JPH01159155U - - Google Patents
Info
- Publication number
- JPH01159155U JPH01159155U JP5449288U JP5449288U JPH01159155U JP H01159155 U JPH01159155 U JP H01159155U JP 5449288 U JP5449288 U JP 5449288U JP 5449288 U JP5449288 U JP 5449288U JP H01159155 U JPH01159155 U JP H01159155U
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- air
- engine
- fuel ratio
- interval time
- 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
- 239000000446 fuel Substances 0.000 claims description 21
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 238000003745 diagnosis Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims 5
- 238000002485 combustion reaction Methods 0.000 claims 2
- 239000000203 mixture Substances 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- 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ブロツク図、第２
図は本考案の一実施例を示すシステム概略図、第
３図は同上実施例における故障診断制御を示すフ
ローチヤート、第４図は燃料噴射弁の断線発生時
の基準信号出力特性を示すタイムチヤート、第５
図は燃料噴射弁の断線による間隔時間変化の様子
を示すグラフである。
１……機関、６……燃料噴射弁、１２……コン
トロールユニツト、１４……クランク角センサ、
１５……水温センサ、１６……Ｏ２センサ、１７
……アイドルスイツチ。
Figure 1 is a block diagram showing the configuration of the present invention;
The figure is a system schematic diagram showing an embodiment of the present invention, Figure 3 is a flowchart showing failure diagnosis control in the above embodiment, and Figure 4 is a time chart showing the reference signal output characteristics when a disconnection occurs in the fuel injection valve. , 5th
The figure is a graph showing how the interval time changes due to disconnection of the fuel injection valve. 1... Engine, 6... Fuel injection valve, 12... Control unit, 14... Crank angle sensor,
15...Water temperature sensor, 16... O2 sensor, 17
...Idol switch.
Claims (1)
当する駆動パルス信号を各気筒毎に備えられた燃
料噴射弁に出力して、機関に燃料を間欠的に噴射
供給するよう構成された電子制御燃料噴射式内燃
機関において、 各気筒のピストンの所定基準位置毎に検出信号
を出力する回転同期信号出力手段と、機関の所定
低回転安定運転状態を検出する判定運転状態検出
手段と、機関排気成分を検出しこれにより機関吸
入混合気の空燃比を検出する空燃比検出手段と、
該空燃比検出手段により検出される機関吸入混合
気の空燃比に基づき実際の空燃比を目標空燃比に
近づけるために燃料増量制御が必要な状態を判定
する増量制御状態判定手段と、前記判定運転状態
検出手段により機関の所定低回転安定運転状態が
検出されかつ前記増量制御状態判定手段により燃
料増量制御が必要な状態が判定されているときに
前記回転同期信号出力手段から出力される検出信
号の間隔時間を計測する間隔時間計測手段と、該
間隔時間計測手段で計測された検出信号間隔時間
の前回値と今回値との比率に基づいて特定気筒の
燃料噴射弁故障を判別する燃料噴射弁故障判別手
段と、を備えて構成されたことを特徴とする電子
制御燃料噴射式内燃機関の燃料噴射弁故障診断装
置。[Scope of claim for utility model registration] A drive pulse signal corresponding to the fuel injection amount set according to the engine operating conditions is output to the fuel injection valve provided for each cylinder to intermittently inject fuel into the engine. In an electronically controlled fuel injection internal combustion engine configured to a detection means; an air-fuel ratio detection means for detecting engine exhaust components and thereby detecting an air-fuel ratio of an engine intake air-fuel mixture;
increasing control state determining means for determining a state in which fuel increasing control is necessary in order to bring the actual air-fuel ratio closer to the target air-fuel ratio based on the air-fuel ratio of the engine intake air-fuel mixture detected by the air-fuel ratio detecting means; A detection signal outputted from the rotation synchronization signal output means when the state detection means detects a stable operating state at a predetermined low rotation speed of the engine and the increase control state determination means determines that a fuel increase control is necessary. An interval time measuring means for measuring an interval time, and a fuel injector failure for determining a fuel injector failure in a specific cylinder based on a ratio between a previous value and a current value of a detection signal interval time measured by the interval time measuring means. 1. A fuel injector failure diagnosis device for an electronically controlled fuel injection type internal combustion engine, comprising: a determining means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5449288U JPH0729235Y2 (en) | 1988-04-25 | 1988-04-25 | Fuel injection valve failure diagnostic device for electronically controlled fuel injection internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5449288U JPH0729235Y2 (en) | 1988-04-25 | 1988-04-25 | Fuel injection valve failure diagnostic device for electronically controlled fuel injection internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01159155U true JPH01159155U (en) | 1989-11-02 |
| JPH0729235Y2 JPH0729235Y2 (en) | 1995-07-05 |
Family
ID=31280420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5449288U Expired - Lifetime JPH0729235Y2 (en) | 1988-04-25 | 1988-04-25 | Fuel injection valve failure diagnostic device for electronically controlled fuel injection internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0729235Y2 (en) |
-
1988
- 1988-04-25 JP JP5449288U patent/JPH0729235Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0729235Y2 (en) | 1995-07-05 |