JP2018052378A - Electronic control device for automobile - Google Patents
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本発明は、自動車用電子制御装置に関し、特に、バスオフ検知機能の動作を保証する技術に関する。 The present invention relates to an automobile electronic control device, and more particularly to a technique for guaranteeing the operation of a bus-off detection function.
車載ネットワークの代表的なものとしてＣＡＮ（Ｃｏｎｔｒｏｌｌｅｒ Ａｒｅａ Ｎｅｔｗｏｒｋ）が知られている。ＣＡＮ通信において、伝送路の短絡や断線が発生した場合、通信自体ができなくなるため、伝送路の故障か機器の故障か等を判断することができない。 CAN (Controller Area Network) is known as a typical in-vehicle network. In CAN communication, when a short circuit or disconnection of a transmission path occurs, communication itself cannot be performed, so it cannot be determined whether the transmission path is faulty or a device is faulty.
これに対して、ＣＡＮプロトコルに従った通信を実行するノードに搭載され、通信フレームを送受信する伝送路の異常を検出するものが提案されている。（例えば、特許文献１参照）。 On the other hand, a device that is mounted on a node that performs communication according to the CAN protocol and detects an abnormality in a transmission path for transmitting and receiving communication frames has been proposed. (For example, refer to Patent Document 1).
ところが、特許文献１に記載の技術では、伝送路異常の原因を識別する技術を提供できるが、バスオフ時にバスオフ検知が正しく機能することには記載されていない。 However, although the technique described in Patent Document 1 can provide a technique for identifying the cause of the transmission line abnormality, it is not described that the bus off detection functions correctly when the bus is off.
本発明はこの様な事情を考慮してなされたものであり、従ってその目的は、バスオフ状態を作り出し、バスオフ検知機能が正常に動作することを検出できる診断装置を提供することにある。 The present invention has been made in view of such circumstances. Accordingly, an object of the present invention is to provide a diagnostic device that can create a bus-off state and detect that the bus-off detection function operates normally.
上記課題を解決するために本発明の自動車用電子制御装置は、車両機能を制御するマイコンを有し、通信相手となるマイコンと通信するためのＣＡＮ伝送路を有し、前記ＣＡＮ伝送路の故障状態を検知する故障状態検知機能を有する自動車用電子制御装置であって、
任意のタイミングにおいて前記ＣＡＮ伝送路を故障状態にすることを特徴とする。
In order to solve the above-described problems, an automotive electronic control device of the present invention includes a microcomputer that controls a vehicle function, a CAN transmission path for communicating with a microcomputer that is a communication partner, and a failure of the CAN transmission path. An automotive electronic control device having a failure state detection function for detecting a state,
The CAN transmission path is set in a failure state at an arbitrary timing.
本発明によれば、伝送路が異常状態になった場合においてもバスオフをはじめとする伝送路異常検出装置が正常に動作し、異常時に異常を検知することを保証する技術を提供する。 According to the present invention, there is provided a technique for guaranteeing that a transmission line abnormality detection device such as a bus-off operates normally even when a transmission line is in an abnormal state, and that abnormality is detected at the time of abnormality.
以下に本発明が適用された実施形態について、図面を用いて説明する。 Embodiments to which the present invention is applied will be described below with reference to the drawings.
[全体構成]
本発明が適用されたバスオフ検知機能診断装置を有する自動車用電子制御装置（１）は、図1に示すように、送信データ、受信データの処理を行うマイコン（２）を備え、前記マイコン（２）にはＣＡＮプロトコルの機能を実現するためのＣＡＮコントローラ（３）とバスオフ検知機能（４）を内蔵している。
[overall structure]
As shown in FIG. 1, an automotive electronic control device (1) having a bus-off detection function diagnostic device to which the present invention is applied includes a microcomputer (2) for processing transmission data and reception data. ) Incorporates a CAN controller (3) and a bus-off detection function (4) for realizing the CAN protocol function.
伝送路ＣＡＮ＿Ｈ（１３）と伝送路ＣＡＮ＿Ｌ（１４）にデータを送信するための電圧の発生や調整を行う機能や他のマイコンから伝送路ＣＡＮ＿Ｈ（１３）と伝送路ＣＡＮ＿Ｌ（１４）を介して送信された信号を受信する機能を有するＣＡＮトランシーバ（５）と、伝送路ＣＡＮ＿Ｈ（１３）と伝送路ＣＡＮ＿Ｌ（１４）上の反射電圧の抑制やバスレベル調整用途で使用される終端抵抗（６）を備える。 A function for generating and adjusting a voltage for transmitting data to the transmission path CAN_H (13) and the transmission path CAN_L (14) and transmission from another microcomputer via the transmission path CAN_H (13) and the transmission path CAN_L (14) A CAN transceiver (5) having a function of receiving the received signal, and a terminating resistor (6) used for suppressing reflection voltage on the transmission path CAN_H (13) and the transmission path CAN_L (14) and for adjusting the bus level. Prepare.
終端抵抗（６）は、伝送路ＣＡＮ＿Ｈ（１３）と伝送路ＣＡＮ＿Ｌ（１４）間に接続され、ＣＡＮ伝送路を所定の抵抗値で終端する。ＣＡＮトランシーバ（５）は、ＣＡＮで規定された電気信号を送受信する。この電気信号では、両伝送路ＣＡＮ＿Ｈ（１３）とＣＡＮ＿Ｌ（１４）の電位差が閾値以下である場合がレセッシブであり閾値より大きい場合がドミナントである。 The terminating resistor (6) is connected between the transmission line CAN_H (13) and the transmission line CAN_L (14), and terminates the CAN transmission line with a predetermined resistance value. The CAN transceiver (5) transmits and receives electrical signals defined by CAN. In this electrical signal, the case where the potential difference between both transmission lines CAN_H (13) and CAN_L (14) is less than or equal to the threshold is recessive, and the case where the potential difference is greater than the threshold is dominant.
伝送路ＣＡＮ＿Ｈ（１３）は、電源電圧への短絡による固着と同等の状況を作り出すためのスイッチ（７）と、ＧＮＤ電圧への短絡による固着と同等の状況を作り出すためのスイッチ（１０）が接続される。スイッチ（７）とスイッチ（１０）は、前記マイコン（２）により制御される。 The transmission line CAN_H (13) is connected to a switch (7) for creating a situation equivalent to the fixation due to a short circuit to the power supply voltage and a switch (10) for creating a situation equivalent to the fixation due to a short circuit to the GND voltage. Is done. The switches (7) and (10) are controlled by the microcomputer (2).
伝送路ＣＡＮ＿Ｌ（１４）は、電源電圧への短絡による固着と同等の状況を作り出すためのスイッチ（８）と、ＧＮＤ電圧への短絡による固着と同等の状況を作り出すためのスイッチ（９）が接続される。スイッチ（８）とスイッチ（９）は、前記マイコン（２）により制御される。 The transmission line CAN_L (14) is connected to a switch (8) for creating a situation equivalent to fixing due to a short circuit to the power supply voltage and a switch (9) for creating a situation equivalent to fixing to the GND voltage due to a short circuit. Is done. The switches (8) and (9) are controlled by the microcomputer (2).
伝送路ＣＡＮ＿Ｈ（１３）と伝送路ＣＡＮ＿Ｌ（１４）が短絡した状況を作り出すためのスイッチ（１１）が、伝送路ＣＡＮ＿Ｈ（１３）と伝送路ＣＡＮ＿Ｌ（１４）の間に接続され、前記マイコン（２）により制御される。 A switch (11) for creating a situation in which the transmission path CAN_H (13) and the transmission path CAN_L (14) are short-circuited is connected between the transmission path CAN_H (13) and the transmission path CAN_L (14), and the microcomputer (2 ).
バスオフ検知機能診断を単体のノードで実施する際に伝送路ＣＡＮ＿Ｈ（１３）と伝送路ＣＡＮ＿Ｌ（１４）の接続断するためのスイッチ（１２）が接続され前記マイコン（２）により制御される。 A switch (12) for disconnecting the transmission path CAN_H (13) and the transmission path CAN_L (14) is connected and controlled by the microcomputer (2) when the bus-off detection function diagnosis is performed by a single node.
[バスオフ診断処理シーケンス]
次にマイコン（２）が実行するバスオフ診断処理シーケンスについて、図２のフローチャートを用いて説明する。
[Bus-off diagnosis processing sequence]
Next, the bus-off diagnosis processing sequence executed by the microcomputer (2) will be described with reference to the flowchart of FIG.
本処理では、バスオフ検知機能を保証するために単体ノードでのバスオフ診断処理（Ｓ２０）を実施し、その後全ノードでのバスオフ診断処理（Ｓ５０）を実施する。 In this process, in order to guarantee the bus-off detection function, a bus-off diagnosis process (S20) is performed at a single node, and then a bus-off diagnosis process (S50) is performed at all nodes.
次にマイコン（２）が実行する単体ノードにおけるバスオフ検知機能を診断するために、
バスオフ状態を作り出す処理について、図３のフローチャートを用いて説明する。
Next, in order to diagnose the bus off detection function in the single node executed by the microcomputer (2),
Processing for creating a bus-off state will be described with reference to the flowchart of FIG.
バスオフ状態を作り出す処理では、まず、単体ノードでバスオフ診断処理を実施するにあたり、ＣＡＮ通信が正常に行われていることが前提であるため、バス接続スイッチ（１２）を伝送路ＣＡＮ＿Ｈ（１３）、ＣＡＮ＿Ｌ（１４）のそれぞれに接続する（Ｓ２１）。 In the process of creating the bus off state, first, it is assumed that the CAN communication is normally performed when the bus off diagnosis process is performed in the single node. Therefore, the bus connection switch (12) is connected to the transmission path CAN_H (13), Connection is made to each CAN_L (14) (S21).
正常にＣＡＮ通信ができるか確認するために、通常のＣＡＮ通信送受信を実施し、問題が発生しないことを以下の方法で確認する（Ｓ２２）。 In order to confirm whether CAN communication can be normally performed, normal CAN communication transmission / reception is performed, and it is confirmed by the following method that no problem occurs (S22).
ＣＡＮ通信通常送信確認では、あらかじめ用意したデータをＣＡＮ伝送路に送信し、次のエラーが発生しないことを確認する。受信側ノードがＡＣＫを返すこと（ＡＣＫエラーなし）、アービトレーション・フィールドとＡＣＫスロットを除き、マイコン（２）が出力したビット状態と実際のＣＡＮ伝送路の状態が同様であること（ビットエラーなし）。 In the CAN communication normal transmission confirmation, data prepared in advance is transmitted to the CAN transmission path to confirm that the next error does not occur. The receiving node returns ACK (no ACK error), except for the arbitration field and ACK slot, the bit state output by the microcomputer (2) is the same as the actual CAN transmission path state (no bit error) .
ＣＡＮ通信通常受信確認では、あらかじめ用意されたデータを他のノードがＣＡＮ伝送路に送信し、次のエラーが発生しないことを確認する。受信したＣＲＣ値と受信データから再計算したＣＲＣが同じであること（ＣＲＣエラーなし）、ＥＯＦ，ＩＦＳ，ＣＲＣＤＥＬ，ＡＣＫＤＥＬでドミナントを検出しないこと（フォーマットエラー）、ＳＯＦからＣＲＣＤＥＬの間で５ビット以上連続して同一のデータビットが送信された場合は６ビット目が補数ビットであること（スタッフエラーなし）。 In the CAN communication normal reception confirmation, other nodes transmit data prepared in advance to the CAN transmission path to confirm that the next error does not occur. The received CRC value and the CRC recalculated from the received data are the same (no CRC error), no dominant is detected in EOF, IFS, CRCDEL, ACKDEL (format error), 5 bits or more between SOF and CRCDEL If the same data bit is transmitted continuously, the sixth bit is a complement bit (no stuff error).
また、これらの正常送受信チェック処理の結果を累積し、その累積結果が閾値を超えなければ正常と判断してもよい。例えば、ＣＡＮコントローラ（３）で管理される送信エラーカウントＴＥＣ（Ｔｒａｎｓｍｉｔ Ｅｒｒｏｒ Ｃｏｕｎｔｅｒ）や受信エラーカウンターＲＥＣ（Ｒｅｃｅｉｖｅ Ｅｒｒｏｒ Ｃｏｕｎｅｒ）により閾値の判断を行ってもよい。 Further, the results of these normal transmission / reception check processes may be accumulated, and if the accumulated result does not exceed the threshold value, it may be determined as normal. For example, the threshold may be determined by a transmission error count TEC (Transmit Error Counter) or a reception error counter REC (Receive Error Counter) managed by the CAN controller (3).
ここで送受信チェック（Ｓ２２）がＮＧと判断した場合は、マイコン（２）やＣＡＮコントローラ（３）が既に異常状態であると推測されるため、エラー情報を記録（Ｓ２７）し、バス接続スイッチ（１２）を接続（Ｓ２８）した後、単体ノードでのバスオフ診断処理を終了する。 If it is determined that the transmission / reception check (S22) is NG, it is presumed that the microcomputer (2) and the CAN controller (3) are already in an abnormal state, so error information is recorded (S27), and the bus connection switch ( 12) is connected (S28), the bus-off diagnosis process at the single node is terminated.
送受信チェック（Ｓ２２）がＯＫと判断した場合には、次に、単体ノードでバスオフ検知機能を診断するために、他のノードと切り離すためのバス接続スイッチ（１２）を伝送路ＣＡＮ＿Ｈ（１３）、ＣＡＮ＿Ｌ（１４）それぞれから未接続（ＯＦＦ）状態にする（Ｓ２３）。 If it is determined that the transmission / reception check (S22) is OK, then in order to diagnose the bus off detection function in the single node, the bus connection switch (12) for disconnecting from other nodes is set to the transmission path CAN_H (13), The CAN_L (14) is set in an unconnected (OFF) state (S23).
他のノードと切り離された状態で自動車用電子制御装置（１）においてバスオフ検知機能診断を行うためにバスオフ状態を作成する（Ｓ２４）。ここでバスオフ状態作成方法について図５、図６、図７、図８、図９を用いて説明する。 A bus-off state is created in order to perform a bus-off detection function diagnosis in the automotive electronic control device (1) in a state disconnected from other nodes (S24). Here, the bus-off state creation method will be described with reference to FIGS. 5, 6, 7, 8, and 9.
図５では伝送路ＣＡＮ＿Ｈ（１３）に電源電圧への短絡による固着と同等の状況を作り出すためのスイッチ（７）を接続し、異常状態を表している。 In FIG. 5, a switch (7) for creating a situation equivalent to fixing due to a short circuit to the power supply voltage is connected to the transmission line CAN_H (13) to indicate an abnormal state.
正常状態からスイッチ（７）を伝送路ＣＡＮ＿Ｈ（１３）に接続すると伝送路ＣＡＮ＿Ｈ（１３）は電源電圧への短絡による固着と同等の状況となり、ＣＡＮ通信が正常に行われなくなる。そのため、ＴＥＣ（Ｔｒａｎｓｍｉｔ Ｅｒｒｏｒ Ｃｏｕｎｔｅｒ）はカウントアップされ閾値以上となった時にマイコン（２）に内蔵されるバスオフ検知機能（４）が正しく検知できることを確認する（Ｓ２５）。バスオフ検知が正常に行われなかった場合は、バスオフ検知エラー情報を記録し（Ｓ２７）、バス接続スイッチ（１２）を接続（Ｓ２８）した後、単体ノードでのバスオフ診断処理を終了する。 If the switch (7) is connected to the transmission line CAN_H (13) from the normal state, the transmission line CAN_H (13) becomes equivalent to a situation where it is fixed due to a short circuit to the power supply voltage, and CAN communication is not normally performed. Therefore, when the TEC (Transmit Error Counter) is counted up and exceeds the threshold, it is confirmed that the bus off detection function (4) built in the microcomputer (2) can be detected correctly (S25). If the bus-off detection is not normally performed, the bus-off detection error information is recorded (S27), the bus connection switch (12) is connected (S28), and then the bus-off diagnosis process at the single node is terminated.
図６では伝送路ＣＡＮ＿Ｈ（１３）に電源電圧への短絡による固着と同等の状況を作り出すためのスイッチ（７）を接続し、且つ伝送路ＣＡＮ＿Ｌ（１４）に電源電圧への短絡による固着と同等の状況を作り出すためのスイッチ（８）を接続する。 In FIG. 6, a switch (7) is connected to the transmission line CAN_H (13) to create a situation equivalent to the fixation due to the short circuit to the power supply voltage, and the transmission line CAN_L (14) is equivalent to the fixation due to the short circuit to the power supply voltage. The switch (8) for creating the situation is connected.
また、ＣＡＮ伝送路の状態を正常動作時とスイッチ（７）及びスイッチ（８）を伝送路ＣＡＮ＿Ｈ（１３）と伝送路ＣＡＮ＿Ｌ（１４）に接続した場合の異常状態を表している。 Further, the CAN transmission path is shown in an abnormal state when the normal operation is performed and when the switch (7) and the switch (8) are connected to the transmission path CAN_H (13) and the transmission path CAN_L (14).
正常状態からスイッチ（７）を伝送路ＣＡＮ＿Ｈ（１３）に接続すると伝送路ＣＡＮ＿Ｈ（１３）は電源電圧への短絡による固着と同等の状況となり、また、スイッチ（８）を伝送路ＣＡＮ＿Ｌ（１４）に接続すると伝送路ＣＡＮ＿Ｌ（１４）は電源電圧への短絡による固着と同等の状況となり、ＣＡＮ通信が正常に行われなくなる。これにより、ＴＥＣ（Ｔｒａｎｓｍｉｔ Ｅｒｒｏｒ Ｃｏｕｎｔｅｒ）はカウントアップされ閾値以上となった時にマイコン（２）に内蔵されるバスオフ検知機能（４）が正しく検知できることを確認する（Ｓ２５）。バスオフ検知が正常に行われなかった場合は、バスオフ検知エラー情報を記録し（Ｓ２７）、バス接続スイッチ（１２）を接続（Ｓ２８）した後、単体でのバスオフ診断処理を終了する。 When the switch (7) is connected to the transmission line CAN_H (13) from the normal state, the transmission line CAN_H (13) is in a situation equivalent to fixing due to a short circuit to the power supply voltage, and the switch (8) is connected to the transmission line CAN_L (14). When connected to the transmission line, the transmission path CAN_L (14) is in a situation equivalent to that due to a short circuit to the power supply voltage, and CAN communication is not normally performed. Thereby, when the TEC (Transmit Error Counter) is counted up and exceeds the threshold value, it is confirmed that the bus off detection function (4) built in the microcomputer (2) can be detected correctly (S25). If the bus-off detection is not normally performed, the bus-off detection error information is recorded (S27), the bus connection switch (12) is connected (S28), and then the bus-off diagnosis process alone is terminated.
図７では伝送路ＣＡＮ＿Ｈ（１３）に電源電圧への短絡による固着と同等の状況を作り出すためのスイッチ（７）を接続し、且つ伝送路ＣＡＮ＿Ｌ（１４）にＧＮＤ電圧への短絡による固着と同等の状況を作り出すためのスイッチ（９）を接続する。また、ＣＡＮ伝送路の状態を正常動作時とスイッチ（７）及びスイッチ（９）を伝送路ＣＡＮ＿Ｈ（１３）と伝送路ＣＡＮ＿Ｌ（１４）に接続した場合の異常状態を表している。 In FIG. 7, a switch (7) is connected to the transmission line CAN_H (13) to create a situation equivalent to the fixation due to the short circuit to the power supply voltage, and the transmission line CAN_L (14) is equivalent to the fixation due to the short circuit to the GND voltage. The switch (9) for creating the situation is connected. Further, the CAN transmission path is shown in an abnormal state when the normal operation is performed and when the switch (7) and the switch (9) are connected to the transmission path CAN_H (13) and the transmission path CAN_L (14).
正常状態からスイッチ（７）を伝送路ＣＡＮ＿Ｈ（１３）に接続すると伝送路ＣＡＮ＿Ｈ（１３）は電源電圧への短絡による固着と同等の状況となり、また、スイッチ（９）を伝送路ＣＡＮ＿Ｌ（１４）に接続すると伝送路ＣＡＮ＿Ｌ（１４）はＧＮＤ電圧への短絡による固着と同等の状況となり、ＣＡＮ通信が正常に行われなくなる。これにより、ＴＥＣはカウントアップされ閾値以上となった時にマイコン（２）に内蔵されるバスオフ検知機能（４）が正しく検知できることを確認する（Ｓ２５）。バスオフ検知が正常に行われなかった場合は、バスオフ検知エラー情報を記録し（Ｓ２７）、バス接続スイッチ（１２）を接続（Ｓ２８）した後、単体ノードでのバスオフ診断処理を終了する。 When the switch (7) is connected to the transmission line CAN_H (13) from the normal state, the transmission line CAN_H (13) is in a situation equivalent to fixing due to a short circuit to the power supply voltage, and the switch (9) is connected to the transmission line CAN_L (14). When connected to, the transmission path CAN_L (14) is in a situation equivalent to that due to a short circuit to the GND voltage, and CAN communication is not normally performed. Thereby, it is confirmed that the bus off detection function (4) built in the microcomputer (2) can be correctly detected when the TEC is counted up and exceeds the threshold (S25). If the bus-off detection is not normally performed, the bus-off detection error information is recorded (S27), the bus connection switch (12) is connected (S28), and then the bus-off diagnosis process at the single node is terminated.
図８では伝送路ＣＡＮ＿Ｈ（１３）に電源電圧への短絡による固着と同等の状況を作り出すためのスイッチ（７）を接続し、且つ伝送路ＣＡＮ＿Ｈ（１３）にＧＮＤ電圧への短絡による固着と同等の状況を作り出すためのスイッチ（１０）を接続する。 In FIG. 8, the switch (7) is connected to the transmission line CAN_H (13) to create a situation equivalent to the fixation due to the short circuit to the power supply voltage, and the transmission line CAN_H (13) is equivalent to the fixation due to the short circuit to the GND voltage. The switch (10) for creating the situation is connected.
また、ＣＡＮ伝送路の状態を正常動作時とスイッチ（７）及びスイッチ（１０）を伝送路ＣＡＮ＿Ｈ（１３）に接続した場合の異常状態を表している。 Further, the CAN transmission path is shown in an abnormal state when it is operating normally and when the switch (7) and the switch (10) are connected to the transmission path CAN_H (13).
正常状態からスイッチ（７）とスイッチ（１０）を伝送路ＣＡＮ＿Ｈ（１３）に接続すると伝送路ＣＡＮ＿Ｈ（１３）はプルアップ抵抗、プルダウン抵抗が同じであれば中間電圧で固着と同等の状況となり、ＣＡＮ通信が正常に行われなくなる。これにより、ＴＥＣ（Ｔｒａｎｓｍｉｔ Ｅｒｒｏｒ Ｃｏｕｎｔｅｒ）はカウントアップされ閾値以上となった時にマイコン（２）に内蔵されるバスオフ検知機能（４）が正しく検知できることを確認する（Ｓ２５）。バスオフ検知が正常に行われなかった場合は、バスオフ検知エラー情報を記録し（Ｓ２７）、バス接続スイッチ（１２）を接続（Ｓ２８）した後、単体でのバスオフ診断処理を終了する。 When the switch (7) and the switch (10) are connected to the transmission line CAN_H (13) from the normal state, the transmission line CAN_H (13) is equivalent to fixing with an intermediate voltage if the pull-up resistance and the pull-down resistance are the same. CAN communication is not performed normally. Thereby, when the TEC (Transmit Error Counter) is counted up and exceeds the threshold value, it is confirmed that the bus off detection function (4) built in the microcomputer (2) can be detected correctly (S25). If the bus-off detection is not normally performed, the bus-off detection error information is recorded (S27), the bus connection switch (12) is connected (S28), and then the bus-off diagnosis process alone is terminated.
図９では伝送路ＣＡＮ＿Ｈ（１３）と伝送路ＣＡＮ＿Ｌ（１４）を短絡するための状況を作り出すためのスイッチ（１１）を接続する。また、ＣＡＮ伝送路の状態を正常動作時とスイッチ（１１）を伝送路ＣＡＮ＿Ｈ（１３）と伝送路ＣＡＮ＿Ｌ（１４）を接続した場合の異常状態を表している。 In FIG. 9, a switch (11) for creating a situation for short-circuiting the transmission path CAN_H (13) and the transmission path CAN_L (14) is connected. Further, the CAN transmission path is in an abnormal state when the transmission line CAN_H (13) and the transmission path CAN_L (14) are connected with the switch (11) during normal operation.
正常状態からスイッチ（１１）を接続することにより伝送路ＣＡＮ＿Ｈ（１３）と伝送路ＣＡＮ＿Ｌ（１４）が接続され、ＣＡＮ通信が正常に行われなくなる。これにより、ＴＥＣ（Ｔｒａｎｓｍｉｔ Ｅｒｒｏｒ Ｃｏｕｎｔｅｒ）はカウントアップされ閾値以上となった時にマイコン（２）に内蔵されるバスオフ検知機能（４）が正しく検知できることを確認する（Ｓ２５）。バスオフ検知が正常に行われなかった場合は、バスオフ検知エラー情報を記録し（Ｓ２７）、バス接続スイッチ（１２）を接続（Ｓ２８）した後、単体でのバスオフ診断処理を終了する。 By connecting the switch (11) from the normal state, the transmission path CAN_H (13) and the transmission path CAN_L (14) are connected, and the CAN communication is not normally performed. Thereby, when the TEC (Transmit Error Counter) is counted up and exceeds the threshold value, it is confirmed that the bus off detection function (4) built in the microcomputer (2) can be detected correctly (S25). If the bus-off detection is not normally performed, the bus-off detection error information is recorded (S27), the bus connection switch (12) is connected (S28), and then the bus-off diagnosis process alone is terminated.
図５、図６、図７、図８、図９で示したバスオフ状態作成方法でバスオフ状態にしたのち、正常状態へ復帰するために、ノードをＣＡＮ伝送路に接続するためのスイッチ（１２）以外のスイッチ（７）、スイッチ（８）、スイッチ（９）、スイッチ（１０）、スイッチ（１１）をＯＦＦにし正常状態へ復帰する（Ｓ２６）。またノードをＣＡＮ伝送路に接続するためのスイッチ（１２）を接続する（Ｓ２８）。 A switch (12) for connecting a node to a CAN transmission line in order to return to a normal state after the bus is turned off by the bus off state creation method shown in FIGS. 5, 6, 7, 8, and 9. The other switches (7), (8), (9), (10) and (11) are turned off to return to the normal state (S26). Further, a switch (12) for connecting the node to the CAN transmission path is connected (S28).
次に図４で全ノードでのバスオフ診断処理を行うが、バス接続スイッチ（１２）を接続（Ｓ５１）した状態で正常送受信チェック（Ｓ５２）、バスオフ状態作成（Ｓ５３）、バスオフ状態でのバスオフ検知（Ｓ５４）、バスオフ状態から正常状態へ復帰（Ｓ５５）するものであり上記説明と同等である。 Next, in FIG. 4, the bus off diagnosis process is performed in all nodes. With the bus connection switch (12) connected (S51), the normal transmission / reception check (S52), the bus off state creation (S53), and the bus off detection in the bus off state are performed. (S54), returning from the bus-off state to the normal state (S55), which is equivalent to the above description.
[効果]
以上詳述したように、伝送路ＣＡＮ＿Ｈ（１３）と伝送路ＣＡＮ＿Ｌ（１４）に異常状態を作り出すことにより伝送路異常検出装置が正常に動作しているかが判別でき、さらに異常時に異常を検知することを保証することができる。
[effect]
As described above in detail, it is possible to determine whether the transmission line abnormality detection device is operating normally by creating an abnormal state in the transmission line CAN_H (13) and the transmission line CAN_L (14), and to detect an abnormality when an abnormality occurs. Can be guaranteed.
[他の実施形態]
以上、本発明の実施形態について説明したが、本発明は上記実施形態に限定されることなく、種々の形態をとり得る。
（１） 上記実施形態では、単体ノードでのバスオフ診断処理（Ｓ２０）と全ノードでの
バスオフ診断処理（Ｓ５０）を実施したが、単体ノードでのバスオフ診断処理（Ｓ２０）のみや全ノードでのバスオフ診断処理（Ｓ５０）のみと個別で実施でもよい。
（２） 上記実施形態では、正常送受信チェック（Ｓ２２）ＮＧ時、バスオフ状態でのバスオフ検知（Ｓ２５）及びバスオフ状態から正常状態へ復帰（Ｓ２６）時にＮＧとなった場合にエラー記録を行っているが、例えば２回以上連続してＮＧとなった場合にエラー記録をするようにしてもよい。
（３） 上記実施形態のおける一つの構成要素が有する機能を複数の構成要素として分散させたり、複数の構成要素が有する機能を一つの構成要素に統合させたりしてもよい。また、上記実施形態の構成の一部を省略してもよい。また、上記実施形態の構成の少なくとも一部を他の上記実施形態の構成に対して付加又は置換してもよい。ほお、特許請求の範囲に記載した文言のみによって特定される技術思想に含まれるあらゆる形態が本発明の実施形態である。
[Other embodiments]
As mentioned above, although embodiment of this invention was described, this invention can take a various form, without being limited to the said embodiment.
(1) In the above embodiment, the bus-off diagnosis process (S20) at a single node and the bus-off diagnosis process (S50) at all nodes are performed. However, only the bus-off diagnosis process (S20) at a single node or at all nodes is performed. Only the bus-off diagnosis process (S50) may be performed separately.
(2) In the above embodiment, error recording is performed when the normal transmission / reception check (S22) is NG, the bus off is detected in the bus off state (S25), and when the bus is off from the bus off state to the normal state (S26). However, for example, error recording may be performed when NG occurs continuously two or more times.
(3) The functions of one component in the above embodiment may be distributed as a plurality of components, or the functions of a plurality of components may be integrated into one component. Moreover, you may abbreviate | omit a part of structure of the said embodiment. Further, at least a part of the configuration of the above embodiment may be added to or replaced with the configuration of the other embodiment. Any form included in the technical idea specified only by the words described in the claims is an embodiment of the present invention.
１…自動車用電子制御装置
２…マイクロコンピュータ(マイコン)
３…ＣＡＮコントローラ
４…バスオフ検知機能
５…ＣＡＮトランシーバ
６…終端抵抗
７…伝送路ＣＡＮ＿Ｈと電源電圧を接続するためのスイッチ
８…伝送路ＣＡＮ＿Ｌと電源電圧を接続するためのスイッチ
９…伝送路ＣＡＮ＿ＬとＧＮＤ電圧を接続するためのスイッチ
１０…伝送路ＣＡＮ＿ＨとＧＮＤ電圧を接続するためのスイッチ
１１…伝送路ＣＡＮ＿Ｈと伝送路ＣＡＮ＿Ｌを短絡するためのスイッチ
１２…ノードをＣＡＮ伝送路に接続するためのスイッチ
DESCRIPTION OF SYMBOLS 1 ... Automotive
DESCRIPTION OF
Claims (7)
通信相手となるマイコンと通信するためのＣＡＮ伝送路を有し、
前記ＣＡＮ伝送路の故障状態を検知する故障状態検知機能を有する自動車用電子制御装置であって、
任意のタイミングにおいて前記ＣＡＮ伝送路を故障状態にする
ことを特徴とする自動車用電子制御装置 Has a microcomputer to control the vehicle function,
It has a CAN transmission line for communicating with the microcomputer that is the communication partner,
An automotive electronic control device having a failure state detection function of detecting a failure state of the CAN transmission path,
An electronic control device for an automobile, characterized in that the CAN transmission path is brought into a failure state at an arbitrary timing.
ことを特徴とする請求項１に記載の自動車用電子制御装置。 The automotive electronic control device according to claim 1, wherein the CAN transmission path is brought into a failure state under the control of the microcomputer.
ことを特徴とする請求項１又は２に記載の自動車用電子制御装置。 The automotive electronic control device according to claim 1, wherein the CAN transmission path is brought into a failure state by applying a voltage under the control of the microcomputer.
前記マイコンの制御により故障状態から復帰する
ことを特徴とする請求項１又は２に記載の自動車用電子制御装置 The failure state of the CAN transmission path is
The automobile electronic control device according to claim 1, wherein the vehicle is restored from a failure state under the control of the microcomputer.
前記マイコンの制御により故障状態から復帰する際に電圧印加を解除してから前記ＣＡＮ伝送路に設けられたスイッチを接続することを特徴とする請求項３に記載の自動車用電子制御装置。 The failure state of the CAN transmission path is
4. The electronic control device for an automobile according to claim 3, wherein a switch provided in the CAN transmission line is connected after the voltage application is canceled when the microcomputer is restored from the failure state.
ことを特徴とする請求項１から３に記載の自動車用電子制御装置 The automotive electronic control device according to claim 1, wherein the failure state is a bus-off state.
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| JP2011161947A (en) * | 2010-02-04 | 2011-08-25 | Suzuki Motor Corp | Automatic inspection system of electronic controller |
| JP2016020185A (en) * | 2014-07-15 | 2016-02-04 | 株式会社デンソー | Transmission line abnormality detector |
| JP2016126716A (en) * | 2015-01-08 | 2016-07-11 | 株式会社デンソー | Electronic control device |
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| JP2011161947A (en) * | 2010-02-04 | 2011-08-25 | Suzuki Motor Corp | Automatic inspection system of electronic controller |
| JP2016020185A (en) * | 2014-07-15 | 2016-02-04 | 株式会社デンソー | Transmission line abnormality detector |
| JP2016126716A (en) * | 2015-01-08 | 2016-07-11 | 株式会社デンソー | Electronic control device |
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