JP2003129894A - Sensor signal detection circuit for automobile, engine control unit and circuit unit - Google Patents
Sensor signal detection circuit for automobile, engine control unit and circuit unitInfo
- Publication number
- JP2003129894A JP2003129894A JP2001327455A JP2001327455A JP2003129894A JP 2003129894 A JP2003129894 A JP 2003129894A JP 2001327455 A JP2001327455 A JP 2001327455A JP 2001327455 A JP2001327455 A JP 2001327455A JP 2003129894 A JP2003129894 A JP 2003129894A
- Authority
- JP
- Japan
- Prior art keywords
- sensor
- sensor signal
- reference voltage
- signal
- automobile
- 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
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 31
- 239000003990 capacitor Substances 0.000 claims abstract description 17
- 239000000446 fuel Substances 0.000 claims abstract description 5
- 230000010355 oscillation Effects 0.000 claims description 15
- 230000006866 deterioration Effects 0.000 claims description 5
- 239000000758 substrate Substances 0.000 abstract description 3
- 230000015556 catabolic process Effects 0.000 abstract 1
- 238000006731 degradation reaction Methods 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 101100321669 Fagopyrum esculentum FA02 gene Proteins 0.000 description 1
- 101000805729 Homo sapiens V-type proton ATPase 116 kDa subunit a 1 Proteins 0.000 description 1
- 101000854873 Homo sapiens V-type proton ATPase 116 kDa subunit a 4 Proteins 0.000 description 1
- 101000806601 Homo sapiens V-type proton ATPase catalytic subunit A Proteins 0.000 description 1
- 102100037979 V-type proton ATPase 116 kDa subunit a 1 Human genes 0.000 description 1
- 102100020737 V-type proton ATPase 116 kDa subunit a 4 Human genes 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
Classifications
-
- 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
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、エンジン制御装
置、及びエンジン制御などのセンサ信号をコントロール
ユニットに取り込むためのセンサ信号検出回路とその回
路ユニットに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine control device, a sensor signal detection circuit for capturing a sensor signal for engine control and the like into a control unit, and a circuit unit thereof.
【０００２】[0002]
【従来の技術】自動車用のエンジン制御に用いる各種セ
ンサのうち、例えば排気ガス中の酸素濃度を検出するО
2センサについては、基準電圧設定手段にて設定された
基準電圧をバイアス点とし、そのバイアス点を中心にし
てセンサ信号を検出（取り込む）技術が提案されてい
る。2. Description of the Related Art Among various sensors used for controlling an engine for an automobile, for example, the oxygen concentration in exhaust gas is detected.
Regarding the two sensors, a technique has been proposed in which the reference voltage set by the reference voltage setting means is used as a bias point and the sensor signal is detected (captured) around the bias point.
【０００３】基準電圧の作り方としては、例えば、特開
平９−１２６０３９号公報に開示される信号処理回路で
は、ノック信号を積分する場合に、同一抵抗値の２つの
抵抗で電源電圧を２等分して作った電圧を積分の基準点
としていることが知られている。As a method of forming the reference voltage, for example, in the signal processing circuit disclosed in Japanese Patent Laid-Open No. 9-126039, when the knock signal is integrated, the power supply voltage is divided into two equal parts by two resistors having the same resistance value. It is known that the voltage created in this way is used as a reference point for integration.
【０００４】また、この設定した基準電圧は、センサが
断線した場合、特定の電圧にすることで、センサの断線
状態を判定するように、そのままフェールセーフ制御値
として使用し、各種アクチュエータを制御することもあ
る。Further, the set reference voltage is used as it is as a fail-safe control value so as to determine the disconnection state of the sensor by setting a specific voltage when the sensor is disconnected, and various actuators are controlled. Sometimes.
【０００５】センサ信号の検出において、センサと信号
検出回路の間、および検出回路からＣＰＵまでの間の信
号ラインは、ノイズの影響を受けやすい。In the detection of the sensor signal, the signal lines between the sensor and the signal detection circuit and between the detection circuit and the CPU are easily affected by noise.
【０００６】そのため、信号ラインの近傍はノイズ発生
源と離すようにしてパターン設計を行ったり、信号ライ
ンをアースパターンで囲む等の対策をとってパターン設
計するような対策をしている。この手法によればパター
ンレイアウトの制約が大きくなる。また、上記のような
対策のパターンレイアウト方法を行っても、根本的な対
策とはなりえず、ノイズ発生源から出されるノイズによ
って、センサ信号にノイズが混入し、ノイズが混入した
センサの信号を制御に用いることでエンジン制御におい
てエミッションを悪化させるような誤動作を引き起こす
おそれがある。For this reason, the pattern is designed such that the vicinity of the signal line is separated from the noise source, or the signal line is surrounded by a ground pattern. According to this method, the restrictions on the pattern layout are increased. Even if the pattern layout method of the above countermeasure is performed, it cannot be a fundamental countermeasure, and the noise emitted from the noise source causes noise to be mixed into the sensor signal and the signal of the sensor in which the noise is mixed. When is used for control, there is a risk of causing malfunction in engine control that worsens emissions.
【０００７】なお、センサ装置のノイズ対策としては、
その他に、例えば、特開平８−１８４４６２号公報に開
示されるように、高周波ノイズ対策を施すために、オペ
アンプの出力に対して抵抗，コンデンサによるフィルタ
回路を形成したりする技術などが知られている。As a measure against noise of the sensor device,
In addition, for example, as disclosed in Japanese Patent Laid-Open No. 8-184462, there is known a technique of forming a filter circuit with a resistor and a capacitor for the output of an operational amplifier in order to take measures against high frequency noise. There is.
【０００８】[0008]
【発明が解決しようとする課題】自動車用のコントロー
ルユニットは、回路基板に発振回路とセンサ信号の検出
回路とを一緒に搭載しているが、ユニットの小型化およ
び回路の集約化が要求され実装面積を減少させなければ
ならない状況においては、ノイズ発生源となる発振回路
とセンサ信号の検出回路との実装位置を常に考慮しなけ
ればならず、パターンレイアウトの際の制限が大きく、
実際考慮したとしても、ノイズ発生源からの影響を受け
ることがあった。また、フィルタ回路を設けたとして
も、ノイズ発生源からの影響を受けることがあった。In a control unit for an automobile, an oscillation circuit and a detection circuit for sensor signals are mounted together on a circuit board, but it is required to reduce the size of the unit and integrate the circuits. In a situation where the area needs to be reduced, the mounting positions of the oscillation circuit that is the noise source and the detection circuit of the sensor signal must always be considered, and the restrictions in pattern layout are large.
Even when actually taken into consideration, it was sometimes affected by the noise source. Even if a filter circuit is provided, it may be affected by the noise source.
【０００９】特にＯ2センサの信号検出（信号取り込
み）は、センサ信号がリッチ，リーンを周期的に繰り返
す正弦波信号であり、このセンサ信号を直流バイアス点
を基準にして取り出すが、パターンレイアウトにより、
周辺にクリスタル等の発振回路がある場合、直流バイア
ス点が発振回路等のノイズ源の影響でノイズが混入し、
センサ信号がこのノイズの影響を受けことがある。In particular, the signal detection (signal acquisition) of the O 2 sensor is a sine wave signal in which the sensor signal periodically repeats rich and lean, and this sensor signal is taken out with reference to the DC bias point, but depending on the pattern layout. ,
If there is an oscillation circuit such as a crystal in the vicinity, noise will be mixed in at the DC bias point due to the noise source such as the oscillation circuit,
The sensor signal can be affected by this noise.
【００１０】また、Ｏ2センサの場合、センサ信号に発
振回路からのノイズが混入された信号が特定の周期性を
もっている場合には、センサの劣化特性の信号と酷似し
ているため、正常な信号なのか、もしくはノイズによる
影響を受けた信号なのかの判断がコントロールユニット
側では容易につかない。その結果ノイズが混入した信号
で、アクチュエータを制御するため最終的にエミッショ
ンの悪化するおそれがあった。Further, in the case of the O 2 sensor, when the signal in which the noise from the oscillation circuit is mixed in the sensor signal has a specific periodicity, it is very similar to the signal of the deterioration characteristic of the sensor, and thus it is normal. The control unit cannot easily determine whether the signal is a signal or a signal affected by noise. As a result, there is a possibility that the emission may be finally deteriorated because the actuator is controlled by the signal mixed with noise.
【００１１】本発明の目的は、パターンレイアウトに制
約されない自由な配置が行えると共に、センサの信号検
出において、センサ信号を検出するための基準電圧にノ
イズ発生源からノイズが混入するのを低減または防止す
ることができる自動車用のセンサ信号検出回路を提供す
ることにある。An object of the present invention is to allow free placement without being restricted by the pattern layout, and to reduce or prevent noise from being mixed into a reference voltage for detecting a sensor signal from a noise source in detecting a signal of the sensor. It is an object of the present invention to provide a sensor signal detection circuit for an automobile, which can perform
【００１２】[0012]
【課題を解決するための手段】本発明は、上記目的を達
成するために基本的には、自動車の制御に用いるセンサ
信号を、基準電圧設定手段により設定した電圧を基準点
にして検出する自動車用のセンサ信号検出回路におい
て、前記基準電圧設定手段にノイズ除去用のコンデンサ
を設けたことを特徴とする。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is basically an automobile for detecting a sensor signal used for controlling an automobile with a voltage set by a reference voltage setting means as a reference point. In the sensor signal detection circuit for use in the device, the reference voltage setting means is provided with a capacitor for removing noise.
【００１３】その最適例として、前記センサ信号が正弦
波の信号（例えば、О2信号）であり、この正弦波信号
を前記基準電圧設定手段により設定した基準電圧を直流
バイアス点として検出し、この直流バイアス点にノイズ
除去用のコンデンサを接続してなるものを提案する。As an optimum example thereof, the sensor signal is a sine wave signal (for example, an O 2 signal), and the sine wave signal is detected as a DC bias point by a reference voltage set by the reference voltage setting means. We propose to connect a capacitor for noise removal to the DC bias point.
【００１４】このように基準電圧を設定する基準電圧設
定手段の直流バイアス点にコンデンサを追加すること
で、ノイズ源から発生するノイズに対して低減又は削除
ができ、エンジンのエミッション悪化を防ぐことができ
る。By adding a capacitor to the DC bias point of the reference voltage setting means for setting the reference voltage in this way, noise generated from the noise source can be reduced or eliminated and deterioration of engine emissions can be prevented. it can.
【００１５】また、上記のようにコンデンサを追加する
ことで、ノイズ発生源からのノイズによる影響を受けな
くて済み、かつ発振回路等のノイズ源のパターンレイア
ウトを考慮せず、自由にパターン配置が行うことができ
る。Further, by adding the capacitor as described above, it is not necessary to be influenced by the noise from the noise generating source, and the pattern layout can be freely set without considering the pattern layout of the noise source such as the oscillation circuit. It can be carried out.
【００１６】[0016]
【発明の実施の形態】以下、本発明の実施例を図面に基
づき説明する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.
【００１７】図１は本発明の一実施例に係るセンサ信号
検出回路の構成図であり、代表例としてＯ2センサの信
号検出回路を示す。FIG. 1 is a block diagram of a sensor signal detection circuit according to an embodiment of the present invention, showing a signal detection circuit of an O 2 sensor as a typical example.
【００１８】Ｏ2センサ１は、内燃機関の排気ガス中の
酸素濃度を検出するもので、このセンサ信号は、コント
ロールユニット２０により実行されるエンジンの空燃比
制御に用いられる。The O 2 sensor 1 detects the oxygen concentration in the exhaust gas of the internal combustion engine, and this sensor signal is used for the engine air-fuel ratio control executed by the control unit 20.
【００１９】コントロールユニット２０は、図４に示す
ように、種々のエンジン状態に関するセンサ信号を入力
してエンジン制御を行うものであり、ここでは、一例と
して、ユニット２０内に設けたＯ2信号検出回路１０を
代表的に示している。As shown in FIG. 4, the control unit 20 inputs sensor signals relating to various engine states to perform engine control. Here, as an example, the O 2 signal detection provided in the unit 20 is detected. The circuit 10 is shown as a representative.
【００２０】検出回路１０の中の基準電圧設定手段９
は、分割した第１、第２の抵抗４、５よりなり、コント
ロールユニット２０内で使用している電源電圧７を第１
の抵抗４と第２の抵抗５で分割することにより、信号検
出用の基準となる電圧を設定する。Reference voltage setting means 9 in the detection circuit 10
Is composed of divided first and second resistors 4 and 5, and the power supply voltage 7 used in the control unit 20 is
The reference voltage for signal detection is set by dividing the resistor 4 and the second resistor 5.
【００２１】基準電圧設定手段９のバイアス点８は、Ｏ
2センサ１の信号線１１に抵抗１２を介して接続され
る。The bias point 8 of the reference voltage setting means 9 is O
2 The signal line 11 of the sensor 1 is connected via the resistor 12.
【００２２】Ｏ2センサ１の出力信号（ＶＰＰ１：約０
〜１Ｖ）は、コントロールユニット２０に入力した後
に、基準電圧設定手段９で設定された基準電圧（バイア
ス電圧）が加わることで、この基準電圧を中心に検出さ
れ、抵抗１３およびコンデンサ１４よりなるフィルタ回
路およびＡ／Ｄコンバータ３を介して、演算器（ＣＰ
Ｕ）２に入力される。Output signal of O 2 sensor 1 (VPP1: about 0
.About.1 V) is input to the control unit 20 and then the reference voltage (bias voltage) set by the reference voltage setting means 9 is applied, so that the reference voltage is detected as the center, and the filter including the resistor 13 and the capacitor 14 is applied. Via the circuit and the A / D converter 3, an arithmetic unit (CP
U) 2 is input.
【００２３】ＣＰＵ２では、図４に示すように、Ａ／Ｄ
コンバータ３へ入力されたＯ2センサ１その他の各種セ
ンサ信号の入力に応じてインジェクタ等のアクチュエー
タを動作させる。In the CPU 2, as shown in FIG.
An actuator such as an injector is operated in response to the input of the O 2 sensor 1 and other various sensor signals input to the converter 3.
【００２４】また、バイアス点８で設定された基準電圧
は、Ｏ2センサ１が断線した場合には、図３（ｄ）に示
すように固定の電圧に設定していることで、センサ断線
時のフェールセーフ制御値として用いている。When the O 2 sensor 1 is disconnected, the reference voltage set at the bias point 8 is set to a fixed voltage as shown in FIG. It is used as the fail-safe control value of.
【００２５】Ｏ2センサの信号検出手段（検出回路）１
０は、実際に基板１００上へ他の回路と共にパターンレ
イアウトを行う際、例えばクリスタルで構成される発振
回路１０１とＯ2センサ検出回路１０とを配置する場合
には、発振回路１０１がノイズ源となるために、従来
は、図２に示すように、両者の回路を一定の間隔１０３
を十分に離すなどしていたが、パターン設計時において
回路配置が自由に行えなくなるといった大きな制約がで
てきてしまう。Signal detection means (detection circuit) 1 of O 2 sensor
0 indicates that when the pattern layout is actually performed on the substrate 100 together with other circuits, for example, when the oscillation circuit 101 composed of a crystal and the O 2 sensor detection circuit 10 are arranged, the oscillation circuit 101 acts as a noise source. Therefore, conventionally, as shown in FIG.
However, there is a big restriction that the circuit layout cannot be freely performed at the time of pattern design.
【００２６】また、上記パターンレイアウトによる対応
を行ったとしても、発振回路１０１からのクロックノイ
ズがＯ2センサ検出手段１０への混入が懸念される。Even if the above pattern layout is used, there is a concern that clock noise from the oscillation circuit 101 may be mixed into the O 2 sensor detecting means 10.
【００２７】正常なＯ2センサ１の信号は、図３（ａ）
に示すように、バイアス点８では基準電圧を中心に、Ｖ
ＰＰ１（約０〜１Ｖ）の範囲で周期をもった正弦波信号
で振幅し検出され、ＣＰＵ２のＡ／Ｄコンバータ３へ入
力する。基準電圧よりも正側は、空燃比はリッチ混合
気、負側はリーン混合気の状態を示す。The signal of the normal O 2 sensor 1 is shown in FIG.
As shown in FIG.
The sine wave signal having a period in the range of PP1 (about 0 to 1 V) is detected as the amplitude and is input to the A / D converter 3 of the CPU 2. The air-fuel ratio on the positive side of the reference voltage is rich, and on the negative side, the lean air-fuel ratio is lean.
【００２８】図３（ｂ）に、本実施例のようなコンデン
サ６をバイアス点８に接続しない場合において、Ｏ2セ
ンサ検出回路１０で検出したセンサ信号に、ノイズ源と
なる発振回路１０１からＯ2センサ検出回路１０の基準
電圧手段９のバイアス点８へノイズが混入したときの、
バイアス点８での影響されたセンサ信号の波形の例を示
す。In FIG. 3B, in the case where the capacitor 6 as in this embodiment is not connected to the bias point 8, the sensor signal detected by the O 2 sensor detection circuit 10 is output from the oscillation circuit 101 which becomes a noise source. 2 When noise is mixed in the bias point 8 of the reference voltage means 9 of the sensor detection circuit 10,
An example of the waveform of the affected sensor signal at bias point 8 is shown.
【００２９】すなわち、この場合には、パターンレイア
ウトを考慮した場合であっても、Ｏ 2センサ検出回路１
０が発振回路１０１の近傍にある場合には、この発振回
路１０１からのクロック信号がノイズとしてバイアス点
８からＯ2センサ信号に混入してしまい、図３（ｂ）の
ような信号になってしまう。この時のＯ2センサの信号
は、ＶＰＰ２（０〜２００ｍＶ）の範囲で振幅し、ま
た、周期が早くなる傾向にある。That is, in this case, the pattern layer
Even when considering the 2Sensor detection circuit 1
If 0 is near the oscillation circuit 101, this oscillation frequency
Clock signal from path 101 is biased as noise
8 to O2It is mixed in the sensor signal, and
It becomes such a signal. O at this time2Sensor signal
Oscillates in the range of VPP2 (0 to 200 mV),
Also, the cycle tends to be faster.
【００３０】このノイズが混入したセンサ信号は、Ｏ2
センサ１の劣化特性時の信号と酷似しているため、コン
トロールユニット２０のＣＰＵ２では、Ｏ2センサ１の
劣化特性と判断してエンジンを制御してしまい、最終的
にはエンジンのエミッションの悪化という問題が発生し
てしまう。The sensor signal mixed with this noise is O 2
Since the signal of the deterioration characteristic of the sensor 1 is very similar, the CPU 2 of the control unit 20 judges the deterioration characteristic of the O 2 sensor 1 to control the engine, and finally the emission of the engine deteriorates. There will be problems.
【００３１】本発明は図１に示すように、ノイズ除去用
のコンデンサ６を基準電圧設定手段９のバイアス点８に
追加することにより、ノイズ源となるような発振回路１
０１からのクロックノイズを削除もしくは減少させるこ
とができる。In the present invention, as shown in FIG. 1, by adding a noise removing capacitor 6 to the bias point 8 of the reference voltage setting means 9, an oscillation circuit 1 becomes a noise source.
The clock noise from 01 can be eliminated or reduced.
【００３２】基準電圧設定手段９のバイアス点８へコン
デンサ６追加後は、図３（ｃ）に示すようにノイズが低
減もしくは削除された信号波形となり、ノイズ混入によ
る影響によるエミッション悪化などの問題が解消され
る。After the capacitor 6 is added to the bias point 8 of the reference voltage setting means 9, a noise-reduced or deleted signal waveform is obtained as shown in FIG. Will be resolved.
【００３３】[0033]
【発明の効果】本発明によれば、基準電圧を設定し、基
準電圧を中心にセンサの信号の検出を行う検出回路にお
いて、基準電圧設定手段のバイアス点にコンデンサを追
加することにより発振回路等のノイズ源のパターンレイ
アウトに左右されることがなく、またノイズの混入を低
減もしくは削除ができる効果がある。According to the present invention, in a detection circuit for setting a reference voltage and detecting a sensor signal centered on the reference voltage, an oscillator circuit etc. is obtained by adding a capacitor to the bias point of the reference voltage setting means. There is an effect that it is not affected by the pattern layout of the noise source and that the mixing of noise can be reduced or eliminated.
【図１】本発明のＯ2センサ検出回路を示す図。FIG. 1 is a diagram showing an O 2 sensor detection circuit of the present invention.
【図２】センサ信号検出回路と発振回路との回路基板上
への実装配置を示す図。FIG. 2 is a diagram showing a mounting arrangement of a sensor signal detection circuit and an oscillation circuit on a circuit board.
【図３】Ｏ2センサ信号の種々の波形パターンを示す説
明図。FIG. 3 is an explanatory diagram showing various waveform patterns of an O 2 sensor signal.
【図４】上記実施例に係るエンジン制御装置の概略構成
を示す図である。FIG. 4 is a diagram showing a schematic configuration of an engine control device according to the embodiment.
１…Ｏ2センサ、２…ＣＰＵ、３…Ａ／Ｄ変換器、４、
５…抵抗、６…ノイズ除去用コンデンサ、７…電源電
圧、８…バイアス点、９…基準電圧設定手段、１０…セ
ンサ信号検出手段（センサ信号検出回路）、２０…コン
トロールユニット（ＥＣＵ）、１００…基板、１０１…
発振回路。1 ... O 2 sensor, 2 ... CPU, 3 ... A / D converter, 4,
5 ... Resistor, 6 ... Noise removing capacitor, 7 ... Power supply voltage, 8 ... Bias point, 9 ... Reference voltage setting means, 10 ... Sensor signal detecting means (sensor signal detecting circuit), 20 ... Control unit (ECU), 100 ... substrate, 101 ...
Oscillator circuit.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 小野 浩一 茨城県ひたちなか市高場2477番地 株式会 社日立カーエンジニアリング内 Ｆターム(参考） 3G084 DA04 DA20 DA27 EA01 EA08 EA11 EB22 FA02 FA20 FA25 FA29 FA38 3G301 HA01 JA09 JA20 JB01 JB09 NB05 NB07 PA10Z PC08Z PD02Z PE03Z PE08Z PG01Z ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Koichi Ono 2477 Takaba, Hitachinaka City, Ibaraki Prefecture Stock Association Inside Hitachi Car Engineering F term (reference) 3G084 DA04 DA20 DA27 EA01 EA08 EA11 EB22 FA02 FA20 FA25 FA29 FA38 3G301 HA01 JA09 JA20 JB01 JB09 NB05 NB07 PA10Z PC08Z PD02Z PE03Z PE08Z PG01Z
Claims (5)
準電圧設定手段により設定した電圧を基準点にして検出
する自動車用のセンサ信号検出回路において、 前記基準電圧設定手段にノイズ除去用のコンデンサを設
けたことを特徴とする自動車用のセンサ信号検出回路。1. A sensor signal detection circuit for an automobile, which detects a sensor signal used for controlling an automobile using a voltage set by a reference voltage setting means as a reference point, wherein a noise removing capacitor is provided in the reference voltage setting means. A sensor signal detection circuit for an automobile, which is provided.
前記センサ信号に前記基準電圧設定手段により設定した
基準電圧による直流バイアスを与えて、該センサ信号を
検出し、この直流バイアスを加えるバイアス点にノイズ
除去用のコンデンサが接続されている請求項１記載の自
動車用のセンサ信号検出回路。2. The sensor signal is a sinusoidal signal,
2. A capacitor for noise removal is connected to the bias point to which the sensor signal is detected by applying a DC bias to the sensor signal according to the reference voltage set by the reference voltage setting means and to which the DC signal is applied. Sensor signal detection circuit for automobile.
からの出力電圧をセンサ信号とし、前記基準電圧設定手
段は、複数の抵抗により分割される電源電圧を基準電圧
として設定し、この基準電圧を直流バイアスとして前記
Ｏ2センサの出力電圧に与えることで前記センサ信号を
検出し、この直流バイアスを加えるバイアス点にノイズ
除去用のコンデンサが接続されている請求項１記載の自
動車用センサ信号検出回路。3. An output voltage from an O 2 sensor provided in an exhaust pipe of an automobile is used as a sensor signal, and the reference voltage setting means sets a power supply voltage divided by a plurality of resistors as a reference voltage. The sensor signal detection according to claim 1, wherein the sensor signal is detected by applying a DC bias to the output voltage of the O 2 sensor, and a noise removing capacitor is connected to a bias point to which the DC bias is applied. circuit.
からの出力電圧に、基準電圧設定手段により設定した基
準電圧を直流バイアスとして加えることで、前記Ｏ2セ
ンサの信号を検出し、このセンサ信号に基づき空燃比制
御を行うエンジン制御装置において、 前記センサ信号よりＯ2センサの劣化特性を判断する手
段と、 前記直流バイアスを加えるバイアス点に接続されたノイ
ズ除去用のコンデンサと、を備えてなることを特徴とす
るエンジン制御装置。4. A signal of the O 2 sensor is detected by applying a reference voltage set by a reference voltage setting means as a DC bias to an output voltage from an O 2 sensor provided in an exhaust pipe of an automobile, and this sensor is detected. An engine control device for performing air-fuel ratio control based on a signal includes means for determining deterioration characteristics of an O 2 sensor from the sensor signal, and a noise removing capacitor connected to a bias point to which the DC bias is applied. An engine control device characterized by:
らの信号を入力し、このセンサ信号を検出する検出回路
と、発振回路と、を回路基板に搭載してなる回路ユニッ
トにおいて、 前記検出回路は、センサ信号を検出するための直流バイ
アス点を基準電圧により設定する基準電圧設定手段と、
前記直流バイアス点に接続されるノイズ除去用のコンデ
ンサと、を有していることを特徴とする回路ユニット。5. A circuit unit in which a detection circuit for inputting a signal from a sensor used for controlling an engine of an automobile and detecting the sensor signal and an oscillation circuit are mounted on a circuit board, wherein the detection circuit comprises: Reference voltage setting means for setting a DC bias point for detecting a sensor signal by a reference voltage,
And a noise removing capacitor connected to the DC bias point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001327455A JP4014844B2 (en) | 2001-10-25 | 2001-10-25 | Engine control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001327455A JP4014844B2 (en) | 2001-10-25 | 2001-10-25 | Engine control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003129894A true JP2003129894A (en) | 2003-05-08 |
| JP4014844B2 JP4014844B2 (en) | 2007-11-28 |
Family
ID=19143681
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001327455A Expired - Fee Related JP4014844B2 (en) | 2001-10-25 | 2001-10-25 | Engine control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4014844B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015053254A1 (en) * | 2013-10-07 | 2015-04-16 | 株式会社デンソー | Engine control device enabling avoidance of erroneous detection by sensor |
| JP7465223B2 (en) | 2021-01-22 | 2024-04-10 | 日立Astemo株式会社 | Substrate having oxygen concentration sensor signal input circuit and electronic control device equipped with same |
-
2001
- 2001-10-25 JP JP2001327455A patent/JP4014844B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015053254A1 (en) * | 2013-10-07 | 2015-04-16 | 株式会社デンソー | Engine control device enabling avoidance of erroneous detection by sensor |
| JP2015074991A (en) * | 2013-10-07 | 2015-04-20 | 株式会社デンソー | Engine control device |
| CN105612336A (en) * | 2013-10-07 | 2016-05-25 | 株式会社电装 | Engine control device enabling avoidance of erroneous detection by sensor |
| JP7465223B2 (en) | 2021-01-22 | 2024-04-10 | 日立Astemo株式会社 | Substrate having oxygen concentration sensor signal input circuit and electronic control device equipped with same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4014844B2 (en) | 2007-11-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7987661B2 (en) | Method for determining malfunction of nitrogen oxide sensor and selective catalytic reduction system operating the same | |
| JP3755646B2 (en) | O2 sensor failure diagnosis apparatus and method | |
| JPH0734936A (en) | Diagnostic device of engine system | |
| JP4094538B2 (en) | Air-fuel ratio sensor failure diagnosis device | |
| EP2199553A1 (en) | Failure detection apparatus for exhaust gas purifying filter | |
| WO2005108766A1 (en) | Abnormality detection device for internal combustion engine | |
| JP3623881B2 (en) | Abnormality diagnosis device for wide area air-fuel ratio sensor | |
| US10914220B2 (en) | Method, device, and system for operating a nitrogen oxide sensor | |
| JP2003129894A (en) | Sensor signal detection circuit for automobile, engine control unit and circuit unit | |
| KR20160070647A (en) | Failure Diagnosis Method for Oxygen Sensor, and Monitoring System for Exhaust Gas Operated Thereby | |
| JP2008231926A (en) | Exhaust emission control device of internal combustion engine | |
| JPH01109234A (en) | Deciding device for abnormality of knocking detecting device | |
| JP2004308466A (en) | False degradation signal generating circuit of oxygen concentration sensor and internal combustion engine controller equipped therewith | |
| JP2000292411A (en) | Gas concentration detector | |
| JP2000162173A (en) | Monitoring method of oxygen sensor | |
| KR20010070145A (en) | Plasma exhaust gas treatment apparatus | |
| JPH0783098A (en) | Abnormality diagnostic device for air-fuel ratio detection device | |
| JP2009167940A (en) | Exhaust emission control device of internal combustion engine | |
| JP2003329637A (en) | Current detector for gas sensor | |
| JP2004316570A (en) | False deterioration signal generating device for sensor | |
| KR100279417B1 (en) | Oxygen sensor failure diagnosis method | |
| JP2008057486A (en) | Exhaust emission control device of internal combustion engine | |
| JPH0933478A (en) | Apparatus for diagnosing response of oxygen sensor in internal combustion engine | |
| JP2006307750A (en) | Sensor controller | |
| JP2004308488A (en) | Pseudo deterioration signal generator of air-fuel ratio sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20061128 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20061130 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20070129 |
|
| RD02 | Notification of acceptance of power of attorney |
Free format text: JAPANESE INTERMEDIATE CODE: A7422 Effective date: 20070129 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20070306 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20070507 |
|
| A911 | Transfer to examiner for re-examination before appeal (zenchi) |
Free format text: JAPANESE INTERMEDIATE CODE: A911 Effective date: 20070620 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20070911 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20070912 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100921 Year of fee payment: 3 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 4014844 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100921 Year of fee payment: 3 |
|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313115 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100921 Year of fee payment: 3 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100921 Year of fee payment: 3 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110921 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120921 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120921 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130921 Year of fee payment: 6 |
|
| LAPS | Cancellation because of no payment of annual fees |