JP7094623B2

JP7094623B2 - Vehicle detectors and vehicle detection systems

Info

Publication number: JP7094623B2
Application number: JP2018074592A
Authority: JP
Inventors: 靖裕小湊
Original assignee: Yazaki Corp
Current assignee: Yazaki Corp
Priority date: 2018-04-09
Filing date: 2018-04-09
Publication date: 2022-07-04
Anticipated expiration: 2038-04-09
Also published as: JP2019186722A

Description

本発明は、車両用検出器及び車両用検出システムに関する。 The present invention relates to a vehicle detector and a vehicle detection system.

従来、車両に搭載され、当該車両の搭乗者の動作により変化する車内の状態を検出する車両用検出システムがある。車両用検出システムは、例えば、搭乗者の座席への着座状態を検出する着座センサや座席に設けられたシートベルトの装着状態を検出するバックルセンサ等の車両用検出器を備えるものがある。例えば、特許文献１では、乗員の着座を検知するセンサと、センサによって検知した検知信号を無線通信によって送信し、無線給電によってセンサに電力を供給する通信装置とを備えるメンブレンスイッチが提案されている。 Conventionally, there is a vehicle detection system that is mounted on a vehicle and detects a state inside the vehicle that changes depending on the movement of the passenger of the vehicle. Some vehicle detection systems include, for example, a vehicle detector such as a seating sensor that detects a occupant's seating state in a seat and a buckle sensor that detects a seatbelt wearing state provided in a seat. For example, Patent Document 1 proposes a membrane switch including a sensor that detects the seating of an occupant and a communication device that transmits a detection signal detected by the sensor by wireless communication and supplies power to the sensor by wireless power supply. ..

特開２０１５－２０４４７号公報Japanese Unexamined Patent Publication No. 2015-20447

ところで、車両内で着座センサやバックルセンサに無線給電を行う場合、通信環境の変化等により十分な無線給電が行えないおそれがある。また、着座センサにメンブレンスイッチ等の感圧式スイッチを用いた場合、接点の接触抵抗の増加により消費電力が増えて、センサの検出精度が十分に得られない可能性がある。 By the way, when wireless power supply is performed to the seating sensor and the buckle sensor in the vehicle, there is a possibility that sufficient wireless power supply cannot be performed due to changes in the communication environment or the like. Further, when a pressure-sensitive switch such as a membrane switch is used for the seating sensor, the power consumption increases due to the increase in the contact resistance of the contacts, and the detection accuracy of the sensor may not be sufficiently obtained.

本発明は、上記課題に鑑みてなされたものであり、検出精度を向上させることができる車両用検出器及び車両用検出システムを提供することを目的とする。 The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicle detector and a vehicle detection system capable of improving the detection accuracy.

上記目的を達成するために、本発明に係る車両用検出器は、車両内の状態を検出する車両用検出器であって、前記車両に設けられたリーダとの間で相互に無線信号を送受信し、少なくとも電力供給用の無線信号を含む送信信号を受信するアンテナ部と、少なくとも前記アンテナ部により受信された前記送信信号に含まれる前記電力供給用の無線信号を動力として駆動する制御部と、前記制御部に電気的に接続され、前記車両内の座席への搭乗者の着座状態に応じてＯＮ状態又はＯＦＦ状態に切り替わる第１スイッチ回路と、前記制御部に電気的に接続され、前記座席のシートベルトの装着状態に応じてＯＮ状態又はＯＦＦ状態に切り替わる第２スイッチ回路と、前記制御部を駆動する電力を供給する電源部とを備え、前記電源部は、発電素子と、前記発電素子により発電された電力を蓄電する蓄電部とを有し、前記制御部は、前記第１スイッチ回路のＯＮ状態に応じて第１検出信号を前記アンテナ部に出力し、前記第２スイッチ回路のＯＮ状態に応じて第２検出信号を前記アンテナ部に出力し、前記第１スイッチ回路は、第１可撓性シートと、前記第１可撓性シートに対向して配置された第２可撓性シートと、電気絶縁性を有し、前記第１可撓性シートと前記第２可撓性シートとの間に介在する絶縁シートとを有し、前記第１可撓性シートは、前記制御部に電気的に接続され、かつ前記第２可撓性シートに対向する第１対向面に形成された一対の第１接点部を有し、前記第２可撓性シートは、前記第１可撓性シートに対向する第２対向面に形成された第２接点部を有し、前記絶縁シートは、一対の前記第１接点部と前記第２接点部とが対向する位置において、前記第１対向面から前記第２対向面まで貫通する貫通孔を有し、一対の前記第１接点部及び前記第２接点部は、前記搭乗者の着座に基づく外力により各前記第１接点部に対して前記第２接点部を重ね合わせた状態で相互に接触して前記ＯＮ状態となり、前記アンテナ部は、前記第１対向面に環状に形成されており、巻回し開始側の始端部が一対の前記第１接点部の一方に形成され、巻回し終了側の終端部が一対の前記第１接点部の他方に形成される、ことを特徴とする。 In order to achieve the above object, the vehicle detector according to the present invention is a vehicle detector that detects a state inside the vehicle, and transmits and receives radio signals to and from a reader provided in the vehicle. An antenna unit that receives at least a transmission signal including a radio signal for power supply, and a control unit that drives the radio signal for power supply included in the transmission signal received by at least the antenna unit as a power source. A first switch circuit that is electrically connected to the control unit and switches to an ON state or an OFF state depending on the seated state of the occupant in the seat in the vehicle, and the seat that is electrically connected to the control unit. The power supply unit includes a second switch circuit that switches to an ON state or an OFF state according to the wearing state of the seat belt, and a power supply unit that supplies power to drive the control unit. The power supply unit includes a power generation element and the power generation element. It has a power storage unit for storing the electric power generated by the above, and the control unit outputs a first detection signal to the antenna unit according to the ON state of the first switch circuit, and turns on the second switch circuit. A second detection signal is output to the antenna unit according to the state, and the first switch circuit has a first flexible sheet and a second flexibility arranged so as to face the first flexible sheet. It has a sheet and an insulating sheet that has electrical insulation and is interposed between the first flexible sheet and the second flexible sheet, and the first flexible sheet is the control unit. The second flexible sheet has a pair of first contact portions electrically connected to and formed on a first facing surface facing the second flexible sheet, and the second flexible sheet is the first flexible sheet. The insulating sheet has a second contact portion formed on a second facing surface facing the sex sheet, and the insulating sheet has the first facing portion at a position where the pair of the first contact portions and the second contact portion face each other. The pair of the first contact portions and the second contact portions have through holes penetrating from the surface to the second facing surface, and the pair of the first contact portions and the second contact portions are described with respect to each of the first contact portions by an external force based on the seating of the occupant. The second contact portions are in contact with each other in a superposed state to be in the ON state, and the antenna portion is formed in an annular shape on the first facing surface, and the starting end portion on the winding start side is a pair of the first portions. It is characterized in that it is formed on one of the one contact portions, and the end portion on the winding end side is formed on the other of the pair of the first contact portions .

上記目的を達成するために、本発明に係る車両用検出システムは、車両用検出器と、車両に設けられ、前記車両用検出器との間で相互に無線信号を送受信し、少なくとも電力供給用の無線信号を含む送信信号を送信し第１検出信号及び第２検出信号を受信するリーダとを備え、前記リーダは、前記第１検出信号に基づいて前記座席への前記搭乗者の着座状態を判定し、かつ前記第２検出信号に基づいて前記シートベルトの装着状態を判定し、前記搭乗者が着座状態であり、かつ前記シートベルトが未装着である場合には警告信号を出力する判定部と、前記警告信号に応じて前記搭乗者に警告を行う報知部とを有する、ことを特徴とする。
上記車両用検出システムにおいて、前記車両用検出器は、前記第１スイッチ回路がＯＮ状態である場合、前記制御部から前記アンテナ部を介して前記第１検出信号を前記リーダに送信する一方、前記第１スイッチ回路がＯＦＦ状態である場合、前記制御部から前記第１検出信号を前記リーダに送信せず、前記第２スイッチ回路がＯＮ状態である場合、前記制御部から前記アンテナ部を介して前記第２検出信号を前記リーダに送信する一方、前記第２スイッチ回路がＯＦＦ状態である場合、前記制御部から前記第２検出信号を前記リーダに送信せず、前記判定部は、前記車両用検出器から前記第１検出信号を受信し、かつ前記第２検出信号を受信しない場合には、前記搭乗者が着座状態であり、かつ前記シートベルトが未装着であると判定して前記警告信号を出力する。 In order to achieve the above object, the vehicle detection system according to the present invention transmits and receives radio signals to and from each other between the vehicle detector and the vehicle detector provided in the vehicle, and at least for power supply. The reader comprises a reader that transmits a transmission signal including a radio signal of the above and receives a first detection signal and a second detection signal, and the reader determines the seated state of the passenger in the seat based on the first detection signal. A determination unit that makes a determination and determines the seatbelt wearing state based on the second detection signal, and outputs a warning signal when the passenger is in the seated state and the seatbelt is not fastened. It is characterized by having a notification unit for giving a warning to the passenger in response to the warning signal.
In the vehicle detection system, when the first switch circuit is in the ON state, the vehicle detector transmits the first detection signal from the control unit to the reader via the antenna unit, while the vehicle detector transmits the first detection signal to the reader. When the first switch circuit is in the OFF state, the control unit does not transmit the first detection signal to the reader, and when the second switch circuit is in the ON state, the control unit passes through the antenna unit. While the second detection signal is transmitted to the reader, when the second switch circuit is in the OFF state, the control unit does not transmit the second detection signal to the reader, and the determination unit is for the vehicle. When the first detection signal is received from the detector and the second detection signal is not received, it is determined that the passenger is in the seated state and the seat belt is not worn, and the warning signal is given. Is output.

本発明に係る車両検出器及び車両用検出システムによれば、検出精度を向上させることができるという効果を奏する。 According to the vehicle detector and the vehicle detection system according to the present invention, there is an effect that the detection accuracy can be improved.

図１は、実施形態に係る車両用検出システムの構成例を示すブロック図である。FIG. 1 is a block diagram showing a configuration example of a vehicle detection system according to an embodiment. 図２は、実施形態に係る車両用検出器の構成例を示すブロック図である。FIG. 2 is a block diagram showing a configuration example of the vehicle detector according to the embodiment. 図３は、実施形態に係る車両用検出システムの設置例を示す概略図である。FIG. 3 is a schematic view showing an installation example of the vehicle detection system according to the embodiment. 図４は、実施形態に係る車両用検出器の構成例を示す分解図である。FIG. 4 is an exploded view showing a configuration example of the vehicle detector according to the embodiment. 図５は、実施形態に係る車両用検出器の構成例を示す部分拡大図である。FIG. 5 is a partially enlarged view showing a configuration example of the vehicle detector according to the embodiment. 図６は、実施形態に係る車両用検出器の構成例を示す部分断面図である。FIG. 6 is a partial cross-sectional view showing a configuration example of the vehicle detector according to the embodiment. 図７は、実施形態に係る車両用検出器の状態変化の一例を示す部分断面図である。FIG. 7 is a partial cross-sectional view showing an example of a state change of the vehicle detector according to the embodiment. 図８は、実施形態に係る車両用検出システムの動作例を示すフローチャートである。FIG. 8 is a flowchart showing an operation example of the vehicle detection system according to the embodiment. 図９は、実施形態に係る車両用検出システムにおける警告例を示す図である。FIG. 9 is a diagram showing an example of a warning in the vehicle detection system according to the embodiment.

以下に、本発明に係る車両用検出器及び車両用検出システムについて図面を参照しつつ詳細に説明する。なお、下記実施形態により本発明が限定されるものではない。また、下記実施形態における構成要素には、当業者が容易に想定できるもの、あるいは実質的に同一のものが含まれる。また、下記実施形態における構成要素は、発明の要旨を逸脱しない範囲で、種々の省略、置き換え、変更を行うことができる。 Hereinafter, the vehicle detector and the vehicle detection system according to the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following embodiments. Further, the components in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same. In addition, the components in the following embodiments can be omitted, replaced, or modified in various ways without departing from the gist of the invention.

［実施形態］
車両用検出システム１は、自動車等の車両２に設けられる。車両２は、図３に示すように、例えば車室２ｂ内に前後方向に３列、左右方向に２又は３列に配列された複数の座席２ａを備える。各座席２ａには、シートベルト（不図示）と、当該シートベルトを固定するためのバックル２５とが設けられる。車両用検出システム１は、車室２ｂ内の複数の座席２ａへの搭乗者の着座状態を判定し、一定の条件を満たさない場合には、着座している搭乗者に対して報知を行うものである。例えば、車両用検出システム１は、着座している搭乗者がシートベルトを装着していない場合、シートベルトの装着を促すように当該搭乗者に警告を行うものである。本実施形態の車両用検出システム１は、図１に示すように、リーダ１０と、複数の検出器２０とを備える。車両用検出システム１は、リーダ１０と複数の検出器２０との間において、ＲＦＩＤ（ＲａｄｉｏＦｒｅｑｕｅｎｃｙＩｄｎｔｉｆｉｅｒ）による通信技術を用いて近距離無線通信を行う。 [Embodiment]
The vehicle detection system 1 is provided in a vehicle 2 such as an automobile. As shown in FIG. 3, the vehicle 2 includes, for example, a plurality of seats 2a arranged in three rows in the front-rear direction and two or three rows in the left-right direction in the passenger compartment 2b. Each seat 2a is provided with a seat belt (not shown) and a buckle 25 for fixing the seat belt. The vehicle detection system 1 determines the seated state of a occupant in a plurality of seats 2a in the passenger compartment 2b, and if a certain condition is not satisfied, notifies the occupant who is seated. Is. For example, if the seated passenger is not wearing a seatbelt, the vehicle detection system 1 warns the passenger to wear the seatbelt. As shown in FIG. 1, the vehicle detection system 1 of the present embodiment includes a reader 10 and a plurality of detectors 20. The vehicle detection system 1 performs short-range wireless communication between the reader 10 and the plurality of detectors 20 by using a communication technique by RFID (Radio Frequency Indicator).

なお、以下の説明では、図３に示すように、車両２における車両前後方向は、車両２の全長方向に相当する。車両前後方向において、車両２が前進する側を前方、車両２が後進する側を後方という場合がある。車両左右方向は、車両２の全幅方向に相当する。車両左右方向において、車両前後方向の前方に向かって左側を左側、車両前後方向の前方に向かって右側を右側という場合がある。車両前後方向と車両左右方向とは、相互に直交し、車両２が水平面に位置する状態で、車両前後方向、車両左右方向が水平方向に沿う。また、図４～図７において、互いに交差するＸ方向、Ｙ方向、及び、Ｚ方向のうち、Ｘ方向を「奥行方向」とし、Ｙ方向を「幅方向」とし、Ｚ方向を「上下方向」とする。なお、Ｚ方向は、必ずしも鉛直方向と一致するものではない。 In the following description, as shown in FIG. 3, the vehicle front-rear direction in the vehicle 2 corresponds to the total length direction of the vehicle 2. In the front-rear direction of the vehicle, the side in which the vehicle 2 moves forward may be referred to as the front, and the side in which the vehicle 2 moves backward may be referred to as the rear. The vehicle left-right direction corresponds to the overall width direction of the vehicle 2. In the vehicle left-right direction, the left side may be referred to as the left side when facing the front in the vehicle front-rear direction, and the right side may be referred to as the right side when facing the front in the vehicle front-rear direction. The vehicle front-rear direction and the vehicle left-right direction are orthogonal to each other, and the vehicle front-rear direction and the vehicle left-right direction are along the horizontal direction in a state where the vehicle 2 is located on the horizontal plane. Further, in FIGS. 4 to 7, of the X, Y, and Z directions that intersect each other, the X direction is the "depth direction", the Y direction is the "width direction", and the Z direction is the "vertical direction". And. The Z direction does not always coincide with the vertical direction.

リーダ１０は、車両２に設けられる。リーダ１０は、例えば、図３に示すように、車室２ｂ内のインナールーフ２ｃの車両前方側の端部に配置される。なお、リーダ１０の配置位置は、インナールーフ２ｃの車両前方側の端部に限定されるものではなく、インストルメントパネル（不図示）やインナールーフ２ｃの中央に配置されていてもよい。リーダ１０は、車室２ｂ内に定期的に電波を放射して、各座席２ａに配置された複数の検出器２０との間で無線信号を送受信する。リーダ１０は、例えば、パッシブ方式のＲＦＩＤに対応しており、電波（搬送波）を送信することで各検出器２０に電力を供給し、当該電波に対する反射波（副搬送波）を検出器２０から受信する。リーダ１０は、図１に示すように、第１アンテナ部１１と、送受信部１２と、コントローラ１３と、報知部１４とを備える。 The reader 10 is provided in the vehicle 2. As shown in FIG. 3, for example, the reader 10 is arranged at the end of the inner roof 2c in the vehicle interior 2b on the front side of the vehicle. The position of the reader 10 is not limited to the end portion of the inner roof 2c on the front side of the vehicle, and may be arranged in the center of the instrument panel (not shown) or the inner roof 2c. The reader 10 periodically radiates radio waves into the vehicle interior 2b to transmit and receive radio signals to and from a plurality of detectors 20 arranged in each seat 2a. The reader 10 is compatible with, for example, a passive RFID, and supplies power to each detector 20 by transmitting a radio wave (carrier wave), and receives a reflected wave (subcarrier) for the radio wave from the detector 20. do. As shown in FIG. 1, the reader 10 includes a first antenna unit 11, a transmission / reception unit 12, a controller 13, and a notification unit 14.

第１アンテナ部１１は、ＵＨＦ帯やマイクロ波等の高周波を利用した電波方式による無線信号（電波）を送受信するものである。第１アンテナ部１１は、送受信部１２に電気的に接続され、送受信部１２から出力される電力供給用の無線信号、及び、搬送波を含む送信信号（以下、単に「送信信号」とも呼ぶ。）を各検出器２０に送信する。送信信号には、電力供給用の無線信号の他に、各検出器２０に向けた制御信号等を含んでもよい。第１アンテナ部１１は、各検出器２０から送信される検出信号を受信し、当該検出信号を送受信部１２に出力する。ここで、検出信号は、各検出器２０に割り当てられた識別情報を含む無線信号である。この識別情報は、いわゆるタグＩＤと呼ばれ、検出器２０毎に異なる固有のＩＤである。 The first antenna unit 11 transmits / receives a radio signal (radio wave) by a radio wave method using a high frequency such as a UHF band or a microwave. The first antenna unit 11 is electrically connected to the transmission / reception unit 12, and is a radio signal for power supply output from the transmission / reception unit 12 and a transmission signal including a carrier wave (hereinafter, also simply referred to as “transmission signal”). Is transmitted to each detector 20. The transmission signal may include a control signal or the like directed to each detector 20 in addition to the radio signal for power supply. The first antenna unit 11 receives the detection signal transmitted from each detector 20 and outputs the detection signal to the transmission / reception unit 12. Here, the detection signal is a radio signal including the identification information assigned to each detector 20. This identification information is a so-called tag ID, which is a unique ID different for each detector 20.

送受信部１２は、第１アンテナ部１１に電気的に接続され、当該第１アンテナ部１１を介して無線信号を送受信する。送受信部１２は、例えば、上述した送信信号を、第１アンテナ部１１を介して送信する。また、送受信部１２は、第１アンテナ部１１を介して、各検出器２０から送信される検出信号を受信する。送受信部１２は、受信した検出信号を復調してコントローラ１３に出力する。 The transmission / reception unit 12 is electrically connected to the first antenna unit 11 and transmits / receives a wireless signal via the first antenna unit 11. The transmission / reception unit 12 transmits, for example, the above-mentioned transmission signal via the first antenna unit 11. Further, the transmission / reception unit 12 receives the detection signal transmitted from each detector 20 via the first antenna unit 11. The transmission / reception unit 12 demodulates the received detection signal and outputs it to the controller 13.

コントローラ１３は、送受信部１２及び報知部１４に電気的に接続され、これらを制御するものである。コントローラ１３は、例えば、ＣＰＵ、ＲＯＭ、ＲＡＭ及びインターフェースを含む周知のマイクロコンピュータを主体とする電子回路を含んで構成される。コントローラ１３は、例えば、送信信号を所定間隔（例えば１秒間隔）で各検出器２０に送信するように送受信部１２を制御する。コントローラ１３は、判定部として、送受信部１２が各検出器２０から受信した検出信号（第１検出信号、第２検出信号）に基づいて車室２ｂ内の各座席２ａの着座状態を判定する。本実施形態では、各座席２ａに１つの検出器２０が配置されており、当該検出器２０から得られる第１検出信号及び第２検出信号に基づいて搭乗者の着座判定、及び、シートベルトの装着判定が行われる。コントローラ１３は、受信した第１検出信号に含まれる識別情報に基づいて座席２ａの位置を特定し、当該座席２ａへの搭乗者の着座状態を判定する。また、コントローラ１３は、受信した第２検出信号に含まれる識別情報に基づいて座席２ａの位置を特定し、当該座席２ａに設けられたシートベルトの装着状態を判定する。コントローラ１３は、第１検出信号に基づいて座席２ａへの搭乗者の着座状態を判定し、かつ第２検出信号に基づいてシートベルトの装着状態を判定して、搭乗者が着座状態であり、かつシートベルトが未装着状態である場合には、報知部１４に警告信号を出力する。コントローラ１３は、車両２全体を制御する不図示のＥＣＵ（ＥｌｅｃｔｒｏｎｉｃＣｏｎｔｒｏｌＵｎｉｔ；電子制御ユニット）に電気的に接続され、当該ＥＣＵからＡＣＣ（Ａｃｃｅｓｓｏｒｙ）電源又はＩＧ（Ｉｇｎｉｔｉｏｎ）電源のＯＮ／ＯＦＦ情報を取得することができる。 The controller 13 is electrically connected to the transmission / reception unit 12 and the notification unit 14 and controls them. The controller 13 includes, for example, an electronic circuit mainly composed of a well-known microcomputer including a CPU, a ROM, a RAM, and an interface. The controller 13 controls the transmission / reception unit 12 so as to transmit the transmission signal to each detector 20 at predetermined intervals (for example, 1 second interval). As a determination unit, the controller 13 determines the seated state of each seat 2a in the vehicle interior 2b based on the detection signals (first detection signal, second detection signal) received from each detector 20 by the transmission / reception unit 12. In the present embodiment, one detector 20 is arranged in each seat 2a, and the seating determination of the occupant and the seat belt are determined based on the first detection signal and the second detection signal obtained from the detector 20. The mounting judgment is made. The controller 13 identifies the position of the seat 2a based on the identification information included in the received first detection signal, and determines the seated state of the passenger in the seat 2a. Further, the controller 13 identifies the position of the seat 2a based on the identification information included in the received second detection signal, and determines the wearing state of the seat belt provided on the seat 2a. The controller 13 determines the seated state of the occupant on the seat 2a based on the first detection signal, and determines the seatbelt wearing state based on the second detection signal, so that the occupant is in the seated state. If the seatbelt is not fastened, a warning signal is output to the notification unit 14. The controller 13 is electrically connected to an ECU (Electronic Control Unit) (not shown) that controls the entire vehicle 2, and ON / OFF information of an ACC (Accessory) power supply or an IG (Ignition) power supply is transmitted from the ECU. Can be obtained.

報知部１４は、コントローラ１３から出力された警告信号に応じて搭乗者に警告を行う。報知部１４は、例えば、それぞれが指向性を有する光を警告光として発する警告ランプであり、複数のＬＥＤ（ＬｉｇｈｔＥｍｉｔｔｉｎｇＤｉｏｄｅ）等で構成される。警告光は、少なくとも搭乗者の視覚に訴求する単純光であり、例えば、赤色光である。報知部１４は、各光軸が各座席２ａへの搭乗者のアイポイントＥＰに向かうように配置される。 The notification unit 14 warns the passenger in response to the warning signal output from the controller 13. The notification unit 14 is, for example, a warning lamp that emits light having directivity as warning light, and is composed of a plurality of LEDs (Light Emitting Diodes) and the like. The warning light is at least a simple light that appeals to the occupant's vision, for example, a red light. The notification unit 14 is arranged so that each optical axis faces the occupant's eye point EP to each seat 2a.

各検出器２０は、車両用検出器であり、車両２に設けられ、リーダ１０との間で無線信号を送受信し、車両２内の状態を検出して検出信号を送信する。各検出器２０は、座席２ａへの搭乗者の着座状態を検出し、リーダ１０に対して第１検出信号を送信する。また、各検出器２０は、座席２ａのシートベルトの装着状態を検出し、リーダ１０に対して第２検出信号を送信する。各検出器２０は、リーダ１０から送信される電力供給用の無線信号を動力として駆動するパッシブ方式のＲＦＩＤを用いた機器である。各検出器２０は、図１に示すように、第２アンテナ部２１と、検出部２３と、電源部２４とを備える。 Each detector 20 is a vehicle detector, is provided in the vehicle 2, transmits and receives a wireless signal to and from the reader 10, detects a state in the vehicle 2, and transmits a detection signal. Each detector 20 detects the seated state of the occupant on the seat 2a and transmits the first detection signal to the reader 10. Further, each detector 20 detects the wearing state of the seat belt of the seat 2a and transmits a second detection signal to the reader 10. Each detector 20 is a device using a passive RFID that is driven by a radio signal for power supply transmitted from the reader 10. As shown in FIG. 1, each detector 20 includes a second antenna unit 21, a detection unit 23, and a power supply unit 24.

第２アンテナ部２１は、アンテナ部であり、ＵＨＦ帯やマイクロ波等の高周波を利用した電波方式による無線信号（電波）を送受信するものである。第２アンテナ部２１は、検出部２３に電気的に接続され、リーダ１０から送信信号を受信する。第２アンテナ部２１は、受信した送信信号を検出部２３に出力する。また、第２アンテナ部２１は、検出部２３から出力される検出信号をリーダ１０に送信する。 The second antenna unit 21 is an antenna unit and transmits / receives a radio signal (radio wave) by a radio wave method using a high frequency such as a UHF band or a microwave. The second antenna unit 21 is electrically connected to the detection unit 23 and receives a transmission signal from the reader 10. The second antenna unit 21 outputs the received transmission signal to the detection unit 23. Further, the second antenna unit 21 transmits the detection signal output from the detection unit 23 to the reader 10.

検出部２３は、座席２ａへの搭乗者の着座状態、及び、当該座席２ａのシートベルトの装着状態を検出し、検出結果に応じて第１検出信号及び第２検出信号の少なくとも一方を出力する回路である。検出部２３は、電源部２４に電気的に接続され、リーダ１０から送信された電力供給用の無線信号を動力として駆動すると共に、当該電源部２４から供給される電力により駆動する。検出部２３は、図２に示すように、制御部２３ａと、第１スイッチ回路２３ｂと、第２スイッチ回路２３ｃとを有する。 The detection unit 23 detects the seated state of the occupant on the seat 2a and the wearing state of the seat belt of the seat 2a, and outputs at least one of the first detection signal and the second detection signal according to the detection result. It is a circuit. The detection unit 23 is electrically connected to the power supply unit 24, is driven by a wireless signal for power supply transmitted from the reader 10, and is driven by the power supplied from the power supply unit 24. As shown in FIG. 2, the detection unit 23 includes a control unit 23a, a first switch circuit 23b, and a second switch circuit 23c.

制御部２３ａは、第１スイッチ回路２３ｂ、及び、第２スイッチ回路２３ｃに電気的に接続されている。制御部２３ａは、例えばＩＣ回路等で構成される。制御部２３ａは、リーダ１０から送信された電力供給用の無線信号及び電源部２４から供給される電力の少なくとも一方により駆動する。制御部２３ａは、第１スイッチ回路２３ｂの抵抗（または第１スイッチ回路２３ｂを流れる電流）を監視し、当該抵抗の変化（または電流の変化）に応じて当該第１スイッチ回路２３ｂのＯＮ状態／ＯＦＦ状態を判別する。制御部２３ａは、第１スイッチ回路２３ｂのＯＮ状態に応じて第１検出信号を第２アンテナ部２１に出力する。制御部２３ａは、第２スイッチ回路２３ｃの抵抗（または第２スイッチ回路２３ｃを流れる電流）を監視し、当該抵抗の変化（または電流の変化）に応じて当該第２スイッチ回路２３ｃのＯＮ状態／ＯＦＦ状態を判別する。制御部２３ａは、第２スイッチ回路２３ｃのＯＮ状態に応じて第２検出信号を第２アンテナ部２１に出力する。 The control unit 23a is electrically connected to the first switch circuit 23b and the second switch circuit 23c. The control unit 23a is composed of, for example, an IC circuit or the like. The control unit 23a is driven by at least one of a radio signal for power supply transmitted from the reader 10 and power supplied from the power supply unit 24. The control unit 23a monitors the resistance of the first switch circuit 23b (or the current flowing through the first switch circuit 23b), and the ON state of the first switch circuit 23b / according to the change in the resistance (or the change in the current). Determine the OFF state. The control unit 23a outputs the first detection signal to the second antenna unit 21 according to the ON state of the first switch circuit 23b. The control unit 23a monitors the resistance of the second switch circuit 23c (or the current flowing through the second switch circuit 23c), and the ON state of the second switch circuit 23c / according to the change in the resistance (or the change in the current). Determine the OFF state. The control unit 23a outputs a second detection signal to the second antenna unit 21 according to the ON state of the second switch circuit 23c.

第１スイッチ回路２３ｂは、いわゆる着座センサ（着座ＳＷ）であり、座席２ａの座面部２ａａに配置されている。第１スイッチ回路２３ｂは、制御部２３ａに電気的に接続され、車室２ｂ内の座席２ａへの搭乗者の着座状態に応じてＯＮ状態又はＯＦＦ状態に切り替わる。なお、第１スイッチ回路２３ｂの詳細な構造については後述する。 The first switch circuit 23b is a so-called seating sensor (seat SW), and is arranged on the seat surface portion 2aa of the seat 2a. The first switch circuit 23b is electrically connected to the control unit 23a and switches to an ON state or an OFF state according to the seated state of the occupant in the seat 2a in the passenger compartment 2b. The detailed structure of the first switch circuit 23b will be described later.

第２スイッチ回路２３ｃは、いわゆるバックルセンサ（バックルＳＷ）であり、バックル２５に設けられている。第２スイッチ回路２３ｃは、制御部２３ａに電気的に接続され、座席２ａのシートベルトの装着状態に応じてＯＮ状態又はＯＦＦ状態に切り替わる。第２スイッチ回路２３ｃは、シートベルトのタングプレート（不図示）とバックル２５とが締結された場合に、ＯＦＦ状態からＯＮ状態に切り替わるように配置されている。 The second switch circuit 23c is a so-called buckle sensor (buckle SW), and is provided on the buckle 25. The second switch circuit 23c is electrically connected to the control unit 23a and switches to an ON state or an OFF state depending on the seatbelt wearing state of the seat 2a. The second switch circuit 23c is arranged so as to switch from the OFF state to the ON state when the tongue plate (not shown) of the seat belt and the buckle 25 are fastened.

電源部２４は、検出部２３に電気的に接続され、当該検出部２３に電力を供給する回路である。電源部２４は、制御部２３ａと同様に、ＩＣ回路等で構成される。電源部２４は、図２に示すように、電源回路２４ａと、発電素子２４ｂと、蓄電部２４ｃとを有する。 The power supply unit 24 is a circuit that is electrically connected to the detection unit 23 and supplies electric power to the detection unit 23. Like the control unit 23a, the power supply unit 24 is composed of an IC circuit or the like. As shown in FIG. 2, the power supply unit 24 includes a power supply circuit 24a, a power generation element 24b, and a power storage unit 24c.

電源回路２４ａは、発電素子２４ｂ及び蓄電部２４ｃに電気的に接続されており、発電素子２４ｂで発電された電力を整流して蓄電部２４ｃに蓄電可能な電圧になるように電圧制御を行う回路である。電源回路２４ａは、制御部２３ａに接続され、制御部２３ａから出力された電力を蓄電部２４ｃに蓄電可能な電圧になるように電圧制御を行う。なお、電源回路２４ａは、制御部２３ａから電源供給用の無線信号を入力し、当該無線信号を整流して交流電力から直流電力に変換する構成であってもよい。 The power supply circuit 24a is electrically connected to the power generation element 24b and the power storage unit 24c, and is a circuit that rectifies the power generated by the power generation element 24b and controls the voltage so as to be a voltage that can be stored in the power storage unit 24c. Is. The power supply circuit 24a is connected to the control unit 23a and performs voltage control so that the power output from the control unit 23a becomes a voltage that can be stored in the storage unit 24c. The power supply circuit 24a may be configured to input a power supply radio signal from the control unit 23a, rectify the radio signal, and convert AC power to DC power.

発電素子２４ｂは、検出器２０の環境変化に応じて発電するものであり、例えば圧電素子（ピエゾ素子）や熱電変換素子等が含まれる。本実施形態の発電素子２４ｂは、例えば搭乗者の着座に基づく圧力変化に応じて発電するものが好ましいが、車両２が停止状態から走行状態に移行する際に生じる振動や走行時における路面振動の変化に応じて発電するものであってもよい。また、発電素子２４ｂは、例えば座席２ａが未着座状態から着座状態に移行する際に生ずる温度変化に応じて発電する構成であってもよいし、車室２ｂ内の室温が低温から高温（または高温から低温）に移行する際に生じる温度変化に応じて発電する構成であってもよい。 The power generation element 24b generates power in response to changes in the environment of the detector 20, and includes, for example, a piezoelectric element (piezo element), a thermoelectric conversion element, and the like. The power generation element 24b of the present embodiment preferably generates power according to, for example, a pressure change based on the seating of a occupant, but the vibration generated when the vehicle 2 shifts from the stopped state to the running state and the road surface vibration during running are generated. It may generate electricity according to changes. Further, the power generation element 24b may be configured to generate power in response to a temperature change that occurs when the seat 2a shifts from the unseat state to the seated state, for example, or the room temperature in the passenger compartment 2b may be changed from a low temperature to a high temperature (or). It may be configured to generate electricity in response to a temperature change that occurs during the transition from high temperature to low temperature).

蓄電部２４ｃは、電源回路２４ａに電気的に接続され、電源回路２４ａから出力された直流電力を蓄電するものであり、例えばコンデンサ等から成る。蓄電部２４ｃは、検出器２０が配置される座面部２ａａのスペースを考慮して小型軽量でフィルム状のものが好ましい。 The power storage unit 24c is electrically connected to the power supply circuit 24a and stores the DC power output from the power supply circuit 24a, and is composed of, for example, a capacitor or the like. The power storage unit 24c is preferably small, lightweight, and film-shaped in consideration of the space of the seat surface portion 2aa in which the detector 20 is arranged.

次に、本実施形態における第１スイッチ回路２３ｂの構造について図４～図７を参照して説明する。 Next, the structure of the first switch circuit 23b in the present embodiment will be described with reference to FIGS. 4 to 7.

第１スイッチ回路２３ｂは、図４に示すように、第１可撓性シート４１Ａと、第１可撓性シート４１Ａに対向して配置された第２可撓性シート４１Ｂと、第１可撓性シート４１Ａと第２可撓性シート４１Ｂとの間に介在する絶縁シート４２とを備える。第１スイッチ回路２３ｂは、上下方向（Ｚ方向）において、第１可撓性シート４１Ａ、絶縁シート４２、第２可撓性シート４１Ｂの順に積層された構造を有する。第１可撓性シート及び第２可撓性シートは、電気絶縁性及び可撓性を有するフィルム状の部材であり、例えばポリエステルフィルム等の樹脂材料から成る。 As shown in FIG. 4, the first switch circuit 23b has a first flexible sheet 41A, a second flexible sheet 41B arranged to face the first flexible sheet 41A, and a first flexible sheet. An insulating sheet 42 interposed between the sex sheet 41A and the second flexible sheet 41B is provided. The first switch circuit 23b has a structure in which the first flexible sheet 41A, the insulating sheet 42, and the second flexible sheet 41B are laminated in this order in the vertical direction (Z direction). The first flexible sheet and the second flexible sheet are film-like members having electrical insulation and flexibility, and are made of a resin material such as a polyester film.

第１可撓性シート４１Ａは、第２可撓性シート４１Ｂに対向する第１対向面４１Ａａに形成された一対の第１接点部２２Ａを有する。本実施形態の第１可撓性シート４１Ａは、第２アンテナ部２１と、一対の第１接点部２２Ａとを含む導電パターン４５Ａが表面に形成されている。導電パターン４５Ａは、例えば、銀ペースト等の導電材から成り、スクリーン印刷等により形成される。第２アンテナ部２１と各第１接点部２２Ａは、図６に示すように、第２可撓性シート４１Ｂに対向する第１対向面４１Ａａに形成されている。第２アンテナ部２１は、導電パターンが環状（ループ状）に巻回されて形成される。第２アンテナ部２１は、巻回し開始側の始端部及び巻回し終了側の終端部にそれぞれ第１接点部２２Ａが形成される。第２アンテナ部２１は、アンテナとして最適なアンテナ長に設定されることが好ましく、例えば３２６ｍｍのアンテナ長を有することが好適である。各第１接点部２２Ａは、図５に示すように、奥行方向（Ｘ方向）に弦が伸びる半円形状を有する。一対の第１接点部２２Ａは、幅方向（Ｙ方向）に一定の絶縁間隔を隔てて配置される。一対の第１接点部２２Ａは、図６に示すように、例えば第２接点部２２Ｂとの接触不良等を低減すべく、上下方向（Ｚ方向）の各厚みが同一かつ均一であることが好ましい。一対の第１接点部２２Ａは、第１可撓性シート４１Ａ外の第２スイッチ回路２３ｃに電気的に接続されている。本実施形態の第１スイッチ回路２３ｂと第２スイッチ回路２３ｃとは、直列に接続されている。 The first flexible sheet 41A has a pair of first contact portions 22A formed on the first facing surface 41Aa facing the second flexible sheet 41B. The first flexible sheet 41A of the present embodiment has a conductive pattern 45A formed on the surface thereof, which includes a second antenna portion 21 and a pair of first contact portions 22A. The conductive pattern 45A is made of a conductive material such as silver paste and is formed by screen printing or the like. As shown in FIG. 6, the second antenna portion 21 and each first contact portion 22A are formed on the first facing surface 41Aa facing the second flexible sheet 41B. The second antenna portion 21 is formed by winding a conductive pattern in an annular shape (loop shape). In the second antenna portion 21, the first contact portion 22A is formed at the start end portion on the winding start side and the end portion on the winding end side, respectively. The second antenna portion 21 is preferably set to an optimum antenna length as an antenna, and preferably has an antenna length of, for example, 326 mm. As shown in FIG. 5, each first contact portion 22A has a semicircular shape in which the strings extend in the depth direction (X direction). The pair of first contact portions 22A are arranged at a constant insulation interval in the width direction (Y direction). As shown in FIG. 6, it is preferable that the pair of first contact portions 22A have the same and uniform thickness in the vertical direction (Z direction) in order to reduce contact failure with the second contact portion 22B, for example. .. The pair of first contact portions 22A are electrically connected to the second switch circuit 23c outside the first flexible sheet 41A. The first switch circuit 23b and the second switch circuit 23c of the present embodiment are connected in series.

第２可撓性シート４１Ｂは、第２接点部２２Ｂを有する。第２接点部２２Ｂは、第１可撓性シート４１Ａに対向する第２対向面４１Ｂａに形成されている。第２接点部２２Ｂは、導電パターンとして第２可撓性シート４１Ｂの表面に形成されている。 The second flexible sheet 41B has a second contact portion 22B. The second contact portion 22B is formed on the second facing surface 41Ba facing the first flexible sheet 41A. The second contact portion 22B is formed on the surface of the second flexible sheet 41B as a conductive pattern.

絶縁シート４２は、電気絶縁性及び可撓性を有するフィルム状の部材であり、例えばポリエステルフィルム等の樹脂材料から成る。絶縁シート４２は、第１接点部２２Ａと第２接点部２２Ｂとが対向する位置において、第１対向面４１Ａａから第２対向面４１Ｂａまで貫通する貫通孔４２ａを有する。貫通孔４２ａは、第１可撓性シート４１Ａと絶縁シート４２とが積層された状態で第１接点部２２Ａが露出する位置に形成され、かつ第２可撓性シート４１Ｂと絶縁シート４２とが積層された状態で第２接点部２２Ｂが露出する位置に形成される。貫通孔４２ａは、図５に示すように、上下方向に重ね合わせた状態にある一対の第１接点部２２Ａと第２接点部２２Ｂを収容可能な孔径を有する。絶縁シート４２は、上下方向の厚みが、例えば搭乗者の着座に基づく外力Ｆに応じて第１接点部２２Ａと第２接点部２２Ｂとが接触するように設定されることが好ましい。 The insulating sheet 42 is a film-like member having electrical insulation and flexibility, and is made of a resin material such as a polyester film. The insulating sheet 42 has a through hole 42a penetrating from the first facing surface 41Aa to the second facing surface 41Ba at a position where the first contact portion 22A and the second contact portion 22B face each other. The through hole 42a is formed at a position where the first contact portion 22A is exposed in a state where the first flexible sheet 41A and the insulating sheet 42 are laminated, and the second flexible sheet 41B and the insulating sheet 42 are formed. It is formed at a position where the second contact portion 22B is exposed in a laminated state. As shown in FIG. 5, the through hole 42a has a hole diameter capable of accommodating a pair of first contact portions 22A and second contact portions 22B in a state of being overlapped in the vertical direction. It is preferable that the thickness of the insulating sheet 42 in the vertical direction is set so that the first contact portion 22A and the second contact portion 22B come into contact with each other in accordance with, for example, an external force F based on the seating of the occupant.

上述したように、第１スイッチ回路２３ｂは、座席２ａへの着座状態に応じて、第１接点部２２Ａと第２接点部２２Ｂとが接触する接触状態、又は、第１接点部２２Ａと第２接点部２２Ｂとが接触しない非接触状態に切り替わる。第１スイッチ回路２３ｂは、例えば、図７に示すように搭乗者の着座に基づく外力Ｆが加えられている場合、第１接点部２２Ａと第２接点部２２Ｂとが接触状態、すなわち電気的に導通状態（ＯＮ状態）となる。このとき、第１接点部２２Ａと第２接点部２２Ｂ間の抵抗（または第１接点部２２Ａと第２接点部２２Ｂ間を流れる電流）の変化を制御部２３ａで検出することにより、第１スイッチ回路２３ｂのＯＮ状態が検出される。一方、第１スイッチ回路２３ｂは、搭乗者の着座に基づく外力Ｆが加えられていない場合、第１接点部２２Ａと第２接点部２２Ｂとが非接触状態、すなわち電気的に非導通状態（ＯＦＦ状態）となる。このように、第１スイッチ回路２３ｂは、搭乗者が座席２ａに着座した場合、当該搭乗者の座面部２ａａに対する押圧力によりＯＮ状態に切り替わり、搭乗者が座席２ａに着座していない場合には、搭乗者の押圧力から解放されることによりＯＦＦ状態に切り替わる。 As described above, in the first switch circuit 23b, depending on the seated state on the seat 2a, the first contact portion 22A and the second contact portion 22B are in contact with each other, or the first contact portion 22A and the second contact portion 22A are in contact with each other. It switches to a non-contact state in which the contact portion 22B does not come into contact with the contact portion 22B. In the first switch circuit 23b, for example, when an external force F based on the seating of the occupant is applied as shown in FIG. 7, the first contact portion 22A and the second contact portion 22B are in contact with each other, that is, electrically. It becomes a conduction state (ON state). At this time, the first switch is switched by detecting the change in the resistance between the first contact portion 22A and the second contact portion 22B (or the current flowing between the first contact portion 22A and the second contact portion 22B) by the control unit 23a. The ON state of the circuit 23b is detected. On the other hand, in the first switch circuit 23b, when an external force F based on the seating of the occupant is not applied, the first contact portion 22A and the second contact portion 22B are in a non-contact state, that is, in an electrically non-conducting state (OFF). State). As described above, when the passenger is seated in the seat 2a, the first switch circuit 23b is switched to the ON state by the pressing force on the seat surface portion 2aa of the passenger, and when the passenger is not seated in the seat 2a, the first switch circuit 23b is switched to the ON state. , It switches to the OFF state by being released from the pressing pressure of the passenger.

次に、車両用検出システム１の動作例について図８を参照して説明する。 Next, an operation example of the vehicle detection system 1 will be described with reference to FIG.

車両用検出システム１のコントローラ１３は、まず、ＡＣＣ電源又はＩＧ電源がＯＮであるか否かを判定する（ステップＳ１）。次に、コントローラ１３は、ＡＣＣ電源又はＩＧ電源がＯＮである場合（ステップＳ１でＹｅｓ）、送受信部１２により各検出器２０を検出する（ステップＳ２）。例えば、コントローラ１３は、第１アンテナ部１１を介して送受信部１２から各検出器２０に電力供給用の無線信号を含む送信信号を所定間隔（例えば１秒間隔）で送信する。 The controller 13 of the vehicle detection system 1 first determines whether or not the ACC power supply or the IG power supply is ON (step S1). Next, when the ACC power supply or the IG power supply is ON (Yes in step S1), the controller 13 detects each detector 20 by the transmission / reception unit 12 (step S2). For example, the controller 13 transmits a transmission signal including a radio signal for power supply from the transmission / reception unit 12 to each detector 20 via the first antenna unit 11 at predetermined intervals (for example, 1 second intervals).

次に、コントローラ１３は、各検出器２０から返答があるか否かを判定する（ステップＳ３）。例えば、各検出器２０は、第１スイッチ回路２３ｂがＯＮ状態である場合、制御部２３ａから第２アンテナ部２１を介して第１検出信号をリーダ１０に送信する。一方、各検出器２０は、第１スイッチ回路２３ｂがＯＦＦ状態である場合、制御部２３ａから第２アンテナ部２１を介して第１検出信号をリーダ１０に送信しない。また、各検出器２０は、第２スイッチ回路２３ｃがＯＮ状態である場合、制御部２３ａから第２アンテナ部２１を介して第２検出信号をリーダ１０に送信する。一方、各検出器２０は、第２スイッチ回路２３ｃがＯＦＦ状態である場合、制御部２３ａから第２アンテナ部２１を介して第２検出信号をリーダ１０に送信しない。リーダ１０は、各検出器２０から第１検出信号及び第２検出信号の少なくとも一方を受信すると、受信した検出信号の識別情報をコントローラ１３に出力する。コントローラ１３は、リーダ１０から識別情報が出力されると各検出器２０から返答があったと判定する。コントローラ１３は、各検出器２０から返答があったと判定した場合（ステップＳ３；Ｙｅｓ）、識別情報に基づいて座席２ａの着座状態、及び、シートベルトの装着状態を判定する（ステップＳ４）。例えば、コントローラ１３は、１つの座席２ａに配置された検出器２０から第１検出信号として識別情報を受信した場合、当該座席２ａに搭乗者が着座したものと判定する。さらに、コントローラ１３は、当該座席２ａに配置された検出器２０から第２検出信号として識別情報を受信した場合、当該座席２ａのシートベルトが装着されたものと判定する。 Next, the controller 13 determines whether or not there is a response from each detector 20 (step S3). For example, each detector 20 transmits a first detection signal from the control unit 23a to the reader 10 via the second antenna unit 21 when the first switch circuit 23b is in the ON state. On the other hand, when the first switch circuit 23b is in the OFF state, each detector 20 does not transmit the first detection signal from the control unit 23a to the reader 10 via the second antenna unit 21. Further, each detector 20 transmits a second detection signal from the control unit 23a to the reader 10 via the second antenna unit 21 when the second switch circuit 23c is in the ON state. On the other hand, when the second switch circuit 23c is in the OFF state, each detector 20 does not transmit the second detection signal from the control unit 23a to the reader 10 via the second antenna unit 21. When the reader 10 receives at least one of the first detection signal and the second detection signal from each detector 20, the reader 10 outputs the identification information of the received detection signal to the controller 13. When the identification information is output from the reader 10, the controller 13 determines that each detector 20 has responded. When the controller 13 determines that there is a response from each detector 20 (step S3; Yes), the controller 13 determines the seated state of the seat 2a and the seatbelt wearing state based on the identification information (step S4). For example, when the controller 13 receives the identification information as the first detection signal from the detector 20 arranged in one seat 2a, it determines that the passenger is seated in the seat 2a. Further, when the controller 13 receives the identification information as the second detection signal from the detector 20 arranged in the seat 2a, it determines that the seat belt of the seat 2a is fastened.

次に、コントローラ１３は、搭乗者が着座した座席２ａのシートベルトの装着状態に応じて当該搭乗者への報知が必要か否かを判定する（ステップＳ５）。例えば、コントローラ１３は、搭乗者が着座した座席２ａのシートベルトが非装着であった場合には報知が必要と判定し（ステップＳ５；Ｙｅｓ）、報知部１４に警告信号を出力する。報知部１４は、出力された警告信号に応じて警告ランプを点灯し、シートベルトが非装着の搭乗者に対して警告を行う（ステップＳ６）。一方、コントローラ１３は、搭乗者が着座した座席２ａのシートベルトが装着状態になった場合には報知が不要と判定し（ステップＳ５；Ｎｏ）、報知部１４に消灯信号を出力する。報知部１４は、出力された消灯信号に応じて警告ランプを消灯する（ステップＳ７）。本実施形態では、図９に示すように、第１スイッチ回路２３ｂがＯＮ状態において、第２スイッチ回路２３ｃがＯＮ状態のときに警告ランプが消灯し、ＯＦＦ状態のときに点灯する。一方、第１スイッチ回路２３ｂがＯＦＦ状態のときは、第２スイッチ回路２３ｃがＯＮ状態、ＯＦＦ状態のいずれかであっても、警告ランプが消灯する。次に、コントローラ１３は、ＡＣＣ電源又はＩＧ電源がＯＦＦであるか否かを判定する（ステップＳ８）。コントローラ１３は、ＡＣＣ電源又はＩＧ電源がＯＦＦである場合（ステップＳ８；Ｙｅｓ）、本処理を終了する。一方、コントローラ１３は、ＡＣＣ電源又はＩＧ電源がＯＮである場合（ステップＳ５；Ｎｏ）、上述のステップＳ２以降の処理を行う。 Next, the controller 13 determines whether or not notification to the occupant is necessary according to the wearing state of the seat belt of the seat 2a in which the occupant is seated (step S5). For example, the controller 13 determines that notification is necessary when the seat belt of the seat 2a in which the passenger is seated is not fastened (step S5; Yes), and outputs a warning signal to the notification unit 14. The notification unit 14 turns on the warning lamp in response to the output warning signal, and warns the passenger who is not wearing the seatbelt (step S6). On the other hand, when the seat belt of the seat 2a in which the passenger is seated is in the wearing state, the controller 13 determines that notification is unnecessary (step S5; No), and outputs a turn-off signal to the notification unit 14. The notification unit 14 turns off the warning lamp in response to the output turn-off signal (step S7). In the present embodiment, as shown in FIG. 9, the warning lamp is turned off when the first switch circuit 23b is in the ON state and the second switch circuit 23c is in the ON state, and is turned on when the second switch circuit 23c is in the OFF state. On the other hand, when the first switch circuit 23b is in the OFF state, the warning lamp is turned off regardless of whether the second switch circuit 23c is in the ON state or the OFF state. Next, the controller 13 determines whether or not the ACC power supply or the IG power supply is OFF (step S8). When the ACC power supply or the IG power supply is OFF (step S8; Yes), the controller 13 ends this process. On the other hand, when the ACC power supply or the IG power supply is ON (step S5; No), the controller 13 performs the processes after step S2 described above.

上述のステップＳ１において、コントローラ１３は、ＡＣＣ電源又はＩＧ電源がＯＦＦである場合（ステップＳ１；Ｎｏ）、本処理を終了する。また、上述のステップＳ３において、コントローラ１３は、各検出器２０から返答がなかった場合（ステップＳ３；Ｎｏ）、上述のステップＳ１以降の処理を行う。 In step S1 described above, the controller 13 ends this process when the ACC power supply or the IG power supply is OFF (step S1; No). Further, in the above-mentioned step S3, when there is no response from each detector 20 (step S3; No), the controller 13 performs the processing after the above-mentioned step S1.

以上説明したように、本実施形態の検出器２０は、第２アンテナ部２１と、制御部２３ａと、第１スイッチ回路２３ｂと、第２スイッチ回路２３ｃと、制御部２３ａを駆動する電力を供給する電源部２４とを備える。電源部２４は、発電素子２４ｂと、発電素子２４ｂにより発電された電力を蓄電する蓄電部２４ｃとを有する。制御部２３ａは、第１スイッチ回路２３ｂのＯＮ状態に応じて第１検出信号を第２アンテナ部２１に出力し、第２スイッチ回路２３ｃのＯＮ状態に応じて第２検出信号を第２アンテナ部２１に出力する。このように、検出器２０は、通信環境の変化等により十分な無線給電が行えない場合でも、発電素子２４ｂにより発電される電力により駆動することが可能となる。その結果、第１スイッチ回路２３ｂや第２スイッチ回路２３ｃ等の接点の接触抵抗の増加により消費電力が増えても、十分な検出精度を得ることができる。また、検出器２０は、無線による給電、発電素子２４ｂによる給電の、少なくとも一方が可能となるので、バッテリや電源供給用の配線が不要となり、製造コストの増加や重量の増加を抑制することができる。 As described above, the detector 20 of the present embodiment supplies electric power for driving the second antenna unit 21, the control unit 23a, the first switch circuit 23b, the second switch circuit 23c, and the control unit 23a. The power supply unit 24 is provided. The power supply unit 24 includes a power generation element 24b and a power storage unit 24c for storing the electric power generated by the power generation element 24b. The control unit 23a outputs the first detection signal to the second antenna unit 21 according to the ON state of the first switch circuit 23b, and outputs the second detection signal to the second antenna unit 21 according to the ON state of the second switch circuit 23c. Output to 21. As described above, the detector 20 can be driven by the electric power generated by the power generation element 24b even when sufficient wireless power supply cannot be performed due to a change in the communication environment or the like. As a result, sufficient detection accuracy can be obtained even if the power consumption increases due to the increase in the contact resistance of the contacts of the first switch circuit 23b, the second switch circuit 23c, and the like. Further, since the detector 20 can perform at least one of wireless power supply and power generation by the power generation element 24b, wiring for battery and power supply is not required, and it is possible to suppress an increase in manufacturing cost and an increase in weight. can.

また、本実施形態の検出器２０は、第１スイッチ回路２３ｂが、第１可撓性シート４１Ａと、第１可撓性シート４１Ａに対向して配置された第２可撓性シート４１Ｂと、第１可撓性シート４１Ａと第２可撓性シート４１Ｂとの間に介在する絶縁シート４２とを有する。第１可撓性シート４１Ａは、制御部２３ａに電気的に接続され、かつ第２可撓性シート４１Ｂに対向する第１対向面４１Ａａに形成された第１接点部２２Ａを有する。第２可撓性シート４１Ｂは、第１可撓性シート４１Ａに対向する第２対向面４１Ｂａに形成された第２接点部２２Ｂを有する。絶縁シート４２は、第１接点部２２Ａと第２接点部２２Ｂとが対向する位置において、第１対向面４１Ａａから第２対向面４１Ｂａまで貫通する貫通孔４２ａを有する。第１接点部２２Ａ及び第２接点部２２Ｂは、搭乗者の着座に基づく外力Ｆにより相互に接触してＯＮ状態となる。このように、検出器２０は、可撓性シートで構成されていることから、座席２ａの形状に合わせることができ、当該検出器２０の設置性を向上させると共に、搭乗者の着座を精度よく検出することができる。 Further, in the detector 20 of the present embodiment, the first switch circuit 23b has a first flexible sheet 41A and a second flexible sheet 41B arranged so as to face the first flexible sheet 41A. It has an insulating sheet 42 interposed between the first flexible sheet 41A and the second flexible sheet 41B. The first flexible sheet 41A has a first contact portion 22A that is electrically connected to the control unit 23a and is formed on a first facing surface 41Aa that faces the second flexible sheet 41B. The second flexible sheet 41B has a second contact portion 22B formed on a second facing surface 41Ba facing the first flexible sheet 41A. The insulating sheet 42 has a through hole 42a penetrating from the first facing surface 41Aa to the second facing surface 41Ba at a position where the first contact portion 22A and the second contact portion 22B face each other. The first contact portion 22A and the second contact portion 22B come into contact with each other by an external force F based on the seating of the occupant and are turned on. As described above, since the detector 20 is made of a flexible seat, it can be matched to the shape of the seat 2a, improving the installability of the detector 20 and accurately seating the occupant. Can be detected.

また、本実施形態の車両用検出システム１は、検出器２０と、リーダ１０とを備える。リーダ１０は、第１検出信号に基づいて座席２ａへの搭乗者の着座状態を判定し、かつ第２検出信号に基づいてシートベルトの装着状態を判定して、搭乗者が着座状態であり、かつシートベルトが未装着状態である場合には、当該搭乗者に警告を行う。これにより、座席２ａに着座した搭乗者がシートベルト未装着状態である場合、当該搭乗者にシートベルトの着用を促すことができる。 Further, the vehicle detection system 1 of the present embodiment includes a detector 20 and a reader 10. The reader 10 determines the seated state of the occupant on the seat 2a based on the first detection signal, and determines the seatbelt wearing state based on the second detection signal, so that the occupant is in the seated state. If the seatbelt is not fastened, a warning is given to the passenger. As a result, when the passenger seated in the seat 2a is not wearing the seatbelt, the passenger can be urged to wear the seatbelt.

なお、上記実施形態では、リーダ１０と各検出器２０とは、ＲＦＩＤによる無線通信を行うが、近距離無線通信を行う技術であれば、これに限定されず、ＮＦＣ（ＮｅａｒＦｉｅｌｄＣｏｍｍｕｎｉｃａｔｉｏｎ）、ＴｒａｎｓｆｅｒＪｅｔ（登録商標）、ＺｉｇＢｅｅ（登録商標）等を用いてもよい。 In the above embodiment, the reader 10 and each detector 20 perform wireless communication by RFID, but the technique is not limited to this as long as it is a technique for performing short-range wireless communication, and NFC (Near Field Communication), TransferJet, etc. (Registered trademark), ZigBee (registered trademark) and the like may be used.

また、上記実施形態では、コントローラ１３とＥＣＵとが別体に構成されているが、一体に構成されていてもよい。すなわち、コントローラ１３が実行する動作をＥＣＵが実行するように構成されてもよい。 Further, in the above embodiment, the controller 13 and the ECU are configured separately, but may be configured integrally. That is, the ECU may be configured to execute the operation executed by the controller 13.

また、上記実施形態では、第２スイッチ回路２３ｃは、第１スイッチ回路２３ｂと異なる構成を有するが、第１スイッチ回路２３ｂと同様の構成であってよい。すなわち、第２スイッチ回路２３ｃは、以下の構成を有する。第２スイッチ回路２３ｃは、第１可撓性シート４１Ａと、第１可撓性シート４１Ａに対向して配置された第２可撓性シート４１Ｂと、第１可撓性シート４１Ａと第２可撓性シート４１Ｂとの間に介在する絶縁シート４２とを備える。第１可撓性シート４１Ａは、制御部２３ａに電気的に接続され、第２可撓性シート４１Ｂに対向する第１対向面４１Ａａに形成された第１接点部２２Ａを有する。第２可撓性シート４１Ｂは、第１可撓性シート４１Ａに対向する第２対向面４１Ｂａに形成された第２接点部２２Ｂを有する。絶縁シート４２は、第１接点部２２Ａと第２接点部２２Ｂとが対向する位置において、第１対向面４１Ａａから第２対向面４１Ｂａまで貫通する貫通孔４２ａを有する。第１接点部２２Ａ及び第２接点部２２Ｂは、シートベルトのタングプレートとバックル２５との締結時に、当該タングプレートに基づく外力Ｆにより相互に接触してＯＮ状態となる。 Further, in the above embodiment, the second switch circuit 23c has a different configuration from the first switch circuit 23b, but may have the same configuration as the first switch circuit 23b. That is, the second switch circuit 23c has the following configuration. The second switch circuit 23c includes a first flexible sheet 41A, a second flexible sheet 41B arranged to face the first flexible sheet 41A, a first flexible sheet 41A, and a second flexible sheet. An insulating sheet 42 interposed between the flexible sheet 41B and the flexible sheet 41B is provided. The first flexible sheet 41A has a first contact portion 22A that is electrically connected to the control unit 23a and is formed on a first facing surface 41Aa that faces the second flexible sheet 41B. The second flexible sheet 41B has a second contact portion 22B formed on a second facing surface 41Ba facing the first flexible sheet 41A. The insulating sheet 42 has a through hole 42a penetrating from the first facing surface 41Aa to the second facing surface 41Ba at a position where the first contact portion 22A and the second contact portion 22B face each other. When the tongue plate of the seat belt and the buckle 25 are fastened, the first contact portion 22A and the second contact portion 22B come into contact with each other by an external force F based on the tongue plate and are turned on.

１車両用検出システム
２ａ座席
１０リーダ
１３コントローラ
２０検出器
２１第２アンテナ部
２２Ａ第１接点部
２２Ｂ第２接点部
２３検出部
２３ａ制御部
２３ｂ第１スイッチ回路
２３ｃ第２スイッチ回路
２４電源部
２４ａ電源回路
２４ｂ発電素子
２４ｃ蓄電部
２５バックル
４１Ａ第１可撓性シート
４１Ｂ第２可撓性シート
４２絶縁シート 1 Vehicle detection system 2a Seat 10 Reader 13 Controller 20 Detector 21 2nd antenna part 22A 1st contact part 22B 2nd contact part 23 Detection part 23a Control part 23b 1st switch circuit 23c 2nd switch circuit 24 Power supply part 24a Power supply Circuit 24b Power generation element 24c Power storage unit 25 Buckle 41A 1st flexible sheet 41B 2nd flexible sheet 42 Insulation sheet

Claims

It is a vehicle detector that detects the state inside the vehicle.
An antenna unit that transmits and receives wireless signals to and from a reader provided in the vehicle and receives at least a transmission signal including a wireless signal for power supply.
A control unit that drives at least a radio signal for power supply included in the transmission signal received by the antenna unit as a power source.
A first switch circuit that is electrically connected to the control unit and switches to an ON state or an OFF state depending on the seated state of the occupant in the seat in the vehicle.
A second switch circuit that is electrically connected to the control unit and switches to an ON state or an OFF state depending on the seatbelt wearing state of the seat.
A power supply unit for supplying electric power for driving the control unit is provided.
The power supply unit
Power generation element and
It has a power storage unit that stores the power generated by the power generation element.
The control unit
The first detection signal is output to the antenna unit according to the ON state of the first switch circuit, and the second detection signal is output to the antenna unit according to the ON state of the second switch circuit.
The first switch circuit is
The first flexible sheet and
A second flexible sheet arranged to face the first flexible sheet and
It has electrical insulation and has an insulating sheet interposed between the first flexible sheet and the second flexible sheet.
The first flexible sheet is
It has a pair of first contact portions electrically connected to the control unit and formed on a first facing surface facing the second flexible sheet.
The second flexible sheet is
It has a second contact portion formed on a second facing surface facing the first flexible sheet, and has a second contact portion.
The insulating sheet is
It has a through hole penetrating from the first facing surface to the second facing surface at a position where the pair of the first contact portions and the second contact portion face each other.
The pair of the first contact portion and the second contact portion
Due to an external force based on the seating of the occupant, the second contact portion is overlapped with each of the first contact portions and in contact with each other to be in the ON state.
The antenna portion is
It is formed in an annular shape on the first facing surface, the start end portion on the winding start side is formed on one of the pair of the first contact portions, and the end portion on the winding end side is the pair of the first contact portions. Formed on the other
A detector for vehicles characterized by that.

The vehicle detector according to claim 1 and
With a reader provided in the vehicle, which transmits and receives radio signals to and from the vehicle detector, transmits a transmission signal including at least a radio signal for power supply, and receives a first detection signal and a second detection signal. Equipped with
The reader
The seated state of the passenger in the seat is determined based on the first detection signal, and the seatbelt wearing state is determined based on the second detection signal, and the passenger is in the seated state. In addition, a determination unit that outputs a warning signal when the seat belt is not fastened, and
It has a notification unit that warns the passenger in response to the warning signal.
A vehicle detection system characterized by this.

The vehicle detector is
When the first switch circuit is in the ON state, the first detection signal is transmitted from the control unit to the reader via the antenna unit, while when the first switch circuit is in the OFF state, the control unit is in the OFF state. Does not transmit the first detection signal to the reader,
When the second switch circuit is in the ON state, the second detection signal is transmitted from the control unit to the reader via the antenna unit, while when the second switch circuit is in the OFF state, the control unit is in the OFF state. Does not transmit the second detection signal to the reader,
The determination unit
When the first detection signal is received from the vehicle detector and the second detection signal is not received, it is determined that the passenger is in the seated state and the seat belt is not fastened. Output the warning signal,
The vehicle detection system according to claim 2.