JPH0368566U

JPH0368566U -

Info

Publication number: JPH0368566U
Application number: JP12951789U
Authority: JP
Priority date: 1989-11-06
Filing date: 1989-11-06
Publication date: 1991-07-05

Description

[Brief explanation of the drawing]

第１図乃至第１１図は本考案に係る燃料噴射装
置の燃料増量機構の一実施例に関するものであつ
て、第１図は燃料噴射装置の概略断面図、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Ｑ_ｃ，Ｑ_ｄを示す図、第４図
は設定用分圧吸入負圧Ｐ′_ｍに関して分圧した場
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とエンジン
回転数に応じた要求燃料流量Ｑを示す図、第６図
はワツクス温度と開口Ａの面積との関係を示す図
、第７図は増圧スプリングの弾力に対する第二圧
力室の負圧ＰＢの変化を示す図、第８図は各ワツ
クス温度Ｔ_ａ，Ｔ_ｂ，Ｔ_ｃの場合における燃圧Ｐ
_ａの変化を示す図、第９図は各吸入負圧Ｐ_ｍにお
けるワツクス温度に応じた燃圧Ｐ_ａの増圧の大き
さを示す図、第１０図は各ワツクス温度Ｔ_ａ，Ｔ
_ｂ，Ｔ_ｃの場合における燃料噴射量Ｑ_ｂの変化を
示す図、第１１図は本実施例における燃圧Ｐ_ａと
燃料噴射量Ｑ_ｂの関係を示す図、第１２図は本考
案の第二実施例を示すフアーストアイドル手段の
要部断面図、第１３図は燃料噴射装置の変形例を
示す要部断面図である。２……燃圧レギユレータ、３……第一圧力室、
５……第一ダイアフラム、１０……ダイアフラム
、１１……上室、１２……下室、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、２３……流入側
電磁弁、２５……消費側電磁弁、３３……燃料増
量手段、３６……第二圧力室、３７……第二ダイ
アフラム、３９……増圧スプリング、４１……ジ
エツト、４４……ワツクス、４５……ＰＴＣ、４
６……メータリングニードル、４８……押圧部材
、４９……第一レバー、５１……第二レバー、５
２……スロツトルレバー。 1 to 11 relate to an embodiment of a fuel increasing mechanism for a fuel injection device according to the present invention, in which FIG. 1 is a schematic sectional view of the fuel injection device, and FIG. 2 is a schematic cross-sectional view of the fuel injection device, and FIG. A diagram showing the relationship between the engine speed and the duty ratio of the consumption-side solenoid valve, and FIG. 3 shows the fuel Q _c and Q _d with respect to the fuel pressure P _a according to the respective opening areas of the inflow-side solenoid valve and the consumption-side solenoid valve. Figure 4 is a diagram showing the relationship between suction negative pressure P _m and fuel pressure P a with and without partial pressure setting partial pressure suction negative pressure P' _m , and Figure 5 is a diagram showing the relationship between suction negative pressure P m and fuel pressure P _a . _Fig . 6 shows the relationship between wax temperature and the area of opening A, and Fig. 7 shows the negative effect of the second pressure chamber against the elasticity of the pressure boosting spring. A diagram showing changes in pressure PB, Fig. 8 shows fuel pressure P at each wax temperature T _a , T _b , T _c
_FIG . 9 is a diagram showing the magnitude of pressure increase in fuel pressure P _a according to wax temperature at each suction negative pressure P _m , and FIG. 10 is a diagram showing changes in wax temperature T _a , T
₁₁ is a diagram showing the relationship between the fuel pressure P _a and _the fuel injection amount Q _b in the present embodiment _, and FIG. FIG. 13 is a sectional view of a main part of a first idle means showing an embodiment, and FIG. 13 is a sectional view of a main part of a modification of a fuel injection device. 2... Fuel pressure regulator, 3... First pressure chamber,
5...First diaphragm, 10...Diaphragm, 11...Upper chamber, 12...Lower chamber, 14...First jet, 15...Second jet, 16...Third jet, 17...Fourth Jet, 23... Inflow side solenoid valve, 25... Consumption side solenoid valve, 33... Fuel increase means, 36... Second pressure chamber, 37... Second diaphragm, 39... Pressure increase spring, 41... Jet, 44...Wax, 45...PTC, 4
6... Metering needle, 48... Pressing member, 49... First lever, 51... Second lever, 5
2...Throttle lever.

Claims

[Claims for Utility Model Registration] (1) A first fuel chamber and a second fuel chamber separated by a diaphragm, a valve capable of injecting fuel from the second chamber in conjunction with the diaphragm, and a valve capable of injecting fuel from the second chamber in conjunction with the diaphragm; First and third jets of the same diameter are provided on the fuel inflow sides of the first and second chambers, respectively, and second jets of the same diameter are provided on the fuel outflow sides of the first and second chambers, respectively. and a fourth jet, and applying the pressure of the fuel supplied to or sent out from the bridge passage to a first pressure chamber partitioned by a first diaphragm. a fuel pressure regulator that changes the suction negative pressure according to the set suction negative pressure or a set partial suction negative pressure, and openings of a first fuel passage that supplies fuel to the first chamber and a second fuel passage that sends fuel from the first chamber. a consumption means consisting of an inflow side solenoid valve and a consumption side solenoid valve whose area is controlled respectively according to the engine rotation speed; a second pressure chamber to which partial suction negative pressure for pressure increase is applied; and the second pressure chamber. a second diaphragm that partitions the constant pressure chamber and interlocks the first diaphragm when the negative pressure in the second pressure chamber is smaller than a predetermined value; and a pressure increasing spring that biases the second diaphragm toward the first diaphragm. A fuel increasing means having a temperature sensing member that can be displaced in response to heat transmission from the heat generating member, and a metering member that controls the partial pressure ratio of the partial pressure suction negative pressure for pressure increase in conjunction with the displacement of the temperature sensing member. , a fuel increase mechanism for a fuel injection device. (2) The fuel increase according to claim (1) of the utility model registration, characterized in that a first idle means for opening the throttle valve to a predetermined opening degree in conjunction with the displacement of the temperature sensing member is added. mechanism.