Engine intake manifold flow test bench and test method

Abstract

The invention discloses an engine intake manifold flow test bench and a test method, and belongs to the technical field of engine test equipment. The frequency converter is electrically connected with the fan, the fan is communicated with the pressure stabilizing box, the pressure stabilizing box is provided with a butterfly valve, the pressure stabilizing box is communicated with the pressure stabilizing barrel through an air inlet channel, the air inlet channel is provided with an air inlet flow meter and an air inlet flow differential pressure sensor, the pressure stabilizing barrel is communicated with the momentum meter, and the momentum meter penetrates through the test bed table to be communicated with the simulation cylinder sleeve. The test bed table is connected with the simulation cylinder sleeve and provided with a valve lift adjusting mechanism, the valve lift adjusting mechanism is provided with a push rod, and the push rod is provided with a displacement sensor and driven by a stepping motor. Through technical innovation and system integration, a full-process solution from test design, data acquisition to performance evaluation is constructed, powerful technical support is provided for research and development, optimization and quality control of the engine intake manifold, and the method has profound significance in promoting technical progress and product upgrading of the engine industry.

Description

Technical Field

[0001] The present invention belongs to the technical field of engine test equipment, and specifically relates to an engine intake manifold flow test bench and a test method. Background Art

[0002] The intake manifold is an important component of an engine, and its function is to guide the gas into the intake ports of each cylinder. Good intake manifold performance can reduce the intake resistance of the engine and lower the thermal load. However, the current test methods are not sufficient to accurately measure the gas flow in the intake manifold, and it is not possible to more effectively grasp the information of each intake manifold during the development stage, which brings after-sales risks to the mass production of the intake manifold. Summary of the Invention

[0003] To solve the problems in the background art, the present invention provides an engine intake manifold flow test bench and a test method.

[0004] To achieve the above object, the present invention adopts the following technical solution: An engine intake manifold flow test bench includes a frequency converter, a fan, a pressure stabilizing box, a displacement sensor, a pressure stabilizing barrel, a momentum meter, a simulated cylinder liner, a valve lift adjusting mechanism, a stepping motor, a test bench table, an intake air flow meter, an intake air flow differential pressure sensor, an intake port, a push rod and a butterfly valve;

[0005] The frequency converter is electrically connected to the fan, the fan is communicated with the pressure stabilizing box, a butterfly valve is arranged on the pressure stabilizing box, the pressure stabilizing box is communicated with the pressure stabilizing barrel through the intake port, an intake air flow meter and an intake air flow differential pressure sensor are arranged on the intake port, the upper end of the pressure stabilizing barrel is fixedly communicated with the momentum meter, the momentum meter passes through the test bench table and is communicated with the simulated cylinder liner, the lower end of the test bench table is fixedly connected with the momentum meter, the upper end of the test bench table is fixedly connected with the simulated cylinder liner, a valve lift adjusting mechanism is arranged on the test bench table, a push rod is arranged on the valve lift adjusting mechanism, a displacement sensor is arranged on the push rod, and the push rod is driven by a stepping motor.

[0006] The displacement sensor, the momentum meter, the intake air flow meter and the intake air flow differential pressure sensor are respectively electrically connected to corresponding acquisition instruments, each acquisition instrument is electrically connected to a computer through a data transmission line, and the computer is electrically connected to the frequency converter through a data transmission line.

[0007] The method includes the following steps:

[0008] S1. Install the intake manifold on the corresponding cylinder head and conduct a comprehensive inspection to ensure that it is correctly installed and can work normally;

[0009] S2. Use a tooling to firmly fix and connect the cylinder head and the simulated cylinder liner to ensure the stability and sealing of the connection;

[0010] S3. Ensure smooth connection between the intake manifold and the simulated cylinder liner to enable smooth air flow;

[0011] S4. Fine-tune the position of the valve lift adjustment mechanism so that the push rod accurately corresponds to the valve on the cylinder head, preparing for accurate control of valve lift subsequently;

[0012] S5. Conduct a strict seal test on the entire device to check whether there is air leakage at each connection part. If the seal test is qualified, proceed to step S6; if not, make targeted adjustments to the device and then conduct the seal test again until it is qualified;

[0013] S6. Drive the push rod to open the valve on the cylinder head through a stepper motor. Meanwhile, the displacement sensor measures the displacement of the push rod in real time to obtain the valve lift data, which is transmitted to the corresponding acquisition instrument in sequence and finally transmitted to the computer for recording and analysis;

[0014] S7. Open the butterfly valve on the pressure stabilizing tank and control the frequency converter through the computer, and then turn on the fan. The operation of the fan sucks air into the intake manifold, and the air flows through the simulated cylinder liner, momentum meter, pressure stabilizing barrel, intake passage and pressure stabilizing tank in sequence to form a stable air flow;

[0015] S8. The displacement sensor, momentum meter, intake air flow meter and intake air flow differential pressure sensor collect their respective data through the corresponding acquisition instruments and accurately transmit these data to the computer for subsequent data analysis;

[0016] S9. Conduct flow tests on the cylinder flow channels of the intake manifold in a predetermined order, and conduct at least two tests on each airway to ensure the accuracy and reliability of the test data. During the test, if serious faults occur, such as equipment damage or abnormal data, immediately terminate the test;

[0017] S10. Conduct a reliability check on the intake manifold, including checking whether its appearance is damaged and whether the connection parts are loose, ensuring that the intake manifold can still work normally after the test is completed, providing guarantee for subsequent use or further testing;

[0018] S11. Finally, the computer comprehensively evaluates the data collected by multiple acquisition instruments, and obtains the flow characteristics, swirl or tumble intensity performance indicators of the intake manifold through preset algorithms and standards, providing a basis for the design and optimization of the intake manifold.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. Precise testing of flow characteristics: By precisely adjusting the fan speed through a frequency converter, regulating the air flow with a pressure stabilizing box and a butterfly valve, providing a stable and precisely controllable air flow environment for the intake manifold, and accurately measuring the air volume entering the intake manifold with an intake air flow meter, it is possible to achieve precise testing of the flow characteristics of the intake manifold, providing an accurate basis for the design and optimization of the intake manifold.

[0021] 2. Comprehensive evaluation of swirl or tumble intensity: Measuring the swirl or tumble intensity of the intake manifold with a momentum meter can comprehensively evaluate the air flow motion characteristics of the intake manifold under different working conditions, helping to deeply understand the influence of the intake manifold on the engine combustion process, and thus making targeted optimizations and improvements.

[0022] 3. Precise control of valve lift: The valve lift adjustment mechanism combines a stepper motor to drive a push rod, enabling precise control of the valve lift. The displacement sensor measures the displacement of the push rod in real time to obtain valve lift data, ensuring accurate simulation of the valve opening degree during the test, making the test results closer to the actual working state of the engine, and improving the accuracy of the test.

[0023] 4. Ensure the stability and reliability of the test: The pressure stabilizing barrel provides a constant pressure drop environment for the test, ensuring the stability of the air flow pressure during the test; the data transmission systems of various sensors, data acquisition instruments, and computers can collect and record test data in real time and accurately, reducing human errors; strict sealing tests are carried out on the device to ensure that there is no air leakage at each connection part, further improving the stability and reliability of the test.

[0024] 5. Ensure the reliability of the intake manifold: After the test, conduct reliability inspections on the intake manifold, including appearance inspections and connection part inspections, to ensure that the intake manifold can still work normally after the test, providing guarantee for subsequent use or further testing, and also helping to evaluate the durability of the intake manifold during the test.

[0025] 6. Comprehensive evaluation of performance indicators: The computer, as the command center of the entire test system, comprehensively evaluates the data collected by multiple data acquisition instruments, and obtains performance indicators such as the flow characteristics, swirl or tumble intensity of the intake manifold through preset algorithms and standards, providing comprehensive data support for the design and optimization of the intake manifold, and helping to improve the overall performance of the engine.

[0026] In summary, the flow test bench and test method for the engine intake manifold, through technological innovation and system integration, have constructed a full-process solution from test design, data acquisition to performance evaluation, providing strong technical support for the research and development, optimization and quality control of the engine intake manifold, and having far-reaching significance for promoting the technological progress and product upgrading of the engine industry. Description of the Drawings

[0027] Figure 1 is the overall structural schematic diagram of the present invention;

[0028] Figure 2 is the schematic diagram of the test process of the present invention; Specific Embodiment

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0030] This embodiment describes an engine intake manifold flow test bench, which includes a frequency converter 1, a fan 2, a pressure stabilizing box 3, a displacement sensor 7, a pressure stabilizing barrel 9, a momentum meter 10, a simulated cylinder liner 11, a valve lift adjusting mechanism 12, a stepping motor 13, a test bench table 14, an intake air flow meter 15, an intake air flow differential pressure sensor 16, an intake air passage 17, a push rod 18 and a butterfly valve 19;

[0031] The frequency converter 1 is electrically connected to the fan 2, the fan 2 is communicated with the pressure stabilizing box 3, a butterfly valve 19 is arranged on the pressure stabilizing box 3, the pressure stabilizing box 3 is communicated with the pressure stabilizing barrel 9 through the intake air passage 17, an intake air flow meter 15 and an intake air flow differential pressure sensor 16 are arranged on the intake air passage 17, the upper end of the pressure stabilizing barrel 9 is fixedly communicated with the momentum meter 10, the momentum meter 10 passes through the test bench table 14 and is communicated with the simulated cylinder liner 11, the lower end of the test bench table 14 is fixedly connected with the momentum meter 10, the upper end of the test bench table 14 is fixedly connected with the simulated cylinder liner 11, a valve lift adjusting mechanism 12 is arranged on the test bench table 14, a push rod 18 is arranged on the valve lift adjusting mechanism 12, a displacement sensor 7 is arranged on the push rod 18, and the push rod 18 is driven by a stepping motor 13.

[0032] The displacement sensor 7, the momentum meter 10, the intake air flow meter 15 and the intake air flow differential pressure sensor 16 are respectively electrically connected to the corresponding acquisition instrument 5, each acquisition instrument 5 is electrically connected to the computer 4 through a data transmission line, and the computer 4 is electrically connected to the frequency converter 1 through a data transmission line.

[0033] The method includes the following steps:

[0034] S1. Install the intake manifold 6 on the corresponding cylinder head 8 and conduct a comprehensive inspection to ensure that it is correctly installed and can work normally;

[0035] S2. Use a tooling to firmly fix and connect the cylinder head 8 and the simulated cylinder liner 11 to ensure the stability and sealing of the connection;

[0036] S3. Ensure smooth connection between the intake manifold 6 and the simulated cylinder liner 11 so that air can flow smoothly;

[0037] S4. Fine-tune the position of the valve lift adjustment mechanism 12 so that the push rod 18 accurately corresponds to the valve on the cylinder head 8, preparing for accurate control of the valve lift subsequently;

[0038] S5. Conduct a strict sealing test on the entire device, check whether there is air leakage at each connection part. If the sealing test is qualified, proceed to step S6; if not, make targeted adjustments to the device and then conduct the sealing test again until it is qualified;

[0039] S6. Drive the push rod 18 to open the valve on the cylinder head 8 through the stepper motor 13. Meanwhile, the displacement sensor 7 measures the displacement of the push rod 18 in real time, thereby obtaining the valve lift data. The data is transmitted to the corresponding collector 5 in sequence and finally transmitted to the computer 4 for recording and analysis;

[0040] S7. Open the butterfly valve 19 on the pressure stabilizing tank 3, and control the frequency converter 1 through the computer 4, and then start the fan 2. The operation of the fan 2 sucks air into the intake manifold 6. The air flows through the simulated cylinder liner 11, the momentum meter 10, the pressure stabilizing barrel 9, the intake passage 17 and the pressure stabilizing tank 3 in sequence, forming a stable air flow;

[0041] S8. The displacement sensor 7, the momentum meter 10, the intake flowmeter 15 and the intake flow differential pressure sensor 16 collect their respective data through the corresponding collector 5 and accurately transmit these data to the computer 4 for subsequent data analysis;

[0042] S9. Conduct flow tests on the cylinder flow channels of the intake manifold 6 in a predetermined order, and conduct at least two tests on each airway to ensure the accuracy and reliability of the test data. During the test, if serious faults occur, such as equipment damage or abnormal data, immediately terminate the test;

[0043] S10. Conduct a reliability check on the intake manifold 6, including checking whether its appearance is damaged and whether the connection parts are loose, ensuring that the intake manifold can still work normally after the test is completed, providing guarantee for subsequent use or further testing;

[0044] S11. Finally, the computer 4 comprehensively evaluates the data collected by multiple collectors 5, and through preset algorithms and standards, obtains the flow characteristics, eddy current or tumble intensity performance indicators of the intake manifold, providing a basis for the design and optimization of the intake manifold.

[0045] The working principle of an engine intake manifold flow test bench is mainly based on the coordinated operation of its various components to achieve accurate testing of the intake manifold flow. The following is a detailed explanation of the working principle of this test bench and its test method:

[0046] The frequency converter 1 is used to adjust the speed of the fan 2, thereby controlling the air flow rate into the intake manifold. The fan 2 is responsible for providing the fresh air required for the test. The pressure stabilizing box 3 is connected to the fan 2, and a butterfly valve 19 is provided inside it to adjust the air flow. The main function of the pressure stabilizing box 3 is to provide a stable air flow environment to ensure the constancy of the air flow pressure during the test. The displacement sensor 7 is used to measure the displacement of the push rod 18 in real time, thereby obtaining the valve lift data. The valve lift adjustment mechanism 12 is responsible for adjusting the opening degree of the valve. The stepping motor 13 drives the push rod 18 to move, and then drives the valve lift adjustment mechanism 12 to achieve precise control of the valve lift. The pressure stabilizing barrel 9 provides a constant pressure drop environment for the test. The momentum meter 10 is used to measure the intake manifold swirl or tumble intensity. The simulated cylinder liner 11 simulates the actual working environment of the engine, making the test closer to the real situation. The intake air flow meter 15 is used to measure the air volume entering the intake manifold, and the intake air flow differential pressure sensor 16 measures the change in the intake duct differential pressure. The acquisition instrument 5 is responsible for collecting the data of each sensor and transmitting it to the computer 4 for processing and analysis. The computer 4, as the command center of the entire test system, is responsible for controlling the test process, recording data, and performing subsequent data analysis.

[0047] Working principle of the test method:

[0048] Install the intake manifold 6 on the corresponding cylinder head 8 and conduct a comprehensive inspection. Use a tooling fixture to firmly connect the cylinder head 8 to the simulated cylinder liner 11 (the tooling fixture is a prior art, i.e., CN222049585U), and ensure smooth communication between the intake manifold 6 and the simulated cylinder liner 11. Conduct a strict seal test on the entire device to ensure that there is no air leakage at each connection part. If the seal test is unqualified, make targeted adjustments to the device and then conduct the test again until it is qualified. Drive the push rod 18 to open the valve on the cylinder head 8 through the stepper motor 13. The displacement sensor 7 measures the displacement of the push rod 18 in real time to obtain the valve lift data. These data are transmitted to the computer 4 through the data collector 5 for recording and analysis. Open the butterfly valve 19 on the pressure stabilizing tank 3, and control the frequency converter 1 to start the fan 2 through the computer 4. The operation of the fan 2 causes air to be inhaled into the intake manifold 6, flowing successively through the simulated cylinder liner 11, the momentum meter 10, the pressure stabilizing barrel 9, the intake passage 17, and the pressure stabilizing tank 3 to form a stable air flow. During this process, the displacement sensor 7, the momentum meter 10, the intake air flowmeter 15, and the intake air flow differential pressure sensor 16 collect their respective data through the corresponding data collectors 5 and transmit these data to the computer 4 for subsequent analysis. The computer 4 conducts a comprehensive evaluation of the data collected by multiple data collectors 5, and through preset algorithms and standards, obtains the flow characteristics, swirl or tumble intensity performance indicators of the intake manifold. These data provide an important basis for the design and optimization of the intake manifold.

[0049] In summary, the engine intake manifold flow test bench and test method achieve accurate testing and performance evaluation of the intake manifold flow through precise control of the air flow, real-time data acquisition, and comprehensive data analysis. Each labeled component plays a key role in the testing process, jointly ensuring the accuracy and reliability of the testing.

[0050] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent conditions of the claims in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. An engine intake manifold flow test bench, characterized in that: It includes an inverter (1), a fan (2), a pressure stabilizing box (3), a displacement sensor (7), a pressure stabilizing barrel (9), a momentum meter (10), an analog cylinder liner (11), a valve lift adjusting mechanism (12), a stepper motor (13), a test bench table (14), an intake air flow meter (15), an intake air flow differential pressure sensor (16), an intake passage (17), a push rod (18), and a butterfly valve (19); The inverter (1) is electrically connected to the fan (2), the fan (2) is communicated with the pressure stabilizing box (3), the butterfly valve (19) is arranged on the pressure stabilizing box (3), the pressure stabilizing box (3) is communicated with the pressure stabilizing barrel (9) through the intake passage (17), the intake air flow meter (15) and the intake air flow differential pressure sensor (16) are arranged on the intake passage (17), the upper end of the pressure stabilizing barrel (9) is fixedly communicated with the momentum meter (10), the momentum meter (10) passes through the test bench table (14) and is communicated with the analog cylinder liner (11), the lower end of the test bench table (14) is fixedly connected with the momentum meter (10), the upper end of the test bench table (14) is fixedly connected with the analog cylinder liner (11), the valve lift adjusting mechanism (12) is arranged on the test bench table (14), the push rod (18) is arranged on the valve lift adjusting mechanism (12), the displacement sensor (7) is arranged on the push rod (18), and the push rod (18) is driven by the stepper motor (13).

2. The flow test bench for an engine intake manifold according to claim 1, wherein: The displacement sensor (7), the momentum meter (10), the intake air flow meter (15), and the intake air flow differential pressure sensor (16) are respectively electrically connected to the corresponding acquisition instrument (5), each acquisition instrument (5) is electrically connected to the computer (4) through a data transmission line, and the computer (4) is electrically connected to the inverter (1) through a data transmission line.

3. A test method for an engine intake manifold flow test bench according to claim 2, characterized in that: The method includes the following steps: S1. Install the intake manifold (6) on the corresponding cylinder head (8) and conduct a comprehensive inspection to ensure its correct installation and normal operation; S2. Use a tooling to firmly fix and connect the cylinder head (8) and the analog cylinder liner (11) to ensure the stability and tightness of the connection; S3. Ensure smooth communication between the intake manifold (6) and the analog cylinder liner (11) to enable the smooth flow of air; S4. Fine-tune the position of the valve lift adjusting mechanism (12) so that the push rod (18) accurately corresponds to the valve on the cylinder head (8) to prepare for accurately controlling the valve lift subsequently; S5. Conduct a strict seal test on the entire device to check whether there is air leakage at each connection part. If the seal test is qualified, proceed to step S6; if not, make targeted adjustments to the device and then conduct the seal test again until it is qualified; S6. Drive the push rod (18) to open the valve on the cylinder head (8) through the stepper motor (13), and at the same time, the displacement sensor (7) measures the displacement of the push rod (18) in real time, thereby obtaining the valve lift data. The data is sequentially transmitted to the corresponding acquisition instrument (5) and finally transmitted to the computer (4) for recording and analysis; S7. Open the butterfly valve (19) on the pressure stabilizing tank (3), and control the frequency converter (1) through the computer (4), and then start the fan (2). The operation of the fan (2) causes air to be inhaled into the intake manifold (6). The air flows through the simulated cylinder liner (11), the momentum meter (10), the pressure stabilizing barrel (9), the intake passage (17) and the pressure stabilizing tank (3) in sequence to form a stable air flow. S8. The displacement sensor (7), the momentum meter (10), the intake air flow meter (15) and the intake air flow differential pressure sensor (16) respectively collect their own data through the corresponding acquisition instruments (5), and accurately transmit these data to the computer (4) for subsequent data analysis. S9. Conduct flow tests on the cylinder passages of the intake manifold (6) in a predetermined order. Each airway is tested at least twice to ensure the accuracy and reliability of the test data. During the test, if serious faults occur, such as equipment damage and abnormal data, the test shall be terminated immediately. S10. Conduct a reliability check on the intake manifold (6), including checking whether its appearance is damaged and whether the connection parts are loose, to ensure that the intake manifold can still work normally after the test is completed, providing guarantee for subsequent use or further testing. S11. Finally, the computer (4) comprehensively evaluates the data collected by multiple acquisition instruments (5), and obtains the flow characteristics, swirl or tumble intensity performance indicators of the intake manifold through preset algorithms and standards, providing a basis for the design and optimization of the intake manifold.

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