Visual testing device for fuel injector armature and testing method

Abstract

The present application provides a fuel injector armature visualization testing device and testing method. The testing device comprises an electrically controlled fuel injector, a high-speed camera, a light source, a scattering film, an electromagnetic valve, a back pressure valve, an armature, a sealed ceramic ball and ball seat, a guide body, an orifice plate, a visualization lift adjustment pad, and a mounting base, and a high-pressure oil source. The oil return port of the electrically controlled fuel injector is sequentially connected to the mounting base, the orifice plate, the guide body, the armature, the visualization lift adjustment pad, and the electromagnetic valve. The light beam of the light source passes through the scattering film and the visualization lift adjustment pad in sequence and enters the high-speed camera for imaging. The present application can measure the transient motion law of the armature under the real oil return state, and analyze the influence of the oil return state on the motion process of the armature.

Description

Technical Field

[0001] This invention relates to a testing method and testing apparatus for the transient motion law of the armature of a common rail injector. Background Technology

[0002] Diesel engines commonly employ high-pressure common rail systems to improve performance and reduce emissions. The movement of the armature in a common rail injector directly determines several important injector parameters, such as injection consistency, opening delay, closing delay, and injection duration among injectors in multi-cylinder engines. Utilizing reliable methods to measure the transient motion of the armature and analyzing the impact of the environmental conditions on its movement is of great significance for the development of common rail injectors and the optimization of diesel engine combustion.

[0003] In the prior art, patent document CN102996310A discloses a method for testing the armature stroke of an injector assembly. It calculates the armature stroke of the injector assembly by using the inductance-displacement relationship function of the electromagnet and the control valve assembly. This method is used to determine the armature stroke, but it cannot test the dynamic motion law.

[0004] In the prior art, patent document CN103850851A discloses a method and system for detecting the dynamic lift of the armature of a common rail injector, which detects the dynamic movement process of the armature end face through a displacement sensor and a probe. However, current methods for testing the motion law of the common rail injector armature do not consider the environmental conditions during armature operation and fail to clarify the influence of the return oil vapor-liquid state on the dynamic movement process of the armature during injector operation. Summary of the Invention

[0005] The purpose of this invention is to provide a visual testing device for injector armatures.

[0006] Another objective of this invention is to provide a method for visually testing the armature of an injector.

[0007] According to one aspect of this application, a fuel injector armature visualization testing device includes a common rail fuel injector, comprising: an armature and a guide body; a testing component, comprising: a measuring orifice plate, a ceramic sealing ball and ball seat, a high-speed camera, a light source, a scattering film, a solenoid valve, a visualization lift adjustment pad, a back pressure valve, and a mounting base; wherein the mounting base, the measuring orifice plate, the ceramic sealing ball and ball seat, the guide body, the armature, the visualization lift adjustment pad (11), and the solenoid valve are connected sequentially from top to bottom.

[0008] In one or more embodiments of the test apparatus, the return oil port of the common rail injector flows into the armature cavity formed by the three components of the mounting base, the orifice plate, and the guide body through the low-pressure flow channel of the mounting base, the orifice plate, and the guide body, and the return oil finally flows out through the spring hole of the solenoid valve and the back pressure valve.

[0009] In one or more embodiments of the testing device, the high-pressure oil inlet of the mounting base is connected to the high-pressure common rail, and the other end is connected to the oil outlet inlet of the orifice plate. The ceramic sealing ball and ball seat are provided on the outlet cone surface of the orifice plate, the armature is provided on the ball seat, and the spring is provided on the armature.

[0010] In one or more embodiments of the testing apparatus, the light beam from the light source passes through the scattering film, then through the visualization lift adjustment pad, and finally enters the high-speed camera.

[0011] In one or more embodiments of the test apparatus, the common rail injector return oil includes: gap leakage return oil and pilot valve dynamic return oil, and the injector is applicable to types including diesel, calibration pump oil, and low-carbon / zero-carbon fuel.

[0012] In one or more embodiments of the testing apparatus, the visual lift adjustment pad includes: a sapphire lift adjustment pad, a quartz lift adjustment pad, or an acrylic lift adjustment pad.

[0013] According to the second aspect of this application, a method for visually testing the armature of an injector, using the testing apparatus described in the first aspect, includes the following steps: Step S1: The common rail injector and the mounting base are respectively connected to the high-pressure oil source; Step S2: The industrial control computer sends two injector drive signals according to the set parameters to drive the common rail injector and the solenoid valve respectively. In step S3, the return oil from the common rail injector flows through the low-pressure flow channel of the mounting base, the low-pressure flow channel of the orifice plate, and the low-pressure flow channel of the guide body into the armature cavity formed by the three components of the solenoid valve, the visual lift adjustment pad (11), and the guide body, and the return oil finally flows out through the spring hole of the solenoid valve and the back pressure valve. Step S4: For the working state of the injector under different loads, observe the oil-gas mixing state and the position of the gas-liquid interface in the armature chamber through the visual lift adjustment pad. Step S5: After the solenoid valve drive signal is given, the high-speed camera records the movement process of the armature, and then processes the armature disk images at different times to extract the displacement at each time to obtain the movement process of the armature. Step S6: Adjust the back pressure valve to change the oil-gas mixing state in the armature cavity, and repeat step S to analyze the effect of the oil-gas mixing state on the armature movement process.

[0014] In summary, the beneficial effects of the testing device and testing scheme adopted in the above embodiments include, but are not limited to, the ability to measure the transient motion law of the armature under the actual oil return state, and to analyze the influence of the oil return state on the armature motion process. Attached Figure Description

[0015] The above-described and other features, properties, and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, in which the same reference numerals always denote the same features. It should be noted that these drawings are merely illustrative and are not drawn to scale, and should not be construed as limiting the scope of protection actually claimed by the present invention, wherein: Figure 1 This is a schematic diagram of the structure of a visual testing device for injector armatures according to an embodiment.

[0016] Figure 2 This is a flowchart illustrating a visual testing device for an injector armature according to one embodiment. Detailed Implementation

[0017] Reference will now be made in detail to various embodiments of the invention, examples of which are shown in the accompanying drawings and described below. Although the invention will be described in conjunction with exemplary embodiments, it should be understood that this specification is not intended to limit the invention to those exemplary embodiments. Rather, the invention is intended to cover not only these exemplary embodiments, but also various alternatives, modifications, equivalents, and other embodiments that may be included within the spirit and scope of the invention as defined by the appended claims.

[0018] In the following description, the terms “inner,” “outer,” “upper,” “lower,” “top,” “bottom,” or other directional terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the invention.

[0019] Furthermore, this application uses specific terms to describe its embodiments. For example, "some embodiments" refers to a particular feature, structure, or characteristic associated with at least one embodiment of this application. Therefore, it should be emphasized and noted that "some embodiments" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics of some embodiments of this application can be appropriately combined.

[0020] Diesel engines commonly employ high-pressure common rail systems to improve performance and reduce emissions. The movement of the armature in a common rail injector directly determines several important injector parameters, such as injection consistency, opening delay, closing delay, and injection duration among injectors in multi-cylinder engines. Developing reliable methods to measure the transient motion of the armature and analyzing the impact of the environmental conditions on its movement are crucial for the development of common rail injectors and the optimization of diesel engine combustion. Currently, existing methods for testing the armature motion of common rail injectors do not consider the environmental conditions during operation and fail to clarify the influence of the return fuel vapor-liquid state on the dynamic motion of the armature.

[0021] Based on the above considerations, the inventors, through in-depth research, designed a testing device and method to test the armature movement law under actual oil return conditions, and simultaneously analyzed the influence of the oil return state on the armature movement process. The types of oil return can be gap leakage oil return or pilot valve dynamic oil return; the injector can be a diesel injector, a calibration pump oil injector, or a low-carbon / zero-carbon fuel injector, such as a methanol fuel injector or an ammonia fuel injector.

[0022] refer to Figure 1 As shown, in some embodiments, the testing device may include: a common rail injector 1, a high-speed camera 8, a light source 9, a diffuser 10, a solenoid valve 12, an armature 5, a guide body 4, a measuring orifice plate 3, a ceramic sealing ball and ball seat 6, a visual lift adjustment pad 11, a back pressure valve 13, and a mounting base 2. Preferably, the visual lift adjustment pad 11 may be in the form of a sapphire lift adjustment pad, a quartz lift adjustment pad, or an acrylic lift adjustment pad, etc., and is not limited thereto.

[0023] The mounting base 2, orifice plate 3, ceramic sealing ball and ball seat 6, guide body 4, armature 5, visual lift adjustment pad (11) and solenoid valve 12 are connected in sequence from top to bottom; the return oil of the common rail injector 1 flows into the armature 5 cavity formed by the three components of solenoid valve 12, visual lift adjustment pad (11) and guide body 4 through the low pressure flow channel of mounting base 2, the low pressure flow channel of orifice plate 3 and the low pressure flow channel of guide body 4, and the return oil finally flows out of the device through the spring 7 hole of solenoid valve 12 and back pressure valve 13, thereby creating a medium environment for the armature 5 under test that is the same as the actual working state.

[0024] The mounting base 2 connects to the high-pressure oil source 15 at its high-pressure oil inlet and to the oil outlet inlet of the orifice plate 3 at its other end. A ceramic sealing ball and a ball seat 6 are installed on the cone surface of the orifice plate 3 outlet. An armature 5 is installed on the ball seat, and a spring 7 is installed on the armature 5. A throttling orifice is installed at the high-pressure oil inlet, and the size of the throttling orifice is designed according to the size of the oil inlet orifice of the orifice plate 3 to ensure that the flow of the medium in the oil outlet orifice of the orifice plate 3 during the electromagnet's attraction is similar to the actual working state, thus ensuring test accuracy.

[0025] The beam of light source 9 passes through the scattering film 10, then through the visualization lift adjustment pad 11, and finally enters the high-speed camera 8. After the solenoid valve 12 gives the drive signal, the high-speed camera 8 records the motion process of the armature 5. Then, it processes the armature disk images at different times, extracts the displacement at each time, and finally obtains the motion process of the armature 5.

[0026] For the working state of the injector under different loads, the oil-gas mixing state and the position of the gas-liquid interface in the armature 5 cavity can be observed through the visualization window. In addition, by adjusting the back pressure valve 13, the oil-gas mixing state in the armature 5 cavity can be changed, and the influence of the oil-gas mixing state on the movement process of the armature 5 can be analyzed.

[0027] As mentioned above, for reference Figure 2 As shown, this application also provides a method for visually testing the armature of an injector, including the following steps: Step S1: The common rail injector 1 and the mounting base 2 are respectively connected to the high-pressure oil source; Step S2: The industrial control computer sends two injector drive signals according to the set parameters to drive the common rail injector 1 and the solenoid valve 12 respectively. In step S3, the return oil from the common rail injector flows through the low-pressure flow channel of the mounting base 2, the low-pressure flow channel of the orifice plate 3, and the low-pressure flow channel of the guide body 4 into the armature 5 chamber formed by the three components of the solenoid valve 12, the visual lift adjustment pad (11) and the guide body 4, and the return oil finally flows out through the spring hole of the solenoid valve 12 and the back pressure valve 13. Step S4: For the working state of the injector under different loads, observe the oil-gas mixing state and the gas-liquid interface position in the armature 5 chamber through the visual lift adjustment pad 11. Step S5: After the solenoid valve 12 gives the drive signal, the high-speed camera 8 records the motion process of the armature 5. Then, the images of the armature at different times are processed to extract the displacement at each time and obtain the motion process of the armature 5. Step S6: Adjust the back pressure valve 13 to change the oil-gas mixing state in the armature 5 cavity, and repeat step S5 to analyze the influence of the oil-gas mixing state on the movement process of the armature 5.

[0028] In summary, the beneficial effects of the testing device and testing method introduced above include, but are not limited to, enabling the testing of the armature motion law under real oil return conditions, and analyzing the influence of the oil return state on the armature motion process.

[0029] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any variations and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the invention, fall within the protection scope defined by the claims of the present invention.

Claims

1. A visual testing device for fuel injector armatures, characterized in that, include: Common rail injector (1). It also includes: armature (5) and guide body (4); The test components include: orifice plate (3), ceramic sealing ball and ball seat (6), high-speed camera (8), light source (9), scattering film (10), solenoid valve (12), visual lift adjustment pad (11), back pressure valve (13), and mounting base (2). Among them, the mounting base (2), orifice plate (3), ceramic sealing ball and ball seat (6), guide body (4), armature (5), visual lift adjustment pad (11) and solenoid valve (12) are connected in sequence from bottom to top; The return oil port of the common rail injector (1) flows into the armature cavity formed by the three components of the mounting base (2), the orifice plate (3), and the guide body (4) through the low-pressure flow channel of the mounting base (2), the orifice plate (3), and the guide body (4), and the return oil finally flows out through the spring hole of the solenoid valve and the back pressure valve (13); The high-pressure oil inlet of the mounting base (2) is connected to the high-pressure common rail pipe, and the other end is connected to the oil outlet inlet of the orifice plate (3). The ceramic sealing ball and ball seat (6) are set on the outlet cone surface of the orifice plate (3), the armature (5) is set on the ball seat, and the spring is set on the armature (5). The light beam from the light source (9) passes through the scattering film (10), then through the visualization lift adjustment pad (11), and finally enters the high-speed camera (8).

2. The testing apparatus according to claim 1, characterized in that: The common rail injector (1) has oil return including: gap leakage oil return and pilot valve dynamic oil return. The types of injectors applicable to the injector include diesel, calibration pump oil, and low carbon / zero carbon fuel.

3. The testing apparatus according to claim 1, characterized in that: The visual lift adjustment pad (11) is one of a sapphire lift adjustment pad, a quartz lift adjustment pad, or an acrylic lift adjustment pad.

4. A method for visually testing the armature of an injector, used in the testing apparatus as described in claim 1, characterized in that, Includes the following steps: Step S1, the common rail injector (1) and the mounting base (2) are respectively connected to the high-pressure oil source; Step S2: The industrial control computer gives two injector drive signals according to the set parameters, which drive the common rail injector (1) and the solenoid valve (12) respectively. In step S3, the return oil from the common rail injector flows through the low-pressure flow channel of the mounting base (2), the low-pressure flow channel of the orifice plate (3), and the low-pressure flow channel of the guide body (4) into the armature (5) cavity formed by the three components: the solenoid valve (12), the visual lift adjustment pad (11), and the guide body (4). The return oil finally flows out through the spring hole of the solenoid valve (12) and the back pressure valve (13). Step S4: For the working state of the injector under different loads, observe the oil-gas mixing state and gas-liquid interface position in the armature (5) cavity through the visual lift adjustment pad (11); Step S5: After the solenoid valve (12) gives the drive signal, the high-speed camera (8) records the motion process of the armature (5), and then processes the armature disk images at different times to extract the displacement at each time and obtain the motion process of the armature (5). Step S6: Adjust the back pressure valve (13) to change the oil-gas mixing state in the armature (5) cavity, and repeat step S5 to analyze the influence of the oil-gas mixing state on the movement process of the armature (5).

5. The method for visually testing the armature of an injector according to claim 4, characterized in that, The common rail injector (1) has oil return including: gap leakage oil return and pilot valve dynamic oil return. The types of injectors applicable to the injector include diesel, calibration pump oil, and low carbon / zero carbon fuel.

6. The method for visually testing the armature of an injector according to claim 4, characterized in that, The visual lift adjustment pad (11) is one of a sapphire lift adjustment pad, a quartz lift adjustment pad, or an acrylic lift adjustment pad.

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