JP7094764B2 - Electronic control device - Google Patents

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JP7094764B2
JP7094764B2 JP2018086459A JP2018086459A JP7094764B2 JP 7094764 B2 JP7094764 B2 JP 7094764B2 JP 2018086459 A JP2018086459 A JP 2018086459A JP 2018086459 A JP2018086459 A JP 2018086459A JP 7094764 B2 JP7094764 B2 JP 7094764B2
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power supply
electronic control
control device
drive circuits
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JP2019189144A (en
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至 田辺
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Hitachi Astemo Ltd
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本発明は、負荷駆動回路を備えた電子制御装置に関する。 The present invention relates to an electronic control device including a load drive circuit.

負荷駆動回路を備えた電子制御装置(ECU:Electronic Control Unit)は、入力信号を処理するための入力回路と、入力信号を最適に処理するマイコンと、処理結果を出力処理するための出力回路を備えている。電子制御装置では、グランド(GND)との接続が切断された場合(例えば、電子制御装置のGND端子とGNDを接続するGND線が断線した場合)、電子制御装置が意図しない動作をすることがある。 An electronic control unit (ECU) equipped with a load drive circuit includes an input circuit for processing input signals, a microcomputer for optimally processing input signals, and an output circuit for outputting processing results. I have. In the electronic control device, when the connection with the ground (GND) is disconnected (for example, when the GND terminal of the electronic control device and the GND line connecting the GND are disconnected), the electronic control device may perform an unintended operation. be.

この種の課題に関し、特許文献1の電子制御装置は、電子制御装置の起動時の通常制御を行う前に、一端が車体GNDに接続された複数のソレノイドと接続する複数のFET(Field Effect Transistor(電界効果トランジスタ))の全てを同時にオン状態にし、その時にGND端子がGNDと非接続状態であった場合、電子制御装置の内部電源を生成する電源生成回路の動作を停止している。 Regarding this kind of problem, the electronic control device of Patent Document 1 has a plurality of FETs (Field Effect Transistors) in which one end is connected to a plurality of solenoids connected to a vehicle body GND before performing normal control at the time of starting the electronic control device. (Field effect transistor)) are all turned on at the same time, and if the GND terminal is not connected to GND at that time, the operation of the power generation circuit that generates the internal power supply of the electronic control device is stopped.

特開2014-19398号公報Japanese Unexamined Patent Publication No. 2014-19398

特許文献1の技術は、電子制御装置のGND端子とGNDとの接続状態を通常制御を行う前(すなわち電子制御装置の起動時)に診断するものである。したがって、通常制御中(すなわち電子制御装置の起動後)にGND端子とGNDが非接続状態になった場合、電子制御装置の意図しない動作を抑止できないという課題がある。 The technique of Patent Document 1 is to diagnose the connection state between the GND terminal of the electronic control device and the GND before performing normal control (that is, at the time of starting the electronic control device). Therefore, when the GND terminal and the GND are disconnected during normal control (that is, after the electronic control device is activated), there is a problem that the unintended operation of the electronic control device cannot be suppressed.

本発明の目的は、通常制御時においてもGND端子とGNDとの接続状態を検知でき、意図しない動作を抑止できる電子制御装置を提供することにある。 An object of the present invention is to provide an electronic control device capable of detecting a connection state between a GND terminal and a GND even during normal control and suppressing an unintended operation.

本願は上記課題を解決する手段を複数含んでいるが、その一例を挙げるならば、電子制御装置であって、前記電子制御装置のグランドラインを外部筐体に接続するグランド端子と、前記電子制御装置の電源ラインを外部電源に接続する電源端子と、一端が前記電源ラインに接続され且つ他端が前記グランドラインに接続され、前記外部筐体に一端がそれぞれ接続された複数の負荷に対して電流を供給することで前記複数の負荷をそれぞれ駆動する複数の駆動回路と、前記複数の駆動回路のそれぞれを制御して前記複数の負荷のそれぞれを駆動する電流を制御する処理装置と、前記グランドラインと前記複数の駆動回路それぞれの他端との間の電圧を検出することで、前記複数の駆動回路に流れる電流の向きをそれぞれ検出する複数の検出装置とを備え、前記複数の駆動回路のそれぞれは、前記処理装置に制御されてオン/オフする上流スイッチング素子及び下流スイッチング素子を有し、前記上流スイッチング素子は、前記下流スイッチング素子よりも前記電源ライン側に配置され、前記複数の駆動回路のそれぞれは、前記上流スイッチング素子と前記下流スイッチング素子の間から前記複数の負荷に電流を供給することで前記複数の負荷をそれぞれ駆動し、前記処理装置は、前記複数の検出装置のいずれかで前記複数の駆動回路に流れる電流の向きが通常状態と異なる向きであることを検出した場合、該流れる電流の向きが通常状態と異なる向きである駆動回路の前記上流スイッチング素子をオフ状態に保持することで、該駆動回路の動作を停止することとする。

The present application includes a plurality of means for solving the above problems, and one example thereof is an electronic control device, which is a ground terminal for connecting a ground line of the electronic control device to an external housing, and the electronic control . For a power supply terminal that connects the power supply line of the device to an external power supply, and for a plurality of loads in which one end is connected to the power supply line and the other end is connected to the ground line and one end is connected to the external housing. A plurality of drive circuits that each drive the plurality of loads by supplying a current, a processing device that controls each of the plurality of drive circuits to control the current that drives each of the plurality of loads, and the ground . A plurality of detection devices for detecting the direction of a current flowing through the plurality of drive circuits by detecting a voltage between the line and the other end of each of the plurality of drive circuits are provided , and the plurality of drive circuits are provided. Each has an upstream switching element and a downstream switching element controlled by the processing device to be turned on / off, and the upstream switching element is arranged on the power supply line side of the downstream switching element and has the plurality of drive circuits. Each of the above-mentioned one drives the plurality of loads by supplying a current from between the upstream switching element and the downstream switching element to the plurality of loads, and the processing device is one of the plurality of detection devices. When it is detected that the direction of the current flowing through the plurality of drive circuits is different from the normal state, the upstream switching element of the drive circuit whose direction of the flowing current is different from the normal state is held in the off state. As a result, the operation of the drive circuit is stopped .

本発明によれば、通常制御時においてもGND端子とGNDとの接続状態を検知できるので、GND端子とGNDが非接続状態になった場合には電子制御装置による意図しない動作の発生を防止するための適切な処置を行うことができる。 According to the present invention, the connection state between the GND terminal and the GND can be detected even during normal control, so that when the GND terminal and the GND are disconnected, the electronic control device prevents an unintended operation from occurring. Appropriate measures can be taken for this.

本発明の実施形態1に係る電子制御装置120の回路図。The circuit diagram of the electronic control apparatus 120 which concerns on Embodiment 1 of this invention. 第1負荷駆動回路40が動作し、負荷132に電流を流す場合の電流経路200を示す図。The figure which shows the current path 200 when the 1st load drive circuit 40 operates and the current flows through the load 132. 第1負荷駆動回路40が動作し、負荷132から電子制御装置120に電流が戻ってくる場合の電流経路300を示す図。The figure which shows the current path 300 when the 1st load drive circuit 40 operates and the current returns from the load 132 to the electronic control apparatus 120. 第1負荷駆動回路40の動作中の電流波形400,410,420,430,440を示す図。The figure which shows the current waveform 400, 410, 420, 430, 440 during operation of the 1st load drive circuit 40. 電子制御装置120のGNDコネクタ80とシステム筐体130のGND端子81間で断線800が発生したときに発生する現象を示す図。The figure which shows the phenomenon which occurs when the disconnection 800 occurs between the GND connector 80 of the electronic control apparatus 120, and the GND terminal 81 of a system housing 130. 本発明の実施形態2に係る電子制御装置120の回路図。The circuit diagram of the electronic control apparatus 120 which concerns on Embodiment 2 of this invention. 本発明の実施形態3に係る電子制御装置120の回路図。The circuit diagram of the electronic control apparatus 120 which concerns on Embodiment 3 of this invention. 本発明の実施形態4に係る電子制御装置120の回路図。The circuit diagram of the electronic control apparatus 120 which concerns on Embodiment 4 of this invention.

以下、本発明の実施の形態について図面を用いて説明する。
<実施形態1>
図1は、本発明の実施形態1に係る車両搭載型の電子制御装置(ECU:Electronic Control Unit)120の回路図である。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<Embodiment 1>
FIG. 1 is a circuit diagram of a vehicle-mounted electronic control unit (ECU) 120 according to the first embodiment of the present invention.

電子制御装置120は、電子制御装置120に電力を供給するための外部電源であるバッテリ100に電源ライン102を介して接続される電源コネクタ(電源端子)10と、導電性のシステム筐体(外部筐体)130上のGNDコネクタ(GND端子)81にGNDライン82を介して接続されるGNDコネクタ(GND端子)80と、複数の負荷(ソレノイド)131,132がそれぞれ出力ライン61,71を介して接続される複数の出力コネクタ(出力端子)60,70を備えている。 The electronic control device 120 includes a power connector (power supply terminal) 10 connected to a battery 100, which is an external power source for supplying electric power to the electronic control device 120, via a power supply line 102, and a conductive system housing (external). The GND connector (GND terminal) 80 connected to the GND connector (GND terminal) 81 on the housing 130 via the GND line 82, and a plurality of loads (solars) 131 and 132 are connected via the output lines 61 and 71, respectively. It is provided with a plurality of output connectors (output terminals) 60 and 70 to be connected to each other.

電源ライン102には、バッテリ110と電子制御装置120の接続を遮断可能な遮断回路(リレー)であるスイッチ110が設けられている。スイッチ110をON状態に設定するとバッテリ110から電子制御装置120への電力供給が可能になり、OFF状態に設定するとバッテリ110から電子制御装置120への電力供給は不可能になる。 The power supply line 102 is provided with a switch 110 which is a cutoff circuit (relay) capable of cutting off the connection between the battery 110 and the electronic control device 120. When the switch 110 is set to the ON state, power can be supplied from the battery 110 to the electronic control device 120, and when the switch 110 is set to the OFF state, power can not be supplied from the battery 110 to the electronic control device 120.

システム筐体(外部筐体)130は、一般的に金属で構成されており、電子制御装置120の外部に配置されている。車両に搭載されるシステム筐体130としては例えばエンジン本体やトランスミッション本体が該当する。本実施形態のシステム筐体130には、複数の負荷131,132がGNDラインを介して接続されるGND端子133と、バッテリ100のGNDラインが接続されるGND端子101と、電子制御装置120のGNDライン82が接続されるGND端子81とが設けられている。他の車載電子制御装置のGNDを接続可能にしても良い。 The system housing (external housing) 130 is generally made of metal and is arranged outside the electronic control device 120. The system housing 130 mounted on the vehicle corresponds to, for example, an engine body or a transmission body. In the system housing 130 of the present embodiment, a GND terminal 133 to which a plurality of loads 131 and 132 are connected via a GND line, a GND terminal 101 to which the GND line of the battery 100 is connected, and an electronic control device 120 are provided. A GND terminal 81 to which the GND line 82 is connected is provided. The GND of another in-vehicle electronic control device may be connectable.

2つの負荷131,132は、それぞれ出力コネクタ60,70を介して電子制御装置120から出力される制御信号(電流)で駆動され、それぞれの一端はGNDラインを介してシステム筐体130のGND端子133に接続されている。 The two loads 131 and 132 are driven by a control signal (current) output from the electronic control device 120 via the output connectors 60 and 70, respectively, and one end of each is a GND terminal of the system housing 130 via the GND line. It is connected to 133.

また、電子制御装置120は、電源コネクタ10を介してバッテリ100に接続され電子制御装置120の内部電源を生成する電源回路20と、電流を供給することで負荷132を駆動する第1駆動回路(第1負荷駆動素子)40と、電流を供給することで負荷131を駆動する第2駆動回路(第2負荷駆動素子)50と、第1駆動回路40及び第2駆動回路50を制御する制御信号を出力して2つの負荷131,132のそれぞれを駆動する電流を制御する処理装置であるCPU(Central Processing Unit)30と、第1駆動回路40に流れる電流の向きを検出する第1電流検出装置である第1電流検出素子45と、第2駆動回路50に流れる電流の向きを検出する第2電流検出装置である第2電流検出素子55を備えている。 Further, the electronic control device 120 includes a power supply circuit 20 that is connected to the battery 100 via the power supply connector 10 to generate an internal power supply for the electronic control device 120, and a first drive circuit that drives the load 132 by supplying an electric current. The first load drive element) 40, the second drive circuit (second load drive element) 50 that drives the load 131 by supplying an electric current, and the control signal that controls the first drive circuit 40 and the second drive circuit 50. CPU (Central Processing Unit) 30, which is a processing device that controls the current that drives each of the two loads 131 and 132, and a first current detection device that detects the direction of the current flowing through the first drive circuit 40. The first current detecting element 45 is provided, and the second current detecting element 55, which is a second current detecting device for detecting the direction of the current flowing through the second drive circuit 50, is provided.

第1駆動回路40は、電源コネクタ10に接続する電源ライン103とGNDコネクタ80に接続するGNDライン83との間に設けられており、電源ライン103側(上流側)に配置されたスイッチング素子である上流FET41と、GNDライン83側(下流側)に配置されたスイッチング素子である下流FET42を備えている。FET41のソースはバッテリ100の電圧が印加される電源ライン103に接続され、FET41のドレインは負荷132の他端に接続されている。FET41はオン状態とオフ状態を切り替えるスイッチとして機能して負荷132に流れる電流を制御する。FET42のソースはGNDライン83に接続され、FET42のドレインは負荷132の他端に接続されている。FET41と同様にFET42はオン状態とオフ状態を切り替えるスイッチとして機能し、FET41がオフ状態に設定されている場合にオン状態に設定されて負荷132からの還流電流を制御する。すなわち、上流FET41がオンのとき下流FET42はオフ、上流FET41がオフのとき下流FET42はオンと、互いのオンオフが常に入れ替わる動きをする。 The first drive circuit 40 is a switching element provided between the power supply line 103 connected to the power supply connector 10 and the GND line 83 connected to the GND connector 80, and is arranged on the power supply line 103 side (upstream side). It includes a certain upstream FET 41 and a downstream FET 42 which is a switching element arranged on the GND line 83 side (downstream side). The source of the FET 41 is connected to the power supply line 103 to which the voltage of the battery 100 is applied, and the drain of the FET 41 is connected to the other end of the load 132. The FET 41 functions as a switch for switching between an on state and an off state, and controls the current flowing through the load 132. The source of the FET 42 is connected to the GND line 83 and the drain of the FET 42 is connected to the other end of the load 132. Like the FET 41, the FET 42 functions as a switch for switching between an on state and an off state, and when the FET 41 is set to the off state, it is set to the on state and controls the return current from the load 132. That is, when the upstream FET 41 is on, the downstream FET 42 is off, and when the upstream FET 41 is off, the downstream FET 42 is on, and the on / off movements of each other are always switched.

同様に、第2駆動回路50は、電源コネクタ10に接続する電源ライン103とGNDコネクタ80に接続するGNDライン83との間に設けられており、電源ライン103側(上流側)に配置されたスイッチング素子である上流FET51と、GNDライン83側(下流側)に配置されたスイッチング素子である下流FET52を備えている。FET51のソースはバッテリ100の電圧が印加される電源ライン103に接続され、FET51のドレインは負荷132の他端に接続されている。FET51はオン状態とオフ状態を切り替えるスイッチとして機能して負荷131に流れる電流を制御する。FET52のソースはGNDライン83に接続され、FET52のドレインは負荷131の他端に接続されている。FET51と同様にFET52はオン状態とオフ状態を切り替えるスイッチとして機能し、FET51がオフ状態に設定されている場合にオン状態に設定されて負荷131からの還流電流を制御する。すなわち、上流FET51がオンのとき下流FET52はオフ、上流FET51がオフのとき下流FET52はオンと、互いのオンオフが常に入れ替わる動きをする。 Similarly, the second drive circuit 50 is provided between the power supply line 103 connected to the power supply connector 10 and the GND line 83 connected to the GND connector 80, and is arranged on the power supply line 103 side (upstream side). It includes an upstream FET 51 which is a switching element and a downstream FET 52 which is a switching element arranged on the GND line 83 side (downstream side). The source of the FET 51 is connected to the power supply line 103 to which the voltage of the battery 100 is applied, and the drain of the FET 51 is connected to the other end of the load 132. The FET 51 functions as a switch for switching between an on state and an off state, and controls the current flowing through the load 131. The source of the FET 52 is connected to the GND line 83, and the drain of the FET 52 is connected to the other end of the load 131. Like the FET 51, the FET 52 functions as a switch for switching between an on state and an off state, and when the FET 51 is set to the off state, it is set to the on state and controls the return current from the load 131. That is, when the upstream FET 51 is on, the downstream FET 52 is off, and when the upstream FET 51 is off, the downstream FET 52 is on, and the on / off movements of each other are always switched.

CPU30は、電源回路20の生成する内部電源により駆動し、第1駆動回路40を制御する制御信号と、第2駆動回路50を制御する制御信号をそれぞれ対象の駆動回路に出力する。第1駆動回路40を制御する制御信号としては、第1駆動回路40内の2つのFET41,42のゲートに対してそれぞれのオン状態とオフ状態を適宜切り替える信号が出力される。同様に第2駆動回路50を制御する制御信号としては、第2駆動回路50内の2つのFET51,52のゲートに対してそれぞれのオン状態とオフ状態を適宜切り替える信号が出力される。 The CPU 30 is driven by the internal power supply generated by the power supply circuit 20, and outputs a control signal for controlling the first drive circuit 40 and a control signal for controlling the second drive circuit 50 to the target drive circuit, respectively. As a control signal for controlling the first drive circuit 40, a signal for appropriately switching between an on state and an off state for the gates of the two FETs 41 and 42 in the first drive circuit 40 is output. Similarly, as a control signal for controlling the second drive circuit 50, a signal for appropriately switching between an on state and an off state for the gates of the two FETs 51 and 52 in the second drive circuit 50 is output.

第1電流検出素子45は、GNDライン83が第1駆動回路40側と第2駆動回路50側に分岐する分岐部よりも上流かつFET42の下流に設けられている。第1電流検出素子45とCPU30は信号線を介して接続されており、第1電流検出素子45で検出された電圧(電流の向きを示す信号)は適宜増幅されてCPU30に出力される。第1電流検出素子45は、図1中の矢印が示す電流の向きを通常状態の向きとして検出し、当該矢印と反対方向の電流の向きを異常状態の向きとして検出する。 The first current detection element 45 is provided upstream of the branch portion where the GND line 83 branches to the first drive circuit 40 side and the second drive circuit 50 side and downstream of the FET 42. The first current detection element 45 and the CPU 30 are connected via a signal line, and the voltage (signal indicating the direction of the current) detected by the first current detection element 45 is appropriately amplified and output to the CPU 30. The first current detecting element 45 detects the direction of the current indicated by the arrow in FIG. 1 as the direction of the normal state, and detects the direction of the current in the direction opposite to the arrow as the direction of the abnormal state.

第2電流検出素子55は、GNDライン83が第1駆動回路40側と第2駆動回路50側に分岐する分岐部よりも上流かつFET52の下流に設けられている。第2電流検出素子55とCPU30は信号線を介して接続されており、第2電流検出素子55で検出された電圧(電流の向きを示す信号)は適宜増幅されてCPU30に出力される。第2電流検出素子55は、図1中の矢印が示す電流の向きを通常状態の向きとして検出し、当該矢印と反対方向の電流の向きを異常状態の向きとして検出する。 The second current detection element 55 is provided upstream of the branch portion where the GND line 83 branches to the first drive circuit 40 side and the second drive circuit 50 side and downstream of the FET 52. The second current detection element 55 and the CPU 30 are connected via a signal line, and the voltage (signal indicating the direction of the current) detected by the second current detection element 55 is appropriately amplified and output to the CPU 30. The second current detecting element 55 detects the direction of the current indicated by the arrow in FIG. 1 as the direction of the normal state, and detects the direction of the current in the direction opposite to the arrow as the direction of the abnormal state.

本実施形態の電子制御装置120のより具体的な動作を図2、図3で示す。
図2は、第1負荷駆動回路40が動作し、負荷132に電流を流す場合の電流経路200を示す。CPU30からの制御信号により、第1負荷駆動回路40の上流FET41をオン状態に設定し、下流FET42をオフ状態に設定すると、図2中の矢印で示すように電子制御装置120から負荷132に電流200が流れる。電流200は、バッテリ電源100から上流FET41を通り、コネクタ60を通り、負荷132を通り、導電性のシステム筐体130に流れる。
More specific operations of the electronic control device 120 of this embodiment are shown in FIGS. 2 and 3.
FIG. 2 shows a current path 200 when the first load drive circuit 40 operates and a current flows through the load 132. When the upstream FET 41 of the first load drive circuit 40 is set to the on state and the downstream FET 42 is set to the off state by the control signal from the CPU 30, the current is applied from the electronic control device 120 to the load 132 as shown by the arrow in FIG. 200 flows. The current 200 flows from the battery power source 100 through the upstream FET 41, through the connector 60, through the load 132, and into the conductive system housing 130.

次に図3は、第1負荷駆動回路40が動作し、負荷132から電子制御装置120に電流が戻ってくる場合の電流経路300を示す。CPU30からの制御信号により、第1負荷駆動回路40の上流FET41をオフ状態に設定し、下流FET42をオン状態に設定すると、図3中の矢印で示すように電子制御装置120から負荷132に電流300が流れる。電流300はいわゆる還流電流であり、電流経路300は、導電性のシステム筐体130を通過し、電子制御装置120のGNDコネクタ80を通過し、負荷駆動回路40の下流FET42を通過し、電子制御装置120のコネクタ60を通過し、負荷132を通過し、導電性のシステム筐体130に流れる。 Next, FIG. 3 shows a current path 300 when the first load drive circuit 40 operates and a current returns from the load 132 to the electronic control device 120. When the upstream FET 41 of the first load drive circuit 40 is set to the off state and the downstream FET 42 is set to the on state by the control signal from the CPU 30, the current is applied from the electronic control device 120 to the load 132 as shown by the arrow in FIG. 300 flows. The current 300 is a so-called recirculation current, and the current path 300 passes through the conductive system housing 130, the GND connector 80 of the electronic control device 120, the downstream FET 42 of the load drive circuit 40, and is electronically controlled. It passes through the connector 60 of the device 120, passes through the load 132, and flows into the conductive system housing 130.

図4に第1負荷駆動回路40の動作中(すなわち図2及び図3の場合)の電流波形400,410,420,430,440を示す。波形400は、上流FET41に対するCPU30の制御信号を示す。波形410は、波形400の制御信号で上流FET41が動作することで負荷132に流れる電流波形を示す。波形420は、下流FET42に対するCPU30の制御信号を示す。波形430は、波形420の制御信号で下流FET42が動作することで負荷132に流れる還流電流波形を示す。波形440は、負荷132に実際に流れる電流(電流波形410と電流波形430の合成電流)の波形を示す。 FIG. 4 shows current waveforms 400, 410, 420, 430, and 440 during operation of the first load drive circuit 40 (that is, in the case of FIGS. 2 and 3). The waveform 400 shows a control signal of the CPU 30 with respect to the upstream FET 41. The waveform 410 shows a current waveform that flows through the load 132 when the upstream FET 41 operates with the control signal of the waveform 400. The waveform 420 indicates a control signal of the CPU 30 with respect to the downstream FET 42. The waveform 430 shows a recirculation current waveform flowing through the load 132 when the downstream FET 42 operates with the control signal of the waveform 420. The waveform 440 shows the waveform of the current actually flowing through the load 132 (the combined current of the current waveform 410 and the current waveform 430).

先述のようにCPU30の制御信号400,420によって、上流FET41がオンのとき下流FET42はオフ、上流FET41がオフのとき下流FET42はオンと、上流FET41と下流FET42は互いのオンオフが常に入れ替わる動きをしており、これにより電流波形410と電流波形430が交互に現れる。その結果、合成電流440は図4のような波形となる。 As described above, according to the control signals 400 and 420 of the CPU 30, the downstream FET 42 is turned off when the upstream FET 41 is on, the downstream FET 42 is turned on when the upstream FET 41 is off, and the upstream FET 41 and the downstream FET 42 are constantly switched on and off. As a result, the current waveform 410 and the current waveform 430 appear alternately. As a result, the combined current 440 has a waveform as shown in FIG.

図5は電子制御装置120のGNDコネクタ80とシステム筐体130のGND端子81間で断線800が発生したときに発生する現象を示す。 FIG. 5 shows a phenomenon that occurs when a disconnection 800 occurs between the GND connector 80 of the electronic control device 120 and the GND terminal 81 of the system housing 130.

図5中の電流経路500は、電子制御装置120のGND端子80とシステム筐体130のGND端子81間で断線800が発生したときの電流経路を示す。断線800が発生することにより図3に示した本来の還流時の電流経路300が流せなくなる。そのため、図5のように上流FET41及び上流FET51がオフ状態で下流FET42及び下流FET52がオン状態の場合、還流電流500は、負荷131を通り、電子制御装置120の出力コネクタ70、負荷駆動回路50の下流FET52、負荷駆動回路40の下流FET42、制御装置120のコネクタ60の順に通って、負荷132に流れる。 The current path 500 in FIG. 5 shows the current path when the disconnection 800 occurs between the GND terminal 80 of the electronic control device 120 and the GND terminal 81 of the system housing 130. Due to the disconnection 800, the original current path 300 at the time of reflux as shown in FIG. 3 cannot flow. Therefore, when the upstream FET 41 and the upstream FET 51 are in the off state and the downstream FET 42 and the downstream FET 52 are in the on state as shown in FIG. 5, the return current 500 passes through the load 131, the output connector 70 of the electronic control device 120, and the load drive circuit 50. The current flows to the load 132 through the downstream FET 52 of the load drive circuit 40, the downstream FET 42 of the load drive circuit 40, and the connector 60 of the control device 120.

このような電流経路500が形成された場合、図3の通常状態では電流の流れない負荷131に電流が流れて動作し得るため、電子制御装置120として意図しない動きをするおそれがある。その結果、電子制御装置120自体にダメージを与えたり、電子制御装置120の制御対象のシステムにダメージを与えたり、また、制御対象のシステムの意図しない動作を引き起こすおそれがある。 When such a current path 500 is formed, a current may flow through the load 131 in which the current does not flow under the normal state of FIG. 3, and the electronic control device 120 may move unintentionally. As a result, the electronic control device 120 itself may be damaged, the controlled system of the electronic control device 120 may be damaged, or an unintended operation of the controlled system may be caused.

しかし、本実施形態の電子制御装置120は、電子制御装置120の第1負荷駆動回路40の還流電流経路に設けられた第1電流検出素子45と、第2負荷駆動回路50の還流電流経路に設けられた第2電流検出素子55を備えている。そして、電子制御装置120のGND断線800発生時には、図5の電流経路500が示すとおり、GND断線していない通常状態(正常時)における電流経路300と逆向きの電流が第2電流検出素子55に流れこととなる。そのため、本実施形態では第2電流検出素子55で電流の向きを検出し、その第2電流検出素子55で通常状態と異なる向きの電流が検出された場合には、GND断線が発生したと判定し、少なくとも第1負荷駆動回路40の動作を停止することとした。 However, the electronic control device 120 of the present embodiment has a first current detection element 45 provided in the recirculation current path of the first load drive circuit 40 of the electronic control device 120 and a recirculation current path of the second load drive circuit 50. The second current detection element 55 provided is provided. When the GND disconnection 800 of the electronic control device 120 occurs, as shown by the current path 500 in FIG. 5, the current in the direction opposite to the current path 300 in the normal state (normal state) without the GND disconnection is the second current detection element 55. It will flow to. Therefore, in the present embodiment, the second current detection element 55 detects the direction of the current, and when the second current detection element 55 detects a current in a direction different from the normal state, it is determined that a GND disconnection has occurred. At least, it was decided to stop the operation of the first load drive circuit 40.

例えば、本実施形態の電子制御装置120において、第2負荷駆動回路50の上流FET51をオフの状態かつ下流FET52をオンの状態に保持して、第1負荷駆動回路40を図4に示した制御信号400,420に従って周期的に動作させる場合を考える。この場合に図5に示したGND断線800が発生したときには、第2電流検出素子55に通常状態とは逆向きの電流が流れ、そのことが第2電流検出素子55からCPU30に出力される電圧によって検知される。逆向きの電流の発生が検知された場合には、GND断線800が発生したとみなして第1負荷駆動回路40の動作を停止させる。すなわち、第1負荷駆動回路40の2つのFET41,42のうち少なくとも上流FET41をオフ状態に保持し、第1負荷駆動回路40から負荷132に対する電流の供給を停止する。これによりGND断線800の発生時にも負荷131に還流電流が流れることが防止されるので、電子制御装置120が予期せぬ動作を起こすことを防止できる。 For example, in the electronic control device 120 of the present embodiment, the upstream FET 51 of the second load drive circuit 50 is held in the off state and the downstream FET 52 is held in the on state, and the first load drive circuit 40 is controlled as shown in FIG. Consider a case where the operation is periodically performed according to the signals 400 and 420. In this case, when the GND disconnection 800 shown in FIG. 5 occurs, a current in the direction opposite to the normal state flows through the second current detection element 55, which is the voltage output from the second current detection element 55 to the CPU 30. Detected by. When the generation of the reverse current is detected, it is considered that the GND disconnection 800 has occurred, and the operation of the first load drive circuit 40 is stopped. That is, at least the upstream FET 41 of the two FETs 41 and 42 of the first load drive circuit 40 is held in the off state, and the supply of current from the first load drive circuit 40 to the load 132 is stopped. As a result, it is possible to prevent the return current from flowing to the load 131 even when the GND disconnection 800 occurs, so that the electronic control device 120 can be prevented from causing an unexpected operation.

以上のように、本実施形態では、第2電流検出素子55で通常状態と逆向きの電流が検出された場合には電子制御装置120のGND断線が発生したとみなして速やかに第1負荷駆動回路40の動作を停止する。これによりGND断線時の還流電流が電子制御装置120自体にダメージを与えたり、電子制御装置120の制御対象のシステムにダメージを与えたり、また、制御対象のシステムに意図しない動作を引き起こすことを阻止できる。 As described above, in the present embodiment, when the second current detection element 55 detects a current in the direction opposite to the normal state, it is considered that the GND disconnection of the electronic control device 120 has occurred and the first load drive is promptly performed. The operation of the circuit 40 is stopped. This prevents the return current at the time of GND disconnection from damaging the electronic control device 120 itself, damaging the controlled system of the electronic control device 120, and causing unintended operation of the controlled system. can.

以下、GND断線800の発生時に負荷駆動回路40の動作を停止する具体的構成のバリエーションについて図6-8を用いて説明する。 Hereinafter, a variation of a specific configuration for stopping the operation of the load drive circuit 40 when the GND disconnection 800 occurs will be described with reference to FIGS. 6-8.

<実施形態2>
図6は本発明の実施形態2に係る車両搭載型の電子制御装置120の回路図である。
<Embodiment 2>
FIG. 6 is a circuit diagram of a vehicle-mounted electronic control device 120 according to the second embodiment of the present invention.

本実施形態の電源回路20は、信号線600を介してCPU30と接続されている。すなわち電源回路20は、信号線600を介してCPU30から出力される制御信号を入力可能になっており、その制御信号に基づいて内部電源の生成を停止可能に構成されている。 The power supply circuit 20 of this embodiment is connected to the CPU 30 via a signal line 600. That is, the power supply circuit 20 can input a control signal output from the CPU 30 via the signal line 600, and can stop the generation of the internal power supply based on the control signal.

CPU30は、第1,第2電流検出素子45,55のいずれかによって通常状態と異なる向きの電流が検出された場合には、信号線600を介して電源回路20に対して内部電源の生成を停止する制御信号を出力する。当該制御信号が入力されると電源回路20は電子制御装置120内への電源供給(例えばCPU30への電源供給)を停止し、これにより第1負荷駆動回路40と第2負荷駆動回路50が停止する。 When the CPU 30 detects a current in a direction different from the normal state by any of the first and second current detection elements 45 and 55, the CPU 30 generates an internal power supply for the power supply circuit 20 via the signal line 600. Outputs a control signal to stop. When the control signal is input, the power supply circuit 20 stops the power supply to the electronic control device 120 (for example, the power supply to the CPU 30), whereby the first load drive circuit 40 and the second load drive circuit 50 stop. do.

すなわち本実施形態によれば、電子制御装置120のGND断線が発生した際、第1電流検出素子45または第2電流検出素子55で逆電流を検出することで、電源回路20による電源供給を停止させることができる。電源回路20の電源供給を停止することで、第1負荷駆動回路40及び第2負荷駆動回路50は停止するため、制御装置120自体にダメージを与えたり、制御装置120の制御対象のシステムにダメージを与えたり、また、制御対象のシステムに意図しない動作を引き起こすことを阻止できる。 That is, according to the present embodiment, when the GND disconnection of the electronic control device 120 occurs, the power supply by the power supply circuit 20 is stopped by detecting the reverse current with the first current detection element 45 or the second current detection element 55. Can be made to. By stopping the power supply of the power supply circuit 20, the first load drive circuit 40 and the second load drive circuit 50 are stopped, so that the control device 120 itself is damaged or the system to be controlled by the control device 120 is damaged. And can prevent the controlled system from causing unintended behavior.

<実施形態3>
図7は本発明の実施形態3に係る車両搭載型の電子制御装置120の回路図である。
<Embodiment 3>
FIG. 7 is a circuit diagram of the vehicle-mounted electronic control device 120 according to the third embodiment of the present invention.

本実施形態の電子制御装置120は、外部電源100に接続され複数の負荷駆動回路40,50への電源供給を遮断可能な遮断回路700を備えている。より具体的には遮断回路700は、電源コネクタ10と第1,第2負荷駆動回路40,50とを接続する電源ライン103上に設置されており、CPU30から出力される制御信号を入力可能なようにCPU30と電気的に接続されている。遮断回路700は、CPU30から出力される制御信号に基づいて複数の負荷駆動回路40,50への電源供給を遮断可能(すなわち、遮断回路700のオン状態とオフ状態を切り替え可能に)に構成されている。 The electronic control device 120 of the present embodiment includes a cutoff circuit 700 that is connected to the external power supply 100 and can cut off the power supply to the plurality of load drive circuits 40 and 50. More specifically, the cutoff circuit 700 is installed on the power supply line 103 connecting the power supply connector 10 and the first and second load drive circuits 40 and 50, and can input a control signal output from the CPU 30. It is electrically connected to the CPU 30 as described above. The cutoff circuit 700 is configured to be able to cut off the power supply to the plurality of load drive circuits 40 and 50 based on the control signal output from the CPU 30 (that is, the cutoff circuit 700 can be switched between the on state and the off state). ing.

CPU30は、第1,第2電流検出素子45,55のいずれかによって通常状態と異なる向きの電流が検出された場合には、遮断回路700に対して遮断回路700をオフ状態に設定する制御信号を出力する。当該制御信号が入力されると第1負荷駆動回路40と第2負荷駆動回路50への電源供給が停止し、これにより第1負荷駆動回路40と第2負荷駆動回路50が停止する。 When the CPU 30 detects a current in a direction different from the normal state by any of the first and second current detection elements 45 and 55, the CPU 30 is a control signal for setting the cutoff circuit 700 to the cutoff circuit 700 in the off state. Is output. When the control signal is input, the power supply to the first load drive circuit 40 and the second load drive circuit 50 is stopped, whereby the first load drive circuit 40 and the second load drive circuit 50 are stopped.

すなわち本実施形態によれば、電子制御装置120のGND断線が発生した際、第1電流検出素子45または第2電流検出素子55で逆電流を検出することで、遮断回路700をオフ状態に設定できる。遮断回路700をオフ状態に設定することで、負荷駆動回路40及び負荷駆動回路50への電源供給が停止され、負荷131、及び負荷132への電流供給が停止するため、制御装置120自体にダメージを与えたり、制御装置120の制御対象のシステムにダメージを与えたり、また、制御対象のシステムに意図しない動作を引き起こすことを阻止できる。 That is, according to the present embodiment, when the GND disconnection of the electronic control device 120 occurs, the cutoff circuit 700 is set to the off state by detecting the reverse current with the first current detection element 45 or the second current detection element 55. can. By setting the cutoff circuit 700 to the off state, the power supply to the load drive circuit 40 and the load drive circuit 50 is stopped, and the current supply to the load 131 and the load 132 is stopped, so that the control device 120 itself is damaged. It is possible to prevent the system to be controlled by the control device 120 from being damaged, or to cause an unintended operation in the system to be controlled.

<実施形態4>
図8は本発明の実施形態4に係る車両搭載型の電子制御装置120の回路図である。
<Embodiment 4>
FIG. 8 is a circuit diagram of the vehicle-mounted electronic control device 120 according to the fourth embodiment of the present invention.

本実施形態のCPU30は、外部電源(バッテリ)100と電子制御装置120の接続を遮断可能な遮断回路110に対して外部電源100と電子制御装置120の接続を遮断する制御信号(すなわち遮断回路110をオフ状態に設定する制御信号)を出力可能に構成されている。 The CPU 30 of the present embodiment is a control signal (that is, a cutoff circuit 110) that cuts off the connection between the external power supply 100 and the electronic control device 120 with respect to the cutoff circuit 110 that can cut off the connection between the external power supply (battery) 100 and the electronic control device 120. It is configured to be able to output a control signal) that sets the off state.

電子制御装置120内には、オン状態の遮断回路110をオフ状態に設定する制御信号を出力し得る遮断指示回路810が設けられている。遮断指示回路810は、CPU30と通信線を介して接続されており、その通信線を介してCPU30から出力される制御信号に従ってオン状態とオフ状態のいずれか一方に切り替えられる。遮断指示回路810の初期状態はオフ状態とする。そして遮断指示回路810がCPU30からの制御信号によってオン状態に設定されると、遮断指示回路810は遮断回路110に対して制御信号を出力する。これにより遮断回路110がオフ状態に設定されて外部電源から電子制御装置120への電力供給が停止されるものとする。 The electronic control device 120 is provided with a cutoff instruction circuit 810 that can output a control signal for setting the cutoff circuit 110 in the on state to the off state. The cutoff instruction circuit 810 is connected to the CPU 30 via a communication line, and is switched to either an on state or an off state according to a control signal output from the CPU 30 via the communication line. The initial state of the cutoff instruction circuit 810 is set to the off state. When the cutoff instruction circuit 810 is set to the ON state by the control signal from the CPU 30, the cutoff instruction circuit 810 outputs a control signal to the cutoff circuit 110. As a result, the cutoff circuit 110 is set to the off state, and the power supply from the external power source to the electronic control device 120 is stopped.

すなわち本実施形態によれば、電子制御装置120のGND断線が発生した際、第1電流検出素子45または第2電流検出素子55で逆電流を検出することで、遮断指示回路810をオン状態に設定し、これにより遮断回路110をオフ状態に設定することができる。遮断回路110をオフ状態に設定することで、電子制御装置120への電源供給が停止され、負荷131、及び負荷132の動作は停止する。これにより、制御装置120自体にダメージを与えたり、制御装置120の制御対象のシステムにダメージを与えたり、また、制御対象のシステムに意図しない動作を引き起こすことを阻止できる。 That is, according to the present embodiment, when the GND disconnection of the electronic control device 120 occurs, the cutoff instruction circuit 810 is turned on by detecting the reverse current with the first current detection element 45 or the second current detection element 55. It can be set so that the cutoff circuit 110 can be set to the off state. By setting the cutoff circuit 110 to the off state, the power supply to the electronic control device 120 is stopped, and the operations of the load 131 and the load 132 are stopped. As a result, it is possible to prevent damage to the control device 120 itself, damage to the controlled system of the control device 120, and unintended operation of the controlled system.

<その他>
なお、本発明は、上記の実施形態のみに限定されるものではなく、その要旨を逸脱しない範囲内の様々な変形例が含まれる。例えば、本発明は、上記の実施形態で説明した全ての構成を備えるものに限定されず、その構成の一部を削除したものも含まれる。また、ある実施形態に係る構成の一部を、他の実施形態に係る構成に追加又は置換することが可能である。
<Others>
The present invention is not limited to the above embodiment, and includes various modifications within the range not deviating from the gist thereof. For example, the present invention is not limited to the one including all the configurations described in the above-described embodiment, and includes the one in which a part of the configurations is deleted. Further, it is possible to add or replace a part of the configuration according to one embodiment with the configuration according to another embodiment.

GND断線800の検出時には、第2負荷駆動回路50の制御も不定になり得るため、第1負荷駆動回路40だけでなく第2負荷駆動回路50も停止することが好ましい。このように第2駆動回路50も停止すると安全性が向上する。 When the GND disconnection 800 is detected, the control of the second load drive circuit 50 may be undefined. Therefore, it is preferable to stop not only the first load drive circuit 40 but also the second load drive circuit 50. If the second drive circuit 50 is also stopped in this way, safety is improved.

電流検出素子45,55は、トランジスタ等の半導体素子で実現され得るが、これと同等の機能をダイオードと抵抗等のディスクリート回路で実現しても良く、各負荷駆動回路40,50の電流の向きが検出可能な装置であれば公知のものに代替可能である。 The current detection elements 45 and 55 can be realized by a semiconductor element such as a transistor, but the same function may be realized by a discrete circuit such as a diode and a resistor, and the direction of the current of each load drive circuit 40 and 50. Can be replaced with a known device as long as it can detect.

上記の各実施形態では、負荷駆動回路40,50が2つの場合について説明したが、3つ異常の負荷駆動回路を備える電子制御装置にも本発明は適用可能である。 In each of the above embodiments, the case where the load drive circuits 40 and 50 are two has been described, but the present invention can also be applied to an electronic control device including three abnormal load drive circuits.

上記の電子制御装置に係る構成は、処理装置(例えばCPU)によって読み出し・実行されることで当該電子制御装置の構成に係る各機能が実現されるプログラム(ソフトウェア)としてもよい。当該プログラムに係る情報は、例えば、半導体メモリ(フラッシュメモリ、SSD等)、磁気記憶装置(ハードディスクドライブ等)及び記録媒体(磁気ディスク、光ディスク等)等に記憶することができる。 The configuration related to the electronic control device may be a program (software) in which each function related to the configuration of the electronic control device is realized by reading and executing by a processing device (for example, a CPU). Information related to the program can be stored in, for example, a semiconductor memory (flash memory, SSD, etc.), a magnetic storage device (hard disk drive, etc.), a recording medium (magnetic disk, optical disk, etc.), or the like.

また、上記の各実施形態の説明では、制御線や通信線は、各実施形態の説明に必要であると解されるものを示したが、必ずしも製品に係る全ての制御線や通信線を示しているとは限らない。実際には殆ど全ての構成が相互に接続されていると考えて良い。 Further, in the description of each of the above embodiments, the control lines and communication lines are shown to be understood to be necessary for the description of each embodiment, but they do not necessarily indicate all the control lines and communication lines related to the product. Not always. In practice, it can be considered that almost all configurations are interconnected.

10…電源コネクタ(電源端子),20…電源回路,30…CPU(処理装置),40…第1負荷駆動回路,41…上流FET,42…下流FET,45…第1電流検出素子(第1電流検出装置),50…第2負荷駆動回路,51…上流FET,52…下流FET,55…第2電流検出素子(第2電流検出装置),60…出力コネクタ(出力端子),70…出力コネクタ(出力端子),80…GNDコネクタ(GND端子),81,101,133…GND端子,100…バッテリ(外部電源),110…遮断回路(スイッチ),120…電子制御装置,130…導電性のシステム筐体,200,300,500…電流経路,400,420…制御信号,410,430,440…電流波形,600…信号線,700…遮断回路,810…遮断指示回路,800…GND断線 10 ... power supply connector (power supply terminal), 20 ... power supply circuit, 30 ... CPU (processing device), 40 ... first load drive circuit, 41 ... upstream FET, 42 ... downstream FET, 45 ... first current detection element (first) Current detection device), 50 ... 2nd load drive circuit, 51 ... upstream FET, 52 ... downstream FET, 55 ... second current detection element (second current detection device), 60 ... output connector (output terminal), 70 ... output Connector (output terminal), 80 ... GND connector (GND terminal), 81, 101, 133 ... GND terminal, 100 ... Battery (external power supply), 110 ... Break circuit (switch), 120 ... Electronic control device, 130 ... Conductive System housing, 200, 300, 500 ... current path, 400, 420 ... control signal, 410, 430, 440 ... current waveform, 600 ... signal line, 700 ... cutoff circuit, 810 ... cutoff instruction circuit, 800 ... GND disconnection

Claims (4)

電子制御装置であって、
前記電子制御装置のグランドラインを外部筐体に接続するグランド端子と、
前記電子制御装置の電源ラインを外部電源に接続する電源端子と、
一端が前記電源ラインに接続され且つ他端が前記グランドラインに接続され、前記外部筐体に一端がそれぞれ接続された複数の負荷に対して電流を供給することで前記複数の負荷をそれぞれ駆動する複数の駆動回路と、
前記複数の駆動回路のそれぞれを制御して前記複数の負荷のそれぞれを駆動する電流を制御する処理装置と、
前記グランドラインと前記複数の駆動回路それぞれの他端との間の電圧を検出することで、前記複数の駆動回路に流れる電流の向きをそれぞれ検出する複数の検出装置とを備え
前記複数の駆動回路のそれぞれは、前記処理装置に制御されてオン/オフする上流スイッチング素子及び下流スイッチング素子を有し、
前記上流スイッチング素子は、前記下流スイッチング素子よりも前記電源ライン側に配置され、
前記複数の駆動回路のそれぞれは、前記上流スイッチング素子と前記下流スイッチング素子の間から前記複数の負荷に電流を供給することで前記複数の負荷をそれぞれ駆動し、
前記処理装置は、前記複数の検出装置のいずれかで前記複数の駆動回路に流れる電流の向きが通常状態と異なる向きであることを検出した場合、該流れる電流の向きが通常状態と異なる向きである駆動回路の前記上流スイッチング素子をオフ状態に保持することで、該駆動回路の動作を停止することを特徴とする電子制御装置。
It ’s an electronic control device.
A ground terminal that connects the ground line of the electronic control device to the external housing,
A power supply terminal that connects the power supply line of the electronic control device to an external power supply,
One end is connected to the power supply line and the other end is connected to the ground line, and the plurality of loads are driven by supplying a current to a plurality of loads having one end connected to the external housing. With multiple drive circuits,
A processing device that controls each of the plurality of drive circuits and controls the current that drives each of the plurality of loads.
A plurality of detection devices for detecting the direction of the current flowing through the plurality of drive circuits by detecting the voltage between the ground line and the other end of each of the plurality of drive circuits are provided .
Each of the plurality of drive circuits has an upstream switching element and a downstream switching element controlled by the processing device to be turned on / off.
The upstream switching element is arranged on the power supply line side of the downstream switching element.
Each of the plurality of drive circuits drives the plurality of loads by supplying a current from between the upstream switching element and the downstream switching element to the plurality of loads.
When the processing device detects that the direction of the current flowing through the plurality of drive circuits is different from the normal state by any of the plurality of detection devices, the direction of the flowing current is different from the normal state. An electronic control device characterized in that the operation of the drive circuit is stopped by holding the upstream switching element of the drive circuit in an off state .
電子制御装置であって、
前記電子制御装置のグランドラインを外部筐体に接続するグランド端子と、
前記電子制御装置の電源ラインを外部電源に接続する電源端子と、
一端が前記電源ラインに接続され且つ他端が前記グランドラインに接続され、前記外部筐体に一端がそれぞれ接続された複数の負荷に対して電流を供給することで前記複数の負荷をそれぞれ駆動する複数の駆動回路と、
前記複数の駆動回路のそれぞれを制御して前記複数の負荷のそれぞれを駆動する電流を制御する処理装置と、
前記グランドラインと前記複数の駆動回路それぞれの他端との間の電圧を検出することで、前記複数の駆動回路に流れる電流の向きをそれぞれ検出する複数の検出装置と
前記外部電源に接続され前記電子制御装置の内部電源を生成する電源回路と、を備え、
前記処理装置は、前記複数の検出装置のいずれかで前記複数の駆動回路に流れる電流の向きが通常状態と異なる向きであることを検出した場合、前記内部電源の生成を停止する信号を前記電源回路に出力し、
前記電源回路は、前記信号が入力されると前記内部電源の生成を停止することを特徴とする電子制御装置。
It ’s an electronic control device.
A ground terminal that connects the ground line of the electronic control device to the external housing,
A power supply terminal that connects the power supply line of the electronic control device to an external power supply,
One end is connected to the power supply line and the other end is connected to the ground line, and the plurality of loads are driven by supplying a current to a plurality of loads having one end connected to the external housing. With multiple drive circuits,
A processing device that controls each of the plurality of drive circuits and controls the current that drives each of the plurality of loads.
A plurality of detection devices that detect the direction of the current flowing through the plurality of drive circuits by detecting the voltage between the ground line and the other end of each of the plurality of drive circuits .
A power supply circuit, which is connected to the external power supply and generates an internal power supply of the electronic control device , is provided.
When the processing device detects that the direction of the current flowing through the plurality of drive circuits is different from the normal state by any of the plurality of detection devices, the processing device outputs a signal for stopping the generation of the internal power supply to the power supply. Output to the circuit,
The power supply circuit is an electronic control device, characterized in that the generation of the internal power supply is stopped when the signal is input .
電子制御装置であって、
前記電子制御装置のグランドラインを外部筐体に接続するグランド端子と、
前記電子制御装置の電源ラインを外部電源に接続する電源端子と、
一端が前記電源ラインに接続され且つ他端が前記グランドラインに接続され、前記外部筐体に一端がそれぞれ接続された複数の負荷に対して電流を供給することで前記複数の負荷をそれぞれ駆動する複数の駆動回路と、
前記複数の駆動回路のそれぞれを制御して前記複数の負荷のそれぞれを駆動する電流を制御する処理装置と、
前記グランドラインと前記複数の駆動回路それぞれの他端との間の電圧を検出することで、前記複数の駆動回路に流れる電流の向きをそれぞれ検出する複数の検出装置と
前記外部電源に接続され前記複数の駆動回路への電源供給を遮断可能な遮断回路と、を備え、
前記処理装置は、前記複数の検出装置のいずれかで前記複数の駆動回路に流れる電流の向きが通常状態と異なる向きであることを検出した場合、前記遮断回路への制御信号を前記遮断回路に出力し、
前記遮断回路は、前記制御信号が入力されると前記複数の駆動回路への電源供給を遮断することを特徴とする電子制御総理。
It ’s an electronic control device.
A ground terminal that connects the ground line of the electronic control device to the external housing,
A power supply terminal that connects the power supply line of the electronic control device to an external power supply,
One end is connected to the power supply line and the other end is connected to the ground line, and the plurality of loads are driven by supplying a current to a plurality of loads having one end connected to the external housing. With multiple drive circuits,
A processing device that controls each of the plurality of drive circuits and controls the current that drives each of the plurality of loads.
A plurality of detection devices that detect the direction of the current flowing through the plurality of drive circuits by detecting the voltage between the ground line and the other end of each of the plurality of drive circuits .
A cutoff circuit connected to the external power source and capable of cutting off the power supply to the plurality of drive circuits is provided.
When the processing device detects that the direction of the current flowing through the plurality of drive circuits is different from the normal state by any of the plurality of detection devices, the control signal to the cutoff circuit is transmitted to the cutoff circuit. Output and
The cutoff circuit is an electronically controlled prime minister characterized in that when a control signal is input , the power supply to the plurality of drive circuits is cut off .
電子制御装置であって、
前記電子制御装置のグランドラインを外部筐体に接続するグランド端子と、
前記電子制御装置の電源ラインを外部電源に接続する電源端子と、
一端が前記電源ラインに接続され且つ他端が前記グランドラインに接続され、前記外部筐体に一端がそれぞれ接続された複数の負荷に対して電流を供給することで前記複数の負荷をそれぞれ駆動する複数の駆動回路と、
前記複数の駆動回路のそれぞれを制御して前記複数の負荷のそれぞれを駆動する電流を制御する処理装置と、
前記グランドラインと前記複数の駆動回路それぞれの他端との間の電圧を検出することで、前記複数の駆動回路に流れる電流の向きをそれぞれ検出する複数の検出装置とを備え
前記処理装置は、前記複数の検出装置のいずれかで前記複数の駆動回路に流れる電流の向きが通常状態と異なる向きであることを検出した場合、前記外部電源と前記電子制御装置の接続を遮断可能な遮断回路に対して前記外部電源と前記電子制御装置の接続を遮断する信号を出力することを特徴とする電子制御装置。
It ’s an electronic control device.
A ground terminal that connects the ground line of the electronic control device to the external housing,
A power supply terminal that connects the power supply line of the electronic control device to an external power supply,
One end is connected to the power supply line and the other end is connected to the ground line, and the plurality of loads are driven by supplying a current to a plurality of loads having one end connected to the external housing. With multiple drive circuits,
A processing device that controls each of the plurality of drive circuits and controls the current that drives each of the plurality of loads.
A plurality of detection devices for detecting the direction of the current flowing through the plurality of drive circuits by detecting the voltage between the ground line and the other end of each of the plurality of drive circuits are provided .
When the processing device detects that the direction of the current flowing through the plurality of drive circuits is different from the normal state in any of the plurality of detection devices, the connection between the external power supply and the electronic control device is cut off. An electronic control device comprising outputting a signal for cutting off the connection between the external power supply and the electronic control device to a possible cutoff circuit.
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