A detection system and detection method for a vehicle air treatment unit

Abstract

The present invention relates to the field of performance detection of air handling units, and discloses a detection system and a detection method for a vehicle air handling unit, which includes an air source treatment module (1). The air source treatment module (1) includes an air compressor module (2) and a first switching valve (3), a first oil and gas separator (4), a first water filter (5), an air storage tank (6), a stop valve (7), a flow regulating valve (8), a pressure ratio valve (9), a first flowmeter (10) and a second switching valve (12) connected in sequence along the gas path. A second flowmeter assembly (13) is connected in parallel to the gas path from the first flowmeter (10) to the second switching valve (12). The second switching valve (12) is used to connect to the subsequent air conditioning system (16). This system has the advantages of controllable detection process and high accuracy of detection results.

Description

Technical Field

[0001] The present invention relates to the field of detection equipment, and particularly to a detection system and method for a vehicle air treatment unit. Background Art

[0002] Compressed air is crucial for vehicles. For example, compressed air is used in the braking system of vehicles. Compressed air is generally generated and stored by an air compressor in cooperation with an air storage tank. In order to avoid the impact of compressed air on automotive parts, it is generally necessary to treat the air. The air treatment components include functions such as air drying and oil-water separation of air. In order to ensure the reliable performance of the air treatment unit, it is necessary to perform performance detection on the air treatment unit. In order to ensure the accuracy of the test results, a reliable and controllable system is required for measurement.

[0003] Chinese Patent CN201810968044.1 discloses a performance test system for an air filter. Although this solution can detect the filtering performance, it is obvious that it cannot be used for detecting the performance of a dryer and a condenser.

[0004] According to the requirements of the existing air treatment unit performance, the applicant has designed a brand-new detection system for a vehicle air treatment unit. Summary of the Invention

[0005] Aiming at the disadvantages of the lack of a stable and reliable detection system in the prior art, the present invention provides a detection system and method for a vehicle air treatment unit.

[0006] In order to solve the above technical problems, the present invention is solved by the following technical solutions:

[0007] A detection system for a vehicle air treatment unit includes an air source treatment module. The air source treatment module includes an air compression module and a first switching valve, a first oil and gas separator, a first water filter, an air storage tank, a stop valve, a flow regulating valve, a pressure ratio valve, a first flowmeter, and a second switching valve that are sequentially connected along the gas path. A second flowmeter assembly is connected in parallel on the gas path from the first flowmeter to the second switching valve. The second switching valve is used to connect to the subsequent air conditioning system. By processing the air source pressure, the influence on the detection results is eliminated.

[0008] Preferably, the air compression module includes a vehicle air compression device and a special air compression device. The vehicle air compression device and the special air compression device are connected to the first switching valve. The first switching valve is used to switch the vehicle air compression device and the special air compression device according to needs.

[0009] Preferably, the air conditioning system includes a compressed air oil content regulating system and an air heating and humidifying system. The outlet end of the air source treatment module is connected to the compressed air oil content regulating system. The compressed air oil content regulating system includes an oil adding system, an oil content monitoring device, and a controller. The oil adding system includes an oil storage tank, in which a pressurizing piston is arranged. The oil outlet of the oil storage tank is connected to an atomizing nozzle through a pipeline. The oil outlet end of the atomizing nozzle is connected to a mixing chamber. The outlet end of the air source treatment module communicates with the mixing chamber.

[0010] Preferably, the outlet end of the air source treatment module is also connected to an air heating and humidifying system. The air heating and humidifying system includes a remote pressure control valve, a second flowmeter, an air pipeline heating device, a one-way valve, and a dry and wet air mixing device connected in sequence. A humidifying device is bypassed beside the dry and wet air mixing device. The humidifying device is a high-pressure micro mist humidifying system.

[0011] Preferably, it further includes a measurement and control system. The measurement and control system includes a PLC controller and a humidity sensor, a temperature sensor, and a dew point meter connected to the PLC controller.

[0012] Preferably, it further includes an output measurement loop. The output measurement loop includes a drying efficiency measurement loop and an oil / water content measurement loop. The drying efficiency measurement loop consists of an air storage tank, a variable air capacitance, a flow sensor, a load ratio regulating valve, a temperature sensor, and a humidity sensor. The oil / water content measurement loop is used for the separation efficiency and oil content detection of the condenser, and includes an oil content detection system, a water filter, a liquid water collector, and a load regulating device.

[0013] The present invention also provides a detection method for a vehicle air treatment unit. The vehicle treatment unit includes a condenser and a dryer. The detection method further includes the above-mentioned detection system for the vehicle air treatment unit. The detection method is realized through the following steps:

[0014] Step 1: Connect the air conditioning system and the air source treatment module in an air path.

[0015] Step 2: Connect the inlet end of the dryer to the air conditioning system in an air path, and connect the outlet end to the output measurement loop in an air path.

[0016] Step 3: Measure the pressure difference at the inlet. Close the air heating and humidifying system, adjust the inlet air flow through the proportional flow valve, and then measure the pressures at the inlet and outlet of the dryer, so as to measure the pressure difference between the inlet and outlet.

[0017] Step 3: Test the dryer flow rate. Repeat Step 2. Close the air heating and humidifying system. Connect the outlet of the dryer to the atmosphere. Adjust the inlet air pressure through the proportional flow valve and measure the inlet air source flow rate.

[0018] Step 4: Detect the drying capacity of the dryer. Repeat Step 2, adjust the input flow rate and pressure of the air source to meet the detection standards, turn on the air heating and humidifying system, detect the current temperature and humidity signals through the temperature sensor and humidity sensor, and the controller collects the above signals to perform closed-loop control on the heating and humidifying system to make the air meet the temperature and humidity requirements;

[0019] By controlling the on / off of the pressure relief solenoid valve, pressurize and depressurize the dryer to make the outlet pressure cycle periodically until the dew point temperature of the air in the air storage cylinder connected to the outlet reaches stability; record the volume of the air storage cylinder and the dew point drop of the air in the air storage cylinder of the test system at this time. During the test, the pressure relief time should be greater than twice the pressurization time, that is, the load rate is less than 33%. Adjust the load rate by adjusting the pressure relief and pressure regulating valve;

[0020] Increase the volume of the air storage cylinder through the variable air capacitance and continue the test until the dew point of the air in the air storage cylinder is lower than 17°C. Calculate the volume of the air processed in one cycle when the dew point drop of the air in the air storage cylinder is 17°C. This volume is the drying volume and drying capacity of the air dryer;

[0021] Step 5: Detect the backup capacity of the dryer. Continue to increase the volume of the air storage cylinder for the test until the dew point of the air in the air storage cylinder is lower than 5°C; calculate the volume of the air processed in one cycle when the dew point drop of the air in the air storage cylinder is 5°C. The volume obtained by subtracting the drying volume measured for the drying capacity and drying efficiency from this volume is the backup capacity of the air dryer;

[0022] Step 6: Recovery of the dryer. Adjust the volume of the air storage cylinder to the theoretical drying volume, that is, the drying volume calculated in the design, and continue the cycle test until the dew point drop of the air in the air storage cylinder reaches 14°C; record the number of cycles when the dew point drop of the air in the air storage cylinder changes from 5°C to 14°C;

[0023] Preferably, it also includes water separation efficiency detection and oil separation efficiency detection. The water separation efficiency detection includes the following steps:

[0024] Step 7: Connect the inlet end of the condenser to the air circuit of the air conditioning system and the outlet end to the air circuit of the output measurement circuit;

[0025] Step 8: Adjust the flow rate, humidity, and pressure of the compressed air to the set values according to the actual vehicle parameters. After a period of time, collect the volume of the liquid water at the drainage outlets of the condenser and the water filter, and calculate the water separation efficiency of the condenser;

[0026] Step 9: Adjust the flow rate, humidity, pressure, and oil content of the compressed air to the set values according to the actual vehicle parameters. After a period of time, measure the values of the oil content sensors at the inlet and outlet of the condenser, and calculate the oil removal efficiency;

[0027] Step 10: Adjust the compressed air flow rate, humidity, pressure, and temperature to the set values according to the actual vehicle parameters, adjust the output load. After a period of time, collect the drainage from the condenser drain and the water filter drain, measure the compressed air temperature at the inlet and outlet of the condenser, and calculate the temperature difference at the outlet.

[0028] Due to the adoption of the above technical solutions, the present invention has the following remarkable technical effects:

[0029] The device first controls the quality of the gas source gas at the source, and then performs secondary treatment on the air according to the test items and test requirements, so that the gas can meet various detection conditions. Moreover, the state control of the gas in the entire detection system is closed-loop feedback control, thus ensuring the accuracy of the control. And this test system can detect the performance of the dryer and condenser, and it has the advantages of good detection effect, high detection accuracy, high credibility of detection data, and simple control. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is the overall structural schematic diagram of the device.

[0031] Figure 2 is the functional diagram of the heating and humidifying system.

[0032] Figure 3 is the functional diagram of the gas source treatment module.

[0033] The names of the parts referred to by the numerical labels in the drawings are as follows: 1 - gas source treatment module, 2 - air compressor module, 3 - first switching valve, 4 - first oil and gas separator, 5 - first water filter, 6 - gas storage tank, 7 - stop valve, 8 - flow regulating valve, 9 - pressure ratio valve, 10 - first flowmeter, 12 - second switching valve, 13 - second flowmeter assembly, 14 - vehicle air compressor device, 15 - special air compressor device, 16 - air conditioning system, 17 - compressed air oil content regulating system, 18 - air heating and humidifying system, 19 - remote pressure control valve, 20 - second flowmeter, 22 - dry and wet air mixing device, 23 - humidifying device, 24 - PLC controller, 25 - humidity sensor, 26 - temperature sensor, 27 - dew point meter, 28 - dry efficiency measurement circuit, 29 - oil / water content measurement circuit, 30 - variable air capacitance, 31 - flow sensor, 32 - oil content detection system, 33 - liquid water collector, 35 - dryer, 36 - condenser, 50 - output measurement circuit. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] The present invention will be further described in detail below in conjunction with the drawings and embodiments.

[0035] Embodiment 1

[0036] As Figures 1 to 3As shown in the figure, a detection system for a vehicle air treatment unit includes an air source treatment module 1. The air source treatment module 1 includes an air compressor module 2, and a first switching valve 3, a first oil and gas separator 4, a first water filter 5, an air storage tank 6, a stop valve 7, a flow regulating valve 8, a pressure proportional valve 9, a first flowmeter 10, and a second switching valve 12 that are connected in sequence along the gas path. A second flowmeter assembly 13 is connected in parallel to the gas path from the first flowmeter 10 to the second switching valve 12. The second switching valve 12 is used to connect to the subsequent air conditioning system 16, specifically for selecting a compressed air oil content adjustment system 17 or an air heating and humidifying system 18 to adapt to different test requirements. Among them, the first switching valve 3 is used to select a vehicle air compressor device 14 or a dedicated air compressor device 15 for air supply, and the dedicated air compressor device 15 is used to supply air for the dryer detection. The technical solution protects a detection system for a vehicle air treatment unit, which consists of three parts: an air source treatment module 1, an air conditioning system 16, and an output measurement circuit 50;

[0037] Among them: The air source treatment module 1 provides compressed air of qualified quality for the entire detection system;

[0038] The air conditioning system 16 is used to quantitatively control and change the gas of the air source treatment module 1, so that various parameters of the compressed air at the air outlet end can meet the conditions required for detection; and the output end of the air conditioning system 16 is used to connect to the air inlet of the unit under test;

[0039] The output measurement circuit 50 is used to connect the gas path to the air outlet end of the unit under test and cooperate with the air conditioning system 16 to measure the changes that occur to the gas after passing through the unit under test, so as to measure the various performances of the air treatment unit.

[0040] In this embodiment, there are two sets of devices for generating compressed air, that is, the air compressor module 2 includes a vehicle air compressor device 14 and a dedicated air compressor device 15. The vehicle air compressor device 14 and the dedicated air compressor device 15 are connected to the first switching valve 3, and the first switching valve 3 is used to switch between the vehicle air compressor device 14 and the dedicated air compressor device 15 as needed. Since the detection of the performance of the dryer 35 has high requirements for compressed air and the output compressed air pressure needs to be quickly changed during the detection process, the designed dedicated air compressor device 15 can adjust the pressure of the compressed air at the output end in real time.

[0041] Among them, the vehicle air compressor device 14 consists of a motor, a vehicle air compressor, a belt drive, a lubrication system, a cooling system, an oil mist separation system, etc. The motor drives the vehicle air compressor through a belt drive, and controls the start and stop of the air compressor through the pressure feedback of the air storage tank 6.

[0042] The lubrication system consists of a hydraulic pump, a pressure regulating valve, a filter, a pressure sensor, a temperature sensor, a heater and a fuel tank. Under the control of a microcomputer, the start and stop of the oil pump are automatically controlled, the oil pressure is automatically controlled by frequency conversion, the oil temperature is automatically controlled, and the fuel tank is automatically alarmed when it is short of oil. The lubricating oil is sent into the air compressor through a hydraulic pipe.

[0043] The cooling system consists of a water pump, a flow regulating valve, a filter, a remote pressure gauge, a flow meter, a temperature sensor 26, a radiator and a water tank. Under the control of a microcomputer, the start and stop of the water pump are automatically controlled, the water temperature is automatically controlled, the water pressure and water flow are manually adjusted, and the water tank is automatically alarmed when it is short of water. The cooling water is sent into the air compressor through an infusion pipe.

[0044] In this embodiment, the design parameters of the air conditioning system 16 and the air source treatment system are as follows:

[0045] Air source temperature at the inlet: -3°C to 45°C;

[0046] Air source humidity at the inlet: ≤20% RH;

[0047] Air source pressure at the inlet: 1.8 MPa;

[0048] Air source flow at the inlet: 1500 L / min;

[0049] The outlet air temperature has the ability to be controllable and adjustable: 45°C to 90°C;

[0050] Air source humidity at the outlet: 85% RH to 100% RH;

[0051] Air source flow at the outlet: 1500 L / min;

[0052] Temperature deviation: ±2°C;

[0053] Humidity deviation: ±3% RH.

[0054] In this embodiment, the air conditioning system 16 includes a compressed air oil content regulation system 17 and an air heating and humidifying system 18. The outlet end of the air source treatment module 1 is connected to the compressed air oil content regulation system 17. The compressed air oil content regulation system includes an oil adding system 80, an oil content monitoring device 81 and a controller. The oil adding system 80 includes a storage tank, a pressurizing piston is arranged in the storage tank, the oil outlet of the storage tank is connected with an atomizing nozzle through a pipeline, the oil outlet end of the atomizing nozzle is connected with a mixing chamber, and the outlet end of the air source treatment module 1 is communicated with the mixing chamber. The oil content detection device is connected with the controller and feeds back the oil content in the air to the controller in real time. The controller controls the start and stop of the oil adding system 80 according to whether the current parameters reach the preset values.

[0055] Since this system is used to add oil to compressed air and the system itself has a certain pressure, the ordinary oil addition method will not be able to complete. Therefore, in this device, the oil is first pressurized by a piston and then atomized through a nozzle and added to the compressed air. The amount of oil added to the air is controlled by adjusting the aperture size of the nozzle.

[0056] The oil content detection in the air will use an oil content monitoring device to continuously detect the oil content at any point of the flowing compressed air. A highly sensitive sensor is used and it is ensured to immediately monitor any change in the oil content. Among them, the oil content monitoring is based on the dynamic hydrocarbon detection method, including: equal dynamic sampling and calorimetric spectroscopy analysis sensor. The temperature, pressure and sampling flow values will be controlled in real time. The sensor surface is adsorbed with oxygen atoms. If the sampling contains hydrocarbons, the oxygen atoms will immediately react with them by displacement reaction. Once all the hydrocarbons in the sampling gas are displaced, their positions will all be occupied by oxygen atoms. The voltage change caused by such displacement will be converted into the residual oil content value through corresponding analysis. A PID sensor can also be used to replace this detection method.

[0057] The air outlet end of the air source treatment module 1 is also connected with an air heating and humidifying system 18. The air heating and humidifying system 18 includes a remote pressure control valve 19, a second flowmeter 20, an air pipeline heating device 60, a one-way valve 61, and a dry and wet air mixing device 22 connected in sequence. A humidifying device 23 is bypassed beside the dry and wet air mixing device 22. The humidifying device 23 is a high-pressure micro-mist humidifying system. The heating device is an on-line compressed air heater. When the air source flow changes, the heating coil and the temperature sensor 26 cooperate to work, and then through the PID control of the controller, so as to quickly respond to the change and achieve the purpose of temperature controllability.

[0058] Since the entire air source is a pressurized air source, the conventional atomization humidification cannot complete the humidification action of the system. This device adopts a high-pressure micro-mist humidifying system. The water pressure is increased by a high-pressure plunger pump and transported through a high-pressure pipeline to a professional nozzle for atomization, generating micro-mist particles of 3 - 15 μm. The output is adjusted through PID to complete the purpose of humidification. The high-pressure micro-mist humidifying system includes a humidity sensor 25, and the humidity sensor 25 is connected to the controller.

[0059] The measurement and control system in this embodiment includes a PLC controller 24 and a humidity sensor 25, a temperature sensor 26, a dew point meter and a pressure sensor connected to the PLC controller 24, so as to control parameters such as the pressure, humidity and temperature of the air source. In this embodiment, the air source parameters of the air conditioning system 16 are calculated with the outlet end as the calculation point. Therefore, the temperature sensor 26, the humidity sensor 25 and the dew point meter at the air source outlet are all installed at the air source outlet.

[0060] The device further includes an output measurement circuit 50, and the output measurement circuit 50 includes a drying efficiency measurement circuit 28 and an oil / water content measurement circuit 29. The drying efficiency measurement circuit 28 consists of an air storage tank 6, a variable air capacitance 30, a flow sensor 31, a load ratio regulating valve, a temperature sensor 26, and a humidity sensor 25. The oil / water content measurement circuit 29 is used for detecting the separation efficiency and oil content of the condenser 36, and includes an oil content detection system 32, a water filter, a liquid water collector 33, and a load regulating device.

[0061] The vehicle processing unit includes a condenser 36 and a dryer 35, and the tests include the following items:

[0062] Dryer 35: Differential pressure between the inlet and outlet, flow rate of the dryer 35, drying capacity and efficiency, reserve capacity of the dryer 35, recovery of the dryer 35, high-temperature durability.

[0063] Condenser 36: Water separation efficiency, oil separation efficiency, temperature difference between the inlet and outlet.

[0064] The detection of the dryer 35 is achieved through the following steps:

[0065] Step 1: Connect the air conditioning system 16 and the air source processing module 1 in an air path.

[0066] Step 2: Connect the inlet end of the dryer 35 to the air conditioning system 16 in an air path, and connect the outlet end to the output measurement circuit 50 in an air path.

[0067] Step 3: Measure the differential pressure at the inlet. Close the air heating and humidifying system 18, adjust the inlet air flow through the proportional flow valve, and then measure the pressures at the inlet and outlet of the dryer 35 to measure the differential pressure between the inlet and outlet. The inlet air flow can also be adjusted to 140 L / min, 280 L / min, 420 L / min through the proportional flow valve, and the output pressure is adjusted to 830 kPa to measure the differential pressure between the inlet and outlet.

[0068] Step 3: Test the flow rate of the dryer 35. Repeat Step 2, close the air heating and humidifying system 18, connect the outlet of the dryer 35 to the atmosphere, and adjust the inlet air pressure to 140 kPa through the proportional flow valve to measure the inlet air source flow rate.

[0069] Step 4: Detect the drying capacity of the dryer 35. Repeat Step 2, adjust the air source input flow rate and pressure to meet the detection standards, turn on the air heating and humidifying system 18, detect the current temperature and humidity signals through the temperature sensor 26 and the humidity sensor 25, and the controller collects the above signals to perform closed-loop control on the heating and humidifying system to make the air meet the temperature and humidity requirements.

[0070] By controlling the on / off of the pressure relief solenoid valve, the pressurization and depressurization of the dryer 35 are realized, so that the outlet pressure undergoes a periodic cycle until the dew point temperature of the air in the air storage cylinder connected to the outlet reaches stability; record the volume of the air storage cylinder and the dew point drop of the air in the air storage cylinder of the test system at this time. During the test, the depressurization time should be more than twice the pressurization time, that is, the load rate is less than 33%, and the load rate is adjusted by adjusting the pressure relief regulating valve.

[0071] By increasing the volume of the air storage cylinder through the variable air capacitance 30, continue the test until the dew point of the air in the air storage cylinder is lower than 17°C. Calculate the volume of air processed in one cycle when the dew point drop of the air in the air storage cylinder is 17°C. This volume is the drying volume and drying capacity of the air dryer 35; for the system flushing dryer 35, the flushing volume should be subtracted. Calculate the drying efficiency. If the adjusted volume is greater than 200L, then control the air release through the volume increase valve, and the flow sensor 31 and the pressure and temperature sensor 26 calculate the increased volume.

[0072] Step Five: Detection of the backup capacity of the dryer 35. Continue to increase the volume of the air storage cylinder for the test until the dew point of the air in the air storage cylinder is lower than 5°C; calculate the volume of air processed in one cycle when the dew point drop of the air in the air storage cylinder is 5°C. The volume obtained by subtracting the drying volume measured by the drying capacity and drying efficiency from this volume is the backup capacity of the air dryer 35; for the system flushing dryer 35, the flushing volume should also be subtracted.

[0073] Step Six: Recovery of the dryer 35. Adjust the volume of the air storage cylinder to the theoretical drying volume, that is, the drying volume calculated by design, and continue the cyclic test until the dew point drop DPD22 of the air in the air storage cylinder reaches 14°C; record the number of cycles when the dew point drop of the air in the air storage cylinder changes from 5°C to 14°C.

[0074] It also includes the durability test of the dryer 35

[0075] Connect the sample of the dryer 35 assembly to be tested to the test system as required and conduct the test under the following test conditions:

[0076] a) Test pressure: (Pe - 100)~(Pe - 30) kPa;

[0077] b) Air flow rate: 455~510 L / min;

[0078] c) Ambient temperature: 19~25°C;

[0079] d) Inlet air temperature: (Tmax + 10°C) ± 5°C;

[0080] e) Test frequency: 5~40 times / min;

[0081] f) Number of cycles: user-defined.

[0082] To ensure the operation of the one-way valve 61 at the air outlet, during the test, the air outlet of the dryer 35 should be connected to the atmosphere through a throttling device with a pore diameter of 1.5 mm or an equivalent device.

[0083] It also includes the performance test of the condenser 36

[0084] It includes the detection of water separation efficiency and oil separation efficiency. The detection of water separation efficiency includes the following steps:

[0085] Step 7: Connect the air inlet end of the condenser 36 to the air circuit of the air conditioning system 16, and the air outlet end to the output measurement circuit 50; the air compressor device used is a vehicle-mounted air compressor device;

[0086] Step 8: Adjust the flow rate, humidity, and pressure of the compressed air to the set values according to the actual vehicle parameters. After a period of time, collect the volume of the liquid water at the drain outlet of the condenser 36 and the water filter, and calculate the water separation efficiency of the condenser 36;

[0087] Step 9: Adjust the flow rate, humidity, pressure, and oil content of the compressed air to the set values according to the actual vehicle parameters. After a period of time, measure the values of the oil content sensors at the inlet and outlet of the condenser 36, and calculate the oil removal efficiency;

[0088] Step 10: Adjust the flow rate, humidity, pressure, and temperature of the compressed air to the set values according to the actual vehicle parameters, adjust the output load. After a period of time, collect the drain outlet of the condenser 36 and the water filter drain outlet, measure the compressed air temperature at the inlet and outlet of the condenser 36, and calculate the temperature difference at the air outlet.

[0089] Embodiment 2

[0090] The difference between this embodiment and Embodiment 1 is that the measurement and control system is composed of hardware such as an industrial control computer, a printer, a special computer interface board, a sensor amplifier, a signal filtering processor, and a power supply purifier, and is equipped with relevant software, thus having the following functions:

[0091] 1. It has an aesthetic and convenient man-machine dialogue interface;

[0092] 2. The control software has a modular design function, which can meet customized tests and complete a series of special test requirements through the combination of each module;

[0093] 3. It has the function of dynamically displaying the condition parameter values and measurement parameter values;

[0094] 4. It has the function of analyzing and processing the measured data and curves, and then outputting them in the form of a test report through a printer;

[0095] 5. It has a database where the measured data can be stored, and the information in the database can be queried by date, sample number, browsing, etc.

[0096] Embodiment 3

[0097] The difference from Embodiment 1 is that: this system further includes a safety exhaust system, which is mainly used to discharge the gas with pressure, temperature and humidity discharged during the test to the outside to avoid safety problems and affecting the normal test.

[0098] In summary, the above are only the preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope covered by the patent of the present invention.

Claims

1. A detection method for a vehicle air treatment unit, characterized in that: The vehicle treatment unit includes a condenser (36) and a dryer (35). The detection method adopts a detection system for a vehicle air treatment unit as follows. The detection system includes an air source treatment module (1). The air source treatment module (1) includes an air compressor module (2) and a first switching valve (3), a first oil and gas separator (4), a first water filter (5), an air storage tank (6), a stop valve (7), a flow regulating valve (8), a pressure proportional valve (9), a first flowmeter (10) and a second switching valve (12) connected in sequence along the gas path. A second flowmeter assembly (13) is connected in parallel on the gas path from the first flowmeter (10) to the second switching valve (12). The second switching valve (12) is used to connect to the subsequent air conditioning system (16); the air compressor module (2) includes a vehicle air compressor device (14) and a dedicated air compressor device (15). The vehicle air compressor device (14) and the dedicated air compressor device (15) are connected to the first switching valve (3). The first switching valve (3) is used to switch the vehicle air compressor device (14) and the dedicated air compressor device (15) as needed; the air conditioning system (16) includes a compressed air oil content regulating system (17) and an air heating and humidifying system (18). The outlet end of the air source treatment module (1) is connected to the compressed air oil content regulating system (17). The compressed air oil content regulating system includes an oil adding system (80) and an oil content monitoring device (81). The oil content monitoring device is connected to the controller. The oil adding system (80) includes an oil storage tank. A pressurizing piston is arranged in the oil storage tank. The oil outlet of the oil storage tank is connected to an atomizing nozzle through a pipeline. The oil outlet end of the atomizing nozzle is connected to a mixing chamber. The outlet end of the air source treatment module (1) is communicated with the mixing chamber; it further includes a measurement and control system. The measurement and control system includes a PLC controller (24) and a humidity sensor (25), a temperature sensor (26), a dew point meter (70) and a pressure sensor (71) connected to the PLC controller (24); It further includes an output measurement loop. The output measurement loop includes a drying efficiency measurement loop (28) and an oil / water content measurement loop (29). The drying efficiency measurement loop (28) is composed of an air storage tank (6), a variable air capacitance (30), a flow sensor (31), a load ratio regulating valve, a temperature sensor (26), and a humidity sensor (25); the oil / water content measurement loop (29) is used for the separation efficiency and oil content detection of the condenser (36), and includes an oil content detection system (32), a water filter, a liquid water collector (33) and a load regulating device; The detection method is realized through the following steps: Step 1: Connect the air conditioning system (16) and the air source treatment module (1) in an air path; Step 2: Connect the inlet end of the dryer (35) to the air conditioning system (16) in an air path, and connect the outlet end to the output measurement loop in an air path; Step 3. Measurement of differential pressure at the air inlet: Close the air heating and humidifying system (18), adjust the inlet air flow through the proportional flow valve, and then measure the pressures at the inlet and outlet of the dryer (35) to measure the differential pressure between the inlet and outlet. Step 3. Flow test of the dryer (35): Repeat Step 2. Close the air heating and humidifying system (18). Connect the outlet of the dryer (35) to the atmosphere. Adjust the inlet air pressure through the proportional flow valve and measure the air source flow at the inlet. Step 4. Detection of the drying capacity of the dryer (35): Repeat Step 2. Adjust the gas source input flow and pressure to meet the detection standard. Turn on the air heating and humidifying system (18). Detect the current temperature and humidity signals through the temperature sensor (26) and humidity sensor (25). The controller collects the above signals to perform closed-loop control on the heating and humidifying system to make the air meet the temperature and humidity requirements. By controlling the on / off of the pressure relief solenoid valve, pressurization and pressure relief of the dryer (35) are achieved, so that the outlet pressure undergoes a periodic cycle until the dew point temperature of the air in the air storage cylinder connected to the outlet reaches stability; record the volume of the air storage cylinder and the dew point drop of the air in the air storage cylinder of the test system at this time. During the test, the pressure relief time should be greater than twice the pressurization time, that is, the load rate is less than 33%. Adjust the load rate by adjusting the pressure relief and pressure regulating valve. Increase the volume of the air storage cylinder through the variable air capacitance (30) and continue the test until the dew point of the air in the air storage cylinder is lower than 17°C. Calculate the volume of air processed in one cycle when the dew point drop of the air in the air storage cylinder is 17°C. This volume is the drying volume and drying capacity of the air dryer (35). Step 5. Detection of the backup capacity of the dryer (35): Continue to increase the volume of the air storage cylinder for the test until the dew point of the air in the air storage cylinder is lower than 5°C; calculate the volume of air processed in one cycle when the dew point drop of the air in the air storage cylinder is 5°C. The volume obtained by subtracting the drying volume measured for the drying capacity and drying efficiency from this volume is the backup capacity of the air dryer (35). Step 6. Recovery of the dryer (35): Adjust the volume of the air storage cylinder to the theoretical drying volume, that is, the drying volume calculated in the design, and continue the cyclic test until the dew point drop (DPD22) of the air in the air storage cylinder reaches 14°C; record the number of cycles when the dew point drop of the air in the air storage cylinder changes from 5°C to 14°C. It also includes water separation efficiency detection and oil separation efficiency detection. The water separation efficiency detection includes the following steps: Step 7. Connect the inlet end of the condenser (36) to the air circuit of the air conditioning system (16), and the outlet end to the air circuit of the output measurement circuit. Step 8. Adjust the flow rate, humidity, and pressure of the compressed air to the set values according to the actual vehicle parameters. After a period of time, collect the volume of the liquid water at the drainage port of the condenser (36) and the water filter drainage port, and calculate the water separation efficiency of the condenser (36). Step 9. Adjust the compressed air flow rate, humidity, pressure, and oil content in the gas to the set values according to the actual vehicle parameters. After a period of time, measure the values of the oil content sensors at the inlet and outlet of the condenser (36) and calculate the oil removal efficiency. Step Ten: Adjust the compressed air flow rate, humidity, pressure, and temperature to the set values according to the actual vehicle parameters, adjust the output load. After a period of time, collect the drainage from the drain outlets of the condenser (36) and the water filter, measure the compressed air temperature at the inlet and outlet of the condenser (36), and calculate the temperature difference at the outlet.

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