A proportional flow metering valve

Abstract

The present invention relates to the technical field of high-pressure common rail fuel systems for engines, and specifically discloses a proportional flow metering valve. The valve comprises a metering valve body, and one end of the induction head of the metering valve body is provided with a correction component, the correction component comprises a plurality of vertically arranged reset magnetic induction coils and a plurality of horizontally arranged displacement magnetic induction coils, one end of the reset magnetic induction line faces the metering valve body, one end of the displacement magnetic induction coil faces the induction head, the reset magnetic induction coil and the displacement magnetic induction coil are circumferentially spaced apart and arranged outside the induction head, and an electromagnet mutually repelling the reset magnetic induction coil is provided on the induction head. The purpose of the present invention is to solve the problem that when a conventional metering valve is used in a high-pressure common rail fuel system, the displacement of the induction head of the metering valve is easily affected by the fuel supply waveform or external vibration, thereby resulting in inaccurate measurement results.

Description

Technical Field

[0001] The present application relates to the technical field of engine high-pressure common rail fuel systems, and specifically discloses a proportional flow metering valve. Background Art

[0002] High-pressure common rail (Common Rail) electronic fuel injection technology refers to a fuel supply method that completely separates the generation of injection pressure and the injection process from each other in a closed-loop system composed of a high-pressure fuel pump, a pressure sensor and an electronic control unit (ECU). It is a method in which a high-pressure fuel pump delivers high-pressure fuel to a common fuel supply pipe (Rail), and the oil pressure in the common fuel supply pipe is precisely controlled, so that the pressure of the high-pressure fuel pipe (Pressure) is independent of the engine speed, which can greatly reduce the degree to which the diesel engine fuel supply pressure changes with the engine speed.

[0003] In the currently used high-pressure common rail fuel systems, there is no actual fuel flow feedback mechanism at the injector end. Some systems are equipped with a flow limiting valve to ensure reliability, but its structure has great limitations and cannot be widely promoted and applied. If metering is used directly for flow feedback, since the principle of the metering valve is proportional, the resonance caused by the fuel supply waveform cannot be eliminated in the application of the high-pressure common rail, resulting in inaccurate measurement results of the displacement of the sensor head of the metering valve. Therefore, in view of this, the inventor provides a proportional flow metering valve to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that when a conventional metering valve is used in a high-pressure common rail fuel system, the displacement of the sensing head of the metering valve is easily affected by the fuel supply waveform, thereby causing inaccurate measurement results.

[0005] In order to achieve the above-mentioned purpose, the basic scheme of the present invention provides a proportional flow metering valve, including a metering valve body, a correction component is provided at one end of the induction head of the metering valve body, the correction component includes a plurality of vertically arranged reset magnetic induction coils and a plurality of horizontally arranged displacement magnetic induction coils, one end of the reset magnetic induction line is toward the metering valve body, one end of the displacement magnetic induction coil is toward the induction head, the reset magnetic induction coil and the displacement magnetic induction coil are circumferentially spaced outside the induction head, and an electromagnet that repel each other with the reset magnetic induction coil is provided on the induction head.

[0006] The principles and effects of this basic solution are:

[0007] 1. The sensor head can be in the correction component, and there will be a certain amount of displacement during the fuel injection process. In this process, the flow rate is determined by measuring the displacement of the sensing signal, and the fuel injection amount of the injector can be determined.

[0008] 2. During the large flow injection stage, as the speed increases, the change in injection frequency may cause the induction head to remain in a lower position, so the measurement value is very inaccurate, and the entire measuring valve may cause other functions to fail. Therefore, a reset magnetic induction coil and an electromagnet are introduced. After the injection control is completed (injection interval), the reset magnetic induction coil and the electromagnet are reset. Through the principle of magnetoelectricity, the reset magnetic induction coil and the electromagnet repel each other, thereby resetting the induction head of the metering valve body so that it can accurately record the displacement of the induction head during the next injection.

[0009] 3. When the induction head moves, the displacement magnetic coil will generate magnetic flux lines in the direction of the induction head. When the induction head passes by, the magnetic flux lines can be cut. The induced current generated in the cutting process can be used to measure the displacement of the induction head, thereby further correcting the measurement amount and improving the monitoring effect.

[0010] Compared with the existing technology, the smooth application of the metering valve has a significant effect on the control of the actual injection oil volume of a single cylinder of the engine; at the same time, the effect of new application functions such as cylinder deactivation and energy saving is also significantly improved, the engine control strategy will be more perfect, and the closed-loop control of the entire injection will have an additional monitoring and correction parameter, which improves the matching reliability of the fuel system to the engine.

[0011] Furthermore, the invention also includes a correction component installation shell, wherein the reset magnetic induction coil and the displacement magnetic induction coil are circumferentially spaced in the installation shell, thereby improving the simplicity of use of the correction component.

[0012] Furthermore, the mounting shell includes support rings symmetrically arranged at both ends of the reset magnetic induction coil, an outer shell arranged outside the support ring, and an inner shell arranged inside the support ring, and a functional hole for allowing the cable to pass through is opened on the side wall of the outer shell, thereby reducing the influence of the fuel on the reset magnetic induction coil and the displacement magnetic induction coil during the injection process.

[0013] Furthermore, a mounting disc is provided on the surface of one of the support rings for facilitating the installation of the metering valve body, thereby improving the convenience of use and installation.

[0014] Furthermore, a sealing ring is provided in the functional hole to prevent the fuel from entering, thereby preventing the fuel from entering the mounting shell.

[0015] Furthermore, a sealing gasket is provided between the metering valve body and the correction assembly to prevent fuel leakage, thereby reducing measurement errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic diagram of a proportional flow metering valve proposed in an embodiment of the present application is shown;

[0018] Figure 2 A structural schematic diagram of a correction component in a proportional flow metering valve proposed in an embodiment of the present application is shown;

[0019] Figure 3 A schematic diagram of the internal structure of a correction component in a proportional flow metering valve proposed in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0020] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0021] The reference numerals in the drawings of the specification include: metering valve body 1, outer shell 2, mounting disc 3, inner shell 4, displacement magnetic induction coil 5, reset magnetic flux line 6, support ring 7.

[0022] Implementation example Figure 1 As shown, it includes a metering valve body 1, the lower end of which is mounted on the upper surface of a mounting disc 3 of the correction component, and a sealing gasket is arranged between the metering valve body 1 and the mounting disc 3 to prevent fuel leakage. Figure 2 and Figure 3 As shown, the mounting disc 3 is fixedly connected to the upper surface of the upper support ring 7, four reset magnetic flux lines 6 are vertically arranged between two symmetrically arranged support rings 7, four displacement magnetic induction coils 5 installed on the inner side of the outer shell 2 are horizontally arranged in the middle of the gap between the four reset magnetic flux lines 6, the upper ends of the reset magnetic flux lines 6 are facing the metering valve body 1, and the ends of the displacement magnetic induction coils 5 facing the inner shell 4 are all facing a center of a circle, the four displacement magnetic induction coils 5 and the four reset magnetic flux lines 6 are centered on the support ring 7 to form a sleeve that can accommodate the reciprocating motion of the induction head, and the induction head is provided with an electromagnet that repel the reset magnetic flux lines 6; an outer shell 2 is welded to the outside of the support ring 7, and an inner shell 4 is welded to the inside of the support ring 7, and the side wall of the outer shell 2 is provided with a functional hole that can accommodate the passage of the cable, and a sealing ring is provided in the hole to prevent the entry of fuel.

[0023] Before use, first connect the metering valve body 1, 6 turns of resetting magnetic flux lines, the magnetic shifting coil and the electromagnet to the ECU signal, and then enter the program for controlling the metering valve body 1, 6 turns of resetting magnetic flux lines, the magnetic shifting coil and the electromagnet into the ECU. Since the control of the metering valve body 1, 6 turns of resetting magnetic flux lines, the magnetic shifting coil and the electromagnet are known to those skilled in the art and are not protected objects, they are not described in detail. Then install the metering valve at the corresponding injection port of the injector and start using it.

[0024] Usage process:

[0025] Static treatment: 6 turns of reset magnetic flux lines are energized, and displacement magnetic flux coil 5 does not output. At this time, the induction head is close to the upper end of the valve body and does not move;

[0026] Dynamic processing: The 6 turns of reset magnetic flux lines are reversely controlled according to the ECU injection signal. When there is an injection action, the 6 turns of reset magnetic flux lines are not energized, and the induction head moves with the liquid flow in the cavity to the corresponding position; further, when the injection signal is interrupted, the 6 turns of reset magnetic flux lines are energized, the induction head is reset, and the displacement coil is displaced during the movement of the induction head to complete the signal output;

[0027] Finally, the specific flow rate is obtained by comparing the corresponding map table in the system. The flow value is compared with the set value to complete the closed-loop correction.

[0028] Through the smooth application of the metering valve, the control of the actual injection oil volume of a single cylinder of the engine is significantly improved; at the same time, the effect of new application functions such as cylinder deactivation and energy saving is also significantly improved, the engine control strategy will be more perfect, and the closed-loop control of the entire injection will have an additional monitoring and correction parameter, which improves the matching reliability of the fuel system to the engine.

[0029] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A proportional flow metering valve, characterized in that: It includes a metering valve body, one end of the induction head of the metering valve body is provided with a correction component, the correction component includes a plurality of vertically arranged reset magnetic induction coils and a plurality of horizontally arranged displacement magnetic induction coils, one end of the reset magnetic induction line faces the metering valve body, one end of the displacement magnetic induction coil faces the induction head, the reset magnetic induction coil and the displacement magnetic induction coil are circumferentially spaced outside the induction head, and the induction head is provided with an electromagnet that repel each other with the reset magnetic induction coil; It also includes a correction component installation shell, in which the reset magnetic induction coil and the displacement magnetic induction coil are circumferentially spaced apart and arranged in the installation shell; A sealing gasket is provided between the metering valve body and the correction assembly to prevent fuel leakage.

2. A proportional flow metering valve according to claim 1, characterized in that: The installation shell comprises support rings symmetrically arranged at both ends of the reset magnetic induction coil, an outer shell arranged outside the support ring and an inner shell arranged inside the support ring, and a functional hole for allowing cables to pass through is opened on the side wall of the outer shell.

3. A proportional flow metering valve according to claim 2, characterized in that: A mounting disc is provided on the surface of one of the support rings for facilitating the mounting of the metering valve body.

4. A proportional flow metering valve according to claim 2, characterized in that: A sealing ring is arranged in the functional hole to prevent fuel from entering.

Images