Control Method, Controller and Hydraulic Control System for Electro-Hydraulic Proportioning Pump

Abstract

This application relates to the field of engineering vehicles, and particularly to a control method, a controller and a hydraulic control system for an electro-proportional pump. The method includes: receiving and outputting a first control instruction for a multi-way valve assembly; determining an expected demand flow value of the multi-way valve assembly according to the first control instruction; outputting a first current signal to the electro-proportional pump according to the expected demand flow value to adjust a first output flow of the electro-proportional pump; receiving a spool displacement signal of a load flow valve, where the spool displacement signal is sent when the spool of the load flow valve is displaced when the pressure difference between the oil inlet of the load flow valve and the pressure at the load feedback oil port is greater than a preset pressure; sending a second current signal to the electro-proportional pump according to the spool position carried in the spool displacement signal to adjust a second output flow of the electro-proportional pump so that the pressure difference is less than or equal to the preset pressure.

Description

Technical Field

[0001] The present application relates to the field of engineering vehicles, and particularly to a control method for an electro-proportional pump, a controller, a hydraulic control system, an engineering vehicle, and a storage medium. Background Art

[0002] The actuators in engineering vehicles are usually powered by hydraulic pumps. After the hydraulic oil passes through the hydraulic pump, it is converted into high-pressure hydraulic oil and transported to the multi-way valve assembly. The user controls the spool of the multi-way valve assembly to control the actuators of the engineering vehicle.

[0003] In the prior art, there are three types of hydraulic pumps commonly used in the multi-way valve control system of engineering vehicles: fixed-displacement pumps, load-sensing pumps, and electro-proportional pumps. The fixed-displacement pump outputs a fixed amount of hydraulic oil and cannot adjust its own hydraulic oil output according to the pressure and flow requirements of the actuator. Therefore, it usually outputs more hydraulic oil, resulting in excessive energy loss and increased fuel consumption. The load-sensing pump can determine the required flow rate of the hydraulic control system based on the feedback of the hydraulic control system to adjust its own hydraulic oil output. However, the hydraulic channel between the load-sensing pump and the actuator is too long, and the obtained feedback is inaccurate. Therefore, it still causes relatively large energy loss. When an electro-proportional pump is applied to a multi-way valve system, it usually needs to cooperate with a three-way flow valve. The electro-proportional pump can determine the required flow rate of the multi-way valve by obtaining the current of the main valve of the multi-way valve, output the required flow rate of the multi-way valve, and transmit the excess flow rate to the three-way flow valve to return to the hydraulic oil tank.

[0004] Both the fixed-displacement pump and the load-sensing pump have relatively large energy losses and are difficult to improve. The output flow rate determined by the electro-proportional pump based on the current of the main valve of the multi-way valve also has a relatively large error, which may lead to excessive output flow rate and cause energy waste. Summary of the Invention

[0005] The purpose of the embodiments of the present application is to provide a control method for an electro-proportional pump, a controller, a hydraulic control system, an engineering vehicle, and a storage medium.

[0006] To achieve the above purpose, the first aspect of the present application provides a control method for an electro-proportional pump, which is applied to a hydraulic control system. The hydraulic control system includes an electro-proportional pump, a load flow valve, a multi-way valve assembly, and a hydraulic oil tank. The hydraulic oil tank is connected to the electro-proportional pump. The load flow valve includes a load flow valve inlet, a load flow valve outlet, and a load feedback oil port. The electro-proportional pump is connected to the load flow valve inlet and the inlet of the multi-way valve assembly. The load feedback oil port is connected to the pressure feedback oil port of the multi-way valve assembly; the method includes:

[0007] Receiving and outputting a first control instruction for the multi-way valve assembly;

[0008] Determining a predicted required flow rate value of the multi-way valve assembly according to the first control instruction;

[0009] Output a first current signal to the electro-hydraulic proportional pump according to the predicted demand flow value to adjust the first output flow of the electro-hydraulic proportional pump;

[0010] Receive the spool displacement signal of the load flow valve, which is sent when the spool of the load flow valve is displaced when the pressure difference between the oil inlet of the load flow valve and the pressure at the load feedback oil port is greater than a preset pressure;

[0011] Send a second current signal to the electro-hydraulic proportional pump according to the spool position carried in the spool displacement signal to adjust the second output flow of the electro-hydraulic proportional pump so that the pressure difference is less than or equal to the preset pressure.

[0012] In the embodiment of the present application, the load flow valve includes a displacement sensor. Receiving the spool displacement signal of the load flow valve includes: when the pressure difference is greater than the preset pressure, the spool of the load flow valve moves; determining the moving distance of the spool of the load flow valve through the displacement sensor; receiving the spool displacement signal sent by the displacement sensor according to the moving distance.

[0013] In the embodiment of the present application, the load flow valve includes a proportional electro-magnet, the multi-way valve assembly includes multiple multi-way valves, and each multi-way valve includes at least one fixed differential pressure reducing valve. The control method further includes: determining the working multi-way valve in the multi-way valve assembly according to the first control instruction, where the working multi-way valve is one or more; obtaining the maximum pressure difference setting value of the fixed differential pressure reducing valve in the working multi-way valve; determining the preset pressure according to the maximum pressure difference setting value; outputting a third current signal to the proportional electro-magnet of the load flow valve according to the preset pressure so that the starting pressure of the proportional electro-magnet is adjusted to the preset pressure.

[0014] In the embodiment of the present application, the hydraulic control system further includes a remote control device, the load flow valve includes a proportional electro-magnet, the multi-way valve assembly includes multiple multi-way valves, and each multi-way valve includes at least one fixed differential pressure reducing valve. The control method further includes: determining the working multi-way valve in the multi-way valve assembly according to the first control instruction, where the working multi-way valve is one or more; obtaining the maximum pressure difference setting value of the fixed differential pressure reducing valve in the working multi-way valve; receiving a second control instruction for the load flow valve output by the user through the remote control device; determining the preset pressure according to the maximum pressure difference setting value and the second control instruction; outputting a third current signal to the proportional electro-magnet of the load flow valve according to the preset pressure so that the starting pressure of the proportional electro-magnet is adjusted to the preset pressure.

[0015] In the embodiment of the present application, the multi-way valve assembly includes multiple multi-way valves. Determining the predicted demand flow value of the multi-way valve assembly according to the first control instruction includes: determining the working multi-way valve in the multi-way valve assembly and the spool opening of each working multi-way valve according to the first control instruction; determining the predicted demand flow value of the multi-way valve assembly according to the working multi-way valve and the spool opening of each working multi-way valve.

[0016] In an embodiment of the present application, when the spool of the load flow valve moves, the oil inlet of the load flow valve is communicated with the oil outlet of the load flow valve, and the hydraulic oil at the oil inlet of the load flow valve flows into the hydraulic oil tank through the oil outlet of the load flow valve to limit the hydraulic oil pressure of the hydraulic control system and protect the hydraulic components of the hydraulic control system.

[0017] In an embodiment of the present application, the hydraulic control system further includes a remote control device, and receiving and outputting a first control instruction for the multi-way valve assembly includes: receiving and outputting a first control instruction for the multi-way valve assembly input by a user through the remote control device.

[0018] A second aspect of the present application provides a controller configured to execute the above control method for an electro-hydraulic pump.

[0019] A third aspect of the present application provides a hydraulic control system, the system includes a hydraulic oil tank; an electro-hydraulic pump electrically connected to the controller for outputting high-pressure hydraulic oil for the hydraulic control system; a multi-way valve assembly connected to the load feedback oil port and the actuator of the load flow valve for controlling the actuator to work and feedbacking the load pressure to the load feedback oil port; a load flow valve, the load flow valve includes a load flow valve oil inlet, a load flow valve oil outlet and a load feedback oil port, the load flow valve oil inlet is connected to the electro-hydraulic pump, the load flow valve oil outlet is connected to the hydraulic oil tank, the load flow valve is electrically connected to the controller for sending a spool displacement signal of the load flow valve to the controller when the difference between the output pressure of the electro-hydraulic pump and the load pressure is greater than a preset pressure; and the controller according to the above.

[0020] In an embodiment of the present application, the load flow valve further includes a displacement sensor for determining the spool displacement distance of the load flow valve and sending a spool displacement signal to the controller.

[0021] In an embodiment of the present application, the load flow valve further includes a proportional electromagnet for adjusting the starting pressure of the proportional electromagnet to a preset pressure according to a third current signal input by the controller.

[0022] In an embodiment of the present application, the hydraulic control system further includes: a remote control device electrically connected to the controller for triggering a first control instruction for the multi-way valve assembly according to the user's use and sending it to the controller.

[0023] In an embodiment of the present application, the remote control device is further configured to trigger a second control instruction for the load flow valve according to the user's use and send it to the controller.

[0024] A fourth aspect of the present application provides an engineering vehicle including the above hydraulic control system.

[0025] A fifth aspect of the present application provides a machine-readable storage medium, on which instructions are stored. It is characterized in that when the instructions are executed by a processor, the processor is configured to execute the control method for an electro-hydraulic proportional pump according to the above.

[0026] Through the above technical solution, the controller can determine that the output flow rate of the electro-hydraulic proportional pump is greater than the required flow rate through the spool displacement signal of the load flow valve, and the controller can timely adjust the output flow rate of the electro-hydraulic proportional pump to reduce energy waste.

[0027] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent specific implementation part. Description of the Drawings

[0028] The drawings are used to provide a further understanding of the embodiments of the present application, and constitute a part of the specification. Together with the following specific implementation, they are used to explain the embodiments of the present application, but do not constitute a limitation to the embodiments of the present application. In the drawings:

[0029] Figure 1 Schematically shows a flowchart of the control method for an electro-hydraulic proportional pump according to an embodiment of the present application;

[0030] Figure 2 Schematically shows a schematic diagram of a hydraulic control system according to an embodiment of the present application;

[0031] Figure 3 Schematically shows a partially enlarged view of the schematic diagram of the hydraulic control system according to an embodiment of the present application;

[0032] Figure 4 Schematically shows the internal structure diagram of a computer device according to an embodiment of the present application.

[0033] Reference Signs

[0034] 201 Electro-hydraulic proportional pump 202 Load flow valve

[0035] 202P Inlet port of the load flow valve 202T Outlet port of the load flow valve

[0036] 202R Load feedback oil port 203 Multi-way valve assembly

[0037] 203R Pressure feedback oil port 204 Hydraulic oil tank

[0038] 205 Controller 206 Remote control device Detailed Description of the Invention

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It should be understood that the specific implementation manners described herein are only for explaining and illustrating the embodiments of the present application, and are not used to limit the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts belong to the scope of protection of the present application.

[0040] Figure 1 Schematically shows a flowchart of a control method for an electro-proportional pump according to an embodiment of the present application. As Figure 1 shown, in an embodiment of the present application, a control method for an electro-proportional pump is provided. By way of example, the method includes the following steps:

[0041] S102, Receive a first control instruction for a multi-way valve assembly.

[0042] S104, Determine an expected demand flow rate value of the multi-way valve assembly according to the first control instruction.

[0043] S106, Output a first current signal to the electro-proportional pump according to the expected demand flow rate value to adjust the first output flow rate of the electro-proportional pump.

[0044] S108, Receive a spool displacement signal of a load flow valve, where the spool displacement signal is sent when the spool of the load flow valve is displaced when the pressure difference between the oil inlet of the load flow valve and the pressure at the load feedback oil port is greater than a preset pressure.

[0045] S110, Send a second current signal to the electro-proportional pump according to the spool position carried in the spool displacement signal to adjust the second output flow rate of the electro-proportional pump so that the pressure difference is less than or equal to the preset pressure.

[0046] The actuators of the construction vehicle are controlled by a controller. The controller can output a first control command to adjust the opening degree of the spool of the main valve of the multi-way valve, thereby adjusting the opening degree of each actuator. At different opening degrees of the main valve spool, different hydraulic oil flow rates are required. The controller can also determine the required flow rate value of the multi-way valve assembly according to the first control command, and the controller adjusts the first current signal of the electro-hydraulic pump according to the required flow rate value. The output flow rate of the electro-hydraulic pump is controlled by the current. The current received by the electro-hydraulic pump is positively correlated with the hydraulic oil flow rate output by the electro-hydraulic pump. However, the hydraulic oil flow rate output by the electro-hydraulic pump will be lost through the hydraulic control system, and there will also be errors in the output flow rate of the electro-hydraulic pump. Therefore, it is necessary to adjust the output flow rate of the electro-hydraulic pump. The multi-way valve assembly includes multiple multi-way valves, and each multi-way valve has at least one main valve and at least one fixed differential pressure reducing valve. The multi-way valve assembly can determine the difference between the inlet pressure value of each multi-way valve and the pressure value of the fixed differential pressure reducing valve of each multi-way valve, and determine the maximum value of the difference in each multi-way valve and feedback it to the load flow valve. The load flow valve can obtain the first hydraulic oil pressure value fed back by the multi-way valve assembly and the second hydraulic oil pressure value delivered by the electro-hydraulic pump, and determine the difference between the first hydraulic oil pressure value and the second hydraulic oil pressure value. When the difference is greater than the preset pressure value of the load flow valve, the spool of the load flow valve will move, indicating that the output flow rate of the electro-hydraulic pump is greater than the required flow rate of the multi-way valve assembly. The spool displacement signal is fed back to the controller, and the controller can adjust the output flow rate of the electro-hydraulic pump.

[0047] Specifically, such as Figure 2As shown in the figure, it is a schematic diagram of the hydraulic control system according to the embodiment of the present application. The hydraulic control system includes an electro-hydraulic proportional pump 201, a load flow valve 202, a multi-way valve assembly 203, and a hydraulic oil tank 204. The hydraulic oil tank 204 is connected to the electro-hydraulic proportional pump 201. The load flow valve 202 includes a load flow valve inlet 202P, a load flow valve outlet 202T, and a load feedback oil port 202R. The electro-hydraulic proportional pump 201 is connected to the load flow valve inlet 202P and the inlet of the multi-way valve assembly 203. The load feedback oil port 202R is connected to the pressure feedback oil port 203R of the multi-way valve assembly 203. First, the controller 205 can receive a first control instruction for the multi-way valve assembly 203 and output the first control instruction to the multi-way valve assembly 203. After receiving the first control instruction, the multi-way valve assembly 203 will adjust the spool opening of the multi-way valve main valve to control the actuator to work. The controller 205 can determine the expected demand flow value of the electro-hydraulic proportional pump 201 according to the first control instruction, and output a first current signal to the electro-hydraulic proportional pump 201 according to the expected demand flow value to adjust the first output flow of the electro-hydraulic proportional pump 201. The multi-way valve assembly 203 can feedback the first hydraulic oil pressure value to the load feedback oil port 202R through the pressure feedback oil port 203R. The load flow valve inlet 202P can determine the second hydraulic oil pressure value output by the electro-hydraulic proportional pump 201. When the first hydraulic oil pressure value is greater than the preset pressure of the second hydraulic oil pressure value, the spool of the load flow valve 202 will displace. The controller 205 can receive the spool displacement signal of the load flow valve 202, and determine whether the first output flow of the electro-hydraulic proportional pump 201 is too large according to the spool position carried in the spool displacement signal, output a second current signal to the electro-hydraulic proportional pump 201 to adjust the output flow of the electro-hydraulic proportional pump 201, and output a second flow to the hydraulic control system to make the pressure difference less than or equal to the preset pressure.

[0048] Through the above method, the controller 205 can determine that the output flow of the electro-hydraulic proportional pump 201 is greater than the demand flow through the spool displacement signal of the load flow valve 202, and the controller 205 can timely adjust the output flow of the electro-hydraulic proportional pump 201 to reduce energy waste.

[0049] In one embodiment, as Figure 2As shown in the figure, the hydraulic control system includes a hydraulic oil tank 204; an electro-hydraulic proportional pump 201, electrically connected to a controller 205, for outputting high-pressure hydraulic oil to the hydraulic control system; a multi-way valve assembly 203, connected to a load feedback oil port 202R of a load flow valve 202 and an actuator, for controlling the actuator to work and feedbacking the load pressure to the load feedback oil port 202R; a load flow valve 202, the load flow valve 202 includes a load flow valve inlet 202P, a load flow valve outlet 202T, and a load feedback oil port 202R, the load flow valve inlet 202P is connected to the electro-hydraulic proportional pump 201, the load flow valve outlet 202T is connected to the hydraulic oil tank 204, and the load flow valve 202 is electrically connected to the controller 205, for sending a spool displacement signal of the load flow valve 202 to the controller 205 when the difference between the output pressure of the electro-hydraulic proportional pump 201 and the load pressure is greater than a preset pressure; and the controller 205 according to the above.

[0050] In one embodiment, the load flow valve 202 further includes a displacement sensor (not shown in the figure), and the displacement sensor is used to determine the spool displacement distance of the load flow valve 202 and send the spool displacement signal to the controller 205. After the spool of the load flow valve 202 is displaced, the displacement sensor of the load flow valve 202 can determine the spool displacement distance of the load flow valve 202 and send the displacement signal to the controller 205. The controller 205 can determine whether the spool of the load flow valve 202 moves according to the displacement signal, and further determine whether the first output flow rate of the electro-hydraulic proportional pump 201 needs to be adjusted.

[0051] In one embodiment, the load flow valve 202 further includes a proportional electromagnet, and the proportional electromagnet is used to adjust the starting pressure of the proportional electromagnet to a preset pressure according to a third current signal input by the controller 205.

[0052] In one embodiment, the load flow valve 202 includes a proportional electromagnet (not shown in the figure), the multi-way valve assembly 203 includes a multi-section multi-way valve, and each section of the multi-way valve includes at least one fixed-differential pressure reducing valve. The control method further includes: determining the working multi-way valve in the multi-way valve assembly 203 according to a first control instruction, and the working multi-way valve is one or more; obtaining the maximum differential pressure setting value of the fixed-differential pressure reducing valve in the working multi-way valve; determining the preset pressure according to the maximum differential pressure setting value; outputting a third current signal to the proportional electromagnet of the load flow valve 202 according to the preset pressure, so that the starting pressure of the proportional electromagnet is adjusted to the preset pressure. The proportional electromagnet is a device that can adjust the opening pressure according to the input current value. In the embodiment of the present application, the controller 205 inputs a third current signal to the proportional electromagnet so that the starting pressure of the proportional electromagnet is the preset pressure. When the first hydraulic oil pressure value is greater than the second hydraulic oil pressure value preset pressure, the proportional electromagnet starts and the spool starts to displace.

[0053] The multi-way valve assembly 203 includes a multi-section multi-way valve for controlling the movement of different actuators. The controller 205 can control the opening degree of the spool of the main valve of the multi-way valve according to the first control instruction, and then control the actuator to work. Each section of the multi-way valve includes at least one constant differential pressure reducing valve, which can keep the pressure difference between the inlet and outlet of the actuator constant to meet the need for the smooth movement of the actuator. The larger the pressure value of the constant differential pressure reducing valve, it indicates that the required pressure difference of this section of the multi-way valve is large and the required flow rate is large. Among them, the sum of the maximum differential pressure setting value of the constant differential pressure reducing valve in the multi-section multi-way valve and the load feedback oil port 202R of the load flow valve 202 fed back is the pressure value of the oil inlet of the multi-way valve assembly 203. When the output hydraulic oil flow rate of the electro-hydraulic proportional pump 201 is greater than the required flow rate, the output hydraulic oil pressure value of the electro-hydraulic proportional pump 201 increases, and the pressure of the oil inlet 202P of the load flow valve also increases. When the pressure of the oil inlet 202P of the load flow valve is greater than the preset pressure of the load feedback oil port 202R, the spool moves, the controller 205 obtains the spool movement signal, and adjusts the output flow rate of the electro-hydraulic proportional pump 201 by adjusting the current of the electro-hydraulic proportional pump 201.

[0054] The controller 205 can determine the multi-way valve working in the multi-way valve assembly 203 according to the first control signal, and then can determine the differential pressure setting value of the constant differential pressure reducing valve in each working multi-way valve. The controller 205 can determine the maximum differential pressure setting value among multiple constant differential pressure reducing valves. The controller 205 can determine the preset pressure according to the maximum differential pressure setting value, and determine the starting pressure of the proportional electromagnet according to the preset pressure. The starting pressure of the proportional electromagnet corresponds to the maximum differential pressure setting value of the constant differential pressure reducing valve of the working multi-way valve. After determining the maximum differential pressure setting value of the constant differential pressure reducing valve, the controller 205 can increase the preset loss value to determine the preset pressure, and output a third current signal to the proportional electromagnet of the load flow valve 202 to make the starting pressure of the proportional electromagnet the preset pressure.

[0055] For example, the controller 205 determines that the working multi-way valves are multi-way valve A and multi-way valve B according to the first control instruction. The processor can determine that the pressure value of the constant differential pressure reducing valve of multi-way valve A is X, and the pressure value of multi-way valve B is Y. X is greater than Y. Therefore, the maximum differential pressure setting value of the constant differential pressure reducing valve is X. The controller 205 can determine the preset pressure as (X + Z) according to the maximum differential pressure setting value X of the constant differential pressure reducing valve and the preset loss Z. The controller 205 outputs a third current signal to the proportional electromagnet of the load flow valve 202 to make the opening pressure of the proportional electromagnet (X + Z).

[0056] In one embodiment, the hydraulic control system further includes a remote control device 206, which is electrically connected to the controller 205 and is used to trigger a second control instruction for the load flow valve 202 according to the user's operation and send it to the controller 205.

[0057] In one embodiment, the hydraulic control system further includes a remote control device 206, electrically connected to the controller 205. The load flow valve 202 includes a proportional electromagnet, and the multi-way valve assembly 203 includes a multi-section multi-way valve. Each section of the multi-way valve includes at least one constant differential pressure reducing valve. The control method further includes: determining the working multi-way valve in the multi-way valve assembly 203 according to a first control instruction, where the working multi-way valve is one or more; obtaining the maximum differential pressure setting value of the constant differential pressure reducing valve in the working multi-way valve; receiving a second control instruction for the load flow valve 202 output by the user through the remote control device 206; determining a preset pressure according to the maximum differential pressure setting value and the second control instruction; and outputting a third current signal to the proportional electromagnet of the load flow valve 202 according to the preset pressure, so that the starting pressure of the proportional electromagnet is adjusted to the preset pressure. The second control instruction output by the user through the remote control device 206 may be a pressure value, and the controller 205 determines the preset pressure value according to the sum of the pressure value and the maximum differential pressure setting value. During the use of the hydraulic control system, there may be situations such as wear, inaccurate output flow of the electro-hydraulic pump 201, and high viscosity of the hydraulic oil at low temperature, resulting in large fluctuations in the energy loss value of the hydraulic oil in the hydraulic control system. The user can output a second control signal to adjust the preset pressure of the load flow valve 202 to avoid inaccurate output flow of the electro-hydraulic pump 201 and insufficient differential pressure of the actuator, which may cause slow movement of the actuator.

[0058] For example, the working temperature of the engineering vehicle drops suddenly, resulting in an increase in the viscosity of the hydraulic oil inside the engineering machinery, an increase in the loss of the hydraulic oil in the hydraulic control system, and slow movement of the actuator of the engineering machinery. The user can input a second control instruction to increase the pressure value of the preset pressure, so as to increase the opening pressure of the proportional electromagnet. By this method, it is possible to prevent the load flow valve 202 from moving when the pressure of the multi-way valve assembly 203 is insufficient, resulting in a situation where the differential pressure between the inlet and outlet of the actuator cannot reach the pressure value of the constant differential pressure reducing valve, causing slow movement of the actuator.

[0059] In one embodiment, the remote control device 206 is further configured to trigger a first control instruction for the multi-way valve assembly 203 according to the user's operation and send it to the controller 205.

[0060] In one embodiment, receiving and outputting a first control instruction for the multi-way valve assembly 203 includes: receiving and outputting a first control instruction for the multi-way valve assembly 203 input by a user through the remote control device 206. The user can output a first control instruction for the multi-way valve assembly 203 through the remote control device 206. After the controller 205 receives the first control instruction, it outputs the first control instruction to the multi-way valve assembly 203. The multi-way valve assembly 203 adjusts the opening degree of the valve core in the multi-way valve assembly 203 according to the first control instruction to control the corresponding actuator to work. For example, the user outputs an instruction for the actuator C to rise rapidly through the remote control device 206. The controller 205 outputs this instruction to the multi-way valve bank D corresponding to the actuator C. The multi-way valve bank D can adjust the main valve current according to this control instruction to open the main valve core of the multi-way valve bank D to a preset opening degree, thereby controlling the actuator C to rise rapidly.

[0061] In one embodiment, the multi-way valve assembly 203 includes a multi-way valve bank. Determining the predicted required flow value of the multi-way valve assembly 203 according to the first control instruction includes: determining the working multi-way valve in the multi-way valve assembly 203 and the opening degree of the valve core of each working multi-way valve according to the first control instruction; determining the predicted required flow value of the multi-way valve assembly 203 according to the working multi-way valve and the opening degree of the valve core of each working multi-way valve. The controller 205 can determine the predicted required flow of each working multi-way valve according to the opening degree of the valve core of the working multi-way valve, and adjust the first current signal for the electro-hydraulic pump 201 according to the predicted required flow, so that the electro-hydraulic pump 201 outputs a first output flow corresponding to the predicted required flow. Among them, the first output flow output by the electro-hydraulic pump 201 can be greater than the preset value of the predicted required flow to avoid losses of hydraulic oil in the hydraulic control system, insufficient hydraulic oil pressure, and slow movement of the actuator.

[0062] In one embodiment, when the valve core of the load flow valve 202 moves, the oil inlet 202P of the load flow valve is communicated with the oil outlet 202T of the load flow valve. The hydraulic oil at the oil inlet 202P of the load flow valve flows into the hydraulic oil tank 204 through the oil outlet 202T of the load flow valve to limit the hydraulic oil pressure of the hydraulic control system and protect the hydraulic components of the hydraulic control system. The excess hydraulic oil flows out to the hydraulic oil tank 204 through the oil outlet 202T of the load flow valve, limiting the maximum hydraulic oil pressure of the hydraulic control system and preventing the hydraulic components of the hydraulic control system from being damaged due to excessive hydraulic oil pressure. After the valve core moves, the controller 205 will control the current of the electro-hydraulic pump 201 to reduce the output hydraulic oil flow of the electro-hydraulic pump 201.

[0063] In a specific embodiment, first, the controller 205 receives a first control instruction for the multi-way valve assembly 203 input by the user through the remote control device 206. The controller 205 determines the working multi-way valves in the multi-way valve assembly 203 and the spool opening of each working multi-way valve according to the first control instruction; determines the predicted required flow rate value of the multi-way valve assembly 203 according to the working multi-way valves and the spool opening of each working multi-way valve. The controller 205 outputs a first current signal to the electro-hydraulic proportional pump 201 according to the predicted required flow rate value to adjust the first output flow rate of the electro-hydraulic proportional pump 201. Subsequently, the controller 205 determines the working multi-way valves in the multi-way valve assembly 203 according to the first control instruction, and the working multi-way valves are one or more. The controller 205 obtains the maximum pressure difference setting value of the constant differential pressure reducing valve in the working multi-way valves. The controller 205 receives a second control instruction for the load flow valve 202 output by the user through the remote control device 206. The controller 205 determines a preset pressure according to the maximum pressure difference setting value and the second control instruction. Outputs a third current signal to the proportional solenoid of the load flow valve 202 according to the preset pressure, so that the starting pressure of the proportional solenoid is adjusted to the preset pressure. When the pressure difference is greater than the preset pressure, the spool of the load flow valve 202 moves. The controller 205 determines the moving distance of the spool of the load flow valve 202 through the displacement sensor. The controller 205 receives the spool displacement signal sent by the displacement sensor according to the moving distance. The controller 205 sends a second current signal to the electro-hydraulic proportional pump 201 according to the spool position carried in the spool displacement signal to adjust the second output flow rate of the electro-hydraulic proportional pump 201, so that the pressure difference is less than or equal to the preset pressure.

[0064] Through the above method, the controller 205 can determine that the output flow rate of the electro-hydraulic proportional pump 201 is greater than the required flow rate through the spool displacement signal of the load flow valve 202. The controller 205 can timely adjust the output flow rate of the electro-hydraulic proportional pump 201 to reduce energy waste. And the preset pressure of the proportional solenoid in the load flow valve 202 can be adjusted through the second control instruction input by the user, thereby avoiding the situation that the hydraulic oil pressure difference is insufficient and the actuator moves slowly under the condition of high hydraulic oil loss. Moreover, the method in the present application can greatly reduce energy loss compared with the fixed displacement pump and load sensing pump in the prior art, and can correct the output flow rate of the electro-hydraulic proportional pump compared with the electro-hydraulic proportional pump in the prior art. The technical solution of the present application adjusts the output flow rate of the electro-hydraulic proportional pump to reduce energy loss when there is excess flow in the hydraulic control system.

[0065] In one embodiment, an engineering vehicle is provided, including the above hydraulic control system.

[0066] Figure 1 It is a schematic flow chart of a control method for an electro-hydraulic proportional pump in an embodiment. It should be understood that although Figure 1The steps in the flowchart are shown in sequence according to the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figure 1 At least some of the steps in Figure 1 may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed alternately or in turn with at least some of the sub-steps or stages of other steps or other steps.

[0067] The hydraulic control system includes a controller 205 and a memory, and the controller 205 executes the functions stored in the memory to implement corresponding functions.

[0068] The controller 205 contains a kernel, and the kernel retrieves the corresponding program units from the memory. One or more kernels can be set, and the control method for the electro-hydraulic pump is realized by adjusting the kernel parameters.

[0069] The memory may include non-permanent memory in a computer-readable medium, in the form of random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash memory (flash RAM), and the memory includes at least one memory chip.

[0070] An embodiment of this application provides a storage medium, on which a program is stored, and when the program is executed by a processor, the above control method for the electro-hydraulic pump is implemented.

[0071] An embodiment of this application provides a controller 205, and a processor is used to run a program. When the program runs, the above control method for the electro-hydraulic pump is executed.

[0072] In one embodiment, a computer device is provided. The computer device can be a terminal, and its internal structure diagram can be as shown in Figure 4As shown. The computer device includes a processor A01, a network interface A02, a display screen A04, an input device A05, and a memory (not shown in the figure) connected via a system bus. Among them, the processor A01 of the computer device is used to provide computing and control capabilities. The memory of the computer device includes an internal memory A03 and a non-volatile storage medium A06. The non-volatile storage medium A06 stores an operating system B01 and a computer program B02. The internal memory A03 provides an environment for the operation of the operating system B01 and the computer program B02 in the non-volatile storage medium A06. The network interface A02 of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor A01, it realizes a control method for an electro-hydraulic proportional pump. The display screen A04 of the computer device can be a liquid crystal display screen or an electronic ink display screen. The input device A05 of the computer device can be a touch layer covering the display screen, or a button, a trackball, or a touchpad provided on the housing of the computer device, or an external keyboard, touchpad, or mouse, etc.

[0073] Those skilled in the art can understand that Figure 4 the structure shown in

[0074] merely represents a block diagram of some structures related to the solution of this application, and does not constitute a limitation on the computer device to which the solution of this application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0075] In one embodiment, after the spool of the load flow valve 202 is displaced, the displacement sensor of the load flow valve 202 can determine the displacement distance of the spool of the load flow valve 202 and send a displacement signal to the controller 205. The controller 205 can determine whether the spool of the load flow valve 202 has moved based on the displacement signal, and further determine whether the first output flow rate of the electro-hydraulic pump 201 needs to be adjusted.

[0076] In one embodiment, the control method further includes: determining the working multi-way valve in the multi-way valve assembly 203 according to the first control instruction, where the working multi-way valve is one or more; obtaining the maximum pressure difference setting value of the constant differential pressure reducing valve in the working multi-way valve; determining a preset pressure according to the maximum pressure difference setting value; and outputting a third current signal to the proportional solenoid of the load flow valve 202 according to the preset pressure, so that the starting pressure of the proportional solenoid is adjusted to the preset pressure.

[0077] In one embodiment, the control method further includes: determining the working multi-way valve in the multi-way valve assembly 203 according to the first control instruction, where the working multi-way valve is one or more; obtaining the maximum pressure difference setting value of the constant differential pressure reducing valve in the working multi-way valve; receiving a second control instruction for the load flow valve 202 output by the user through the remote control device 206; determining a preset pressure according to the maximum pressure difference setting value and the second control instruction; and outputting a third current signal to the proportional solenoid of the load flow valve 202 according to the preset pressure, so that the starting pressure of the proportional solenoid is adjusted to the preset pressure.

[0078] In one embodiment, receiving and outputting the first control instruction for the multi-way valve assembly 203 includes: receiving the first control instruction for the multi-way valve assembly 203 input by the user through the remote control device 206.

[0079] In one embodiment, determining the predicted demand flow rate value of the multi-way valve assembly 203 according to the first control instruction includes: determining the working multi-way valve in the multi-way valve assembly 203 and the spool opening of each working multi-way valve according to the first control instruction; and determining the predicted demand flow rate value of the multi-way valve assembly 203 according to the working multi-way valve and the spool opening of each working multi-way valve.

[0080] In one embodiment, when the spool of the load flow valve 202 moves, the load flow valve inlet 202P is communicated with the load flow valve outlet 202T, and the hydraulic oil at the load flow valve inlet 202P flows into the hydraulic oil tank 204 through the load flow valve outlet 202T to limit the hydraulic oil pressure of the hydraulic control system and protect the hydraulic components of the hydraulic control system.

[0081] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0082] The present application is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0083] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means that implement the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0084] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0085] In a typical configuration, a computing device includes one or more processors (CPUs), an input / output interface, a network interface, and a memory.

[0086] The memory may include non-permanent memory in the computer-readable medium, in the form of random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.

[0087] A computer-readable medium includes both permanent and non-permanent, removable and non-removable media and can implement information storage by any method or technology. The information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette tapes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer-readable medium does not include transitory computer-readable media such as modulated data signals and carrier waves.

[0088] It should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0089] The above are only embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A control method for an electro-proportional pump, characterized in that, Applied to a hydraulic control system, the hydraulic control system includes an electro-hydraulic proportional pump (201), a load flow valve (202), a multi-way valve assembly (203) and a hydraulic oil tank (204). The hydraulic oil tank (204) is connected to the electro-hydraulic proportional pump (201). The load flow valve includes a load flow valve inlet (202P), a load flow valve outlet (202T) and a load feedback oil port (202R). The electro-hydraulic proportional pump (201) is connected to the load flow valve inlet (202P) and the inlet of the multi-way valve assembly (203). The load feedback oil port (202R) is connected to the pressure feedback oil port (203R) of the multi-way valve assembly (203). The control method includes: Receiving and outputting a first control instruction for the multi-way valve assembly (203); Determining a predicted demand flow value of the multi-way valve assembly (203) according to the first control instruction; Outputting a first current signal to the electro-hydraulic proportional pump (201) according to the predicted demand flow value to adjust a first output flow of the electro-hydraulic proportional pump (201); Receiving a spool displacement signal of the load flow valve, where the spool displacement signal is sent when the spool of the load flow valve (202) is displaced when the pressure difference between the pressure at the load flow valve inlet (202P) and the pressure at the load feedback oil port (202R) is greater than a preset pressure; Sending a second current signal to the electro-hydraulic proportional pump (201) according to the spool position carried in the spool displacement signal to adjust a second output flow of the electro-hydraulic proportional pump (201) so that the pressure difference is less than or equal to the preset pressure.

2. The control method for an electro-proportional pump according to claim 1, wherein, The load flow valve (202) includes a displacement sensor. The receiving the spool displacement signal of the load flow valve (202) includes: When the pressure difference is greater than the preset pressure, the spool of the load flow valve (202) moves; Determining the moving distance of the spool of the load flow valve (202) through the displacement sensor; Receiving the spool displacement signal sent by the displacement sensor according to the moving distance.

3. The control method for an electro-proportional pump according to claim 1, wherein The load flow valve (202) includes a proportional electro-magnet. The multi-way valve assembly (203) includes multiple multi-way valves. Each multi-way valve includes at least one constant differential pressure reducing valve. The control method further includes: Determining the working multi-way valves in the multi-way valve assembly (203) according to the first control instruction. The working multi-way valves are one or more; Obtaining the maximum pressure difference setting value of the constant differential pressure reducing valve in the working multi-way valves; Determining the preset pressure according to the maximum pressure difference setting value; Outputting a third current signal to the proportional electro-magnet of the load flow valve (202) according to the preset pressure so that the starting pressure of the proportional electro-magnet is adjusted to the preset pressure.

4. The control method for an electro-proportional pump according to claim 1, wherein The hydraulic control system further includes a remote control device (206). The load flow valve (202) includes a proportional electro-magnet. The multi-way valve assembly (203) includes multiple multi-way valves. Each multi-way valve includes at least one constant differential pressure reducing valve. The control method further includes: Determine the working multi-way valve in the multi-way valve assembly (203) according to the first control instruction, where the working multi-way valve is one or more; Obtain the maximum differential pressure setting value of the differential pressure reducing valve in the working multi-way valve; Receive a second control instruction for the load flow valve (202) output by the user through the remote control device (206); Determine the preset pressure according to the maximum differential pressure setting value and the second control instruction; Output a third current signal to the proportional solenoid of the load flow valve (202) according to the preset pressure, so that the starting pressure of the proportional solenoid is adjusted to the preset pressure.

5. The control method for an electro-proportional pump according to claim 1, wherein The multi-way valve assembly (203) includes a multi-section multi-way valve, and determining the predicted demand flow value of the multi-way valve assembly (203) according to the first control instruction includes: Determine the working multi-way valve in the multi-way valve assembly (203) and the spool opening of each working multi-way valve according to the first control instruction; Determine the predicted demand flow value of the multi-way valve assembly (203) according to the working multi-way valve and the spool opening of each working multi-way valve.

6. The control method for an electro-proportional pump according to claim 1, wherein When the spool of the load flow valve (202) moves, the oil inlet (202P) of the load flow valve is communicated with the oil outlet (202T) of the load flow valve, and the hydraulic oil at the oil inlet (202P) of the load flow valve flows into the hydraulic oil tank (204) through the oil outlet (202T) of the load flow valve to limit the hydraulic oil pressure of the hydraulic control system and protect the hydraulic components of the hydraulic control system.

7. The control method for an electro-proportional pump according to claim 1, characterized in that, The hydraulic control system further includes a remote control device (206), and receiving and outputting the first control instruction for the multi-way valve assembly (203) includes: Receive and output the first control instruction for the multi-way valve assembly (203) input by the user through the remote control device (206).

8. A controller, characterized in that, Configured to execute the control method for the electro-hydraulic pump according to any one of claims 1 to 7.

9. A hydraulic control system, characterized in that, The system includes: A hydraulic oil tank (204); An electro-hydraulic pump (201), electrically connected to the controller (205), for outputting high-pressure hydraulic oil to the hydraulic control system; The multi-way valve assembly (203), connected to the load feedback oil port (202R) and the actuator of the load flow valve (202), for controlling the actuator to work and feedback the load pressure to the load feedback oil port (202R); The load flow valve (202), the load flow valve includes a load flow valve oil inlet (202P), a load flow valve oil outlet (202T) and the load feedback oil port (202R), the load flow valve oil inlet (202P) is connected to the electro-hydraulic pump (201), the load flow valve oil outlet (202T) is connected to the hydraulic oil tank (204), and the load flow valve (202) is electrically connected to the controller (205), and is used for sending the spool displacement signal of the load flow valve (202) to the controller (205) when the difference between the output pressure of the electro-hydraulic pump (201) and the load pressure is greater than the preset pressure; and The controller (205) according to claim 8.

10. The hydraulic control system according to claim 9, characterized in that, The load flow valve (202) further includes a displacement sensor for determining the spool displacement distance of the load flow valve (202) and sending the spool displacement signal to the controller (205).

11. The hydraulic control system according to claim 9, wherein The load flow valve further includes a proportional electromagnet for adjusting the starting pressure of the proportional electromagnet to a preset pressure according to a third current signal input by the controller (205).

12. The hydraulic control system according to claim 9, characterized in that, The hydraulic control system further includes: A remote control device (206), electrically connected to the controller (205), for triggering a first control instruction for the multi-way valve assembly (203) according to user operation and sending it to the controller (205).

13. The hydraulic control system according to claim 12, characterized in that, The remote control device (206) is further configured to trigger a second control instruction for the load flow valve (202) according to user operation and send it to the controller (205).

14. An engineering vehicle, characterized in that, Comprising the hydraulic control system according to any one of claims 9 to 13.

15. A machine-readable storage medium having instructions stored thereon, characterized in that, When executed by a processor, the instruction causes the processor to be configured to execute the control method for an electro-hydraulic pump according to any one of claims 1 to 7.

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