JPH07166842A - Method and equipment for monitoring heating element in catalyst apparatus for automobile - Google Patents

Method and equipment for monitoring heating element in catalyst apparatus for automobile

Info

Publication number
JPH07166842A
JPH07166842A JP6255195A JP25519594A JPH07166842A JP H07166842 A JPH07166842 A JP H07166842A JP 6255195 A JP6255195 A JP 6255195A JP 25519594 A JP25519594 A JP 25519594A JP H07166842 A JPH07166842 A JP H07166842A
Authority
JP
Japan
Prior art keywords
heating element
voltage
intermediate tap
catalytic converter
monitoring
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.)
Granted
Application number
JP6255195A
Other languages
Japanese (ja)
Other versions
JP3437656B2 (en
Inventor
Eberhard Schnaibel
シュナイベル エーベルハルト
Dieter Schuler
シューラー ディーター
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of JPH07166842A publication Critical patent/JPH07166842A/en
Application granted granted Critical
Publication of JP3437656B2 publication Critical patent/JP3437656B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
    • F01N3/2807—Metal other than sintered metal
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Testing Of Engines (AREA)

Abstract

PURPOSE: To monitor an electric heating element in a catalytic converter by providing an intermediate tap between the first and second terminals of the heating element, and determining whether or not the heating element is operating normally according to a voltage applied to the intermediate tap. CONSTITUTION: The terminal A of a heating element 102 is connected to the positive electrode of a battery 106 via a switch 104. The terminal B of the heating element 102 is connected to the negative electrode of the battery 106. An intermediate tap C is provided between the terminals A, B of the heating element 102 and an evaluation block 108 is connected to the intermediate tap C. The evaluation block 108 indicates a defect when a voltage measured at the intermediate tap C deviates from the voltage of the battery 106 by a quantity greater than an allowable deviation. The closure of the switch 104 is also indicated when a certain voltage different from zero is applied at the intermediate tap C. Therefore, measurements of the voltages of the electric heating element in a catalytic converter can be detected even in case of minimum changes.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、請求項１の上位概念に
記載の自動車の触媒器の中の加熱素子の監視装置と、こ
の装置が使用される方法とに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a monitoring device for heating elements in a catalytic converter of a motor vehicle according to the preamble of claim 1 and to the method in which this device is used.

【０００２】[0002]

【従来の技術】自動車の有害物質の放出を低減するため
に、自動車の内燃機関の排気ガスは、排気ガスに含まれ
る有害物質をより有害度の低い物質に変換する触媒器に
供給される。有害物質の変換は触媒器の最低動作温度よ
り上でのみ行われるので、触媒器を規則的に加熱すると
好適である。触媒器の加熱は、例えば電気加熱素子によ
り行うことができる。電気加熱素子を有する触媒器は、
ドイツ特許出願公開第２２３０６６３号公報から公知で
ある。この明細書に記載の電気加熱素子は、抵抗線から
成る卷線を含み触媒器の中央に配置されている管状構成
要素から成る。In order to reduce the emission of harmful substances in motor vehicles, the exhaust gas of the internal combustion engine of the motor vehicle is fed to a catalytic converter which converts the harmful substances contained in the exhaust gas into less harmful substances. Since the conversion of harmful substances takes place only above the minimum operating temperature of the catalytic converter, it is advantageous to heat the catalytic converter regularly. The heating of the catalytic converter can be performed, for example, by an electric heating element. A catalytic device with an electric heating element,
It is known from DE 22 30 663. The electric heating element described in this specification consists of a tubular component which includes a winding of resistance wire and which is arranged centrally in the catalytic converter.

【０００３】加熱素子が故障すると有害物質の放出量が
増加するので、加熱素子を監視すると好適である。加熱
素子の監視は技術的に非常に実現困難である、何故なら
ば加熱素子は電気抵抗値が非常に小さく、このように小
さい抵抗値を正確に測定することは非常に複雑でコスト
がかかるからである。このような測定における１つの問
題は、例えば測定ケーブルが加熱素子の端子ケーブルに
接触接続することにある。これらの接触接続の接触抵抗
値は、十分に正確な測定を可能にするためにできるだけ
小さく全寿命期間にわたり一定でなければならない。加
熱素子の抵抗値の代りに例えば、加熱素子がスイッチオ
ンの際に流れる電流を監視することもできる。しかしこ
の変形装置も大きい困難を有する、何故ならば電流は通
常は１００アンペアのオーダにあり、従ってコストのか
かる測定技術が必要であるからである。It is advantageous to monitor the heating element, because if the heating element fails, the amount of harmful substances emitted will increase. Monitoring of heating elements is technically very difficult to realize because heating elements have very low electrical resistance values, and it is very complicated and costly to accurately measure such low resistance values. Is. One problem with such measurements is, for example, that the measuring cable makes a contact connection with the terminal cable of the heating element. The contact resistance value of these contact connections must be as small as possible and constant over the entire lifetime in order to allow a sufficiently accurate measurement. Instead of the resistance value of the heating element, it is also possible, for example, to monitor the current flowing when the heating element is switched on. However, this variant also has great difficulty, since the currents are usually on the order of 100 amps and thus require expensive measuring techniques.

【０００４】[0004]

【発明が解決しようとする課題】本発明の課題は、触媒
器の中の電気加熱素子の信頼性の高い監視を可能にする
ことにある。The object of the present invention is to enable a reliable monitoring of the electric heating elements in a catalytic converter.

【０００５】[0005]

【課題を解決するための手段】上記課題は、請求項１又
は請求項７の特徴部分に記載の特徴により解決される。The above problem can be solved by the features described in the characterizing portion of claim 1 or claim 7.

【０００６】本発明の装置は、電圧測定に用いられる中
間タップが加熱素子に設けられている。加熱素子がスイ
ッチオンされて正常に動作する場合、中間タップにはバ
ッテリー電圧の部分の電圧が測定される、何故ならばバ
ッテリーの負極と中間タップの間の電気抵抗値と中間タ
ップとバッテリーの正極との間の抵抗値とが等しいから
である。電気回路のどこかの個所で電気抵抗値が変化す
ると、対称性が崩れ、中間タップで測定される電圧がず
れる。従って本発明は、技術的に非常に容易に実現でき
る電圧測定により加熱電気回路の中の最小の変化でも検
出できる利点を有する。加熱素子の抵抗値は非常に小さ
いにもかかわらず、電流が大きなため容易に測定可能な
電圧降下が発生する。In the device of the invention, the heating element is provided with an intermediate tap used for voltage measurement. When the heating element is switched on and operates normally, the voltage at the part of the battery voltage is measured at the middle tap, because the electrical resistance between the negative and middle taps of the battery and the positive pole of the middle and battery. This is because the resistance value between and is the same. If the electrical resistance changes somewhere in the electrical circuit, the symmetry breaks and the voltage measured at the center tap shifts. The invention thus has the advantage that even the smallest changes in the heating electric circuit can be detected by means of voltage measurements which are technically very easy to implement. Although the resistance of the heating element is very small, the large current causes an easily measurable voltage drop.

【０００７】本発明の別の１つの利点は、加熱回路の中
に配置されているスイッチの切換え状態を監視できるこ
とにある。加熱素子の中間タップに電圧が印加されてい
る場合にはスイッチは閉成されている。Another advantage of the present invention is the ability to monitor the switching status of switches located in the heating circuit. The switch is closed when a voltage is applied to the center tap of the heating element.

【０００８】本発明の１つの有利な実施例では付加的
に、加熱素子のスイッチオンにより発生されるバッテリ
ー電圧の落込みが評価され、これにより、希であるが原
理的に可能な場合、すなわち抵抗値は変化するが中間タ
ップに対する対称性は維持される場合も検出される。In one advantageous embodiment of the invention, the voltage drop of the battery caused by the switching on of the heating element is additionally evaluated, which is a rare but principally possible case: It is also detected when the resistance value changes but the symmetry with respect to the center tap is maintained.

【０００９】[0009]

【実施例】次に本発明を実施例に基づき図を用いて詳細
に説明する。The present invention will now be described in detail with reference to the drawings based on an embodiment.

【００１０】図１は、加熱素子１０２を有する触媒器１
００を示す。加熱素子１０２の端子Ａはスイッチ１０４
を介してバッテリー１０６の正極に接続されている。加
熱素子１０２の端子Ｂは、バッテリー１０６の負極に接
続されている。加熱素子１０７の端子ＡとＢとの間には
中間タップＣが設けられている。中間タップＣは評価ブ
ロック１０８に接続されている。さらに評価ブロック１
０８は、バッテリー１０６の正極及び負極に接続されて
いる。FIG. 1 shows a catalytic device 1 having a heating element 102.
Indicates 00. Terminal A of heating element 102 is switch 104
It is connected to the positive electrode of the battery 106 via. The terminal B of the heating element 102 is connected to the negative electrode of the battery 106. An intermediate tap C is provided between the terminals A and B of the heating element 107. The intermediate tap C is connected to the evaluation block 108. Further evaluation block 1
08 is connected to the positive electrode and the negative electrode of the battery 106.

【００１１】本発明は次の動作原理を基礎にしいてい
る。The invention is based on the following operating principle.

【００１２】次の電圧情報のための基準電位としてその
都度にバッテリー１０８の負極が用いられる。加熱素子
１０２の中間タップＣには、零とは異なる電圧ＵＣが、
スイッチ１０４が閉成されている場合にのみ印加され
る、すなわち中間タップＣで電圧ＵＣが測定される場合
にはスイッチ１０４が閉成されている。さらに、加熱素
子１０２とそのすべてのリード線とが正常な状態にある
場合、中間タップＣで測定された電圧ＵＣは、バッテリ
ー電圧ＵＢａｔｔの１／２に等しい。すなわち、電圧Ｕ
Ｃが最大でもバッテリー電圧ＵＢａｔｔの１／２から許
容偏差ｄＵの範囲内でずれている間は触媒器１００は正
常に加熱素子１０２により加熱されている。これに対し
てずれが、許容偏差ｄＵより大きい場合、加熱素子１０
２の加熱効果は制限されている。加熱効果は、ずれが大
きいほど小さい。許容偏差を越えると、それが運転者に
適切な表示手段により伝達され、従って運転者は修理工
場を探して故障を修理させる。極端な場合、中間タップ
Ｃで電圧が測定されない、又は最大のバッテリー電圧Ｕ
Ｂａｔｔが測定される。これは、バッテリー１０６の正
極と中間タップＣとの間の回路又はバッテリー１０６の
負極と中間タップＣとの間の回路が破断された場合に発
生する。評価ブロック１０８は、中間タップＣで測定さ
れた電圧ＵＣがバッテリー電圧ＵＢａｔｔの１／２から
許容偏差ｄＵより大きくずれている場合には必ず欠陥を
表示するように構成されている。さらに、評価ブロック
１０８はスイッチ１０４が、中間タップＣで零とは異な
る任意の電圧ＵＣが印加されている場合に閉成されてい
ることを表示する。As a reference potential for the next voltage information, the negative electrode of the battery 108 is used each time. At the center tap C of the heating element 102, a voltage UC different from zero is
Applied only when switch 104 is closed, i.e. switch 104 is closed when voltage UC is measured at center tap C. Furthermore, when the heating element 102 and all its leads are in a normal state, the voltage UC measured at the center tap C is equal to half the battery voltage UBatt. That is, the voltage U
Even if C is the maximum, the catalyst unit 100 is normally heated by the heating element 102 while it deviates from 1/2 of the battery voltage UBatt within the allowable deviation dU. On the other hand, if the deviation is larger than the allowable deviation dU, the heating element 10
The heating effect of 2 is limited. The larger the deviation, the smaller the heating effect. If the tolerance is exceeded, it is communicated to the driver by means of suitable indicators, so that the driver seeks out a repair shop to fix the fault. In extreme cases, no voltage is measured at the intermediate tap C or the maximum battery voltage U
Batt is measured. This occurs when the circuit between the positive electrode of the battery 106 and the intermediate tap C or the circuit between the negative electrode of the battery 106 and the intermediate tap C is broken. The evaluation block 108 is configured to display a defect whenever the voltage UC measured at the intermediate tap C deviates from 1/2 of the battery voltage UBatt by more than the permissible deviation dU. In addition, the evaluation block 108 indicates that the switch 104 is closed when any voltage UC at the intermediate tap C different from zero is applied.

【００１３】非常に希であるが原理的に可能な場合、す
なわち加熱素子１０２の中間タップＣとバッテリー１０
６の正極との間の回路及び中間タップＣとバッテリー１
０６の負極との間の回路とにそれぞれ互いにまったく同
一の欠陥が発生した場合、中間タップＣにバッテリー電
圧ＵＢａｔｔの１／２が印加され、従って評価ブロック
１０８は、誤って、加熱素子が完全に機能していると伝
達する。本発明の１つの実施例では、加熱素子の機能能
力のための付加的な基準が用いられる。この付加的な基
準は、バッテリー１０６が加熱素子１０２により非常に
強く負荷され、従ってバッテリー電圧ＵＢａｔｔがスイ
ッチ１０４の閉成時に低下する事実を基礎にしている。
加熱素子１０２を流れる電流が大きいほど、バッテリー
電圧ＵＢａｔｔはスイッチ１０４の閉成時により大きく
低下する。評価ブロック１０８は、スイッチ１０４の閉
成時のバッテリー電圧ＵＢａｔｔの低下の大きさを求
め、求められた値が所定領域内にあるかどうかを調べ
る。この値が所定領域の外部にある場合、欠陥が、中間
タップＣに印加されている電圧ＵＣの値とは無関係に表
示される。これに対して所定領域内にある場合、前述の
ように電圧ＵＣに基づいて欠陥の発生の有無が判断され
る。In very rare but theoretically possible cases, namely the intermediate tap C of the heating element 102 and the battery 10.
Circuit between positive electrode 6 and intermediate tap C and battery 1
If exactly the same defects occur in the circuit between 06 and the negative electrode, respectively, 1/2 of the battery voltage UBatt is applied to the intermediate tap C, so that the evaluation block 108 incorrectly determines that the heating element is completely Communicate that it is working. In one embodiment of the invention, additional criteria for the functional capabilities of the heating element are used. This additional criterion is based on the fact that the battery 106 is very strongly loaded by the heating element 102, so that the battery voltage UBatt drops when the switch 104 is closed.
The larger the current flowing through the heating element 102, the more the battery voltage UBatt will drop more when the switch 104 is closed. The evaluation block 108 determines the magnitude of the decrease in the battery voltage UBatt when the switch 104 is closed, and checks whether the obtained value is within a predetermined range. If this value is outside the predetermined area, the defect is displayed independently of the value of the voltage UC applied to the intermediate tap C. On the other hand, when it is within the predetermined region, it is determined whether or not a defect is generated based on the voltage UC as described above.

【００１４】図２には、図１の本発明の装置が使用でき
る方法のフローチャートが示されている。第１のステッ
プ２００でスイッチ１０４が閉成される。次いでステッ
プ２０２でバッテリー電圧ＵＢａｔｔと、加熱素子１０
２の中間タップＣに印加されている電圧ＵＣとが測定さ
れる。次いでステップ２０４で、電圧ＵＣが零と異なる
か否か調べる。零と異ならないとき、すなわちノーの場
合（Ｎ）、ステップ２０６が続き、このステップ２０６
でスイッチ１０４が開放される。スイッチ位置について
の情報は、例えばスイッチ位置の監視のための法定の機
能モジュールの範囲内等で必要に応じてさらに処理され
る。ステップ２０６でフローチャートの進行は終了す
る。FIG. 2 shows a flow chart of the method by which the inventive device of FIG. 1 can be used. In the first step 200, the switch 104 is closed. Then, in step 202, the battery voltage UBatt and the heating element 10
The voltage UC applied to the second intermediate tap C is measured. Then, in step 204, it is checked whether the voltage UC is different from zero. If it is not different from zero, that is, if it is no (N), then step 206 follows, and this step 206
Then, the switch 104 is opened. The information about the switch position is further processed as required, eg within the scope of legal functional modules for monitoring the switch position. At step 206, the flow chart ends.

【００１５】ステップ２０４で、電圧ＵＣが零とは異な
ることが検出された場合すなわちイエスの場合（Ｊ）、
ステップ２０４にステップ２０８が続く。ステップ２０
８でスイッチ１０４が閉成される。ステップ２０６と同
様、この情報は、スイッチ位置監視のための機能モジュ
ールが設けられている場合にはこの機能モジュールでで
さらに処理できる。ステップ２０８にステップ２１０が
続き、ステップ２１０で、理想値からのずれＵＣの大き
さが求められる。このために、電圧ＵＣとバッテリー電
圧ＵＢａｔｔの１／２との差の絶対値が求められる。次
いでステップ２１２で、このようにして求められたずれ
が許容偏差ｄＵより小さいかどうかを調べる。許容偏差
より小さかった場合、すなわちイエス（Ｊ）の場合ステ
ップ２１４が続き、ステップ２１４では欠陥がないと結
論される。ノー（ｎ）の場合、ステップ２１６が続き、
ステップ２１６では欠陥が検出される。欠陥は記憶及び
／又は運転者に表示することができる。ステップ２１４
でもステップ２１６でもフローチャートの進行が終了す
る。If in step 204 it is detected that the voltage UC is different from zero, ie yes (J),
Step 204 is followed by step 208. Step 20
At 8 the switch 104 is closed. Similar to step 206, this information can be further processed by a functional module for switch position monitoring, if provided. Step 208 is followed by step 210, in which the magnitude of the deviation UC from the ideal value is determined. For this purpose, the absolute value of the difference between the voltage UC and 1/2 of the battery voltage UBatt is determined. Then, in step 212, it is checked whether the deviation thus obtained is smaller than the allowable deviation dU. If it is smaller than the allowable deviation, that is, if it is YES (J), step 214 is continued, and it is concluded that there is no defect in step 214. If no (n), then step 216 continues,
In step 216, defects are detected. Defects can be stored and / or displayed to the driver. Step 214
However, in step 216, the flow chart ends.

【００１６】スイッチ１０４の閉成時のバッテリー電圧
低下が付加的に考慮される本発明の前述の実施例は、僅
かな数の付加的なステップを図２のフローチャートに挿
入することにより実現できる。The above-described embodiment of the present invention in which the battery voltage drop when the switch 104 is closed is additionally taken into account can be realized by inserting a few additional steps into the flow chart of FIG.

【００１７】ステップ２００の前にすでにバッテリー電
圧ＵＢａｔｔが測定され、ステップ２０８の後に挿入さ
れるステップで、ステップ２０２で測定されたバッテリ
ー電圧ＵＢａｔｔと比較される。このようにして求めら
れたバッテリー電圧ＵＢａｔｔの２つの値が許容偏差領
域の外部にある場合、欠陥が存在してフローチャートの
進行が終了する。これに対して差が許容偏差領域内にあ
る場合、フローチャートの進行はステップ２１０に続
く。The battery voltage UBatt is already measured before step 200 and compared with the battery voltage UBatt measured in step 202 in a step inserted after step 208. When the two values of the battery voltage UBatt obtained in this way are outside the permissible deviation range, there is a defect and the flow chart ends. If, on the other hand, the difference is within the tolerance zone, the flow chart continues at step 210.

【００１８】前述の実施例は、加熱素子１０２の中間タ
ップＣが端子ＡとＢとの間の中間に配置されており、従
って加熱素子が完全に機能している場合には一方の端子
Ａ又はＢと中間タップＣの間の抵抗値と他方の端子Ｂ又
はＡと中間タップＣとの間の抵抗値とが同一である場合
に関する。しかし、中間タップＣが端子Ａ及びＢのうち
の一方に他方より近い実施例も可能である。この場合、
中間タップＣに印加されている電圧を評価するためにバ
ッテリー電圧ＵＢａｔｔの１／２を用いるのではなく、
バッテリー電圧ＵＢａｔｔの中間タップＣの位置に相当
する部分電圧が用いられる。In the embodiment described above, the center tap C of the heating element 102 is located in the middle between the terminals A and B, so that when the heating element is fully functional, one terminal A or It relates to the case where the resistance value between B and the intermediate tap C and the resistance value between the other terminal B or A and the intermediate tap C are the same. However, embodiments are possible in which the intermediate tap C is closer to one of the terminals A and B than the other. in this case,
Instead of using 1/2 of the battery voltage UBatt to evaluate the voltage applied to the center tap C,
A partial voltage corresponding to the position of the intermediate tap C of the battery voltage UBatt is used.

【図面の簡単な説明】[Brief description of drawings]

【図１】加熱素子を有する触媒器のブロック回路図であ
る。FIG. 1 is a block circuit diagram of a catalytic converter having a heating element.

【図２】本発明の装置を用いることができる方法のフロ
ーチャートである。FIG. 2 is a flow chart of a method in which the device of the present invention can be used.

【符号の説明】[Explanation of symbols]

１００ 触媒器 １０２ 加熱素子 １０４ スイッチ １０６ バッテリー １０８ 評価ブロック Ａ，Ｂ 端子 Ｃ 中間タップ ＵＢａｔｔ バッテリー電圧 ＵＣ 電圧 100 Catalyzer 102 Heating Element 104 Switch 106 Battery 108 Evaluation Block A, B Terminal C Middle Tap UBatt Battery Voltage UC Voltage

───────────────────────────────────────────────────── フロントページの続き (72)発明者 ディーター シューラー ドイツ連邦共和国 マークシュタット ヴ ァイアーシュトラーセ 11 ─────────────────────────────────────────────────── —————————————————————————————————————————————————————————————————————————— Marksstadt Weierstraße 11

Claims (9)

【特許請求の範囲】[Claims] 【請求項１】 自動車の触媒器（１００）の中の加熱素
子（１０２）が第１の端子（Ａ）と第２の端子（Ｂ）と
を有し、前記加熱素子（１０２）の双方の前記端子
（Ａ，Ｂ）に電圧（ＵＢａｔｔ）を印加すると、前記加
熱素子（１０２）を加熱する電流が前記加熱素子（１０
２）に流れる、自動車の触媒器の中の加熱素子の監視装
置において、前記加熱素子（１０２）の前記第１の端子
（Ａ）と前記第２の端子（Ｂ）との間に中間タップ
（Ｃ）を設け、前記中間タップ（Ｃ）に印加されている
電圧（ＵＣ）に基づいて、前記加熱素子（１０２）が正
常に動作しているかどうか判断することを特徴とする自
動車の触媒器の中の加熱素子の監視装置。1. A heating element (102) in a catalytic converter (100) of a motor vehicle has a first terminal (A) and a second terminal (B), both of which heating element (102). When a voltage (UBatt) is applied to the terminals (A, B), a current for heating the heating element (102) is applied to the heating element (10).
In the monitoring device for the heating element in the catalytic converter of the automobile flowing in 2), an intermediate tap (between the first terminal (A) and the second terminal (B) of the heating element (102). C) is provided, and whether the heating element (102) is operating normally is determined based on the voltage (UC) applied to the intermediate tap (C). Monitoring device for heating elements inside. 【請求項２】 加熱素子（１０２）が、中間タップ
（Ｃ）に加されている電圧（ＵＣ）が双方の端子（Ａ，
Ｂ）に印加されている電圧（ＵＢａｔｔ）の部分電圧か
ら最大許容偏差値（ｄＵ）の範囲内で、ずれていること
を特徴とする請求項１に記載の自動車の触媒器の中の加
熱素子の監視装置。2. The heating element (102) has a voltage (UC) applied to the intermediate tap (C) at both terminals (A,
2. The heating element in the catalytic converter of a motor vehicle according to claim 1, characterized in that it deviates from the partial voltage of the voltage (UBatt) applied to B) by a maximum permissible deviation value (dU). Monitoring equipment. 【請求項３】 前記部分電圧数が、加熱素子（１０２）
の２つの端子（Ａ，Ｂ）の間の中間タップ（Ｃ）の位置
に依存して決められていることを特徴とする請求項２に
記載の自動車の触媒器の中の加熱素子の監視装置。3. The heating element (102) wherein the partial voltage number is
Device for monitoring heating elements in a catalytic converter of a motor vehicle according to claim 2, characterized in that it is determined depending on the position of the intermediate tap (C) between the two terminals (A, B) of the vehicle. . 【請求項４】 中間タップ（Ｃ）を、加熱素子（１０
２）の２つの端子（Ａ，Ｂ）の間の中間に配置して、部
分電圧が電圧（ＵＢａｔｔ）の１／２であることを特徴
とする請求項３に記載の自動車の触媒器の中の加熱素子
の監視装置。4. An intermediate tap (C) is provided with a heating element (10).
The intermediate catalytic converter according to claim 3, characterized in that it is arranged in the middle between the two terminals (A, B) of 2) and the partial voltage is ½ of the voltage (UBatt). Monitoring device for heating elements. 【請求項５】 加熱素子（１０２）への電流供給をスイ
ッチ（１０４）により遮断でき、中間タップ（Ｃ）に印
加されている電圧（ＵＣ）に基づいてスイッチ位置を検
出することができる請求項１から請求項４のうちのいず
れか１つの請求項に記載の自動車の触媒器の中の加熱素
子の監視装置。5. The switch (104) can interrupt the current supply to the heating element (102) and the switch position can be detected based on the voltage (UC) applied to the intermediate tap (C). Monitoring device for a heating element in a catalytic converter of a motor vehicle according to any one of claims 1 to 4. 【請求項６】 スイッチ（１０４）が、零と異なる電圧
（ＵＣ）が中間タップ（Ｃ）に印加されると閉成するこ
とを特徴とする請求項５に記載の自動車の触媒器の中の
加熱素子の監視装置。6. A motor vehicle catalyzer according to claim 5, characterized in that the switch (104) closes when a voltage (UC) different from zero is applied to the intermediate tap (C). Monitoring device for heating elements. 【請求項７】 自動車の触媒器（１００）の中の加熱素
子（１０２）の監視方法において、前記加熱素子（１０
２）の中間タップ（Ｃ）に印加されている（ＵＣ）に基
づいて、前記加熱素子（１０２）が正常に動作している
かどうか判断することを特徴とする自動車の触媒器の中
の加熱素子の監視方法。7. A method of monitoring a heating element (102) in a catalytic converter (100) of a motor vehicle, comprising the heating element (10).
A heating element in a catalytic converter of an automobile, characterized in that it is judged whether or not the heating element (102) is normally operating based on (UC) applied to the intermediate tap (C) of 2). Monitoring method. 【請求項８】 加熱素子（１０２）が、中間タップ
（Ｃ）に印加されている電圧（ＵＣ）が２つの端子
（Ａ，Ｂ）に印加されている電圧（ＵＢａｔｔ）の所定
の部分電圧から最大許容偏差値（ｄＵ）の範囲内で、ず
れていることを特徴とする請求項７に記載の自動車の触
媒器の中の加熱素子の監視方法。8. The heating element (102) is arranged such that the voltage (UC) applied to the intermediate tap (C) is a predetermined partial voltage of the voltage (UBatt) applied to the two terminals (A, B). 8. The method of monitoring heating elements in a catalytic converter of a motor vehicle according to claim 7, characterized in that the deviations are within a maximum permissible deviation value (dU). 【請求項９】 加熱素子（１０２）が、前記加熱素子
（１０２）が動作を開始すると供給電圧が低下し、この
電圧低下の大きさが所定領域内にある場合には正常に動
作することを特徴とする請求項７又は請求項８に記載の
自動車の触媒器の中の加熱素子の監視方法。9. The heating element (102) operates normally when the supply voltage drops when the heating element (102) starts operating and the magnitude of the voltage drop is within a predetermined range. 9. A method for monitoring a heating element in a catalytic converter of a motor vehicle according to claim 7 or claim 8.
JP25519594A 1993-10-22 1994-10-20 Method and apparatus for monitoring heating elements in automotive catalyzers Expired - Fee Related JP3437656B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4336091.2 1993-10-22
DE4336091A DE4336091B4 (en) 1993-10-22 1993-10-22 Device for monitoring an electrical heating element in a catalytic converter of a motor vehicle and method in which the device is used

Publications (2)

Publication Number Publication Date
JPH07166842A true JPH07166842A (en) 1995-06-27
JP3437656B2 JP3437656B2 (en) 2003-08-18

Family

ID=6500783

Family Applications (1)

Application Number Title Priority Date Filing Date
JP25519594A Expired - Fee Related JP3437656B2 (en) 1993-10-22 1994-10-20 Method and apparatus for monitoring heating elements in automotive catalyzers

Country Status (2)

Country Link
JP (1) JP3437656B2 (en)
DE (1) DE4336091B4 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09158717A (en) * 1995-12-08 1997-06-17 Toyota Motor Corp Power supply control device of electric heating catalyst
DE19646025C2 (en) * 1996-11-08 1999-07-01 Heinrich Schuermann Heating arrangement for a catalyst
DE102021114496B4 (en) 2021-06-07 2023-10-26 Audi Aktiengesellschaft Method for operating a drive device for a motor vehicle and corresponding drive device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3768982A (en) * 1971-06-22 1973-10-30 Ford Motor Co Catalytic converter with electrically preheated catalyst
DE3920159A1 (en) * 1989-06-20 1991-01-10 Emitec Emissionstechnologie Heat generation by flameless combustion in gas flow

Also Published As

Publication number Publication date
JP3437656B2 (en) 2003-08-18
DE4336091A1 (en) 1995-04-27
DE4336091B4 (en) 2005-03-17

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