WO2019058982A1 - In-vehicle device - Google Patents

In-vehicle device Download PDF

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Publication number
WO2019058982A1
WO2019058982A1 PCT/JP2018/032994 JP2018032994W WO2019058982A1 WO 2019058982 A1 WO2019058982 A1 WO 2019058982A1 JP 2018032994 W JP2018032994 W JP 2018032994W WO 2019058982 A1 WO2019058982 A1 WO 2019058982A1
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WO
WIPO (PCT)
Prior art keywords
signal
input
twisted pair
antenna
vehicle
Prior art date
Application number
PCT/JP2018/032994
Other languages
French (fr)
Japanese (ja)
Inventor
一孝 内藤
Original Assignee
株式会社オートネットワーク技術研究所
住友電装株式会社
住友電気工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 株式会社オートネットワーク技術研究所, 住友電装株式会社, 住友電気工業株式会社 filed Critical 株式会社オートネットワーク技術研究所
Publication of WO2019058982A1 publication Critical patent/WO2019058982A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
    • B60R11/02—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • H01Q5/364—Creating multiple current paths
    • H01Q5/371—Branching current paths
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/50—Circuits using different frequencies for the two directions of communication

Definitions

  • the present invention relates to an in-vehicle device.
  • This application claims the priority based on Japanese Patent Application No. 2017-179179 filed on Sep. 19, 2017, and incorporates all the contents described in the aforementioned Japanese application.
  • Patent Document 1 discloses an on-vehicle device that communicates wirelessly with a wireless terminal, for example, an electronic key, when locking or unlocking a door of a vehicle or starting an engine.
  • a wireless terminal for example, an electronic key
  • a signal wirelessly transmitted by a wireless terminal is received via a receiving antenna. If the signal transmitted wirelessly by the wireless terminal is received via the receiving antenna, the door is locked or unlocked or the engine is started.
  • An on-vehicle apparatus is an on-vehicle apparatus in which a first signal is output via a twisted pair wire, and a second signal whose frequency band is different from that of the first signal is input and input. And a receiving antenna for outputting the second signal via the twisted pair.
  • Patent Document 1 does not disclose a specific configuration for receiving a wirelessly transmitted signal.
  • the receiving antenna preferably receives radio signals transmitted from various directions in a strong state. In order to realize this, it is necessary to shield the wirelessly transmitted signal or to arrange the receiving antenna at a position where there are few obstacles that attenuate the strength of the signal. Furthermore, it is preferable to realize the on-vehicle apparatus with a small number of parts.
  • an object of the present invention to provide an on-vehicle apparatus capable of arranging a receiving antenna at a position with few obstacles and reducing the number of parts.
  • the receiving antenna can be disposed at a position with few obstacles, and the number of parts is small.
  • the on-vehicle apparatus is an on-vehicle apparatus in which a first signal is output via a twisted pair wire, and a second signal having a frequency band different from that of the first signal is input. And a receiving antenna for outputting the input second signal via the twisted pair.
  • one twisted pair is used to transmit the first signal and the second signal, so the number of parts is small.
  • the connected devices connected to the twisted pair place the receiving antenna in the vicinity of the connected device located in a place where there are few obstacles that shield the wireless signal or attenuate the wireless signal strength. can do. Thereby, placement of the receiving antenna at a position with few obstacles is realized.
  • the receiving antenna outputs the balanced second signal via the twisted pair wire, and the balanced second signal is input via the twisted pair wire And a conversion circuit for converting the input balanced second signal into the unbalanced second signal.
  • the receiving antenna outputs the balanced second signal indicated by the voltage difference between the two conductors included in the twisted pair wire.
  • the balanced second signal is converted to an unbalanced second signal referenced to a fixed potential.
  • the balanced signal is also referred to as a differential signal.
  • Unbalanced signals are also referred to as single-ended signals.
  • the on-vehicle apparatus includes a transmitting antenna that receives the first signal via the twisted wire pair and wirelessly outputs the received first signal.
  • the receiving antenna is disposed in the vicinity of the transmitting antenna that transmits the first signal wirelessly.
  • the first signal is a signal requesting transmission of the second signal, and when the second signal is input to the receiving antenna, the operation related to the vehicle
  • An output unit for outputting instruction data for instructing execution is provided.
  • instruction data for instructing execution of an operation related to a vehicle is output.
  • the operation relating to the vehicle is, for example, locking or unlocking of the door of the vehicle or starting of the engine of the vehicle.
  • FIG. 1 is a block diagram showing the main configuration of the communication system 1 in the present embodiment.
  • the communication system 1 includes an on-vehicle device 2 and a wireless terminal 3.
  • the in-vehicle device 2 is mounted on a vehicle 200.
  • the in-vehicle device 2 and the wireless terminal 3 communicate with each other wirelessly.
  • the wireless terminal 3 is an electronic key or a smartphone.
  • Reception data indicating that an instruction to execute an operation related to a vehicle has been received from the user is input to the in-vehicle device 2.
  • the operation related to the vehicle is, for example, locking or unlocking of the door of the vehicle 200 or starting of the engine of the vehicle 200.
  • Reception data is composed of a plurality of bit values.
  • the bit value is represented by a binary value, for example, either "0" or "1". For example, when the push button provided on the doorknob is pressed, or when the push button for receiving an instruction to start the engine is pressed, the reception data is input to the in-vehicle device 2.
  • the in-vehicle device 2 sequentially transmits a plurality of request signals for requesting transmission of the response signal to the wireless terminal 3 by radio.
  • the request signal is a signal generated by modulating the amplitude or frequency of the carrier wave. Every time the wireless terminal 3 receives a request signal from the in-vehicle apparatus 2, the wireless terminal 3 wirelessly transmits a response signal indicating the signal strength of the request signal to the in-vehicle apparatus 2.
  • the response signal is also a signal generated by modulating the amplitude or frequency of the carrier wave.
  • the in-vehicle device 2 detects the position of the wireless terminal 3 based on the plurality of signal strengths indicated by the plurality of response signals received from the wireless terminal 3.
  • instruction data for instructing execution of an operation related to the vehicle is output to a device in the vehicle 200. Thereby, for example, locking or unlocking of the door or starting of the engine is performed.
  • the instruction data is also composed of a plurality of bit values.
  • the wireless terminal 3 wirelessly transmits a door signal instructing lock or unlock of the door to the on-vehicle device 2.
  • the door signal is also a signal generated by modulating the amplitude or frequency of the carrier wave as well as the request signal and the response signal.
  • the on-vehicle apparatus 2 wirelessly receives a door signal from the wireless terminal 3, the on-vehicle apparatus 2 outputs instruction data corresponding to the instruction on the received door signal to an apparatus in the vehicle 200. Thereby, the door is locked or unlocked.
  • FIG. 2 is a block diagram showing the main configuration of the in-vehicle apparatus 2.
  • the on-vehicle device 2 includes a transmitting circuit 20, a receiving circuit 21, a microcomputer (hereinafter referred to as a microcomputer) 22, twisted pair lines A1, A2, ..., A5, a receiving antenna R1, a transmitting antenna T1, T2, ..., T5.
  • the microcomputer 22 has an output unit 40, an input unit 41, an input / output unit 42, a storage unit 43 and a control unit 44.
  • each of the transmitting antennas T1, T2, ..., T5 is connected to one end of the twisted pair lines A1, A2, ..., A5.
  • One end of the receiving antenna R1 is further connected to one end of the twisted pair wire A1.
  • the other ends of the twisted pair wires A1, A2,..., A5 are connected to the transmission circuit 20.
  • the other end of the twisted pair wire A1 is further connected to the reception circuit 21.
  • the transmitter circuit 20 is further connected to the output unit 40 of the microcomputer 22.
  • the reception circuit 21 is further connected to the input unit 41 of the microcomputer 22.
  • an output unit 40, an input unit 41, an input / output unit 42, a storage unit 43, and a control unit 44 are connected to the bus 45.
  • the output unit 40 of the microcomputer 22 outputs request data for requesting transmission of the response signal to the transmission circuit 20 according to the instruction of the control unit 44.
  • the request data is composed of a plurality of bit values.
  • the transmission circuit 20 outputs the request signal to the transmission antennas T1, T2, ..., T5 via the twisted pair lines A1, A2, ..., A5, respectively.
  • Each of the transmitting antennas T1, T2,..., T5 outputs the input request signal to the wireless terminal 3 by wireless. Thereby, the request signal is transmitted to the wireless terminal 3.
  • the request signal corresponds to the first signal.
  • the transmission circuit 20 sequentially transmits the request signal wirelessly to the wireless terminal 3 via the transmission antennas T1, T2, ..., T5.
  • the transmitting circuit 20 transmits the request signal by radio from the transmitting antennas T1, T2, ..., T5 at time intervals.
  • the wireless terminal 3 wirelessly transmits a response signal indicating the signal strength of the received request signal to the on-vehicle apparatus 2.
  • a response signal and a door signal are input from the wireless terminal 3 to the receiving antenna R1.
  • the receiving antenna R1 When a response signal or door signal is input to the receiving antenna R1, the receiving antenna R1 outputs the input response signal or door signal to the receiving circuit 21 via the twisted pair wire A1.
  • the response signal or the door signal input to the receiving antenna R1 is received by the receiving circuit 21.
  • Each of the response signal and the door signal corresponds to a second signal.
  • the receiving circuit 21 When receiving the response signal, the receiving circuit 21 extracts intensity data indicating the intensity from the response signal, and outputs the extracted intensity data to the input unit 41.
  • the strength data is composed of a plurality of bit values and indicates the strength of the request signal indicated by the response signal.
  • the input unit 41 When the intensity data is input from the reception circuit 21, the input unit 41 notifies the control unit 44 of the intensity indicated by the input intensity data.
  • the reception circuit 21 When the reception circuit 21 receives a door signal, the reception circuit 21 extracts content data indicating an instruction content of the door signal from the door signal, and outputs the extracted content data to the input unit 41.
  • Content data is also composed of a plurality of bit values.
  • the input unit 41 When the content data is input from the reception circuit 21, the input unit 41 notifies the control unit 44 of the instruction content indicated by the input content data.
  • Reception data is input to the input / output unit 42 from an apparatus in the vehicle 200.
  • the input / output unit 42 notifies the control unit 44 of the content indicated by the input reception data.
  • the input / output unit 42 outputs instruction data for instructing execution of an operation related to the vehicle to a device in the vehicle 200.
  • the storage unit 43 is a non-volatile memory.
  • the storage unit 43 stores a computer program P1.
  • the control unit 44 has a CPU (Central Processing Unit) not shown.
  • the CPU of the control unit 44 executes various processes by executing the computer program P1.
  • the control unit 44 instructs the output unit 40 to output the request data to the transmission circuit 20.
  • the transmission circuit 20 sequentially transmits five request signals to the wireless terminal 3 via the transmission antennas T1, T2, ..., T5.
  • the wireless terminal 3 transmits a response signal to the on-vehicle apparatus 2.
  • the receiving circuit 21 outputs the intensity data to the input unit 41.
  • the control unit 44 detects the position of the wireless terminal 3 based on the plurality of strengths indicated by the strength data. When the detected position is a position within the predetermined range, the control unit 44 instructs the input / output unit 42 to cause the device in the vehicle 200 to output instruction data. Thereby, for example, locking or unlocking of the door or starting of the engine is performed.
  • the control unit 44 instructs the input / output unit 42 to instruct the devices in the vehicle 200 Output Thereby, the door is locked or unlocked.
  • FIG. 3 is an explanatory view of the arrangement of the receiving antenna R1 and the transmitting antennas T1, T2,..., T5.
  • the transmitting antennas T1, T2, ..., T5 are respectively disposed on the right side, the left side, the rear side, the front side, and the rear side of the central portion of the vehicle 200.
  • the transmission antennas T1, T2, and T3 output request signals toward the outside of the vehicle 200
  • the transmission antennas T4 and T5 output request signals toward the inside of the vehicle 200. Since one end of the receiving antenna R1 and one end of the transmitting antenna T1 are connected to one end of the common twisted pair line A1, the receiving antenna R1 is disposed in the vicinity of the transmitting antenna T1.
  • FIG. 4 is an explanatory diagram of frequency bands of the request signal and the response signal.
  • FIG. 4 shows the envelope (main lobe) of the spectrum of each of the request signal and the response signal.
  • the width of this envelope is, for example, the frequency band of the signal.
  • the request signal is a signal generated by modulating the amplitude or frequency of the carrier whose frequency is Ft.
  • the frequency band of the request signal is, for example, in the range of 100 kHz to 200 kHz.
  • the response signal is a signal generated by modulating the amplitude or frequency of the carrier wave whose frequency is Fr.
  • the frequency Fr is higher than the frequency Ft.
  • the door signal is also a signal generated by modulating the amplitude or frequency of the carrier wave whose frequency is Fr.
  • the frequency band of each of the response signal and the door signal is included, for example, in the range of 300 MHz to 400 MHz.
  • the frequency band of the request signal is different from the frequency band of the response signal and the door signal.
  • the frequency band of the request signal is low, and the frequency band of the response signal and the door signal is high.
  • FIG. 5 is an explanatory diagram of a transmission and reception configuration.
  • FIG. 5 shows the detailed configuration of the receiving circuit 21, the twisted pair wire A1, the receiving antenna R1, and the transmitting antenna T1.
  • the receiving antenna R1 has two elements 5a and 5b and capacitors Ca and Cb.
  • Each of the elements 5a and 5b is a rod-shaped conductor.
  • the lengths of the elements 5a and 5b are substantially the same.
  • One end face of the element 5a is opposed to one end face of the element 5b, and the two elements 5a and 5b are linearly arranged.
  • one end of the capacitor Ca is connected to one end on the element 5b side.
  • one end of the capacitor Cb is connected to one end on the element 5a side.
  • the twisted pair wire A1 has two conducting wires 6a and 6b which are twisted together.
  • the other end of each of the capacitors Ca and Cb of the receiving antenna R1 is connected to one end of each of the conducting wires 6a and 6b.
  • the other end of the conductor 6 a is connected to the transmission circuit 20 and the reception circuit 21.
  • the other end of the conductor 6 b is also connected to the transmission circuit 20 and the reception circuit 21.
  • One end of the twisted pair wire A1 corresponds to one end of the conducting wire 6a, 6b.
  • the other end of the twisted pair wire A1 corresponds to the other end of the conductors 6a and 6b.
  • the receiving antenna R1 is a so-called dipole antenna.
  • the receiving antenna R1 outputs the response signal input to the receiving antenna R1 from the other end of the two capacitors Ca and Cb to the receiving circuit 21 via the two conductors 6a and 6b of the twisted pair wire A1.
  • the receiving antenna R1 outputs the door signal input to the receiving antenna R1 to the receiving circuit 21 from the other end of the two capacitors Ca and Cb via the two conductors 6a and 6b of the twisted pair wire A1.
  • Each of the response signal and the door signal output via the twisted wire pair A1 is a balanced signal, that is, a signal indicated by a voltage difference between the two conductors 6a and 6b.
  • the signal indicated by the potential difference between the two conductors 6a and 6b in this manner is also referred to as a differential signal.
  • the transmitting antenna T1 has a rod-shaped core 70 and a coil 71.
  • the core 70 is ferromagnetic.
  • a coil 71 winds the core 70.
  • One end of the coil 71 is connected to one end of the conducting wire 6a.
  • the other end of the coil 71 is connected to one end of the conducting wire 6b.
  • the transmitting antenna T1 is a so-called bar antenna, and outputs the request signal output from the transmitting circuit 20 to the wireless terminal 3 via the twisted pair wire A1.
  • the absolute value of the impedance of each of the capacitors Ca and Cb is large for a request signal with a low frequency band and small for a response signal and a door signal with a high frequency band. Therefore, the request signal output from the transmission circuit 20 through the twisted pair wire A1 is not output from the receiving antenna R1 to the outside.
  • the absolute value of the impedance of the coil 71 is smaller for a request signal having a low frequency band and larger for a response signal and a door signal having a high frequency band. Therefore, the response signal and the door signal received by the receiving antenna R1 are not output from the transmitting antenna T1 to the outside.
  • the receiving circuit 21 includes a converting circuit 80, an extracting unit 81, and capacitors C1 and C2.
  • One end of the capacitor C1 is connected to the other end of the conducting wire 6a of the twisted pair wire A1.
  • One end of the capacitor C2 is connected to the other end of the conducting wire 6b of the twisted pair wire A1.
  • the other ends of the capacitors C1 and C2 are connected to the conversion circuit 80.
  • the conversion circuit 80 is further connected to the extraction unit 81.
  • the extraction unit 81 is further connected to the input unit 41 of the microcomputer 22.
  • the conversion circuit 80 is grounded.
  • the absolute values of the inductances of the capacitors C1 and C2 are large for a request signal having a low frequency band and small for a response signal and a door signal having a high frequency band. Therefore, the request signal output from the transmission circuit 20 to the transmission antenna T1 is not input to the conversion circuit 80. Further, the balanced response signal and the door signal are input from the receiving antenna R1 to the conversion circuit 80 through the twisted pair wire A1.
  • conversion circuit 80 converts the input balanced response signal into an unbalanced response signal based on the ground potential, and outputs the converted response signal to extraction section 81.
  • An unbalanced signal is a signal referenced to a fixed potential, eg ground, and is also referred to as a single ended signal.
  • the extraction unit 81 extracts intensity data from the input response signal, and outputs the extracted intensity data to the input unit 41 of the microcomputer 22.
  • conversion circuit 80 converts the balanced door signal into an unbalanced door signal based on the ground potential, and outputs the converted response signal to extraction unit 81.
  • extraction unit 81 extracts content data from the input door signal, and outputs the extracted content data to the input unit 41 of the microcomputer 22.
  • FIG. 6 is a circuit diagram of the conversion circuit 80. As shown in FIG. The conversion circuit 80 has three inductors 90, 91, 92. The other end of the capacitor C1 is connected to one end of each of the inductors 90 and 91. The other end of the capacitor C2 is connected to one end of the inductor 92. The other end of each of the three inductors 90, 91, 92 is grounded and connected to the extraction unit 81.
  • the three inductors 90, 91, 92 are formed, for example, by winding three coils on a common core forming an annular shape, and interact with each other.
  • the conversion circuit 80 is a so-called forced balun. As described above, the balanced response signal or door signal input from the other end of the capacitors C1 and C2 is converted by the conversion circuit 80 into an unbalanced response signal or door signal.
  • the conversion circuit 80 is not limited to a circuit having three inductors 90, 91 and 92, and may be any circuit that converts a balanced signal into an unbalanced signal.
  • Each of the twisted pair wires A2, A3, ..., A5 is configured in the same manner as the twisted pair wire A1.
  • Each of the transmitting antennas T2, T3, ..., T5 is configured in the same manner as the transmitting antenna T1.
  • the twisted pair wires A2, A3, ..., A5 are connected to the coils 71 of the transmitting antennas T2, T3, ..., T5 as well as the twisted pair wire A1, and are connected to the transmitting circuit 20.
  • Each of the transmitting antennas T2, T3, ..., T5 acts in the same manner as the transmitting antenna T1.
  • the request signal output by the transmission circuit 20 via the twisted pair wire A1 is output to the wireless terminal 3 by the transmission antenna T1.
  • the balanced response signal or door signal output from the receiving antenna R1 via the twisted wire pair A1 is converted by the conversion circuit 80 into an unbalanced response signal or door signal. From the unbalanced response signal or door signal, intensity data or content data is extracted by the extraction unit 81.
  • the transmitting antenna T1 is disposed at a place where there are few obstacles that shield the wireless signal or attenuate the wireless signal strength.
  • Each of the transmitting antennas T1, T2,..., T5 is not limited to a bar antenna, and may be an antenna capable of outputting a signal to the outside.
  • the receiving antenna R1 is not limited to a dipole antenna, and may be an antenna to which a signal transmitted by wireless is input.
  • the transmission antenna to which the reception antenna R1 is connected is not limited to the transmission antenna T1, and may be a transmission antenna connected to the transmission circuit 20 via a twisted pair line.
  • the number of transmitting antennas is not limited to five, and may be one, two, three, four or six or more.
  • the number of receiving antennas is not limited to one, and may be two or more.
  • each of the plurality of receive antennas is connected to the plurality of transmit antennas.
  • a receiving antenna may be connected to each transmitting antenna.
  • a technique called diversity is used. Therefore, a process of combining a plurality of signals input to a plurality of receiving antennas into one signal, or a process of selecting a signal having the highest signal strength among a plurality of signals input to a plurality of receiving antennas, etc. To be done.
  • connection device to which the reception antenna is connected is not limited to the transmission antenna, and may be any device that outputs a signal whose frequency band is different from that of the response signal and the door signal through the twisted pair wire.
  • the connection device may be, for example, a speaker.
  • a baseband signal is output to the speaker via the twisted pair wire.
  • the frequency band of the baseband signal is different from the frequency band of the response signal and the door signal.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Lock And Its Accessories (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Details Of Aerials (AREA)
  • Transceivers (AREA)

Abstract

This in-vehicle device is provided with a transmission circuit (20), a reception circuit (21), a twisted pair wire (A1), a reception antenna (R1) and a transmission antenna (T1). The transmission circuit (20) outputs a first signal to the transmission antenna (T1) via the twisted pair wire (A1). A second signal, which has a frequency band that is different from the frequency band of the first signal, is input into the reception antenna (R1). The reception antenna (R1) outputs the input second signal to the reception circuit (21) via the twisted pair wire (A1).

Description

車載装置In-vehicle device
　本発明は車載装置に関する。
　本出願は、２０１７年９月１９日出願の日本出願第２０１７－１７９１７９号に基づく優先権を主張し、前記日本出願に記載された全ての記載内容を援用するものである。 The present invention relates to an in-vehicle device.
This application claims the priority based on Japanese Patent Application No. 2017-179179 filed on Sep. 19, 2017, and incorporates all the contents described in the aforementioned Japanese application.
　特許文献１には、車両のドアのロック若しくはアンロック、又は、エンジンの始動を行う場合に、無線端末、例えば、電子キーと無線で通信する車載装置が開示されている。このような従来の車載装置では、無線端末が無線で送信した信号を、受信アンテナを介して受信する。無線端末が無線で送信した信号が受信アンテナを介して受信された場合、ドアのロック若しくはアンロック、又は、エンジンの始動が行われる。 Patent Document 1 discloses an on-vehicle device that communicates wirelessly with a wireless terminal, for example, an electronic key, when locking or unlocking a door of a vehicle or starting an engine. In such a conventional on-vehicle apparatus, a signal wirelessly transmitted by a wireless terminal is received via a receiving antenna. If the signal transmitted wirelessly by the wireless terminal is received via the receiving antenna, the door is locked or unlocked or the engine is started.
特開２００９－２１２９２３号公報JP, 2009-212923, A
　本発明の一態様に係る車載装置は、ツイストペア線を介して第１信号が出力される車載装置であって、周波数帯域が前記第１信号の周波数帯域と異なる第２信号が入力され、入力された該第２信号を、前記ツイストペア線を介して出力する受信アンテナを備える。 An on-vehicle apparatus according to an aspect of the present invention is an on-vehicle apparatus in which a first signal is output via a twisted pair wire, and a second signal whose frequency band is different from that of the first signal is input and input. And a receiving antenna for outputting the second signal via the twisted pair.
本実施形態における通信システムの要部構成を示すブロック図である。It is a block diagram which shows the principal part structure of the communication system in this embodiment. 車載装置の要部構成を示すブロック図である。It is a block diagram which shows the principal part structure of a vehicle-mounted apparatus. 受信アンテナ及び送信アンテナの配置の説明図である。It is an explanatory view of arrangement of a receiving antenna and a transmitting antenna. 要求信号及び応答信号の周波数帯域の説明図である。It is explanatory drawing of the frequency band of a request signal and a response signal. 送受信の構成の説明図である。It is explanatory drawing of the structure of transmission / reception. 変換回路の回路図である。It is a circuit diagram of a conversion circuit.
［本開示が解決しようとする課題］
　特許文献１には、無線で送信された信号を受信する具体的な構成が開示されていない。受信アンテナは、強度が強い状態で種々の方向から送信された無線の信号が入力されることが好ましい。これを実現するためには、無線で送信された信号を遮蔽するか、又は、この信号の強度を減衰させる障害物が少ない位置に受信アンテナを配置する必要がある。更には、少ない部品点数で車載装置を実現することが好ましい。 [Problems to be solved by the present disclosure]
Patent Document 1 does not disclose a specific configuration for receiving a wirelessly transmitted signal. The receiving antenna preferably receives radio signals transmitted from various directions in a strong state. In order to realize this, it is necessary to shield the wirelessly transmitted signal or to arrange the receiving antenna at a position where there are few obstacles that attenuate the strength of the signal. Furthermore, it is preferable to realize the on-vehicle apparatus with a small number of parts.
　そこで、障害物が少ない位置に受信アンテナを配置することができ、部品点数が少ない車載装置を提供することを目的とする。 Therefore, it is an object of the present invention to provide an on-vehicle apparatus capable of arranging a receiving antenna at a position with few obstacles and reducing the number of parts.
［本開示の効果］
　本開示によれば、障害物が少ない位置に受信アンテナを配置することができ、部品点数が少ない。 [Effect of the present disclosure]
According to the present disclosure, the receiving antenna can be disposed at a position with few obstacles, and the number of parts is small.
［本発明の実施形態の説明］
　最初に本発明の実施態様を列挙して説明する。以下に記載する実施形態の少なくとも一部を任意に組み合わせてもよい。 Description of the embodiment of the present invention
First, the embodiments of the present invention will be listed and described. At least a part of the embodiments described below may be arbitrarily combined.
（１）本発明の一態様に係る車載装置は、ツイストペア線を介して第１信号が出力される車載装置であって、周波数帯域が前記第１信号の周波数帯域と異なる第２信号が入力され、入力された該第２信号を、前記ツイストペア線を介して出力する受信アンテナを備える。 (1) The on-vehicle apparatus according to an aspect of the present invention is an on-vehicle apparatus in which a first signal is output via a twisted pair wire, and a second signal having a frequency band different from that of the first signal is input. And a receiving antenna for outputting the input second signal via the twisted pair.
　上記の一態様にあっては、第１信号及び第２信号の伝送に１つのツイストペア線が用いられるため、部品点数が少ない。ツイストペア線に接続されている接続機器の中で、無線の信号を遮蔽するか、又は、無線の信号の強度を減衰させる障害物が少ない場所に配置されている接続機器の近傍に受信アンテナを配置することができる。これにより、障害物が少ない位置への受信アンテナの配置が実現される。 In the above aspect, one twisted pair is used to transmit the first signal and the second signal, so the number of parts is small. Among the connected devices connected to the twisted pair, place the receiving antenna in the vicinity of the connected device located in a place where there are few obstacles that shield the wireless signal or attenuate the wireless signal strength. can do. Thereby, placement of the receiving antenna at a position with few obstacles is realized.
（２）本発明の一態様に係る車載装置では、前記受信アンテナは、平衡な前記第２信号を、前記ツイストペア線を介して出力し、前記ツイストペア線を介して平衡な前記第２信号が入力され、入力された平衡な該第２信号を不平衡な該第２信号に変換する変換回路を備える。 (2) In the on-vehicle apparatus according to one aspect of the present invention, the receiving antenna outputs the balanced second signal via the twisted pair wire, and the balanced second signal is input via the twisted pair wire And a conversion circuit for converting the input balanced second signal into the unbalanced second signal.
　上記の一態様にあっては、ツイストペア線に含まれる２つの導線の電圧差で示される平衡な第２信号を受信アンテナは出力する。平衡な第２信号は、固定電位を基準とした不平衡な第２信号に変換される。平衡な信号は差動信号とも呼ばれる。不平衡な信号はシングルエンド信号とも呼ばれる。 In the above aspect, the receiving antenna outputs the balanced second signal indicated by the voltage difference between the two conductors included in the twisted pair wire. The balanced second signal is converted to an unbalanced second signal referenced to a fixed potential. The balanced signal is also referred to as a differential signal. Unbalanced signals are also referred to as single-ended signals.
（３）本発明の一態様に係る車載装置は、前記ツイストペア線を介して前記第１信号が入力され、入力された該第１信号を無線で出力する送信アンテナを備える。 (3) The on-vehicle apparatus according to an aspect of the present invention includes a transmitting antenna that receives the first signal via the twisted wire pair and wirelessly outputs the received first signal.
　上記の一態様にあっては、受信アンテナは、第１信号を無線で送信する送信アンテナの近傍に配置されている。 In the above aspect, the receiving antenna is disposed in the vicinity of the transmitting antenna that transmits the first signal wirelessly.
（４）本発明の一態様に係る車載装置は、前記第１信号は前記第２信号の送信を要求する信号であり、前記受信アンテナに前記第２信号が入力された場合に車両に関する動作の実行を指示する指示データを出力する出力部を備える。 (4) In the on-vehicle apparatus according to one aspect of the present invention, the first signal is a signal requesting transmission of the second signal, and when the second signal is input to the receiving antenna, the operation related to the vehicle An output unit for outputting instruction data for instructing execution is provided.
　上記の一態様にあっては、送信アンテナから第１信号を出力して第２信号が受信アンテナに入力した場合、車両に関する動作の実行を指示する指示データを出力する。車両に関する動作は、例えば、車両のドアのロック若しくはアンロック、又は、車両のエンジンの始動である。 In the above aspect, when the first signal is output from the transmitting antenna and the second signal is input to the receiving antenna, instruction data for instructing execution of an operation related to a vehicle is output. The operation relating to the vehicle is, for example, locking or unlocking of the door of the vehicle or starting of the engine of the vehicle.
［本発明の実施形態の詳細］
　本発明の実施形態に係る通信システムの具体例を、以下に図面を参照しつつ説明する。なお、本発明はこれらの例示に限定されるものではなく、請求の範囲によって示され、請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。 Details of the Embodiment of the Present Invention
Specific examples of the communication system according to the embodiment of the present invention will be described below with reference to the drawings. The present invention is not limited to these exemplifications, is shown by the claims, and is intended to include all modifications within the scope and meaning equivalent to the claims.
　図１は本実施形態における通信システム１の要部構成を示すブロック図である。通信システム１は車載装置２及び無線端末３を備える。車載装置２は車両２００に搭載されている。車載装置２及び無線端末３は相互に無線で通信する。無線端末３は、電子キー又はスマートフォン等である。 FIG. 1 is a block diagram showing the main configuration of the communication system 1 in the present embodiment. The communication system 1 includes an on-vehicle device 2 and a wireless terminal 3. The in-vehicle device 2 is mounted on a vehicle 200. The in-vehicle device 2 and the wireless terminal 3 communicate with each other wirelessly. The wireless terminal 3 is an electronic key or a smartphone.
　車載装置２には、車両に関する動作の実行指示を使用者から受け付けたことを示す受付データが入力される。車両に関する動作は、例えば、車両２００のドアのロック若しくはアンロック、又は、車両２００のエンジンの始動である。受付データは複数のビット値で構成される。ビット値は、２値、例えば、「０」及び「１」のいずれかで表される。例えば、ドアノブに設けられている押ボタンが押された場合、又は、エンジンの始動指示を受け付ける押ボタンが押された場合に受付データが車載装置２に入力される。 Reception data indicating that an instruction to execute an operation related to a vehicle has been received from the user is input to the in-vehicle device 2. The operation related to the vehicle is, for example, locking or unlocking of the door of the vehicle 200 or starting of the engine of the vehicle 200. Reception data is composed of a plurality of bit values. The bit value is represented by a binary value, for example, either "0" or "1". For example, when the push button provided on the doorknob is pressed, or when the push button for receiving an instruction to start the engine is pressed, the reception data is input to the in-vehicle device 2.
　車載装置２は、受付データが入力された場合、応答信号の送信を要求する複数の要求信号を無線端末３に無線で順次送信する。要求信号は、搬送波の振幅又は周波数等を変調することによって生成される信号である。無線端末３は、車載装置２から要求信号を受信する都度、要求信号の信号強度を示す応答信号を車載装置２に無線で送信する。応答信号も、要求信号と同様に、搬送波の振幅又は周波数等を変調することによって生成される信号である。 When the reception data is input, the in-vehicle device 2 sequentially transmits a plurality of request signals for requesting transmission of the response signal to the wireless terminal 3 by radio. The request signal is a signal generated by modulating the amplitude or frequency of the carrier wave. Every time the wireless terminal 3 receives a request signal from the in-vehicle apparatus 2, the wireless terminal 3 wirelessly transmits a response signal indicating the signal strength of the request signal to the in-vehicle apparatus 2. Similarly to the request signal, the response signal is also a signal generated by modulating the amplitude or frequency of the carrier wave.
　車載装置２は、複数の応答信号を受信した場合、無線端末３から受信した複数の応答信号が示す複数の信号強度に基づいて、無線端末３の位置を検知する。車載装置２が検知した位置が所定範囲内の位置である場合に車両に関する動作の実行を指示する指示データを車両２００内の装置に出力する。これにより、例えば、ドアのロック若しくはアンロック、又は、エンジンの始動が行われる。指示データも複数のビット値で構成される。 When the plurality of response signals are received, the in-vehicle device 2 detects the position of the wireless terminal 3 based on the plurality of signal strengths indicated by the plurality of response signals received from the wireless terminal 3. When the position detected by the in-vehicle device 2 is a position within a predetermined range, instruction data for instructing execution of an operation related to the vehicle is output to a device in the vehicle 200. Thereby, for example, locking or unlocking of the door or starting of the engine is performed. The instruction data is also composed of a plurality of bit values.
　無線端末３は、ドアのロック又はアンロックを指示するドア信号を無線で車載装置２に送信する。ドア信号も、要求信号及び応答信号と同様に、搬送波の振幅又は周波数等を変調することによって生成される信号である。車載装置２は、無線端末３からドア信号を無線で受信した場合、受信したドア信号の指示に応じた指示データを車両２００内の装置に出力する。これにより、ドアのロック又はアンロックが行われる。 The wireless terminal 3 wirelessly transmits a door signal instructing lock or unlock of the door to the on-vehicle device 2. The door signal is also a signal generated by modulating the amplitude or frequency of the carrier wave as well as the request signal and the response signal. When the on-vehicle apparatus 2 wirelessly receives a door signal from the wireless terminal 3, the on-vehicle apparatus 2 outputs instruction data corresponding to the instruction on the received door signal to an apparatus in the vehicle 200. Thereby, the door is locked or unlocked.
　図２は、車載装置２の要部構成を示すブロック図である。車載装置２は、送信回路２０、受信回路２１、マイクロコンピュータ（以下、マイコンという）２２、ツイストペア線Ａ１，Ａ２，・・・，Ａ５、受信アンテナＲ１及び送信アンテナＴ１，Ｔ２，・・・，Ｔ５を有する。マイコン２２は、出力部４０、入力部４１、入出力部４２、記憶部４３及び制御部４４を有する。 FIG. 2 is a block diagram showing the main configuration of the in-vehicle apparatus 2. The on-vehicle device 2 includes a transmitting circuit 20, a receiving circuit 21, a microcomputer (hereinafter referred to as a microcomputer) 22, twisted pair lines A1, A2, ..., A5, a receiving antenna R1, a transmitting antenna T1, T2, ..., T5. Have. The microcomputer 22 has an output unit 40, an input unit 41, an input / output unit 42, a storage unit 43 and a control unit 44.
　送信アンテナＴ１，Ｔ２，・・・，Ｔ５夫々の一端は、ツイストペア線Ａ１，Ａ２，・・・，Ａ５の一端に接続されている。ツイストペア線Ａ１の一端には、更に、受信アンテナＲ１の一端が接続されている。ツイストペア線Ａ１，Ａ２，・・・，Ａ５夫々の他端は送信回路２０に接続されている。ツイストペア線Ａ１の他端は、更に、受信回路２１に接続されている。送信回路２０は、更に、マイコン２２の出力部４０に接続されている。受信回路２１は、更に、マイコン２２の入力部４１に接続されている。マイコン２２内では、出力部４０、入力部４１、入出力部４２、記憶部４３及び制御部４４はバス４５に接続されている。 One end of each of the transmitting antennas T1, T2, ..., T5 is connected to one end of the twisted pair lines A1, A2, ..., A5. One end of the receiving antenna R1 is further connected to one end of the twisted pair wire A1. The other ends of the twisted pair wires A1, A2,..., A5 are connected to the transmission circuit 20. The other end of the twisted pair wire A1 is further connected to the reception circuit 21. The transmitter circuit 20 is further connected to the output unit 40 of the microcomputer 22. The reception circuit 21 is further connected to the input unit 41 of the microcomputer 22. In the microcomputer 22, an output unit 40, an input unit 41, an input / output unit 42, a storage unit 43, and a control unit 44 are connected to the bus 45.
　マイコン２２の出力部４０は、制御部４４の指示に従って、応答信号の送信を要求する要求データを送信回路２０に出力する。要求データは、複数のビット値で構成される。送信回路２０は、出力部４０から要求データが入力された場合、要求信号を、ツイストペア線Ａ１，Ａ２，・・・，Ａ５夫々を介して、送信アンテナＴ１，Ｔ２，・・・，Ｔ５に出力する。送信アンテナＴ１，Ｔ２，・・・，Ｔ５夫々は、入力された要求信号を無線で無線端末３に出力する。これにより、要求信号が無線端末３に送信される。要求信号は第１信号に相当する。 The output unit 40 of the microcomputer 22 outputs request data for requesting transmission of the response signal to the transmission circuit 20 according to the instruction of the control unit 44. The request data is composed of a plurality of bit values. When the request data is input from the output unit 40, the transmission circuit 20 outputs the request signal to the transmission antennas T1, T2, ..., T5 via the twisted pair lines A1, A2, ..., A5, respectively. Do. Each of the transmitting antennas T1, T2,..., T5 outputs the input request signal to the wireless terminal 3 by wireless. Thereby, the request signal is transmitted to the wireless terminal 3. The request signal corresponds to the first signal.
　送信回路２０は、要求信号を、送信アンテナＴ１，Ｔ２，・・・，Ｔ５を介して無線端末３に無線で順次送信する。言い換えると、送信回路２０は、送信アンテナＴ１，Ｔ２，・・・，Ｔ５夫々から、時間間隔を空けて要求信号を無線で送信する。無線端末３は、１つの要求信号を受信する都度、受信した要求信号の信号強度を示す応答信号を車載装置２に無線で送信する。 The transmission circuit 20 sequentially transmits the request signal wirelessly to the wireless terminal 3 via the transmission antennas T1, T2, ..., T5. In other words, the transmitting circuit 20 transmits the request signal by radio from the transmitting antennas T1, T2, ..., T5 at time intervals. Each time the wireless terminal 3 receives one request signal, the wireless terminal 3 wirelessly transmits a response signal indicating the signal strength of the received request signal to the on-vehicle apparatus 2.
　受信アンテナＲ１には、無線端末３から応答信号及びドア信号が入力される。受信アンテナＲ１に応答信号又はドア信号が入力された場合、受信アンテナＲ１は、入力された応答信号又はドア信号を、ツイストペア線Ａ１を介して受信回路２１に出力する。これにより、受信アンテナＲ１に入力された応答信号又はドア信号は、受信回路２１によって受信される。応答信号及びドア信号夫々は第２信号に相当する。 A response signal and a door signal are input from the wireless terminal 3 to the receiving antenna R1. When a response signal or door signal is input to the receiving antenna R1, the receiving antenna R1 outputs the input response signal or door signal to the receiving circuit 21 via the twisted pair wire A1. Thus, the response signal or the door signal input to the receiving antenna R1 is received by the receiving circuit 21. Each of the response signal and the door signal corresponds to a second signal.
　受信回路２１は、応答信号を受信した場合、応答信号から、強度を示す強度データを抽出し、抽出した強度データを入力部４１に出力する。強度データは、複数のビット値で構成され、応答信号が示す要求信号の強度を示す。入力部４１は、受信回路２１から強度データが入力された場合、入力された強度データが示す強度を制御部４４に通知する。 When receiving the response signal, the receiving circuit 21 extracts intensity data indicating the intensity from the response signal, and outputs the extracted intensity data to the input unit 41. The strength data is composed of a plurality of bit values and indicates the strength of the request signal indicated by the response signal. When the intensity data is input from the reception circuit 21, the input unit 41 notifies the control unit 44 of the intensity indicated by the input intensity data.
　受信回路２１は、ドア信号を受信した場合、ドア信号から、ドア信号の指示内容を示す内容データを抽出し、抽出した内容データを入力部４１に出力する。内容データも複数のビット値で構成される。入力部４１は、受信回路２１から内容データが入力された場合、入力された内容データが示す指示内容を制御部４４に通知する。 When the reception circuit 21 receives a door signal, the reception circuit 21 extracts content data indicating an instruction content of the door signal from the door signal, and outputs the extracted content data to the input unit 41. Content data is also composed of a plurality of bit values. When the content data is input from the reception circuit 21, the input unit 41 notifies the control unit 44 of the instruction content indicated by the input content data.
　入出力部４２には、車両２００内の装置から受付データが入力される。入出力部４２は、受付データが入力された場合、入力された受付データが示す内容を制御部４４に通知する。入出力部４２は、制御部４４の指示に従って、車両に関する動作の実行を指示する指示データを車両２００内の装置に出力する。 Reception data is input to the input / output unit 42 from an apparatus in the vehicle 200. When the reception data is input, the input / output unit 42 notifies the control unit 44 of the content indicated by the input reception data. According to the instruction of the control unit 44, the input / output unit 42 outputs instruction data for instructing execution of an operation related to the vehicle to a device in the vehicle 200.
　記憶部４３は不揮発性メモリである。記憶部４３には、コンピュータプログラムＰ１が記憶されている。制御部４４は、図示しないＣＰＵ(Central Processing Unit)を有する。制御部４４のＣＰＵは、コンピュータプログラムＰ１を実行することによって種々の処理を実行する。 The storage unit 43 is a non-volatile memory. The storage unit 43 stores a computer program P1. The control unit 44 has a CPU (Central Processing Unit) not shown. The CPU of the control unit 44 executes various processes by executing the computer program P1.
　制御部４４は、入出力部４２に受付データが入力された場合、出力部４０に指示して、要求データを送信回路２０に出力させる。これにより、送信回路２０は、送信アンテナＴ１，Ｔ２，・・・，Ｔ５を介して、５つの要求信号を無線端末３に順次送信する。前述したように、無線端末３は、要求信号を受信する都度、応答信号を車載装置２に送信する。受信アンテナＲ１に応答信号が入力されて受信回路２１が応答信号を受信した場合、受信回路２１は強度データを入力部４１に出力する。 When the reception data is input to the input / output unit 42, the control unit 44 instructs the output unit 40 to output the request data to the transmission circuit 20. Thereby, the transmission circuit 20 sequentially transmits five request signals to the wireless terminal 3 via the transmission antennas T1, T2, ..., T5. As described above, each time the wireless terminal 3 receives a request signal, the wireless terminal 3 transmits a response signal to the on-vehicle apparatus 2. When the response signal is input to the receiving antenna R1 and the receiving circuit 21 receives the response signal, the receiving circuit 21 outputs the intensity data to the input unit 41.
　制御部４４は、入力部４１に複数の強度データが入力された場合、これらの強度データが示す複数の強度に基づいて、無線端末３の位置を検知する。制御部４４は、検知した位置が所定範囲内の位置である場合、入出力部４２に指示して車両２００内の装置に指示データを出力させる。これにより、例えば、ドアのロック若しくはアンロック、又は、エンジンの始動が行われる。 When a plurality of strength data is input to the input unit 41, the control unit 44 detects the position of the wireless terminal 3 based on the plurality of strengths indicated by the strength data. When the detected position is a position within the predetermined range, the control unit 44 instructs the input / output unit 42 to cause the device in the vehicle 200 to output instruction data. Thereby, for example, locking or unlocking of the door or starting of the engine is performed.
　制御部４４は、受信回路２１が受信アンテナＲ１を介してドア信号を受信して入力部４１に内容データが入力された場合、入出力部４２に指示して、車両２００内の装置に指示データを出力させる。これにより、ドアのロック又はアンロックが行われる。 When the reception circuit 21 receives a door signal through the reception antenna R1 and the content data is input to the input unit 41, the control unit 44 instructs the input / output unit 42 to instruct the devices in the vehicle 200 Output Thereby, the door is locked or unlocked.
　図３は、受信アンテナＲ１及び送信アンテナＴ１，Ｔ２，・・・，Ｔ５の配置の説明図である。送信アンテナＴ１，Ｔ２，・・・，Ｔ５夫々は、車両２００の右側、左側、後側、前側及び中央部の後側に配置されている。例えば、送信アンテナＴ１，Ｔ２，Ｔ３は、車両２００の外側に向けて要求信号を出力し、送信アンテナＴ４，Ｔ５は、車両２００の内側に向けて要求信号を出力する。受信アンテナＲ１及び送信アンテナＴ１の一端は共通のツイストペア線Ａ１の一端に接続されているので、受信アンテナＲ１は送信アンテナＴ１の近傍に配置される。 FIG. 3 is an explanatory view of the arrangement of the receiving antenna R1 and the transmitting antennas T1, T2,..., T5. The transmitting antennas T1, T2, ..., T5 are respectively disposed on the right side, the left side, the rear side, the front side, and the rear side of the central portion of the vehicle 200. For example, the transmission antennas T1, T2, and T3 output request signals toward the outside of the vehicle 200, and the transmission antennas T4 and T5 output request signals toward the inside of the vehicle 200. Since one end of the receiving antenna R1 and one end of the transmitting antenna T1 are connected to one end of the common twisted pair line A1, the receiving antenna R1 is disposed in the vicinity of the transmitting antenna T1.
　図４は、要求信号及び応答信号の周波数帯域の説明図である。図４には、要求信号及び応答信号夫々のスペクトルの包絡線（メインローブ）が示されている。この包絡線の幅が、例えば、信号の周波数帯域である。 FIG. 4 is an explanatory diagram of frequency bands of the request signal and the response signal. FIG. 4 shows the envelope (main lobe) of the spectrum of each of the request signal and the response signal. The width of this envelope is, for example, the frequency band of the signal.
　要求信号は、周波数がＦｔである搬送波の振幅又は周波数等を変調することによって生成される信号である。要求信号の周波数帯域は、例えば、１００ｋＨｚから２００ｋＨｚの範囲内に含まれる。 The request signal is a signal generated by modulating the amplitude or frequency of the carrier whose frequency is Ft. The frequency band of the request signal is, for example, in the range of 100 kHz to 200 kHz.
　応答信号は、周波数がＦｒである搬送波の振幅又は周波数等を変調することによって生成される信号である。周波数Ｆｒは周波数Ｆｔよりも高い。ドア信号も、応答信号と同様に、周波数がＦｒである搬送波の振幅又は周波数等を変調することによって生成される信号である。応答信号及びドア信号夫々の周波数帯域は、例えば、３００ＭＨｚから４００ＭＨｚの範囲内に含まれる。
　要求信号の周波数帯域は、応答信号及びドア信号の周波数帯域と異なる。要求信号の周波数帯域は低く、応答信号及びドア信号の周波数帯域は高い。 The response signal is a signal generated by modulating the amplitude or frequency of the carrier wave whose frequency is Fr. The frequency Fr is higher than the frequency Ft. Similarly to the response signal, the door signal is also a signal generated by modulating the amplitude or frequency of the carrier wave whose frequency is Fr. The frequency band of each of the response signal and the door signal is included, for example, in the range of 300 MHz to 400 MHz.
The frequency band of the request signal is different from the frequency band of the response signal and the door signal. The frequency band of the request signal is low, and the frequency band of the response signal and the door signal is high.
　図５は、送受信の構成の説明図である。図５には、受信回路２１、ツイストペア線Ａ１、受信アンテナＲ１及び送信アンテナＴ１の詳細な構成が示されている。 FIG. 5 is an explanatory diagram of a transmission and reception configuration. FIG. 5 shows the detailed configuration of the receiving circuit 21, the twisted pair wire A1, the receiving antenna R1, and the transmitting antenna T1.
　受信アンテナＲ１は、２つのエレメント５ａ，５ｂ及びキャパシタＣａ，Ｃｂを有する。エレメント５ａ，５ｂ夫々は、棒状の導体である。エレメント５ａ，５ｂの長さは略一致している。エレメント５ａの一端面は、エレメント５ｂの一端面と対向しており、２つのエレメント５ａ，５ｂは直線状に配置されている。エレメント５ａにおいて、エレメント５ｂ側の一端部にキャパシタＣａの一端が接続されている。同様に、エレメント５ｂにおいて、エレメント５ａ側の一端部にキャパシタＣｂの一端が接続されている。 The receiving antenna R1 has two elements 5a and 5b and capacitors Ca and Cb. Each of the elements 5a and 5b is a rod-shaped conductor. The lengths of the elements 5a and 5b are substantially the same. One end face of the element 5a is opposed to one end face of the element 5b, and the two elements 5a and 5b are linearly arranged. In the element 5a, one end of the capacitor Ca is connected to one end on the element 5b side. Similarly, in the element 5b, one end of the capacitor Cb is connected to one end on the element 5a side.
　ツイストペア線Ａ１は、撚り合されている２つの導線６ａ，６ｂを有する。受信アンテナＲ１が有するキャパシタＣａ，Ｃｂ夫々の他端は、導線６ａ，６ｂの一端に接続されている。導線６ａの他端は送信回路２０及び受信回路２１に接続されている。導線６ｂの他端も送信回路２０及び受信回路２１に接続されている。ツイストペア線Ａ１の一端は、導線６ａ，６ｂの一端に相当する。ツイストペア線Ａ１の他端は、導線６ａ，６ｂの他端に相当する。 The twisted pair wire A1 has two conducting wires 6a and 6b which are twisted together. The other end of each of the capacitors Ca and Cb of the receiving antenna R1 is connected to one end of each of the conducting wires 6a and 6b. The other end of the conductor 6 a is connected to the transmission circuit 20 and the reception circuit 21. The other end of the conductor 6 b is also connected to the transmission circuit 20 and the reception circuit 21. One end of the twisted pair wire A1 corresponds to one end of the conducting wire 6a, 6b. The other end of the twisted pair wire A1 corresponds to the other end of the conductors 6a and 6b.
　受信アンテナＲ１は、所謂ダイポールアンテナである。受信アンテナＲ１は、受信アンテナＲ１に入力された応答信号を、２つのキャパシタＣａ，Ｃｂの他端から、ツイストペア線Ａ１の２つの導線６ａ，６ｂを介して受信回路２１に出力する。同様に、受信アンテナＲ１は、受信アンテナＲ１に入力されたドア信号を、２つのキャパシタＣａ，Ｃｂの他端から、ツイストペア線Ａ１の２つの導線６ａ，６ｂを介して受信回路２１に出力する。ツイストペア線Ａ１を介して出力される応答信号及びドア信号夫々は、平衡な信号、即ち、２つの導線６ａ，６ｂの電圧差で示される信号である。このように２つの導線６ａ，６ｂの電位差で示される信号は、差動信号とも呼ばれる。 The receiving antenna R1 is a so-called dipole antenna. The receiving antenna R1 outputs the response signal input to the receiving antenna R1 from the other end of the two capacitors Ca and Cb to the receiving circuit 21 via the two conductors 6a and 6b of the twisted pair wire A1. Similarly, the receiving antenna R1 outputs the door signal input to the receiving antenna R1 to the receiving circuit 21 from the other end of the two capacitors Ca and Cb via the two conductors 6a and 6b of the twisted pair wire A1. Each of the response signal and the door signal output via the twisted wire pair A1 is a balanced signal, that is, a signal indicated by a voltage difference between the two conductors 6a and 6b. The signal indicated by the potential difference between the two conductors 6a and 6b in this manner is also referred to as a differential signal.
　送信アンテナＴ１は、棒状のコア７０とコイル７１とを有する。コア７０は強磁性体である。コイル７１がコア７０を巻回している。コイル７１の一端は導線６ａの一端に接続されている。コイル７１の他端は導線６ｂの一端に接続されている。送信アンテナＴ１は、所謂バーアンテナであり、ツイストペア線Ａ１を介して、送信回路２０から出力された要求信号を無線端末３に出力する。 The transmitting antenna T1 has a rod-shaped core 70 and a coil 71. The core 70 is ferromagnetic. A coil 71 winds the core 70. One end of the coil 71 is connected to one end of the conducting wire 6a. The other end of the coil 71 is connected to one end of the conducting wire 6b. The transmitting antenna T1 is a so-called bar antenna, and outputs the request signal output from the transmitting circuit 20 to the wireless terminal 3 via the twisted pair wire A1.
　キャパシタＣａ，Ｃｂ夫々のインピーダンスの絶対値は、周波数帯域が低い要求信号に対して大きく、周波数帯域が高い応答信号及びドア信号に対して小さい。このため、送信回路２０がツイストペア線Ａ１を介して出力した要求信号が受信アンテナＲ１から外部に出力されることはない。 The absolute value of the impedance of each of the capacitors Ca and Cb is large for a request signal with a low frequency band and small for a response signal and a door signal with a high frequency band. Therefore, the request signal output from the transmission circuit 20 through the twisted pair wire A1 is not output from the receiving antenna R1 to the outside.
　また、コイル７１のインピーダンスの絶対値は、周波数帯域が低い要求信号に対して小さく、周波数帯域が高い応答信号及びドア信号に対して大きい。このため、受信アンテナＲ１が受信した応答信号及びドア信号が送信アンテナＴ１から外部に出力されることはない。 Further, the absolute value of the impedance of the coil 71 is smaller for a request signal having a low frequency band and larger for a response signal and a door signal having a high frequency band. Therefore, the response signal and the door signal received by the receiving antenna R1 are not output from the transmitting antenna T1 to the outside.
　受信回路２１は、変換回路８０、抽出部８１及びキャパシタＣ１，Ｃ２を有する。キャパシタＣ１の一端は、ツイストペア線Ａ１の導線６ａの他端に接続されている。キャパシタＣ２の一端は、ツイストペア線Ａ１の導線６ｂの他端に接続されている。キャパシタＣ１，Ｃ２の他端は、変換回路８０に接続されている。変換回路８０は、更に、抽出部８１に接続されている。抽出部８１は、更に、マイコン２２の入力部４１に接続されている。変換回路８０は接地されている。 The receiving circuit 21 includes a converting circuit 80, an extracting unit 81, and capacitors C1 and C2. One end of the capacitor C1 is connected to the other end of the conducting wire 6a of the twisted pair wire A1. One end of the capacitor C2 is connected to the other end of the conducting wire 6b of the twisted pair wire A1. The other ends of the capacitors C1 and C2 are connected to the conversion circuit 80. The conversion circuit 80 is further connected to the extraction unit 81. The extraction unit 81 is further connected to the input unit 41 of the microcomputer 22. The conversion circuit 80 is grounded.
　キャパシタＣ１，Ｃ２のインダクタンスの絶対値は、周波数帯域が低い要求信号に対して大きく、周波数帯域が高い応答信号及びドア信号に対して小さい。従って、送信回路２０が送信アンテナＴ１に出力した要求信号が変換回路８０に入力されることはない。また、受信アンテナＲ１からツイストペア線Ａ１を介して変換回路８０に平衡な応答信号及びドア信号が入力される。 The absolute values of the inductances of the capacitors C1 and C2 are large for a request signal having a low frequency band and small for a response signal and a door signal having a high frequency band. Therefore, the request signal output from the transmission circuit 20 to the transmission antenna T1 is not input to the conversion circuit 80. Further, the balanced response signal and the door signal are input from the receiving antenna R1 to the conversion circuit 80 through the twisted pair wire A1.
　変換回路８０は、平衡な応答信号が入力された場合、入力された平衡な応答信号を、接地電位を基準とした不平衡な応答信号に変換し、変換した応答信号を抽出部８１に出力する。不平衡な信号は、固定電位、例えば接地電位を基準とした信号であり、シングルエンド信号とも呼ばれる。
　抽出部８１は、変換回路８０から応答信号が入力された場合、入力された応答信号から強度データを抽出し、抽出した強度データをマイコン２２の入力部４１に出力する。 When a balanced response signal is input, conversion circuit 80 converts the input balanced response signal into an unbalanced response signal based on the ground potential, and outputs the converted response signal to extraction section 81. . An unbalanced signal is a signal referenced to a fixed potential, eg ground, and is also referred to as a single ended signal.
When the response signal is input from the conversion circuit 80, the extraction unit 81 extracts intensity data from the input response signal, and outputs the extracted intensity data to the input unit 41 of the microcomputer 22.
　同様に、変換回路８０は、平衡なドア信号が入力された場合、平衡なドア信号を、接地電位を基準とした不平衡なドア信号に変換し、変換した応答信号を抽出部８１に出力する。
　抽出部８１は、変換回路８０からドア信号が入力された場合、入力されたドア信号から内容データを抽出し、抽出した内容データをマイコン２２の入力部４１に出力する。 Similarly, when a balanced door signal is input, conversion circuit 80 converts the balanced door signal into an unbalanced door signal based on the ground potential, and outputs the converted response signal to extraction unit 81. .
When a door signal is input from the conversion circuit 80, the extraction unit 81 extracts content data from the input door signal, and outputs the extracted content data to the input unit 41 of the microcomputer 22.
　図６は変換回路８０の回路図である。変換回路８０は３つのインダクタ９０，９１，９２を有する。キャパシタＣ１の他端は、インダクタ９０，９１夫々の一端に接続されている。キャパシタＣ２の他端は、インダクタ９２の一端に接続されている。３つのインダクタ９０，９１，９２夫々の他端は、接地されるとともに、抽出部８１に接続されている。 FIG. 6 is a circuit diagram of the conversion circuit 80. As shown in FIG. The conversion circuit 80 has three inductors 90, 91, 92. The other end of the capacitor C1 is connected to one end of each of the inductors 90 and 91. The other end of the capacitor C2 is connected to one end of the inductor 92. The other end of each of the three inductors 90, 91, 92 is grounded and connected to the extraction unit 81.
　３つのインダクタ９０，９１，９２は、例えば、環状をなす共通のコアに３つのコイルが巻回することによって形成され、相互に作用する。変換回路８０は、所謂、強制バランである。前述したように、キャパシタＣ１，Ｃ２の他端から入力された平衡な応答信号又はドア信号は、変換回路８０によって、不平衡な応答信号又はドア信号に変換される。 The three inductors 90, 91, 92 are formed, for example, by winding three coils on a common core forming an annular shape, and interact with each other. The conversion circuit 80 is a so-called forced balun. As described above, the balanced response signal or door signal input from the other end of the capacitors C1 and C2 is converted by the conversion circuit 80 into an unbalanced response signal or door signal.
　なお、変換回路８０は、３つのインダクタ９０，９１，９２を有する回路に限定されず、平衡な信号を不平衡な信号に変換する回路であればよい。 The conversion circuit 80 is not limited to a circuit having three inductors 90, 91 and 92, and may be any circuit that converts a balanced signal into an unbalanced signal.
　ツイストペア線Ａ２，Ａ３，・・・，Ａ５夫々はツイストペア線Ａ１と同様に構成される。送信アンテナＴ２，Ｔ３，・・・，Ｔ５夫々は送信アンテナＴ１と同様に構成される。ツイストペア線Ａ２，Ａ３，・・・，Ａ５夫々は、ツイストペア線Ａ１と同様に、送信アンテナＴ２，Ｔ３，・・・，Ｔ５のコイル７１に接続されるとともに、送信回路２０に接続されている。送信アンテナＴ２，Ｔ３，・・・，Ｔ５夫々は、送信アンテナＴ１と同様に作用する。 Each of the twisted pair wires A2, A3, ..., A5 is configured in the same manner as the twisted pair wire A1. Each of the transmitting antennas T2, T3, ..., T5 is configured in the same manner as the transmitting antenna T1. The twisted pair wires A2, A3, ..., A5 are connected to the coils 71 of the transmitting antennas T2, T3, ..., T5 as well as the twisted pair wire A1, and are connected to the transmitting circuit 20. Each of the transmitting antennas T2, T3, ..., T5 acts in the same manner as the transmitting antenna T1.
　車載装置２では、図５に示すように、送信回路２０がツイストペア線Ａ１を介して出力した要求信号は、送信アンテナＴ１によって、無線端末３に出力される。受信アンテナＲ１からツイストペア線Ａ１を介して出力された平衡な応答信号又はドア信号は、変換回路８０によって、不平衡な応答信号又はドア信号に変換される。不平衡な応答信号又はドア信号から、強度データ又は内容データが抽出部８１に抽出される。 In the on-vehicle apparatus 2, as shown in FIG. 5, the request signal output by the transmission circuit 20 via the twisted pair wire A1 is output to the wireless terminal 3 by the transmission antenna T1. The balanced response signal or door signal output from the receiving antenna R1 via the twisted wire pair A1 is converted by the conversion circuit 80 into an unbalanced response signal or door signal. From the unbalanced response signal or door signal, intensity data or content data is extracted by the extraction unit 81.
　以上のように、要求信号、応答信号及びドア信号の伝送に１つのツイストペア線Ａ１が用いられるため、車載装置２を実現するために必要な部品点数が少ない。送信アンテナＴ１は、無線の信号を遮蔽するか、又は、無線の信号の強度を減衰させる障害物が少ない場所に配置されている。送信アンテナＴ１の近傍に受信アンテナＲ１を配置することにより、障害物が少ない位置への受信アンテナＲ１の配置が実現される。 As described above, since one twisted pair wire A1 is used to transmit the request signal, the response signal, and the door signal, the number of parts required to realize the on-vehicle apparatus 2 is small. The transmitting antenna T1 is disposed at a place where there are few obstacles that shield the wireless signal or attenuate the wireless signal strength. By arranging the reception antenna R1 in the vicinity of the transmission antenna T1, the arrangement of the reception antenna R1 to a position with few obstacles is realized.
　なお、送信アンテナＴ１，Ｔ２，・・・，Ｔ５夫々は、バーアンテナに限定されず、信号を外部に出力することが可能なアンテナであればよい。また、受信アンテナＲ１は、ダイポールアンテナに限定されず、無線で送信された信号が入力されるアンテナであればよい。 Each of the transmitting antennas T1, T2,..., T5 is not limited to a bar antenna, and may be an antenna capable of outputting a signal to the outside. In addition, the receiving antenna R1 is not limited to a dipole antenna, and may be an antenna to which a signal transmitted by wireless is input.
　更に、受信アンテナＲ１が接続される送信アンテナは、送信アンテナＴ１に限定されず、送信回路２０にツイストペア線を介して接続される送信アンテナであればよい。送信アンテナの数は、５に限定されず、１、２、３、４又は６以上であってもよい。 Furthermore, the transmission antenna to which the reception antenna R1 is connected is not limited to the transmission antenna T1, and may be a transmission antenna connected to the transmission circuit 20 via a twisted pair line. The number of transmitting antennas is not limited to five, and may be one, two, three, four or six or more.
　また、受信アンテナの数は、１に限定されず、２以上であってもよい。この場合、複数の受信アンテナ夫々は、複数の送信アンテナに接続される。例えば、各送信アンテナに受信アンテナが接続されてもよい。複数の受信アンテナが設けられている場合、ダイバーシティと呼ばれる技術が用いられる。従って、複数の受信アンテナに入力された複数の信号を１つの信号に合成する処理、又は、複数の受信アンテナに入力された複数の信号の中から信号強度が最も高い信号を選択する処理等が行われる。 Further, the number of receiving antennas is not limited to one, and may be two or more. In this case, each of the plurality of receive antennas is connected to the plurality of transmit antennas. For example, a receiving antenna may be connected to each transmitting antenna. When multiple receive antennas are provided, a technique called diversity is used. Therefore, a process of combining a plurality of signals input to a plurality of receiving antennas into one signal, or a process of selecting a signal having the highest signal strength among a plurality of signals input to a plurality of receiving antennas, etc. To be done.
　受信アンテナが接続される接続機器は、送信アンテナに限定されず、ツイストペア線を介して、周波数帯域が応答信号及びドア信号の周波数帯域と異なる信号を出力する機器であればよい。接続機器は、例えば、スピーカであってもよい。この場合、スピーカには、ベースバンド信号がツイストペア線を介して出力される。ベースバンド信号の周波数帯域は、応答信号及びドア信号の周波数帯域と異なる。 The connection device to which the reception antenna is connected is not limited to the transmission antenna, and may be any device that outputs a signal whose frequency band is different from that of the response signal and the door signal through the twisted pair wire. The connection device may be, for example, a speaker. In this case, a baseband signal is output to the speaker via the twisted pair wire. The frequency band of the baseband signal is different from the frequency band of the response signal and the door signal.
　開示された本実施形態はすべての点で例示であって、制限的なものではないと考えられるべきである。本発明の範囲は、上述した意味ではなく、請求の範囲によって示され、請求の範囲と均等の意味及び範囲内でのすべての変更が含まれることが意図される。 The disclosed embodiments are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is indicated not by the meaning described above but by the scope of the claims, and is intended to include all modifications within the scope and meaning equivalent to the scope of the claims.
　１　通信システム
　２　車載装置
　２０　送信回路
　２１　受信回路
　２２　マイコン
　３　無線端末
　４０　出力部
　４１　入力部
　４２　入出力部
　４３　記憶部
　４４　制御部
　４５　バス
　５ａ，５ｂ　エレメント
　６ａ，６ｂ　導線
　７０　コア
　７１　コイル
　８０　変換回路
　８１　抽出部
　９０，９１，９２　インダクタ
　２００　車両
　Ａ１，Ａ２，・・・，Ａ５　ツイストペア線
　Ｃ１，Ｃ２，Ｃａ，Ｃｂ　キャパシタ
　Ｐ２　コンピュータプログラム
　Ｒ１　受信アンテナ
　Ｔ１，Ｔ２，・・・，Ｔ５　送信アンテナ Reference Signs List 1 communication system 2 in-vehicle device 20 transmission circuit 21 reception circuit 22 microcomputer 3 wireless terminal 40 output unit 41 input unit 42 input / output unit 43 storage unit 44 control unit 45 bus 5a, 5b element 6a, 6b lead 70 core 71 coil 80 conversion circuit 81 Extraction Unit 90, 91, 92 Inductor 200 Vehicle A1, A2, ..., A5 Twisted Pair Wire C1, C2, Ca, Cb Capacitor P2 Computer Program R1 Reception Antenna T1, T2, ..., T5 Transmission Antenna

Claims (4)

  1. 　ツイストペア線を介して第１信号が出力される車載装置であって、
    　周波数帯域が前記第１信号の周波数帯域と異なる第２信号が入力され、入力された該第２信号を、前記ツイストペア線を介して出力する受信アンテナを備える
    　車載装置。     An on-vehicle apparatus to which a first signal is output via a twisted pair wire,
    A vehicle-mounted device comprising: a reception antenna which receives a second signal whose frequency band is different from the frequency band of the first signal and which outputs the input second signal via the twisted pair line.
  2. 　前記受信アンテナは、平衡な前記第２信号を、前記ツイストペア線を介して出力し、
    　前記ツイストペア線を介して平衡な前記第２信号が入力され、入力された平衡な該第２信号を不平衡な該第２信号に変換する変換回路を備える
    　請求項１に記載の車載装置。     The receiving antenna outputs the balanced second signal via the twisted pair wire,
    The on-vehicle apparatus according to claim 1, further comprising: a conversion circuit which receives the balanced second signal via the twisted pair and converts the balanced second signal input into the unbalanced second signal.
  3. 　前記ツイストペア線を介して前記第１信号が入力され、入力された該第１信号を無線で出力する送信アンテナを備える
    　請求項１又は請求項２に記載の車載装置。     The on-vehicle apparatus according to claim 1 or 2, further comprising: a transmission antenna that receives the first signal via the twisted pair and outputs the received first signal wirelessly.
  4. 　前記第１信号は前記第２信号の送信を要求する信号であり、
    　前記受信アンテナに前記第２信号が入力された場合に車両に関する動作の実行を指示する指示データを出力する出力部を備える
    　請求項３に記載の車載装置。     The first signal is a signal requesting transmission of the second signal,
    The in-vehicle apparatus according to claim 3, further comprising an output unit that outputs instruction data instructing execution of an operation related to a vehicle when the second signal is input to the reception antenna.
PCT/JP2018/032994 2017-09-19 2018-09-06 In-vehicle device WO2019058982A1 (en)

Applications Claiming Priority (2)

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JP2017-179179 2017-09-19
JP2017179179A JP2019054495A (en) 2017-09-19 2017-09-19 On-vehicle device

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002077972A (en) * 2000-08-30 2002-03-15 Omron Corp Wireless system
JP2006041652A (en) * 2004-07-23 2006-02-09 Mitsubishi Electric Corp High frequency magnetic field generator
JP2010212960A (en) * 2009-03-10 2010-09-24 Autonetworks Technologies Ltd Transmitter of vehicle antenna
JP2016115982A (en) * 2014-12-11 2016-06-23 株式会社オートネットワーク技術研究所 On-vehicle antenna

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002077972A (en) * 2000-08-30 2002-03-15 Omron Corp Wireless system
JP2006041652A (en) * 2004-07-23 2006-02-09 Mitsubishi Electric Corp High frequency magnetic field generator
JP2010212960A (en) * 2009-03-10 2010-09-24 Autonetworks Technologies Ltd Transmitter of vehicle antenna
JP2016115982A (en) * 2014-12-11 2016-06-23 株式会社オートネットワーク技術研究所 On-vehicle antenna

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