JPH0327877U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view showing a first embodiment of a multi-point fuel injection device according to the present invention, FIG. 2 is a schematic sectional view of a pressure dividing means, and FIG. 3 is a diagram showing intake manifold pressure P _m and adjusted fuel pressure P _b FIG. 4 is a diagram showing the relationship between adjusted fuel pressure _Pb and fuel injection amount _Q5 , FIG. 5 is a sectional view of main parts showing a modification of the first embodiment, and FIG. 6 is an intake manifold. A diagram showing the relationship between pressure P _m and fuel flow rate, FIG. 7 is a cross-sectional view of the main part showing the second embodiment of the present invention, FIG. 8 is a schematic cross-sectional view of the adjusting means, and FIG. 9 is the third embodiment of the present invention. 10 is a schematic sectional view of the adjusting means, FIG. 11 is a sectional view of the main part showing the fourth embodiment of the present invention, and FIG. 12 is the fifth embodiment of the present invention. FIG. 13 is a schematic sectional view of a multi-point fuel injection device according to the prior art, diagrammatically showing the fuel flow path, and FIG. 14 is a schematic sectional view of the first constant flow rate supply means. . DESCRIPTION OF SYMBOLS 1... First constant flow rate supply means, 9... First flow path, 10... First jet, 13... Second flow path,
15...Fuel injection valve, 17...Upper chamber, 18...Lower chamber, 22...Second constant flow rate supply means, 23...
Third flow path, 24... Third jet, 25... Fourth jet, 27... First fuel pressure regulator, 33
...Pressure dividing means, 39...Third fuel pressure regulator,
44... Fourth fuel pressure regulator, 45... Fuel passage, 46... Fifth jet, 47... First solenoid valve, 55... Sixth jet, 57, 65, 70...
Adjustment means, 69...fourth solenoid valve.

Claims (1)

[Claims for Utility Model Registration] (1) A first stream that returns a constant flow rate of fuel sent out from the first constant flow rate supply means to the fuel supply source via the first jet and the first fuel pressure regulator. and a second flow path configured to allow fuel sent from a second fuel pressure regulator having a higher set pressure than the first fuel pressure regulator to join the first flow path upstream of the first jet via the second jet. The upper chamber, which is arranged for each cylinder and to which the fuel pressure of the flow path upstream of the first jet or downstream of the second jet is applied, connects to the lower chamber and the diaphragm into which fuel can be injected. A constant flow rate of fuel sent out from the fuel injection valve and the second constant flow supply means, which are partitioned by the above, is equally distributed to each of the lower chambers through the third jet, respectively, and a third flow passage configured to send the intake manifold pressure to the first fuel pressure regulator via the jet; and a partial pressure that divides the intake manifold pressure according to the engine speed and applies the divided pressure to the first fuel pressure regulator to control the set fuel pressure. A multi-point fuel injection device comprising: a control unit that measures engine rotational speed and controls the pressure dividing means. (2) The pressure dividing means includes a third fuel pressure regulator to which intake manifold pressure is applied, a fourth fuel pressure regulator having a lower set pressure than the third fuel pressure regulator, and a fuel pressure regulator that communicates with the third and fourth fuel pressure regulators. The fuel passage comprises a passage, a fifth jet provided in the fuel passage, and a first electrical opening area adjusting means for adjusting the opening area of the fuel passage according to the engine speed, and the fifth jet and Claims for registration of a utility model characterized in that the fuel pressure between the first electrical opening area adjusting means and the first fuel pressure regulator is applied to the first fuel pressure regulator.
The multi-point fuel injection device according to (1). (3) A utility model characterized in that, in place of the first constant flow rate supply means, a passage or a sixth jet is provided that communicates the first flow path with a third flow path on the upstream side of the third jet. A multi-point fuel injection device according to registered claim (1) or (2). (4) The scope of the utility model registration claim, characterized in that adjusting means for removing or adding a constant flow rate with a variable set value is disposed in the flow path upstream of the first jet or downstream of the second jet. The multi-point fuel injection device according to any one of 1) to (3). (5) Utility model registration claim (1) or (2) characterized in that adjusting means for supplying the constant flow rate and the constant flow rate with a variable set value is arranged in place of the first constant flow rate supply means. ).The multi-point fuel injection device described in ). (6) Utility model registration claim (3) characterized in that a second electrical opening area adjusting means is provided in the bypass passage that bypasses the sixth jet as an adjusting means for supplying a constant flow rate with a variable set value. ).The multi-point fuel injection device described in ). (7) Adjusting means for removing or adding a constant flow rate with a variable set value is arranged in the fuel passage between the fifth jet of the pressure dividing means and the first electrical opening area adjusting means. A multi-point fuel injection device according to claim (2) of the utility model registration claim (2).