JPH0191243U - - Google Patents
Info
- Publication number
- JPH0191243U JPH0191243U JP18688787U JP18688787U JPH0191243U JP H0191243 U JPH0191243 U JP H0191243U JP 18688787 U JP18688787 U JP 18688787U JP 18688787 U JP18688787 U JP 18688787U JP H0191243 U JPH0191243 U JP H0191243U
- Authority
- JP
- Japan
- Prior art keywords
- pulse signal
- unit
- serial communication
- pulses
- communication means
- 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
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 239000000446 fuel Substances 0.000 claims description 2
- 230000005856 abnormality Effects 0.000 claims 1
- 238000007689 inspection Methods 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 claims 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Testing Of Engines (AREA)
Description
第１図はこの考案に係るエンジン制御システム
の診断装置の一実施例を示す構成説明図、第２図
はその車載ユニツト内の各信号を示すタイムチヤ
ート、第３図は外部診断ユニツトにおける診断プ
ログラムの該略を示すフローチヤートである。
１……車載ユニツト、７……シリアル通信回路
、１３……プリセツトタイマ、１４……駆動回路
、１５……燃料噴射弁、１６……モニタ回路、１
７……カウンタ、１８……シリアル通信ライン、
１９……外部診断ユニツト。
Fig. 1 is a configuration explanatory diagram showing one embodiment of a diagnostic device for an engine control system according to this invention, Fig. 2 is a time chart showing each signal in the in-vehicle unit, and Fig. 3 is a diagnostic program in an external diagnostic unit. This is a flowchart showing the outline of. DESCRIPTION OF SYMBOLS 1... Vehicle-mounted unit, 7... Serial communication circuit, 13... Preset timer, 14... Drive circuit, 15... Fuel injection valve, 16... Monitor circuit, 1
7...Counter, 18...Serial communication line,
19...External diagnosis unit.
Claims (1)
する車載ユニツトと、点検作業時に上記車載ユニ
ツトに対しシリアル通信手段を介して接続可能な
外部診断ユニツトとから構成され、かつ上記車載
ユニツトは、上記噴射パルス信号をモニタして該
噴射パルス信号の所定単位時間内の出力回数をカ
ウントするカウンタ手段を備え、また上記外部診
断ユニツトは、上記シリアル通信手段を介して入
力されたエンジン回転数情報に基づいて単位時間
当たりの基準パルス数を演算する手段と、上記シ
リアル通信手段を介して順次入力される上記カウ
ンタ手段のカウント数を上記基準パルス数と比較
して、噴射パルス数の異常判定を行う手段とを備
えてなるエンジン制御システムの診断装置。 It consists of an on-vehicle unit that controls the injection pulse signal applied to the fuel injection valve, and an external diagnostic unit that can be connected to the on-vehicle unit via a serial communication means during inspection work, and the on-vehicle unit controls the injection pulse signal. The external diagnostic unit is equipped with a counter means for monitoring the pulse signal and counting the number of times the injection pulse signal is output within a predetermined unit time, and the external diagnostic unit is configured to detect the engine speed based on the engine rotation speed information input via the serial communication means. means for calculating a reference number of pulses per unit time; and means for determining an abnormality in the number of injection pulses by comparing the count number of the counter means, which is sequentially input via the serial communication means, with the reference number of pulses; A diagnostic device for engine control systems.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18688787U JPH0191243U (en) | 1987-12-08 | 1987-12-08 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18688787U JPH0191243U (en) | 1987-12-08 | 1987-12-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0191243U true JPH0191243U (en) | 1989-06-15 |
Family
ID=31699789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18688787U Pending JPH0191243U (en) | 1987-12-08 | 1987-12-08 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0191243U (en) |
-
1987
- 1987-12-08 JP JP18688787U patent/JPH0191243U/ja active Pending
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