JPS63158543U

JPS63158543U -

Info

Publication number: JPS63158543U
Application number: JP5158487U
Authority: JP
Priority date: 1987-04-07
Filing date: 1987-04-07
Publication date: 1988-10-18

Description

[Brief explanation of the drawing]

第１図は本考案の構成を示すブロツク図、第２
図は本考案の一実施例を示すターボチヤージヤ付
エンジンのシステム図、第３図は可変ノズルの概
略図、第４図は可変ノズル制御ルーチンのフロー
チヤート、第５図はバイパスバルブ制御ルーチン
のフローチヤート、第６図は補正量設定ルーチン
のフローチヤート、第７図はオーバーブースト圧
変更ルーチンのフローチヤート、第８図は急加速
時の過給圧制御特性図、第９図はオーバーブース
ト圧設定用マツプを示す図である。１……エンジン、２……ターボチヤージヤ、４
……タービン、６……コンプレツサ、１０……可
変ノズル、１２……ＰＣＭバルブ、１３……バイ
パス通路、１４……バイパスバルブ、１６……Ｐ
ＣＭバルブ、１７……コントロールユニツト、２
１……圧力センサ、２２……エアフローメータ、
２３……クランク角センサ。 Figure 1 is a block diagram showing the configuration of the present invention;
The figure is a system diagram of a turbocharged engine showing an embodiment of the present invention, Figure 3 is a schematic diagram of a variable nozzle, Figure 4 is a flowchart of a variable nozzle control routine, and Figure 5 is a flowchart of a bypass valve control routine. , Figure 6 is a flowchart of the correction amount setting routine, Figure 7 is a flowchart of the overboost pressure change routine, Figure 8 is a characteristic diagram of supercharging pressure control during sudden acceleration, and Figure 9 is for overboost pressure setting. FIG. 3 is a diagram showing a map. 1...engine, 2...turbocharger, 4
... Turbine, 6 ... Compressor, 10 ... Variable nozzle, 12 ... PCM valve, 13 ... Bypass passage, 14 ... Bypass valve, 16 ... P
CM valve, 17...Control unit, 2
1...Pressure sensor, 22...Air flow meter,
23...Crank angle sensor.

Claims

[Scope of utility model registration request]

A variable nozzle is provided in the nozzle part of the turbine to control the nozzle area, and a bypass valve is provided in the bypass passage that guides exhaust gas bypassing the turbine, and its opening degree is controlled to achieve the target boost pressure. In a turbocharged engine having a supercharging pressure control means for controlling supercharging pressure, there is provided a sudden acceleration detection means for detecting a sudden acceleration state of the engine, and the target supercharging pressure is set to an overboost pressure for a predetermined period of time when sudden acceleration is detected. and an overboost control means for detecting an engine load, further comprising: a load detection means for detecting an engine load, an integrating means for obtaining an integral value of the detected load, and an overboost for changing the overboost pressure according to the obtained load. A supercharging pressure control device for a turbocharged engine, comprising pressure changing means.