JPH0256860U

JPH0256860U -

Info

Publication number: JPH0256860U
Application number: JP13659888U
Authority: JP
Priority date: 1988-10-19
Filing date: 1988-10-19
Publication date: 1990-04-24

Description

[Brief explanation of drawings]

第１図は本考案によるエアーフローセンサの概
略断面図、第２図は空気流量と要求差圧との関係
を示す図、第３図は従来の燃料供給装置の概略断
面図、第４図は先行技術に係る定負圧型気化器の
要部断面図である。２……エアバルブ、１４……アクチユエータ、
１６……負圧室、２０……サーボバルブ、２１…
…第二負圧導入通路、２２……第二負圧室、３０
……オリフイス、３１……大気印加通路、３２…
…ニードルバルブ、３３……リンク機構。 Figure 1 is a schematic sectional view of the air flow sensor according to the present invention, Figure 2 is a diagram showing the relationship between air flow rate and required differential pressure, Figure 3 is a schematic sectional view of a conventional fuel supply device, and Figure 4 is a diagram showing the relationship between air flow rate and required differential pressure. FIG. 2 is a sectional view of a main part of a constant negative pressure type vaporizer according to the prior art. 2... Air valve, 14... Actuator,
16... Negative pressure chamber, 20... Servo valve, 21...
...Second negative pressure introduction passage, 22...Second negative pressure chamber, 30
... Orifice, 31 ... Atmospheric application passage, 32 ...
...Needle valve, 33...Link mechanism.

Claims

[Claims for Utility Model Registration] (1) An air valve that is provided in an intake passage and controls the air flow rate by its opening degree, and the air valve is opened and closed by the pressure of a first negative pressure chamber that communicates with the downstream side of the air valve. A second negative pressure chamber communicating with the actuator and the downstream side of the air valve via an orifice is separated from a second atmospheric chamber via a diaphragm, and the second negative pressure chamber of the actuator A servo valve that controls the amount of atmospheric pressure applied to the first negative pressure chamber, and a servo valve that is provided in a passage that communicates the second negative pressure chamber and the upstream side of the air valve, and that controls the opening area of the passage in conjunction with the opening and closing operations of the air valve. The air flow sensor is provided with an opening/closing means for controlling the air valve, and is configured to generate a differential pressure depending on the air flow rate between the upstream side and the downstream side of the air valve. (2) The air flow sensor according to claim (1), wherein the orifice and the opening/closing means are arranged at opposite positions.