Vehicle sealing test method, system and device

Abstract

The present application relates to a vehicle sealing test method, system and device. The method is applied to a vehicle cabin air tightness test bench, and includes: obtaining a simulated pressure difference between the inside and outside of the cab obtained by simulating the target vehicle in different driving states; evacuating the air pressure in the cab according to the simulated pressure difference between the inside and outside of the cab, and controlling the actual air pressure inside and outside the cab to be the simulated pressure difference between the inside and outside of the cab, so as to simulate the state where there is a pressure difference between the inside and outside of the cab when the target vehicle is driving within a preset speed range, and the simulated pressure difference between the inside and outside of the cab is positively correlated with the driving speed of the target vehicle; obtaining a first pressure value detected by a first pressure sensor and a second pressure value detected by a second pressure sensor, and calculating the difference between the first pressure value and the second pressure value; when it is determined based on the difference that the pressure difference stability condition is met, instructing the rain test chamber to control the water flow of the water pump to perform a vehicle sealing test. The use of this method can improve the accuracy of vehicle sealing tests.

Description

Technical Field

[0001] The present application relates to the field of automobile testing technology, and in particular to a vehicle sealing testing method, system and device. Background Art

[0002] The rainproof sealing of the cab is an important performance indicator of the automobile. The rain test method is currently the main method for testing the rainproof sealing of the vehicle cab. Traditional vehicle rain test methods are all conducted on stationary vehicles.

[0003] However, when a vehicle's driving creates a pressure differential between the inside and outside of the cab, the vehicle's sealing components and structures may deform, affecting the cab's rainproof seal. This makes static rain tests inaccurate. Therefore, current rain test methods cannot accurately measure vehicle sealing. Summary of the Invention

[0004] Based on this, it is necessary to provide a vehicle sealing test method, system and device that can improve the accuracy of vehicle sealing test in order to address the above technical problems.

[0005] In a first aspect, the present application provides a vehicle sealing test method, which is applied to a vehicle cabin air tightness test bench, wherein the vehicle cabin air tightness test bench is connected to the cab of a target vehicle via a sealed air pipe, a first pressure sensor in the cab is connected to the vehicle cabin air tightness test bench via a pressure delivery air pipe, and a second pressure sensor is provided in the vehicle cabin air tightness test bench. The target vehicle is placed in a rain test chamber, and the method comprises:

[0006] Acquire simulated pressure differences between the interior and exterior of the cab by simulating the target vehicle in different driving states;

[0007] The air pressure in the cab is pumped out according to the simulated pressure difference between the inside and outside of the cab, and the actual pressure difference between the inside and outside of the cab is controlled to be the simulated pressure difference between the inside and outside of the cab, so as to simulate the pressure difference between the inside and outside of the cab when the target vehicle is traveling within a preset speed range. The simulated pressure difference between the inside and outside of the cab is positively correlated with the driving speed of the target vehicle;

[0008] Obtaining a first pressure value detected by the first pressure sensor and a second pressure value detected by the second pressure sensor, and calculating a difference between the first pressure value and the second pressure value;

[0009] When it is determined based on the difference that the pressure difference stability condition is met, the rain test chamber is instructed to control the water flow of the water pump to place the target vehicle in a rain environment for vehicle sealing testing.

[0010] In one embodiment, the door glass of the cab of the target vehicle is in a lowered state, and a sealing plate is installed at the window position of the cab. The shape and size of the sealing plate are the same as those of the door glass, and it has a first through hole and a second through hole. The sealing air pipe passes through the first through hole and is connected to the vehicle cabin air tightness test bench, and the pressure delivery air pipe passes through the second through hole and is connected to the vehicle cabin air tightness test bench, and the pressure delivery air pipe is also connected to the second pressure sensor.

[0011] In one embodiment, the simulated pressure difference between the inside and outside of the cab is calculated based on the driving speed and the ambient base wind speed, and the simulated pressure difference between the inside and outside of the cab is calculated using the following formula:

[0012]

[0013] ΔP=P-P0

[0014] Where, P is the simulated air pressure in the cab, K h is the altitude correction factor, K t is the ambient temperature correction coefficient, P0 is the no-wind pressure, v is the driving speed, u is the ambient basic wind speed, a0 is the no-wind sound speed, and ΔP is the simulated pressure difference between the inside and outside of the cab.

[0015] In one embodiment, the vehicle cabin air tightness test bench includes a gas flow meter, which is connected to a sealed air pipe. The method also includes: when a pressure difference stability condition is met, detecting the air flow at the air inlet of the sealed air pipe through the gas flow meter; and calculating the gas leakage in the cab based on the air flow.

[0016] In one embodiment, the rain test chamber is instructed to control the water flow of the water pump to place the target vehicle in a rain environment for a vehicle sealing test, including: for multiple target driving speeds within a preset vehicle speed range, the rain test chamber is instructed to traverse the preset rain intensity levels in turn, and the target vehicle is rain tested according to the preset rain intensity levels traversed to simulate the working conditions of the target vehicle experiencing multiple different rainfall amounts at different target driving speeds, and obtain the vehicle sealing test results.

[0017] In one embodiment, the rain test chamber includes a control cabinet, a rain pipe, multiple rain nozzles and a liquid flow meter, a water pump is connected to the control cabinet, and the rain pipe is connected to the water pump, multiple rain nozzles and the liquid flow meter, and multiple rain nozzles are arranged above and around the rain test chamber. Before the target vehicle is rain tested according to the preset rain intensity level traversed, the method also includes: instructing the control cabinet of the rain test chamber to control the water pump to supply water to the rain pipe; instructing the liquid flow meter to detect the water flow in the rain pipe; instructing the control cabinet to obtain the detected water flow in the rain pipe, and calculating the rain intensity in the rain test chamber based on the water flow in the rain pipe. When the rain intensity reaches the preset rain intensity level traversed, it continues for a preset time period.

[0018] In a second aspect, the present application also provides a vehicle sealing test system. The system comprises:

[0019] The vehicle cabin air tightness test bench is connected to the cab of the target vehicle through a sealed air pipe. The first pressure sensor in the cab is connected to the vehicle cabin air tightness test bench through a pressure delivery air pipe. The vehicle cabin air tightness test bench is provided with a second pressure sensor.

[0020] The vehicle cabin air tightness test bench is used to obtain the simulated pressure difference between the inside and outside of the cab by simulating the target vehicle in different driving conditions;

[0021] The air pressure in the cab is pumped out according to the simulated pressure difference between the inside and outside of the cab, and the actual pressure difference between the inside and outside of the cab is controlled to be the simulated pressure difference between the inside and outside of the cab, so as to simulate the pressure difference between the inside and outside of the cab when the target vehicle is traveling within a preset speed range. The simulated pressure difference between the inside and outside of the cab is positively correlated with the driving speed of the target vehicle;

[0022] Obtaining a first pressure value detected by the first pressure sensor and a second pressure value detected by the second pressure sensor, and calculating a difference between the first pressure value and the second pressure value;

[0023] The rain test chamber has a target vehicle built in. When it is determined based on the difference that the pressure difference stability condition is met, the rain test chamber is used to control the water flow of the water pump to place the target vehicle in a rain environment for vehicle sealing testing.

[0024] In a third aspect, the present application further provides a vehicle sealing test device. The vehicle sealing test device is applied to a vehicle cabin airtightness test bench, which is connected to the driver's cab of a target vehicle via a sealed air pipe. A first pressure sensor in the driver's cab is connected to the vehicle cabin airtightness test bench via a pressure delivery air pipe. A second pressure sensor is provided in the vehicle cabin airtightness test bench. The target vehicle is placed in a rain test chamber. The device comprises:

[0025] An acquisition module is used to obtain a simulated pressure difference between the inside and outside of the cab obtained by simulating the target vehicle in different driving states;

[0026] a control module for evacuating the air pressure in the cab according to the simulated pressure differential between the cab and the outside, controlling the actual pressure differential between the cab and the outside to be the simulated pressure differential between the cab and the outside, so as to simulate a pressure differential between the cab and the outside when the target vehicle is traveling within a preset speed range, wherein the simulated pressure differential between the cab and the outside is positively correlated with the speed of the target vehicle;

[0027] a calculation module, configured to obtain a first pressure value detected by the first pressure sensor and a second pressure value detected by the second pressure sensor, and calculate a difference between the first pressure value and the second pressure value;

[0028] The indication module is used to instruct the rain test chamber to control the water flow of the water pump when it is determined based on the difference that the pressure difference stability condition is met, so as to place the target vehicle in a rain environment for vehicle sealing testing.

[0029] In a fourth aspect, the present application further provides a vehicle interior airtightness test bench comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the vehicle airtightness test method described above when executing the computer program.

[0030] In a fifth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps in the vehicle sealing test method described above.

[0031] In a sixth aspect, the present application further provides a computer program product, which includes a computer program that implements the steps in the vehicle sealing test method described above when executed by a processor.

[0032] The above-mentioned vehicle sealing test method, system, device, vehicle cabin air tightness test bench, storage medium and computer program product first obtain the simulated pressure difference inside and outside the cab by simulating the target vehicle in different driving states, and then pump out the air pressure in the cab according to the simulated pressure difference inside and outside the cab, and control the actual pressure difference inside and outside the cab to be the simulated pressure difference inside and outside the cab, so that a pressure difference is generated inside and outside the cab and the simulated pressure difference inside and outside the cab is positively correlated with the driving speed of the target vehicle. It can simulate the state where there is a pressure difference inside and outside the cab when the target vehicle is driving within a preset speed range. After simulating the state in which there is a pressure difference between the inside and outside of the cab when the target vehicle is traveling within a preset speed range, by obtaining the difference in actual air pressure in the cab and in the vehicle cabin air tightness test bench detected by the first pressure sensor and the second pressure sensor respectively, when the difference meets the pressure difference stability condition, the rain test chamber is instructed to control the water flow of the water pump to place the target vehicle in a rain environment for a vehicle sealing test, thereby simulating the target vehicle to conduct a rain test in a driving state, and testing the influence of the pressure difference inside and outside the cab due to the driving of the vehicle on the rainproof sealing of the cab. This is a combined test of air tightness test and rainproof sealing test. Compared with the traditional rain test method that only conducts rainproof sealing test on vehicles in a stationary state, it can improve the accuracy of vehicle sealing test. Moreover, since the preset vehicle speed range includes a low vehicle speed range and a high vehicle speed range, it covers a wide vehicle speed range and correspondingly, a large pressure difference range. Especially when the simulated target vehicle is driving at high speed, the pressure difference generated inside and outside the cab is large. Therefore, it is possible to test the impact of the large pressure difference inside and outside the cab due to the high-speed driving of the vehicle on the rainproof sealing of the cab, thereby further improving the accuracy of the vehicle sealing test. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A diagram showing an application environment of a vehicle sealing test method according to an embodiment;

[0034] Figure 2 1 is a flow chart of a vehicle sealing test method according to an embodiment;

[0035] Figure 3 is a schematic plan view of a sealing plate in one embodiment;

[0036] Figure 4 A schematic structural diagram of a vehicle sealing test system in another embodiment;

[0037] Figure 5 This is a structural block diagram of a vehicle sealing test device in one embodiment;

[0038] Figure 6 The figure is a diagram showing the internal structure of a vehicle interior air tightness test bench in one embodiment. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0040] The vehicle sealing test method provided in the embodiment of the present application can be applied to Figure 1 The application environment shown in FIG. 1 includes a vehicle cabin air tightness test bench 102, a target vehicle 104, and a rain test chamber 106. The vehicle cabin air tightness test bench 102 is connected to the cab of the target vehicle 104 via a sealed air pipe. The first pressure sensor in the cab is connected to the vehicle cabin air tightness test bench 102 via a pressure delivery air pipe. The vehicle cabin air tightness test bench 102 is provided with a second pressure sensor ( Figure 1 The target vehicle 104 is placed in a rain test chamber 106. The cabin air tightness test bench 102 also includes an industrial computer, a blower, and nozzles. The nozzles include large, medium, and small nozzles, with sizes decreasing in sequence. They are used to control the blower's flow rate to extract air from the cab. The blower and the second pressure sensor are both connected to the industrial computer. The blower is also connected in parallel to the large, medium, and small nozzles via a sealed air pipe. The second pressure sensor is connected to the first pressure sensor via a pressure delivery pipe. The vehicle cabin air tightness test bench 102 executes a vehicle sealing test method, including: obtaining a simulated pressure difference between the inside and outside of the cab by simulating the target vehicle 104 in different driving states; evacuating the air pressure in the cab according to the simulated pressure difference between the inside and outside of the cab, and controlling the actual pressure difference between the inside and outside of the cab to be the simulated pressure difference between the inside and outside of the cab, so as to simulate the state where there is a pressure difference between the inside and outside of the cab when the target vehicle is driving within a preset speed range, and the simulated pressure difference between the inside and outside of the cab is positively correlated with the driving speed of the target vehicle; obtaining a first pressure value detected by a first pressure sensor and a second pressure value detected by a second pressure sensor, and calculating the difference between the first pressure value and the second pressure value; when it is determined based on the difference that the pressure difference stability condition is met, instructing the rain test chamber 106 to control the water flow of the water pump to place the target vehicle in a rain environment for a vehicle sealing test.

[0041] In one embodiment, Figure 2 As shown, a vehicle sealing test method is provided, which is applied to Figure 1 Taking the vehicle cabin air tightness test bench in the example of the invention as an example, the vehicle cabin air tightness test bench is connected to the cab of the target vehicle through a sealed air pipe, the first pressure sensor in the cab is connected to the vehicle cabin air tightness test bench through a pressure delivery air pipe, the vehicle cabin air tightness test bench is provided with a second pressure sensor, and the target vehicle is placed in a rain test chamber. The method includes the following steps:

[0042] Step 202 : Acquire simulated pressure differences between the interior and exterior of the cab obtained by simulating the target vehicle in different driving states.

[0043] The target vehicle is a vehicle to be tested for vehicle sealing, and the target vehicle may be a passenger car or a commercial vehicle, etc., which is not limited in the present embodiment. The target vehicle is placed in a rain test chamber, which is a device for providing a rain environment.

[0044] The simulated pressure differential between the inside and outside of the cab is a simulated pressure differential between the inside and outside of a vehicle at a certain speed. When the vehicle is stationary, the actual pressure inside the cab is the atmospheric pressure of the vehicle's surroundings, and no pressure differential exists between the inside and outside of the vehicle's cab. When the vehicle is moving, a pressure differential develops between the inside and outside of the cab. This pressure differential is the difference between the actual pressure inside the cab and the atmospheric pressure of the vehicle's surroundings, and this pressure differential is positively correlated with vehicle speed; the greater the speed, the greater the pressure differential. Therefore, by creating a pressure differential between the inside and outside of the cab and controlling the actual pressure differential between the inside and outside of the cab to the simulated pressure differential, it is possible to simulate the vehicle's driving state at different speeds.

[0045] Specifically, the external computer equipment calculates the pressure difference at different vehicle speeds based on the calculation formula between the pressure difference and the vehicle speed, thereby obtaining the simulated pressure difference inside and outside the cab at different vehicle speeds, and transmits the simulated pressure difference inside and outside the cab to the vehicle cabin air tightness test bench, which obtains the simulated pressure difference inside and outside the cab.

[0046] In other embodiments, the simulated pressure differential between the interior and exterior of the cab can also be calculated by the vehicle cabin air tightness test bench before the test begins. The vehicle cabin air tightness test bench calculates the pressure differential at different vehicle speeds based on a calculation formula relating the pressure differential to vehicle speed, thereby obtaining the simulated pressure differential between the interior and exterior of the cab at different vehicle speeds. The simulated pressure differential between the interior and exterior of the cab is then obtained during the vehicle airtightness test.

[0047] In step 204, the air pressure in the cab is pumped out according to the simulated pressure difference between the inside and outside of the cab, and the actual pressure difference between the inside and outside of the cab is controlled to be the simulated pressure difference between the inside and outside of the cab, so as to simulate the state where there is a pressure difference between the inside and outside of the cab when the target vehicle is traveling within a preset speed range. The simulated pressure difference between the inside and outside of the cab is positively correlated with the driving speed of the target vehicle.

[0048] The preset speed range includes a low speed range and a high speed range. For example, the preset speed range is 0-120 km / h, wherein the low speed range is less than 60 km / h and the high speed range is 60-120 km / h. In this case, the pressure difference between the inside and outside of the cab corresponding to the preset speed range may range from 0 to -500 Pa.

[0049] Specifically, the cabin air tightness test bench is equipped with a blower for extracting air. Connected to the target vehicle's cab via a sealed air pipe, the blower reduces the cabin's pressure based on the simulated pressure differential between the inside and outside of the cab. This reduces the actual cabin pressure to below the target vehicle's ambient atmospheric pressure, simulating the pressure differential between the inside and outside of the cab when the target vehicle enters driving mode from a stationary state. The cabin air tightness test bench controls the actual cabin pressure differential to the simulated pressure differential, simulating the varying pressure differentials between the inside and outside of the cab when the target vehicle is traveling within a preset speed range.

[0050] It should be noted that the greater the simulated vehicle speed, the greater the simulated pressure difference between the inside and outside of the cab.

[0051] Step 206 : Acquire a first pressure value detected by the first pressure sensor and a second pressure value detected by the second pressure sensor, and calculate a difference between the first pressure value and the second pressure value.

[0052] Among them, the first pressure sensor is a pressure sensor arranged in the cab, and the second pressure sensor is a pressure sensor arranged on the vehicle cabin air tightness test bench. The first pressure sensor and the second pressure sensor are connected by a pressure delivery air pipe. The first pressure sensor is used to detect the actual air pressure in the cab and obtain a first pressure value. The first pressure sensor can be set in the middle position of the cab to ensure that a more accurate first pressure value can be detected. Of course, it can also be set at other positions other than near the pipe mouth of the sealed air pipe, such as an open space in the front or rear of the cab, etc., which is not limited in the embodiments of the present application. The second pressure sensor is used to detect the actual air pressure in the vehicle cabin air tightness test bench, that is, the actual air pressure outside the cab, and obtain a second pressure value. The difference between the first pressure value and the second pressure value is the actual pressure difference between the inside and outside of the cab.

[0053] Specifically, the vehicle interior airtightness test bench obtains a first pressure value detected by a first pressure sensor and a second pressure value detected by a second pressure sensor, and calculates a difference between the first pressure value and the second pressure value.

[0054] Step 208 : When it is determined based on the difference that the pressure difference stability condition is met, the rain test chamber is instructed to control the water flow of the water pump to place the target vehicle in a rain environment for a vehicle sealing test.

[0055] The pressure differential stabilization condition can be that the difference between the first pressure value and the second pressure value reaches a simulated pressure differential between the inside and outside of the cab and persists for a preset period of time. The preset period of time can be determined based on specific testing requirements and is not limited in this embodiment. A water pump is provided outside the rain test chamber to supply water to the rain test chamber. The vehicle sealing test controls the amount of rainfall received by the target vehicle to test whether the cab of the target vehicle leaks in a rainy environment, as well as the amount of rainwater that leaks into the cab of the target vehicle, thereby detecting the rainproof sealing quality of the cab of the target vehicle.

[0056] Specifically, the vehicle cabin air tightness test bench determines whether the difference between the first pressure value and the second pressure value meets the pressure differential stability condition. If the pressure differential stability condition is not met, the flow rate of the fan is adjusted to adjust the actual pressure difference inside and outside the cab. When it is determined based on the difference that the pressure differential stability condition is met, an indication signal is issued to remind the tester to open the rain test chamber. After the tester opens the rain test chamber, the rain test chamber controls the water flow rate of the water pump to place the target vehicle in a rain environment for a vehicle sealing test to detect the rainproof sealing of the target vehicle cab.

[0057] In another embodiment, the vehicle interior air tightness test bench communicates with the rain test chamber via wired or wireless means. When the vehicle interior air tightness test bench determines based on the difference that the pressure difference stability condition is met, it sends a control instruction to the rain test chamber so that the rain test chamber starts according to the control instruction and controls the water flow of the water pump to place the target vehicle in a rain environment for a vehicle sealing test to detect the rainproof sealing of the target vehicle cab.

[0058] Since the cab of the target vehicle may have an air leak, in the case of an air leak in the cab, although the actual pressure difference between the inside and outside of the cab detected by the first pressure sensor and the second pressure sensor can also reach the simulated pressure difference between the inside and outside of the cab, it cannot continue for a preset time period after the actual pressure difference between the inside and outside of the cab reaches the simulated pressure difference between the inside and outside of the cab. Therefore, if the target vehicle is subjected to a rain test just after the actual pressure difference between the inside and outside of the cab has just reached the simulated pressure difference between the inside and outside of the cab, the result of the rain test may be inaccurate. Therefore, this embodiment requires that the target vehicle be subjected to a rain test when the actual pressure difference between the inside and outside of the cab meets the pressure differential stability condition. By conducting a rain test on the target vehicle when the actual pressure difference between the inside and outside of the cab meets the pressure differential stability condition, a combined test of an air tightness test and a rainproof sealing test can be achieved, thereby avoiding the influence of the target vehicle cab's air leak on the cab's rainproof sealing, improving the reliability of the rainproof sealing test results, and thus improving the accuracy of the vehicle sealing test.

[0059] In the above-mentioned vehicle sealing test method, the vehicle cabin air tightness test bench first obtains the simulated pressure difference inside and outside the cab by simulating the target vehicle in different driving states, and then evacuates the air pressure in the cab according to the simulated pressure difference inside and outside the cab, and controls the actual pressure difference inside and outside the cab to be the simulated pressure difference inside and outside the cab, so that a pressure difference is generated inside and outside the cab, and the simulated pressure difference inside and outside the cab is positively correlated with the driving speed of the target vehicle, which can simulate the state where there is a pressure difference inside and outside the cab when the target vehicle is driving within a preset speed range. After simulating the state in which there is a pressure difference between the inside and outside of the cab when the target vehicle is traveling within a preset speed range, the vehicle cabin air tightness test bench obtains the difference between the actual air pressure in the cab and the inside of the vehicle cabin air tightness test bench detected by the first pressure sensor and the second pressure sensor respectively. When the difference meets the pressure difference stability condition, it instructs the rain test chamber to control the water flow of the water pump to place the target vehicle in a rain environment for a vehicle sealing test, thereby simulating the target vehicle to perform a rain test in a driving state, and testing the influence of the pressure difference inside and outside the cab due to the driving of the vehicle on the rainproof sealing of the cab. This is a combined test of air tightness test and rainproof sealing test. Compared with the traditional rain test method that only performs rainproof sealing test on vehicles in a stationary state, the vehicle sealing test provided by this method can improve the accuracy of the vehicle sealing test. Moreover, since the preset vehicle speed range includes a low vehicle speed range and a high vehicle speed range, it covers a wide vehicle speed range, and correspondingly, the pressure difference range is large. Especially when the simulated target vehicle is driving at high speed, the pressure difference generated inside and outside the cab is large. Therefore, this method can test the impact of the large pressure difference inside and outside the cab due to high-speed driving of the vehicle on the rainproof sealing of the cab, thereby further improving the accuracy of the vehicle sealing test.

[0060] In one embodiment, Figure 3 As shown, the door glass of the cab of the target vehicle is in the lowered state, and a sealing plate 300 is installed at the window position of the cab. The shape and size of the sealing plate 300 are the same as those of the door glass, and it has a first through hole 302 and a second through hole 304. The sealing air pipe passes through the first through hole 302 and is connected to the vehicle cabin air tightness test bench, and the pressure delivery air pipe passes through the second through hole 304 and is connected to the vehicle cabin air tightness test bench, and the pressure delivery air pipe is also connected to the second pressure sensor.

[0061] Among them, the sealing plate 300 is made of a material with sealing and rainproof properties. The diameter of the first through hole 302 is the same as the outer diameter of the sealing air pipe, and the diameter of the second through hole 304 is the same as the outer diameter of the pressure delivery air pipe. The air inlet of the sealing air pipe is connected to the fan, and the sealing air pipe is used to deliver the air pressure in the cab to the vehicle cabin air tightness test bench and then to the atmosphere. The pressure delivery air pipe is used to connect the vehicle cabin air tightness test bench and the cab of the target vehicle. One end of the pressure delivery air pipe is connected to the second pressure sensor in the vehicle cabin air tightness test bench, and the other end is connected to the first pressure sensor located in the middle position of the cab, so that the vehicle cabin air tightness test bench obtains the first pressure value detected by the first pressure sensor in the cab and the second pressure value detected by the second pressure sensor in the vehicle cabin air tightness test bench. The diameter of the pressure delivery air pipe is much smaller than the diameter of the sealing air pipe.

[0062] The sealed air duct and pressure delivery air duct may also include a desiccant layer made of a highly absorbent material, such as at least one of a superabsorbent resin, soda lime, and sponge. The desiccant layer is located outside the rain test chamber on the sealed air duct and pressure delivery air duct to absorb moisture from the chamber. This prevents moisture from entering the vehicle cabin air tightness test bench, potentially causing short circuits in the industrial control computer or circuits, or corrosion of components within the test bench.

[0063] An observation window is installed on the side of the rain test chamber near the vehicle cabin air tightness test bench. This window opens when a vehicle airtightness test is required and closes or remains open otherwise. The observation window also has a first opening and a second opening. The diameter of the first opening is the same as the outer diameter of the sealing air pipe, and the diameter of the second opening is the same as the outer diameter of the pressure delivery air pipe. Because the target vehicle is placed in the rain test chamber, the sealing air pipe must first pass through the first opening in the rain test chamber's observation window, then through the first through-hole 302. The pressure delivery air pipe must first pass through the second opening in the rain test chamber's observation window, then through the second through-hole 304.

[0064] Specifically, before starting the vehicle sealing test, the tester lowers the door glass of the target vehicle on the side close to the vehicle interior air tightness test bench, makes a sealing plate 300 according to the shape and size of the door glass, and opens holes on the sealing plate 300 according to the outer diameters of the sealing air pipe and the pressure delivery air pipe, respectively, to obtain a first through hole 302 and a second through hole 304; fixes the sealing plate 300 to the window position of the cab on the side where the door glass is lowered with sealing tape, and then passes the sealing air pipe of the fan connected to the vehicle interior air tightness test bench through the first opening on the observation window of the rain test cabin and connects it to the first through hole 302 of the sealing plate 300, and uses The sealing tape is used to seal all the connections between the sealing air pipe and the first opening and the first through hole 302. Then, the pressure delivery air pipe connected to the second pressure sensor in the vehicle cabin air tightness test bench is passed through the second opening on the observation window of the rain test chamber and extended to the middle position of the cab through the second through hole 304 on the sealing plate 300. The first pressure sensor is installed in the middle position of the cab of the pressure delivery air pipe. Finally, the sealing tape is used to seal all the connections between the pressure delivery air pipe and the second opening and the second through hole 304 to obtain an airtight environment with air leakage prevention, so as to carry out a combined test of air tightness test and rainproof sealing test.

[0065] In this embodiment, a sealing plate is installed at the window position of the cab, and holes are opened on the sealing plate to obtain a first through hole and a second through hole, so that the sealing air pipe connected to the vehicle cabin air tightness test bench can be connected to the sealing plate through the first through hole, and the pressure delivery air pipe connected to the vehicle cabin air tightness test bench can be connected to the first pressure sensor in the cab through the second through hole, thereby achieving the purpose of establishing an airtight sealing environment that is leak-proof between the target vehicle and the vehicle cabin air tightness test bench, so that the vehicle cabin air tightness test bench can be used to detect the leakage amount of the target vehicle under different set pressure differences, and the air sealing performance of the target vehicle can be tested and evaluated.

[0066] In one embodiment, the simulated pressure difference between the inside and outside of the cab is calculated based on the driving speed and the ambient base wind speed, and the simulated pressure difference between the inside and outside of the cab is calculated using the following formula:

[0067]

[0068] ΔP=P-P0 (2)

[0069] In formulas (1) and (2), P is the simulated air pressure in the cab, K is h is the altitude correction factor, K t is the ambient temperature correction coefficient, P0 is the no-wind pressure, v is the driving speed, u is the ambient basic wind speed, a0 is the no-wind sound speed, and ΔP is the simulated pressure difference between the inside and outside of the cab.

[0070] Where P is the simulated cab pressure, i.e., the air pressure inside the cab. P0 is the windless pressure, also known as the stagnation pressure, which is the atmospheric pressure outside the cab. a0 is the windless sound speed, also known as the stagnation sound speed, which is 340 m / s. v is the actual vehicle speed, which can be obtained from the vehicle's dashboard, navigation software, or a speed sensor.

[0071] The vehicle cabin air tightness test bench is designed to simulate the pressure difference between the inside and outside of the target vehicle's cab due to the change in vehicle speed by controlling the actual pressure difference between the inside and outside of the cab to the simulated pressure difference between the inside and outside of the cab. For example, when the target vehicle's driving speed is 80 km / h and P0 is the standard atmospheric pressure, i.e., 101325 Pa, according to the above formulas (1) and (2), the simulated pressure difference between the inside and outside of the cab is calculated to be -250 Pa. Under the same altitude conditions, a temperature difference of 20°C will cause the atmospheric pressure P0 of the vehicle's environment to change by 100 Pa to 400 Pa. For example, when the ambient temperature is 10°C, the atmospheric pressure P0 of the vehicle's environment is 101000 Pa. When the ambient temperature is 30°C, the atmospheric pressure P0 of the vehicle's environment is 100600 Pa. Under these two ambient temperatures, if the ambient temperature correction coefficient K is not considered, the atmospheric pressure P0 of the vehicle's environment will be 101000 Pa. t , the calculated simulated pressure difference between the inside and outside of the cab (theoretical value) will have a large error compared to the actual pressure difference between the inside and outside of the cab (actual value). It can be seen that the error caused by the ambient temperature on the atmospheric pressure of the vehicle's environment will affect the accuracy of the pressure difference that needs to be controlled by the vehicle cabin air tightness test bench. Therefore, it is necessary to consider the impact of altitude and ambient temperature on the atmospheric pressure of the vehicle's environment and correct the error caused by altitude and ambient temperature on the atmospheric pressure of the vehicle's environment.

[0072] The altitude correction factor is related to altitude and is used to correct the effect of altitude on the atmospheric pressure of the vehicle's environment. The ambient temperature correction factor is related to ambient temperature and is used to correct the effect of ambient temperature on the atmospheric pressure of the vehicle's environment. The atmospheric pressure corresponding to a specific altitude and temperature will differ from the theoretical value calculated using the formula, especially in high-altitude plateaus, high-temperature areas, or extremely cold regions. Therefore, to mitigate the effects of this difference between the actual and theoretical atmospheric pressure values, the altitude correction factor and the ambient temperature correction factor are used to correct the difference. Multiplying the theoretical value by the corresponding altitude correction factor and ambient temperature correction factor will result in an atmospheric pressure closer to the actual value. The altitude correction factor and the ambient temperature correction factor are engineering correction factors determined by engineers based on extensive test data. Different altitudes correspond to different altitude correction factors, and different ambient temperatures correspond to different ambient temperatures.

[0073] The ambient basic wind speed is the wind speed in the natural environment, which can be measured by an air flow meter. When there is no wind in the natural environment, the ambient basic wind speed is 0. At this time, the following formula can be obtained from formula (1):

[0074]

[0075] When there is wind in the natural environment and the vehicle is traveling with the wind, the following formula can be obtained from formula (1):

[0076]

[0077] When there is wind in the natural environment and the vehicle is traveling against the wind, the following formula can be obtained from formula (1):

[0078]

[0079] Specifically, the external computer device obtains the driving speed within a preset speed range and the environmental base wind speed, altitude correction coefficient, and ambient temperature correction coefficient corresponding to the driving speed. Based on the driving speed, environmental base wind speed, altitude correction coefficient, and ambient temperature correction coefficient, the simulated cab air pressure corresponding to different driving speeds is calculated according to the above formula (1). Furthermore, the simulated pressure difference between the inside and outside of the cab is calculated according to the above formula (2). Since the simulated pressure difference between the inside and outside of the cab is a negative value, when the vehicle is driving, the greater the driving speed, the greater the absolute value of the pressure difference.

[0080] In other embodiments, the calculation of the simulated pressure difference between the inside and outside of the cab corresponding to different driving speeds may also be performed by a vehicle cabin air tightness test bench. The vehicle cabin air tightness test bench obtains the driving speed within a preset speed range and the ambient base wind speed, altitude correction factor, and ambient temperature correction factor corresponding to the driving speed, and calculates the simulated cab air pressure corresponding to different driving speeds according to the driving speed, ambient base wind speed, altitude correction factor, and ambient temperature correction factor according to the above formula (1). Furthermore, the simulated pressure difference between the inside and outside of the cab is calculated according to the above formula (2).

[0081] By considering the influence of the basic environmental wind speed, altitude correction coefficient and ambient temperature correction coefficient on the simulated pressure difference between the inside and outside of the cab, the purpose of calculating the simulated pressure difference between the inside and outside of the cab corresponding to different driving speeds within the preset speed range can be achieved according to the driving speed, basic environmental wind speed, altitude correction coefficient and ambient temperature correction coefficient.

[0082] In one embodiment, the vehicle cabin air tightness test bench includes a gas flow meter, which is connected to a sealed air pipe. The method further includes: detecting the air flow at the air inlet of the sealed air pipe by the gas flow meter when a pressure difference stability condition is met; and calculating the gas leakage amount in the cab based on the air flow.

[0083] The gas flow meter is an instrument used to detect gas flow. The gas flow meter is installed in the vehicle cabin air tightness test bench and connected to the sealed air pipe to detect the air flow at the air inlet of the sealed air pipe.

[0084] Specifically, a gas flow meter detects the air flow at the air inlet of the sealed air pipe. If the difference between the first and second pressure values determined by the vehicle cabin air tightness test bench satisfies a pressure differential stability condition, the vehicle cabin air tightness test bench obtains the air flow detected within a specific time period, calculates the average air flow within the specific time period, and multiplies the average air flow by the specific time period to determine the amount of gas leakage within the cab during the specific time period. If the gas leakage amount is close to zero or less than or equal to a preset threshold, it indicates that the target vehicle's cab is leak-free and has good airtightness. If the gas leakage amount exceeds the preset threshold, it indicates that the target vehicle's cab is leaking and has poor airtightness.

[0085] In this embodiment, a gas flow meter is provided in the vehicle cabin air tightness test bench, and the air flow rate of the air inlet of the sealed air pipe is detected by the gas flow meter, so as to achieve the purpose of detecting the air tightness of the target vehicle cab.

[0086] In one embodiment, the rain test chamber is instructed to control the water flow of the water pump to place the target vehicle in a rain environment for a vehicle sealing test, including: for multiple target driving speeds within a preset vehicle speed range, the rain test chamber is instructed to traverse the preset rain intensity levels in turn, and the target vehicle is rain tested according to the preset rain intensity levels traversed to simulate the working conditions of the target vehicle when experiencing multiple different rainfall amounts at different target driving speeds, and the vehicle sealing test results are obtained.

[0087] Among them, the target driving speed is the driving speed of the target vehicle corresponding to the simulated pressure difference between the inside and outside of the cab. The preset rain intensity level is a level corresponding to the rain intensity obtained by dividing the rain intensity according to the size of the rain intensity. The preset rain intensity level includes a combination of a preset rain intensity and a preset rain time to simulate rainfall conditions on different rainy days such as light rain, moderate rain, heavy rain, rainstorm and extremely heavy rain. The value range of the preset rain intensity level is determined according to the test requirements. For example, the range of the preset rain intensity is 0-30mm / min. As long as it can cover all rainy day conditions such as simulated light rain, moderate rain, heavy rain, rainstorm and extremely heavy rainstorm, this embodiment does not limit this. For example, the preset rain intensity level is the preset rain intensity of the first intensity range, such as 0.05-0.1mm / min, and the preset rain time is the first preset time period, such as 240-360min, to simulate the rainfall situation when it is light rain on a rainy day; the preset rain intensity level is the preset rain intensity of the second intensity range, such as 0.2-0.4mm / min, and the preset rain time is the second preset time period, such as 120-180min, to simulate the rainfall situation when it is moderate rain on a rainy day; the preset rain intensity level is the preset rain intensity of the third intensity range, such as 1-1.5mm / m in, and the preset shower time is a third preset time period, such as 60-90 minutes, to simulate the rainfall conditions when the rainy day is heavy rain; the preset shower intensity level is a fourth intensity range of the preset shower intensity, such as 7-9 mm / min, and the preset shower time is a fourth preset time period, such as 30-40 minutes, to simulate the rainfall conditions when the rainy day is torrential rain; the preset shower intensity level is a fifth intensity range of the preset shower intensity, such as 12-14 mm / min, and the preset shower time is a fifth preset time period, such as 15-20 minutes, to simulate the rainfall conditions when the rainy day is extremely torrential rain.

[0088] The maximum value in the first intensity range is less than the minimum value in the second intensity range, the maximum value in the second intensity range is less than the minimum value in the third intensity range, the maximum value in the third intensity range is less than the minimum value in the fourth intensity range, and the maximum value in the fourth intensity range is less than the minimum value in the fifth intensity range. Furthermore, the lengths of the first, second, third, fourth, and fifth preset time periods decrease in sequence.

[0089] The vehicle sealing test results include whether the target vehicle cab leaks rain or not, which are obtained by manual observation by a tester in the cab, or detected by a humidity sensor or a rain detector, etc. The embodiments of the present application do not limit this.

[0090] Specifically, for multiple target driving speeds within a preset vehicle speed range, the vehicle cabin air tightness test bench sequentially instructs the rain test chamber to traverse preset rain intensity levels, which are a combination of preset rain intensity and preset rain duration, to simulate rainfall conditions on at least one of light rain, moderate rain, heavy rain, rainstorm, and extremely heavy rainstorm. The test bench then performs a rain test on the target vehicle by controlling the water flow rate of the water pump according to the preset rain intensity levels reached, to simulate the operating conditions of the target vehicle experiencing at least one of light rain, moderate rain, heavy rain, rainstorm, and extremely heavy rainstorm at different target driving speeds, thereby obtaining vehicle sealing test results. If the target vehicle's cab does not leak or the amount of rainwater that has seeped into the target vehicle's cab is less than a preset water volume threshold, it indicates that the target vehicle's cab has good rainproof sealing properties. If the amount of rainwater that has seeped into the target vehicle's cab is greater than the preset water volume threshold, it indicates that the target vehicle's cab has poor rainproof sealing properties.

[0091] In this embodiment, rain intensity is divided into multiple preset rain intensity levels. Rain tests are then performed on a target vehicle according to the different preset rain intensity levels. This simulates the operating conditions of the target vehicle when it experiences at least one of light rain, moderate rain, heavy rain, torrential rain, and extremely heavy rain. Because the operating conditions of the vehicle cab vary depending on the rain, rain tests on the target vehicle cab under various rainfall conditions can improve the accuracy of the vehicle sealing test results. For example, under the condition that the target driving speed is the same, the cab of the target vehicle does not leak under the working conditions of heavy rain simulated by the preset rain intensity level of 12-14mm / min and the preset rain time of 15-20min. However, under the working conditions of light rain simulated by the preset rain intensity level of 0.05-0.1mm / min and the preset rain time of 240-360min, water leakage occurs in a certain sealing structure. In this case, if only the working conditions of the cab of the target vehicle are tested under the preset rain intensity level corresponding to the simulated heavy rain, this problem cannot be discovered.

[0092] Moreover, in this embodiment, it is possible to simulate the operating conditions of the target vehicle under any combination of target driving speed and any preset rain intensity level. Compared with the traditional rain test method that only performs rainproof sealing tests on vehicles in a stationary state, by performing rain tests on the target vehicle cab under working conditions combining multiple target driving speeds and different preset rain intensity levels, the purpose of improving the accuracy of the vehicle sealing test results can be achieved; it is also possible to test the influence of the target driving speed and the preset rain intensity level on the vehicle sealing test results, thereby achieving the purpose of further improving the accuracy of the vehicle sealing test results.

[0093] In one embodiment, a rain test chamber includes a control cabinet, a rain pipeline, multiple rain nozzles and a liquid flow meter, a water pump is connected to the control cabinet, and the rain pipeline is connected to the water pump, multiple rain nozzles and the liquid flow meter, and multiple rain nozzles are arranged above and around the rain test chamber. Before performing a rain test on the target vehicle according to the preset rain intensity level traversed, the method also includes: instructing the control cabinet of the rain test chamber to control the water pump to supply water to the rain pipeline; instructing the liquid flow meter to detect the water flow in the rain pipeline; instructing the control cabinet to obtain the detected water flow in the rain pipeline, and calculating the rain intensity in the rain test chamber based on the water flow in the rain pipeline. When the rain intensity reaches the preset rain intensity level traversed, it continues for a preset time period.

[0094] Before performing a rain test on the target vehicle according to the preset rain intensity level traversed, the control cabinet is used to control the water pump to supply water to the rain pipeline, obtain the detected water flow in the rain pipeline, calculate the rain intensity in the rain test chamber based on the water flow in the rain pipeline, determine whether the rain intensity has reached the preset rain intensity level traversed, and determine whether the rain intensity has continued for a preset time period when it reaches the preset rain intensity level traversed. If so, the target vehicle is rain tested according to the preset rain intensity level traversed. When performing a rain test on the target vehicle according to the preset rain intensity level traversed, the control cabinet is used to obtain the preset rain intensity level to be traversed and control the water flow of the water pump according to the preset rain intensity level.

[0095] Multiple rain nozzles are set above and around the rain test chamber. The distance between each rain nozzle and the outer surface of the target vehicle is greater than a preset distance. For example, the distance between each rain nozzle and the outer surface of the target vehicle is at least greater than 500mm. They are used to spray water onto the outer surface of the target vehicle to simulate the state of the target vehicle being placed in a rain environment.

[0096] The shower piping includes a first shower piping installed in the shower test chamber and a second shower piping installed outside the shower test chamber. The first shower piping is connected to multiple shower nozzles, and the second shower piping is connected to a water pump. A liquid flow meter can be connected to either the first shower piping or the second shower piping. The liquid flow meter is an instrument used to detect liquid flow and is used to detect the water flow in the shower piping.

[0097] Specifically, before the rain test chamber conducts a rain test on a target vehicle according to the preset rain intensity level, it is necessary to first determine whether the rain intensity within the rain test chamber meets the rain intensity stability condition. The control cabinet of the rain test chamber obtains the preset rain intensity level to be traversed and controls the water flow rate of the water pump based on the preset rain intensity level, supplying water to the rain pipeline through the water pump. At the same time, a liquid flow meter detects the water flow rate in the rain pipeline and instructs the control cabinet to obtain the water flow rate in the rain pipeline detected by the liquid flow meter. The rain intensity within the rain test chamber is calculated based on the relationship between the rain intensity, the water flow rate in the rain pipeline, the size of the rain nozzle, and the distance between the rain nozzle and the outer surface of the target vehicle. It is then determined whether the rain intensity reaches the preset rain intensity corresponding to the preset rain intensity level. If not, the water flow rate of the water pump is adjusted until the rain intensity reaches the preset rain intensity corresponding to the preset rain intensity level and lasts for a preset period of time. At this point, it is determined that the rain intensity within the rain test chamber meets the rain intensity stability condition.

[0098] In this embodiment, a water pump, multiple shower nozzles and a liquid flow meter are connected through a shower pipe, wherein the shower pipe inside the rain test chamber is connected to the multiple shower nozzles, the shower pipe outside the rain test chamber is connected to the water pump, and the control cabinet of the rain test chamber is connected to the water pump. This can achieve the purpose of establishing a shower environment for vehicle sealing testing, so that the target vehicle can undergo rainproof sealing testing.

[0099] In one embodiment, a vehicle sealing test system is provided, comprising: a cabin air-tightness test bench connected to a cab of a target vehicle via a sealing air pipe, a first pressure sensor in the cab connected to the cabin air-tightness test bench via a pressure delivery air pipe, a second pressure sensor provided in the cabin air-tightness test bench, the cabin air-tightness test bench being configured to: obtain a simulated pressure difference between the inside and outside of the cab obtained by simulating different driving conditions of the target vehicle; evacuate the air pressure in the cab according to the simulated pressure difference between the inside and outside of the cab, and control the actual pressure difference between the inside and outside of the cab to be the simulated pressure difference between the inside and outside of the cab, so as to simulate a state in which a pressure difference exists between the inside and outside of the cab when the target vehicle is traveling within a preset speed range, wherein the simulated pressure difference between the inside and outside of the cab is positively correlated with the driving speed of the target vehicle; obtain a first pressure value detected by the first pressure sensor and a second pressure value detected by the second pressure sensor, and calculate the difference between the first pressure value and the second pressure value; and a rain test chamber housing the target vehicle. When it is determined based on the difference that a pressure differential stability condition is met, the rain test chamber is configured to control the water flow rate of a water pump to place the target vehicle in a rain environment for vehicle sealing testing.

[0100] In one embodiment, the door glass of the cab of the target vehicle is in a lowered state, and a sealing plate is installed at the window position of the cab. The shape and size of the sealing plate are the same as those of the door glass, and it has a first through hole and a second through hole. The sealing air pipe passes through the first through hole and is connected to the vehicle cabin air tightness test bench, and the pressure delivery air pipe passes through the second through hole and is connected to the vehicle cabin air tightness test bench, and the pressure delivery air pipe is also connected to the second pressure sensor.

[0101] In one embodiment, the simulated pressure difference between the inside and outside of the cab is calculated based on the driving speed and the ambient base wind speed, and the simulated pressure difference between the inside and outside of the cab is calculated using the following formula:

[0102]

[0103] ΔP=P-P0

[0104] Where, P is the simulated air pressure in the cab, K h is the altitude correction factor, K t is the ambient temperature correction coefficient, P0 is the no-wind pressure, v is the driving speed, u is the ambient basic wind speed, a0 is the no-wind sound speed, and ΔP is the simulated pressure difference between the inside and outside of the cab.

[0105] In one embodiment, the vehicle cabin air tightness test bench includes a gas flow meter, which is connected to the sealed air pipe. The vehicle cabin air tightness test bench is also used to: detect the air flow at the air inlet of the sealed air pipe through the gas flow meter when the pressure difference stability condition is met; and calculate the gas leakage in the cab based on the air flow.

[0106] In one embodiment, the rain test chamber is also used to: for multiple target driving speeds within a preset vehicle speed range, traverse the preset rain intensity levels in sequence, and perform rain tests on the target vehicle according to the preset rain intensity levels traversed, so as to simulate the working conditions of the target vehicle when experiencing multiple different rainfall amounts at different target driving speeds, and obtain the vehicle sealing test results.

[0107] In one embodiment, the rain test chamber includes a control cabinet, a rain pipe, multiple rain nozzles and a liquid flow meter. The water pump is connected to the control cabinet, and the rain pipe is connected to the water pump, multiple rain nozzles and the liquid flow meter. The multiple rain nozzles are arranged above and around the rain test chamber. The control cabinet is used to control the water pump to supply water to the rain pipe; the liquid flow meter is used to detect the water flow in the rain pipe; the control cabinet is also used to obtain the detected water flow in the rain pipe, and calculate the rain intensity in the rain test chamber according to the water flow in the rain pipe. When the rain intensity reaches the preset rain intensity level traversed, it continues for a preset time period.

[0108] In another embodiment, Figure 4As shown, a vehicle sealing test system and method are provided.

[0109] The vehicle sealing test system includes a target vehicle 7, a cabin air tightness test bench 1, and a rain test chamber 11. The cabin air tightness test bench 1 is used to evacuate the target vehicle's cab and control the pressure differential between the inside and outside of the target vehicle's cab. The pressure differential control range is 0 to -500 Pa, simulating the pressure differential between the inside and outside of the cab when the target vehicle is in motion. The rain test chamber 11 has a rain intensity control range of 0 to 30 mm / min. The top rain nozzle 6 has a height adjustment function and is suitable for rain tests on passenger cars and commercial vehicles. The water flow rate is adjusted by an automatic control program in the control cabinet 9 of the rain test chamber, driving the water pump 10 to adjust the water flow rate. This allows artificial rainfall to simulate the operating conditions of the target vehicle under all rainy scenarios, including light rain, moderate rain, heavy rain, rainstorms, and extremely heavy rainstorms.

[0110] The vehicle sealing test method requires placing the target vehicle 7 in a rain test chamber 11, so that the distance between the rain nozzles 6 in all directions of the rain test chamber 11 and the outer surface of the vehicle body is greater than 500mm, and then lowering the door glass on one side of the target vehicle close to the vehicle interior air tightness test bench 1; making a sealing plate 5 according to the shape and size of the door glass, and opening holes on the sealing plate 5 according to the outer diameter size of the sealing air pipe 3 of the vehicle interior air tightness test bench and the outer diameter size of the pressure delivery air pipe 2, so that they can just pass through the sealing air pipe 3 and the pressure delivery air pipe 2; fixing the sealing plate 5 to the target vehicle 7 with sealing tape, and then passing the sealing air pipe 3 of the vehicle interior air tightness test bench 1 through the opening on the observation window of the rain test chamber 11 and connecting to the sealing plate 5; The sealing plate 5 is sealed with sealing tape, and finally the connection between the sealing air pipe 3 and each hole is sealed with sealing tape. A water-absorbing drying layer 4 is provided in the sealing air pipe 3 and the pressure delivery air pipe 2. During the detection process, part of the water vapor in the rain test chamber 11 will enter the sealing air pipe 3 and the pressure delivery air pipe 2. The water-absorbing drying layer 4 can be made of one or more water-absorbing materials such as super absorbent resin, soda lime and sponge, and is used to absorb the water vapor entering the sealing air pipe 3 and the pressure delivery air pipe 2 during the vehicle sealing test to prevent water vapor from entering the motor or circuit in the vehicle interior air tightness test bench 1 and causing short circuit or corrosion, thereby constructing a complete vehicle sealing test system combining airtightness and rainproof sealing.

[0111] Start the automatic control program of the industrial computer of the vehicle interior air tightness test bench, monitor the pressure difference between the inside and outside of the target vehicle's cab through the first pressure sensor and the second pressure sensor, and set the pressure difference to be arbitrarily controlled within the pressure difference range of 0 to -500Pa (corresponding to a driving speed of 0 to 120km / h). When the pressure difference is detected to have reached the set pressure difference and is stable, start the automatic control program of the rain test chamber, and the rain intensity parameter can be stably controlled within the range of 0 to 30mm / min to simulate rainfall levels of different intensities on rainy days (light rain, moderate rain, heavy rain, rainstorm and extremely heavy rainstorm, etc.); finally, set the pressure difference parameter values and rain intensity parameter values of commonly used target driving speeds (such as 40km / h, 60km / h and 80km / h, etc.) through permutations and combinations to form multiple groups of verification conditions, which can realize continuous simulation and verification of the dynamic rainproof sealing of the vehicle under the combination of any vehicle speed and any rain intensity.

[0112] Specifically, the vehicle sealing test method provided in this embodiment is described by taking a simulated rainy day and a target vehicle driving at a speed of 40 km / h as an example.

[0113] First, start the industrial computer of the vehicle cabin air tightness test bench 1, set the pressure difference value to P1 in the program, the pressure difference between the inside and outside of the cab is positively correlated with the vehicle speed and has a corresponding relationship. The faster the vehicle speed, the greater the pressure difference (when the vehicle speed is 40km / h, the pressure difference between the inside and outside of the cab is P1; when the vehicle speed is 60km / h, the pressure difference between the inside and outside of the cab is P2; when the vehicle speed is 80km / h, the pressure difference between the inside and outside of the cab is P3, among which P3>P2>P1). By adjusting the set pressure difference value, all state conditions of the vehicle speed within the range of 0-120km / h can be simulated. Start the control program of the vehicle cabin air tightness test bench 1, and wait until the pressure difference between the air pressure P' in the cab detected by the first pressure sensor and the air pressure P in the vehicle cabin air tightness test bench detected by the second pressure sensor reaches the driving pressure. After the indoor and outdoor pressure difference P1 is stabilized (P1 = P'-P), the control cabinet 9 of the rain test cabin 11 is started, and the rain intensity value L0 is set in the program. By adjusting the preset rain intensity, the control program automatically controls the water pump 10 to adjust the water flow in the pipeline of the rain test cabin 11. The water flow is collected by the liquid flow meter 8 and fed back to the control program of the control cabinet 9 of the rain test cabin. The preset rain intensity of 0-12mm / min can cover all weather conditions of simulating light rain, moderate rain, heavy rain, rainstorm and extremely heavy rain. Then set the corresponding preset rain time T0-T5 under the corresponding weather conditions, start the control program of the rain test cabin 11, and after the water spraying state of each rain nozzle 6 is stable, the tester in the target vehicle starts timing, and always observes and records the vehicle sealing test results in the cab.

[0114] In this embodiment, by simulating the working conditions of the vehicle being exposed to rain while driving, the problem of the traditional rain test being unable to detect the dynamic rain verification problem under which the pressure difference caused by the vehicle driving affects the vehicle's sealing components and sealing structure is solved. The airtightness test method and the rainproof sealing test method are combined, and the pressure difference parameter values inside and outside the cab and the rain intensity parameter values are set by permutations and combinations. The complex working conditions of the vehicle under any combined vehicle speed and any rain intensity can be continuously simulated and verified.

[0115] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above can include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0116] Based on the same inventive concept, embodiments of the present application also provide a vehicle leak testing device for implementing the aforementioned vehicle leak testing method. The solution provided by this device is similar to the solution described in the aforementioned method. Therefore, the specific limitations of one or more vehicle leak testing device embodiments provided below can be found in the above-described limitations of the vehicle leak testing method and will not be further elaborated here.

[0117] In one embodiment, Figure 5 As shown, a vehicle sealing test device 500 is provided, which is applied to a vehicle cabin air tightness test bench. The vehicle cabin air tightness test bench is connected to the driver's cab of a target vehicle via a sealed air pipe. A first pressure sensor in the driver's cab is connected to the vehicle cabin air tightness test bench via a pressure delivery air pipe. A second pressure sensor is provided in the vehicle cabin air tightness test bench. The target vehicle is placed in a rain test chamber. The vehicle sealing test device 500 includes: an acquisition module 502, a control module 504, a calculation module 506, and an indication module 508, wherein:

[0118] The acquisition module 502 is used to obtain a simulated pressure difference between the inside and outside of the cab obtained by simulating the target vehicle in different driving states.

[0119] The control module 504 is used to pump out the air pressure in the cab according to the simulated pressure difference between the inside and outside of the cab, and control the actual pressure difference between the inside and outside of the cab to the simulated pressure difference between the inside and outside of the cab, so as to simulate the state where there is a pressure difference between the inside and outside of the cab when the target vehicle is traveling within a preset speed range. The simulated pressure difference between the inside and outside of the cab is positively correlated with the driving speed of the target vehicle.

[0120] The calculation module 506 is configured to obtain a first pressure value detected by the first pressure sensor and a second pressure value detected by the second pressure sensor, and calculate a difference between the first pressure value and the second pressure value.

[0121] The indication module 508 is used to instruct the rain test chamber to control the water flow of the water pump when it is determined based on the difference that the pressure difference stability condition is met, so as to place the target vehicle in a rain environment for a vehicle sealing test.

[0122] In one embodiment, the door glass of the cab of the target vehicle is in a lowered state, and a sealing plate is installed at the window position of the cab. The shape and size of the sealing plate are the same as those of the door glass, and it has a first through hole and a second through hole. The sealing air pipe passes through the first through hole and is connected to the vehicle cabin air tightness test bench, and the pressure delivery air pipe passes through the second through hole and is connected to the vehicle cabin air tightness test bench, and the pressure delivery air pipe is also connected to the second pressure sensor.

[0123] In one embodiment, the simulated pressure difference between the inside and outside of the cab is calculated based on the driving speed and the ambient base wind speed, and the simulated pressure difference between the inside and outside of the cab is calculated using the following formula:

[0124]

[0125] ΔP=P-P0

[0126] Where, P is the simulated air pressure in the cab, K h is the altitude correction factor, K t is the ambient temperature correction coefficient, P0 is the no-wind pressure, v is the driving speed, u is the ambient basic wind speed, a0 is the no-wind sound speed, and ΔP is the simulated pressure difference between the inside and outside of the cab.

[0127] In one embodiment, the vehicle cabin air tightness test bench includes a gas flow meter, which is connected to the sealed air pipe. The vehicle sealing test device 500 also includes: a detection module, which is used to detect the air flow at the air inlet of the sealed air pipe through the gas flow meter when the pressure difference stability condition is met; and calculate the gas leakage amount in the cab based on the air flow.

[0128] In one embodiment, the indication module 508 is also used to instruct the rain test chamber to traverse the preset rain intensity levels in sequence for multiple target driving speeds within the preset vehicle speed range, and to perform rain tests on the target vehicle according to the preset rain intensity levels traversed, so as to simulate the working conditions of the target vehicle when experiencing multiple different rainfall amounts at different target driving speeds, and obtain the vehicle sealing test results.

[0129] In one embodiment, the rain test chamber includes a control cabinet, a rain pipeline, multiple rain nozzles and a liquid flow meter. The water pump is connected to the control cabinet, and the rain pipeline is connected to the water pump, multiple rain nozzles and the liquid flow meter. The multiple rain nozzles are arranged above and around the rain test chamber. Before the target vehicle is rain tested according to the preset rain intensity level traversed, the indication module 508 is also used to indicate the control cabinet of the rain test chamber to control the water pump to supply water to the rain pipeline; indicate the liquid flow meter to detect the water flow in the rain pipeline; indicate the control cabinet to obtain the detected water flow in the rain pipeline, calculate the rain intensity in the rain test chamber based on the water flow in the rain pipeline, and when the rain intensity reaches the preset rain intensity level traversed, it continues for a preset time period.

[0130] Each module in the vehicle airtightness test device described above can be implemented in whole or in part through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in the industrial computer of the vehicle airtightness test bench as hardware, or stored in the memory of the industrial computer in the vehicle airtightness test bench as software, allowing the processor to call and execute the corresponding operations of each module.

[0131] In one embodiment, a vehicle interior airtightness test bench is provided, the internal structure of which can be as follows: Figure 6 As shown. The vehicle cabin air tightness test bench includes a fan, a second pressure sensor, an industrial computer and a communication interface. Among them, the fan and the second pressure sensor are both connected to the industrial computer, and the industrial computer is also connected to the communication interface. The industrial computer includes a processor and a memory. The processor is used to provide computing and control capabilities, and the memory includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the vehicle cabin air tightness test bench is used to store data such as the first pressure value, the second pressure value, the simulated air pressure in the cab, and the air flow. When the computer program is executed by the processor, a vehicle sealing test method is implemented. The communication interface of the vehicle cabin air tightness test bench is used for the industrial computer to communicate with the rain test chamber or an external computer device in a wired or wireless manner.

[0132] Those skilled in the art will understand that Figure 6The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0133] In one embodiment, a vehicle interior air tightness test bench is provided, comprising a memory and a processor. The memory stores a computer program, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0134] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0135] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0136] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of relevant countries and regions.

[0137] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, database or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory may include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchains. The processor involved in the various embodiments provided herein may be, but are not limited to, a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, and the like.

[0138] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0139] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A vehicle sealing test method, characterized in that: The method is applied to a vehicle cabin air tightness test bench, wherein the vehicle cabin air tightness test bench is connected to the cab of a target vehicle via a sealed air pipe, a first pressure sensor in the cab is connected to the vehicle cabin air tightness test bench via a pressure delivery air pipe, a second pressure sensor is provided in the vehicle cabin air tightness test bench, and the target vehicle is placed in a rain test chamber. The method comprises: Acquire simulated pressure differences between the interior and exterior of the cab by simulating the target vehicle in different driving states; The air pressure in the cab is evacuated according to the simulated pressure difference between the cab and the outside, and the actual pressure difference between the cab and the outside is controlled to be the simulated pressure difference between the cab and the outside, so as to simulate a state in which there is a pressure difference between the cab and the outside when the target vehicle is traveling within a preset speed range, wherein the simulated pressure difference between the cab and the outside is positively correlated with the speed of the target vehicle; Obtaining a first pressure value detected by the first pressure sensor and a second pressure value detected by the second pressure sensor, and calculating a difference between the first pressure value and the second pressure value; When it is determined based on the difference that a pressure differential stability condition is satisfied, instructing the rain test chamber to control the water flow of the water pump to place the target vehicle in a rain environment for a vehicle sealing test; The simulated pressure difference between the inside and outside of the cab is calculated based on the driving speed and the ambient basic wind speed, and the simulated pressure difference between the inside and outside of the cab is calculated using the following formula: ； ΔP = ; Where, Simulate air pressure for the cab, is the altitude correction factor, is the ambient temperature correction coefficient, is the wind-free pressure, is the driving speed, is the ambient basic wind speed, is the speed of sound in the absence of wind, and ΔP is the simulated pressure difference between the inside and outside of the cab.

2. The method according to claim 1, characterized in that The door glass of the cab of the target vehicle is in a lowered state, and a sealing plate is installed at the window position of the cab. The shape and size of the sealing plate are the same as those of the door glass, and it has a first through hole and a second through hole. The sealing air pipe passes through the first through hole and is connected to the vehicle cabin air tightness test bench, and the pressure delivery air pipe passes through the second through hole and is connected to the vehicle cabin air tightness test bench, and the pressure delivery air pipe is also connected to the second pressure sensor.

3. The method according to any one of claims 1 or 2, characterized in that The vehicle cabin air tightness test bench includes a gas flow meter connected to the sealed air pipe, and the method further includes: When the pressure difference stability condition is met, detecting the air flow rate of the air inlet of the sealed air pipe by the gas flow meter; The amount of gas leakage in the cab is calculated based on the air flow rate.

4. The method according to any one of claims 1 or 2, characterized in that The instructing the rain test chamber to control the water flow of the water pump to place the target vehicle in a rain environment for a vehicle sealing test includes: For multiple target driving speeds within the preset vehicle speed range, the rain test chamber is instructed to traverse the preset rain intensity levels in turn, and the target vehicle is rain tested according to the preset rain intensity levels traversed to simulate the working conditions of the target vehicle experiencing multiple different rainfall amounts at different target driving speeds, and the vehicle sealing test results are obtained.

5. The method according to claim 4, characterized in that The rain test chamber includes a control cabinet, a rain pipeline, multiple rain nozzles, and a liquid flow meter. The water pump is connected to the control cabinet. The rain pipeline is connected to the water pump, the multiple rain nozzles, and the liquid flow meter. The multiple rain nozzles are arranged above and around the rain test chamber. Before performing the rain test on the target vehicle according to the preset rain intensity level traversed, the method further includes: Instructing the control cabinet of the rain test chamber to control the water pump to supply water to the rain pipeline; Instructing the liquid flow meter to detect the water flow in the shower pipe; Instruct the control cabinet to obtain the detected water flow in the rain pipe, calculate the rain intensity in the rain test chamber according to the water flow in the rain pipe, and continue for a preset time period when the rain intensity reaches the preset rain intensity level traversed.

6. A vehicle sealing test system, characterized in that: The system comprises: The vehicle cabin air tightness test bench is connected to the cab of the target vehicle through a sealed air pipe. The first pressure sensor in the cab is connected to the vehicle cabin air tightness test bench through a pressure delivery air pipe. The vehicle cabin air tightness test bench is provided with a second pressure sensor. The vehicle cabin air tightness test bench is used to: obtain a simulated pressure difference between the inside and outside of the cab by simulating different driving conditions of the target vehicle; evacuate the air pressure in the cab according to the simulated pressure difference between the inside and outside of the cab, and control the actual pressure difference between the inside and outside of the cab to be the simulated pressure difference between the inside and outside of the cab, so as to simulate a state in which a pressure difference exists between the inside and outside of the cab when the target vehicle is traveling within a preset speed range, wherein the simulated pressure difference between the inside and outside of the cab is positively correlated with the driving speed of the target vehicle; obtain a first pressure value detected by the first pressure sensor and a second pressure value detected by the second pressure sensor, and calculate the difference between the first pressure value and the second pressure value; a rain test chamber containing the target vehicle, and when it is determined based on the difference that the pressure differential stability condition is met, the rain test chamber is used to control the water flow of the water pump to place the target vehicle in a rain environment for a vehicle sealing test; The simulated pressure difference between the inside and outside of the cab is calculated based on the driving speed and the ambient basic wind speed, and the simulated pressure difference between the inside and outside of the cab is calculated using the following formula: ； ΔP = ; Where, Simulate air pressure for the cab, is the altitude correction factor, is the ambient temperature correction coefficient, is the wind-free pressure, is the driving speed, is the ambient basic wind speed, is the speed of sound in the absence of wind, and ΔP is the simulated pressure difference between the inside and outside of the cab.

7. A vehicle sealing test device, characterized in that: Applied to a vehicle cabin air tightness test bench, the vehicle cabin air tightness test bench is connected to the cab of a target vehicle via a sealed air pipe, a first pressure sensor in the cab is connected to the vehicle cabin air tightness test bench via a pressure delivery air pipe, a second pressure sensor is provided in the vehicle cabin air tightness test bench, and the target vehicle is placed in a rain test chamber. The device comprises: An acquisition module is used to obtain a simulated pressure difference between the inside and outside of the cab obtained by simulating the target vehicle in different driving states; a control module, configured to evacuate the air pressure in the cab according to the simulated pressure differential between the cab and the outside, and control the actual pressure differential between the cab and the outside to be the simulated pressure differential between the cab and the outside, so as to simulate a state in which a pressure differential exists between the cab and the outside when the target vehicle is traveling within a preset speed range, wherein the simulated pressure differential between the cab and the outside is positively correlated with the speed of the target vehicle; a calculation module, configured to obtain a first pressure value detected by the first pressure sensor and a second pressure value detected by the second pressure sensor, and calculate a difference between the first pressure value and the second pressure value; an indication module, configured to, when it is determined based on the difference that a pressure differential stability condition is satisfied, instruct the rain test chamber to control the water flow of a water pump, so as to place the target vehicle in a rain environment for a vehicle sealing test; The simulated pressure difference between the inside and outside of the cab is calculated based on the driving speed and the ambient basic wind speed, and the simulated pressure difference between the inside and outside of the cab is calculated using the following formula: ； ΔP = ; Where, Simulate air pressure for the cab, is the altitude correction factor, is the ambient temperature correction coefficient, is the wind-free pressure, is the driving speed, is the ambient basic wind speed, is the speed of sound in the absence of wind, and ΔP is the simulated pressure difference between the inside and outside of the cab.

8. A vehicle interior air tightness test bench, characterized in that: The method comprises a memory and a processor, wherein the memory stores a computer program, and is characterized in that when the processor executes the computer program, the steps of the method according to any one of claims 1 to 5 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

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