JPS58222967A - Electronically controlled fuel injector - Google Patents

Abstract

PURPOSE:To control the timing and quantity of fuel injection in a highly accurate manner by means of a couple of spill rings and the like directly driven by a rotary solenoid or a linear solenoid. CONSTITUTION:Each of spill rings 10 and 11 is rotated and driven by each of rotary solenoids 14 and 15. First, at a spot short of a bottom dead center in a plunger compression stroke, when the first spill is started with a spill port 8 and another spill port 12 adjusted right, fuel is spilled out of the port 12 whereby compression comes to a stop and the first spill comes to an end with the compression starting. Next, at a spot short of a top dead center in the plunger compression stroke, when the second spill is started with a spill port 9 and another port 13 adjusted right, the second spill is finished at the vicinity of the top dead center in the plunger compression stroke. Therefore, fuel injection start timing can be independently controlled by one side spill ring 10 while fuel injection finish timing can be controlled by the other side spill ring 11 in the same manner, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel injection device used in an internal combustion engine, and in particular to a distributed type fuel injection system using an overflow metering method controlled by an electronic control device.
This is related to the r14 injection pump.

Conventionally, distribution type fuel injection pumps using an overflow metering method generally cause the fuel compressed in the pump chamber to overflow through a spill ring to terminate fuel injection. Therefore, there is a drawback that it is difficult to control the fuel injection time, that is, the injection (1) with high precision.

The present invention uses an electronic control device and has a pair of spill rings driven by a rotary solenoid or a linear solenoid, one spill ring controls the fuel injection start timing, and the other spill ring controls the fuel injection end. It is an object of the present invention to provide a fuel 1'11 injection system which eliminates the above-mentioned conventional drawbacks by independently controlling the respective timings.

Embodiments of the present invention will be described below based on the drawings.

1 to 3 show a first embodiment in which the present invention is applied to an inner cam type distribution type fuel injection pump, in which the rotating part U1 is connected to the inside of a known inner cam (not shown) at the engine rotational speed. The pressure-feeding blank 2.3, which is housed in the rotating member 1 so as to be slidable in the radial direction within the rotating surface, rotates at 1/2 of the rotation speed of the inner cam as the rotating member 1 rotates. The fuel sucked from the suction boat 4 flows into the pump chamber 5 according to the profile of the
The compressed fuel is compressed in the pump chamber 5 and communicates with J-
The water is pumped from the distribution bowl 1-6 via the suction valve 7 to the nozzle. It is assumed that the suction port 1-4 is pre-pressurized by a feed pump (not shown) and IC fuel is supplied to the suction port 1-4 through an inverted two-way valve (not shown).

The rotary member 1 is also provided with a pair of spill boats 8.9, each corresponding to a spill boat 12.13 of a pair of spill rings 10.11.
are directly rotationally driven in the circumferential direction of the rotating member 1 by rotary solenoids 14.15, respectively, and the rotational angular position of the spill ring 10.11 is determined by a position sensor 16.1, respectively.
Detected at 7.

Reference numeral 18 denotes an electronic control unit (hereinafter referred to as ECU), into which the engine rotational speed Ne signal A, which is the operating condition of the engine, and the engine load signal i (for example, the opening degree α of the accelerator) are inputted, and the position sensor 16.17, the position signals C, D, etc. of the spill rings 10, 11 are input, and in order to bring the engine into the optimum operating state, an appropriate amount of fuel injection and fuel injection timing are calculated in E CtJ 18, and the above-mentioned Drive signals E and F for rotary solenoids 14 and 15 are output.

FIG. 2 shows the structure of the spill ring 10.11, in which a part of the inner hole 19 is provided with a lead-shaped groove 20 parallel to the cylindrical generatrix of the inner hole 19.

Figure 3 shows the spill ring 1 for the plunger compression stroke.
0 and 11, (a) shows the plunger compression stroke, (b) shows the spill timing by the spill ring 10, and (C) shows the spill timing by the spill ring 11.

First, the spill boat 8 and the spill ring 10 of the rotating member 1 are
When the spill bows 1 to 12 are matched to start the first spill, fuel overflows from the spill bows 1 to 12, compression stops, and the 11th spill ends at the start of compression (2). Next, at the point before the top dead center of the plunger compression stroke, the spill boats 1 to 9 of the rotating member 1 are aligned with the spill boat 13 of the spill ring 11 to start the second spill, and the plunger compression stroke is near the top dead center. to end the second spill. Therefore, the C fuel is compressed only from the end of the first spill to the start of the second spill, and the compression start timing, that is, the fuel injection timing is the spill timing of one spill ring 10, and The fuel injection end timing can be independently controlled by the spill timing of the other spill ring 11, and thereby the fuel injection can also be controlled.

Next, FIG. 4 shows a second embodiment of the present invention. Since t = b, in this case, linear solenoids 21 and 22 are used in place of the rotary solenoid in the first embodiment, and the fifth
As shown in the figure, each of the pair of spill rings 23, 24 is provided with a lead-shaped groove 25 that is inclined with respect to the cylindrical generatrix of the inner hole. When the rotating member 1 moves in the axial direction, the relative relationship between the spill bow 1-8.9 and the spill ring 23,24 of the rotating member 1 changes, and as in the previous embodiment, the fuel injection start timing and the fuel injection end are determined. The timing can be controlled independently.

Next, FIG. 6 shows a third embodiment of the present invention, in which the present invention is applied to a face cam type fuel injection pump, in which the plunger t26 is reciprocated by a one-way cam 27. The spill ring 28 is driven in the plunger rotational direction by a rotary solenoid 29, and the other spill ring 30, which does not have a groove, is driven in the plunger axial direction by a linear solenoid 31. .

Next, FIG. 7 shows a fourth embodiment of the present invention. In this case, one of the pair of rotary solenoids explained in the first embodiment is a linear solenoid 32, and the linear The spill ring 33 on the side driven by the solenoid 32 is provided with an inclined lead-shaped groove as explained in the second embodiment.Other than that, it is the same as in the first embodiment. By using the rotary solenoid and the near solenoid in common, it is possible to obtain various fuel injection characteristics.

As described above, the present invention provides an overflow adjustment type distributed fuel injection device controlled by an electronic control device, in which a pair of spill rings are provided that are directly driven by an IJ-Tari solenoid or a linear solenoid. A position sensor is installed to detect the operating position of the spill ring, and the electronic system is capable of independently controlling the fuel injection start timing for one spill ring and the fuel injection end timing for the other spill ring. This is a fuel injection device, which allows for accurate control of both the start and end times of fuel injection, making it possible, for example, to delay or advance the start time of fuel injection as necessary. This increases the control freedom and allows the fuel injection amount to be controlled, making it possible to achieve optimal engine operation control by utilizing the ECU.
There is an effect song in which 11 is easy.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention. Figures 1 to 3 are the first embodiment, Figure 1 is a schematic diagram of the main parts, Figure 2 is a perspective view of the spill ring, and Figure 3 is a timer. The chart, FIGS. 4 and 5 show the second embodiment. FIG. 4 is a schematic diagram of the main parts, FIG. 5 is a perspective view of the spill ring, and FIG. 6 is a main part of the third embodiment. FIG. 7 is a schematic diagram of the main part of the fourth embodiment. 1...Rotating member 2.3...Pressure plunger 4...Suction bow 1-5...Pump chamber 6...Distribution port] 7...Suction return valve 10.11.23.24 .2B, 30.33... Spill ring 14.15.29... Rotary solenoid 16.17
...Position sensor 18...ECU 21.22.31.32...Linear solenoid Fig. 3 Fig. 4 R Fig. 6 IR Fig. 7 R

Claims (1)

[Claims] In an overflow control type distributed fuel injection device controlled by an electronic control device, a pair of spill rings each driven directly by a rotary solenoid or a linear solenoid is provided, and a position lens is provided to detect the operating position of the spill ring. Set (), one spill ring controls the fuel injection start time,
An electronic fuel injection device characterized in that the fuel injection end timing can be independently controlled by the other spill ring.