A method and system for automatic control of pressure of a governor oil pressure device

Abstract

The present disclosure belongs to the technical field of pressure control of governor oil pressure device, and specifically provides a governor oil pressure device pressure automatic control method and system. The method comprises the following steps: after the maintenance of the oil pressure device is completed, a valve pump assembly is controlled to add oil to the hydraulic pipeline to obtain the oil amount of the hydraulic pipeline; the pressure building target value is updated, the total oil amount is calculated, and the valve pump assembly is controlled based on the measured oil level of the oil return tank, the measured oil level of the pressure oil tank, the total oil amount, the oil level limit value of the oil return tank, the upper limit of the oil level of the pressure oil tank, and the total oil amount limit value to supplement oil to the oil return tank and the pressure oil tank until the measured oil level of the pressure oil tank reaches the pressure building air supplement level, and then the on-off of the oil tank air supplement valve is controlled in combination with the pressure threshold value of the medium-pressure gas system to supplement air to the pressure oil tank. The pressure building target value is continuously updated to the rated oil pressure during the air supplement process, and if the measured value of the pressure of the pressure oil tank reaches the rated oil pressure, the automatic pressure building is completed. By using the method of the present disclosure, the reliability and efficiency of the pressure tank air supplement pressure building are improved.

Description

Technical Field

[0001] This disclosure belongs to the field of pressure control technology for governor hydraulic devices, and particularly relates to an automatic pressure control method and system for governor hydraulic devices. Background Technology

[0002] The hydraulic governor's hydraulic system is the main equipment providing power to the turbine governor's guide vane relay. It consists of components such as a motor oil pump, pressure tank, return oil tank, safety valve, automatic air replenishment device, automatic oil replenishment device, magnetic level gauge, and pressure sensor. During normal operation, the hydraulic governor's hydraulic system maintains pressure by replenishing oil into the tank when the pressure drops to the pump start-up pressure and by replenishing air into the tank when the oil level exceeds the air replenishment level. However, this method is not suitable for restoring tank pressure after maintenance. When the pressure in the tank is too low, the automatic air replenishment valve and conventional automatic control of the oil pump can easily cause the intermediate-pressure air system to collapse or the oil level in the tank to become too high. After maintenance, manual air replenishment and pressure building are required to restore the normal pressure of the hydraulic system.

[0003] Currently, after maintenance of the turbine governor's hydraulic system, the system pressure is restored manually by adding oil. Operators manually control the oil supply valve, determining the amount of oil added based on experience, which frequently results in overfilling or underfilling. During air replenishment for pressure building, operators must constantly monitor the pressure rise in the pressure tank and the pressure drop in the intermediate-pressure air system, controlling the air supply valve opening based on experience to prevent excessively high pressure in the pressure tank or excessively low pressure in the intermediate-pressure air system. This leads to a waste of human resources and time. Therefore, it is necessary to improve the existing technology. Summary of the Invention

[0004] This disclosure aims to at least partially address one of the technical problems in the related art. To this end, this disclosure provides an automatic pressure control method and system for a governor hydraulic device, primarily aimed at improving the reliability and efficiency of pressure tank pressurization.

[0005] According to a first aspect of this disclosure, an automatic pressure control method for a governor hydraulic device is provided. The governor hydraulic device includes a return oil tank, a pressure oil tank, a valve-pump assembly, and hydraulic lines. The valve-pump assembly includes a return oil tank supply valve, an oil pump, an oil tank supply valve, and an oil tank air supply valve. The return oil tank is connected to the clean oil tank of a turbine oil system via the return oil tank supply valve. The return oil tank is connected to the pressure oil tank via the oil pump. The pressure oil tank is connected to the hydraulic lines via the oil tank supply valve. The pressure oil tank is connected to a medium-pressure air system via the oil tank air supply valve. A first oil level measuring unit is arranged on the return oil tank, and a second oil level measuring unit and a pressure sensor are arranged on the pressure oil tank. The automatic pressure control method includes:

[0006] After the governor hydraulic device is overhauled, set the pressure target value, pressure build-up oil level, rated oil pressure, and medium-pressure air system pressure threshold. When the command to enter the pressure build-up condition is received, obtain the return oil tank level limit, pressure tank level limit, and total oil consumption limit. Also obtain the measured return oil tank level from the first oil level measurement unit, the measured pressure tank level from the second oil level measurement unit, and the measured pressure tank pressure from the pressure sensor.

[0007] Based on the oil level limit of the return oil tank, the target value of the pressure build-up pressure, the oil level of the pressure build-up replenishment gas, the measured oil level of the return oil tank, the measured oil level of the pressure oil tank, and the measured pressure value of the pressure oil tank, the working state of the valve pump assembly is controlled to add oil to the hydraulic pipeline, and the amount of oil used in the hydraulic pipeline is obtained after the oil is added to the hydraulic pipeline.

[0008] The target pressure value for pressure build-up is updated. The total oil consumption is calculated based on the measured oil level in the return oil tank, the measured oil level in the pressure oil tank, and the oil consumption in the hydraulic pipeline. The working state of the valve pump assembly is controlled based on the measured oil level in the return oil tank, the measured oil level in the pressure oil tank, the total oil consumption, the oil level limit in the return oil tank, the upper limit of the oil level in the pressure oil tank, and the total oil consumption limit, so as to replenish oil to the return oil tank and the pressure oil tank until the measured oil level in the pressure oil tank reaches the pressure build-up replenishment oil level.

[0009] When the measured oil level in the pressure tank reaches the pressure build-up air replenishment level, the air replenishment valve of the oil tank is opened to replenish air to the pressure tank. If the measured pressure of the medium-pressure air system is lower than the medium-pressure air system pressure threshold during the air replenishment process, the air replenishment valve of the oil tank is closed and the medium-pressure air system is filled with air using an air compressor until the measured pressure of the medium-pressure air system is higher than the medium-pressure air system pressure threshold. Then the air replenishment valve of the oil tank is opened again. If the measured pressure of the pressure tank reaches the updated pressure build-up target value during the air replenishment process, the pressure build-up target value is updated again and air replenishment continues until the updated pressure build-up target value is the rated oil pressure. If the measured pressure of the pressure tank reaches the rated oil pressure, the automatic pressure build-up is completed.

[0010] In one embodiment of this disclosure, the return oil tank level limit includes an upper limit and a lower limit. The step of controlling the operating state of the valve-pump assembly to add oil to the hydraulic pipeline based on the return oil tank level limit, the target pressure value, the pressure-building replenishment oil level, the measured oil level in the return oil tank, the measured oil level in the pressure tank, and the measured pressure value in the pressure tank includes: if the measured oil level in the return oil tank does not exceed the lower limit, controlling the return oil tank supply valve to open and the oil pump to stop working; if the measured oil level in the return oil tank reaches the lower limit, controlling the return oil tank supply valve to open and the oil pump to stop working; if the measured oil level in the return oil tank reaches the lower limit, controlling the return oil tank supply valve to open and the oil pump to stop working. When the oil level reaches the upper limit, the oil supply valve of the return oil tank is closed and the oil pump is activated. When the measured oil level in the pressure tank reaches the pressure build-up air replenishment oil level, the comparison between the measured oil level in the return oil tank and the oil level limit in the return oil tank is stopped, and the oil supply valve of the return oil tank is closed and the oil pump stops working. When the measured oil level in the pressure tank reaches the pressure build-up air replenishment oil level, the air replenishment valve of the oil tank is opened to replenish air to the pressure tank until the measured pressure value of the pressure tank reaches the pressure build-up target value. Then, the air replenishment valve of the oil tank is closed, and the oil supply valve of the oil tank is opened to add oil to the hydraulic pipeline.

[0011] In one embodiment of this disclosure, the step of calculating the total oil consumption based on the measured oil level of the return oil tank, the measured oil level of the pressure oil tank, and the oil consumption of the hydraulic pipeline includes: calculating the oil volume in the return oil tank based on the measured oil level of the return oil tank; calculating the oil volume in the pressure oil tank based on the measured oil level of the pressure oil tank; and calculating the total oil consumption based on the oil volume in the return oil tank, the oil volume in the pressure oil tank, and the oil consumption of the hydraulic pipeline.

[0012] In one embodiment of this disclosure, controlling the operating state of the valve-pump assembly based on the measured oil level in the return oil tank, the measured oil level in the pressure oil tank, the total oil consumption, the oil level limit in the return oil tank, the upper limit of the oil level in the pressure oil tank, and the total oil consumption limit to replenish oil to the return oil tank and the pressure oil tank until the measured oil level in the pressure oil tank reaches the pressure-building gas replenishment oil level includes: determining the return oil tank replenishment demand based on the measured oil level in the return oil tank, the measured oil level in the pressure oil tank, the total oil consumption, the oil level limit in the return oil tank, the upper limit of the oil level in the pressure oil tank, and the total oil consumption limit; if replenishment is needed, controlling the return oil tank supply valve to open and the oil pump to stop working; if replenishment is not needed, controlling the return oil tank supply valve to close and the oil pump to work to replenish oil to the pressure oil tank; when the measured oil level in the pressure oil tank reaches the pressure-building gas replenishment oil level, stopping the return oil tank replenishment demand determination, and controlling the return oil tank supply valve to close and the oil pump to stop working.

[0013] In one embodiment of this disclosure, the total oil consumption limit includes an upper limit and a lower limit, the measured oil level in the return tank includes a first analog level signal and a first digital level signal, and the measured oil level in the pressure tank includes a second analog level signal and a second digital level signal. The step of determining the return tank replenishment demand based on the measured oil level in the return tank, the measured oil level in the pressure tank, the total oil consumption, the return tank oil level limit, the pressure tank oil level upper limit, and the total oil consumption limit includes: when the first analog level signal does not exceed the return tank... When the analog value of the lower limit of the oil level and the switch value of the first liquid level signal do not exceed the switch value of the lower limit of the return oil tank level, or when the total oil consumption is lower than the lower limit of the total oil consumption, the return oil tank needs to be replenished; if at least one of the following conditions is met, the return oil tank does not need to be replenished.

[0014] According to a second aspect of this disclosure, an automatic pressure control system for a governor hydraulic device is also provided. The governor hydraulic device includes a return oil tank, a pressure oil tank, a valve-pump assembly, and hydraulic lines. The valve-pump assembly includes a return oil tank supply valve, an oil pump, an oil tank supply valve, and an oil tank air supply valve. The return oil tank is connected to the clean oil tank of a turbine oil system via the return oil tank supply valve. The return oil tank is connected to the pressure oil tank via the oil pump. The pressure oil tank is connected to the hydraulic lines via the oil tank supply valve. The pressure oil tank is connected to a medium-pressure air system via the oil tank air supply valve. The automatic pressure control system includes:

[0015] The acquisition module includes a first oil level measuring unit arranged on the return oil tank, a second oil level measuring unit arranged on the pressure oil tank, and a pressure sensor. The first oil level measuring unit is used to obtain the measured oil level in the return oil tank, the second oil level measuring unit is used to obtain the measured oil level in the pressure oil tank, and the pressure sensor is used to obtain the measured pressure value in the pressure oil tank. The acquisition module is also used to set the pressure build-up target value, pressure build-up replenishment oil level, rated oil pressure, and medium-pressure air system pressure threshold after the governor oil pressure device has been overhauled.

[0016] The first control module is used to obtain the return oil tank level limit, the pressure tank level limit, and the total oil consumption limit when it receives a command to enter the pressure building condition. Based on the return oil tank level limit, the pressure building target value, the pressure building air supply level, the measured return oil tank level, the measured pressure tank level, and the measured pressure tank pressure, the module controls the working state of the valve pump assembly to add oil to the hydraulic pipeline.

[0017] The calculation module is used to obtain the amount of oil used in the hydraulic pipeline after the oil filling is completed.

[0018] The second control module is used to update the target pressure value for pressure buildup, calculate the total oil consumption based on the measured oil level in the return oil tank, the measured oil level in the pressure oil tank, and the oil consumption in the hydraulic pipeline, and control the working state of the valve-pump assembly based on the measured oil level in the return oil tank, the measured oil level in the pressure oil tank, the total oil consumption, the oil level limit in the return oil tank, the upper limit of the oil level in the pressure oil tank, and the total oil consumption limit, so as to replenish oil to the return oil tank and the pressure oil tank until the measured oil level in the pressure oil tank reaches the pressure buildup air replenishment oil level; when the measured oil level in the pressure oil tank reaches the pressure buildup air replenishment oil level, control the oil tank air replenishment valve to open. The system replenishes air to the pressure tank. If the measured pressure of the medium-pressure air system is lower than the medium-pressure air system pressure threshold during the replenishment process, the air replenishment valve of the oil tank is closed, and the air compressor is used to fill the medium-pressure air system until the measured pressure of the medium-pressure air system is higher than the medium-pressure air system pressure threshold. Then, the air replenishment valve of the oil tank is opened. If the measured pressure of the pressure tank reaches the updated pressure build-up target value during the replenishment process, the pressure build-up target value is updated again, and air replenishment continues until the updated pressure build-up target value is the rated oil pressure. If the measured pressure of the pressure tank reaches the rated oil pressure, the automatic pressure build-up is completed.

[0019] In one embodiment of this disclosure, the return oil tank level limit includes an upper limit and a lower limit. The first control module is specifically configured to: if the measured oil level in the return oil tank does not exceed the lower limit, control the return oil tank supply valve to open and the oil pump to stop working; if the measured oil level in the return oil tank reaches the upper limit, control the return oil tank supply valve to close and the oil pump to work; when the measured oil level in the pressure tank reaches the pressure build-up air replenishment level, stop comparing the measured oil level in the return oil tank with the return oil tank level limit, and control the return oil tank supply valve to close and the oil pump to stop working; when the measured oil level in the pressure tank reaches the pressure build-up air replenishment level, control the oil tank air replenishment valve to open to replenish air to the pressure tank until the measured pressure value of the pressure tank reaches the pressure build-up target value, then control the oil tank air replenishment valve to close and control the oil tank supply valve to open to add oil to the hydraulic pipeline.

[0020] In one embodiment of this disclosure, the second control module is specifically used to: determine the oil replenishment demand of the return oil tank based on the measured oil level of the return oil tank, the measured oil level of the pressure oil tank, the total oil consumption, the oil level limit of the return oil tank, the upper limit of the oil level of the pressure oil tank, and the total oil consumption limit; if oil replenishment is required, control the oil supply valve of the return oil tank to open and the oil pump to stop working; if oil replenishment is not required, control the oil supply valve of the return oil tank to close and the oil pump to work to replenish the pressure oil tank; when the measured oil level of the pressure oil tank reaches the pressure build-up and gas replenishment oil level, stop the oil replenishment demand determination of the return oil tank and control the oil supply valve of the return oil tank to close and the oil pump to stop working.

[0021] In one embodiment of this disclosure, the total oil consumption limit includes an upper limit and a lower limit, the measured oil level in the return tank includes a first analog level signal and a first digital level signal, and the measured oil level in the pressure tank includes a second analog level signal and a second digital level signal. The second control module is specifically used to: replenish oil in the return tank when the first analog level signal does not exceed the analog level of the lower limit of the return tank oil level and the first digital level signal does not exceed the digital level of the lower limit of the return tank oil level, or when the total oil consumption is lower than the lower limit of the total oil consumption; if at least one of the following conditions is met: the first analog level signal reaches the analog level of the upper limit of the return tank oil level, the first digital level signal reaches the digital level of the upper limit of the return tank oil level, the total oil consumption reaches the upper limit of the total oil consumption, the second analog level signal reaches the analog level of the upper limit of the pressure tank oil level, or the second digital level signal reaches the digital level of the upper limit of the pressure tank oil level, the return tank does not need to be replenished.

[0022] According to a third aspect of this disclosure, an automatic pressure control device for a governor hydraulic device is also provided, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the automatic pressure control method for a governor hydraulic device proposed in the first aspect of this disclosure.

[0023] In one or more embodiments of this disclosure, the governor hydraulic device includes a return oil tank, a pressure oil tank, a valve pump assembly, and hydraulic lines. The valve pump assembly includes a return oil tank supply valve, an oil pump, an oil tank supply valve, and an oil tank air supply valve. The return oil tank is connected to the clean oil tank of the turbine oil system via the return oil tank supply valve. The return oil tank is connected to the pressure oil tank via the oil pump. The pressure oil tank is connected to the hydraulic lines via the oil tank supply valve. The pressure oil tank is connected to the medium-pressure air system via the oil tank air supply valve. A first oil level measuring unit is arranged on the return oil tank, and a second oil level measuring unit and a pressure sensor are arranged on the pressure oil tank. The automatic pressure control method includes: in the governor... After the speed reducer hydraulic device is overhauled, the target pressure for pressure buildup, the pressure buildup replenishment oil level, the rated oil pressure, and the intermediate pressure air system pressure threshold are set. When a command to enter pressure buildup mode is received, the oil level limit of the return oil tank, the upper limit of the pressure oil tank level, and the total oil consumption limit are obtained. Additionally, the measured oil level of the return oil tank from the first oil level measurement unit, the measured oil level of the pressure oil tank from the second oil level measurement unit, and the measured pressure value of the pressure oil tank from the pressure sensor are obtained. Based on the oil level limit of the return oil tank, the target pressure for pressure buildup, the pressure buildup replenishment oil level, the measured oil level of the return oil tank, the measured oil level of the pressure oil tank, and the measured pressure value of the pressure oil tank... The system controls the operation of the valve and pump assembly to replenish hydraulic lines and, after replenishment, obtains the hydraulic line oil consumption. It updates the target pressure build-up value and calculates the total oil consumption based on the measured oil level in the return tank, the measured oil level in the pressure tank, and the hydraulic line oil consumption. It then controls the valve and pump assembly's operation based on these values ​​to replenish oil to the return tank and pressure tank until the measured oil level in the pressure tank reaches the pressure build-up replenishment level. When the measured oil level in the pressure tank reaches the pressure build-up replenishment level, the system controls... The oil tank air supply valve opens to supply air to the pressure oil tank. During the air supply process, if the measured pressure of the medium-pressure air system is lower than the medium-pressure air system pressure threshold, the oil tank air supply valve is closed and the air compressor is used to charge the medium-pressure air system until the measured pressure of the medium-pressure air system is higher than the medium-pressure air system pressure threshold. Then the oil tank air supply valve is opened again. During the air supply process, if the measured pressure of the pressure oil tank reaches the updated pressure build-up target value, the pressure build-up target value is updated again and air supply continues until the updated pressure build-up target value is the rated oil pressure. If the measured pressure of the pressure oil tank reaches the rated oil pressure, the automatic pressure build-up is completed.In this scenario, automatic pressure building is achieved by comprehensively considering the target pressure building value, the pressure building replenishment oil level, the rated oil pressure, the medium-pressure air system pressure threshold, the return oil tank level limit, the pressure oil tank level upper limit, the total oil consumption limit, the measured return oil tank level, the measured pressure oil tank level, the measured pressure of the pressure oil tank, and the oil consumption in the hydraulic pipeline. This frees up manpower and improves the efficiency of pressure tank replenishment and pressure building. Furthermore, during the pressure building process, the total oil consumption is calculated based on the measured return oil tank level, the measured pressure oil tank level, and the oil consumption in the hydraulic pipeline. This method combines the measured oil level in the return oil tank, the measured oil level in the pressure tank, and the operating status of the total oil consumption control valve pump assembly to replenish oil to the return oil tank and the pressure tank. Compared to existing methods that only determine whether to replenish oil to the return oil tank based on the measured oil level, this method reduces the possibility of misjudging the replenishment demand. In addition, it combines the pressure threshold of the medium-pressure gas system and the target pressure value for pressure buildup to replenish the pressure tank, avoiding the phenomenon of excessively low pressure in the medium-pressure gas system during replenishment, thereby improving the reliability of pressure tank replenishment and pressure buildup.

[0024] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0025] The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:

[0026] Figure 1 This diagram illustrates a flow chart of an automatic pressure control method for a governor hydraulic device according to an embodiment of the present disclosure.

[0027] Figure 2 A schematic flowchart illustrating the hydraulic pipeline refueling process provided in an embodiment of this disclosure is shown.

[0028] Figure 3 A block diagram of the automatic pressure control system for the governor hydraulic device provided in an embodiment of this disclosure is shown.

[0029] Figure 4 This is a block diagram of an automatic pressure control device for a governor hydraulic device used to implement the automatic pressure control method for the governor hydraulic device in the embodiments of this disclosure. Detailed Implementation

[0030] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with those of this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the embodiments of this disclosure as detailed in the appended claims.

[0031] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined. It should also be understood that the term "and / or" as used in this disclosure refers to and includes any or all possible combinations of one or more associated listed items.

[0033] Embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this disclosure, and should not be construed as limiting this disclosure.

[0034] This disclosure provides an automatic pressure control method and system for a governor hydraulic device, the main purpose of which is to improve the reliability and efficiency of pressure tank pressurization and air replenishment.

[0035] In this disclosure, the governor hydraulic device includes a return oil tank, a pressure oil tank, a valve-pump assembly, and hydraulic lines. The valve-pump assembly includes a return oil tank supply valve, an oil pump, an oil tank supply valve, and an oil tank air supply valve. The return oil tank is connected to the clean oil tank of the turbine oil system via the return oil tank supply valve. When the return oil tank supply valve is open, turbine oil from the clean oil tank of the turbine oil system enters the return oil tank. The return oil tank is connected to the pressure oil tank via the oil pump. When the oil pump operates, it delivers turbine oil from the return oil tank to the pressure oil tank. The pressure oil tank is connected to the hydraulic lines via the oil tank supply valve. When the oil tank supply valve is open, turbine oil from the pressure oil tank enters the hydraulic lines. The pressure oil tank is connected to the intermediate-pressure air system via the oil tank air supply valve. When the oil tank air supply valve is open, gas from the intermediate-pressure air system enters the pressure oil tank.

[0036] In the first embodiment, Figure 1This diagram illustrates a flow chart of an automatic pressure control method for a governor hydraulic device according to an embodiment of this disclosure. Figure 1 As shown, the automatic pressure control method for the governor hydraulic device includes:

[0037] Step S11: After the governor hydraulic device is overhauled, set the pressure target value, pressure build-up replenishment oil level, rated oil pressure, and medium-pressure air system pressure threshold. When the command to enter the pressure build-up condition is received, obtain the return oil tank level limit, pressure oil tank level limit, and total oil consumption limit. Also obtain the measured return oil tank level from the first oil level measurement unit, the measured pressure oil tank level from the second oil level measurement unit, and the measured pressure oil tank pressure from the pressure sensor.

[0038] In step S11, the measured oil level in the return tank is acquired by the first oil level measuring unit. The first oil level measuring unit is arranged on the return tank. The measured oil level in the return tank includes a first liquid level signal analog quantity and a first liquid level signal switch quantity. Specifically, the first oil level measuring unit includes a first liquid level gauge and a first liquid level sensor. The first liquid level gauge is used to measure the oil level in the return tank in real time and output the first liquid level signal switch quantity. The first liquid level sensor is used to measure the oil level in the return tank in real time and output the first liquid level signal analog quantity.

[0039] In step S11, the measured oil level in the pressure tank is acquired by the second oil level measuring unit. The second oil level measuring unit is located on the pressure tank. The measured oil level in the pressure tank includes a second analog level signal and a second digital level signal. Specifically, the second oil level measuring unit includes a second level gauge and a second level sensor. The second level gauge is used to measure the oil level in the pressure tank in real time and output a second digital level signal. The second level sensor is used to measure the oil level in the pressure tank in real time and output a second analog level signal.

[0040] In step S11, the measured pressure value of the pressure tank is obtained by a pressure sensor arranged on the pressure tank.

[0041] In step S11, the target pressure for pressure build-up is set after the governor hydraulic system maintenance is completed, and the target pressure is the initial target pressure value. The target pressure for pressure build-up can be automatically updated during subsequent pressure build-up processes until the updated value is the rated hydraulic pressure. Furthermore, the rated hydraulic pressure is set based on actual needs. For example, the rated hydraulic pressure is 6.3 MPa.

[0042] In step S11, the return oil tank level limits include an upper limit and a lower limit. The upper limit includes both an analog value and a digital value. The lower limit includes both an analog value and a digital value.

[0043] In step S11, the total fuel consumption limit includes an upper limit and a lower limit.

[0044] Step S12: Based on the oil level limit of the return oil tank, the target value of the pressure build-up pressure, the oil level of the pressure build-up air supply, the measured oil level of the return oil tank, the measured oil level of the pressure oil tank, and the measured pressure value of the pressure oil tank, control the working state of the valve pump assembly to add oil to the hydraulic pipeline, and obtain the amount of oil used in the hydraulic pipeline after the hydraulic pipeline is filled.

[0045] Figure 2 This diagram illustrates a flow chart of the hydraulic pipeline refueling process provided in an embodiment of the present disclosure.

[0046] In step S12, as Figure 2 As shown, based on the return oil tank level limit, the pressure build-up target value, the pressure build-up replenishment oil level, the measured return oil tank level, the measured pressure tank level, and the measured pressure of the pressure tank, the operating state of the control valve pump assembly is controlled to add oil to the hydraulic pipeline, including: if the measured return oil tank level does not exceed the lower limit of the return oil tank level, the return oil tank supply valve is opened and the oil pump stops working; if the measured return oil tank level reaches the upper limit of the return oil tank level, the return oil tank supply valve is closed and the oil pump operates (step S121); when When the measured oil level in the pressure tank reaches the pressure build-up and air replenishment level, the comparison between the measured oil level in the return oil tank and the return oil tank level limit is stopped, and the return oil tank supply valve is closed and the oil pump stops working (step S122). When the measured oil level in the pressure tank reaches the pressure build-up and air replenishment level, the oil tank air replenishment valve is opened to replenish air to the pressure tank until the measured pressure value of the pressure tank reaches the target pressure value for pressure build-up. Then, the oil tank air replenishment valve is closed, and the oil tank supply valve is opened to add oil to the hydraulic pipeline (step S123). The target pressure value for pressure build-up reached by the measured pressure value in step S123 is the target pressure value for pressure build-up set after maintenance.

[0047] In step S12, after the hydraulic pipeline is filled with oil, the oil supply valve of the control tank is closed. Considering that the oil in the hydraulic pipeline comes from the pressure tank, the amount of oil reduced from the pressure tank is the amount of oil used in the hydraulic pipeline. In other words, the amount of oil used in the hydraulic pipeline can be obtained based on the amount of oil reduced from the pressure tank during the period from before the hydraulic pipeline is filled to the end of the filling process.

[0048] Step S13: Update the pressure build-up target value and replenish oil to the return oil tank and pressure oil tank until the measured oil level in the pressure oil tank reaches the pressure build-up replenishment oil level.

[0049] In step S13, the target pressure for pressure buildup is automatically updated. Specifically, after the hydraulic pipeline is filled with oil, the target pressure for pressure buildup set after the maintenance is completed is automatically updated to obtain a new target pressure for pressure buildup.

[0050] In this embodiment, since the hydraulic pipeline is filled with oil in step S12, resulting in the measured oil level in the pressure tank being lower than the pressure build-up replenishment oil level, it is necessary to replenish oil in the return oil tank and pressure tank after updating the pressure build-up target value in step S13. The specific oil replenishment process is as follows:

[0051] In step S13, oil is replenished to the return oil tank and the pressure oil tank until the measured oil level in the pressure oil tank reaches the pressure build-up and air replenishment oil level. Specifically, this includes: calculating the total oil consumption based on the measured oil level in the return oil tank, the measured oil level in the pressure oil tank, and the oil consumption in the hydraulic pipeline; and controlling the working state of the control valve pump assembly based on the measured oil level in the return oil tank, the measured oil level in the pressure oil tank, the total oil consumption, the oil level limit in the return oil tank, the upper limit of the oil level in the pressure oil tank, and the total oil consumption limit, so as to replenish oil to the return oil tank and the pressure oil tank until the measured oil level in the pressure oil tank reaches the pressure build-up and air replenishment oil level.

[0052] In step S13, the total oil consumption is calculated based on the measured oil level in the return oil tank, the measured oil level in the pressure oil tank, and the oil consumption in the hydraulic pipeline, including: calculating the oil consumption in the return oil tank based on the measured oil level in the return oil tank; calculating the oil consumption in the pressure oil tank based on the measured oil level in the pressure oil tank; and calculating the total oil consumption based on the oil consumption in the return oil tank, the oil consumption in the pressure oil tank, and the oil consumption in the hydraulic pipeline.

[0053] In this embodiment, if the return oil tank is cylindrical, the oil volume in the return oil tank is calculated based on the bottom area of ​​the return oil tank and the measured oil level. Furthermore, considering that during maintenance, all pressurized oil in the air conditioning speed unit is drained first, and then the drain valve of the return oil tank, the supply valve of the pressure oil tank, and the drain valve of the pressure oil tank are closed. After maintenance is completed and a command to enter pressure-building condition is received, oil is injected into the return oil tank using the clean oil tank of the turbine oil system. Therefore, the oil output from the clean oil tank and the oil inflow into the return oil tank can be calculated based on the drop height of the oil level in the clean oil tank and the rise height of the oil level in the return oil tank, respectively. A comparative analysis (e.g., calculating the ratio) is performed on the oil output from the clean oil tank and the oil inflow into the return oil tank to obtain the return oil volume correction coefficient. At this point, the return oil volume V1 can be calculated using the return oil volume correction coefficient k1, the bottom area S1 of the return oil tank, and the measured oil level H1 of the return oil tank, i.e., V1 = k1 * S1 * H1.

[0054] In this embodiment, if the middle part of the pressure tank is cylindrical and the bottom and top of the pressure tank are generally hemispherical, the oil volume of the pressure tank is calculated based on the bottom volume V0 of the pressure tank, the measured oil level H2 of the pressure tank, and the cross-sectional area S2 of the middle part of the pressure tank. The bottom volume V0 of the pressure tank is a fixed quantity, which can be obtained from stored system parameters. Furthermore, considering that the pressure tank is replenished with oil using an oil pump, and the oil comes from the return tank, the amount of oil lost from the return tank is calculated. A comparison is made between the amount of oil lost from the return tank and the calculated oil volume of the pressure tank (e.g., calculating the ratio), thereby obtaining the pressure tank oil volume correction coefficient k2. Then, the actual oil volume V2 of the middle part of the pressure tank is calculated using the pressure tank oil volume correction coefficient k2, the measured oil level H2 of the pressure tank, and the cross-sectional area S2 of the middle part of the pressure tank, i.e., V2 = k2 * S2 * H2. The oil volume in the pressure tank is obtained based on the actual oil volume V2 in the middle of the pressure tank and the bottom volume V0 of the pressure tank.

[0055] In this embodiment, the total oil consumption V satisfies V=V1+V2+V0+V3=k1*S1*H1+k2*S2*H2+V0+V3. Wherein, V3 is the oil consumption of the hydraulic pipeline.

[0056] In step S13, the working state of the control valve pump assembly is determined based on the measured oil level in the return oil tank, the measured oil level in the pressure oil tank, the total oil consumption, the oil level limit in the return oil tank, the upper limit of the oil level in the pressure oil tank, and the total oil consumption limit, in order to replenish oil to the return oil tank and the pressure oil tank until the measured oil level in the pressure oil tank reaches the pressure build-up and gas replenishment oil level. This includes: determining the return oil tank replenishment demand based on the measured oil level in the return oil tank, the measured oil level in the pressure oil tank, the total oil consumption, the oil level limit in the return oil tank, the upper limit of the oil level in the pressure oil tank, and the total oil consumption limit. If replenishment is required, the return oil tank supply valve is opened and the oil pump stops working. If replenishment is not required, the return oil tank supply valve is closed and the oil pump works to replenish oil to the pressure oil tank. When the measured oil level in the pressure oil tank reaches the pressure build-up and gas replenishment oil level, the determination of the return oil tank replenishment demand is stopped, and the return oil tank supply valve is closed and the oil pump stops working.

[0057] In step S13, the oil replenishment requirement of the return oil tank is determined based on the measured oil level of the return oil tank, the measured oil level of the pressure oil tank, the total oil consumption, the oil level limit of the return oil tank, the upper limit of the oil level of the pressure oil tank, and the upper limit of the total oil consumption. This includes: when the analog quantity of the first liquid level signal does not exceed the analog quantity of the lower limit of the return oil tank oil level and the switch quantity of the first liquid level signal does not exceed the switch quantity of the lower limit of the return oil tank oil level, or when the total oil consumption is lower than the lower limit of the total oil consumption, the return oil tank needs to be replenished; if at least one of the following conditions is met, the return oil tank does not need to be replenished: the analog quantity of the first liquid level signal reaches the analog quantity of the upper limit of the return oil tank oil level, the switch quantity of the first liquid level signal reaches the switch quantity of the upper limit of the return oil tank oil level, the total oil consumption reaches the upper limit of the total oil consumption, the analog quantity of the second liquid level signal reaches the analog quantity of the upper limit of the pressure oil tank oil level, or the switch quantity of the second liquid level signal reaches the switch quantity of the upper limit of the pressure oil tank oil level, the return oil tank does not need to be replenished.

[0058] Compared to existing level switches that only utilize the low level signal of the return oil tank (i.e., the switching quantity of the lower limit of the return oil tank level) and the high level signal of the return oil tank (the switching quantity of the upper limit of the return oil tank level), in step S13, the measured oil level of the return oil tank, the measured oil level of the pressure tank, and the corresponding limit all include two types of level signals (i.e., switching quantity and analog quantity). By using dual signals for control, if one level signal is faulty during subsequent judgment, the other level signal can be used for judgment. This avoids the situation where a single level signal is lost due to a fault, causing misjudgment, reducing the possibility of misjudgment of oil replenishment demand, and improving the reliability of pressure tank gas replenishment and pressure building.

[0059] In some embodiments, in step S13, if the total fuel consumption is lower than the lower limit of total fuel consumption or the total fuel consumption reaches the upper limit of total fuel consumption, an alarm can be triggered.

[0060] Step S14: When the measured oil level in the pressure oil tank reaches the pressure build-up and air replenishment level, control the air replenishment valve of the oil tank to open to replenish air to the pressure oil tank until the measured pressure value of the pressure oil tank reaches the rated oil pressure, thereby completing the automatic pressure build-up of the governor oil pressure device.

[0061] In step S14, when the measured oil level in the pressure tank reaches the pressure build-up and air replenishment level, the air replenishment valve of the oil tank is opened to replenish air to the pressure tank until the measured pressure value of the pressure tank reaches the rated oil pressure, thereby completing the automatic pressure build-up of the governor oil pressure device. Specifically, this includes: when the measured oil level in the pressure tank reaches the pressure build-up and air replenishment level, the air replenishment valve of the oil tank is opened to replenish air to the pressure tank. If the measured pressure value of the intermediate pressure air system is lower than the intermediate pressure air system pressure threshold during the air replenishment process, the air replenishment valve of the oil tank is closed and the intermediate pressure air system is filled with air using an air compressor until the measured pressure value of the intermediate pressure air system is higher than the intermediate pressure air system pressure threshold, and then the air replenishment valve of the oil tank is opened again. If the measured pressure value of the pressure tank reaches the updated pressure build-up target value during the air replenishment process, the pressure build-up target value is updated again and air replenishment continues until the updated pressure build-up target value is the rated oil pressure. If the measured pressure value of the pressure tank reaches the rated oil pressure, the automatic pressure build-up is completed.

[0062] In step S14, the opening and closing of the air replenishment valve is controlled based on the measured pressure value of the medium-pressure gas system. During the air replenishment process in the pressure-building phase, if the measured pressure value of the medium-pressure gas system is lower than the medium-pressure gas system pressure threshold, the oil tank air replenishment valve is closed, and the air compressor is used to fill the medium-pressure gas system until the measured pressure value of the medium-pressure gas system is higher than the medium-pressure gas system pressure threshold, and then the oil tank air replenishment valve is opened. In some embodiments, the medium-pressure gas system pressure is generally maintained within a preset pressure range, such as 6.25-6.65 MPa. If the pressure is lower than the minimum value of the preset pressure range, i.e., 6.25 MPa, the air replenishment valve is closed, and both sets of air compressors operate. When the pressure is higher than the maximum value of the preset pressure range, i.e., 6.65 MPa, the air replenishment valve is opened. When the pressure drops back to 6.25 MPa, the air replenishment valve is closed, and the cycle is repeated. During this period, the air compressor does not stop operating until the measured pressure value of the pressure oil tank reaches the rated oil pressure.

[0063] In some embodiments, an alarm can be triggered if the measured pressure of the medium-pressure gas system is lower than the low-pressure warning value (e.g., 6.2 MPa).

[0064] In the automatic pressure control method of the governor hydraulic device according to the embodiments of this disclosure, the governor hydraulic device includes a return oil tank, a pressure oil tank, a valve pump assembly, and hydraulic pipelines. The valve pump assembly includes a return oil tank supply valve, an oil pump, an oil tank supply valve, and an oil tank air supply valve. The return oil tank is connected to the clean oil tank of the turbine oil system via the return oil tank supply valve. The return oil tank is connected to the pressure oil tank via the oil pump. The pressure oil tank is connected to the hydraulic pipelines via the oil tank supply valve. The pressure oil tank is connected to the medium-pressure air system via the oil tank air supply valve. A first oil level measuring unit is arranged on the return oil tank, and a second oil level measuring unit and a pressure sensor are arranged on the pressure oil tank. The pressure is automatically controlled. The control method includes: after the governor hydraulic device is overhauled, setting the target value for pressure build-up, the pressure build-up replenishment oil level, the rated oil pressure, and the pressure threshold of the medium-pressure air system; when receiving a command to enter the pressure build-up condition, acquiring the return oil tank level limit, the pressure tank oil level upper limit, and the total oil consumption limit; and acquiring the measured oil level in the return oil tank from the first oil level measurement unit, the measured oil level in the pressure tank from the second oil level measurement unit, and the measured pressure value in the pressure tank from the pressure sensor; based on the return oil tank level limit, the target value for pressure build-up, the pressure build-up replenishment oil level, the measured oil level in the return oil tank, the measured oil level in the pressure tank, and the pressure value in the pressure tank... The measured pressure value is used to control the operating status of the valve and pump assembly to add oil to the hydraulic lines. After adding oil to the hydraulic lines, the oil consumption in the hydraulic lines is obtained. The target pressure value for pressure build-up is updated. Based on the measured oil level in the return tank, the measured oil level in the pressure tank, and the oil consumption in the hydraulic lines, the total oil consumption is calculated. Based on the measured oil level in the return tank, the measured oil level in the pressure tank, the total oil consumption, the oil level limit in the return tank, the upper limit of the oil level in the pressure tank, and the total oil consumption limit, the operating status of the valve and pump assembly is controlled to replenish oil to the return tank and the pressure tank until the measured oil level in the pressure tank reaches the pressure build-up replenishment oil level. Once the measured oil level in the pressure tank reaches the pressure build-up replenishment oil level... When the pressure tank is replenished, the oil tank air supply valve is opened to supply air to the pressure tank. If the measured pressure of the medium-pressure air system is lower than the medium-pressure air system pressure threshold during the air supply process, the oil tank air supply valve is closed and the air compressor is used to charge the medium-pressure air system until the measured pressure of the medium-pressure air system is higher than the medium-pressure air system pressure threshold. Then the oil tank air supply valve is opened again. If the measured pressure of the pressure tank reaches the updated pressure build-up target value during the air supply process, the pressure build-up target value is updated again and air supply continues until the updated pressure build-up target value is the rated oil pressure. If the measured pressure of the pressure tank reaches the rated oil pressure, the automatic pressure build-up is completed.In this scenario, automatic pressure building is achieved by comprehensively considering the target pressure building value, the pressure building replenishment oil level, the rated oil pressure, the medium-pressure air system pressure threshold, the return oil tank level limit, the pressure oil tank level upper limit, the total oil consumption limit, the measured return oil tank level, the measured pressure oil tank level, the measured pressure of the pressure oil tank, and the oil consumption in the hydraulic pipeline. This frees up manpower and improves the efficiency of pressure tank replenishment and pressure building. Furthermore, during the pressure building process, the total oil consumption is calculated based on the measured return oil tank level, the measured pressure oil tank level, and the oil consumption in the hydraulic pipeline. This method combines the measured oil level in the return oil tank, the measured oil level in the pressure tank, and the operating status of the total oil consumption control valve pump assembly to replenish oil to the return oil tank and the pressure tank. Compared to existing methods that only determine whether to replenish oil to the return oil tank based on the measured oil level, this method reduces the possibility of misjudging the replenishment demand. In addition, it combines the pressure threshold of the medium-pressure gas system and the target pressure value for pressure buildup to replenish the pressure tank, avoiding the phenomenon of excessively low pressure in the medium-pressure gas system during replenishment, thereby improving the reliability of pressure tank replenishment and pressure buildup.

[0065] This disclosure relates to the field of automatic control technology for rapid pressure recovery after maintenance of medium-pressure hydraulic devices. The method described herein optimizes existing governor hydraulic device pressure control systems, with the main optimizations including:

[0066] 1) Calculate the total oil consumption of the governor's hydraulic system in real time using parameters such as the oil level measured by the oil level measurement units of the governor's return oil tank and pressure oil tank, thereby improving the precise control and monitoring of oil consumption and achieving the purpose of fixed-value management of oil supply and monitoring whether the hydraulic system's pressure oil is leaking; 2) Based on the comprehensive judgment of the liquid level in the return oil tank, the liquid level in the pressure oil tank, and the total oil consumption of the governor's hydraulic system, control the opening and closing of the return oil tank's oil supply valve; 3) Introduce the analog signal of the main pipe pressure of the medium-pressure air system's pressure tank (i.e., the measured value of the medium-pressure air system pressure) into the governor's hydraulic system control process, and combine the measured values ​​of the medium-pressure air system pressure and the pressure oil tank pressure, based on the target value of the pressure build-up pressure, control the opening and closing of the air replenishment valve. Through the above optimizations, the pressure inside the governor's pressure tank is automatically adjusted, achieving the goal of automatic and rapid recovery of the hydraulic system pressure after maintenance. It also avoids excessively rapid air replenishment during pressure build-up in the hydraulic tank or simultaneous air replenishment from multiple units' hydraulic tanks, which could lead to excessively low pressure in the intermediate-pressure gas system. This achieves the automatic pressure build-up function of the hydraulic tank, improves the pressure build-up efficiency of the hydraulic tank, and eliminates the need for personnel to constantly monitor the pressure rise in the pressure tank and the pressure drop in the intermediate-pressure gas system, thus freeing up manpower and avoiding the waste of human resources.

[0067] The following are system embodiments of this disclosure, which can be used to execute the method embodiments of this disclosure. For details not disclosed in the system embodiments of this disclosure, please refer to the method embodiments of this disclosure.

[0068] Please see Figure 3 , Figure 3This diagram illustrates a block diagram of an automatic pressure control system for a governor hydraulic device provided in an embodiment of this disclosure. This automatic pressure control system for the governor hydraulic device can be implemented as all or part of a system through software, hardware, or a combination of both. The governor hydraulic device includes a return oil tank, a pressure oil tank, a valve-pump assembly, and hydraulic pipelines. The valve-pump assembly includes a return oil tank supply valve, an oil pump, an oil tank supply valve, and an oil tank air supply valve. The return oil tank is connected to the clean oil tank of the turbine oil system via the return oil tank supply valve. The return oil tank is connected to the pressure oil tank via the oil pump. The pressure oil tank is connected to the hydraulic pipelines via the oil tank supply valve. The pressure oil tank is connected to the medium-pressure air system via the oil tank air supply valve. The automatic pressure control system 10 for the governor hydraulic device includes a data acquisition module 11, a first control module 12, a calculation module 13, and a second control module 14, wherein:

[0069] The acquisition module 11 includes a first oil level measuring unit arranged on the return oil tank, a second oil level measuring unit arranged on the pressure oil tank, and a pressure sensor. The first oil level measuring unit is used to obtain the measured oil level in the return oil tank, the second oil level measuring unit is used to obtain the measured oil level in the pressure oil tank, and the pressure sensor is used to obtain the measured pressure value in the pressure oil tank. The acquisition module is also used to set the pressure build-up target value, pressure build-up replenishment oil level, rated oil pressure, and medium-pressure air system pressure threshold after the governor oil pressure device has been overhauled.

[0070] The first control module 12 is used to obtain the oil level limit of the return oil tank, the upper limit of the oil level of the pressure oil tank, and the total oil consumption limit when it receives the command to enter the pressure building condition. Based on the oil level limit of the return oil tank, the target value of the pressure building pressure, the oil level of the pressure building gas supply, the measured oil level of the return oil tank, the measured oil level of the pressure oil tank, and the measured pressure value of the pressure oil tank, it controls the working state of the valve and pump assembly to add oil to the hydraulic pipeline.

[0071] The calculation module 13 is used to obtain the amount of oil used in the hydraulic pipeline after the hydraulic pipeline is filled with oil;

[0072] The second control module 14 is used to update the pressure build-up target value, calculate the total oil consumption based on the measured oil level in the return tank, the measured oil level in the pressure tank, and the oil consumption in the hydraulic pipeline, and control the working status of the valve and pump assembly based on the measured oil level in the return tank, the measured oil level in the pressure tank, the total oil consumption, the oil level limit in the return tank, the upper limit of the oil level in the pressure tank, and the total oil consumption limit, so as to replenish oil to the return tank and the pressure tank until the measured oil level in the pressure tank reaches the pressure build-up air replenishment oil level; when the measured oil level in the pressure tank reaches the pressure build-up air replenishment oil level, control the oil tank air replenishment valve to open to replenish air to the pressure tank. If the measured pressure of the medium-pressure gas system is lower than the medium-pressure gas system pressure threshold during the gas replenishment process, the gas replenishment valve of the oil tank will be closed and the air compressor will be used to fill the medium-pressure gas system until the measured pressure of the medium-pressure gas system is higher than the medium-pressure gas system pressure threshold. Then the gas replenishment valve of the oil tank will be opened. If the measured pressure of the pressure oil tank reaches the updated pressure target value during the gas replenishment process, the pressure target value will be updated again and gas replenishment will continue until the updated pressure target value is the rated oil pressure. If the measured pressure of the pressure oil tank reaches the rated oil pressure, the automatic pressure building is completed.

[0073] Optionally, the data acquisition module 11 also includes a touchscreen, on which the target pressure for pressure build-up, the oil level for pressure build-up replenishment, the rated oil pressure, and the pressure threshold of the medium-pressure gas system can be set. Both the target pressure for pressure build-up and the oil level for pressure build-up replenishment can be modified according to actual pressure build-up requirements. The target pressure for pressure build-up can be determined using analog signals, and the oil level for pressure build-up replenishment can also be determined using analog signals.

[0074] Optionally, the touchscreen may have two operating condition switches, which may be buttons. For example, there may be a normal operating condition button and a pressure build-up operating condition button. When the normal operating condition button is closed, the governor hydraulic system is in normal operating condition, and the control logic under normal operating condition is the existing control logic. When the pressure build-up operating condition button is closed, a command to enter the pressure build-up operating condition is generated. At this time, the automatic pressure control system of the governor hydraulic system executes the automatic pressure control method in the embodiments of this disclosure.

[0075] Optionally, the touchscreen also includes indicator lights. When the pressure build-up mode button is closed, the indicator lights illuminate, indicating the pressure build-up mode is active. When the normal operation mode button is closed, the indicator lights turn off, indicating the normal operation mode is active.

[0076] Optionally, the return oil tank level limit includes an upper limit and a lower limit. The first control module 12 is specifically used for: if the measured oil level in the return oil tank does not exceed the lower limit, controlling the return oil tank supply valve to open and the oil pump to stop working; if the measured oil level in the return oil tank reaches the upper limit, controlling the return oil tank supply valve to close and the oil pump to work; when the measured oil level in the pressure tank reaches the pressure build-up air replenishment level, stopping the comparison between the measured oil level in the return oil tank and the return oil tank level limit, and controlling the return oil tank supply valve to close and the oil pump to stop working; when the measured oil level in the pressure tank reaches the pressure build-up air replenishment level, controlling the oil tank air replenishment valve to open to replenish air to the pressure tank until the measured pressure value of the pressure tank reaches the pressure build-up target value, then controlling the oil tank air replenishment valve to close and controlling the oil tank supply valve to open to add oil to the hydraulic pipeline.

[0077] Optionally, the second control module 14 is specifically used to: determine the oil replenishment demand of the return oil tank based on the measured oil level of the return oil tank, the measured oil level of the pressure oil tank, the total oil consumption, the oil level limit of the return oil tank, the upper limit of the oil level of the pressure oil tank, and the total oil consumption limit; if oil replenishment is required, control the oil supply valve of the return oil tank to open and the oil pump to stop working; if oil replenishment is not required, control the oil supply valve of the return oil tank to close and the oil pump to work to replenish the pressure oil tank; when the measured oil level of the pressure oil tank reaches the pressure building and gas replenishment oil level, stop the oil replenishment demand determination of the return oil tank, and control the oil supply valve of the return oil tank to close and the oil pump to stop working.

[0078] Optionally, the total oil consumption limit includes an upper limit and a lower limit, the measured oil level in the return tank includes a first level signal analog quantity and a first level signal switch quantity, and the measured oil level in the pressure tank includes a second level signal analog quantity and a second level signal switch quantity. The second control module 14 is specifically used to: replenish oil in the return tank when the first level signal analog quantity does not exceed the analog quantity of the lower limit of the return tank oil level and the first level signal switch quantity does not exceed the switch quantity of the lower limit of the return tank oil level, or when the total oil consumption is lower than the lower limit of the total oil consumption; if at least one of the following conditions is met: the first level signal analog quantity reaches the analog quantity of the upper limit of the return tank oil level, the first level signal switch quantity reaches the switch quantity of the upper limit of the return tank oil level, the total oil consumption reaches the upper limit of the total oil consumption, the second level signal analog quantity reaches the analog quantity of the upper limit of the pressure tank oil level, or the second level signal switch quantity reaches the switch quantity of the upper limit of the pressure tank oil level, then the return tank does not need to be replenished.

[0079] It should be noted that the automatic pressure control system for the governor hydraulic device provided in the above embodiments is only illustrated by the division of the above functional modules when executing the automatic pressure control method for the governor hydraulic device. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the automatic pressure control equipment for the governor hydraulic device can be divided into different functional modules to complete all or part of the functions described above. In addition, the automatic pressure control system for the governor hydraulic device provided in the above embodiments and the automatic pressure control method embodiments for the governor hydraulic device belong to the same concept, and its implementation process is detailed in the method embodiments, which will not be repeated here.

[0080] The sequence numbers of the embodiments disclosed above are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0081] In the automatic pressure control system of the governor hydraulic device according to embodiments of this disclosure, the acquisition module includes a first oil level measuring unit arranged on the return oil tank, a second oil level measuring unit arranged on the pressure oil tank, and a pressure sensor. The first oil level measuring unit is used to acquire the measured oil level in the return oil tank, the second oil level measuring unit is used to acquire the measured oil level in the pressure oil tank, and the pressure sensor is used to acquire the measured pressure value in the pressure oil tank. The acquisition module is also used to set the pressure build-up target value, the pressure build-up replenishment oil level, and the rated pressure after the governor hydraulic device has been overhauled. The system sets pressure thresholds for both the fixed oil pressure and the medium-pressure gas system. The first control module, upon receiving a command to enter pressure-building mode, acquires the return oil tank level limit, the pressure tank oil level limit, and the total oil consumption limit. Based on these limits, the target pressure value, the pressure-building gas supply level, the measured return oil tank level, the measured pressure tank level, and the measured pressure tank pressure, it controls the operating status of the valve and pump components to add oil to the hydraulic lines. The calculation module acquires the hydraulic line oil consumption after oiling is completed. The second control module updates the pressure-building status. The target pressure value is calculated based on the measured oil level in the return oil tank, the measured oil level in the pressure tank, and the oil consumption in the hydraulic pipeline. The total oil consumption is calculated using these parameters. The operating status of the control valve and pump assembly is then adjusted based on the measured oil level in the return oil tank, the measured oil level in the pressure tank, the total oil consumption, the return oil tank level limit, the pressure tank level upper limit, and the total oil consumption limit. This ensures oil is replenished to the return oil tank and pressure tank until the measured oil level in the pressure tank reaches the pressure build-up and air replenishment level. When the measured oil level in the pressure tank reaches the pressure build-up and air replenishment level, the air replenishment valve in the oil tank is opened to replenish air to the pressure tank. During the air replenishment process... If the measured pressure of the medium-pressure gas system is lower than the medium-pressure gas system pressure threshold, the oil tank air supply valve is closed and the medium-pressure gas system is filled with air using an air compressor until the measured pressure of the medium-pressure gas system is higher than the medium-pressure gas system pressure threshold. Then the oil tank air supply valve is opened. If the measured pressure of the pressure oil tank reaches the updated pressure target value during the air supply process, the pressure target value is updated again and air supply continues until the updated pressure target value is the rated oil pressure. If the measured pressure of the pressure oil tank reaches the rated oil pressure, the automatic pressure building is completed.In this scenario, automatic pressure building is achieved by comprehensively considering the target pressure building value, the pressure building replenishment oil level, the rated oil pressure, the medium-pressure air system pressure threshold, the return oil tank level limit, the pressure oil tank level upper limit, the total oil consumption limit, the measured return oil tank level, the measured pressure oil tank level, the measured pressure of the pressure oil tank, and the oil consumption in the hydraulic pipeline. This frees up manpower and improves the efficiency of pressure tank replenishment and pressure building. Furthermore, during the pressure building process, the total oil consumption is calculated based on the measured return oil tank level, the measured pressure oil tank level, and the oil consumption in the hydraulic pipeline. The system comprehensively considers the measured oil level in the return oil tank, the measured oil level in the pressure tank, and the operating status of the total oil consumption control valve pump assembly to replenish oil to the return oil tank and the pressure tank. Compared to existing systems that only determine whether to replenish oil to the return oil tank based on the measured oil level, this system reduces the possibility of misjudging the replenishment demand. In addition, it combines the pressure threshold of the medium-pressure gas system and the target pressure value for pressure buildup to replenish the pressure tank, avoiding the phenomenon of excessively low pressure in the medium-pressure gas system during replenishment, thereby improving the reliability of pressure tank replenishment and pressure buildup.

[0082] According to embodiments of this disclosure, this disclosure also provides an automatic pressure control device for a speed governor hydraulic device, a readable storage medium, and a computer program product.

[0083] Figure 4 This is a block diagram of an automatic pressure control device for a governor hydraulic device used to implement the automatic pressure control method for the governor hydraulic device according to embodiments of the present disclosure. The automatic pressure control device for a governor hydraulic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The automatic pressure control device for a governor hydraulic device can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable electronic devices, and other similar computing devices. The components, connections and relationships between components, and functions shown in this disclosure are merely examples and are not intended to limit the implementation of the present disclosure as described and / or claimed herein.

[0084] like Figure 4 As shown, the automatic pressure control device 20 for the governor hydraulic system includes a computing unit 21, which can perform various appropriate actions and processes based on a computer program stored in a read-only memory (ROM) 22 or a computer program loaded from a storage unit 28 into a random access memory (RAM) 23. The RAM 23 can also store various programs and data required for the operation of the automatic pressure control device 20. The computing unit 21, ROM 22, and RAM 23 are interconnected via a bus 24. An input / output (I / O) interface 25 is also connected to the bus 24.

[0085] Multiple components in the automatic pressure control device 20 of the speed governor hydraulic unit are connected to the I / O interface 25, including: an input unit 26, such as a keyboard, mouse, etc.; an output unit 27, such as various types of displays, speakers, etc.; a storage unit 28, such as a disk, optical disk, etc., which is communicatively connected to the computing unit 21; and a communication unit 29, such as a network card, modem, wireless transceiver, etc. The communication unit 29 allows the automatic pressure control device 20 of the speed governor hydraulic unit to exchange information / data with other automatic pressure control devices of the speed governor hydraulic unit through computer networks such as the Internet and / or various telecommunications networks.

[0086] The computing unit 21 can be various general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the computing unit 21 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The computing unit 21 performs the various methods and processes described above, such as performing an automatic pressure control method for a governor hydraulic device. For example, in some embodiments, the automatic pressure control method for a governor hydraulic device can be implemented as a computer software program tangibly contained in a machine-readable medium, such as storage unit 28. In some embodiments, part or all of the computer program can be loaded and / or installed on the automatic pressure control device 20 for a governor hydraulic device via ROM 22 and / or communication unit 29. When the computer program is loaded into RAM 23 and executed by the computing unit 21, one or more steps of the automatic pressure control method for a governor hydraulic device described above can be performed. Alternatively, in other embodiments, the computing unit 21 may be configured by any other suitable means (e.g., by means of firmware) to perform an automatic control method for governor hydraulic device pressure.

[0087] Various embodiments of the systems and techniques described above in this disclosure can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic electronic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include: implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0088] The program code used to implement the methods of this disclosure may be written in any combination of one or more programming languages. This program code may be provided to a processor or controller of a general-purpose computer, special-purpose computer, or other programmable data processing apparatus, such that when executed by the processor or controller, the program code causes the functions / operations specified in the flowcharts and / or block diagrams to be implemented. The program code may be executed entirely on a machine, partially on a machine, as a standalone software package partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0089] In this disclosure, a machine-readable medium can be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, apparatus, or governor hydraulic pressure automatic control device. A machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. Machine-readable media can be, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatuses, or electronic devices, or any suitable combination of the foregoing. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage electronics, magnetic storage electronics, or any suitable combination of the foregoing.

[0090] To provide interaction with a user, the systems and techniques described herein can be implemented on a computer having: a display device for displaying information to the user (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor); and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the computer. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0091] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or middleware components (e.g., application servers), or frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), the Internet, and blockchain networks.

[0092] Computer systems can include clients and servers. Clients and servers are generally geographically separated and typically interact via communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. A server can be a cloud server, also known as a cloud computing server or cloud host, a hosting product within the cloud computing service ecosystem, addressing the shortcomings of traditional physical hosts and VPS (Virtual Private Server, or simply "VPS") services, such as high management difficulty and weak business scalability. Servers can also be servers for distributed systems or servers incorporating blockchain technology.

[0093] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this disclosure can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this disclosure can be achieved, and this disclosure does not impose any limitations herein.

[0094] The specific embodiments described above do not constitute a limitation on the scope of protection of this disclosure. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A method for automatic pressure control of a governor hydraulic device, characterized in that, The governor hydraulic device includes a return oil tank, a pressure oil tank, a valve pump assembly, and hydraulic lines. The valve pump assembly includes a return oil tank supply valve, an oil pump, an oil tank supply valve, and an oil tank air supply valve. The return oil tank is connected to the clean oil tank of the turbine oil system via the return oil tank supply valve. The return oil tank is connected to the pressure oil tank via the oil pump. The pressure oil tank is connected to the hydraulic lines via the oil tank supply valve. The pressure oil tank is connected to the medium-pressure air system via the oil tank air supply valve. A first oil level measuring unit is arranged on the return oil tank, and a second oil level measuring unit and a pressure sensor are arranged on the pressure oil tank. The automatic pressure control method includes: After the governor hydraulic device is overhauled, set the pressure target value, pressure build-up oil level, rated oil pressure, and medium-pressure air system pressure threshold. When the command to enter the pressure build-up condition is received, obtain the return oil tank level limit, pressure tank level limit, and total oil consumption limit. Also obtain the measured return oil tank level from the first oil level measurement unit, the measured pressure tank level from the second oil level measurement unit, and the measured pressure tank pressure from the pressure sensor. Based on the oil level limit of the return oil tank, the target value of the pressure build-up pressure, the oil level of the pressure build-up replenishment gas, the measured oil level of the return oil tank, the measured oil level of the pressure oil tank, and the measured pressure value of the pressure oil tank, the working state of the valve pump assembly is controlled to add oil to the hydraulic pipeline, and the amount of oil used in the hydraulic pipeline is obtained after the oil is added to the hydraulic pipeline. The target pressure value for pressure build-up is updated. The total oil consumption is calculated based on the measured oil level in the return oil tank, the measured oil level in the pressure oil tank, and the oil consumption in the hydraulic pipeline. The working state of the valve pump assembly is controlled based on the measured oil level in the return oil tank, the measured oil level in the pressure oil tank, the total oil consumption, the oil level limit in the return oil tank, the upper limit of the oil level in the pressure oil tank, and the total oil consumption limit, so as to replenish oil to the return oil tank and the pressure oil tank until the measured oil level in the pressure oil tank reaches the pressure build-up replenishment oil level. When the measured oil level in the pressure tank reaches the pressure build-up air replenishment level, the air replenishment valve of the oil tank is opened to replenish air to the pressure tank. If the measured pressure of the medium-pressure air system is lower than the medium-pressure air system pressure threshold during the air replenishment process, the air replenishment valve of the oil tank is closed and the medium-pressure air system is filled with air using an air compressor until the measured pressure of the medium-pressure air system is higher than the medium-pressure air system pressure threshold. Then the air replenishment valve of the oil tank is opened again. If the measured pressure of the pressure tank reaches the updated pressure build-up target value during the air replenishment process, the pressure build-up target value is updated again and air replenishment continues until the updated pressure build-up target value is the rated oil pressure. If the measured pressure of the pressure tank reaches the rated oil pressure, the automatic pressure build-up is completed. The return oil tank level limit includes an upper limit and a lower limit. The step of controlling the operating state of the valve-pump assembly to add oil to the hydraulic pipeline based on the return oil tank level limit, the target pressure value, the pressure build-up replenishment oil level, the measured return oil tank level, the measured pressure tank level, and the measured pressure value of the pressure tank includes: If the measured oil level in the return oil tank does not exceed the lower limit of the return oil tank level, the oil supply valve of the return oil tank is opened and the oil pump stops working. If the measured oil level in the return oil tank reaches the upper limit of the return oil tank level, the oil supply valve of the return oil tank is closed and the oil pump starts working. When the measured oil level in the pressure oil tank reaches the pressure build-up gas replenishment oil level, the comparison between the measured oil level in the return oil tank and the oil level limit of the return oil tank is stopped, and the oil supply valve of the return oil tank is closed and the oil pump stops working. When the measured oil level in the pressure tank reaches the pressure build-up air replenishment level, the air replenishment valve of the oil tank is opened to replenish air to the pressure tank until the measured pressure value of the pressure tank reaches the pressure build-up target value. Then, the air replenishment valve of the oil tank is closed, and the oil supply valve of the oil tank is opened to add oil to the hydraulic pipeline. The calculation of total oil consumption based on the measured oil level in the return oil tank, the measured oil level in the pressure oil tank, and the oil consumption in the hydraulic pipeline includes: The oil volume in the return oil tank is calculated based on the measured oil level in the return oil tank; the oil volume in the pressure oil tank is calculated based on the measured oil level in the pressure oil tank; and the total oil consumption is calculated based on the oil volume in the return oil tank, the oil volume in the pressure oil tank, and the oil consumption in the hydraulic pipeline. The method of controlling the operating state of the valve-pump assembly based on the measured oil level in the return oil tank, the measured oil level in the pressure oil tank, the total oil consumption, the oil level limit in the return oil tank, the upper limit of the oil level in the pressure oil tank, and the total oil consumption limit, to replenish oil to the return oil tank and the pressure oil tank until the measured oil level in the pressure oil tank reaches the pressure build-up and gas replenishment oil level, includes: Based on the measured oil level in the return oil tank, the measured oil level in the pressure oil tank, the total oil consumption, the oil level limit in the return oil tank, the upper limit of the oil level in the pressure oil tank, and the total oil consumption limit, the oil replenishment demand in the return oil tank is determined. If oil replenishment is required, the oil supply valve in the return oil tank is opened and the oil pump stops working. If oil replenishment is not required, the oil supply valve in the return oil tank is closed and the oil pump works to replenish the pressure oil tank. When the measured oil level in the pressure oil tank reaches the pressure build-up and gas replenishment oil level, the oil replenishment demand determination in the return oil tank is stopped, and the oil supply valve in the return oil tank is closed and the oil pump stops working. The total oil consumption limit includes an upper limit and a lower limit. The measured oil level in the return tank includes a first analog level signal and a first digital level signal. The measured oil level in the pressure tank includes a second analog level signal and a second digital level signal. The determination of return tank replenishment needs based on the measured oil level in the return tank, the measured oil level in the pressure tank, the total oil consumption, the return tank oil level limit, the upper limit of the pressure tank oil level, and the total oil consumption limit includes: When the analog quantity of the first liquid level signal does not exceed the analog quantity of the lower limit of the return oil tank level and the switch quantity of the first liquid level signal does not exceed the switch quantity of the lower limit of the return oil tank level, or when the total oil consumption is lower than the lower limit of the total oil consumption, the return oil tank needs to be replenished. If at least one of the following conditions is met: the analog quantity of the first liquid level signal reaches the upper limit of the return oil tank level, the switch quantity of the first liquid level signal reaches the upper limit of the return oil tank level, the total oil consumption reaches the upper limit of the total oil consumption, the analog quantity of the second liquid level signal reaches the upper limit of the pressure oil tank level, or the switch quantity of the second liquid level signal reaches the upper limit of the pressure oil tank level, then the return oil tank does not need to be replenished.

2. An automatic pressure control system for a speed governor hydraulic device, characterized in that, The speed governor hydraulic device includes a return oil tank, a pressure oil tank, a valve pump assembly, and hydraulic pipelines. The valve pump assembly includes a return oil tank supply valve, an oil pump, an oil tank supply valve, and an oil tank air supply valve. The return oil tank is connected to the clean oil tank of the turbine oil system via the return oil tank supply valve. The return oil tank is connected to the pressure oil tank via the oil pump. The pressure oil tank is connected to the hydraulic pipelines via the oil tank supply valve. The pressure oil tank is connected to the medium-pressure air system via the oil tank air supply valve. The automatic pressure control system includes: The acquisition module includes a first oil level measuring unit arranged on the return oil tank, a second oil level measuring unit arranged on the pressure oil tank, and a pressure sensor. The first oil level measuring unit is used to obtain the measured oil level in the return oil tank, the second oil level measuring unit is used to obtain the measured oil level in the pressure oil tank, and the pressure sensor is used to obtain the measured pressure value in the pressure oil tank. The acquisition module is also used to set the pressure build-up target value, pressure build-up replenishment oil level, rated oil pressure, and medium-pressure air system pressure threshold after the governor oil pressure device has been overhauled. The first control module is used to obtain the return oil tank level limit, the pressure tank level limit, and the total oil consumption limit when it receives a command to enter the pressure building condition. Based on the return oil tank level limit, the pressure building target value, the pressure building air supply level, the measured return oil tank level, the measured pressure tank level, and the measured pressure tank pressure, the module controls the working state of the valve pump assembly to add oil to the hydraulic pipeline. The calculation module is used to obtain the amount of oil used in the hydraulic pipeline after the oil filling is completed. The second control module is used to update the target pressure value for pressure buildup, calculate the total oil consumption based on the measured oil level in the return oil tank, the measured oil level in the pressure oil tank, and the oil consumption in the hydraulic pipeline, and control the working state of the valve-pump assembly based on the measured oil level in the return oil tank, the measured oil level in the pressure oil tank, the total oil consumption, the oil level limit in the return oil tank, the upper limit of the oil level in the pressure oil tank, and the total oil consumption limit, so as to replenish oil to the return oil tank and the pressure oil tank until the measured oil level in the pressure oil tank reaches the pressure buildup air replenishment oil level; when the measured oil level in the pressure oil tank reaches the pressure buildup air replenishment oil level, control the oil tank air replenishment valve to open. To replenish the pressure tank, if the measured pressure of the medium-pressure gas system is lower than the medium-pressure gas system pressure threshold during the replenishment process, the replenishment valve of the oil tank is closed and the medium-pressure gas system is filled with air using an air compressor until the measured pressure of the medium-pressure gas system is higher than the medium-pressure gas system pressure threshold. Then the replenishment valve of the oil tank is opened. If the measured pressure of the pressure tank reaches the updated pressure build-up target value during the replenishment process, the pressure build-up target value is updated again and the replenishment continues until the updated pressure build-up target value is the rated oil pressure. If the measured pressure of the pressure tank reaches the rated oil pressure, the automatic pressure build-up is completed. The return oil tank level limit includes an upper limit and a lower limit. The step of controlling the operating state of the valve-pump assembly to add oil to the hydraulic pipeline based on the return oil tank level limit, the target pressure value, the pressure build-up replenishment oil level, the measured return oil tank level, the measured pressure tank level, and the measured pressure value of the pressure tank includes: If the measured oil level in the return oil tank does not exceed the lower limit of the return oil tank level, the oil supply valve of the return oil tank is opened and the oil pump stops working. If the measured oil level in the return oil tank reaches the upper limit of the return oil tank level, the oil supply valve of the return oil tank is closed and the oil pump starts working. When the measured oil level in the pressure oil tank reaches the pressure build-up gas replenishment oil level, the comparison between the measured oil level in the return oil tank and the oil level limit of the return oil tank is stopped, and the oil supply valve of the return oil tank is closed and the oil pump stops working. When the measured oil level in the pressure tank reaches the pressure build-up air replenishment level, the air replenishment valve of the oil tank is opened to replenish air to the pressure tank until the measured pressure value of the pressure tank reaches the pressure build-up target value. Then, the air replenishment valve of the oil tank is closed, and the oil supply valve of the oil tank is opened to add oil to the hydraulic pipeline. The calculation of total oil consumption based on the measured oil level in the return oil tank, the measured oil level in the pressure oil tank, and the oil consumption in the hydraulic pipeline includes: The oil volume in the return oil tank is calculated based on the measured oil level in the return oil tank; the oil volume in the pressure oil tank is calculated based on the measured oil level in the pressure oil tank; and the total oil consumption is calculated based on the oil volume in the return oil tank, the oil volume in the pressure oil tank, and the oil consumption in the hydraulic pipeline. The method of controlling the operating state of the valve-pump assembly based on the measured oil level in the return oil tank, the measured oil level in the pressure oil tank, the total oil consumption, the oil level limit in the return oil tank, the upper limit of the oil level in the pressure oil tank, and the total oil consumption limit, to replenish oil to the return oil tank and the pressure oil tank until the measured oil level in the pressure oil tank reaches the pressure build-up and gas replenishment oil level, includes: Based on the measured oil level in the return oil tank, the measured oil level in the pressure oil tank, the total oil consumption, the oil level limit in the return oil tank, the upper limit of the oil level in the pressure oil tank, and the total oil consumption limit, the oil replenishment demand in the return oil tank is determined. If oil replenishment is required, the oil supply valve in the return oil tank is opened and the oil pump stops working. If oil replenishment is not required, the oil supply valve in the return oil tank is closed and the oil pump works to replenish the pressure oil tank. When the measured oil level in the pressure oil tank reaches the pressure build-up and gas replenishment oil level, the oil replenishment demand determination in the return oil tank is stopped, and the oil supply valve in the return oil tank is closed and the oil pump stops working. The total oil consumption limit includes an upper limit and a lower limit. The measured oil level in the return tank includes a first analog level signal and a first digital level signal. The measured oil level in the pressure tank includes a second analog level signal and a second digital level signal. The determination of return tank replenishment needs based on the measured oil level in the return tank, the measured oil level in the pressure tank, the total oil consumption, the return tank oil level limit, the upper limit of the pressure tank oil level, and the total oil consumption limit includes: When the analog quantity of the first liquid level signal does not exceed the analog quantity of the lower limit of the return oil tank level and the switch quantity of the first liquid level signal does not exceed the switch quantity of the lower limit of the return oil tank level, or when the total oil consumption is lower than the lower limit of the total oil consumption, the return oil tank needs to be replenished. If at least one of the following conditions is met: the analog quantity of the first liquid level signal reaches the upper limit of the return oil tank level, the switch quantity of the first liquid level signal reaches the upper limit of the return oil tank level, the total oil consumption reaches the upper limit of the total oil consumption, the analog quantity of the second liquid level signal reaches the upper limit of the pressure oil tank level, or the switch quantity of the second liquid level signal reaches the upper limit of the pressure oil tank level, then the return oil tank does not need to be replenished.

3. An automatic pressure control device for a speed governor hydraulic unit, characterized in that, include: At least one processor; The system also includes a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the automatic pressure control method for the governor hydraulic device as described in claim 1.

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