Natural gas engine EGR uniformity test control device

Abstract

The utility model provides a natural gas engine EGR uniformity test control device, and relates to the technical field of engines, the natural gas engine EGR uniformity test control device comprises rack equipment and an engine, each cylinder of the engine is provided with a gas taking tool, the gas taking tools are communicated with the rack equipment, an electromagnetic valve is arranged between each gas taking tool and the rack equipment, and the rack equipment is communicated with the rack equipment. And the rack equipment controls each electromagnetic valve to be independently opened and closed through an ECU (Electronic Control Unit) of the engine. In the application, a technician operates the rack equipment to sequentially and accurately control the independent opening and closing of each electromagnetic valve through the ECU so as to sequentially measure the EGR rate of each cylinder during working, and the opening and closing can also be manually controlled, so that the experiment efficiency and the data accuracy are improved.

Description

Technical Field

[0001] The present application relates to the technical field of engines, and more specifically, to a control device for the EGR uniformity test of a natural gas engine. Background Art

[0002] Currently, the national VI natural gas engine system mainly adopts stoichiometric combustion and exhaust gas recirculation technology. Among them, the EGR technology mainly involves the exhaust gas after combustion flowing into the intake pipe through the external EGR pipeline after cooling, and participating in the combustion process again. Different proportions of the exhaust gas entering each cylinder to participate in the combustion again will affect the combustion uniformity of each cylinder, which may cause phenomena such as engine knocking and misfiring, and have an adverse impact on the economy, reliability, and comfort of the engine.

[0003] In summary, it is particularly important to research and develop the EGR rate of each cylinder of a natural gas engine. Therefore, it is necessary to test and analyze the EGR entering each cylinder to explore the factors affecting the EGR uniformity of each cylinder. EGR test equipment is expensive, and it is often impossible to monitor the EGR rate of each cylinder simultaneously, and each cylinder needs to be measured separately. Therefore, when measuring the EGR rate of a certain cylinder, in order to avoid inaccurate data caused by the interference of the EGR rate of the remaining cylinders, a set of EGR control devices is required to improve the test efficiency on the premise of ensuring accurate test data. Summary of the Invention

[0004] In order to overcome the existing deficiencies, the embodiments of the present application provide a control device for the EGR uniformity test of a natural gas engine, which can solve the problems mentioned in the above background art.

[0005] The technical solution adopted by the embodiments of the present application to solve its technical problems is: a control device for the EGR uniformity test of a natural gas engine, including a test bench device and an engine. An air intake tooling is provided for each cylinder of the engine, and the air intake tooling is communicated with the test bench device. A solenoid valve is provided between each air intake tooling and the test bench device, and the test bench device controls the independent switching of each solenoid valve through the engine's ECU.

[0006] In a specific implementation, the test bench device further includes an exhaust gas analyzer and a combustion analyzer.

[0007] In a specific implementation, the test bench device further includes a monitoring computer.

[0008] In a specific implementation, the air intake tooling is fixedly installed on the intake manifold of the engine.

[0009] In a specific implementation, the air intake tooling and the solenoid valve are also installed at the intake end of the intake manifold.

[0010] In a specific embodiment, the air intake tooling includes an air intake pipe, and an air intake hole is formed at the inner end of the air intake pipe.

[0011] In a specific embodiment, a threaded seat is rotatably connected to the rear end of the air intake pipe, and the threaded seat is screwed to the intake manifold.

[0012] In a specific embodiment, the air intake tooling further includes a hoop and a hose. The hose is fixedly sleeved on the rear end of the air intake pipe through the hoop, and the other end of the hose is communicated with the bench equipment.

[0013] The advantages of the embodiments of the present application are as follows:

[0014] Technicians operate the bench equipment to precisely control the independent switching of each solenoid valve in sequence through the ECU, and then measure the EGR rate during the operation of each cylinder in sequence. It is also possible to manually control the switch, which improves the experimental efficiency and the accuracy of data. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of the natural gas engine EGR uniformity test control device provided by the embodiment of the present application;

[0016] Figure 2 It is a schematic structural diagram of the connection relationship between the air intake tooling and the intake manifold of the engine provided by the embodiment of the present application;

[0017] Figure 3 It is a schematic structural diagram of the connection relationship between the air intake tooling and the solenoid valve provided by the embodiment of the present application;

[0018] Figure 4 It is a schematic structural diagram of the connection relationship between the threaded seat and the air intake pipe provided by the embodiment of the present application.

[0019] In the figure: 10 - bench equipment; 20 - engine; 30 - air intake tooling; 31 - air intake pipe; 32 - air intake hole; 33 - threaded seat; 34 - hoop; 35 - hose; 40 - solenoid valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The technical solutions in the embodiments of the present application are to solve the problems mentioned in the above background technology, and the general idea is as follows:

[0021] Please refer to Figures 1-4, A natural gas engine EGR uniformity test control device, including a test bench equipment 10 and an engine 20. Each cylinder of the engine 20 is provided with an air intake tooling 30, and the air intake tooling 30 is communicated with the test bench equipment 10. A solenoid valve 40 is arranged between each air intake tooling 30 and the test bench equipment 10. The test bench equipment 10 controls the independent switching of each solenoid valve 40 through the ECU of the engine 20. Among them, the technician operates the test bench equipment 10 to precisely control the independent switching of each solenoid valve 40 through the ECU in sequence, and then measures the EGR rate when each cylinder is working in sequence. It is also possible to manually control the switch, which improves the experimental efficiency and the accuracy of the data.

[0022] Please refer to Figures 1-4 , The test bench equipment 10 also includes an exhaust gas analyzer and a combustion analyzer. Here, the combustion analyzer monitors and analyzes parameters such as pressure and temperature during the combustion process, helps to understand the combustion situation in the combustion chamber, evaluates the influence of EGR on combustion, and is used to measure the components in the exhaust gas, such as nitrogen oxides NOx, carbon monoxide CO, hydrocarbons HC, etc. Through the data of the exhaust gas analyzer, the improvement effect of EGR on exhaust gas emissions can be evaluated.

[0023] Please refer to Figures 1-4 , The test bench equipment 10 also includes a monitoring computer. Here, the data collected by various sensors and analyzers are summarized, processed and stored, and the technician can control the opening and closing of the solenoid valve 40 through the monitoring software on the computer.

[0024] Please refer to Figures 1-4 , The air intake tooling 30 is fixedly installed on the intake manifold of the engine 20. Here, the air intake tooling 30 is installed on the intake manifold in advance. When the intake manifold is installed on the cylinder block of the engine 20, the air intake tooling 30 naturally inserts into the cylinder.

[0025] Please refer to Figures 1-4 , The air intake tooling 30 and the solenoid valve 40 are also installed on the intake end of the intake manifold. Here, the intake manifold extracts gas through the air intake tooling 30 before dispersing the intake air, that is, the EGR main pipeline, which is used to comprehensively evaluate the intake air quality and flow rate, and then understand the gas conditions entering the entire intake system, including the total flow rate, temperature, pressure, etc., to provide basic data for the intake control of the entire engine 20, and can also monitor the mixing effect of EGR gas and fresh air: ensure that the EGR gas is fully and evenly mixed with fresh air in the intake manifold to achieve the best combustion and emission performance.

[0026] Please refer to Figures 1-4 , The air intake tooling 30 includes an air intake pipe 31, and an air intake hole 32 is opened at the inner end of the air intake pipe 31. Here, the air intake holes 32 are evenly distributed around the inner end of the air intake pipe 31, which is beneficial to uniform air intake.

[0027] Please refer toFigures 1-4 At the rear end of the air intake pipe 31, there is a rotatably connected threaded seat 33, and the threaded seat 33 is screwed to the intake manifold. Here, the air intake pipe 31 is installed on the intake manifold through the threaded seat 33, and a sealing tape is wound to ensure airtightness.

[0028] Please refer to Figures 1-4 The air intake tooling 30 further includes a hose clamp 34 and a hose 35. The hose 35 is fixedly sleeved on the rear end of the air intake pipe 31 through the hose clamp 34, and the other end of the hose 35 is communicated with the bench equipment 10. Here, the hose 35 is fixedly sleeved on the rear end of the air intake pipe 31 through the hose clamp 34, and then the hose 35 is connected to the bench equipment 10.

[0029] When this application is used: the air intake tooling 30 is respectively installed on each air outlet of the intake manifold of the engine 20 and at the air inlet of the intake manifold, and the overall intake air and the intake air of each cylinder can be sampled respectively and sent to the bench equipment 10 for analysis. By using the spare pin of the ECU to connect the switches of the 7 solenoid valves 40, the temporary control variables are increased. The technician can send a switch signal from the monitoring software in the computer, and the switch signal is processed by the ECU to control the opening and closing of the solenoid valve 40. When testing the EGR of a certain cylinder, the solenoid valve 40 at the air inlet end of the intake manifold, that is, the EGR main pipe, and the solenoid valves 40 of the pipelines of the other cylinders are closed through the control software. When the EGR rate measured by the bench is stable, the data is recorded, and the EGR rates of each cylinder during operation can be obtained by successive tests.

[0030] In summary, the technician operates the bench equipment 10 to accurately control the independent switching of each solenoid valve 40 in sequence through the ECU, and then measures the EGR rate of each cylinder during operation in sequence. It is also possible to manually control the switch, which improves the experimental efficiency and the accuracy of the data.

[0031] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly illustrating the present invention, rather than limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A test control device for the EGR uniformity of a natural gas engine, characterized in that It includes a bench equipment and an engine. An air intake tooling is provided for each cylinder of the engine. The air intake tooling is communicated with the bench equipment. An electromagnetic valve is provided between each air intake tooling and the bench equipment. The bench equipment controls the independent switching of each electromagnetic valve through the engine's ECU.

2. The natural gas engine EGR uniformity test control device according to claim 1, characterized in that, The bench equipment further includes an exhaust gas analyzer and a combustion analyzer.

3. The natural gas engine EGR uniformity test control device according to claim 2, characterized in that, The bench equipment further includes a monitoring computer.

4. The natural gas engine EGR uniformity test control device according to claim 3, wherein The air intake tooling is fixedly installed on the intake manifold of the engine.

5. The natural gas engine EGR uniformity test control device according to claim 4, characterized in that The air intake tooling and the electromagnetic valve are also installed on the intake end of the intake manifold.

6. The natural gas engine EGR uniformity test control device according to claim 5, characterized in that, The air intake tooling includes an air intake pipe, and an air intake hole is provided at the inner end of the air intake pipe.

7. The natural gas engine EGR uniformity test control device according to claim 6, characterized in that A threaded seat is rotatably connected to the rear end of the air intake pipe, and the threaded seat is screwed to the intake manifold.

8. The natural gas engine EGR uniformity test control device according to claim 7, characterized in that, The air intake tooling further includes a hoop and a hose. The hose is fixedly sleeved on the rear end of the air intake pipe through the hoop, and the other end of the hose is communicated with the bench equipment.

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