JPH0352380U

JPH0352380U -

Info

Publication number: JPH0352380U
Application number: JP11334989U
Authority: JP
Priority date: 1989-09-29
Filing date: 1989-09-29
Publication date: 1991-05-21

Description

[Brief explanation of drawings]

第１図は本考案による燃料噴射装置の一実施例
を示す概略断面図、第２図は流入側電磁弁と消費
側電磁弁のエンジン回転数とデユーテイ比の関係
を示す図、第３図は流入側電磁弁と消費側電磁弁
の各開口面積に応じた、燃圧Ｐ_ａに対する燃料流
量Ｑ_ｃ，Ｑ_ｄを示す図、第４図は分圧した場合と
しない場合の、吸入負圧Ｐ_ｍと燃圧Ｐ_ａとの関係
を示す図、第５図は吸入負圧Ｐ_ｍと分圧吸入負圧
Ｐ′_ｍとの関係を示す図、第６図は吸入負圧Ｐ_ｍとエンジン回転数に応じた要求燃料流量Ｑを示す
図、第７図は燃料噴射装置の変形例を示す要部断
面図である。２，３３……燃圧レギユレータ、９，９′，９
′，９′……ブリツジ流路、１０……ダイアフラ
ム、１１……上室、１２……下室、１２ａ……吐
出口、１３……バルブ、１４……第一ジエツト、
１５……第二ジエツト、１６……第三ジエツト、
１７……第四ジエツト、２２……第一燃料通路、
２３……流入側電磁弁、２４……第二燃料通路、
２５……消費側電磁弁、２８……エア通路、２９
……アシストエアジエツト、３０……分圧ジエツ
ト、３１……分圧手段。 FIG. 1 is a schematic sectional view showing an embodiment of the fuel injection device according to the present invention, FIG. 2 is a diagram showing the relationship between the engine speed and duty ratio of the inflow-side solenoid valve and the consumption-side solenoid valve, and FIG. A diagram showing the fuel flow rates Q _c and Q _d with respect to the fuel pressure P _a according to the opening areas of the inlet side solenoid valve and the consumption side solenoid valve. Figure 4 shows the suction negative pressure P _m with and without partial pressure. Figure 5 is a diagram showing the relationship between suction negative pressure P _m and partial pressure suction negative pressure P' _m , and Figure 6 is a diagram showing the relationship between suction negative pressure P m _{and fuel pressure P a} _. FIG. 7 is a cross-sectional view of a main part showing a modification of the fuel injection device. 2, 33...Fuel pressure regulator, 9, 9', 9
', 9'... Bridge channel, 10... Diaphragm, 11... Upper chamber, 12... Lower chamber, 12a... Discharge port, 13... Valve, 14... First jet,
15...Second jet, 16...Third jet,
17... Fourth jet, 22... First fuel passage,
23...Inflow side solenoid valve, 24...Second fuel passage,
25...Consumption side solenoid valve, 28...Air passage, 29
...Assist air jet, 30...Partial pressure jet, 31...Partial pressure means.

Claims

[Claims for Utility Model Registration] Upper and lower fuel chambers separated by a diaphragm, a valve that can inject fuel from a discharge port in the lower chamber in conjunction with the diaphragm, and the upper and lower chambers. Consisting of first and third jets of the same diameter provided on the fuel inflow side of the chamber, and second and fourth jets of the same diameter provided on the fuel outflow side of the upper and lower chambers, respectively. one or more bridge passages; a fuel pressure regulator that changes the pressure of fuel supplied to or sent out from the bridge passage according to the partial pressure of the suction negative pressure;
An inflow-side solenoid valve that controls the opening area of a first fuel passage that can introduce fuel at a constant pressure into the upper chamber according to the engine speed, and an opening area of a second fuel passage that bypasses the second jet that controls the opening area of the A consumption means consisting of a consumption-side solenoid valve controlled according to the rotational speed, and a discharge port of the lower chamber and the atmosphere are communicated through an assist air jet and a partial pressure jet, respectively, and one end is connected to the fuel pressure regulator. a fuel injector comprising: a partial pressure means connected; and a fuel injector.