Method and system for controlling start-stop endurance test of high-pressure water pump

Abstract

The invention discloses a high-pressure water pump start-stop endurance test control method and system, and relates to the technical field of high-pressure water pump tests.The high-pressure water pump, a water tank and a cooling pipeline form a water circulation system, and the water circulation system further comprises a three-way valve, an adjusting valve, a heater and a high-temperature fan. The liquid level and pressure parameters of the water tank are monitored, when the liquid level is lower than the safe liquid level, the pressure parameters of the water tank are released to the safe pressure parameters, and water is supplemented to the water tank; the actual rotating speed of the high-pressure water pump is monitored, and failure protection is triggered when the difference value between the actual rotating speed and the target rotating speed exceeds a preset threshold value; and when the operation frequency of the high-pressure water pump reaches the preset cycle frequency, water of the cooling pipeline is drained to the drainage channel. Water is supplemented when the liquid level of the water tank is insufficient, protection is triggered when the rotating speed of the high-pressure water pump is abnormal, and the problem that a water circulation system operates unstably in the high-pressure water pump start-stop durability test is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of high-pressure water pump testing, and in particular to a control method and system for a start-stop durability test of a high-pressure water pump. Background Art

[0002] In the field of high-pressure water pump start-stop durability testing, the stability control of the water circulation system in the existing technology faces many challenges. The current test benches generally have the problem of imperfect control strategies. They only monitor the starting speed and final speed of the water pump and cannot cope with the abnormal situation of speed jump during the test, resulting in frequent test failures and waste of resources. At the same time, there is a lack of a real-time water replenishment mechanism during the test. When the water temperature is maintained at a high temperature of 90°C, multiple starts and stops of the water pump will cause exhaust due to the sudden increase in water pressure, resulting in a decrease in coolant as the gaseous water is discharged. The existing technology requires manual water replenishment after shutdown, which seriously affects the reliability of the test. In addition, the drainage operation after the test is completed relies on manual disassembly of the pipeline, which not only causes coolant to spill onto the bench and the ground, but also poses a risk of leakage of high-voltage wiring harnesses, further exacerbating the instability of the water circulation system. The above defects make it difficult for the existing technology to meet the requirements of high-pressure water pump durability testing for system stability and safety.

[0003] It can be seen that the existing technology still needs to be improved and enhanced. Summary of the Invention

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a control method and system for a high-pressure water pump start-stop endurance test to solve the problem of unstable operation of the water circulation system in the high-pressure water pump start-stop endurance test.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: The first aspect of the present invention provides a control method for the start-stop durability test of a high-pressure water pump. The high-pressure water pump, water tank, and cooling pipeline are connected through pipelines to form a water circulation system. The water circulation system further includes a three-way valve, a regulating valve, a heater, and a high-temperature fan. The three-way valve has a small-circulation inlet, a large-circulation inlet, and an outlet. The outlet of the three-way valve is connected to the cooling pipeline through a pipeline. The small-circulation inlet and the large-circulation inlet of the three-way valve are respectively connected to the regulating valve through two pipelines. The heater is arranged on the pipeline connecting the small-circulation inlet and the regulating valve, and the high-temperature fan is arranged on the pipeline connecting the large-circulation inlet and the regulating valve. The control method for the start-stop durability test of the high-pressure water pump includes: when entering the automatic circulation condition, monitoring the liquid level and pressure parameters of the water tank. When the liquid level is lower than the safe liquid level, discharging the pressure parameter of the water tank to the safe pressure parameter and replenishing water to the water tank; monitoring the actual rotation speed of the high-pressure water pump, and triggering fail-safe protection when the difference between the actual rotation speed and the target rotation speed exceeds a preset threshold; when the start-stop operation times of the high-pressure water pump reach the preset number of cycles, discharging the water in the cooling pipeline to the drainage channel.

[0006] Optionally, in the first implementation manner of the first aspect of the present invention, a temperature sensor is arranged between the heater and the cooling pipeline. Before the step of entering the automatic circulation condition, it further includes: setting the preset number of cycles of the start-stop of the high-pressure water pump and the preset water temperature of the cooling pipeline; starting the high-pressure water pump and adjusting it to run at the target rotation speed, starting the heater, and only conducting the small-circulation inlet of the three-way valve to make the water in the cooling pipeline flow along the small-circulation path; when the water temperature of the cooling pipeline detected by the temperature sensor reaches the preset water temperature, simultaneously conducting the small-circulation inlet and the large-circulation inlet of the three-way valve to make the water in the cooling pipeline flow along the small-circulation path and the large-circulation path, and enter the automatic circulation condition.

[0007] Optionally, in the second implementation manner of the first aspect of the present invention, the step of setting the preset number of cycles of the start-stop of the high-pressure water pump and the preset water temperature of the cooling pipeline includes: setting the preset number of cycles of the start-stop of the high-pressure water pump to 1000 times, and setting the preset water temperature of the cooling pipeline to 90 °C.

[0008] Optionally, in the third implementation manner of the first aspect of the present invention, the step of starting the high-pressure water pump and adjusting it to run at the target rotation speed includes: starting the high-pressure water pump; controlling the rotation speed of the high-pressure water pump to accelerate from 0 rpm to the target rotation speed and stably running at the target rotation speed for a first preset time; when the high-pressure water pump stably runs to the first preset time, controlling the high-pressure water pump to decelerate from the target rotation speed to 0 rpm to complete a single rotation speed cycle.

[0009] Optionally, in the fourth implementation manner of the first aspect of the present invention, a liquid level sensor is provided at the bottom of the water tank, and the liquid level and pressure parameters of the water tank are monitored. When the liquid level is lower than the safe liquid level, the pressure parameter of the water tank is released to the safe pressure parameter, and the step of replenishing water to the water tank includes: monitoring the liquid level of the water tank through the liquid level sensor; when the liquid level sensor detects that the liquid level in the water tank is lower than the safe liquid level and lasts for a second preset time, an alarm is issued, and water is replenished to the water tank; when the liquid level sensor detects that the liquid level in the water tank is higher than the safe liquid level and lasts for a third preset time, the alarm is cancelled, and the water replenishment to the water tank is stopped.

[0010] Optionally, in the fifth implementation manner of the first aspect of the present invention, a pressure relief valve and a water replenishment valve are provided at the top of the water tank. The step of replenishing water to the water tank includes: opening the pressure relief valve to release the pressure parameter of the water tank to the safe pressure parameter; opening the water replenishment valve, and controlling the water replenishment valve to inject water into the water tank at a preset flow rate until the liquid level sensor detects that the liquid level in the water tank is higher than the safe liquid level and lasts for a third preset time.

[0011] Optionally, in the sixth implementation manner of the first aspect of the present invention, the step of stopping the water replenishment to the water tank includes: closing the pressure relief valve and the water replenishment valve to stop the water replenishment to the water tank.

[0012] Optionally, in the seventh implementation manner of the first aspect of the present invention, the high-pressure water pump is connected with a rotational speed sensor, and the actual rotational speed of the high-pressure water pump is monitored. When the difference between the actual rotational speed and the target rotational speed exceeds a preset threshold, the step of triggering the fail-safe protection includes: monitoring the actual rotational speed of the high-pressure water pump through the rotational speed sensor; comparing the target rotational speed with the actual rotational speed. When the difference between the target rotational speed and the actual rotational speed exceeds a preset difference, and the high-pressure water pump operates at the actual rotational speed for more than a fourth preset time, an abnormal rotational speed state is fed back; if the abnormal rotational speed state lasts for a fifth preset time, control the heater to stop heating, start the high-temperature fan, reduce the water temperature of the cooling pipeline from the preset water temperature to the first water temperature, and then control the high-temperature fan and the high-pressure water pump to stop operating.

[0013] Optionally, in the eighth implementation manner of the first aspect of the present invention, the regulating valve has a drain port for connecting to a drain channel, a flow meter is provided between the cooling pipeline and the high-pressure water pump, and the step of discharging the water in the cooling pipeline to the drain channel when the start-stop operation times of the high-pressure water pump reach a preset cycle number includes: when the start-stop operation times of the high-pressure water pump complete the preset cycle number or the high-pressure water pump receives a drain instruction, controlling the regulating valve to open the drain port so that the water in the cooling pipeline flows through the high-pressure water pump and the regulating valve into the drain channel; when the flow meter detects that the outlet flow rate of the cooling pipeline is 0 L / min and lasts for a sixth preset time, closing the regulating valve to complete the drainage operation.

[0014] The second aspect of the present invention provides a control system for the start-stop durability test of a high-pressure water pump. The control system for the start-stop durability test of the high-pressure water pump includes: a high-pressure water pump, a water tank, and a cooling pipeline. The inlet of the cooling pipeline is connected to the outlet of the high-pressure water pump, and the outlet of the cooling pipeline is respectively connected to the interface of the water tank and the inlet of the high-pressure water pump. A pressure relief and water replenishment valve is provided at the top of the water tank; a three-way valve, a regulating valve, a heater, and a high-temperature fan. The three-way valve has a small circulation inlet, a large circulation inlet, and an outlet. The outlet of the three-way valve is connected to the cooling pipeline through a pipeline. The small circulation inlet and the large circulation inlet of the three-way valve are respectively connected to the regulating valve through two pipelines. The heater is provided on the pipeline connecting the small circulation inlet and the regulating valve, and the high-temperature fan is provided on the pipeline connecting the large circulation inlet and the regulating valve. The regulating valve has a drain port for connecting to a drain channel; a temperature sensor, a liquid level sensor, a rotation speed sensor, and a flow meter; the temperature sensor is provided between the heater and the cooling pipeline, the liquid level sensor is provided at the bottom of the water tank, the rotation speed sensor is connected to the high-pressure water pump, and the flow meter is provided between the cooling pipeline and the high-pressure water pump; a controller, which is electrically connected to the high-pressure water pump, the three-way valve, the regulating valve, the heater, the high-temperature fan, the temperature sensor, the liquid level sensor, the rotation speed sensor, and the flow meter respectively, and is used to control the high-pressure water pump, the three-way valve, the regulating valve, the heater, the high-temperature fan, the temperature sensor, the liquid level sensor, the rotation speed sensor, and the flow meter to implement the steps of the control method for the start-stop durability test of the high-pressure water pump as described in any one of the above manners.

[0015] Beneficial effects: In the technical solution of the present invention, a water circulation system connecting a high-pressure water pump, a water tank and a cooling pipeline is constructed. When entering the automatic circulation working condition, the liquid level and pressure of the water tank are monitored in real time. When the liquid level is lower than the safe liquid level, the pressure of the water tank is first released to the safe value and then automatically replenished with water to maintain the stability of the system water volume. The actual rotation speed of the water pump is continuously monitored. When the difference from the target rotation speed exceeds the preset threshold, a failure protection mechanism is triggered to avoid damage to the equipment caused by abnormal operation. After the water pump completes the preset start-stop cycle times, the water in the cooling pipeline is discharged to the drainage channel to achieve rapid drainage after the test. Through the coordinated control of automatic liquid level water replenishment, abnormal rotation speed protection and intelligent drainage, the present invention effectively solves the problems of the need to stop the machine for water replenishment, no protection for abnormal rotation speed and unsafe manual drainage in traditional tests, improves the reliability and safety of the start-stop durability test of the high-pressure water pump, reduces manual intervention, reduces the test cost, and ensures the continuous controllability of the test process. Description of the Drawings

[0016] Figure 1 The first flow chart of the control method for the start-stop durability test of the high-pressure water pump provided by the present invention; Figure 2 The second flow chart of the control method for the start-stop durability test of the high-pressure water pump provided by the present invention; Figure 3 The third flow chart of the control method for the start-stop durability test of the high-pressure water pump provided by the present invention; Figure 4 The fourth flow chart of the control method for the start-stop durability test of the high-pressure water pump provided by the present invention; Figure 5 The fifth flow chart of the control method for the start-stop durability test of the high-pressure water pump provided by the present invention; Figure 6 The sixth flow chart of the control method for the start-stop durability test of the high-pressure water pump provided by the present invention; Figure 7 The seventh flow chart of the control method for the start-stop durability test of the high-pressure water pump provided by the present invention; Figure 8 The eighth flow chart of the control method for the start-stop durability test of the high-pressure water pump provided by the present invention; Figure 9 The ninth flow chart of the control method for the start-stop durability test of the high-pressure water pump provided by the present invention; Figure 10 The structural schematic diagram of the control system for the start-stop durability test of the high-pressure water pump provided by the present invention.

[0017] Explanation of the reference numerals in the drawings: 10. Cooling pipeline; 20. Water tank; 21. Interface of the water tank; 22. Make-up water valve; 23. Pressure relief valve; 30. Flowmeter; 40. Liquid level sensor; 50. High-pressure water pump; 51. Inlet of the high-pressure water pump; 52. Outlet of the high-pressure water pump; 60. Control valve; 61. Drain port; 70. Heater; 80. High-temperature fan; 90. Three-way valve; 91. Inlet of the large circulation; 92. Inlet of the small circulation; 93. Outlet of the three-way valve. Detailed implementation manners

[0018] The present invention provides a control method for the start-stop durability test of a high-pressure water pump. By constructing a water circulation system in which the high-pressure water pump, the water tank and the cooling pipeline are connected: when entering the automatic circulation condition, the liquid level and pressure of the water tank are monitored in real time. When the liquid level is lower than the safe liquid level, the pressure of the water tank is first released to the safe value and then automatically replenished with water to maintain the stability of the system water volume; continuously monitor the actual rotation speed of the water pump. When the difference from the target rotation speed exceeds the preset threshold, the failure protection mechanism is triggered to avoid damage to the equipment caused by abnormal operation; after the water pump completes the preset number of start-stop cycles, the water in the cooling pipeline is drained into the drainage channel to achieve rapid drainage after the test. The present invention improves the reliability and safety of the start-stop durability test of the high-pressure water pump, reduces manual intervention, reduces the test cost, ensures the continuity and controllability of the test process, and solves the problem of unstable operation of the water circulation system in the start-stop durability test of the high-pressure water pump.

[0019] The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" or "having" and any variation thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0020] For ease of understanding, the specific process of the embodiment of the present invention will be described below. Please refer to Figure 1 In the first embodiment of the control method for the start-stop durability test of the high-pressure water pump in the embodiment of the present invention, it includes: S100. When entering the automatic circulation condition, monitor the liquid level and pressure parameters of the water tank. When the liquid level is lower than the safe liquid level, release the pressure parameter of the water tank to the safe pressure parameter and replenish water to the water tank. In this embodiment, the control method for the start-stop durability test of the high-pressure water pump is applied to a water circulation system composed of a high-pressure water pump, a water tank, a cooling pipeline, a three-way valve, a regulating valve, a heater, and a high-temperature fan. Among them, the outlet of the three-way valve is connected to the cooling pipeline, and its small-circulation inlet and large-circulation inlet are respectively connected to the regulating valve through pipelines. The heater and the high-temperature fan are respectively arranged on the corresponding pipelines to form independent small-circulation and large-circulation paths. The specific control steps and data are as follows: The system monitors the liquid level change in real time through the liquid level sensor at the bottom of the water tank. When the liquid level is lower than the preset safety liquid level, first open the pressure relief valve at the top of the water tank to release the pressure, and then supplement deionized water into the water tank through the water replenishing valve at the top of the water tank until the liquid level returns above the safety liquid level and stabilizes.

[0021] It should be understood that "entering the automatic circulation mode" means that after the high-pressure water pump start-stop durability test system completes the preliminary preparation, it enters the stage of fully automatic circulation operation. For example, when the system heats the water temperature in the cooling pipeline to the preset value through the small-circulation path, the small-circulation and large-circulation inlets of the three-way valve are simultaneously opened, so that the cooling water circulates in a dual-path manner. At this time, the water pump automatically completes the rotation speed cycle according to the preset rules, and the system synchronously activates full-automatic control functions such as liquid level monitoring and abnormal rotation speed protection, and can continuously perform the durability test without manual intervention until the preset number of cycles is reached or the shutdown condition is triggered.

[0022] As an example, in this embodiment, the safety liquid level of the water tank is set to 15 cm. After the liquid level sensor continuously monitors for 10 seconds, if it detects that the liquid level of the water tank is lower than 15 cm, an alarm is immediately issued. At this time, the pressure relief valve is opened to release the pressure in the water tank to 1 bara, and then the water replenishing valve is opened to replenish water into the water tank at a flow rate of 5 liters per minute. When the liquid level sensor detects that the liquid level of the water tank is higher than 15 cm and lasts for 10 seconds, the pressure relief valve and the water replenishing valve are closed to restore the sealed state of the system, and the start-stop durability test of the high-pressure water pump continues to run.

[0023] S200. Monitor the actual rotation speed of the high-pressure water pump, and trigger the failure protection when the difference between the actual rotation speed and the target rotation speed exceeds the preset threshold; In this embodiment, the rotation speed data is collected in real time through the rotation speed sensor installed on the high-pressure water pump, and the actual rotation speed is compared with the target rotation speed. When the rotation speed deviation exceeds the preset threshold and lasts for a certain period of time, first stop the heater from working, start the high-temperature fan to cool down until the water temperature drops to the safe value, and then shut down and cut off the power supply.

[0024] As an example, in this embodiment, the target rotational speed is set to 6000 revolutions per minute, and the preset threshold is 300 revolutions per minute. When the rotational speed sensor detects that the difference between the actual rotational speed and 6000 revolutions per minute exceeds 300 revolutions per minute, and the water pump operates at this abnormal rotational speed for more than 40 seconds, the system feedbacks the abnormal rotational speed state; if the abnormal state persists for 5 seconds, the heater heating is immediately terminated, the high-temperature fan is started, the water temperature in the cooling pipeline is reduced from the preset 90 °C to 50 ± 2 °C, then the high-temperature fan and the water pump are controlled to stop running, and the high and low voltage power supplies are disconnected for troubleshooting.

[0025] S300. When the start-stop operation times of the high-pressure water pump reach the preset cycle times, the water in the cooling pipeline is discharged into the drainage channel.

[0026] In this embodiment, when the high-pressure water pump completes the preset start-stop cycle times or receives a drainage instruction, the control valve is controlled to switch to the drainage flow channel, so that the water in the cooling pipeline is discharged into the drainage channel through the water pump and the control valve, and the outlet flow is monitored by a flow meter. When the flow is 0, it is determined that the drainage is completed.

[0027] As an example, the preset cycle times in this embodiment are set to 1000 times. After the water pump completes 1000 start-stop cycles of 0 - 6000 revolutions per minute, the system controls the control valve to conduct the drainage port, and the water in the cooling pipeline flows through the water pump and the control valve into the drainage flow channel in sequence. The flow meter installed on the cooling pipeline at the outlet of the water pump continuously monitors the flow. When the detected outlet flow is 0 liters per minute and lasts for 10 seconds, the control valve is closed to complete the drainage operation, ensuring that there is no liquid water residue in the cooling pipeline.

[0028] The control method for the start-stop durability test of the high-pressure water pump provided in this embodiment effectively solves the problems of stopping the machine for water replenishment, no protection for abnormal rotational speed, and unsafe manual drainage in traditional tests through the coordinated control of automatic liquid level water replenishment, rotational speed abnormal protection, and intelligent drainage, improves the reliability and safety of the start-stop durability test of the high-pressure water pump, reduces manual intervention, reduces the test cost, and ensures the continuity and controllability of the test process.

[0029] Please refer to Figure 2 , the second embodiment of the control method for the start-stop durability test of the high-pressure water pump in the embodiment of the present invention includes: A temperature sensor is provided between the heater and the cooling pipeline. Before the step of entering the automatic circulation working condition, it further includes: S400. Set the preset cycle times of the start-stop of the high-pressure water pump and the preset water temperature of the cooling pipeline; S500. Start the high-pressure water pump and adjust it to operate at the target rotational speed, start the heater, and only conduct the small circulation inlet of the three-way valve, so that the water in the cooling pipeline flows along the small circulation path; When the water temperature of the cooling pipeline is detected by the temperature sensor and reaches the preset water temperature, the small circulation inlet and the large circulation inlet of the three-way valve are simultaneously opened, so that the water in the cooling pipeline flows along the small circulation path and the large circulation path, entering the automatic circulation mode.

[0030] In this embodiment, before entering the automatic circulation mode, the system sets the preset number of start-stop cycles of the high-pressure water pump to 1000 times through the human-machine interface, and the preset water temperature of the cooling pipeline is 90 °C. Start the high-pressure water pump and control its speed to linearly accelerate from 0 rpm to 6000 rpm. At the same time, start the heater installed on the pipeline between the small circulation inlet and the regulating valve, and only open the small circulation inlet of the three-way valve, so that the cooling water in the cooling pipeline flows along the path of "high-pressure water pump - regulating valve - heater - small circulation inlet of three-way valve - cooling pipeline - high-pressure water pump inlet / tank interface". When the temperature sensor installed between the heater and the cooling pipeline detects that the water temperature reaches 90 °C, the large circulation inlet of the three-way valve is synchronously opened, so that the cooling water in the cooling pipeline flows along the path of "high-pressure water pump - regulating valve - high-temperature fan - large circulation inlet of three-way valve - cooling pipeline - high-pressure water pump inlet / tank interface". At this time, the three-way valve is in a state of simultaneously opening the small circulation and the large circulation inlets, so that the cooling water in the cooling pipeline flows along the path of "high-pressure water pump - regulating valve - heater / high-temperature fan - small circulation inlet / large circulation inlet of three-way valve - cooling pipeline - high-pressure water pump inlet / tank interface", entering the automatic circulation mode, and the high-pressure water pump runs alternately at 0 rpm and at 6000 rpm.

[0031] Please refer to Figure 3 , the third embodiment of the control method for the start-stop durability test of the high-pressure water pump in the embodiment of the present invention includes: The step of setting the preset number of start-stop cycles of the high-pressure water pump and the preset water temperature of the cooling pipeline includes: S410. Set the preset number of start-stop cycles of the high-pressure water pump to 1000 times, and set the preset water temperature of the cooling pipeline to 90 °C.

[0032] In this embodiment, the preset number of start-stop cycles of the high-pressure water pump is set to 1000 times, and this value is set based on the durability test standard of the high-pressure water pump industry, which can cover the life assessment requirements under most working conditions; the preset water temperature is set to 90 °C. Since the ideal working temperature of the fuel cell stack is usually 60 - 80 °C, in order to better verify whether the high-pressure water pump can work normally at a high temperature of 90 °C, the preset water temperature in this embodiment is set to 90 °C to simulate the high-temperature load scenario in actual operation and ensure that the test conditions are consistent with the real working conditions.

[0033] Please refer to Figure 4 , the fourth embodiment of the control method for the start-stop durability test of the high-pressure water pump in the embodiment of the present invention includes: The step of starting the high-pressure water pump and adjusting it to run at a target speed includes: S510, starting the high-pressure water pump; S520, controlling the speed of the high-pressure water pump to accelerate from 0 rpm to a target speed, and stably operating at the target speed for a first preset time; S530: When the high-pressure water pump runs stably for a first preset time, control the high-pressure water pump to decelerate from the target speed to 0 rpm to complete a single speed cycle.

[0034] In this embodiment, the first preset time is set to 32 seconds. After the high-pressure water pump is started, the system uses the PID control algorithm to increase the speed of the high-pressure water pump from 0rpm to 6000rpm, which takes 4 seconds; it runs stably at 6000rpm for 32 seconds; when the high-pressure water pump runs stably for 32 seconds, the speed of the high-pressure water pump is controlled to decrease from 6000rpm to 0rpm, which takes 3 seconds; it continues at 0rpm for 32 seconds to complete a single speed cycle. The entire single cycle takes 71 seconds.

[0035] Reference Figure 5 The fifth embodiment of the control method for the start-stop durability test of the high-pressure water pump in the embodiment of the present invention includes: The bottom of the water tank is provided with a liquid level sensor, which monitors the liquid level and pressure parameters of the water tank. When the liquid level is lower than the safe liquid level, the pressure parameter of the water tank is released to the safe pressure parameter, and the water tank is replenished with water, including: S110, monitoring the liquid level of the water tank by the liquid level sensor; S120, when the liquid level sensor detects that the liquid level in the water tank is lower than the safe liquid level and lasts for a second preset time, an alarm is issued and water is replenished in the water tank; S130. When the liquid level sensor detects that the liquid level in the water tank is higher than the safe liquid level and lasts for a third preset time, the alarm is released and water replenishment to the water tank is stopped.

[0036] In this embodiment, the second preset time is set to 10 seconds, the third preset time is set to 10 seconds, and the safety liquid level is set to 15 cm. A liquid level sensor is installed at the bottom of the water tank, and its safety liquid level is preset to 15 cm. The system monitors the liquid level in the water tank in real time through the liquid level sensor. The specific implementation process is as follows: when the liquid level sensor detects that the liquid level in the water tank is lower than 15 cm for 10 seconds, an audible and visual alarm is immediately issued through the human-machine interface, such as a buzzer alarm and a red indicator light, and the water replenishment program is triggered to replenish the water tank; when the liquid level sensor detects that the liquid level in the water tank is higher than 15 cm and lasts for 10 seconds, the alarm is lifted and water replenishment of the water tank is stopped. For example, in a certain experiment, the liquid level dropped by 2 cm from 15 cm and lasted for 10 seconds, and the system alarm sounded. After the water was replenished to 15 cm and stabilized for 10 seconds, the alarm disappeared.

[0037] Reference Figure 6 The sixth embodiment of the control method for the start-stop durability test of a high-pressure water pump according to the present invention includes: A pressure relief valve and a water supply valve are provided on the top of the water tank. The step of supplying water to the water tank includes: S121, opening the pressure relief valve to release the pressure parameter of the water tank to a safe pressure parameter; S122, open the water supply valve, and control the water supply valve to fill water into the water tank at a preset flow rate until the liquid level sensor detects that the liquid level in the water tank is higher than the safe liquid level and lasts for a third preset time.

[0038] In this embodiment, the safety pressure parameter is set to 1 bara, and the preset flow rate is set to 5 liters / minute. When the liquid level sensor detects that the liquid level in the water tank is below the safety level, triggering an alarm, the following water replenishment steps are performed: With the safety level set at 15 cm, the pressure relief valve is first opened to release the pressure in the water tank to 1 bara. This process continues for approximately 30 seconds until the pressure gauge displays a stable reading. The water replenishment valve is then opened and controlled to inject water into the water tank at a preset flow rate of 5 liters / minute until the liquid level sensor detects that the liquid level in the water tank is above 15 cm for 10 seconds. Water replenishment is then stopped. For example, during the water replenishment process, after the pressure relief valve is opened, the pressure drops from 1.5 bara to 1 bara. The water replenishment valve then replenishes water at a flow rate of 5 L / min, injecting approximately 5 liters of water per minute into the water tank, causing the liquid level to rise from 13 cm to 16 cm. The liquid level of 16 cm is maintained for 10 seconds, after which the water replenishment valve is closed to cease water replenishment.

[0039] Reference Figure 7 The seventh embodiment of the control method for the start-stop durability test of a high-pressure water pump according to the present invention includes: The step of stopping replenishing water to the water tank comprises: S131, closing the pressure relief valve and the water supply valve to stop supplying water to the water tank.

[0040] In this embodiment, when the liquid level sensor detects that the liquid level is higher than 15 cm and lasts for 10 seconds, the system performs the operation of stopping water replenishment: first, close the pressure relief valve at the top of the water tank, and then close the water replenishment valve at the top of the water tank to ensure that the cooling pipeline returns to a sealed state. After closing the water replenishment valve and the pressure relief valve, the system automatically detects the pressure fluctuation of the cooling pipeline. If the pressure is stable within the range of 1 bara ± 0.1 bara within 1 minute, it is determined that the seal is normal and the test continues to run. For example, after the water replenishment is completed, the pressure relief valve and the water replenishment valve are closed in sequence, and the pressure of the cooling pipeline gradually rises from 1 bara to 1.1 bara and remains stable, confirming no leakage.

[0041] Refer to Figure 8 , the eighth embodiment of the control method for the start-stop durability test of the high-pressure water pump in the embodiment of the present invention includes: The high-pressure water pump is connected with a rotational speed sensor, and the step of monitoring the actual rotational speed of the high-pressure water pump and triggering the fail-safe protection when the difference between the actual rotational speed and the target rotational speed exceeds a preset threshold includes: S210. Monitor the actual rotational speed of the high-pressure water pump through the rotational speed sensor; S220. Compare the target rotational speed with the actual rotational speed. When the difference between the target rotational speed and the actual rotational speed exceeds the preset difference, and the high-pressure water pump operates at the actual rotational speed for more than the fourth preset time, feedback the abnormal rotational speed state; S230. If the abnormal rotational speed state lasts for the fifth preset time, control the heater to stop heating, start the high-temperature fan, and after reducing the water temperature of the cooling pipeline from the preset water temperature to the first water temperature, control the high-temperature fan and the high-pressure water pump to stop running.

[0042] In this embodiment, the high-pressure water pump is connected with a rotational speed sensor for real-time monitoring of the rotational speed of the high-pressure water pump. In this embodiment, the target rotational speed is set to 6000 rpm, the preset difference is set to 300 rpm, the fourth preset time is set to 40 seconds, the fifth preset time is set to 5 seconds, and the first water temperature is set to 50 ± 2 °C. In practical applications, when the difference between the actual rotational speed and the target rotational speed of 6000 rpm exceeds 300 rpm, and the water pump operates at this abnormal rotational speed for more than 40 seconds, the system feedbacks the abnormal rotational speed state; if the abnormal state lasts for 5 seconds, the heater heating is immediately stopped, the high-temperature fan is started to reduce the water temperature of the cooling pipeline from 90 °C to 50 ± 2 °C, and then the fan and the water pump are controlled to stop and the power supply is disconnected. For example, when the actual rotational speed of the water pump is 5600 rpm, the difference from the target rotational speed of 6000 rpm is 400 rpm, and it still does not recover after running for 130 seconds, the protection is triggered, and it stops after cooling down to 50 °C.

[0043] Refer to Figure 9, the ninth embodiment of the control method for the start-stop durability test of the high-pressure water pump in the embodiment of the present invention includes: The regulating valve has a drain port for connecting to the drain channel. A flow meter is provided between the cooling pipeline and the high-pressure water pump. The step of draining the water in the cooling pipeline to the drain channel when the start-stop operation times of the high-pressure water pump reach a preset number of cycles includes: S310. When the start-stop operation times of the high-pressure water pump complete the preset number of cycles or the high-pressure water pump receives a drain command, control the regulating valve to open the drain port so that the water in the cooling pipeline flows into the drain channel through the high-pressure water pump and the regulating valve; S320. When the flow meter detects that the outlet flow rate of the cooling pipeline is 0 L / min and lasts for a sixth preset time, close the regulating valve to complete the draining operation.

[0044] In this embodiment, the regulating valve integrates a drain port, and the drain port is connected to the drain channel. In this embodiment, the sixth preset time is set to 10 seconds. In practical applications, when the high-pressure water pump completes 1000 cycles or receives a drain command, the system controls the regulating valve to switch to the drain port, and the cooling water in the cooling pipeline flows into the drain channel through the high-pressure water pump and the regulating valve. The flow meter installed between the cooling pipeline and the high-pressure water pump continuously monitors the outlet flow rate of the cooling pipeline. When it detects that the outlet flow rate is 0 liters per minute and lasts for 10 seconds, the regulating valve is closed. For example, during the draining process, the flow meter shows that the flow rate gradually drops to 0 within 7 minutes and the valve is closed after 10 seconds, ensuring that there is no residual liquid in the cooling pipeline.

[0045] The control method for the start-stop durability test of the high-pressure water pump 50 in the embodiment of the present invention has been described above. Next, the control system for the start-stop durability test of the high-pressure water pump 50 in the embodiment of the present invention will be described. Please refer to Figure 10 , an embodiment of the control system for the start-stop durability test of the high-pressure water pump 50 in the embodiment of the present invention includes: A high-pressure water pump 50, a water tank 20, and a cooling pipeline 10. The inlet of the cooling pipeline 10 is connected to the outlet 52 of the high-pressure water pump, and the outlet of the cooling pipeline 10 is respectively connected to the interface 21 of the water tank and the inlet 51 of the high-pressure water pump. A pressure relief valve 23 and a water replenishing valve 22 are provided at the top of the water tank 20; Three-way valve 90, regulating valve 60, heater 70 and high-temperature fan 80. The three-way valve 90 has a small-circulation inlet 92, a large-circulation inlet 91 and an outlet. The outlet 93 of the three-way valve is connected to the cooling pipeline 10 through a pipeline. The small-circulation inlet 92 and the large-circulation inlet 91 of the three-way valve 90 are respectively connected to the regulating valve 60 through two pipelines. The heater 70 is arranged on the pipeline connecting the small-circulation inlet 92 and the regulating valve 60. The high-temperature fan 80 is arranged on the pipeline connecting the large-circulation inlet 91 and the regulating valve 60. The regulating valve 60 has a drain port 61 for connecting a drain channel; Temperature sensor, liquid-level sensor 40, rotational-speed sensor and flowmeter 30; The temperature sensor is arranged between the heater 70 and the cooling pipeline 10. The liquid-level sensor 40 is arranged at the bottom of the water tank 20. The rotational-speed sensor is connected to the high-pressure water pump 50. The flowmeter 30 is arranged between the cooling pipeline 10 and the high-pressure water pump 50; Controller, which is electrically connected to the high-pressure water pump 50, three-way valve 90, regulating valve 60, heater 70, high-temperature fan 80, temperature sensor, liquid-level sensor 40, rotational-speed sensor and flowmeter 30 respectively, and is used to control the high-pressure water pump 50, three-way valve 90, regulating valve 60, heater 70, high-temperature fan 80, temperature sensor, liquid-level sensor 40, rotational-speed sensor and flowmeter 30, so as to implement the steps of the control method for the start-stop durability test of the high-pressure water pump 50 as described in any one of the above embodiments.

[0046] In this embodiment, the control system for the start-stop durability test of the high-pressure water pump 50 is a water circulation system composed of the high-pressure water pump 50, the water tank 20, the cooling pipeline 10, the three-way valve 90, the regulating valve 60, the heater 70, and the high-temperature fan 80. Among them, the outlet 93 of the three-way valve is connected to the cooling pipeline 10, and its small-circulation inlet 92 and large-circulation inlet 91 are respectively connected to the regulating valve 60 through pipelines. The heater 70 is arranged on the pipeline between the small-circulation inlet 92 and the regulating valve 60, and the high-temperature fan 80 is arranged on the pipeline between the large-circulation inlet 91 and the regulating valve 60, forming independent small-circulation and large-circulation paths. Among them, a temperature sensor is arranged between the heater 70 and the cooling pipeline 10 to detect the water temperature of the cooling pipeline 10; a liquid-level sensor 40 is arranged at the bottom of the water tank 20 to monitor the liquid level of the water tank 20; a pressure relief valve 23 is arranged at the top of the water tank 20 to release the pressure of the water tank 20 to the external environment; a water replenishing valve 22 is arranged at the top of the water tank 20 to inject water into the water tank 20 during startup; the high-pressure water pump 50 is connected with a rotational speed sensor to monitor the actual rotational speed of the high-pressure water pump 50. The regulating valve 60 has a drain port 61 for connecting to the drain channel, and when the high-pressure water pump 50 completes a preset cycle or receives a drain command, the drain port 61 of the regulating valve 60 discharges the cooling water into the drain channel; a flow meter 30 is arranged between the cooling pipeline 10 and the high-pressure water pump 50 to detect the outlet flow rate of the cooling pipeline 10.

[0047] It should be understood that the interface 21 of the water tank is connected to the cooling pipeline 10 and is used as a return channel to receive the coolant flowing back from the cooling pipeline 10. Its path is "water pump - regulating valve 60 - high-temperature fan 80 - heater 70 - three-way valve 90 - cooling pipeline 10 - interface 21 of the water tank", maintaining the closed-loop operation of the water circulation system; it is also used as an exhaust channel. When the cooling pipeline 10 generates pressure fluctuations due to the start and stop of the water pump, the interface 21 of the water tank can assist in discharging the air bubbles in the system and is used in conjunction with the pressure relief valve 23 at the top to avoid air resistance affecting the circulation efficiency. In addition, referring to Figure 10 , the outlet at the bottom of the water tank 20 is connected to the inlet 51 of the high-pressure water pump and is used to transport the coolant stored in the water tank 20 to the inlet 51 of the high-pressure water pump, providing a continuous coolant source for the high-pressure water pump 50 and maintaining the closed-loop operation of the water circulation system.

[0048] The controller is electrically connected to the high-pressure water pump 50, three-way valve 90, regulating valve 60, heater 70, high-temperature fan 80, temperature sensor, liquid level sensor 40, rotational speed sensor, and flowmeter 30 respectively. In practical applications, the controller receives the data from the liquid level sensor 40 and temperature sensor of the water tank 20, collects the pulse signals of the rotational speed sensor and flowmeter 30, and after data processing, controls each actuator through the digital output port: when the liquid level sensor 40 detects that the liquid level is lower than 15 cm for 10 seconds continuously, the controller sends an instruction to open the pressure relief valve 23 to relieve pressure to 1 bara, and then opens the water replenishing valve 22 to replenish water at a flow rate of 5 L / min; if the actual rotational speed feedback by the rotational speed sensor deviates from 6000 rpm by more than 300 rpm and lasts for 40 seconds, the system feedbacks an abnormal rotational speed state; if the abnormal state lasts for 5 seconds, the controller first cuts off the power supply of the heater 70 and starts the high-temperature fan 80 to cool down to 50 ± 2 °C, and then controls the shutdown. Its function is to integrate the monitoring data and control logic, realize the automatic operation of the water circulation system, and solve the system instability problems caused by liquid level fluctuations and abnormal rotational speeds in traditional tests by adjusting the flow path switching, thermal control components, and water replenishing operations in real time, ensuring the continuous and reliable test.

[0049] In summary, the interlocking control of the water replenishing valve 22 and the pressure relief valve 23 solves the problem of liquid level drop caused by exhaust in traditional tests, ensures sufficient coolant volume, and avoids the dry running of the water pump; through the multi-level protection strategy of "deviation monitoring - warning - cooling - shutdown", it prevents the performance attenuation caused by the long-term operation of the water pump at abnormal rotational speeds and maintains the dynamic stability of the circulation system; the controller integrates the data of each module to realize the full-process automation of "heating - circulation - water replenishing - protection - drainage", reduces the manual intervention error, solves the system fluctuation problems caused by manual water replenishing and drainage in traditional tests, and improves the reliability of the test.

[0050] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control method for the start-stop durability test of a high-pressure water pump, characterized in that, The high-pressure water pump is connected to the water tank and the cooling pipeline through a pipeline to form a water circulation system. The water circulation system also includes a three-way valve, a regulating valve, a heater and a high-temperature fan. The three-way valve has a small circulation inlet, a large circulation inlet and an outlet. The outlet of the three-way valve is connected to the cooling pipeline through a pipeline. The small circulation inlet and the large circulation inlet of the three-way valve are respectively connected to the regulating valve through two pipelines. The heater is provided on the pipeline connecting the small circulation inlet and the regulating valve. The high-temperature fan is provided on the pipeline connecting the large circulation inlet and the regulating valve. The control method for the start-stop endurance test of the high-pressure water pump includes: When entering the automatic circulation working state, the liquid level and pressure parameters of the water tank are monitored. When the liquid level is lower than the safe liquid level, the pressure parameter of the water tank is released to the safe pressure parameter, and the water tank is replenished with water; monitoring the actual speed of the high-pressure water pump, and triggering a failure protection function when a difference between the actual speed and the target speed exceeds a preset threshold; When the number of start-stop operations of the high-pressure water pump reaches a preset number of cycles, the water in the cooling pipeline is discharged to the drainage channel.

2. The control method for the start-stop durability test of a high-pressure water pump according to claim 1, characterized in that, A temperature sensor is provided between the heater and the cooling pipe. Before the step of entering the automatic circulation working condition, the method further comprises: Setting the preset number of cycles for starting and stopping the high-pressure water pump and the preset water temperature of the cooling pipeline; Starting the high-pressure water pump and adjusting it to run at a target speed, starting the heater, and only opening the small circulation inlet of the three-way valve so that the water in the cooling pipeline flows along the small circulation path; When the temperature sensor detects that the water temperature of the cooling pipeline reaches the preset water temperature, the small circulation inlet and the large circulation inlet of the three-way valve are opened at the same time, so that the water in the cooling pipeline flows according to the small circulation path and the large circulation path, entering the automatic circulation working state.

3. The control method for the start-stop durability test of the high-pressure water pump according to claim 2, characterized in that, The step of setting the preset number of cycles of starting and stopping the high-pressure water pump and the preset water temperature of the cooling pipeline includes: The preset number of cycles of starting and stopping the high-pressure water pump is set to 1000 times, and the preset water temperature of the cooling pipeline is set to 90°C.

4. The control method for the start-stop durability test of a high-pressure water pump according to claim 2, characterized in that, The step of starting the high-pressure water pump and adjusting it to run at a target speed includes: Starting the high-pressure water pump; Controlling the high-pressure water pump to accelerate from 0 rpm to a target speed, and stably operate at the target speed for a first preset time; When the high-pressure water pump runs stably for a first preset time, the high-pressure water pump is controlled to decelerate from the target speed to 0 rpm to complete a single speed cycle.

5. The control method for the start-stop durability test of a high-pressure water pump according to claim 1, characterized in that, The bottom of the water tank is provided with a liquid level sensor, which monitors the liquid level and pressure parameters of the water tank. When the liquid level is lower than the safe liquid level, the pressure parameter of the water tank is released to the safe pressure parameter, and the water tank is replenished with water, including: monitoring the liquid level of the water tank by means of the liquid level sensor; When the liquid level sensor detects that the liquid level in the water tank is lower than the safe liquid level and lasts for a second preset time, an alarm is issued and the water tank is replenished with water; When the liquid level sensor detects that the liquid level in the water tank is higher than the safe liquid level and lasts for a third preset time, the alarm is released and water replenishment to the water tank is stopped.

6. The control method for the start-stop durability test of a high-pressure water pump according to claim 5, wherein A pressure relief valve and a water replenishing valve are provided at the top of the water tank. The step of replenishing water to the water tank includes: Opening the pressure relief valve to release the pressure parameter of the water tank to a safe pressure parameter; Opening the water replenishing valve and controlling the water replenishing valve to inject water into the water tank at a preset flow rate until the liquid level sensor detects that the liquid level in the water tank is higher than the safe liquid level and lasts for a third preset time.

7. The control method for the start-stop durability test of the high-pressure water pump according to claim 6, characterized in that The step of stopping replenishing water to the water tank includes: Closing the pressure relief valve and the water replenishing valve to stop replenishing water to the water tank.

8. The control method for the start-stop durability test of a high-pressure water pump according to claim 1, characterized in that, The high-pressure water pump is connected with a rotational speed sensor. The step of triggering fail-safe protection when the difference between the actual rotational speed and the target rotational speed of the high-pressure water pump exceeds a preset threshold includes: Monitoring the actual rotational speed of the high-pressure water pump through the rotational speed sensor; Comparing the target rotational speed with the actual rotational speed. When the difference between the target rotational speed and the actual rotational speed exceeds a preset difference and the high-pressure water pump operates at the actual rotational speed for more than a fourth preset time, an abnormal rotational speed state is fed back; If the abnormal rotational speed state lasts for a fifth preset time, controlling the heater to stop heating, starting the high-temperature fan, cooling the water temperature in the cooling pipeline from the preset water temperature to the first water temperature, and then controlling the high-temperature fan and the high-pressure water pump to stop operating.

9. The control method for the start-stop durability test of a high-pressure water pump according to claim 1, characterized in that, The regulating valve has a drain port for connecting to a drain channel. A flow meter is provided between the cooling pipeline and the high-pressure water pump. The step of discharging the water in the cooling pipeline to the drain channel when the start-stop operation times of the high-pressure water pump reach a preset cycle number includes: When the start-stop operation times of the high-pressure water pump complete the preset cycle number or the high-pressure water pump receives a drainage instruction, controlling the regulating valve to open the drain port so that the water in the cooling pipeline flows into the drain channel through the high-pressure water pump and the regulating valve; When the flow meter detects that the outlet flow rate of the cooling pipeline is 0 L / min and lasts for a sixth preset time, closing the regulating valve to complete the drainage operation.

10. A control system for a high-pressure water pump start-stop durability test, characterized in that, The control system for the start-stop durability test of the high-pressure water pump includes: A high-pressure water pump, a water tank and a cooling pipeline. The inlet of the cooling pipeline is connected to the outlet of the high-pressure water pump, and the outlet of the cooling pipeline is respectively connected to the interface of the water tank and the inlet of the high-pressure water pump. A pressure relief valve and a water replenishing valve are provided at the top of the water tank; A three-way valve, a regulating valve, a heater and a high-temperature fan. The three-way valve has a small-circulation inlet, a large-circulation inlet and an outlet. The outlet of the three-way valve is connected to the cooling pipeline through a pipeline. The small-circulation inlet and the large-circulation inlet of the three-way valve are respectively connected to the regulating valve through two pipelines. The heater is arranged on the pipeline connecting the small-circulation inlet and the regulating valve, and the high-temperature fan is arranged on the pipeline connecting the large-circulation inlet and the regulating valve. The regulating valve has a drain port for connecting to a drain channel; Temperature sensor, liquid level sensor, rotational speed sensor and flowmeter; the temperature sensor is arranged between the heater and the cooling pipeline, the liquid level sensor is arranged at the bottom of the water tank, the rotational speed sensor is connected to the high-pressure water pump, and the flowmeter is arranged between the cooling pipeline and the high-pressure water pump; Controller, the controller is electrically connected to the high-pressure water pump, three-way valve, regulating valve, heater, high-temperature fan, temperature sensor, liquid level sensor, rotational speed sensor and flowmeter respectively, and is used to control the high-pressure water pump, three-way valve, regulating valve, heater, high-temperature fan, temperature sensor, liquid level sensor, rotational speed sensor and flowmeter, so as to implement the steps of the control method for the start-stop durability test of the high-pressure water pump as described in any one of claims 1 to 9.

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