JPH0220728U

JPH0220728U -

Info

Publication number: JPH0220728U
Application number: JP9948788U
Authority: JP
Priority date: 1988-07-26
Filing date: 1988-07-26
Publication date: 1990-02-13
Anticipated expiration: 2003-07-26
Also published as: JPH0544519Y2

Description

[Brief explanation of drawings]

第１図は本考案の実施例における吸気装置の原
理図、第２図はその平面図、第３図は温度感知弁
の特性図、第４図は本考案の切替バルブと従来例
の切替バルブの作動特性を比較して示す図である
。２……過給機、３……サージタンク、４……気
化器、６……インタクーラ、９……切替バルブ、
１０……差圧式アクチユエータ、１１……第１室
、１２……第１圧力導入通路、１３……スロツト
ル弁、１４……第２室、１５……第２圧力導入通
路、１６……第３圧力導入通路、１８……温度感
知弁、２２……エンジン本体、Ａ……ダイレクト
通路、Ｂ……クーラ迂回通路。 Fig. 1 is a principle diagram of the intake system according to the embodiment of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a characteristic diagram of the temperature sensing valve, and Fig. 4 is a switching valve of the invention and a conventional switching valve. FIG. 2...supercharger, 3...surge tank, 4...carburizer, 6...intercooler, 9...switching valve,
10... Differential pressure actuator, 11... First chamber, 12... First pressure introduction passage, 13... Throttle valve, 14... Second chamber, 15... Second pressure introduction passage, 16... Third Pressure introduction passage, 18... Temperature sensing valve, 22... Engine body, A... Direct passage, B... Cooler detour passage.

Claims

[Scope of Claim for Utility Model Registration] (1) The intake passage from the supercharger to the engine body consists of two passages: a cooler bypass passage that goes through an intercooler, and a direct passage that does not go through an intercooler. In an intake system for a supercharged engine equipped with a switching valve that opens one side and closes the other, the actuator of the switching valve is configured with a differential pressure actuator, and a first pressure is applied to a first chamber of the differential pressure actuator. The pressure downstream of the throttle valve is introduced through the introduction passage, while the pressure downstream of the turbocharger is introduced into the second chamber through the second pressure introduction passage, and the second chamber and the first An intake system for a supercharged engine, characterized in that a differential pressure actuator operates so that the cooler bypass passage is closed when the differential pressure between the chamber and the chamber is equal to or higher than a predetermined pressure. (2) The intake passage from the turbocharger to the surge tank consists of two passages: a cooler bypass passage that goes through the intercooler, and a direct passage that directly connects the turbocharger and the surge tank. In an intake system for a supercharged engine equipped with a switching valve that is open and the other closed, the actuator of the switching valve is a differential pressure actuator, and a first pressure introduction passage is provided in a first chamber of the differential pressure actuator. The pressure downstream of the throttle valve is introduced through the throttle valve, while the pressure from a surge tank or a point where pressure equivalent thereto can be introduced is introduced into the second chamber via the second pressure introduction passage, and the temperature sensing device is further introduced into the first chamber. The pressure of a surge tank or a place where pressure equivalent to the surge tank can be introduced is introduced through a third pressure introduction passage that is opened and closed by a valve, and the pressure difference between the second chamber and the first chamber is equal to or higher than a predetermined pressure. A supercharger characterized in that a differential pressure actuator operates to close the cooler bypass passage when the temperature is higher than a predetermined temperature, and a temperature sensing valve operates to open the third pressure introduction passage when the temperature is higher than a predetermined temperature. Intake system for engines with.