JPH10221395A - System for detecting ground fault of electric vehicle - Google Patents
System for detecting ground fault of electric vehicleInfo
- Publication number
- JPH10221395A JPH10221395A JP9025000A JP2500097A JPH10221395A JP H10221395 A JPH10221395 A JP H10221395A JP 9025000 A JP9025000 A JP 9025000A JP 2500097 A JP2500097 A JP 2500097A JP H10221395 A JPH10221395 A JP H10221395A
- Authority
- JP
- Japan
- Prior art keywords
- ground fault
- trial
- electric vehicle
- output
- ground
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Measurement Of Current Or Voltage (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【発明の属する技術分野】本発明は、電気自動車の地絡
検知システムに関する。The present invention relates to a ground fault detection system for an electric vehicle.
【０００２】[0002]
【従来の技術】従来技術として、図３に示す様に、一定
周期の矩形波１０１を出力する発振回路１００と、矩形
波１０１が入力されるバッファ１０２と、該バッファ１
０２の出力１０３（矩形波）を(+) 母線１０４に印加す
るための、抵抗１０５及びカップリングコンデンサ１０
６と、抵抗１０５とカップリングコンデンサ１０６の接
続点１０７の矩形波１０８が反転入力端子１０９に入力
され、その矩形波の波高値より低く設定（非地絡時）さ
れた基準電圧１１０が非反転入力端子１１１に入力され
る第１比較器１１２と、非反転入力端子１１３に基準電
圧１１４が入力され、平滑用抵抗１１５と平滑用コンデ
ンサ１１６の接続点１１７の電圧１１８が反転入力端子
１１９に入力される第２比較器１２０とを有する電気自
動車の地絡検知システムＢが知られている（特開平８-
７０５０３号公報）。2. Description of the Related Art As a conventional technique, as shown in FIG. 3, an oscillation circuit 100 for outputting a rectangular wave 101 having a constant period, a buffer 102 to which a rectangular wave 101 is input, and a buffer 1
02 and a coupling capacitor 10 for applying the output 103 (rectangular wave) of 02 to the (+) bus 104
6, a rectangular wave 108 at a connection point 107 between the resistor 105 and the coupling capacitor 106 is input to the inverting input terminal 109, and the reference voltage 110 set lower than the peak value of the rectangular wave (at the time of non-grounding) is non-inverted. A reference voltage 114 is input to a first comparator 112 input to an input terminal 111 and a non-inverting input terminal 113, and a voltage 118 at a connection point 117 between a smoothing resistor 115 and a smoothing capacitor 116 is input to an inverting input terminal 119. A ground fault detection system B for an electric vehicle having a second comparator 120 is known (Japanese Patent Application Laid-Open No. H08-08258).
No. 70503).
【０００３】例えば、 (-)母線１２１が車体に地絡（地
絡抵抗１２３）すると、車載バッテリ１２２→カップリ
ングコンデンサ１０６→抵抗１０５→バッファ１０２→
車体→地絡抵抗１２３→車載バッテリ１２２の経路で、
カップリングコンデンサ１０６は、略車載バッテリ１２
２の端子電圧まで充電される。For example, when the (-) bus 121 is grounded to the vehicle body (ground fault resistance 123), the vehicle battery 122 → coupling capacitor 106 → resistance 105 → buffer 102 →
On the route of the vehicle body → ground fault resistance 123 → vehicle battery 122,
The coupling capacitor 106 is connected to the vehicle-mounted battery 12.
2 terminal voltage.
【０００４】又、出力１０３（矩形波）は、バッファ１
０２→抵抗１０５→カップリングコンデンサ１０６→車
載バッテリ１２２→地絡抵抗１２３→車体→バッファ１
０２の経路で伝達し、カップリングコンデンサ１０６の
充電完了とともに、出力１０３（矩形波）が抵抗１０５
と地絡抵抗１２３とにより分圧される。この為、反転入
力端子１０９に入力される矩形波１０８の波高値は基準
電圧１１０より低いので、第１比較器１１２の出力はＨ
ｉ状態となる。The output 103 (rectangular wave) is supplied to the buffer 1
02 → resistance 105 → coupling capacitor 106 → vehicle battery 122 → ground fault resistance 123 → vehicle → buffer 1
02, the output 103 (rectangular wave) is output to the resistor 105 upon completion of charging of the coupling capacitor 106.
And the ground fault resistor 123. For this reason, since the peak value of the rectangular wave 108 input to the inverting input terminal 109 is lower than the reference voltage 110, the output of the first comparator 112 is H
It becomes i state.
【０００５】この結果、接続点１１７の電圧１１８＞基
準電圧１１４となるので第２比較器１２０の出力はＨｉ
状態となる。そして、この第２比較器１２０の出力が駆
動用トランジスタ（図示せず）をオン状態にするので地
絡報知ランプが点灯する。As a result, the voltage 118 at the connection point 117> the reference voltage 114, so that the output of the second comparator 120 is Hi.
State. Then, the output of the second comparator 120 turns on the driving transistor (not shown), so that the ground fault notification lamp is turned on.
【０００６】[0006]
【発明が解決しようとする課題】しかるに、上記地絡検
知システムＢは、自己診断機能を持たないので以下に示
す故障が生じると地絡が報知されないという課題を有す
る。 第２比較器１２０の後段に接続される駆動用トランジス
のショート故障 第２比較器１２０の故障 第２比較器１２０と駆動用トランジスとを接続する接続
線の断線However, since the ground fault detection system B does not have a self-diagnosis function, there is a problem that a ground fault will not be notified if a failure described below occurs. Short circuit failure of the driving transistor connected to the second stage of the second comparator 120. Failure of the second comparator 120. Disconnection of the connection line connecting the second comparator 120 and the driving transistor.
【０００７】本発明の目的は、システム自体が正常に作
動しているか否かを自己診断できる、電気自動車の地絡
検知システムの提供にある。[0007] It is an object of the present invention to provide a ground fault detection system for an electric vehicle that can self-diagnose whether the system itself is operating normally.
【０００８】[0008]
〔請求項１の作用効果について〕地絡試行時にはスイッ
チ素子がオン状態にされ、何れかのバッテリ母線と車体
とが抵抗を介して地絡（試行地絡）する。地絡検知手段
は地絡（試行地絡）が起きたことを検知する。又、地絡
検知手段が故障していると、地絡検知手段は地絡（試行
地絡）を検知できない。地絡試行時に地絡検知手段が地
絡（試行地絡）を検知した場合には、報知器制御手段は
報知器を作動させない。又、地絡検知手段が故障してい
ると、地絡試行時に地絡検知手段が地絡（試行地絡）を
検知しないので報知器制御手段は報知器を作動させる。[Action and Effect of Claim 1] At the time of a ground fault trial, the switch element is turned on, and any battery bus and the vehicle body are grounded (trial ground fault) via a resistor. The ground fault detecting means detects that a ground fault (trial ground fault) has occurred. If the ground fault detecting means is out of order, the ground fault detecting means cannot detect a ground fault (trial ground fault). If the ground fault detecting means detects a ground fault (trial ground fault) at the time of the ground fault trial, the alarm control means does not operate the alarm. Also, if the ground fault detecting means is out of order, the ground fault detecting means does not detect a ground fault (trial ground fault) at the time of the ground fault trial, so the alarm control means activates the alarm.
【０００９】通常監視時にはスイッチ素子がオフ状態に
される。地絡が起きていない場合には地絡検知手段が地
絡を検知せず、地絡が起きている場合には地絡検知手段
が地絡を検知する。地絡を検知しない（地絡が起きてい
ない）場合には報知器制御手段が報知器を作動させず、
地絡を検知した（地絡が起きている）場合には報知器制
御手段が報知器を作動させる。地絡検知システムは、地
絡試行時に試行地絡を行って、地絡検知手段が試行地絡
を検知できるかどうかを自己診断する構成であるので地
絡検知手段の動作が確認でき信頼性に優れる。During normal monitoring, the switch element is turned off. When no ground fault has occurred, the ground fault detecting means does not detect the ground fault, and when a ground fault has occurred, the ground fault detecting means detects the ground fault. If no ground fault is detected (no ground fault has occurred), the alarm control means will not activate the alarm,
If a ground fault is detected (a ground fault has occurred), the alarm control means activates the alarm. The ground fault detection system performs a test ground fault at the time of a ground fault trial and performs self-diagnosis as to whether the ground fault detection means can detect the trial ground fault. Excellent.
【００１０】（請求項２の作用効果について）矩形波発
生手段が矩形波を出力し、この矩形波は検出用抵抗及び
カップリングコンデンサを介して何れかのバッテリ母線
に印加される。地絡試行時にはスイッチ素子がオン状態
にされ、何れかのバッテリ母線と車体とが抵抗を介して
地絡（試行地絡）する。上記試行地絡により判別手段の
出力状態が変化するので、地絡検知手段は地絡（試行地
絡）が起きたと判別する。又、地絡検知手段の何処かが
故障していると、判別手段の出力状態が変化しないので
地絡検知手段は地絡（試行地絡）を検知しない。[0010] The rectangular wave generating means outputs a rectangular wave, and this rectangular wave is applied to any of the battery buses via a detecting resistor and a coupling capacitor. At the time of a ground fault trial, the switch element is turned on, and one of the battery buses and the vehicle body is grounded (trial ground fault) via a resistor. Since the output state of the determining means changes due to the trial ground fault, the ground fault detecting means determines that a ground fault (trial ground fault) has occurred. Further, if any part of the ground fault detecting means is out of order, the output state of the determining means does not change, so that the ground fault detecting means does not detect a ground fault (trial ground fault).
【００１１】地絡試行時に地絡検知手段が地絡（試行地
絡）を検知した場合には報知器制御手段は報知器を作動
させない。又、地絡検知手段が故障しており、地絡試行
時に地絡検知手段が地絡（試行地絡）を検知できない場
合には報知器制御手段が報知器を作動させる。地絡検知
システムは、地絡試行時に試行地絡を行って、地絡検知
手段が試行地絡を検知できるかどうかを自己診断する構
成であるので地絡検知手段の動作が確認でき信頼性に優
れる。If the ground fault detecting means detects a ground fault (trial ground fault) at the time of the ground fault trial, the alarm control means does not operate the alarm. If the ground fault detecting means has failed and the ground fault detecting means cannot detect a ground fault (trial ground fault) at the time of the ground fault trial, the alarm control means activates the alarm. The ground fault detection system performs a test ground fault at the time of a ground fault trial and performs self-diagnosis as to whether the ground fault detection means can detect the trial ground fault. Excellent.
【００１２】（請求項３の作用効果について）比較器に
入力する基準電圧は、地絡が起きていない状態におい
て、検出用抵抗とカプリングコンデンサとの接続点に現
れる矩形波の波高値より低く設定されている。地絡（試
行地絡も含む）が起きると、上記接続点に現れる矩形波
の波高値は非地絡時の波高値より低くなり、比較器の出
力はパルスからＨｉレベルに切り替わる。The reference voltage input to the comparator is set lower than the peak value of the rectangular wave that appears at the connection point between the detection resistor and the coupling capacitor when no ground fault occurs. Have been. When a ground fault (including a trial ground fault) occurs, the peak value of the rectangular wave appearing at the connection point becomes lower than the peak value at the time of the non-ground fault, and the output of the comparator switches from the pulse to the Hi level.
【００１３】監視手段は、比較器の出力状態（パルス／
Ｈｉレベル）に基づいて地絡試行時の地絡や通常監視時
の地絡を監視し、地絡試行時に地絡（試行地絡）を検知
した場合（比較器の出力がパルス→Ｈｉレベルに変化）
や、通常監視時に地絡を検知しない場合（比較器の出力
がパルスを維持）にパルス出力を送出する。The monitoring means outputs the output state (pulse / pulse) of the comparator.
The ground fault at the time of the ground fault trial and the ground fault at the time of normal monitoring are monitored based on the Hi level), and when the ground fault (trial ground fault) is detected at the time of the ground fault trial (the output of the comparator changes from the pulse to the Hi level) change)
Alternatively, a pulse output is sent out when a ground fault is not detected during normal monitoring (the output of the comparator keeps a pulse).
【００１４】地絡試行時や通常監視時に監視手段がパル
ス出力以外を送出すると、報知器制御手段は、システム
が故障しているか地絡が発生したと見なし、報知器を作
動させる。地絡検知システムは、地絡試行時に試行地絡
を行って、監視手段が地絡（試行地絡）を検知できるか
どうかを自己診断する構成である。更に、通常監視時に
も監視手段が送出するパルス出力に基づき、報知器駆動
手段がシステムの作動を常時、チェックする構成であ
る。この為、地絡検知システムは信頼性に優れる。If the monitoring means sends a signal other than a pulse output during a ground fault trial or during normal monitoring, the alarm control means determines that the system has failed or a ground fault has occurred, and activates the alarm. The ground fault detection system is configured to perform a test ground fault at the time of a ground fault trial, and to perform a self-diagnosis as to whether or not the monitoring means can detect a ground fault (trial ground fault). Further, the alarm drive means always checks the operation of the system based on the pulse output sent by the monitoring means even during normal monitoring. Therefore, the ground fault detection system is excellent in reliability.
【００１５】（請求項４の作用効果について）監視手段
と報知器駆動手段との接続を容易にする為に半導体スイ
ッチ素子を介して報知器駆動手段を監視手段に接続して
いる。半導体スイッチ素子が故障（オープン又はショー
ト）すると、監視手段が送出するパルス出力が報知器駆
動手段に伝達されない。この場合、報知器駆動手段には
パルス出力以外が入力されるので報知器が作動する。地
絡検知システムは、半導体スイッチ素子が正常であるか
否かも自己診断できるので信頼性に優れる。In order to facilitate the connection between the monitoring means and the alarm driving means, the alarm driving means is connected to the monitoring means via a semiconductor switch element. If the semiconductor switch element fails (opens or shorts), the pulse output sent by the monitoring means is not transmitted to the alarm drive means. In this case, an alarm other than a pulse output is input to the alarm driving means, so that the alarm operates. The ground fault detection system is excellent in reliability because it can self-diagnose whether the semiconductor switch element is normal or not.
【００１６】（請求項５の作用効果について）電気自動
車の地絡検知システムは、電気自動車の運転者が、キー
スイッチをオフ状態からオン状態に切り替えた際にシス
テムを自己診断する構成である。この為、運転開始の際
に毎回、自己診断が成されるので信頼性に優れるととも
に、自己診断を行うスイッチを別途、設ける必要が無
い。(Effect of Claim 5) The ground fault detection system for an electric vehicle has a configuration in which a self-diagnosis of the system is performed when a driver of the electric vehicle switches a key switch from an off state to an on state. Therefore, the self-diagnosis is performed every time the operation is started, so that the reliability is excellent, and there is no need to separately provide a switch for performing the self-diagnosis.
【００１７】[0017]
【発明の実施の形態】本発明の一実施例（請求項１〜５
に対応）を、図１及び図２に基づいて説明する。図１に
示す様に、電気自動車の地絡検知システムＡは、リレー
１１と抵抗１２とからなり車体１０と母線６１との間に
接続される地絡試行回路１と、バッファ４０が出力する
矩形波４１１を母線６１に印加する、検出用抵抗２及び
カップリングコンデンサ３と、接続点ｐの信号（矩形
波）４１２を反転入力端子４１に入力し、基準電圧Ｖｒ
を非反転入力端子４２に入力する比較器４と、発振部５
０を有する制御器５と、トランジスタ５１と、ＬＥＤ制
御器５２と、ＬＥＤ５３とを備え、車載バッテリ６と、
走行用の交流モータ７と、入力側を母線６１、６２に電
気接続し、出力側を交流給電線８１、８２、８３を介し
て交流モータ７に電気接続したＤＣ・ＡＣインバータ８
とを有する電気自動車に組み付けられる。尚、地絡検知
器９が地絡検知手段（請求項１）、ＬＥＤ制御器５２が
報知器制御手段（請求項１）や報知器駆動手段（請求項
３）、制御器５が監視手段（請求項３）、及びトランジ
スタ５１が半導体スイッチ素子（請求項４）に相当す
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention (Claims 1 to 5)
Will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, a ground fault detection system A for an electric vehicle includes a ground fault trial circuit 1 including a relay 11 and a resistor 12 and connected between the vehicle body 10 and a bus 61, and a rectangle output from the buffer 40. The wave 411 is applied to the bus 61, the detection resistor 2 and the coupling capacitor 3, and the signal (rectangular wave) 412 at the connection point p are input to the inverting input terminal 41, and the reference voltage Vr
4 to the non-inverting input terminal 42, and the oscillator 5
0, a controller 51, a transistor 51, an LED controller 52, and an LED 53.
An AC motor 7 for traveling and a DC / AC inverter 8 whose input side is electrically connected to the buses 61 and 62 and whose output side is electrically connected to the AC motor 7 via AC power supply lines 81, 82 and 83.
And an electric vehicle having: The ground fault detector 9 is a ground fault detecting means (Claim 1), the LED controller 52 is an alarm control means (Claim 1) and an alarm driving means (Claim 3), and the controller 5 is a monitoring means (Claim 3). Claim 3) and the transistor 51 correspond to a semiconductor switching element (claim 4).
【００１８】地絡試行回路１は、地絡を模擬的に実施す
るための回路である。運転者がキースイッチをＯＦＦか
らＯＮに切り替える（地絡試行時）と、制御器５から所
定時間、励磁用電力５０２が通電されリレー１１の接点
が略所定時間のあいだオン状態となり、母線６１と車体
１０とが抵抗１２を介して接続（模擬地絡）される。The ground fault trial circuit 1 is a circuit for simulating a ground fault. When the driver switches the key switch from OFF to ON (at the time of a ground fault trial), the exciting power 502 is supplied from the controller 5 for a predetermined time, and the contact of the relay 11 is turned on for a substantially predetermined time. The vehicle body 10 is connected (simulated ground fault) via the resistor 12.
【００１９】バッファ４１は、制御器５の発振部５０が
出力する矩形波５０１を緩衝増幅する。比較器４の基準
電圧Ｖｒは、非地絡時において接続点ｐの矩形波４１２
の波高値よりもレベルが低くなる様に抵抗４３、４４に
より設定されている。このため、地絡が起きていない場
合には比較器４はパルス出力を送出し、地絡（模擬地絡
も含む）が発生した場合には比較器４はＨｉ出力を送出
する。The buffer 41 buffers and amplifies the rectangular wave 501 output from the oscillation unit 50 of the controller 5. The reference voltage Vr of the comparator 4 is equal to the square wave 412 of the connection point p when there is no ground fault.
Are set by the resistances 43 and 44 so that the level becomes lower than the peak value of. Therefore, when no ground fault has occurred, the comparator 4 outputs a pulse output, and when a ground fault (including a simulated ground fault) occurs, the comparator 4 transmits a Hi output.
【００２０】制御器５は、比較器４の出力が入力され、
以下に示す自己診断正常時や地絡非検知時（通常監視
時）にはパルス出力をトランジスタ５１に送出する。 〔自己診断正常時〕比較器４の出力は、パルスからＨｉ
に変化 〔地絡非検知時（通常監視時）〕比較器４の出力は、パ
ルスを継続The controller 5 receives the output of the comparator 4 and
A pulse output is sent to the transistor 51 when the following self-diagnosis is normal or when no ground fault is detected (during normal monitoring). [When the self-diagnosis is normal] The output of the comparator 4 is Hi from the pulse.
[When no ground fault is detected (during normal monitoring)] The output of the comparator 4 continues to pulse.
【００２１】トランジスタ５１は、ベースへの信号入力
により以下の様に状態が変化する（正常時）。 制御器５がパルス出力を送出……オン- オフの繰り返し 制御器５がＬｏ出力を送出………オフ状態 制御器５がＨｉ出力を送出………オン状態The state of the transistor 51 changes according to the signal input to the base as follows (in a normal state). Controller 5 sends a pulse output ........ Repeats on-off. Controller 5 sends Lo output ..... Off state. Controller 5 sends Hi output ..... On state.
【００２２】ＬＥＤ制御器５２は、トランジスタ５１の
状態により以下に示す様にＬＥＤ５３の点灯状態を制御
する。 Ｔｒ５１がオン- オフの繰り返し……消灯 Ｔｒ５１がオン状態……………………点灯 Ｔｒ５１がオフ状態……………………点灯The LED controller 52 controls the lighting state of the LED 53 according to the state of the transistor 51 as described below. Tr51 is repeatedly turned on and off ....... Lights off. Tr51 is on .............. Lights up. Tr51 is off .............. Lights up.
【００２３】つぎに、電気自動車の地絡検知システムＡ
の自己診断動作を、表１及び図２のフローチャートに基
づいて説明する。キースイッチ（図示せず）を運転者が
ＯＮにする（ステップｓ１でＹＥＳ）と、安定化電圧＋
Ｖｃｃの地絡検知システムＡへの印加が開始され、発振
部５０が矩形波５０１をバッファ４１へ出力する（ステ
ップｓ２）。接続点ｐの矩形波４１２の波高値よりも基
準電圧Ｖｒの方がレベルが低いので、比較器４はパルス
出力を送出する。Next, a ground fault detection system A for an electric vehicle
Will be described based on Table 1 and the flowchart of FIG. When the driver turns on a key switch (not shown) (YES in step s1), the stabilization voltage +
The application of Vcc to the ground fault detection system A is started, and the oscillation unit 50 outputs a rectangular wave 501 to the buffer 41 (step s2). Since the level of the reference voltage Vr is lower than the peak value of the rectangular wave 412 at the connection point p, the comparator 4 sends out a pulse output.
【００２４】制御器５は、一定時間（例えば１５秒
間）、励磁用電力５０２をリレー１１に通電する（ステ
ップｓ３）。リレー１１は略一定時間のあいだ接点がオ
ン状態となり、母線６１と車体１０とが抵抗１２を介し
て接続（地絡）される。The controller 5 supplies the exciting power 502 to the relay 11 for a predetermined time (for example, 15 seconds) (step s3). The relay 11 has its contact turned on for a substantially constant time, and the bus 61 and the vehicle body 10 are connected (ground fault) via the resistor 12.
【００２５】地絡検知システムＡが正常に作動している
場合、比較器４の基準電圧Ｖｒが接続点ｐの矩形波４１
２の波高値よりもレベルが高くなるので比較器４の出力
は、パルス出力からＨｉ出力に切り替わる（表１の“正
常”）。When the ground fault detection system A is operating normally, the reference voltage Vr of the comparator 4
Since the level becomes higher than the peak value of No. 2, the output of the comparator 4 switches from the pulse output to the Hi output ("normal" in Table 1).
【００２６】[0026]
【表１】 [Table 1]
【００２７】比較器４の出力がパルス出力からＨｉ出力
に切り替わると、制御器５はパルス出力をトランジスタ
５１に送出する（表１の“正常”）。トランジスタ５１
にはパルス出力が入力され、トランジスタ５１は、オン
／オフを繰り返す（ステップｓ４で“オン／オフ”）。
この場合、ＬＥＤ制御器５２は、ＬＥＤ５３を消灯状態
に維持する（ステップｓ５）。When the output of the comparator 4 switches from the pulse output to the Hi output, the controller 5 sends the pulse output to the transistor 51 ("normal" in Table 1). Transistor 51
, A pulse output is input, and the transistor 51 repeats on / off (“on / off” in step s4).
In this case, the LED controller 52 keeps the LED 53 in the off state (step s5).
【００２８】例えば、トランジスタ５１がショートして
いる場合（表１の“Ｔｒ５１ショート”）には、模擬地
絡時にトランジスタ５１の状態が変化しないので、ＬＥ
Ｄ制御器５２はＬＥＤ５３を点灯状態にする（ステップ
ｓ６）。For example, when the transistor 51 is short-circuited ("Tr51 short-circuit" in Table 1), the state of the transistor 51 does not change at the time of the simulated ground fault.
The D controller 52 turns on the LED 53 (step s6).
【００２９】又、トランジスタ５１がオープン故障（表
１の“Ｔｒ５１オープン”）している場合には、模擬地
絡時にトランジスタ５１の状態が変化しないので、ＬＥ
Ｄ制御器５２はＬＥＤ５３を点灯状態にする（ステップ
ｓ７）。When the transistor 51 has an open failure ("Tr51 open" in Table 1), the state of the transistor 51 does not change at the time of the simulated ground fault, so that LE
The D controller 52 turns on the LED 53 (step s7).
【００３０】つぎに、本実施例の利点を述べる。 〔ア〕キースイッチをＯＮ側にした際にＬＥＤ５３の点
灯状態を見れば、地絡検知システムＡが正常に作動して
いるか否かを自己診断することができる。この為、地絡
検知システムＡは信頼性に優れる。具体的には、以下の
故障状態の場合、模擬地絡時にＬＥＤ５３が点灯する。 トランジスタ５１がショート トランジスタ５１がオープン故障 出力ラインがオープン 模擬地絡検知が不能の場合Next, advantages of this embodiment will be described. [A] By checking the lighting state of the LED 53 when the key switch is turned ON, it is possible to self-diagnose whether or not the ground fault detection system A is operating normally. Therefore, the ground fault detection system A is excellent in reliability. Specifically, in the case of the following failure states, the LED 53 is turned on during a simulated ground fault. Transistor 51 shorted Transistor 51 open failure Output line open Simulated ground fault detection disabled
【００３１】〔イ〕通常監視時（模擬地絡動作の終了
後）において、例えば地絡（抵抗Ｒ）が発生すると比較
器４の出力がパルス出力からＨｉ出力に切り替わり、制
御器５がパルス出力をトランジスタ５１に送出し、ＬＥ
Ｄ制御器５２がＬＥＤ５３を点灯させる構成であるので
確実に地絡を検出することができる。[A] During normal monitoring (after completion of the simulated ground fault operation), for example, when a ground fault (resistance R) occurs, the output of the comparator 4 switches from pulse output to Hi output, and the controller 5 outputs pulse output. To the transistor 51 and LE
Since the D controller 52 is configured to turn on the LED 53, a ground fault can be reliably detected.
【００３２】本発明は、上記実施例以外につぎの実施態
様を含む。 ａ．上記実施例は、キースイッチをＯＦＦ側からＯＮ側
にした際に自己診断動作を行う構成であるが、自己診断
動作を行うタイミングを以下の様に設定しても良い。 一定時間毎、所定距離走行毎 自己診断スイッチの押圧時 他の機器から自己診断指令信号が送出された場合The present invention includes the following embodiments in addition to the above embodiment. a. In the above embodiment, the self-diagnosis operation is performed when the key switch is turned from the OFF side to the ON side. However, the timing for performing the self-diagnosis operation may be set as follows. Every predetermined time, every predetermined distance When the self-diagnosis switch is pressed When a self-diagnosis command signal is sent from another device
【００３３】ｂ．上記実施例では、カップリングコンデ
ンサ３を車載バッテリ６のマイナス側に接続しているが
プラグ側に接続しても良い。B. In the above embodiment, the coupling capacitor 3 is connected to the minus side of the vehicle-mounted battery 6, but may be connected to the plug side.
【００３４】ｃ．スイッチ素子は、入力- 出力間が絶縁
されていれば、リレー１１以外に、フォトカプラーを使
用したスイッチ、半導体を使用したスイッチなどであっ
ても良い。C. The switch element may be a switch using a photocoupler, a switch using a semiconductor, or the like other than the relay 11 as long as the input and output are insulated.
【００３５】ｄ．上記実施例では、比較器４、制御器
５、及びＬＥＤ制御器５２は各一つであり、地絡検知
（自己診断も含む）を一系統で行っているが、二系統に
して信頼性を高めても良い。D. In the above embodiment, the number of the comparator 4, the controller 5, and the LED controller 52 is one, and the ground fault detection (including the self-diagnosis) is performed by one system. May be raised.
【００３６】ｅ．上記実施例では、走行用モータが交流
モータである交流モータシステムの場合について説明し
たが、直流モータなどを使用する、他の方式でも良い。E. In the above embodiment, the case where the traveling motor is an AC motor system in which the traveling motor is an AC motor has been described. However, another system using a DC motor or the like may be used.
【００３７】ｆ．上記実施例では、地絡試行回路を、車
体- バッテリ母線間に接続した場合について説明した
が、車体- 出力側の給電線間に配設する構成でも良い。
但し、この場合には、制御装置の素子をオンさせる必要
がある。又、地絡試行回路を、スイッチ素子と抵抗を使
用したものについて説明したが、電流を制限でき、更
に、オン／オフできるものであれば使用できる。F. In the above embodiment, the case where the ground fault trial circuit is connected between the vehicle body and the battery bus has been described. However, a configuration in which the ground fault trial circuit is disposed between the vehicle body and the power supply line on the output side may be employed.
However, in this case, it is necessary to turn on the elements of the control device. Also, the ground fault trial circuit has been described using a switch element and a resistor. However, any circuit that can limit current and can be turned on / off can be used.
【図１】本発明の一実施例に係る、電気自動車の地絡検
知システムの回路図である。FIG. 1 is a circuit diagram of a ground fault detection system for an electric vehicle according to an embodiment of the present invention.
【図２】その地絡検知システムＡの自己診断動作を示す
フローチャートである。FIG. 2 is a flowchart showing a self-diagnosis operation of the ground fault detection system A.
【図３】従来の、電気自動車の地絡検知システムの回路
図である。FIG. 3 is a circuit diagram of a conventional ground fault detection system for an electric vehicle.
Ａ 電気自動車の地絡検知システム １ 地絡試行回路 ２ 抵抗（検出用抵抗） ３ カップリングコンデンサ ４ 比較器 ５ 制御器（判別手段、監視手段） ６ 車載バッテリ ７ 交流モータ（走行用モータ） ８ ＤＣ・ＡＣインバータ（制御装置） ９ 地絡検知器（地絡検知手段） １１ リレー（スイッチ素子） １２ 抵抗 ５０ 発振部（矩形波発生手段） ５１ トランジスタ（半導体スイッチ素子） ５２ ＬＥＤ制御器（報知器制御手段、報知器駆動手
段） ５３ ＬＥＤ（報知器） ６１、６２ 母線（バッテリ母線） ８１〜８３ 交流給電線（給電線） ４１１、４１２ 矩形波 ｐ 接続点 Ｖｒ 基準電圧A Ground fault detection system for electric vehicle 1 Ground fault trial circuit 2 Resistance (detection resistor) 3 Coupling capacitor 4 Comparator 5 Controller (discriminating means, monitoring means) 6 In-vehicle battery 7 AC motor (running motor) 8 DC・ AC inverter (control device) 9 ground fault detector (ground fault detecting means) 11 relay (switch element) 12 resistor 50 oscillating unit (rectangular wave generating means) 51 transistor (semiconductor switch element) 52 LED controller (alarm control) Means, alarm drive means) 53 LED (alarm) 61, 62 bus (battery bus) 81-83 AC power supply line (power supply line) 411, 412 square wave p connection point Vr reference voltage
Claims (5)
側を各バッテリ母線に電気接続し出力側を各給電線を介
して前記走行用モータに電気接続した制御装置とを有す
る電気自動車に組み込まれ、 スイッチ素子と抵抗とからなり、車体と何れかのバッテ
リ母線との間に接続され、地絡試行時に前記スイッチ素
子がオン状態にされる地絡試行回路と、 地絡が起きているか否かを検知する地絡検知手段と、 該地絡検知手段が、前記地絡試行時に地絡を検知しない
場合や通常監視時に地絡を検知した場合には、報知器を
作動させる報知器制御手段とを備える電気自動車の地絡
検知システム。1. An electric vehicle having a vehicle-mounted battery, a traveling motor, and a control device having an input side electrically connected to each battery bus and an output side electrically connected to the traveling motor via each power supply line. A ground-fault trial circuit comprising a switch element and a resistor, connected between the vehicle body and one of the battery buses, and the switch element being turned on at the time of a ground-fault trial; Ground fault detection means for detecting whether the ground fault detection means does not detect a ground fault at the time of the ground fault trial or a ground fault detection at the time of normal monitoring. A ground fault detection system for an electric vehicle comprising:
検出用抵抗及びカップリングコンデンサと、 前記検出用抵抗と前記カップリングコンデンサとの接続
点に現れる電圧と、基準電圧との大きさを比較し、地絡
が起きると出力状態が変化する判別手段とを有する請求
項１記載の電気自動車の地絡検知システム。2. The ground fault detecting means comprises: a rectangular wave generating means for outputting a rectangular wave; and a means for applying the rectangular wave to any battery bus.
A detection resistor and a coupling capacitor; a voltage appearing at a connection point between the detection resistor and the coupling capacitor, and a reference voltage, and comparing the magnitude of the reference voltage, and a determination unit that changes an output state when a ground fault occurs. The ground fault detection system for an electric vehicle according to claim 1, comprising:
側を各バッテリ母線に電気接続し出力側を各給電線を介
して前記走行用モータに電気接続した制御装置とを有す
る電気自動車に組み込まれ、 スイッチ素子と抵抗とからなり、車体と何れかのバッテ
リ母線との間に接続され、地絡試行時に前記スイッチ素
子がオン状態にされる地絡試行回路と、 矩形波を出力する矩形波発生手段と、 この矩形波を何れかのバッテリ母線に印加するための、
検出用抵抗及びカップリングコンデンサと、 前記検出用抵抗と前記カップリングコンデンサとの接続
点に現れる電圧と、地絡していない状態において前記接
続点に現れる矩形波の波高値より低く設定した基準電圧
との大きさを比較し、地絡が起きると出力がパルスから
Ｈｉレベルに切り替わる比較器と、 該比較器の出力状態に基づいて地絡試行時の地絡や通常
監視時の地絡を監視し、地絡試行時に地絡を検知した場
合や、通常監視時に地絡を検知しない場合にパルス出力
を送出する監視手段と、 パルス出力以外が入力すると報知器を作動させる報知器
駆動手段とを備える電気自動車の地絡検知システム。3. An electric vehicle having an in-vehicle battery, a traveling motor, and a control device having an input side electrically connected to each battery bus and an output side electrically connected to the traveling motor via each power supply line. A ground-fault trial circuit comprising a switch element and a resistor, connected between the vehicle body and any of the battery buses, wherein the switch element is turned on at the time of a ground-fault trial; Generating means for applying this rectangular wave to any battery bus,
A detection resistor and a coupling capacitor; a voltage appearing at a connection point between the detection resistor and the coupling capacitor; and a reference voltage set lower than a peak value of a rectangular wave appearing at the connection point in a state where no ground fault occurs. And a comparator whose output switches from a pulse to a Hi level when a ground fault occurs, and monitors a ground fault during a ground fault trial and a ground fault during normal monitoring based on the output state of the comparator. Monitoring means for transmitting a pulse output when a ground fault is detected during a ground fault trial or when no ground fault is detected during normal monitoring, and a notifying device driving means for activating an annunciator when a signal other than the pulse output is input. Ground fault detection system for electric vehicles.
素子を介して前記監視手段に接続される請求項３記載の
電気自動車の地絡検知システム。4. The ground fault detection system for an electric vehicle according to claim 3, wherein said alarm drive means is connected to said monitoring means via a semiconductor switch element.
フ状態からオン状態に切り替えた時である請求項１乃至
請求項４の何れかに記載の電気自動車の地絡検知システ
ム。5. The ground fault detection system for an electric vehicle according to claim 1, wherein the time of the ground fault trial is a time when a key switch is switched from an off state to an on state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9025000A JPH10221395A (en) | 1997-02-07 | 1997-02-07 | System for detecting ground fault of electric vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9025000A JPH10221395A (en) | 1997-02-07 | 1997-02-07 | System for detecting ground fault of electric vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10221395A true JPH10221395A (en) | 1998-08-21 |
Family
ID=12153709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9025000A Pending JPH10221395A (en) | 1997-02-07 | 1997-02-07 | System for detecting ground fault of electric vehicle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10221395A (en) |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002098728A (en) * | 2000-07-17 | 2002-04-05 | Matsushita Electric Ind Co Ltd | Electric leak detection device |
| EP1336528A3 (en) * | 2002-02-19 | 2004-02-11 | Bae Systems Controls, Inc. | Ground fault detection system and method |
| EP1521092A1 (en) * | 2003-09-30 | 2005-04-06 | Fanuc Ltd | Motor driver |
| US6970807B2 (en) | 2003-05-29 | 2005-11-29 | Toyota Jidosha Kabushiki Kaisha | Diagnostic system and method for electric leak detecting device |
| JP2007068249A (en) * | 2005-08-29 | 2007-03-15 | Hitachi Vehicle Energy Ltd | Leak detector for electric car |
| JP2007163291A (en) * | 2005-12-14 | 2007-06-28 | Denso Corp | Insulation performance diagnostic device for vehicle-use ground insulation circuit |
| JP2010182586A (en) * | 2009-02-06 | 2010-08-19 | Denso Corp | Switching device, and ground fault detection system for vehicle |
| JP2010217146A (en) * | 2009-03-19 | 2010-09-30 | Denso Corp | Electrical leakage detection system |
| WO2010143534A1 (en) | 2009-06-12 | 2010-12-16 | 日産自動車株式会社 | Connection diagnostic device for ground fault detector |
| US7994799B2 (en) | 2006-08-04 | 2011-08-09 | Toyota Jidosha Kabushiki Kaisha | Insulation resistance detection system, insulation resistance detection apparatus and insulation resistance detection method |
| WO2014034153A1 (en) * | 2012-09-03 | 2014-03-06 | パナソニック株式会社 | Electrical leak detection circuit, battery circuit board, and battery power source device |
| US9103892B2 (en) | 2011-10-26 | 2015-08-11 | Denso Corporation | Ground fault detector |
| EP2866038A4 (en) * | 2012-06-18 | 2016-07-06 | Hitachi Automotive Systems Ltd | Leak detection device |
| JP2017146197A (en) * | 2016-02-17 | 2017-08-24 | 株式会社ケーヒン | Ground fault detector |
| WO2017168835A1 (en) * | 2016-03-30 | 2017-10-05 | 株式会社豊田自動織機 | Ground fault detection circuit diagnosing device |
| JP2018085923A (en) * | 2015-08-19 | 2018-05-31 | 日本精工株式会社 | Electronic control device and electric power steering device equipped with the same |
| JP2019111877A (en) * | 2017-12-21 | 2019-07-11 | 株式会社デンソー | Repeating device |
| JP2022070050A (en) * | 2020-10-26 | 2022-05-12 | 株式会社デンソーテン | Earth leakage detection device and earth leakage detection method |
-
1997
- 1997-02-07 JP JP9025000A patent/JPH10221395A/en active Pending
Cited By (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002098728A (en) * | 2000-07-17 | 2002-04-05 | Matsushita Electric Ind Co Ltd | Electric leak detection device |
| EP1336528A3 (en) * | 2002-02-19 | 2004-02-11 | Bae Systems Controls, Inc. | Ground fault detection system and method |
| EP2386439A3 (en) * | 2002-02-19 | 2013-02-20 | BAE Systems Controls Inc. | Ground fault detection system and method |
| CN100370266C (en) * | 2003-05-29 | 2008-02-20 | 丰田自动车株式会社 | Diagnostic system and method for electric leak detecting device |
| US6970807B2 (en) | 2003-05-29 | 2005-11-29 | Toyota Jidosha Kabushiki Kaisha | Diagnostic system and method for electric leak detecting device |
| EP1521092A1 (en) * | 2003-09-30 | 2005-04-06 | Fanuc Ltd | Motor driver |
| US7064516B2 (en) | 2003-09-30 | 2006-06-20 | Fanuc Ltd | Motor driver |
| JP2007068249A (en) * | 2005-08-29 | 2007-03-15 | Hitachi Vehicle Energy Ltd | Leak detector for electric car |
| JP2007163291A (en) * | 2005-12-14 | 2007-06-28 | Denso Corp | Insulation performance diagnostic device for vehicle-use ground insulation circuit |
| JP4572829B2 (en) * | 2005-12-14 | 2010-11-04 | 株式会社デンソー | Insulation performance diagnostic device for ground insulation circuit for vehicles |
| US7994799B2 (en) | 2006-08-04 | 2011-08-09 | Toyota Jidosha Kabushiki Kaisha | Insulation resistance detection system, insulation resistance detection apparatus and insulation resistance detection method |
| JP2010182586A (en) * | 2009-02-06 | 2010-08-19 | Denso Corp | Switching device, and ground fault detection system for vehicle |
| JP2010217146A (en) * | 2009-03-19 | 2010-09-30 | Denso Corp | Electrical leakage detection system |
| JP5533864B2 (en) * | 2009-06-12 | 2014-06-25 | 日産自動車株式会社 | Ground fault detector connection diagnosis device |
| JPWO2010143534A1 (en) * | 2009-06-12 | 2012-11-22 | 日産自動車株式会社 | Ground fault detector connection diagnosis device |
| WO2010143534A1 (en) | 2009-06-12 | 2010-12-16 | 日産自動車株式会社 | Connection diagnostic device for ground fault detector |
| US8847605B2 (en) | 2009-06-12 | 2014-09-30 | Nissan Motor Co., Ltd. | Connection diagnostic apparatus for ground fault detector |
| US9103892B2 (en) | 2011-10-26 | 2015-08-11 | Denso Corporation | Ground fault detector |
| EP2866038A4 (en) * | 2012-06-18 | 2016-07-06 | Hitachi Automotive Systems Ltd | Leak detection device |
| WO2014034153A1 (en) * | 2012-09-03 | 2014-03-06 | パナソニック株式会社 | Electrical leak detection circuit, battery circuit board, and battery power source device |
| JP2018085923A (en) * | 2015-08-19 | 2018-05-31 | 日本精工株式会社 | Electronic control device and electric power steering device equipped with the same |
| JP2018099026A (en) * | 2015-08-19 | 2018-06-21 | 日本精工株式会社 | Electronic control device and electrically-driven power steering device with the same mounted therein |
| JP2018113851A (en) * | 2015-08-19 | 2018-07-19 | 日本精工株式会社 | Electronic controller and electric power steering device mounting the same |
| CN107091964A (en) * | 2016-02-17 | 2017-08-25 | 株式会社京滨 | Ground detection device |
| JP2017146197A (en) * | 2016-02-17 | 2017-08-24 | 株式会社ケーヒン | Ground fault detector |
| WO2017168835A1 (en) * | 2016-03-30 | 2017-10-05 | 株式会社豊田自動織機 | Ground fault detection circuit diagnosing device |
| JP2019111877A (en) * | 2017-12-21 | 2019-07-11 | 株式会社デンソー | Repeating device |
| JP2022070050A (en) * | 2020-10-26 | 2022-05-12 | 株式会社デンソーテン | Earth leakage detection device and earth leakage detection method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH10221395A (en) | System for detecting ground fault of electric vehicle | |
| CN108604516B (en) | Relay device | |
| KR101291895B1 (en) | Electric leakage sensing apparatus | |
| JP4265381B2 (en) | Relay failure determination device and relay failure determination method | |
| JP2000173428A (en) | Main relay welding detecting device for electric car | |
| JP2018098959A (en) | On-vehicle unit | |
| JP2006310219A (en) | Relay fusion bonding detecting device | |
| CN109923011B (en) | Switching circuit, fault detection method thereof and control device | |
| JPH10341524A (en) | Signal transmitter for mounting on vehicle, and signal transmission method, and power supply controller for mounting on vehicle, and power method, and cable abnormality detector for mounting on vehicle | |
| JP2006177840A (en) | Earth fault detector and diagnosis method of earth fault detector | |
| JPH11283456A (en) | Switch, information detection device having the same, and connected state detection device for connector | |
| JP6533699B2 (en) | Energization control device, electrification control method and disconnection detection device | |
| JP4668594B2 (en) | On-off control device | |
| JP5083242B2 (en) | Switch device and vehicle ground fault detection system | |
| JP2001524408A (en) | Actuator circuit device and inspection method thereof | |
| JP2003019934A (en) | Battery exhaustion preventive device | |
| JP3728402B2 (en) | In particular, a data transmission system and a data transmission method in a vehicle | |
| JPH07274303A (en) | Power supply controller for vehicle | |
| JP2001037069A (en) | Load drive device with open-circuit detecting function | |
| KR100848493B1 (en) | Method for prevention relay short error miss-detection of electronic control unit | |
| JP2003297166A (en) | Courtesy switching device | |
| JP2003040052A (en) | Load diagnostic circuit | |
| CN114559817B (en) | Vehicle control method, controller and vehicle | |
| KR970048533A (en) | Power cable short circuit detection device of electric vehicle | |
| JP3090819U (en) | Vehicle battery charger with automatic detection switching |