JP2694678B2 - Failure detection device for solenoid valve for changing natural frequency of intake pipe - Google Patents
Failure detection device for solenoid valve for changing natural frequency of intake pipeInfo
- Publication number
- JP2694678B2 JP2694678B2 JP13389992A JP13389992A JP2694678B2 JP 2694678 B2 JP2694678 B2 JP 2694678B2 JP 13389992 A JP13389992 A JP 13389992A JP 13389992 A JP13389992 A JP 13389992A JP 2694678 B2 JP2694678 B2 JP 2694678B2
- Authority
- JP
- Japan
- Prior art keywords
- solenoid valve
- intake
- natural frequency
- intake pipe
- changing
- 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.)
- Expired - Fee Related
Links
Landscapes
- Characterised By The Charging Evacuation (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、吸気管の固有振動数を
変化させるための吸気管固有振動数変更装置を作動させ
るソレノイドバルブの故障検知装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a failure detecting device for a solenoid valve which operates an intake pipe natural frequency changing device for changing the natural frequency of the intake pipe.
【０００２】[0002]
【従来の技術】吸気管の固有振動数を変化させるための
吸気管固有振動数変更装置として、例えば、エンジンの
吸気管内に連なるように、吸気音を低減させるためのレ
ゾネータチャンバとして作用する空間を設け、該レゾネ
ータチャンバの入口をエンジンの回転数に応じて開閉す
ることにより吸気音を効率よく低減させることが行われ
ている（実開昭６４−３４４５８号）。2. Description of the Related Art As an intake pipe natural frequency changing device for changing the natural frequency of an intake pipe, for example, a space acting as a resonator chamber for reducing intake noise is connected to the inside of an intake pipe of an engine. It is provided that the intake noise is efficiently reduced by opening and closing the inlet of the resonator chamber according to the engine speed (Japanese Utility Model Laid-Open No. 64-34458).
【０００３】また、吸気通路をバイパスする通路状の空
間を設け、該空間の入口をエンジンの回転数に応じて開
閉し吸気効率の向上や出力の増大を図っている（特開昭
６４−１２０４４号）。Further, a passage-like space that bypasses the intake passage is provided, and the inlet of the space is opened / closed in accordance with the engine speed to improve intake efficiency and output (Japanese Patent Laid-Open No. 64-12044). issue).
【０００４】[0004]
【発明が解決しようとする課題】上記各吸気管固有振動
数変更装置を作動させるソレノイドバルブが正常に作動
しないと、レゾネータチャンバの場合には吸気音が増加
し騒音のもとになり、吸気通路をバイパスする通路の場
合には、出力等の動力性能が低下することになる。とこ
ろが従来はこのソレノイドバルブが正常に作動している
か否かを診断することは行われていなかった。If the solenoid valve for operating the above-mentioned intake pipe natural frequency changing devices does not operate normally, intake noise increases in the case of the resonator chamber, which causes noise, and the intake passage In the case of a passage that bypasses, power performance such as output will be reduced. However, conventionally, it has not been performed to diagnose whether or not this solenoid valve is operating normally.
【０００５】そこで本発明は、上記の問題点に鑑み、上
記ソレノイドバルブが正常に作動しているか否かを判断
できる故障検知装置を提供することを目的とする。In view of the above problems, it is an object of the present invention to provide a failure detection device capable of determining whether or not the solenoid valve is operating normally.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に、請求項１の発明は、吸気管の固有振動数を変化させ
るための吸気管固有振動数変更装置を作動させるソレノ
イドバルブの故障検知装置において、吸気流量を検知す
る流量検知手段と、上記ソレノイドバルブに開閉信号を
出力し、該開閉信号の出力前後における吸気流量の変化
量が所定値以下の場合に該ソレノイドバルブが故障した
ものと判断する故障判断手段とを有することを特徴とす
る。In order to achieve the above object, the invention of claim 1 detects a failure of a solenoid valve for operating an intake pipe natural frequency changing device for changing the natural frequency of the intake pipe. In the device, a flow rate detecting means for detecting an intake flow rate, and an opening / closing signal is output to the solenoid valve, and the solenoid valve fails when a change amount of the intake flow rate before and after the output of the opening / closing signal is less than a predetermined value. It has a failure judging means for judging.
【０００７】また、請求項２の発明は、吸気管の固有振
動数を変化させるための吸気管固有振動数変更装置を作
動させるソレノイドバルブの故障検知装置において、吸
気流量の脈動幅を検知する脈動幅検知手段と、上記ソレ
ノイドバルブに開閉信号を出力し、該開閉信号の出力の
前後における脈動幅の変化量が所定値以下の場合に該ソ
レノイドバルブが故障したものと判断する故障判断手段
とを有することを特徴とする。According to a second aspect of the present invention, in a failure detecting device for a solenoid valve which operates an intake pipe natural frequency changing device for changing the natural frequency of the intake pipe, a pulsation for detecting a pulsation width of an intake flow rate. Width detection means and failure determination means for outputting an opening / closing signal to the solenoid valve and determining that the solenoid valve has failed when the amount of change in the pulsation width before and after the output of the opening / closing signal is less than or equal to a predetermined value. It is characterized by having.
【０００８】[0008]
【作用】請求項１の発明の場合には、上記ソレノイドバ
ルブが正常に作動すると該作動の前後における吸気流量
が変化することに着眼し、吸気流量を検知すると共に、
上記ソレノイドバルブに対して強制的に作動信号を与
え、この作動信号の前後における吸気流量の変化量が、
ソレノイドバルブが正常に作動した場合の変化量に相当
する値以下の場合に、該ソレノイドバルブが故障したも
のと判断するようにした。According to the first aspect of the present invention, it is noted that when the solenoid valve operates normally, the intake air flow rate changes before and after the operation, and the intake air flow rate is detected.
An operation signal is forcibly given to the solenoid valve, and the change amount of the intake flow rate before and after this operation signal is
When the amount of change is equal to or smaller than the amount of change when the solenoid valve operates normally, it is determined that the solenoid valve has failed.
【０００９】また請求項２の発明の場合には、ソレノイ
ドバルブの作動前後における吸気流量があまり変化しな
い場合でも吸気流量の脈動幅が変化することに着眼し、
請求項１の発明の場合と同様に上記ソレノイドバルブに
対して強制的に作動信号を与え、この作動信号の前後に
おける吸気流量の脈動幅の変化量が、ソレノイドバルブ
が正常に作動した場合の脈動幅の変化量に相当する値以
下の場合に、該ソレノイドバルブが故障したものと判断
するようにした。Further, in the case of the second aspect of the invention, it is noted that the pulsation width of the intake flow rate changes even when the intake flow rate before and after the operation of the solenoid valve does not change much.
As in the case of the first aspect of the invention, an operation signal is forcibly applied to the solenoid valve, and the change amount of the pulsation width of the intake air flow before and after the operation signal is the pulsation when the solenoid valve operates normally. When the value is equal to or smaller than the amount of change in width, it is determined that the solenoid valve has failed.
【００１０】[0010]
【実施例】上記吸気管の固有振動数を変化させる形式に
は、吸気管の長さを変えるいわゆる可変管長型と呼ばれ
るものと、吸気管内の容積を変えるいわゆる可変レゾネ
ータ型とがあり、図１のソレノイドバルブ３を用いる構
成と図３に示す構成とを用いて可変管長型について説明
し、図１のソレノイドバルブ２を用いる構成と図４に示
す構成とを用いて可変レゾネータ型について説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS There are two types of types for changing the natural frequency of the intake pipe, a so-called variable pipe length type for changing the length of the intake pipe and a so-called variable resonator type for changing the volume in the intake pipe. The variable pipe length type will be described using the configuration using the solenoid valve 3 and the configuration shown in FIG. 3, and the variable resonator type will be described using the configuration using the solenoid valve 2 in FIG. 1 and the configuration shown in FIG.
【００１１】図１を参照して、１は吸気管路であり、上
流側から順次エアクリーナ１１及びスロットル１２を経
てエンジン１５へと吸気を供給するものである。該吸気
管路１には、スロットル１２の下流にレゾネータチャン
バ１３が設けられ、更に該レゾネータチャンバ１３の下
流にはバイパス通路１４が設けられている。該レゾネー
タチャンバ１３の近傍位置には該レゾネータチャンバ１
３の入口を開閉するソレノイドバルブ２が設けられ、同
じくバイパス通路１４の近傍位置には該バイパス通路１
４の入口を開閉するソレノイドバルブ３が設けられてい
る。Referring to FIG. 1, reference numeral 1 denotes an intake pipe line, which supplies intake air to an engine 15 from an upstream side through an air cleaner 11 and a throttle 12 in order. The intake conduit 1 is provided with a resonator chamber 13 downstream of the throttle 12, and further with a bypass passage 14 downstream of the resonator chamber 13. The resonator chamber 1 is located near the resonator chamber 13.
A solenoid valve 2 for opening and closing the inlet of the bypass passage 3 is provided, and the bypass passage 1 is also provided in the vicinity of the bypass passage 14.
A solenoid valve 3 for opening and closing the inlet of 4 is provided.
【００１２】一方、４はエンジン１５の制御用の電子制
御回路（以下ＥＣＵという）であり、エンジン１５の回
転数ＮEを検知する回転数センサ４１や吸気管内圧ＰBを
検知する圧力センサ４２やスロットル１２の開度ＴHを
検知するスロットル開度センサ４３等のエンジン１５の
運転状態を示すセンサからの信号をＥＣＵ４に入力し
て、エンジン１５の運転状態に応じてソレノイドバルブ
２及びソレノイドバルブ３の開閉状態を制御するように
した。尚、吸気管路１を介してエンジン１５に供給され
る吸気の流量は吸気管内圧力ＰBに比例するので、吸気
流量の変化の状態はＰBの変化として検知することがで
きる。On the other hand, 4 is an electronic control circuit (hereinafter referred to as ECU) for controlling the engine 15, which includes a rotation speed sensor 41 for detecting the rotation speed NE of the engine 15, a pressure sensor 42 for detecting the intake pipe internal pressure PB, and a throttle. A signal from a sensor that indicates the operating state of the engine 15, such as a throttle opening sensor 43 that detects the opening TH of the valve 12, is input to the ECU 4 to open / close the solenoid valves 2 and 3 according to the operating state of the engine 15. The state is controlled. Since the flow rate of intake air supplied to the engine 15 via the intake pipe line 1 is proportional to the intake pipe internal pressure PB, the state of change in the intake flow rate can be detected as a change in PB.
【００１３】ところで、ＥＣＵ４はソレノイドバルブ２
及びソレノイドバルブ３の故障を検知する診断機能を有
しており、ソレノイドバルブ２及びソレノイドバルブ３
の少なくとも一方が故障した時には、その旨を表示器４
４に表示する等のフェールセーフ処理を行うように構成
されている。By the way, the ECU 4 uses the solenoid valve 2
And has a diagnostic function of detecting a failure of the solenoid valve 3, and the solenoid valve 2 and the solenoid valve 3
When at least one of the
4 is configured to perform a fail-safe process such as displaying in 4.
【００１４】ソレノイドバルブ２及びソレノイドバルブ
３の故障検出プログラムは図２に示す通りであり、ＥＣ
Ｕ４内に予め格納されている各所定値ＮE1・ＮE2・ＰB1
・ＰB2・ＤＴHと上記ＮE・ＰB・ＴHとを比較し、エンジ
ン１５の運転状態が所定の状態、即ちＮE1＜ＮE＜ＮE2
・ＰB1＜ＰB＜ＰB2・ΔＴH＜ＤＴHの３つの条件（Ｓ１
・Ｓ２・Ｓ３）が充足されるまでＳ４でタイマｔをリセ
ットし続ける。そして、この３つの条件が充足されると
Ｓ５に進み、タイマｔがスタートしているか否かを判断
する。この時点ではタイマｔはスタートしていないので
Ｓ６に進み、この時点でのＰBをＰM1としてＥＣＵ４内
のメモリに格納する。そして、ソレノイドバルブ２もし
くはソレノイドバルブ３に開閉信号を出力し開閉状態を
反転させると共に（Ｓ７）、タイマｔをスタートさせる
（Ｓ８）。A failure detection program for the solenoid valves 2 and 3 is as shown in FIG.
Predetermined values NE1, NE2, PB1 stored in advance in U4
・ PB2 ・ DTH is compared with the above NE ・ PB ・ TH, and the operating state of the engine 15 is a predetermined state, that is, NE1 <NE <NE2
・ Three conditions of PB1 <PB <PB2 ・ ΔTH <DTH (S1
The timer t is continuously reset in S4 until S2 and S3) are satisfied. Then, when these three conditions are satisfied, the process proceeds to S5, and it is determined whether the timer t has started. Since the timer t has not started at this point, the process proceeds to S6 and PB at this point is stored in the memory in the ECU 4 as PM1. Then, an open / close signal is output to the solenoid valve 2 or the solenoid valve 3 to reverse the open / closed state (S7), and the timer t is started (S8).
【００１５】すると、次回からはＳ５からＳ９に進み、
タイマｔのスタートから所定時間ｔo経過後にＳ１０へ
と進む。このＳ１０では、該Ｓ１０に進んだ時点、即ち
ソレノイドバルブ２もしくはソレノイドバルブ３の開閉
状態がＳ７にて反転されてからｔo経過した時点でのＰB
をＰM2としてＥＣＵ４内のメモリに格納する。そして上
記ＰM1と該ＰM2との差ΔＰMと所定値ＤＰMとを比較し
（Ｓ１２）、ΔＰM＞ＤＰMの条件を満たさない場合に
は、上記Ｓ７にて開閉信号を出力したソレノイドバルブ
が故障したものと判断し（Ｓ１３）、その旨を表示器４
４に表示させる。ところで、図１に示した実施例ではレ
ゾネータチャンバ１３やバイパス通路１４をスロットル
１２の下流に設けたが、図３に示すようにスロットル１
２の上流側に、吸気通路４１に並列のバイパス通路４２
を設け、両通路をレゾネータチャンバ４３を介して連通
すると共に、ソレノイドバルブ４によりバイパス通路４
２の入口を開閉するように構成した場合にも図２に示し
たプログラムを適用することができソレノイドバルブ４
の故障を検知することができる。Then, from the next time, the process proceeds from S5 to S9,
After the lapse of a predetermined time t0 from the start of the timer t, the process proceeds to S10. In S10, PB at the time point when the process proceeds to S10, that is, when the open / closed state of the solenoid valve 2 or the solenoid valve 3 is reversed in S7, to has elapsed.
Is stored in the memory in the ECU 4 as PM2. Then, the difference ΔPM between PM1 and PM2 is compared with a predetermined value DPM (S12). If the condition ΔPM> DPM is not satisfied, it is determined that the solenoid valve that has output the opening / closing signal in S7 has failed. Judgment (S13), to that effect display 4
4 is displayed. By the way, although the resonator chamber 13 and the bypass passage 14 are provided downstream of the throttle 12 in the embodiment shown in FIG. 1, as shown in FIG.
2, the bypass passage 42 parallel to the intake passage 41
Is provided, and both passages are communicated with each other through the resonator chamber 43, and the bypass passage 4 is provided by the solenoid valve 4.
The program shown in FIG. 2 can also be applied to the configuration in which the inlet of 2 is opened and closed.
The failure of can be detected.
【００１６】一方、スロットル１２の上流にレゾネータ
チャンバ５１を設け、該レゾネータチャンバ５１の入口
をソレノイドバルブ５で開閉するように構成した場合に
は、該レゾネータチャンバ１５の入口を開閉しても吸気
流量の変化量が少ないため図２に示すプログラムでは該
ソレノイドバルブ５の故障を検知しにくい。そこで図４
に示すような構成の場合には図５に示すプログラムを用
いてソレノイドバルブ５の故障を検知する。On the other hand, in the case where the resonator chamber 51 is provided upstream of the throttle 12 and the inlet of the resonator chamber 51 is opened and closed by the solenoid valve 5, the intake air flow rate can be maintained even if the inlet of the resonator chamber 15 is opened and closed. 2 is small, it is difficult to detect the failure of the solenoid valve 5 by the program shown in FIG. So Figure 4
In the case of the configuration as shown in FIG. 5, the program shown in FIG. 5 is used to detect the failure of the solenoid valve 5.
【００１７】上記図２の場合と同様に、エンジン１５の
運転状態が所定の状態になるまではタイマｔをリセット
し続け（Ｓ１〜Ｓ４）、エンジン１５の運転状態がＳ１
〜Ｓ３の条件を充足する場合にはＳ１４にてタイマｔを
スタートさせる。そして該タイマｔのスタートからｔ1
経過するまでの間におけるＰBの最大値ＰMAX及び最小値
ＰMINを計測し（Ｓ１６）、両者の差をＰB1としてメモ
リに格納する（Ｓ１７）。そして、ｔ1経過すると開閉
信号を出力しソレノイドバルブ５の開閉状態を反転させ
た後（Ｓ１８）、ｔ2（ｔ1＜ｔ2）経過するまでの間に
おけるＰBの最大値ＰMAX及び最小値ＰMINを計測し（Ｓ
１９・Ｓ２０）、両者の差をＰB2としてメモリに格納す
る（Ｓ２１）。そして、ｔ2経過すればＰB1とＰB2との
差をΔＰB3として（Ｓ２２）、ΔＰB3＞ＤＰBの条件を
満たさない場合にはソレノイドバルブ５が故障したもの
と判断し（Ｓ２３・Ｓ２４）、その旨を表示器４４に表
示させる。As in the case of FIG. 2, the timer t is continuously reset until the operating state of the engine 15 reaches a predetermined state (S1 to S4), and the operating state of the engine 15 is S1.
When the conditions of to S3 are satisfied, the timer t is started in S14. From the start of the timer t, t1
The maximum value PMAX and the minimum value PMIN of PB until the time elapses are measured (S16), and the difference between them is stored in the memory as PB1 (S17). Then, after the elapse of t1, an open / close signal is output to reverse the open / closed state of the solenoid valve 5 (S18), and the maximum value PMAX and the minimum value PMIN of PB are measured until the time t2 (t1 <t2) elapses ( S
19. S20), and the difference between them is stored in the memory as PB2 (S21). When t2 elapses, the difference between PB1 and PB2 is set to ΔPB3 (S22), and when the condition of ΔPB3> DPB is not satisfied, it is determined that the solenoid valve 5 has failed (S23 / S24), and that is displayed. It is displayed on the container 44.
【００１８】この図５に示したプログラムは吸気流量の
脈動幅の変化を基にソレノイドバルブの故障を判断する
ものであるが、該プログラムを上記ソレノイドバルブ２
・３・４の故障を検知する場合にも適用できる。The program shown in FIG. 5 is for judging the malfunction of the solenoid valve based on the change in the pulsation width of the intake flow rate.
-It can also be applied to the case of detecting the failure of 3 and 4.
【００１９】[0019]
【発明の効果】以上の説明から明らかなように、請求項
１の発明によれば、吸気管の固有振動数を変化させるた
めの吸気管固有振動数変更装置を作動させるソレノイド
バルブの故障を、吸気流量の変化量を基に検知すること
ができる。また請求項２の発明によれば、吸気流量の変
化量ではソレノイドバルブの故障を検知しにくい場合で
も、吸気流量の脈動幅の変化量を基にして該ソレノイド
バルブの故障を検知できる。As is apparent from the above description, according to the first aspect of the present invention, the malfunction of the solenoid valve for operating the intake pipe natural frequency changing device for changing the natural frequency of the intake pipe is prevented. It can be detected based on the amount of change in the intake air flow rate. According to the second aspect of the present invention, even when it is difficult to detect the failure of the solenoid valve based on the change amount of the intake flow rate, the failure of the solenoid valve can be detected based on the change amount of the pulsation width of the intake flow rate.
【図１】 請求項１にかかる発明の実施例の構成を示す
図FIG. 1 is a diagram showing a configuration of an embodiment of the invention according to claim 1;
【図２】 吸気流量の変化からソレノイドバルブの故障
を検知するプログラム[FIG. 2] A program for detecting a failure of a solenoid valve from a change in intake flow rate
【図３】 請求項１にかかる発明の他の実施例の構成を
示す図FIG. 3 is a diagram showing a configuration of another embodiment of the invention according to claim 1;
【図４】 請求項２にかかる発明の実施例の構成を示す
図FIG. 4 is a diagram showing a configuration of an embodiment of the invention according to claim 2;
【図５】 吸気流量の脈動幅の変化からソレノイドバル
ブの故障を検知するプログラムFIG. 5 is a program for detecting a solenoid valve failure from changes in the pulsation width of the intake flow rate.
１ 吸気通路 ２・３・４・５ ソレノイドバルブ １３・４３・５１ レゾネータチャンバ １４・４２ バイパス通路 1 Intake passage 2/3/4/5 solenoid valve 13 / 43.51 Resonator chamber 14/4 2 bypass passage
───────────────────────────────────────────────────── フロントページの続き (72)発明者 小池 譲 埼玉県和光市中央１丁目４番１号 株式 会社本田技術研究所内 (72)発明者 丸山 茂 埼玉県和光市中央１丁目４番１号 株式 会社本田技術研究所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Yuzuru Koike, 1-4-1, Chuo, Wako-shi, Saitama, Honda R & D Co., Ltd. (72) Inventor, Shigeru Maruyama 1-1-4, Chuo, Wako, Saitama Honda R & D Co., Ltd.
Claims (2)
吸気管固有振動数変更装置を作動させるソレノイドバル
ブの故障検知装置において、吸気流量を検知する流量検
知手段と、上記ソレノイドバルブに開閉信号を出力し、
該開閉信号の出力前後における吸気流量の変化量が所定
値以下の場合に該ソレノイドバルブが故障したものと判
断する故障判断手段とを有することを特徴とする吸気管
固有振動数変更用ソレノイドバルブの故障検知装置。1. A failure detecting device for a solenoid valve for operating an intake pipe natural frequency changing device for changing the natural frequency of an intake pipe, wherein a flow rate detecting means for detecting an intake flow rate and an opening / closing signal for the solenoid valve. And output
A solenoid valve for changing the natural frequency of an intake pipe, comprising: failure determining means for determining that the solenoid valve has failed when the amount of change in intake air flow before and after the output of the opening / closing signal is less than or equal to a predetermined value. Failure detection device.
吸気管固有振動数変更装置を作動させるソレノイドバル
ブの故障検知装置において、吸気流量の脈動幅を検知す
る脈動幅検知手段と、上記ソレノイドバルブに開閉信号
を出力し、該開閉信号の出力の前後における脈動幅の変
化量が所定値以下の場合に該ソレノイドバルブが故障し
たものと判断する故障判断手段とを有することを特徴と
する吸気管固有振動数変更用ソレノイドバルブの故障検
知装置。2. A pulsation width detecting means for detecting a pulsation width of an intake flow rate in a solenoid valve failure detection device for operating an intake pipe natural frequency changing device for changing a natural frequency of an intake pipe, and the solenoid. An intake valve which outputs an opening / closing signal to the valve, and has a failure judging means for judging that the solenoid valve has failed when the amount of change in the pulsation width before and after the output of the opening / closing signal is less than a predetermined value. Failure detection device for solenoid valve for changing natural frequency of pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13389992A JP2694678B2 (en) | 1992-05-26 | 1992-05-26 | Failure detection device for solenoid valve for changing natural frequency of intake pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13389992A JP2694678B2 (en) | 1992-05-26 | 1992-05-26 | Failure detection device for solenoid valve for changing natural frequency of intake pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05321674A JPH05321674A (en) | 1993-12-07 |
| JP2694678B2 true JP2694678B2 (en) | 1997-12-24 |
Family
ID=15115711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13389992A Expired - Fee Related JP2694678B2 (en) | 1992-05-26 | 1992-05-26 | Failure detection device for solenoid valve for changing natural frequency of intake pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2694678B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6726742B2 (en) | 2001-08-10 | 2004-04-27 | Visteon Global Technologies, Inc. | Air cleaner with a secondary intake |
| DE10346734B3 (en) * | 2003-10-08 | 2005-04-21 | Bayerische Motoren Werke Ag | Method for fault diagnosis with a variable intake manifold in the intake system of an internal combustion engine |
| DE102017209386B4 (en) * | 2017-06-02 | 2024-05-08 | Vitesco Technologies GmbH | Method for determining the current trim of the intake tract of an internal combustion engine during operation |
-
1992
- 1992-05-26 JP JP13389992A patent/JP2694678B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05321674A (en) | 1993-12-07 |
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