Hydraulic system control method, device and petroleum machinery

Abstract

The present invention relates to the field of petroleum machinery and provides a hydraulic system control method, device, and petroleum machinery. The method comprises: determining a target displacement of a hydraulic pump and a target displacement of a hydraulic motor based on the current operating condition of the hydraulic system; obtaining a first transmission efficiency of the hydraulic system based on the target displacement of the hydraulic pump and the target displacement of the hydraulic motor, and obtaining a second transmission efficiency of the hydraulic system based on the current displacement of the hydraulic pump and the current displacement of the hydraulic motor; and adjusting the displacement of the hydraulic pump and the displacement of the hydraulic motor based on a comparison result of the first transmission efficiency and the second transmission efficiency to optimize the transmission efficiency of the hydraulic system. The present invention can effectively improve the transmission efficiency of the hydraulic system.

Description

Technical Field

[0001] The present invention relates to the technical field of petroleum machinery, and in particular to a hydraulic system control method and device and petroleum machinery. Background Art

[0002] Hydraulic transmission has many advantages such as light weight, small size, fast response speed, easy control, and wide range of stepless speed regulation. It is widely used in petroleum machinery and other power machines.

[0003] Hydraulic transmission typically utilizes a closed hydraulic system consisting of a hydraulic pump and a hydraulic motor. To increase the transmission system's speed regulation range, a variable displacement hydraulic pump is used for the hydraulic pump, and a variable displacement hydraulic motor is used for the hydraulic motor. In existing technical solutions, when the transmission system adjusts from minimum to maximum speed, the displacement of the hydraulic pump and hydraulic motor is controlled as follows: as the speed setting increases, the displacement of the hydraulic pump is first increased, while the displacement of the hydraulic motor is maintained at maximum. After the hydraulic pump's displacement reaches maximum, the hydraulic pump's displacement is maintained at maximum while the displacement of the hydraulic motor is reduced. However, this approach cannot ensure that the hydraulic pump and hydraulic motor operate at their optimal efficiency points, thereby failing to achieve optimal transmission efficiency for the hydraulic system, resulting in high fuel consumption and heat generation. Summary of the Invention

[0004] In view of the above problems existing in the prior art, the present invention provides a hydraulic system control method, device and petroleum machinery.

[0005] The present invention provides a hydraulic system control method, comprising:

[0006] determining a target displacement of the hydraulic pump and a target displacement of the hydraulic motor based on a current operating condition of the hydraulic system;

[0007] obtaining a first transmission efficiency of the hydraulic system based on a target displacement of the hydraulic pump and a target displacement of the hydraulic motor, and obtaining a second transmission efficiency of the hydraulic system based on a current displacement of the hydraulic pump and a current displacement of the hydraulic motor;

[0008] Based on the comparison result of the first transmission efficiency and the second transmission efficiency, the displacement of the hydraulic pump and the displacement of the hydraulic motor are adjusted to optimize the transmission efficiency of the hydraulic system.

[0009] According to the hydraulic system control method provided by the present invention, determining the target displacement of the hydraulic pump and the target displacement of the hydraulic motor based on the current working condition of the hydraulic system includes:

[0010] determining a first target operating pressure of the hydraulic pump based on a current rotational speed of the hydraulic pump and a current displacement ratio of the hydraulic pump, wherein a transmission efficiency of the hydraulic pump satisfies a first preset condition at the first target operating pressure of the hydraulic pump;

[0011] determining a first target operating pressure of the hydraulic motor based on a current rotational speed of the hydraulic motor and a current displacement ratio of the hydraulic motor, wherein a transmission efficiency of the hydraulic motor satisfies a second preset condition at the first target operating pressure of the hydraulic motor;

[0012] determining a target operating pressure of the hydraulic system based on a first target operating pressure of the hydraulic pump and a first target operating pressure of the hydraulic motor;

[0013] Based on the target working pressure of the hydraulic system, a target displacement of the hydraulic pump and a target displacement of the hydraulic motor are determined.

[0014] According to the hydraulic system control method provided by the present invention, determining the first target working pressure of the hydraulic pump based on the current speed of the hydraulic pump and the current displacement ratio of the hydraulic pump includes: determining, based on a first corresponding relationship, a value of the working pressure of the hydraulic pump at a first preferred transmission efficiency corresponding to the current speed of the hydraulic pump and the current displacement ratio of the hydraulic pump, as the first target working pressure of the hydraulic pump; wherein the first corresponding relationship is used to represent the corresponding relationship between the working pressure of the hydraulic pump, the speed of the hydraulic pump, the displacement ratio of the hydraulic pump, and the transmission efficiency of the hydraulic pump;

[0015] And / or, determining the first target working pressure of the hydraulic motor based on the current speed of the hydraulic motor and the current displacement ratio of the hydraulic motor includes: determining, based on a second corresponding relationship, a value of the working pressure of the hydraulic motor at a second preferred transmission efficiency corresponding to the current speed of the hydraulic motor and the current displacement ratio of the hydraulic motor, as the first target working pressure of the hydraulic motor; wherein the second corresponding relationship is used to characterize the corresponding relationship between the working pressure of the hydraulic motor, the speed of the hydraulic motor, the displacement ratio of the hydraulic motor and the transmission efficiency of the hydraulic motor.

[0016] According to the hydraulic system control method provided by the present invention, determining the target working pressure of the hydraulic system based on the first target working pressure of the hydraulic pump and the first target working pressure of the hydraulic motor includes:

[0017] The first target working pressure of the hydraulic pump and the first target working pressure of the hydraulic motor are averaged to obtain the target working pressure of the hydraulic system.

[0018] According to the hydraulic system control method provided by the present invention, determining the target displacement of the hydraulic pump and the target displacement of the hydraulic motor based on the target working pressure of the hydraulic system includes:

[0019] The target displacement of the hydraulic pump is determined based on the current working pressure of the hydraulic system, the target working pressure of the hydraulic system and the current displacement of the hydraulic pump, and the target displacement of the hydraulic motor is determined based on the current working pressure of the hydraulic system, the target working pressure of the hydraulic system and the current displacement of the hydraulic motor.

[0020] According to the hydraulic system control method provided by the present invention, obtaining the first transmission efficiency of the hydraulic system based on the target displacement of the hydraulic pump and the target displacement of the hydraulic motor includes:

[0021] determining a target transmission efficiency of the hydraulic pump based on a second target working pressure of the hydraulic pump, a target displacement ratio of the hydraulic pump, a current speed of the hydraulic pump, and the first corresponding relationship; wherein the second target working pressure of the hydraulic pump is a target working pressure of the hydraulic system, and the target displacement ratio of the hydraulic pump is a ratio of the target displacement of the hydraulic pump to the rated displacement of the hydraulic pump;

[0022] determining a target transmission efficiency of the hydraulic motor based on a second target working pressure of the hydraulic motor, a target displacement ratio of the hydraulic motor, a current speed of the hydraulic motor, and the second corresponding relationship; wherein the second target working pressure of the hydraulic motor is a target working pressure of the hydraulic system, and the target displacement ratio of the hydraulic motor is a ratio of the target displacement of the hydraulic motor to the rated displacement of the hydraulic motor;

[0023] A first transmission efficiency of the hydraulic system is determined based on the target transmission efficiency of the hydraulic pump and the target transmission efficiency of the hydraulic motor.

[0024] According to the hydraulic system control method provided by the present invention, adjusting the displacement of the hydraulic pump and the displacement of the hydraulic motor based on the comparison result of the first transmission efficiency and the second transmission efficiency includes:

[0025] If the first transmission efficiency is greater than the second transmission efficiency, the displacement of the hydraulic pump and the displacement of the hydraulic motor are adjusted based on the target displacement of the hydraulic pump and the target displacement of the hydraulic motor; otherwise, the displacement of the hydraulic pump and the displacement of the hydraulic motor are kept unchanged.

[0026] The present invention also provides a hydraulic system control device, comprising:

[0027] a first calculation module, configured to determine a target displacement of the hydraulic pump and a target displacement of the hydraulic motor based on a current operating condition of the hydraulic system;

[0028] a second calculation module, configured to obtain a first transmission efficiency of the hydraulic system based on a target displacement of the hydraulic pump and a target displacement of the hydraulic motor, and to obtain a second transmission efficiency of the hydraulic system based on a current displacement of the hydraulic pump and a current displacement of the hydraulic motor;

[0029] The third calculation module is used to adjust the displacement of the hydraulic pump and the displacement of the hydraulic motor based on the comparison result of the first transmission efficiency and the second transmission efficiency, so as to achieve the optimal transmission efficiency of the hydraulic system.

[0030] The present invention also provides a petroleum machinery, comprising: the hydraulic system control device as described above.

[0031] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any of the above-described hydraulic system control methods when executing the program.

[0032] The hydraulic system control method, device and petroleum machinery provided by the present invention determine the target displacement of the hydraulic pump and the target displacement of the hydraulic motor based on the current working condition of the hydraulic system, and obtain the first transmission efficiency of the hydraulic system based on the target displacement of the hydraulic pump and the target displacement of the hydraulic motor, and obtain the second transmission efficiency of the hydraulic system based on the current displacement of the hydraulic pump and the current displacement of the hydraulic motor. The displacement of the hydraulic pump and the displacement of the hydraulic motor are adjusted based on the comparison result of the first transmission efficiency and the second transmission efficiency, thereby realizing real-time adjustment of the displacement of the hydraulic pump and the hydraulic motor, so that they operate in the optimal transmission efficiency zone, thereby effectively improving the transmission efficiency of the hydraulic system, and further effectively reducing fuel consumption and heat generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 This is one of the flow charts of the hydraulic system control method provided by the present invention;

[0035] Figure 2 1. It is a flow chart of determining the target displacement of the hydraulic pump and the target displacement of the hydraulic motor based on the current working condition of the hydraulic system provided by the present invention;

[0036] Figure 3 It is a flow chart of obtaining a first transmission efficiency of a hydraulic system based on a target displacement of a hydraulic pump and a target displacement of a hydraulic motor provided by the present invention;

[0037] Figure 4 This is the second flow chart of the hydraulic system control method provided by the present invention;

[0038] Figure 5 It is a structural schematic diagram of the hydraulic system control device provided by the present invention;

[0039] Figure 6 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0040] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0041] The following combination Figures 1 to 4 The hydraulic system control method of the present invention is described. The hydraulic system control method of the present invention is executed by an electronic device such as a controller or the hardware and / or software therein. The controller can be a controller of the petroleum machinery itself, such as a vehicle controller, or can be set at a remote end. Figure 1 As shown, the hydraulic system control method of the present invention includes:

[0042] S101 : Determine a target displacement of a hydraulic pump and a target displacement of a hydraulic motor based on a current working condition of a hydraulic system.

[0043] Specifically, the hydraulic system includes a hydraulic pump and a hydraulic motor. The hydraulic pump is a variable hydraulic pump, and the hydraulic motor is a variable hydraulic motor.

[0044] The current operating condition of the hydraulic system, i.e., the operating condition of the hydraulic system at the current moment during the hydraulic system's operation, can be determined by the values of the hydraulic system's operating parameters at the current moment. The hydraulic system's operating parameters may include the displacement, speed, and operating pressure of the hydraulic pump, and the displacement, speed, and operating pressure of the hydraulic motor. For example, the current operating condition of the hydraulic system can be determined by the current values of the hydraulic pump's displacement, speed, and operating pressure, and the current values of the hydraulic motor's displacement, speed, and operating pressure.

[0045] The current values of the hydraulic pump displacement and the hydraulic motor displacement can be calculated from the input currents of the hydraulic pump and the hydraulic motor, respectively. The current values of the hydraulic pump speed and the hydraulic motor speed can be obtained from speed sensors installed on the drive shafts of the hydraulic pump and the hydraulic motor, respectively. The current values of the hydraulic pump operating pressure and the hydraulic motor operating pressure are the same, both representing the current values of the hydraulic system's operating pressure, i.e., the pressure on the high-pressure side of the hydraulic system, which can be obtained from a pressure sensor installed on the high-pressure side of the hydraulic system.

[0046] The target displacement of the hydraulic pump may be the optimal value that the hydraulic pump's displacement can take under the current operating conditions, and the target displacement of the hydraulic motor may be the optimal value that the hydraulic motor's displacement can take under the current operating conditions. The optimal displacement of the hydraulic pump may be determined based on the optimal transmission efficiency of the hydraulic pump under the current operating conditions, and the optimal displacement of the hydraulic motor may be determined based on the optimal transmission efficiency of the hydraulic motor under the current operating conditions. As an optional embodiment, a specific method for determining the target displacement of the hydraulic pump and the target displacement of the hydraulic motor based on the current operating conditions of the hydraulic system may include: determining a target working pressure of the hydraulic system based on the current operating conditions of the hydraulic system, and determining the target displacement of the hydraulic pump and the target displacement of the hydraulic motor based on the target working pressure of the hydraulic system. Determining the target working pressure of the hydraulic system based on the current operating conditions of the hydraulic system may include: determining a first target working pressure of the hydraulic pump and a first target working pressure of the hydraulic motor based on the current operating conditions of the hydraulic system; and determining the target working pressure of the hydraulic system based on the first target working pressure of the hydraulic pump and the first target working pressure of the hydraulic motor.

[0047] It is understandable that the target displacement of the hydraulic pump and / or the target displacement of the hydraulic motor may also be a suboptimal value, a suboptimal value, etc. that can be taken under the current working conditions.

[0048] S102. Obtain a first transmission efficiency of the hydraulic system based on the target displacement of the hydraulic pump and the target displacement of the hydraulic motor, and obtain a second transmission efficiency of the hydraulic system based on the current displacement of the hydraulic pump and the current displacement of the hydraulic motor.

[0049] Specifically, the first transmission efficiency of the hydraulic system is the transmission efficiency of the hydraulic system when the displacement of the hydraulic pump is the target displacement of the hydraulic pump and the displacement of the hydraulic motor is the target displacement of the hydraulic motor. The second transmission efficiency of the hydraulic system is the transmission efficiency of the hydraulic system when the displacement of the hydraulic pump is the current displacement of the hydraulic pump and the displacement of the hydraulic motor is the current displacement of the hydraulic motor. The current displacement of the hydraulic pump is the current value of the displacement of the hydraulic pump, and the current displacement of the hydraulic motor is the current value of the displacement of the hydraulic motor.

[0050] The transmission efficiency of the hydraulic system can be the product of the transmission efficiency of the hydraulic pump and the transmission efficiency of the hydraulic motor, wherein the transmission efficiency of the hydraulic pump can be determined according to the displacement, speed and working pressure of the hydraulic pump, and the transmission efficiency of the hydraulic motor can be determined according to the displacement, speed and working pressure of the hydraulic motor.

[0051] S103 . Based on a comparison result of the first transmission efficiency and the second transmission efficiency, adjust the displacement of the hydraulic pump and the displacement of the hydraulic motor to achieve optimal transmission efficiency of the hydraulic system.

[0052] Specifically, after obtaining the first transmission efficiency and the second transmission efficiency of the hydraulic system, the first transmission efficiency and the second transmission efficiency can be compared to adjust the displacement of the hydraulic pump and the displacement of the hydraulic motor according to the comparison result of the first transmission efficiency and the second transmission efficiency. For example, when the first transmission efficiency is less than or equal to the second transmission efficiency, the displacement of the hydraulic pump and the hydraulic motor can be kept unchanged, that is, the current displacement of the hydraulic pump is kept unchanged, and the current displacement of the hydraulic motor is kept unchanged. When the first transmission efficiency is greater than the second transmission efficiency, the displacement of the hydraulic pump can be adjusted to the target displacement of the hydraulic pump, and the displacement of the hydraulic motor can be adjusted to the target displacement of the hydraulic motor, so that the displacement of the hydraulic pump and the displacement of the hydraulic motor can be adjusted in real time according to the transmission efficiency of the hydraulic system, so that the hydraulic pump and the hydraulic motor both work in the optimal transmission efficiency zone, and thus the hydraulic system can work in the optimal transmission efficiency zone. Among them, in the process of adjusting the displacement of the hydraulic pump to the target displacement of the hydraulic pump and adjusting the displacement of the hydraulic motor to the target displacement of the hydraulic motor, the size of the current signal input to the hydraulic pump and the hydraulic motor can be adjusted respectively according to the target displacement of the hydraulic pump and the target displacement of the hydraulic motor to achieve adjustment of the displacement of the hydraulic pump and the hydraulic motor.

[0053] In the traditional method, when the transmission system is adjusted from the minimum speed to the maximum speed, as the speed setting increases, the displacement of the hydraulic pump is first increased, while the displacement of the hydraulic motor is maintained at the maximum; after the displacement of the hydraulic pump reaches the maximum, the hydraulic pump displacement is maintained at the maximum, while the displacement of the hydraulic motor is reduced. This cannot ensure that the hydraulic pump and hydraulic motor operate at the optimal efficiency point, and thus cannot ensure that the transmission efficiency of the hydraulic system reaches the optimal level, which in turn leads to high fuel consumption and high heat generation.

[0054] The embodiment of the present invention determines the target displacement of the hydraulic pump and the target displacement of the hydraulic motor based on the current working condition of the hydraulic system, obtains the first transmission efficiency of the hydraulic system based on the target displacement of the hydraulic pump and the target displacement of the hydraulic motor, and obtains the second transmission efficiency of the hydraulic system based on the current displacement of the hydraulic pump and the current displacement of the hydraulic motor, and adjusts the displacement of the hydraulic pump and the hydraulic motor based on the comparison result of the first transmission efficiency and the second transmission efficiency, thereby realizing real-time adjustment of the displacement of the hydraulic pump and the hydraulic motor, making them operate in the optimal transmission efficiency zone, thereby realizing effective improvement of the transmission efficiency of the hydraulic system, and further effectively reducing fuel consumption and heat generation.

[0055] In an exemplary embodiment, the target displacement of the hydraulic pump and the target displacement of the hydraulic motor are determined based on the current working condition of the hydraulic system, such as Figure 2 As shown, its specific implementation may include:

[0056] S201. Determine a first target operating pressure of the hydraulic pump based on a current rotational speed of the hydraulic pump and a current displacement ratio of the hydraulic pump, wherein the transmission efficiency of the hydraulic pump meets a first preset condition under the first target operating pressure of the hydraulic pump.

[0057] S202. Determine a first target operating pressure of the hydraulic motor based on a current rotational speed of the hydraulic motor and a current displacement ratio of the hydraulic motor, wherein the transmission efficiency of the hydraulic motor meets a second preset condition under the first target operating pressure of the hydraulic motor.

[0058] S203 : Determine a target working pressure of the hydraulic system based on the first target working pressure of the hydraulic pump and the first target working pressure of the hydraulic motor.

[0059] S204 : Determine a target displacement of the hydraulic pump and a target displacement of the hydraulic motor based on a target working pressure of the hydraulic system.

[0060] Specifically, the order of step S201 and step S202 is not specifically limited. The current displacement ratio of the hydraulic pump, i.e., the current value of the displacement ratio of the hydraulic pump, is the ratio of the current displacement of the hydraulic pump to the rated displacement of the hydraulic pump, wherein the rated displacement of the hydraulic pump is the rated maximum displacement of the hydraulic pump. The current displacement ratio of the hydraulic motor, i.e., the current value of the displacement ratio of the hydraulic motor, is the ratio of the current displacement of the hydraulic motor to the rated displacement of the hydraulic motor, wherein the rated displacement of the hydraulic motor is the rated maximum displacement of the hydraulic motor. The current speed of the hydraulic pump is the current value of the speed of the hydraulic pump, and the current speed of the hydraulic motor is the current value of the speed of the hydraulic motor.

[0061] The first target operating pressure of the hydraulic pump is determined based on the current speed and displacement ratio of the hydraulic pump. At the first target operating pressure of the hydraulic pump, the transmission efficiency of the hydraulic pump satisfies a first preset condition. That is, the first target operating pressure of the hydraulic pump is the value of the hydraulic pump's operating pressure when the speed and displacement ratio of the hydraulic pump are both at their current values and the transmission efficiency of the hydraulic pump satisfies the first preset condition. The first preset condition may be an optimal value of the transmission efficiency of the hydraulic pump when the speed and displacement ratio of the hydraulic pump are both at their current values.

[0062] The first target operating pressure of the hydraulic motor is determined based on the current speed and displacement ratio of the hydraulic motor. At the first target operating pressure of the hydraulic motor, the transmission efficiency of the hydraulic motor satisfies a second preset condition. That is, the first target operating pressure of the hydraulic motor is the value of the hydraulic motor's operating pressure when the speed and displacement ratio of the hydraulic motor are both at their current values and the transmission efficiency of the hydraulic motor satisfies the second preset condition. The second preset condition may be an optimal value of the transmission efficiency of the hydraulic motor when the speed and displacement ratio of the hydraulic motor are both at their current values.

[0063] The first target working pressure of the hydraulic pump and the first target working pressure of the hydraulic motor may be one or more discrete values or a continuous data segment.

[0064] After determining the first target operating pressure of the hydraulic pump and the first target operating pressure of the hydraulic motor, the target operating pressure of the hydraulic system is further determined based on the first target operating pressure of the hydraulic pump and the first target operating pressure of the hydraulic motor. When the speed of the hydraulic pump and the speed of the hydraulic motor, as well as the power of the hydraulic system, are constant, the operating pressure of the hydraulic system is inversely proportional to the displacement of the hydraulic pump and the hydraulic motor. Therefore, based on the target operating pressure of the hydraulic system, the target displacement of the hydraulic pump and the target displacement of the hydraulic motor can be further determined.

[0065] It is understood that if the first target working pressure of the hydraulic pump and / or the first target working pressure of the hydraulic motor are continuous data segments, if there is an intersection between the first target working pressure of the hydraulic pump and the first target working pressure of the hydraulic motor, the target working pressure of the hydraulic system is determined based on the intersection; if there is no intersection, there is no target working pressure for the hydraulic system, and the current displacement of the hydraulic pump and the current displacement of the hydraulic motor remain unchanged. If the first target working pressure of the hydraulic pump and the first target working pressure of the hydraulic motor are both discrete values, if the distance between the first target working pressure of the hydraulic pump and the first target working pressure of the hydraulic motor is less than or equal to a preset distance or is in the same preset interval, the target working pressure of the hydraulic system is determined based on the first target working pressure of the hydraulic pump and the first target working pressure of the hydraulic motor whose distance is less than or equal to the preset distance or is in the same preset interval; otherwise, there is no target working pressure for the hydraulic system, and the current displacement of the hydraulic pump and the current displacement of the hydraulic motor remain unchanged.

[0066] In an embodiment of the present invention, the transmission efficiency of the hydraulic pump and the transmission efficiency of the hydraulic motor are constrained to respectively determine the first target working pressure of the hydraulic pump and the first target working pressure of the hydraulic motor, and the target working pressure of the hydraulic system is determined based on the first target working pressure of the hydraulic pump and the first target working pressure of the hydraulic motor. This can effectively ensure the validity of the determination result of the target working pressure of the hydraulic system, and can ensure the transmission efficiency of the hydraulic system under the target working pressure of the hydraulic system. Furthermore, the target displacement of the hydraulic pump and the target displacement of the hydraulic motor are determined according to the target working pressure of the hydraulic system, and can ensure the transmission efficiency of the hydraulic pump and the hydraulic motor.

[0067] In an exemplary embodiment, determining the first target working pressure of the hydraulic pump based on the current speed of the hydraulic pump and the current displacement ratio of the hydraulic pump includes: determining, based on a first correspondence, a value of the working pressure of the hydraulic pump at a first preferred transmission efficiency corresponding to the current speed of the hydraulic pump and the current displacement ratio of the hydraulic pump, as the first target working pressure of the hydraulic pump; wherein the first correspondence is used to represent a correspondence between the working pressure of the hydraulic pump, the speed of the hydraulic pump, the displacement ratio of the hydraulic pump, and the transmission efficiency of the hydraulic pump;

[0068] And / or, determining the first target working pressure of the hydraulic motor based on the current speed of the hydraulic motor and the current displacement ratio of the hydraulic motor includes: determining, based on a second corresponding relationship, a value of the working pressure of the hydraulic motor at a second preferred transmission efficiency corresponding to the current speed of the hydraulic motor and the current displacement ratio of the hydraulic motor, as the first target working pressure of the hydraulic motor; wherein the second corresponding relationship is used to characterize the corresponding relationship between the working pressure of the hydraulic motor, the speed of the hydraulic motor, the displacement ratio of the hydraulic motor and the transmission efficiency of the hydraulic motor.

[0069] Specifically, the first correspondence is used to characterize the correspondence between the hydraulic pump's operating pressure, the hydraulic pump's rotational speed, the hydraulic pump's displacement ratio, and the hydraulic pump's transmission efficiency. Based on the first correspondence, the hydraulic pump's current rotational speed and the hydraulic pump's current displacement ratio can be matched to obtain the hydraulic pump's operating pressure at a first preferred transmission efficiency corresponding to the hydraulic pump's current rotational speed and the hydraulic pump's current displacement ratio, and this is used as the hydraulic pump's first target operating pressure. The first preferred transmission efficiency satisfies a first preset condition and can be the optimal value of the hydraulic pump's transmission efficiency corresponding to the hydraulic pump's current rotational speed and the hydraulic pump's current displacement ratio.

[0070] The second correspondence is used to characterize the correspondence between the hydraulic motor's operating pressure, the hydraulic motor's speed, the hydraulic motor's displacement ratio, and the hydraulic motor's transmission efficiency. Based on the second correspondence, the hydraulic motor's current speed and displacement ratio can be matched to obtain the hydraulic motor's operating pressure at the second preferred transmission efficiency corresponding to the hydraulic motor's current speed and displacement ratio, and use this as the hydraulic motor's first target operating pressure. The second preferred transmission efficiency satisfies the second preset condition and can be the optimal value of the hydraulic motor's transmission efficiency corresponding to the hydraulic motor's current speed and displacement ratio.

[0071] The first correspondence and the second correspondence can be pre-acquired and stored so that they can be readily retrieved when determining the first target operating pressure of the hydraulic pump and the first target operating pressure of the hydraulic motor, thereby enabling the first target operating pressures of the hydraulic pump and the hydraulic motor to be determined quickly and accurately. The first correspondence can be determined based on measured values of the speed, displacement, operating pressure, and transmission efficiency of the hydraulic pump, and the second correspondence can be determined based on measured values of the speed, displacement, operating pressure, and transmission efficiency of the hydraulic motor. The first correspondence and the second correspondence can be stored in the form of a data table or a graph.

[0072] In an exemplary embodiment, determining the target working pressure of the hydraulic system based on the first target working pressure of the hydraulic pump and the first target working pressure of the hydraulic motor includes:

[0073] The first target working pressure of the hydraulic pump and the first target working pressure of the hydraulic motor are averaged to obtain the target working pressure of the hydraulic system.

[0074] Specifically, the first target working pressure of the hydraulic pump and the first target working pressure of the hydraulic motor can be averaged to obtain the target working pressure of the hydraulic system, which can quickly and effectively determine the target working pressure of the hydraulic system. Therefore, under the target working pressure of the hydraulic system, the transmission efficiency of the hydraulic pump and the hydraulic motor can be effectively guaranteed, thereby ensuring the transmission efficiency of the hydraulic system.

[0075] It is understood that if the first target working pressure of the hydraulic pump and / or the first target working pressure of the hydraulic motor are continuous data segments, if there is an intersection between the first target working pressure of the hydraulic pump and the first target working pressure of the hydraulic motor, the intersection is averaged to obtain the target working pressure of the hydraulic system; if there is no intersection, there is no target working pressure for the hydraulic system, and the current displacement of the hydraulic pump and the current displacement of the hydraulic motor remain unchanged, so that the target working pressure of the hydraulic system can simultaneously ensure the transmission efficiency of the hydraulic pump and the hydraulic motor. If the first target working pressure of the hydraulic pump and the first target working pressure of the hydraulic motor are both discrete values, if the distance between the first target working pressure of the hydraulic pump and the first target working pressure of the hydraulic motor is less than or equal to a preset distance or is within the same preset interval, the first target working pressures of the hydraulic pump and the first target working pressures of the hydraulic motor whose distance is less than or equal to the preset distance or is within the same preset interval are averaged to obtain the target working pressure of the hydraulic system; otherwise, there is no target working pressure for the hydraulic system, and the current displacement of the hydraulic pump and the current displacement of the hydraulic motor remain unchanged.

[0076] In an exemplary embodiment, determining the target displacement of the hydraulic pump and the target displacement of the hydraulic motor based on the target working pressure of the hydraulic system includes:

[0077] The target displacement of the hydraulic pump is determined based on the current working pressure of the hydraulic system, the target working pressure of the hydraulic system and the current displacement of the hydraulic pump, and the target displacement of the hydraulic motor is determined based on the current working pressure of the hydraulic system, the target working pressure of the hydraulic system and the current displacement of the hydraulic motor.

[0078] Specifically, the current working pressure of the hydraulic system is the current value of the working pressure of the hydraulic system. The power of the hydraulic system = the working pressure of the hydraulic system × the displacement of the hydraulic pump × the speed of the hydraulic pump = the working pressure of the hydraulic system × the displacement of the hydraulic motor × the speed of the hydraulic motor, that is, C = p × vb × nb = ps × vb1 × nb, and C = p × vm × nm = ps × vm1 × nm, where C is the power of the hydraulic system, p and ps are the current working pressure and target working pressure of the hydraulic system, vb and vb1 are the current displacement and target displacement of the hydraulic pump, nb is the current speed of the hydraulic pump, vm and vm1 are the current displacement and target displacement of the hydraulic motor, and nm is the current speed of the hydraulic motor. That is, when the speed of the hydraulic pump, the speed of the hydraulic motor and the power of the hydraulic system are constant, the displacement of the hydraulic pump and the displacement of the hydraulic motor are inversely proportional to the working pressure of the hydraulic system, vb1 = p × vb / ps, vm1 = p × vm / ps. Therefore, the target displacement of the hydraulic pump and the target displacement of the hydraulic motor can be determined quickly and accurately according to the target working pressure of the hydraulic system.

[0079] In an exemplary embodiment, the first transmission efficiency of the hydraulic system is obtained based on the target displacement of the hydraulic pump and the target displacement of the hydraulic motor, such as Figure 3 As shown, its specific implementation may include:

[0080] S301. Determine the target transmission efficiency of the hydraulic pump based on the second target working pressure of the hydraulic pump, the target displacement ratio of the hydraulic pump, the current speed of the hydraulic pump and the first corresponding relationship; wherein the second target working pressure of the hydraulic pump is the target working pressure of the hydraulic system, and the target displacement ratio of the hydraulic pump is the ratio of the target displacement of the hydraulic pump to the rated displacement of the hydraulic pump.

[0081] S302. Determine the target transmission efficiency of the hydraulic motor based on the second target working pressure of the hydraulic motor, the target displacement ratio of the hydraulic motor, the current speed of the hydraulic motor and the second corresponding relationship; wherein the second target working pressure of the hydraulic motor is the target working pressure of the hydraulic system, and the target displacement ratio of the hydraulic motor is the ratio of the target displacement of the hydraulic motor to the rated displacement of the hydraulic motor.

[0082] S303 : Determine a first transmission efficiency of the hydraulic system based on the target transmission efficiency of the hydraulic pump and the target transmission efficiency of the hydraulic motor.

[0083] Specifically, the order of steps S301 and S302 is not specifically limited. The second target operating pressure of the hydraulic pump and the second target operating pressure of the hydraulic motor are both target operating pressures of the hydraulic system. The target displacement ratio of the hydraulic pump is the ratio of the target displacement of the hydraulic pump to the rated displacement of the hydraulic pump, and the target displacement ratio of the hydraulic motor is the ratio of the target displacement of the hydraulic motor to the rated displacement of the hydraulic motor.

[0084] Based on the first corresponding relationship, the second target working pressure of the hydraulic pump, the target displacement ratio of the hydraulic pump and the current speed of the hydraulic pump are matched to obtain the transmission efficiency of the hydraulic pump corresponding to the second target working pressure of the hydraulic pump, the target displacement ratio of the hydraulic pump and the current speed of the hydraulic pump, that is, the target transmission efficiency of the hydraulic pump; based on the second corresponding relationship, the second target working pressure of the hydraulic motor, the target displacement ratio of the hydraulic motor and the current speed of the hydraulic motor are matched to obtain the transmission efficiency of the hydraulic motor corresponding to the second target working pressure of the hydraulic motor, the target displacement ratio of the hydraulic motor and the current speed of the hydraulic motor, that is, the target transmission efficiency of the hydraulic motor, thereby quickly and accurately determining the target transmission efficiency of the hydraulic pump under the target displacement of the hydraulic pump and the target transmission ratio of the hydraulic motor under the target displacement of the hydraulic motor.

[0085] After determining the target transmission efficiency of the hydraulic pump and the target transmission efficiency of the hydraulic motor, the target transmission efficiency of the hydraulic pump can be multiplied by the target transmission efficiency of the hydraulic motor to obtain the first transmission efficiency of the hydraulic system. Based on the comparison result of the first transmission efficiency and the second transmission efficiency of the hydraulic system, the displacement of the hydraulic pump and the hydraulic motor can be adjusted in real time to make the hydraulic pump and the hydraulic motor operate in the optimal transmission efficiency zone, thereby improving the transmission efficiency of the hydraulic system.

[0086] The method for obtaining the second transmission efficiency of the hydraulic system based on the current displacement of the hydraulic pump and the current displacement of the hydraulic motor may be the same as the method for obtaining the first transmission efficiency. For example, it may include:

[0087] Determining a current transmission efficiency of the hydraulic pump based on a current working pressure of the hydraulic pump, a current displacement ratio of the hydraulic pump, a current speed of the hydraulic pump, and the first corresponding relationship; wherein the current working pressure of the hydraulic pump is the current working pressure of the hydraulic system;

[0088] determining a current transmission efficiency of the hydraulic motor based on a current working pressure of the hydraulic motor, a current displacement ratio of the hydraulic motor, a current speed of the hydraulic motor, and a second corresponding relationship; wherein the current working pressure of the hydraulic motor is the current working pressure of the hydraulic system;

[0089] A second transmission efficiency of the hydraulic system is determined based on the current transmission efficiency of the hydraulic pump and the current transmission efficiency of the hydraulic motor.

[0090] In an exemplary embodiment, adjusting the displacement of the hydraulic pump and the displacement of the hydraulic motor based on the comparison result of the first transmission efficiency and the second transmission efficiency includes:

[0091] If the first transmission efficiency is greater than the second transmission efficiency, the displacement of the hydraulic pump and the displacement of the hydraulic motor are adjusted based on the target displacement of the hydraulic pump and the target displacement of the hydraulic motor; otherwise, the displacement of the hydraulic pump and the displacement of the hydraulic motor are kept unchanged.

[0092] Specifically, if the first transmission efficiency is less than or equal to the second transmission efficiency, the displacement of the hydraulic pump and the displacement of the hydraulic motor are kept unchanged, that is, the current displacement of the hydraulic pump and the current displacement of the hydraulic motor are kept unchanged.

[0093] If the first transmission efficiency is greater than the second transmission efficiency, the displacement of the hydraulic pump can be adjusted to the target displacement of the hydraulic pump and the displacement of the hydraulic motor can be adjusted to the target displacement of the hydraulic motor, so that both the hydraulic pump and the hydraulic motor operate in the optimal transmission efficiency zone, thereby improving the transmission efficiency of the hydraulic system.

[0094] The following describes in detail the implementation process of the hydraulic system control method of the present invention through an optional embodiment. Figure 4 As shown, the specific implementation process may include:

[0095] S401, respectively obtaining the current displacement, current speed, and current working pressure of the hydraulic pump and the current displacement, current speed, and current working pressure of the hydraulic motor;

[0096] S402: Obtaining a current transmission efficiency of the hydraulic pump and a first target operating pressure of the hydraulic pump based on the first corresponding relationship and the current displacement, current speed, and current operating pressure of the hydraulic pump, and obtaining a current transmission efficiency of the hydraulic motor and a first target operating pressure of the hydraulic motor based on the second corresponding relationship and the current displacement, current speed, and current operating pressure of the hydraulic motor;

[0097] S403, obtaining a target working pressure of the hydraulic system based on a first target working pressure of the hydraulic pump and a first target working pressure of the hydraulic motor;

[0098] S404, determining a target displacement of the hydraulic pump and a target displacement of the hydraulic motor based on a target working pressure of the hydraulic system;

[0099] S405: Obtain a target transmission efficiency of the hydraulic pump based on the first corresponding relationship, the target working pressure of the hydraulic system, the target displacement of the hydraulic pump, and the current speed of the hydraulic pump; and obtain a target transmission efficiency of the hydraulic motor based on the second corresponding relationship, the target working pressure of the hydraulic system, the target displacement of the hydraulic motor, and the current speed of the hydraulic motor;

[0100] S406. Compare the first transmission efficiency and the second transmission efficiency of the hydraulic system; if the first transmission efficiency is greater than the second transmission efficiency, execute step S407; otherwise, execute step S401; wherein the first transmission efficiency is the product of the target transmission efficiency of the hydraulic pump and the target transmission efficiency of the hydraulic motor, and the second transmission efficiency is the product of the current transmission efficiency of the hydraulic pump and the current transmission efficiency of the hydraulic motor;

[0101] S407 , adjusting the displacement of the hydraulic pump and the hydraulic motor based on the target displacement of the hydraulic pump and the target displacement of the hydraulic motor, and executing step S401 .

[0102] The hydraulic system control device provided by the present invention is described below. The hydraulic system control device described below and the hydraulic system control method described above can be referred to in correspondence with each other. Figure 5 As shown, the hydraulic system control device of the present invention includes:

[0103] A first calculation module 501 determines a target displacement of the hydraulic pump and a target displacement of the hydraulic motor based on a current working condition of the hydraulic system;

[0104] a second calculation module 502 for obtaining a first transmission efficiency of the hydraulic system based on a target displacement of the hydraulic pump and a target displacement of the hydraulic motor, and obtaining a second transmission efficiency of the hydraulic system based on a current displacement of the hydraulic pump and a current displacement of the hydraulic motor;

[0105] The third calculation module 503 adjusts the displacement of the hydraulic pump and the displacement of the hydraulic motor based on the comparison result of the first transmission efficiency and the second transmission efficiency, so as to achieve the optimal transmission efficiency of the hydraulic system.

[0106] In an exemplary embodiment, the first calculation module 501 is specifically configured to:

[0107] determining a first target operating pressure of the hydraulic pump based on a current rotational speed of the hydraulic pump and a current displacement ratio of the hydraulic pump, wherein a transmission efficiency of the hydraulic pump satisfies a first preset condition at the first target operating pressure of the hydraulic pump;

[0108] determining a first target operating pressure of the hydraulic motor based on a current rotational speed of the hydraulic motor and a current displacement ratio of the hydraulic motor, wherein a transmission efficiency of the hydraulic motor satisfies a second preset condition at the first target operating pressure of the hydraulic motor;

[0109] determining a target operating pressure of the hydraulic system based on a first target operating pressure of the hydraulic pump and a first target operating pressure of the hydraulic motor;

[0110] Based on the target working pressure of the hydraulic system, a target displacement of the hydraulic pump and a target displacement of the hydraulic motor are determined.

[0111] In an exemplary embodiment, the first calculation module 501 is specifically configured to:

[0112] determining, based on a first correspondence, a value of the hydraulic pump's operating pressure at a first preferred transmission efficiency corresponding to a current rotational speed of the hydraulic pump and a current displacement ratio of the hydraulic pump, as a first target operating pressure of the hydraulic pump; wherein the first correspondence represents a correspondence between the hydraulic pump's operating pressure, the rotational speed of the hydraulic pump, the displacement ratio of the hydraulic pump, and the transmission efficiency of the hydraulic pump;

[0113] And / or, based on a second corresponding relationship, determine the value of the working pressure of the hydraulic motor at the second preferred transmission efficiency corresponding to the current speed of the hydraulic motor and the current displacement ratio of the hydraulic motor as the first target working pressure of the hydraulic motor; wherein, the second corresponding relationship is used to characterize the corresponding relationship between the working pressure of the hydraulic motor, the speed of the hydraulic motor, the displacement ratio of the hydraulic motor and the transmission efficiency of the hydraulic motor.

[0114] In an exemplary embodiment, the first calculation module 501 is specifically configured to:

[0115] The first target working pressure of the hydraulic pump and the first target working pressure of the hydraulic motor are averaged to obtain the target working pressure of the hydraulic system.

[0116] In an exemplary embodiment, the first calculation module 501 is specifically configured to:

[0117] The target displacement of the hydraulic pump is determined based on the current working pressure of the hydraulic system, the target working pressure of the hydraulic system and the current displacement of the hydraulic pump, and the target displacement of the hydraulic motor is determined based on the current working pressure of the hydraulic system, the target working pressure of the hydraulic system and the current displacement of the hydraulic motor.

[0118] In an exemplary embodiment, the second calculation module 502 is specifically configured to:

[0119] determining a target transmission efficiency of the hydraulic pump based on a second target working pressure of the hydraulic pump, a target displacement ratio of the hydraulic pump, a current speed of the hydraulic pump, and the first corresponding relationship; wherein the second target working pressure of the hydraulic pump is a target working pressure of the hydraulic system, and the target displacement ratio of the hydraulic pump is a ratio of the target displacement of the hydraulic pump to the rated displacement of the hydraulic pump;

[0120] determining a target transmission efficiency of the hydraulic motor based on a second target working pressure of the hydraulic motor, a target displacement ratio of the hydraulic motor, a current speed of the hydraulic motor, and the second corresponding relationship; wherein the second target working pressure of the hydraulic motor is a target working pressure of the hydraulic system, and the target displacement ratio of the hydraulic motor is a ratio of the target displacement of the hydraulic motor to the rated displacement of the hydraulic motor;

[0121] A first transmission efficiency of the hydraulic system is determined based on the target transmission efficiency of the hydraulic pump and the target transmission efficiency of the hydraulic motor.

[0122] In an exemplary embodiment, the third calculation module 503 is specifically configured to:

[0123] If the first transmission efficiency is greater than the second transmission efficiency, the displacement of the hydraulic pump and the displacement of the hydraulic motor are adjusted based on the target displacement of the hydraulic pump and the target displacement of the hydraulic motor; otherwise, the displacement of the hydraulic pump and the displacement of the hydraulic motor are kept unchanged.

[0124] The present invention further provides a petroleum machinery, comprising: a hydraulic system control device as described in any one of the above embodiments.

[0125] Specifically, petroleum machinery uses hydraulic transmission, such as oil drilling equipment and fracturing equipment.

[0126] Figure 6 An example of a physical structure diagram of an electronic device is shown below. Figure 6 As shown, the electronic device may include: a processor 601, a communications interface 602, a memory 603, and a communication bus 604, wherein the processor 601, the communications interface 602, and the memory 603 communicate with each other via the communication bus 604. The processor 601 may call logic instructions in the memory 603 to execute a hydraulic system control method, the method including: determining a target displacement of a hydraulic pump and a target displacement of a hydraulic motor based on a current working condition of the hydraulic system;

[0127] obtaining a first transmission efficiency of the hydraulic system based on a target displacement of the hydraulic pump and a target displacement of the hydraulic motor, and obtaining a second transmission efficiency of the hydraulic system based on a current displacement of the hydraulic pump and a current displacement of the hydraulic motor;

[0128] Based on the comparison result of the first transmission efficiency and the second transmission efficiency, the displacement of the hydraulic pump and the displacement of the hydraulic motor are adjusted to optimize the transmission efficiency of the hydraulic system.

[0129] In addition, the logic instructions in the above-mentioned memory 603 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0130] On the other hand, the present invention further provides a computer program product, the computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions, and when the program instructions are executed by a computer, the computer is capable of executing the hydraulic system control method provided by the above methods, the method comprising: determining a target displacement of a hydraulic pump and a target displacement of a hydraulic motor based on a current operating condition of the hydraulic system;

[0131] obtaining a first transmission efficiency of the hydraulic system based on a target displacement of the hydraulic pump and a target displacement of the hydraulic motor, and obtaining a second transmission efficiency of the hydraulic system based on a current displacement of the hydraulic pump and a current displacement of the hydraulic motor;

[0132] Based on the comparison result of the first transmission efficiency and the second transmission efficiency, the displacement of the hydraulic pump and the displacement of the hydraulic motor are adjusted to optimize the transmission efficiency of the hydraulic system.

[0133] In another aspect, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the computer program is implemented to perform the above-mentioned hydraulic system control method, the method comprising: determining a target displacement of a hydraulic pump and a target displacement of a hydraulic motor based on a current operating condition of the hydraulic system;

[0134] obtaining a first transmission efficiency of the hydraulic system based on a target displacement of the hydraulic pump and a target displacement of the hydraulic motor, and obtaining a second transmission efficiency of the hydraulic system based on a current displacement of the hydraulic pump and a current displacement of the hydraulic motor;

[0135] Based on the comparison result of the first transmission efficiency and the second transmission efficiency, the displacement of the hydraulic pump and the displacement of the hydraulic motor are adjusted to optimize the transmission efficiency of the hydraulic system.

[0136] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0137] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, or of course, by hardware. Based on this understanding, the essence of the above technical solution or the part that contributes to the existing technology can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or certain parts of the embodiments.

[0138] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A hydraulic system control method, characterized in that: include: determining a target displacement of the hydraulic pump and a target displacement of the hydraulic motor based on a current operating condition of the hydraulic system; obtaining a first transmission efficiency of the hydraulic system based on a target displacement of the hydraulic pump and a target displacement of the hydraulic motor, and obtaining a second transmission efficiency of the hydraulic system based on a current displacement of the hydraulic pump and a current displacement of the hydraulic motor; Based on the comparison result of the first transmission efficiency and the second transmission efficiency, the displacement of the hydraulic pump and the displacement of the hydraulic motor are adjusted to optimize the transmission efficiency of the hydraulic system.

2. The hydraulic system control method according to claim 1, characterized in that: Determining the target displacement of the hydraulic pump and the target displacement of the hydraulic motor based on the current working condition of the hydraulic system includes: determining a first target operating pressure of the hydraulic pump based on a current rotational speed of the hydraulic pump and a current displacement ratio of the hydraulic pump, wherein a transmission efficiency of the hydraulic pump satisfies a first preset condition at the first target operating pressure of the hydraulic pump; determining a first target operating pressure of the hydraulic motor based on a current rotational speed of the hydraulic motor and a current displacement ratio of the hydraulic motor, wherein a transmission efficiency of the hydraulic motor satisfies a second preset condition at the first target operating pressure of the hydraulic motor; determining a target operating pressure of the hydraulic system based on a first target operating pressure of the hydraulic pump and a first target operating pressure of the hydraulic motor; Based on the target working pressure of the hydraulic system, a target displacement of the hydraulic pump and a target displacement of the hydraulic motor are determined.

3. The hydraulic system control method according to claim 2, characterized in that: Determining the first target working pressure of the hydraulic pump based on the current speed of the hydraulic pump and the current displacement ratio of the hydraulic pump includes: determining, based on a first corresponding relationship, a value of the working pressure of the hydraulic pump at a first preferred transmission efficiency corresponding to the current speed of the hydraulic pump and the current displacement ratio of the hydraulic pump, as the first target working pressure of the hydraulic pump; wherein the first corresponding relationship is used to represent a corresponding relationship between the working pressure of the hydraulic pump, the speed of the hydraulic pump, the displacement ratio of the hydraulic pump, and the transmission efficiency of the hydraulic pump; And / or, determining the first target working pressure of the hydraulic motor based on the current speed of the hydraulic motor and the current displacement ratio of the hydraulic motor includes: determining, based on a second corresponding relationship, a value of the working pressure of the hydraulic motor at a second preferred transmission efficiency corresponding to the current speed of the hydraulic motor and the current displacement ratio of the hydraulic motor, as the first target working pressure of the hydraulic motor; wherein the second corresponding relationship is used to characterize the corresponding relationship between the working pressure of the hydraulic motor, the speed of the hydraulic motor, the displacement ratio of the hydraulic motor and the transmission efficiency of the hydraulic motor.

4. The hydraulic system control method according to claim 2, characterized in that: Determining the target working pressure of the hydraulic system based on the first target working pressure of the hydraulic pump and the first target working pressure of the hydraulic motor includes: The first target working pressure of the hydraulic pump and the first target working pressure of the hydraulic motor are averaged to obtain the target working pressure of the hydraulic system.

5. The hydraulic system control method according to claim 2, characterized in that: The determining the target displacement of the hydraulic pump and the target displacement of the hydraulic motor based on the target working pressure of the hydraulic system includes: The target displacement of the hydraulic pump is determined based on the current working pressure of the hydraulic system, the target working pressure of the hydraulic system and the current displacement of the hydraulic pump, and the target displacement of the hydraulic motor is determined based on the current working pressure of the hydraulic system, the target working pressure of the hydraulic system and the current displacement of the hydraulic motor.

6. The hydraulic system control method according to claim 3, characterized in that: The obtaining of the first transmission efficiency of the hydraulic system based on the target displacement of the hydraulic pump and the target displacement of the hydraulic motor includes: determining a target transmission efficiency of the hydraulic pump based on a second target working pressure of the hydraulic pump, a target displacement ratio of the hydraulic pump, a current speed of the hydraulic pump, and the first corresponding relationship; wherein the second target working pressure of the hydraulic pump is a target working pressure of the hydraulic system, and the target displacement ratio of the hydraulic pump is a ratio of the target displacement of the hydraulic pump to the rated displacement of the hydraulic pump; determining a target transmission efficiency of the hydraulic motor based on a second target working pressure of the hydraulic motor, a target displacement ratio of the hydraulic motor, a current speed of the hydraulic motor, and the second corresponding relationship; wherein the second target working pressure of the hydraulic motor is a target working pressure of the hydraulic system, and the target displacement ratio of the hydraulic motor is a ratio of the target displacement of the hydraulic motor to the rated displacement of the hydraulic motor; A first transmission efficiency of the hydraulic system is determined based on the target transmission efficiency of the hydraulic pump and the target transmission efficiency of the hydraulic motor.

7. The hydraulic system control method according to any one of claims 1 to 6, characterized in that: The adjusting the displacement of the hydraulic pump and the displacement of the hydraulic motor based on the comparison result of the first transmission efficiency and the second transmission efficiency includes: If the first transmission efficiency is greater than the second transmission efficiency, the displacement of the hydraulic pump and the displacement of the hydraulic motor are adjusted based on the target displacement of the hydraulic pump and the target displacement of the hydraulic motor; otherwise, the displacement of the hydraulic pump and the displacement of the hydraulic motor are kept unchanged.

8. A hydraulic system control device, characterized in that: include: a first calculation module, configured to determine a target displacement of the hydraulic pump and a target displacement of the hydraulic motor based on a current operating condition of the hydraulic system; a second calculation module, configured to obtain a first transmission efficiency of the hydraulic system based on a target displacement of the hydraulic pump and a target displacement of the hydraulic motor, and to obtain a second transmission efficiency of the hydraulic system based on a current displacement of the hydraulic pump and a current displacement of the hydraulic motor; The third calculation module is used to adjust the displacement of the hydraulic pump and the displacement of the hydraulic motor based on the comparison result of the first transmission efficiency and the second transmission efficiency, so as to achieve the optimal transmission efficiency of the hydraulic system.

9. A petroleum machinery, characterized in that: include: The hydraulic system control device according to claim 8.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the hydraulic system control method according to any one of claims 1 to 7 is implemented.

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