A method and apparatus for testing the oil pump flow rate of an EDU assembly.

Abstract

This invention provides a method for testing the flow rate of an oil pump in an EDU assembly. The method includes: measuring the first inlet pressure and the first outlet pressure of the oil pump in the EDU assembly at a first rotational speed; adjusting the second inlet pressure and the second outlet pressure of the test oil pump in the testing device at the first rotational speed so that the second inlet pressure equals the first inlet pressure and the second outlet pressure equals the first outlet pressure; and measuring the flow rate of the fluid in the test oil pump in the testing device at the first rotational speed to obtain the actual flow rate of the oil pump in the EDU assembly. The oil pump flow rate testing method provided by this invention can accurately test the flow rate of the oil pump within the EDU assembly housing, providing real data support for EDU assembly operating condition calibration and data simulation.

Description

Technical Field

[0001] This invention relates to the field of vehicle design, and more particularly to a method and apparatus for testing the oil pump flow rate of an EDU assembly. Background Technology

[0002] As a component of the EDU assembly, the oil pump's flow rate under actual operating conditions is difficult to measure after the EDU assembly is assembled. Generally, the flow rate under actual operating conditions is calibrated by testing the oil pump separately, or by using single motor data to calibrate the flow rate of the oil cooler. However, since the above calibration methods do not take into account the influence of actual operating conditions, and different oil viscosity indicators will vary, they may not be suitable for the current oil usage scenarios. Therefore, calibrating the oil pump's flow rate under actual operating conditions using the above methods will result in a large deviation.

[0003] Furthermore, due to errors in the calibrated oil pump flow rate in the EDU assembly, the required feedback data cannot be accurately provided when conducting thermal simulation tests on the EDU assembly.

[0004] In view of this, the present invention is proposed to at least partially solve the technical problems existing in the prior art. Summary of the Invention

[0005] This application provides a method and apparatus for testing the oil pump flow rate of an EDU assembly, in order to solve the technical problem that the calibrated flow rate and the actual flow rate of the oil pump in the existing EDU assembly deviate from each other.

[0006] This invention provides a method for testing the oil pump flow rate of an EDU assembly, the method comprising:

[0007] Measure the pressure at the first inlet and the first outlet of the oil pump in the EDU assembly at the first speed.

[0008] Adjust the second inlet pressure and the second outlet pressure of the test oil pump of the test device at the first speed so that the second inlet pressure is equal to the first inlet pressure and the second outlet pressure is equal to the first outlet pressure;

[0009] The flow rate of the fluid in the test oil pump of the measurement and testing device at the first rotational speed is obtained to obtain the actual flow rate of the oil pump of the EDU assembly.

[0010] Preferably, measuring the first inlet pressure and the first outlet pressure of the oil pump of the EDU assembly at a first speed includes:

[0011] Measure the initial pressure at the first oil inlet of the EDU assembly; if the initial pressure is less than a preset threshold, measure the pressure at the first oil inlet and the pressure at the first oil outlet of the oil pump of the EDU assembly at the first speed.

[0012] Preferably, the EDU assembly includes an oil filter, which is located upstream of and connected to the first oil inlet. The inlet of the oil filter is connected to the reducer oil chamber of the EDU assembly. Measuring the initial pressure at the first oil inlet of the EDU assembly includes:

[0013] Connect the first oil outlet of the EDU assembly to the reducer oil chamber of the EDU assembly so that the pressure at the first oil outlet is equal to the inlet pressure of the oil filter; measure the initial pressure at the first oil inlet.

[0014] Preferably, obtaining the first inlet pressure and the first outlet pressure of the oil pump of the EDU assembly at the first speed includes:

[0015] If the initial pressure is greater than or equal to the preset threshold, change the type of oil filter until the initial pressure is less than the preset threshold.

[0016] Preferably, the flow rate of the test oil pump in the measuring and testing device at the first rotational speed is used to obtain the actual flow rate of the oil pump in the EDU assembly, including:

[0017] The actual flow rate of the oil pump in the EDU assembly is obtained by measuring the flow rate of the fluid at the first rotational speed and within a preset time period using measuring instruments.

[0018] Preferably, the actual flow rate of the oil pump in the EDU assembly is obtained by measuring the flow rate of the fluid at a first rotational speed and within a preset time period using a measuring instrument and testing device, including:

[0019] The flow rate of the test oil pump of the test device was measured multiple times within a preset time period using measuring instruments to obtain multiple measurement values;

[0020] After the preset number of measurements is reached, the average value of multiple measurements is calculated to obtain the actual flow rate of the oil pump in the EDU assembly.

[0021] Preferably, the measuring tool is a measuring cup.

[0022] Preferably, the second oil outlet of the testing device is equipped with a flow meter, and the oil pump flow test method further includes:

[0023] Obtain the flow meter reading; calibrate the flow meter based on the actual flow rate.

[0024] Preferably, the oil pump flow test method further includes:

[0025] The fluid temperature is changed, and the flow rate of the fluid in the test oil pump of the test device at the first rotational speed is measured.

[0026] Preferably, the oil pump flow test method further includes:

[0027] The flow rate of the fluid in the test pump of the test device at a second rotational speed is measured under varying fluid temperature conditions.

[0028] For any of the above-mentioned methods for testing the oil pump flow rate of an EDU assembly, the present invention also provides a corresponding testing apparatus including:

[0029] The oil supply unit is used to store fluid;

[0030] The test oil pump has a second oil inlet that is connected to the oil supply unit and is used to draw fluid from the oil supply unit.

[0031] The first pressure sensor is used to measure the pressure at the second oil inlet.

[0032] The second pressure sensor is used to measure the pressure at the second oil outlet.

[0033] The regulating unit is used to regulate the second inlet pressure and the second outlet pressure of the test oil pump so that the second inlet pressure is equal to the first inlet pressure and the second outlet pressure is equal to the first outlet pressure.

[0034] Preferred,

[0035] The testing device also includes a first test pipeline and a second test pipeline, which are respectively located on the second inlet side and the second outlet side of the test oil pump.

[0036] The first test line is equipped with a first pressure sensor, and the second test line is equipped with a second pressure sensor.

[0037] Preferred,

[0038] The test oil pump of the testing device is the oil pump of the EDU assembly;

[0039] The testing device also includes a first test line, a second test line, and a third test line;

[0040] The first and second test lines are oil lines of the EDU assembly, and the end of the second test line away from the oil pump of the EDU assembly is closed.

[0041] The third test pipeline is located at the second oil outlet side of the test oil pump and is connected to the first test pipeline. The first test pipeline and the third test pipeline are respectively equipped with a first pressure sensor and a second pressure sensor.

[0042] In summary, this invention provides a method for testing the oil pump flow rate of an EDU assembly. This method includes: measuring the first inlet pressure and the first outlet pressure of the oil pump in the EDU assembly at a first rotational speed; adjusting the second inlet pressure and the second outlet pressure of the test oil pump in the testing device at the first rotational speed so that the second inlet pressure equals the first inlet pressure and the second outlet pressure equals the first outlet pressure; and measuring the flow rate of the fluid in the test oil pump in the testing device at the first rotational speed to obtain the actual flow rate of the oil pump in the EDU assembly. The oil pump flow rate testing method provided by this invention can accurately test the flow rate of the oil pump within the EDU assembly housing, providing real data support for EDU assembly operating condition calibration and data simulation. Attached Figure Description

[0043] To more clearly illustrate the specific embodiments of this application or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 A flowchart of an oil pump flow test method for an EDU assembly is provided as an embodiment of the present invention;

[0045] Figure 2 A schematic diagram of the oil circuit of an EDU assembly is provided for an embodiment of the present invention;

[0046] Figure 3 This is a schematic diagram of the oil circuit fixture of a testing device provided for an embodiment of the present invention. Detailed Implementation

[0047] To make the above and other features and advantages of the present invention clearer, the invention will be further described below with reference to the accompanying drawings. It should be understood that the specific embodiments given herein are for the purpose of explanation to those skilled in the art and are exemplary only, not restrictive.

[0048] In the following description, numerous specific details are set forth to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the specific details are not required to practice the invention. In other instances, well-known steps or operations have not been described in detail to avoid obscuring the invention.

[0049] This addresses the technical issue of discrepancies between the rated flow rate and the actual flow rate of the oil pump in existing EDU assemblies.

[0050] See Figure 1This invention provides a method for testing the oil pump flow rate of an EDU assembly, the method comprising:

[0051] S110, measures the first inlet pressure and the first outlet pressure of the oil pump of the EDU assembly at the first speed;

[0052] See Figure 2 First, place the assembly horizontally in a constant temperature chamber, where the temperature can be set to 25℃. Based on the installation position of the oil pump in the EDU assembly, install pressure sensors in the oil pump inlet and outlet pipes. Inject the lubricating oil into the EDU assembly according to the design requirements, set the oil pump to its rated speed, and collect the negative pressure at the inlet (first inlet pressure) and the positive pressure at the outlet (first outlet pressure).

[0053] S120, Adjust the second inlet pressure and the second outlet pressure of the test oil pump of the test device at the first speed so that the second inlet pressure is equal to the first inlet pressure and the second outlet pressure is equal to the first outlet pressure;

[0054] For details, see Figure 3 After measuring the first inlet and first outlet pressures of the EDU assembly, the flow rate of lubricating oil in the pipeline can be adjusted using the outlet valve installed on the outlet side of the test oil pump. Based on the measured first inlet and first outlet pressures of the EDU assembly, the test device can be adjusted to achieve the corresponding second inlet and second outlet pressures. When adjusting the two pressures of the test device, it is necessary to ensure that the rotational speed of the test oil pump and the ambient temperature are the same as those when measuring the two pressures of the EDU assembly, and the pipe diameter of the test device and the lubricating oil used for the test should also be the same.

[0055] S130, the flow rate of the fluid in the test oil pump of the measurement and testing device at the first speed is obtained to obtain the actual flow rate of the oil pump of the EDU assembly.

[0056] Specifically, under the condition that the operating conditions of the test device and the EDU assembly are the same, the actual flow rate of the oil pump of the EDU assembly can be obtained by measuring the flow rate of the fluid in the test oil pump of the test device at the first speed.

[0057] It should be noted that, see Figure 2Due to structural limitations of the EDU assembly, it is inconvenient to install flow meters and other instruments to directly measure flow rate. Furthermore, it is difficult to accurately calculate the flow rate based solely on the relationship between flow rate, pipe diameter, and pressure. The present invention simplifies the calculation formula by considering that all pressure energy is converted into momentum, leading to the expression for the relationship between flow rate, pipe diameter, and pressure: Q=πR^2√(2P / ρ), where P=(1 / 2)ρv^2, from which v=√(2P / ρ) can be derived. Q is the flow rate, R is the pipe inner diameter, P is the pressure, ρ is the fluid density, and v is the liquid velocity. The symbol √ represents the square root. As can be seen from the expression, if the pipe diameter and fluid density are the same, then the same pressure is sufficient to obtain the same flow rate. Therefore, the oil pump flow rate measured under the same conditions in the testing device of this invention is the oil pump flow rate of the EDU assembly.

[0058] This allows for accurate testing of the oil pump flow rate within the EDU assembly housing, providing real data support for assembly operating condition calibration and data simulation.

[0059] In some embodiments, prior to S110, a set of data needs to be verified by measuring the initial pressure at the first oil inlet of the EDU assembly, see [link to relevant documentation]. Figure 2 This is because an oil filter is typically installed on the inlet side of the EDU assembly to remove metal dust and other mechanical impurities from the wear of components in the hydraulic system, keeping the pipeline clean. Therefore, before testing, it is necessary to determine whether the oil filter is clogged or whether the oil filter selection is correct. Specifically, it is necessary to determine whether the oil filter's pressure resistance (initial pressure at the first inlet) is less than a preset threshold. This prevents excessive negative pressure in the pipeline due to oil filter clogging or incorrect selection from affecting the actual calibration of the pump. Therefore, with the initial pressure less than the preset threshold, the first inlet pressure and first outlet pressure of the EDU assembly's oil pump at the first speed are measured.

[0060] Specifically, prior to S110, the EDU assembly was installed normally at the oil inlet. An oil filter was installed at the front end of the oil pump's oil inlet, and the pressure sensor at the oil outlet was removed. A conduit was used to directly lead the oil back to the reducer's oil chamber to balance the internal and external pressures. The oil pump was then run, and the pressure resistance of the oil filter was tested. At this time, the reading of the pressure sensor on the oil inlet side was the pressure resistance of the oil filter.

[0061] In some embodiments, S130 includes:

[0062] The flow rate of the fluid in the test oil pump at a first rotational speed within a preset time period is measured using a measuring instrument to obtain the actual flow rate of the oil pump in the EDU assembly. The measuring instrument can be a measuring cup. Furthermore, to improve measurement accuracy, the flow rate of the fluid in the test oil pump of the testing device can be measured multiple times within the preset time period using the measuring instrument, obtaining multiple measurement values. After the preset number of measurements is reached, the average of the multiple measurement values ​​is calculated to obtain the actual flow rate of the oil pump in the EDU assembly.

[0063] Specifically, the measuring cup method is used to test the flow rate of the oil pump. After the lubricating oil passes through the outlet valve, the oil pipe is placed into the oil container. When timing begins, the measuring cup is used to collect the oil coming out of the pipe, and the preset time is recorded. The preset time can be 30 seconds or 1 minute. Furthermore, to ensure the accuracy of the test data, the oil volume in the measuring cup can be recorded five times within the preset time. Using the measuring cup method to test the oil pump flow rate avoids errors caused by the calibration of various flow meters and other electronic products, making the accuracy more reliable.

[0064] In addition, based on the solution provided by this invention, a flow sensor (flow meter) of the same diameter can be installed on the oil outlet side of the testing device. The data collected by the sensor can be compared with the accurate data measured by the measuring cup method to achieve the purpose of calibrating the flow meter.

[0065] In some embodiments, after measuring the actual flow rate of the oil pump of the EDU assembly at a preset temperature (e.g., 25°C) and a preset speed (e.g., a first speed) using the scheme provided by the present invention, the temperature of the fluid (lubricating oil) can be changed to measure the flow rate of the fluid in the test oil pump of the test device at the first speed.

[0066] Furthermore, the flow rate of the test oil pump at the second rotational speed can be measured while the fluid temperature is changed. This provides more comprehensive and realistic data support for assembly operating condition calibration and data simulation.

[0067] In addition to the oil pump flow rate testing method provided by this invention, this invention also provides a corresponding testing device, which includes...

[0068] The oil supply unit is used to store fluid;

[0069] The test oil pump has a second oil inlet that is connected to the oil supply unit and is used to draw fluid from the oil supply unit.

[0070] The first pressure sensor is used to measure the pressure at the second oil inlet.

[0071] The second pressure sensor is used to measure the pressure at the second oil outlet.

[0072] The regulating unit is used to regulate the second inlet pressure and the second outlet pressure of the test oil pump so that the second inlet pressure is equal to the first inlet pressure and the second outlet pressure is equal to the first outlet pressure.

[0073] For details, see Figure 3 , Figure 3 The oil storage tank in the middle is equivalent to an oil supply unit, used to store fluid (lubricating oil); Figure 3 The oil pump in the EDU assembly is equivalent to a test oil pump. A first test line is located between the oil filter and the oil pump's inlet (equivalent to a second inlet). This first test line is equipped with a pressure gauge (equivalent to a first pressure sensor) to measure the pressure at the second inlet. A second test line is connected to the oil pump's outlet (equivalent to a second outlet) to connect to the first test line. This second test line is equipped with a pressure gauge (equivalent to a second pressure sensor) and a regulating valve (equivalent to a regulating unit). The second pressure sensor measures the pressure at the second outlet. The regulating unit adjusts the pressure at the second inlet and outlet of the test oil pump to ensure that the second inlet pressure equals the first inlet pressure, and the second outlet pressure equals the first outlet pressure. Therefore, the actual flow rate of the EDU assembly's oil pump can be measured by using a measuring instrument (such as a measuring cup) to measure the oil volume of the test oil pump.

[0074] In some embodiments, without the aforementioned device, the EDU assembly housing can be modified into a testing device (not shown in the figure), the oil pump of the EDU assembly serves as the test oil pump of the testing device; the reducer cavity is equivalent to the oil supply unit; the testing device further includes a first test line, a second test line, and a third test line; the first and second test lines are oil lines of the EDU assembly, and the end of the second test line away from the oil pump of the EDU assembly is closed; the third test line is located at the second oil outlet side of the test oil pump and is connected to the first test line, and the first and third test lines are respectively equipped with a first pressure sensor and a second pressure sensor.

[0075] Specifically, based on the EDU assembly housing, the oil outlet leading to the motor (equivalent to the second test line) is blocked, and a bypass oil line (equivalent to the third test line) is installed. A pressure gauge (equivalent to the second pressure sensor) and a valve for adjusting the oil outlet pressure (equivalent to the regulating unit) are installed on the oil line. Since the oil pump inlet line of the EDU assembly already has a pressure gauge (equivalent to the first pressure sensor), the EDU assembly housing can be modified into a corresponding testing device.

[0076] In summary, the solution provided by this invention has the following advantages:

[0077] 1) Easy to install: It can be tested by simply modifying the assembly, or by making an oil pump testing device, and the device design is simple.

[0078] 2) Simple operation: The sensor uses a common pressure gauge, and the measuring instrument can be a measuring cup. The operation is simple and the data acquisition is simple and convenient.

[0079] 3) Due to the simple structure of the testing device, it is easy to move it to high-temperature and low-temperature environments to conduct environmental oil pump related tests.

[0080] 4) The testing device has a wide range of applications: In addition to testing the oil pump flow rate of the EDU assembly, it can also verify the oil filter flow resistance, the use of housings with different oil supply pressures, and calibrate the flow meters on the equipment.

[0081] The technical features described above can be combined arbitrarily. Although not all possible combinations of these technical features are described, any combination of these technical features should be considered to be covered by this specification, provided that such combination does not contain contradictions.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for testing the oil pump flow rate of an EDU assembly, characterized in that, The oil pump flow rate testing method includes: Measure the pressure at the first inlet and the first outlet of the oil pump in the EDU assembly at the first speed. Adjust the second inlet pressure and the second outlet pressure of the test oil pump of the test device at the first speed so that the second inlet pressure is equal to the first inlet pressure and the second outlet pressure is equal to the first outlet pressure; The flow rate of the fluid in the test oil pump of the test device at the first rotational speed is measured to obtain the actual flow rate of the oil pump of the EDU assembly; The measurement of the first inlet pressure and the first outlet pressure of the oil pump of the EDU assembly at the first speed includes: Measure the initial pressure at the first oil inlet of the EDU assembly; When the initial pressure is less than a preset threshold, the first inlet pressure and the first outlet pressure of the oil pump of the EDU assembly at the first speed are measured. The EDU assembly includes an oil filter, which is disposed upstream of and connected to the first oil inlet. The inlet of the oil filter is connected to the reducer oil chamber of the EDU assembly. Measuring the initial pressure at the first oil inlet of the EDU assembly includes: The first oil outlet of the EDU assembly is connected to the reducer oil chamber of the EDU assembly so that the pressure at the first oil outlet is equal to the inlet pressure of the oil filter; Measure the initial pressure at the first oil inlet.

2. The method for testing the oil pump flow rate of the EDU assembly according to claim 1, characterized in that, The measurement of the fluid flow rate of the test oil pump of the testing device at a first rotational speed to obtain the actual flow rate of the oil pump of the EDU assembly includes using a measuring instrument to measure the fluid flow rate of the test oil pump of the testing device at the first rotational speed within a preset time period to obtain the actual flow rate of the oil pump of the EDU assembly, specifically including: The flow rate of the test oil pump of the test device was measured multiple times within a preset time period using measuring instruments to obtain multiple measurement values; After the number of measurements reaches a preset number, the average value of multiple measurements is calculated to obtain the actual flow rate of the oil pump in the EDU assembly.

3. The method for testing the oil pump flow rate of the EDU assembly according to claim 1, characterized in that, The second oil outlet of the testing device is equipped with a flow meter, and the oil pump flow test method further includes: Obtain the reading of the flow meter; The flow meter is calibrated based on the actual flow rate.

4. The method for testing the oil pump flow rate of the EDU assembly according to claim 1, characterized in that, The oil pump flow test method also includes: The temperature of the fluid is changed, and the flow rate of the fluid in the test oil pump of the test device at the first rotational speed is measured.

5. The method for testing the oil pump flow rate of the EDU assembly according to claim 4, characterized in that, The oil pump flow test method also includes: The flow rate of the fluid in the test pump of the test device at a second rotational speed is measured while the temperature of the fluid is changed.

6. The method for testing the oil pump flow rate of the EDU assembly according to any one of claims 1-5, characterized in that, The testing apparatus includes: The oil supply unit is used to store fluid; The test oil pump has a second oil inlet that is connected to the oil supply unit and is used to draw fluid from the oil supply unit. The first pressure sensor is used to measure the pressure at the second oil inlet. The second pressure sensor is used to measure the pressure at the second oil outlet. The adjustment unit is used to adjust the second inlet pressure and the second outlet pressure of the test oil pump so that the second inlet pressure is equal to the first inlet pressure and the second outlet pressure is equal to the first outlet pressure.

7. The method for testing the oil pump flow rate of the EDU assembly according to claim 6, characterized in that, The testing device further includes a first testing pipeline and a second testing pipeline, which are respectively disposed on the second oil inlet side and the second oil outlet side of the testing oil pump. The first test pipeline is equipped with the first pressure sensor, and the second test pipeline is equipped with the second pressure sensor.

8. The method for testing the oil pump flow rate of the EDU assembly according to claim 6, characterized in that, The test oil pump of the test device is the oil pump of the EDU assembly; The testing device further includes a first testing pipeline, a second testing pipeline, and a third testing pipeline; The first test line and the second test line are oil lines of the EDU assembly, and the end of the second test line away from the oil pump of the EDU assembly is closed. The third test pipeline is located at the second oil outlet side of the test oil pump and is connected to the first test pipeline. The first test pipeline and the third test pipeline are respectively equipped with the first pressure sensor and the second pressure sensor.

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