JPS6390032U

JPS6390032U -

Info

Publication number: JPS6390032U
Application number: JP18530586U
Authority: JP
Priority date: 1986-12-01
Filing date: 1986-12-01
Publication date: 1988-06-11
Anticipated expiration: 2001-12-01
Also published as: JPH0519548Y2

Description

[Brief explanation of drawings]

第１図はこの考案の第１実施例の概略構成図、
第２図はこの実施例のバイパス弁開度特性を示す
線図、第３図はこの実施例の調圧弁特性を示す線
図、第４図はこの実施例の作用を説明する絞り弁
全開時の過給圧特性図である。第５図はこの考案
の第２実施例の概略構成図、第６図はこの実施例
の作動室圧力ＰＢの応答特性を示す線図、第７図
、第８図はそれぞれスイツチ３８がオン、オフ時
のこの実施例の作用を説明する波形図である。第
９図は従来例の概略構成図、第１０図は同じくプ
ーリ比を相違させた場合の絞り弁全開時の過給圧
特性を示す線図である。１……機関本体、３……吸気通路、３Ａ……コ
レクタ部、３Ｂ……過給機上流通路、４……吸気
絞り弁、５……機関駆動式過給機、７……クラン
ク軸プーリ、９……ベルト、１２……バイパス通
路、１３……バイパス弁、１５……ダイヤフラム
アクチユエータ、１５Ａ……ダイヤフラム、１５
Ｄ……作動室、１６……連通路、１７……連通路
、２１……第２のダイヤフラムアクチユエータ、
３１……調圧弁、３１Ａ……ダイヤフラム、３１
Ｄ……作動室、３１Ｅ……調圧室、３１Ｆ……弁
体、３２……連通路、３３……通路、３５Ａ，３
５Ｂ……分岐路、３６……一方向時間遅れ弁、３
７……方向切換弁、３８……切換スイツチ。 FIG. 1 is a schematic diagram of the first embodiment of this invention;
Fig. 2 is a diagram showing the bypass valve opening characteristics of this embodiment, Fig. 3 is a diagram showing the pressure regulating valve characteristics of this embodiment, and Fig. 4 is a diagram showing the operation of this embodiment when the throttle valve is fully open. FIG. 3 is a supercharging pressure characteristic diagram. FIG. 5 is a schematic configuration diagram of a second embodiment of this invention, FIG. 6 is a diagram showing the response characteristics of the working chamber pressure PB of this embodiment, and FIGS. 7 and 8 are respectively when the switch 38 is turned on and FIG. 4 is a waveform diagram illustrating the operation of this embodiment when the switch is off. FIG. 9 is a schematic configuration diagram of a conventional example, and FIG. 10 is a diagram showing supercharging pressure characteristics when the throttle valve is fully opened when the pulley ratios are similarly different. 1... Engine body, 3... Intake passage, 3A... Collector section, 3B... Supercharger upstream passage, 4... Intake throttle valve, 5... Engine-driven supercharger, 7... Crankshaft Pulley, 9...Belt, 12...Bypass passage, 13...Bypass valve, 15...Diaphragm actuator, 15A...Diaphragm, 15
D... Working chamber, 16... Communication path, 17... Communication path, 21... Second diaphragm actuator,
31...Pressure regulating valve, 31A...Diaphragm, 31
D... Working chamber, 31E... Pressure regulating chamber, 31F... Valve body, 32... Communication passage, 33... Passage, 35A, 3
5B... Branch road, 36... One-way time delay valve, 3
7...Directional switching valve, 38...Switching switch.

Claims

[Scope of utility model registration request]

A mechanically driven supercharger installed in an intake passage upstream of an intake throttle valve, a passage bypassing this turbocharger, a bypass valve installed in this passage, and a throttle valve downstream of the turbocharger. a pressure regulating valve that selectively guides the pressure upstream of the supercharger and the pressure downstream of the throttle valve in response to the upstream pressure; and in response to the pressure from the pressure regulating valve, the opening degree of the bypass valve is increased as the pressure decreases. a first diaphragm actuator that increases the opening degree of the bypass valve; and a second diaphragm actuator that operates in conjunction with this actuator and increases the opening degree of the bypass valve as the pressure increases downstream of the turbocharger and upstream of the throttle valve. A supercharging pressure control device for an engine, comprising: a diaphragm actuator.