JPH02145643U - - Google Patents
Info
- Publication number
- JPH02145643U JPH02145643U JP5526689U JP5526689U JPH02145643U JP H02145643 U JPH02145643 U JP H02145643U JP 5526689 U JP5526689 U JP 5526689U JP 5526689 U JP5526689 U JP 5526689U JP H02145643 U JPH02145643 U JP H02145643U
- Authority
- JP
- Japan
- Prior art keywords
- minimum value
- air flow
- flow rate
- intake air
- operating region
- 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
- 238000001514 detection method Methods 0.000 claims description 4
- 238000009499 grossing Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
Landscapes
- Testing Of Engines (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Description
第１図は本考案の構成を示す機能ブロツク図、
第２図は本考案の一実施例を示すシステム図、第
３図は故障検出ルーチンのフローチヤート、第４
図は学習ルーチンにおけるイニシヤルルーチンの
フローチヤート、第５図は学習ルーチンにおける
更新ルーチンのフローチヤート、第６図は従来の
熱線式流量計の回路構成図、第７図は平滑回路の
回路構成図、第８図は従来の問題点及び本考案に
係る作用を説明する図である。
１……エアフローメータ、２……コントロール
ユニツト、３……平滑回路、５……マイクロコン
ピユータ、６……クランク角センサ、７……スロ
ツトルセンサ。
Figure 1 is a functional block diagram showing the configuration of the present invention.
Fig. 2 is a system diagram showing an embodiment of the present invention, Fig. 3 is a flowchart of a failure detection routine, and Fig. 4 is a system diagram showing an embodiment of the present invention.
The figure is a flowchart of the initial routine in the learning routine, Figure 5 is a flowchart of the update routine in the learning routine, Figure 6 is a circuit diagram of a conventional hot wire flowmeter, and Figure 7 is a circuit diagram of a smoothing circuit. , FIG. 8 is a diagram illustrating the conventional problems and the effects of the present invention. 1... Air flow meter, 2... Control unit, 3... Smoothing circuit, 5... Microcomputer, 6... Crank angle sensor, 7... Throttle sensor.
Claims (1)
り吸入空気流量に応じて出力される電圧を平滑回
路を介して読込むことにより吸入空気流量を検出
する吸入空気流量検出装置の故障を検出する装置
であつて、 機関回転数と機関負荷とにより区分けされる運
転領域ごとに予め吸入空気流量の最小値を記憶さ
せた書換え可能な最小値記憶手段と、 機関回転数と機関負荷とを検出して実際の運転
領域を検出する運転領域検出手段と、 前記最小値記憶手段から前記運転領域検出手段
により検出された運転領域に対応する吸入空気流
量の最小値を検索する最小値検索手段と、 前記吸入空気流量検出装置により検出された吸
入空気流量と前記最小値検索手段により検索され
た最小値とを比較して、吸入空気流量の検出値が
最小値より所定値以上小さい場合に故障と判定す
る故障判定手段と、 前記吸入空気流量検出装置により検出された吸
入空気流量と前記最小値検索手段により検索され
た最小値とを比較して、吸入空気流量の検出値が
最小値より小さい場合に当該検出値を最小値とし
て前記最小値記憶手段と対応する運転領域の最小
値のデータを書換える最小値更新手段と、 を備えたことを特徴とする吸入空気流量検出装置
の故障検出装置。[Scope of Claim for Utility Model Registration] An intake air flow rate detection device that detects the intake air flow rate by reading the voltage output according to the intake air flow rate from an air flow meter installed in the engine intake passage through a smoothing circuit. A device for detecting a failure of the engine, the device comprising: a rewritable minimum value storage means that stores in advance the minimum value of the intake air flow rate for each operating region divided by engine speed and engine load; an operating region detecting means for detecting the actual operating region by detecting the load; and a minimum value for searching the minimum value storage means for the minimum value of the intake air flow rate corresponding to the operating region detected by the operating region detecting means. A search means compares the intake air flow rate detected by the intake air flow rate detection device with the minimum value searched by the minimum value search means, and if the detected value of the intake air flow rate is smaller than the minimum value by a predetermined value or more. a failure determination means for determining a failure when the intake air flow rate is determined to be a failure; a minimum value updating means for rewriting the minimum value data of the operating region corresponding to the minimum value storage means by setting the detected value as a minimum value when the detected value is smaller than the minimum value; Detection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5526689U JPH02145643U (en) | 1989-05-16 | 1989-05-16 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5526689U JPH02145643U (en) | 1989-05-16 | 1989-05-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02145643U true JPH02145643U (en) | 1990-12-11 |
Family
ID=31578061
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5526689U Pending JPH02145643U (en) | 1989-05-16 | 1989-05-16 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02145643U (en) |
-
1989
- 1989-05-16 JP JP5526689U patent/JPH02145643U/ja active Pending
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