Anti-air-inlet liquid level detection device and method for expansion water tank of hybrid power cooling system

Abstract

The invention discloses an anti-air inlet liquid level detection device for an expansion water tank of a hybrid power cooling system, belongs to the technical field of automobile testing, and solves the problem that the anti-air inlet liquid level of the expansion water tank is difficult to detect independently at present. The device comprises an expansion water tank and further comprises a controller and a liquid storage tank, a first degassing connecting pipe and a second degassing connecting pipe which are arranged in parallel are arranged between the liquid storage tank and the expansion water tank, and a first flowmeter, a first valve and a first driving pump are installed on the first degassing connecting pipe. A second flowmeter, a second valve and a second driving pump are respectively mounted on the second degassing connecting pipe, a water replenishing pipe and a water drain valve are respectively mounted at the bottom of the expansion water tank, the water replenishing pipe is communicated with the liquid storage tank, and a third flowmeter, a third valve, an observation window and a third driving pump are sequentially mounted on the water replenishing pipe along one end of the liquid storage tank. The invention further discloses an anti-air-inlet liquid level detection method for the expansion water tank of the hybrid power cooling system, and the anti-air-inlet performance of a single part of the expansion water tank is detected.

Description

Technical Field

[0001] This invention relates to the field of automotive testing technology, and more specifically, to a device and method for detecting the anti-intake liquid level in the expansion tank of a hybrid power cooling system. Background Technology

[0002] In hybrid electric vehicles, the positive pressure cooling system is a crucial component. The expansion tank, a vital part of this system, functions to replenish coolant, pressurize the engine, and separate gases. It is typically located at the highest point of the engine, with the coolant replenishment point at its lowest point. During operation, when the coolant level in the expansion tank is low, the flow rate of coolant from the tank to the engine through the large-diameter, perforated outlet and connecting pipes can be high. This high flow rate may create vortices at the outlet, drawing air into the water pump inlet.

[0003] Therefore, in practical use, it is generally necessary to confirm the minimum liquid level at which air is entrained to avoid the system being affected by a large amount of air, which could impact the efficiency of the water pump, heat exchanger, or other accessories in the cooling system, and consequently affect the service life of the entire vehicle. However, there is currently no device specifically designed to detect the air-entrained liquid level in the expansion tank.

[0004] Therefore, there is an urgent need to develop and design a device and method for detecting the anti-air intake liquid level in the expansion tank of a hybrid power cooling system to solve the above problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the above-mentioned shortcomings of the prior art. The purpose of the present invention is to provide a device for detecting the anti-intake liquid level of the expansion tank of a hybrid power cooling system, which realizes the detection of the anti-intake liquid level performance of the expansion tank in the state of an independent component, reduces the rectification cost of verification failure after being integrated into the whole vehicle, and at the same time reduces the safety risks caused by operation on the whole vehicle.

[0006] The second objective of this invention is to provide a method for detecting the anti-air intake liquid level of an expansion tank in a hybrid power cooling system, thereby enabling the detection of the anti-air intake performance of individual components of the expansion tank.

[0007] To achieve the first objective mentioned above, this invention provides a hybrid power cooling system expansion tank anti-air intake liquid level detection device, including an expansion tank with a filling port at the top, a controller, and a storage tank. A first degassing connection pipe and a second degassing connection pipe are arranged in parallel between the storage tank and the expansion tank. Both ends of the first and second degassing connection pipes are connected to the bottom of the storage tank and the top of the expansion tank, respectively. A first flow meter, a first valve, and a first drive pump are installed on the first degassing connection pipe, and a second flow meter, a second valve, and a second drive pump are installed on the second degassing connection pipe. A water supply pipe and a drain valve are installed at the bottom of the expansion tank. The water supply pipe is connected to the storage tank, and a third flow meter, a third valve, an observation window, and a third drive pump are sequentially installed along one end of the storage tank on the water supply pipe. The first flow meter, first valve, first drive pump, second flow meter, second valve, second drive pump, third flow meter, third valve, third drive pump, and drain valve are all electrically connected to the controller.

[0008] As a further improvement, a sealing cap is threaded onto the filling port.

[0009] Furthermore, a first pressure sensor is also installed on the expansion tank, and the first pressure sensor is electrically connected to the controller.

[0010] Furthermore, a second pressure sensor is also installed on the water supply pipe between the third flow meter and the expansion tank, and the second pressure sensor is electrically connected to the controller.

[0011] Furthermore, filters are installed on the first degassing connection pipe between the first drive pump and the storage tank, and on the second degassing connection pipe between the second drive pump and the storage tank.

[0012] Furthermore, the detection device also includes a support and a linear actuator, both of which are located between the water supply pipe and the water discharge valve. The expansion tank is hinged to the top of the support. One end of the linear actuator is hinged to the support, and the other end is hinged to the bottom of the expansion tank. The linear actuator is electrically connected to the controller.

[0013] Furthermore, a support is provided at the bottom of the expansion tank between the water supply pipe and the water discharge valve, and the top of the support and the other end of the linear actuator are hinged to the bottom of the support.

[0014] To achieve the second objective mentioned above, the present invention provides a detection method for an anti-intake liquid level detection device for an expansion tank in a hybrid power cooling system, the detection method comprising the following steps: S1. The controller controls the opening of the first flow meter, the first valve, the first drive pump, the second flow meter, the second valve, the second drive pump, the third flow meter, the third valve, and the third drive pump; S2. Based on the flow data under the target vehicle's operating conditions or the CAE cooling system simulation calculation data, adjust the opening of the first valve, the second valve, and the third valve so that the flow values ​​of the first flow meter, the second flow meter, and the third flow meter match the flow values ​​under the target vehicle's operating conditions. S3. Add water through the filling port until the liquid level in the expansion tank rises to the MAX line; S4. Open the drain valve to release water using the controller and observe the fluid status in the observation window until bubbles appear in the observation window, then close the drain valve. S5. Close the first drive pump, the second drive pump, the third drive pump, and the first valve, the second valve, and the third valve. After the liquid level in the expansion tank stabilizes, record the liquid level position in the expansion tank at this time. The liquid level in the expansion tank at this time is the anti-air intake liquid level of the expansion tank.

[0015] Furthermore, when the drain valve releases water, the liquid level in the expansion tank drops at a rate less than or equal to 0.5 mm / s.

[0016] Furthermore, the detection method further includes step S0, which, prior to step S1, involves the following specific steps: The linear actuator is activated by the controller, and the linear actuator extends and retracts to tilt the expansion tank until the tilt angle of the expansion tank is the same as the tilt angle of the target vehicle in use.

[0017] Beneficial effects Compared with the prior art, the present invention has the following advantages: The detection device of this invention, by setting up two degassing connection pipes and a water supply pipe, and installing components such as flow meters, valves and water pumps on the pipelines, simulates the flow and pressure of local pipelines in the cooling system of hybrid vehicles. It realizes the detection of the expansion tank's anti-intake liquid level performance in the state of independent components. During the vehicle matching design stage, the expansion tank can be adapted and selected according to the flow and pressure boundaries of each subsystem, and the anti-intake liquid level of the expansion tank can be detected. This exposes systemic risks in the early stage of matching, allowing for timely rectification, ensuring project delivery nodes, reducing the rectification cost of verification failure after matching to the vehicle, and reducing the safety risks brought about by operation on the vehicle. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a signal block diagram of the present invention.

[0019] The components are: 1-expansion tank, 2-filling port, 3-controller, 4-storage tank, 5-first degassing connection pipe, 6-second degassing connection pipe, 7-first flow meter, 8-first valve, 9-first drive pump, 10-second flow meter, 11-second valve, 12-second drive pump, 13-water supply pipe, 14-water discharge valve, 15-third flow meter, 16-third valve, 17-observation window, 18-third drive pump, 19-sealing cap, 20-first pressure sensor, 21-second pressure sensor, 22-filter, 23-support, 24-linear actuator, 25-bracket. Detailed Implementation

[0020] The present invention will be further described below with reference to specific embodiments shown in the accompanying drawings.

[0021] See Figure 1-2 This invention discloses a hybrid power cooling system expansion tank anti-intake liquid level detection device, comprising an expansion tank 1, wherein the top of the expansion tank 1 is provided with a filling port 2 for replenishing water to the expansion tank 1. The detection device also includes a controller 3 and a storage tank 4, wherein a first degassing connection pipe 5 and a second degassing connection pipe 6 are arranged in parallel between the storage tank 4 and the expansion tank 1, serving as degassing connection pipes simulating a vehicle. Both ends of the first degassing connection pipe 5 and the second degassing connection pipe 6 are respectively connected to the bottom of the storage tank 4 and the top of the expansion tank 1, thereby providing circulating water to the expansion tank 1. A first flow meter 7, a first valve 8, and a first drive pump 9 are respectively installed on the first degassing connection pipe 5 for controlling the flow rate of the first degassing connection pipe 5, and a second flow meter 1 is respectively installed on the second degassing connection pipe 6. 0. The second valve 11 and the second drive pump 12 are used to control the flow rate of the second degassing connection pipe 6. A water supply pipe 13 and a drain valve 14 are installed at the bottom of the expansion tank 1. The water supply pipe 13 is connected to the storage tank 4. A third flow meter 15, a third valve 16, an observation window 17 and a third drive pump 18 are installed sequentially along one end of the water supply pipe 13 to control the outlet flow rate of the expansion tank 1. The observation window 17 is a transparent window to facilitate observation of whether air is trapped in the water supply pipe 13. The first flow meter 7, the first valve 8, the first drive pump 9, the second flow meter 10, the second valve 11, the second drive pump 12, the third flow meter 15, the third valve 16, the third drive pump 18 and the drain valve 14 are all electrically connected to the controller 3 to facilitate the opening or closing of each component.

[0022] Preferably, a sealing cap 19 is threaded onto the filling port 2, which ensures the airtightness of the expansion tank 1 while facilitating disassembly and water filling.

[0023] Preferably, a first pressure sensor 20 is also installed on the expansion tank 1. The first pressure sensor 20 is electrically connected to the controller 3 and is used to monitor the pressure inside the expansion tank 1 in real time.

[0024] Preferably, a second pressure sensor 21 is also installed on the water supply pipe 13 between the third flow meter 15 and the expansion tank 1. The second pressure sensor 21 is electrically connected to the controller 3 and is used to monitor the pressure in the water supply pipe 13 in real time.

[0025] Preferably, filters 22 are installed on the first degassing connection pipe 5 between the first drive pump 9 and the storage tank 4, and on the second degassing connection pipe 6 between the second drive pump 12 and the storage tank 4, to filter impurities in the water.

[0026] Preferably, the detection device in this embodiment further includes a support 23 and a linear actuator 24. The support 23 and the linear actuator 24 are both located between the water supply pipe 13 and the water drain valve 14. The expansion tank 1 is hinged to the top of the support 23. The linear actuator 24 is a hydraulic cylinder, an electric push rod, or a linear guide. One end of the linear actuator 24 is hinged to the support 23, and the other end is hinged to the bottom of the expansion tank 1. The linear actuator 24 is electrically connected to the controller 3. By using the support 23 and the linear actuator 24 to support the expansion tank 1, the tilt angle of the expansion tank 1 can be easily controlled to simulate the state of the expansion tank under the condition of the whole vehicle in use.

[0027] Preferably, a bracket 25 is also provided at the bottom of the expansion tank 1 between the water supply pipe 13 and the water discharge valve 14. The top of the support 23 and the other end of the linear actuator 24 are hinged to the bottom of the bracket 25. The bracket 25 is used to connect the support 23 and the linear actuator 24 to avoid damage to the expansion tank 1. At the same time, the bracket 25 and the expansion tank 1 can be detachably connected by bolts for easy assembly and disassembly.

[0028] The present invention also provides a method for detecting the anti-intake liquid level of the expansion tank in a hybrid power cooling system, the method comprising the following steps: S1. The controller 3 controls the opening of the first flow meter 7, the first valve 8, the first drive pump 9, the second flow meter 10, the second valve 11, the second drive pump 12, the third flow meter 15, the third valve 16 and the third drive pump 18, so that the detection device can operate and simulate the working process of the expansion tank 1. S2. Based on the flow data of the target vehicle under the usage state or the CAE cooling system simulation calculation data, adjust the opening of the first valve 8, the second valve 11, and the third valve 16 so that the flow values ​​of the first flow meter 7, the second flow meter 10, and the third flow meter 15 match the flow values ​​of the target vehicle under the usage state, thereby achieving a true simulation of the operating state of the expansion tank 1 when it is used in the whole vehicle. S3. Add water through filling port 2 until the liquid level in expansion tank 1 rises to the MAX line (it should be noted that expansion tank 1 generally has a MAX line and a min line for the liquid level, while the anti-air intake liquid level line is located below the min line). S4. Open the drain valve 14 through the controller 3 to release water and observe the fluid state in the observation window 17 until bubbles appear in the observation window 17, then close the drain valve 14. S5. Close the first drive pump 9, the second drive pump 12, the third drive pump 18 and the first valve 8, the second valve 11 and the third valve 16. After the liquid level in the expansion tank 1 stabilizes, record the liquid level position in the expansion tank 1 at this time. The liquid level in the expansion tank 1 at this time is the anti-air intake liquid level of the expansion tank 1.

[0029] The detection device of this invention, by setting two degassing connection pipes and a water supply pipe 13, and installing components such as flow meters, valves and water pumps on the pipelines, simulates the flow and pressure of local pipelines in the cooling system of hybrid electric vehicles, realizing the detection of the expansion tank's anti-intake liquid level performance in the state of independent components. It can be used in the whole vehicle matching design stage to adapt and select the expansion tank according to the flow and pressure boundaries of each subsystem, detect whether the expansion tank's anti-intake liquid level is qualified, expose systemic risks in the early stage of matching, rectify them in time, ensure project delivery nodes, reduce the rectification cost of verification failure after matching to the whole vehicle, and reduce the safety risks brought about by operation on the whole vehicle.

[0030] Preferably, when water is released from the drain valve 14, the liquid level in the expansion tank 1 drops at a rate less than or equal to 0.5 mm / s. Specifically, the water release rate can be adjusted by controlling the opening and closing angle of the drain valve 14 to achieve a drop rate of less than or equal to 0.5 mm / s in the expansion tank 1, thereby avoiding excessive influence of visual observation factors on the test results.

[0031] Preferably, the detection method further includes step S0, which is performed before step S1. The specific operation process of step S0 is as follows: the linear actuator 24 is started by the controller 3, and the linear actuator 24 extends and retracts to tilt the expansion tank 1 until the tilt angle of the expansion tank 1 is the same as the tilt angle of the target vehicle under the usage state, so as to realize the state simulation of the expansion tank under the whole vehicle usage conditions, making the detection more realistic and reliable.

[0032] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention, and these will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A hybrid power cooling system expansion tank anti-air intake liquid level detection device, comprising an expansion tank (1), wherein the expansion tank (1) is provided with a filling port (2) at the top, characterized in that, It also includes a controller (3) and a storage tank (4). A first degassing connection pipe (5) and a second degassing connection pipe (6) are arranged in parallel between the storage tank (4) and the expansion tank (1). The two ends of the first degassing connection pipe (5) and the second degassing connection pipe (6) are respectively connected to the bottom of the storage tank (4) and the top of the expansion tank (1). A first flow meter (7), a first valve (8) and a first drive pump (9) are respectively installed on the first degassing connection pipe (5). A second flow meter (10), a second valve (11) and a second drive pump (12) are respectively installed on the second degassing connection pipe (6). The expansion tank ( 1) The bottom is equipped with a water supply pipe (13) and a drain valve (14). The water supply pipe (13) is connected to the storage tank (4). The water supply pipe (13) is installed along one end of the storage tank (4) with a third flow meter (15), a third valve (16), an observation window (17) and a third drive pump (18). The first flow meter (7), the first valve (8), the first drive pump (9), the second flow meter (10), the second valve (11), the second drive pump (12), the third flow meter (15), the third valve (16), the third drive pump (18), and the drain valve (14) are all electrically connected to the controller (3).

2. The hybrid power cooling system expansion tank anti-air intake liquid level detection device according to claim 1, characterized in that, A sealing cap (19) is threaded onto the filling port (2).

3. The anti-air intake liquid level detection device for the expansion tank of the hybrid power cooling system according to claim 1, characterized in that, The expansion tank (1) is also equipped with a first pressure sensor (20), which is electrically connected to the controller (3).

4. The anti-air intake liquid level detection device for the expansion tank of the hybrid power cooling system according to claim 1, characterized in that, A second pressure sensor (21) is also installed on the water supply pipe (13) between the third flow meter (15) and the expansion tank (1), and the second pressure sensor (21) is electrically connected to the controller (3).

5. The anti-air intake liquid level detection device for the expansion tank of the hybrid power cooling system according to claim 3, characterized in that, A filter (22) is installed on the first degassing connection pipe (5) between the first drive pump (9) and the storage tank (4), and on the second degassing connection pipe (6) between the second drive pump (12) and the storage tank (4).

6. The anti-air intake liquid level detection device for the expansion tank of a hybrid power cooling system according to any one of claims 1-5, characterized in that, The detection device also includes a support (23) and a linear actuator (24). The support (23) and the linear actuator (24) are both located between the water supply pipe (13) and the water discharge valve (14). The expansion tank (1) is hinged to the top of the support (23). One end of the linear actuator (24) is hinged to the support (23), and the other end is hinged to the bottom of the expansion tank (1). The linear actuator (24) is electrically connected to the controller (3).

7. The anti-intake liquid level detection device for the expansion tank of a hybrid power cooling system according to claim 6, characterized in that, The bottom of the expansion tank (1) between the water supply pipe (13) and the water discharge valve (14) is also provided with a bracket (25). The top of the support (23) and the other end of the linear actuator (24) are hinged to the bottom of the bracket (25).

8. A detection method for the anti-intake liquid level detection device of the expansion tank of a hybrid power cooling system according to claim 6, characterized in that, The detection method includes the following steps: S1. The controller (3) controls the first flow meter (7), the first valve (8), the first drive pump (9), the second flow meter (10), the second valve (11), the second drive pump (12), the third flow meter (15), the third valve (16) and the third drive pump (18) to open. S2. Based on the flow data of the target vehicle under the usage state or the CAE cooling system simulation calculation data, adjust the opening of the first valve (8), the second valve (11), and the third valve (16) so that the flow values ​​of the first flow meter (7), the second flow meter (10), and the third flow meter (15) match the flow values ​​of the target vehicle under the usage state. S3. Add water through the filling port (2) until the liquid level in the expansion tank (1) rises to the MAX line; S4. Open the drain valve (14) through the controller (3) to drain water and observe the fluid state in the observation window (17) until bubbles appear in the observation window (17), then close the drain valve (14). S5. Close the first drive pump (9), the second drive pump (12), the third drive pump (18) and the first valve (8), the second valve (11) and the third valve (16). After the liquid level in the expansion tank (1) stabilizes, record the liquid level position in the expansion tank (1) at this time. The liquid level in the expansion tank (1) at this time is the anti-air intake liquid level of the expansion tank (1).

9. The detection method according to claim 8, characterized in that, When the drain valve (14) drains water, the liquid level in the expansion tank (1) drops at a rate of less than or equal to 0.5 mm / s.

10. The detection method according to claim 8, characterized in that, The detection method further includes step S0, which is performed before step S1. The specific operation process of step S0 is as follows: The linear actuator (24) is activated by the controller (3). The linear actuator (24) extends and retracts to tilt the expansion tank (1) until the tilt angle of the expansion tank (1) is the same as the tilt angle of the target vehicle in use.

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