An EGR one-way valve opening pressure and opening feedback detection device and method

Abstract

The present invention relates to an EGR one-way valve opening pressure and opening feedback detection device and method, comprising: the front end and the rear end of the simulation valve body are respectively provided with an input flange with an input pressure sensor and an output flange with an output pressure sensor; a side transparent observation window is provided on one side of the simulation valve body, a camera is provided outside the side transparent observation window, a laser displacement sensor is provided outside the top transparent observation window, and a triangular prism simulation valve seat and a reed as a valve flap are provided in the simulation valve body. The present invention simulates the opening of the EGR one-way valve reed through a closed simulation valve body with a transparent window, and uses a camera and a laser displacement sensor to record the various states of the reed movement and deformation, thereby obtaining various working parameters of the reed, providing accurate data for the actual use of the reed, so as to solve the problems of one-way valve reed opening pressure detection and reed opening value detection under different pressures. The present invention has a simple structure, is easy to use, and has high detection accuracy.

Description

Technical Field

[0001] The invention relates to an EGR one-way valve opening pressure and opening feedback detection device and method, which is a detection equipment and method, and is a device and method for detecting the performance of a special one-way valve of an EGR system of an automobile engine. Background Art

[0002] In the EGR system of a turbocharged automobile engine, under low engine speed conditions, the compressor boost pressure may be higher than the pre-turbo pressure. If the EGR valve is opened at this time, fresh air will flow back to the exhaust manifold, affecting exhaust and causing the engine combustion efficiency to decrease. To solve this problem, the following two solutions are generally used to prevent air "backflow". The first method is to use a lift-type EGR valve to control the system to close, but there is a response lag problem; the second is to use a check valve to prevent backflow. The check valve can be a reed check valve with a simple structure. On the premise of effectively preventing the intake system from flowing back into the exhaust manifold, the exhaust pressure pulse under various engine working conditions is used to open the check valve reed to achieve exhaust gas recirculation. The check valve is used in working conditions where reverse flow is not allowed. The reed check valve has a simple structure, is easy to install and use, and is very suitable for preventing air backflow in the EGR system. The problem is that the reed used in the reed check valve is affected by the material, and the elastic deformation performance of each batch cannot be completely consistent, resulting in differences in the pressure and opening degree of the check valve opening and closing of each batch. How to determine these differences and make the opening and opening degree of the one-way valve consistent is a problem that needs to be solved. Summary of the invention

[0003] In order to overcome the problems of the prior art, the present invention proposes an EGR one-way valve opening pressure and opening feedback detection device and method. The device and method simulate the opening and closing environment of the one-way valve, accurately detect the opening and opening of the one-way valve reed, and provide material data for the one-way valve reed.

[0004] The objective of the present invention is achieved as follows: an EGR one-way valve opening pressure and opening feedback detection device comprises: a simulation valve body, wherein the front end and the rear end of the simulation valve body are respectively provided with an input flange with an input pressure sensor and an output flange with an output pressure sensor, wherein the input flange is connected to a pressure source through a pipeline, and the output flange is connected to a pressure regulating exhaust end through a pipeline; a side surface of the simulation valve body is provided with a side transparent observation window, a camera is provided outside the side transparent observation window, a top transparent observation window is provided at the top of the simulation valve body, a laser displacement sensor is provided outside the top transparent observation window, a triangular prism simulation valve seat is provided in the simulation valve body, the three prisms of the triangular prism simulation valve seat are interconnected, one of the prisms is communicated with the air flow channel of the input flange, and the other two prisms are respectively installed with reeds as valve flaps, the laser displacement sensor can illuminate the reed through the top transparent observation window, and the swinging state of the reed is set in the field of view of the camera through the side transparent observation window.

[0005] Furthermore, the simulated valve body is a rectangular prism frame made of metal, the bottom of which is closed and fixedly connected to the base, the left and right sides and the top are closed by transparent material and fixed with bolts, and the front and rear ends are respectively connected to the input flange and the input flange bolts.

[0006] Furthermore, the input flange and the input flange are respectively connected to the large end of a section of a reducer, the small end of the reducer is connected to a section of a straight pipe, and the straight pipe section is provided with a clamp.

[0007] Furthermore, the base is provided with a pan head for fixing the camera.

[0008] Furthermore, a laser displacement sensor bracket is provided on the top of the simulated valve body.

[0009] Furthermore, the laser displacement sensor bracket is provided with a long hole for adjusting the lateral movement of the laser displacement sensor.

[0010] Furthermore, the laser displacement sensor bracket is provided with an arc-shaped long hole for adjusting the swing of the laser displacement sensor.

[0011] Furthermore, a limiting plate is provided outside the reed.

[0012] Furthermore, the limit plate is of a grid type, and the spring and the limit plate are fixed together with bolts.

[0013] A method for detecting the opening pressure and opening degree feedback of an EGR one-way valve using the above device, the steps of the method are as follows:

[0014] Step 1, install the reed: fix the reed to be tested together with the limit plate on the triangular prism simulated valve seat, cover it, fix it with bolts and seal each transparent observation window;

[0015] Step 2, opening pressure detection: gradually increase the ventilation pressure at the air inlet end. When the pressure increases to the point where gas flows out of the simulated valve body, it is the opening pressure of the one-way valve. Record the pressure difference between the inlet and outlet when the one-way valve is opened.

[0016] Step 3, opening detection: detect the opening of the reed when the one-way valve is forward ventilated, input pressure 0~100KPa, measure once every 1KPa in the range of 0~10KPa, and measure once every 10KPa in the range of 10~100KPa. Use a camera to capture the deformation of the reed each time, and use a laser displacement sensor to record the displacement of the reed.

[0017] The advantages and beneficial effects of the present invention are as follows: the present invention simulates the opening of the EGR check valve reed through a closed simulated valve body with a transparent window, and uses a camera and a laser displacement sensor to record the various states of the reed action and deformation, thereby obtaining various working parameters of the reed, providing accurate data for the actual use of the reed, and solving the problems of the one-way valve reed opening pressure detection and the reed opening value detection under different pressures. The present invention has a simple structure, is easy to use, has a high detection accuracy, and can meet the detection requirements of the EGR check valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0019] Figure 1 It is a schematic diagram of the structure of the device described in Embodiments 1, 2 and 7 of the present invention;

[0020] Figure 2 is a schematic diagram of the structure of the device described in Embodiments 1, 2, 4 and 6 of the present invention, Figure 1 A-direction view;

[0021] Figure 3 is a schematic diagram of the structure of the limiting plate according to the eighth embodiment of the present invention;

[0022] Figure 4 is a schematic diagram of the structure of the grid-shaped limiting plate according to the ninth embodiment of the present invention, Figure 3 Center B view. DETAILED DESCRIPTION

[0023] Embodiment 1:

[0024] This embodiment is an EGR one-way valve opening pressure and opening feedback detection device, such as Figure 1 , 2This embodiment includes: a simulated valve body 1, the front and rear ends of the simulated valve body are respectively provided with an input flange 2 with an input pressure sensor 201 and an output flange 3 with an output pressure sensor 301, the input flange is connected to the pressure source through a pipeline, and the output flange is connected to the pressure regulating exhaust end through a pipeline; a side transparent observation window 101 is provided on one side of the simulated valve body, and a camera 4 is provided outside the side transparent observation window, as shown in FIG. Figure 2 ( Figure 1 The camera is not shown in the figure), the top of the simulated valve body is provided with a top transparent observation window 102, and a laser displacement sensor 5 is provided outside the top transparent observation window. The simulated valve body is provided with a triangular prism simulated valve seat 6, and the three edges of the triangular prism simulated valve seat are interconnected, one of which is connected to the air flow channel of the input flange, and the other two edges are respectively installed with reeds 7 as valve flaps. The laser displacement sensor can illuminate the reed through the top transparent observation window, and the swinging state of the reed is set in the field of view of the camera through the side transparent observation window.

[0025] The EGR one-way valve opening pressure and opening feedback detection device described in this embodiment generally includes a simulated valve body, an intake and exhaust connection assembly, a laser displacement sensor and a camera. The connection assembly may include a straight pipe section, a reducer, and a flange welded together, a pressure sensor connector is provided on the flange, and a quick clamp connected to the intake and exhaust hoses is provided at the end of the above connection assembly. The simulated valve body includes a reed that carries a one-way valve disc, and the simulated valve seat is a closed container with a transparent window. The simulated valve body and other facilities can be installed on the bottom plate to form a whole detection device.

[0026] In this embodiment, the reed to be tested is installed on a valve seat of a special simulated valve body, and air pressure is applied in the simulated valve body to simulate the working state of the EGR system, so that the reed moves and deforms, simulating the working state of the reed valve disc, and using a camera and a laser displacement sensor to record the various states of the reed movement and deformation, thereby obtaining various working parameters of the reed, providing accurate data for the actual use of the reed.

[0027] During the test, after the reed of the one-way valve is installed into the simulated valve seat, the output air pressure enters the simulated valve body until the reed is pushed open to release the pressure. At this time, the output pressure sensor has a pressure reading, indicating that the one-way valve has been opened. The pressure difference between the input and output sensors is the opening pressure of the one-way valve, and the pressure difference generally does not exceed 2.5kPa. The input air pressure of the test bench gradually increases from 0 to 100kPa, and the reed opening gradually increases synchronously. In the range of 0 to 10Kpa, it is measured once every 1Kpa; in the range of 10 to 100Kpa, it is measured once every 10Kpa. Colorless transparent glass is installed on the top and left and right of the simulated valve body. The upper laser displacement sensor can read the reed opening value, and high-speed cameras can be used on both sides to take images of the reed opening.

[0028] It should be noted that the terms “front”, “rear”, “left”, “right”, “upper (top)” and “lower (bottom)” in the following embodiments of this embodiment are all based on Figure 1 The view direction in the figure is based on the right side of the figure, the front side, the left side of the figure is the back side, the paper surface is the right side, the paper inside is the left side, and the top, bottom and Figure 1 The upper and lower parts are consistent.

[0029] The simulated valve body described in this embodiment is a pressure vessel that carries a one-way valve, and can be a rectangular metal frame, such as an aluminum alloy frame, with a closed bottom, front and rear input flanges and output flanges sealed with bolts, and both sides and the top are sealed with colorless transparent glass bolts with a frame around them. A bottom plate can be set at the bottom of the simulated valve body, and a pan / tilt for fixing a camera is set on the bottom plate.

[0030] The input flange and the output flange are used to connect the pipeline to the simulated valve seat. The flange is also provided with a joint for connecting the pressure sensor, which can be a metal national standard part, fixed on the flange to connect the pressure sensor. A sealing rubber gasket can be arranged between the input flange, the output flange and the simulated valve seat to maintain the air pressure in the simulated valve seat. The input flange and the output flange are connected to a reducer. This reducer can adopt a national standard reducer, which is used to match the input and output air pressure flow with the volume flow of the one-way valve. The reducer is connected to a straight pipe section, and the straight pipe section can adopt a national standard seamless steel pipe, which is used for the test bench air pressure input and output. A clamp is arranged on the straight pipe section, and the clamp can adopt a metal national standard part, which is used to connect the pressure source or the pressure regulating exhaust end through a hose.

[0031] The pressure source is a power source that provides air pressure, and can be an air compressor or other facilities to simulate the working air pressure of the one-way valve in the EGR system. The pressure regulating exhaust end can be an outlet connected to the atmosphere, and a valve can be set on the outlet. By setting the opening of the valve, the exhaust volume is adjusted to simulate the working environment of the one-way valve in the EGR system. The pressure sensor connector can adopt a quick-plug structure, which is convenient and fast to connect and reliable in function.

[0032] The laser displacement sensor is used to timely feedback the reed opening under different pressure differential conditions, and a commercially available laser sensor can be used. The laser displacement sensor can be installed on a special laser displacement sensor bracket, which is fixed on the simulated valve body or on the input flange or output flange, and is provided with a long hole for fixing to adjust the position of the laser displacement sensor and find the best laser irradiation point.

[0033] The camera can be a general camera or a general camera head, which is fixed on the base through a pan head or other connecting brackets. In order to make the reed in the field of view of the camera, a certain distance needs to be maintained between the camera and the transparent observation window, and the purpose of shooting a clear reed image is achieved by adjusting the focus.

[0034] The valve seat is a triangular frame, which is hollow and closed at both ends. The three edges are connected to each other. One of the edges is connected to the input channel on the input flange, and the other two edges are fixed to one end of two spring leaves by bolts. The other end of the spring leaf is a free end, which can bend under the air pressure at the input end to open the valve.

[0035] To limit the opening degree of the reed, a limit plate can be fixed together with a bolt fixing the reed. The limit plate can be a bent metal plate, and the degree of its bending is the maximum angle of the reed swing.

[0036] Embodiment 2:

[0037] The present embodiment is an improvement on the above embodiment, and is a refinement of the above embodiment regarding the simulated valve body. The simulated valve body described in the present embodiment is a rectangular prism frame made of metal, the bottom of which is closed and fixedly connected to the base, the left and right sides and the top are closed by transparent material and fixed with bolts, and the front and rear ends are respectively connected to the input flange and the input flange bolts.

[0038] The simulated valve body frame is composed of metal profiles or plates, which saves costs and is easy to manufacture while ensuring the design cavity. The frame is made of bent metal plates or profiles to form a hexahedral frame, in which the bottom is closed with a metal plate, and bolt holes connected to the input flange and output flange are set on the front and back sides, and bolt holes connected to the transparent glass frame are set on the top and both sides. Sealing gaskets are used between the flange and the glass frame and the simulated valve body frame to make the simulated valve body frame and the flange and glass frame airtight.

[0039] Colorless transparent glass is set above the simulated valve seat frame, and the glass is surrounded by a metal frame to set bolt holes. The metal frame and the glass must also be sealed. The light transmittance of the colorless transparent glass should be above 90%. The colorless transparent glass on the top of the simulated valve seat allows the laser emitted by the laser displacement sensor to irradiate the reed, and the laser reflected by the reed can pass through the colorless transparent glass back to the laser displacement sensor to detect the opening of the reed under different pressure differences. The colorless transparent glass set on both sides of the simulated valve seat is conducive to the high-speed camera to capture the action image of the reed under the action of air pressure.

[0040] Embodiment three:

[0041] This embodiment is an improvement of the above embodiment, and is a refinement of the above embodiment regarding the input flange and the input flange. The input flange and the input flange described in this embodiment are respectively connected to the large end of a section of a reducer 8, and the small end of the reducer is connected to a section of a straight pipe, and the straight pipe section is provided with a clamp 9. Figure 1 , 2 .

[0042] The reducer is a tube with one end larger than the other, which is used to diffuse or collect the flowing gas. The reducer is used for transition so that the gas flow rate matches the volume flow rate of the one-way valve, the air pressure is stable, and the feedback data is accurate.

[0043] Using clamp connection makes it quicker and more convenient to assemble or disassemble the pipeline, and it is easy to replace the reed under test.

[0044] Embodiment 4:

[0045] This embodiment is an improvement of the above embodiment, and is a refinement of the base of the above embodiment. The base of this embodiment is provided with a pan head 401 for fixing the camera. Figure 2 shown.

[0046] The pan head is a device that can adjust the camera's field of view, and can be used to swing the camera up and down or left and right to find the best shooting position. The pan head can be a general pan head or a simplified pan head, such as fixing the corresponding height and only needing to swing left and right.

[0047] Embodiment five:

[0048] This embodiment is an improvement of the above embodiment, and is a refinement of the above embodiment regarding the simulated valve body. A laser displacement sensor bracket is provided on the top of the simulated valve body described in this embodiment.

[0049] One end (fixed end) of the laser displacement sensor bracket can be fixed to the top of the simulated valve body by bolts, or it can be fixed to the input flange (such as Figure 1 , 2 The end of the laser displacement sensor that is combined with the simulated valve body or the input and output flange can be equipped with a long hole to adjust the front and rear position of the laser displacement sensor and find the best position for irradiating the reed. The bolt hole that combines the laser displacement sensor bracket with the laser displacement sensor can be designed as a round hole with a circular arc long hole to form a swing to adjust the front and rear position of the laser displacement sensor.

[0050] Embodiment six:

[0051] This embodiment is an improvement of the above embodiment, and is a refinement of the above embodiment regarding the laser displacement sensor support. The laser displacement sensor support described in this embodiment is connected to the simulated valve body with a long hole 502, such as Figure 2 shown.

[0052] The connecting hole between the bracket and the flange is a long hole, so that the entire bracket has adjustment margin to the left and right sides of the simulated valve body.

[0053] Embodiment seven:

[0054] This embodiment is an improvement of the above embodiment, and is a refinement of the laser displacement sensor bracket of the above embodiment. The laser displacement sensor bracket described in this embodiment is provided with an arc-shaped long hole 503 for adjusting the swing of the laser displacement sensor. Figure 1 shown.

[0055] The laser displacement sensor bracket and the laser displacement sensor are first connected with a circular through hole and then connected with an arc-shaped long hole. The arc-shaped long hole cooperates with the circular hole to form a swing adjustment of the laser displacement sensor line to adjust the laser irradiation point to ensure it is on the reed.

[0056] Embodiment eight:

[0057] This embodiment is an improvement of the above embodiment, and is a refinement of the above embodiment regarding the reed. The reed described in this embodiment is further provided with a limiting plate 701. Figure 3 , 4 shown.

[0058] To prevent the reed from being bent too much and plastically deformed and damaged when the airflow through the reed is too large, a limit plate is provided outside the reed in this embodiment. The limit plate can be made of a solid plate material with a gap to allow the laser beam to pass through the grid and reach the reed.

[0059] Embodiment nine:

[0060] This embodiment is an improvement of the above embodiment, and is a refinement of the above embodiment regarding the limit plate. The limit plate described in this embodiment is in a grid shape, and the spring and the limit plate are fixed together with bolts 702, such as Figure 3 , 4 shown.

[0061] In order to allow the laser to pass through the limiting plate, the limiting plate is designed to be grid-shaped in this embodiment, and the limiting plate is fixed by bolts for fixing the spring sheet, so that the entire structure is simple and easy to use.

[0062] Embodiment ten:

[0063] The present embodiment is a method for detecting the opening pressure and opening degree feedback of an EGR one-way valve using the above-mentioned device. The method first uses a clamp to connect the gas source and the exhaust section. The gas flow is expanded at the input end through a reducer to match the volume of the simulated valve body. After the gas enters the valve seat of the simulated valve body, the value of the pressure sensor at the input begins to increase. At this time, the output pressure sensor does not respond. When the pressure reaches a certain value, the output pressure sensor begins to respond, indicating that the reed of the one-way valve has been opened. At this time, the difference between the input pressure sensor and the output pressure sensor is the valve opening pressure. After that, the input pressure is gradually increased and the opening degree of the reed is recorded. The above process can be summarized into two detection items:

[0064] Item 1, one-way valve opening pressure test: gradually increase the ventilation pressure at the inlet end of the one-way valve. When the pressure increases to the point where gas flows out of the valve body being tested, record the pressure difference between the inlet and outlet when the one-way valve is opened.

[0065] Item 2, one-way valve opening test: detect the opening of the reed when the valve is ventilated in the forward direction, with an input pressure of 0~100KPa. In the range of 0~10KPa, measure once every 1KPa, and in the range of 10~100KPa, measure once every 10KPa.

[0066] The specific steps of the method are as follows:

[0067] Step 1, install the reed: fix the reed to be tested together with the limit plate on the triangular prism simulated valve seat, cover it, fix it with bolts and seal each transparent observation window;

[0068] The premise of this step is that the position and focus of the camera, as well as the position of the laser displacement sensor, have been adjusted and can work normally, that is, the camera can clearly capture the deformation of the reed, and the laser displacement sensor can accurately measure the deformation and displacement of the reed. At the same time, the input and output pipes of the airflow have been installed and connected and can work normally. At this time, the glass of the transparent observation window is removed, and the reed and the limit plate are installed on the simulated valve seat and fixed with bolts. Then install the glass of the transparent observation window. Check again whether the camera and laser sensor are still in a position where they can perform detection correctly.

[0069] Step 2, opening pressure detection: gradually increase the ventilation pressure at the air inlet end. When the pressure increases to the point where gas flows out of the simulated valve body, it is the opening pressure of the one-way valve. Record the pressure difference between the inlet and outlet when the one-way valve is opened.

[0070] This step mainly monitors the input pressure sensor and the output pressure sensor. When the input pressure gradually increases, the input pressure sensor begins to display a pressure value (the initial pressure value is set to zero under atmospheric pressure), and the output pressure sensor has no value display. When the value on the input pressure sensor reaches a certain value, the output pressure sensor displays, indicating that the reed has moved and the one-way valve is opened. At this time, the pressure values ​​of the input and input sensors are recorded, which is the opening pressure of the reed of the one-way valve being tested.

[0071] Step 3, opening detection: detect the opening of the reed when the one-way valve is forward ventilated, input pressure 0~100KPa, measure once every 1KPa in the range of 0~10KPa, and measure once every 10KPa in the range of 10~100KPa. Use a camera to capture the deformation of the reed each time, and use a laser displacement sensor to record the displacement of the reed.

[0072] As the pressure continues to increase, the reed deforms and tilts more and more, and eventually it will stick to the limit plate. At this time, the opening of the one-way valve is the maximum.

[0073] The opening pressure detection and opening degree detection of a set of one-way valve reeds can be performed multiple times, and the average value can be calculated to obtain more accurate one-way valve reed parameters.

[0074] Finally, it should be noted that the above is only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred arrangement scheme, a person skilled in the art should understand that the technical solution of the present invention (such as the form of the simulated valve, the form of the valve flap, the sequence of steps, etc.) can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A method for detecting the opening pressure and opening degree feedback of an EGR one-way valve, the device used in the method comprising: A simulated valve body, wherein the front and rear ends of the simulated valve body are respectively provided with an input flange with an input pressure sensor and an output flange with an output pressure sensor, the input flange is connected to a pressure source through a pipeline, and the output flange is connected to a pressure regulating exhaust end through a pipeline; a side surface of the simulated valve body is provided with a side transparent observation window, a camera is provided outside the side transparent observation window, a top transparent observation window is provided on the top of the simulated valve body, a laser displacement sensor is provided outside the top transparent observation window, a triangular prism simulated valve seat is provided in the simulated valve body, the three prism faces of the triangular prism simulated valve seat are interconnected, one of the prism faces is communicated with the air flow channel of the input flange, and the other two prism faces are respectively installed with reeds as valve flaps, the laser displacement sensor can illuminate the reed through the top transparent observation window, and the swinging state of the reed can be seen through the side transparent observation window The simulation valve body is arranged in the field of view of the camera; the simulation valve body is a rectangular prism frame made of metal, the bottom is closed and fixedly connected to the base, the left and right sides and the top are closed by transparent materials and fixed by bolts, and the front and rear ends are respectively connected to the input flange and the output flange bolts; the input flange and the output flange are respectively connected to the large end of a section of a reducer, and the small end of the reducer is connected to a section of a straight pipe, and the straight pipe section is provided with a clamp; the base is provided with a pan / tilt for fixing the camera; the top of the simulation valve body is provided with a laser displacement sensor bracket; the laser displacement sensor bracket is provided with a long hole for adjusting the lateral movement of the laser displacement sensor; the laser displacement sensor bracket is provided with an arc-shaped long hole for adjusting the swing of the laser displacement sensor; a limit plate is also provided outside the reed; the limit plate is a grid type, and the reed and the limit plate are fixed together with bolts; it is characterized in that the steps of the method are as follows: Step 1, install the reed: fix the reed to be tested together with the limit plate on the triangular prism simulated valve seat, cover it, fix it with bolts and seal each transparent observation window; Step 2, opening pressure detection: gradually increase the ventilation pressure at the air inlet end. When the pressure increases to the point where gas flows out of the simulated valve body, it is the opening pressure of the one-way valve. Record the pressure difference between the inlet and outlet when the one-way valve is opened. Step 3, opening detection: detect the opening of the reed when the one-way valve is forward ventilated, input pressure 0~100KPa, measure once every 1KPa in the range of 0~10KPa, and measure once every 10KPa in the range of 10~100KPa. Use a camera to capture the deformation of the reed each time, and use a laser displacement sensor to record the displacement of the reed.

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