An engine intake simulation system

Abstract

The present invention discloses an engine intake simulation system, including a controller, an air conditioning unit, a primary temperature control device, an air compressor, a humidifier and a secondary temperature control device, wherein the output end of the secondary temperature control device is connected to the intake end of the engine; the controller is used to control the operating states of the air conditioning unit, the primary temperature control device, the air compressor, the humidifier and the secondary temperature control device respectively, thereby dynamically adjusting the temperature, humidity and pressure of the gas output by the secondary temperature control device. The air conditioning unit of the present invention can provide gas with a certain temperature, humidity and pressure, the primary temperature control device can preliminarily adjust the temperature of the gas, the air compressor can adjust the pressure of the gas, the humidifier can adjust the humidity of the gas, and the secondary temperature control device can further adjust the temperature of the gas to obtain gas with the temperature, humidity and pressure required by the engine, thereby meeting the intake simulation requirements of the engine, and the engine intake simulation system has high control accuracy and fast response speed.

Description

Technical Field

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

[0002] At present, more and more engine intake simulation systems are used in engine performance tests, that is, the engine intake system is controlled to intake air 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 NOx and PM emissions, the National VI Emission Regulations have put forward strict requirements for vehicle road emissions. In order to ensure the smooth implementation of the National VI Emission 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 engine emission and other performance tests, and some companies have formulated more stringent standards. The main requirement of the standard is that no matter what the local atmospheric pressure, temperature and humidity are in, the intake pressure, intake temperature and intake humidity need to be controlled within a fixed value or a certain range of variation.

[0003] The engine intake simulation system currently used in China mainly adopts a solution of fan plus throttle valve to control the engine intake. This solution has poor control accuracy and long control time, which affects the engine performance test. Summary of the invention

[0004] The purpose of the present invention is to provide an engine intake simulation system to solve the above problems existing in the prior art.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an engine intake simulation system, comprising a controller, an air-conditioning unit, a primary temperature control device, an air compressor, a humidifying device and a secondary temperature control device, wherein the air-conditioning unit, the primary temperature control device, the air compressor, the humidifying device and the secondary temperature control device are connected in sequence, and the output end of the secondary temperature control device is connected to the intake end of the engine; the controller is respectively connected to the air-conditioning unit, the primary temperature control device, the air compressor, the humidifying device and the secondary temperature control device, and the controller is used to respectively control the operating states of the air-conditioning unit, the primary temperature control device, the air compressor, the humidifying device and the secondary temperature control device, thereby dynamically adjusting the gas temperature, humidity and pressure output by the secondary temperature control device.

[0006] As an optional solution of the present invention, the controller is connected to a first detection unit, which is used to detect the gas temperature, humidity and pressure at the intake end of the engine. The controller dynamically adjusts the gas temperature, humidity and pressure output by the secondary temperature control device based on the preset intake factor of the engine and the detection data of the first detection unit.

[0007] As an optional solution of the present invention, the output end of the secondary temperature control device is provided with a second detection unit, the second detection unit is used to detect the gas temperature, humidity and pressure at the output end of the secondary temperature control device, and the second detection unit is connected to the controller.

[0008] As an optional solution of the present invention, a connecting pipe is provided between the output end of the secondary temperature control device and the intake end of the engine, and an intermediate pressure sensor is provided on the connecting pipe. The intermediate pressure sensor is connected to a controller. The controller obtains the corresponding relationship between the pressure value at the output end of the secondary temperature control device and the pressure value at the intake end of the engine by calculating the pressure loss of the connecting pipe based on the detection data of the first detection unit, the second detection unit and the intermediate pressure sensor, and dynamically adjusts the gas temperature, humidity and pressure output by the secondary temperature control device (5).

[0009] As an optional scheme of the present invention, the air-conditioning unit is provided with a mixing section, which is sequentially connected to a filtering section, a primary temperature control section, an air supply section, a humidification section and a secondary temperature control section, the primary temperature control section is provided with a primary temperature control device, the air supply section is provided with an air compression device, the humidification section is provided with a humidification device, and the secondary temperature control section is provided with a secondary temperature control device.

[0010] As an optional solution of the present invention, the primary temperature control device includes a primary surface cooler and a primary heater, both of which are arranged in the primary temperature control section, and the primary surface cooler is equipped with a refrigeration unit.

[0011] As an optional solution of the present invention, the secondary temperature control device includes a primary exchanger and a secondary exchanger, the secondary exchanger is arranged in the secondary temperature control section, a secondary circulating water pipe is provided between the secondary exchanger and the primary exchanger, a secondary heater is provided on the secondary circulating water pipe, and the primary exchanger is connected to the primary circulating water pipe.

[0012] As an optional solution of the present invention, the secondary circulating water pipe includes a secondary water inlet pipe and a secondary water outlet pipe, the two ends of the secondary water inlet pipe are respectively connected to the output end of the primary exchanger and the input end of the secondary exchanger, the two ends of the secondary water outlet pipe are respectively connected to the input end of the primary exchanger and the output end of the secondary exchanger, an intermediate water pipe is connected between the secondary water inlet pipe and the secondary water outlet pipe, the intermediate water pipe is provided with a secondary heater, the secondary water inlet pipe is provided with a circulating water pump and a three-way proportional valve, and one end of the intermediate water pipe is connected to the three-way proportional valve.

[0013] As an optional solution of the present invention, the secondary water outlet pipe is provided with an expansion water tank, a first temperature sensor and a first pressure sensor, and the secondary water inlet pipe is provided with a second temperature sensor and a second pressure sensor.

[0014] As an optional solution of the present invention, the primary circulating water pipe includes a primary water inlet pipe and a primary water outlet pipe, both of which are connected to the primary exchanger, and a water filter is provided on the primary water inlet pipe.

[0015] As an optional solution of the present invention, the mixing section is provided with a fresh air fan, and the filtering section is provided with an air filter.

[0016] The beneficial effects of the present invention are:

[0017] The present invention provides an engine air intake simulation system. An air conditioning unit can provide gas with a certain temperature, humidity and pressure. A primary temperature control device can preliminarily adjust the temperature of the gas. An air compressor can adjust the pressure of the gas. A humidifier can adjust the humidity of the gas. A secondary temperature control device can further adjust the temperature of the gas to obtain gas with the temperature, humidity and pressure required by the engine, thereby meeting the engine's air intake simulation requirements. In addition, the engine air intake simulation system has high control accuracy and fast response speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an implementation mode of the present invention;

[0019] Figure 2 is a control block diagram of an embodiment of the present invention;

[0020] Figure 3 is a schematic structural diagram of a secondary temperature control device in one embodiment of the present invention;

[0021] Figure 4 It is a schematic structural diagram of a humidifying device in one embodiment of the present invention.

[0022] In the figure: 1-controller; 2-air conditioning unit; 3-air compressor; 4-humidifier; 5-secondary temperature control device; 6-first detection unit; 7-second detection unit; 8-connecting pipe; 9-intermediate pressure sensor; 10-first-stage cooler; 11-first-stage heater; 12-first-stage exchanger; 13-secondary exchanger; 14-secondary heater; 15-secondary water inlet pipe; 16-secondary water outlet pipe; 17-intermediate water pipe; 18-circulating water pump; 19-three-way proportional valve; 20-expansion water tank; 21-first-stage water inlet pipe; 22-first-stage water outlet pipe; 23-water filter; 24-third detection unit; 25-fourth detection unit. DETAILED DESCRIPTION

[0023] Example

[0024] like Figure 1-Figure 4 As shown, this embodiment provides an engine intake simulation system, which is suitable for vehicle or non-road engine emission tests and performance tests, and the test fuels include liquid fuels such as diesel and gasoline, and alternative fuels. The system mainly includes a controller 1, an air conditioning unit 2, a primary temperature control device, an air compressor 3, a humidifier 4, and a secondary temperature control device 5. The air conditioning unit 2, the primary temperature control device, the air compressor 3, the humidifier 4, and the secondary temperature control device 5 are connected in sequence, and the output end of the secondary temperature control device 5 is connected to the intake end of the engine. The output end of the secondary temperature control device 5 can be connected to several engines, which can meet the intake volume during the time-sharing test of engines in two different power sections, and can be used for type certification, development and calibration tests of full-flow dilution sampling and analysis methods. The flow rate of the system should at least meet 4000m at 25°C. 3 / h of air intake requirement, the system may be equipped with a pressure stabilizing device with sufficient volume and a pressure relief protection valve.

[0025] The controller 1 is connected to the air conditioning unit 2, the primary temperature control device, the air compressor 3, the humidifier 4 and the secondary temperature control device 5 respectively, and the controller 1 is used to control the operating states of the air conditioning unit 2, the primary temperature control device, the air compressor 3, the humidifier 4 and the secondary temperature control device 5 respectively, so as to dynamically adjust the temperature, humidity and pressure of the gas output by the secondary temperature control device 5. The air conditioning unit 2 can provide gas with a certain temperature, humidity and pressure, the primary temperature control device can preliminarily adjust the temperature of the gas, the air compressor 3 can adjust the pressure of the gas, the humidifier 4 can adjust the humidity of the gas, and the secondary temperature control device 5 can further adjust the temperature of the gas to obtain the gas with the temperature, humidity and pressure required by the engine, so as to meet the intake simulation requirements of the engine.

[0026] Among them, controller 1 adopts Siemens SIMATIC S7-200SMART products, which includes an electrical control cabinet, which is installed near the air-conditioning unit 2. Controller 1 also includes two HMI touch screens, which are installed in a 19-inch measurement and control cabinet in the control room of the test room.

[0027] The technical parameters of controller 1 are:

[0028] Electrical control cabinet: double-door, size (length x width x height) (mm) is about 1200*400*1700;

[0029] Control unit configuration: 1 Siemens SIMATICS7-200SMART CPU, CAN, RAW interface conversion card, several AO, AI, DI, DO and PT signal expansion modules;

[0030] The necessary electrical components of controller 1 adopt internationally renowned brands such as Siemens, Schneider and ABB;

[0031] Controller 1 should have two control modes: local and remote. The remote and local modes can be switched through the touch screen. Specifically:

[0032] Local mode: refers to manually executing all control functions through the control panel embedded in the 19-inch measurement and control cabinet of the engine dynamometer test system, including at least but not limited to the setting and monitoring of intake factor parameters, equipment start and stop and operation status monitoring, setting of alarm limits, alarm and identification of equipment failures, etc.

[0033] Remote mode: refers to the control function of the engine dynamometer test system's main control system through internationally accepted communication protocols and interfaces, including at least but not limited to the setting and monitoring of intake factor parameters, equipment start-stop and operating status monitoring, setting of alarm limits and transmission of alarm signals, real-time reading of engine intake volume, etc.

[0034] Controller 1 should ensure that the engine connected to it can still have sufficient air intake when it stops due to failure or erroneous operation;

[0035] The controller 1 is provided with a corresponding interface to receive external emergency stop signals, such as engine dynamometer test system, fire alarm system, etc., and can shut down the engine in time and cut off the engine air intake in an emergency. The necessary air intake emergency cut-off device should also be provided;

[0036] Controller 1 has corresponding protection and error display functions, such as overpressure, underpressure, overtemperature, etc.;

[0037] The controller 1 has a detailed operating principle diagram, which can display the air temperature, humidity and pressure of each node, including but not limited to the three positions after the system air is filtered, dehumidified and humidified.

[0038] The air compressor 3 uses a compressor, which pressurizes the gas so that the gas enters the engine at a preset pressure for testing. The humidifier 4 uses the original European imported brand CondAir, which is used to humidify the air. The humidifier 4 can effectively prevent scale from accumulating on the heating rod. The scale deposits will be separated from the steam barrel in sequence and enter the scale collection tank. This design ensures convenient maintenance and greatly extends the maintenance interval. A cold water area is designed and manufactured between the outer barrel wall and the inner barrel wall of the humidifier barrel, the water inlet and the drain. When the water temperature in the area is lower than the scaling temperature, scale deposition will not occur. This design can not only prevent the inlet and outlet from being blocked, but also extend the maintenance interval. The external scale collection tank installed at the bottom of the humidifier barrel is convenient for collecting scale that falls off from the resistor and the inner wall of the plastic. The steps of draining, picking, emptying the scale and reinstalling the main unit can be completed in a few minutes without opening the main unit. The technical parameters of the humidifier 4 are as follows: model: RS40; maximum steam output: 40kg / h; heating voltage: 400VAC / 3Ph / 50-60Hz; control voltage: 230VAC / 1Ph / 50-60Hz; size (W*H*D) (mm): 530*1097*406; operating weight (kg): 65.8.

[0039] The controller 1 is connected to a first detection unit 6, which is used to detect the gas temperature, humidity and pressure at the engine intake end. The controller 1 dynamically adjusts the gas temperature, humidity and pressure output by the secondary temperature control device 5 based on the preset intake factor of the engine and the detection data of the first detection unit 6. The preset intake factor of the engine includes parameters such as preset intake temperature, humidity and pressure. After the first detection unit 6 detects the gas temperature, humidity and pressure at the engine intake end, the controller 1 compares it with the preset intake factor of the engine, and then adjusts the operating status of the air conditioning unit 2, the primary temperature control device, the air compressor 3, the humidifier 4 and the secondary temperature control device 5, thereby dynamically adjusting the gas temperature, humidity and pressure output by the secondary temperature control device 5, so that the gas temperature, humidity and pressure at the engine intake end match the preset intake factor of the engine.

[0040] Among them, the first detection unit 6 includes a first temperature and humidity sensor and a first pressure transmitter, which can detect the gas temperature, humidity and pressure at the engine intake end. The first detection unit 6 is arranged at an appropriate position behind the hard straight pipe at the front end of the engine intake port to measure the temperature, humidity and pressure of the engine intake. The first temperature and humidity sensor adopts a high-precision temperature and humidity sensor, which is mainly used at the end of the intake simulation system, close to the inlet end of the engine, for accurately measuring the temperature and humidity of the engine intake. The first pressure transmitter adopts a gefran pressure transmitter, which combines mature silicon technology, full analog circuits, modular design and manufacturing technology, which significantly improves the measurement accuracy and stability of the sensor. This series of pressure sensors can be widely used in industries such as oil and gas, automobiles, ships, railways, aerospace, test equipment and process industries.

[0041] In this embodiment, the output end of the secondary temperature control device 5 is provided with a second detection unit 7, which is used to detect the gas temperature, humidity and pressure at the output end of the secondary temperature control device 5, and the second detection unit 7 is connected to the controller 1. The second detection unit 7 includes a second temperature and humidity sensor and a second pressure transmitter, which can detect the gas temperature, humidity and pressure at the output end of the secondary temperature control device 5. The controller 1 can calculate the loss of gas in transportation according to the detection data of the second detection unit 7 and the first detection unit 6, so as to accurately adjust the intake pressure of the engine.

[0042] A third detection unit 24 is provided at the output end of the primary temperature control device. The third detection unit 24 includes a third temperature and humidity sensor and a third pressure transmitter, and can detect the gas temperature, humidity and pressure at the output end of the primary temperature control device, so that the controller 1 can control the operating state of the primary temperature control device. A fourth detection unit 25 is provided at the output end of the air-conditioning unit 2. The fourth detection unit 25 includes a fourth temperature and humidity sensor and a fourth pressure transmitter, and can detect the gas temperature, humidity and pressure at the output end of the air-conditioning unit 2, so that the controller 1 can control the operating state of the air-conditioning unit 2.

[0043] Preferably, a connecting pipe 8 is provided between the output end of the secondary temperature control device 5 and the intake end of the engine, and an intermediate pressure sensor 9 is provided on the connecting pipe 8. The intermediate pressure sensor 9 is connected to the controller 1. The controller 1 calculates the pressure loss of the connecting pipe 8 based on the detection data of the first detection unit 6, the second detection unit 7 and the intermediate pressure sensor 9, and obtains the corresponding relationship between the pressure value of the output end of the secondary temperature control device 5 and the pressure value of the intake end of the engine. The intermediate pressure sensor 9 is arranged in the middle of the connecting pipe 8. By comparing and calculating the detection data of the first detection unit 6, the second detection unit 7 and the intermediate pressure sensor 9, the corresponding relationship between the pressure value of the output end of the secondary temperature control device 5 and the pressure value of the intake end of the engine is obtained, thereby improving the adjustment accuracy of the intake pressure of the engine.

[0044] The air conditioning unit 2 is provided with a mixing section, and the mixing section is sequentially connected with a filtering section, a primary temperature control section, an air supply section, a humidifying section and a secondary temperature control section. The primary temperature control section is provided with a primary temperature control device, the air supply section is provided with an air compressor 3, the humidifying section is provided with a humidifying device 4, and the secondary temperature control section is provided with a secondary temperature control device 5. The mixing section is provided with a fresh air fan, and the filtering section is provided with an air filter. The air filter has the ability to remove dust (≤2μm) and oil (≤1mg / m3) from the intake air, and the filter element replacement cycle of the air filter should be greater than 2000 hours. The primary temperature control section is provided with a primary temperature control device to preliminarily adjust the temperature of the air. The air supply section is provided with an air compressor 3 to pressurize the air. The humidifying section is provided with a humidifying device 4 to humidify the air. The secondary temperature control section is provided with a secondary temperature control device 5 to accurately adjust the temperature of the air.

[0045] As an optional solution of this embodiment, the primary temperature control device includes a primary cooler 10 and a primary heater 11, both of which are arranged in the primary temperature control section, and the primary cooler 10 is equipped with a refrigeration unit. The primary cooler 10 has a refrigeration unit, which can maintain the temperature of the air to 2-12 degrees. The primary heater 11 can heat the air appropriately as needed, thereby completing the preliminary adjustment of the air temperature.

[0046] As an optional solution of this embodiment, the secondary temperature control device 5 includes a primary exchanger 12 and a secondary exchanger 13, the secondary exchanger 13 is arranged in the secondary temperature control section, a secondary circulating water pipe is provided between the secondary exchanger 13 and the primary exchanger 12, a secondary heater 14 is provided on the secondary circulating water pipe, the primary exchanger 12 is connected to the primary circulating water pipe, and the primary circulating water pipe serves as an external circulating water pipe, which can appropriately adjust the temperature of the secondary circulating water pipe.

[0047] Specifically, the secondary circulating water pipe includes a secondary water inlet pipe 15 and a secondary water outlet pipe 16, the two ends of the secondary water inlet pipe 15 are respectively connected to the output end of the primary exchanger 12 and the input end of the secondary exchanger 13, the two ends of the secondary water outlet pipe 16 are respectively connected to the input end of the primary exchanger 12 and the output end of the secondary exchanger 13, an intermediate water pipe 17 is connected between the secondary water inlet pipe 15 and the secondary water outlet pipe 16, the intermediate water pipe 17 is provided with a secondary heater 14, the secondary water inlet pipe 15 is provided with a circulating water pump 18 and a three-way proportional valve 19, and one end of the intermediate water pipe 17 is connected to the three-way proportional valve 19.

[0048] The secondary water outlet pipe 16 is provided with an expansion water tank 20, a first temperature sensor and a first pressure sensor, the secondary water inlet pipe 15 is provided with a second temperature sensor and a second pressure sensor, and the first temperature sensor, the first pressure sensor, the second temperature sensor and the second pressure sensor are all connected to the controller 1. The primary circulating water pipe includes a primary water inlet pipe 21 and a primary water outlet pipe 22, the primary water inlet pipe 21 and the primary water outlet pipe 22 are both connected to the primary exchanger 12, and a water filter 23 is provided on the primary water inlet pipe 21.

[0049] The overall performance parameters of the engine intake simulation system of the present invention are as follows:

[0050] Temperature setting value 18-32℃, control accuracy ±1.0℃;

[0051] Humidity setting value 35-65%RH, control accuracy ±3.0%RH;

[0052] The negative pressure at the air inlet is not less than -30mbar;

[0053] When the intake air temperature, humidity and pressure undergo a step change in the intake air volume, the response time T90 is less than 30 seconds;

[0054] When the engine is running in transient conditions, refer to the dynamic cycle requirements in GB 17691-2018;

[0055] The engine intake volume changes second by second as the operating conditions require;

[0056] Temperature setting value 15-35℃, control accuracy ±1.0℃;

[0057] Humidity setting value 35-65%RH, control accuracy ±3.0%RH;

[0058] When the intake air temperature, humidity and pressure change with the operating conditions, the response time T90 is less than 1.0 second.

[0059] The present invention is suitable for simulating the temperature, humidity and pressure test of the engine, creating standard intake conditions, and simulating the actual operating environment of the engine as much as possible, thereby increasing the reliability of the test. The system has the advantages of being simple and reliable, low investment, low energy consumption, low operation and maintenance cost, full functions and accurate control of the engine intake conditions.

[0060] In the description of the present invention, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, and may be fixedly connected, detachably connected, or integrated; may be mechanically connected or electrically connected; may be directly connected or indirectly connected through an intermediate medium, may 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, etc. described in the embodiments are included in at least one embodiment. Under the condition that there is no contradiction, those skilled in the art may combine the features of different embodiments. The protection scope of the present invention is not limited to the above-mentioned specific embodiments. According to the basic technical concept of the present invention, the embodiments that can be associated with by ordinary technicians in this field without creative work all belong to the protection scope of the present invention.

Claims

1. An engine intake simulation system, characterized in that: The invention comprises a controller (1), an air conditioning unit (2), a primary temperature control device, an air compressor (3), a humidifying device (4) and a secondary temperature control device (5), wherein the air conditioning unit (2), the primary temperature control device, the air compressor (3), the humidifying device (4) and the secondary temperature control device (5) are connected in sequence, and the output end of the secondary temperature control device (5) is connected to the air intake end of the engine; the controller (1) is connected to the air conditioning unit (2), the primary temperature control device, the air compressor (3), the humidifying device (4) and the secondary temperature control device (5) respectively, and the controller (1) is used to control the operating states of the air conditioning unit (2), the primary temperature control device, the air compressor (3), the humidifying device (4) and the secondary temperature control device (5) respectively, so as to dynamically adjust the temperature, humidity and pressure of the gas output by the secondary temperature control device (5); The controller (1) is connected to a first detection unit (6), the first detection unit (6) being used to detect the temperature, humidity and pressure of the gas at the intake end of the engine, and the controller (1) dynamically adjusts the temperature, humidity and pressure of the gas output by the secondary temperature control device (5) based on a preset intake factor of the engine and detection data of the first detection unit (6); The output end of the secondary temperature control device (5) is provided with a second detection unit (7), the second detection unit (7) is used to detect the gas temperature, humidity and pressure at the output end of the secondary temperature control device (5), and the second detection unit (7) is connected to the controller (1); A connecting pipe (8) is provided between the output end of the secondary temperature control device (5) and the air intake end of the engine. An intermediate pressure sensor (9) is provided on the connecting pipe (8). The intermediate pressure sensor (9) is connected to the controller (1). The controller (1) obtains the corresponding relationship between the pressure value at the output end of the secondary temperature control device (5) and the pressure value at the air intake end of the engine by calculating the pressure loss of the connecting pipe (8) based on the detection data of the first detection unit (6), the second detection unit (7) and the intermediate pressure sensor (9), and dynamically adjusts the temperature, humidity and pressure of the gas output by the secondary temperature control device (5).

2. The engine intake simulation system according to claim 1, characterized in that: The air conditioning unit (2) is provided with a mixing section, the mixing section is sequentially connected to a filtering section, a primary temperature control section, an air supply section, a humidification section and a secondary temperature control section, the primary temperature control section is provided with a primary temperature control device, the air supply section is provided with an air compression device (3), the humidification section is provided with a humidification device (4), and the secondary temperature control section is provided with a secondary temperature control device (5).

3. The engine intake simulation system according to claim 2, characterized in that: The primary temperature control device comprises a primary surface cooler (10) and a primary heater (11), wherein the primary surface cooler (10) and the primary heater (11) are both arranged in the primary temperature control section, and the primary surface cooler (10) is equipped with a refrigeration unit.

4. The engine intake simulation system according to claim 2, characterized in that: The secondary temperature control device (5) comprises a primary exchanger (12) and a secondary exchanger (13), wherein the secondary exchanger (13) is arranged in the secondary temperature control section, a secondary circulating water pipe is arranged between the secondary exchanger (13) and the primary exchanger (12), a secondary heater (14) is arranged on the secondary circulating water pipe, and the primary exchanger (12) is connected to the primary circulating water pipe.

5. The engine intake simulation system according to claim 4, characterized in that: The secondary circulating water pipe comprises a secondary water inlet pipe (15) and a secondary water outlet pipe (16), the two ends of the secondary water inlet pipe (15) are respectively connected to the output end of the primary exchanger (12) and the input end of the secondary exchanger (13), the two ends of the secondary water outlet pipe (16) are respectively connected to the input end of the primary exchanger (12) and the output end of the secondary exchanger (13), an intermediate water pipe (17) is connected between the secondary water inlet pipe (15) and the secondary water outlet pipe (16), the intermediate water pipe (17) is provided with a secondary heater (14), the secondary water inlet pipe (15) is provided with a circulating water pump (18) and a three-way proportional valve (19), and one end of the intermediate water pipe (17) is connected to the three-way proportional valve (19).

6. The engine intake simulation system according to claim 5, characterized in that: The secondary water outlet pipe (16) is provided with an expansion water tank (20), a first temperature sensor and a first pressure sensor, and the secondary water inlet pipe (15) is provided with a second temperature sensor and a second pressure sensor.

7. The engine intake simulation system according to claim 5, characterized in that: The primary circulating water pipe comprises a primary water inlet pipe (21) and a primary water outlet pipe (22), wherein the primary water inlet pipe (21) and the primary water outlet pipe (22) are both connected to the primary exchanger (12), and a water filter (23) is provided on the primary water inlet pipe (21).

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