JPS5986351U

JPS5986351U - Diesel engine exhaust recirculation device

Info

Publication number: JPS5986351U
Application number: JP18380082U
Authority: JP
Inventors: 松岡　孟; 佐原　正憲
Original assignee: マツダ株式会社
Priority date: 1982-12-02
Filing date: 1982-12-02
Publication date: 1984-06-11

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は本考案実施例に係るディーゼルエンジンの排気
還流装置のシステム図、第２図は第１図の排気還流装置
の基本制御フロチャート、第３図は排気還流装置の作動
領域を示す線図、第４図はエンジンの運転状態に対する
基本噴射時期曲線、第５図はエンビンの運転状態に対す
る目標負圧曲線、第６図はエンジンの運転状態に対する
噴射角の補正量曲線、第７図は燃料の噴射時期ｔｒ”一
対する排気成分の濃度変化曲線である。１・・・・・・吸気通路、２・・・・・・排気通路、３
・・・：・・排気還流管、４・・・・・・絞り弁、８′
・・・・・・燃料噴射弁、９・・・・・・ＥＧＲ弁、１
１・・・・・・開度調整装置、１４・・曲三方切換弁、
１５・・胃・デユーティバルブ、１７・・・・・・真空
ポンプ、２１・・・・・・補正回路、２２・・・・・・
故障検出装置。Fig. 1 is a system diagram of the exhaust recirculation device for a diesel engine according to an embodiment of the present invention, Fig. 2 is a basic control flowchart of the exhaust recirculation device of Fig. 1, and Fig. 3 is a line showing the operating range of the exhaust recirculation device. Figure 4 shows the basic injection timing curve for engine operating conditions, Figure 5 shows the target negative pressure curve for engine operating conditions, Figure 6 shows the injection angle correction amount curve for engine operating conditions, and Figure 7 shows the injection angle correction amount curve for engine operating conditions. These are concentration change curves of exhaust components with respect to fuel injection timing tr. 1... Intake passage, 2... Exhaust passage, 3
... : ... Exhaust recirculation pipe, 4 ... Throttle valve, 8'
...Fuel injection valve, 9...EGR valve, 1
1... Opening adjustment device, 14... Curved three-way switching valve,
15... Stomach/duty valve, 17... Vacuum pump, 21... Correction circuit, 22...
Fault detection device.

Claims

[Scope of utility model registration request]

Suitable for diesel engine intake and exhaust passages.
A throttle valve with a variable opening degree is installed in the intake passage at a position on the intake upstream side of the opening position of the exhaust gas flow pipe, and changes in the negative pressure generated by the throttle valve are provided. An exhaust recirculation device for a diesel engine, which controls the amount of recirculation of exhaust gas recirculated from the exhaust passage to the intake passage side via the exhaust recirculation pipe, the actual exhaust recirculation amount and the required exhaust recirculation amount of the engine. a deviation detection device that detects when a deviation of the deviation exceeds a predetermined value;
When the above exhaust recirculation amount deviation is detected, if the actual exhaust recirculation amount is less than the engine's required exhaust recirculation amount, the fuel injection timing will be changed to a value higher than the basic injection timing set based on the current engine operating condition. It is characterized by a correction circuit that delays the fuel injection timing by an appropriate angle and advances the fuel injection timing by an appropriate angle when the actual exhaust gas recirculation amount is greater than the engine's required exhaust recirculation amount. Exhaust recirculation system for diesel engines.