Machine vision self-calibration fuel injection quantity testing device based on weighing method

Abstract

The invention provides a machine vision self-calibration oil injection quantity testing device based on a weighing method, which comprises an oil injector, a measuring cylinder with scale marks, an oil discharge pipe, a three-way bypass valve, an oil drainage upper pipe, an oil drainage valve, an oil drainage lower pipe and an oil tank which are sequentially arranged from top to bottom, the oil drainage lower pipe extends into the oil tank, and the upper part of the oil tank is connected to an oil well pump through an oil return pipe; an oil pumping pipe is installed above the oil well pump and located above the beaker, a bypass pipe, a bypass valve and a bypass oil falling pipe are sequentially installed on one side of the three-way bypass valve, the end of the bypass oil falling pipe is located above the beaker, the beaker is located above the electronic scale, and a high-speed camera is installed on one side of the oil sprayer. According to the machine vision self-calibration fuel injection quantity testing device based on the weighing method, the weighing method and the machine vision method are combined, non-contact high-precision measurement of the fuel injection quantity is achieved, and the measurement accuracy is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of engine fuel injection testing, and particularly relates to a machine vision self-calibration fuel injection quantity testing device based on the weighing method. Background Art

[0002] During the research and development and production process of engines, accurately measuring the fuel injection quantity of fuel injectors is crucial. Most existing fuel injection quantity testing devices are contact measurements. Affected by the accuracy of sensors or manual readings, etc., there are problems such as insufficient measurement accuracy, complex operation, and long measurement time, and it is difficult to meet the accuracy requirements of fuel injection quantity under the rapid research needs of modern engines. The root cause of the above problems is mainly that traditional measurement methods only rely on a single test method and cannot comprehensively consider the influence of various factors on the fuel injection quantity, resulting in low test efficiency and insufficient accuracy. Summary of the Invention

[0003] In view of this, the present invention aims to propose a machine vision self-calibration fuel injection quantity testing device based on the weighing method, coupling the high-precision weighing method and the high-efficiency machine vision method to achieve high-precision, real-time, and automated measurement of the fuel injection quantity of fuel injectors, improving the test efficiency while meeting the accuracy requirements for fuel injection quantity measurement.

[0004] To achieve the above object, the technical solution of the present invention is realized as follows: A machine vision self-calibration fuel injection quantity testing device based on the weighing method includes a fuel injector, a graduated cylinder with scale lines, a drain pipe, a three-way bypass valve, an upper drain pipe, a drain valve, a lower drain pipe, and a fuel tank arranged in sequence from top to bottom. The lower drain pipe extends into the fuel tank. The fuel tank is also connected to a fuel pump through a return pipe above. A suction pipe is installed above the fuel pump, and the suction pipe is located above a beaker. A bypass pipe, a bypass valve, and a bypass down pipe are installed in sequence on one side of the three-way bypass valve, and the end of the bypass down pipe is located above the beaker. The beaker is located above an electronic scale, and a high-speed camera is installed on one side of the fuel injector.

[0005] Further, the three-way bypass valve includes an oil inlet of the three-way bypass valve, a rotary gear selector, a rotary oil passage, a closed position, a bypass position pipeline, and an oil drain position pipeline. The rotary gear selector rotates at different angles to drive the rotary oil passage to communicate with the closed position, the bypass position pipeline, and the oil drain position pipeline respectively. The closed position is used to close the oil drain or bypass channel below the measuring cylinder, so that the oil in the measuring cylinder accumulates during the fuel injection process, and the change in the liquid level height can be accurately reflected on the scale and can be accurately recorded by the high-speed camera. The bypass position of the three-way bypass valve realizes the connection between the oil inlet of the three-way bypass valve and the bypass pipe by connecting the rotary oil passage with the bypass position pipeline. When the bypass valve is opened, the oil flows into the beaker through the bypass down pipe and is weighed in cooperation with the electronic scale. The oil drain position of the three-way bypass valve realizes the connection between the oil inlet of the three-way bypass valve and the oil drain upper pipe by connecting the rotary oil passage with the oil drain position pipeline.

[0006] Further, the bypass valve is used to control the on-off of the oil flowing into the beaker through the bypass down pipe.

[0007] Further, the oil pump is used to pump the oil measured in the beaker back to the fuel tank through the oil suction pipe.

[0008] Further, the oil drain valve is used to control the on-off of the oil flowing back to the fuel tank through the oil drain lower pipe.

[0009] Further, the high-speed camera is used to record the liquid level height in the measuring cylinder before and after fuel injection respectively.

[0010] Compared with the prior art, the machine vision self-calibration fuel injection volume testing device based on the weighing method of the present invention has the following advantages: (1) The machine vision self-calibration fuel injection volume testing device based on the weighing method of the present invention combines the weighing method and the machine vision method to realize non-contact high-precision measurement of the fuel injection volume and improve the measurement accuracy.

[0011] (2) The machine vision self-calibration fuel injection volume testing device based on the weighing method of the present invention has a high degree of automation, can efficiently monitor the fuel injection process, and greatly improves the test efficiency.

[0012] (3) The machine vision self-calibration fuel injection volume testing device based on the weighing method of the present invention has a reasonable structural design, and each component works together with strong stability, and is suitable for testing various fuel injectors. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 Schematic diagram of the machine vision self-calibration fuel injection volume testing device based on the weighing method according to the embodiment of the present invention; Figure 2 Schematic diagram of the three-way bypass valve according to the embodiment of the present invention.

[0014] Explanation of reference numerals: 1. Fuel injector; 2. Measuring cylinder; 3. Scale line; 4. Drain pipe; 5. Three-way bypass valve; 5-1. Inlet of the three-way bypass valve; 5-2. Rotary gear shifter; 5-3. Rotary oil passage; 5-4. Closed gear; 5-5. Bypass gear pipeline; 5-6. Oil drain gear pipeline; 6. Bypass pipe; 7. Bypass valve; 8. Bypass drain pipe; 9. Suction pipe; 10. Beaker; 11. Electronic scale; 12. Oil pump; 13. Return pipe; 14. Upper oil drain pipe; 15. Oil drain valve; 16. Lower oil drain pipe; 17. Fuel tank; 18. High-speed camera. Detailed implementation manners

[0015] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0016] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0017] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0018] The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0019] A machine vision self-calibration fuel injection volume testing device based on the weighing method, as Figure 1 and Figure 2 shown, includes an injector 1, a graduated cylinder 2 with scale lines 3, a drain pipe 4, a three-way bypass valve 5, an upper drain pipe 14, a drain valve 15, a lower drain pipe 16, and a fuel tank 17 arranged in sequence from top to bottom. The lower drain pipe 16 extends into the fuel tank 17. The upper part of the fuel tank 17 is also connected to a fuel pump 12 through a return pipe 13. An oil suction pipe 9 is installed above the fuel pump 12, and the oil suction pipe 9 is located above a beaker 10. A bypass pipe 6, a bypass valve 7, and a bypass down pipe 8 are installed in sequence on one side of the three-way bypass valve 5. The end of the bypass down pipe 8 is located above the beaker 10. An electronic scale 11 is installed below the beaker 10, and a high-speed camera 18 is installed on one side of the injector 1.

[0020] The three-way bypass valve 5 is composed of a three-way bypass valve oil inlet 5-1, a rotary gear shifter 5-2, a rotary oil passage 5-3, a closed position 5-4, a bypass position pipeline 5-5, and a drain position pipeline 5-6. By rotating the rotary gear shifter 5-2 in the three-way bypass valve 5 at different angles, the rotary oil passage 5-3 is respectively connected to the closed position 5-4, the bypass position pipeline 5-5, and the drain position pipeline 5-6, so that the three-way bypass valve 5 has three positions, namely the closed position, the bypass position, and the drain position.

[0021] The closed position 5-4 is used to close the drain or bypass channel below the graduated cylinder 2, so that the oil liquid accumulates in the graduated cylinder 2 during the fuel injection process. The change in the liquid level height can be accurately reflected on the scale 3 and can be accurately recorded by the high-speed camera 18.

[0022] The bypass position of the three-way bypass valve 5 realizes the connection between the three-way bypass valve oil inlet 5-1 and the bypass pipe 6 by connecting the rotary oil passage 5-3 with the bypass position pipeline 5-5. When the bypass valve 7 is opened, the oil liquid flows into the beaker 10 through the bypass down pipe 8 and is weighed and measured in cooperation with the electronic scale 11; The drain position of the three-way bypass valve 5 realizes the connection between the three-way bypass valve oil inlet 5-1 and the upper drain pipe 14 by connecting the rotary oil passage 5-3 with the drain position pipeline 5-6. When the drain valve 15 is opened after the conventional test, the oil liquid is quickly drained through the lower drain pipe 16.

[0023] The oil suction pipe 9 connects the beaker 10 and the fuel pump 12, and the beaker 10 is placed on the electronic scale 11. During self-calibration, the weight difference of the oil liquid in the beaker 10 before and after each injection is measured in real time by the electronic scale 11, and the single fuel injection volume is calculated accordingly.

[0024] The high-speed camera 18 is used to record the liquid level height in the measuring cylinder 3 before and after fuel injection respectively. By combining the liquid level height difference with the weighing data, self-calibration of the fuel injection amount measured by the machine vision system is achieved.

[0025] The bypass pipe 6 is sequentially connected to the bypass valve 7 and the bypass drain pipe 8 below. And the bypass valve 7 is used to control the on-off of the oil passing through the bypass drain pipe 8 and flowing into the beaker 10.

[0026] The oil drain upper pipe 14 is connected to the oil drain valve 15 and the oil drain lower pipe 16 below it. The oil drain valve 15 is used to control the on-off of the oil flowing back to the fuel tank 17 through the oil drain lower pipe 16, realizing rapid oil drainage.

[0027] The oil pump 12 is used to pump the measured oil in the beaker 10 back to the fuel tank through the oil suction pipe 9, realizing the recycling of the oil.

[0028] The working principle of a machine vision self-calibration fuel injection amount test device based on the weighing method is as follows: In the first step of self-calibration, the three-way bypass valve 5 is adjusted to the closed position. After the high-speed camera 18 takes a picture and records the initial scale in the measuring cylinder 2, the fuel injector 1 starts to inject. After one injection is completed, the high-speed camera 18 takes a picture and records the final scale in the measuring cylinder 2, and calculates the volume change value through the liquid level height. In the second step of self-calibration, after the electronic scale 11 weighs and measures and records the initial weight of the oil in the beaker 10, the three-way bypass valve 5 is adjusted to the bypass position. At this time, the bypass valve 7 is also opened, and the oil enters the beaker 10 under the action of gravity. When the reading of the electronic scale no longer changes, record the final weight of the oil in the beaker 10, and calculate the fuel injection amount change value through the weight difference. After at least five or more fuel injection amount tests with different pulse widths, a correction coefficient between the recorded value of the high-speed camera 18 and the weighing value of the electronic scale 11 is formed, realizing machine vision self-calibration based on the weighing method.

[0029] In the first step of the formal test, the three-way bypass valve 5 is adjusted to the closed position. After the high-speed camera 18 takes a picture and records the initial scale in the measuring cylinder 2, the fuel injector 1 starts to inject. After one injection is completed, the high-speed camera 18 takes a picture and records the final scale in the measuring cylinder 2, and calculates the accurate fuel injection amount by combining the liquid level height with the calibration coefficient. In the second step of the formal test, the three-way bypass valve 5 is adjusted to the oil drain position. At this time, the oil drain valve 15 is also opened, and the oil enters the fuel tank 17 under the action of gravity, realizing the purpose of rapid oil drainage.

[0030] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A machine vision self-calibration fuel injection quantity testing device based on the weighing method, characterized in that: It includes an injector, a graduated cylinder with scale lines, an oil drain pipe, a three-way bypass valve, an upper oil drain pipe, an oil drain valve, a lower oil drain pipe, and a fuel tank, which are arranged in sequence from top to bottom. The lower oil drain pipe extends into the fuel tank. The upper part of the fuel tank is also connected to a fuel pump through a return pipe. A suction pipe is installed above the fuel pump, and the suction pipe is located above the beaker. A bypass pipe, a bypass valve, and a bypass drain pipe are sequentially installed on one side of the three-way bypass valve. The end of the bypass drain pipe is located above the beaker. The beaker is located above an electronic scale, and a high-speed camera is installed on one side of the injector.

2. The machine vision self-calibration fuel injection quantity testing device based on the weighing method according to claim 1, wherein: The three-way bypass valve includes a three-way bypass valve inlet, a rotary gear shifter, a rotary oil passage, a closed position, a bypass position pipeline, and an oil drain position pipeline. Rotating the rotary gear shifter at different angles drives the rotary oil passage to communicate with the closed position, the bypass position pipeline, and the oil drain position pipeline respectively. The closed position is used to close the oil drain or bypass channel below the graduated cylinder, so that the oil in the graduated cylinder accumulates during the injection process, and the change in the liquid level height can be accurately reflected on the scale and can be accurately recorded by the high-speed camera. The bypass position of the three-way bypass valve realizes the connection between the three-way bypass valve inlet and the bypass pipe by communicating the rotary oil passage with the bypass position pipeline. When the bypass valve is opened, the oil flows into the beaker through the bypass drain pipe for weighing measurement in cooperation with the electronic scale. The oil drain position of the three-way bypass valve realizes the connection between the three-way bypass valve inlet and the upper oil drain pipe by communicating the rotary oil passage with the oil drain position pipeline.

3. The machine vision self-calibration fuel injection quantity testing device based on the weighing method according to claim 1, wherein: The bypass valve is used to control the on-off of the oil flowing into the beaker through the bypass drain pipe.

4. A machine vision self-calibration fuel injection quantity testing device based on the weighing method according to claim 1, characterized in that: The fuel pump is used to pump the measured oil in the beaker back to the fuel tank through the suction pipe.

5. The machine vision self-calibration fuel injection quantity testing device based on the weighing method according to claim 1, wherein: The oil drain valve is used to control the on-off of the oil flowing back to the fuel tank through the lower oil drain pipe.

6. The machine vision self-calibration fuel injection quantity testing device based on the weighing method according to claim 1, wherein: The high-speed camera is used to record the liquid level height in the graduated cylinder before and after injection respectively.

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