JP3252749B2 - Fault diagnosis device - Google Patents
Fault diagnosis deviceInfo
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- JP3252749B2 JP3252749B2 JP10898897A JP10898897A JP3252749B2 JP 3252749 B2 JP3252749 B2 JP 3252749B2 JP 10898897 A JP10898897 A JP 10898897A JP 10898897 A JP10898897 A JP 10898897A JP 3252749 B2 JP3252749 B2 JP 3252749B2
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- Prior art keywords
- output
- pulse
- waveform
- modulator
- sensor
- Prior art date
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- Tests Of Electronic Circuits (AREA)
- Logic Circuits (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Description
【０００１】[0001]
【発明の属する技術分野］本発明は、一対
の波形整形器を並列接続した並列冗長回路の故障診断機
能を高めるようにした故障診断装置に関する。 【０００２】BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a failure diagnosis apparatus which enhances a failure diagnosis function of a parallel redundant circuit in which a pair of waveform shapers are connected in parallel. [0002]
【従来の技術】自動車の操縦安定性を高めるため様々な
装置が開発されているが、なかでも過制動による車輪ロ
ックを自動的に防止するアンチロックブレーキ装置は、
雪道や雨上がりの道路などの滑りやすい路面を走行する
さいのスリップ防止事故に役立っている。この種のアン
チロックブレーキ装置は、車輪速と車体速の差から車輪
のスリップ率を検出し、ブレーキ機構に対して作動油を
供給する加圧状態とブレーキ機構からリザーバに作動油
を還流させる減圧状態を、目標スリップ率が保たれるよ
う切り替え制御し、これにより車輪ロックを防止する構
成とされている。車輪のスリップ率は、車輪速と車体速
から逆算される推定車輪速との差速度を車輪速で除算す
ることで得られ、スリップ率の計算には車輪速の正確な
検出が要求される。2. Description of the Related Art Various devices have been developed to enhance the driving stability of an automobile. Among them, an anti-lock brake device that automatically prevents wheel lock due to overbraking has been developed.
It helps prevent slippage when driving on slippery roads such as snowy roads and roads after rain. This type of anti-lock brake device detects the slip ratio of the wheel from the difference between the wheel speed and the vehicle speed, and pressurizes the brake oil to supply hydraulic oil to the brake mechanism and depressurizes the hydraulic oil from the brake mechanism to the reservoir. The state is switched so as to maintain the target slip ratio, thereby preventing wheel lock. The wheel slip ratio is obtained by dividing the difference speed between the wheel speed and the estimated wheel speed calculated backward from the vehicle speed by the wheel speed. The calculation of the slip ratio requires accurate detection of the wheel speed.
【０００３】車輪速を検出する車輪速センサとしては、
一般に車輪の回転速度に比例して周波数が増大する速度
パルスを発生するものが用いられ、例えば車輪軸に設け
た歯付き回転円盤の回転に伴う磁気的変化に感応して速
度パルスを発生する磁気式回転センサなどは、その代表
である。車輪速の計算は、車輪速センサから得られる速
度パルスによりカウンタをトリガし、このカウンタの歩
進計数出力を一定時間ごとに差分演算し、この差分演算
値を単位時間当たりに発生する速度パルスの個数すなわ
ち周波数に換算して求めるのが普通である。しかしなが
ら、磁気的変化に感応して速度パルスを発生する磁気式
回転センサに限らず、大半の車輪速センサは、車輪の回
転速度に応じて速度パルスの振幅も変化するといったセ
ンサに固有の出力特性を有しており、このため車輪速に
よらずカウンタにおいて安定かつ確実なトリガが行われ
るようにする必要があり、このため車輪速センサとＣＰ
Ｕとの間に波形整形器を配設し、速度パルスをほぼ所定
振幅のパルスに波形整形してＣＰＵに供給するのが普通
である。[0003] As a wheel speed sensor for detecting the wheel speed,
In general, a device that generates a speed pulse whose frequency increases in proportion to the rotation speed of a wheel is used.For example, a magnet that generates a speed pulse in response to a magnetic change accompanying rotation of a toothed rotating disk provided on a wheel shaft is used. A typical example is a rotation sensor. The wheel speed is calculated by triggering a counter with a speed pulse obtained from a wheel speed sensor, calculating the difference in the step count output of the counter at regular intervals, and calculating the difference calculated value of the speed pulse generated per unit time. Usually, it is calculated by converting the number, that is, the frequency. However, most wheel speed sensors are not limited to magnetic rotation sensors that generate speed pulses in response to magnetic changes, and most wheel speed sensors have output characteristics that are unique to the sensors, such as the amplitude of the speed pulse also changing according to the rotation speed of the wheel. Therefore, it is necessary to ensure that a stable and reliable trigger is performed in the counter regardless of the wheel speed.
Usually, a waveform shaper is disposed between the signal and U, the speed pulse is shaped into a pulse having a substantially predetermined amplitude and supplied to the CPU.
【０００４】ただし、車輪速センサとＣＰＵとの間に配
設した波形整形器は、必ずしも常に正常に作動するとは
限らず、万が一にせよ波形整形器に異常が発生したとき
にこの異常を早期発見することが肝心である。この場
合、ブレーキ機構を加圧状態か減圧状態に切り替えて目
標スリップ率が保たれるよう作動するアクチュエータの
場合は、状態変化を停止している非作動期間中に、制御
系に外乱を与えない程度のごく短い時間だけ外部から試
験信号を与えて故障診断することは可能である。しかし
ながら、回転中の車輪の回転に応じて常時速度パルスを
発生し続ける車輪速センサの場合、一旦車両を発進させ
た後は故障診断のための猶予期間を設定することは不可
能であり、車両を停止させた状態で故障診断するしかな
かった。ただし、その場合でも、車輪速センサは車輪が
回転している状態でなければ車輪速パルスを発生しない
ため、車両を停止させた状態で車輪に試験速度でもって
回転を与え、そのときの車輪速パルスから割り出される
回転速度が試験速度に一致するか否かを判定して車輪速
センサ後段の波形整形器の異常の有無を診断する必要が
あり、車体を浮揚支持できる設備を備えた専門の検査工
場等において検査するしかしなく、故障診断が容易でな
い等の問題があった。[0004] However, the waveform shaper disposed between the wheel speed sensor and the CPU does not always operate normally. If an abnormality occurs in the waveform shaper, the abnormality is detected early. It is important to do it. In this case, in the case of an actuator that operates so that the target slip ratio is maintained by switching the brake mechanism between the pressurized state and the depressurized state, no disturbance is given to the control system during the non-operation period in which the state change is stopped. It is possible to diagnose a failure by supplying a test signal from the outside only for a very short time. However, in the case of a wheel speed sensor that continuously generates a speed pulse in accordance with the rotation of the rotating wheel, once the vehicle is started, it is impossible to set a grace period for failure diagnosis. The fault diagnosis had to be performed with the system stopped. However, even in that case, the wheel speed sensor does not generate a wheel speed pulse unless the wheel is rotating, so that the wheel is rotated at the test speed with the vehicle stopped, and the wheel speed at that time is given. It is necessary to judge whether the rotation speed calculated from the pulse matches the test speed and diagnose the abnormality of the waveform shaper after the wheel speed sensor. There is a problem that the inspection is performed only at an inspection factory or the like, and the failure diagnosis is not easy.
【０００５】そこで、故障診断対象である波形整形器を
１個余分に設け、一対の波形整形器により並列冗長回路
を構成した故障診断装置の採用が検討されるようになっ
た。図４に示す故障診断装置１は、車輪速センサ２の出
力側に無作為に選択した一対の波形整形器３，４を並列
接続し、第１の波形整形器３の出力と第２の波形整形器
４の出力を排他的論理和回路５において波形比較し、両
者が一致しない場合に排他的論理和回路５のハイレベル
の出力を受けたＣＰＵ６が、少なくとも一方の波形整形
器３又は４の一方に異常が発生したもの判定する構成に
なっていた。[0005] In view of this, the use of a fault diagnostic device in which a redundant waveform shaper to be subjected to fault diagnosis is provided and a parallel redundant circuit is formed by a pair of waveform shapers has been studied. In the failure diagnosis device 1 shown in FIG. 4, a pair of randomly selected waveform shapers 3 and 4 are connected in parallel to the output side of the wheel speed sensor 2 so that the output of the first waveform shaper 3 and the second waveform The waveform of the output of the shaper 4 is compared in the exclusive OR circuit 5, and when the two do not match, the CPU 6 receiving the high-level output of the exclusive OR circuit 5 sends the signal to at least one of the waveform shapers 3 or 4. It was configured to determine that an abnormality had occurred on one side.
【０００６】[0006]
【発明が解決しようとする課題】上記従来の故障診断装
置１は、第１の波形整形器３と第２の波形整形器４が偶
然にせよ同時に故障する確率がごく稀であるという前提
に立ち、一方の波形整形器３又は４に故障が生じた場合
に正常な方の波形整形器４又は３によって異常を発見す
るという並列冗長回路に特有の故障発見原理に基づくも
のである。しかしながら、第１の波形整形器３と第２の
波形整形器４が同一ロットで製造され、その製造ロット
に共通の特性や欠陥を抱えていた場合、同一原因で同じ
故障を同時に引き起こす確率が皆無であるとは言えず、
同時に同じ故障を引き起こした場合、両者の異常は発見
されないまま見過ごされてしまうため、万全の故障診断
を期待することはできないといった課題があった。The above conventional fault diagnosis apparatus 1 is based on the premise that the probability that the first waveform shaper 3 and the second waveform shaper 4 will simultaneously and simultaneously fail is extremely rare. This is based on a failure detection principle peculiar to a parallel redundant circuit, in which, when one of the waveform shapers 3 or 4 fails, an abnormality is found by the normal waveform shaper 4 or 3. However, if the first waveform shaper 3 and the second waveform shaper 4 are manufactured in the same lot, and the manufactured lots have common characteristics and defects, there is no probability that the same failure will cause the same failure at the same time. It cannot be said that
If the same failure occurs at the same time, the two failures are overlooked without being discovered, and there has been a problem that it is not possible to expect thorough failure diagnosis.
【０００７】本発明は上記課題を解決したものであり、
並列冗長回路を構成する一対の波形整形器の冗長回路側
に変調器と復調器の縦列接続回路を挿入し、波形整形器
に入力される速度パルスの振幅を一定振幅に均一化し、
一対の波形整形器の整形内容に差をもたせ、同一故障原
因に基づく同時故障確率をほぼ皆無に押さえ込み、万全
の故障診断を可能にすることを目的とするものである。[0007] The present invention has solved the above problems,
A cascade connection of a modulator and a demodulator is inserted on the redundant circuit side of a pair of waveform shapers constituting a parallel redundant circuit, and the amplitude of the velocity pulse input to the waveform shaper is made uniform to a constant amplitude.
It is an object of the present invention to make a difference in shaping contents of a pair of waveform shapers, suppress a simultaneous failure probability based on the same failure cause almost completely, and enable thorough failure diagnosis.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するた
め、計測対象となる速度に対応して周波数が増す速度パ
ルスを出力するセンサと、該センサの出力パルスを波形
整形して所定振幅のパルスを出力する第１の波形整形器
と、前記センサの出力パルスにより所定の搬送波を変調
する変調器と、該変調器の出力を復調し、一定振幅のパ
ルスを出力する復調器と、該復調器の出力を波形整形す
る第２の波形整形器と、該第２の波形整形器の出力と前
記第１の波形整形器の出力との排他的論理和をとり、両
出力が不一致である場合に異常信号を発生する排他的論
理和回路とを具備することを特徴とするものである。In order to achieve the above object, a sensor for outputting a speed pulse whose frequency increases in accordance with the speed to be measured, a pulse having a predetermined amplitude by shaping the output pulse of the sensor. A first waveform shaper that outputs a signal, a modulator that modulates a predetermined carrier by an output pulse of the sensor, a demodulator that demodulates an output of the modulator, and outputs a pulse of a constant amplitude, and a demodulator. A second waveform shaper for waveform shaping the output of the second waveform shaper, and an exclusive OR of an output of the second waveform shaper and an output of the first waveform shaper is obtained. An exclusive OR circuit for generating an abnormal signal.
【０００９】また、前記変調器は、前記センサの出力パ
ルスをスペクトラム拡散変調するＳＳ変調器であり、前
記復調器は、前記変調器の出力を逆拡散してスペクトラ
ム拡散復調するＳＳ復調器であることを特徴とするもの
である。Further, the modulator is an SS modulator for performing spread spectrum modulation on an output pulse of the sensor, and the demodulator is an SS demodulator for performing despread spectrum demodulation by despreading the output of the modulator. It is characterized by the following.
【００１０】さらに、前記センサは、車輪の回転速度を
検出し、車輪が所定角度回転するつど速度パルスを出力
する車輪速センサであることを特徴とするものである。Further, the sensor is a wheel speed sensor that detects a rotation speed of a wheel and outputs a speed pulse each time the wheel rotates by a predetermined angle.
【００１１】[0011]
【発明の実施の形態】以下、本発明の実施形態について
図１ないし図３を参照して説明する。図１は、本発明の
故障診断装置の一実施形態を示す回路構成図、図２は、
図１に示した回路各部の正常時の信号波形図、図３は、
図１に示した回路各部の異常時の信号波形図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a circuit configuration diagram showing one embodiment of a failure diagnosis device of the present invention, and FIG.
FIG. 3 is a signal waveform diagram of each part of the circuit shown in FIG. 1 in a normal state.
FIG. 2 is a signal waveform diagram when each part of the circuit shown in FIG. 1 is abnormal.
【００１２】図１に示す故障診断装置１１は、アンチロ
ックブレーキ装置や四輪操舵装置に用いる車輪速センサ
２の出力を波形整形してＣＰＵ１６に供給する入力線路
に、一対の波形整形器３，４を並列接続して並列冗長回
路を構成するとともに、第２の波形整形器４の前段にＳ
Ｓ変調器１２とＳＳ復調器１３の縦列接続回路を挿入し
て構成してある。本実施形態にあっては、ＳＳ変調器１
２とＳＳ復調器１３の縦列接続回路と、ＳＳ変調器１２
とＳＳ復調器１３に拡散符号を供給するＣＰＵ１６を除
けば、従来の故障診断装置１と回路構成は同じである。A failure diagnosis device 11 shown in FIG. 1 is provided with a pair of waveform shapers 3 and 3 on an input line for waveform-shaping the output of a wheel speed sensor 2 used for an antilock brake device and a four-wheel steering device and supplying the output to a CPU 16. 4 are connected in parallel to form a parallel redundant circuit, and S
A cascade connection circuit of the S modulator 12 and the SS demodulator 13 is inserted. In the present embodiment, the SS modulator 1
2 and a cascade connection circuit of the SS demodulator 13 and the SS modulator 12
The circuit configuration is the same as that of the conventional fault diagnosis apparatus 1 except for the CPU 16 that supplies the spreading code to the SS demodulator 13 and the SS demodulator 13.
【００１３】ＳＳ変調器１２は、車輪速センサ２の出力
速度パルスにＣＰＵ１６が発生するＭ系列符号等の拡散
符号を乗算してスペクトラム拡散変調を行い、ＳＳ変調
出力をＳＳ復調器１３に供給する。ＳＳ復調器１３は、
ＳＳ変調出力にＣＰＵ１６が発生する前記拡散符号をＳ
Ｓ変調出力に乗積して逆拡散によりスペクトラム拡散復
調する。従って、Ｍ系列符号は二度に亙って乗積される
ことになり、スペクトラム拡散変調と逆拡散に使用する
Ｍ系列が同一信号源（ＣＰＵ１６）から発された同一符
号であることから、Ｍ系列符号の二乗値は“１”とな
り、結局、ＳＳ復調器１３からは速度パルスだけが復調
されることになる。かくして、ＳＳ復調器１３は、機器
に固有の一定振幅の復調出力を第２の波形整形器４に供
給することになる。The SS modulator 12 performs spread spectrum modulation by multiplying the output speed pulse of the wheel speed sensor 2 by a spread code such as an M-sequence code generated by the CPU 16, and supplies an SS modulated output to the SS demodulator 13. . The SS demodulator 13
The spreading code generated by the CPU 16 in the SS modulation output is represented by S
The product is multiplied by the S-modulation output and spread-spectrum demodulated by despreading. Therefore, the M-sequence code is multiplied twice, and the M-sequence used for spread spectrum modulation and despreading is the same code issued from the same signal source (CPU 16). The square value of the sequence code becomes “1”, and eventually only the velocity pulse is demodulated from the SS demodulator 13 . Thus, the SS demodulator 13 supplies the second waveform shaper 4 with a demodulated output having a constant amplitude unique to the device.
【００１４】これに対し、第１の波形整形器３の出力
は、速度パルスの波形整形出力としてＣＰＵ１６に供給
され、一方で排他的論理和回路５にも供給され、ここで
第２の波形整形器４の出力との波形比較による異常診断
にかけられる。従って、第１の波形整形器３も第２の波
形整形器４の正常に動作している場合は、波形整形器
３，４の出力間にはパルス幅の差異は見られず、排他的
論理和回路５の出力はロウレベルのままである。すなわ
ち、第１の波形整形器３は、周波数によって振幅が変化
する速度パルスを波形整形するものであるから、その波
形整形特性は入力速度パルスの振幅に応じた影響を受け
ることになるが、正常に作動している間は波形整形特性
が入力速度パルスの振幅に左右されることはない。On the other hand, the output of the first waveform shaper 3 is supplied to the CPU 16 as a speed pulse waveform shape output, and is also supplied to the exclusive OR circuit 5, where the second waveform shaper 3 outputs the speed pulse. The abnormality is diagnosed by comparing the waveform with the output of the detector 4. Therefore, when the first waveform shaper 3 is also operating normally, the pulse width difference is not seen between the outputs of the waveform shapers 3 and 4, and the exclusive logic The output of the sum circuit 5 remains at the low level. That is, since the first waveform shaper 3 shapes the speed pulse whose amplitude changes depending on the frequency, the waveform shaping characteristic is affected by the amplitude of the input speed pulse. During this operation, the waveform shaping characteristics are not affected by the amplitude of the input speed pulse.
【００１５】ただし、故障等が原因で波形整形特性が僅
かでも変質すると、第１の波形整形器３の波形整形出力
には、故障の影響が波形整形出力のパルス幅誤差となっ
て現れる。このため、仮に第１の波形整形器３と第２の
波形整形器４が同一ロットで製造され、原因箇所を同じ
くする同一故障を同時に発生したとしても、この故障の
現れ方は、車輪速センサ２の出力に直結され車輪の回転
速度に応じて振幅が変化する速度パルス（図３（Ａ）参
照）が入力する第１の波形整形器３と常に一定振幅のＳ
Ｓ復調器１３の出力パルス（図３（Ｄ）参照）が入力す
る第２の波形整形器４の入力振幅の違いに対応した相違
を見せることになる。その結果、こうして同時発生した
極端な同一故障についても、第１の波形整形器３の出力
と第２の波形整形器４の出力には、図３（Ｅ），（Ｆ）
に示したように、パルス幅において若干の相違（図３
（Ｆ）点線部で示す部分）が発生し、これが同図（Ｇ）
に示したように、排他的論理和回路５の出力として検出
される。すなわち、排他的論理和回路５のハイレベルの
出力により、波形整形器２，３の少なくとも一方に異常
が発生したことが検出されることになる。However, if the waveform shaping characteristic is slightly changed due to a failure or the like, the influence of the failure appears on the waveform shaping output of the first waveform shaper 3 as a pulse width error of the waveform shaping output. For this reason, even if the first waveform shaper 3 and the second waveform shaper 4 are manufactured in the same lot, and the same faults having the same cause are generated at the same time, the way of occurrence of the faults is determined by the wheel speed sensor. Directly connected to the output of 2, wheel rotation
Speed pulse whose amplitude changes according to the speed (see Fig. 3 (A))
1) and the first waveform shaper 3 that is input to the S
The output pulse of the S demodulator 13 (see FIG. 3D) is input.
A difference corresponding to the difference in the input amplitude of the second waveform shaper 4 is shown. As a result, even in the case of the same extreme failure that occurs at the same time, the outputs of the first waveform shaper 3 and the output of the second waveform shaper 4 are shown in FIGS.
As shown in FIG. 3 , there is a slight difference in pulse width (FIG. 3).
(F) portion) is generated as indicated by dotted line, which is drawing (G)
Is detected as an output of the exclusive OR circuit 5. That is, the high level output of the exclusive OR circuit 5 detects that an abnormality has occurred in at least one of the waveform shapers 2 and 3.
【００１６】このように、上記異常診断装置１１によれ
ば、速度パルスを波形整形して所定振幅のパルスを出力
する一対の波形整形器３，４により並列冗長回路を構成
するとともに、一方の波形整形器４の前段に、速度パル
スにより所定の搬送波を変調するＳＳ変調器１２と、こ
のＳＳ変調器１２出力を復調して一定振幅のパルスを出
力するＳＳ復調器１３の縦列接続回路を配設し、一対の
波形整形器３，４の出力との排他的論理和から波形不一
致を検出して異常信号を発生する構成としたから、一方
の波形整形器２に入力される速度パルスの振幅を変調と
復調の過程で一定振幅に均一化することで、一対の波形
整形器２，３の波形整形動作に差をもたせ、これにより
入力速度パルスの振幅に起因する変動要因にさらされる
他方の波形整形器２の出力に典型的に現れる故障の影響
の違いを、振幅面において波形整形内容が異なる一対の
波形整形器２，３により如実に検出することができ、並
列冗長回路構成の弱点である同一故障原因に基づく同時
故障を確実に異常検出し、故障診断機能を万全なものと
することができる。As described above, according to the abnormality diagnosing device 11, a parallel redundant circuit is constituted by the pair of waveform shapers 3 and 4 which shape the speed pulse and output a pulse having a predetermined amplitude. A cascade connection circuit of an SS modulator 12 for modulating a predetermined carrier wave by a speed pulse and an SS demodulator 13 for demodulating an output of the SS modulator 12 and outputting a pulse of a constant amplitude is provided at a stage preceding the shaper 4. Then, since a waveform mismatch is detected from the exclusive OR of the outputs of the pair of waveform shapers 3 and 4 to generate an abnormal signal, the amplitude of the velocity pulse input to one waveform shaper 2 is determined. By equalizing to a constant amplitude in the process of modulation and demodulation, the waveform shaping operations of the pair of waveform shapers 2 and 3 are made different from each other, whereby the other waveform is exposed to a fluctuation factor caused by the amplitude of the input speed pulse. Shaper The effect of the failure typically appearing in the output of the first embodiment can be clearly detected by a pair of waveform shapers 2 and 3 having different waveform shaping contents in the amplitude plane, and the same fault cause, which is a weak point of the parallel redundant circuit configuration, is detected. In this case, the simultaneous failure based on the abnormality can be reliably detected and the failure diagnosis function can be completed.
【００１７】また、変調器を、車輪速センサ２の出力パ
ルスをスペクトラム拡散変調するＳＳ変調器１２で構成
し、復調器を、変調器の出力を逆拡散してスペクトラム
拡散復調するＳＳ復調器１３で構成したから、ＳＳ変調
器１２とＳＳ復調器１３に対し同一の信号源から同じ拡
散符号を供給することで、拡散符号がＳＳ変調器１２と
ＳＳ復調器１３とで同期関係を損なうといった最悪の状
態を絶対的に排除することができ、互いに同期関係にあ
る同一の拡散符号を用いてスペクトラム拡散変調出力を
正確にスペクトラム拡散復調することができ、これによ
りＳＳ変調器１２の入力である速度パルスを位相情報を
保存したまま振幅についてだけ均一化して復調すること
ができ、一対の波形整形器１２，１３の整形内容に差を
もたせ、同一故障原因に基づく同時故障を確実に異常検
出することができる。The modulator comprises an SS modulator 12 for performing spread spectrum modulation on an output pulse of the wheel speed sensor 2, and the demodulator is an SS demodulator 13 for performing inverse spread spectrum demodulation by despreading the output of the modulator. Since the same spreading code is supplied from the same signal source to the SS modulator 12 and the SS demodulator 13, the worst case is that the spreading code impairs the synchronization relationship between the SS modulator 12 and the SS demodulator 13. Can be absolutely excluded, and the spread spectrum modulation output can be accurately spread spectrum demodulated using the same spreading code which is synchronous with each other, whereby the speed which is the input to the SS modulator 12 can be obtained. The pulse can be demodulated by equalizing only the amplitude while preserving the phase information, thereby providing a difference between the shaping contents of the pair of waveform shapers 12 and 13 and the same fault. It is possible to reliably detect abnormal simultaneous failure based on the cause.
【００１８】また、センサとして車輪の回転速度を検出
して車輪速パルスを出力する車輪速センサ２を用いたか
ら、車輪速パルスに基づいて車輪のスリップ率を検出し
てアンチロックブレーキ装置や四輪操舵装置等に適用す
る場合に、実際のシステムの稼働中に車輪速センサ２と
ＣＰＵ１６との間に介在する波形整形器３，４を確実に
診断し、システムの動作精度を高めることができる。Further, since the wheel speed sensor 2 which detects the rotational speed of the wheel and outputs a wheel speed pulse is used as a sensor, the slip ratio of the wheel is detected based on the wheel speed pulse, and the anti-lock brake device and the four-wheel When applied to a steering device or the like, the waveform shapers 3 and 4 interposed between the wheel speed sensor 2 and the CPU 16 can be reliably diagnosed during the actual operation of the system, and the operation accuracy of the system can be improved.
【００１９】なお、上記実施形態では、センサとして車
輪速センサ２を用いた場合を例にとったが、センサとし
て計測対象となる速度に対応して周波数が増す速度パル
スを出力するものであれば、他のものでもよい。また、
ＳＳ変調器１２とＳＳ復調器１３変調器に用いる拡散符
号は、Ｍ系列以外のＰＮ（擬似雑音）符号系列を用いる
ことが可能である。さらにまた、変調器と復調器は、Ｓ
Ｓ変調器１２やＳＳ復調器１３以外のもので構成するこ
ともできる。In the above embodiment, the case where the wheel speed sensor 2 is used as the sensor is taken as an example. However, if the sensor outputs a speed pulse whose frequency increases in accordance with the speed to be measured, the sensor may be used. , And others. Also,
As a spreading code used for the SS modulator 12 and the SS demodulator 13 modulator, a PN (pseudo noise) code sequence other than the M sequence can be used. Furthermore, the modulator and the demodulator are S
It is also possible to use a device other than the S modulator 12 and the SS demodulator 13.
【００２０】[0020]
【発明の効果】以上説明したように、本発明によれば、
速度パルスを波形整形して所定振幅のパルスを出力する
一対の波形整形器により並列冗長回路を構成するととも
に、一方の波形整形器の前段に、速度パルスにより所定
の搬送波を変調する変調器と、この変調器の出力を復調
して一定振幅のパルスを出力する復調器の縦列接続回路
を配設し、一対の波形整形器の出力との排他的論理和か
ら波形不一致を検出して異常信号を発生する構成とした
から、一方の波形整形器に入力される速度パルスの振幅
を変調と復調の過程で一定振幅に均一化することで、一
対の波形整形器の波形整形動作に差をもたせ、これによ
り入力速度パルスの振幅に起因する変動要因にさらされ
る他方の波形整形器の出力に典型的に現れる故障の影響
の違いを、振幅面において波形整形内容が異なる一対の
波形整形器により如実に検出することができ、並列冗長
回路構成の弱点である同一故障原因に基づく同時故障を
確実に異常検出し、故障診断機能を万全なものとするこ
とができる等の優れた効果を奏する。As described above, according to the present invention,
A parallel redundancy circuit is configured by a pair of waveform shapers that shape the speed pulse to output a pulse of a predetermined amplitude, and a modulator that modulates a predetermined carrier with the speed pulse at a stage preceding one of the waveform shapers, A cascade connection circuit of demodulators that demodulates the output of this modulator and outputs a pulse with a constant amplitude is provided, detects a waveform mismatch from the exclusive OR with the outputs of a pair of waveform shapers, and detects an abnormal signal. Since the configuration is such that the amplitude of the velocity pulse input to one of the waveform shapers is made uniform during the modulation and demodulation processes, the waveform shaping operations of the pair of waveform shapers have a difference. This allows the difference in the effect of the failure that typically appears on the output of the other waveform shaper exposed to the fluctuation factors caused by the amplitude of the input velocity pulse to be reduced by a pair of waveform shapers having different waveform shaping contents in the amplitude plane. Can indeed detect the simultaneous failure based on the same failure cause is weakness of parallel redundant circuitry reliably anomaly detection, an excellent effect such as can be made thorough failure diagnosis function.
【００２１】また、変調器を、センサの出力パルスをス
ペクトラム拡散変調するＳＳ変調器で構成し、復調器
が、変調器の出力を逆拡散してスペクトラム拡散復調す
るＳＳ復調器で構成したから、ＳＳ変調器とＳＳ復調器
に対し同一の信号源から同じ拡散符号を供給すること
で、拡散符号がＳＳ変調器とＳＳ復調器とで同期関係を
損なうといった最悪の状態を絶対的に排除することがで
き、互いに同期関係にある同一の拡散符号を用いてスペ
クトラム拡散変調出力を正確にスペクトラム拡散復調す
ることができ、これによりＳＳ変調器の入力である速度
パルスを位相情報を保存したまま振幅についてだけ均一
化して復調することができ、一対の波形整形器の整形内
容に差をもたせ、同一故障原因に基づく同時故障を確実
に異常検出することができる等の効果を奏する。Further, the modulator is constituted by an SS modulator for performing spread spectrum modulation on the output pulse of the sensor, and the demodulator is constituted by an SS demodulator for performing despread spectrum demodulation by despreading the output of the modulator. By supplying the same spreading code to the SS modulator and the SS demodulator from the same signal source, absolutely eliminating the worst-case situation where the spreading code breaks the synchronization relationship between the SS modulator and the SS demodulator. It is possible to accurately spread-spectrum demodulate the spread-spectrum modulated output using the same spread code that is synchronous with each other, thereby allowing the velocity pulse, which is the input of the SS modulator, to be measured with respect to the amplitude while preserving the phase information. Demodulation can be performed evenly, and the shaping contents of a pair of waveform shapers can be differentiated, and simultaneous failures based on the same failure cause can be reliably detected. The effect of such kill.
【００２２】また、本発明は、センサを、車輪の回転速
度を検出して車輪速パルスを出力する車輪速センサで構
成したから、車輪速パルスに基づいて車輪のスリップ率
を検出してアンチロックブレーキ装置や四輪操舵装置等
に適用する場合に、実際のシステムの稼働中に車輪速セ
ンサとカウンタ或いはＣＰＵとの間に介在する波形整形
器を確実に診断し、システムの動作精度を高めることが
できる等の効果を奏する。Further, according to the present invention, since the sensor is constituted by a wheel speed sensor which detects the rotational speed of the wheel and outputs a wheel speed pulse, the anti-lock system detects the slip ratio of the wheel based on the wheel speed pulse. When applied to a brake device or a four-wheel steering device, etc., it is necessary to reliably diagnose the waveform shaper interposed between the wheel speed sensor and the counter or the CPU during the actual operation of the system and to improve the operation accuracy of the system. And the like.
【図１】本発明の故障診断装置の一実施形態を示す回路
構成図である。FIG. 1 is a circuit diagram showing an embodiment of a failure diagnosis device according to the present invention.
【図２】図１に示した回路各部の正常時の信号波形図で
ある。FIG. 2 is a signal waveform diagram of each part of the circuit shown in FIG. 1 in a normal state.
【図３】図１に示した回路各部の異常時の信号波形図で
ある。FIG. 3 is a signal waveform diagram at the time of abnormality of each section of the circuit shown in FIG. 1;
【図４】従来の故障診断装置の一例を示す回路構成図で
ある。FIG. 4 is a circuit configuration diagram showing an example of a conventional failure diagnosis device.
２ 車輪速センサ ３ 第１の波形整形器 ４ 第２の波形整形器 ５ 排他的論理和回路 １１ 故障診断装置 １２ ＳＳ変調器 １３ ＳＳ復調器 2 Wheel speed sensor 3 First waveform shaper 4 Second waveform shaper 5 Exclusive OR circuit 11 Fault diagnostic device 12 SS modulator 13 SS demodulator
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) G01R 31/28 G01P 3/42 G01R 31/00 H03K 19/003 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) G01R 31/28 G01P 3/42 G01R 31/00 H03K 19/003
Claims (3)
増す速度パルスを出力するセンサと、該センサの出力パ
ルスを波形整形して所定振幅のパルスを出力する第１の
波形整形器と、前記センサの出力パルスにより所定の搬
送波を変調する変調器と、該変調器の出力を復調し、一
定振幅のパルスを出力する復調器と、該復調器の出力を
波形整形する第２の波形整形器と、該第２の波形整形器
の出力と前記第１の波形整形器の出力との排他的論理和
をとり、両出力が不一致である場合に異常信号を発生す
る排他的論理和回路とを具備することを特徴とする故障
診断装置。1. A sensor that outputs a speed pulse whose frequency increases in accordance with a speed to be measured, a first waveform shaper that shapes a waveform of an output pulse of the sensor and outputs a pulse of a predetermined amplitude, A modulator that modulates a predetermined carrier with an output pulse of the sensor, a demodulator that demodulates the output of the modulator and outputs a pulse of a constant amplitude, and a second waveform shaping that shapes the output of the demodulator An exclusive OR circuit for taking an exclusive OR of the output of the second waveform shaper and the output of the first waveform shaper, and generating an abnormal signal when both outputs do not match. A failure diagnostic device comprising:
をスペクトラム拡散変調するＳＳ変調器であり、前記復
調器は、前記変調器の出力を逆拡散してスペクトラム拡
散復調するＳＳ復調器であることを特徴とする請求項１
記載の故障診断装置。2. The modulator according to claim 1, wherein the modulator is an SS modulator that performs spread spectrum modulation on an output pulse from the sensor, and the demodulator is an SS demodulator that performs despread spectrum demodulation by despreading the output of the modulator. 2. The method according to claim 1, wherein
The failure diagnosis device according to the above.
し、車輪が所定角度回転するつど速度パルスを出力する
車輪速センサであることを特徴とする請求項１記載の故
障診断装置。3. The fault diagnosis device according to claim 1, wherein the sensor is a wheel speed sensor that detects a rotation speed of the wheel and outputs a speed pulse each time the wheel rotates by a predetermined angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10898897A JP3252749B2 (en) | 1997-04-25 | 1997-04-25 | Fault diagnosis device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10898897A JP3252749B2 (en) | 1997-04-25 | 1997-04-25 | Fault diagnosis device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10300820A JPH10300820A (en) | 1998-11-13 |
| JP3252749B2 true JP3252749B2 (en) | 2002-02-04 |
Family
ID=14498752
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10898897A Expired - Fee Related JP3252749B2 (en) | 1997-04-25 | 1997-04-25 | Fault diagnosis device |
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| Country | Link |
|---|---|
| JP (1) | JP3252749B2 (en) |
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| WO2021157360A1 (en) * | 2020-02-06 | 2021-08-12 | パナソニックＩｐマネジメント株式会社 | Physical quantity detection device and failure determination method |
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| JPH10300820A (en) | 1998-11-13 |
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