CN111648893A - A plunger for an electronically controlled fuel injector control valve, a fast response electronically controlled fuel injector control valve and a control method thereof - Google Patents

Abstract

The invention discloses a plunger for an electronically controlled fuel injector control valve and an electronically controlled fuel injector control valve, wherein a counterbore and a radial groove are arranged on the plunger body, so that the plunger body ascends to the top dead center, and the high-pressure fuel After passing through the radial groove and the counterbore, it flows out from the oil outlet channel, which does not affect the pressure change in the control chamber and avoids the vibration when the plunger body reaches the top dead center. At the same time, when the ball valve goes down, the high-pressure fuel pressure acts on the lower surface of the counterbore, and the plunger body goes down quickly, avoiding the delay in closing the fuel injection.

Description

A plunger for an electronically controlled fuel injector control valve, a fast response electronically controlled fuel injector control valve and its control method

technical field

The invention relates to the technical field of diesel fuel injection systems, in particular to a plunger for an electronically controlled fuel injector control valve, a fast-response electronically controlled fuel injector control valve and a control method thereof.

Background technique

The electronically-controlled injector control valve is the core and important component of the electronically-controlled injector. It changes the force state of the plunger and its connecting parts by changing the fuel pressure in the control chamber to realize the opening and closing of fuel injection.

In the current control valve structure of the electronically controlled injector, the maximum lift of the plunger is limited by the height of the control cavity. It hinders the fuel flow of the oil outlet orifice in the control chamber, affects the change of fuel pressure in the control chamber, and easily causes the plunger to vibrate at the top dead center. At the same time, when the ball valve is seated and the oil outlet orifice in the control valve is closed, the fuel pressure in the control chamber rises. This structure will prevent the fuel pressure from acting on the upper surface of the plunger, resulting in a delay in closing the fuel injection and causing fuel injection. The increase of the pulse width makes it more difficult to match the electronically controlled injector with the engine.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a plunger for an electronically controlled fuel injector control valve in view of the technical defects in the prior art that the plunger vibrates when the plunger reaches the top dead center and the fuel injection closing delay is delayed.

Another object of the present invention is to provide a fast response electronically controlled fuel injector control valve.

Another object of the present invention is to provide the above-mentioned control method for a control valve of a fast-response electronically controlled fuel injector.

The technical scheme adopted for realizing the purpose of the present invention is:

A plunger for a control valve of an electronically controlled fuel injector, the middle part of the upper surface of the top of the plunger body is axially downwardly recessed to form a counterbore, the outer periphery of the upper surface of the top is formed with a protrusion, and one or more protrusions are arranged on the protrusion Radial grooves for the high-pressure fuel to pass through, each of the radial grooves and the counterbore in a radial direction.

In the above technical solution, there are four radial grooves, which are evenly distributed on the protrusions, and the included angle between the axes of adjacent radial grooves is 90°.

In the above technical solution, the cross section of each radial groove in the circumferential direction of the plunger is a semicircle with an upward opening, and the height of the counterbore is equal to the radius of the semicircle.

In the above technical solution, the diameter of the counterbore is 70%-95% of the diameter of the plunger.

In the above technical solution, the outer wall of the plunger body is provided with two parallel annular grooves, and each annular groove is a circumferential groove formed on the side wall.

In another aspect of the present invention, a quick-response electronically controlled fuel injector control valve includes a control body, a plunger for the electronically controlled fuel injector control valve and a ball valve;

The control body is provided with an oil inlet channel for high-pressure fuel to enter, an oil outlet channel for high-pressure fuel to flow out, and a plunger cavity for accommodating the plunger body, the oil inlet channel and the oil outlet channel are respectively communicated with the plunger cavity, the diameter of the oil outlet orifice in the oil outlet channel is larger than the diameter of the oil inlet orifice in the oil inlet channel, and the plunger body moves up and down in the plunger cavity , the ball valve is located at the top of the oil outlet channel and is sealed with the oil outlet channel line;

The plunger cavity includes a control cavity and a plunger section arranged up and down, the diameter of the control cavity is larger than the diameter of the plunger section, and the diameter of the plunger section is equal to the diameter of the plunger body. When the plunger body ascends to the top dead center, a gap is formed between the side surface of the end portion of the plunger body and the inner side wall of the control chamber.

In the above technical solution, the oil inlet passage includes a first bell mouth opened on the side surface of the control body and an oil inlet orifice that radially penetrates the first bell mouth and the control cavity.

In the above technical solution, the oil outlet channel includes a second bell mouth, a sealing cone surface, a first diversion section, an oil outlet orifice, a second diversion section and a third horn which communicate with each other sequentially from top to bottom. The diameter of the ball valve is smaller than the diameter of the edge of the sealing cone and larger than the diameter of the first diversion section. When the ball valve is located at the lowest end, it is sealed with the sealing cone, and the third horn A port opening communicates downwardly with the control chamber.

In the above technical solution, the diameter of the radial groove is larger than the diameter of the oil outlet orifice.

In another aspect of the present invention, in the above-mentioned control method for a control valve of a fast-response electronically controlled fuel injector, high-pressure fuel enters the control chamber through an oil inlet passage, and when the ball valve moves upward, the seal between the ball valve and the oil outlet passage is released. , the high-pressure fuel flows out through the oil outlet channel. Since the diameter of the oil outlet orifice is larger than the diameter of the oil inlet orifice, the pressure in the control chamber decreases, the plunger body goes up to the top dead center, and the high-pressure fuel Pass through the radial groove and the counterbore in sequence, and then flow out from the oil outlet channel without affecting the pressure change in the control chamber;

When the ball valve goes down, the ball valve and the oil outlet channel line seal is established, the oil outlet channel is closed, the pressure in the control chamber rises, and the high-pressure fuel pressure acts on the lower surface of the counterbore to drive the The plunger body descends rapidly.

Compared with the prior art, the beneficial effects of the present invention are:

1. The plunger for the control valve of the electronically controlled fuel injector proposed by the present invention, the plunger body is provided with a counterbore and a radial groove, so that the plunger body goes up to the top dead center, and the high-pressure fuel passes through the radial groove and the counterbore The oil outlet channel flows out, and the high-pressure fuel flow channel can still be kept smooth, without affecting the pressure change in the control chamber, and avoiding the vibration when the plunger body reaches the top dead center. At the same time, due to the arrangement of the counterbore, the force bearing area of the plunger body when it ascends to the top dead center is increased. When the ball valve goes down, the high-pressure fuel pressure acts on the lower surface of the counterbore, and the plunger body goes down quickly, avoiding the delay in closing the fuel injection.

2. The fast-response electronically controlled fuel injector control valve proposed by the present invention includes a control body, a plunger and a ball valve for the above-mentioned electronically controlled fuel injector control valve, wherein the plunger body is provided with countersunk holes and radial grooves, so that the The plunger body goes up to the top dead center, and the high-pressure fuel flows out from the oil outlet channel after passing through the radial groove and the counterbore, which does not affect the pressure change in the control cavity and avoids the vibration when the plunger body reaches the top dead center. When the ball valve goes down, the high-pressure fuel pressure acts on the lower surface of the counterbore, and the plunger body goes down quickly, avoiding the delay in closing the fuel injection.

Description of drawings

Figure 1 shows a schematic diagram of the upper end structure of the plunger;

Figure 2 shows a schematic structural diagram of a plunger;

Figure 3 shows a schematic cross-sectional structure diagram of a fast-response electronically-controlled injector control valve;

FIG. 4 is a schematic cross-sectional structure diagram of the control body.

In the figure: 1-control body, 1-1-second bell mouth, 1-2-seal cone, 1-3-first diversion section, 1-4-oil outlet orifice, 1-5-th Second guide section, 1-6-Third bell mouth, 1-7-Control chamber, 1-8-Plunger section, 1-9-First bell mouth, 1-10-Oil inlet orifice, 2- Plunger body, 2-1-radial groove, 2-2-counter hole, 2-3-annular groove, 2-4-protrusion, 3-ball valve.

Detailed ways

The present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

Example 1

A plunger for a fast-response electronically controlled fuel injector control valve, as shown in Figures 1 and 2, the middle part of the upper surface of the top of the plunger body 2 is recessed axially downward to form a counterbore 2-2, and the upper surface of the top A protrusion 2-4 is formed on the outer circumference of the protrusion 2-4, and one or more radial grooves 2-1 for high-pressure fuel to pass through are provided on the protrusion 2-4. Each of the radial grooves 2-1 and the counterbore 2-2 penetrates in the radial direction.

The plunger body 2 is provided with a counterbore 2-2 and a radial groove 2-1, so that the plunger goes up to the top dead center, and the high-pressure fuel flows out from the oil outlet channel after passing through the radial groove 2-1 and the counterbore 2-2. It does not affect the change of the pressure in the control cavity and avoids the vibration when the plunger reaches the top dead center. At the same time, when the ball valve goes down, the high-pressure fuel pressure acts on the lower surface of the counterbore, and the plunger goes down quickly, avoiding the delay in closing the fuel injection.

Preferably, there are four radial grooves 2-1, which are evenly distributed on the protrusions 2-4, and the included angle between the axes of adjacent radial grooves 2-1 is 90°.

Preferably, the cross section of each of the radial grooves 2-1 in the circumferential direction of the plunger is a semicircle with an upward opening, and the height of the counterbore 2-2 is equal to the radius of the semicircle.

Preferably, the diameter of the counterbore 2-2 is 70%-95% of the diameter of the plunger body 2, so that it has a larger lower surface as a force-bearing surface, and drives the plunger when the fuel pressure increases Ontology 2 descended rapidly.

Preferably, two parallel annular grooves 2-3 are provided on the outer wall of the plunger body 2, and each annular groove 2-3 is a circumferential groove formed on the side wall. The annular groove 2-3 can store the high-pressure fuel leaked from the control chamber 1-7, and form a uniform oil film on the outer wall of the plunger body 2 and the inner wall of the plunger segment 1-8 to reduce wear.

Example 2

A fast-response electronically controlled fuel injector control valve, as shown in Figure 3, includes a control body 1, a plunger body 2 and a ball valve 3 described in Embodiment 1;

As shown in FIG. 4 , the control body 1 is provided with an oil inlet channel for high-pressure fuel to enter, an oil outlet channel for high-pressure fuel to flow out, and a plunger cavity for accommodating the plunger body 2. The plunger The body 2 moves up and down in the plunger cavity, the ball valve 3 is sealed with the oil outlet channel, and the oil inlet channel and the oil outlet channel are respectively communicated with the plunger cavity;

The plunger cavity includes a control cavity 1-7 and a plunger segment 1-8 arranged up and down, the diameter of the control cavity 1-7 is larger than that of the plunger segment 1-8, and the plunger segment 1- The diameter of 8 is equal to the diameter of the plunger body 2. When the plunger body 2 goes up to the top dead center, a gap is formed between the end side of the plunger body 2 and the inner side wall of the control cavity 1-7. , to provide a flow space for the high-pressure fuel when the plunger body 2 goes up to the top dead center;

The middle part of the upper surface of the top of the plunger body 2 is recessed axially downward to form a counterbore 2-2. The top of the plunger body 2 is radially provided with a radial groove 2-1 for high-pressure fuel to pass through. 2-1 The counterbore 2-2 radially penetrates the outer surface of the plunger body 2 .

The control method of the above-mentioned fast-response electronically controlled injector control valve:

The high-pressure fuel enters the control chambers 1-7 through the oil inlet channel. When the ball valve 3 goes up, the seal between the ball valve 3 and the oil outlet channel is released, and the high-pressure fuel flows out through the oil outlet channel. The diameter of the hole 1-4 is larger than the diameter of the oil inlet orifice 1-10, the pressure in the control chamber 1-7 decreases, the plunger body 2 goes up to the top dead center, and the high-pressure fuel passes through the end of the plunger body 2 The gap between the side surface and the inner side wall of the control chamber 1-7 enters the radial groove 2-1 and the counterbore 2-2, and then flows out from the oil outlet channel. The high-pressure fuel flow channel is still smooth without affecting the The change of the pressure in the control cavity 1-7 avoids the tremor when the plunger body 2 reaches the top dead center;

When the ball valve 3 goes down, the ball valve 3 and the oil outlet channel line seal is established, the oil outlet channel is closed, the pressure in the control chamber 1-7 increases, and the high-pressure fuel pressure acts on the counterbore 2-2 lower surface, drive the plunger body 2 to descend rapidly, avoiding the delay of closing the fuel injection.

Example 3

This embodiment is a further description of the oil inlet passage and the oil outlet passage on the basis of Embodiment 1.

Specifically, the oil inlet channel includes a first bell mouth 1-9 opened on the side surface of the control body 1 and a radially passing through the first bell mouth 1-9 and the control cavity 1-7. Inlet orifice 1-10.

Specifically, from top to bottom, the oil outlet channel includes a second bell mouth 1-1 with an upward opening, a sealing cone surface 1-2 with a large upper and a small bottom, a first guide section 1-3, and an oil outlet section. Orifice 1-4, second diversion section 1-5 and third bell mouth 1-6; the diameter of the ball valve 3 is smaller than the diameter of the upper edge of the sealing cone 1-2 and larger than the first diversion section The diameter of 1-3, that is, the diameter of the lower edge of the sealing cone 1-2, the ball valve 3 is sealed with the sealing cone 1-2, and the third bell mouth 1-6 opens downward with the Control chambers 1-7 communicate.

Specifically, the diameter of the oil outlet orifice 1-4 is larger than the diameter of the oil inlet orifice 1-10. When the ball valve 3 goes up, the seal between the ball valve 3 and the oil outlet channel is released, and the high-pressure fuel flows out through the oil outlet channel. Because the diameter of the oil outlet throttle holes 1-4 is larger than the oil inlet throttle The diameter of the hole 1-10, the pressure in the control chamber 1-7 is reduced.

The above are only the preferred embodiments of the present invention. It should be noted that, for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. These improvements and Retouching should also be considered within the scope of protection of the present invention.

Claims (10)

1. A plunger for an electronically controlled fuel injector control valve, characterized in that the middle part of the upper surface of the top end of the plunger body (2) is recessed axially downward to form a counterbore (2-2), and the outer periphery of the upper surface of the top end forms a counterbore (2-2). A protrusion (2-4), the protrusion (2-4) is provided with one or more radial grooves (2-1) for the high-pressure fuel to pass through, each of the radial grooves (2-1) It penetrates with the counterbore (2-2) in the radial direction. 2. The plunger for an electronically controlled fuel injector control valve according to claim 1, wherein the number of said radial grooves (2-1) is 4, which are evenly distributed on said protrusions (2-4) above, the included angle between the axes of the adjacent radial grooves (2-1) is 90°. 3. The plunger for an electronically controlled fuel injector control valve according to claim 1, characterized in that: each of the radial grooves (2-1) is in the circumferential direction of the plunger (2). The cross section is a semicircle with an upward opening, and the height of the counterbore (2-2) is equal to the radius of the semicircle. 4. The plunger for an electronically controlled fuel injector control valve according to claim 1, wherein the diameter of the counterbore (2-2) is 70%-95% of the diameter of the plunger (2). %. 5. The plunger for an electronically controlled fuel injector control valve according to claim 1, wherein two parallel annular grooves (2-3) are provided on the outer wall of the plunger (2), each The annular groove (2-3) is a circumferential groove formed on the side wall. 6. A fast-response electronically controlled fuel injector control valve, characterized in that: comprising a control body (1), the electronically controlled fuel injector control valve plunger and a ball valve ( 3); The control body (1) is provided with an oil inlet passage for high-pressure fuel to enter, an oil outlet passage for high-pressure fuel to flow out, and a plunger cavity for accommodating the plunger body (2). The oil outlet passages are respectively communicated with the plunger cavity, and the diameter of the oil outlet orifice (1-4) in the oil outlet passage is larger than the diameter of the oil inlet orifice (1-10) in the oil inlet passage. diameter, the plunger body (2) moves up and down in the plunger cavity, the ball valve (3) is located on the top of the oil outlet channel and is sealed with the oil outlet channel; The plunger cavity includes a control cavity (1-7) and a plunger segment (1-8) arranged up and down, and the diameter of the control cavity (1-7) is larger than the diameter of the plunger segment (1-8). , the diameter of the plunger segment (1-8) is equal to the diameter of the plunger body (2), when the plunger body (2) goes up to the top dead center, the end of the plunger body (2) A gap is formed between the side surface of the part and the inner side wall of the control cavity (1-7). 7. The fast-response electronically controlled fuel injector control valve according to claim 6, wherein the oil inlet channel comprises a first bell mouth (1-9) opened on the side surface of the control body (1) and an oil inlet orifice (1-10) radially passing through the first bell mouth (1-9) and the control cavity (1-7). 8. The fast-response electronically-controlled fuel injector control valve according to claim 7, wherein the oil outlet channel comprises a second bell mouth (1-1) that communicates with each other, a sealing cone surface in sequence from top to bottom (1-2), the first diversion section (1-3), the oil outlet orifice (1-4), the second diversion section (1-5) and the third bell mouth (1-6); The diameter of the ball valve (3) is smaller than the diameter of the upper edge of the sealing cone surface (1-2) and larger than the diameter of the first diversion section (1-3). The sealing cone surface (1-2) is line sealed, and the opening of the third bell mouth (1-6) communicates downward with the control cavity (1-7). 9. The fast-response electronically controlled fuel injector control valve according to claim 8, wherein the diameter of the radial groove (2-1) is larger than the diameter of the oil outlet orifice (1-4) . 10. The control method for a fast-response electronically controlled fuel injector control valve according to claim 9, wherein the high-pressure fuel enters the control chamber (1-7) through the oil inlet passage, and when the ball valve (3) moves upwards , the seal between the ball valve (3) and the oil outlet channel is released, and the high-pressure fuel flows out through the oil outlet channel. Because the diameter of the oil outlet orifice (1-4) is larger than the oil inlet orifice (1-4) -10) diameter, the pressure in the control chamber (1-7) decreases, the plunger body (2) goes up to the top dead center, and the high-pressure fuel passes through the radial groove (2-1) and the counterbore ( 2-2), and then flows out from the oil outlet channel without affecting the pressure change in the control chamber (1-7); When the ball valve (3) goes down, the ball valve (3) is sealed with the oil outlet channel, the oil outlet channel is closed, the pressure in the control chamber (1-7) increases, and the high-pressure fuel pressure Acting on the lower surface of the counterbore (2-2), the plunger body (2) is driven to descend rapidly.

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