JPH0447155U - - Google Patents
Info
- Publication number
- JPH0447155U JPH0447155U JP8992590U JP8992590U JPH0447155U JP H0447155 U JPH0447155 U JP H0447155U JP 8992590 U JP8992590 U JP 8992590U JP 8992590 U JP8992590 U JP 8992590U JP H0447155 U JPH0447155 U JP H0447155U
- Authority
- JP
- Japan
- Prior art keywords
- opening
- sampling
- exhaust gas
- failure diagnosis
- intake
- 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.)
- Granted
Links
- 238000003745 diagnosis Methods 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 6
- 238000012935 Averaging Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
Description
第１図はこの考案のクレーム対応図、第２図は
この考案の一実施例の構成を示す説明図、第３図
はその故障診断動作を説明するためのフローチヤ
ート、第４図はスロツトル開度のサンプリング値
とその加重平均値の関係を示すタイムチヤート、
第５図は機関回転数と重み係数の関係を示すグラ
フである。
１……絞り弁、２……吸気通路、３……排気還
流通路、４……開閉手段、５……圧力センサ、６
……圧力差検出手段、７……故障診断手段、８…
…スロツトル開度センサ、９……サンプリング手
段、１０……平均化手段、１１……故障診断中止
手段。
Fig. 1 is a complaint correspondence diagram of this invention, Fig. 2 is an explanatory diagram showing the configuration of an embodiment of this invention, Fig. 3 is a flowchart for explaining its failure diagnosis operation, and Fig. 4 is a throttle opening diagram. A time chart showing the relationship between the sampled values and their weighted average values;
FIG. 5 is a graph showing the relationship between engine speed and weighting coefficient. DESCRIPTION OF SYMBOLS 1... Throttle valve, 2... Intake passage, 3... Exhaust recirculation passage, 4... Opening/closing means, 5... Pressure sensor, 6
...Pressure difference detection means, 7...Failure diagnosis means, 8...
...Throttle opening sensor, 9...Sampling means, 10...Averaging means, 11...Fault diagnosis canceling means.
Claims (1)
せる排気還流通路と、この排気還流通路に開閉す
る開閉手段とを備えた排気還流装置において、前
記吸気通路内の吸気圧力を検出する圧力センサと
、前記開閉手段の開動作時の前記吸気圧力とその
閉動作時の前記吸気圧力との差を検出する圧力差
検出手段と、その圧力差に基づいて故障診断を行
う故障診断手段と、前記絞り弁の開度を検出する
スロツトル開度センサと、このスロツトル開度セ
ンサの出力を所定周期でサンプリングするサンプ
リング手段と、このサンプリング手段で得られる
各サンプリング値の移動平均をとる平均化手段と
、この平均化により得られる値が前記開閉手段の
動作期間中に所定値以上変動したか否かを検出し
所定値以上変動すれば前記故障診断を中止させる
故障診断中止手段とを設けたことを特徴とする排
気還流装置の故障診断装置。 In an exhaust recirculation device comprising an exhaust gas recirculation passage that recirculates exhaust gas to an intake passage downstream of a throttle valve, and an opening/closing means that opens and closes the exhaust gas recirculation passage, a pressure sensor that detects intake pressure in the intake passage; pressure difference detection means for detecting a difference between the intake pressure during the opening operation of the opening/closing means and the intake pressure during the closing operation; a failure diagnosis means for diagnosing a failure based on the pressure difference; and the throttle valve. a throttle opening sensor that detects the opening of the throttle opening, a sampling means that samples the output of the throttle opening sensor at a predetermined period, an averaging means that takes a moving average of each sampling value obtained by the sampling means, and an averaging means that takes a moving average of each sampling value obtained by the sampling means; The present invention is characterized by further comprising a failure diagnosis aborting means for detecting whether or not the value obtained by the change has fluctuated by a predetermined value or more during the operation period of the opening/closing means, and for stopping the failure diagnosis if the value has fluctuated by a predetermined value or more. Failure diagnosis device for exhaust gas recirculation equipment.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8992590U JP2518090Y2 (en) | 1990-08-28 | 1990-08-28 | Exhaust gas recirculation device failure diagnosis device |
| US07/750,864 US5137004A (en) | 1990-08-28 | 1991-08-28 | Trouble diagnosis device for EGR system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8992590U JP2518090Y2 (en) | 1990-08-28 | 1990-08-28 | Exhaust gas recirculation device failure diagnosis device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0447155U true JPH0447155U (en) | 1992-04-22 |
| JP2518090Y2 JP2518090Y2 (en) | 1996-11-20 |
Family
ID=31824253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8992590U Expired - Lifetime JP2518090Y2 (en) | 1990-08-28 | 1990-08-28 | Exhaust gas recirculation device failure diagnosis device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2518090Y2 (en) |
-
1990
- 1990-08-28 JP JP8992590U patent/JP2518090Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2518090Y2 (en) | 1996-11-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |