JPH048712U

JPH048712U -

Info

Publication number: JPH048712U
Application number: JP4820290U
Authority: JP
Priority date: 1990-05-10
Filing date: 1990-05-10
Publication date: 1992-01-27
Anticipated expiration: 2005-05-10
Also published as: JP2503660Y2

Description

[Brief explanation of the drawing]

第１図は本考案の第１実施例に係る過給機付エ
ンジンの系統図、第２図は第１図の装置のエンジ
ン回転数−過給圧特性図、第３図は第１図の装置
における軽負荷運転時のブローバイガスの流れを
示す系統図、第４図は第１図の装置における１個
ターボチヤージヤ高負荷運転時のブローバイガス
の流れを示す系統図、第５図は第１図の装置にお
ける２個ターボチヤージヤ高負荷運転時のブロー
バイガスの流れを示す系統図、第６図は本考案の
第２実施例に係る過給機付エンジンの系統図、第
７図は第６図の装置の吸気コネクタ部の拡大断面
図、第８図は従来の過給機付エンジンの系統図、
第９図は従来の２ステージターボシステムを採用
したエンジンの概略系統図、第１０図は第８図に
示したシステムを第９図の２ステージターボシス
テムエンジンに適用した場合の概略構成図、であ
る。１……エンジン、２……サージタンク、３……
排気マニホルド、４……スロツトル弁、５……ス
ロツトル開度センサ、６……インタークーラ、７
……主ターボチヤージヤ、７ｂ……主ターボチヤ
ージヤのコンプレツサ、８……副ターボチヤージ
ヤ、８ｂ……副ターボチヤージヤのコンプレツサ
、１０……吸気バイパス弁のアクチユエータ、１
１……吸気切替弁のアクチユエータ、１３……吸
気バイパス通路、１４……吸気通路（コンプレツ
サ下流）、１４ａ……スロツトル弁下流の吸気通
路、１５……吸気通路（コンプレツサ上流）、１
５ａ……主ターボチヤージヤ用吸気通路、１５ｂ
……副ターボチヤージヤ用吸気通路、１６……排
気切替弁のアクチユエータ、１７……排気切替弁
、１８……吸気切替弁、２４……エアフローメー
タ、２５……第１の三方電磁弁、２６……第２の
三方電磁弁、２７……第３の三方電磁弁、２８…
…第４の三方電磁弁、２９……エンジンコントロ
ールコンピユータ、３０……吸気管圧力センサ、
３１……ウエストゲートバルブ、３２……オリフ
イス、３３……吸気バイパス弁、３４……ブロー
バイガス通路、３４ａ……負圧側放出口、３４ｂ
……大気側放出口、３５……クランクケース内、
３６……アイドルスピードコントロールバルブ、
３６ａ……大気導入口、３６ｂ……入口ポート、
３７……ホース、４０……吸気コネクタ。 FIG. 1 is a system diagram of a supercharged engine according to the first embodiment of the present invention, FIG. 2 is an engine speed-supercharging pressure characteristic diagram of the device shown in FIG. 1, and FIG. Figure 4 is a system diagram showing the flow of blow-by gas during light-load operation in the device; Figure 4 is a system diagram showing the flow of blow-by gas during high-load operation of the single turbocharger in the equipment shown in Figure 1; Figure 5 is the system diagram shown in Figure 1. FIG. 6 is a system diagram showing the flow of blow-by gas during high-load operation of the two turbochargers in the device shown in FIG. An enlarged sectional view of the intake connector part of the device, Figure 8 is a system diagram of a conventional supercharged engine,
Fig. 9 is a schematic system diagram of an engine employing a conventional two-stage turbo system, and Fig. 10 is a schematic diagram of the system when the system shown in Fig. 8 is applied to the two-stage turbo system engine shown in Fig. 9. be. 1...Engine, 2...Surge tank, 3...
Exhaust manifold, 4... Throttle valve, 5... Throttle opening sensor, 6... Intercooler, 7
...Main turbocharger, 7b...Main turbocharger compressor, 8...Sub-turbocharger, 8b...Sub-turbocharger compressor, 10...Intake bypass valve actuator, 1
DESCRIPTION OF SYMBOLS 1... Actuator of the intake switching valve, 13... Intake bypass passage, 14... Intake passage (downstream of the compressor), 14a... Intake passage downstream of the throttle valve, 15... Intake passage (upstream of the compressor), 1
5a...Intake passage for main turbocharger, 15b
...Intake passage for sub-turbocharger, 16... Actuator of exhaust switching valve, 17... Exhaust switching valve, 18... Intake switching valve, 24... Air flow meter, 25... First three-way solenoid valve, 26... Second three-way solenoid valve, 27...Third three-way solenoid valve, 28...
...Fourth three-way solenoid valve, 29...Engine control computer, 30...Intake pipe pressure sensor,
31... Waste gate valve, 32... Orifice, 33... Intake bypass valve, 34... Blow-by gas passage, 34a... Negative pressure side discharge port, 34b
...Atmospheric side discharge port, 35...Inside the crankcase,
36...Idle speed control valve,
36a...atmosphere inlet, 36b...inlet port,
37...Hose, 40...Intake connector.

Claims

[Scope of utility model registration request]

A blowby gas passage that guides blowby gas from inside the crankcase to the engine intake system, a main turbocharger and a sub-turbocharger installed in parallel with the engine body, and an intake and exhaust system of the engine connected to the sub-turbocharger. , an intake switching valve and an exhaust switching valve that cause the auxiliary turbocharger to perform supercharging operation when both are fully open, and stop the supercharging operation of the auxiliary turbocharger when both are fully closed; The negative pressure side discharge port of the blow-by gas passage is connected to the intake passage downstream of the throttle valve, and the atmosphere side discharge port of the blow-by gas passage is branched from the intake passage communicating with the sub-turbocharger. It is characterized in that it communicates with the intake passage upstream of the compressor, and the atmosphere inlet to the idle speed control valve communicates with the intake passage upstream of the compressor of the auxiliary turbocharger after branching from the intake passage communicating with the main turbocharger. A supercharged engine.