Engine test device and mechanical equipment for testing

Abstract

The present invention relates to the technical field of construction machinery, and particularly relates to an engine test device and a mechanical device for testing. The engine test device includes: a first pipeline adapted to be connected to the exhaust port of an engine to be tested; a second pipeline having one end forming an external air inlet, one end connected to the first pipeline, and one end adapted to communicate with the intake port of the engine to be tested, so as to mix the external air with the exhaust gas generated by the engine to be tested and then send the mixture into the intake port of the engine to be tested; an oxygen detection component for detecting the oxygen concentration in the mixed gas after mixing the external air and the exhaust gas; and a first regulating valve provided on the first pipeline to adjust the amount of exhaust gas entering the second pipeline according to the oxygen concentration detected by the oxygen detection component. The present invention uses the exhaust gas of the engine to be tested as the dilution gas for diluting the external air, simulates the low oxygen content at different altitudes, and cancels the nitrogen tank in the prior art, greatly reducing the cost.

Description

Technical Field

[0001] The present invention relates to the technical field of construction machinery, and particularly relates to an engine test device and a mechanical device for testing. Background Art

[0002] Currently, when conducting high-altitude performance tests on engines on plains, the method of restricting fuel injection quantity is adopted. For different altitudes, the fuel injection quantity is restricted within the corresponding proportion range of the normal injection quantity to simulate the low fuel injection quantity corresponding to low intake air volume. This method cannot simulate the intake air conditions of low oxygen content at high altitudes, and thus cannot truly reflect the power output of the engine in a high-altitude environment.

[0003] To solve the above problems, the prior art discloses an engine high-altitude test simulation test platform, which includes components such as a regulating valve, a vacuum pump, a nitrogen gas tank, and a pressure stabilizing tank. The nitrogen gas tank is used to adjust the oxygen content in the intake air, and the air pressure in the pressure stabilizing tank is adjusted through the vacuum pump and the regulating valve, thereby adjusting the intake air pressure. Nitrogen is used as the dilution gas to dilute the oxygen concentration in the intake air. For large mobile machinery, when simulating the environment of low oxygen content at high altitudes, the total intake air volume required for a complete high-altitude test is very large. Therefore, the required amount of nitrogen is also very large. In the whole machine test, it is obviously difficult to install a huge nitrogen gas tank, and the cost is expensive, and the system structure is complex. Under the whole machine test conditions, it is difficult to arrange the test device on the whole machine. Summary of the Invention

[0004] The main object of the present invention is to provide an engine test device for different altitudes and a mechanical device for testing, so as to solve the problems in the prior art that when using nitrogen to reduce the oxygen concentration in the intake air, the large demand for nitrogen makes it difficult to arrange a huge nitrogen gas tank and the cost is high.

[0005] To achieve the above object, the present invention provides an engine test device, including: a first pipeline, adapted to be connected to the exhaust port of the engine to be tested; a second pipeline, one end of which forms an external air inlet, one end is connected to the first pipeline, and one end is adapted to be communicated with the intake port of the engine to be tested, so as to send the mixed gas of external air and the exhaust gas generated by the engine to be tested into the intake port of the engine to be tested; an oxygen detection component, used to detect the oxygen concentration in the mixed gas after mixing the external air and the exhaust gas; a first regulating valve, arranged on the first pipeline, and according to the oxygen concentration detected by the oxygen detection component, adjusts the amount of exhaust gas entering the second pipeline.

[0006] Optionally, the engine test device further includes a pressure detection component and a pressure regulating component. The pressure detection component is used to detect the pressure of the mixed gas, and the pressure regulating component is arranged upstream of the pressure detection component and the oxygen detection component and is used to adjust the pressure of the mixed gas.

[0007] Optionally, the pressure regulating component includes: a second regulating valve disposed on the second pipeline and upstream of the connection between the second pipeline and the first pipeline, and / or a pressure stabilizing tank, whose inlet communicates with one end of the second pipeline, and the outlet of the pressure stabilizing tank is adapted to communicate with the air inlet.

[0008] Optionally, when the pressure regulating component includes a second regulating valve, the opening degree of the first regulating valve is adjusted by the difference between the set oxygen concentration and the actual oxygen concentration, and the opening degree of the second regulating valve is adjusted by the difference between the set pressure and the actual pressure.

[0009] Optionally, when the pressure regulating component includes a second regulating valve, both the first regulating valve and the second regulating valve are automatic regulating valves, and the engine test device further includes a controller, which is electrically connected to the oxygen detection component, the pressure detection component, the first regulating valve and the second regulating valve respectively.

[0010] Optionally, the engine test device further includes a display screen connected to the controller, and the display screen is used to set the target altitude and display the current altitude corresponding to the oxygen concentration in the mixed gas and the pressure of the mixed gas.

[0011] Optionally, the engine test device further includes a cooling component for cooling the exhaust gas in the first pipeline.

[0012] Optionally, the second pipeline includes a first air inlet pipe section, the inner diameter of the first air inlet pipe section gradually decreases from one end to the other end and then gradually increases, and a connection hole penetrating the inner and outer circumferential surfaces is provided at the minimum inner diameter of the first air inlet pipe section, and the connection hole is connected to the first pipeline.

[0013] Optionally, the engine test device further includes: an air pre-filter having an air inlet and an air outlet, and the air outlet is connected to the external air inlet of the second pipeline; and / or an air filter connected between the second pipeline and the air inlet of the engine to be tested.

[0014] The present invention also provides a mechanical device for testing, including: an engine to be tested and the above-mentioned engine test device.

[0015] The technical solution of the present invention has the following advantages: The exhaust gas generated by the engine to be tested is introduced into the second pipeline through the first pipeline. The second pipeline mixes the external air with the exhaust gas generated by the engine to be tested and then sends it into the intake port of the engine to be tested. According to the oxygen concentration detected by the oxygen detection component, the first regulating valve is adjusted to regulate the amount of exhaust gas entering the second pipeline, and thus the low oxygen content at different altitudes can be simulated. The above test device uses the exhaust gas of the engine to be tested as the dilution gas for diluting the external air, reduces the intake oxygen amount of the engine to be tested, simulates the low oxygen content at different altitudes, cancels the nitrogen tank in the prior art, greatly reduces the cost, and is also convenient to arrange the engine test device on the test prototype under the whole machine test conditions, solving the problems of difficult tooling arrangement of the test device and large consumption of dilution gas in the whole machine test. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 Fig. shows a simplified schematic diagram of the engine test device provided by the present invention;

[0018] Figure 2 Fig. shows Figure 1 a cross-sectional schematic diagram of the first intake pipe section of the engine test device;

[0019] Figure 3 Fig. shows Figure 1 a schematic diagram of the control principle of the engine test device.

[0020] DESCRIPTION OF THE REFERENCE NUMERALS:

[0021] 10. Engine to be tested; 20. Second pipeline; 21. First intake pipe section; 221. Connection hole; 30. Exhaust pipe; 40. First pipeline; 51. Oxygen detection component; 52. First regulating valve; 61. Pressure detection component; 62. Second regulating valve; 63. Pressure stabilizing tank; 71. Controller; 72. Display screen; 80. Cooling component; 91. Air pre-filter; 92. Air filter; 93. Muffler. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the protection scope of the present invention.

[0023] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is 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 thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can 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.

[0025] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] As Figure 1 shown, the engine test device of this embodiment includes: a first pipeline 40, a second pipeline 20, an oxygen detection component 51, and a first regulating valve 52. The first pipeline 40 is adapted to be connected to the exhaust port of the engine 10 to be tested; one end of the second pipeline 20 forms an external air inlet, one end of the second pipeline 20 is connected to the first pipeline, and one end of the second pipeline 20 is adapted to communicate with the intake port of the engine 10 to be tested, so as to mix the external air with the exhaust gas generated by the engine 10 to be tested and send it into the intake port of the engine 10 to be tested; the oxygen detection component 51 is used to detect the oxygen concentration in the mixed gas after the external air and the exhaust gas are mixed; the first regulating valve 52 is arranged on the first pipeline 40 and adjusts the amount of exhaust gas entering the second pipeline 20 according to the oxygen concentration detected by the oxygen detection component 51. The oxygen concentration in the mixed gas is also the intake oxygen concentration of the engine 10 to be tested.

[0027] Applying the engine test device of this embodiment, the exhaust gas generated by the engine 10 to be tested is introduced into the second pipeline 20 through the first pipeline 40. The second pipeline 20 mixes the external air with the exhaust gas generated by the engine 10 to be tested and then sends it into the intake port of the engine 10 to be tested. According to the oxygen concentration detected by the oxygen detection component 51, the first regulating valve 52 is adjusted to regulate the amount of exhaust gas entering the second pipeline 20, thereby simulating low oxygen content at different altitudes. The above test device uses the exhaust gas of the engine 10 to be tested as the dilution gas for diluting the external air, reduces the intake oxygen amount of the engine 10 to be tested, simulates low oxygen content at different altitudes, cancels the nitrogen tank in the prior art, greatly reduces the cost, and is also convenient to arrange the engine test device on the test prototype under the whole machine test conditions, solving the problems of difficult tooling layout of the test device and large consumption of dilution gas in the whole machine test.

[0028] In this embodiment, the engine test device further includes a pressure detection component 61 and a pressure regulating component. The pressure detection component 61 is used to detect the pressure of the mixed gas, and the pressure regulating component is arranged upstream of the pressure detection component 61 and the oxygen detection component 51 and is used to regulate the pressure of the mixed gas. The pressure of the mixed gas is also the intake pressure of the engine 10 to be tested. The pressure regulating component can regulate the intake pressure to the set value required by the simulated environment, simulate low pressure at different altitudes, and thus improve the accuracy of the simulation test. Preferably, the pressure detection component 61 is a pressure sensor, which is convenient to use and easy to control. Of course, the pressure detection component 61 can also be a pressure gauge, etc.

[0029] In this embodiment, the pressure regulating component includes a second regulating valve 62. The second regulating valve 62 is arranged on the second pipeline 20 and upstream of the connection between the second pipeline 20 and the first pipeline 40. The pressure of the mixed gas is regulated by adjusting the opening degree of the second regulating valve 62, and the adjustment is simple.

[0030] In this embodiment, the pressure regulating component further includes a pressure stabilizing tank 63. The inlet of the pressure stabilizing tank 63 is communicated with one end of the second pipeline 20, and the outlet of the pressure stabilizing tank 63 is suitable for being communicated with the intake port. The pressure stabilizing tank 63 is used to reduce the fluctuation of the intake air flow under transient conditions and enable more stable control of the pressure and oxygen concentration. The pressure stabilizing tank 63 can adopt the structure in the prior art and will not be described in detail here.

[0031] Preferably, the oxygen detection component 51 is an oxygen sensor, which is convenient to use and easy to control. Of course, the oxygen detection component 51 can also be an oxygen concentration measuring instrument, etc.

[0032] In this embodiment, as Figure 1 shown, an oxygen sensor is provided on the pipeline connecting the outlet of the pressure stabilizing tank 63 and the intake port of the engine 10 to be tested, and the connection is simple. Of course, the oxygen sensor can also be arranged at the intake port or on the pressure stabilizing tank 63.

[0033] In this embodiment, the opening degree of the first regulating valve 52 is adjusted by the difference between the set oxygen concentration and the actual oxygen concentration. When the actual oxygen concentration detected by the oxygen detector 51 is less than the set oxygen concentration, the opening degree of the first regulating valve 52 is decreased; when the actual oxygen concentration detected by the oxygen detector 51 is greater than the set oxygen concentration, the opening degree of the first regulating valve 52 is increased, so as to adjust the oxygen concentration in the mixed gas to the oxygen concentration corresponding to the target altitude, and then a simulation test on the engine is carried out at the target altitude. When adjusting the oxygen concentration in the mixed gas, the influence on the pressure of the mixed gas is very small, so the first regulating valve 52 can be adjusted independently.

[0034] In this embodiment, the opening degree of the second regulating valve 62 is adjusted by the difference between the set pressure and the actual pressure. When the actual pressure detected by the pressure detector 61 is less than the set pressure, the opening degree of the second regulating valve 62 is increased; when the actual pressure detected by the pressure detector 61 is greater than the set pressure, the opening degree of the second regulating valve 62 is decreased, so as to adjust the pressure of the mixed gas to the pressure corresponding to the target altitude, and then a simulation test on the engine is carried out at the target altitude. When adjusting the pressure in the mixed gas, the influence on the oxygen concentration in the mixed gas is very small, so the second regulating valve 62 can be adjusted independently.

[0035] According to the control logics of the above-mentioned first regulating valve 52 and second regulating valve 62, since the two control inputs and two control outputs are in a decoupled state, considering the system characteristics, the PID control algorithm can be used to control the first regulating valve 52 and the second regulating valve 62 respectively. Among them, decoupling is a phenomenon in which two or more systems or two forms of motion are separated and processed by mathematical methods. Of course, the first regulating valve 52 and the second regulating valve 62 can also be adjusted simultaneously. The two control inputs and two control outputs are in a coupled state, and a control method with multiple control inputs and multiple control outputs is used to control the first regulating valve 52 and the second regulating valve 62. Among them, coupling refers to a phenomenon in which two or more systems or two forms of motion affect each other and even combine through mutual interaction.

[0036] In this embodiment, as Figure 3As shown, the first regulating valve 52 and the second regulating valve 62 are both automatic regulating valves. The engine test device further includes a controller 71, which is electrically connected to the oxygen detector 51, the pressure detector 61, the first regulating valve 52, and the second regulating valve 62 respectively to achieve automatic control and be more intelligent. Preferably, the automatic regulating valve is an electric control valve, which is easy to control. Specifically, the first regulating valve 52 is a first butterfly valve, and the second regulating valve 62 is a second butterfly valve. As an alternative embodiment, the automatic regulating valve is a pneumatic regulating valve or a hydraulic regulating valve, or the controller is cancelled, and both the first regulating valve 52 and the second regulating valve 62 are manual regulating valves. Under rated working conditions, the opening degrees of the manual regulating valves are adjusted so that the intake pressure and the intake oxygen concentration meet the intake conditions corresponding to the altitude.

[0037] In this embodiment, the engine test device further includes a display screen 72 connected to the controller 71. The display screen 72 is used to set the target altitude and display the current altitude corresponding to the oxygen concentration in the mixed gas and the pressure of the mixed gas. Among them, the oxygen concentration in the mixed gas is also the intake oxygen concentration of the engine 10 to be tested, and the pressure of the mixed gas is also the intake pressure of the engine 10 to be tested. The display screen 72 is used to set parameters and read the status. There is a data table stored in the controller. The data table has several altitude levels and the corresponding intake pressure and intake oxygen concentration. By checking the data table, the target values of the intake pressure and intake oxygen concentration corresponding to the target altitude can be obtained, and then the target values of the intake pressure and intake oxygen concentration are transmitted to the controller; similarly, using the method of checking the data table, the current actual intake pressure and intake oxygen concentration are converted into the current altitude and displayed on the display screen. The opening degree of the first regulating valve 52 is controlled according to the difference between the target value of the intake oxygen concentration and the actual intake oxygen concentration, and the opening degree of the second regulating valve 62 is controlled according to the difference between the target value of the intake pressure and the actual intake pressure.

[0038] In this embodiment, the display screen 72 is also used to display the actual oxygen concentration, the set oxygen concentration, the actual pressure, the set pressure, the temperature of the mixed gas, etc.

[0039] In this embodiment, as Figure 1 shown, the engine test device further includes a cooling component 80 for cooling the exhaust gas in the first pipeline 40. The cooling component 80 can reduce the influence of the exhaust gas on the boundary conditions of the intake temperature. The cooling component 80 is a radiator or the like, as long as it can play a role in reducing the temperature of the exhaust gas.

[0040] In this embodiment, as Figure 1 and Figure 2As shown in the figure, the second pipeline 20 includes a first intake pipe section 21. The inner diameter of the first intake pipe section 21 gradually decreases from one end to the other end and then gradually increases. A connection hole 221 penetrating the inner and outer circumferential surfaces is provided at the minimum inner diameter of the first intake pipe section 21, and the connection hole 221 is connected to the first pipeline 40. The second pipeline 20 is an intake pipeline. The first intake pipe section 21 adopts a Venturi structure. The gas flow velocity is the largest and the pressure is the smallest at the minimum inner diameter of the first intake pipe section 21, which can ensure that the exhaust gas can be smoothly sucked into the intake pipeline. The second pipeline 20 further includes a second intake pipe section. One end of the second intake pipe section forms an external air inlet, the other end of the second intake pipe section is connected to the second butterfly valve, one end of the first intake pipe section 21 is connected to the second butterfly valve, and the other end of the first intake pipe section 21 is connected to the pressure stabilizing tank 63.

[0041] In this embodiment, the engine test device further includes an air pre-filter 91. The air pre-filter 91 has an air inlet and an air outlet, and the air outlet is connected to the external air inlet of the second pipeline 20. The air pre-filter 91 reduces the amount of dust and impurities entering the intake system, thereby keeping the air filter clean and making the engine run more powerfully.

[0042] In this embodiment, the engine test device further includes an air filter 92. The air filter 92 is connected between the second pipeline 20 and the intake port of the engine 10 to be tested. The air filter 92 functions to filter out dust and sand particles in the air, ensuring that sufficient and clean air enters the engine. The air filter 92 is connected between the pressure stabilizing tank and the intake port of the engine 10 to be tested. Specifically, the inlet of the air filter 92 is connected to the outlet of the pressure stabilizing tank 63 through a first connecting pipeline, and the outlet of the air filter 92 is connected to the intake port of the engine 10 to be tested through a second connecting pipeline. An oxygen sensor and a pressure sensor are provided on the first connecting pipeline, and the oxygen sensor is arranged upstream of the pressure sensor.

[0043] It should be noted that an exhaust pipe 30 is connected to the exhaust gas port of the engine 10 to be tested. One end of the first pipeline 40 is connected to the exhaust pipe 30. A muffler 93 is provided on the exhaust pipe 30, and the muffler 93 functions to reduce noise. The first pipeline 40 can be connected to the exhaust pipe 30 upstream of the muffler 93 or to the exhaust pipe 30 downstream of the muffler 93. The exhaust gas is led out from the exhaust pipe 30 upstream or downstream of the muffler, and after passing through the radiator and the first butterfly valve, it is introduced into the first intake pipe section 21 between the second butterfly valve and the pressure stabilizing tank.

[0044] The present invention also provides a mechanical device for testing, such as Figure 1As shown in the figure, it includes: the engine 10 to be tested and the above-mentioned engine test device. The exhaust gas of the engine to be tested is used to simulate the intake environment at different altitudes, achieving the effect of simulating plateau tests on flat ground using the exhaust gas of the engine. Among them, the mechanical equipment used for testing is simply referred to as the test prototype.

[0045] Under the whole machine test conditions, the test device can be installed on the whole vehicle. At this time, the mechanical equipment used for testing includes the engine 10 to be tested, the second pipeline 20, the exhaust pipe 30, the air pre-filter 91, the air filter 92, the muffler 93, the controller 71, and the display screen 72, etc. When testing the engine, only the first pipeline 40, the first butterfly valve, the second butterfly valve, the pressure stabilizing tank 63, the oxygen sensor, and the pressure sensor need to be set, and the layout is simple, effectively solving the problems of difficult layout of nitrogen gas cylinders and large consumption of dilution gas in the whole machine test.

[0046] In this embodiment, the mechanical equipment used for testing is construction machinery such as cranes, rotary drilling rigs, and excavators. Of course, the mechanical equipment used for testing can also be vehicles, trains, etc.

[0047] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0048] 1. Introduce the exhaust gas of the engine to be tested into the intake pipeline. The exhaust gas is used as a dilution gas to reduce the intake oxygen content, ensuring continuous supply of inert gas, canceling the nitrogen gas cylinder, saving installation space. Under the whole machine test conditions, the test device can be installed on the whole vehicle. At this time, only the first pipeline, the first butterfly valve, the second butterfly valve, the pressure stabilizing tank, the oxygen sensor, and the pressure sensor need to be set, and the layout is simple, effectively solving the problems of difficult layout of nitrogen gas cylinders and large consumption of dilution gas in the whole machine test.

[0049] 2. The intake pipeline between the second butterfly valve and the pressure stabilizing tank adopts a Venturi structure, and the Venturi effect is used to ensure that the exhaust gas can be effectively introduced into the intake pipeline.

[0050] 3. Under transient working conditions, the oxygen sensor, the pressure sensor, and the controller are used to control the opening degrees of the two butterfly valves, and then adjust the intake pressure and the intake oxygen concentration to reach the target values, realizing the simulation of intake conditions at different altitudes.

[0051] 4. The pressure stabilizing tank is used to stabilize the pressure of the mixed gas, which can reduce the intake fluctuation and better simulate the global intake conditions on the plateau.

[0052] Obviously, the above embodiments are merely examples given for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or alterations can be made based on the above description. It is not necessary and impossible to list all implementation manners here. And the obvious changes or alterations derived therefrom still fall within the protection scope of this invention.

Claims

1. An engine test device, characterized in that, Comprising: A first pipeline, adapted to be connected to the exhaust port of the engine to be tested; A second pipeline, one end of which forms an external air inlet, one end is connected to the first pipeline, and one end is adapted to communicate with the intake port of the engine to be tested, so as to send the mixture of external air and the exhaust gas generated by the engine to be tested into the intake port of the engine to be tested; An oxygen detection component, used to detect the oxygen concentration in the mixed gas after mixing the external air and the exhaust gas; A first regulating valve, arranged on the first pipeline, and according to the oxygen concentration detected by the oxygen detection component, adjusts the amount of exhaust gas entering the second pipeline to simulate the low oxygen content at different altitudes; A cooling component, which cools the exhaust gas in the first pipeline; Wherein, the cooling component is arranged on the first pipeline and is located upstream of the first regulating valve.

2. The engine test device according to claim 1, wherein The engine test device further includes a pressure detection component and a pressure regulating component. The pressure detection component is used to detect the pressure of the mixed gas, and the pressure regulating component is arranged upstream of the pressure detection component and the oxygen detection component and is used to adjust the pressure of the mixed gas.

3. The engine test device according to claim 2, characterized in that, The pressure regulating component includes: A second regulating valve, arranged on the second pipeline and upstream of the connection between the second pipeline and the first pipeline, and / or, A pressure stabilizing tank, the inlet of which is communicated with one end of the second pipeline, and the outlet of the pressure stabilizing tank is adapted to be communicated with the intake port.

4. The engine test device according to claim 3, characterized in that, When the pressure regulating component includes a second regulating valve, the opening degree of the first regulating valve is adjusted by the difference between the set oxygen concentration and the actual oxygen concentration, and the opening degree of the second regulating valve is adjusted by the difference between the set pressure and the actual pressure.

5. The engine test device according to claim 3, characterized in that, When the pressure regulating component includes a second regulating valve, both the first regulating valve and the second regulating valve are automatic regulating valves. The engine test device further includes a controller, and the controller is electrically connected to the oxygen detection component, the pressure detection component, the first regulating valve and the second regulating valve respectively.

6. The engine test device according to claim 5, characterized in that, The engine test device further includes a display screen connected to the controller. The display screen is used to set the target altitude and display the current altitude corresponding to the oxygen concentration in the mixed gas and the pressure of the mixed gas.

7. The engine test device according to any one of claims 1 to 6, characterized in that, The second pipeline includes a first intake pipe section. The inner diameter of the first intake pipe section gradually decreases first and then gradually increases from one end to the other end. A connection hole penetrating the inner and outer circumferential surfaces is provided at the minimum inner diameter of the first intake pipe section, and the connection hole is connected to the first pipeline.

8. The engine test device according to any one of claims 1 to 6, characterized in that The engine test device further includes: An air pre-filter, having an air inlet and an air outlet, and the air outlet is connected to the external air inlet of the second pipeline; and / or, An air filter, connected between the second pipeline and the intake port of the engine to be tested.

9. A mechanical device for testing, characterized in that, Comprising: An engine to be tested and the engine test device according to any one of claims 1 to 8.

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