JP5239831B2 - Abnormality judgment control device - Google Patents

Abnormality judgment control device Download PDF

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JP5239831B2
JP5239831B2 JP2008326462A JP2008326462A JP5239831B2 JP 5239831 B2 JP5239831 B2 JP 5239831B2 JP 2008326462 A JP2008326462 A JP 2008326462A JP 2008326462 A JP2008326462 A JP 2008326462A JP 5239831 B2 JP5239831 B2 JP 5239831B2
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肇 恒川
浩恭 鈴木
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Mitsubishi Motors Corp
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Description

本発明は、電気自動車等に用いられ、高電圧回路と低電圧回路との間の漏電の有無を検出する異常判定制御装置に関し、特に断線を検出することができるものに関する。 The present invention relates to an abnormality determination control device that is used in an electric vehicle or the like and detects the presence or absence of leakage between a high-voltage circuit and a low-voltage circuit, and particularly relates to an apparatus that can detect a disconnection.

電気自動車やエンジンとモータを備えたハイブリッド車両等（以下、「電動車両」と称する）においては、リチウムイオン二次電池等の高電圧バッテリを駆動源としてモータを駆動制御するための高電圧回路と、鉛蓄電池等の低電圧バッテリを駆動源として音響機器などの電子機器を駆動するための低電圧回路とを有している。また、高電圧回路には、モータ駆動用のインバータが含まれている。   In an electric vehicle, a hybrid vehicle including an engine and a motor (hereinafter referred to as “electric vehicle”), a high voltage circuit for driving and controlling a motor using a high voltage battery such as a lithium ion secondary battery as a drive source; And a low voltage circuit for driving an electronic device such as an acoustic device using a low voltage battery such as a lead storage battery as a drive source. The high voltage circuit includes an inverter for driving the motor.

電動車両では、人体に対する安全性を確保するため、高電圧回路側から低電圧回路側への漏電を検出し、漏電が検出された場合、高電圧バッテリからの電力を遮断することが必要とされ、各種の漏電検出装置が開発されている（例えば、特許文献１参照）。
特許３９８６８２３号公報 In an electric vehicle, in order to ensure safety to the human body, it is necessary to detect a leakage from the high voltage circuit side to the low voltage circuit side and to cut off the power from the high voltage battery when a leakage is detected. Various types of leakage detection devices have been developed (see, for example, Patent Document 1).
Japanese Patent No. 3986823

上述した漏電検出装置では、次のような問題があった。すなわち、信号発生器から出力される信号の周波数は、例えば１Ｈｚという低周波数に固定されている。これは、信号発生器からの信号に、結合コンデンサを介して重畳されるノイズとして、インバータにより発生するｋＨｚオーダのスイッチングノイズがあり、このノイズをＬＰＦ（ローパスフィルタ）で十分に減衰させるには、信号発生器で発生させる信号を１Ｈｚという低周波数に設定させる必要があるためである。このため、始動時において、イグニッションキースイッチをオンにしてから漏電の有無を検出するまでに要する時間が長くなる、という問題があった。   The above-described leakage detection device has the following problems. That is, the frequency of the signal output from the signal generator is fixed at a low frequency of 1 Hz, for example. This is because there is switching noise in the order of kHz generated by the inverter as noise superimposed on the signal from the signal generator via the coupling capacitor. In order to sufficiently attenuate this noise with an LPF (low pass filter), This is because the signal generated by the signal generator needs to be set to a low frequency of 1 Hz. For this reason, at the time of starting, there is a problem that it takes a long time to turn on the ignition key switch and detect the presence or absence of leakage.

一方、これを解決するために、可変周波数（例えば、１Ｈｚから１００ｋＨｚの範囲）の信号発生器を設けるとともに、遮断周波数が可変（例えば、１Ｈｚから１００ｋＨｚの範囲）のＬＰＦ（ｆｃ可変）を設けた点と、低電圧回路側のスイッチがオン操作されて漏電検出部が漏電の有無を検出するまでの間、高電圧回路側のスイッチをオフ状態にし、信号発生器の周波数とＬＰＦの遮断周波数を通常動作時（１Ｈｚ）よりも高く（例えば、１０ｋＨｚから１００ｋＨｚの範囲で）設定することで、電動車両の始動時において高速な漏電検出を可能とするものがあった。   On the other hand, in order to solve this, a signal generator having a variable frequency (for example, a range from 1 Hz to 100 kHz) and an LPF (fc variable) having a variable cutoff frequency (for example, a range from 1 Hz to 100 kHz) are provided. Until the point and the switch on the low voltage circuit side are turned on until the leakage detector detects the presence or absence of leakage, turn off the switch on the high voltage circuit side and set the frequency of the signal generator and the cutoff frequency of the LPF. There are some which can detect electric leakage at high speed when starting an electric vehicle by setting it higher than normal operation (1 Hz) (for example, in a range of 10 kHz to 100 kHz).

このような漏電検出装置はいずれも所定の信号を回路に送り、戻ってきた信号を受信し、発信信号と受信信号の信号強度がほぼ一致すれば漏電が発生していないと判定していた。   All such leakage detection devices send a predetermined signal to the circuit, receive the returned signal, and determine that no leakage has occurred if the signal intensity of the transmission signal and the reception signal substantially match.

しかしながら、何らかの理由で回路内部で断線等の異常が合った場合も発信信号と受信信号がほぼ同じ強度となる。このため、漏電が無かった場合と同様に、高電圧回路が正常であると判定してしまう虞があった。   However, even if an abnormality such as a disconnection occurs in the circuit for some reason, the transmission signal and the reception signal have almost the same strength. For this reason, there is a possibility that the high voltage circuit may be determined to be normal as in the case where there is no leakage.

そこで、本発明は、漏電の有無を判定できるとともに、回路内部の異常も検出することができる異常判定制御装置を提供することを目的とする。 Therefore, an object of the present invention is to provide an abnormality determination control device that can determine whether or not there is a leakage and can also detect an abnormality in a circuit.

前記課題を解決し目的を達成するために、本発明の異常判定制御装置は次のように構成されている。 In order to solve the problems and achieve the object, the abnormality determination control device of the present invention is configured as follows.

前記の課題を解決する第１の発明（請求項１に対応）に係る異常判定制御装置は、高電圧機器を含む高電圧回路及び前記高電圧より低い低電圧機器を含む低電圧回路で構成された電気回路における異常の有無を検出する異常判定制御装置において、前記高電圧回路側に配置されて前記高電圧機器と前記高電圧回路の接地との間に配設されるＹコンデンサと、前記低電圧回路側に配置されて高周波信号及び低周波信号を発生し、重畳して出力する信号発生器と、前記信号発生器の出力端と前記高電圧回路との間に接続されたコンデンサと、前記Ｙコンデンサ及び前記コンデンサを通過可能な高周波信号を検知する高周波判定回路と、前記Ｙコンデンサは通過不可能で且つ前記コンデンサは通過可能な低周波信号を検知する低周波判定回路と、前記低電圧回路側に配置されて前記信号発生器の出力端に接続され、所定の周波数を基準として高周波と低周波を分けて、それぞれ前記高周波判定回路及び前記低周波判定回路に入力するフィルタと、前記高電圧回路側に配置されて前記高電圧機器への電力供給を可能とするコンタクタとを備え、前記コンタクタの断接に応じて前記高周波信号と前記低周波信号とを判別し、前記低周波信号で前記電気回路の漏電異常判定を実施し、前記高周波信号で前記電気回路の断線異常判定を実施することを特徴とする。
前記の課題を解決する第２の発明（請求項２に対応）に係る異常判定制御装置は、前記コンタクタが閉じている際は、前記高周波信号による前記電気回路の断線異常判定を禁止する。 An abnormality determination control device according to a first aspect of the present invention (corresponding to claim 1) that solves the above-described problem is composed of a high-voltage circuit including a high -voltage device and a low-voltage circuit including a low-voltage device lower than the high voltage. in the abnormality determination control apparatus for detecting the presence or absence of abnormality in the electric circuit, a Y capacitor disposed between are disposed in the high voltage circuit side and the high voltage equipment and the ground of the high voltage circuit, the low A signal generator arranged on the voltage circuit side to generate a high-frequency signal and a low-frequency signal, and to superimpose and output, a capacitor connected between the output terminal of the signal generator and the high-voltage circuit, and a high-frequency judging circuit for detecting a high-frequency signal can pass through the Y capacitor and the capacitor, the Y capacitor is and the capacitor impossible passing the low-frequency judging circuit for detecting the low frequency signal can pass, before Is disposed to the low voltage circuit side is connected to the output of the signal generator, a filter for inputting separately high and low frequencies, to each of the high-frequency judging circuit and the low-frequency determination circuit with reference to a predetermined frequency, A contactor disposed on the high-voltage circuit side and capable of supplying power to the high-voltage device, and distinguishing the high-frequency signal and the low-frequency signal according to connection / disconnection of the contactor, An electrical leakage abnormality determination of the electric circuit is performed with a signal, and a disconnection abnormality determination of the electric circuit is performed with the high-frequency signal .
The abnormality determination control device according to a second invention (corresponding to claim 2) that solves the above-described problem prohibits disconnection abnormality determination of the electric circuit by the high-frequency signal when the contactor is closed.

前記の課題を解決する第３の発明（請求項３に対応）に係る漏電検出装置において、前記高電圧機器は、高電圧バッテリと、交流モータと、前記高電圧バッテリからの直流電力を交流電力に変換して前記交流モータを駆動制御するインバータとを具備することを特徴とする。 In the leakage detection device according to a third invention for solving the above problems (corresponding to claim 3), the high voltage equipment, AC power and high voltage battery, an AC motor, the DC power from the high voltage battery And an inverter for controlling the drive of the AC motor.

請求項１に記載された発明によれば、車両の走行時又は停止時に関わらず、高周波信号及び低周波信号を発生し重畳して出力するので、切り替えることなしに高電圧回路の漏電の有無を判定することができるとともに、高電圧機器の端子と接地との間に配置され、高周波信号を通過させるＹコンデンサにより、高電圧回路内の断線も測定することができる。
請求項２に記載された発明によれば、コンタクタが閉じている際は、高周波信号による電気回路の断線異常判定を禁止するので、スイッチングノイズによる誤判定が生じない。 According to the first aspect of the invention, the high-frequency signal and the low-frequency signal are generated and superimposed and output regardless of whether the vehicle is running or stopped. In addition to being able to determine, a disconnection in the high voltage circuit can also be measured by a Y capacitor that is arranged between the terminal of the high voltage device and the ground and allows a high frequency signal to pass through.
According to the second aspect of the present invention, when the contactor is closed, the disconnection abnormality determination of the electric circuit by the high frequency signal is prohibited, so that the erroneous determination due to the switching noise does not occur.

請求項３に記載された発明によれば、高電圧機器がスイッチングノイズを発生させるインバータを含んでいる場合でも適用することが可能となる。 According to the invention described in claim 3 , it is possible to apply even when the high-voltage device includes an inverter that generates switching noise.

図１は本発明の一実施の形態に係る漏電検出装置１００が組み込まれた電動車両１０を模式的に示す説明図、図２は電動車両１０の要部を示すブロック図、図３は漏電検出装置１００における検出パターンを示す説明図である。   FIG. 1 is an explanatory view schematically showing an electric vehicle 10 in which an electric leakage detection device 100 according to an embodiment of the present invention is incorporated, FIG. 2 is a block diagram showing an essential part of the electric vehicle 10, and FIG. 4 is an explanatory diagram showing a detection pattern in the apparatus 100. FIG.

電動車両１０は、車体１１を備えている。車体１１には、車室１２と、この車室１２の下部に設けられた二次電池１３と、乗員空間１２の前部に設けられたフロント室１４とが設けられている。車体１１には駆動輪１５が設けられ、それぞれにインバータ及び駆動モータを含む高電圧機器１６が接続されている。なお、図２中１７は二次電池１３と高電圧機器１６との接続を行うコンタクタを示している。これら高電圧機器１６は、フロント室１４内の制御機器２０に接続されている。   The electric vehicle 10 includes a vehicle body 11. The vehicle body 11 is provided with a vehicle compartment 12, a secondary battery 13 provided at a lower portion of the vehicle compartment 12, and a front chamber 14 provided at a front portion of the passenger space 12. The vehicle body 11 is provided with drive wheels 15, to which high voltage devices 16 including an inverter and a drive motor are connected. In FIG. 2, reference numeral 17 denotes a contactor for connecting the secondary battery 13 and the high voltage device 16. These high voltage devices 16 are connected to a control device 20 in the front chamber 14.

図２に示すように、制御機器２０は、漏電検出装置１００を備えている。漏電検出装置１００は、低周波信号を発生する第１オシレータ（信号発生器）１０１と、高周波信号を発生する第２オシレータ（信号発生器）１０２を備えている。これら第１オシレータ１０１及び第２オシレータ１０２の出力端は接続されており、高周波信号と低周波信号とが重畳されて出力される。これら第１オシレータ１０１及び第２オシレータ１０２の出力端は、高電圧回路側に接続されたコンデンサ１０３と、フィルタ１０４の入力端とに接続されている。   As shown in FIG. 2, the control device 20 includes a leakage detection device 100. The leakage detection device 100 includes a first oscillator (signal generator) 101 that generates a low-frequency signal and a second oscillator (signal generator) 102 that generates a high-frequency signal. The output terminals of the first oscillator 101 and the second oscillator 102 are connected, and a high frequency signal and a low frequency signal are superimposed and output. The output terminals of the first oscillator 101 and the second oscillator 102 are connected to the capacitor 103 connected to the high voltage circuit side and the input terminal of the filter 104.

フィルタ１０４は、所定の周波数を基準として高周波と低周波を分けて、低周波判定回路１０５及高周波判定回路１０６に入力する。低周波判定回路１０５及び高周波判定回路１０６の出力端は、漏電検査制御部１１０とを備えている。   The filter 104 separates the high frequency and the low frequency with a predetermined frequency as a reference, and inputs the high frequency and the low frequency to the low frequency determination circuit 105 and the high frequency determination circuit 106. Output terminals of the low-frequency determination circuit 105 and the high-frequency determination circuit 106 include a leakage check control unit 110.

さらに、高電圧機器１６の両端子は、高電圧回路側に設けられたＹコンデンサ１２０を介して接地（ＧＮＤ）している。   Furthermore, both terminals of the high voltage device 16 are grounded (GND) via a Y capacitor 120 provided on the high voltage circuit side.

第１オシレータから出力される低周波信号は、コンデンサ１０３を通過可能で且つＹコンデンサ１２０を通過不可能な周波数に設定されている。また、第２オシレータから出力される高周波信号は、コンデンサ１０３及びＹコンデンサ１２０を通過可能な周波数に設定されている。   The low frequency signal output from the first oscillator is set to a frequency that can pass through the capacitor 103 and cannot pass through the Y capacitor 120. The high frequency signal output from the second oscillator is set to a frequency that can pass through the capacitor 103 and the Y capacitor 120.

このように構成された漏電検出装置１００では、次のようにして漏電の検査が行われる。すなわち、漏電検査制御部１１０で電動車両１０の走行状態或いは停止状態が検知される。なお、図３は漏電検査制御部１１０での測定パターンと判定結果をまとめたものである。   In the leakage detection device 100 configured as described above, a leakage check is performed as follows. That is, the leakage check control unit 110 detects the running state or the stopped state of the electric vehicle 10. FIG. 3 summarizes the measurement patterns and determination results in the leakage inspection control unit 110.

走行時においてはコンタクタ１７が閉じられ、二次電池１３から高電圧機器１６に電力が供給される。第１オシレータ１０１及び第２オシレータ１０２から低周波信号と高周波信号とが重畳した検査信号が出力される。   During traveling, the contactor 17 is closed, and power is supplied from the secondary battery 13 to the high voltage device 16. A test signal in which a low-frequency signal and a high-frequency signal are superimposed is output from the first oscillator 101 and the second oscillator 102.

検査信号は交流であるため、コンデンサ１０３を通過し、高電圧側に入る。高電圧側かフィルタ１０４に戻ってくる検査信号には、高電圧機器１６で発生した数ｋＨｚのスイッチングノイズが重畳されている。この検査信号をフィルタ１０４で低周波と高周波に分けて、低周波判定回路１０５及び高周波判定回路１０６に入力される。高周波判定回路１０６には、スイッチングノイズが重畳されているので、判定は行われない。   Since the inspection signal is alternating current, it passes through the capacitor 103 and enters the high voltage side. A switching noise of several kHz generated by the high voltage device 16 is superimposed on the inspection signal returning to the high voltage side or the filter 104. The inspection signal is divided into a low frequency and a high frequency by the filter 104 and input to the low frequency determination circuit 105 and the high frequency determination circuit 106. Since switching noise is superimposed on the high frequency determination circuit 106, the determination is not performed.

一方、低周波判定回路１０５において第１オシレータ１０１が出力した低周波信号とほぼ一致した信号が検知されれば、漏電は生じていない。これに対し、低周波信号が検知されなければ、出力した低周波信号と異なっていたり、大幅にレベルが低い場合には漏電が生じていると判定する。この検知の有無が漏電検査制御部１１０へ出力され、「正常」又は「異常」が判定される（図３参照）。   On the other hand, if the low frequency determination circuit 105 detects a signal that substantially matches the low frequency signal output from the first oscillator 101, no leakage has occurred. On the other hand, if a low frequency signal is not detected, it is determined that a leakage has occurred if it is different from the output low frequency signal or if the level is significantly low. The presence / absence of this detection is output to leakage check control unit 110, and “normal” or “abnormal” is determined (see FIG. 3).

停止時においてはコンタクタ１７が開かれ、二次電池１３と高電圧機器１６との接続は解除される。この状態で、第１オシレータ１０１及び第２オシレータ１０２から低周波信号と高周波信号とが重畳した検査信号が出力される。なお、高電圧側での断線（例えば、図２中Ｐ点）も同時に検出できる。   At the time of stop, the contactor 17 is opened, and the connection between the secondary battery 13 and the high voltage device 16 is released. In this state, a test signal in which a low frequency signal and a high frequency signal are superimposed is output from the first oscillator 101 and the second oscillator 102. A disconnection on the high voltage side (for example, point P in FIG. 2) can also be detected simultaneously.

走行時と同様に、第１オシレータ１０１及び第２オシレータ１０２から低周波信号と高周波信号とが重畳した検査信号が出力される。   As in the case of traveling, an inspection signal in which a low-frequency signal and a high-frequency signal are superimposed is output from the first oscillator 101 and the second oscillator 102.

検査信号は交流であるため、コンデンサ１０３を通過し、高電圧側に入る。高電圧側かフィルタ１０４に戻ってくる検査信号をフィルタ１０４で低周波と高周波に分けて、低周波判定回路１０５及び高周波判定回路１０６に入力される。なお、高電圧機器１６は停止しているため、フィルタ１０４に入力される検査信号にスイッチングノイズは重畳されていない。   Since the inspection signal is alternating current, it passes through the capacitor 103 and enters the high voltage side. The inspection signal returning to the high voltage side or the filter 104 is divided into a low frequency and a high frequency by the filter 104 and input to the low frequency determination circuit 105 and the high frequency determination circuit 106. Note that, since the high-voltage device 16 is stopped, switching noise is not superimposed on the inspection signal input to the filter 104.

低周波判定回路１０５において第１オシレータ１０１が出力した低周波信号とほぼ一致した信号が検知されれば、漏電は生じていない。一方、高周波判定回路１０６において第２オシレータ１０２が出力した高周波信号とほぼ一致した信号が検知されれば、断線が生じていると判定され、高周波信号とほぼ一致した信号が検知されなければ、断線は無いと判定される。   If a signal that substantially matches the low-frequency signal output from the first oscillator 101 is detected in the low-frequency determination circuit 105, no leakage has occurred. On the other hand, if a signal that substantially matches the high-frequency signal output from the second oscillator 102 is detected in the high-frequency determination circuit 106, it is determined that a disconnection has occurred, and if a signal that substantially matches the high-frequency signal is not detected, the disconnection occurs. It is determined that there is no.

これは、次のような理由による。すなわち、高電圧側ではＹコンデンサ１２０を介して接続されている。Ｙコンデンサ１２０は第２オシレータ１０２が出力した高周波信号が通過できる容量に設定されているので、高電圧側で断線が無ければ高周波信号はＹコンデンサ１２０を介して接地し、高周波判定回路１０６に戻らない。これに対し、断線が有れば、そもそもＹコンデンサ１２０に高周波信号が達しないので、高周波判定回路１０６に高周波信号が戻ることになるためである。なお、低周波信号はＹコンデンサ１２０を通過できないので、断線の判定はできない。   This is due to the following reason. That is, the high voltage side is connected via the Y capacitor 120. Since the Y capacitor 120 is set to have a capacity through which the high frequency signal output from the second oscillator 102 can pass, if there is no disconnection on the high voltage side, the high frequency signal is grounded via the Y capacitor 120 and returned to the high frequency determination circuit 106. Absent. On the other hand, if there is a disconnection, the high frequency signal does not reach the Y capacitor 120 in the first place, and thus the high frequency signal returns to the high frequency determination circuit 106. In addition, since the low frequency signal cannot pass through the Y capacitor 120, the disconnection cannot be determined.

低周波判定回路１０５において第１オシレータ１０１が出力した低周波信号と一致した信号が検知されなければ漏電が生じていると判定される。一方、高周波判定回路１０６において第２オシレータ１０２が出力した高周波信号とほぼ一致した信号が検知されれば、断線が生じていると判定され、高周波信号とほぼ一致した信号が検知されなければ、断線は無いと判定される。   If the low frequency determination circuit 105 does not detect a signal that matches the low frequency signal output from the first oscillator 101, it is determined that a leakage has occurred. On the other hand, if a signal that substantially matches the high-frequency signal output from the second oscillator 102 is detected in the high-frequency determination circuit 106, it is determined that a disconnection has occurred, and if a signal that substantially matches the high-frequency signal is not detected, the disconnection occurs. It is determined that there is no.

このようにして低周波及び高周波の検知の有無が漏電検査制御部１１０へ出力され、「正常」又は「異常」が判定される（図３参照）。   In this way, the presence / absence of detection of the low frequency and the high frequency is output to the leakage inspection control unit 110, and “normal” or “abnormal” is determined (see FIG. 3).

上述したように、本実施の形態に係る漏電検出装置１００によれば、走行状態又は停止状態に関わらず、低周波信号及び高周波信号を重畳した検査信号を高電圧側に送ることで、切替を行うことなく漏電の有無を判定することができる。また、停止状態であれば、断線の有無も同時に測定することができる。さらに、高電圧側は直流であるためコンデンサ１０３を通過できず、低電圧側に高電圧がかかることがなく、安全性が高いとともにコストの面でも有利となる。   As described above, according to the leakage detection device 100 according to the present embodiment, the switching is performed by sending the inspection signal on which the low-frequency signal and the high-frequency signal are superimposed to the high voltage side regardless of the running state or the stopped state. It is possible to determine the presence or absence of electric leakage without performing it. Moreover, if it is a stop state, the presence or absence of a disconnection can also be measured simultaneously. Furthermore, since the high voltage side is direct current, it cannot pass through the capacitor 103, and no high voltage is applied to the low voltage side, which is highly safe and advantageous in terms of cost.

なお、本発明は上記実施の形態に限定されるものではない。例えば、漏電検出装置１００は制御装置２０内にあるように説明しているが、漏電検出装置１００は電池パック内に設けるようにしてもよい。したがって、高電圧側と低電圧側との電気的な区切りが設けられていれば、漏電検出装置１００の配設場所は限定されるものではない。この他、本発明の要旨を逸脱しない範囲で種々変形実施可能である。   The present invention is not limited to the above embodiment. For example, although the leakage detection device 100 is described as being in the control device 20, the leakage detection device 100 may be provided in the battery pack. Therefore, as long as an electrical separation between the high voltage side and the low voltage side is provided, the location of the leakage detection device 100 is not limited. In addition, various modifications can be made without departing from the scope of the present invention.

本発明の一実施の形態に係る漏電検出装置が組み込まれた電動車両を模式的に示す説明図。BRIEF DESCRIPTION OF THE DRAWINGS Explanatory drawing which shows typically the electric vehicle incorporating the earth-leakage detection apparatus which concerns on one embodiment of this invention. 同電動車両の要部を示すブロック図。The block diagram which shows the principal part of the same electric vehicle. 同漏電検出装置おける検出パターンを示す説明図。Explanatory drawing which shows the detection pattern in the same leak detection apparatus.

符号の説明Explanation of symbols

１０…電動車両、１３…二次電池、１６…高電圧機器、２０…制御機器、１００…漏電検出装置、１０１…第１オシレータ（信号発生器）、１０２…第２オシレータ（信号発生器）、１０３…コンデンサ、１０４…フィルタ、１０５…低周波判定回路、１０６…高周波判定回路、１２０…Ｙコンデンサ。   DESCRIPTION OF SYMBOLS 10 ... Electric vehicle, 13 ... Secondary battery, 16 ... High voltage apparatus, 20 ... Control apparatus, 100 ... Leakage detection apparatus, 101 ... 1st oscillator (signal generator), 102 ... 2nd oscillator (signal generator), DESCRIPTION OF SYMBOLS 103 ... Capacitor 104 ... Filter 105 ... Low frequency determination circuit 106 ... High frequency determination circuit 120 ... Y capacitor

Claims (3)

高電圧機器を含む高電圧回路及び前記高電圧より低い低電圧機器を含む低電圧回路で構成された電気回路における異常の有無を検出する異常判定制御装置において、
前記高電圧回路側に配置されて前記高電圧機器と前記高電圧回路の接地との間に配設されるＹコンデンサと、
前記低電圧回路側に配置されて高周波信号及び低周波信号を発生し、重畳して出力する信号発生器と、
前記信号発生器の出力端と前記高電圧回路との間に接続されたコンデンサと、
前記Ｙコンデンサ及び前記コンデンサを通過可能な高周波信号を検知する高周波判定回路と、
前記Ｙコンデンサは通過不可能で且つ前記コンデンサは通過可能な低周波信号を検知する低周波判定回路と、
前記低電圧回路側に配置されて前記信号発生器の出力端に接続され、所定の周波数を基準として高周波と低周波を分けて、それぞれ前記高周波判定回路及び前記低周波判定回路に入力するフィルタと、
前記高電圧回路側に配置されて前記高電圧機器への電力供給を可能とするコンタクタとを備え、
前記コンタクタの断接に応じて前記高周波信号と前記低周波信号とを判別し、
前記低周波信号で前記電気回路の漏電異常判定を実施し、前記高周波信号で前記電気回路の断線異常判定を実施する
ことを特徴とする異常判定制御装置。 In an abnormality determination control device for detecting the presence or absence of abnormality in an electric circuit composed of a high voltage circuit including a high voltage device and a low voltage circuit including a low voltage device lower than the high voltage ,
A Y capacitor disposed on the high voltage circuit side and disposed between the high voltage device and the ground of the high voltage circuit;
A signal generator arranged on the low-voltage circuit side to generate a high-frequency signal and a low-frequency signal, and to superimpose and output,
A capacitor connected between the output of the signal generator and the high voltage circuit;
A high-frequency determination circuit that detects the Y capacitor and a high-frequency signal that can pass through the capacitor;
A low-frequency determination circuit that detects a low-frequency signal through which the Y capacitor cannot pass and the capacitor can pass;
A filter disposed on the low voltage circuit side and connected to the output end of the signal generator, separating a high frequency and a low frequency on the basis of a predetermined frequency and respectively inputting the high frequency determination circuit and the low frequency determination circuit; ,
A contactor disposed on the high voltage circuit side to enable power supply to the high voltage device ;
The high frequency signal and the low frequency signal are determined according to the connection / disconnection of the contactor,
An abnormality determination control device that performs a leakage abnormality determination of the electric circuit with the low-frequency signal and performs a disconnection abnormality determination of the electric circuit with the high-frequency signal . 前記コンタクタが閉じている際は、前記高周波信号による前記電気回路の断線異常判定を禁止するWhen the contactor is closed, the disconnection abnormality judgment of the electric circuit by the high frequency signal is prohibited.
ことを特徴とする請求項１に記載の異常判定制御装置。The abnormality determination control apparatus according to claim 1. 前記高電圧機器は、高電圧バッテリと、交流モータと、前記高電圧バッテリからの直流電力を交流電力に変換して前記交流モータを駆動制御するインバータとを具備することを特徴とする請求項１または２に記載の異常判定制御装置。 The high-voltage device includes a high-voltage battery, an AC motor, and an inverter that converts the DC power from the high-voltage battery into AC power and controls the AC motor. Or the abnormality determination control apparatus of 2.
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