JPS5896049U

JPS5896049U - Internal combustion engine exhaust recirculation control device

Info

Publication number: JPS5896049U
Application number: JP19135481U
Authority: JP
Inventors: 正雄中島; 川村　佳久; 塩山　議市; 豊昭中川
Original assignee: 日産自動車株式会社
Priority date: 1981-12-22
Filing date: 1981-12-22
Publication date: 1983-06-29

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図は従来例の概略構成図、第２図はその回転速度と
負荷との関係との関係で排気還流量の制御特性を表わし
た特性線図、第３図は第２図の任意の回転速度について
負荷とＥＧＲガス流量との関係を表わした特性線図であ
る。第４図は禾考案の一実施例の概略構成図、第５図は
その制御回路の動作ルーチンを示す流れ図である。第６
図〜第８図は、それぞれ実施例のＥＧＲ制御弁、吸気絞
り弁、排気絞り弁の開度特性を回転速度と負荷との関係
で表わした特性線図、第９図は同じく前記各弁の開度を
変化させたときのＮＯｘとＨＣの排出特性を表わした特
性線図である。２・・・・・・吸気通路、−３・・・・・・機関本体、
４・・・・・・排気通路、５・・・・・・ＥＧＲ通路、
６・・・・・・吸気絞り弁、７・・・・・・ＥＧＲ制御
弁、８・・・・・・第１のダイアフラム装置、９・・・
・・・負圧源、１２・・・・・・第２のダイアフラム装
置、１４・・・・・・負荷センサ、１５・・・・・・回
転センサ、１Ｂ・・・・・・排気絞り弁、１９・・・・
・・第３のダイアフラム装置、２０．　２１．　２２・
・・・・・負圧制御弁、２３・・・・・・制御回路。Figure 1 is a schematic configuration diagram of a conventional example, Figure 2 is a characteristic diagram showing the control characteristics of the exhaust gas recirculation amount in relation to the relationship between rotational speed and load, and Figure 3 is an arbitrary diagram of the conventional example. FIG. 3 is a characteristic diagram showing the relationship between load and EGR gas flow rate with respect to rotational speed. FIG. 4 is a schematic configuration diagram of one embodiment of the invention, and FIG. 5 is a flowchart showing the operation routine of the control circuit. 6th
8 to 8 are characteristic diagrams showing the opening characteristics of the EGR control valve, intake throttle valve, and exhaust throttle valve of the example in relation to the rotational speed and load, and FIG. 9 is a characteristic diagram of the respective valves. FIG. 3 is a characteristic diagram showing the emission characteristics of NOx and HC when the opening degree is changed. 2...Intake passage, -3... Engine body,
4...Exhaust passage, 5...EGR passage,
6... Intake throttle valve, 7... EGR control valve, 8... First diaphragm device, 9...
... Negative pressure source, 12 ... Second diaphragm device, 14 ... Load sensor, 15 ... Rotation sensor, 1B ... Exhaust throttle valve , 19...
...Third diaphragm device, 20. 21. 22・
... Negative pressure control valve, 23 ... Control circuit.

Claims

[Scope of utility model registration request]

An EGR system in which an intake throttle valve driven via a first diaphragm device is interposed in the middle of an engine intake passage, and an intake passage downstream of the intake throttle valve communicates with an exhaust passage.
In an internal combustion engine in which an EdR control valve driven via a second diaphragm device is interposed in the middle of the EGR passage, an EdR control valve is located in the middle of the exhaust passage downstream of the opening of the EGR passage. and an exhaust throttle valve driven via a third diaphragm device,
A load sensor that detects the load state of the engine, a rotation sensor that also detects the rotation speed, and a negative pressure control valve that independently adjusts the operating negative pressure supplied to each of the diaphragm and flam devices;
An exhaust gas recirculation control device for an internal combustion engine, comprising: a control circuit for duty-controlling the negative pressure control valve based on signals from each of the sensors.