JPS595962A - Speed detecting apparatus for automobile - Google Patents
Speed detecting apparatus for automobileInfo
- Publication number
- JPS595962A JPS595962A JP11582482A JP11582482A JPS595962A JP S595962 A JPS595962 A JP S595962A JP 11582482 A JP11582482 A JP 11582482A JP 11582482 A JP11582482 A JP 11582482A JP S595962 A JPS595962 A JP S595962A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- buffer
- reference signal
- speed
- output
- 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
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
- G01P3/487—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by rotating magnets
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Linear Or Angular Velocity Measurement And Their Indicating Devices (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は自動車の走行速度あるいはエンジン回転速度を
検出する自動車用速度検出装置、特に磁気抵抗素子セン
サを用いた速度検出装置の改良に−１−
係るものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an automobile speed detection device for detecting the running speed or engine rotation speed of an automobile, particularly a speed detection device using a magnetoresistive element sensor.
＝般に、自動車用速度検出装置として、磁気抵抗素子セ
ンサ、即ち磁束密度に応じて抵抗値が変化する磁気抵抗
素子をイｉ″ｒＪるレンジを用いて車速に比例した検出
信号を発生すると共に、該発生した検出信号に整形など
信号処１！！を施し所望の車速パルス信号を得るように
したものが知られている。Generally, as a speed detection device for an automobile, a magnetoresistive element sensor, that is, a magnetoresistive element whose resistance value changes depending on the magnetic flux density, is used to generate a detection signal proportional to the vehicle speed. It is known that the generated detection signal is subjected to signal processing such as shaping to obtain a desired vehicle speed pulse signal.
ところで車速情報はエンジンジントロールシステム、車
両走行システムなど電子制御システムや速度表示などの
各種分野に広く入力情報として使用されている。By the way, vehicle speed information is widely used as input information in various fields such as electronic control systems such as engine engine control systems and vehicle running systems, and speed displays.
しかし、従来の検出装置によれば、上記の如き信号処理
回路に入力される基準電性の設定が比較的難かしいと共
に、磁気抵抗素子の温度特性により検出信号自体に歪み
を生ずると非所望な車速パルス信号が１ｑられるなど種
々の問題が生じた。However, with conventional detection devices, it is relatively difficult to set the reference conductivity input to the signal processing circuit as described above, and the detection signal itself may be undesirably distorted due to the temperature characteristics of the magnetoresistive element. Various problems arose, such as the vehicle speed pulse signal being delayed by 1q.
本発明は上記問題点を解決することを目的とし、広速度
範囲および広温度範囲で安定な多パルス信号を得ること
を目的としている。そのため本発明の自動車用速度検出
装置は回転速度に比例した周一 ２ −
波数の検出信号を発生づる磁気抵抗素子センサと上記検
出信号を処理する信号処理回路とを備え、回転速度に比
例した′ａｖパルス信号を生成する自動車用速度検出装
置において、上記検出信号をインピーダンス変換するバ
ッファと、該バッフ７１１１力を平滑・平均化し基準信
号を出力する積分器と、該積分器による基準信号をもと
に上記バッファ出力を増幅づる増幅器と、該増幅器出力
と上記基準信号どを比較する比較器とを尚え、該比較器
から上記速度パルス信号が出力されるよう上記信号処理
回路を構成したことを特徴とする。以下図面を参照しつ
つ本発明を説明する。The present invention aims to solve the above-mentioned problems, and aims to obtain a stable multi-pulse signal over a wide speed range and a wide temperature range. Therefore, the speed detection device for an automobile according to the present invention includes a magnetoresistive element sensor that generates a detection signal with a wave number of 12 - 2 - waves proportional to the rotational speed, and a signal processing circuit that processes the detection signal. A speed detection device for an automobile that generates a pulse signal includes a buffer that converts the impedance of the detection signal, an integrator that smooths and averages the force of the buffer 7111 and outputs a reference signal, and a speed detection device that generates a pulse signal based on the reference signal from the integrator. The signal processing circuit further includes an amplifier for amplifying the buffer output, and a comparator for comparing the output of the amplifier with the reference signal, and the signal processing circuit is configured so that the speed pulse signal is output from the comparator. shall be. The present invention will be described below with reference to the drawings.
第１図は本発明による自動車用′ＩＡ度検出装置の一実
施例構成を示している。FIG. 1 shows the construction of an embodiment of the ``IA degree detection apparatus for automobiles according to the present invention.
第１図において、１は図示しないトランスミッションの
回転が伝達されるドライブキー、２は取付用ナラ１〜．
３はキー１の回転をロータ６に伝達づるシ１７フトであ
りロータ６とかしめ固定されたもの、４は軸受け、５は
ハウジング、６はロータであり外周に多数個例えば６０
個の歯を有する磁−３−
性体例えば軟鉄製の歯車からなるもの、７は磁気抵抗索
子センサであり、ロータ６と対向してプリント基板８に
取り付ＧＪられたもの、８は信号処理回路が設（１られ
たプリント基板を夫々表わしている。In FIG. 1, 1 is a drive key to which the rotation of a transmission (not shown) is transmitted; 2 is a mounting nut 1-.
3 is a shaft 17 that transmits the rotation of the key 1 to the rotor 6, and is fixed to the rotor 6 by caulking; 4 is a bearing; 5 is a housing; 6 is a rotor; there are many, for example 60
7 is a magnetoresistive cable sensor mounted on a printed circuit board 8 facing the rotor 6; 8 is a signal Each figure represents a printed circuit board on which a processing circuit is installed.
磁気抵抗素子はンザ７は、第２図に図示する如く、矢印
イ方向に着磁された磁石９に固着された基板１０上に、
２個の磁気抵抗索子１１．１２を図示の如ぎ配線状態で
取り付（プて構成される。ここで図示端子Ａ、Ｂ、Ｃは
それぞれ電源正極側、アース側、信号処理回路の入力端
子に接続される。As shown in FIG. 2, the magnetoresistive element 7 is mounted on a substrate 10 fixed to a magnet 9 magnetized in the direction of arrow A.
The two magnetoresistive cables 11 and 12 are installed in the wiring state as shown in the figure.The terminals A, B, and C shown in the figure are respectively connected to the positive side of the power supply, the ground side, and the input of the signal processing circuit. Connected to the terminal.
従って磁気抵抗素子ヒンザ７の電気等価回路は第３図の
如くなる。Therefore, the electrical equivalent circuit of the magnetic resistance element hinge 7 is as shown in FIG.
第４図は磁気抵抗素子センシフとロータ６との関係を説
明するための説明図を示している。FIG. 4 shows an explanatory diagram for explaining the relationship between the magnetoresistive element SENSIF and the rotor 6. As shown in FIG.
第４図において、矢印口方向に回転するロータ６の歯が
磁気抵抗素子センサ７に対して図示実線状態、即ち電源
側の磁気抵抗素子１１に最大接近した状態となると、該
磁気抵抗素子１１の抵抗値Ｒ１１が最大、他の磁気抵抗
素子１２の抵抗値Ｒ２２−４−
が最小となる。そしてロータ６の歯が図示破線状態、即
ら磁気抵抗素子１１と他の磁気抵抗素子１２との中間中
央位置に到達した状態においては、上記抵抗値Ｒｕ は
上記最大値と後述する最小値とを平均した平均値、上記
他の抵抗値ＲＨは上記最小値と後述する最大値とを平均
した平均値となる。In FIG. 4, when the teeth of the rotor 6 rotating in the direction of the arrow mark reach the state shown by the solid line with respect to the magnetoresistive element sensor 7, that is, the state where the teeth approach the magnetoresistive element 11 on the power supply side to the maximum, the magnetoresistive element 11 The resistance value R11 is the maximum, and the resistance value R22-4- of the other magnetoresistive elements 12 is the minimum. When the teeth of the rotor 6 are in the state indicated by the broken line in the diagram, that is, when they have reached the central position between the magnetoresistive element 11 and the other magnetoresistive element 12, the resistance value Ru is between the maximum value and the minimum value described later. The average value, the other resistance value RH, is the average value of the minimum value and the maximum value, which will be described later.
そして更にロータ６の歯が図示一点鎖線状態、即ら上記
他の磁気抵抗素子１２に最大接近した状態となると、上
記抵抗値Ｒ１＋が最小、他の抵抗値Ｒ＋２が最大となる
。Further, when the teeth of the rotor 6 are in the state shown by the dashed-dotted line in the figure, that is, in a state where they are maximally close to the other magnetoresistive element 12, the resistance value R1+ becomes the minimum and the other resistance value R+2 becomes the maximum.
第５図はこのように〇−夕６の回転にしたが−って変化
する磁気抵抗素子１１．１２の各抵抗値ＲＩ＋、Ｒ１□
の変化曲線、および磁気抵抗素子センサ７の検出信号、
即ち端子Ｃの出力電圧Ｖ１ の波形を表わしている。Figure 5 shows the resistance values RI+, R1□ of the magnetoresistive elements 11 and 12 that change according to the rotation of 〇-〇6.
The change curve of and the detection signal of the magnetoresistive element sensor 7,
That is, it represents the waveform of the output voltage V1 of terminal C.
なお図中の符＠■は端子Ａ、Ｂ間の印加電圧を表わして
いる。Note that the symbol @■ in the figure represents the voltage applied between terminals A and B.
第６図は磁気抵抗素子はンナ７と信号処理回路との電気
回路図を示している。FIG. 6 shows an electrical circuit diagram of the magnetoresistive element 7 and the signal processing circuit.
図中、７．１１．１２はそれぞれ磁気抵抗素子センサー
、磁気抵抗素子、磁気抵抗素子を表わして−５−
いる。また１３は信号ｆｆｉ理回路を表わしている。In the figure, 7, 11, and 12 represent a magnetoresistive element sensor, a magnetoresistive element, and a magnetoresistive element, respectively. Further, 13 represents a signal ffi logic circuit.
信号処理回路１３は、磁気抵抗素子センサ７の検出信号
をインピーダンス変換し安定した信号を出力するポルチ
ーシフスロワのバッファ１４と、抵抗１５どコンデン１
１１６とからなる時定数回路を含む積分器１７と該積分
器１７により平滑・平均化された基準信号をもとに上記
バッファ１４の出力信号を増幅する増幅器１８と、上記
Ｍ単信号と上記増幅器１８の出力信号とを比較Ｊる比較
器１９とを備えている。The signal processing circuit 13 includes a port shift thrower buffer 14 that converts the detection signal of the magnetoresistive element sensor 7 into impedance and outputs a stable signal, a resistor 15, and a capacitor 1.
an integrator 17 including a time constant circuit consisting of an integrator 116; an amplifier 18 for amplifying the output signal of the buffer 14 based on the reference signal smoothed and averaged by the integrator 17; A comparator 19 is provided for comparing the output signal of 18 with the output signal of 18.
次にこのように構成された回路の動作を説明する。Next, the operation of the circuit configured as described above will be explained.
ロータ６の回転にしたがって磁気抵抗素子センサ７から
出力される電圧信号はバッファ１４によりインピーダン
ス変換され、該バッファ１４から安定な出力信号が出力
される。このバッファ出力信号は積分器１７に入力され
ると共に増幅器１８に入力され、積分器１７から平滑・
平均化された基準信号が出力されると共に、増幅器１８
から上記基準信号をもとに上記バッファ出力信号を増幅
−６−
した増幅出力信号が出力される。ここで積分器１７にお
ける時定数回路は、上記検出信号の周期の変化範囲を考
慮し、低速走行時に基準信号がバッファ出力信号に極端
に追従してしまうことがなく、しかも車速が急変したよ
うな場合、あるいは雰囲気条例の変動により抵抗値Ｒ＋
＋ 、Ｒ１２が変動するようになった場合であってもバ
ッファ出力信号に充分追従し得るようイの時定数が定め
られている。The voltage signal output from the magnetoresistive element sensor 7 as the rotor 6 rotates is impedance-converted by the buffer 14, and a stable output signal is output from the buffer 14. This buffer output signal is input to the integrator 17 and to the amplifier 18, and from the integrator 17 is smoothed and
The averaged reference signal is output and the amplifier 18
An amplified output signal obtained by amplifying the buffer output signal based on the reference signal is output from the buffer output signal. Here, the time constant circuit in the integrator 17 takes into consideration the range of change in the period of the detection signal, and prevents the reference signal from extremely following the buffer output signal during low-speed driving, and also prevents the reference signal from extremely following the buffer output signal when the vehicle speed suddenly changes. The resistance value R +
The time constant of A is determined so as to be able to sufficiently follow the buffer output signal even if R12 and R12 start to fluctuate.
上記増幅出力信号と上記基準信号は比較器１９に入ツノ
され、該比較器１９で電圧比較され、該比較器１９から
パルス信号即ち車速パルス信号が出力される。なお比較
器１９に帰還抵抗２０を設け、ノイズ除去のためのヒス
テリシス特性をもたせている。The amplified output signal and the reference signal are input to a comparator 19, where the voltages are compared, and the comparator 19 outputs a pulse signal, that is, a vehicle speed pulse signal. Note that the comparator 19 is provided with a feedback resistor 20 to provide hysteresis characteristics for noise removal.
このように信号処理回路１３は磁気抵抗素子センサ７の
検出信号をもとに基準信号を生成すると共に、該基準信
号と上記検出信号とにもとづいて車速パルス信号を作成
する。この場合、基準信号は検出信号の周波数変動に充
分追従できしかも過応答しないように作成される。In this way, the signal processing circuit 13 generates a reference signal based on the detection signal of the magnetoresistive element sensor 7, and also creates a vehicle speed pulse signal based on the reference signal and the detection signal. In this case, the reference signal is created so as to be able to sufficiently follow the frequency fluctuations of the detection signal without overresponsiveness.
−７−
第７図は上記検出信号（バッファ出力信号）と−ト記基
準信号との関係を表わした図であり、この図から明らか
な如く、検出信号が変動すると、これに伴い基準信号が
追従し、結果どして安定な車速パルス信号が得られるよ
うになる。-7- Figure 7 is a diagram showing the relationship between the above detection signal (buffer output signal) and the reference signal mentioned above.As is clear from this figure, when the detection signal fluctuates, the reference signal changes accordingly. As a result, a stable vehicle speed pulse signal can be obtained.
尚、上述の実施例では車速検出について例示したが、エ
ンジンの回転速度検出など他の回転速度検出に適用して
もよい。In addition, although the above-mentioned embodiment illustrated vehicle speed detection, it may be applied to other rotational speed detection such as engine rotational speed detection.
以上説明した如く、本発明は回転速度に比例した周波数
の検出信号を発生する磁気抵抗素子センサと上記検出信
号を処理する信号処理回路とを髄え、回転速度に比例し
た速度パルス信号を生成する自動車用速度検出装置にお
いて、上記検出信号をインピーダンス変換するバッファ
と、該バッファ出力を平滑・平均化し基準信号を出力す
る積分器と、該積分器による基準信号をもとに上記バッ
ファ出力を増幅する増幅器と、該増幅器出力と上記基準
信号とを比較する比較器とを備え、該比較器から上記速
度パルス信号が出力されるよう上記信号処理回路を構成
した。As explained above, the present invention includes a magnetoresistive element sensor that generates a detection signal with a frequency proportional to the rotational speed and a signal processing circuit that processes the detection signal to generate a speed pulse signal proportional to the rotational speed. In an automobile speed detection device, a buffer converts the detection signal into impedance, an integrator smoothes and averages the buffer output and outputs a reference signal, and amplifies the buffer output based on the reference signal from the integrator. The signal processing circuit is configured to include an amplifier and a comparator for comparing the output of the amplifier with the reference signal, and to output the speed pulse signal from the comparator.
−８−
このため本発明によれば、低速走行時、磁気抵抗素子の
特性変化が生じた場合、あるいは車速が急変したような
場合、あるいはエンジン回転速度が急変したような場合
であっても、充分に安定した速度パルス信号を生成する
ことができ、アンチスキッド制御、エンジン速度制御や
車速表示などのために正確な回転速度情報を提供するこ
とが可能になる。-8- Therefore, according to the present invention, even when the characteristics of the magnetic resistance element change during low-speed driving, or when the vehicle speed suddenly changes, or when the engine rotation speed suddenly changes, A sufficiently stable speed pulse signal can be generated, making it possible to provide accurate rotational speed information for anti-skid control, engine speed control, vehicle speed display, etc.
第１図は本発明の一実施例構成、第２図は磁気抵抗素子
センナの構成、第３図はその電気等価回路、第４図は磁
気抵抗素子センサとロータとの関係を説明する説明図、
第５図は同様な説明図、第６図は磁気抵抗素子センサと
信号処理回路との電気回路図、第７図は基準信号と検出
信号との関係を説明する説明図を夫々示す。
６・・・ロータ ７・・・磁気抵抗素子センサ８・・
・プリント基板 １３・・・信号処理回路１４・・・
バッファ １７・・・積分器１８・・・増幅器
１９・・・比較器−９−
第１図
第２図
第３図
０
第７図
晴 間
第４図
第５図Fig. 1 shows the configuration of an embodiment of the present invention, Fig. 2 shows the structure of the magnetoresistive element sensor, Fig. 3 shows its electrical equivalent circuit, and Fig. 4 is an explanatory diagram explaining the relationship between the magnetoresistive element sensor and the rotor. ,
FIG. 5 is a similar explanatory diagram, FIG. 6 is an electric circuit diagram of the magnetoresistive element sensor and the signal processing circuit, and FIG. 7 is an explanatory diagram illustrating the relationship between the reference signal and the detection signal. 6... Rotor 7... Magnetoresistive element sensor 8...
・Printed circuit board 13...Signal processing circuit 14...
Buffer 17... Integrator 18... Amplifier
19...Comparator-9- Figure 1 Figure 2 Figure 3 Figure 0 Figure 7 Clearance Figure 4 Figure 5
Claims (1)
磁気抵抗素子センサと上記検出信号を処理する信号処理
回路とを備え、回転速度に比例１ノた速度パルス信号を
生成する自動車用速度検出装置において、上記検出信号
をインピーダンス変換するバッファと、該バッファ出力
を平滑・平均化し基準信号を出力Ｊる積分器と、該積分
器による基準信号をもとに上記バッファ出力を増幅する
増幅器と、該増幅器出力と上記基準信号とを比較器る比
較器とを備え、該比較器から上記速度パルス信号が出力
されるよう上記信号処理回路を構成したことを特徴とす
る自動車用速度検出装置。A speed detection device for an automobile that includes a magnetoresistive element sensor that emits a detection signal with a frequency proportional to the rotational speed and a signal processing circuit that processes the detection signal, and generates a speed pulse signal that is proportional to the rotational speed. The apparatus includes: a buffer for impedance converting the detection signal; an integrator for smoothing and averaging the buffer output and outputting a reference signal; and an amplifier for amplifying the buffer output based on the reference signal from the integrator. A speed detection device for an automobile, characterized in that the signal processing circuit is configured to include a comparator that compares the output of the amplifier with the reference signal, and the signal processing circuit is configured such that the speed pulse signal is output from the comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11582482A JPS595962A (en) | 1982-07-03 | 1982-07-03 | Speed detecting apparatus for automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11582482A JPS595962A (en) | 1982-07-03 | 1982-07-03 | Speed detecting apparatus for automobile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS595962A true JPS595962A (en) | 1984-01-12 |
Family
ID=14672012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11582482A Pending JPS595962A (en) | 1982-07-03 | 1982-07-03 | Speed detecting apparatus for automobile |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS595962A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0285047A2 (en) * | 1987-04-01 | 1988-10-05 | Alcatel SEL Aktiengesellschaft | Circuit for shaping a measure signal into a square wave signal |
| FR2629536A1 (en) * | 1988-04-04 | 1989-10-06 | Roulements Soc Nouvelle | MAGNETIC SENSOR BEARING WITH SELF-COMPENSATED DETECTION CIRCUIT |
| WO1990001233A1 (en) * | 1988-07-20 | 1990-02-08 | Deutsche Thomson-Brandt Gmbh | Conversion circuit |
| WO2004065966A1 (en) * | 2003-01-17 | 2004-08-05 | Central Japan Railway Company | Wheel speed detection system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52123673A (en) * | 1976-04-07 | 1977-10-18 | Bosch Gmbh Robert | Circuit system for detecting position of rotative part |
| JPS57200811A (en) * | 1981-06-04 | 1982-12-09 | Fuji Heavy Ind Ltd | Crank angle detecting device |
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1982
- 1982-07-03 JP JP11582482A patent/JPS595962A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52123673A (en) * | 1976-04-07 | 1977-10-18 | Bosch Gmbh Robert | Circuit system for detecting position of rotative part |
| JPS57200811A (en) * | 1981-06-04 | 1982-12-09 | Fuji Heavy Ind Ltd | Crank angle detecting device |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0285047A2 (en) * | 1987-04-01 | 1988-10-05 | Alcatel SEL Aktiengesellschaft | Circuit for shaping a measure signal into a square wave signal |
| US4922126A (en) * | 1987-04-01 | 1990-05-01 | Alcatel N.V. | Circuit for shaping a measurement-signal voltage into a square-wave signal |
| FR2629536A1 (en) * | 1988-04-04 | 1989-10-06 | Roulements Soc Nouvelle | MAGNETIC SENSOR BEARING WITH SELF-COMPENSATED DETECTION CIRCUIT |
| WO1990001233A1 (en) * | 1988-07-20 | 1990-02-08 | Deutsche Thomson-Brandt Gmbh | Conversion circuit |
| US5315260A (en) * | 1988-07-20 | 1994-05-24 | Deutsche Thomson-Brandt Gmbh | Apparatus for converting an AC component of a signal to a square wave |
| WO2004065966A1 (en) * | 2003-01-17 | 2004-08-05 | Central Japan Railway Company | Wheel speed detection system |
| US7324887B2 (en) | 2003-01-17 | 2008-01-29 | Central Japan Railway Company | Eddy current detection of wheel speed with voltage threshold shifting |
| CN100406895C (en) * | 2003-01-17 | 2008-07-30 | 东海旅客铁道株式会社 | Wheel speed detection system |
| US7680579B2 (en) | 2003-01-17 | 2010-03-16 | Central Japan Railway Company | Eddy current detection of wheel speed with voltage threshold shifting |
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