An electro-hydraulic multi-pump system and a control method based on the electro-hydraulic multi-pump system

Abstract

This invention provides an electro-hydraulic multi-pump system and its control method, comprising: at least one control path, the control path including multiple sub-control paths connected in parallel and connected to a first oil outlet; wherein, one of the multiple sub-control paths serves as a master control path, and the remaining sub-control paths serve as slave control paths; the master control path is used to: determine whether the total flow rate to be processed is greater than a first maximum private flow rate of the master control path; in response to the total flow rate to be processed being greater than the first maximum private flow rate, the master control path provides a portion of the total flow rate to be processed corresponding to the first maximum private flow rate through the first oil outlet, and uses a chain-like allocation method to distribute the first portion of the flow rate exceeding the first maximum private flow rate to at least one slave control path, so that at least one slave control path provides the first portion of the flow rate through the first oil outlet. This invention can realize flow distribution, making the flow distribution link precise and controllable, and improving the overall efficiency of the system.

Description

Technical Field

[0001] This invention relates to the technical field of hydraulic servo drive, and in particular to an electro-hydraulic multi-pump system and a control method based on the electro-hydraulic multi-pump system. Background Technology

[0002] In the field of servo systems, with the continuous improvement of industrial automation, the requirements for servo system performance are becoming increasingly stringent. Flow distribution, as a key component of servo systems, directly affects the system's stability, response speed, and control accuracy. Currently, most servo systems still rely on experience-based adjustment for flow distribution. However, experience-based adjustment lacks precise quantitative basis, and differences in the experience of different engineers can easily lead to inconsistent flow distribution schemes. This traditional method is difficult to meet the high-precision and high-efficiency control requirements under complex operating conditions. Summary of the Invention

[0003] This invention mainly provides an electro-hydraulic multi-pump system and a control method based on the electro-hydraulic multi-pump system. It uses the system to distribute flow, which is precise and controllable, and can improve the efficiency of the system.

[0004] To solve the above-mentioned technical problems, the first technical solution adopted by the present invention is: to provide an electro-hydraulic multi-pump system, the electro-hydraulic multi-pump system comprising: at least one control path, the control path comprising multiple sub-control paths, the multiple sub-control paths being connected in parallel and connected to a first oil outlet; wherein, one of the multiple sub-control paths serves as a main control path, and the remaining sub-control paths serve as slave control paths; the main control path is used for:

[0005] Determine whether the total flow to be processed is greater than the first maximum private flow of the main control path; in response to the total flow to be processed being greater than the first maximum private flow, the main control path provides a portion of the total flow to be processed corresponding to the first maximum private flow through the first oil outlet, and uses a chain-like allocation method to allocate the first portion of the flow exceeding the first maximum private flow to at least one slave control path, so that at least one slave control path provides the first portion of the flow through the first oil outlet.

[0006] In one embodiment, the main control path is further configured to: in response to the total flow to be processed not being greater than a first maximum private flow, the main control path provides the total flow to be processed through a first oil outlet.

[0007] In one embodiment, the main control path is further used for:

[0008] Determine whether the first portion of the flow is greater than the second maximum private flow of the first slave control path; in response to the first portion of the flow being greater than the second maximum private flow, allocate the second maximum private flow corresponding to the first slave control path to the first slave control path, so that the first slave control path provides a portion of the first portion of the flow corresponding to the second maximum private flow through the first oil outlet; and allocate the second portion of the flow exceeding the second maximum private flow to the second slave control path, so that the second slave control path provides the second portion of the flow through the first oil outlet; or, in response to the first portion of the flow not being greater than the second maximum private flow, control the first slave control path to provide the first portion of the flow through the first oil outlet.

[0009] In one embodiment, in response to the total traffic to be processed being greater than the maximum private traffic of the system, the portion of the total traffic to be processed exceeding the maximum private traffic of the system is allocated to the main control path and the slave control path according to a preset ratio;

[0010] The maximum private traffic of the system is the sum of the maximum private traffic of all sub-control paths.

[0011] In one embodiment, the sub-control path includes a drive unit and a power component connected to the drive unit, the drive unit driving the power component to provide the corresponding flow rate.

[0012] In one embodiment, the driving unit in the main control path includes a main network interface, and the driving unit in the slave control path includes a slave network interface. The main network interface is connected to the slave network interface. The main control path sends traffic allocation instructions and pressure control instructions to the slave control path through the main network interface and the slave network interface, so that the slave control path provides allocated traffic based on the traffic allocation instructions and pressure control instructions.

[0013] In one embodiment, the drive unit in the main control path includes a control interface for connecting to the control system and for receiving a first control parameter issued by the control system. The first control parameter includes a first flow parameter and a first pressure parameter. The first flow parameter represents the total flow to be processed, and the first pressure parameter represents the power parameter corresponding to the total flow to be processed. The main control path is used for flow control based on the first flow parameter and the first pressure parameter.

[0014] In one embodiment, the drive unit in the main control path includes a first feedback interface, and the main control path also includes a first pressure sensor. The first pressure sensor is connected to the first oil outlet and the first feedback interface, and is used to detect a first pressure signal at the first oil outlet and adjust the first pressure parameter based on the detected first pressure signal.

[0015] In one embodiment, each control path further includes a check valve connected to the power assembly and the first oil outlet.

[0016] In one embodiment, each drive unit in the control path includes a mode switching port. In response to receiving an enable signal at the mode switching port, the control path operates in a first operating mode. In response to receiving an enable-off signal at the mode switching port, the control path operates in a second operating mode. The first operating mode and the second operating mode are different.

[0017] In the second working mode, the control path is connected to the first oil outlet, and the flow rate allocated by the main control path is provided through the first oil outlet.

[0018] In one embodiment, each control passage includes a second oil outlet and a reversing valve connected to the second oil outlet; in the second operating mode, the reversing valve controls the control passage to connect with the first oil outlet; in the first operating mode, the reversing valve controls the control passage to connect with the second oil outlet, so that the control passage provides the corresponding flow rate through the second oil outlet.

[0019] In one embodiment, the drive unit in the main control path and the drive unit in the slave control path further include a network port, which is connected to a network bus to receive a second control parameter. The main control path provides a corresponding flow rate from the first oil outlet based on the second control parameter, and the slave control path provides a corresponding flow rate from the second oil outlet based on the second control parameter. The second control parameter includes a second flow rate parameter and a second pressure parameter.

[0020] In one embodiment, the drive unit in the main control path and the drive unit in the slave control path further include a second feedback interface. The slave control path further includes a second pressure sensor. The second pressure sensor is connected to the second oil outlet and the second feedback interface, and is used to detect the second pressure signal of the second oil outlet and adjust the second pressure parameter based on the second pressure signal.

[0021] In one embodiment, the electro-hydraulic multi-pump system includes multiple control paths, each sub-control path including a state switching port. In response to the state switching port receiving a switching enable signal, the multiple control paths are controlled to operate in a third operating mode. In response to the state switching port receiving a switching off signal, the multiple control paths are controlled to operate in a fourth operating mode. The third operating mode and the fourth operating mode are different.

[0022] In the third working mode, one of the multiple sub-control paths in each control path serves as the master control path, and the remaining sub-control paths serve as slave control paths.

[0023] In one embodiment, in the fourth operating mode, one of the sub-control paths included in the multiple control paths serves as the master control path, and the remaining sub-control paths serve as slave control paths.

[0024] In one embodiment, multiple control paths are used to execute different commands.

[0025] To solve the above-mentioned technical problems, the first technical solution adopted by the present invention is: to provide a control method based on an electro-hydraulic multi-pump system, wherein the electro-hydraulic multi-pump system includes any of the above-mentioned electro-hydraulic multi-pump systems, and the control method includes:

[0026] Determine whether the total traffic to be processed is greater than the first maximum private traffic of the main control path;

[0027] In response to the total flow to be processed being greater than the first maximum private flow, the main control path provides a portion of the total flow to be processed corresponding to the first maximum private flow through the first oil outlet, and uses a chain-like allocation method to allocate the first portion of the flow exceeding the first maximum private flow to at least one slave control path, so that at least one slave control path provides the first portion of the flow through the first oil outlet.

[0028] The beneficial effects of this invention are as follows: Unlike existing technologies, this invention provides an electro-hydraulic multi-pump system and a control method based on the electro-hydraulic multi-pump system. The electro-hydraulic multi-pump system of this invention includes: at least one control path, which includes multiple sub-control paths connected in parallel and connected to a first oil outlet; wherein, one of the multiple sub-control paths serves as a master control path, and the remaining sub-control paths serve as slave control paths; the master control path is used to: determine whether the total flow rate to be processed is greater than a first maximum private flow rate of the master control path; in response to the total flow rate to be processed being greater than the first maximum private flow rate, the master control path provides a portion of the total flow rate to be processed corresponding to the first maximum private flow rate through the first oil outlet, and uses a chain-like allocation method to allocate the first portion of the flow rate exceeding the first maximum private flow rate to at least one slave control path, so that at least one slave control path provides the first portion of the flow rate through the first oil outlet. The electro-hydraulic multi-pump system of this invention can perform flow allocation based on the maximum private flow rate, making the flow allocation process precise and controllable, and improving the overall efficiency of the system. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of the first embodiment of the electro-hydraulic multi-pump system of the present invention;

[0031] Figure 2 This is a schematic diagram of the structure of a second embodiment of the voltage multi-pump system of the present invention;

[0032] Figure 3 This is a schematic diagram of the third embodiment of the electro-hydraulic multi-pump system of the present invention;

[0033] Figure 4 This is a flowchart illustrating an embodiment of the control method for an electro-hydraulic multi-pump system according to the present invention. Detailed Implementation

[0034] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0035] In the following description, specific details such as particular system architectures, interfaces, and technologies are presented for illustrative purposes rather than for limiting purposes, in order to provide a thorough understanding of this application.

[0036] In this article, the term "and / or" simply describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " generally indicates that the preceding and following related objects have an "or" relationship. Furthermore, "more" in this article means two or more objects.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0038] Before providing a further detailed description of the embodiments of this application, the nouns and terms involved in the embodiments of this application will be explained, and the nouns and terms involved in the embodiments of this application shall be interpreted as follows.

[0039] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] See Figure 1 , Figure 1 This is a schematic diagram of the structure of the first embodiment of the electro-hydraulic multi-pump system of the present invention. The voltage multi-pump system includes at least one control path. This embodiment is described using one control path 100 as an example. Specifically, the control path 100 includes multiple sub-control paths, which are connected in parallel and connected to the first oil outlet 17. Among them, one of the multiple sub-control paths serves as the main control path, and the remaining sub-control paths serve as slave control paths. Figure 1In the illustrated embodiment, three sub-control paths (sub-control path 11, sub-control path 12, and sub-control path 13) are used as an example for explanation. Sub-control path 11 serves as the main control path, while sub-control paths 12 and 13 serve as slave control paths. It should be noted that the main control path generates a traffic allocation strategy based on the total pending traffic issued by the system, while the slave control paths execute the traffic allocation strategy of the main control path.

[0041] Specifically, the main control path (sub-control path 11) is also used to: determine whether the total flow to be processed is greater than the first maximum private flow of the main control path; in response to the total flow to be processed being greater than the first maximum private flow, the main control path provides a portion of the total flow to be processed corresponding to the first maximum private flow through the first oil outlet 17, and uses a chained allocation method to allocate the first portion of the flow exceeding the first maximum private flow to at least one slave control path, so that at least one slave control path provides the first portion of the flow through the first oil outlet 17. In response to the total flow to be processed not being greater than the first maximum private flow, the main control path provides the total flow to be processed through the first oil outlet 17.

[0042] Specifically, if the total flow to be processed is greater than the first maximum private flow of the main control path, then the main control path provides the first maximum private flow through the first oil outlet 17, and uses a chain-like allocation method to distribute the first portion of the flow exceeding the first maximum private flow to the slave control path. If the total flow to be processed is not greater than the first maximum private flow, then the main control path provides the total flow to be processed through the first oil outlet 17.

[0043] It is worth noting that chained allocation uses a sequential allocation method to distribute traffic to multiple control paths, and when each control path distributes traffic, the maximum traffic it provides does not exceed the corresponding maximum private traffic.

[0044] Specifically, the main control path is also used to determine whether the first part of the flow is greater than the second maximum private flow of the first slave control path; in response to the first part of the flow being greater than the second maximum private flow, the corresponding second maximum private flow in the first part of the flow is allocated to the first slave control path, so that the first slave control path provides a portion of the flow in the first part of the flow corresponding to the second maximum private flow through the first oil outlet 17, and the second part of the flow exceeding the second maximum private flow is allocated to the second slave control path, so that the second slave control path provides the second part of the flow through the first oil outlet 17; or, in response to the first part of the flow not being greater than the second maximum private flow, the first slave control path is controlled to provide the first part of the flow through the first oil outlet 17.

[0045] Based on the above, assuming the total traffic to be processed is N, the first maximum private traffic of the master control path is M, and the second maximum private traffic of the first slave control path is S. If N > M, then the master control path provides the first maximum private traffic M, while the first portion of traffic NM is provided by the first slave control path. Further, if NM > S, then the first slave control path provides the second maximum private traffic S, while the second portion of traffic NMS is provided by the second slave control path, and so on. It is understandable that if N ≤ M, then the master control path provides the total traffic to be processed N. If NM ≤ S, then the first slave control path provides NM of traffic.

[0046] In one embodiment of this application, the traffic allocation process can be entirely executed by the master control path. Specifically, the master control path knows the maximum private traffic of all slave control paths and allocates traffic based on the maximum private traffic of all slave control paths. In another embodiment, the traffic allocation process can also be jointly executed by the master control path and slave control paths. Specifically, the master control path determines the traffic it needs to provide based on its first private traffic and assigns the remaining traffic to the first slave control path. The first slave control path attempts to process the allocated traffic. If it cannot process it completely, it determines the traffic it needs to provide based on its second private traffic and assigns the remaining traffic to the second slave control path.

[0047] In one embodiment, each sub-control path includes a drive unit 14 and a power assembly 15 connected to the drive unit 14, the drive unit 14 driving the power assembly 15 to provide a corresponding flow rate. The power assembly 15 includes a pump and a motor M.

[0048] It should be noted that the total flow rate to be processed (L / min) = system maximum flow rate (L / min) × system given flow rate percentage (%). Here, the system maximum flow rate refers to the sum of the maximum flow rates that all pumps (single pump or multi-pump combination) in the entire hydraulic system can output under rated operating conditions. It represents the upper limit of the hydraulic system's flow capacity and is obtained by adding the maximum flow rates of each individual pump. For example, if a hydraulic system consists of N individual pumps, then the system maximum flow rate (L / min) = maximum flow rate of pump 1 (L / min) + maximum flow rate of pump 2 (L / min) + ... + maximum flow rate of pump N (L / min). The system given flow rate percentage is the proportion of the expected flow rate to the system maximum flow rate, set according to actual working requirements. Furthermore, the maximum private flow rate (L / min) = single pump maximum flow rate (L / min) × flow cut-in threshold ratio (%). Here, the maximum private flow rate refers to the maximum flow rate that a single pump can possess or allocate under specific conditions. The maximum flow rate of a single pump (L / min) refers to the maximum volume of oil that a single pump can output per unit time (per minute), and is a key indicator for measuring the flow output capability of an oil pump. The flow cut-off threshold ratio represents the proportion of a single pump allowed to achieve its maximum flow rate under certain rules or control strategies. Further, the maximum flow rate of a single pump (L / min) = maximum speed × pump displacement per revolution / 1000 (L / ml). Here, the maximum speed represents the maximum rotational speed the pump can reach, and it is one of the important parameters affecting the pump's flow output; the higher the speed, the greater the flow rate for a given displacement. Pump displacement per revolution represents the volume of oil discharged per revolution of the pump. 1000 (L / ml) is a unit conversion factor used to convert the pump displacement per revolution from milliliters (ml) to liters (L).

[0049] In one embodiment of this application, in response to the total traffic to be processed exceeding the system's maximum private traffic, the portion of the total traffic to be processed exceeding the system's maximum private traffic is allocated to the slave control path according to a preset ratio; wherein, the system's maximum private traffic is the sum of the maximum private traffic of all sub-control paths (including the master control path and the slave control path). It is understood that if the total traffic to be processed exceeds the system's maximum private traffic, there will be a surplus traffic if the chained allocation method is used. In this case, the surplus traffic is allocated to the master control path and the slave control path using a preset ratio. It is understood that the preset ratio can be determined based on the maximum single-pump traffic of the master control path and the slave control path. The formula “Maximum private flow (L / min) = Maximum flow of a single pump (L / min) × Flow cut-in threshold ratio (%)” shows that the maximum flow of a single pump is greater than the maximum private flow. After chain allocation, each sub-control path (including the main control path and the slave control path) is allocated a flow corresponding to its maximum private flow. At this time, the preset ratio can be determined according to the remaining processable flow (maximum flow of a single pump - maximum private flow), and the remaining flow can be allocated to the main control path and the slave control path according to the preset ratio.

[0050] In the main control path (sub-control path 11), the drive unit 14 is used to receive control parameters issued by the control system, perform flow distribution based on the control parameters, and generate an electric drive signal based on the flow distribution result to drive the motor M at a specified speed and direction to drive the pump to output flow.

[0051] Specifically, the drive unit 14 in the main control path includes a control interface 141. The control interface 141 is used to connect to the control system and to receive first control parameters issued by the control system. The first control parameters include a first flow parameter Q and a first pressure parameter T. The first flow parameter Q represents the total flow to be processed, and the first pressure parameter T represents the power parameter corresponding to the total flow to be processed. The main control path is used to perform flow control based on the first flow parameter Q and the first pressure parameter T. In this embodiment, one control interface 141 is set to receive the first control parameters including the first flow parameter Q and the first pressure parameter T. In another embodiment, two control interfaces 141 can be set separately, with each control interface 141 receiving the first flow parameter Q and the first pressure parameter T respectively. The specific implementation is not limited.

[0052] Understandably, the first flow parameter Q represents the total flow rate to be processed. Specifically, the first flow parameter Q can be a percentage of the system's given flow rate. Therefore, the total flow rate to be processed can be calculated based on the formula "Total flow rate to be processed (L / min) = System maximum flow rate (L / min) × System given flow rate percentage (%)". In one embodiment, the total flow rate to be processed is determined by the control system based on load, system parameters, etc., while the first pressure parameter T is the power parameter issued by the control system to provide the total flow rate to be processed, such as the speed and direction of the drive motor M.

[0053] Furthermore, the drive unit 14 in the main control path also includes a main network interface 142, and the drive unit 14 in the slave control path includes a slave network interface 143. The main network interface 142 is connected to the slave network interface 143. The main control path sends traffic allocation instructions and pressure control instructions to the slave control path through the main network interface 142 and the slave network interface 143, so that the slave control path provides allocated traffic based on the traffic allocation instructions and pressure control instructions.

[0054] Specifically, the drive unit 14 in the main control path receives the total flow rate to be processed and the corresponding power parameters from the control system through the control interface 141. If the drive unit 14 determines that the flow rate to be processed is greater than the first maximum private flow rate, it generates a flow allocation command based on the first portion of the flow rate exceeding the first maximum private flow rate, and generates a pressure control command based on the first portion of the flow rate and the first flow rate parameter Q. The pressure control command is then sent to the slave control path through the main network interface 142 and the slave network interface 143, so that the slave control path provides the allocated flow rate based on the flow allocation command and the pressure control command.

[0055] Furthermore, in the electro-hydraulic multi-pump system of this application, the drive unit 14 in the main control path also includes a first feedback interface 144, and the main control path also includes a first pressure sensor 16. The first pressure sensor 16 is connected to the first oil outlet 17 and the first feedback interface 144, and is used to detect the first pressure signal of the first oil outlet 17, and adjust the first pressure parameter T based on the detected first pressure signal. It can be understood that by using the first pressure sensor 16 to detect the first pressure signal of the first oil outlet 17 in real time and adjust the first pressure parameter T, it is possible to avoid oil backflow caused by insufficient pressure at the first oil outlet 17, or to avoid abnormal flow caused by excessive pressure at the first oil outlet 17.

[0056] Furthermore, each control path also includes a one-way valve 18, which connects the power assembly 15 and the first oil outlet 17. Specifically, the one-way valve 18 connects the motor M and the first oil outlet 17 to prevent oil backflow from damaging the motor M.

[0057] It should be noted that the voltage multi-pump system of this application also includes an oil inlet, which is connected to the pumps. Specifically, the oil inlet is connected to the pump in the main control path and the pump in the slave control path.

[0058] This application's electro-hydraulic multi-pump system proposes a chain-like allocation mechanism. This mechanism prioritizes the flow demand of the main control path, with remaining flow sequentially allocated to the secondary control paths (from 1 to N) until the demand is met. If the sum of the maximum private flow rates of all sub-control paths is insufficient to handle the total flow, the excess flow is proportionally allocated to the sub-control paths. In short, the main control path takes the lead, and after reaching its maximum private flow rate, flow is gradually allocated to the secondary control paths. A clear calculation formula ensures transparency and precision in flow allocation, avoiding errors from empirical adjustments. This solves the flow distribution imbalance problem caused by uneven pump capacity in traditional parallel systems. Priority chain-like allocation maximizes single-pump utilization and reduces redundant energy consumption.

[0059] See Figure 2 , Figure 2 This is a schematic diagram of the structure of a second embodiment of the voltage multi-pump system of the present invention, relative to... Figure 1 With respect to the first embodiment shown, the difference in this embodiment includes: each drive unit 14 in the control path includes a mode switching port 145.

[0060] Specifically, the mode switching port 145 is used for switching operating modes, including parallel flow and split flow. Specifically, in response to receiving an enable signal at the mode switching port 145, the slave control path operates in the first operating mode; in response to receiving an enable / disable signal at the mode switching port, the slave control path operates in the second operating mode. The first and second operating modes are different. In the second operating mode, the slave control path is connected to the first oil outlet 17, providing the flow rate allocated by the main control path through the first oil outlet 17. It can be understood that the second operating mode is parallel flow output, and the first operating mode is split flow output. When the mode switching port 145 receives an enable / disable signal, the slave control path operates in parallel flow output mode. In parallel flow output mode, the operating methods of the main control path and the slave control path are the same as described above. Figure 1 The electro-hydraulic multi-pump system shown operates in the same way, and will not be described again here.

[0061] Furthermore, in this embodiment, each slave control path includes a second oil outlet 19 and a reversing valve 20 connected to the second oil outlet 19; in the second operating mode, the reversing valve 20 controls the slave control path to connect with the first oil outlet 17, so that in the second operating mode, it connects with the main control path as described above. Figure 1 The operating mode shown provides the flow rate corresponding to the total flow rate to be processed from the first oil outlet 17.

[0062] In the first operating mode, the reversing valve 20 controls the connection between the control passage and the second oil outlet 19, so that the control passage provides the corresponding flow rate through the second oil outlet 19. It is worth noting that in the first operating mode, the main control passage provides flow rate from the first oil outlet 17, and the slave control passage provides flow rate from the second oil outlet 19, thus achieving a flow splitting mode between the main control passage and the slave control passage.

[0063] Specifically, in this embodiment, to achieve the flow splitting mode of the first working mode, the drive unit 14 in the main control path and the drive unit 14 in the slave control path also include a network port 146. The network port 146 is connected to the CAN network bus to receive second control parameters. The main control path provides the corresponding flow rate from the first oil outlet 17 based on the second control parameters, and the slave control path provides the corresponding flow rate from the second oil outlet 19 based on the second control parameters. The second control parameters include a second flow rate parameter and a second pressure parameter. The second flow rate parameter represents the flow rate provided by the main control path and the slave control path, and the second pressure parameter represents the power parameter corresponding to the flow rate provided by the main control path and the slave control path. In the flow splitting mode of this embodiment, the second control parameters sent by the control system through the CAN network bus are received via the network port 146, enabling the main control path and the slave control path to provide the corresponding flow rates through the first oil outlet 17 and the second oil outlet 19, respectively.

[0064] Furthermore, the drive unit 14 in the main control path and the drive unit 14 in the slave control path also include a second feedback interface 147. The slave control path also includes a second pressure sensor 21. The second pressure sensor 21 is connected to the second oil outlet 19 and the second feedback interface 147, and is used to detect the second pressure signal of the second oil outlet 19 and adjust the second pressure parameter based on the second pressure signal. By using the second pressure sensor 21 to detect the second pressure signal of the second oil outlet 19 in real time and adjust the second pressure parameter T, it is possible to avoid oil backflow due to insufficient pressure at the second oil outlet 19, or to avoid abnormal flow due to excessive pressure at the second oil outlet 19.

[0065] The electro-hydraulic multi-pump system provided in this embodiment can achieve switching between split flow and parallel flow modes. Existing systems generally use mechanical valves for mode switching, while this embodiment uses electrical signals from network ports for intelligent mode switching, making the switching process simpler and faster.

[0066] Please see Figure 3 , Figure 3 This is a schematic diagram of the third embodiment of the electro-hydraulic multi-pump system of the present invention. The electro-hydraulic multi-pump system of this embodiment includes multiple control paths. Figure 3The following explanation uses an example comprising three control paths (control path 100, control path 200, and control path 300). As shown above, each control path includes multiple sub-control paths. Figure 1 and Figure 2 The illustrated embodiment includes three sub-control paths (sub-control path 11, sub-control path 12, and sub-control path 13). In other embodiments, there may be two or one sub-control paths, and the specific number is not limited.

[0067] In this embodiment of the electro-hydraulic multi-pump system, control path 100 and control path 200 each include two sub-control paths, while control path 300 includes one sub-control path, as an example for explanation. Specifically, each sub-control path includes a state switching port 148, which is disposed on the drive unit 14 of each sub-control path. In response to receiving a switching enable signal, the state switching port 148 controls multiple control paths (control path 100, control path 200, and control path 300) to operate in a third operating mode. In response to receiving a switching disable signal, the state switching port 148 controls multiple control paths (control path 100, control path 200, and control path 300) to operate in a fourth operating mode. The third and fourth operating modes are different. In the third operating mode, one of the multiple sub-control paths in each control path serves as the master control path, and the remaining sub-control paths serve as slave control paths.

[0068] Specifically, when the state switching port 148 receives a switching enable signal, it operates in the third operating mode. In each control path, one of the multiple sub-control paths acts as the master control path, and the remaining sub-control paths act as slave control paths. It can be understood that in the third operating mode, each control path includes one master control path and at least one slave control path; thus, each control path can be configured as described above. Figure 1 or Figure 2 The structure shown. To achieve the above... Figure 1 and Figure 2 The diagram illustrates the flow splitting and paralleling methods. Thus, the electro-hydraulic multi-pump system of this embodiment forms a multi-master, multi-slave system. Since each control path corresponds to a master control path, multiple control paths can execute different commands.

[0069] Furthermore, when the state switching port 148 receives a switching off signal, it operates in the fourth operating mode. In the fourth operating mode, one of the multiple control paths, including all sub-control paths, serves as the master control path, and the remaining sub-control paths serve as slave control paths. Specifically, in the fourth operating mode, there is only one master control path and multiple slave control paths. At this time, the electro-hydraulic multi-pump system can only execute one execution command, and its overall structure is equivalent to... Figure 1 or Figure 2The structure shown.

[0070] It is worth noting that each control path is equipped with an oil outlet. In the third operating mode, each control path includes one main control path and at least one slave control path, allowing flow output from the corresponding oil outlet. In the fourth operating mode, a reversing valve can be used to switch the direction, enabling flow output from the oil outlet connected to the slave control path 100. Furthermore, each sub-control path within each control path can also be equipped with an oil outlet to achieve flow diversion; details will not be elaborated further here.

[0071] like Figure 3 As shown, in this embodiment, the control path 300 is provided with only one sub-control path. In the third working mode, the control path 300 can operate in a single pressure closed-loop mode. The single pressure closed-loop mode is, for example, detecting pressure and adjusting the pressure according to the detected pressure to achieve precise pressure control.

[0072] The electro-hydraulic multi-pump system of this embodiment can realize a multi-master and multi-slave structure, and can dynamically switch between master and slave. When one control path fails, other control paths can be used as replacements, which improves the system's efficiency.

[0073] See Figure 4 , Figure 4 This is a schematic flowchart of an embodiment of the control method for an electro-hydraulic multi-pump system according to the present invention. Specifically, it includes:

[0074] Step S41: Determine whether the total traffic to be processed is greater than the first maximum private traffic of the main control path.

[0075] Step S42: In response to the total flow to be processed being greater than the first maximum private flow, the main control path provides a portion of the total flow to be processed corresponding to the first maximum private flow through the first oil outlet, and uses a chain-like allocation method to allocate the first portion of the flow exceeding the first maximum private flow to at least one slave control path, so that at least one slave control path provides the first portion of the flow through the first oil outlet.

[0076] Specifically, assume the total traffic to be processed is N, the first maximum private traffic is M, and the second maximum private traffic is S. If N > M, the master control path provides the first maximum private traffic M, while the first portion of traffic NM is provided by the first slave control path. Further, if NM > S, the first slave control path provides the second maximum private traffic S, while the second portion of traffic NMS is provided by the second slave control path, and so on. Understandably, if N ≤ M, the master control path provides the total traffic to be processed N. If NM ≤ S, the first slave control path provides NM of traffic.

[0077] In one embodiment of this application, the traffic allocation process can be entirely executed by the master control path. Specifically, the master control path knows the maximum private traffic of all slave control paths and allocates traffic based on the maximum private traffic of all slave control paths. In another embodiment, the traffic allocation process can also be jointly executed by the master control path and slave control paths. Specifically, the master control path determines the traffic it needs to provide based on its first private traffic and assigns the remaining traffic to the first slave control path. The first slave control path attempts to process the allocated traffic. If it cannot process it completely, it determines the traffic it needs to provide based on its second private traffic and assigns the remaining traffic to the second slave control path.

[0078] Furthermore, the control method based on the electro-hydraulic multi-pump system of this application also includes: a first mode switching. Specifically, in response to receiving an enable signal at the mode switching port, the control path operates in a first operating mode; in response to receiving an enable-off signal at the mode switching port, the control path operates in a second operating mode; the first operating mode and the second operating mode are different; wherein, in the second operating mode, the control path is connected to the first oil outlet, and the flow rate allocated by the main control path is provided through the first oil outlet.

[0079] Furthermore, the control method based on the electro-hydraulic multi-pump system of this application also includes: a second mode switching. Specifically, in response to the state switching port receiving a switching enable signal, the multiple control paths are controlled to operate in a third operating mode; in response to the state switching port receiving a switching disable signal, the multiple control paths are controlled to operate in a fourth operating mode; the third operating mode and the fourth operating mode are different; wherein, in the third operating mode, one of the multiple sub-control paths in each control path serves as the master control path, and the remaining sub-control paths serve as slave control paths.

[0080] Specifically, when the state switching port receives a switching enable signal, it operates in the third operating mode. In each control path, one of the multiple sub-control paths acts as the master control path, and the remaining sub-control paths act as slave control paths. It can be understood that in the third operating mode, each control path includes one master control path and at least one slave control path; thus, each control path can be configured as described above. Figure 1 or Figure 2 The structure shown. To achieve the above... Figure 1 and Figure 2 The diagram illustrates the flow splitting and paralleling methods. Thus, the electro-hydraulic multi-pump system of this embodiment forms a multi-master, multi-slave system. Since each control path corresponds to a master control path, multiple control paths can execute different commands.

[0081] Furthermore, when the state switching port receives a switching off signal, it operates in the fourth operating mode. In the fourth operating mode, one of the multiple control paths, including all sub-control paths, serves as the master control path, and the remaining sub-control paths serve as slave control paths. Specifically, in the fourth operating mode, there is only one master control path and multiple slave control paths. At this time, the electro-hydraulic multi-pump system can only execute one execution command, and its overall structure is equivalent to... Figure 1 or Figure 2 The structure shown.

[0082] The control method for the electro-hydraulic multi-pump system in this application proposes a chain-like allocation mechanism. This mechanism prioritizes the flow demand of the main control path, with remaining flow sequentially allocated to the secondary control paths (from 1 to N) until the demand is met. If the sum of the maximum private flow rates of all sub-control paths is insufficient to handle the total flow to be processed, the excess flow rate is proportionally allocated to the sub-control paths. In short, the main control path takes the lead, and after reaching its maximum private flow rate, flow is gradually allocated to the secondary control paths. A clear calculation formula ensures transparency and precision in flow allocation, avoiding errors from empirical adjustments. This solves the problem of flow distribution imbalance caused by uneven pump capacity in traditional parallel systems. Priority chain-like allocation maximizes the utilization rate of individual pumps and reduces redundant energy consumption.

[0083] The control method of the electro-hydraulic multi-pump system of this application can realize the switching between split flow and parallel flow modes. Existing methods generally use mechanical valves for mode switching, while this embodiment uses electrical signals from network ports for intelligent mode switching, making the switching process simpler and faster.

[0084] The control method for the electro-hydraulic multi-pump system of this application can realize a multi-master and multi-slave structure, and can dynamically switch between master and slave. When one of the control paths fails, its specific control path can be used as a replacement, thereby improving the system's efficiency.

[0085] The above are merely embodiments of the present invention and do not limit the scope of patent protection of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. An electro-hydraulic multi-pump system, characterized in that, The electro-hydraulic multi-pump system includes: at least one control path, the control path comprising multiple sub-control paths connected in parallel and connected to a first oil outlet; wherein, one of the multiple sub-control paths serves as a master control path, and the remaining sub-control paths serve as slave control paths; the master control path is used for: Determine whether the total flow to be processed is greater than the first maximum private flow of the main control path; in response to the total flow to be processed being greater than the first maximum private flow, the main control path provides a portion of the total flow to be processed corresponding to the first maximum private flow through the first oil outlet, and uses a chain-like allocation method to allocate the first portion of the flow exceeding the first maximum private flow to at least one of the slave control paths, so that at least one of the slave control paths provides the first portion of the flow through the first oil outlet. The electro-hydraulic multi-pump system includes multiple control paths, each of which includes a state switching port. In response to receiving a switching enable signal at the state switching port, the multiple control paths are controlled to operate in a third operating mode. In response to receiving a switching disable signal at the state switching port, the multiple control paths are controlled to operate in a fourth operating mode. The third operating mode and the fourth operating mode are different. In the third working mode, one of the multiple sub-control paths in each control path serves as the main control path, and the remaining sub-control paths serve as the slave control paths. In the fourth working mode, one of the sub-control paths included in the plurality of control paths serves as the main control path, and the remaining sub-control paths serve as the slave control paths.

2. The electro-hydraulic multi-pump system according to claim 1, characterized in that, The main control path is further configured to: in response to the total flow to be processed not being greater than the first maximum private flow, the main control path provides the total flow to be processed through the first oil outlet.

3. The electro-hydraulic multi-pump system according to claim 1, characterized in that, The main control path is also used for: Determine whether the first portion of the flow is greater than the second maximum private flow of the first slave control path; in response to the first portion of the flow being greater than the second maximum private flow, allocate the second maximum private flow corresponding to the first slave control path in the first portion of the flow, so that the first slave control path provides a portion of the flow corresponding to the second maximum private flow in the first portion of the flow through the first oil outlet; The second portion of the flow exceeding the second maximum private flow is allocated to the second slave control path, so that the second slave control path provides the second portion of the flow through the first oil outlet; Alternatively, in response to the first portion of the flow not being greater than the second maximum private flow, the first control path is controlled to provide the first portion of the flow through the first oil outlet.

4. The electro-hydraulic multi-pump system according to claim 3, characterized in that, In response to the total traffic to be processed being greater than the maximum private traffic of the system, the portion of the total traffic to be processed exceeding the maximum private traffic of the system is allocated to the main control path and the slave control path according to a preset ratio; The maximum private traffic of the system is the sum of the maximum private traffic of all the sub-control paths.

5. The electro-hydraulic multi-pump system according to claim 1, characterized in that, The sub-control path includes a drive unit and a power component connected to the drive unit, the drive unit driving the power component to provide a corresponding flow rate.

6. The electro-hydraulic multi-pump system according to claim 5, characterized in that, The driving unit in the main control path includes a main network interface, and the driving unit in the slave control path includes a slave network interface. The main network interface is connected to the slave network interface. The main control path sends traffic allocation instructions and pressure control instructions to the slave control path through the main network interface and the slave network interface, so that the slave control path provides allocated traffic based on the traffic allocation instructions and the pressure control instructions.

7. The electro-hydraulic multi-pump system according to claim 5, characterized in that, The drive unit in the main control path includes a control interface for connecting to the control system and for receiving a first control parameter issued by the control system. The first control parameter includes a first flow parameter and a first pressure parameter. The first flow parameter represents the total flow to be processed, and the first pressure parameter represents the power parameter corresponding to the total flow to be processed. The main control path is used for flow control based on the first flow parameter and the first pressure parameter.

8. The electro-hydraulic multi-pump system according to claim 7, characterized in that, The drive unit in the main control path includes a first feedback interface, and the main control path also includes a first pressure sensor. The first pressure sensor is connected to the first oil outlet and the first feedback interface, and is used to detect a first pressure signal at the first oil outlet and adjust the first pressure parameter based on the detected first pressure signal.

9. The electro-hydraulic multi-pump system according to claim 5, characterized in that, Each of the control paths further includes a one-way valve, which connects the power unit and the first oil outlet.

10. The electro-hydraulic multi-pump system according to any one of claims 5 to 9, characterized in that, Each drive unit in the control path includes a mode switching port. In response to receiving an enable signal at the mode switching port, the control path operates in a first operating mode. In response to receiving an enable deactivation signal at the mode switching port, the control path operates in a second operating mode. The first operating mode is different from the second operating mode. In the second operating mode, the slave control path is connected to the first oil outlet, and the flow rate allocated by the main control path is provided through the first oil outlet.

11. The electro-hydraulic multi-pump system according to claim 10, characterized in that, Each of the slave control passages includes a second oil outlet and a reversing valve connected to the second oil outlet; in the second operating mode, the reversing valve controls the slave control passage to connect with the first oil outlet; in the first operating mode, the reversing valve controls the slave control passage to connect with the second oil outlet, so that the slave control passage provides the corresponding flow rate through the second oil outlet.

12. The electro-hydraulic multi-pump system according to claim 11, characterized in that, The drive unit in the main control path and the drive unit in the slave control path also include a network port, which is connected to a network bus to receive a second control parameter. The main control path provides a corresponding flow rate from the first oil outlet based on the second control parameter, and the slave control path provides a corresponding flow rate from the second oil outlet based on the second control parameter. The second control parameter includes a second flow rate parameter and a second pressure parameter.

13. The electro-hydraulic multi-pump system according to claim 12, characterized in that, The drive unit in the main control path and the drive unit in the slave control path further include a second feedback interface. The slave control path further includes a second pressure sensor. The second pressure sensor is connected to the second oil outlet and the second feedback interface, and is used to detect the second pressure signal of the second oil outlet and adjust the second pressure parameter based on the second pressure signal.

14. The electro-hydraulic multi-pump system according to claim 1, characterized in that, The multiple control paths are used to execute different commands.

15. A control method based on an electro-hydraulic multi-pump system, characterized in that, The electro-hydraulic multi-pump system includes the electro-hydraulic multi-pump system according to any one of claims 1 to 14, and the control method includes: Determine whether the total traffic to be processed is greater than the first maximum private traffic of the main control path; In response to the total flow to be processed being greater than the first maximum private flow, the main control path provides a portion of the total flow to be processed corresponding to the first maximum private flow through the first oil outlet, and uses a chain-like allocation method to allocate the first portion of the flow exceeding the first maximum private flow to at least one slave control path, so that at least one slave control path provides the first portion of the flow through the first oil outlet. In response to receiving a switching enable signal at the state switching port, the multiple control paths are controlled to operate in the third working mode; In response to the state switching port receiving a switching off signal, the multiple control paths are controlled to operate in the fourth operating mode; The third working mode and the fourth working mode are different. In the third working mode, one of the multiple sub-control channels in each control channel serves as the master control channel, and the remaining sub-control channels serve as the slave control channels. In the fourth working mode, one of all the sub-control channels included in the multiple control channels serves as the master control channel, and the remaining sub-control channels serve as the slave control channels.

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