JPS62130129U

JPS62130129U -

Info

Publication number: JPS62130129U
Application number: JP1857586U
Authority: JP
Priority date: 1986-02-10
Filing date: 1986-02-10
Publication date: 1987-08-17

Description

[Brief explanation of the drawing]

第１図〜第７図はこの考案に係る可変容量ター
ボチヤージヤの一実施例を示した図であり、第１
図はその全体構成図、第２図はその制御系を示す
図、第３図はその制御プログラムを示すフローチ
ヤート、第４図は吸入空気量とデユテイ値との関
係を示す図、第５図は吸入空気量と目標過給圧と
の関係を示す図、第６図はこの考案の動作を説明
するための説明図、第７図は運転領域を説明する
説明図、第８図は従来の可変容量ターボチヤージ
ヤを示す全体図である。２１……エンジン、２２……主ターボチヤージ
ヤ、２３……副ターボチヤージヤ、２４……吸気
通路、２５……排気通路、２６……排気（高圧）
タービン、２７……第１（主）バイパス通路、２
８……第２（副）バイパス通路、２９……排気バ
イパス弁（流量調整手段）、３０……流量調整弁
（流量調整手段）、３１……触媒装置。 Figures 1 to 7 are diagrams showing one embodiment of the variable displacement turbocharger according to this invention.
Figure 2 is a diagram showing its overall configuration, Figure 2 is a diagram showing its control system, Figure 3 is a flow chart showing its control program, Figure 4 is a diagram showing the relationship between intake air amount and duty value, and Figure 5 is a diagram showing the relationship between intake air amount and duty value. is a diagram showing the relationship between intake air amount and target boost pressure, Figure 6 is an explanatory diagram to explain the operation of this invention, Figure 7 is an explanatory diagram to explain the operating range, and Figure 8 is the conventional diagram. FIG. 2 is an overall view showing a variable displacement turbocharger. 21...Engine, 22...Main turbocharger, 23...Sub-turbocharger, 24...Intake passage, 25...Exhaust passage, 26...Exhaust (high pressure)
Turbine, 27...first (main) bypass passage, 2
8... Second (sub) bypass passage, 29... Exhaust bypass valve (flow rate adjustment means), 30... Flow rate adjustment valve (flow rate adjustment means), 31... Catalyst device.

Claims

[Scope of utility model registration request]

In a multi-stage turbocharged engine in which a main turbocharger and a sub-turbocharger are interposed in the intake passage of the engine and a sub-turbocharger downstream thereof, the exhaust turbine of the sub-turbocharger is bypassed in the exhaust passage. A main bypass passage and a sub-bypass passage are provided, and each of these bypass passages is provided with a flow rate adjustment means, and a catalyst device is interposed in the sub-bypass passage, so that only the sub-bypass passage is provided in a predetermined low load range of the engine. An engine equipped with a multi-stage turbo supercharger, which is characterized by being operated in open mode.