JPS6036976A - Position detecting circuit - Google Patents
Position detecting circuitInfo
- Publication number
- JPS6036976A JPS6036976A JP14505983A JP14505983A JPS6036976A JP S6036976 A JPS6036976 A JP S6036976A JP 14505983 A JP14505983 A JP 14505983A JP 14505983 A JP14505983 A JP 14505983A JP S6036976 A JPS6036976 A JP S6036976A
- Authority
- JP
- Japan
- Prior art keywords
- coil
- signal
- inductance value
- pulse
- output voltage
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
- G01D3/028—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure
- G01D3/036—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure on measuring arrangements themselves
- G01D3/0365—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure on measuring arrangements themselves the undesired influence being measured using a separate sensor, which produces an influence related signal
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/003—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring position, not involving coordinate determination
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
- G01D5/22—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature differentially influencing two coils
- G01D5/2208—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature differentially influencing two coils by influencing the self-induction of the coils
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は位置検出回路に関し、更に詳細に述べると、被
検出体の位置に応じたディジタル信号を取出しうるよう
にした位置検出回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a position detection circuit, and more particularly, to a position detection circuit capable of extracting a digital signal according to the position of a detected object.
一般に、被検出体の位置に応じた電気信号を出力するた
めに使用されている従来の位置検出回路は、例えば特開
昭５６−４６４０２号公報又は特開昭５６−６０３０４
号公報に開示されているように、θ「要の被検出体の位
置に応じてインダクタンスが変化する検出コイル及び該
検出コイルに直列に接続された基準コイルから成る回路
に正弦波発振器からの正弦波信号を印加しておき、検出
コイルの両端に生じる被検出体の位置に応じたレベルの
正弦波信号を直流電圧信号に変換し、該直流電圧信号が
位置検出電圧として出力される構成となっている。しか
しながら、近年広く用いられてきているマイクロプロセ
ッサを用いた制御系にあっては、この種の位置検出回路
を用いようとする場合には、直流電圧信号を一旦ディジ
タル信号に変換するためのＡ／Ｄ変換器を設ける必要が
生じ、位置検出回路の構成が複雑且つ高価となる問題点
を有している。In general, conventional position detection circuits used to output electrical signals according to the position of a detected object are disclosed in, for example, Japanese Patent Laid-Open No. 56-46402 or Japanese Patent Laid-Open No. 56-60304.
As disclosed in the publication, θ is a circuit consisting of a detection coil whose inductance changes depending on the position of the object to be detected, and a reference coil connected in series to the detection coil. A wave signal is applied, and the sine wave signal generated at both ends of the detection coil with a level corresponding to the position of the detected object is converted into a DC voltage signal, and the DC voltage signal is output as a position detection voltage. However, in control systems using microprocessors that have been widely used in recent years, when using this type of position detection circuit, it is necessary to first convert the DC voltage signal into a digital signal. It becomes necessary to provide an A/D converter, which poses a problem that the configuration of the position detection circuit becomes complicated and expensive.
更に、従来の位置検出回路では、温度等の変化によシ出
力直流電圧のレベルが変化しやすいため、検出精度が低
いという欠点も有している。Furthermore, conventional position detection circuits have the disadvantage of low detection accuracy because the level of the output DC voltage is likely to change due to changes in temperature or the like.
本発明の目的は、従って、位置検出結果を直接ディジタ
ル信号として得ることができる上に検出精度が高く、シ
かも構成が簡単な位置検出回路を提供することにある。Therefore, an object of the present invention is to provide a position detection circuit which can directly obtain a position detection result as a digital signal, has high detection accuracy, and has a simple configuration.
本発明の構成は、パルス信号を出力する手段と、被検出
体の位置に応じてインダクタンスが変化する検出コイル
及び該検出コイルと直列に接続された抵抗器を含んで成
シ上記パルス信号に応答して検出コイルのその時々のイ
ンダクタンス値に応じた第１パルス応答出力信号を出力
する手段と、所定の一定インダクタンスを有する基準コ
イル及び該基準コイルと直列に接続された直列抵抗器を
含んで成シ上記パルス信号に応答して基準コイルのイン
ダクタンス値に応じた第２パルス応答出力信号を出力す
る手段と、第１パルス応答出力信号及びパル？信号に応
答して検出コイルのインダクタンス値に応じた第１デイ
ジタル信号を出力する手段と、第２パルス応答出力信号
及びパルス信号に応答して基準コイルのインダクタンス
値に応じた第２デイジタル信号を出力する手段と、第１
デイジタル信号と第２デイジタル信号との比を演算する
演算手段とを有し、該演算手段からのディジタル出力を
位置データとして利用し得るようにした点に特徴を有す
る。The configuration of the present invention includes means for outputting a pulse signal, a detection coil whose inductance changes depending on the position of the detected object, and a resistor connected in series with the detection coil. means for outputting a first pulse response output signal according to the current inductance value of the detection coil; a reference coil having a predetermined constant inductance; and a series resistor connected in series with the reference coil. means for outputting a second pulse response output signal corresponding to the inductance value of the reference coil in response to the pulse signal; means for outputting a first digital signal corresponding to the inductance value of the detection coil in response to the signal; and a second pulse response output signal and a means for outputting a second digital signal corresponding to the inductance value of the reference coil in response to the pulse signal. and the means to
The present invention is characterized in that it has a calculation means for calculating the ratio between the digital signal and the second digital signal, and the digital output from the calculation means can be used as position data.
第１デイジタル信号は、パルス信号の立上り時点から、
第１パルス応答出力信号が所定レベルに達する時点まで
の時間を示す信号とすることができ、その信号発生器は
カウンタ用ＩＣｋ用いて構成することができる。第２デ
イジタル信号も、同様にして、パルス信号の立上シ時点
から第２パルス応答出力信号が所定レベルに達する時点
までの時間を示す信号とすることができ、カウンタ用Ｉ
Ｃを用いてその信号発生器を構成することができる。The first digital signal starts from the rising edge of the pulse signal.
The signal can be a signal indicating the time until the first pulse response output signal reaches a predetermined level, and its signal generator can be configured using a counter ICk. Similarly, the second digital signal can be a signal indicating the time from the rising edge of the pulse signal to the point in time when the second pulse response output signal reaches a predetermined level.
The signal generator can be constructed using C.
上述の構成によれば、位置信号を直接ディジタル信号と
して得ることができるほか、検出コイルのインダクタン
スの変化に基づく第１デイジタル信号と、所定のインダ
クタンス値の基準コイルに基づく第２デイジタル信号と
の比をとっているので、温度変化によるインダクタンス
の変化分がキャンセルされ、より精度の高い位置検出デ
ータを得ることができる。According to the above configuration, in addition to being able to directly obtain a position signal as a digital signal, the ratio between the first digital signal based on a change in the inductance of the detection coil and the second digital signal based on a reference coil having a predetermined inductance value can be obtained. Therefore, the change in inductance due to temperature change is canceled, and more accurate position detection data can be obtained.
以下、図示の実施例により本発明の詳細な説明する。Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.
第１図には、本発明による位置検出回路の一実施例が示
されている。位置検出回路１は、被検出体２の位置を示
す電気信号をディジタル信号の形態で得るための回路で
あシ、被検出体２の位置に応じてそのインダクタンス値
Ｌａが変化する検出コイル３と、被検出体２の位置に拘
らず所定の一定インダクタンス値ＬＯにセットされた基
準コイル４とを備えている。FIG. 1 shows an embodiment of a position detection circuit according to the present invention. The position detection circuit 1 is a circuit for obtaining an electrical signal indicating the position of the detected object 2 in the form of a digital signal, and includes a detection coil 3 whose inductance value La changes depending on the position of the detected object 2. , and a reference coil 4 set to a predetermined constant inductance value LO regardless of the position of the detected object 2.
検出コイル３の一端はパルス発生器５の出力線５ａに接
続され、検出コイル３の他端は抵抗器６を介してアース
されている。検出コイル３及び抵抗器６から成る第１応
答電圧発生回路７は、パルス発生器５から出力される繰
返しパルス信号Ｐ（第２図（ａＪ参照）に応答し、抵抗
器６０両端に、検出コイル３のインダクタンス値に応じ
て立上り特性の変化する第１出力電圧Ｖｌが発生する。One end of the detection coil 3 is connected to the output line 5a of the pulse generator 5, and the other end of the detection coil 3 is grounded via a resistor 6. A first response voltage generation circuit 7 consisting of a detection coil 3 and a resistor 6 responds to a repetitive pulse signal P (see FIG. 2 (aJ)) output from the pulse generator 5, and a detection coil A first output voltage Vl whose rise characteristic changes depending on the inductance value of 3 is generated.
第１出力電圧ｖ１は、第２図（ｂ）に示きれるように、
繰返しパルス信号Ｐの立上９に応答してそのレベルが上
昇し、且つその立下シに応答してそのレベルが下降する
ことを繰返すパルス応答′亀圧信号であり、第１出力電
圧Ｖ１の上昇及び下降特性は検出コイル３のインダクタ
ンスＬａＯ値と抵抗器６の抵抗値とに基づく時定数に依
存するものである。The first output voltage v1 is, as shown in FIG. 2(b),
This is a pulse response 'torque pressure signal' in which the level repeatedly increases in response to the rising edge of the pulse signal P and decreases in response to the falling edge of the pulse signal P. The rising and falling characteristics depend on a time constant based on the inductance LaO value of the detection coil 3 and the resistance value of the resistor 6.
ここでは、抵抗器６の抵抗値は一定であるので、第１出
力電圧Ｖ、の上昇及び下降特性は検出コイル３のインダ
クタンス値に応じて、即ち被検出体２の位置に応じて変
化することになる。Here, since the resistance value of the resistor 6 is constant, the rise and fall characteristics of the first output voltage V vary according to the inductance value of the detection coil 3, that is, according to the position of the detected object 2. become.
第１出力電圧ＶＩのレベルが所定の基準電圧レベルを越
えたか否かを検出する目的で、第１出力電圧Ｖ、は、そ
の−入力端子に基準電圧Ｖｏが印加されている電圧比較
器８の十入力端子に印加されている。従って、電圧比較
器８の出力電圧Ｖ。For the purpose of detecting whether the level of the first output voltage VI exceeds a predetermined reference voltage level, the first output voltage V, 10 is applied to the input terminal. Therefore, the output voltage V of the voltage comparator 8.
のレベルは、Ｖｏ ≧Ｖ、の場合にはほぼアースレベル
となってお、ｏ、Ｖｏ＜ ｖ、の場合にはほぼ電源電圧
レベルにまで上昇することになる。基準電圧Ｖ。のレベ
ルが第２図（ｂ）において一点鎖線で示されておシ、従
って、この場合、出力電圧ｖ２のレベルは第２図（Ｃ〕
に示されるように変化することになる。すでに述べたよ
うに、第１出力電圧Ｖ、のレベル上昇特性は検出コイル
３のインダクタンスに従って変化するので、パルス信号
Ｐが立上った時刻ｔ１からＶ、＝ Ｖｏとなる時刻ｔ２
までの時間Ｔａ、換言すれば、パルス信号Ｐが立上って
から出力′ｒニ圧Ｖ２が立上るまでの時間Ｔａは、検出
コイル３のインダクタンス値に従って変化することとな
る。即ち、時間Ｔａは被検出体２の位置に関連して変化
することになる。When Vo≧V, the level becomes almost the ground level, and when o, Vo<v, it rises to almost the power supply voltage level. Reference voltage V. The level of the output voltage v2 is indicated by the dashed line in FIG. 2(b). Therefore, in this case, the level of the output voltage v2 is
will change as shown in . As already mentioned, the level increase characteristic of the first output voltage V changes according to the inductance of the detection coil 3, so from time t1 when the pulse signal P rises to time t2 when V, = Vo.
In other words, the time Ta from when the pulse signal P rises to when the output 'r' pressure V2 rises varies according to the inductance value of the detection coil 3. That is, the time Ta changes in relation to the position of the detected object 2.
この時間Ｔａを示すディジタルデータを得る目的で、第
１カウンタ９が設けられており、第１カウンタ９には、
クロック発生器１０からのクロックパルス信号ＣＫが印
加されると共に、パルス信号Ｐ及び出力電圧ｖ２が、夫
々、カウントスタート信号及びカウントストップ信号と
して印加されている。この結果、第１カウンタ９からは
、時間ＩＰａの大きさを示すディジタルデータｌｅａが
出力される。A first counter 9 is provided for the purpose of obtaining digital data indicating this time Ta, and the first counter 9 includes:
A clock pulse signal CK from a clock generator 10 is applied, and a pulse signal P and an output voltage v2 are applied as a count start signal and a count stop signal, respectively. As a result, the first counter 9 outputs digital data lea indicating the magnitude of the time IPa.
一方、基準コイル４は、抵抗器１１と直列に接続されて
第２応答電圧発生回路１２を構成してお、ｂ、ｘｉ応答
電圧発生回路７と同様に、パルス信号Ｐに応答して、基
準コイル４のインダクタンス値Ｌｏに応じた立上シ特性
の第２出力電圧ｖ３を出力する。（第２図（ｄ）参照）
。On the other hand, the reference coil 4 is connected in series with the resistor 11 to constitute a second response voltage generation circuit 12, and similarly to the b, xi response voltage generation circuit 7, the reference coil 4 responds to the pulse signal P to generate the reference voltage. A second output voltage v3 having a rising characteristic corresponding to the inductance value Lo of the coil 4 is output. (See Figure 2(d))
.
第２出力電圧ｖ３のレベルがＰＪｉ定の基準レベルを越
えたか否かを検出する目的で、その−入力端子に基準電
圧Ｖ。が印加されており、その十入力端子には第２出力
電圧Ｖ３が印加されている電圧比較器１３が設けられて
いる。電圧比較器１３の出力′電圧ｖ４のレベルは、Ｖ
ｏ≧Ｖ３の場合にはほぼアース電位となっておシ、Ｖｏ
＜Ｖ３ の場合にはほぼ電源電圧レベルにまで上昇する
ことになる。基準電圧Ｖ。のレベルが第２図（ｄ）にお
いて一点鎖線で示されておシ、従って、この場合、出力
′電圧ｖ４のレベルは第２図（ｅ）に示されるように変
化することになる。すでに述べたように、第２出力電圧
ｖ３のレベル上昇特性は基準コイル４のインダクタンス
値に依存しているので、パルス信号Ｐが立上った時刻ｔ
１から、第２出力電圧Ｖ３のレベルがＶ。と等しくなる
時刻ｔ３までの時間Ｔ。、換言すれば、パルス信号Ｐが
立上ってから出力電圧Ｖ４が立上る寸での時間Ｔ。は、
基準コイル４のインダクタンス値に依存する。For the purpose of detecting whether the level of the second output voltage v3 exceeds the reference level of PJi, a reference voltage V is applied to the - input terminal thereof. is applied thereto, and a voltage comparator 13 is provided to its ten input terminals to which a second output voltage V3 is applied. The level of the output voltage v4 of the voltage comparator 13 is V
In the case of o≧V3, it becomes almost the ground potential, and Vo
<V3, the voltage rises almost to the power supply voltage level. Reference voltage V. The level of the output voltage v4 is shown by the dashed line in FIG. 2(d). Therefore, in this case, the level of the output voltage v4 changes as shown in FIG. 2(e). As already mentioned, the level increase characteristic of the second output voltage v3 depends on the inductance value of the reference coil 4, so the time t when the pulse signal P rises
1, the level of the second output voltage V3 is V. The time T until time t3 becomes equal to . In other words, the time T from when the pulse signal P rises until the output voltage V4 rises. teeth,
It depends on the inductance value of the reference coil 4.
この時間Ｔ。を示すディジタルデータを得る目的で、第
２カウンタ１４が設けられておシ、第２カウンタ１４に
は、クロック発生器１０からのクロックパルス信号ＣＫ
が印加されると共に、パルス信号Ｐ及び出力電圧Ｖ４が
、夫々、カウントスタート信号及びカウントストップ信
号として印加されている。この結果、第２カウンタ１４
からは、時間Ｔ。の大きさを示すディジタルデータＤ。This time T. A second counter 14 is provided for the purpose of obtaining digital data indicative of the clock pulse signal CK from the clock generator 10.
is applied, and a pulse signal P and output voltage V4 are applied as a count start signal and a count stop signal, respectively. As a result, the second counter 14
From now on, time T. Digital data D indicating the size of.
が出力される。基準コイル４は、半固定のインダクタン
スであシ、従ってＴｏの値は被検出体２の位置変化に拘
らず一定であるが、温度変化又はパルス信号Ｐの波高値
の変化によってＴ。の値は影響を受けるものである。温
度変化及びパルス信号Ｐの波高値の変化による彫物は、
時間Ｔａの長さにも同様に影響を与える。これらの影響
を除去するため、データＤａ、Ｄｏは例えばＣＰＵｌ５
及びメモリ１６を備えてなるデータ処理装置１７に入力
され、ここでＴａ／Ｔｏの演算がデータＤａ、ＤＯに基
づいて実行され、その結果得られたデータＤｏｕｔが被
検出体２の位置を示すデータとして出力される。is output. The reference coil 4 has a semi-fixed inductance, so the value of To is constant regardless of changes in the position of the detected object 2, but T changes due to temperature changes or changes in the peak value of the pulse signal P. The value of is what is affected. Carvings due to temperature changes and changes in the peak value of the pulse signal P are
The length of time Ta is similarly affected. In order to remove these influences, data Da and Do are processed by CPU15, for example.
and a memory 16, where the calculation of Ta/To is executed based on the data Da and DO, and the data Dout obtained as a result is data indicating the position of the detected object 2. is output as
このように、基準コイルを用いたことによりイ↓ｆられ
るデータＤ、を利用してＴ ａ ／ ’１” ｎの演算
を行なうことによシ、温度変化及びパルス信号Ｐのレベ
ル変化に起因する位置検出データの誤差を除去できるの
で、極めて精度の高い位置検出が可能となる。In this way, by performing the calculation of T a /'1''n using the data D, which is ↓f by using the reference coil, it is possible to calculate Since errors in position detection data can be removed, extremely highly accurate position detection is possible.
また、このような構成によれば、位置検出回路自体の調
整は、抵抗器６，１１を可変素子とすることによシ容易
に実現可能であり、従って、この位置検出回路を内燃機
関用燃料噴射ポンプの燃料ｎ節部材の位置検出に用いる
場合、この回路全体又は一部をポンプに内蔵することに
ょシ、抵抗器６．１１を調節して、噴射量のトリミング
を行なうことが可能となる。Further, according to such a configuration, the adjustment of the position detection circuit itself can be easily realized by using the resistors 6 and 11 as variable elements, and therefore, this position detection circuit can be easily adjusted when using the internal combustion engine fuel. When used to detect the position of the fuel n-node member of an injection pump, by incorporating this circuit in whole or in part into the pump, it becomes possible to trim the injection amount by adjusting the resistor 6.11. .
上述の構成によれば、被検出体の位置を示す位置信号を
ディジタルデータとして直接出方することができるので
、本発明による位置検出回路を電子制御式燃料噴射ポン
プの燃料調節部材位置検出用として用いた場合、データ
Ｄｏｕｔをそのままフィードバック信号として用いて、
コンビーータに入力することができるので、頗る便利で
ある。According to the above configuration, the position signal indicating the position of the detected object can be directly output as digital data, so the position detection circuit according to the present invention can be used for detecting the position of the fuel adjustment member of an electronically controlled fuel injection pump. When used, the data Dout is directly used as a feedback signal,
It is very convenient because it can be input into the converter.
本発明によれば、上述の如く、複雑な構成を用いること
なく、位置信号をディジタル信号として直接出力するこ
とができるので、マイクロプロセッサを用いた制御系に
使用する場合にＡ／Ｄ変換器が不要となシ、回路を安価
に構成することができるほか、発振器と検出コイルとの
間の配線の浮遊Ｗｆｌｃが問題とならないので、検出コ
イルとその他の回路とを離して配置する構成においても
何らの不都合を生じることがない。また、検出コイルの
外に基準コイルを設け、両コイルにより得られた２つの
出力データの比をとって、最終的な位置データとしたの
で、温度補正が可能となるほかに、各コイルに供給する
パルス信号の波高レベルの変化による誤差を除去するこ
とができ、極めて精度のよい位置検出を行なうことがで
きる。According to the present invention, as described above, a position signal can be directly output as a digital signal without using a complicated configuration, so when used in a control system using a microprocessor, an A/D converter can be used. In addition to eliminating unnecessary circuits, the circuit can be configured at a low cost, and stray Wflc in the wiring between the oscillator and the detection coil does not become a problem, so there is no need to worry about this even in configurations where the detection coil and other circuits are placed apart. This will not cause any inconvenience. In addition, a reference coil was installed outside the detection coil, and the ratio of the two output data obtained from both coils was taken to obtain the final position data. Errors caused by changes in the pulse height level of the pulse signal can be removed, and extremely accurate position detection can be performed.
第１図は本発明による位置検出回路の一実施例を示す回
路図、第２図（ａ）乃至第２図（ｅ）は第１図に示す回
路の各部の波形を示す波形図である。
１・・・位置検出回路、２・・・被検出体、３・・・検
出コイル、４・・・基準コイル、５・・・パルス発生器
、６．１１・・・抵抗器、７・・・第１応答電圧発生回
路、８．１３・・・電圧比較器、９・・・第１カウンタ
、１２・・・第２応答電圧発生回路、１４・・・第２カ
ウンタ、１７・・・データ処理装置、Ｐ・・・パルス信
号、Ｖｌ・・・第１出力電圧、■、・・・出力電圧、Ｖ
３・・・第２出力′晟圧、ｖ４・・・出力電圧、Ｄａ、
Ｄｏ ・・・ディジタルデータ、特許出願人 ヂーゼル
機器株式会社
代理人 弁理士 高 野 昌 俊FIG. 1 is a circuit diagram showing one embodiment of a position detection circuit according to the present invention, and FIGS. 2(a) to 2(e) are waveform diagrams showing waveforms of various parts of the circuit shown in FIG. 1. DESCRIPTION OF SYMBOLS 1...Position detection circuit, 2...Detected object, 3...Detection coil, 4...Reference coil, 5...Pulse generator, 6.11...Resistor, 7...・First response voltage generation circuit, 8.13... Voltage comparator, 9... First counter, 12... Second response voltage generation circuit, 14... Second counter, 17... Data Processing device, P...pulse signal, Vl...first output voltage, ■,...output voltage, V
3...Second output 'temperature pressure, v4...Output voltage, Da,
Do...Digital data, patent applicant: Diesel Kiki Co., Ltd. Agent Patent attorney: Masatoshi Takano
Claims (1)
応じてインダクタンスが変化する検出コイル及び該検出
コイルと直列に接続された抵抗器を含んで成シ前記パル
ス信号に応答して検出コイルのその時々のインダクタン
ス値に応じた第１パルス応答出力信号を出方する手段と
、所定の一定インダクタンスの基準コイル及び該基準コ
イルと直列に接続された直列抵抗器を含んで成シ前記パ
ルス信号に応答して前記基準コイルのインダクタンス値
に応じた第２パルス応答出カ信号を出力する手段と、前
記第１パルス応答出方信号及び前記パルス信号に応答し
て前記検出コイルのインダクタンス値に応じた第１デイ
ジタル信号を出力する手段と、前記第２パルス応答出力
信号及び前記パルス信号に応答して前記基準コイルのイ
ンダクタンス値に応じた第２デイジタル信号を出方する
手段と、前記第１デイジタル信号と前記第２デイジタル
信号との比を演算する演算手段とを有し、該演算手段か
らのディジタル出力を位置データとして利用し得るよう
に構成したことを特徴とする位置検出回路。1. The detection coil includes a means for outputting a pulse signal, a detection coil whose inductance changes depending on the position of the detected object, and a resistor connected in series with the detection coil. a reference coil having a predetermined constant inductance and a series resistor connected in series with the reference coil; means for outputting a second pulse response output signal according to the inductance value of the reference coil in response to the first pulse response output signal and the pulse signal, and according to the inductance value of the detection coil in response to the first pulse response output signal and the pulse signal. means for outputting a first digital signal corresponding to the inductance value of the reference coil in response to the second pulse response output signal and the pulse signal; What is claimed is: 1. A position detection circuit comprising: arithmetic means for calculating a ratio between a signal and the second digital signal, and configured such that a digital output from the arithmetic means can be used as position data.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14505983A JPS6036976A (en) | 1983-08-10 | 1983-08-10 | Position detecting circuit |
| US06/640,168 US4626621A (en) | 1983-08-10 | 1984-08-10 | Circuit for generating a position in digital form |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14505983A JPS6036976A (en) | 1983-08-10 | 1983-08-10 | Position detecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6036976A true JPS6036976A (en) | 1985-02-26 |
Family
ID=15376423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14505983A Pending JPS6036976A (en) | 1983-08-10 | 1983-08-10 | Position detecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6036976A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0237171A2 (en) * | 1986-03-12 | 1987-09-16 | Eldec Corporation | Inductance divider sensor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4934621A (en) * | 1972-08-04 | 1974-03-30 | ||
| JPS5660304A (en) * | 1979-10-03 | 1981-05-25 | Bosch Gmbh Robert | Induction type measuring apparatus |
-
1983
- 1983-08-10 JP JP14505983A patent/JPS6036976A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4934621A (en) * | 1972-08-04 | 1974-03-30 | ||
| JPS5660304A (en) * | 1979-10-03 | 1981-05-25 | Bosch Gmbh Robert | Induction type measuring apparatus |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0237171A2 (en) * | 1986-03-12 | 1987-09-16 | Eldec Corporation | Inductance divider sensor |
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