Control method, system, controller and storage medium for closed center hydraulic system

Abstract

The application discloses a control method, system, controller and storage medium of a closed-center hydraulic system, and the control method comprises the following steps: determining a switching action state according to an input signal of an operating handle and a preset action judgment time length; when the switching action state indicates that the state is in a forward and reverse action fast switching state, a target bypass valve is controlled to perform a switching action pressure relief operation according to a working signal acting on a pilot electromagnetic valve. It can be seen that the application can determine the control direction input by the operating handle through the input signal of the operating handle, so as to judge whether the state is in the forward and reverse action fast switching state, and the flow of the pump port is relieved by the target bypass valve when the state is in the forward and reverse action fast switching state, so that the situation that the pump port is subjected to instantaneous high-pressure impact due to the fast switching of the action direction is avoided, and the service life of the element, the stability and reliability of the closed-center hydraulic system are improved.

Description

Technical Field

[0001] This invention relates to the field of hydraulic control technology, and in particular to a control method, system, controller and storage medium for a closed-center hydraulic system. Background Technology

[0002] Currently, during normal operation, the working devices of construction machinery have forward and reverse motions, such as the forward and reverse movements of the boom / bucket on an excavator. Operators can switch between forward and reverse motions of the working device by controlling the target valve core via a control handle.

[0003] However, in practical applications, when the working device rapidly switches the direction of action back and forth, when the target valve core quickly switches from one direction (forward) to the opposite direction (reverse), due to the responsiveness problem of the pump's own mechanical adjustment mechanism, the target valve core cannot quickly release the flow brought by the hydraulic pump when passing through the closed-center position. This causes frequent instantaneous high-pressure impacts at the pump port, which causes great damage to the components in the closed-center hydraulic system, thereby affecting the service life of the components and reducing the stability and reliability of the closed-center hydraulic system.

[0004] Therefore, how to avoid instantaneous high-pressure impacts at the pump port when rapidly switching the direction of motion, in order to improve the service life of components and the stability and reliability of the closed-center hydraulic system, has become an urgent problem to be solved. Summary of the Invention

[0005] This invention discloses a control method, system, controller, and storage medium for a closed-center hydraulic system. It can avoid instantaneous high-pressure impacts at the pump port when rapidly switching the direction of action, thereby improving the service life of components, the stability and reliability of the closed-center hydraulic system, enhancing the operator's comfort, and saving pump oil energy consumption.

[0006] To achieve the above objectives, in a first aspect, the present invention discloses a control method for a closed-center hydraulic system, the control method comprising: The switching action state is determined based on the input signal from the control handle and the preset action judgment duration; When the switching action state indicates that it is in a rapid switching state between forward and reverse actions, the target bypass valve is controlled to perform a switching action and pressure relief operation according to the working signal acting on the pilot solenoid valve.

[0007] As an optional implementation, in an embodiment of the first aspect of the present invention, the input signal includes a positive input signal and a negative input signal; the step of determining the switching action state based on the input signal of the operating handle and a preset action judgment duration includes: Acquire the positive input signal from the operating handle, and determine the end time of the positive action of the operating handle based on the positive input signal; Within the action judgment time after the end time of the positive action, it is determined whether the reverse input signal has been received; If the reverse input signal is received, it is determined that the switching action state indicates that it is in a rapid switching state between forward and reverse actions.

[0008] As an optional implementation, in an embodiment of the first aspect of the present invention, the working signal includes a positive working signal; the step of controlling the target bypass valve to perform a switching action pressure relief operation according to the working signal acting on the pilot solenoid valve when the switching action state indicates a rapid switching state between positive and negative actions includes: When the switching action state indicates a rapid switching between forward and reverse actions, the forward working signal acting on the pilot solenoid valve is acquired in real time. The current value of the positive working signal is compared with a preset positive working current threshold to obtain the positive working signal comparison result; When the comparison result of the positive working signal indicates that the current value of the positive working signal reaches the positive working current threshold, the control target bypass valve performs a switching action to relieve pressure.

[0009] As an optional implementation, in an embodiment of the first aspect of the present invention, after the control target bypass valve performs a switching operation to relieve pressure, the method further includes: Record the real-time pressure relief duration of the switching action pressure relief operation; The real-time pressure relief duration is compared with a preset target pressure relief duration threshold. When the real-time pressure relief duration reaches the target pressure relief duration threshold, the target bypass valve is controlled to stop the switching action pressure relief operation.

[0010] As an optional implementation, in an embodiment of the first aspect of the present invention, the working signal further includes a reverse working signal; after the control target bypass valve performs a switching action to relieve pressure, the method further includes: During the pressure relief operation of the switching action, the reverse working signal acting on the pilot solenoid valve is acquired in real time; The current value of the reverse working signal is compared with a preset reverse working current threshold to obtain the reverse working signal comparison result. When the comparison result of the reverse working signal indicates that the current value of the reverse working signal reaches the reverse working current threshold, the control target bypass valve stops the switching action and performs pressure relief operation.

[0011] As an optional implementation, in an embodiment of the first aspect of the present invention, after determining the switching action state based on the input signal of the operating handle and a preset action judgment duration, the method further includes: When the switching action state indicates that it is not in the rapid switching state between forward and reverse actions, the target bypass valve is controlled to perform the pressure relief operation according to the preset pressure relief duration.

[0012] Secondly, the present invention discloses a closed-center hydraulic system, the closed-center hydraulic system comprising: The oil supply module is used to pump hydraulic oil; Pilot-operated solenoid valve; The target valve core is connected to the external working device and the oil supply module's pump port oil circuit respectively, and the control end of the target valve core is connected to the pilot solenoid valve oil circuit. The target bypass valve is connected to the oil supply module's pump port and return port oil circuit respectively; The controller is communicatively connected to the pilot solenoid valve, the target valve core, the target bypass valve, and an external operating handle, and is used to execute the control method of the closed-position hydraulic system as described in the first aspect of the present invention.

[0013] Thirdly, this invention discloses an engineering machinery, the engineering machinery comprising: The closed-center hydraulic system as described in the second aspect of the present invention; Working device, the working device being connected to the target valve core oil circuit; An operating handle is communicatively connected to the controller.

[0014] Fourthly, the present invention discloses a hydraulic controller, comprising: At least one memory; At least one processor; At least one computer program; The computer program is stored in the memory, and the processor executes the at least one computer program to implement the control method for the closed-center hydraulic system as described in the first aspect of the invention.

[0015] Fifthly, the present invention discloses a computer-readable storage medium storing computer-executable instructions for causing a computer to perform a control method for a closed-center hydraulic system as described in the first aspect of the present invention.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: The control method, system, controller, and storage medium of the closed-center hydraulic system provided by this invention determine the control direction input by the operating handle through the input signal of the operating handle, thereby determining whether it is in a state of rapid switching between forward and reverse actions. When it is in a state of rapid switching between forward and reverse actions, the flow at the pump port is depressurized by the target bypass valve, thereby avoiding the instantaneous high pressure impact at the pump port caused by rapid switching of action direction, thus improving the service life of components and the stability and reliability of the closed-center hydraulic system. Attached Figure Description

[0017] Figure 1 This is a block diagram of a specific embodiment of the closed-center hydraulic system of the present invention; Figure 2 This is a schematic diagram of a specific embodiment of the closed-center hydraulic system of the present invention; Figure 3 This is a flowchart of the control method for the closed-center hydraulic system in this invention; Figure 4 This is a flowchart illustrating a specific embodiment of the control method for the closed-center hydraulic system in this invention. Figure 5 This is a schematic diagram of a specific embodiment of the hydraulic controller in this invention.

[0018] The meanings of the reference numerals in the attached figures are as follows: Oil supply module 100, pilot solenoid valve 210, target valve core 220, target bypass valve 300, working device 400, controller 510, operating handle 520, processor 601, memory 602, input / output interface 603, communication interface 604, bus 605. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.

[0021] Furthermore, some of the aforementioned terms, besides indicating direction or positional relationships, may also have other meanings. For example, the term "above" may, in certain circumstances, indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0022] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or a communication connection; they can refer to a direct connection or an indirect connection via an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0023] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0024] The technical solution of the present invention will be further described below with reference to the embodiments and accompanying drawings.

[0025] Currently, during normal operation, the working devices of construction machinery have forward and reverse motions, such as the forward and reverse movements of the boom / bucket on an excavator. Operators can switch between forward and reverse motions of the working device by controlling the target valve core via a control handle.

[0026] However, in practical applications, when the working device rapidly switches the direction of action back and forth, when the target valve core quickly switches from one direction (forward) to the opposite direction (reverse), due to the responsiveness problem of the pump's own mechanical adjustment mechanism, the target valve core cannot quickly release the flow brought by the hydraulic pump when passing through the closed-center position. This causes frequent instantaneous high-pressure impacts at the pump port, which causes great damage to the components in the closed-center hydraulic system, thereby affecting the service life of the components and reducing the stability and reliability of the closed-center hydraulic system.

[0027] Therefore, how to avoid instantaneous high-pressure impacts at the pump port when rapidly switching the direction of motion, in order to improve the service life of components and the stability and reliability of the closed-center hydraulic system, has become an urgent problem to be solved.

[0028] In response, this invention discloses a control method, system, controller, and storage medium for a closed-center hydraulic system, which can avoid instantaneous high-pressure impacts at the pump port when rapidly switching the direction of action, thereby improving the service life of components, the stability and reliability of the closed-center hydraulic system, enhancing the operator's comfort, and saving pump oil energy consumption.

[0029] The control method for a closed-center hydraulic system according to an embodiment of the present invention is used to control a closed-center hydraulic system, which is part of engineering machinery. (Refer to...) Figure 1 and Figure 2 The following describes a closed-position hydraulic system and a piece of construction machinery disclosed in an embodiment of the present invention. The closed-position hydraulic system includes: an oil supply module 100, a pilot solenoid valve 210, a target valve core 220, a target bypass valve 300, and a controller 510. The construction machinery includes the aforementioned closed-position hydraulic system, a working device 400, and an operating handle 520. The oil supply module 100 is used to pump hydraulic oil; the target valve core 220 is connected to the pump port of the oil supply module 100 and the oil circuit of the working device 400 of the construction machinery, respectively, and the control end of the target valve core 220 is connected to the oil circuit of the pilot solenoid valve 210. The controller 510 is communicatively connected to the pilot solenoid valve 210, the target valve core 220, the target bypass valve 300, and the operating handle 520 of the construction machinery.

[0030] In this embodiment of the invention, the operator can send control command signals in the form of electrical signals to the pilot solenoid valve 210 via the operating handle 520 to control the opening and closing of the pilot solenoid valve 210. This, in turn, drives the target valve core 220 to switch direction via a pilot hydraulic signal, thereby controlling the direction of the working device 400's actions. The oil inlet of the target bypass valve 300 is located between the pump port of the oil supply module 100 and the target valve core 220, and the oil outlet of the target bypass valve 300 is connected to the oil return port of the oil supply module 100. The signal input terminal of the operating handle 520, the control terminal of the target valve core 220, and the control terminal of the target bypass valve 300 are all communicatively connected to the controller 510. The controller 510 can acquire the signal data from the signal input terminal of the operating handle 520 and the control terminal of the target valve core 220, and can control the opening and closing of the target bypass valve 300 via the corresponding solenoid valve.

[0031] When the operator handle 520 quickly inputs forward and reverse action commands, refer to Figure 2 The target valve core 220 will quickly switch from one direction (forward) to the opposite direction (reverse). At this time, the target valve core 220 cannot quickly release the flow from the hydraulic pump in the oil supply module 100 when it is in the closed neutral position. In response, the controller 510 can execute a control method for a closed neutral position hydraulic system to control the pressure relief of the target bypass valve 300.

[0032] The following section will provide a detailed description of a control method for a closed-position hydraulic system executed by controller 510.

[0033] See Figure 3 , Figure 3 This is a flowchart illustrating a control method for a closed-center hydraulic system disclosed in an embodiment of the present invention. Figure 3 As shown, the method may include the following steps: S101. Determine the switching action state based on the input signal from the operating handle and the preset action judgment duration.

[0034] In this embodiment of the invention, in the closed-position hydraulic system, when the operator inputs a control command signal in the form of an electrical signal through the operating handle 520, the input control command signal needs to be processed by some electronic components for a certain period of time before it can be applied to the pilot solenoid valve 210 to control the switching of the target valve core 220. Therefore, when judging the current operating condition through the input signal of the operating handle 520, it is necessary to distinguish between the actual signal input by the operating handle 520 and the working signal applied to the pilot solenoid valve 210 in order to ensure the accuracy of the operating condition judgment.

[0035] The controller 510 acquires the input signal from the operating handle 520. This input signal is the electrical signal actually input by the operator through the operating handle 520. The input signal can reflect whether the operator is inputting a forward or reverse operation command.

[0036] Furthermore, after the controller 510 determines that the operating handle 520 has input a directional action (i.e., a forward action) through the input signal, it determines within a preset action judgment time whether the operating handle 520 has input a command for an action opposite to the previous direction (i.e., a reverse action), thereby determining the current switching action state. If so, the current switching action state is determined to be a fast switching state between forward and reverse actions; if a command for the same action as the previous direction is input within the preset action judgment time, or if no input command is detected within the preset action judgment time, the current switching action state is determined to be a non-fast switching state between forward and reverse actions.

[0037] S102. When the switching action status indicates that it is in the rapid switching state between forward and reverse actions, the target bypass valve is controlled to perform a switching action and pressure relief operation according to the working signal acting on the pilot solenoid valve.

[0038] In this embodiment of the invention, the working signal is an electrical signal that is actually applied to the pilot solenoid valve 210 after being filtered by electronic components for a certain period of time. After the controller 510 determines that the current switching action state is a rapid switching state between forward and reverse actions, it determines the timing for opening the target bypass valve 300 based on the working signal applied to the pilot solenoid valve 210. When the working signal meets specific conditions, the controller 510 opens the target bypass valve 300 through the corresponding solenoid valve, thereby releasing the high-pressure impact through the target bypass valve 300 and ensuring that there is no high pressure at the pump port of the hydraulic pump in the oil supply module 100.

[0039] As can be seen, the control method of the closed-center hydraulic system of the present invention determines the control direction input by the operating handle 520 through the input signal of the operating handle 520, thereby determining whether it is in a state of rapid switching between forward and reverse actions. When it is in a state of rapid switching between forward and reverse actions, the target bypass valve 300 is used to release the pressure of the pump port flow, thereby avoiding the situation of instantaneous high pressure impact at the pump port due to rapid switching of action direction. This improves the service life of components, the stability and reliability of the closed-center hydraulic system, and saves unreasonable consumption of pump oil energy.

[0040] In an optional embodiment, the input signal includes a positive input signal and a negative input signal; in step S101, determining the switching action state based on the input signal of the operating handle and the preset action judgment duration may include the following steps: Acquire the positive input signal of the operating handle, and determine the end time of the positive action of the operating handle based on the positive input signal; Within the action judgment time after the end of the positive action, determine whether a reverse input signal has been received; If a reverse input signal is received, the switching action status is determined to be in a rapid switching state between forward and reverse actions.

[0041] In this optional embodiment, a positive input signal refers to a signal in which the operating handle 520 inputs a positive action command, and a negative input signal refers to a signal in which the operating handle 520 inputs a negative action command. During the operation of switching directions, the operating handle 520 may reset from the end of the positive or negative direction, and the input current of the operating handle 520 will gradually return to zero; conversely, during the process of pushing the operating handle 520 from the origin position to the positive or negative direction, the input current of the operating handle 520 will gradually increase from zero to a maximum value, and the position of this maximum value corresponds to the end position to which the operating handle 520 is pushed.

[0042] Reference Figure 4After the operator inputs a positive action command via the control handle 520, the controller 510 can acquire and monitor the positive input signal in real time. When the positive input signal returns to zero, it indicates that the operator has stopped inputting positive action commands via the control handle 520, i.e., the control handle 520 is reset. The time point at which the input of the positive action command ends is recorded as the positive action end time point. The controller 510 monitors in real time whether a reverse input signal is received within the action judgment time period after the positive action end time point, i.e., whether the operator has input a reverse action command via the control handle 520.

[0043] When a reverse input signal is received within the action judgment time after the end of the forward action, the controller 510 determines that the current switching action state is a fast switching state between forward and reverse actions. When a forward input signal is received again within the action judgment time after the end of the forward action, or when no current of any input command is detected within the action judgment time, the controller 510 determines that the current switching action state is a non-fast switching state between forward and reverse actions. It is understood that forward and reverse in this embodiment of the invention are only used as relative directional concepts. In actual operation, pushing the handle 520 forward can be considered as either forward or reverse, and the same applies to pushing it backward.

[0044] As can be seen, this optional embodiment can also determine whether the operating handle 520 inputs a reverse action command at the end time of the forward action by using a preset action judgment duration, thereby improving the accuracy of the working condition judgment for quickly switching action directions.

[0045] In an optional embodiment, the working signal includes a positive working signal and a reverse working signal; in step S102, when the switching action state indicates that it is in a rapid switching state between positive and reverse actions, controlling the target bypass valve to perform a switching action pressure relief operation according to the working signal acting on the pilot solenoid valve may include the following steps: When the switching action state indicates a rapid switching between forward and reverse actions, the positive working signal acting on the pilot solenoid valve is acquired in real time. The current value of the positive working signal is compared with the preset positive working current threshold to obtain the positive working signal comparison result. When the comparison result of the positive working signal indicates that the current value of the positive working signal has reached the positive working current threshold, the control target bypass valve performs a switching action to relieve pressure.

[0046] In this optional embodiment, the positive working signal refers to the electrical signal that is actually applied to the pilot solenoid valve 210 after the positive input signal is filtered by the electronic components, and the reverse working signal refers to the electrical signal that is actually applied to the pilot solenoid valve 210 after the reverse input signal is filtered by the electronic components.

[0047] The operating current applied to the target valve core 220, whether forward or reverse, is a delayed signal corresponding to the input current at the operating handle 520. When the input current increases, the corresponding operating current increases with a delay, and when the input current decreases, the corresponding operating current decreases with a delay. When switching between forward and reverse quickly, the operator ends the forward action input and quickly inputs the reverse action. At this time, after the forward operating signal decreases to a specific forward operating current threshold, it will immediately change into an upward-trending reverse operating signal (i.e., the reverse action corresponding to the operating handle 520).

[0048] Reference Figure 4 After determining that the current switching action state is a fast switching state between forward and reverse actions, the controller 510 acquires the forward working signal in real time and monitors the relationship between the current value of the forward working signal and the preset forward working current threshold. That is, it determines whether the comparison result of the forward working signal indicates that the current value of the forward working signal has reached the forward working current threshold.

[0049] When the current value of the positive working signal reaches the positive working current threshold, it indicates that the target valve core 220 has actually reached the closed position. The controller 510 will then send a control signal to open the target bypass valve 300, and return the high pressure impact flow to the oil return port of the oil supply module 100, thereby relieving the high pressure impact generated during rapid action switching.

[0050] As can be seen, this optional embodiment can also determine whether the target valve core 220 has actually reached the closed position by monitoring the relationship between the current value of the positive working signal and the preset positive working current threshold, and control the target bypass valve 300 to release the high pressure impact generated, thereby improving the accuracy of pressure relief control and further enhancing the operator's operating comfort.

[0051] In an optional embodiment, after step S102, the control method for the closed-center hydraulic system may further include the following steps: Record the real-time pressure relief duration of the switching action pressure relief operation; The real-time pressure relief duration is compared with the preset target pressure relief duration threshold. When the real-time pressure relief duration reaches the target pressure relief duration threshold, the target bypass valve is controlled to stop the switching action and pressure relief operation.

[0052] In this optional embodiment, refer to Figure 4After the target bypass valve 300 is opened to relieve the high-pressure impact generated during rapid action switching, the controller 510 records the real-time pressure relief duration, which is the duration of the target bypass valve 300 being open. When the real-time pressure relief duration reaches the preset target pressure relief duration threshold, it indicates that the target valve core 220 has switched to another open position. At this time, the controller 510 controls the target bypass valve 300 to close, thereby stopping the pressure relief operation of the switching action.

[0053] As can be seen, this optional embodiment can also control the conduction time of the target bypass valve 300 by setting a target pressure relief time threshold, thereby further improving the accuracy of pressure relief control.

[0054] In an optional embodiment, after step S102, the control method for the closed-center hydraulic system may further include the following steps: During the pressure relief operation of the switching action, the reverse working signal acting on the pilot solenoid valve is acquired in real time; The current value of the reverse working signal is compared with the preset reverse working current threshold to obtain the reverse working signal comparison result. When the comparison result of the reverse working signal indicates that the current value of the reverse working signal has reached the reverse working current threshold, the control target bypass valve stops switching and depressurizes.

[0055] In an optional embodiment, refer to Figure 4 After the target bypass valve 300 is turned on to relieve the high pressure surge generated during rapid action switching, the controller 510 can also acquire the reverse working signal acting on the pilot solenoid valve 210 in real time. When the current value of the reverse working signal reaches the preset reverse working current threshold, it indicates that the target valve core 220 has switched to another conducting position. At this time, the controller 510 controls the target bypass valve 300 to close, thereby stopping the pressure relief operation of the switching action.

[0056] As can be seen, this optional embodiment can also control the closing time of the target bypass valve 300 by setting a reverse working current threshold, thereby further improving the accuracy of pressure relief control.

[0057] In an optional embodiment, after step S101, the control method for the closed-position hydraulic system may further include the following steps: When the switching action status indicates that it is not in the rapid switching state between forward and reverse actions, the target bypass valve is controlled to perform the auxiliary pressure relief operation according to the preset auxiliary pressure relief duration.

[0058] In this optional embodiment, refer to Figure 4If the controller 510 determines that the current switching action is a non-forward / reverse rapid switching state, the target valve core 220 will close. Due to the mechanical design of the hydraulic pump, the time it takes for the hydraulic pump to return to its minimum displacement is longer than the closing time of the target valve core 220. Therefore, a certain high-pressure impact will occur at the pump port. At this time, the controller 510 can control the target bypass valve 300 to open, so as to perform a preset auxiliary pressure relief operation at the pump port, thereby ensuring that high pressure does not form at the pump port. It can be understood that since the high-pressure impact duration caused by the mechanical structure of the hydraulic pump is shorter than the high-pressure impact duration caused by the rapid switching action, the auxiliary pressure relief duration is set to be less than the target pressure relief duration threshold of the above embodiment.

[0059] As can be seen, this optional embodiment can also briefly open the target bypass valve 300 when it is not in a state of rapid switching between forward and reverse actions, so as to avoid high pressure impact caused by the mechanical structure design of the hydraulic pump, thereby further improving the stability and reliability of the closed-center hydraulic system.

[0060] like Figure 5 As shown, this embodiment of the invention also discloses a hydraulic controller, which includes: The processor 601 can be implemented using a general-purpose central processing unit (CPU), microprocessor, application specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of this disclosure. The memory 602 can be implemented as a read-only memory (ROM), static storage device, dynamic storage device, or random access memory (RAM). The memory 602 can store the operating system and other application programs. When the technical solutions provided in the embodiments of this specification are implemented through software or firmware, the relevant program code is stored in the memory 602 and is called by the processor 601 to execute some or all of the steps performed in the control method of the closed-center hydraulic system described in the above embodiments of the present invention. The input / output interface 603 is used to implement information input and output; The communication interface 604 is used to enable communication and interaction between this device and other devices. Communication can be achieved through wired means (such as USB, network cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.). Bus 605 transmits information between various components of the device (e.g., processor 601, memory 602, input / output interface 603, and communication interface 604); The processor 601, memory 602, input / output interface 603, and communication interface 604 are connected to each other within the device via bus 605.

[0061] This invention also discloses a computer storage medium storing computer-executable instructions. When these computer instructions are invoked, they are used to execute some or all of the steps performed in the control method of the closed-center hydraulic system described in the above embodiments of this invention.

[0062] The technical means disclosed in this invention are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications are also considered within the scope of protection of this invention.

Claims

1. A control method for a closed-center hydraulic system, characterized in that, The control method for the closed-center hydraulic system includes: The switching action state is determined based on the input signal from the control handle and the preset action judgment duration; When the switching action state indicates that it is in a rapid switching state between forward and reverse actions, the target bypass valve is controlled to perform a switching action and pressure relief operation according to the working signal acting on the pilot solenoid valve.

2. The control method for the closed-center hydraulic system according to claim 1, characterized in that, The input signals include positive input signals and negative input signals; the step of determining the switching action state based on the input signals from the operating handle and a preset action judgment duration includes: Acquire the positive input signal from the operating handle, and determine the end time of the positive action of the operating handle based on the positive input signal; Within the action judgment time after the end time of the positive action, it is determined whether the reverse input signal has been received; If the reverse input signal is received, it is determined that the switching action state indicates that it is in a rapid switching state between forward and reverse actions.

3. The control method for the closed-center hydraulic system according to claim 2, characterized in that, The working signal includes a positive working signal; when the switching action state indicates a rapid switching state between positive and negative actions, the target bypass valve is controlled to perform a switching action pressure relief operation based on the working signal acting on the pilot solenoid valve, including: When the switching action state indicates a rapid switching between forward and reverse actions, the forward working signal acting on the pilot solenoid valve is acquired in real time. The current value of the positive working signal is compared with a preset positive working current threshold to obtain the positive working signal comparison result; When the comparison result of the positive working signal indicates that the current value of the positive working signal reaches the positive working current threshold, the control target bypass valve performs a switching action to relieve pressure.

4. The control method for the closed-center hydraulic system according to claim 3, characterized in that, After the bypass valve controlling the target performs a switching action to relieve pressure, the method further includes: Record the real-time pressure relief duration of the switching action pressure relief operation; The real-time pressure relief duration is compared with a preset target pressure relief duration threshold. When the real-time pressure relief duration reaches the target pressure relief duration threshold, the target bypass valve is controlled to stop the switching action pressure relief operation.

5. The control method for the closed-center hydraulic system according to claim 3, characterized in that, The working signal also includes a reverse working signal; after the control target bypass valve performs a switching action to relieve pressure, the method further includes: During the pressure relief operation of the switching action, the reverse working signal acting on the pilot solenoid valve is acquired in real time; The current value of the reverse working signal is compared with a preset reverse working current threshold to obtain the reverse working signal comparison result. When the comparison result of the reverse working signal indicates that the current value of the reverse working signal reaches the reverse working current threshold, the control target bypass valve stops the switching action and performs pressure relief operation.

6. The control method for a closed-center hydraulic system according to any one of claims 2 to 5, characterized in that, After determining the switching action state based on the input signal from the operating handle and the preset action judgment duration, the method further includes: When the switching action state indicates that it is not in the rapid switching state between forward and reverse actions, the target bypass valve is controlled to perform the pressure relief operation according to the preset pressure relief duration.

7. A closed-center hydraulic system, characterized in that, The closed-center hydraulic system includes: The oil supply module is used to pump hydraulic oil; Pilot-operated solenoid valve; The target valve core is connected to the external working device and the oil supply module's pump port oil circuit respectively, and the control end of the target valve core is connected to the pilot solenoid valve oil circuit. The target bypass valve is connected to the oil supply module's pump port and return port oil circuit respectively; The controller is communicatively connected to the pilot solenoid valve, the target valve core, the target bypass valve, and an external operating handle, and is used to execute the control method of the closed-center hydraulic system as described in any one of claims 1 to 6.

8. An engineering machinery, characterized in that, The engineering machinery includes: The closed-center hydraulic system as described in claim 7; Working device, the working device being connected to the target valve core oil circuit; An operating handle is communicatively connected to the controller.

9. A hydraulic controller, characterized in that, include: At least one memory; At least one processor; At least one computer program; The computer program is stored in the memory, and the processor executes the at least one computer program to implement the control method for the closed-center hydraulic system as described in any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions for causing a computer to perform the control method of the closed-center hydraulic system as described in any one of claims 1 to 6.

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