Hydraulic power generation system, control method, device, storage medium, and program product

Abstract

The invention provides a hydraulic power generation system, a control method, a device, a storage medium and a program product. The hydraulic power generation system comprises an oil tank, a variable displacement piston pump, a control valve set, a hydraulic generator, a voltage collecting device and a control device, the control valve set comprises an electric proportional flow valve, the oil tank, the variable displacement piston pump, the electric proportional flow valve and the hydraulic generator are connected through pipelines, and the voltage collecting device is electrically connected with the hydraulic generator. The voltage acquisition device is electrically connected with the control device; the voltage acquisition device is configured to acquire an alternating voltage output by the hydraulic generator, obtain an effective voltage value of the alternating voltage as an actual voltage, and transmit the actual voltage to the control device; the control device is configured to calculate the difference value between the actual voltage and the target voltage, and when the difference value is not zero, a control signal is output to the electric proportional flow valve so as to adjust the size of an opening of the electric proportional flow valve.

Description

Technical Field

[0001] The present disclosure relates to the technical field of engineering machinery, and in particular to a hydraulic power generation system, a control method, a device, a storage medium and a program product. Background Art

[0002] Mobile lifting work platform is a commonly used aerial work equipment, which has the advantages of flexible movement, safe and convenient operation, etc. At present, outdoor construction site welding is mainly powered by diesel generator sets on integrated welding vehicles, but the speed of existing domestic generator sets is greatly affected by load changes, and the speed adjustment time is too long, which often leads to defects during welding and affects work efficiency.

[0003] As users have higher and higher requirements for the convenience of electricity use, the demand for mobile lifting work platform vehicle-mounted hydraulic generators has gradually become prominent. Vehicle-mounted hydraulic generators have the advantages of small size, high power-to-weight ratio, and low noise, and are widely used in the construction industry and other fields. In related technologies, the output voltage stability of hydraulic generators is poor. Summary of the invention

[0004] A technical problem solved by the present disclosure is that in the related art, the stability of the output voltage of the hydraulic generator is poor.

[0005] According to one aspect of the present disclosure, a hydraulic power generation system is provided, comprising: an oil tank, a variable piston pump, a control valve group, a hydraulic generator, a voltage acquisition device and a control device, wherein the control valve group comprises an electric proportional flow valve, the oil tank, the variable piston pump, the electric proportional flow valve and the hydraulic generator are connected via a pipeline, the voltage acquisition device is electrically connected to the hydraulic generator, and the voltage acquisition device is electrically connected to the control device; the voltage acquisition device is configured to acquire the AC voltage output by the hydraulic generator, obtain the effective voltage value of the AC voltage as the actual voltage, and transmit the actual voltage to the control device; the control device is configured to calculate the difference between the actual voltage and the target voltage, and when the difference is not zero, output a control signal to the electric proportional flow valve to adjust the size of the opening of the electric proportional flow valve.

[0006] In some embodiments, the control signal is a current signal; the control device is configured to reduce the current signal to reduce the opening of the electric proportional flow valve when the difference is greater than zero, and to increase the current signal to increase the opening of the electric proportional flow valve when the difference is less than zero.

[0007] In some embodiments, the control device is configured to gradually adjust the magnitude of the current signal based on a first current change when the absolute value of the difference is greater than or equal to a threshold, and to gradually adjust the magnitude of the current signal based on a second current change when the absolute value of the difference is less than the threshold, wherein the first current change is greater than the second current change.

[0008] In some embodiments, the first current variation ranges from 10 mA to 20 mA; and the second current variation ranges from 5 mA to 10 mA.

[0009] In some embodiments, the threshold is 0.1 times the target voltage.

[0010] In some embodiments, the hydraulic generator includes: a hydraulic motor and a generator, wherein the drive shaft of the hydraulic motor is coaxially connected to the rotor of the generator through a coupling, and the hydraulic motor is connected to the control valve group through a first oil inlet line and a first oil return line, wherein the first oil inlet line is connected to the variable piston pump, and the first oil return line is connected to the oil tank; the electric proportional flow valve is arranged on the first oil inlet line.

[0011] In some embodiments, the control valve group also includes: a relief valve, arranged on the pipeline between the first oil inlet pipeline and the first oil return pipeline; and a one-way valve, connected to the first oil inlet pipeline through a pipeline and connected to the variable piston pump through a first feedback loop.

[0012] In some embodiments, the hydraulic power generation system also includes: a turntable main valve, the turntable main valve is connected to the variable piston pump through a second oil inlet pipeline and a second feedback loop, the turntable main valve is connected to the oil tank through a second oil return pipeline, the turntable main valve includes a main control valve and a plurality of main valve spools, the main control valve is connected to the second oil inlet pipeline, the second feedback loop and the second oil return pipeline, the plurality of main valve spools are connected to the second oil inlet pipeline, the second feedback loop and the cylinder, and the cylinder is connected to the second oil return pipeline; and a flushing valve connected between the second oil inlet pipeline and the oil tank.

[0013] In some embodiments, the control device is further configured to control the main control valve and the flushing valve to be cut off, and control the plurality of main valve spools to be cut off during the process of starting the hydraulic engine.

[0014] In some embodiments, the control device is also configured to control the main control valve and the flushing valve to be turned on, control the corresponding main valve cores among the multiple main valve cores to be turned on, and control the electric proportional flow valve to be turned off during the process of controlling the operation of the cylinder.

[0015] In some embodiments, the hydraulic power generation system also includes: a pressure sensor configured to collect the pressure in the first feedback loop or the second feedback loop and transmit the pressure to the control device; wherein the control device is also configured to transmit the pressure to a display device to display the pressure.

[0016] According to another aspect of the present disclosure, a control method is provided, which is a control device for a hydraulic power generation system, wherein the hydraulic power generation system includes an oil tank, a variable piston pump, a control valve group, a hydraulic generator, a voltage acquisition device and the control device, wherein the control valve group includes an electric proportional flow valve, the oil tank, the variable piston pump, the electric proportional flow valve and the hydraulic generator are connected by a pipeline, the voltage acquisition device is electrically connected to the hydraulic generator, the voltage acquisition device is electrically connected to the control device, and the voltage acquisition device is configured to acquire the AC voltage output by the hydraulic generator, obtain the effective voltage value of the AC voltage as the actual voltage, and transmit the actual voltage to the control device; the control method includes: calculating the difference between the actual voltage and the target voltage; and when the difference is not zero, outputting a control signal to the electric proportional flow valve to adjust the size of the opening of the electric proportional flow valve.

[0017] In some embodiments, the control signal is a current signal; when the difference is not zero, a control signal is output to the electric proportional flow valve to adjust the size of the opening of the electric proportional flow valve, including: when the difference is greater than zero, reducing the current signal to reduce the opening of the electric proportional flow valve; and when the difference is less than zero, increasing the current signal to increase the opening of the electric proportional flow valve.

[0018] In some embodiments, when the difference is not zero, a control signal is output to the electric proportional flow valve to adjust the size of the opening of the electric proportional flow valve, including: when the absolute value of the difference is greater than or equal to a threshold, gradually adjusting the size of the current signal based on a first current change; and when the absolute value of the difference is less than the threshold, gradually adjusting the size of the current signal based on a second current change, wherein the first current change is greater than the second current change.

[0019] In some embodiments, the hydraulic generator includes: a hydraulic motor and a generator, wherein the driving shaft of the hydraulic motor is coaxially connected to the rotor of the generator through a coupling, and the hydraulic motor is connected to the control valve group through a first oil inlet pipeline and a first oil return pipeline, wherein the first oil inlet pipeline is connected to the variable piston pump, the first oil return pipeline is connected to the oil tank, and the electric proportional flow valve is arranged on the first oil inlet pipeline; the control valve group also includes: a relief valve, which is arranged on the pipeline between the first oil inlet pipeline and the first oil return pipeline; and a one-way valve, which is connected to the first oil inlet pipeline through a pipeline and connected to the variable piston pump through a first feedback loop; the hydraulic power generation system also includes: a rotor The turntable main valve is connected to the variable piston pump through a second oil inlet pipeline and a second feedback loop, the turntable main valve is connected to the oil tank through a second oil return pipeline, the turntable main valve includes a main control valve and a plurality of main valve spools, the main control valve is connected to the second oil inlet pipeline, the second feedback loop and the second oil return pipeline, the plurality of main valve spools are connected to the second oil inlet pipeline, the second feedback loop and the oil cylinder, the oil cylinder is connected to the second oil return pipeline; and a flushing valve is connected between the second oil inlet pipeline and the oil tank; the control method also includes: in the process of starting the hydraulic engine, controlling the main control valve and the flushing valve to be cut off, and controlling the plurality of main valve spools to be cut off.

[0020] In some embodiments, the control method further includes: in the process of controlling the operation of the oil cylinder, controlling the main control valve and the flushing valve to be turned on, controlling the corresponding main valve cores among the multiple main valve cores to be turned on, and controlling the electric proportional flow valve to be turned off.

[0021] In some embodiments, the control method further includes: receiving pressure in the first feedback loop or the second feedback loop; and transmitting the pressure to a display device to display the pressure.

[0022] According to another aspect of the present disclosure, a control device is provided, comprising: a memory; and a processor coupled to the memory, wherein the processor is configured to execute the control method as described above based on instructions stored in the memory.

[0023] According to another aspect of the present disclosure, a computer-readable storage medium is provided, on which computer instructions are stored. When the computer instructions are executed by a processor, the control method as described above is implemented.

[0024] According to another aspect of the present disclosure, a computer program product is provided. The computer program product includes a computer program or instructions. When the computer program or instructions are executed by a processor, the control method as described above is implemented.

[0025] In the above-mentioned hydraulic power generation system, the size of the opening of the electric proportional flow valve is adjusted based on the difference between the actual voltage and the target voltage, so that the flow of the hydraulic oil in the pipeline can be adjusted, and then the actual voltage output by the hydraulic generator can be adjusted, so that the actual output voltage is kept consistent with the target voltage as much as possible, thereby improving the stability of the output voltage of the hydraulic generator.

[0026] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0028] The present disclosure may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0029] Figure 1 is a schematic diagram showing the structure of a hydraulic power generation system in the related art;

[0030] Figure 2 is a schematic diagram showing the structure of a hydraulic power generation system according to some embodiments of the present disclosure;

[0031] Figure 3 is a schematic structural diagram showing a hydraulic power generation system according to other embodiments of the present disclosure;

[0032] Figure 4 is a schematic structural diagram showing a hydraulic power generation system according to other embodiments of the present disclosure;

[0033] Figure 5 is a schematic diagram showing a voltage stabilizing closed-loop control principle of a hydraulic power generation system according to some embodiments of the present disclosure;

[0034] Figure 6 is a flow chart showing a control method according to some embodiments of the present disclosure;

[0035] Figure 7 is a flow chart showing a control method according to other embodiments of the present disclosure;

[0036] Figure 8 is a block diagram schematically showing a structure of a control device according to some embodiments of the present disclosure;

[0037] Fig. 9 is a block diagram schematically showing a structure of a control device according to some other embodiments of the present disclosure. DETAILED DESCRIPTION

[0038] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure unless otherwise specifically stated.

[0039] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0040] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0041] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0042] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0043] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0044] Figure 1 Schematic diagram showing the structure of a hydraulic power generation system in the related art.

[0045] like Figure 1 As shown, in the related art, the hydraulic power generation system includes a hydraulic source, a throttling device, a hydraulic motor, a generator, a cooler and an oil tank, etc. For example, the hydraulic power generation system uses a fixed displacement pump (e.g., a gear pump) as a hydraulic source to provide an oil source, and a throttle valve (as a throttling device) is used to adjust the pump displacement. The hydraulic motor can be directly integrated and fixed on the generator housing through a connecting device, one end of the connecting device is fixed on the generator, and the other end of the connecting device is connected to the hydraulic motor. The driving shaft of the hydraulic motor and the rotor of the generator are coaxially connected through a coupling to form a generator set module, and the drive of the hydraulic motor and the power generation of the generator are integrated into a power generation unit.

[0046] In the related technology, the current hydraulic generator system is greatly affected by the hydraulic oil temperature and load. When the oil temperature rises, the viscosity of the hydraulic oil decreases with increasing temperature, which is an inherent physical property of the hydraulic oil. The change in oil temperature causes the power generation flow to increase, which easily causes the output voltage of the hydraulic generator to change.

[0047] In addition, in the case of a sudden load change, if the user connects an electric tool such as a hot hair dryer, the pressure difference before and after the hydraulic generator control valve decreases at the moment the electric tool is connected, resulting in a decrease in the opening of the hydraulic generator control valve, a decrease in the flow through the motor, and a rapid decrease in the output voltage; or at the moment the power of the electric tool is cut off, the pressure difference before and after the hydraulic generator control valve increases, resulting in an increase in the opening of the hydraulic generator control valve, an increase in the flow through the motor, and a surge in the output voltage. Therefore, in the related art, the stability of the output voltage of the hydraulic generator is poor. These working conditions may cause damage to the user's electrical appliances and affect the user's comfort level with the hydraulic generator.

[0048] In view of this, an embodiment of the present disclosure provides a hydraulic power generation system to improve the stability of the output voltage of the hydraulic generator.

[0049] Figure 2 is a schematic diagram showing the structure of a hydraulic power generation system according to some embodiments of the present disclosure.

[0050] like Figure 2 As shown, the hydraulic power generation system includes: an oil tank 8, a variable piston pump 1, a control valve group 2, a hydraulic generator 3, a voltage acquisition device 4 and a control device 9. For example, the control device may include a controller, etc. The control valve group 2 includes an electric proportional flow valve 21. The oil tank 8, the variable piston pump 1, the electric proportional flow valve 21 and the hydraulic generator 3 are connected through a pipeline. The voltage acquisition device 4 is electrically connected to the hydraulic generator 3, and the voltage acquisition device 4 is electrically connected to the control device 9.

[0051] Here, the hydraulic generator includes: a hydraulic motor and a generator, wherein a driving shaft of the hydraulic motor and a rotor of the generator are coaxially connected via a coupling.

[0052] The voltage acquisition device 4 is configured to acquire the AC voltage output by the hydraulic generator, obtain the effective voltage value of the AC voltage as the actual voltage, and transmit the actual voltage to the control device 9. For example, the voltage acquisition device can adopt a known voltage acquisition device.

[0053] The control device 9 is configured to calculate the difference between the actual voltage and the target voltage, and when the difference is not zero, output a control signal (which may be referred to as a first control signal) to the electric proportional flow valve to adjust the size of the opening of the electric proportional flow valve (i.e., the opening degree of the electric proportional flow valve). Here, the difference = actual voltage - target voltage.

[0054] For example, the target voltage can be input into the control device in advance. When the difference between the actual voltage and the target voltage is not zero, the control device outputs a control signal to the electric proportional flow valve to adjust the size of the opening of the electric proportional flow valve. In this way, the flow of hydraulic oil flowing through the hydraulic motor of the hydraulic generator can be adjusted, and then the actual voltage output by the hydraulic generator can be adjusted so that the actual output voltage is kept consistent with the target voltage as much as possible, thereby improving the stability of the output voltage of the hydraulic generator.

[0055] So far, a hydraulic power generation system according to some embodiments of the present disclosure is provided. The hydraulic power generation system includes: an oil tank, a variable piston pump, a control valve group, a hydraulic generator, a voltage acquisition device and a control device. The voltage acquisition device is configured to acquire the AC voltage output by the hydraulic generator, obtain the effective voltage value of the AC voltage as the actual voltage, and transmit the actual voltage to the control device; the control device is configured to calculate the difference between the actual voltage and the target voltage, and when the difference is not zero, output a control signal to the electric proportional flow valve to adjust the size of the opening of the electric proportional flow valve. In the hydraulic power generation system, based on the difference between the actual voltage and the target voltage, the size of the opening of the electric proportional flow valve is adjusted, so that the flow of hydraulic oil in the pipeline can be adjusted, and then the actual voltage output by the hydraulic generator is adjusted, so that the actual voltage output is kept consistent with the target voltage as much as possible, thereby improving the stability of the output voltage of the hydraulic generator.

[0056] In some embodiments, the control signal is a current signal. The control device is configured to reduce the current signal to reduce the opening of the electric proportional flow valve when the difference (i.e., the difference between the actual voltage and the target voltage) is greater than zero, and increase the current signal to increase the opening of the electric proportional flow valve when the difference is less than zero.

[0057] In this embodiment, when the difference between the actual voltage and the target voltage is greater than zero, it indicates that the actual voltage is greater than the target voltage. The control device can reduce the opening of the electric proportional flow valve by reducing the current signal, thereby reducing the flow of hydraulic oil in the hydraulic motor of the hydraulic generator, thereby reducing the actual voltage output by the hydraulic generator; when the difference between the actual voltage and the target voltage is less than zero, it indicates that the actual voltage is less than the target voltage. The control device can increase the opening of the electric proportional flow valve by increasing the current signal, thereby increasing the flow of hydraulic oil in the hydraulic motor of the hydraulic generator, thereby increasing the actual voltage output by the hydraulic generator. In this way, the actual voltage output by the hydraulic generator can be adjusted to be consistent with the target voltage as much as possible, thereby improving the stability of the output voltage of the hydraulic generator.

[0058] In some embodiments, the control device is configured to gradually adjust the magnitude of the current signal based on a first current change when the absolute value of the above-mentioned difference is greater than or equal to a threshold value, and to gradually adjust the magnitude of the current signal based on a second current change when the absolute value of the above-mentioned difference is less than the threshold value, wherein the first current change is greater than the second current change.

[0059] In this embodiment, in order to prevent the adjustment range from being too large, the above judgment control logic is used for adjustment, that is, first determine whether the absolute value of the above difference is greater than or equal to the threshold value (here, the threshold value is a positive value). If so, perform coarse adjustment with a large step current change (i.e., the first current change) until the absolute value of the above difference does not exceed the threshold value, and then perform fine adjustment with a small step current change (i.e., the second current change) to ensure the accuracy of automatic voltage adjustment. In this way, the speed of voltage adjustment can be improved, and the accuracy of automatic voltage adjustment can be ensured as much as possible.

[0060] For example, when the difference between the actual voltage and the target voltage is greater than zero, if the difference is greater than or equal to a threshold value, the control device gradually reduces the size of the current signal based on the first current change to reduce the opening of the electric proportional flow valve in larger steps; if the above difference is less than the threshold value, the control device gradually reduces the size of the current signal based on the second current change to reduce the opening of the electric proportional flow valve in smaller steps.

[0061] For another example, when the difference between the actual voltage and the target voltage is less than zero, if the absolute value of the difference is greater than or equal to a threshold value, the control device gradually increases the size of the current signal based on the first current change to increase the opening of the electric proportional flow valve in larger steps; if the absolute value of the above difference is less than the threshold value, then based on the second current change, the control device gradually increases the size of the current signal to increase the opening of the electric proportional flow valve in smaller steps.

[0062] In some embodiments, the range of the first current change is 10 mA to 20 mA; the range of the second current change is 5 mA to 10 mA. Of course, the ranges of the first current change and the second current change are exemplary, and the scope of the present disclosure is not limited thereto. For example, the specific values ​​of the first current change and the second current change can be set according to actual needs.

[0063] In some embodiments, the threshold is 0.1 times the target voltage. Of course, the threshold is only exemplary, and the scope of the present disclosure is not limited to the specific value of the threshold. For example, the specific value of the threshold can be set according to actual needs.

[0064] In some cases, a fluctuation range of 10% (0.1 times the target voltage) above or below the target voltage of the hydraulic generator is acceptable to the electrical consumers.

[0065] Figure 3 Schematic diagram showing the structure of a hydraulic power generation system according to other embodiments of the present disclosure.

[0066] like Figure 3 As shown, the hydraulic power generation system includes: an oil tank 8, a variable piston pump 1, a control valve group 2, a hydraulic generator 3 and a voltage acquisition device 4. The control valve group 2 includes an electric proportional flow valve 21. The oil tank 8, the variable piston pump 1, the electric proportional flow valve 21 and the hydraulic generator 3 are connected through pipelines. The voltage acquisition device 4 is electrically connected to the hydraulic generator 3, and the voltage acquisition device 4 is also connected to the control device ( Figure 3 ) electrical connections.

[0067] The variable piston pump 1 serves as the main oil source to provide hydraulic oil for the hydraulic power generation system.

[0068] The control valve group 2 is a control element of the hydraulic power generation system. The control device can send different current signals to the electric proportional flow valve 21 to make the opening of the electric proportional flow valve different, and the flow rate of hydraulic oil input into the hydraulic motor through the electric proportional flow valve is different, thereby adjusting the speed of the hydraulic generator.

[0069] The control valve group 2 includes not only the electric proportional flow valve (e.g., the electric proportional flow valve with compensator) 21, but also a relief valve (which may be called the first relief valve, i.e., the overload oil replenishment valve) 22 and a check valve 23. The relief valve 22 is arranged on the pipeline between the first oil inlet pipeline and the first oil return pipeline. Figure 3 The oil inlet P1 of the first oil inlet pipeline and the oil return port T1 of the first oil return pipeline are shown in FIG. The overflow valve 22 can return oil from the oil return line to protect the entire circuit when the load pressure exceeds the overflow pressure. The one-way valve 23 is connected to the first oil inlet pipeline through a pipeline and is connected to the variable piston pump through the first feedback loop. Figure 3 The feedback oil port LS1 of the first feedback loop is shown in FIG. The one-way valve 23 is used for the first feedback loop, and the load pressure of the motor of the hydraulic generator is transmitted to the variable piston pump 1 in the forward direction through the one-way valve, thereby adjusting the inclination angle of the swash plate of the variable piston pump, thereby adjusting the displacement of the variable piston pump, and further adjusting the output flow of the variable piston pump.

[0070] The hydraulic generator 3 includes a hydraulic motor and a generator. The driving shaft of the hydraulic motor is coaxially connected to the rotor of the generator through a coupling. The hydraulic motor is connected to the control valve group through a first oil inlet pipeline and a first oil return pipeline, wherein the first oil inlet pipeline is connected to the variable piston pump 1, and the first oil return pipeline is connected to the oil tank 8. Port A of the hydraulic motor is connected to the first oil inlet pipeline, and port B of the hydraulic motor is connected to the first oil return pipeline. The electric proportional flow valve 21 is arranged on the first oil inlet pipeline. The hydraulic generator 3 is an actuator, which generates electricity by cutting the magnetic flux lines through its internal hydraulic motor.

[0071] The voltage acquisition device 4 acquires the actual voltage output by the hydraulic generator in real time and feeds it back to the control device.

[0072] like Figure 3 As shown, the hydraulic power generation system may further include a turntable main valve 6. The turntable main valve 6 is connected to the variable piston pump 1 through a second oil inlet pipeline and a second feedback loop. Figure 3 The oil inlet P2 of the second oil inlet pipeline and the feedback oil port LS2 of the second feedback loop are shown in FIG. The turntable main valve 6 is connected to the oil tank 8 through the second oil return pipeline. Figure 3 The oil return port T2 of the second oil return pipeline is shown in the figure. The turntable main valve includes a main control valve Y2 and a plurality of main valve spools (for example, main valve spools Y3b, Y3a, Y4b, Y4a, Y5b and Y5a), and the main control valve Y2 is connected to the second oil inlet pipeline, the second feedback loop and the second oil return pipeline. The plurality of main valve spools are connected to the second oil inlet pipeline, the second feedback loop and the cylinder (for example, the boom hydraulic cylinder) 10. The cylinder 10 is connected to the second oil return pipeline. The cylinder 10 includes two working ports AX and BX. The cylinder can perform actions, for example, all boom actions of the aerial work platform, including but not limited to main boom amplitude change, main boom extension and retraction, second boom amplitude change, etc.

[0073] like Figure 3 As shown, the hydraulic power generation system may further include a flushing valve 7 connected between the second oil inlet pipeline and the oil tank. For example, the flushing valve 7 is a normally open valve. Figure 3 Another oil inlet P3 is also shown.

[0074] For example, Figure 3 As shown, the turntable main valve 6 may further include a second overflow valve 61 and a third overflow valve 62. The second overflow valve 61 is arranged on the second oil inlet pipeline, and the third overflow valve 62 is arranged on the second feedback loop.

[0075] The second relief valve 61 can prevent the system pressure from being too high and damaging the components. For example, when the pressure exceeds 250 bar, the high-pressure oil will return to the oil return line through the second relief valve, thereby reducing the pressure. The second relief valve 61 can cooperate with the hydraulic generator in the system to form a complete control loop.

[0076] In some embodiments, the control device is further configured to control the main control valve and the flushing valve to be cut off, and control the plurality of main valve spools to be cut off during the process of starting the hydraulic engine.

[0077] For example, in the process of starting the hydraulic engine, the control device outputs the second control signal to the main control valve and the third control signal to the flushing valve, so that the main control valve and the flushing valve are both turned off, and does not output an electrical signal to the multiple main valve cores, so that the multiple main valve cores are all turned off. At this time, the electric proportional flow valve is turned on.

[0078] In the above embodiment, the main control valve Y2 is located inside the turntable main valve 6. Since the hydraulic power generation system takes oil from the oil inlet P2 of the turntable main valve, the hydraulic power generation system builds pressure by energizing the main control valve Y2; the flushing valve 7 is energized to cut off the hydraulic oil at the oil inlet P2 of the turntable main valve, so that the pressure oil is only provided to the hydraulic power generation system; and multiple main valve spools (for example, main valve spools Y3b, Y3a, Y4b, Y4a, Y5b and Y5a) lose power. In addition, at this time, the electric proportional flow valve is turned on. In this way, in the process of starting the hydraulic engine, the impact of insufficient power of other actions (for example, engine overload and flameout) or other actions on the hydraulic generator system can be reduced, preventing the problem of unstable output voltage of the hydraulic generator.

[0079] In other embodiments, the control device is further configured to control the main control valve and the flushing valve to be turned on, control the corresponding main valve cores among multiple main valve cores to be turned on, and control the electric proportional flow valve to be turned off during the process of controlling the operation of the oil cylinder.

[0080] In the above embodiment, in the process of controlling the operation of the oil cylinder, by controlling the main control valve and the flushing valve to be turned on, and controlling the corresponding main valve cores of the multiple main valve cores to be turned on, it is possible to provide hydraulic pressure to the oil cylinder. By controlling the electric proportional flow valve to be cut off, the operation of the hydraulic engine can be stopped, so that all the hydraulic pressure is provided to the oil cylinder. In this way, the operation of the oil cylinder can be facilitated to enable the boom to perform actions.

[0081] Therefore, through the above control logic, the interlocking of the hydraulic generator system and the equipment execution action can be achieved.

[0082] like Figure 3 As shown, the hydraulic power generation system may further include a pressure sensor 5. The pressure sensor 5 is configured to collect the pressure in the first feedback loop or the second feedback loop and transmit the pressure to the control device. In this way, the pressure sensor 5 collects the pressure in the feedback loop of the hydraulic power generation system and feeds it back to the control device. Figure 3 As shown, the first feedback loop and the second feedback loop merge together, and the pressure sensor 5 is arranged at the position where the first feedback loop and the second feedback loop merge. Figure 3 In the figure, PL represents the feedback loop.

[0083] The control device may also be configured to transmit the pressure to a display device ( Figure 3 The pressure is displayed in the figure (not shown). In this way, the operator can check the pressure.

[0084] Due to the interlocking of the power generation of the hydraulic generator and the execution of the action of the equipment, only one of the hydraulic generator and the cylinder is running. Therefore, the pressure collected by the pressure sensor is the pressure in the feedback loop of one of the hydraulic generator and the cylinder. Therefore, the control device can know which feedback loop of the first feedback loop and the second feedback loop the pressure received from the pressure sensor is.

[0085] like Figure 3 As shown, the hydraulic power generation system may further include a filter 11. For example, the filter is a high pressure filter. The filter is connected to the variable displacement piston pump 1.

[0086] Figure 4 Schematic diagram showing the structure of a hydraulic power generation system according to other embodiments of the present disclosure.

[0087] like Figure 4 As shown, the hydraulic power generation system includes a hydraulic control system, a hydraulic generator 3, a voltage acquisition device 4, a control device 9, etc. The hydraulic control system includes a variable piston pump 1 and an electric proportional flow valve 21, etc.

[0088] like Figure 4 As shown, the control device can send a control signal to the variable piston pump 1 (eg, the engine M of the variable piston pump 1 ) to control the operation of the variable piston pump 1 in addition to sending a control signal to the electric proportional flow valve 21 .

[0089] In some embodiments, the control device may include an information processing system and a data acquisition system, and the information processing system is mainly used to process the turntable main valve command signal and the flushing valve command signal. Here, the turntable main valve command signal and the flushing valve command signal are instructions sent to the control device through the program by the operator when the operator triggers the button switch of the hydraulic generator when operating the equipment, and then the control device sends a signal instruction to the turntable main valve and the control valve (including the electric proportional flow valve) of the generator. The information processing system can also process the whole vehicle limit movement safety protection requirements, etc. Here, the whole vehicle limit movement safety protection requirements are to limit the movement of the whole vehicle during the power generation process of the hydraulic generator, so as to achieve the interlocking of the hydraulic generator system and the equipment execution action. The data acquisition system can receive pressure sensor signals and voltage detection signals, etc. In this way, the information processing system can judge the pressure sensor signals and voltage detection signals received by the data acquisition system, and control the operation of other devices or units by outputting signals.

[0090] Figure 5 is a schematic diagram illustrating the voltage stabilizing closed-loop control principle of a hydraulic power generation system according to some embodiments of the present disclosure.

[0091] like Figure 5As shown in the figure, the voltage closed-loop regulation process of the hydraulic power generation system is as follows: when the hydraulic generator is running to generate electricity, a given voltage signal (as the target voltage) is transmitted to the control device (for example, a vehicle-mounted controller), and the control device converts the voltage signal into a current signal input to the electric proportional flow valve. The voltage acquisition device installed on the vehicle measures the actual voltage output by the hydraulic generator in real time and transmits it to the control device as a feedback signal. The control device compares the given voltage signal with the actual voltage signal, calculates the difference, and then outputs a control signal again to adjust the opening of the electric proportional flow valve, fine-tune the input flow of the hydraulic generator motor, and thus regulate the output voltage of the hydraulic generator.

[0092] In some embodiments of the present disclosure, the above-mentioned hydraulic power generation system is proposed to address the problem that the hydraulic generator system of a mobile lifting work platform is affected by oil temperature and load, resulting in voltage fluctuations. The actual voltage output by the hydraulic generator is detected and the difference is made with the target voltage (as a calibration value) in the control device. The opening of the electric proportional flow valve of the generator is controlled according to the positive and negative and numerical value of the difference, so that the actual output voltage is consistent with the target voltage, thereby achieving the purpose of stabilizing the output voltage and solving the problem that the output voltage of the hydraulic generator is affected by oil temperature and load size as much as possible.

[0093] The above hydraulic power generation system can adaptively adjust the output voltage of the hydraulic generator according to load changes and oil temperature changes to ensure stable output voltage and frequency of the generator.

[0094] For example, when the rated working flow of the hydraulic generator motor is 230V, the rated working flow is 17L / min (liters / minute). Through the control strategy of the embodiment of the present disclosure, that is, by adjusting the current of the electric proportional flow valve to make the working flow of the generator motor constant, the motor speed is constant, and then the generator rotor speed is constant, so that the output voltage and frequency of the generator can be kept constant. Therefore, the above steady flow control strategy is used to achieve the stable output of the voltage and frequency of the hydraulic generator.

[0095] In addition, the hydraulic power generation system provides a higher level of protection for electrical appliances and the entire vehicle system to avoid mutual interference.

[0096] Figure 6: is a flow chart showing a control method according to some embodiments of the present disclosure. The control method is used for a control device of a hydraulic power generation system. As mentioned above, the hydraulic power generation system includes an oil tank, a variable piston pump, a control valve group, a hydraulic generator, a voltage acquisition device and a control device. The control valve group includes an electric proportional flow valve. The oil tank, the variable piston pump, the electric proportional flow valve and the hydraulic generator are connected by pipelines. The voltage acquisition device is electrically connected to the hydraulic generator. The voltage acquisition device is electrically connected to the control device. The voltage acquisition device is configured to acquire the AC voltage output by the hydraulic generator, obtain the effective voltage value of the AC voltage as the actual voltage, and transmit the actual voltage to the control device. The control method is executed by the control device. Figure 6 As shown, the control method includes steps S602 to S604.

[0097] In step S602 , the difference between the actual voltage and the target voltage is calculated.

[0098] In step S604, when the difference is not zero, a control signal is output to the electric proportional flow valve to adjust the size of the opening of the electric proportional flow valve.

[0099] So far, a control method for a hydraulic power generation system according to some embodiments of the present disclosure is provided. In the control method, based on the difference between the actual voltage and the target voltage, the size of the opening of the electric proportional flow valve is adjusted, so that the flow of the hydraulic oil in the pipeline can be adjusted, and then the actual voltage output by the hydraulic generator is adjusted, so that the actual voltage output is kept consistent with the target voltage as much as possible, thereby improving the stability of the output voltage of the hydraulic generator.

[0100] In some embodiments, the control signal is a current signal. When the difference is not zero, a control signal is output to the electric proportional flow valve to adjust the size of the opening of the electric proportional flow valve, including: when the difference is greater than zero, reducing the current signal to reduce the opening of the electric proportional flow valve; and when the difference is less than zero, increasing the current signal to increase the opening of the electric proportional flow valve.

[0101] In some embodiments, when the difference is not zero, a control signal is output to the electric proportional flow valve to adjust the size of the opening of the electric proportional flow valve, including: when the absolute value of the difference is greater than or equal to a threshold, gradually adjusting the size of the current signal based on a first current change; and when the absolute value of the difference is less than a threshold, gradually adjusting the size of the current signal based on a second current change, wherein the first current change is greater than the second current change.

[0102] In some embodiments, the hydraulic generator includes: a hydraulic motor and a generator, wherein the driving shaft of the hydraulic motor is coaxially connected to the rotor of the generator through a coupling, and the hydraulic motor is connected to the control valve group through a first oil inlet pipeline and a first oil return pipeline, wherein the first oil inlet pipeline is connected to a variable piston pump, the first oil return pipeline is connected to an oil tank, and an electric proportional flow valve is arranged on the first oil inlet pipeline. The control valve group also includes: a relief valve, which is arranged on the pipeline between the first oil inlet pipeline and the first oil return pipeline; and a one-way valve, which is connected to the first oil inlet pipeline through a pipeline and connected to the variable piston pump through a first feedback loop. The hydraulic power generation system also includes: a turntable main valve, the turntable main valve is connected to the variable piston pump through a second oil inlet pipeline and a second feedback loop, the turntable main valve is connected to the oil tank through a second oil return pipeline, the turntable main valve includes a main control valve and a plurality of main valve spools, the main control valve is connected to the second oil inlet pipeline, the second feedback loop and the second oil return pipeline, the plurality of main valve spools are connected to the second oil inlet pipeline, the second feedback loop and the oil cylinder, the oil cylinder is connected to the second oil return pipeline; and a flushing valve, connected between the second oil inlet pipeline and the oil tank.

[0103] In some embodiments, the control method further includes: during the process of starting the hydraulic engine, controlling the main control valve and the flushing valve to be cut off, and controlling the valve cores of the plurality of main valves to be cut off.

[0104] In some embodiments, the control method further includes: in the process of controlling the operation of the oil cylinder, controlling the main control valve and the flushing valve to be turned on, controlling the corresponding main valve cores among the multiple main valve cores to be turned on, and controlling the electric proportional flow valve to be turned off.

[0105] In some embodiments, the control method further includes: receiving pressure in the first feedback loop or the second feedback loop; and transmitting the pressure to a display device to display the pressure.

[0106] Figure 7 FIG. 1 is a flow chart showing a control method according to other embodiments of the present disclosure. Figure 7 As shown, the control method includes steps S701 to S715.

[0107] In step S701, the hydraulic generator operation starts.

[0108] In step S702 , the difference ΔU between the actual voltage U and the target voltage U0 is calculated.

[0109] In step S703, it is determined whether the difference ΔU is greater than or equal to 0. If so, the process proceeds to step S709; otherwise, the process proceeds to step S704.

[0110] In step S704, it is determined whether -ΔU is less than a threshold value. If so, the process proceeds to step S705; otherwise, the process proceeds to step S706.

[0111] In step S705, based on the second current variation, the current signal input to the electric proportional flow valve is increased.

[0112] In step S706, based on the first current variation, the current signal input to the electric proportional flow valve is increased.

[0113] In step S707, it is determined whether the difference ΔU is equal to 0. If so, the process proceeds to step S715; otherwise, the process proceeds to step S708.

[0114] In step S708, it is determined whether the difference ΔU is less than 0. If so, the process returns to step S704; otherwise, the process proceeds to step S710.

[0115] In step S709, it is determined whether ΔU is equal to 0. If so, the process proceeds to step S715; otherwise, the process proceeds to step S710.

[0116] In step S710, it is determined whether ΔU is less than a threshold value. If so, the process proceeds to step S711; otherwise, the process proceeds to step S712.

[0117] In step S711, based on the second current change amount, the current signal input to the electric proportional flow valve is reduced.

[0118] In step S712, based on the first current change, the current signal input to the electric proportional flow valve is reduced.

[0119] In step S713, it is determined whether the difference ΔU is equal to 0. If so, the process proceeds to step S715; otherwise, the process proceeds to step S714.

[0120] In step S714, it is determined whether the difference ΔU is greater than 0. If so, the process returns to step S710; otherwise, the process proceeds to step S704.

[0121] In step S715, the generator outputs the target voltage U0.

[0122] So far, a control method for a hydraulic power generation system according to other embodiments of the present disclosure is provided. In the control method, based on the difference between the actual voltage and the target voltage, the size of the opening of the electric proportional flow valve is adjusted, so that the flow of the hydraulic oil in the pipeline can be adjusted, and then the actual voltage output by the hydraulic generator is adjusted, so that the actual voltage output is kept consistent with the target voltage as much as possible, thereby improving the stability of the output voltage of the hydraulic generator.

[0123] Furthermore, in order to prevent the adjustment range from being too large, it can be determined whether the absolute value of the difference is greater than or equal to the threshold value. If so, a coarse adjustment is performed with a large step current change (i.e., the first current change) until the absolute value of the difference does not exceed the threshold value, and then a fine adjustment is performed with a small step current change (i.e., the second current change) to ensure the accuracy of automatic voltage adjustment. This can not only improve the speed of voltage adjustment, but also ensure the accuracy of automatic voltage adjustment as much as possible.

[0124] In the hydraulic power generation system and its control method, a voltage closed-loop feedback control logic is adopted to achieve stable voltage output; a voltage acquisition device is used to detect the system voltage in real time; an electric proportional flow valve and a control logic combining coarse and fine current adjustments are adopted to achieve precise voltage regulation; an interlocking logic is adopted to assist the power-on and power-off of the main control valve, flushing valve and other actuating solenoid valves, and to interlock and shut down the generator hydraulic system and the entire vehicle action.

[0125] Figure 8 Schematically shows a block diagram of a control device according to some embodiments of the present disclosure. The control device includes a memory 910 and a processor 920. Among them:

[0126] The memory 910 can be a disk, a flash memory, or any other non-volatile storage medium. The memory is used to store Figure 6 and / or Figure 7 The instructions in the corresponding embodiment.

[0127] The processor 920 is coupled to the memory 910 and can be implemented as one or more integrated circuits, such as a microprocessor or a microcontroller. The processor 920 is used to execute instructions stored in the memory, thereby improving the stability of the output voltage of the hydraulic generator.

[0128] In some embodiments, it is also possible to Fig. 9 As shown, the control device 9 includes a memory 910 and a processor 920. The processor 920 is coupled to the memory 910 via a BUS 930. The control device 9 can also be connected to an external storage device 950 via a storage interface 940 to call external data, and can also be connected to a network or another computer system (not shown) via a network interface 960, which will not be described in detail here.

[0129] In this embodiment, the data instructions are stored in the memory, and the instructions are processed by the processor, thereby improving the stability of the output voltage of the hydraulic generator.

[0130] In some embodiments, the present disclosure further provides a computer-readable storage medium (eg, a non-transitory computer-readable storage medium) having computer program instructions stored thereon, which when executed by a processor implements Figure 6and / or Figure 7 The steps of the method in the corresponding embodiment. Those skilled in the art should understand that the embodiments of the present disclosure can be provided as methods, devices, or computer program products. Therefore, the present disclosure can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present disclosure can take the form of a computer program product implemented on one or more computer-usable non-transient storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0131] In some embodiments, the present disclosure further provides a computer program product, which includes a computer program or instructions, and when the computer program or instructions are executed by a processor, the control method as described above is implemented.

[0132] The present disclosure is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of the present disclosure. It should be understood that each process and / or block in the flowchart and / or block diagram and the combination of processes and / or blocks in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0133] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0134] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0135] So far, the present disclosure has been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0136] Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A hydraulic power generation system, comprising: An oil tank, a variable piston pump, a control valve group, a hydraulic generator, a voltage collection device and a control device, wherein the control valve group includes an electric proportional flow valve, the oil tank, the variable piston pump, the electric proportional flow valve and the hydraulic generator are connected through pipelines, the voltage collection device is electrically connected to the hydraulic generator, and the voltage collection device is electrically connected to the control device; The voltage acquisition device is configured to acquire the AC voltage output by the hydraulic generator, obtain the effective voltage value of the AC voltage as the actual voltage, and transmit the actual voltage to the control device; The control device is configured to calculate the difference between the actual voltage and the target voltage, and when the difference is not zero, output a control signal to the electric proportional flow valve to adjust the size of the opening of the electric proportional flow valve.

2. The hydraulic power generation system according to claim 1, wherein: The control signal is a current signal; The control device is configured to reduce the current signal to reduce the opening of the electric proportional flow valve when the difference is greater than zero, and to increase the current signal to increase the opening of the electric proportional flow valve when the difference is less than zero.

3. The hydraulic power generation system according to claim 2, wherein: The control device is configured to gradually adjust the magnitude of the current signal based on a first current change when the absolute value of the difference is greater than or equal to a threshold, and to gradually adjust the magnitude of the current signal based on a second current change when the absolute value of the difference is less than the threshold, wherein the first current change is greater than the second current change.

4. The hydraulic power generation system according to claim 3, wherein: The first current variation ranges from 10 mA to 20 mA; The second current variation ranges from 5 mA to 10 mA.

5. The hydraulic power generation system according to claim 3, wherein: The threshold is 0.1 times the target voltage.

6. The hydraulic power generation system according to claim 1, wherein: The hydraulic generator comprises: a hydraulic motor and a generator, wherein the driving shaft of the hydraulic motor is coaxially connected with the rotor of the generator through a coupling, and the hydraulic motor is connected with the control valve group through a first oil inlet pipeline and a first oil return pipeline, wherein the first oil inlet pipeline is connected to the variable piston pump, and the first oil return pipeline is connected to the oil tank; The electric proportional flow valve is arranged on the first oil inlet pipeline.

7. The hydraulic power generation system according to claim 6, wherein: The control valve group also includes: a relief valve, disposed on the pipeline between the first oil inlet pipeline and the first oil return pipeline; and A one-way valve is connected to the first oil inlet pipeline through a pipeline, and is connected to the variable piston pump through a first feedback loop.

8. The hydraulic power generation system according to claim 7, further comprising: A turntable main valve, the turntable main valve is connected to the variable piston pump through a second oil inlet pipeline and a second feedback loop, the turntable main valve is connected to the oil tank through a second oil return pipeline, the turntable main valve comprises a main control valve and a plurality of main valve spools, the main control valve is connected to the second oil inlet pipeline, the second feedback loop and the second oil return pipeline, the plurality of main valve spools are connected to the second oil inlet pipeline, the second feedback loop and the oil cylinder, and the oil cylinder is connected to the second oil return pipeline; and A flushing valve is connected between the second oil inlet pipeline and the oil tank.

9. The hydraulic power generation system according to claim 8, wherein: The control device is further configured to control the main control valve and the flushing valve to be cut off, and control the plurality of main valve cores to be cut off during the process of starting the hydraulic engine.

10. The hydraulic power generation system according to claim 8, wherein: The control device is also configured to control the main control valve and the flushing valve to be turned on, control the corresponding main valve cores among the multiple main valve cores to be turned on, and control the electric proportional flow valve to be turned off during the process of controlling the operation of the oil cylinder.

11. The hydraulic power generation system according to claim 8, further comprising: a pressure sensor configured to collect the pressure in the first feedback loop or the second feedback loop and transmit the pressure to the control device; Wherein, the control device is further configured to transmit the pressure to a display device to display the pressure.

12. A control method for a control device of a hydraulic power generation system, wherein: The hydraulic power generation system comprises an oil tank, a variable piston pump, a control valve group, a hydraulic generator, a voltage acquisition device and the control device, wherein the control valve group comprises an electric proportional flow valve, the oil tank, the variable piston pump, the electric proportional flow valve and the hydraulic generator are connected through a pipeline, the voltage acquisition device is electrically connected to the hydraulic generator, the voltage acquisition device is electrically connected to the control device, and the voltage acquisition device is configured to acquire the AC voltage output by the hydraulic generator, obtain the effective voltage value of the AC voltage as the actual voltage, and transmit the actual voltage to the control device; The control method comprises: calculating a difference between the actual voltage and the target voltage; and When the difference is not zero, a control signal is output to the electric proportional flow valve to adjust the size of the opening of the electric proportional flow valve.

13. The control method according to claim 12, wherein: The control signal is a current signal; When the difference is not zero, outputting a control signal to the electric proportional flow valve to adjust the opening size of the electric proportional flow valve comprises: When the difference is greater than zero, reducing the current signal to reduce the opening of the electric proportional flow valve; and When the difference is less than zero, the current signal is increased to increase the opening of the electric proportional flow valve.

14. The control method according to claim 13, wherein: When the difference is not zero, outputting a control signal to the electric proportional flow valve to adjust the opening size of the electric proportional flow valve comprises: When the absolute value of the difference is greater than or equal to a threshold, gradually adjusting the magnitude of the current signal based on the first current variation; and When the absolute value of the difference is smaller than the threshold, the magnitude of the current signal is gradually adjusted based on the second current variation, wherein the first current variation is greater than the second current variation.

15. The control method according to claim 12, wherein: The hydraulic generator comprises: a hydraulic motor and a generator, wherein the driving shaft of the hydraulic motor is coaxially connected with the rotor of the generator through a coupling, the hydraulic motor is connected with the control valve group through a first oil inlet pipeline and a first oil return pipeline, wherein the first oil inlet pipeline is connected to the variable piston pump, the first oil return pipeline is connected to the oil tank, and the electric proportional flow valve is arranged on the first oil inlet pipeline; The control valve group further includes: a relief valve, which is arranged on the pipeline between the first oil inlet pipeline and the first oil return pipeline; and a one-way valve, which is connected to the first oil inlet pipeline through a pipeline and connected to the variable piston pump through a first feedback loop; The hydraulic power generation system further includes: a turntable main valve, the turntable main valve is connected to the variable piston pump through a second oil inlet pipeline and a second feedback loop, the turntable main valve is connected to the oil tank through a second oil return pipeline, the turntable main valve includes a main control valve and a plurality of main valve spools, the main control valve is connected to the second oil inlet pipeline, the second feedback loop and the second oil return pipeline, the plurality of main valve spools are connected to the second oil inlet pipeline, the second feedback loop and the oil cylinder, and the oil cylinder is connected to the second oil return pipeline; and a flushing valve connected between the second oil inlet pipeline and the oil tank; The control method further comprises: During the process of starting the hydraulic engine, the main control valve and the flushing valve are controlled to be cut off, and the plurality of main valve cores are controlled to be cut off.

16. The control method according to claim 15, further comprising: In the process of controlling the operation of the oil cylinder, the main control valve and the flushing valve are controlled to be turned on, the corresponding main valve cores among the plurality of main valve cores are controlled to be turned on, and the electric proportional flow valve is controlled to be turned off.

17. The control method according to claim 15, further comprising: receiving a pressure in the first feedback loop or the second feedback loop; and The pressure is transmitted to a display device to display the pressure.

18. A control device comprising: Memory; as well as A processor coupled to the memory, wherein the processor is configured to execute the control method according to any one of claims 12 to 17 based on instructions stored in the memory.

19. A computer-readable storage medium having computer instructions stored thereon, wherein the computer instructions, when executed by a processor, implement the control method according to any one of claims 12 to 17.

20. A computer program product, comprising a computer program or instructions, wherein the computer program or instructions, when executed by a processor, implements the control method according to any one of claims 12 to 17.

Images