna 117 is restored by the transmission / reception circuit 116, the data processing circuit 115 and the IF unit 114 perform processing reverse to the above, and the reception data is output to the ECU 113.

  The front actuator wireless communication device 120 and the rear actuator wireless communication device 130 are respectively an actuator 121 (131) for operating the combination lamp, an actuator drive circuit 122 (132) for controlling the actuator 121 (131), and the received operation information. Are provided with an ECU 123 (133) for controlling the actuator drive circuit 122 (132), an IF unit 124 (134), a data processing circuit 125 (135), a transmission / reception circuit 126 (136), and a transmission / reception antenna 127 (137).

  In the in-vehicle wireless communication system 100 according to the present embodiment, wireless communication repeaters 140 and 150 are provided in the partition walls 11 and 12, respectively, in order to enable wireless communication between areas adjacent to the wireless communication areas 21, 22, and 23. ing. The wireless communication repeater 140 is used to relay wireless communication between the LAN 1 in the wireless communication area 21 and the LAN 2 in the wireless communication area 22, and the transmission / reception antenna 141 and the wireless communication area provided in the wireless communication area 21. 22 is provided with a transmission / reception antenna 149. The wireless communication repeater 150 is used to relay wireless communication between the LAN 1 in the wireless communication area 21 and the LAN 3 in the wireless communication area 23, and the wireless communication repeater 150 and the transmission / reception antenna 151 provided in the wireless communication area 21. A transmission / reception antenna 159 provided in the area 23 is provided.

  The configuration of the wireless communication repeaters 140 and 150 will be described below with reference to FIG. FIG. 4 is a block diagram illustrating a configuration of the wireless communication repeater 140. The wireless communication repeater 150 has the same configuration as the wireless communication repeater 140 shown in FIG. The configuration of the wireless communication repeater 140 will be described below, but the same applies to the wireless communication repeater 150.

  The wireless communication repeater 140 (150) includes two transmission / reception antennas 141 and 149 (151 and 159), two transmission / reception circuits 142 and 148 (152 and 158), and two data processing circuits 143 and 147 (153). 157), two IF units 144, 146 (154, 156), and an ECU 145 (155).

  In the in-vehicle wireless communication system 100, the transmission / reception antennas are arranged so that the planes of polarization of radio waves are orthogonal between adjacent wireless communication areas. That is, the transmission / reception antenna 117 of the combination switch wireless communication device 110 disposed in the wireless communication area 21 and the transmission / reception antenna 141 of the wireless communication repeater 140 are disposed so that the polarization planes are the same. On the other hand, the transmission / reception antenna 127 of the left and right front actuator wireless communication devices 120 arranged in the wireless communication area 22 and the transmission / reception antenna 149 of the wireless communication repeater 140 are orthogonal to the radio waves in the wireless communication area 21. To be arranged.

  Similarly, the transmission / reception antenna 117 of the combination switch wireless communication device 110 disposed in the wireless communication area 21 and the transmission / reception antenna 151 of the wireless communication repeater 150 are disposed to have the same polarization plane. On the other hand, the transmission / reception antenna 137 of the left and right rear actuator wireless communication devices 130 and the transmission / reception antenna 159 of the wireless communication repeater 150 arranged in the wireless communication area 23 are orthogonal to the radio waves in the wireless communication area 21. To be arranged.

  The in-vehicle wireless communication system 100 of the present embodiment uses two systems, a broadcast system and a unicast system, as signal transmission systems. A signal transmission method between each wireless communication device and the wireless communication repeater is shown in FIG. A plurality of actuators that are operated by the operation of the lamp switch 111 are mounted on the vehicle 10, and in particular, a turn lamp and a hazard lamp are required to be operated in synchronization with each other. Therefore, the communication signal transmitted from the combination switch wireless communication device 110 is preferably transmitted by the broadcast method.

  The wireless communication repeaters 140 and 150 that have received a communication signal broadcast from the combination switch wireless communication device 110 relay the received communication signal to transmit two front actuator wireless communication devices 120 and two rear actuator wireless communication devices. Need to be sent to the machine 130 simultaneously. Therefore, the wireless communication repeaters 140 and 150 also transmit communication signals by the broadcast method. This makes it possible to simultaneously operate a plurality of loads (lamps) that need to be synchronized. As described above, it is assumed that a communication signal having operation information and the like is broadcasted from an operation unit such as a switch to the actuator of each load.

  On the other hand, the communication signal having the failure information on the actuator side transmitted from the front actuator wireless communication device 120 and the rear actuator wireless communication device 130 is transmitted by the unicast method with the wireless communication repeater 140 or 150 as the transmission destination. Shall. Then, the wireless communication repeaters 140 and 150 that have received the communication signal having the failure information on the actuator side, etc. transmit this by a broadcast method, so that one or more wireless communication devices that process the communication signal Can be received and a predetermined process can be performed.

  In order to describe the wireless communication performed in the in-vehicle wireless communication system 100 of the present embodiment in more detail, a case where a hazard lamp mounted on the vehicle 10 is operated will be described below as an example. The hazard lamp is composed of at least four lamps (turn lamps) provided on the front left and right and rear left and right of the vehicle 10. When the hazard lamp is turned on using the combination switch 111, the four lamps are Flashes synchronously.

  In the in-vehicle wireless communication system 100 according to the present embodiment, each of the combination switch wireless communication device 110, the left and right front actuator wireless communication devices 120, the left and right rear actuator wireless communication devices 130, and the wireless communication repeaters 140 and 150 transmits. An example of the communication content of the signal is shown in FIG. In FIG. 6, as an example, the communication content is represented by 1-byte (8-bit) information. In the present embodiment, communication contents are different between the wireless communication repeater 140 and the wireless communication repeater 150.

  Further, in FIG. 6, the ID set for each is shown in the column of the transmission source ID, and the column of the transmission destination ID describes the transmission destination ID and the signal transmission method of the broadcast method or the unicast method. Yes. In the case of broadcast transmission, since the transmission destination is not specified, 0xFF is set as the transmission destination ID.

  In the in-vehicle wireless communication system 100 of the present embodiment, the communication content of the communication signal relayed by the wireless communication repeater 140 is different from the communication content of the communication signal relayed by the wireless communication repeater 150. The communication repeater has only the contents of communication required by each destination wireless communication device. That is, the wireless communication repeater 140 relays communication signals including operation information such as turn lamps and head lamps required for the front actuator wireless communication devices 120 on the left and right in front of the vehicle. On the other hand, the wireless communication repeater 150 relays communication signals including operation information such as turn lamps and tail lamps necessary for the rear actuator wireless communication devices 130 on the left and right sides behind the vehicle. Operation information such as unnecessary headlamps is not included.

  In the in-vehicle wireless communication system 100 of the present embodiment, a series of operations until the hazard lamp is activated using the communication content of the wireless transmission / reception signal shown in FIG. 6 will be described below. When the passenger turns on the hazard lamp switch of the combination switch 111 to activate the hazard lamp, the combination switch wireless communication device 110 (transmission source ID is 0x01) sets operation information for operating the hazard lamp. A communication signal is generated.

  First, in the ECU 113, 0xFF shown in the transmission destination ID column of the combination switch 111 in FIG. 6 is set as the transmission destination ID of the communication signal. Also, in Bit 6 of Byte 1 assigned for the operation information of the hazard lamp, 0 and 1 are alternately set repeatedly in the blink cycle of the hazard lamp while the hazard lamp switch is on. This communication signal is broadcast from the transmission / reception antenna 117 to the LAN 1 in the wireless communication area 21.

  When the communication signal is transmitted from the combination switch wireless communication device 110 by the broadcast method, it can be received by all the wireless communication devices including the wireless communication repeaters 140 and 150 arranged in the wireless communication area 21. When the wireless communication repeater 140 (transmission source ID is 0x02) receives the communication signal from the transmission source 0x01 by the transmission / reception antenna 141 on the LAN1 side, the wireless communication relay 140 generates a communication signal for relaying the information of the reception signal to the LAN2 side. As the transmission destination ID of the communication signal, 0xFF shown in the transmission destination ID column of the wireless communication repeater 140 shown in FIG. 6 is set. In addition, the value (0 or 1) set in Bit 6 of Byte 1 of the communication signal received by LAN 1 is set in Byte 7 and 8 of Byte 1 assigned to the hazard lamp (same as the turn lamp). Then, this communication signal is broadcast from the transmission / reception antenna 149 to the LAN 2 in the wireless communication area 22.

  Similarly, when the wireless communication repeater 150 (transmission source ID is 0x03) receives a communication signal from the transmission source 0x01 by the transmission / reception antenna 151 on the LAN1 side, the wireless communication repeater 150 transmits a communication signal for relaying information of the reception signal to the LAN3 side. Generate. As the transmission destination ID of the communication signal, 0xFF is set in the transmission destination ID column of the wireless communication repeater 150 shown in FIG. Further, the value (0 or 1) set in Bit 6 of Byte 1 of the communication signal received by LAN 1 is set in Bits 3 and 4 of Byte 1 assigned to the hazard lamp (same as the turn lamp). Then, this communication signal is broadcast from the transmission / reception antenna 159 to the LAN 3 in the wireless communication area 23.

  When a communication signal is transmitted from the transmission / reception antenna 149 by the broadcast method, the communication signal can be received by all the wireless communication devices connected to the LAN 2 in the wireless communication area 22. The left and right front actuator wireless communication devices 120 (transmission source IDs of 0x04 and 0x06, respectively) in the wireless communication area 22 receive the communication signals of the transmission source ID of 0x02 broadcast from the wireless communication repeater 140, respectively. Then, the values of Bits 7 and 8 of Byte 1 of the communication signal are read. Then, the hazard lamps (turn lamps) electrically connected to the front actuator radio communication devices 120 are blinked according to the values of Bit 7 and Bit 8 of Byte 1.

  Similarly, when a communication signal is transmitted from the transmission / reception antenna 159 by the broadcast method, the communication signal can be received by all the wireless communication devices connected to the LAN 3 in the wireless communication area 23. The left and right rear actuator wireless communication devices 130 (transmission source IDs 0x05 and 0x07, respectively) in the wireless communication area 23 receive the communication signals with the transmission source ID 0x03 broadcast from the wireless communication repeater 150, respectively. The values of Bits 3 and 4 of Byte 1 of the communication signal are read. Then, according to the values of Bits 3 and 4 of Byte 1, the hazard lamps (turn lamps) electrically connected to the respective rear actuator radio communication devices 130 are blinked.

  The front actuator wireless communication device 120 and the rear actuator wireless communication device 130 further periodically detect a failure of a combination lamp electrically connected to each of them, and transmit a communication signal having failure information to the wireless communication repeater 140 and 150 is periodically transmitted. A unicast method is used as the signal transmission method at this time.

  In the unicast method, the right (left) front actuator wireless communication device 120 transmits a communication signal in which the transmission destination ID is set to 0x02 (ID of the wireless communication repeater 140 in the LAN 2). When the wireless communication repeater 140 receives a communication signal from the front actuator wireless communication device 120 on the right side (left side) whose transmission source ID is 0x04 (0x06), the wireless communication repeater 140 receives the transmission ID set to the transmission source ID 0x04 (0x06). A completion signal is returned. In addition, the wireless communication repeater 140 broadcasts the communication signal received from the front actuator wireless communication device 120 to the LAN 1 and the LAN 2.

  The same processing as described above is also performed when a communication signal having failure information on the actuator side is transmitted from the right (left) rear actuator wireless communication device 130 by the unicast method. The right (left) rear actuator wireless communication device 130 transmits a communication signal in which the transmission destination ID is set to 0x03 (ID of the wireless communication repeater 150 in the LAN 3). When the wireless communication repeater 150 receives a communication signal from the right (left) rear actuator wireless communication device 130 having a transmission source ID of 0x05 (0x07), the wireless communication repeater 150 receives the transmission ID set to the transmission source ID 0x05 (0x07). A completion signal is returned. Further, the wireless communication repeater 150 broadcasts and transmits the communication signal received from the rear actuator wireless communication device 130 to the LAN 1 and the LAN 3.

  As described above, according to the in-vehicle wireless communication system 100 of the present embodiment, the left and right front actuator wireless communication devices 120 and the left and right rear actuators are transmitted from the combination switch wireless communication device 110 via the wireless communication repeaters 140 and 150. Communication signals having operation information can be simultaneously transmitted to the wireless communication device 130 by a broadcast method. Thereby, it becomes possible to blink a plurality of hazard lamps in synchronization.

  In the in-vehicle wireless communication system 100 according to the present embodiment, since it is not necessary to perform wireless communication through the partition walls 11 and 12, the radio wave intensity of the communication signal can be suppressed to a low level, and power consumption can be reduced. The effect that electric wave leakage can be reduced can be expected. Also, between adjacent wireless communication areas, the planes of polarization of radio waves used in each LAN are orthogonal to each other, so there is no possibility that communication signals transmitted by the broadcast method will be received by another LAN. It is possible to prevent an actuator in another wireless communication area from malfunctioning. Furthermore, radio wave interference that may occur between different LANs can be reduced. As a result, it is possible to make the frequency channels used in the LANs of all wireless communication areas the same, and the frequency channels to be used can be saved.

(Second Embodiment)
An in-vehicle wireless communication system according to the second embodiment of the present invention will be described with reference to FIG. FIG. 7 is a perspective view showing a configuration example of the in-vehicle wireless communication system 200 according to the second embodiment arranged in the vehicle. As in the first embodiment, an example in which the interior of the vehicle 10 is divided into three wireless communication areas 21, 22, and 23 by two partition walls 11 and 12 is shown. Also in the present embodiment, a combination lamp will be described as in the first embodiment. A combination switch wireless communication device 210 is provided in the wireless communication area 21, and two left and right front actuator wireless communication devices 220 and two left and right rear actuator wireless communication devices 230 are provided in the wireless communication areas 22 and 23, respectively. . Furthermore, the partition walls 11 and 12 are provided with wireless communication repeaters 240 and 250, respectively.

  In the in-vehicle wireless communication system 200 of the present embodiment, the communication content of the wireless communication signal is different from that used in the in-vehicle wireless communication system 100 of the first embodiment. An example of communication contents of communication signals used in the in-vehicle wireless communication system 200 of the present embodiment is shown in FIG. In the in-vehicle wireless communication system 200 according to the present embodiment, the wireless communication repeater 240 and the wireless communication repeater 250 are configured to have the same communication contents.

  In the in-vehicle wireless communication system 100 of the first embodiment, the communication content broadcast by the wireless communication repeater 140 and the communication content broadcast by the wireless communication repeater 150 are different. Each communication content is configured with information necessary for the front actuator wireless communication device 120 and configured with information necessary for the rear actuator wireless communication device 130.

  On the other hand, in the in-vehicle wireless communication system 200 of the present embodiment, the communication content covering both the information necessary for the front actuator wireless communication device 220 and the information necessary for the rear actuator wireless communication device 230 is represented by the wireless communication repeater 240. , 250 for broadcast transmission. Thereby, in the in-vehicle wireless communication system 200 of this embodiment, when one of the wireless communication repeaters 240 and 250 breaks down, wireless communication can be continued using the other wireless communication repeater.

  Further, in the communication contents of the communication signal of this embodiment shown in FIG. 8, the failure information when the front actuator wireless communication device 220 detects the failure of the wireless communication repeater 240, and the rear actuator wireless communication device 230 is the wireless communication relay. The failure information when the failure of the device 250 is detected is set to Bit1 of Byte2.

  Below, the communication mode at the time of failure by the in-vehicle wireless communication system 200 of the present embodiment will be described by taking as an example a case where the wireless communication repeater 250 has failed. When the wireless communication repeater 250 fails, the left and right rear actuator wireless communication devices 230 arranged in the wireless communication area 23 send communication signals having failure information of the actuator side and the wireless communication repeater 250 to other wireless communication repeaters. That is, unicast transmission is performed to the wireless communication repeater 240. Further, even when another wireless communication device (for example, another switch wireless communication device) is arranged in the wireless communication area 23, the wireless communication device transmits a communication signal to another wireless communication repeater as a wireless communication relay. Unicast to the device 240.

  Note that the rear actuator wireless communication device 230 or another wireless communication device that transmits a communication signal by the unicast method periodically transmits a communication signal having failure information on the actuator side to the wireless communication repeater 250. Sometimes a reception completion signal is returned from the wireless communication repeater 250. Therefore, the rear actuator wireless communication device 230 or another wireless communication device can detect a failure of the wireless communication repeater 250 when the reception completion signal is not returned from the wireless communication repeater 250.

  When the rear actuator wireless communication device 230 or another wireless communication device arranged in the wireless communication area 23 detects a failure of the wireless communication repeater 250, the communication signal is sent to the wireless communication repeater 240, which is another wireless communication repeater. Is transmitted by unicast. For this purpose, it is necessary that the communication signal reaches the wireless communication repeater 240 and can be received. The wireless communication repeater 240 includes a transmission / reception antenna 241 used for LAN 1 communication on the wireless communication area 21 side and a transmission / reception antenna 249 used for LAN 2 communication on the wireless communication area 22 side. However, since the plane of polarization of radio waves received by the transmission / reception antenna 241 is orthogonal to the plane of polarization of radio waves used in the LAN 2 and LAN 3, radio waves from the LAN 3 in the wireless communication area 23 cannot be received by the transmission / reception antenna 241. First, it is necessary to receive with the transmission / reception antenna 249.

  Therefore, in the in-vehicle wireless communication system 200 of the present embodiment, the communication signal from the LAN 3 passes through the partition walls 11 and 12 and reaches the transmission / reception antenna 249 of the wireless communication repeater 240 in the wireless communication area 23. The radio field intensity of a communication signal unicast transmitted from the rear actuator wireless communication device 230 of the arranged LAN 3 or another wireless communication device is made higher than usual.

  Further, the wireless communication repeater 240 performs communication in order to broadcast a communication signal to the rear actuator wireless communication device 230 of the LAN 3 disposed in the wireless communication area 23 through the partition walls 11 and 12 and another wireless communication device. Transmit the signal with a higher signal strength than normal. As shown in FIG. 8, the wireless communication repeaters 240 and 250 are configured to broadcast transmission of communication signals having the same communication contents. Therefore, even if one of the wireless communication repeaters 240 and 250 breaks down. It is possible to continue communication using the other wireless communication repeater. Although the case where the wireless communication repeater 250 has failed has been described here, the same applies to the case where the wireless communication repeater 240 fails.

  Hereinafter, as in the description of the first embodiment, communication processing in the in-vehicle wireless communication system 200 of the present embodiment will be described with reference to FIGS. 7 and 8, taking as an example a series of operations until the hazard lamp is activated. . When the wireless communication repeaters 240 and 250 are normal, the same communication as in the first embodiment is performed except that the communication contents of the communication signals of the wireless communication repeaters 240 and 250 are different. Hereinafter, as an example, a communication process when the wireless communication repeater 250 fails will be described.

  When the wireless communication repeater 250 fails, the left and right rear actuator wireless communication devices 230 respond to the communication signal of failure information on the actuator side that is periodically unicast transmitted to the wireless communication repeater 250. Since the reception completion signal is not returned from, a failure of the wireless communication repeater 250 can be detected. When the right and left rear actuator wireless communication devices 230 detect a failure of the wireless communication repeater 250, the failure information of the wireless communication repeater 250 is set in Bit1 of Byte2 of the communication signal as failure information.

  Since the left and right rear actuator wireless communication devices 230 cannot use the wireless communication repeater 250 to transmit a communication signal in which failure information of the actuator side and the wireless communication repeater 250 is set to other wireless communication areas. It is necessary to use another wireless communication repeater 240 instead of the wireless communication repeater 250. Therefore, the transmission signal transmission destination ID is changed from 0x03, which is the ID of the wireless communication repeater 250, to 0x02, which is the ID of the wireless communication repeater 240. In addition, in order to transmit the communication signal in which the failure information is set through the partition walls 11 and 12 to the transmission / reception antenna 249 of the wireless communication repeater 240, the left and right rear actuator wireless communication devices 230 have communication signals with higher radio wave intensity than usual. Is unicasted.

  When the wireless communication repeater 240 receives a communication signal from the rear actuator wireless communication device 230 on the right side (left side) having a transmission source ID of 0x05 (0x07), it normally transmits the broadcast signal only to the LAN 2 in the wireless communication area 22. The transmitted communication signal is broadcasted with a higher radio wave intensity than usual. As a result, the communication signal is transmitted to the wireless communication device of the LAN having the polarization plane of the same direction including the LAN 3 of the wireless communication area 23. In the above description, the case where the wireless communication repeater 250 has failed has been described as an example. However, even when the wireless communication repeater 240 fails, wireless communication can be continued in the same manner.

  As described above, according to the in-vehicle wireless communication system 200 of the present embodiment, even if one of the wireless communication repeaters breaks down, wireless communication can be continued using another wireless communication repeater, The operation of the load (hazard lamp in the above example) can be continued.

  In addition, the description in this Embodiment shows an example of the in-vehicle radio | wireless communications system which concerns on this invention, and is not limited to this. The detailed configuration and detailed operation of the in-vehicle wireless communication system according to the present embodiment can be changed as appropriate without departing from the spirit of the present invention.

10 Vehicle 11, 12 Bulkhead 21, 22, 23 Wireless communication area 100 In-vehicle wireless communication system 110, 210 Combination switch wireless communication device 111 Combination switch 112 Switch determination circuit 113, 123, 133, 145, 155 134, 144, 146, 154, 156 IF section 115, 125, 135, 143, 147, 153, 157 Data processing circuit 116, 126, 136, 142, 148, 152, 158 Transceiver circuit 117, 127, 137, 141, 149, 151, 159, 217, 227, 237, 241, 249, 251, 259 Transmission / reception antenna 120, 220 Front actuator wireless communication device 121, 131 Actuator 122, 132 Actuator drive circuit 13 , 230 rear actuator radios 140,150,240,250 radio communication repeater

Claims (6)

An in-vehicle wireless communication system that is mounted on a vehicle that includes at least one partition wall that serves as a barrier for wireless communication and has an in-vehicle wireless communication area divided into two or more,
A switch radio communicator arranged for each radio communication area in which one or more switches are arranged and connected to the switch;
An actuator wireless communication device arranged for each wireless communication area in which one or more actuators are arranged and connected to the actuator;
One or more wireless communication repeaters that relay communication between two adjacent wireless communication areas divided by the partition;
Each of the switch wireless communication devices has one transmission / reception antenna and transmits a communication signal by a broadcast method or a unicast method,
Each of the actuator wireless communication devices has one transmission / reception antenna and transmits a communication signal by a broadcast method or a unicast method,
The wireless communication repeater has a transmission / reception antenna in each of the two adjacent wireless communication areas and transmits a communication signal by a broadcast method,
The in-vehicle wireless communication system, wherein the transmission / reception antenna is arranged such that a radio wave polarization plane of the communication signal is orthogonal to each other between the two adjacent wireless communication areas. 2. The interior of the vehicle according to claim 1, wherein when there are two or more partition walls and two or more wireless communication repeaters are provided, communication contents of communication signals transmitted by each of the wireless communication repeaters are different. Wireless communication system. 2. The interior of the vehicle according to claim 1, wherein when there are two or more partition walls and two or more wireless communication repeaters are provided, communication contents of communication signals broadcast by each of the wireless communication repeaters are the same. Wireless communication system. When any one of the two or more wireless communication repeaters fails,
The switch wireless communication device and / or the actuator wireless communication device that transmits a communication signal to the failed wireless communication repeater by a unicast method, the communication signal having failure information is transmitted to another wireless communication with a higher radio wave intensity than normal. Send to the repeater by unicast method,
The in-vehicle wireless communication system according to claim 3, wherein the another wireless communication repeater that has received the communication signal having the failure information broadcasts the communication signal with higher radio wave intensity than usual. The in-vehicle wireless communication system according to any one of claims 1 to 4, wherein the frequency channel of the communication signal is the same in all of the two or more wireless communication areas. The in-vehicle wireless communication system according to claim 1, wherein the communication signal is modulated and restored by spread spectrum.

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