New energy engineering machinery electro-hydraulic power unit testing device and control method
By integrating controllers and using a closed-loop control method with multiple sensors, the problem of unstable testing of hydraulic pumps at high speeds was solved, enabling accurate testing of hydraulic pump performance and promoting technological progress in new energy engineering machinery.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-03
- Publication Date
- 2026-04-24
AI Technical Summary
Existing testing platforms are unable to accurately test the performance of hydraulic pumps at high speeds, especially under the requirements of low noise and high power density, and cannot provide reliable experimental data support. Furthermore, traditional testing methods cannot actively maintain the target inlet pressure, resulting in deviations between test results and actual working conditions.
The test device, which integrates a controller, pressure supply unit, throttle valve and multiple sensors, achieves active and precise control of the oil suction port pressure through closed-loop control, and monitors and adjusts the inlet/outlet pressure and flow rate in real time to ensure that the test conditions are consistent with the actual working conditions.
It enables accurate testing of hydraulic pump performance under high-speed operating conditions, provides reliable experimental data, and offers a reliable experimental platform for the design and optimization of high power density electro-hydraulic power units, thereby improving testing efficiency and data reliability.
Smart Images
Figure CN121917211A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of new energy engineering machinery, and in particular to a testing device and control method for an electro-hydraulic power unit of new energy engineering machinery. Background Technology
[0002] To develop efficient, green, and low-emission new energy construction machinery, electrification technology is currently a research hotspot for energy conservation and emission reduction in construction machinery. The hydraulic system is the most energy-intensive subsystem in construction machinery, and improving its energy efficiency and operational efficiency is key for OEMs to promote electrification. As core components of the hydraulic operating system of electrified construction machinery, new energy power units such as electro-hydraulic power units suffer from low integration due to the mainstream "motor-hydraulic pump" separate design, hindering innovation and energy efficiency improvements in hydraulic systems. Increasing their power density has become crucial for technological advancement.
[0003] Domestically and internationally, various integrated motor pump solutions have been developed to improve power density through increased speed and integrated design. However, these solutions have shortcomings under low- and high-speed operating conditions. With the trend towards electrification in new energy sources, low noise has become a crucial requirement for hydraulic systems. Vane pumps, due to their advantages of low flow pulsation, stable operation, and low noise, are widely used in integrated motor pump research. Integrating a double-acting vane pump into the rotor of a permanent magnet brushless DC motor can reduce size and increase power density, but issues with the pump suction port and vane tip wear arise at high speeds. Furthermore, existing vane pump testing equipment is mostly designed for conventional operating conditions and lacks high-speed performance testing and control methods. This makes it difficult to accurately test the pump's maximum speed and performance changes under controllable suction port pressure conditions, thus failing to provide experimental data for the design and optimization of high-power-density electro-hydraulic power units and other new energy power units. Summary of the Invention
[0004] The purpose of this application is to provide a testing device and control method for electro-hydraulic power units of new energy engineering machinery, which can improve the above-mentioned problems.
[0005] The embodiments of this application are implemented as follows: In a first aspect, this application provides a testing device for electro-hydraulic power units of new energy engineering machinery, used to test the maximum speed of the hydraulic pump under test at the target inlet pressure, which includes: a controller, an oil tank, a pressure supply unit, a first motor driver, a first motor, a throttle valve before the pump, a throttle valve after the pump, a pressure sensor before the pump, a pressure sensor after the pump, a flow meter, and a host computer.
[0006] The controller is configured to control the pressure supply unit to draw oil from the oil tank to the inlet of the hydraulic pump under test. The controller is also configured to control the first motor driver to drive the first motor to operate, thereby driving the hydraulic pump under test to release the oil back into the oil tank through the second liquid pipe.
[0007] The hydraulic pump under test is provided with a pre-pump pressure sensor at its inlet, which is configured to monitor the inlet pressure of the hydraulic pump under test; and a post-pump pressure sensor is provided at its outlet, which is configured to monitor the outlet pressure of the hydraulic pump under test.
[0008] The inlet of the hydraulic pump under test is connected to the oil tank via a first liquid pipe. A throttle valve is installed on the first liquid pipe, which is configured to adjust the flow rate in the first liquid pipe under the control of the controller. The outlet of the hydraulic pump under test is connected to the oil tank via a second liquid pipe. A throttle valve is installed on the second liquid pipe, which is configured to adjust the flow rate in the second liquid pipe under the control of the controller. A flow meter is also installed on the second liquid pipe to monitor the flow rate.
[0009] The host computer is configured to receive and display monitoring parameters fed back by the pre-pump pressure sensor, the post-pump pressure sensor, and the flow meter; the controller is connected to the host computer via wired or wireless means.
[0010] It is understandable that existing testing platforms are mainly designed for conventional operating conditions. When the pump suction port is operating at high speed, local low pressure, cavitation, or eddy currents can easily cause fluctuations or even instability in the inlet pressure, making it difficult to actively maintain the target inlet pressure. This results in deviations between the test results and actual high-speed operating conditions, failing to provide reliable data support for the high-speed design of high-power-density electro-hydraulic power units. The electro-hydraulic power unit testing device for new energy engineering machinery disclosed in this application mainly achieves active and precise control of the suction port pressure through an integrated controller, pressure supply unit, throttle valve, and multiple sensors. This effectively solves the problem of test instability caused by local low pressure and cavitation under high-speed operating conditions, enabling wide-speed-range performance testing of electro-hydraulic power units. The device adopts closed-loop control, which can monitor and adjust the inlet / outlet pressure and flow rate in real time, ensuring that the test conditions are highly consistent with actual operating conditions. Furthermore, data interaction and display via a host computer improve testing efficiency and data reliability. This device is specifically designed for new energy power units such as electro-hydraulic power units, providing a reliable experimental platform for the optimization of high-power-density electro-hydraulic power units and promoting technological progress in new energy engineering machinery.
[0011] In an optional embodiment of this application, the pressure supply unit includes a second motor driver, a second motor, and a pressure supply pump; the second motor driver drives the second motor to operate under the control of the controller to drive the pressure supply pump to work and draw oil from the oil tank to the inlet of the hydraulic pump under test.
[0012] In an optional embodiment of this application, the inlet of the pressure pump is connected to the oil tank via a third oil pipe, and a first filter is provided on the third oil pipe; the outlet of the pressure pump is connected to the inlet of the hydraulic pump under test via a fourth oil pipe; and a second filter is provided on the second oil pipe.
[0013] In an optional embodiment of this application, the inlet of the hydraulic pump under test is connected to the oil tank via a fifth liquid pipe, and an overflow valve is provided on the fifth liquid pipe to prevent the hydraulic pressure at the inlet of the hydraulic pump under test from exceeding the safe hydraulic pressure threshold.
[0014] In an optional embodiment of this application, the host computer includes a processor and a display electrically connected to the processor. The processor is electrically connected to the pre-pump pressure sensor, the post-pump pressure sensor, and the flow meter. The processor is configured to receive monitoring parameters fed back by the pre-pump pressure sensor, the post-pump pressure sensor, and the flow meter. The display is configured to display the monitoring parameters fed back by the pre-pump pressure sensor, the post-pump pressure sensor, and the flow meter under the control of the processor. The controller is wired or wirelessly connected to the processor and is configured to control the pressure supply unit, the first motor driver, the pre-pump throttle valve, and the post-pump throttle valve according to the monitoring parameters.
[0015] Secondly, this application discloses a control method for a testing device for an electro-hydraulic power unit of new energy engineering machinery, which is applied to the testing device for an electro-hydraulic power unit of new energy engineering machinery as described in any of the first aspects. The method includes the following steps S1 to S4, wherein S1, S2, etc. are only step identifiers, and the execution order of the method is not necessarily in ascending order of numbers. For example, step S2 can be executed first and then step S1 can be executed, or they can be executed simultaneously. This application does not impose any restrictions.
[0016] S1, the controller controls the start of the pressure supply unit and the first motor driver.
[0017] S2, the controller acquires the pump inlet pressure fed back by the pump inlet pressure sensor in real time, and when the pump inlet pressure is lower than the target inlet pressure, controls the pump inlet throttle valve to reduce the flow rate in the first liquid pipe until the pump inlet pressure reaches the target inlet pressure.
[0018] S3, the controller acquires the pump post-pressure feedback from the pump post-pressure sensor in real time, and controls the pump post-throttle valve to adjust the flow rate in the second liquid pipe until the pump post-pressure is maintained at the target outlet hydraulic pressure.
[0019] S4, the controller obtains the current flow rate fed back by the flow meter in real time, and increases the power of the first motor driver to increase the speed of the hydraulic pump under test until the current flow rate remains stable for more than a preset time, and records the current speed of the hydraulic pump under test as the maximum speed.
[0020] The testing principle of this method is based on closed-loop dynamic control: First, the pressure supply unit and motor driver are started to operate the hydraulic pump under test. The inlet pressure is monitored in real time by a pressure sensor before the pump. If it is lower than the target value, the flow rate is reduced by adjusting the throttle valve before the pump until the pressure stabilizes. At the same time, the outlet pressure is monitored by a pressure sensor after the pump, and the throttle valve after the pump is adjusted to bring the outlet pressure up to the target. Then, the motor power is gradually increased to increase the pump speed. When the flow rate fed back by the flow meter remains stable for more than a preset time, the current speed is recorded as the maximum speed. Its technical advantage lies in the fact that through multi-parameter closed-loop control, it achieves active maintenance of suction pressure and accurate measurement of speed under high-speed conditions, effectively solving the test deviation problem caused by pressure fluctuations in traditional testing methods, and providing reliable experimental basis for the design optimization of high-power-density electro-hydraulic power units.
[0021] In an optional embodiment of this application, step S1 includes steps S11 to S12.
[0022] S11, the controller controls the second motor driver to output initial pressure power, so that the pressure pump starts at the initial pressure speed.
[0023] S12, the controller controls the first motor driver to output initial operating power, so that the hydraulic pump under test starts at the initial operating speed.
[0024] In an optional embodiment of this application, when the controller controls the second motor driver to output initial supply power, if the pump inlet throttle valve is completely closed, the difference between the pump inlet pressure and the target inlet pressure is greater than a preset adjustment value.
[0025] In an optional embodiment of this application, the step S2 of controlling the pre-pump throttle valve to reduce the flow rate in the first liquid pipe until the pre-pump pressure reaches the target inlet pressure includes: controlling the pre-pump throttle valve to reduce the flow rate in the first liquid pipe, so that the pre-pump pressure is greater than the target inlet pressure; when the pre-pump pressure is lower than the target inlet pressure again during the operation of the hydraulic pump under test, controlling the pre-pump throttle valve to reduce the flow rate in the first liquid pipe again, until the pre-pump pressure remains greater than or equal to the target inlet pressure for a period exceeding the preset duration.
[0026] In an optional embodiment of this application, the above method further includes: the controller controlling the host computer to display the maximum speed.
[0027] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, optional embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0029] Figure 1 This is a schematic diagram of the structure of a testing device for an electro-hydraulic power unit of new energy engineering machinery provided in this application; Figure 2 This is a flowchart illustrating the control method of a testing device for an electro-hydraulic power unit of new energy engineering machinery provided in this application. Detailed Implementation
[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.
[0031] In the field of new energy construction machinery, the electro-hydraulic power unit is a core component, and its performance directly affects the efficiency and reliability of the entire machine. However, existing testing platforms are mainly designed for conventional operating conditions. When the pump suction port is operating at high speed, local low pressure, cavitation, or eddy currents can easily cause fluctuations or even instability in the inlet pressure, making it difficult to actively maintain the target suction pressure. Especially with the trend of pursuing high power density in electro-hydraulic power units, traditional testing methods cannot accurately simulate controllable suction pressure conditions, resulting in deviations between test results and actual high-speed operating conditions. This fails to provide reliable data support for the high-speed design of high-power-density electro-hydraulic power units. This patent addresses this technical pain point by proposing a testing device and control method for electro-hydraulic power units in new energy construction machinery. By actively adjusting the suction port pressure and monitoring key parameters, it solves the problems of accuracy and reliability in high-speed testing in the new energy field.
[0032] Firstly, such as Figure 1As shown, this application provides a testing device for electro-hydraulic power units of new energy engineering machinery, used to test the maximum speed of the hydraulic pump 9 under the target inlet pressure. It includes: a controller 1, an oil tank 17, a pressure supply unit 18, a first motor driver 11, a first motor 10, a throttle valve 7 before the pump, a throttle valve 15 after the pump, a pressure sensor 8 before the pump, a pressure sensor 12 after the pump, a flow meter 14, and a host computer 13.
[0033] The controller 1 is configured to control the pressure supply unit 18 to draw oil from the oil tank 17 to the inlet of the hydraulic pump 9 under test. The controller 1 is also configured to control the first motor driver 11 to drive the first motor 10 to operate, so as to drive the hydraulic pump 9 under test to work and release the oil back into the oil tank 17 through the second liquid pipe 102.
[0034] A pre-pump pressure sensor 8 is installed at the inlet of the hydraulic pump 9 under test. The pre-pump pressure sensor 8 is configured to monitor the inlet pressure of the hydraulic pump 9 under test. A post-pump pressure sensor 12 is installed at the outlet of the hydraulic pump 9 under test. The post-pump pressure sensor 12 is configured to monitor the outlet hydraulic pressure of the hydraulic pump 9 under test.
[0035] The inlet of the hydraulic pump 9 under test is connected to the oil tank 17 via a first liquid pipe 101. A throttle valve 7 is installed on the first liquid pipe 101, which is configured to adjust the flow rate in the first liquid pipe 101 under the control of the controller 1. The outlet of the hydraulic pump 9 under test is connected to the oil tank 17 via a second liquid pipe 102. A throttle valve 15 is installed on the second liquid pipe 102, which is configured to adjust the flow rate in the second liquid pipe 102 under the control of the controller 1. A flow meter 14 is also installed on the second liquid pipe 102 to monitor the flow rate.
[0036] The host computer 13 is configured to receive and display monitoring parameters fed back by the pre-pump pressure sensor 8, the post-pump pressure sensor 12 and the flow meter 14; the controller 1 is connected to the host computer 13 by wire or wireless means.
[0037] The first aspect discloses a test device for electro-hydraulic power units of new energy engineering machinery. Its measurement method is mainly achieved through the following steps: First, the controller 1 starts the pressure supply unit 18 and the first motor driver 11 to make the hydraulic pump 9 under test run; then, the inlet pressure is monitored in real time by the pump inlet pressure sensor 8. If it is lower than the target inlet pressure, the controller 1 adjusts the pump inlet throttle valve 7 to reduce the flow rate until the target inlet pressure is reached; at the same time, the pump outlet pressure sensor 12 monitors the outlet hydraulic pressure, and the controller 1 adjusts it to the target outlet hydraulic pressure through the pump outlet throttle valve 15; finally, the controller 1 increases the power of the first motor driver 11 to increase the pump speed. When the flow rate fed back by the flow meter 14 is stable for more than a preset time, the current speed is recorded as the maximum speed, and the data is displayed by the host computer 13.
[0038] It is understandable that existing testing platforms are mainly designed for conventional operating conditions. When the pump suction port is operating at high speed, local low pressure, cavitation, or eddy currents can easily cause fluctuations or even instability in the inlet pressure, making it difficult to actively maintain the target inlet pressure. This results in deviations between the test results and actual high-speed operating conditions, failing to provide reliable data support for the high-speed design of high-power-density electro-hydraulic power units. The electro-hydraulic power unit testing device for new energy engineering machinery disclosed in this application mainly achieves active and precise control of the suction port pressure through the integration of controller 1, pressure supply unit 18, throttle valve, and multiple sensors, effectively solving the problem of test instability caused by local low pressure and cavitation under high-speed operating conditions. The device adopts closed-loop control, which can monitor and adjust the inlet / outlet pressure and flow rate in real time to ensure that the test conditions are highly consistent with the actual operating conditions. In addition, data interaction and display through the host computer 13 improves testing efficiency and data reliability. This device is specifically designed for new energy power units such as electro-hydraulic power units, providing a reliable experimental platform for the optimization of high-power-density electro-hydraulic power units and promoting the technological progress of new energy engineering machinery.
[0039] In optional embodiments of this application, such as Figure 1 As shown, the pressure supply unit 18 includes a second motor 3 driver 2, a second motor 3 and a pressure supply pump 4; the second motor 3 driver 2 drives the second motor 3 to operate under the control of the controller 1 to drive the pressure supply pump 4 to work, and draw oil from the oil tank 17 to the inlet of the hydraulic pump 9 under test.
[0040] In optional embodiments of this application, such as Figure 1 As shown, the inlet of the pressure pump 4 is connected to the oil tank 17 through the third oil pipe 103, and the third oil pipe 103 is equipped with a first filter 5; the outlet of the pressure pump 4 is connected to the inlet of the hydraulic pump 9 under test through the fourth oil pipe 104; and the second oil pipe 102 is equipped with a second filter 16.
[0041] In optional embodiments of this application, such as Figure 1 As shown, the inlet of the hydraulic pump 9 under test is connected to the oil tank 17 through the fifth liquid pipe 105. An overflow valve 6 is provided on the fifth liquid pipe 105 to prevent the hydraulic pressure at the inlet of the hydraulic pump 9 under test from exceeding the safe hydraulic pressure threshold.
[0042] It is understandable that the purpose of the relief valve 6 is to be used as a safety valve to ensure that the pressure at the inlet does not exceed the safe hydraulic threshold, which is generally 10 bar.
[0043] In an optional embodiment of this application, the host computer 13 includes a processor and a display electrically connected to the processor. The processor is electrically connected to the pre-pump pressure sensor 8, the post-pump pressure sensor 12, and the flow meter 14. The processor is configured to receive monitoring parameters fed back by the pre-pump pressure sensor 8, the post-pump pressure sensor 12, and the flow meter 14. The display is configured to display the monitoring parameters fed back by the pre-pump pressure sensor 8, the post-pump pressure sensor 12, and the flow meter 14 under the control of the processor. The controller 1 is wired or wirelessly connected to the processor. The controller 1 is configured to control the pressure supply unit 18, the first motor driver 11, the pre-pump throttle valve 7, and the post-pump throttle valve 15 according to the monitoring parameters.
[0044] In this application, the connection between the controller 1 and the processor is highly flexible, supporting both wired and wireless communication. Wired connections can utilize standard protocols such as Industrial Ethernet and RS485 to ensure real-time data transmission and interference resistance, making them suitable for testing scenarios with stringent stability requirements. Wireless connections can be achieved through Wi-Fi, Bluetooth, or a dedicated wireless module, eliminating cable constraints and improving the ease of equipment deployment. Both methods enable the controller 1 to precisely control the pressure supply unit 18, the motor driver, and the throttle valve, while ensuring the processor receives hydraulic and flow data in real time, providing reliable technical support for the testing process.
[0045] Secondly, this application discloses a control method for a testing device for an electro-hydraulic power unit of new energy engineering machinery, applicable to the testing device for an electro-hydraulic power unit of new energy engineering machinery as described in any of the first aspects. The method includes the following steps S1 to S4, as follows: Figure 2 As shown. S1, S2, etc. are just step identifiers. Except for step S1, which needs to be executed first, the execution order of other steps S2, S3, and S4 does not necessarily follow the order of numbers from smallest to largest. For example, step S4 can be executed first and then step S3, or they can be executed simultaneously. This application does not impose any restrictions.
[0046] S1, the controller starts the pressure supply unit and the first motor driver.
[0047] S2, the controller obtains the pump inlet pressure fed back by the pump inlet pressure sensor in real time. When the pump inlet pressure is lower than the target inlet pressure, the controller controls the pump inlet throttle valve 7 to reduce the flow rate in the first liquid pipe until the pump inlet pressure reaches the target inlet pressure.
[0048] S3, the controller obtains the pump post-pump pressure feedback from the pump post-pump pressure sensor in real time, controls the pump post-pump throttle valve to adjust the flow rate in the second liquid pipe until the pump post-pump pressure is maintained at the target outlet hydraulic pressure.
[0049] S4, the controller obtains the current flow rate fed back by the flow meter in real time and increases the power of the first motor driver, so that the speed of the hydraulic pump under test increases until the current flow rate remains stable for more than a preset time. Then, the current speed of the hydraulic pump under test is recorded as the maximum speed.
[0050] The testing principle of this method is based on closed-loop dynamic control: First, the pressure supply unit 18 and motor driver are started to operate the hydraulic pump 9 under test. The inlet pressure is monitored in real time by the inlet pressure sensor 8. If it is lower than the target value, the inlet throttle valve 7 is adjusted to reduce the flow rate until the pressure stabilizes. At the same time, the outlet pressure is monitored by the outlet pressure sensor 12, and the outlet throttle valve 15 is adjusted to achieve the target outlet pressure. Subsequently, the motor power is gradually increased to increase the pump speed. When the flow rate fed back by the flow meter 14 remains stable for more than a preset time, the current speed is recorded as the maximum speed. Its technical advantage lies in the fact that through multi-parameter closed-loop control, it realizes the active maintenance of oil suction pressure and accurate measurement of speed under high-speed conditions, effectively solving the test deviation problem caused by pressure fluctuations in traditional testing methods, and providing reliable experimental basis for the design optimization of high power density electro-hydraulic power units.
[0051] In an optional embodiment of this application, S1 includes the steps S11 to S12.
[0052] S11, the controller 1 controls the second motor 3 driver 2 to output initial pressure power, so that the pressure pump 4 starts at the initial pressure speed. Among them, when the controller 1 controls the second motor 3 driver 2 to output initial pressure power, if the throttle valve 7 before the pump is completely closed, the difference between the pressure before the pump and the target inlet pressure is greater than the preset adjustment value.
[0053] S12, the controller 1 controls the first motor driver 11 to output initial operating power, so that the hydraulic pump 9 under test starts at the initial operating speed.
[0054] It is understandable that in S11, controller 1 first drives the second motor 3 and driver 2 to operate at the initial pressure supply power, thereby starting the pressure supply pump 4. At this time, if the throttle valve 7 before the pump is completely closed, the difference between the pressure before the pump and the target inlet pressure will be greater than the preset adjustment value, reserving space for subsequent pressure adjustment. In S12, controller 1 then drives the first motor driver 11 to output the initial operating power, causing the hydraulic pump under test 9 to start at the initial operating speed. By starting the pressure supply unit 18 and the hydraulic pump under test 9 in stages and setting the initial parameter conditions, the foundation is laid for subsequent precise adjustment of the pressure before and after the pump and testing of the maximum speed.
[0055] In an optional embodiment of this application, controlling the pre-pump throttle valve 7 in S2 to reduce the flow rate in the first liquid pipe 101 until the pre-pump pressure reaches the target inlet pressure includes: controlling the pre-pump throttle valve 7 to reduce the flow rate in the first liquid pipe 101 so that the pre-pump pressure is greater than the target inlet pressure; when the pre-pump pressure of the hydraulic pump under test 9 is lower than the target inlet pressure again during operation, controlling the pre-pump throttle valve 7 to reduce the flow rate in the first liquid pipe 101 again until the pre-pump pressure remains greater than or equal to the target inlet pressure for a period of time exceeding a preset duration.
[0056] It is understandable that controller 1 first adjusts the throttle valve 7 before the pump to reduce the flow rate of the first liquid pipe 101, making the pressure before the pump slightly higher than the target inlet pressure, reserving pressure buffer space. After the hydraulic pump under test 9 starts running, if the pressure before the pump falls below the target value again due to the oil suction effect, controller 1 immediately adjusts the throttle valve a second time to further reduce the flow rate to compensate for the pressure loss. By cyclically executing the closed-loop control of "monitoring-adjustment-verification", the duration of the time that the pressure before the pump remains stable at or above the target value exceeds the preset threshold, ensuring that the oil suction pressure meets the design requirements during high-speed testing.
[0057] In an optional embodiment of this application, the above method further includes: controller 1 controlling host computer 13 to display the maximum speed.
[0058] The terms "first," "second," "first," or "second" as used in the various embodiments of this disclosure may modify various components regardless of their order and / or importance, but these terms do not limit the corresponding components. The above terms are configured only for the purpose of distinguishing an element from other elements. For example, "first user equipment" and "second user equipment" refer to different user equipments, although both are user equipment. For example, without departing from the scope of this disclosure, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.
[0059] When a component (e.g., a first component) is referred to as being "(operably or communicatively) coupled" or "(operably or communicatively) coupled to" or "connected to" another component (e.g., a second component), it should be understood that the first component is directly connected to the second component or that the first component is indirectly connected to the second component via yet another component (e.g., a third component). Conversely, it can be understood that when a component (e.g., a first component) is referred to as being "directly connected" or "directly coupled" to another component (the second component), no component (e.g., a third component) is inserted between the two.
[0060] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, components, features, and elements with the same names in different embodiments of this application may have the same meaning or different meanings, the specific meaning of which must be determined by its interpretation in that specific embodiment or further in conjunction with the context of that specific embodiment.
[0061] The above description is merely an optional embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in this application.
[0062] Depending on the context, the words “if” or “suppose” as used here can be interpreted as “when” or “in response to determination” or “in response to detection.” Similarly, depending on the context, the phrases “if determination” or “if detection (of the stated condition or event)” can be interpreted as “when determination” or “in response to determination” or “when detection (of the stated condition or event)” or “in response to detection (of the stated condition or event).”
[0063] The above description is merely an optional embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in this application.
[0064] The above description is merely an optional embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A testing device for electro-hydraulic power units of new energy engineering machinery, used to test the maximum speed of the hydraulic pump under test at a target inlet pressure, characterized in that, include: Controller, oil tank, pressure supply unit, first motor driver, first motor, pre-pump throttle valve, post-pump throttle valve, pre-pump pressure sensor, post-pump pressure sensor, flow meter, host computer; The controller is configured to control the pressure supply unit to draw oil from the oil tank to the inlet of the hydraulic pump under test. The controller is also configured to control the first motor driver to drive the first motor to operate, thereby driving the hydraulic pump under test to work and release the oil back to the oil tank through the second liquid pipe. The hydraulic pump under test is provided with a pump inlet pressure sensor, which is configured to monitor the pump inlet pressure; the hydraulic pump under test is provided with a pump outlet pressure sensor, which is configured to monitor the pump outlet pressure. The inlet of the hydraulic pump under test is connected to the oil tank via a first liquid pipe. A throttle valve is installed on the first liquid pipe, which is configured to adjust the flow rate in the first liquid pipe under the control of the controller. The outlet of the hydraulic pump under test is connected to the oil tank via a second liquid pipe. A throttle valve is installed on the second liquid pipe, which is configured to adjust the flow rate in the second liquid pipe under the control of the controller. A flow meter is also installed on the second liquid pipe to monitor the flow rate. The host computer is configured to receive and display monitoring parameters fed back by the pre-pump pressure sensor, the post-pump pressure sensor, and the flow meter; the controller is connected to the host computer via wired or wireless means.
2. The testing device for the electro-hydraulic power unit of new energy engineering machinery according to claim 1, characterized in that, The pressure supply unit includes a second motor driver, a second motor, and a pressure supply pump; the second motor driver drives the second motor to operate under the control of the controller to drive the pressure supply pump to work and draw oil from the oil tank to the inlet of the hydraulic pump under test.
3. The testing device for the electro-hydraulic power unit of new energy engineering machinery according to claim 2, characterized in that, The inlet of the pressure pump is connected to the oil tank through a third oil pipe, and a first filter is installed on the third oil pipe; the outlet of the pressure pump is connected to the inlet of the hydraulic pump under test through a fourth oil pipe. A second filter is installed on the second liquid pipe.
4. The testing device for electro-hydraulic power units of new energy engineering machinery according to claim 1, characterized in that, The inlet of the hydraulic pump under test is connected to the oil tank via a fifth liquid pipe. An overflow valve is installed on the fifth liquid pipe to prevent the hydraulic pressure at the inlet of the hydraulic pump under test from exceeding the safe hydraulic pressure threshold.
5. The testing device for electro-hydraulic power units of new energy engineering machinery according to any one of claims 1 to 4, characterized in that, The host computer includes a processor and a display electrically connected to the processor. The processor is electrically connected to the pre-pump pressure sensor, the post-pump pressure sensor, and the flow meter. The processor is configured to receive monitoring parameters fed back by the pre-pump pressure sensor, the post-pump pressure sensor, and the flow meter. The display is configured to display the monitoring parameters fed back by the pre-pump pressure sensor, the post-pump pressure sensor, and the flow meter under the control of the processor. The controller is connected to the processor via a wired or wireless connection, and the controller is configured to control the pressure supply unit, the first motor driver, the pre-pump throttle valve, and the post-pump throttle valve according to the monitoring parameters.
6. A control method for a testing device for an electro-hydraulic power unit of new energy engineering machinery, applied to the testing device for an electro-hydraulic power unit of new energy engineering machinery as described in any one of claims 1 to 5, characterized in that, The method includes the following steps: S1, the controller controls the pressure supply unit and the first motor driver to start; S2, the controller acquires the pump inlet pressure fed back by the pump inlet pressure sensor in real time, and when the pump inlet pressure is lower than the target inlet pressure, controls the pump inlet throttle valve to reduce the flow rate in the first liquid pipe until the pump inlet pressure reaches the target inlet pressure; S3, the controller acquires the pump pressure fed back by the pump pressure sensor in real time, and controls the pump throttle valve to adjust the flow rate in the second liquid pipe until the pump pressure is maintained at the target outlet hydraulic pressure; S4, the controller obtains the current flow rate fed back by the flow meter in real time, and increases the power of the first motor driver to increase the speed of the hydraulic pump under test until the current flow rate remains stable for more than a preset time, and records the current speed of the hydraulic pump under test as the maximum speed.
7. The control method of the electro-hydraulic power unit testing device for new energy engineering machinery according to claim 6, characterized in that, S1 includes the following steps: S11, the controller controls the second motor driver to output initial pressure power, so that the pressure pump starts at the initial pressure speed; S12, the controller controls the first motor driver to output initial operating power, so that the hydraulic pump under test starts at the initial operating speed.
8. The control method for the electro-hydraulic power unit testing device for new energy engineering machinery according to claim 7, characterized in that, When the controller controls the second motor driver to output initial supply power, if the throttle valve before the pump is completely closed, the difference between the pressure before the pump and the target inlet pressure is greater than the preset adjustment value.
9. The control method for the electro-hydraulic power unit testing device for new energy engineering machinery according to claim 6, characterized in that, The step S2, controlling the pre-pump throttle valve to reduce the flow rate in the first liquid line until the pre-pump pressure reaches the target inlet pressure, includes: The flow rate in the first liquid pipe is reduced by controlling the throttle valve before the pump, so that the pressure before the pump is greater than the target inlet pressure. When the pressure before the pump is lower than the target inlet pressure again during the operation of the hydraulic pump under test, the flow rate in the first liquid pipe is reduced again by controlling the throttle valve before the pump, until the time during which the pressure before the pump is maintained at or above the target inlet pressure exceeds the preset time.
10. The control method of the electro-hydraulic power unit testing device for new energy engineering machinery according to claim 6, characterized in that, The method further includes: the controller controlling the host computer to display the maximum speed.