Test platform for measuring spraying characteristics of diesel engine under ultrahigh pressure condition

Abstract

The utility model belongs to the field of diesel engine spray characteristic test, and particularly relates to a diesel engine spray characteristic measurement test platform under an ultrahigh pressure condition, which comprises an oil tank, a high-pressure oil pump, a common rail pipe, a supercharging device, an oil sprayer, a constant-volume combustion bomb, a spray image acquisition device and a control unit, the oil tank is connected with the high-pressure oil pump through a pipeline, the high-pressure oil pump is connected with the common-rail pipe through a pipeline, the common-rail pipe is connected with the supercharging device through a pipeline, the supercharging device is connected with the oil sprayer through a pipeline, and the output end of the oil sprayer is arranged in the constant-volume combustion bomb. The spray image acquisition device acquires a spray image in the constant volume combustion bomb; and a control circuit of the supercharging device, a control circuit of the oil sprayer and a control circuit of the spray image acquisition device are all connected with the control unit. The device is simple in design and reliable in performance, and can test the spraying characteristics of the diesel engine under the condition of ultrahigh-pressure injection. And the situation that images are not captured in time or are not captured in time can be avoided, and snapshot efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the field of diesel engine spray characteristic testing, and particularly relates to a test platform for measuring the spray characteristics of a diesel engine under ultra-high pressure conditions. Background Art

[0002] The change of injection pressure will cause the change of the in-cylinder air-fuel mixing process, which will further affect the spray characteristics of the biodiesel engine and ultimately affect the overall performance of the biodiesel engine. However, at present, there is no complete test bench for accurately measuring the spray characteristics of a biodiesel engine under ultra-high pressure injection conditions, which to a certain extent affects the overall improvement of the performance of the biodiesel engine in the full operating range. Summary of the Utility Model

[0003] The test platform for measuring the spray characteristics of a diesel engine under ultra-high pressure conditions provided by the utility model can effectively solve the problems in the background art.

[0004] The test platform for measuring the spray characteristics of a diesel engine under ultra-high pressure conditions provided by the utility model includes a fuel tank, a high-pressure oil pump, a common rail pipe, a supercharging device, an injector, a constant volume combustion bomb, a spray image acquisition device and a control unit;

[0005] The fuel tank is connected to the high-pressure oil pump through a pipeline, the high-pressure oil pump is connected to the common rail pipe through a pipeline, the common rail pipe is connected to the supercharging device through a pipeline, the supercharging device is connected to the injector through a pipeline, and the output end of the injector is arranged inside the constant volume combustion bomb;

[0006] The spray image acquisition device collects the spray image inside the constant volume combustion bomb;

[0007] The supercharging device, the injector control and the spray image acquisition device are all connected to the control unit.

[0008] As a further optimization of the utility model, the spray image acquisition device includes a spherical mirror, a light source and a high-speed digital camera;

[0009] The spherical mirror faces the transparent window of the constant volume combustion bomb; the light source irradiates on the spherical mirror; the high-speed digital camera collects the mirror image of the spherical mirror.

[0010] As a further optimization of the utility model, a filter is also provided between the fuel tank and the high-pressure oil pump.

[0011] As a further optimization of the utility model, parameter acquisition sensors are also arranged inside the constant volume combustion bomb.

[0012] As a further optimization of the utility model, the parameter acquisition sensors include a pressure sensor and a temperature sensor.

[0013] As a further optimization of the present utility model, it further includes a heating device; the heating device heats the constant-volume combustion bomb.

[0014] As a further optimization of the present utility model, it further includes a nitrogen supply device; the nitrogen supply device supplies nitrogen into the constant-volume combustion bomb.

[0015] As a further optimization of the present utility model, an oil return pipeline is also provided between the common rail pipe and the fuel tank.

[0016] As a further optimization of the present utility model, the common rail pipe is connected to the control unit.

[0017] As a further optimization of the present utility model, it further includes a rail pressure signal module, and the rail pressure signal module is connected to the control unit.

[0018] A measurement test platform for diesel engine spray characteristics under ultra-high pressure conditions provided by the present utility model has a simple design, reliable performance, and is simple to use and maintain. It can test the spray characteristics of a diesel engine under ultra-high pressure injection conditions and is suitable for popularization and application; the present utility model can also avoid untimely or missed image capture and improve the capture efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of this embodiment;

[0020] Among them, fuel tank 1, high-pressure oil pump 2, common rail pipe 3, supercharging device 4, fuel injector 5, constant-volume combustion bomb 6, spray image acquisition device 7, spherical mirror 7a, light source 7b, high-speed digital camera 7c, control unit 8, computer 9, filter 10, oil return pipeline 11, supercharging device control circuit 12, fuel injector control circuit 13, spray image acquisition device control circuit 14, common rail pipe control circuit 15, rail pressure signal line 16. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] As Figure 1 shown, this embodiment includes a fuel tank 1, a high-pressure oil pump 2, a common rail pipe 3, a supercharging device 4, a fuel injector 5, a constant-volume combustion bomb 6, a spray image acquisition device 7, and a control unit 8.

[0022] The fuel tank 1 is connected to the high-pressure oil pump 2 through a pipeline. In this embodiment, a filter 10 is also provided between the fuel tank 1 and the high-pressure oil pump 2. The diesel in the fuel tank 1 enters the high-pressure oil pump 2 after being cleaned by the filter 10. The high-pressure oil pump 2 is connected to the common rail pipe 3 through a pipeline, and the high-pressure oil pump 2 delivers the diesel to the common rail pipe 3. The common rail pipe 3 is connected to the supercharging device 4 through a pipeline, and the diesel in the common rail pipe 3 enters the supercharging device 4 for supercharging. The supercharging device 4 is connected to the fuel injector 5 through a pipeline. The output end of the fuel injector 5 is arranged inside the constant-volume combustion bomb 6. The diesel after being supercharged by the supercharging device 4 enters the fuel injector 5, and the fuel injector 5 injects the diesel into the constant-volume combustion bomb 6.

[0023] The spray image acquisition device 7 is aligned with the constant volume combustion bomb 6 and acquires the spray image inside the constant volume combustion bomb 6. Specifically, the spray image acquisition device 7 in this embodiment includes a spherical mirror 7a, a light source 7b, and a high-speed digital camera 7c. The concave surface of the spherical mirror 7a is aligned with the transparent window of the constant volume combustion bomb 6. Two quartz transparent windows are arranged on the surface of the constant volume combustion bomb 6 opposite to each other. The light source 7b is located above between the spherical mirror 7a and the constant volume combustion bomb 6, and the high-speed digital camera 7c is located below between the spherical mirror 7a and the constant volume combustion bomb 6. The spray phenomenon formed by the fuel injector 5 injecting diesel into the constant volume combustion bomb 6 is mapped on the spherical mirror 7a, and the high-speed camera captures the image on the spherical mirror 7a. The light source 7b is set to increase the light brightness and improve the effect of the captured image. In other embodiments, the spray image acquisition device 7 can also directly use a camera or a schlieren instrument.

[0024] In order to obtain more spray information, a parameter acquisition sensor is also arranged in the constant volume combustion bomb 6 in this embodiment. The parameter acquisition sensor specifically includes a pressure sensor, a temperature sensor, etc., and is used to detect parameters such as pressure and temperature during the spray process in the constant volume combustion bomb 6.

[0025] A heating device is also added in this embodiment. During the test process, the heating device is used to heat the constant volume combustion bomb 6 to simulate the cylinder wall temperature. In addition, a nitrogen supply device is also arranged in this embodiment. The nitrogen supply device supplies nitrogen into the constant volume combustion bomb 6, and the in-cylinder density at the top dead center of the diesel engine is simulated by filling nitrogen. It should be noted that in order to obtain a high-temperature and high-pressure state, the sealing performance of the constant volume combustion bomb 6 must be ensured.

[0026] A supercharger control circuit 12 for controlling the supercharger 4, an injector control circuit 13 for controlling the fuel injector 5, and a spray image acquisition device control circuit 14 for controlling the spray image acquisition device 7 are also arranged in this embodiment. These control circuits are all connected to the control unit 8. Under the control of the same control unit 8, the control signals of the supercharger 4, the fuel injector 5, and the spray image acquisition device 7 can be synchronized. The control unit 8 is externally connected to a computer 9, and the computer 9 controls the control unit 8.

[0027] Furthermore, a common rail control circuit 15 for controlling the fuel inlet of the common rail 3 is also arranged in this embodiment. The common rail control circuit 15 is connected to the control unit 8. Preferably, a rail pressure signal module is also arranged in this embodiment. The rail pressure signal module acquires the pressure signal in the common rail 3 and sends it to the control unit 8 through the rail pressure signal line 16. Therefore, the rail pressure signal line 16 is connected to the control unit 8, and the control unit 8 uses the pressure condition of the common rail 3 as the basis for controlling the supercharger 4, the fuel injector 5, and the common rail 3.

[0028] In order to make more reasonable use of diesel fuel, a return oil pipeline 11 is also provided between the common rail pipe 3 and the fuel tank 1 in this embodiment.

[0029] This embodiment is designed simply, has reliable performance, and is simple to use and maintain. It can test the spray characteristics of a diesel engine under ultra-high pressure injection conditions, and can also achieve synchronous control of the supercharger 4, the injector 5, and the spray image acquisition device 7, improving the test efficiency and avoiding the situation where the spray image acquisition device 7 fails to capture images in a timely manner or fails to capture any images.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A test platform for measuring the spray characteristics of diesel engines under ultra-high pressure conditions, characterized in that: It includes a fuel tank, a high-pressure fuel pump, a common rail pipe, a supercharging device, a fuel injector, a constant volume combustion bomb, a spray image acquisition device and a control unit; The fuel tank is connected to the high-pressure fuel pump through a pipeline, the high-pressure fuel pump is connected to the common rail pipe through a pipeline, the common rail pipe is connected to the supercharging device through a pipeline, the supercharging device is connected to the fuel injector through a pipeline, and the output end of the fuel injector is arranged in the constant volume combustion bomb; The spray image acquisition device collects the spray image in the constant volume combustion bomb; The boost device, the injector control and the spray image acquisition device are all connected to the control unit.

2. A diesel engine spray characteristics measurement test platform under ultra-high pressure conditions according to claim 1, characterized in that: The spray image acquisition device includes a spherical mirror, a light source and a high-speed digital camera; The spherical mirror faces the window of the constant volume incendiary bomb; the light source shines on the spherical mirror; and the high-speed digital camera collects the mirror image of the spherical mirror.

3. The test platform for measuring the spray characteristics of a diesel engine under ultra-high pressure conditions according to claim 1 is characterized in that: A filter is also provided between the fuel tank and the high-pressure fuel pump.

4. A diesel engine spray characteristics measurement test platform under ultra-high pressure conditions according to claim 1, characterized in that: Parameter collection sensors are also provided inside the constant volume combustion bomb.

5. A diesel engine spray characteristics measurement test platform under ultra-high pressure conditions according to claim 4, characterized in that: Parameter acquisition sensors include pressure sensors and temperature sensors.

6. The test platform for measuring the spray characteristics of a diesel engine under ultra-high pressure conditions according to claim 1 is characterized in that: It also includes a heating device; the heating device heats the constant volume combustion bomb.

7. The test platform for measuring the spray characteristics of a diesel engine under ultra-high pressure conditions according to claim 1 is characterized in that: It also includes a nitrogen supply device; the nitrogen supply device supplies nitrogen to a given volume combustion bomb.

8. The test platform for measuring the spray characteristics of a diesel engine under ultra-high pressure conditions according to claim 1 is characterized in that: The common rail pipe and the fuel tank are also provided with an oil return pipeline.

9. The test platform for measuring the spray characteristics of a diesel engine under ultra-high pressure conditions according to claim 1, characterized in that: The common rail pipe is connected to the control unit.

10. The diesel engine spray characteristics measurement test platform under ultra-high pressure conditions according to claim 1, characterized in that: It also includes a rail pressure signal module, which is connected to the control unit.

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