Engine air intake system

Abstract

The present invention discloses an engine air intake system, including an air supply mechanism, an air supply mechanism, a supercharging mechanism and a pressure stabilizing mechanism, wherein the two ends of the air supply mechanism are respectively connected to the air supply mechanism and the pressure stabilizing mechanism, and the two ends of the supercharging mechanism are respectively connected to the air supply mechanism and the pressure stabilizing mechanism; the output end of the pressure stabilizing mechanism is connected to the air intake end of the engine, the pressure stabilizing mechanism is equipped with a first pressure sensor, the first pressure sensor is connected to a controller, the controller is respectively connected to the air supply mechanism and the supercharging mechanism, the controller is used to compare the pressure setting value of the engine with the first pressure sensor, and respectively control the operation of the air supply mechanism and the supercharging mechanism to dynamically adjust the air pressure at the engine intake end. The present invention can realize dynamic adjustment of the engine intake pressure, thereby adjusting the engine intake pressure to the air pressure corresponding to the altitude required for the engine test, meeting the engine test requirements, and the engine intake system has high control accuracy and fast response speed.

Description

Technical Field

[0001] The invention belongs to the technical field of engine testing, and in particular relates to an engine air intake system. Background Art

[0002] At present, more and more engine performance tests are conducted with engine intake regulation systems, that is, controlling the intake of the engine intake system under standard conditions, including controlling the intake pressure, intake temperature and intake humidity, so that the intake pressure, intake temperature and intake humidity are under standard conditions. The role is to ensure that under standard conditions, the economy and emission performance of the engine are measured and fairly evaluated to determine whether the engine meets the standard requirements for emission performance and whether a production license can be issued. In order to strengthen supervision and encourage automobile and engine manufacturers to adopt more advanced technologies and processes to significantly reduce NO x and PM emissions, the National VI Emissions Regulations have put forward strict requirements on the road emissions of the entire vehicle. In order to ensure the smooth implementation of the National VI Emissions Regulations, various research institutions, automobile and related engine manufacturers have begun to invest more manpower, material resources, and financial resources, and adopt more advanced technologies to truly reduce the actual road emissions of vehicles. At present, there are standards for performance tests such as engine emissions, and some companies have formulated more stringent standards. The main requirement of the standard is that no matter what state the local atmospheric pressure, temperature, and humidity are in during the test, the intake pressure needs to be controlled at a fixed value or have a certain range of variation. The intake pressure has a great influence on the engine performance. Under the same conditions, the size of the engine intake pressure is proportional to the engine intake volume, so the control of pressure is particularly important.

[0003] To meet the implementation conditions of the National VI regulations, the engine's intake pressure needs to be precisely controlled. In the past, the following schemes were mainly used. One is to use a scheme to correct atmospheric conditions. This scheme does not control the intake conditions, but only corrects the test results, mainly empirical formula correction. This method cannot truly know the actual measured results under standard intake conditions, which may cause large deviations. It is an expedient solution and can only conduct general tests; the other is to conduct tests at the required altitude. This scheme involves engine transportation, personnel travel, and the guarantee of test equipment. It is greatly affected by various aspects, and it is costly and inefficient; another test method is to use a fan plus throttle valve to control the engine's intake pressure. This scheme is limited in use due to poor pressure control accuracy and long control time. Summary of the invention

[0004] In order to meet the implementation conditions of the National VI regulations and respond to the National VII emission standards, the purpose of the present invention is to provide an engine intake system that dynamically adjusts the engine's intake pressure, with a fast response speed and high control accuracy.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an engine air intake system, comprising an air supply mechanism, an air supply mechanism, a supercharging mechanism and a pressure stabilizing mechanism, wherein the two ends of the air supply mechanism are respectively connected to the air supply mechanism and the pressure stabilizing mechanism, and the two ends of the supercharging mechanism are respectively connected to the air supply mechanism and the pressure stabilizing mechanism; the output end of the pressure stabilizing mechanism is connected to the air intake end of the engine, the pressure stabilizing mechanism is equipped with a first pressure sensor, the first pressure sensor is connected to a controller, the controller is respectively connected to the air supply mechanism and the supercharging mechanism, the controller is used to compare the pressure setting value of the engine with the first pressure sensor, and respectively control the operation of the air supply mechanism and the supercharging mechanism to dynamically adjust the air pressure at the engine intake end.

[0006] As an optional solution of the present invention, a second pressure sensor is provided at the output end of the air supply mechanism, and the second pressure sensor is connected to the controller. The controller compares the pressure setting value of the engine with the first pressure sensor based on the pressure value of the second pressure sensor. When the pressure setting value is greater than the pressure value of the first pressure sensor, the controller controls the boost mechanism to start and the air supply mechanism to shut down; when the pressure setting value is less than the pressure value of the first pressure sensor, the controller controls the air supply mechanism to start and the boost mechanism to shut down.

[0007] As an optional solution of the present invention, the air supply mechanism dynamically adjusts the air pressure at its output end according to the pressure setting value of the engine, so that the pressure value of the second pressure sensor is 2Kpa-4Kpa higher than the pressure setting value of the engine.

[0008] As an optional solution of the present invention, the pressure stabilizing mechanism includes a pressure stabilizing box, the input end of the pressure stabilizing box is respectively connected to the boosting mechanism and the air supply mechanism, the output end of the pressure stabilizing box is provided with an air supply pipe, and the air supply pipe is connected to the air intake end of the engine; the air supply mechanism is connected to the pressure stabilizing box.

[0009] As an optional solution of the present invention, the first pressure sensor is arranged on the gas pipeline, and a flow meter and a first regulating valve are also arranged on the gas pipeline, and the flow meter and the first regulating valve are both connected to the controller; the first regulating valve is a Venturi valve; a third pressure sensor and a first temperature and humidity sensor are arranged in the pressure stabilizing box, and the third pressure sensor and the first temperature and humidity sensor are both connected to the controller;

[0010] As an optional scheme of the present invention, the pressure stabilizing mechanism also includes a pressure stabilizing tank, which is connected with the boosting mechanism and the air supply mechanism respectively, and a pressure stabilizing pipeline is connected between the pressure stabilizing tank and the pressure stabilizing box, and a second regulating valve is arranged on the pressure stabilizing pipeline; a third regulating valve is arranged on the input end of the pressure stabilizing box; a fourth pressure sensor and a second temperature and humidity sensor are arranged in the pressure stabilizing tank, and the pressure stabilizing tank is provided with a pressure relief valve, and the pressure stabilizing tank is connected with a pressure relief pipeline, and the end of the pressure relief pipeline is connected with the input end of the air supply mechanism, and a negative pressure machine and a fourth regulating valve are arranged on the pressure relief pipeline, and the negative pressure machine and the fourth regulating valve are both connected to the controller; when the air pressure in the pressure stabilizing tank is higher than the pressure setting value of the engine by 2Kpa-4Kpa, the controller controls the fourth regulating valve to open for pressure relief; when the air pressure in the pressure stabilizing tank is higher than the pressure setting value of the engine by 4Kpa, the controller controls the fourth regulating valve and the negative pressure machine to open for pressure relief; a pressure buffer is arranged in the pressure stabilizing tank, and the pressure stabilizing tank is provided with a sound absorbing material layer.

[0011] As an optional solution of the present invention, the air supply mechanism includes an air-conditioning unit, which is used to output air that meets the engine test temperature, humidity and air pressure. An air supply pipeline is provided at the output end of the air-conditioning unit, and one end of the air supply pipeline is respectively connected to the pressure stabilizing box and the pressure stabilizing tank.

[0012] As an optional solution of the present invention, the boosting mechanism includes a boosting pipeline, one end of the boosting pipeline is connected to the output end of the air-conditioning unit, and the other end of the boosting pipeline is connected to the air supply pipeline. A booster and a fifth regulating valve are provided on the boosting pipeline, and the booster and the fifth regulating valve are both connected to the controller.

[0013] As an optional solution of the present invention, the air supply mechanism includes an air supply pipeline, one end of which is connected to the output end of the air conditioning unit, and the other end of which is connected to the air supply pipeline. The air supply pipeline is provided with an air blower and a sixth regulating valve, and both the air blower and the sixth regulating valve are connected to the controller. When the pressure setting value of the engine is greater than the pressure value of the first pressure sensor, the controller controls the supercharger and the fifth regulating valve to open, and controls the air blower and the sixth regulating valve to close; when the pressure setting value of the engine is less than the pressure value of the first pressure sensor, the controller controls the air blower and the sixth regulating valve to open, and controls the supercharger and the fifth regulating valve to close.

[0014] As an optional solution of the present invention, the exhaust end of the engine is provided with an output pipe, the output pipe is provided with a fifth pressure sensor and a seventh regulating valve, the fifth pressure sensor is connected to the controller, the end of the output pipe is provided with a cooler and an exhaust tank, the exhaust tank is provided with an exhaust pipeline, and the exhaust pipeline is provided with an exhaust fan.

[0015] The beneficial effects of the present invention are:

[0016] The present invention provides an engine air intake system, which compares the pressure setting value of the engine with the first pressure sensor through a controller, and controls the operation of the air supply mechanism and the supercharging mechanism respectively, thereby dynamically adjusting the air pressure at the engine intake end. The engine air intake system of the present invention can simulate the engine to perform a pressure test, create a standard intake pressure condition, and realize dynamic adjustment of the engine intake pressure, thereby adjusting the engine intake pressure to the air pressure corresponding to the altitude required for the engine test, meeting the engine test requirements, and the engine intake system has high control accuracy and fast response speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a specific embodiment of the present invention;

[0018] Figure 2 is a diagram of pressure changes during the test process of a specific embodiment of the present invention;

[0019] Figure 3 It is a temperature, humidity and pressure change diagram during the test process of a specific embodiment of the present invention;

[0020] In the figure: 1-engine; 2-first pressure sensor; 3-pressure stabilizing box; 4-gas pipeline; 5-flow meter; 6-first regulating valve; 7-pressure stabilizing tank; 8-pressure stabilizing pipeline; 9-second regulating valve; 10-third regulating valve; 11-pressure relief valve; 12-pressure relief pipeline; 13-negative pressure machine; 14-fourth regulating valve; 15-air conditioning unit; 16-air supply pipeline; 17-boosting pipeline; 18-boosting machine; 19-fifth regulating valve; 20-air supply pipeline; 21-air supply fan; 22-sixth regulating valve; 23-output pipe; 24-fifth pressure sensor; 25-seventh regulating valve; 26-exhaust tank; 27-exhaust pipeline; 28-exhaust fan; 29-pressure buffer; 30-sound-absorbing material layer. DETAILED DESCRIPTION

[0021] Example

[0022] like Figure 1 As shown, in order to meet the implementation conditions of the National VI regulations and respond to the National VII emission standards, this embodiment provides an engine intake system, which is used to provide the air simulation conditions required for automatic measurement / control of the engine bench test, and has temperature control, humidity control and pressure control functions. The temperature, humidity and pressure parameters of the air can be set according to the test requirements to facilitate the research and development of the engine 1 product, which is particularly reflected in the dynamic responsiveness of the pressure control.

[0023] The air intake system includes an air supply mechanism, an air delivery mechanism, a supercharging mechanism and a pressure stabilizing mechanism. The two ends of the air supply mechanism are respectively connected to the air supply mechanism and the pressure stabilizing mechanism, the two ends of the supercharging mechanism are respectively connected to the air supply mechanism and the pressure stabilizing mechanism, and the output end of the pressure stabilizing mechanism is connected to the air intake end of the engine 1. The air supply mechanism can output air with a certain temperature, humidity and pressure, and the pressure stabilizing mechanism keeps the air at a stable temperature, humidity and pressure, which is directly delivered to the engine 1 for testing. When supercharging is required, the supercharging mechanism operates to supercharge the air and delivers the supercharged air to the pressure stabilizing mechanism; when pressure reduction is required, the supercharging mechanism stops running, and the air supply mechanism delivers low-pressure air to reduce the pressure of the air in the pressure stabilizing mechanism.

[0024] The pressure stabilizing mechanism is equipped with a first pressure sensor 2, and the first pressure sensor 2 is connected to a controller, and the controller is respectively connected to the air supply mechanism and the supercharging mechanism. The first pressure sensor 2 is arranged at the output end of the pressure stabilizing mechanism, which can be arranged at the position of the output port of the pressure stabilizing mechanism, or at a position close to the engine 1, and is used to detect the pressure at the output end of the pressure stabilizing mechanism, so that the air output by the pressure stabilizing mechanism can meet the pressure test requirements of the engine 1. During the test, the controller compares the pressure setting value of the engine 1 with the first pressure sensor 2, and controls the operation of the air supply mechanism and the supercharging mechanism respectively to dynamically adjust the air pressure at the intake end of the engine 1. When the pressure setting value of the engine 1 is greater than the pressure value of the first pressure sensor 2, the controller controls the supercharging mechanism to start and the air supply mechanism to close; when the pressure setting value is less than the pressure value of the first pressure sensor 2, the controller controls the air supply mechanism to start and the supercharging mechanism to close, so as to achieve dynamic pressure regulation, thereby meeting the test requirements of the engine 1. The engine intake system of the present invention can simulate the pressure test of the engine 1, create standard intake pressure conditions, and realize dynamic adjustment of the intake pressure of the engine 1, thereby adjusting the intake pressure of the engine 1 to the air pressure corresponding to the altitude required for the engine 1 test, thereby meeting the test requirements of the engine 1, and the engine intake system has high control accuracy and fast response speed.

[0025] In some embodiments, the output end of the air supply mechanism is provided with a second pressure sensor, and the second pressure sensor is connected to the controller. The controller compares the pressure setting value of the engine 1 with the first pressure sensor 2 based on the pressure value of the second pressure sensor. When the pressure setting value is greater than the pressure value of the first pressure sensor 2, the controller controls the supercharging mechanism to start and the air supply mechanism to close; when the pressure setting value is less than the pressure value of the first pressure sensor 2, the controller controls the air supply mechanism to start and the supercharging mechanism to close. When the air supply mechanism is not started, due to pressure loss, leakage, gas compression characteristics and other pressure losses, the pressure value of the second pressure sensor is the sum of the pressure value of the first pressure sensor 2 and the pressure loss value. According to the pressure value detected by the second pressure sensor, the controller can quickly dynamically adjust the air supply mechanism and the supercharging mechanism, thereby greatly shortening the time required for pressure regulation of the engine 1.

[0026] Preferably, the air supply mechanism dynamically adjusts the air pressure at its output end according to the pressure setting value of the engine 1, so that the pressure value of the second pressure sensor is 2Kpa-4Kpa higher than the pressure setting value of the engine 1. According to experimental tests, the pressure loss value of the intake system is 2Kpa-4Kpa. When the engine 1 is tested, the air pressure at the output end of the air supply mechanism is first adjusted to reach a suitable range, and then the air supply mechanism and the supercharging mechanism are dynamically adjusted to shorten the pressure adjustment time of the engine 1 and improve the adjustment accuracy.

[0027] In some embodiments, the pressure stabilizing mechanism includes a pressure stabilizing box 3, the input end of the pressure stabilizing box 3 is connected to the supercharging mechanism and the air supply mechanism respectively, and the output end of the pressure stabilizing box 3 is provided with a gas pipe 4, and the gas pipe 4 is connected to the intake end of the engine 1. The first pressure sensor 2 is arranged on the gas pipe 4, and the gas pipe 4 is also provided with a flow meter 5 and a first regulating valve 6, and the flow meter 5 and the first regulating valve 6 are both connected to the controller; preferably, the first regulating valve 6 is a Venturi valve, and the opening of the Venturi valve is adjusted to meet the response of the gas delivery flow rate. The pressure stabilizing box 3 is provided with a third pressure sensor and a first temperature and humidity sensor, and the third pressure sensor and the first temperature and humidity sensor are both connected to the controller.

[0028] In some embodiments, the pressure stabilizing mechanism also includes a pressure stabilizing tank 7, which is connected to the boosting mechanism and the air supply mechanism respectively. A pressure stabilizing pipeline 8 is connected between the pressure stabilizing tank 7 and the pressure stabilizing box 3. A second regulating valve 9 is provided on the pressure stabilizing pipeline 8. The second regulating valve 9 is a pneumatic switching butterfly valve, which is used to control the air intake switch between the pressure stabilizing tank 7 and the pressure stabilizing box 3; a third regulating valve 10 is provided at the input end of the pressure stabilizing box 3, and the third regulating valve 10 is a manual switching valve, which is used to control the air intake switch of the pressure stabilizing box 3.

[0029] The pressure regulating tank 7 is provided with a fourth pressure sensor and a second temperature and humidity sensor, and the pressure regulating tank 7 is provided with a pressure relief valve 11. The pressure regulating tank 7 is connected with a pressure relief pipeline 12. The end of the pressure relief pipeline 12 is connected to the input end of the air supply mechanism. The pressure relief pipeline 12 is provided with a negative pressure machine 13 and a fourth regulating valve 14. The negative pressure machine 13 and the fourth regulating valve 14 are both connected to the controller. The pressure relief valve 11 is a safety pressure relief valve, which is usually set to a maximum of 130Kpa to protect the upper limit of the pressure in the pressure regulating tank 7. A self-operated pressure regulating valve with a pressure relief function can be considered. The pressure relief pipeline 12 can be made of PVC round pipes or bellows. The end of the pressure relief pipeline 12 uses a large bellows. The large bellows are set at the front end of the air supply mechanism such as the whole machine fresh air filter to provide fresh air. Different working conditions of the engine 1, working conditions under emergency shutdown, overshoot during the fan frequency adjustment process, etc. may cause pressure to increase. Considering the pressure relief logic, the higher altitude of the plateau is simulated, and there are conditions lower than the local atmospheric pressure. The system pressure relief mainly relies on the negative pressure machine 13 and the fourth regulating valve 14 installed on the pressure stabilizing tank 7, and its reference is the fourth pressure sensor installed in the pressure stabilizing tank 7. When the air pressure in the pressure stabilizing tank 7 is higher than the pressure setting value of the engine 1 by 2Kpa-4Kpa, the controller controls the fourth regulating valve 14 to open for pressure relief; when the air pressure in the pressure stabilizing tank 7 is higher than the pressure setting value of the engine 1 by 4Kpa, the controller controls the fourth regulating valve 14 and the negative pressure machine 13 to open for pressure relief.

[0030] The pressure stabilizing tank 7 is provided with a pressure buffer 29, which can balance the pressure fluctuation of the pressure stabilizing tank 7 and adjust the pressure range of the pressure stabilizing tank 7, thereby improving the intake pressure accuracy of the pressure stabilizing box 3. The pressure stabilizing tank 7 is provided with a sound absorbing material layer 30, and the sound absorbing material layer 30 can be made of sound absorbing cotton or a sound insulation board. Preferably, the sound absorbing material layer 30 is a combination of sound absorbing cotton and a sound insulation board. By arranging sound absorbing cotton and a sound insulation board on the outside of the pressure stabilizing tank 7, the sound absorbing cotton is used to absorb the noise generated during the operation of the pressure stabilizing tank 7, reducing the transmission of noise to the outside, and then the sound insulation board isolates the noise, further improving the sound insulation effect of the sound absorbing material layer 30, reducing the impact of noise, and improving the quiet performance of the pressure stabilizing tank 7.

[0031] In some embodiments, the air supply mechanism includes an air conditioning unit 15, the air conditioning unit 15 is used to output air that meets the test temperature, humidity and air pressure of the engine 1, and the output end of the air conditioning unit 15 is provided with an air supply pipeline 16, one end of which is respectively connected to the pressure stabilizing tank 3 and the pressure stabilizing tank 7. The boosting mechanism includes a boosting pipeline 17, one end of which is connected to the output end of the air conditioning unit 15, and the other end of which is connected to the air supply pipeline 16. The boosting pipeline 17 is provided with a supercharger 18 and a fifth regulating valve 19, and the supercharger 18 and the fifth regulating valve 19 are both connected to the controller.

[0032] The air supply mechanism includes an air supply pipeline 20, one end of which is connected to the output end of the air conditioning unit 15, and the other end of which is connected to the air supply pipeline 16. The air supply pipeline 20 is provided with an air blower 21 and a sixth regulating valve 22, and both the air blower 21 and the sixth regulating valve 22 are connected to the controller. The maximum air volume of the air blower 21 = the maximum required air volume of the engine 1 + the maximum leakage air volume of the negative pressure machine 13. The first regulating valve, the fourth regulating valve 14, and the fifth regulating valve 19 are all servo butterfly valves to improve the response accuracy. When the pressure setting value of the engine 1 is greater than the pressure value of the first pressure sensor 2, the controller controls the supercharger 18 and the fifth regulating valve 19 to open, and controls the air blower 21 and the sixth regulating valve 22 to close; when the pressure setting value of the engine 1 is less than the pressure value of the first pressure sensor 2, the controller controls the air blower 21 and the sixth regulating valve 22 to open, and controls the supercharger 18 and the fifth regulating valve 19 to close.

[0033] In some embodiments, the exhaust end of the engine 1 is provided with an output pipe 23, on which a fifth pressure sensor 24 and a seventh regulating valve 25 are provided, the fifth pressure sensor 24 is connected to the controller, and a cooler and an exhaust tank 26 are provided at the end of the output pipe 23, the exhaust tank 26 is provided with an exhaust pipeline 27, and the exhaust pipeline 27 is provided with an exhaust fan 28 to adapt to the formation of negative pressure at high altitudes.

[0034] When testing engine 1, every 5% change in humidity affects the NOx emission measurement result by about 2%; every 1mBar change in pressure affects the torque measurement result by about 0.12%; every 1K change in temperature affects the power and fuel consumption measurement results by about 0.5%. The engine intake system of the present invention was tested under the following test conditions: an altitude of 2000m, a speed change within 1000rpm-4500rpm for 10s, and a throttle change within 25%-100% for 1s. Figure 2 and Figure 3 As shown, the specific results show that the temperature fluctuation is + / -1°C, which is much less than 1S; the humidity fluctuation is + / -3%RH, which is much less than 1S; the pressure fluctuation is + / -1mBar, which is less than 1S. The engine intake system of the present invention has high control accuracy and fast response speed, and can meet the control requirements of the intake pressure of the engine 1.

[0035] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. The term "multiple" means more than two, unless otherwise clearly and specifically defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, and can be fixedly connected, detachably connected, or integrated; can be mechanically connected or electrically connected; can be directly connected or indirectly connected through an intermediate medium, can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood. In addition, the specific features, structures, materials or characteristics described in the embodiment are included in at least one embodiment. Those skilled in the art can combine the features of different embodiments without contradiction.

Claims

1. An engine air intake system, characterized in that: The invention comprises an air supply mechanism, an air supply mechanism, a supercharging mechanism and a pressure stabilizing mechanism, wherein the two ends of the air supply mechanism are respectively connected to the air supply mechanism and the pressure stabilizing mechanism, and the two ends of the supercharging mechanism are respectively connected to the air supply mechanism and the pressure stabilizing mechanism; the output end of the pressure stabilizing mechanism is connected to the air intake end of the engine (1); the pressure stabilizing mechanism is provided with a first pressure sensor (2); the first pressure sensor (2) is connected to a controller; the controller is respectively connected to the air supply mechanism and the supercharging mechanism; the controller is used to compare the pressure setting value of the engine (1) with the first pressure sensor (2), and respectively control the operation of the air supply mechanism and the supercharging mechanism to dynamically adjust the air pressure at the air intake end of the engine (1); The output end of the air supply mechanism is provided with a second pressure sensor, the second pressure sensor is connected to the controller, the controller compares the pressure setting value of the engine (1) with the first pressure sensor (2) based on the pressure value of the second pressure sensor, when the pressure setting value is greater than the pressure value of the first pressure sensor (2), the controller controls the boost mechanism to start and the air supply mechanism to shut down; when the pressure setting value of the engine (1) is less than the pressure value of the first pressure sensor (2), the controller controls the air supply mechanism to start and the boost mechanism to shut down; The pressure stabilizing mechanism comprises a pressure stabilizing box (3), the input end of the pressure stabilizing box (3) is respectively connected to the supercharging mechanism and the air supply mechanism, the output end of the pressure stabilizing box (3) is provided with an air supply pipe (4), the air supply pipe (4) is connected to the air intake end of the engine (1); the air supply mechanism is connected to the pressure stabilizing box (3); The first pressure sensor (2) is arranged on the gas transmission pipe (4), and a flow meter (5) and a first regulating valve (6) are also arranged on the gas transmission pipe (4), and the flow meter (5) and the first regulating valve (6) are both connected to the controller; the first regulating valve (6) is a Venturi valve; a third pressure sensor and a first temperature and humidity sensor are arranged in the pressure stabilizing box (3), and the third pressure sensor and the first temperature and humidity sensor are both connected to the controller; The pressure stabilizing mechanism further comprises a pressure stabilizing tank (7), the pressure stabilizing tank (7) being connected to the pressure boosting mechanism and the air supply mechanism respectively, a pressure stabilizing pipeline (8) being connected between the pressure stabilizing tank (7) and the pressure stabilizing box (3), the pressure stabilizing pipeline (8) being provided with a second regulating valve (9); a third regulating valve (10) being provided at the input end of the pressure stabilizing box (3); a fourth pressure sensor and a second temperature and humidity sensor being provided in the pressure stabilizing tank (7), the pressure stabilizing tank (7) being provided with a pressure relief valve (11), the pressure stabilizing tank (7) being connected to a pressure relief pipeline (12), the end of the pressure relief pipeline (12) being connected to the input end of the air supply mechanism, the pressure relief pipeline (12) A negative pressure machine (13) and a fourth regulating valve (14) are provided on the pressure regulating tank (7), and the negative pressure machine (13) and the fourth regulating valve (14) are both connected to the controller; when the air pressure in the pressure regulating tank (7) is higher than the pressure setting value of the engine (1) by 2Kpa-4Kpa, the controller controls the fourth regulating valve (14) to open for pressure relief; when the air pressure in the pressure regulating tank (7) is higher than the pressure setting value of the engine (1) by 4Kpa, the controller controls the fourth regulating valve (14) and the negative pressure machine (13) to open for pressure relief; a pressure buffer (29) is provided in the pressure regulating tank (7), and the pressure regulating tank (7) is provided with a sound absorbing material layer (30).

2. The engine intake system according to claim 1, characterized in that: The air supply mechanism dynamically adjusts the air pressure at its output end according to the pressure setting value of the engine (1), so that the pressure value of the second pressure sensor is 2Kpa-4Kpa higher than the pressure setting value of the engine (1).

3. The engine intake system according to claim 1, characterized in that: The air supply mechanism comprises an air conditioning unit (15), the air conditioning unit (15) being used to output air that meets the test temperature, humidity and air pressure of the engine (1), an air supply pipeline (16) being provided at the output end of the air conditioning unit (15), one end of the air supply pipeline (16) being respectively connected to the pressure stabilizing box (3) and the pressure stabilizing tank (7).

4. The engine air intake system according to claim 3, characterized in that: The boost mechanism comprises a boost pipeline (17), one end of the boost pipeline (17) is connected to the output end of the air conditioning unit (15), and the other end of the boost pipeline (17) is connected to the air supply pipeline (16). A booster (18) and a fifth regulating valve (19) are provided on the boost pipeline (17), and the booster (18) and the fifth regulating valve (19) are both connected to the controller.

5. The engine air intake system according to claim 4, characterized in that: The air supply mechanism comprises an air supply pipeline (20), one end of which is connected to the output end of the air conditioning unit (15), and the other end of which is connected to the air supply pipeline (16). The air supply pipeline (20) is provided with an air blower (21) and a sixth regulating valve (22), and both the air blower (21) and the sixth regulating valve (22) are connected to the controller. When the pressure setting value of the engine (1) is greater than the pressure value of the first pressure sensor (2), the controller controls the supercharger (18) and the fifth regulating valve (19) to open, and controls the air blower (21) and the sixth regulating valve (22) to close. When the pressure setting value of the engine (1) is less than the pressure value of the first pressure sensor (2), the controller controls the air blower (21) and the sixth regulating valve (22) to open, and controls the supercharger (18) and the fifth regulating valve (19) to close.

6. The engine air intake system according to claim 1, characterized in that: An output pipe (23) is provided at the exhaust end of the engine (1), a fifth pressure sensor (24) and a seventh regulating valve (25) are provided on the output pipe (23), the fifth pressure sensor (24) is connected to the controller, a cooler and an exhaust tank (26) are provided at the end of the output pipe (23), the exhaust tank (26) is provided with an exhaust pipeline (27), and an exhaust fan (28) is provided on the exhaust pipeline (27).

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