Nitrogen-oxygen sensor testing system

Abstract

The invention discloses a nitrogen-oxygen sensor testing system in the field of sensor testing, which comprises a carbon monoxide storage bottle, a carbon dioxide storage bottle, a nitrogen storage bottle and an oxygen storage bottle which are arranged side by side, and the upper parts of the carbon monoxide storage bottle, the carbon dioxide storage bottle and the nitrogen storage bottle are connected with stop valves through pipelines. The four gas storage bottles, namely the carbon monoxide storage bottle, the carbon dioxide storage bottle, the nitrogen storage bottle and the oxygen storage bottle, are arranged, so that the introduction amount of NO, N02, N2 and 02 can be accurately controlled through the stop valves and the mass flow meters; n2 gas can be used as comprehensive gas to regulate the concentration of the gas so as to enable the concentration of the tested gas to reach a required value, and a proper amount of water vapor is introduced by heating the water storage bottle through the heater, so that the automobile exhaust environment can be better simulated, and the test precision of the nitrogen-oxygen sensor is greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of sensor testing, and specifically to a nitrogen oxide sensor testing system. Background Art

[0002] Nitrogen oxide sensors play a crucial role in fields such as automotive exhaust emission monitoring and industrial waste gas detection. Their measurement accuracy and reliability directly affect the implementation of environmental protection standards and the normal operation of related equipment. Currently, there are many problems in existing nitrogen oxide sensor testing systems: 1. Single test environment: Most test systems can only simulate simple gas environments and are difficult to truly reproduce complex and changeable actual working conditions. For example, they cannot simultaneously simulate different temperatures, humidities, and the interference of multiple gas components, resulting in a large deviation between the test results and the actual use scenario and being unable to comprehensively evaluate the sensor performance.

[0003] 2. Difficult precision calibration: There is a lack of precise and efficient calibration methods and equipment, and the calibration process is cumbersome and has large errors. Traditional calibration methods often rely on manual operation and empirical judgment, and the calibration results of different operators vary significantly, unable to ensure high-precision measurement of the sensor within the full range.

[0004] 3. The installation structure of the sensor to be tested is relatively complex, and it is time-consuming and laborious to replace different sensors for testing.

[0005] Therefore, those skilled in the art have provided a nitrogen oxide sensor testing system to solve the problems raised in the above background art. Summary of the Invention

[0006] The purpose of the present invention is to provide a nitrogen oxide sensor testing system to solve the problems raised in the above background art.

[0007] To achieve the above purpose, the present invention provides the following technical solutions: A nitrogen oxide sensor test system includes a carbon monoxide storage bottle, a carbon dioxide storage bottle, a nitrogen storage bottle, and an oxygen storage bottle. The carbon monoxide storage bottle, the carbon dioxide storage bottle, the nitrogen storage bottle, and the oxygen storage bottle are arranged side by side. Cut-off valves are connected above the carbon monoxide storage bottle, the carbon dioxide storage bottle, and the nitrogen storage bottle through pipelines. Two cut-off valves are connected to the oxygen storage bottle through a tee. Mass flow meters are connected to the cut-off valves above the carbon monoxide storage bottle, the carbon dioxide storage bottle, the nitrogen storage bottle, and the oxygen storage bottle through pipelines. The mass flow meters on the carbon monoxide storage bottle, the carbon dioxide storage bottle, and the nitrogen storage bottle, and one of the mass flow meters on the oxygen storage bottle are connected in a converging manner through pipelines above to a gas mixing chamber. A mixing valve is connected to the gas mixing chamber through a pipeline. The other mass flow meter on the oxygen storage bottle is connected to a water storage bottle through a pipeline. The water storage bottle is connected to the mixing valve through a pipeline above. A heater for heating the water inside the water storage bottle is arranged around the bottom of the water storage bottle; The mixing valve is connected to a detection test bottle through a pipeline. A tubular electric furnace is arranged around the detection test bottle. A nitrogen oxide sensor to be tested and a standard nitrogen oxide sensor are arranged on one side of the side wall of the detection test bottle. The nitrogen oxide sensor to be tested and the standard nitrogen oxide sensor are connected to a sensor controller through a CAN communication line. The sensor controller is connected to an SCR system controller through a CAN communication line. The SCR system controller is connected to a computer through a LIN communication line.

[0008] As a further solution of the present invention: The end of the detection test bottle is connected to two cut-off valves through a tee pipeline. One of the cut-off valves connected to the detection test bottle is connected to an exhaust gas purification treatment device through a pipeline. The other cut-off valve connected to the detection test bottle is connected to a vacuum generator through a pipeline.

[0009] As a further solution of the present invention: A humidity sensor, a temperature sensor, and an exhaust gas detector are sequentially and hermetically installed on the other side of the side wall of the detection test bottle. The humidity sensor, the temperature sensor, and the exhaust gas detector are connected to the sensor controller through a CAN communication line.

[0010] As a further solution of the present invention: It further includes a clamping platform fixedly installed on the detection test bottle on the side of the nitrogen oxide sensor to be detected. A through hole communicating with the inside of the detection test bottle is opened on the clamping platform. A sealing groove is opened around the through hole above the clamping platform. A sealing ring is glued inside the sealing groove. The nitrogen oxide sensor to be tested is arranged on the sealing ring.

[0011] As a further solution of the present invention: an airtight door support frame is fixedly connected above the clamping table, a locking air cylinder is fixedly connected to the top of the gantry support frame, the telescopic end of the locking air cylinder passes through the gantry support frame and is fixedly connected with a U-shaped pressing head, and an elastic pad is glued to the bottom of the U-shaped pressing head.

[0012] As a further solution of the present invention: the outer shape of the sealing groove matches the structure of the mounting head of the nitrogen oxide sensor to be tested, and the detection head of the nitrogen oxide sensor to be tested is inserted into the through hole.

[0013] As a further solution of the present invention: the nitrogen oxide sensor to be tested is connected to the CAN communication line through a quick connector.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By setting four gas storage bottles, namely a carbon monoxide storage bottle, a carbon dioxide storage bottle, a nitrogen storage bottle and an oxygen storage bottle, the present invention can accurately control the input amounts of NO, N0 2 , N 2 and 0 2 through the stop valve and the mass flowmeter. Furthermore, when mixing gas, N 2 gas can be used as a comprehensive gas to adjust the concentration of the gas so that the concentration of the test gas reaches the required value. Moreover, by appropriately heating the water storage bottle through a heater, some water vapor is introduced, which can better simulate the automobile exhaust environment, greatly improving the test accuracy of the nitrogen oxide sensor. In addition, by setting a standard nitrogen oxide sensor for real-time data calibration, it is convenient to efficiently and quickly fit and correct the output signal of the sensor, ensuring the measurement error of the sensor within the full range.

[0015] 2. The present invention can actuate the locking air cylinder, that is, the nitrogen oxide sensor to be tested can be tightly pressed and fixed on the sealing pad through the U-shaped pressing head, greatly improving the installation and disassembly and replacement efficiency. Furthermore, when testing different nitrogen oxide sensors, it is convenient to replace, improving the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the system diagram of the present invention; Figure 2 is the Figure 1 partial enlarged view at A in the present invention; Figure 3 is the cross-sectional view of the connection part between the detection test bottle and the nitrogen oxide sensor to be tested in the present invention; Figure 4 is the bottom view structure diagram of the U-shaped pressing head in the present invention; Figure 5 is the interface diagram of the SCR system controller in the present invention.

[0017] In the figure: 1, carbon monoxide storage bottle; 2, carbon dioxide storage bottle; 3, nitrogen storage bottle; 4, oxygen storage bottle; 5, stop valve; 6, mass flowmeter; 7, gas mixing chamber; 8, mixing valve; 9, water storage bottle; 10, heater; 11, detection and test bottle; 12, tubular electric furnace; 13, exhaust gas purification and treatment equipment; 14, vacuum generator; 15, sensor controller; 16, SCR system controller; 17, computer; 18, nitrogen-oxygen sensor to be tested; 19, standard nitrogen-oxygen sensor; 20, exhaust gas detector; 21, temperature sensor; 22, humidity sensor; 23, gantry support frame; 24, locking cylinder; 25, U-shaped pressure head; 26, elastic pad; 27, clamping platform; 28, sealing groove; 29, sealing ring; 30, through hole. Detailed implementation mode

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] Please refer to Figures 1 to 4 , in the embodiment of the present invention, a nitrogen-oxygen sensor test system includes a carbon monoxide storage bottle 1, a carbon dioxide storage bottle 2, a nitrogen storage bottle 3 and an oxygen storage bottle 4. The carbon monoxide storage bottle 1, the carbon dioxide storage bottle 2, the nitrogen storage bottle 3 and the oxygen storage bottle 4 are arranged side by side. A stop valve 5 is connected above the carbon monoxide storage bottle 1, the carbon dioxide storage bottle 2 and the nitrogen storage bottle 3 through pipelines. Two stop valves 5 are connected to the oxygen storage bottle 4 through a tee. A mass flowmeter 6 is connected to the stop valves 5 above the carbon monoxide storage bottle 1, the carbon dioxide storage bottle 2, the nitrogen storage bottle 3 and the oxygen storage bottle 4 through pipelines. The mass flowmeters 6 on the carbon monoxide storage bottle 1, the carbon dioxide storage bottle 2 and the nitrogen storage bottle 3 and one of the mass flowmeters 6 on the oxygen storage bottle 4 are connected to a gas mixing chamber 7 through pipelines in a converging manner. A mixing valve 8 is connected to the gas mixing chamber 7 through a pipeline. Another mass flowmeter 6 on the oxygen storage bottle 4 is connected to a water storage bottle 9 through a pipeline. The water storage bottle 9 is connected to the mixing valve 8 through a pipeline above it. A heater 10 for heating the water inside the water storage bottle 9 is arranged on the outer periphery of the bottom of the water storage bottle 9; A detection and test bottle 11 is connected to the mixing valve 8 through a pipeline. A tubular electric furnace 12 is arranged around the detection and test bottle 11. A nitrogen-oxygen sensor 18 to be tested and a standard nitrogen-oxygen sensor 19 are arranged on one side of the side wall of the detection and test bottle 11. The nitrogen-oxygen sensor 18 to be tested and the standard nitrogen-oxygen sensor 19 are connected to a sensor controller 15 through a CAN communication line. The sensor controller 15 is connected to an SCR system controller 16 through a CAN communication line. The SCR system controller 16 is connected to a computer 17 through a LIN communication line.

[0020] By adopting the above technical solution, by providing four gas storage bottles, namely a carbon monoxide storage bottle 1, a carbon dioxide storage bottle 2, a nitrogen storage bottle 3 and an oxygen storage bottle 4, the inflow of NO, N0 2 , N 2 and O 2 can be accurately controlled through the stop valve 5 and the mass flowmeter 6. When the nitrogen-oxygen sensor detects the tail gas, the main gases involved are NO, N0 2 and O 2 . Among them, NO and N0 2 are the quantities to be detected by the nitrogen-oxygen sensor, and O 2 is the factor that has the greatest impact on the test accuracy during the entire test process. Its oxidizing property can, to a certain extent, inhibit the decomposition of nitrogen oxides. When testing the performance of the nitrogen-oxygen sensor in this application, the quantity of O 2 can be conveniently and quickly adjusted, thereby reducing the influence of O 2 during the test process. When preparing the gas mixture, N 2 gas can be used as a comprehensive gas to adjust the concentration of the gas so that the concentration of the test gas reaches the required value. Moreover, by appropriately heating the water storage bottle 9 through the heater 10, some water vapor is introduced, which can better simulate the automobile tail gas environment, greatly improving the test accuracy of the nitrogen-oxygen sensor. And by providing a standard nitrogen-oxygen sensor 19 for real-time data calibration, it is convenient to efficiently and quickly fit and correct the output signal of the sensor, ensuring the measurement error of the sensor within the full range.

[0021] Among them, the end of the detection and test bottle 11 is connected to two stop valves 5 through a tee pipeline. One of the stop valves 5 connected to the detection and test bottle 11 is connected to an exhaust gas purification and treatment device 13 through a pipeline. The other stop valve 5 connected to the detection and test bottle 11 is connected to a vacuum generator 14 through a pipeline. The exhaust gas purification and treatment device 13 can purify the discharged gas to avoid environmental pollution.

[0022] Among them, a humidity sensor 22, a temperature sensor 21, and an exhaust gas detector 20 are sequentially and hermetically installed on the other side of the side wall of the detection test bottle 11. The humidity sensor 22, the temperature sensor 21, and the exhaust gas detector 20 are connected to the sensor controller 15 through a CAN communication line. The humidity sensor 22, the temperature sensor 21, and the exhaust gas detector 20 can sequentially detect the humidity, temperature, and exhaust gas of the gas inside the detection test bottle 11, facilitating the real-time grasp of the temperature and humidity conditions of the detected gas, so as to better simulate the temperature and humidity state of automobile exhaust gas.

[0023] Among them, it also includes a clamping table 27 fixedly installed on the detection test bottle 11 on the side of the nitrogen oxide sensor to be detected. A through hole 30 communicating with the inside of the detection test bottle 11 is provided on the clamping table 27. A sealing groove 28 is provided around the through hole 30 above the clamping table 27. A sealing ring 29 is adhesively bonded inside the sealing groove 28. The nitrogen oxide sensor 18 to be tested is arranged on the sealing ring 29. A gantry support frame is fixedly connected above the clamping table 27. A locking cylinder 24 is fixedly connected to the top of the gantry support frame 23. The telescopic end of the locking cylinder 24 passes through the gantry support frame 23 and is fixedly connected to a U-shaped pressing head 25. An elastic pad 26 is adhesively bonded to the bottom of the U-shaped pressing head 25.

[0024] By adopting the above technical solution, the locking cylinder 24 can act, that is, the nitrogen oxide sensor 18 to be tested can be tightly pressed and fixed on the sealing pad through the U-shaped pressing head 25, greatly improving the installation and disassembly and replacement efficiency. Furthermore, when testing different nitrogen oxide sensors, it is convenient to replace, improving the testing efficiency.

[0025] Among them, the outer shape of the sealing groove 28 matches the structure of the installation head of the nitrogen oxide sensor 18 to be tested, and the detection head of the nitrogen oxide sensor 18 to be tested is inserted into the through hole 30. The nitrogen oxide sensor 18 to be tested is connected to the CAN communication line through a quick connector.

[0026] In this embodiment, as Figure 5 shown, the working condition of the nitrogen oxide sensor can be understood at all times through the control interface of the SCR system controller 16. When the nitrogen oxide sensor goes from the cooling state to the normal working state, the current in its circuit will continuously rise with time. When the current value stabilizes at about 0.5 A, it indicates that the nitrogen oxide sensor has entered the normal working state.

[0027] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent replacements or changes, and should be covered by the protection scope of the present invention.

Claims

1. A nitrogen oxygen sensor test system, comprising a carbon monoxide storage bottle (1), a carbon dioxide storage bottle (2), a nitrogen storage bottle (3) and an oxygen storage bottle (4), characterized in that: The carbon monoxide storage bottle (1), the carbon dioxide storage bottle (2), the nitrogen storage bottle (3) and the oxygen storage bottle (4) are arranged side by side, and the carbon monoxide storage bottle (1), the carbon dioxide storage bottle (2) and the nitrogen storage bottle (3) are connected to a stop valve (5) via a pipeline, and the oxygen storage bottle (4) is connected to two stop valves (5) via a three-way connection, and the stop valves (5) above the carbon monoxide storage bottle (1), the carbon dioxide storage bottle (2), the nitrogen storage bottle (3) and the oxygen storage bottle (4) are connected to a mass flow meter (6) via a pipeline, and the carbon monoxide storage bottle (1) ), the mass flow meters (6) on the carbon dioxide storage bottle (2) and the nitrogen storage bottle (3), and one of the mass flow meters (6) on the oxygen storage bottle (4) are connected to a gas mixing chamber (7) via a pipeline, the gas mixing chamber (7) is connected to a mixing valve (8) via a pipeline, the other mass flow meter (6) on the oxygen storage bottle (4) is connected to a water storage bottle (9) via a pipeline, the water storage bottle (9) is connected to the mixing valve (8) via a pipeline, and a heater (10) for heating water inside the water storage bottle (9) is arranged on the periphery of the bottom of the water storage bottle (9); The mixing valve (8) is connected to a detection test bottle (11) via a pipeline, a tubular electric furnace (12) is arranged on the periphery of the detection test bottle (11), a nitrogen oxygen sensor to be tested (18) and a standard nitrogen oxygen sensor (19) are arranged on one side of a side wall of the detection test bottle (11), the nitrogen oxygen sensor to be tested (18) and the standard nitrogen oxygen sensor (19) are connected to a sensor controller (15) via a CAN communication line, the sensor controller (15) is connected to an SCR system controller (16) via a CAN communication line, and the SCR system controller (16) is connected to a computer (17) via a LIN communication line.

2. A nitrogen oxygen sensor testing system according to claim 1, characterized in that: The end of the detection test bottle (11) is connected to two stop valves (5) via a three-way pipeline, and one of the stop valves (5) connected to the detection test bottle (11) is connected to an exhaust gas purification treatment device (13) via a pipeline, and the other stop valve (5) connected to the detection test bottle (11) is connected to a vacuum generator (14) via a pipeline.

3. A nitrogen oxygen sensor testing system according to claim 1, characterized in that: A humidity sensor (22), a temperature sensor (21) and an exhaust gas detector (20) are sequentially sealed and installed on the other side of the side wall of the detection test bottle (11), and the humidity sensor (22), the temperature sensor (21) and the exhaust gas detector (20) are connected to the sensor controller (15) via a CAN communication line.

4. A nitrogen oxygen sensor testing system according to claim 1, characterized in that: It also includes a card stand (27) fixedly mounted on the detection test bottle (11) and located on one side of the nitrogen oxygen sensor to be tested, the card stand (27) is provided with a through hole (30) communicating with the interior of the detection test bottle (11), a sealing groove (28) is provided above the card stand (27) and located on the periphery of the through hole (30), a sealing ring (29) is glued inside the sealing groove (28), and the nitrogen oxygen sensor (18) to be tested is arranged on the sealing ring (29).

5. A nitrogen oxygen sensor testing system according to claim 4, characterized in that: An empty door closing support frame is fixedly connected above the card platform (27), a locking cylinder (24) is fixedly connected to the top of the gantry support frame (23), a telescopic end of the locking cylinder (24) passes through the gantry support frame (23) and is fixedly connected to a U-shaped pressure head (25), and an elastic pad (26) is glued to the bottom of the U-shaped pressure head (25).

6. A nitrogen oxygen sensor testing system according to claim 5, characterized in that: The outer shape of the sealing groove (28) matches the mounting head structure of the nitrogen oxygen sensor (18) to be tested, and the detection head of the nitrogen oxygen sensor (18) to be tested is inserted into the through hole (30).

7. A nitrogen oxygen sensor testing system according to claim 1, characterized in that: The nitrogen oxygen sensor (18) to be tested is connected to the CAN communication line via a quick-plug connector.

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