JP5331449B2 - Vehicle communication device and method for receiving the same - Google Patents

Vehicle communication device and method for receiving the same Download PDF

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JP5331449B2
JP5331449B2 JP2008285814A JP2008285814A JP5331449B2 JP 5331449 B2 JP5331449 B2 JP 5331449B2 JP 2008285814 A JP2008285814 A JP 2008285814A JP 2008285814 A JP2008285814 A JP 2008285814A JP 5331449 B2 JP5331449 B2 JP 5331449B2
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JP2010114684A (en
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健人 菅原
直人 相澤
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Alps Alpine Co Ltd
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Alps Electric Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

<P>PROBLEM TO BE SOLVED: To receive data for one frame portion without repeating a receiving failure and to suppress power consumption during standby even when the noise setting number is made a small value when a signal can be received as a normal signal. <P>SOLUTION: Communication equipment 1 for a vehicle is activated in an intermittent receiving timing to start the receiving operation of a transmission signal, counts noise included in a reception signal from a reception start, resets a noise count value upon receiving a start signal showing a frame start, and stops the receiving operation when the noise count value reaches a predetermined set value before resetting. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

本発明は、起動時にカウントされるノイズ数が所定値を越えるとデータ受信を停止する機能を備えた車両用通信装置及びその受信方法に関する。   The present invention relates to a vehicle communication device having a function of stopping data reception when the number of noises counted at startup exceeds a predetermined value, and a reception method thereof.

従来、車両のドア等のロック／アンロック等はイグニッションキーと共通の機械式のキーをドアのキーシリンダに挿入して行うものが一般的であったが、最近は機械式のキーをドアのキーシリンダに挿入することなく遠隔操作できるようにしたキーレスエントリシステムが普及している。また、キーレスエントリシステムに限らず、車両から離れた場所で携帯機のボタンを押すと、携帯機と車両側装置との間で通信を行い、車両側の情報を車両側装置から携帯機に送信して携帯機に表示できるようにした車両用通信システムが提案されている（例えば、特許文献１参照）。   Conventionally, locking / unlocking of vehicle doors and the like has been generally performed by inserting a mechanical key common to the ignition key into the key cylinder of the door. Recently, however, the mechanical key is attached to the door key. A keyless entry system that can be operated remotely without being inserted into a key cylinder has become widespread. In addition to keyless entry systems, when a button on a portable device is pressed away from the vehicle, communication is performed between the portable device and the vehicle-side device, and vehicle-side information is transmitted from the vehicle-side device to the portable device. A vehicle communication system that can be displayed on a portable device has been proposed (see, for example, Patent Document 1).

車両用通信システムでは、携帯機のロック釦を１回操作することで同一の送信信号（１フレーム）を複数回連続して送信している。１フレームは、起動信号（１０パルス程度の矩形波）とデータ信号（携帯機のＩＤ番号、ロック／アンロック等の命令信号）とから構成しているものがある。車両側装置は、間欠受信動作しており、どのタイミングで受信した場合でも起動信号を受信できるように、間欠受信周期及び１回の受信動作時間が設定されている。そして、起動信号を受信すると継続動作状態となり、起動信号に続いて送信されるデータ信号を受信可能な状態となる。たとえば、起動信号を受信したら１フレームに相当する時間は起動状態となるようにタイマーで設定する。   In the vehicle communication system, the same transmission signal (one frame) is continuously transmitted a plurality of times by operating the lock button of the portable device once. One frame includes an activation signal (rectangular wave of about 10 pulses) and a data signal (instruction signal such as a portable device ID number and lock / unlock). The vehicle-side device is performing an intermittent reception operation, and an intermittent reception cycle and a single reception operation time are set so that an activation signal can be received at any timing. When the activation signal is received, the continuous operation state is entered, and the data signal transmitted following the activation signal can be received. For example, when a start signal is received, a timer is set so that a time corresponding to one frame is in a start state.

ところで、携帯機と車両側装置との間で無線通信を行う場合、所定量以上のノイズが混在すると、送信機からの送信信号を受信機において正しく受信できない可能性が高くなる。そこで、従来はデータ受信開始時からノイズ数をカウントして１回の受信動作時間でノイズカウント数が所定値を超えたら、その時点でデータ受信を停止して次回の間欠受信タイミングまでスリープ状態にしていた。   By the way, when performing wireless communication between the portable device and the vehicle-side device, if a predetermined amount or more of noise is mixed, there is a high possibility that a transmission signal from the transmitter cannot be correctly received by the receiver. Therefore, conventionally, when the number of noises is counted from the start of data reception and the noise count number exceeds a predetermined value in one reception operation time, data reception is stopped at that point and the sleep state is set until the next intermittent reception timing. It was.

図４を参照して従来のノイズ判定動作について説明する。
図４（ａ）は送信信号の最初の２フレームを示しており、同図（ｂ）はＦＳＫ変調した送信データの具体例を示している。今、図４（ｂ）に示すようにＦＳＫ変調した送信信号に対して、同図（ｃ）に斜線で示すノイズが混在したものとする。最初のフレームには４つのノイズが混在し、次のフレームには４つのノイズが混在している。また、フレーム間には１つのノイズが存在している。 A conventional noise determination operation will be described with reference to FIG.
FIG. 4A shows the first two frames of the transmission signal, and FIG. 4B shows a specific example of FSK modulated transmission data. Now, as shown in FIG. 4 (b), it is assumed that the FSK-modulated transmission signal is mixed with noise indicated by hatching in FIG. 4 (c). Four noises are mixed in the first frame, and four noises are mixed in the next frame. There is one noise between frames.

受信側となる車両側装置において、１フレームでのノイズ混在数が６個を越えたら、即座に受信動作を停止して次の間欠受信動作までスリープ状態となるように設定されているとする。   It is assumed that the vehicle-side device on the reception side is set to immediately stop the reception operation and enter the sleep state until the next intermittent reception operation when the number of noises mixed in one frame exceeds six.

図４（ｄ）に示すように、車両側装置は間欠受信タイミングが到来すると、スリープ状態から起動して受信信号があるか否か判断する。時刻ｔ１のタイミングで起動した場合、最初のフレームの送信信号が受信されるので、そのまま受信動作を継続して起動信号が検出されるのを待つ。このとき、パルス幅などからノイズ検出を同時に行い、検出されるノイズ数をカウントしていく。図４（ｄ）（ｅ）に示すように、フレーム途中から受信動作を開始した場合は、当該フレームに混在するノイズをカウントすると共に、次のフレームの起動信号が検出された後も、１フレーム分のデータ信号を完全に受信するまで、引き続きノイズカウントを継続する。図４（ｅ）に示す例では、２番目のフレームのデータ信号を受信している途中でノイズカウント数が設定値＝６に達したために、受信動作を中止している。図４（ｄ）に示す時刻ｔ２のタイミングで起動した場合は、起動信号を検出してからデータ信号を全て受信するまでのノイズカウント数が５個であるので、そのまま受信動作を継続している。
特開平４−３１５６８３号公報 特開２００４−１０７９０６号公報 As shown in FIG. 4D, when the intermittent reception timing arrives, the vehicle side device is activated from the sleep state and determines whether there is a reception signal. When starting at the timing of time t1, since the transmission signal of the first frame is received, the reception operation is continued as it is until the start signal is detected. At this time, noise detection is performed simultaneously from the pulse width and the number of detected noises is counted. As shown in FIGS. 4D and 4E, when the reception operation is started in the middle of the frame, the noise mixed in the frame is counted and one frame is detected after the activation signal of the next frame is detected. The noise count continues until the minute data signal is completely received. In the example shown in FIG. 4E, the reception operation is stopped because the noise count reaches the set value = 6 while the data signal of the second frame is being received. When starting at time t2 shown in FIG. 4D, since the number of noise counts from the detection of the start signal to the reception of all data signals is 5, the reception operation is continued as it is. .
JP-A-4-315683 JP 2004-107906 A

しかしながら、図４（ｃ）に示すように、フレーム毎にみればノイズ数が設定値（６個）未満であるにも拘わらず、１フレーム分のデータを受信する前に受信動作を停止しているので、正規の信号として受信可能な状態であっても受信失敗を繰り返す可能性があった。この問題はノイズ数の設定値を小さくする程、顕著になる傾向がある一方、ノイズ数の設定値を大きくすれば、ノイズ数が設定値になるまで起動状態を維持するので、起動時間が長くなり、待機時消費電力が増大する問題がある。   However, as shown in FIG. 4 (c), the reception operation is stopped before receiving one frame of data even though the number of noises is less than the set value (six) when viewed for each frame. Therefore, there is a possibility that the reception failure may be repeated even when the signal can be received as a regular signal. This problem tends to become more prominent as the noise number setting value is reduced.On the other hand, if the noise number setting value is increased, the startup state is maintained until the noise number reaches the setting value. Therefore, there is a problem that power consumption during standby increases.

本発明は、かかる点に鑑みてなされたものであり、正規の信号として受信可能な状態であればノイズ設定数を小さい値にしても、受信失敗を繰り返すことなく１フレーム分のデータを受信でき、待機時消費電力を抑制可能な車両用通信装置を提供することを目的とする。   The present invention has been made in view of such a point, and can receive data for one frame without repeating reception failure even if the number of noise settings is small, as long as the signal can be received as a regular signal. An object of the present invention is to provide a vehicle communication device capable of suppressing standby power consumption.

本発明の車両用通信装置は、連続して送信された複数フレームの送信信号を間欠受信する車両用通信装置であって、間欠受信タイミングになると起動して前記送信信号の受信動作を開始し、前記送信信号を検波することでノイズを検出し、受信開始時から受信信号に含まれた前記ノイズをカウントし、フレームの始まりを示す信号を受信するとノイズカウント値をリセットし、リセット前にノイズカウント値が予め定めた設定値に到達した場合は当該受信動作を中止することを特徴とする。 The vehicle communication device of the present invention is a vehicle communication device that intermittently receives transmission signals of a plurality of frames that are continuously transmitted, starts when the intermittent reception timing is reached, and starts the reception operation of the transmission signal, the noise is detected by detecting a transmission signal, and counts the noise included in the received signal from the time of receiving the start, resetting the noise count value when receiving a signal indicating the start of a frame, the noise count before resetting The reception operation is stopped when the value reaches a predetermined set value.

この構成によれば、受信開始時から受信信号に含まれたノイズをカウントし、フレームの始まりを示す信号を受信するとノイズカウント値をリセットするので、従来技術のように受信開始時からフレームが切り替わっても継続的にノイズカウント数を累積する場合に比べて、受信精度は維持したままで受信中止までのノイズカウント数を低減でき、車両用通信装置の起動時間を短くすることができる。   According to this configuration, the noise included in the received signal is counted from the start of reception, and when the signal indicating the start of the frame is received, the noise count value is reset, so that the frame is switched from the start of reception as in the prior art. However, as compared with the case where the noise count number is continuously accumulated, the noise count number until the reception is stopped can be reduced while maintaining the reception accuracy, and the startup time of the vehicle communication device can be shortened.

上記車両用通信装置において、前記フレームは、フレーム先頭にフレームの始まりを示す起動信号が配置され、起動信号の後にデータ信号が配置された構成とすることができる。フレーム先頭に配置される起動信号を検出することで、ノイズリセットのタイミングを得ることができる。   In the vehicle communication device, the frame may be configured such that an activation signal indicating the start of the frame is arranged at the top of the frame, and a data signal is arranged after the activation signal. The noise reset timing can be obtained by detecting the activation signal arranged at the head of the frame.

また本発明は、送信側装置から連続して送信された複数フレームの送信信号を受信側装置で間欠受信する車両用通信装置の受信方法であって、間欠受信タイミングになると前記送信信号の受信動作を開始し、前記送信信号を検波することでノイズを検出し、受信開始時から受信信号に含まれた前記ノイズをカウントし、フレームの始まりを示す信号を受信するとノイズカウント値をリセットし、リセット前にノイズカウント値が予め定めた設定値に到達した場合は当該受信動作を中止することを特徴とする。 Further, the present invention is a receiving method of a vehicle communication device that intermittently receives a transmission signal of a plurality of frames continuously transmitted from a transmission side device at a reception side device, and receives the transmission signal at an intermittent reception timing It was started, the detected noise by detecting a transmission signal, and counts the noise included in the received signal from the time of receiving the start, resetting the noise count value when receiving a signal indicating the start of a frame, a reset When the noise count value reaches a preset value previously, the reception operation is stopped.

この構成によれば、受信開始時から受信信号に含まれたノイズをカウントし、フレームの始まりを示す信号を受信するとノイズカウント値をリセットするので、従来技術のように受信開始時からフレームが切り替わっても継続的にノイズカウント数を累積する場合に比べて、受信精度は維持したままで受信中止までのノイズカウント数を低減でき、車両用通信装置の起動時間を短くすることができる。   According to this configuration, the noise included in the received signal is counted from the start of reception, and when the signal indicating the start of the frame is received, the noise count value is reset, so that the frame is switched from the start of reception as in the prior art. However, as compared with the case where the noise count number is continuously accumulated, the noise count number until the reception is stopped can be reduced while maintaining the reception accuracy, and the startup time of the vehicle communication device can be shortened.

本発明によれば、正規の信号として受信可能な状態であればノイズ設定数を小さい値にしても、受信失敗を繰り返すことなく１フレーム分のデータを受信でき、待機時消費電力を抑制することができる。   According to the present invention, as long as the signal can be received as a regular signal, even if the noise setting number is small, data for one frame can be received without repeating reception failure, and standby power consumption is suppressed. Can do.

以下、本発明の実施の形態について添付図面を参照して詳細に説明する。
本実施の形態に係る車両用通信装置は、車両用通信システムにおいて携帯機との間で無線通信する車両側装置に備えられる。
図１は一実施の形態に係る車両用通信装置の全体構成図である。車両用通信装置１は、図示していない携帯機から無線送信された送信信号を受信するアンテナ２を備える。アンテナ２の出力端には帯域フィルタ３が接続されている。帯域フィルタ３は、車両用通信装置１と携帯機との間の無線通信で使用される帯域を通過帯域とし、それ以外を阻止帯域としたバンドパスフィルタで構成することができる。帯域フィルタ３の出力段には検波回路４が接続されている。検波回路４は帯域フィルタ３から出力される受信信号を検波し、検波データを受信信号としてメインＣＰＵ５へ出力する。メインＣＰＵ５は、携帯機との間で無線通信を開始する間欠受信タイミングまではスリープ状態（省電力の待機状態）となっており、間欠受信タイミングで自ら起動して受信信号があるか否かチェックする。間欠受信タイミングはタイマー６から与えられる時間情報を用いて管理する。メインＣＰＵ５は、間欠受信動作時に後述するノイズ判定を実行し、ノイズカウント数が設定値以上であれば受信動作を停止し、逆にノイズカウント数が設定値を超えずに１フレーム分の信号を受信できた場合はデータ信号に含まれたコマンドに基づいてドアロック機構７を制御する。なお、メインＣＰＵ５による制御対象はドアロック機構７に限定されるものではなく、エアコン装置、その他の機器も制御対象となる。図１には車両用通信装置１における受信回路を主に示しているが、携帯機と双方向通信を行う場合には、送信回路を備える。 Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The vehicle communication device according to the present embodiment is provided in a vehicle-side device that performs wireless communication with a portable device in a vehicle communication system.
FIG. 1 is an overall configuration diagram of a vehicle communication device according to an embodiment. The vehicle communication device 1 includes an antenna 2 that receives a transmission signal wirelessly transmitted from a portable device (not shown). A band-pass filter 3 is connected to the output end of the antenna 2. The band filter 3 can be configured by a band pass filter in which a band used in wireless communication between the vehicle communication device 1 and the portable device is a pass band and the other band is a stop band. A detection circuit 4 is connected to the output stage of the bandpass filter 3. The detection circuit 4 detects the reception signal output from the band filter 3 and outputs the detection data to the main CPU 5 as the reception signal. The main CPU 5 is in a sleep state (power-saving standby state) until the intermittent reception timing for starting wireless communication with the portable device, and checks whether or not there is a reception signal activated at the intermittent reception timing. To do. The intermittent reception timing is managed using time information given from the timer 6. The main CPU 5 performs noise determination described later during the intermittent reception operation, stops the reception operation if the noise count number is greater than or equal to the set value, and conversely outputs a signal for one frame without the noise count number exceeding the set value. If it can be received, the door lock mechanism 7 is controlled based on the command included in the data signal. Note that the control target by the main CPU 5 is not limited to the door lock mechanism 7, and air conditioners and other devices are also control targets. FIG. 1 mainly shows a reception circuit in the vehicle communication device 1, but in the case of performing bidirectional communication with a portable device, a transmission circuit is provided.

次に、以上のように構成された本実施の形態における間欠受信時のノイズカウント動作について説明する。
送信側装置となる携帯機は、ロック釦が押されると同一フレームの送信信号を連続して繰り返し送信する（本例では４回）。１フレームは、起動信号（１０パルス程度の矩形波）とデータ信号（携帯機のＩＤ番号、ロック／アンロック等の命令信号）とから構成しているが、フレームの先頭部分に既知パターンの信号が配置されていればデータ構造は限定されない。 Next, the noise counting operation at the time of intermittent reception in the present embodiment configured as described above will be described.
When the lock button is pressed, the portable device serving as the transmission side device continuously and repeatedly transmits the transmission signal of the same frame (four times in this example). One frame is composed of a start signal (rectangular wave of about 10 pulses) and a data signal (command signal such as portable device ID number and lock / unlock). If is arranged, the data structure is not limited.

図２を参照して間欠受信時におけるノイズカウント数のリセットタイミングについて説明する。
図２（ａ）は、前述した図４（ａ）と同様に、送信信号の最初の２フレームを示しており、同図（ｂ）はＦＳＫ変調した送信データの具体例を示している。今、図２（ｂ）に示すようにＦＳＫ変調した送信信号に対して、同図（ｃ）に斜線で示すノイズが混在したものとする。最初のフレームには４つのノイズが混在し、次のフレームには４つのノイズが混在している。また、フレーム間には１つのノイズが存在している。すなわち、図４と同一の送信信号に対して同一のノイズが混在している場合を例示している。また、図２（ｄ）に示す間欠受信タイミングでメインＣＰＵ５が起動される。どのタイミングで受信した場合でも起動信号を受信できるように、間欠受信周期及び１回の受信動作時間が設定されている。 The reset timing of the noise count number at the time of intermittent reception will be described with reference to FIG.
FIG. 2A shows the first two frames of the transmission signal, as in FIG. 4A, and FIG. 2B shows a specific example of FSK-modulated transmission data. Now, as shown in FIG. 2B, it is assumed that the FSK-modulated transmission signal is mixed with noise indicated by hatching in FIG. Four noises are mixed in the first frame, and four noises are mixed in the next frame. There is one noise between frames. That is, the case where the same noise is mixed with the same transmission signal as FIG. 4 is illustrated. Further, the main CPU 5 is activated at the intermittent reception timing shown in FIG. The intermittent reception cycle and one reception operation time are set so that the activation signal can be received at any timing.

受信側となる車両側装置１において、メインＣＰＵ５は、ノイズ検出数が設定値＝６個を越えたら、即座に受信動作を停止して次の間欠受信動作までスリープ状態となるように設定されている。また、メインＣＰＵ５は、ノイズカウント数が設定値を超えることなく、１フレーム分の信号（起動信号からデータ信号の最後まで）を完全に受信できた場合には、受信を終了する。   In the vehicle-side device 1 on the reception side, the main CPU 5 is set so that when the number of detected noise exceeds the set value = 6, the reception operation is immediately stopped and the sleep operation is continued until the next intermittent reception operation. Yes. Further, the main CPU 5 ends the reception when the signal for one frame (from the start signal to the end of the data signal) can be completely received without the noise count exceeding the set value.

今、車両側装置１のメインＣＰＵ５が、図２（ｄ）に示すように、図４（ｄ）と同じタイミングである、最初のフレームの途中の間欠受信タイミング（時刻ｔ１）で起動したものとする。メインＣＰＵ５は、起動開始直後（時刻ｔ１）からノイズのカウントを開始し、最初の起動信号（２番目のフレームの起動信号）を検出したところで、ノイズカウント数をリセットする。また、いずれのタイミングで起動したとしても、１フレーム分の信号を受信するまでに又は次のフレームのフレーム先頭の起動信号を受信するまでに、ノイズカウント数が設定値（＝６）に到達すれば、その時点で受信動作を中止してスリープ状態に移行する。   Now, as shown in FIG. 2D, the main CPU 5 of the vehicle-side device 1 is activated at the intermittent reception timing (time t1) in the middle of the first frame, which is the same timing as FIG. 4D. To do. The main CPU 5 starts counting noise immediately after the start of activation (time t1), and resets the noise count when the first activation signal (the activation signal of the second frame) is detected. In addition, regardless of the timing of activation, the noise count will reach the set value (= 6) before the signal for one frame is received or the activation signal at the head of the next frame is received. For example, the reception operation is stopped at that time and the sleep state is entered.

図２（ｅ）に示すように、次フレームの起動信号を検出したところで、ノイズカウント数をリセットしたことにより、２番目のフレームのデータ信号の先頭付近ではノイズカウント数が０に戻る。２番目のフレームは１フレーム内で４つのノイズしか混在していないので、図２（ｆ）に示すように当該フレームの最後まで受信してもノイズカウント数が３となり、設定値（＝６個）を越えないこととなる。その結果、図２（ｇ）に示すように受信継続することになる。図４に示す従来技術では２番目のフレーム受信の途中で受信失敗となっていたところを、本実施の形態ではフレームの最後まで受信して受信継続することができる。言い換えれば、図４に示す従来技術ではノイズカウント数に対する設定値をさらに大きくしなければ、１フレーム分の信号を受信できないが、本実施の形態では同じ受信精度を維持するのであれば、ノイズカウント数に対する設定値を相対的に小さくすることができ、その分だけ起動時間を短縮できる。たとえば、ＣＰＵの都合により、ノイズカウント数の設定値を大きくできない場合には、従来技術に比べて、受信成功の可能性を高くすることができる。   As shown in FIG. 2 (e), when the activation signal of the next frame is detected, the noise count number is reset to 0 near the beginning of the data signal of the second frame by resetting the noise count number. Since the second frame contains only four noises in one frame, as shown in FIG. 2 (f), even if it is received up to the end of the frame, the noise count becomes 3, and the set value (= 6) ) Will not be exceeded. As a result, the reception is continued as shown in FIG. In the prior art shown in FIG. 4, the reception failure in the middle of the second frame reception can be received and continued in the present embodiment until the end of the frame. In other words, in the prior art shown in FIG. 4, a signal for one frame cannot be received unless the set value for the noise count is further increased. However, in this embodiment, if the same reception accuracy is maintained, the noise count The set value for the number can be made relatively small, and the startup time can be shortened accordingly. For example, if the set value of the noise count cannot be increased due to the convenience of the CPU, the possibility of successful reception can be increased compared to the conventional technique.

図３はＦＳＫ変調された送信信号の検波データに表れるノイズを例示した波形図である。図３（ａ）はＦＳＫ変調された送信信号の波形図であり、同図（ｂ）はノイズが混在した状態を示している。図３（ｂ）に示すように、同位相のノイズが重畳した場合にはノイズパルスが追加されるが、逆位相のノイズが送信信号波形と重なった場合には打ち消されて波形が分割される。メインＣＰＵ５では検波データのパルス幅Ｗ１や、立下りから立ち上がりまでの間隔Ｗ２からノイズを検出している。なお、ノイズ検出の手法はパルス幅Ｗ１や、立下りから立ち上がりまでの間隔Ｗ２を検出するものに限定されない。   FIG. 3 is a waveform diagram illustrating noise appearing in detection data of a transmission signal subjected to FSK modulation. FIG. 3A is a waveform diagram of a transmission signal subjected to FSK modulation, and FIG. 3B shows a state in which noise is mixed. As shown in FIG. 3B, a noise pulse is added when noise with the same phase is superimposed, but when the noise with the opposite phase overlaps with the transmission signal waveform, the waveform is canceled and divided. . The main CPU 5 detects noise from the pulse width W1 of the detection data and the interval W2 from the falling edge to the rising edge. Note that the noise detection method is not limited to detecting the pulse width W1 or the interval W2 from the fall to the rise.

このように本実施の形態によれば、車両側装置１において所定周期で間欠受信すると共に間欠受信により起動した場合は、起動開始直後からノイズカウントを開始し、最初の起動信号（次のフレームの起動信号）を検出したところで、ノイズカウント数をリセットするようにしたので、ノイズカウント数の設定値を小さい値にしても、受信失敗を繰り返すことなく１フレーム分のデータを受信でき、待機時消費電力を抑制することができる。   As described above, according to the present embodiment, when the vehicle-side device 1 intermittently receives signals at a predetermined cycle and is activated by intermittent reception, the noise count is started immediately after the activation is started, and the first activation signal (of the next frame) is started. When the start signal is detected, the noise count number is reset, so even if the noise count number is set to a small value, data for one frame can be received without repeating reception failure, and standby consumption Electric power can be suppressed.

また、以上の説明では、携帯機１０から車両側装置１に対してＦＳＫ変調した送信信号を送信しているが、変調方式はＡＳＫ変調などの他の変調方式を適用することもできる。   In the above description, the FSK-modulated transmission signal is transmitted from the portable device 10 to the vehicle-side device 1, but other modulation schemes such as ASK modulation can be applied as the modulation scheme.

本発明の一実施の形態に係る車両用通信装置の全体構成図1 is an overall configuration diagram of a vehicle communication device according to an embodiment of the present invention. 上記一実施の形態においてノイズカウント数のリセットタイミングを示すタイミング図Timing chart showing reset timing of the noise count number in the above embodiment ノイズ検出原理を説明するための波形図Waveform diagram for explaining the principle of noise detection 従来のノイズ判定動作を説明するためのタイミング図Timing chart for explaining conventional noise judgment operation

符号の説明Explanation of symbols

１…車両用通信装置
２…アンテナ
３…帯域フィルタ
４…検波回路
５…メインＣＰＵ
６…タイマー
７…ドアロック機構 DESCRIPTION OF SYMBOLS 1 ... Vehicle communication apparatus 2 ... Antenna 3 ... Band-pass filter 4 ... Detection circuit 5 ... Main CPU
6 ... Timer 7 ... Door lock mechanism

Claims (3)

フレーム先頭にフレームの始まりを示す信号がそれぞれ配置された送信信号がフレーム毎に連続して送信され、この連続して送信された複数フレームの送信信号を間欠受信する車両用通信装置であって、
それぞれの間欠受信タイミングになると起動して前記送信信号の受信動作を開始し、前記各受信動作中において前記送信信号を検波することで当該送信信号に混在するノイズを個別に検出し、受信開始時から前記検出したノイズをカウントし、前記フレームの始まりを示す信号を受信するとノイズカウント値をリセットし、１フレームの受信動作中におけるリセット前にノイズカウント値が予め定めた設定値に到達した場合は当該受信動作を中止することを特徴とする車両用通信装置。 A vehicle communication device that intermittently receives a transmission signal of a plurality of frames that are transmitted continuously , and a transmission signal in which a signal indicating the start of the frame is arranged at the head of each frame is transmitted continuously for each frame,
When each intermittent reception timing is reached, the transmission signal is started to start reception, and the noise detected in the transmission signal is individually detected by detecting the transmission signal during each reception operation. counting the noise the detected, when receiving the signal indicating the start of the frame to reset the noise count value, if the noise count value before reset during reception operation for one frame has reached the predetermined set value The vehicle communication device, wherein the receiving operation is stopped. 前記フレームは、フレーム先頭にフレームの始まりを示す信号となる起動信号が配置され、起動信号の後にデータ信号が配置されたことを特徴とする請求項１記載の車両用通信装置。 The vehicle communication device according to claim 1, wherein an activation signal that is a signal indicating the start of the frame is arranged at the head of the frame, and a data signal is arranged after the activation signal. 送信側装置からフレーム先頭にフレームの始まりを示す信号がそれぞれ配置された送信信号がフレーム毎に連続して送信され、この連続して送信された複数フレームの送信信号を受信側装置で間欠受信する車両用通信装置の受信方法であって、
それぞれの間欠受信タイミングになると起動して前記送信信号の受信動作を開始し、前記各受信動作中において前記送信信号を検波することで当該送信信号に混在するノイズを個別に検出し、受信開始時から前記検出したノイズをカウントし、前記フレームの始まりを示す信号を受信するとノイズカウント値をリセットし、１フレームの受信動作中におけるリセット前にノイズカウント値が予め定めた設定値に到達した場合は当該受信動作を中止することを特徴とする車両用通信装置の受信方法。 A transmission signal in which a signal indicating the start of a frame is arranged at the head of the frame from the transmission side device is continuously transmitted for each frame, and the transmission signal of the plurality of frames transmitted continuously is intermittently received by the reception side device. A method for receiving a vehicle communication device, comprising:
Start to become each intermittent reception timing to start reception operation of the transmission signal, the noise mixed in the transmission signal is detected separately by detecting a transmission signal in the in the receiving operation when receiving the start counting the noise the detected, when receiving the signal indicating the start of the frame to reset the noise count value, if the noise count value before reset during reception operation for one frame has reached the predetermined set value A receiving method of a vehicular communication device, wherein the receiving operation is stopped.
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