Test system for low-temperature and low-pressure cold start of cabin type diesel vehicle

Abstract

The utility model provides a cabin type diesel vehicle low-temperature low-pressure cold start test system, which comprises a test cabin, an air supply device, a refrigeration dehumidifier, a heating humidifier, a vacuum pump and a gas preheating device, and is characterized in that the test cabin is used for accommodating a tested diesel vehicle; the air supply device is connected with the test cabin through a first pipeline; the refrigeration dehumidifier and the heating humidifier are both connected with the test cabin; the vacuum pump is connected with the test cabin through a second pipeline; the gas preheating device is arranged on the second pipeline and used for heating gas in the second pipeline; according to the application, the refrigeration dehumidifier, the air supply device and the vacuum pump are combined and applied, and the test temperature and the test air pressure in the test chamber can be adjusted, so that a stable low-temperature and low-pressure environment is formed in the test chamber, the interference of the tested diesel vehicle on the test environment in the test chamber in the starting and running processes is reduced, and the test efficiency is improved. And the device is more suitable for a low-temperature and low-pressure environment of a real plateau region, so that the accuracy of a test result is improved.

Description

Technical Field

[0001] The present application relates to the technical field of diesel vehicle testing, and in particular to a low-temperature and low-pressure cold start test system for cabin-type diesel vehicles. Background Art

[0002] my country has a vast territory with complex and diverse topography, mainly dominated by mountains and plateaus. Plateaus account for about one-third of the country's land area and have significant climatic characteristics such as cold weather, large temperature difference between day and night, low ambient air pressure, low air density and low oxygen content. In view of the special climatic characteristics, higher performance requirements are placed on vehicles used in low temperature and low pressure environments. Therefore, in order to ensure that diesel vehicles can start and run smoothly in plateau areas, the performance of diesel vehicles needs to be specially designed and optimized to cope with the unique climate challenges of plateau areas, ensure the reliability and operating efficiency of diesel vehicles, and enable diesel vehicles to maintain a stable working state in harsh environments.

[0003] In the related technology, the low-temperature and low-pressure cold start test is used to simulate the cold start and operation of diesel vehicles in a low-temperature and low-pressure environment. It is an important detection method to evaluate the adaptability of diesel vehicles in plateau areas, and it is also an effective method to evaluate the cold start performance of diesel vehicles in the low-pressure and high-cold environment of the plateau; however, due to seasonal and geographical restrictions, when implementing the low-temperature and low-pressure cold start test, it is necessary to build a simulation test platform in the test site to reproduce the extreme environment of low temperature and low pressure in the plateau area; when conducting the low-temperature and low-pressure cold start test, since the diesel vehicle under test will affect the temperature and air pressure in the test cabin during the starting and operation process, it is easy to interfere with the low-temperature and low-pressure environment formed in the test cabin, and it is difficult to maintain the stability and balance of the low-temperature and low-pressure environment in the test cabin, thereby reducing the accuracy of the test results. Utility Model Content

[0004] In view of this, the purpose of the present application is to propose a low-temperature and low-pressure cold start test system for cabin-type diesel vehicles to solve some or all of the technical problems mentioned above.

[0005] Based on the above purpose, the present application provides a test system for low-temperature and low-pressure cold start of a cabin-type diesel vehicle, including a test cabin, an air supply device, a refrigeration dehumidifier, a heating humidifier, a vacuum pump and a gas preheating device, wherein the test cabin is used to accommodate the diesel vehicle under test;

[0006] The air supply device is connected to the test cabin through a first pipeline, and is used to provide gas to the test cabin; the refrigeration dehumidifier and the heating humidifier are both connected to the test cabin, and the refrigeration dehumidifier is used to adjust the temperature and humidity in the test cabin to a preset test range; the vacuum pump is connected to the test cabin through a second pipeline, and is used to extract and exhaust the gas in the test cabin; the gas preheating device is arranged in the second pipeline, and is used to heat the gas in the second pipeline.

[0007] From the above, it can be seen that the low-temperature and low-pressure cold start test system for cabin-type diesel vehicles provided in the present application can adjust the test temperature and test air pressure in the test cabin by combining the use of a refrigeration dehumidifier, an air supply device and an air supply device, so as to form a relatively stable low-temperature and low-pressure environment in the test cabin, reduce the interference of the tested diesel vehicle to the low-temperature and low-pressure environment during the starting and operation process, and make it more in line with the low-temperature and low-pressure environment of the actual plateau area, thereby improving the accuracy of the test results of the low-temperature and low-pressure cold start test. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0009] Figure 1 This is a schematic diagram of the structure of the test system for low-temperature and low-pressure cold start of a mid-cabin diesel vehicle in this application;

[0010] Figure 2 This is a block diagram of the electrical connection between the measurement and control unit and the temperature and humidity sensor, the pressure sensor, and the diesel vehicle under test in this application;

[0011] Figure 3 It is a block diagram of electrical connections between the computer and the gas replenishing device, the refrigeration dehumidifier, the heating humidifier, the gas preheating device, the gas refrigeration device, the vacuum pump and the gas regulating valve in this application;

[0012] Figure 4 This is a flowchart of the test method for low-temperature and low-pressure cold start of a mid-cabin diesel vehicle in this application.

[0013] Description of reference numerals:

[0014] 1. Test chamber; 101. Tested diesel vehicle; 2. Air supply device; 3. Refrigeration dehumidifier; 4. Heating humidifier; 5. Vacuum pump; 6. Gas preheating device; 7. First pipeline; 8. Second pipeline; 9. Third pipeline; 10. Exhaust gas pressure stabilizing device; 11. Gas regulating valve; 12. Gas filter; 13. Gas precooling device; 14. Measurement and control unit; 1401. Computer; 1402. Data acquisition box; 1403. Control panel; 1404. Relay box; 1405. Junction box; 15. Temperature and humidity sensor; 16. Pressure sensor. DETAILED DESCRIPTION

[0015] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0016] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0017] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0018] In the related art, the low-temperature and low-pressure cold start test is used to simulate the cold start and operation of diesel vehicles in a low-temperature and low-pressure environment. It is an important detection method for evaluating the adaptability of diesel vehicles in plateau areas, and it is also an effective method to evaluate the cold start performance of diesel vehicles in plateau low-pressure and high-cold environments. However, due to seasonal and regional restrictions, when implementing the low-temperature and low-pressure cold start test, it is necessary to build a simulation test platform in the test site to reproduce the extreme environment of low temperature and low pressure in the plateau area. When conducting the low-temperature and low-pressure cold start test, on the one hand, since the diesel vehicle under test will affect the test temperature and test air pressure in the test cabin during the starting and running process, it is easy to interfere with the low-temperature and low-pressure environment formed in the test cabin, and it is difficult to maintain the stability and balance of the low-temperature and low-pressure environment in the test cabin, thereby reducing the accuracy of the test results; on the other hand, when conducting the low-temperature and low-pressure cold start test, the test personnel need to start the vehicle in the test cabin and need to change the operating state of the diesel vehicle under test. Since the human body has limited tolerance to the high-cold and low-pressure environment, the low-temperature and low-pressure environment in the test cabin may cause safety accidents such as frostbite or hypoxia to the test personnel, thereby bringing greater safety hazards to the test.

[0019] In view of this, the present application provides a test system for low-temperature and low-pressure cold start of a cabin-type diesel vehicle, including a test cabin 1, an air supply device 2, a refrigeration dehumidifier 3, a heating humidifier 4, a vacuum pump 5 and a gas preheating device 6, wherein the test cabin 1 is used to accommodate the diesel vehicle 101 under test; the air supply device 2 is connected to the test cabin 1 through a first pipeline 7, and is used to provide gas to the test cabin 1; the refrigeration dehumidifier 3 and the heating humidifier 4 are both connected to the test cabin 1, and the refrigeration dehumidifier 3 is used to adjust the temperature and humidity in the test cabin 1 to a preset test range; the vacuum pump 5 is connected to the test cabin 1 through a second pipeline 8, and is used to extract the gas in the test cabin 1; the gas preheating device 6 is arranged in the second pipeline 8, and is used to heat the gas in the second pipeline 8.

[0020] like Figure 1-Figure 3As shown, the present application provides a test system for low-temperature and low-pressure cold start of a cabin-type diesel vehicle, which is used to simulate the low-temperature and low-pressure environment in plateau areas, so as to carry out low-temperature and low-pressure cold start tests on diesel vehicles, so as to check the adaptability of the tested diesel vehicle 101 to the low-temperature and low-pressure environment; wherein, the test system includes a test cabin 1, an air supply device 2, a refrigeration and dehumidifier 3 and a vacuum pump 5, wherein the refrigeration and dehumidifier 3 is connected to the test cabin 1, and the refrigeration and dehumidifier 3 can be used to cool the interior of the test cabin 1 to form a low-temperature test environment in the test cabin 1, and maintain the dynamic balance of the low-temperature environment in the test cabin 1, so as to make it closer to the real low-temperature environment in plateau areas; at the same time, the refrigeration and dehumidifier 3 can also be used to remove water vapor in the test cabin 1, so as to avoid the condensation of water vapor in the test cabin 1 and interfere with the low-temperature and low-pressure cold start test, and also reduce the after-test The difficulty of cleaning the inside of the test chamber 1 and the diesel vehicle 101 under test; during the test, since the diesel vehicle 101 under test needs to consume the gas in the test chamber 1 during cold start and operation, by applying the air supply device 2 in the test system and connecting the air supply device 2 to the test chamber 1 through the first pipeline 7, it is possible to continuously supply gas to the test chamber 1 to maintain the stability of the air pressure in the test chamber 1 and ensure the stability and balance of the low-temperature and low-pressure environment in the test chamber 1; in addition, when it is necessary to change the test environment in the test chamber 1, such as constructing a low-temperature and low-pressure test environment in the test chamber 1, or when it is necessary to reduce the test air pressure in the test chamber 1, the vacuum pump 5 and the second pipeline 8 can be used to exhaust the gas in the test chamber 1, thereby quickly reducing the test air pressure in the test chamber 1 and improving the efficiency of regulating the test air pressure in the test chamber 1.

[0021] Since the temperature in the test chamber 1 is relatively low, when the vacuum pump 5 and the second pipeline 8 are used to pump out the gas, the temperature of the vacuum pump 5 will drop rapidly and liquefaction will easily occur, affecting the vacuum degree and mechanical properties of the vacuum pump 5 and reducing the pumping efficiency of the vacuum pump 5; therefore, a gas preheating device 6 is provided through the second pipeline 8 to heat the gas and increase the gas temperature in the second pipeline 8, so that the vacuum pump 5 can operate stably to ensure the pumping efficiency of the vacuum pump 5.

[0022] In addition, the test system also includes a heating and humidifying machine 4, and the heating and humidifying machine 4 is connected to the test cabin 1; when the low-temperature and low-pressure cold start test is completed, the door of the test cabin 1 may be frozen in the low-temperature and low-pressure environment, making it difficult for test personnel to enter and exit the test cabin 1 to operate. In order to quickly adjust the low-temperature and low-pressure environment in the test cabin 1 and improve the working conditions of the test personnel, the heating and humidifying machine 4 can be used to heat and humidify the inside of the test cabin 1, reduce the difference in the environment inside and outside the test cabin 1, so that after opening the test cabin 1, the test personnel can normally enter the test cabin 1 to work, and avoid the occurrence of safety accidents such as frostbite.

[0023] In some embodiments, the exhaust pipe of the diesel vehicle 101 under test is connected to the third pipeline 9, the third pipeline 9 extends to the outside of the test chamber 1, and the second pipeline 8 between the gas preheating device 6 and the vacuum pump 5 is connected to the gas outlet end of the third pipeline 9; an exhaust gas pressure stabilizing device 10 is provided on the third pipeline 9, and the exhaust gas pressure stabilizing device 10 is located outside the test chamber 1.

[0024] like Figure 1 As shown, the air inlet end of the third pipeline 9 is connected to the exhaust pipe of the diesel vehicle 101 under test in the test chamber 1, and extends to the outside of the test chamber 1 through the third pipeline 9, and the air outlet end of the third pipeline 9 is connected to the second pipeline 8 between the gas preheating device 6 and the vacuum pump 5, so that the exhaust gas generated by the diesel vehicle 101 under test is transported to the second pipeline 8 through the third pipeline 9, and then discharged to the outside of the test chamber 1 through the second pipeline 8 and the vacuum pump 5, so as to avoid the exhaust gas generated by the diesel vehicle 101 under test from damaging the test environment in the test chamber 1; at the same time, the air outlet end of the third pipeline 9 is connected to the exhaust pipeline, so that the test chamber 1 and the diesel vehicle 101 under test are connected. Sharing the same vacuum pump 5 simplifies the overall structure of the test system, reduces the production cost of the test system, and can discharge the exhaust gas generated by the tested diesel vehicle 101 in time; in addition, since the exhaust gas generated by the tested diesel vehicle 101 has a relatively high pressure and there is a certain pressure difference with the gas in the second pipeline 8, it is difficult for the exhaust gas to be smoothly discharged into the second pipeline 8; by arranging an exhaust gas pressure stabilizing device 10 in the third pipeline 9, the air pressure in the third pipeline 9 can be reduced, so that the air pressure in the third pipeline 9 is close to the air pressure in the second pipeline 8, so that the vacuum pump 5 can exhaust the gas in the test chamber 1 and the exhaust gas of the tested diesel vehicle 101 to the outside together.

[0025] In some embodiments, the second pipeline 8 is provided with a gas regulating valve 11, which is located between the gas outlet end of the third pipeline 9 and the vacuum pump 5 and is used to regulate the gas flow into the vacuum pump 5; Figure 1 As shown, during the test, since the test air pressure in the test chamber 1 needs to be adjusted in real time to ensure that the diesel vehicle 101 under test continues to generate exhaust gas, the vacuum pump 5 needs to continue to maintain an operating state; by providing a gas regulating valve 11 between the outlet end of the third pipeline 9 and the vacuum pump 5, the gas flow discharged from the test system can be adjusted, the exhaust pressure of the second pipeline 8 can be stabilized, and the stability of the operation of the vacuum pump 5 can be ensured.

[0026] In some embodiments, the third pipeline 9 is further provided with a gas filter 12 for filtering the exhaust gas of the diesel vehicle 101 under test. The gas filter 12 is located outside the test chamber 1 and is arranged between the diesel vehicle 101 under test and the exhaust gas pressure stabilizing device 10 .

[0027] like Figure 1As shown, when performing a low-temperature and low-pressure cold start, it is necessary to control the start and operation of the diesel vehicle 101 under test in the test chamber 1, wherein the exhaust gas generated by the diesel vehicle 101 under test contains water vapor and smoke particles. When the exhaust gas is extracted by the vacuum pump 5, the water vapor and smoke particles pass through the vacuum pump 5 and easily cause the vacuum pump 5 to be blocked, affecting the smoothness of the gas extraction in the second pipeline 8; by providing a gas filter 12 in the third pipeline 9, and providing the gas filter 12 between the diesel vehicle 101 under test and the exhaust gas pressure stabilizing device 10, the exhaust gas in the third pipeline 9 can be filtered and adsorbed, so as to remove impurities such as moisture and smoke particles in time before the exhaust gas enters the second pipeline 8, thereby ensuring that the vacuum pump 5 can operate stably.

[0028] In some embodiments, the third pipeline 9 is further provided with a gas precooling device 13 for cooling the exhaust gas of the diesel vehicle 101 under test. The gas precooling device 13 is located outside the test chamber 1 and is arranged between the diesel vehicle 101 under test and the gas filter 12 .

[0029] like Figure 1 As shown, during the low-temperature and low-pressure cold start test, the exhaust gas generated by the tested diesel vehicle 101 is discharged through the third pipeline 9. Since the exhaust gas generated by the tested diesel vehicle 101 has a relatively high temperature, when the exhaust gas with a relatively high temperature enters the vacuum pump 5 through the third pipeline 9 and the second pipeline 8 in sequence, the heat will be transferred to the vacuum pump 5 and its temperature will increase, thereby reducing the exhaust efficiency of the vacuum pump 5. Therefore, by arranging a gas cooling device in the third pipeline 9, the exhaust gas in the third pipeline 9 can be cooled in time, and the heating rate of the vacuum pump 5 can be slowed down, thereby ensuring that the vacuum pump 5 has a good operating environment.

[0030] In some embodiments, the test system further includes a measurement and control unit 14, which includes a computer 1401 and a data acquisition box 1402; the computer 1401 is electrically connected to the data acquisition box 1402, the data acquisition box 1402 is located in the test chamber 1, and the data acquisition box 1402 is used to collect performance parameters of the diesel vehicle 101 under test.

[0031] like Figure 1 and Figure 2As shown, when conducting a low-temperature and low-pressure cold start test, it is necessary to control the diesel vehicle 101 under test to start and run, and obtain the performance parameters of the diesel vehicle 101 under the current operating state, so that the test personnel can evaluate the working performance of the diesel vehicle 101 under the low-temperature and low-pressure environment according to the obtained performance parameters; specifically, the measurement and control unit 14 includes a computer 1401 and a data acquisition box 1402 that are electrically connected to each other. The data acquisition box 1402 can be electrically connected to sensors or instruments and other components of the diesel vehicle 101 under test through a wiring harness or a test terminal, and is used to collect the performance parameters of the diesel vehicle 101 under test during the start or operation process. The performance parameters of the diesel vehicle 101 under test are obtained, such as starting voltage, starting current, intake air temperature, coolant temperature, fuel temperature, oil temperature, diesel engine speed and other performance parameters, and the obtained performance parameters are sent to the computer 1401 through the wiring harness. The computer 1401 receives the performance parameters, analyzes and processes them, and displays them in the form of numbers and tables through the output module (such as a display panel) of the computer 1401. At the same time, the obtained performance parameters are recorded and stored for the test personnel to consult, so as to judge the adaptability of the diesel vehicle 101 under test to the low temperature and low pressure environment.

[0032] In addition, since the use of the data acquisition box 1402 requires the collection of more performance parameters, there are more connecting wires between the data acquisition box 1402 and the diesel vehicle 101 under test; setting the data acquisition box 1402 inside the test chamber 1 can reduce the number of wires passing through the test chamber 1 and ensure that the test chamber 1 has good sealing.

[0033] In some embodiments, the test system also includes a temperature and humidity sensor 15 and a pressure sensor 16; the temperature and humidity sensor 15 and the pressure sensor 16 are both electrically connected to the computer 1401, the temperature and humidity sensor 15 is used to collect the temperature and humidity in the test chamber 1, and the pressure sensor 16 is used to collect the air pressure in the test chamber 1.

[0034] like Figure 1 and Figure 2As shown, the test system includes a temperature and humidity sensor 15 and a pressure sensor 16 arranged in the test chamber 1; during the operation of the refrigeration dehumidifier 3, the temperature information and humidity information in the test chamber 1 can be collected in real time through the temperature and humidity sensor 15, and the collected temperature information and humidity information are sent to the computer 1401 to determine whether the temperature information and humidity information in the test chamber 1 are in the preset test range, that is, to determine whether the temperature information and humidity information in the test chamber 1 meet the preset test requirements; similarly, the pressure sensor 16 can be used to collect the air pressure information in the test chamber 1 in real time, and then the collected air pressure information is sent to the computer 1401. After receiving the air pressure information of the test chamber 1, the computer 1401 determines whether the air pressure information in the test chamber 1 meets the preset test requirements; when at least one of the temperature information, humidity information and air pressure information in the test chamber 1 does not meet the preset test requirements, the test personnel need to adjust the test environment in the test chamber 1 in time to ensure the stability of the low temperature and low pressure environment in the test chamber 1.

[0035] In some embodiments, a plurality of temperature and humidity sensors 15 and pressure sensors 16 are provided, and the plurality of temperature and humidity sensors 15 and pressure sensors 16 are arranged on the inner wall of the diesel vehicle 101 under test and the test chamber 1 .

[0036] Since the internal space of the test chamber 1 is relatively large, and the diesel vehicle 101 under test will also consume the gas inside the test chamber 1 during operation, a plurality of temperature and humidity sensors 15 and a plurality of pressure sensors 16 are arranged in the test chamber 1 to collect the temperature information, humidity information and pressure information in different areas of the test chamber 1, so as to obtain the temperature and humidity distribution and the air pressure distribution in the test chamber 1, and determine whether the low temperature and low pressure environment in the test chamber 1 is consistent with the climate environment of the actual plateau area; wherein, when the temperature information, humidity information and air pressure information in the test chamber 1 received by the computer 1401 meet the preset test conditions, such as the test chamber 1 If the deviations of temperature information, humidity information and air pressure information in different areas of the test cabin are small, the low temperature and low pressure environment in the test cabin 1 is more consistent with the climate environment of the actual plateau area, and the test results obtained are relatively accurate; when the computer 1401 receives at least one of the temperature information, humidity information and air pressure information in different areas of the test cabin 1 and the deviation is too large, the low temperature and low pressure environment formed in the test cabin 1 is less stable, and the simulated low temperature and low pressure environment is less consistent with the climate environment of the actual plateau area. Therefore, the test results of the low temperature and low pressure cold start test are less accurate, and the test personnel are required to make timely adjustments to the low temperature and low pressure environment in the test cabin 1.

[0037] In some embodiments, the measurement and control unit 14 also includes a control panel 1403, a relay box 1404 and a junction box 1405; the control panel 1403 is electrically connected to the computer 1401, the relay box 1404 is electrically connected to the control panel 1403 and the junction box 1405 respectively, and the junction box 1405 is electrically connected to the electrical control system of the diesel vehicle 101 under test.

[0038] like Figure 1 and Figure 2 As shown, in the low-temperature and low-pressure cold start test, since the test chamber 1 needs to simulate the climate environment of the plateau area, the temperature and air pressure inside the test chamber 1 are relatively low, which is not conducive to the test personnel operating the diesel vehicle 101 under test in the test chamber 1. Therefore, the test control unit 14 in the test system can be used to control the diesel vehicle 101 under test to ensure the safety of the test personnel; wherein the test control unit 14 includes a control panel 1403, a relay box 1404 and a junction box 1405 connected in sequence, and the junction box 1405 is arranged inside the test chamber 1 and is connected to the electrical control system of the diesel vehicle 101 under test through a wiring harness. The control panel 1403 is used to adjust the operating state of the diesel vehicle 101 under test. For example, the electrical control system of the diesel vehicle 101 under test may include an ignition switch and a start switch, and may also include at least one of an intake air preheating device switch, a fuel preheating device switch, a coolant heater control switch, and a starting capacitor control switch. The operating state of the diesel vehicle 101 under test can be changed through the control panel 1403, and the performance parameters of the diesel vehicle 101 under different operating states can be obtained by using the computer 1401 and the data acquisition box 1402, so as to detect the actual performance of the diesel vehicle 101 under test in a low temperature and low pressure environment.

[0039] In some embodiments, Figure 3As shown, the computer 1401 in the measurement and control unit 14 can be electrically connected to the air supply device 2, the refrigeration and dehumidifier 3, the heating and humidification machine 4, the gas preheating device 6, the gas precooling device 13, the vacuum pump 5 and the gas regulating valve 11, so as to control the working state of each device through the computer 1401; wherein, when at least one of the temperature information, humidity information and air pressure information in the test chamber 1 is detected by the temperature and humidity sensor 15 and the pressure sensor 16 to be inconsistent with the preset test conditions, the air supply device 2 and the gas regulating valve 11 can be controlled by the computer 1401 to adjust the test environment in the test chamber 1; for example, if the computer 1401 and the temperature and humidity sensor 15 detect that the temperature in the test chamber 1 is higher than the preset temperature in the preset test conditions, the refrigeration and dehumidification unit can be controlled by the computer 1401 to increase the refrigeration power so that the test chamber 1 The temperature inside the test chamber 1 is lowered until the temperature inside the test chamber 1 meets the preset test conditions; for another example, if the computer 1401 and the temperature and humidity sensor 15 detect that the humidity inside the test chamber 1 is higher than the preset humidity in the preset test conditions, the computer 1401 can be used to control the refrigeration and dehumidification unit to increase the dehumidification power until it meets the preset test conditions; for another example, if the computer 1401 and the pressure sensor 16 detect that the air pressure inside the test chamber 1 is lower than the preset air pressure in the preset test conditions, the computer 1401 can be used to control the air replenishment device 2 to increase the gas replenishment amount so that the air pressure in the test chamber 1 is increased; if it is detected that the air pressure inside the test chamber 1 is higher than or lower than the preset air pressure in the preset test conditions, the computer 1401 can be used to control the vacuum pump 5 to increase the exhaust power so that the test air pressure in the test chamber 1 drops until it meets the preset test conditions.

[0040] Based on the same inventive concept, the present application also provides a test method for low-temperature and low-pressure cold start of a cabin-type diesel vehicle, which is applicable to a test system as in any of the above embodiments, and the test system also includes a measurement and control unit 14 and a sensor module connected to each other, such as Figure 4 As shown, the test methods include:

[0041] Step S100: providing a diesel vehicle 101 to be tested, and checking whether the diesel vehicle 101 to be tested can be started normally;

[0042] In this step, a diesel vehicle 101 to be tested is selected and provided, and various systems and vehicle conditions of the diesel vehicle 101 to be tested are checked to determine whether the diesel vehicle 101 to be tested can be started and operated normally; for example, the vehicle condition of the diesel vehicle 101 to be tested can be inspected in accordance with the requirements of the automobile starting performance test method and other specifications, and the lubricating oil, fuel and coolant of the diesel vehicle 101 to be tested are replaced, and various cold start auxiliary devices are checked for faults; the vehicle is started, and when various cold start auxiliary devices, electrical control systems, control instruments and other devices of the vehicle can operate normally, it means that the diesel vehicle 101 to be tested can be started normally and meets the test requirements.

[0043] Step S200: When it is determined that the diesel vehicle 101 under test can be started normally, the diesel vehicle 101 under test is transferred to the test chamber 1, the measurement and control unit 14 is electrically connected to the electrical control system of the diesel vehicle 101 under test, and the sensor module is arranged inside the test chamber 1, and the diesel vehicle 101 under test is started to detect whether the measurement and control unit 14 can adjust the operating conditions of the diesel vehicle 101 under test and whether the performance parameters of the diesel vehicle 101 under test can be obtained.

[0044] In this step, when it is determined that the diesel vehicle 101 under test does not have any faults that affect the low-temperature and low-pressure cold start test and can be started normally, the diesel vehicle 101 under test is transferred to the test chamber 1; after the transfer is completed, the measurement and control unit 14 in the test system is electrically connected to the electrical control system of the diesel vehicle 101 under test, and the measurement and control system is used to implement a cold start on the diesel vehicle 101 under test, and the operating state of the diesel vehicle under test is controlled, so as to obtain the performance parameters of the diesel vehicle 101 under low-temperature and low-pressure environment, and the sensor module is arranged in the test chamber 1, such as the inner wall of the test chamber 1 or the surface of the diesel vehicle 101 under test, for obtaining the test The actual temperature, humidity and air pressure in the test chamber 1; when conducting a low-temperature and low-pressure cold start test, the test chamber 1 needs to be kept sealed to ensure the stability of the low-temperature and low-pressure environment in the test chamber 1; after the measurement and control unit 14 is connected to the electrical control system of the diesel vehicle 101 under test, the diesel vehicle 101 under test is controlled to start. At this time, based on the control of the diesel vehicle 101 under test by the measurement and control unit 14 and the performance acquisition of the performance parameters of the diesel vehicle 101 under test, it is determined that there is a fault in the electrical connection between the measurement and control unit 14 and the diesel vehicle 101 under test, so as to avoid delaying the test progress of the low-temperature and low-pressure cold start test.

[0045] Step S300: When it is determined that the measurement and control unit 14 can adjust the operating conditions of the diesel vehicle 101 under test and can obtain the performance parameters of the diesel vehicle 101 under test, the refrigeration and dehumidifier 3 is controlled to start so as to reduce the temperature and humidity in the test chamber 1, and the measurement and control unit 14 and the sensor module are controlled to obtain the actual temperature and humidity in the test chamber 1;

[0046] In this step, when it is determined that the measurement and control unit 14 can adjust the operating conditions of the diesel vehicle 101 under test and can obtain the performance parameters of the diesel vehicle 101 under test, it means that the electrical connection relationship between the measurement and control unit 14 and the diesel vehicle 101 under test is normal; at this time, the refrigeration and dehumidifier 3 is controlled to be turned on, and the refrigeration function of the refrigeration and dehumidifier 3 is used to reduce the test temperature in the test chamber 1 to form a low-temperature environment in the test chamber 1, and its dehumidification function is used to remove the water vapor in the test chamber 1 to reduce the interference of water vapor on the low-temperature and low-pressure cold start test; at the same time, the actual temperature and actual temperature in the test chamber 1 are obtained through the measurement and control unit 14 and the sensor module to determine whether the test environment after being processed by the refrigeration and dehumidifier 3 meets the preset first test condition; wherein, the first preset test condition may be that the actual temperature in the test chamber 1 is within the preset test temperature range, and the actual humidity in the test chamber 1 is within the preset test humidity range.

[0047] Step S400: When it is determined that the actual temperature and the actual humidity both meet the first preset test condition, the vacuum pump 5 and the air supply device 2 are controlled to start, and the measurement and control unit 14 and the sensor module are controlled to obtain the actual air pressure in the test chamber 1;

[0048] In this step, when it is determined that the actual temperature and the actual humidity in the test chamber 1 both meet the first preset test condition, that is, the actual temperature in the test chamber 1 is within the preset test temperature range, and the actual humidity in the test chamber 1 is within the preset test humidity range, then the temperature and humidity in the test chamber 1 are suitable for a low-temperature and low-pressure cold start test; the air supply device 2 is used to supply gas to the test chamber 1 for starting and running the diesel vehicle 101 under test, and the gas in the test chamber 1 is exhausted by the vacuum pump 5 to dynamically adjust the air pressure in the test chamber 1; at the same time, the actual air pressure in the test chamber 1 is obtained in real time by the measurement and control unit 14 and the sensor module to determine whether the test environment after adjustment by the air supply device 2 and the vacuum pump 5 meets the preset second test condition; wherein, the second preset test condition may be that the actual air pressure in the test chamber 1 is within the preset test air pressure range.

[0049] Step S500: When it is determined that the actual air pressure meets the second preset test condition, the measurement and control unit 14 is controlled to cold start the diesel vehicle 101 under test, adjust the operating conditions of the diesel vehicle 101 under test, and control the measurement and control unit 14 to obtain the performance parameters of the diesel vehicle 101 under the current operating conditions;

[0050] In this step, when it is determined that the actual air pressure meets the second preset test condition, that is, the actual air pressure in the test chamber 1 is within the preset test air pressure range, then the test air pressure of the test chamber 1 is suitable for performing a low-temperature and low-pressure cold start test on the diesel vehicle 101 under test. At this time, the actual temperature, actual humidity and actual air pressure in the test chamber 1 all meet the test requirements of the low-temperature and low-pressure cold start test. The measurement and control unit 14 is used to cold start the diesel vehicle 101 under test, and the operating conditions of the diesel vehicle 101 under test are changed through the measurement and control unit 14. At the same time, the performance parameters of the diesel vehicle 101 under test under the current operating conditions are obtained, so as to evaluate the working performance of the diesel vehicle 101 under test in a low-temperature and low-pressure environment according to the performance parameters, and determine whether the diesel vehicle 101 under test is suitable for coping with the low-pressure and high-cold climate in the plateau area.

[0051] It should be noted that the diesel vehicle 101 under test will generate heat during operation, thereby interfering with the low-temperature environment in the test cabin 1; the actual temperature in the test cabin 1 can be obtained in real time through the sensor module, and when the actual temperature in the test cabin 1 does not meet the first preset test condition, the refrigeration and dehumidification unit is controlled to re-regulate the actual temperature in the test cabin 1; in addition, the diesel vehicle 101 under test will consume the gas in the test cabin 1 during operation, so that the air pressure in the test cabin 1 gradually decreases, destroying the air pressure balance in the test cabin 1, and because the vehicle conditions of the diesel vehicle 101 under test are different, the gas consumption is also different; therefore, when the sensor module detects that the actual air pressure in the test cabin 1 is lower than the second preset test condition, the power of the air supply device 2 is controlled to increase, thereby improving the air supply efficiency, so as to increase the actual air pressure in the test cabin 1 and improve the air pressure environment in the test cabin 1.

[0052] Step S600: When it is determined that the low-temperature and low-pressure cold start test of the tested diesel vehicle 101 is completed, the vacuum pump 5 and the refrigeration dehumidifier 3 are controlled to stop working in sequence, and the air supply device 2 is controlled to continue to deliver gas to the test cabin 1 to increase the test air pressure in the test cabin 1, the heating humidifier 4 is controlled to start to increase the temperature and humidity in the test cabin 1, and the measurement and control unit 14 and the sensor module are controlled to obtain the current temperature, current humidity and current air pressure in the test cabin 1;

[0053] In this step, after determining that the low-temperature and low-pressure cold start test of the diesel vehicle 101 under test is completed, the measurement and control unit 14 is used to control the diesel vehicle 101 under test to shut down, and the vacuum pump 5 and the refrigeration and dehumidification machine 3 are controlled to stop working, that is, the gas extraction and exhaust in the test cabin 1 are stopped, and the refrigeration and dehumidification in the test cabin 1 are stopped; at the same time, in order to facilitate the opening of the door of the test cabin 1, the air replenishment device 2 is controlled to continue to replenish gas into the test cabin 1 to increase the internal air pressure in the test cabin 1, and at the same time, the heating and humidification machine 4 is controlled to start and operate, and the heating and humidification machine 4 is used to heat and humidify the inside of the test cabin 1 to increase the internal air pressure in the test cabin 1. The temperature and humidity in the test cabin 1 improve the low temperature and low pressure test environment in the test cabin 1 so that the hatch of the test cabin 1 can be opened smoothly, so that the test personnel can enter the test cabin 1 to carry out dismantling and cleaning work; to ensure that the current temperature, current humidity and current air pressure in the test cabin 1 meet the preset stability conditions, it is necessary to obtain the current temperature, current humidity and current air pressure in the test cabin 1 in real time through the measurement and control unit 14 and the sensor module; among which, the preset stability condition can be that the current temperature, current humidity and current air pressure in the test cabin 1 are the same as the temperature, humidity and air pressure around the test cabin 1.

[0054] Step S700: When it is determined that the current temperature, current humidity and current air pressure all meet the preset stability conditions, the air supply device 2 and the heating and humidifying machine 4 are controlled to be turned off, and the diesel vehicle 101 under test is transferred from the test chamber 1 to outside the chamber.

[0055] In this step, when it is determined that the current temperature, current humidity and current air pressure in the test cabin 1 all meet the preset stability conditions, that is, the current temperature, current humidity and current air pressure in the test cabin 1 are the same as the temperature, humidity and air pressure outside the test cabin 1, the internal and external environments of the test cabin 1 tend to be the same. At this time, the air supply device 2 and the heating and humidification device are controlled to be closed, so that the test personnel can open the cabin door and enter the test cabin 1 to carry out dismantling and cleaning work, and it is also convenient to transfer the diesel vehicle 101 under test from the test cabin 1 to the outside of the cabin.

[0056] It should be noted that the electrical control system of the above-mentioned diesel vehicle 101 under test may include at least one of an ignition switch, a start switch, an intake gas preheating device 6 switch, a fuel gas preheating device 6 switch, a coolant fuel heater control switch, and a supercapacitor control switch; the sensor module may include a temperature and humidity sensor 15 and a pressure sensor 16, which will not be elaborated here.

[0057] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0058] The various embodiments in the present application are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0059] The description of the present application is given for the purpose of illustration and description, and is not intended to be exhaustive or to limit the present application to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present application, and to enable those of ordinary skill in the art to understand the present application and thus design various embodiments with various modifications suitable for specific purposes.

[0060] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0061] Although the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description.

[0062] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. A test system for low temperature and low pressure cold start of cabin diesel vehicles, It is characterized in that It includes a test chamber, an air supply device, a refrigeration dehumidifier, a heating humidifier, a vacuum pump and a gas preheating device, wherein the test chamber is used to accommodate the diesel vehicle under test; The air supply device is connected to the test cabin through a first pipeline, and is used to provide gas to the test cabin; the refrigeration dehumidifier and the heating humidifier are both connected to the test cabin, and the refrigeration dehumidifier is used to adjust the temperature and humidity in the test cabin to a preset test range; The vacuum pump is connected to the test chamber via a second pipeline and is used to extract the gas in the test chamber; the gas preheating device is arranged in the second pipeline and is used to heat the gas in the second pipeline.

2. The test system for low temperature and low pressure cold start of cabin-type diesel vehicles according to claim 1, It is characterized in that The exhaust pipe of the diesel vehicle under test is connected to a third pipeline, and the third pipeline extends outside the test chamber. The second pipeline between the gas preheating device and the vacuum pump is connected to the gas outlet end of the third pipeline; an exhaust gas pressure stabilizing device is provided on the third pipeline, and the exhaust gas pressure stabilizing device is located outside the test chamber.

3. The test system for low temperature and low pressure cold start of cabin-type diesel vehicles according to claim 2, It is characterized in that The second pipeline is provided with a gas regulating valve, and the gas regulating valve is located between the gas outlet end of the third pipeline and the vacuum pump, and is used for regulating the gas flow flowing into the vacuum pump.

4. The test system for low temperature and low pressure cold start of cabin-type diesel vehicles according to claim 3, It is characterized in that The third pipeline is also provided with a gas filter for filtering the exhaust gas of the diesel vehicle under test. The gas filter is located outside the test chamber and is arranged between the diesel vehicle under test and the exhaust gas pressure stabilizing device.

5. The test system for low temperature and low pressure cold start of cabin-type diesel vehicles according to claim 4, It is characterized in that The third pipeline is also provided with a gas precooling device for cooling the exhaust gas of the diesel vehicle under test. The gas precooling device is located outside the test chamber and is arranged between the diesel vehicle under test and the gas filter.

6. The test system for low temperature and low pressure cold start of cabin-type diesel vehicles according to claim 1, It is characterized in that It also includes a measurement and control unit, which includes a computer and a data acquisition box; the computer is electrically connected to the data acquisition box, the data acquisition box is located in the test cabin, and the data acquisition box is used to collect performance parameters of the diesel vehicle under test.

7. The test system for low temperature and low pressure cold start of cabin-type diesel vehicles according to claim 6, It is characterized in that It also includes a temperature and humidity sensor and a pressure sensor; the temperature and humidity sensor and the pressure sensor are both electrically connected to the computer, the temperature and humidity sensor is used to collect the temperature and humidity in the test chamber, and the pressure sensor is used to collect the air pressure in the test chamber.

8. The test system for low temperature and low pressure cold start of cabin-type diesel vehicles according to claim 7, It is characterized in that The temperature and humidity sensors and the pressure sensors are provided in plurality, and the plurality of temperature and humidity sensors and the pressure sensors are arranged on the inner wall of the diesel vehicle under test and the test chamber.

9. The test system for low temperature and low pressure cold start of cabin-type diesel vehicles according to claim 7 or 8, It is characterized in that The measurement and control unit also includes a control panel, a relay box and a junction box; The control panel is electrically connected to the computer, the relay box is electrically connected to the control panel and the junction box respectively, and the junction box is electrically connected to the electrical control system of the diesel vehicle under test.

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