JPH0259230U

JPH0259230U -

Info

Publication number: JPH0259230U
Application number: JP13780488U
Authority: JP
Priority date: 1988-10-24
Filing date: 1988-10-24
Publication date: 1990-04-27

Description

[Brief explanation of drawings]

第１図は本考案に係る二段ターボエンジンの過
給圧制御装置の一実施例の全体概略構成図、第２
図は排気バイパス弁を駆動する装置の縦断面図、
第３図は制御コンピユータのブロツク回路図、第
４図は第１図に示す装置の過給圧制御の作動の一
例を示すフローチヤート図、第５図は作動ガス量
と過給圧力比との関係を示す図、第６図は水温と
各設定過給圧との関係を示す図、第７図は排気バ
イパス弁を駆動する装置の別の例の縦断面図であ
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、７
……吸気通路、１３……低圧段排気バイパス通路
、１４……高圧段排気バイパス通路、１６……吸
気バイパス通路、２３……ウエイストゲートバル
ブ、２４……排気バイパス弁、２６……吸気バイ
パス弁、３４……排気バイパス弁駆動装置。 FIG. 1 is an overall schematic configuration diagram of an embodiment of a boost pressure control device for a two-stage turbo engine according to the present invention, and FIG.
The figure is a longitudinal cross-sectional view of the device that drives the exhaust bypass valve.
Fig. 3 is a block circuit diagram of the control computer, Fig. 4 is a flowchart showing an example of the boost pressure control operation of the device shown in Fig. 1, and Fig. 5 is a diagram showing the relationship between the working gas amount and the boost pressure ratio. FIG. 6 is a diagram showing the relationship between water temperature and each set supercharging pressure, and FIG. 7 is a longitudinal sectional view of another example of a device for driving an exhaust bypass valve. 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, 7
...Intake passage, 13...Low pressure stage exhaust bypass passage, 14...High pressure stage exhaust bypass passage, 16...Intake bypass passage, 23...Waste gate valve, 24...Exhaust bypass valve, 26...Intake bypass valve , 34...Exhaust bypass valve drive device.

Claims

[Scope of utility model registration request]

An exhaust bypass that bypasses the exhaust turbine of the high-pressure turbocharger, comprising a low-pressure turbocharger that supercharges intake air, and a high-pressure turbocharger that further supercharges the air supercharged by the low-pressure turbocharger and sends it to the engine. In a two-stage turbo engine with an exhaust bypass valve in the passage,
A detection means for detecting cold/warm states of the engine, and based on the detection means, the supercharging pressure of the high pressure turbocharger reaches a boost pressure higher than the set supercharging pressure of the low pressure turbocharger when the engine is cold. and an exhaust bypass that controls the exhaust bypass valve so that it starts to open when the boost pressure of the high-pressure turbocharger reaches a boost pressure that is lower than the set boost pressure of the low-pressure turbocharger when the temperature is warm. A supercharging pressure control device for a two-stage turbo engine, comprising: a valve control means.