JPH02131030U

JPH02131030U -

Info

Publication number: JPH02131030U
Application number: JP3794289U
Authority: JP
Priority date: 1989-04-03
Filing date: 1989-04-03
Publication date: 1990-10-30

Description

[Brief explanation of the drawing]

第１図は本考案に係る二段ターボエンジンの過
給制御装置の一実施例の全体概略構成図、第２図
は本考案の要部を成す排気バイパス弁の他の実施
例を示す断面図である。１……エンジン、２……排気通路、３……低圧
段タービン、４……高圧段タービン、５……低圧
段コンプレツサ、６……高圧段コンプレツサ、１
４……排気バイパス通路、２４……主排気バイパ
ス弁（ポペツト型）、２５……副排気バイパス弁
（ポペツト型）、２７……排気バイパス弁（フラ
ツタ型）、３０，３４，３５……アクチユエータ
、３７，３８……電磁式三方弁。 Fig. 1 is an overall schematic configuration diagram of one embodiment of the supercharging control device for a two-stage turbo engine according to the present invention, and Fig. 2 is a cross-sectional view showing another embodiment of the exhaust bypass valve that forms the main part of the present invention. It is. DESCRIPTION OF SYMBOLS 1...Engine, 2...Exhaust passage, 3...Low pressure stage turbine, 4...High pressure stage turbine, 5...Low pressure stage compressor, 6...High pressure stage compressor, 1
4... Exhaust bypass passage, 24... Main exhaust bypass valve (poppet type), 25... Sub-exhaust bypass valve (poppet type), 27... Exhaust bypass valve (flutter type), 30, 34, 35... Actuator , 37, 38... Solenoid three-way valve.

Claims

[Scope of utility model registration request]

In a two-stage turbocharged engine having a low-pressure turbocharger that pressurizes intake air and a high-pressure turbocharger that further pressurizes the air pressurized by the low-pressure turbocharger and sends it to the engine, the exhaust turbine of the high-pressure turbocharger is Two main and sub-bypass valves with different valve diameters are installed in parallel in the detouring exhaust bypass passage, and the small-diameter sub-bypass valve responds to changes in the outlet side pressure of the high-pressure compressor in the low and medium speed range of the engine. The valve opening degree is adjusted to control (maintain) the pressure at the target value, and the large diameter main bypass valve is fully opened at once after the outlet side pressure of the low pressure stage compressor reaches the target value in the high speed range of the engine. A supercharging pressure control device characterized in that the supercharging pressure control device is configured to switch to one-stage supercharging using a low-pressure stage turbocharger.