Hydraulic control system, drainage vehicle and hydraulic control method

Abstract

The present application provides a hydraulic control system, a drainage vehicle, and a hydraulic control method. The hydraulic control system includes: an oil tank, a closed hydraulic system, a water pump, and a flushing system. Among them, the hydraulic control system also includes a regulating oil circuit and / or a heat dissipation system. The regulating oil circuit includes a regulating oil pump, the inlet of the regulating oil pump is connected to the oil tank, and the outlet of the regulating oil pump is connected to the oil replenishment pipeline, and is configured to transport oil to the closed circuit. The heat dissipation system is connected to the flushing system and the oil tank, and is configured to cool part of the oil drawn out of the flushing system and transport part of the cooled oil to the oil tank. The oil replenishment capacity of the hydraulic control system is improved, and the heat dissipation efficiency is enhanced.

Description

Technical Field

[0001] The present application relates to the field of hydraulic technology, and in particular to a hydraulic control system, a drainage vehicle and a hydraulic control method. Background Art

[0002] Drainage trucks are used for emergency drainage in urban waterlogging and flood disasters. The hydraulic control system is the vehicle's primary operating system. Traditional hydraulic control systems have insufficient oil replenishment capacity and low heat dissipation efficiency, impacting the normal and reliable operation of the hydraulic control system and the vehicle.

[0003] The above statements are only used to provide background technical information related to the present application and do not necessarily constitute prior art. Summary of the Invention

[0004] The purpose of this application is to provide a hydraulic control system, a drainage vehicle and a hydraulic control method, aiming to solve the problems of insufficient oil replenishment capacity and low heat dissipation efficiency of traditional hydraulic control systems, which affect the normal and reliable operation of the hydraulic control system and the drainage vehicle.

[0005] In a first aspect, the present application provides a hydraulic control system, comprising: an oil tank; a closed hydraulic system, comprising a closed pump, a working motor, an oil replenishing pump, a first pipeline, a second pipeline and an oil replenishing pipeline, the closed pump and the working motor are connected through the first pipeline and the second pipeline to form a closed loop, the inlet of the oil replenishing pump is connected to the oil tank, one end of the oil replenishing pipeline is connected to the outlet of the oil replenishing pump, and the other end is connected to at least one of the first pipeline and the second pipeline, and is configured to transport oil to the closed loop; a water pump, the working motor is driven and connected to the water pump; and a flushing system, connected to at least one of the first pipeline and the second pipeline, and is configured to draw out part of the oil in the closed loop; wherein the hydraulic control system also includes: an adjusting oil circuit, comprising an adjusting oil pump, the inlet of the adjusting oil pump is connected to the oil tank, the outlet of the adjusting oil pump is connected to the oil replenishing pipeline, and is configured to transport oil to the closed loop; and / or a heat dissipation system, connected to the flushing system and the oil tank, and configured to cool part of the oil drawn out by the flushing system and transport the cooled part of the oil to the oil tank.

[0006] In the hydraulic control system of some embodiments, the heat dissipation system includes a heat dissipation motor, the heat dissipation motor is configured to drive or accelerate the operation of the heat dissipation system, and the regulating oil pump is configured to deliver oil to the heat dissipation motor.

[0007] In the hydraulic control system of some embodiments, the flushing system includes a flushing valve and a flushing switching valve, the inlet of the flushing valve is connected to the first pipeline and the second pipeline respectively through the flushing switching valve, and the flushing switching valve is configured to connect one of the first pipeline and the second pipeline to the inlet of the flushing valve while disconnecting the other; and / or the cooling system also includes a radiator and a fan, the radiator is connected to the outlet of the flushing valve and the oil tank respectively, the cooling motor is connected to the fan drive, and the fan is configured to accelerate the heat dissipation of the radiator.

[0008] In the hydraulic control system of some embodiments, the regulating oil circuit also includes a multi-way valve, which is connected between the outlet of the regulating oil pump and the oil replenishing pipeline and the heat dissipation motor. The multi-way valve controls whether the oil at the outlet of the regulating oil pump flows to the oil replenishing pipeline and / or the heat dissipation motor.

[0009] In the hydraulic control system of some embodiments, the multi-way valve includes: an oil replenishing branch control valve, connected between the outlet of the regulating oil pump and the oil replenishing pipeline, and configured to control whether the oil at the outlet of the regulating oil pump flows to the oil replenishing pipeline; and a heat dissipation branch control valve, connected between the outlet of the regulating oil pump and the inlet of the heat dissipation motor, and configured to control whether the oil at the outlet of the regulating oil pump flows to the heat dissipation motor.

[0010] In the hydraulic control system of some embodiments, the multi-way valve includes a heat sink motor pressure limiting valve connected between an inlet of the heat sink motor and the oil tank and configured to limit the pressure of the heat sink motor.

[0011] In some embodiments of the hydraulic control system, the hydraulic control system also includes: a detection device, configured to detect working parameters of the hydraulic control system; and a control device, coupled to the detection device, the closed pump, the oil replenishment pump, the regulating oil pump, the flushing valve of the flushing system and the heat dissipation motor, and configured to control the operation of at least one of the closed pump, the oil replenishment pump, the regulating oil pump, the flushing system and the heat dissipation motor according to the working parameters.

[0012] In the hydraulic control system of some embodiments, the control device is configured to adjust the flow rate of oil delivered by the oil pump to the oil replenishment line and / or the heat dissipation motor through the multi-way valve according to the operating parameters.

[0013] In the hydraulic control system of some embodiments, the detection device includes: a first pressure P1 sensor, configured to detect a first pressure P1 of the oil at the outlet of the closed pump, the working parameters including the first pressure P1; and / or a second pressure P2 sensor, configured to detect a second pressure P2 of the oil in the oil replenishment line, the working parameters including the second pressure P2; and / or a third pressure P3 sensor, configured to detect a third pressure P3 of the water flow at the outlet of the water pump, the working parameters including the third pressure P3; and / or a first temperature sensor, configured to detect a third temperature of the oil in the oil tank. A temperature T1, the working parameters include the first temperature T1; and / or a second temperature sensor, configured to detect the second temperature T2 of the oil at the inlet of the cooling system, the working parameters include the second temperature T2; and / or a third temperature sensor, configured to detect the third temperature T3 of the leakage oil of the closed pump, the working parameters include the third temperature T3; and / or a fourth temperature sensor, configured to detect the fourth temperature T4 of the leakage oil of the working motor, the working parameters include the fourth temperature T4; and / or a speed sensor, configured to detect the speed of the water pump, the working parameters include the speed.

[0014] In some embodiments of the hydraulic control system, the hydraulic control system further includes an alarm device, and the control device is signal-connected to the alarm device and is configured to control the operation of the alarm device according to operating parameters.

[0015] A second aspect of the present application provides a drainage vehicle, comprising the hydraulic control system of the first aspect of the present application.

[0016] The third aspect of the present application provides a hydraulic control method based on the hydraulic control system of the first aspect of the present application, including adjusting the oil pump to deliver oil to the oil replenishment pipeline; and / or the flushing system draws out part of the oil in the closed circuit, the heat dissipation system cools part of the oil drawn out by the flushing system and delivers the cooled part of the oil to the oil tank.

[0017] In the hydraulic control method of some embodiments, the heat dissipation system includes a heat dissipation motor, and the regulating oil pump is driven and connected to the heat dissipation motor; part of the oil drawn out from the cooling and flushing system of the heat dissipation system includes driving the heat dissipation motor through the regulating oil pump to drive or accelerate the operation of the heat dissipation system.

[0018] In the hydraulic control method of some embodiments, the regulating oil circuit also includes a multi-way valve, which is connected between the outlet of the regulating oil pump and the oil replenishing pipeline and the cooling system; the hydraulic control method includes controlling whether the oil at the outlet of the regulating oil pump flows to the oil replenishing pipeline and / or the cooling motor through the multi-way valve.

[0019] In the hydraulic control method of some embodiments, operation of at least one of the closed-loop pump, the charge pump, the regulating oil pump, the flushing system, and the heat dissipation motor is controlled according to operating parameters of the hydraulic control system.

[0020] In some embodiments of the hydraulic control method, the hydraulic control method includes an oil quantity adjustment step, which includes adjusting the flow rate of oil delivered by the oil pump to the oil replenishment line and / or the heat dissipation motor through a multi-way valve according to working parameters.

[0021] In the hydraulic control method of some embodiments, the oil quantity adjustment step includes: providing a basic working condition database, the basic working condition database includes multiple sets of basic working condition data, the multiple sets of basic working condition data include working parameters under different working conditions when the water pump is operating normally, and the working parameters under different working conditions during normal operation include water pump flow and water pump head; obtaining actual working condition data when the water pump is actually operating, the actual working condition data are the working parameters during actual operation, and the working parameters during actual operation include water pump flow and water pump head; taking the water pump flow and water pump head in the multiple sets of basic working condition data that are closest to the water pump flow and water pump head in the actual working condition data as the closest basic working condition data, and when the deviation between the actual working condition data and the closest basic working condition data is outside the preset deviation range, the flow rate of oil delivered by the oil pump to the oil replenishment pipeline and / or the cooling system is adjusted by the multi-way valve to make the deviation within the preset deviation range.

[0022] In the hydraulic control method of some embodiments, the basic operating condition database is updated once after each preset running time, and the multiple sets of basic operating condition data in the updated basic operating condition database include the working parameters of the water pump under different operating conditions when it is operating normally at the update time point.

[0023] In some embodiments of the hydraulic control method, the working parameters of the basic working condition data and the actual working condition data also include at least one of the following parameters: a first pressure P1 of the oil at the outlet of the closed pump; a second pressure P2 of the oil in the oil supply line; a first temperature T1 of the oil in the oil tank; a second temperature T2 of the oil at the inlet of the cooling system; a third temperature T3 of the leakage oil of the closed pump; a first temperature difference T20, the first temperature difference T20 being the difference between the second temperature T2 and the first temperature T1; a second temperature difference T30, the second temperature difference T30 being the difference between the third temperature T3 and the first temperature T1; and a third temperature difference T40, the third temperature difference T40 being the difference between the fourth temperature T4 and the first temperature T1, the fourth temperature T4 being the temperature of the leakage oil of the working motor.

[0024] In the hydraulic control method of some embodiments, when the first temperature T1 increases, the oil quantity adjustment step includes: increasing the flow rate of the oil pump to the oil replenishment pipeline through the multi-way valve; and / or increasing the flow rate of the oil pump to the cooling motor through the multi-way valve.

[0025] In the hydraulic control method of some embodiments, the oil quantity adjustment step is performed when the first temperature T1 is between a first preset temperature value and a second preset temperature value; wherein the first preset temperature value is less than the second preset temperature value.

[0026] In the hydraulic control method of some embodiments, when the first temperature T1 is less than a first preset temperature value, the hydraulic control method further includes a step of shutting down the heat dissipation motor; and / or when the first temperature T1 is greater than a second preset temperature value, the hydraulic control method further includes a step of adjusting the closed pump load, and the step of adjusting the closed pump load includes causing the closed pump to operate at less than 100% load for at least part of the time period.

[0027] In some embodiments of the hydraulic control method, after the closed pump load adjustment step is executed for a first preset period of time, if the first temperature T1 is greater than a third preset temperature value, the machine is shut down for inspection, and the third preset temperature value is greater than the second preset temperature value.

[0028] In the hydraulic control method of some embodiments, when the second temperature difference T30 is between the first preset temperature difference and the second preset temperature difference, the oil quantity adjustment step includes increasing the flow rate of oil delivered by the regulating oil pump to the oil supply pipeline, and the ratio of the increase amount to the flow rate of oil delivered by the oil supply pump is greater than or equal to the first preset ratio and less than or equal to the second preset ratio; when the second temperature difference T30 is greater than the second preset temperature difference, the oil quantity adjustment step includes increasing the flow rate of oil delivered by the regulating oil pump to the oil supply pipeline, and the ratio of the increase amount to the flow rate of oil delivered by the oil supply pump is greater than or equal to the second preset ratio and less than or equal to 100%.

[0029] In some embodiments of the hydraulic control method, the deviation is a function of at least one of a first difference between the first pressure P1 of the actual operating condition data and the first pressure P1 of the closest basic operating condition data, a second difference between the first temperature difference T20 of the actual operating condition data and the first temperature difference T20 of the closest basic operating condition data, a third difference between the second temperature difference T30 of the actual operating condition data and the second temperature difference T30 of the closest basic operating condition data, and a fourth difference between the third temperature difference T40 of the actual operating condition data and the third temperature difference T40 of the closest basic operating condition data.

[0030] In some embodiments of the hydraulic control method, the deviation is a dimensionless weighted root mean square value of at least two of the first difference, the second difference, the third difference, and the fourth difference.

[0031] In some embodiments of the hydraulic control method, the weight of the dimensionless weighted root mean square value is dynamically adjusted according to the operating time of the hydraulic regulation system, and the weight of the first difference value decreases successively.

[0032] In some embodiments of the hydraulic control method, the oil quantity adjustment step includes: when the deviation is less than a first preset deviation value, maintaining the flow rate of oil delivered by the regulating oil pump to the oil supply pipeline unchanged; when the deviation is between the first preset deviation value and a second preset deviation value, adjusting the flow rate of oil delivered by the regulating oil pump to the oil supply pipeline, wherein the second preset deviation value is greater than the first preset deviation value; when the deviation is greater than the second preset deviation value, adjusting the closed pump so that the closed pump operates at less than 100% load for at least part of the time period.

[0033] In some embodiments of the hydraulic control method, the hydraulic control system includes an alarm device; the hydraulic control method includes an alarm step, the alarm step including: when the second temperature difference T30 continues to exceed the third preset temperature difference within the second preset time period, and the second pressure P2 is within the preset range, the alarm device is controlled to alarm; and / or when the third temperature difference T40 continues to exceed the fourth preset temperature difference within the third preset time period, and the second pressure P2 is within the preset range, the alarm device is controlled to alarm.

[0034] In the hydraulic control method of some embodiments, when the first temperature difference T20 is greater than the fifth preset temperature difference, the hydraulic control method includes a flushing valve adjustment step, which includes controlling the flushing valve to increase the flow rate of part of the oil in the closed circuit by a third preset proportion.

[0035] In some embodiments of the hydraulic control method, the hydraulic control method includes: shutting down for inspection when the first temperature difference T20 continues to exceed a preset temperature difference range within a fourth preset time period.

[0036] In the hydraulic control system provided by the present application, an adjusting oil circuit is provided, and the adjusting oil circuit includes an adjusting oil pump, the outlet of the adjusting oil pump is connected to the oil replenishment pipeline, and the adjusting oil pump delivers oil to the closed circuit, thereby improving the oil replenishment capacity of the hydraulic control system and enhancing the heat dissipation capacity of the hydraulic control system, thereby extending the service life of the hydraulic control system components and the continuous operation time of the hydraulic control system, so that the hydraulic control system can cope with more working conditions. By providing a heat dissipation system, and the heat dissipation system is used to cool part of the oil drawn out of the flushing system and deliver the cooled part of the oil to the oil tank, more heat dissipation paths are provided for the hydraulic control system, thereby improving the heat dissipation capacity of the hydraulic control system and facilitating more stable operation of the hydraulic control system.

[0037] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0039] Figure 1 This is a system schematic diagram of a hydraulic control system according to an embodiment of the present application.

[0040] Figure 2 for Figure 1 A local enlarged view of K.

[0041] Figure 3 for Figure 1 A flow chart of a hydraulic control method of a hydraulic control system is shown.

[0042] Figure 4 for Figure 1 A control principle block diagram of the hydraulic control system of the illustrated embodiment.

[0043] Figures 1 to 4 In the figure, each reference numeral represents:

[0044] 1. Closed hydraulic system; 101. Closed pump; 101A. First closed pump interface; 101B. Second closed pump interface; 102. Working motor; 102A. First working motor interface; 102B. Second working motor interface; 103. Water pump; 104. Charge pump; 111. First pipeline; 112. Second pipeline; 113. Charge pipeline; 2. Regulating oil circuit; 21. Regulating oil pump; 22. Multi-way valve; 221. Charge branch control valve; 222. Heat dissipation branch control valve; 223 , cooling motor pressure limiting valve; 3. Cooling system; 31. Radiator; 32. Cooling motor; 33. Fan; 4. Flushing system; 41. Flushing valve; 42. Flushing switching valve; 5. Fuel tank; 6. Detection device; 61. First pressure sensor; 62. Second pressure sensor; 63. Third pressure sensor; 64. First temperature sensor; 65. Second temperature sensor; 66. Third temperature sensor; 67. Fourth temperature sensor; 68. Speed ​​sensor; 7. Control device; 8. Alarm device. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0046] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. Technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, technology, methods and equipment should be considered as part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0047] In the description of this application, it should be understood that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0048] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0049] In addition, when an element is referred to as being “on” another element, the element may be directly on the other element or may be indirectly on the other element with one or more intervening elements interposed therebetween. In addition, when an element is referred to as being “connected to” another element, the element may be directly connected to the other element or may be indirectly connected to the other element with one or more intervening elements interposed therebetween. Hereinafter, the same reference numerals denote the same elements.

[0050] Unless the content requires otherwise, throughout the following description, the word "include" and variations such as "comprising" and "having" are to be interpreted in an open and inclusive sense, that is, as in "including but not limited to".

[0051] The term "multiple" as used in this application refers to more than two (including two). Similarly, the term "multiple groups" refers to more than two (including two).

[0052] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0053] like Figures 1 to 4 As shown, the hydraulic control system of an embodiment of the present application includes a fuel tank 5, a closed hydraulic system 1, a water pump 103, and a flushing system 4. The closed hydraulic system 1 includes a closed pump 101, a working motor 102, a charge pump 104, a first pipeline 111, a second pipeline 112, and a charge pipeline 113. The closed pump 101 and the working motor 102 are connected via the first pipeline 111 and the second pipeline 112 to form a closed circuit. The inlet of the charge pump 104 is connected to the fuel tank 5. One end of the charge pipeline 113 is connected to the outlet of the charge pump 104 and the other end is connected to at least one of the first pipeline 111 and the second pipeline 112, configured to deliver oil to the closed circuit. The working motor 102 is drive-connected to the water pump 103. The flushing system 4 is connected to at least one of the first pipeline 111 and the second pipeline 112 and is configured to drain some of the oil in the closed circuit. The hydraulic control system also includes a regulating oil circuit 2 and / or a heat dissipation system 3. The regulating oil circuit 2 includes a regulating oil pump 21, the inlet of which is connected to the oil tank 5, and the outlet of which is connected to the oil replenishment line 113. The regulating oil circuit 2 is configured to deliver oil to the closed circuit. The cooling system 3 is connected to the flushing system 4 and the oil tank 5, and is configured to cool a portion of the oil drawn from the flushing system 4 and deliver the cooled portion of the oil to the oil tank 5.

[0054] By providing a regulating oil circuit that includes a regulating oil pump, the outlet of which is connected to the oil replenishment line, and the regulating oil pump delivering oil to the closed circuit, the hydraulic control system's oil replenishment capacity is improved, and the hydraulic control system's heat dissipation capacity is enhanced, thereby extending the service life of the hydraulic control system components and the continuous operation time of the hydraulic control system, allowing the hydraulic control system to cope with more working conditions. By providing a heat dissipation system that is used to cool some of the oil drawn from the flushing system and deliver the cooled oil to the oil tank, the hydraulic control system is provided with more heat dissipation paths, thereby improving the hydraulic control system's heat dissipation capacity and facilitating more stable operation of the hydraulic control system.

[0055] like Figures 1 to 2 As shown, in the hydraulic control system of some embodiments, the heat dissipation system 3 includes a heat dissipation motor 32 , which is configured to drive or accelerate the operation of the heat dissipation system 3 , and the regulating oil pump 21 is configured to deliver oil to the heat dissipation motor 32 .

[0056] By adjusting the oil pump 21 to deliver oil to the heat dissipation motor 32, the operation of the heat dissipation system 3 is controlled by controlling the oil pump 21, thereby improving the heat dissipation efficiency of the hydraulic control system and helping to extend the service life of the hydraulic system.

[0057] like Figures 1 to 2 As shown, in some embodiments of the hydraulic control system, the flushing system 4 includes a flushing valve 41 and a flushing switching valve 42, the inlet of the flushing valve 41 is connected to the first pipeline 111 and the second pipeline 112 respectively through the flushing switching valve 42, and the flushing switching valve 42 is configured to connect one of the first pipeline 111 and the second pipeline 112 to the inlet of the flushing valve 41 while disconnecting the other; and / or the cooling system 3 also includes a radiator 31 and a fan 33, the radiator 31 is connected to the outlet of the flushing valve 41 and the oil tank 5 respectively, the cooling motor 32 is driven and connected to the fan 33, and the fan 33 is configured to accelerate the heat dissipation of the radiator 31.

[0058] By providing a flushing valve 41, and connecting the inlet of the flushing valve 41 to the first pipeline 111 and the second pipeline 112 respectively through the flushing switching valve 42, a portion of the oil in the closed circuit can be led through the flushing valve 41 to the heat dissipation system 3 for cooling. By providing the flushing switching valve 42, and configuring the flushing switching valve 42 to connect one of the first pipeline 111 and the second pipeline 112 to the inlet of the flushing valve 41 while disconnecting the other, the flushing switching valve 42 can control the connection between the first pipeline 111 or the second pipeline 112 and the flushing valve 41, thereby controlling a portion of the oil in the first pipeline 111 or the second pipeline 112 to be led through the flushing valve 41 to the heat dissipation system 3 for cooling. By setting up a radiator 31, a cooling motor 32 and a fan 33, and the radiator 31 is respectively connected to the outlet of the flushing valve 41 and the oil tank 5, and the cooling motor 32 is driven by the fan 33, the radiator 31 cools the oil led out into the cooling system 3 through the flushing valve 41, and the fan 33 can accelerate the heat dissipation of the radiator 31.

[0059] like Figures 1 to 2 As shown, in the hydraulic control system of some embodiments, the regulating oil circuit 2 also includes a multi-way valve 22, which is connected between the outlet of the regulating oil pump 21 and the oil replenishing pipeline 113 and the heat dissipation motor 32. The multi-way valve 22 controls whether the oil at the outlet of the regulating oil pump 21 flows to the oil replenishing pipeline 113 and / or the heat dissipation motor 32.

[0060] By providing a multi-way valve 22, and connecting the multi-way valve 22 between the outlet of the regulating oil pump 21 and the oil replenishment pipeline 113 and the cooling system 3, the multi-way valve 22 can control whether the oil at the outlet of the regulating oil pump 21 flows to the oil replenishment pipeline 113 and / or the cooling system 3, so that the hydraulic control system can increase or decrease the oil in the oil replenishment pipeline 113 or increase or decrease the heat dissipation of the cooling system 3 as needed by controlling the direction of the oil at the outlet of the regulating oil pump 21, thereby improving the oil replenishment capacity of the hydraulic control system and improving the heat dissipation capacity of the hydraulic control system.

[0061] like Figures 1 to 2As shown, in some embodiments of the hydraulic control system, the multi-way valve 22 includes an oil-supply branch control valve 221 and a heat dissipation branch control valve 222. The oil-supply branch control valve 221 is connected between the outlet of the regulating oil pump 21 and the oil-supply line 113 and is configured to control whether the oil at the outlet of the regulating oil pump 21 flows to the oil-supply line 113. The heat dissipation branch control valve 222 is connected between the outlet of the regulating oil pump 21 and the inlet of the heat dissipation motor 32 and is configured to control whether the oil at the outlet of the regulating oil pump 21 flows to the heat dissipation motor 32.

[0062] By providing an oil replenishment branch control valve 221 connected between the outlet of the regulating oil pump 21 and the oil replenishment line 113, it is possible to control whether the oil at the outlet of the regulating oil pump 21 flows to the oil replenishment line 113, thereby improving the oil replenishment capability of the hydraulic control system. By providing a heat dissipation branch control valve 222 connected between the outlet of the regulating oil pump 21 and the inlet of the heat dissipation motor 32, it is possible to control whether the oil at the outlet of the regulating oil pump 21 flows to the heat dissipation motor 32, thereby improving the heat dissipation capability of the hydraulic control system.

[0063] like Figures 1 to 2 As shown, in the hydraulic control system of some embodiments, the multi-way valve 22 includes a heat dissipation motor pressure limiting valve 223, which is connected between the inlet of the heat dissipation motor 32 and the oil tank 5 and is configured to limit the pressure of the heat dissipation motor 32.

[0064] By setting the cooling motor pressure limiting valve 223 to be connected between the inlet of the cooling motor 32 and the oil tank 5, the hydraulic control system can limit the pressure of the cooling motor 32 through the cooling motor pressure limiting valve 223, thereby ensuring that the pressure of the cooling motor 32 is within a normal range and maintaining the normal operation of the hydraulic control system.

[0065] like Figure 4 As shown, in some embodiments of the hydraulic control system, the hydraulic control system further includes a detection device 6 and a control device 7. The detection device 6 is configured to detect operating parameters of the hydraulic control system; the control device 7 is coupled to the detection device 6, the closed-loop pump 101, the charge pump 104, the regulating oil pump 21, the flushing valve 41 of the flushing system 4, and the heat dissipation motor 32, and is configured to control the operation of at least one of the closed-loop pump 101, the charge pump 104, the regulating oil pump 21, the flushing system 4, and the heat dissipation motor 32 according to the operating parameters.

[0066] By providing a detection device 6 for detecting the working parameters of the hydraulic control system and a control device 7 coupled to at least one of the detection device 6, the closed pump 101, the oil replenishing pump 104, the regulating oil pump 21, the flushing system 4 and the cooling motor 32, the control device 7 can control the operation of at least one of the closed pump 101, the oil replenishing pump 104, the regulating oil pump 21, the flushing system 4 and the cooling system 3 according to the working parameters, so that when the working parameters of the hydraulic control system change, the closed pump 101, the oil replenishing pump 104, the regulating oil pump 21, the flushing system 4 and the cooling system 3 can be adjusted accordingly, thereby improving the adaptability of the hydraulic control system to different working environments.

[0067] The control device 7 can be implemented as a general-purpose processor, a programmable logic controller (PLC), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any appropriate combination thereof for performing the functions described in the present disclosure.

[0068] like Figure 4 As shown, in the hydraulic control system of some embodiments, the control device 7 is configured to adjust the flow rate of oil delivered by the oil pump 21 to the oil replenishment line 113 and / or the heat dissipation motor 32 through the multi-way valve 22 according to working parameters.

[0069] The control device 7 adjusts the flow rate of oil delivered by the oil pump 21 to the oil replenishing pipeline 113 and / or the heat dissipation motor 32 through the multi-way valve 22 according to the working parameters, thereby automatically adjusting the flow rate of oil delivered by the oil pump 21 to the oil replenishing pipeline 113 and / or the heat dissipation motor 32 according to the real-time working parameters, thereby ensuring the stable operation of the hydraulic control system.

[0070] like Figure 4As shown, in some embodiments of the hydraulic control system, the detection device 6 includes: a first pressure sensor 61, configured to detect a first pressure P1 of the oil at the outlet of the closed pump 101, and the working parameters include the first pressure P1; and / or a second pressure sensor 62, configured to detect a second pressure P2 of the oil in the oil replenishment line 113, and the working parameters include the second pressure P2; and / or a third pressure sensor 63, configured to detect a third pressure P3 of the water flow at the outlet of the water pump 103, and the working parameters include the third pressure P3; and / or a first temperature sensor 64, configured to detect a first temperature of the oil in the oil tank 5. Temperature T1, the working parameters include the first temperature T1; and / or the second temperature sensor 65, configured to detect the second temperature T2 of the oil at the inlet of the cooling system 3, the working parameters include the second temperature T2; and / or the third temperature sensor 66, configured to detect the third temperature T3 of the leakage oil of the closed pump 101, the working parameters include the third temperature T3; and / or the fourth temperature sensor 67, configured to detect the fourth temperature T4 of the leakage oil of the working motor 102, the working parameters include the fourth temperature T4; and / or the speed sensor 68, configured to detect the speed of the water pump 103, the working parameters include the speed.

[0071] The detection device 6 includes at least one of a first pressure sensor 61, a second pressure sensor 62, a third pressure sensor 63, a first temperature sensor 64, a second temperature sensor 65, a third temperature sensor 66, a fourth temperature sensor 67 and a speed sensor 68, which can detect the required working parameters, so as to facilitate the control device 7 to control at least one of the closed pump 101, the oil replenishment pump 104, the regulating oil pump 21, the flushing system 4 and the cooling system 3 according to appropriate working parameters, thereby comprehensively monitoring and accurately controlling the operating status of the hydraulic control system, thereby facilitating the hydraulic control system to adjust the oil replenishment and heat dissipation according to the working parameters.

[0072] like Figure 4 As shown, in some embodiments of the hydraulic control system, the hydraulic control system further includes an alarm device 8, and the control device 7 is signal-connected to the alarm device 8 and is configured to control the alarm device 8 to operate according to operating parameters.

[0073] By setting up an alarm device 8 that is signal-connected to the control device 7, the control device 7 controls the alarm device 8 to work according to the working parameters. When the hydraulic control system is in an emergency situation, the alarm device 8 can be triggered to work, thereby improving the ability of the hydraulic control system to cope with emergencies, avoiding damage to components due to extreme situations, and thus improving the life of the hydraulic control system.

[0074] like Figures 1 to 3 As shown, the second aspect of the present application provides a drainage vehicle, including the hydraulic control system of the first aspect of the present application.

[0075] The drainage vehicle of the embodiment of the present application has the same advantages as the hydraulic control system of the embodiment of the present application.

[0076] like Figures 1 to 3 As shown, the third aspect of the present application provides a hydraulic control method of the hydraulic control system based on the first aspect of the present application, including adjusting the oil pump 21 to deliver oil to the oil replenishment pipeline 113; and / or the flushing system 4 draws out part of the oil in the closed circuit, the heat dissipation system 3 cools part of the oil drawn out by the flushing system 4 and delivers the cooled part of the oil to the oil tank 5.

[0077] By adjusting the oil pump 21 to deliver oil to the oil replenishment pipeline 113; and / or the flushing system 4 draws out part of the oil in the closed circuit, multi-stage oil replenishment of the hydraulic control system is achieved, and the oil replenishment capacity and heat dissipation capacity of the hydraulic control system are improved, thereby extending the service life of the hydraulic control system components and the continuous operation time of the hydraulic control system, so that the hydraulic control system can cope with more working conditions.

[0078] like Figures 1 to 3 As shown, in the hydraulic control method of some embodiments, the cooling system 3 includes a cooling motor 32, and the regulating oil pump 21 is driven and connected to the cooling motor 32; part of the oil drawn out of the cooling and flushing system 4 of the cooling system 3 includes driving the cooling motor 32 through the regulating oil pump 21 to drive or accelerate the operation of the cooling system 3.

[0079] The cooling system 3 is driven to work by adjusting the oil pump 21 so that the cooling system 3 can be controlled to work by adjusting the oil pump 21 , thereby controlling the operation of the cooling system 3 according to the working condition of the hydraulic control system.

[0080] like Figures 1 to 3 As shown, in the hydraulic control method of some embodiments, the regulating oil circuit 2 also includes a multi-way valve 22, which is connected between the outlet of the regulating oil pump 21 and the oil replenishing pipeline 113 and the cooling system 3; the hydraulic control method includes controlling whether the oil at the outlet of the regulating oil pump 21 flows to the oil replenishing pipeline 113 and / or the cooling motor 32 through the multi-way valve 22.

[0081] The multi-way valve 22 is used to control whether the oil at the outlet of the regulating oil pump 21 flows to the oil replenishment pipeline 113 and / or the heat dissipation system 3, so that the hydraulic control system can control the direction of the oil at the outlet of the regulating oil pump 21 or increase or decrease the oil in the oil replenishment pipeline 113 or increase or decrease the heat dissipation of the heat dissipation system 3 as needed, thereby realizing multi-stage oil replenishment of the hydraulic control system and improving the oil replenishment capacity and heat dissipation effect of the hydraulic control system.

[0082] like Figures 1 to 3As shown, in the hydraulic control method of some embodiments, at least one of the closed pump 101, the charge pump 104, the regulating oil pump 21, the flushing system 4 and the heat dissipation motor 32 is controlled to operate according to the operating parameters of the hydraulic control system.

[0083] At least one of the closed pump 101, the oil charge pump 104, the regulating oil pump 21, the flushing system 4 and the heat dissipation motor 32 is controlled to operate according to the working parameters of the hydraulic control system, so that when the working parameters of the hydraulic control system change, the closed pump 101, the oil charge pump 104, the regulating oil pump 21, the flushing system 4 and the heat dissipation system 3 can be adjusted accordingly, thereby improving the adaptability of the hydraulic control system to different working environments.

[0084] like Figures 1 to 3 As shown, in some embodiments of the hydraulic control method, the hydraulic control method includes an oil quantity adjustment step, which includes adjusting the flow rate of oil delivered by the oil pump 21 to the oil replenishment line 113 and / or the heat dissipation motor 32 through the multi-way valve 22 according to the working parameters.

[0085] The flow rate of oil delivered by the oil pump 21 to the oil replenishing line 113 and / or the heat dissipation motor 32 is adjusted by the multi-way valve 22 according to the working parameters, so that the hydraulic control system can automatically optimize the flow rate of oil delivered by the oil pump 21 to the oil replenishing line 113 and / or the heat dissipation motor 32 according to the real-time working parameters, thereby ensuring the stable operation of the hydraulic control system.

[0086] like Figures 1 to 3 As shown, in some embodiments of the hydraulic control method, the oil quantity adjustment step includes: providing a basic working condition database, the basic working condition database includes multiple groups of basic working condition data, the multiple groups of basic working condition data include working parameters of the water pump 103 under different working conditions when it is operating normally, and the working parameters under different working conditions during normal operation include water pump flow and water pump head; obtaining actual working condition data of the water pump 103 when it is actually operating, the actual working condition data are the working parameters during actual operation, and the working parameters during actual operation include water pump flow and water pump head; taking the water pump flow and water pump head in the multiple groups of basic working condition data that are closest to the water pump flow and water pump head in the actual working condition data as the closest basic working condition data, and when the deviation between the actual working condition data and the closest basic working condition data is outside the preset deviation range, adjusting the flow rate of oil delivered by the oil pump 21 to the oil replenishment pipeline 113 and / or the cooling system 3 through the multi-way valve 22 to make the deviation within the preset deviation range.

[0087] When the deviation between the actual working condition data and the closest basic working condition data is outside the preset deviation range, the multi-way valve 22 adjusts the flow rate of oil delivered by the oil pump 21 to the oil replenishment pipeline 113 and / or the cooling system 3 to make the deviation within the preset deviation range, which is beneficial for the actual working condition data to always be maintained within the reasonable range of the basic working condition data, thereby keeping the hydraulic control system within the normal working range.

[0088] like Figures 1 to 3 As shown, in the hydraulic control method of some embodiments, the basic working condition database is updated once after each preset running time, and the multiple groups of basic working condition data of the updated basic working condition database include the working parameters of the water pump 103 under different working conditions when it is operating normally at the update time point.

[0089] Since the basic operating condition database is updated every preset operating time, the multiple sets of basic operating condition data in the updated basic operating condition database include the operating parameters of the water pump 103 under different operating conditions when it is operating normally at the time of update. This allows the multiple sets of basic operating condition data in the basic operating condition database to be dynamically updated, avoiding errors caused by changes in the operating environment in the hydraulic control system and improving the response speed and stability of the hydraulic control system. In addition, the automatic updating of the basic operating condition database reduces the frequency of manual parameter adjustments, thereby improving the degree of automation and reducing manual operation costs.

[0090] like Figures 1 to 3 As shown, in some embodiments of the hydraulic control method, the working parameters of the basic working condition data and the actual working condition data also include at least one of the following parameters: a first pressure P1 of the oil at the outlet of the closed pump 101; a second pressure P2 of the oil in the oil replenishing line 113; a first temperature T1 of the oil in the oil tank 5; a second temperature T2 of the oil at the inlet of the cooling system 3; a third temperature T3 of the leakage oil of the closed pump 101; a first temperature difference T20, the first temperature difference T20 is the difference between the second temperature T2 and the first temperature T1; a second temperature difference T30, the second temperature difference T30 is the difference between the third temperature T3 and the first temperature T1; and a third temperature difference T40, the third temperature difference T40 is the difference between the fourth temperature T4 and the first temperature T1, and the fourth temperature T4 is the temperature of the leakage oil of the working motor 102.

[0091] By establishing multi-parameter basic working condition data and actual working condition data, intelligent evaluation and precise regulation of the operating status of the hydraulic control system are achieved, thereby ensuring the normal operation of the hydraulic control system.

[0092] like Figures 1 to 3As shown, in the hydraulic control method of some embodiments, when the first temperature T1 increases, the oil quantity adjustment step includes: increasing the flow rate of the oil pump 21 to the oil replenishment pipeline 113 through the multi-way valve 22; and / or increasing the flow rate of the oil pump 21 to the heat dissipation motor 32 through the multi-way valve 22.

[0093] When the first temperature T1 rises, the multi-way valve 22 increases the flow rate of oil delivered by the regulating oil pump 21 to the oil replenishment line 113. Furthermore, the multi-way valve 22 increases the flow rate of oil delivered by the regulating oil pump 21 to the cooling system 3 to increase the speed of the fan 33, thereby accelerating heat dissipation. This prevents performance degradation or component damage in the hydraulic control system due to excessive oil temperature. Furthermore, the hydraulic control system automatically adjusts its oil replenishment strategy as the ambient temperature changes, ensuring stable operation under various operating conditions and reducing the risk of failure.

[0094] like Figures 1 to 3 As shown, in some embodiments of the hydraulic control method, when the first temperature T1 is between a first preset temperature value and a second preset temperature value, the oil quantity adjustment step is performed; wherein the first preset temperature value is less than the second preset temperature value.

[0095] By executing the oil quantity adjustment step when the first temperature T1 is between the first preset temperature value and the second preset temperature value, multi-stage oil replenishment is achieved in the hydraulic control system, thereby improving the hydraulic control system's oil replenishment capability and ensuring normal operation of the hydraulic control system. Furthermore, by limiting the step of adjusting the flow rate of oil pump 21 to the oil replenishment line 113 and / or the cooling system 3 to only when the first temperature T1 is between the first preset temperature value and the second preset temperature value, different operations can be performed when the temperature is within different ranges, thereby avoiding energy waste when the first temperature T1 is low and preventing unnecessary responses of the hydraulic control system when an abnormality occurs.

[0096] like Figures 1 to 3 As shown, in the hydraulic control method of some embodiments, when the first temperature T1 is less than a first preset temperature value, the hydraulic control method further includes a step of shutting down the heat dissipation motor; and / or when the first temperature T1 is greater than a second preset temperature value, the hydraulic control method further includes a step of adjusting the closed pump load, and the step of adjusting the closed pump load includes making the closed pump 101 operate at a load lower than 100% for at least part of the time period.

[0097] When the first temperature T1 is less than a first predetermined temperature value, the heat dissipation motor 32 is turned off, thereby avoiding wasting energy when the first temperature T1 is low or preventing the first temperature T1 from being too low. When the first temperature T1 is greater than a second predetermined temperature value, the closed pump load adjustment step includes operating the closed pump 101 at less than 100% load for at least a portion of the time, thereby reducing the heat generated by the closed pump 101 and thereby lowering the temperature of the hydraulic control system oil.

[0098] like Figures 1 to 3 As shown, in some embodiments of the hydraulic control method, after the first preset time period of the closed pump load adjustment step, if the first temperature T1 is greater than the third preset temperature value, the machine is stopped for inspection, and the third preset temperature value is greater than the second preset temperature value.

[0099] By setting the shutdown inspection when the first temperature T1 is greater than the third preset temperature value, the hydraulic system can be effectively prevented from continuing to operate under abnormally high temperature conditions, thereby avoiding component damage or system failure caused by overheating, and helping to improve the safety and reliability of the hydraulic control system.

[0100] like Figures 1 to 3 As shown, in the hydraulic control method of some embodiments, when the second temperature difference T30 is between the first preset temperature difference and the second preset temperature difference, the oil quantity adjustment step includes increasing the flow rate of oil delivered by the regulating oil pump 21 to the oil supply line 113, and the ratio of the increase amount to the flow rate of oil delivered by the oil supply pump 104 is greater than or equal to the first preset ratio and less than or equal to the second preset ratio; when the second temperature difference T30 is greater than the second preset temperature difference, the oil quantity adjustment step includes increasing the flow rate of oil delivered by the regulating oil pump 21 to the oil supply line 113, and the ratio of the increase amount to the flow rate of oil delivered by the oil supply pump 104 is greater than or equal to the second preset ratio and less than or equal to 100%.

[0101] By setting the hydraulic control system to increase the flow rate of oil delivered by the regulating oil pump 21 to the oil charge line 113 when the second temperature difference T30 is between the first preset temperature difference and the second preset temperature difference, the hydraulic control system improves the oil charge volume and heat dissipation of the hydraulic control system. By setting the hydraulic control system to increase the flow rate of oil delivered by the regulating oil pump 21 to the oil charge line 113 when the second temperature difference T30 is greater than the second preset temperature difference, with the ratio of the increased flow rate to the flow rate of oil delivered by the oil charge pump 104 being greater than or equal to a second preset ratio and less than or equal to 100%, when the second temperature difference T30 is greater, the efficiency of regulating the oil charge volume and heat dissipation of the hydraulic control system can be improved by further increasing the flow rate of oil delivered by the oil charge pump 104, thereby facilitating the maintenance of the stability of the hydraulic control system.

[0102] like Figures 1 to 3As shown, in the hydraulic control method of some embodiments, the deviation of the actual working condition data from the closest basic working condition data is a function of at least one of a first difference between the first pressure P1 of the actual working condition data and the first pressure P1 of the closest basic working condition data, a second difference between the first temperature difference T20 of the actual working condition data and the first temperature difference T20 of the closest basic working condition data, a third difference between the second temperature difference T30 of the actual working condition data and the second temperature difference T30 of the closest basic working condition data, and a fourth difference between the third temperature difference T40 of the actual working condition data and the third temperature difference T40 of the closest basic working condition data.

[0103] When the deviation between the actual operating condition data and the closest baseline operating condition data is controlled between a first preset deviation value and a second preset deviation value, the flow rate of oil delivered by the regulating oil pump 21 to the oil charge line 113 is increased. By comprehensively considering various parameters, multi-parameter coordinated control of the hydraulic control system is achieved, facilitating achieving the desired control target by regulating the oil pump 21 while maintaining the required load of the closed-loop pump 101. When the deviation exceeds the second preset deviation value, the load on the closed-loop pump 101 is reduced, thereby reducing heat generation in the hydraulic control system and rapidly lowering the first temperature T1 of the hydraulic control system. This allows for timely heat dissipation in the event of significant deviations in the hydraulic control system, maintaining stable operation.

[0104] like Figures 1 to 3 As shown, in some embodiments of the hydraulic control method, the deviation is a dimensionless weighted root mean square value of at least two of the first difference, the second difference, the third difference, and the fourth difference.

[0105] Since the deviation is the dimensionless weighted root mean square value of at least two of the first difference, the second difference, the third difference and the fourth difference, it is suitable for multi-parameter comprehensive evaluation of the performance of the hydraulic control system under different environments, and is convenient for providing a unified judgment basis.

[0106] Taking the dimensionless weighted root mean square value of the first difference and the second difference as an example, the calculation formula of the deviation D is:

[0107] D=

[0108] k1 and k2 are coefficients greater than 0, and their sum is 1. P1 is the first pressure of the actual working condition data, P1 base is the first pressure of the closest basic working condition data, T20 is the first temperature difference of the actual working condition data, and T20 base is the first temperature difference of the closest basic working condition data.

[0109] Taking the dimensionless weighted root mean square value of the first difference, the second difference, and the third difference as an example, the calculation formula of the deviation D is:

[0110] D=

[0111] k1, k2, and k3 are coefficients greater than 0, and their sum is 1. P1 is the first pressure of the actual working condition data, P1 base is the first pressure of the closest basic working condition data, T20 is the first temperature difference of the actual working condition data, T20 base is the first temperature difference of the closest basic working condition data, T30 is the second temperature difference of the actual working condition data, and T30 base is the second temperature difference of the closest basic working condition data.

[0112] like Figures 1 to 3 As shown, in some embodiments of the hydraulic control method, the weight of the dimensionless weighted root mean square value is dynamically adjusted according to the operating time of the hydraulic regulation system, and the weight of the first difference value decreases successively.

[0113] By dynamically adjusting the weight of the dimensionless weighted root mean square value according to actual conditions, the deviation calculation method can be adjusted according to the actual working environment of the hydraulic control system, thereby improving the response speed of the hydraulic control system, reducing component damage, and increasing the service life of the hydraulic control system.

[0114] like Figures 1 to 3 As shown, in some embodiments of the hydraulic control method, the oil quantity adjustment step includes: when the deviation is less than a first preset deviation value, maintaining the flow rate of oil delivered by the regulating oil pump 21 to the oil replenishing pipeline 113 unchanged; when the deviation is between the first preset deviation value and a second preset deviation value, adjusting the flow rate of oil delivered by the regulating oil pump 21 to the oil replenishing pipeline 113, wherein the second preset deviation value is greater than the first preset deviation value; when the deviation is greater than the second preset deviation value, adjusting the closed pump 101 so that the closed pump 101 operates at less than 100% load for at least part of the time period.

[0115] By setting multiple deviation intervals and corresponding different oil quantity adjustment strategies, precise hydraulic system oil replenishment control can be achieved. When the deviation is less than the first preset deviation value, the flow rate of oil delivered by the regulating oil pump 21 to the oil replenishment pipeline 113 is maintained unchanged, which helps to avoid system fluctuations caused by frequent adjustments. When the deviation is between the first preset deviation value and the second preset deviation value, by adjusting the flow rate of oil delivered by the regulating oil pump 21 to the oil replenishment pipeline 113, the oil replenishment capacity of the hydraulic control system is improved, and the heat dissipation capacity of the hydraulic control system is enhanced. When the deviation is greater than the second preset deviation value, by adjusting the closed pump 101 so that the closed pump 101 operates at less than 100% load for at least part of the time period, the heat dissipation of the closed pump 101 can be effectively reduced, thereby quickly reducing the temperature of the oil in the hydraulic control system represented by the first oil temperature T1.

[0116] like Figures 1 to 3As shown, in some embodiments of the hydraulic control method, the hydraulic control system includes an alarm device 8; the hydraulic control method includes an alarm step, and the alarm step includes: when the second temperature difference T30 continues to exceed the third preset temperature difference within the second preset time period, and the second pressure P2 is within the preset range, the control device 7 controls the alarm device 8 to alarm; and / or when the third temperature difference T40 continues to exceed the fourth preset temperature difference within the third preset time period, and the second pressure P2 is within the preset range, the control device 7 controls the alarm device 8 to alarm.

[0117] By setting the second temperature difference T30 to continuously exceed the third preset temperature difference within the second preset time period and the second pressure P2 to be within the preset range, the alarm device 8 is controlled to alarm; and / or when the third temperature difference T40 continuously exceeds the fourth preset temperature difference within the third preset time period and the second pressure P2 is within the preset range, the alarm device 8 is controlled to alarm, so that when the hydraulic control system is in an abnormal state, the alarm device is controlled to work, thereby facilitating the operator to discover and deal with the problem in time, preventing emergency situations from damaging components of the hydraulic control system, and facilitating stable operation of the hydraulic control system.

[0118] like Figures 1 to 3 As shown, in the hydraulic control method of some embodiments, when the first temperature difference T20 is greater than the fifth preset temperature difference, the hydraulic control method includes a flushing valve adjustment step, which includes controlling the flushing valve 41 to increase the flow rate of part of the oil in the closed circuit by a third preset proportion.

[0119] When the first temperature difference T20 is greater than the fifth preset temperature difference, the proportion of the flow of part of the oil in the closed circuit is led out by controlling the flushing valve 41, thereby increasing the discharge of high-temperature oil, thereby accelerating the circulation of the oil in the hydraulic control system, effectively reducing the temperature of the oil in the hydraulic control system, and avoiding performance degradation or component damage due to overheating of the oil.

[0120] like Figures 1 to 3 As shown, in some embodiments of the hydraulic control method, the hydraulic control method includes: shutting down for inspection when the first temperature difference T20 continues to exceed a preset temperature difference range within a fourth preset time period.

[0121] By setting a shutdown inspection when the first temperature difference T20 continues to exceed the preset temperature difference range within the fourth preset time period, the hydraulic system can be effectively prevented from continuing to operate under abnormally high temperature conditions, thereby avoiding component damage or system failure caused by overheating, which is beneficial to improving the safety and reliability of the hydraulic control system.

[0122] The following combination Figures 1 to 4 A hydraulic control system according to an embodiment of the present application is described in more detail.

[0123] like Figures 1 to 4 As shown, the hydraulic control system of the embodiment of the present application includes an oil tank 5, a closed hydraulic system 1, a water pump 103 and a flushing system 4, a regulating oil circuit 2 and a heat dissipation system 3.

[0124] like Figure 1 As shown, the closed hydraulic system 1 includes a closed pump 101, a working motor 102, a charge pump 104, a first pipeline 111, a second pipeline 112, and a charge pipeline 113. The first closed pump interface 101A is connected to the first working motor interface 102A via the first pipeline 111, and the second closed pump interface 101B is connected to the second working motor interface 102B via the second pipeline 112 to form a closed circuit. The inlet of the charge pump 104 is connected to the oil tank 5. One end of the charge pipeline 113 is connected to the outlet of the charge pump 104, and the other end is connected to the first pipeline 111 and the second pipeline 112, and is configured to transport oil to the closed circuit.

[0125] The working motor 102 is drivingly connected to the water pump 103 .

[0126] like Figure 1 As shown, the flushing system 4 is connected to the first pipeline 111 and the second pipeline 112 and is configured to drain a portion of the oil in the closed circuit. The flushing system 4 includes a flushing valve 41 and a flushing switching valve 42. The inlet of the flushing valve 41 is connected to the first pipeline 111 and the second pipeline 112 respectively through the flushing switching valve 42. The flushing switching valve 42 is configured to connect one of the first pipeline 111 and the second pipeline 112 to the inlet of the flushing valve 41 while disconnecting the other.

[0127] like Figure 1 As shown, the cooling system 3 is connected to the flushing system 4 and the oil tank 5 and is configured to cool a portion of the oil drawn from the flushing system 4 and transfer the cooled portion of the oil to the oil tank 5. The cooling system 3 includes a radiator 31, a cooling motor 32, and a fan 33. The radiator 31 is connected to the outlet of the flushing valve 41 and the oil tank 5, respectively. The cooling motor 32 is in driving connection with the fan 33, which is configured to accelerate heat dissipation from the radiator 31.

[0128] like Figure 2 As shown, the regulating oil circuit 2 includes a regulating oil pump 21 and a multi-way valve 22. The inlet of the regulating oil pump 21 is connected to the oil tank 5, and the outlet of the regulating oil pump 21 is connected to the oil replenishment line 113, configured to deliver oil to the closed circuit. The regulating oil pump 21 is drivingly connected to the heat dissipation motor 32 of the heat dissipation system 3 and is configured to drive the heat dissipation motor 32. In some embodiments, the regulating oil pump 21 can be a gear pump or a plunger pump.

[0129] like Figure 2As shown, the multi-way valve 22 is connected between the outlet of the regulating oil pump 21 and the oil supply line 113 and the cooling system 3. The multi-way valve 22 controls whether the oil at the outlet of the regulating oil pump 21 flows to the oil supply line 113 and / or the cooling system 3. The multi-way valve 22 includes a supply branch control valve 221, a cooling branch control valve 222, and a cooling motor pressure limiting valve 223. The supply branch control valve 221 is connected between the outlet of the regulating oil pump 21 and the oil supply line 113 and is configured to control whether the oil at the outlet of the regulating oil pump 21 flows to the oil supply line 113 and the flow rate flowing thereto. The cooling branch control valve 222 is connected between the outlet of the regulating oil pump 21 and the inlet of the cooling motor 32 and is configured to control whether the oil at the outlet of the regulating oil pump 21 flows to the cooling motor 32 and the flow rate flowing thereto. The heat dissipation motor pressure limiting valve 223 is connected between the inlet of the heat dissipation motor 32 and the oil tank 5 and is configured to limit the pressure of the heat dissipation motor 32. The oil charge branch control valve 221 and the heat dissipation branch control valve 222 are, for example, five-position, three-way solenoid valves. The heat dissipation motor pressure limiting valve 223 is, for example, a relief valve.

[0130] The hydraulic control system further includes a detection device 6 and a control device 7 .

[0131] The control device adjusts the flow rate of oil delivered by the oil pump 21 to the oil replenishment pipeline 113 and / or the heat dissipation motor 32 through the multi-way valve 22 according to the working parameters.

[0132] like Figure 4 As shown, the detection device 6 includes a first pressure sensor 61, a second pressure sensor 62, a third pressure sensor 63, a first temperature sensor 64, a second temperature sensor 65, a third temperature sensor 66, a fourth temperature sensor 67, and a speed sensor 68. The first pressure sensor 61 is configured to detect a first pressure P1 of the oil at the first closed-loop pump interface 101A. The second pressure sensor 62 is configured to detect a second pressure P2 of the oil in the oil replenishment line 113. The third pressure sensor 63 is configured to detect a third pressure P3 of the water flow at the outlet of the water pump 103. The first temperature sensor 64 is configured to detect a first temperature T1 of the oil in the oil tank 5. The second temperature sensor 65 is configured to detect a second temperature T2 of the oil at the inlet of the cooling system 3. The third temperature sensor 66 is configured to detect a third temperature T3 of the leaked oil from the closed-loop pump 101. The fourth temperature sensor 67 is configured to detect a fourth temperature T4 of the leaked oil from the working motor 102. The speed sensor 68 is configured to detect the speed of the water pump 103.

[0133] The operating parameters may include at least a part of the first pressure P1, the second pressure P2, the third pressure P3, the first temperature T1, the second temperature T2, the third temperature T3, the fourth temperature T4 and the rotational speed of the water pump 103. The operating parameters may also include partial parameters obtained from any one or any combination of the aforementioned parameters, such as the water pump flow and water pump head obtained from the third pressure P3 and the rotational speed of the water pump 103, the first temperature difference T20 between the second temperature T2 and the first temperature T1, the second temperature difference T30 between the third temperature T3 and the first temperature T1, the third temperature difference T40 between the fourth temperature T4 and the first temperature T1, as well as the deviation between the aforementioned actual operating condition data and the closest basic operating condition data, and the first difference, second difference, third difference and fourth difference used when calculating the deviation, etc.

[0134] The control device 7 is coupled with the detection device 6, the closed pump 101, the oil replenishing pump 104, the regulating oil pump 21, the flushing system 4 and the cooling system 3, and is configured to control the operation of the closed pump 101, the oil replenishing pump 104, the regulating oil pump 21, the flushing system 4 and the cooling system 3 according to the working parameters.

[0135] like Figure 4 As shown, the hydraulic control system further includes an alarm device 8 , and the control device 7 is signal-connected to the alarm device 8 and is configured to control the operation of the alarm device 8 according to operating parameters.

[0136] The working process of the hydraulic control system of an embodiment of the present application is described below.

[0137] The closed pump 101 supplies oil to the working motor 102 through the first pipeline 111 or the second pipeline 112. The excess oil in the working motor 102 flows back to the closed pump 101. The closed pump 101, the working motor 102, the first pipeline 111 and the second pipeline 112 form a closed loop. One end of the oil supply pipeline 113 is connected to the oil tank 5, and the other end is connected to the closed loop to transport oil to the closed loop. Part of the oil in the closed loop is led out to the cooling system 3 through the flushing system 4, and flows into the oil tank 5 after being cooled by the radiator 31. The flushing switching valve 42 controls whether the inlet of the flushing valve 41 is connected to the first pipeline 111 or the second pipeline 112. The working motor 102 drives the water pump 103 to work.

[0138] The regulating oil pump 21, controlled by the multi-way valve 22, delivers oil from the oil tank 5 to the closed circuit or drives the cooling motor 32. The oil supply branch control valve 221 controls whether the oil at the outlet of the regulating oil pump 21 flows to the oil supply line 113 and the flow rate therein. The cooling branch control valve 222 controls whether the oil at the outlet of the regulating oil pump 21 flows to the cooling motor 32 and the flow rate therein. The cooling motor pressure limiting valve 223 limits the pressure in the cooling motor 32.

[0139] When the system oil temperature rises, the oil pump 21 is controlled and adjusted to deliver oil to the closed circuit, increasing the oil in the closed circuit, thereby providing sufficient oil for the working motor 102. The closed circuit also has sufficient oil to supply the flushing system 4 to the heat dissipation system 3. Alternatively, the oil pump 21 is controlled and adjusted to drive the heat dissipation motor 32, thereby activating the fan 33 connected to the heat dissipation motor 32, thereby accelerating the heat dissipation of the radiator 31.

[0140] The following combination Figure 3 A hydraulic control method of a hydraulic control system according to an embodiment of the present application is described.

[0141] The hydraulic control method includes an oil quantity adjustment step. The oil quantity adjustment step includes: providing a basic operating condition database, the basic operating condition database including multiple sets of basic operating condition data, the multiple sets of basic operating condition data including operating parameters of the water pump 103 under different operating conditions during normal operation, the operating parameters under different operating conditions during normal operation including water pump flow and water pump head; obtaining actual operating condition data of the water pump 103 during actual operation, the actual operating condition data being the operating parameters during actual operation, the operating parameters during actual operation including water pump flow and water pump head; using a set of basic operating condition data with the water pump flow and water pump head closest to the water pump flow and water pump head in the actual operating condition data as the closest basic operating condition data; and when a deviation between the actual operating condition data and the closest basic operating condition data is outside a preset deviation range, adjusting the flow rate of oil delivered by the adjustment oil pump 21 to the oil replenishment pipeline 113 and / or the cooling system 3 via the multi-way valve 22 to ensure that the deviation is within the preset deviation range.

[0142] The deviation is the dimensionless weighted root mean square (RMS) value of the first difference between the first pressure P1 of the actual operating condition data and the first pressure P1 of the closest baseline operating condition data, the second difference between the first temperature difference T20 of the actual operating condition data and the first temperature difference T20 of the closest baseline operating condition data, the third difference between the second temperature difference T30 of the actual operating condition data and the second temperature difference T30 of the closest baseline operating condition data, and the fourth difference between the third temperature difference T40 of the actual operating condition data and the third temperature difference T40 of the closest baseline operating condition data. The weights of the dimensionless weighted RMS values ​​are dynamically adjusted based on the operating time of the hydraulic control system, with the weight of the first difference decreasing over time. For example, after 8 hours of operation, the weight of the first difference decreases from 70% at startup to 40% after multiple dynamic adjustments.

[0143] The basic operating condition database is updated once after each preset operation time. The multiple groups of basic operating condition data in the updated basic operating condition database include operating parameters of the water pump 103 under different operating conditions when it is operating normally at the update time point.

[0144] In addition to the water pump flow and water pump head, the working parameters of the basic working condition data and the actual working condition data also include the following parameters: the first pressure P1 of the oil at the first closed pump interface 101A; the second pressure P2 of the oil in the oil supply line 113; the first temperature T1 of the oil in the oil tank 5; the second temperature T2 of the oil at the inlet of the cooling system 3; the third temperature T3 of the leakage oil of the closed pump 101; the first temperature difference T20, the first temperature difference T20 is the difference between the second temperature T2 and the first temperature T1; the second temperature difference T30, the second temperature difference T30 is the difference between the third temperature T3 and the first temperature T1; and the third temperature difference T40, the third temperature difference T40 is the difference between the fourth temperature T4 and the first temperature T1, and the fourth temperature T4 is the temperature of the leakage oil of the working motor 102.

[0145] like Figure 3 As shown, when the first temperature T1 is between the first preset temperature value and the second preset temperature value, for example, between 45 degrees (corresponding to the first preset temperature value) and 70 degrees (corresponding to the second preset temperature value), the oil quantity adjustment step is performed; wherein the first preset temperature value is less than the second preset temperature value.

[0146] The oil quantity adjustment step includes: when the deviation is less than a first preset deviation value, for example, when the deviation is less than 5% (corresponding to the first preset deviation value), maintaining the flow rate of oil delivered by the regulating oil pump 21 to the oil supply pipeline 113 unchanged; when the deviation is between the first preset deviation value and a second preset deviation value, for example, when the deviation is between 5% and 15% (corresponding to the second preset deviation value), adjusting the flow rate of oil delivered by the regulating oil pump 21 to the oil supply pipeline 113, wherein the second preset deviation value is greater than the first preset deviation value; when the deviation is greater than the second preset deviation value, for example, when the deviation is greater than 15%, adjusting the closed pump 101 so that the closed pump 101 operates at a load lower than 100% in at least part of the time period, for example, so that the closed pump 101 operates alternately at 80% load and 100% load in time periods.

[0147] When the first temperature T1 is lower than a first preset temperature value, for example, lower than 45 degrees, the hydraulic control method further includes the step of turning off the heat dissipation motor.

[0148] When the first temperature T1 is greater than the second preset temperature value, for example, greater than 70 degrees, the hydraulic control method also includes a closed pump load adjustment step, which includes making the closed pump 101 operate at a load lower than 100% for at least part of the time period, for example, making the closed pump 101 operate alternately at 80% load and 100% load in different time periods.

[0149] After executing the closed pump load adjustment step for the first preset time period, if the first temperature T1 is greater than the third preset temperature value, for example, if the closed pump load adjustment step is executed for 5 minutes (corresponding to the first preset time period) and the first temperature T1 is greater than 90 degrees (corresponding to the third preset temperature value), the machine is stopped for inspection.

[0150] When the second temperature difference T30 is between the first preset temperature difference and the second preset temperature difference, the oil quantity adjustment step includes increasing the flow rate of oil delivered by the regulating oil pump 21 to the oil charge line 113, with the ratio of the increased amount to the flow rate of oil delivered by the charge pump 104 being greater than or equal to the first preset ratio and less than the second preset ratio. For example, when the second temperature difference T30 is between 5 degrees (corresponding to the first preset temperature difference) and 10 degrees (corresponding to the second preset temperature difference), the flow rate of oil delivered by the regulating oil pump 21 to the oil charge line 113 is increased, with the ratio of the increased amount to the flow rate of oil delivered by the charge pump 104 being greater than or equal to 10% (corresponding to the first preset ratio) and less than 20% (corresponding to the second preset ratio). When the second temperature difference T30 is greater than the second preset temperature difference, the oil quantity adjustment step includes increasing the flow rate of oil delivered by the regulating oil pump 21 to the oil charge line 113, with the ratio of the increased amount to the flow rate of oil delivered by the charge pump 104 being greater than or equal to the second preset ratio and less than or equal to 100%. For example, when the second temperature difference T30 is greater than 10 degrees, the flow rate of oil delivered by the regulating oil pump 21 to the oil supply pipeline 113 is increased, and the ratio of the increased amount to the flow rate of oil delivered by the oil supply pump 104 is greater than or equal to 20% and less than or equal to 100%.

[0151] When the first temperature difference T20 is greater than the fifth preset temperature difference, the hydraulic control method includes a flushing valve adjustment step, which includes controlling the flushing valve 41 to increase the flow rate of part of the oil in the closed circuit by a third preset proportion. For example, when the first temperature difference T20 is greater than 15 degrees (corresponding to the fifth preset temperature difference), the flushing valve 41 is controlled to increase the flow rate of part of the oil in the closed circuit by 20% (corresponding to the third preset proportion).

[0152] The hydraulic control method includes: when the first temperature difference T20 continues to exceed the preset temperature difference range within a fourth preset time period, for example, when it is continuously less than 5 degrees or greater than 20 degrees (corresponding to the preset temperature difference range) for more than 5 minutes (corresponding to the fourth preset time period), stopping for inspection.

[0153] The hydraulic control method includes an alarm step, which includes: when the second temperature difference T30 continues to exceed the third preset temperature difference within the second preset time period, for example, the second temperature difference T30 continues to exceed 15 degrees (corresponding to the third preset temperature difference) for 5 consecutive minutes (corresponding to the second preset time period), and the second pressure P2 is within the preset range, the control device 7 controls the alarm device 8 to alarm; and / or when the third temperature difference T40 continues to exceed the fourth preset temperature difference within the third preset time period, for example, the third temperature difference T40 continues to exceed 20 degrees (corresponding to the fourth preset temperature difference) for 8 consecutive minutes (corresponding to the third preset time period), and the second pressure P2 is within the preset range, the control device 7 controls the alarm device 8 to alarm.

[0154] The above preset values ​​or preset ranges, such as the preset temperature value, preset time period, preset temperature difference, preset temperature difference range, preset deviation value, preset ratio, etc., are exemplary and can be adjusted according to the actual needs of the hydraulic control system.

[0155] Those skilled in the art will understand that, in the above-mentioned method of a specific embodiment, the writing order of each step does not mean a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of each step should be determined by its function and possible internal logic.

[0156] The above description of the various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced to each other and will not be repeated herein for the sake of brevity.

[0157] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them. Although the present application has been described in detail with reference to preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present application can still be modified or some technical features can be replaced by equivalents, which should all be included in the scope of the technical solutions requested for protection in this application.

Claims

1. A hydraulic control system, characterized in that: include: Fuel tank (5); A closed hydraulic system (1) comprises a closed pump (101), a working motor (102), an oil replenishing pump (104), a first pipeline (111), a second pipeline (112) and an oil replenishing pipeline (113), wherein the closed pump (101) and the working motor (102) are connected via the first pipeline (111) and the second pipeline (112) to form a closed circuit, an inlet of the oil replenishing pump (104) is connected to the oil tank (5), one end of the oil replenishing pipeline (113) is connected to the outlet of the oil replenishing pump (104), and the other end is connected to at least one of the first pipeline (111) and the second pipeline (112), and is configured to transport oil to the closed circuit; A water pump (103), wherein the working motor (102) is drivingly connected to the water pump (103); a flushing system (4), connected to at least one of the first pipeline (111) and the second pipeline (112), and configured to draw out a portion of the oil in the closed circuit; a regulating oil circuit (2), comprising a regulating oil pump (21), wherein the inlet of the regulating oil pump (21) is connected to the oil tank (5), and the outlet of the regulating oil pump (21) is connected to the oil replenishment pipeline (113), and is configured to deliver oil to the closed circuit; and A heat dissipation system (3) is connected to the flushing system (4) and the oil tank (5), and is configured to cool the portion of oil drawn from the flushing system (4) and transport the cooled portion of oil to the oil tank (5). The heat dissipation system (3) includes a heat dissipation motor (32), and the heat dissipation motor (32) is configured to drive or accelerate the operation of the heat dissipation system (3). The regulating oil pump (21) is configured to transport oil to the heat dissipation motor (32); The regulating oil circuit (2) further comprises a multi-way valve (22), wherein the multi-way valve (22) is connected between the outlet of the regulating oil pump (21) and the oil replenishing pipeline (113) and the heat dissipation motor (32), and the multi-way valve (22) controls whether the oil at the outlet of the regulating oil pump (21) flows to the oil replenishing pipeline (113) and the heat dissipation motor (32).

2. The hydraulic control system according to claim 1, characterized in that: The flushing system (4) comprises a flushing valve (41) and a flushing switching valve (42), wherein the inlet of the flushing valve (41) is connected to the first pipeline (111) and the second pipeline (112) respectively through the flushing switching valve (42), and the flushing switching valve (42) is configured to connect one of the first pipeline (111) and the second pipeline (112) to the inlet of the flushing valve (41) while disconnecting the other; and / or The heat dissipation system (3) further comprises a radiator (31) and a fan (33), wherein the radiator (31) is connected to the outlet of the flushing valve (41) and the oil tank (5) respectively, and the heat dissipation motor (32) is drivingly connected to the fan (33), and the fan (33) is configured to accelerate the heat dissipation of the radiator (31).

3. The hydraulic control system according to claim 1, characterized in that: The multi-way valve (22) comprises: an oil replenishment branch control valve (221), connected between the outlet of the regulating oil pump (21) and the oil replenishment pipeline (113), and configured to control whether the oil at the outlet of the regulating oil pump (21) flows to the oil replenishment pipeline (113); and The heat dissipation branch control valve (222) is connected between the outlet of the regulating oil pump (21) and the inlet of the heat dissipation motor (32), and is configured to control whether the oil at the outlet of the regulating oil pump (21) flows to the heat dissipation motor (32).

4. The hydraulic control system according to claim 3, characterized in that: The multi-way valve (22) includes a heat dissipation motor pressure limiting valve (223), which is connected between the inlet of the heat dissipation motor (32) and the oil tank (5) and is configured to limit the pressure of the heat dissipation motor (32).

5. The hydraulic control system according to any one of claims 1 to 4, characterized in that: The hydraulic control system further comprises: A detection device (6) configured to detect operating parameters of the hydraulic control system; and A control device (7) is coupled to at least one of the detection device (6), the closed pump (101), the oil replenishing pump (104), the regulating oil pump (21), the flushing valve (41) of the flushing system (4), and the heat dissipation motor (32), and is configured to control the operation of at least one of the closed pump (101), the oil replenishing pump (104), the regulating oil pump (21), the flushing system (4), and the heat dissipation motor (32) according to the operating parameters.

6. The hydraulic control system according to claim 5, characterized in that: The control device (7) is configured to adjust the flow rate of oil delivered by the regulating oil pump (21) to the oil replenishment pipeline (113) and the heat dissipation motor (32) through the multi-way valve (22) according to the working parameters.

7. The hydraulic control system according to claim 5, characterized in that: The detection device (6) comprises: a first pressure sensor (61) configured to detect a first pressure P1 of oil at an outlet of the closed pump (101), the operating parameter including the first pressure P1; and / or a second pressure sensor (62) configured to detect a second pressure P2 of the oil in the oil replenishment line (113), the operating parameter including the second pressure P2; and / or a third pressure sensor (63) configured to detect a third pressure P3 of the water flow at the outlet of the water pump (103), the operating parameter including the third pressure P3; and / or a first temperature sensor (64) configured to detect a first temperature T1 of the oil in the oil tank (5), the operating parameter including the first temperature T1; and / or a second temperature sensor (65) configured to detect a second temperature T2 of the oil at the inlet of the heat dissipation system (3), the operating parameter including the second temperature T2; and / or a third temperature sensor (66) configured to detect a third temperature T3 of leaked oil from the closed pump (101), the operating parameter including the third temperature T3; and / or a fourth temperature sensor (67) configured to detect a fourth temperature T4 of leaked oil of the working motor (102), the working parameter including the fourth temperature T4; and / or The rotation speed sensor (68) is configured to detect the rotation speed of the water pump (103), and the operating parameter includes the rotation speed.

8. The hydraulic control system according to claim 5, characterized in that: The hydraulic control system further comprises an alarm device (8), and the control device (7) is connected to the alarm device (8) via a signal and is configured to control the operation of the alarm device (8) according to the operating parameters.

9. A drainage vehicle, characterized in that: The drainage vehicle includes the hydraulic control system according to any one of claims 1 to 8.

10. A hydraulic control method based on the hydraulic control system according to any one of claims 1 to 8, characterized in that: include: The regulating oil pump (21) delivers oil to the oil replenishment pipeline (113); and / or The flushing system (4) draws out a portion of the oil in the closed circuit, and the heat dissipation system (3) cools the portion of the oil drawn out by the flushing system (4) and transports the cooled portion of the oil to the oil tank (5).

11. The hydraulic control method according to claim 10, characterized in that: The heat dissipation system (3) includes a heat dissipation motor (32), and the regulating oil pump (21) is drivingly connected to the heat dissipation motor (32); The cooling system (3) cools the portion of oil drawn out of the flushing system (4) by driving the cooling motor (32) through the regulating oil pump (21) to drive or accelerate the operation of the cooling system (3).

12. The hydraulic control method according to claim 11, characterized in that: The regulating oil circuit (2) further comprises a multi-way valve (22), wherein the multi-way valve (22) is connected between the outlet of the regulating oil pump (21), the oil supply pipeline (113), and the heat dissipation system (3); The hydraulic control method includes controlling, by means of the multi-way valve (22), whether the oil at the outlet of the regulating oil pump (21) flows to the oil replenishment pipeline (113) and the heat dissipation motor (32).

13. The hydraulic control method according to claim 12, characterized in that: At least one of the closed pump (101), the oil replenishment pump (104), the regulating oil pump (21), the flushing system (4) and the heat dissipation motor (32) is controlled to operate according to operating parameters of the hydraulic control system.

14. The hydraulic control method according to claim 13, characterized in that: The hydraulic control method includes an oil quantity adjustment step, wherein the oil quantity adjustment step includes adjusting the flow rate of oil delivered by the regulating oil pump (21) to the oil replenishment pipeline (113) and the heat dissipation motor (32) through the multi-way valve (22) according to the working parameters.

15. The hydraulic control method according to claim 14, characterized in that: The oil quantity adjustment step includes: Providing a basic operating condition database, the basic operating condition database including multiple sets of basic operating condition data, the multiple sets of basic operating condition data including the operating parameters of the water pump (103) under different operating conditions during normal operation, the operating parameters under different operating conditions during normal operation including the water pump flow rate and the water pump head; Acquiring actual working condition data of the water pump (103) during actual operation, wherein the actual working condition data is the working parameters during actual operation, and the working parameters during actual operation include the water pump flow rate and the water pump head; A set of basic operating condition data in which the water pump flow rate and the water pump head in the plurality of sets of basic operating condition data are closest to the water pump flow rate and the water pump head in the actual operating condition data is taken as the closest basic operating condition data. When a deviation between the actual operating condition data and the closest basic operating condition data is outside a preset deviation range, the flow rate of the regulating oil pump (21) delivering oil to the oil replenishment pipeline (113) and / or the cooling system (3) is adjusted by the multi-way valve (22) so that the deviation is within the preset deviation range.

16. The hydraulic control method according to claim 15, characterized in that: After each preset operation time, the basic operating condition database is updated once, and the multiple groups of basic operating condition data in the updated basic operating condition database include the operating parameters of the water pump (103) under different operating conditions when it is operating normally at the update time point.

17. The hydraulic control method according to claim 15, characterized in that: The operating parameters of the basic operating condition data and the actual operating condition data further include at least one of the following parameters: a first pressure P1 of the oil at the outlet of the closed pump (101); a second pressure P2 of the oil in the oil replenishment pipeline (113); a first temperature T1 of the oil in the oil tank (5); a second temperature T2 of the oil at the inlet of the heat dissipation system (3); a third temperature T3 of the leaked oil of the closed pump (101); a first temperature difference T20, wherein the first temperature difference T20 is a difference between the second temperature T2 and the first temperature T1; a second temperature difference T30, where the second temperature difference T30 is a difference between the third temperature T3 and the first temperature T1; and A third temperature difference T40, wherein the third temperature difference T40 is a difference between a fourth temperature T4 and the first temperature T1, and the fourth temperature T4 is a temperature of leaked oil of the working motor (102).

18. The hydraulic control method according to claim 17, characterized in that: When the first temperature T1 increases, the oil quantity adjustment step includes: Increasing the flow rate of oil delivered by the regulating oil pump (21) to the oil supply pipeline (113) through the multi-way valve (22); and / or The multi-way valve (22) increases the flow rate of oil delivered by the regulating oil pump (21) to the heat dissipation motor (32).

19. The hydraulic control method according to claim 17, characterized in that: When the first temperature T1 is between a first preset temperature value and a second preset temperature value, the oil quantity adjustment step is performed; wherein the first preset temperature value is less than the second preset temperature value.

20. The hydraulic control method according to claim 19, characterized in that: When the first temperature T1 is lower than a first preset temperature value, the hydraulic control method further comprises the step of shutting down the heat dissipation motor; and / or When the first temperature T1 is greater than a second preset temperature value, the hydraulic control method further comprises a closed pump load adjustment step, wherein the closed pump load adjustment step comprises causing the closed pump (101) to operate at a load lower than 100% for at least a portion of the time period.

21. The hydraulic control method according to claim 20, characterized in that: After the first preset time period of the closed pump load adjustment step, if the first temperature T1 is greater than a third preset temperature value, the machine is stopped for inspection, and the third preset temperature value is greater than the second preset temperature value.

22. The hydraulic control method according to claim 17, characterized in that: When the second temperature difference T30 is between the first preset temperature difference and the second preset temperature difference, the oil quantity regulating step includes increasing the flow rate of the oil delivered by the regulating oil pump (21) to the oil supply pipeline (113), and the ratio of the increased amount to the flow rate of the oil delivered by the oil supply pump (104) is greater than or equal to the first preset ratio and less than the second preset ratio; When the second temperature difference T30 is greater than the second preset temperature difference, the oil quantity regulating step includes increasing the flow rate of oil delivered by the regulating oil pump (21) to the oil supply pipeline (113), and the ratio of the increased amount to the flow rate of oil delivered by the oil supply pump (104) is greater than or equal to the second preset ratio and less than or equal to 100%.

23. The hydraulic control method according to claim 17, characterized in that: The deviation is a function of at least one of a first difference between the first pressure P1 of the actual operating condition data and the first pressure P1 of the closest basic operating condition data, a second difference between the first temperature difference T20 of the actual operating condition data and the first temperature difference T20 of the closest basic operating condition data, a third difference between the second temperature difference T30 of the actual operating condition data and the second temperature difference T30 of the closest basic operating condition data, and a fourth difference between the third temperature difference T40 of the actual operating condition data and the third temperature difference T40 of the closest basic operating condition data.

24. The hydraulic control method according to claim 23, characterized in that: The deviation is a dimensionless weighted root mean square value of at least two of the first difference, the second difference, the third difference, and the fourth difference.

25. The hydraulic control method according to claim 24, characterized in that: The weight of the dimensionless weighted root mean square value is dynamically adjusted according to the operating time of the hydraulic regulation system, and the weight of the first difference is gradually reduced.

26. The hydraulic control method according to claim 23, characterized in that: in, The oil quantity adjustment step includes: When the deviation is less than a first preset deviation value, the flow rate of oil delivered by the regulating oil pump (21) to the oil supply pipeline (113) is maintained unchanged; When the deviation is between the first preset deviation value and a second preset deviation value, regulating the flow rate of oil delivered by the regulating oil pump (21) to the oil replenishment pipeline (113), wherein the second preset deviation value is greater than the first preset deviation value; When the deviation is greater than the second preset deviation value, the closed pump (101) is adjusted so that the closed pump (101) operates at a load lower than 100% during at least a portion of the time period.

27. The hydraulic control method according to claim 17, characterized in that: The hydraulic control system includes an alarm device (8); The hydraulic control method includes an alarm step, which includes: The second temperature difference T30 continuously exceeds the third preset temperature difference within the second preset time period, and the second pressure P2 is within the preset range, controlling the alarm device (8) to sound an alarm; and / or When the third temperature difference T40 continues to exceed the fourth preset temperature difference within the third preset time period, and the second pressure P2 is within the preset range, the alarm device (8) is controlled to sound an alarm.

28. The hydraulic control method according to claim 17, wherein: When the first temperature difference T20 is greater than a fifth preset temperature difference, the hydraulic control method includes a flushing valve adjustment step, wherein the flushing valve adjustment step includes controlling the flushing valve (41) to increase the flow rate of part of the oil in the closed circuit by a third preset ratio.

29. The hydraulic control method according to claim 17, wherein: The hydraulic control method includes: stopping the machine for inspection when the first temperature difference T20 continues to exceed a preset temperature difference range within a fourth preset time period.

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