JPH048711U

JPH048711U -

Info

Publication number: JPH048711U
Application number: JP4820190U
Authority: JP
Priority date: 1990-05-10
Filing date: 1990-05-10
Publication date: 1992-01-27

Description

[Brief explanation of drawings]

第１図は本考案の一実施例に係る過給機付エン
ジンのブローバイガス処理装置の系統図、第２図
は第１図の装置の吸気コネクタ部の拡大断面図、
第３図は第１図の装置のエンジン回転数−過給圧
特性図、第４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５
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６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７図は従来の過給機付エンジンの
ブローバイガス処理装置の系統図、第８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９図は第７図のブローバイガス
処理システムを第８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、第１０
図は先に本出願人が提案したシステムの概略構成
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、
４０……吸気コネクタ。 FIG. 1 is a system diagram of a blow-by gas treatment device for a supercharged engine according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of the intake connector part of the device shown in FIG.
Fig. 3 is an engine speed-supercharging pressure characteristic diagram of the device shown in Fig. 1, Fig. 4 is a system diagram showing the flow of blow-by gas during light load operation in the device shown in Fig. 1, and Fig. 5
The figure is a system diagram showing the blow-by gas flow during high-load operation with one turbocharger in the device shown in Figure 1, and the system diagram shown in Figure 6 shows the flow of blow-by gas during high-load operation with two turbochargers in the device shown in Figure 1. Figure 7 is a system diagram of a conventional blow-by gas treatment device for a supercharged engine, Figure 8 is a schematic diagram of an engine employing a conventional two-stage turbo system, and Figure 9 is a system diagram of a blow-by gas treatment device for a conventional supercharged engine. Schematic configuration diagram when the gas treatment system is applied to the two-stage turbo system engine shown in FIG. 8, No. 10
The figure is a schematic configuration diagram of the system previously proposed by the applicant. 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,
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 auxiliary turbocharger's supercharging operation when both are fully closed; In a supercharged engine equipped with an intake bypass passage that guides compressor discharge air to the compressor inlet side of the main turbocharger, a negative pressure side discharge port of the blowby gas passage is communicated with the intake passage downstream of the throttle valve, and the blowby gas passage is connected to the intake passage downstream of the throttle valve. A blow-by gas processing device for a supercharged engine, characterized in that an atmosphere side discharge port of the passage is communicated with the intake bypass passage.