JPS6162255U

JPS6162255U -

Info

Publication number: JPS6162255U
Application number: JP14671884U
Authority: JP
Priority date: 1984-09-28
Filing date: 1984-09-28
Publication date: 1986-04-26

Description

[Brief explanation of drawings]

第１図はこの考案のクレーム対応図である。第
２図はこの考案の一実施例であるＥＧＲ装置の機
械的な構成の概略図、第３図はこの実施例の動作
内容を表す流れ図である。第４図は前記実施例の
制御指令値あるいは制御指令値の変化と電磁弁４
２の作動との関係を表す表図、第５図は同じく実
施例のＥＧＲ率と機関運転状態との関係を示す制
御領域図である。第６図はＥＧＲ制御弁に作用す
る負圧とＥＧＲ制御弁の開度の関係を示す説明図
、第７図は考案の効果を従来例との関係において
示す説明図である。第８図は従来のＥＧＲ装置の
機械的な構成の概略図、第９図は同じく従来のＥ
ＧＲ装置の制御指令値と電磁弁の作動及びＥＧＲ
率との関係を表す表図である。２…機関吸気通路、２Ａ…吸気マニホールド、
４Ａ…排気マニホールド、５…ＥＧＲ通路、６…
吸気絞り弁、７…ＥＧＲ制御弁、８…ダイアフラ
ム装置、１０…負圧源、１１Ａ…制御回路、１２
，１６，１７…三方電磁弁、１３…ダイアフラム
装置、１５ａ，１５ｂ，１５ｃ…オリフイス、１
８…負荷センサ、１９…回転センサ、２０…水温
センサ、２１…負圧駆動装置、２２…負圧制御装
置、２３……ＥＧＲ率主制御手段、２４…負荷検
出手段、２５…回転速度検出手段、２６…負圧源
、２７…減圧手段、２８…制御方向検出手段、２
９…減圧停止時間演算手段、３０…減圧停止手段
、４２…電磁弁、４３…オリフイス、４４…負圧
通路。 FIG. 1 is a diagram showing how this invention corresponds to claims. FIG. 2 is a schematic diagram of the mechanical structure of an EGR device that is an embodiment of this invention, and FIG. 3 is a flowchart showing the operation details of this embodiment. FIG. 4 shows the control command value or the change in the control command value and the solenoid valve 4 of the above embodiment.
FIG. 5 is a control area diagram showing the relationship between the EGR rate and the engine operating state in the same embodiment. FIG. 6 is an explanatory diagram showing the relationship between the negative pressure acting on the EGR control valve and the opening degree of the EGR control valve, and FIG. 7 is an explanatory diagram showing the effect of the invention in relation to a conventional example. Fig. 8 is a schematic diagram of the mechanical configuration of a conventional EGR device, and Fig. 9 is a schematic diagram of a conventional EGR device.
GR device control command value, solenoid valve operation, and EGR
It is a table diagram showing the relationship with the rate. 2...Engine intake passage, 2A...Intake manifold,
4A...Exhaust manifold, 5...EGR passage, 6...
Intake throttle valve, 7... EGR control valve, 8... Diaphragm device, 10... Negative pressure source, 11A... Control circuit, 12
, 16, 17... Three-way solenoid valve, 13... Diaphragm device, 15a, 15b, 15c... Orifice, 1
8... Load sensor, 19... Rotation sensor, 20... Water temperature sensor, 21... Negative pressure drive device, 22... Negative pressure control device, 23... EGR rate main control means, 24... Load detection means, 25... Rotation speed detection means , 26... Negative pressure source, 27... Pressure reduction means, 28... Control direction detection means, 2
9... Decompression stop time calculation means, 30... Decompression stop means, 42... Solenoid valve, 43... Orifice, 44... Negative pressure passage.

Claims

[Scope of utility model registration request]

A negative pressure drive device that drives an EGR control valve and an intake throttle valve, respectively, a negative pressure control device that controls in stages the operating negative pressure supplied to the negative pressure drive device, and a negative pressure control device that controls an EGR command value according to the engine operating state. A diesel engine comprising an EGR rate main control means for controlling the EGR rate in multiple stages by outputting to the negative pressure control device,
a pressure reducing means for reducing the negative pressure of the negative pressure source to a predetermined negative pressure;
control direction detection means for detecting a signal for increasing the opening degree of the EGR control valve based on a signal from the main control means; and pressure reduction stop means for stopping the operation of the pressure reduction means for a predetermined period of time when this signal is detected. An exhaust recirculation control device for a diesel engine, characterized by the following: