JPS6390642A - Trouble diagnostic device for air-fuel ratio control device - Google Patents
Trouble diagnostic device for air-fuel ratio control deviceInfo
- Publication number
- JPS6390642A JPS6390642A JP61235273A JP23527386A JPS6390642A JP S6390642 A JPS6390642 A JP S6390642A JP 61235273 A JP61235273 A JP 61235273A JP 23527386 A JP23527386 A JP 23527386A JP S6390642 A JPS6390642 A JP S6390642A
- Authority
- JP
- Japan
- Prior art keywords
- air
- fuel ratio
- engine
- altitude
- pulse signal
- 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
- 239000000446 fuel Substances 0.000 title claims abstract description 55
- 238000003745 diagnosis Methods 0.000 claims abstract description 21
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000007257 malfunction Effects 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 1
Landscapes
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Control Of The Air-Fuel Ratio Of Carburetors (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
この発明は、いわゆる電子制御式気化器を用いた空燃比
制御装置の故障の有無を診断する装置に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a device for diagnosing the presence or absence of a failure in an air-fuel ratio control device using a so-called electronically controlled carburetor.
従来の技術
たとえば、三元触媒を用いて排気浄化を行なう内燃機関
においては空燃比を理論空燃比に高精度に維持する必要
がある。そのため、排気通路に残存酸素濃度に関連した
信号を出力する０２センサを設け、その出力信号に基づ
き、気化器の空燃比補正用電磁弁の開閉割合を変化させ
て、空燃比をフィードバック制御するようにした空燃比
制御装置が知られている。BACKGROUND OF THE INVENTION For example, in an internal combustion engine that uses a three-way catalyst to purify exhaust gas, it is necessary to maintain the air-fuel ratio at the stoichiometric air-fuel ratio with high precision. Therefore, an 02 sensor that outputs a signal related to the residual oxygen concentration is installed in the exhaust passage, and based on the output signal, the opening/closing ratio of the solenoid valve for air-fuel ratio correction of the carburetor is changed to perform feedback control of the air-fuel ratio. An air-fuel ratio control device is known.
この空燃比制御装置が故障していると、当然のことなが
ら正常な排気浄化作用が働かず、排気成分の悪化を招く
ことになるが、その場合でも通常は気化器としての基本
的な空燃比の調節は行なイっれるので、運転性の悪化を
来す程度でなければ運伝音は一般に気づき難い。そこで
近年、この種の故障を診断し何らかの警告を発する装置
が要請されている。If this air-fuel ratio control device is malfunctioning, naturally the normal exhaust purification effect will not work, leading to deterioration of exhaust components, but even in that case, the basic air-fuel ratio as a carburetor Since the noise is not easily adjusted, it is generally difficult to notice the noise unless it causes a deterioration in drivability. Therefore, in recent years, there has been a demand for a device that can diagnose this type of failure and issue some kind of warning.
このような故障診断装置としては、例えば燃料噴射式機
関では、従来特開昭５８−２１４６３４号公報に記載の
ように、燃料噴射弁に流れる電流をモニターして該噴射
弁が正常に作動しているか否かを検出する方式のものが
知られている。For example, in a fuel injection type engine, such a failure diagnosis device monitors the current flowing through the fuel injection valve to check whether the injection valve is operating normally, as described in Japanese Patent Application Laid-Open No. 58-214634. There is a known method for detecting whether or not the vehicle is present.
発明が解決しようとする問題点
しかし、上記従来の故障診断装置を気化器方式の空燃比
制御装置に適用したとしても、空燃比補正用電磁弁の断
線あるいはショート等による不作動は検出できるものの
、この空燃比補正用電磁弁が開閉する補正用エアブリー
ドのつまり、補正用メインジェットのゆるみ、あるいは
この空燃比補正用電磁弁の作動不良といった不具合は検
知することができない。Problems to be Solved by the Invention However, even if the conventional failure diagnosis device described above is applied to a carburetor type air-fuel ratio control device, it is possible to detect malfunction due to disconnection or short circuit of the air-fuel ratio correction solenoid valve. Problems such as clogging of the correction air bleed that is opened and closed by the air-fuel ratio correction solenoid valve, loosening of the correction main jet, or malfunction of the air-fuel ratio correction solenoid valve cannot be detected.
問題点を解決するための手段
この発明は、ある運転条件下における空燃比補正用電磁
弁の駆動パルス信号の０Ｎ−ＯＦＦデユーティ比の異常
からその故障を検出するようにしたしのである。即ち、
この発明に係る空燃比制御装置の故障診断装置は、第１
図に示すように、排気中の残存酸素濃度に関連した信号
を出力ずろ０２センザｌと、駆動パルス信号によって開
閉動作し、気化器が生成する混合気の空燃比を補正する
空燃比補正用電磁弁２と、上記０２センサｌの出力信号
に基づき、上記駆動パルス信号の０Ｎ−ＯＦＦデユーテ
ィ比を制御する電磁弁制御手段３とを備えてなる内燃機
関の空燃比制御装置において、高度を直接らしくは間接
に検出する手段４と、この高度が診断可能高度内にある
か判別する手段５と、機関がアイドル状態にあることを
検出する手段６と、機関が予め定めた所定運転条件にあ
ることを検出する手段７と、このアイドル及び所定運転
条件のときに、上記デユーティ比が夫々所定の範囲内に
あるか判別する手段８と、診断可能高度内において両者
が何れも所定範囲外であるときに警告を発する手段９と
を備えて構成されている。Means for Solving the Problems In the present invention, a failure is detected from an abnormality in the ON-OFF duty ratio of a drive pulse signal of an air-fuel ratio correcting electromagnetic valve under certain operating conditions. That is,
A failure diagnosis device for an air-fuel ratio control device according to the present invention includes a first
As shown in the figure, there is an air-fuel ratio correction electromagnetic sensor that outputs a signal related to the residual oxygen concentration in the exhaust gas, and an air-fuel ratio correction electromagnetic sensor that opens and closes according to the drive pulse signal and corrects the air-fuel ratio of the mixture generated by the carburetor. An air-fuel ratio control device for an internal combustion engine comprising a valve 2 and a solenoid valve control means 3 for controlling the 0N-OFF duty ratio of the drive pulse signal based on the output signal of the 02 sensor l, which directly controls the altitude. a means 4 for indirectly detecting, a means 5 for determining whether this altitude is within a diagnostic altitude, a means 6 for detecting that the engine is in an idle state, and a means 6 for detecting that the engine is in a predetermined operating condition. and means 8 for determining whether the duty ratio is within a predetermined range under the idle and predetermined operating conditions, and when both are outside the predetermined range within the diagnosable altitude. and means 9 for issuing a warning.
作用
補正用エアブリードもしくは補正用燃料ジェットを空燃
比補正用電磁弁で開閉する気化器形式の空燃比制御装置
では、空燃比補正用電磁弁のＯＮ・ＯＦＦデユーティ比
に対して制御できる混合気の幅が狭いため、ある高度以
上では、第３図に示すように、空燃比のフィードバック
制御が不可能となる。従って、その高度以下でのみ故障
の診断が可能であり、この診断可能高度以上の場合は故
障診断は行なわない。そしてこの診断可能高度内におい
て、機関がアイドル状態となったときにデユーティ比が
所定範囲内か否か判別される。次いで、機関が予め定め
た所定運転条件となったときに、やはりデユーティ比が
所定範囲内か否か判別される。このように２点で判別を
行なうのは、誤診断を防止するためである。この２点の
診断でデユーティ比が何れも所定範囲外であった場合は
、警告手段９によって所定の警告が行なわれる。In a carburetor-type air-fuel ratio control device in which an air bleed for action correction or a fuel jet for correction is opened and closed by a solenoid valve for air-fuel ratio correction, the air-fuel mixture that can be controlled by the ON/OFF duty ratio of the solenoid valve for air-fuel ratio correction is Because the width is narrow, feedback control of the air-fuel ratio becomes impossible above a certain altitude, as shown in FIG. Therefore, failure diagnosis is possible only below this altitude, and failure diagnosis is not performed above this diagnosable altitude. Then, within this diagnosable altitude, it is determined whether the duty ratio is within a predetermined range when the engine is in an idle state. Next, when the engine reaches a predetermined operating condition, it is determined whether the duty ratio is within a predetermined range. The reason for performing the discrimination based on two points in this way is to prevent misdiagnosis. If both of the duty ratios are outside the predetermined range in these two points of diagnosis, the warning means 9 issues a predetermined warning.
実施例
第２図はこの発明の一実施例を示す構成説明図であって
、１１は内燃機関本体、１２は上流にエアクリーナ１３
を備えた吸気通路、１４は三元触媒１５が介装された排
気通路を示している。Embodiment FIG. 2 is a configuration explanatory diagram showing an embodiment of the present invention, in which 11 is an internal combustion engine body, 12 is an air cleaner 13 upstream.
14 indicates an exhaust passage in which a three-way catalyst 15 is interposed.
上記吸気通路１２には、空燃比補正用電磁弁１７を内蔵
した電子制御式気化器１６が配設されているとともに、
絞弁１８の下流に、機関吸入負圧を検出する圧力センサ
１９が配設されている。そして上記絞弁１８に対し、そ
の全開状態を検出するアイドルスイツヂ２０が設けられ
ている。An electronically controlled carburetor 16 having a built-in solenoid valve 17 for air-fuel ratio correction is disposed in the intake passage 12.
A pressure sensor 19 is disposed downstream of the throttle valve 18 to detect engine suction negative pressure. An idle switch 20 is provided for the throttle valve 18 to detect its fully open state.
また上記排気通路１４の三元触媒１５より上流位置に、
排気中の残存酸素濃度に応じた起電力を発生する０、セ
ンサ２１が配設されている。Further, at a position upstream of the three-way catalyst 15 in the exhaust passage 14,
A sensor 21 is provided that generates an electromotive force according to the concentration of residual oxygen in the exhaust gas.
また２２は機関回転速度を検出するために設けられた所
定クランク角毎にパルス信号を発生するクランク角セン
サ、２３は制御回路を示している。この制御回路２３は
、いわゆるマイクロコンピュータシステムを用いたもの
で、０２センザ２１を用いた空燃比フィードバック制御
方式による気化器１６の空燃比制御を行なっているとと
しに、後述するように空燃比制御装置の故障診断を行な
い、「故障」と判断した場合には警告ランプ２４等の警
告手段を作動させるようになっている。Further, 22 indicates a crank angle sensor that is provided to detect the engine rotational speed and generates a pulse signal at every predetermined crank angle, and 23 indicates a control circuit. This control circuit 23 uses a so-called microcomputer system, and controls the air-fuel ratio of the carburetor 16 by an air-fuel ratio feedback control method using the 02 sensor 21. A failure diagnosis of the device is performed, and if it is determined that there is a "failure", a warning means such as a warning lamp 24 is activated.
第４図は、上記電子制御式気化器１６の一構成例を示す
もので、スロー燃料通路２５に空燃比補正用の空気を導
入する補正用スローエアブリード２６が設けられている
とともに、メイン燃料通路２７に空燃比補正用燃料を導
入する補正用メインジェット２８が設けられている。そ
して空燃比補正用電磁弁１７は、上端に上記補正用スロ
ーエアブリード２６を開閉する弁体２９を備えていると
ともに、下端に上記補正用メインジェット２８を開閉す
る弁体３ｏを備えており、ＯＦＦ時には図示するように
上端の弁体２９が上記補正用スローエアブリード２６を
閉塞するとともに、下端の弁体３ｏが上記補正用メイン
ジェット２８を開放し、ＯＮ時には下端の弁体３０が上
記補正用メインジェット２８を閉塞するとともに、上端
の弁体２９が上記補正用スローエアブリード２６を開放
する構成となっている。尚、３１はメインジェット、３
２はメインエアブリード、３３はスローエアブリード、
３４はメインノズル、３５はスローポート、３６はフロ
ート室を夫々示している。即ち、上記空燃比補正用？Ｔ
ｉ磁弁１フは、一定周期例えば４０Ｈｚ程度で常時０Ｎ
−ＯＦＦ動作しているのであり、その０８時間割合つま
りデユーティ比を増加させれば空燃比をリーン化さ仕る
ことができ、逆に０８時間割合を減少させれば空燃比を
リッチ化させることができるのである。FIG. 4 shows an example of the configuration of the electronically controlled carburetor 16, in which a correction slow air bleed 26 for introducing air for air-fuel ratio correction into the slow fuel passage 25 is provided, and the main fuel A correction main jet 28 is provided for introducing fuel for air-fuel ratio correction into the passage 27 . The air-fuel ratio correction solenoid valve 17 has a valve body 29 at its upper end that opens and closes the correction slow air bleed 26, and a valve body 3o which opens and closes the correction main jet 28 at its lower end. At times, as shown in the figure, the valve element 29 at the upper end closes the correction slow air bleed 26, and the valve element 3o at the lower end opens the correction main jet 28, and when ON, the lower valve element 30 closes the correction main jet 26. 28 is closed, and a valve body 29 at the upper end opens the correction slow air bleed 26. In addition, 31 is the main jet, 3
2 is main air bleed, 33 is slow air bleed,
34 is a main nozzle, 35 is a slow port, and 36 is a float chamber. In other words, for the air-fuel ratio correction mentioned above? T
i Solenoid valve 1 is always 0N at a constant cycle of about 40Hz.
-OFF operation.If you increase the 08 hour ratio, that is, the duty ratio, you can make the air-fuel ratio leaner, and conversely, if you decrease the 08 hour ratio, you can make the air-fuel ratio richer. This is possible.
次に、第５図は上記制御回路２３において実行される故
障診断のためのフローチャートを示しており、以下これ
を説明する。Next, FIG. 5 shows a flowchart for fault diagnosis executed in the control circuit 23, which will be explained below.
まずステップ！ではフラグの判定を行なう。このフラグ
が「０」である場合には次にステップ２へ進み、アイド
ル状態であるか否かをアイドルスイッチ２０の検出信号
に基づいて判定する。ここでアイドル状態でなければ故
障診断は行なわない（ステップ４）。機関がアイドル状
態にあれば次にステップ３に進み、高度の判定を行なう
。具体的には、クランク角センサ２２が検出した機関回
転数と、圧力センサ１９が検出した機関吸入負圧とが予
め定めた設定値内か否かによって高度の判定を行なう。Step first! Now let's check the flag. If this flag is "0", the process proceeds to step 2, and it is determined based on the detection signal of the idle switch 20 whether or not the vehicle is in an idle state. If the vehicle is not in an idle state, no fault diagnosis is performed (step 4). If the engine is in an idle state, the process proceeds to step 3, where the altitude is determined. Specifically, the altitude is determined based on whether the engine speed detected by the crank angle sensor 22 and the engine suction negative pressure detected by the pressure sensor 19 are within predetermined set values.
このステップ３の判定でそのときの高度が診断可能高度
（第３図参照）以内でなければ故障診断は行なわない（
ステップ４）。高度が診断可能高度内である場合にはス
テップ５でこのアイドル状態におけろ駆動パルス信号の
０Ｎ−ＯＦＦデユーティ比が設定値内であるか否かを判
定する。このデユーティ比が設定値内である場合には空
燃比制御装置が正常であるものとして警告灯は点灯しな
い（ステップ６）。そして、デユーティ比が所定範囲内
になければステップ７でフラグを「１」とする。従って
次回からはステップｌからステップ８へ進むことになる
。ステップ８では閉ループ制御中であるか否か、即ち空
燃比フィードバック制御が行なわれているか否かを判定
している。閉ループ制御中であることを条件としてステ
ップ９へ進み、ここで所定運転条件例えば機関回転数が
２００Ｏｒｐｍでかつ機関吸入負圧が−３００Ｎ ｍ
ＩＩ ｇのときに、駆動パルス信号のデユーティ比が所
定範囲内にあるが否かを判定する。そして、ここで所定
範囲内でなければステップ１２へ進み警告ランプ２４を
点灯する。If the altitude at that time is within the diagnosable altitude (see Figure 3) as determined in step 3, failure diagnosis will not be performed (
Step 4). If the altitude is within the diagnosable altitude, it is determined in step 5 whether the ON-OFF duty ratio of the drive pulse signal in this idle state is within the set value. If this duty ratio is within the set value, it is assumed that the air-fuel ratio control device is normal and the warning light does not light up (step 6). If the duty ratio is not within the predetermined range, the flag is set to "1" in step 7. Therefore, from next time onwards, the process will proceed from step 1 to step 8. In step 8, it is determined whether closed-loop control is being performed, that is, whether air-fuel ratio feedback control is being performed. Proceed to step 9 on the condition that closed loop control is in progress, and here the predetermined operating conditions are set, for example, the engine speed is 200 Orpm and the engine suction negative pressure is -300 Nm.
At IIg, it is determined whether the duty ratio of the drive pulse signal is within a predetermined range. If it is not within the predetermined range, the process proceeds to step 12 and the warning lamp 24 is turned on.
ニーティ比が異常値であり、かつその直後に機関が所定
の運転条件に達したときに、やはり駆動パルス信号のデ
ユーティ比が異常値であれば、初めて空燃比制御装置が
故障であると判定され、警告ランプ２４が点灯するので
ある。このように２点の運転条件下で診断を行なうこと
により誤診断のない正確な故障診断を行なうことができ
る。If the duty ratio of the drive pulse signal is also an abnormal value when the duty ratio of the drive pulse signal is an abnormal value immediately after the duty ratio of the drive pulse signal is an abnormal value, it is determined that the air-fuel ratio control device is malfunctioning. , the warning lamp 24 lights up. By performing diagnosis under two operating conditions in this manner, accurate failure diagnosis without misdiagnosis can be performed.
尚、上記実施例では機関回転数と機関吸入負圧とを用い
て高度を検出し、診断可能高度内であるか否かを判定し
ているが、大気圧センサもしくは大気圧スイッチを用い
て高度の判定を行なうように構成することもできる。In the above embodiment, the altitude is detected using the engine rotation speed and engine suction negative pressure to determine whether or not the altitude is within the diagnostic range. It can also be configured to make a determination.
発明の効果
以上の説明で明らかなように、この発明に係る空燃比制
御装置の故障診断装置においては、駆動パルス信号のデ
ユーティ比の異常から故障を診断するようにしたので、
空燃比補正用電磁弁の断線あるいはショートによる不作
動はもちろんのこと、この空燃比補正用電磁弁が開閉す
る補正用エアブリーＶのっすｈ 捕Ｔ…漱寮１・゛ン丁
・へｌｋ小篩１Ｌあるいは空燃比補正用電磁弁の作動不
良といった不具合をも確実に検出することができる。そ
してアイドルと所定運転条件下での２点でデユーティ比
の診断を行なうので確実な診断が行なえ、誤診断を防止
することができ、信頼性の高い故障診断を行なうことが
できる。Effects of the Invention As is clear from the above explanation, in the failure diagnosis device for an air-fuel ratio control device according to the present invention, failures are diagnosed based on an abnormality in the duty ratio of the drive pulse signal.
Not only will the solenoid valve for air-fuel ratio correction be inoperable due to disconnection or short-circuiting, but also the air-breathing valve for correction that opens and closes this solenoid valve for air-fuel ratio correction. It is also possible to reliably detect malfunctions such as malfunction of the sieve 1L or the air-fuel ratio correction solenoid valve. Since the duty ratio is diagnosed at two points: idling and under predetermined operating conditions, reliable diagnosis can be performed, erroneous diagnosis can be prevented, and highly reliable failure diagnosis can be performed.
第１図はこの発明の構成を示す機能ブロック図、第２図
はこの発明に係る故障診断装置の一実施例を示す構成説
明図、第３図は高度とデユーティ比との関係を示す特性
図、第４図は電子制御式気化器の一実施例を示す断面図
、第５図は上記実施例における故障診断プログラムを示
すフローチャートである。
１・・・Ｏ２センサ、２・・・空燃比補正用ｉ＠弁、３
・・・電磁弁制御手段、・１・・高度検出手段、５・・
・高度判別手段、６・・・アイドル状態検出手段、７・
・・所定条件検出手段、８・・・デユーティ比判別手段
、９・・・警外２名
＝ば
謝
（Ｖコ一＋２FIG. 1 is a functional block diagram showing the configuration of the present invention, FIG. 2 is a configuration explanatory diagram showing an embodiment of the failure diagnosis device according to the present invention, and FIG. 3 is a characteristic diagram showing the relationship between altitude and duty ratio. , FIG. 4 is a sectional view showing one embodiment of the electronically controlled carburetor, and FIG. 5 is a flowchart showing a failure diagnosis program in the above embodiment. 1... O2 sensor, 2... i@valve for air-fuel ratio correction, 3
... Solenoid valve control means, 1. Altitude detection means, 5.
・Altitude determination means, 6... Idle state detection means, 7.
. . . Predetermined condition detection means, 8 . . Duty ratio determination means, 9 . . .
Claims (1)
Ｏ＿２センサと、駆動パルス信号によって開閉動作し、
気化器が生成する混合気の空燃比を補正する空燃比補正
用電磁弁と、上記Ｏ＿２センサの出力信号に基づき、上
記駆動パルス信号のＯＮ・ＯＦＦデューティ比を制御す
る電磁弁制御手段とを備えてなる内燃機関の空燃比制御
装置において、高度を直接もしくは間接に検出する手段
と、この高度が診断可能高度内にあるか判別する手段と
、機関がアイドル状態にあることを検出する手段と、機
関が予め定めた所定運転条件にあることを検出する手段
と、このアイドルおよび所定運転条件のときに、上記デ
ューティ比が夫々所定の範囲内にあるか判別する手段と
、診断可能高度内において両者が何れも所定範囲外であ
るときに警告を発する手段とを備えてなる空燃比制御装
置の故障診断装置。(1) An O_2 sensor that outputs a signal related to the residual oxygen concentration in exhaust gas, and a drive pulse signal that opens and closes the sensor.
An air-fuel ratio correction solenoid valve that corrects the air-fuel ratio of the air-fuel mixture generated by the carburetor, and a solenoid valve control means that controls the ON/OFF duty ratio of the drive pulse signal based on the output signal of the O_2 sensor. An air-fuel ratio control device for an internal combustion engine comprising: means for directly or indirectly detecting altitude; means for determining whether this altitude is within a diagnostic altitude; and means for detecting that the engine is in an idle state; means for detecting that the engine is under a predetermined operating condition; means for determining whether the duty ratio is within a predetermined range when the engine is idling and under the predetermined operating condition; 1. A failure diagnosis device for an air-fuel ratio control device, comprising means for issuing a warning when both are outside a predetermined range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61235273A JPS6390642A (en) | 1986-10-02 | 1986-10-02 | Trouble diagnostic device for air-fuel ratio control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61235273A JPS6390642A (en) | 1986-10-02 | 1986-10-02 | Trouble diagnostic device for air-fuel ratio control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6390642A true JPS6390642A (en) | 1988-04-21 |
Family
ID=16983652
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61235273A Pending JPS6390642A (en) | 1986-10-02 | 1986-10-02 | Trouble diagnostic device for air-fuel ratio control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6390642A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019161183A (en) * | 2018-03-16 | 2019-09-19 | 株式会社東芝 | Multiple flat magnetic metal particles, compact material, and rotary electric machine |
-
1986
- 1986-10-02 JP JP61235273A patent/JPS6390642A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019161183A (en) * | 2018-03-16 | 2019-09-19 | 株式会社東芝 | Multiple flat magnetic metal particles, compact material, and rotary electric machine |
| JP2021100119A (en) * | 2018-03-16 | 2021-07-01 | 株式会社東芝 | Pressed powder material and rotary electric machine |
| US11597010B2 (en) | 2018-03-16 | 2023-03-07 | Kabushiki Kaisha Toshiba | Plurality of flaky magnetic metal particles, pressed powder material, and rotating electric machine |
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