CN109538456B - Electro-hydraulic proportional valve control pump adopting proportional valve and miniature high-speed digital valve for combined control and control method - Google Patents
Electro-hydraulic proportional valve control pump adopting proportional valve and miniature high-speed digital valve for combined control and control method Download PDFInfo
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- CN109538456B CN109538456B CN201811090434.XA CN201811090434A CN109538456B CN 109538456 B CN109538456 B CN 109538456B CN 201811090434 A CN201811090434 A CN 201811090434A CN 109538456 B CN109538456 B CN 109538456B
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- 239000003921 oil Substances 0.000 claims description 59
- 239000010720 hydraulic oil Substances 0.000 claims description 19
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
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- Fluid-Pressure Circuits (AREA)
- Servomotors (AREA)
Abstract
The invention discloses an electrohydraulic proportional valve control pump adopting combined control of a proportional valve and a miniature high-speed digital valve and a control method, wherein the electrohydraulic proportional valve control pump comprises a main pump, an oil tank, a proportional valve, four miniature high-speed digital valves, a variable piston and a displacement sensor; the electrohydraulic proportional valve control pump adopts the combination control of a large-flow proportional valve and a small-flow miniature high-speed digital valve, the response speed of a variable mechanism is improved by utilizing the large flow of the proportional valve in the variable process, and the precision of variable control is ensured by utilizing the small-flow resolution of the miniature high-speed digital valve at the tail end of the variable process; the invention adopts the combination control of the proportional valve and the miniature high-speed digital valve, avoids adopting a high-precision servo valve, and reduces the system cost; the miniature high-speed digital valve adopted by the invention has the advantages of simple structure, low failure rate, good adaptability to complex working conditions and improved reliability of the system, and can meet special working condition environments such as high temperature, high pressure and the like.
Description
Technical Field
The invention belongs to the field of variable pumps, and particularly relates to an electrohydraulic proportional valve control pump adopting a proportional valve and a miniature high-speed digital valve for combined control and a control method.
Background
The performance of a hydraulic pump as a power source of a hydraulic system directly affects the performance and efficiency of the hydraulic system. The hydraulic variable pump can adjust output characteristics such as constant current control, constant voltage control, constant power control and the like within a certain range according to working requirements under the action of the variable control device. The variable pump system has obvious energy-saving effect, and the new structure and control mode develop rapidly.
According to the different structures of the variable displacement mechanisms, the variable displacement pumps can be divided into variable displacement pumps based on mechanical-hydraulic variable mechanisms and variable displacement pumps based on mechanical-electric-hydraulic variable mechanisms. The variable pump adopting the mechanical-hydraulic variable mechanism integrates one or more control valves in the pump body according to the control mode of the variable pump, and the pump pumps hydraulic oil to push a variable piston to realize the variable of the pump after passing through the control valves. The variable pump adopting the electromechanical-electro-hydraulic variable mechanism usually adopts a proportional valve or a servo valve to control the variable mechanism, and has the advantages that the variable pump can realize random change of the pump displacement, but the variable pump adopting the proportional valve has the characteristics of dead zone, hysteresis, slow dynamic response, low precision and the like, so that the variable pump can only be used in a hydraulic system with lower performance requirements; the variable pump adopting the servo valve has the defects of high precision required during manufacturing, high requirement on oil in use, high use cost of the pump and limited use environment. Therefore, how to design a low-cost pump displacement control mode, so that the pump has the key problems of high control precision, good response characteristic and wide application range, which are needed to be considered.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the electrohydraulic proportional valve control pump adopting the joint control of the proportional valve and the miniature high-speed digital valve and the control method thereof.
The aim of the invention is realized by the following technical scheme: an electrohydraulic proportional valve controlled pump adopting the joint control of a proportional valve and a miniature high-speed digital valve comprises a main pump, an oil tank, a first miniature high-speed digital valve, a second miniature high-speed digital valve, a proportional valve, a third miniature high-speed digital valve, a fourth miniature high-speed digital valve, a variable piston and a displacement sensor; the oil suction port of the main pump is connected with the oil tank, and four branches are arranged behind the oil discharge port of the main pump and are respectively connected with an external load, an oil inlet of the proportional valve, an oil inlet of the third miniature high-speed digital valve and an oil inlet of the fourth miniature high-speed digital valve; the oil return port of the proportional valve, the oil outlet of the first miniature high-speed digital valve and the oil outlet of the second miniature high-speed digital valve are communicated with each other and are connected with the oil tank; the working oil port A of the proportional valve, the oil inlet of the first miniature high-speed digital valve and the oil outlet of the third miniature high-speed digital valve are communicated with each other and the left cavity of the variable piston; the working oil port B of the proportional valve, the oil inlet of the second miniature high-speed digital valve and the oil outlet of the fourth miniature high-speed digital valve are communicated with each other and the right cavity of the variable piston; the variable piston is connected with a variable mechanism of the main pump and pushes the variable mechanism to finish variable; the displacement sensor is connected with a piston rod of the variable piston and measures the displacement of the piston rod of the variable piston.
Further, the opening and closing and the adjustment of the proportional valve, the first miniature high-speed digital valve, the second miniature high-speed digital valve, the third miniature high-speed digital valve and the fourth miniature high-speed digital valve are controlled by adopting an electric control system.
Further, the flow rate of the proportional valve is larger than that of the first miniature high-speed digital valve, the second miniature high-speed digital valve, the third miniature high-speed digital valve and the fourth miniature high-speed digital valve; when the variable piston runs at high speed, the proportional valve is adopted for control, and when the variable piston is positioned accurately, the micro-flow adjustment is carried out by adopting the first micro high-speed digital valve, the second micro high-speed digital valve, the third micro high-speed digital valve and the fourth micro high-speed digital valve.
Further, the proportional valve is controlled by adopting a continuous signal, and the first miniature high-speed digital valve, the second miniature high-speed digital valve, the third miniature high-speed digital valve and the fourth miniature high-speed digital valve are controlled by adopting a pulse signal.
Further, the pulse flow of the first micro high-speed digital valve, the second micro high-speed digital valve, the third micro high-speed digital valve and the fourth micro high-speed digital valve is determined by the frequency and the duty ratio of the PWM signal.
A control method of an electrohydraulic proportional valve controlled pump adopting a proportional valve and a miniature high-speed digital valve for combined control comprises the following steps:
when the displacement of the electro-hydraulic proportional valve control pump needs to be increased, the proportional valve works at the left position, hydraulic oil at the outlet of the main pump enters the left cavity of the variable piston through the proportional valve, the piston rod of the variable piston is pushed to move right rapidly, the displacement of the electro-hydraulic proportional valve control pump is increased, meanwhile, the displacement sensor detects the actual position of the piston rod of the variable piston, the distance between the target position of the piston rod and the actual position of the piston rod is calculated, and the distance is compared with a preset working state switching set value of the proportional valve; if the working state switching set value of the proportional valve is not reached, maintaining the proportional valve to work at the left position, and closing the first miniature high-speed digital valve, the second miniature high-speed digital valve, the third miniature high-speed digital valve and the fourth miniature high-speed digital valve; if the working state switching set value of the proportional valve is reached, the proportional valve works in the middle position, a corresponding number of pulse signals are sent out according to the working state switching set value and the pulse flow, the third micro high-speed digital valve and the second micro high-speed digital valve are controlled to be switched on and off at high speed, hydraulic oil at the outlet of the main pump enters the left cavity of the variable piston through the third micro high-speed digital valve, the piston rod of the variable piston is pushed to move right and slow to reach a target position, and hydraulic oil at the right cavity of the variable piston flows back to the oil tank through the second micro high-speed digital valve;
when the displacement of the electro-hydraulic proportional valve control pump needs to be reduced, the proportional valve works at the right position, hydraulic oil at the outlet of the main pump enters the right cavity of the variable piston through the proportional valve to push the piston rod of the variable piston to rapidly move left and reduce the displacement of the electro-hydraulic proportional valve control pump, meanwhile, the displacement sensor detects the actual position of the piston rod of the variable piston, calculates the distance between the target position of the piston rod and the actual position of the piston rod, and compares the distance with a preset working state switching set value of the proportional valve; if the working state switching set value of the proportional valve is not reached, maintaining the proportional valve to work at the right position, and closing the first miniature high-speed digital valve, the second miniature high-speed digital valve, the third miniature high-speed digital valve and the fourth miniature high-speed digital valve; if the working state switching set value of the proportional valve is reached, the proportional valve works in the middle position, a corresponding number of pulse signals are sent out according to the working state switching set value and the pulse flow, the fourth micro high-speed digital valve and the first micro high-speed digital valve are controlled to be switched on and off at high speed, hydraulic oil at the outlet of the main pump enters the right cavity of the variable piston through the fourth micro high-speed digital valve, the piston rod of the variable piston is pushed to move left slowly to reach the instruction position, and hydraulic oil at the left cavity of the variable piston flows back to the oil tank through the first micro high-speed digital valve.
The beneficial results of the invention are:
(1) The electro-hydraulic proportional valve control pump has high control precision and high response speed: the electrohydraulic proportional valve-controlled pump is controlled by adopting a large-flow proportional valve and a small-flow miniature high-speed digital valve in a combined way, the response speed of a variable mechanism is improved by utilizing the large flow of the proportional valve in the variable process, and the precision of variable control is ensured by utilizing the small-flow resolution of the miniature high-speed digital valve at the tail end of the variable process.
(2) The cost of the electro-hydraulic proportional valve control pump is reduced: the electro-hydraulic proportional valve-controlled pump is controlled by adopting a proportional valve and a miniature high-speed digital valve in a combined way, so that a high-precision servo valve is avoided, and the system cost is reduced.
(3) The electrohydraulic proportional valve control pump has high reliability: the miniature high-speed digital valve adopted by the electro-hydraulic proportional valve control pump has simple structure, low failure rate and good adaptability to complex working conditions, meets special working condition environments such as high temperature, high pressure and the like, and improves the reliability of the system.
Drawings
FIG. 1 is a schematic diagram of an electrohydraulic proportional valve controlled pump employing a proportional valve and a miniature high-speed digital valve in combination control;
in the figure: the hydraulic system comprises a 1-main pump, a 2-oil tank, a 3-first miniature high-speed digital valve, a 4-second miniature high-speed digital valve, a 5-proportional valve, a 6-third miniature high-speed digital valve, a 7-fourth miniature high-speed digital valve, an 8-variable piston and a 9-displacement sensor.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present invention.
As shown in fig. 1, the electro-hydraulic proportional valve controlled pump adopting the joint control of the proportional valve and the miniature high-speed digital valve provided by the embodiment comprises a main pump 1, an oil tank 2, a first miniature high-speed digital valve 3, a second miniature high-speed digital valve 4, a proportional valve 5, a third miniature high-speed digital valve 6, a fourth miniature high-speed digital valve 7, a variable piston 8 and a displacement sensor 9; the oil suction port of the main pump 1 is connected with the oil tank 2, and four branches are arranged behind the oil discharge port of the main pump 3 and are respectively connected with an external load, an oil inlet of the proportional valve 5, an oil inlet of the third miniature high-speed digital valve 6 and an oil inlet of the fourth miniature high-speed digital valve 7; the oil return port of the proportional valve 5, the oil outlet of the first miniature high-speed digital valve 3 and the oil outlet of the second miniature high-speed digital valve 4 are communicated with each other and are connected with the oil tank 2; the working oil port A of the proportional valve 5, the oil inlet of the first miniature high-speed digital valve 3 and the oil outlet of the third miniature high-speed digital valve 6 are communicated with each other and the left cavity of the variable piston 8; the working oil port B of the proportional valve 5, the oil inlet of the second miniature high-speed digital valve 4 and the oil outlet of the fourth miniature high-speed digital valve 7 are communicated with each other and the right cavity of the variable piston 8; the variable piston 8 is connected with a variable mechanism of the main pump 1 and pushes the variable mechanism to finish variable; the displacement sensor 9 is connected with a piston rod of the variable piston 8, and measures the displacement of the piston rod of the variable piston 8.
Further, the opening and closing and the adjustment of the proportional valve 5, the first miniature high-speed digital valve 3, the second miniature high-speed digital valve 4, the third miniature high-speed digital valve 6 and the fourth miniature high-speed digital valve 7 are controlled by adopting an electric control system.
Further, the proportional valve 5 is a large-flow proportional valve, the flow can be selected to be 100L/min, and continuous signal control is adopted.
Further, the first micro high-speed digital valve 3, the second micro high-speed digital valve 4, the third micro high-speed digital valve 6 and the fourth micro high-speed digital valve 7 are small-flow micro high-speed digital valves, the flow can be 1L/min, and pulse signals are adopted for control.
Further, the pulse flow rates of the first micro high-speed digital valve 3, the second micro high-speed digital valve 4, the third micro high-speed digital valve 6 and the fourth micro high-speed digital valve 7 are determined by the frequency and the duty ratio of the PWM signal.
Further, when the variable piston 8 runs at high speed, the variable piston is controlled by the proportional valve 5, and when the variable piston is positioned accurately, the micro-flow adjustment is performed by the first micro high-speed digital valve 3, the second micro high-speed digital valve 4, the third micro high-speed digital valve 6 and the fourth micro high-speed digital valve 7.
The working process of the electrohydraulic proportional valve control pump is as follows:
when the displacement of the electro-hydraulic proportional valve control pump needs to be increased, the proportional valve 5 works at the left position, hydraulic oil at the outlet of the main pump 1 enters the left cavity of the variable piston 8 through the proportional valve 5, the piston rod of the variable piston 8 is pushed to move right rapidly, the displacement of the electro-hydraulic proportional valve control pump is increased, meanwhile, the displacement sensor 9 detects the actual position of the piston rod of the variable piston 8, the distance between the target position of the piston rod and the actual position of the piston rod is calculated, and the distance is compared with a preset working state switching set value of the proportional valve 5; one specific example of selection of the operation state switching setting value of the proportional valve 5 is as follows, but is not limited thereto: taking the cylinder diameter of the variable piston 8 as 100mm, the piston rod diameter of the variable piston 8 as 45mm, when the proportional valve 5 independently controls the variable piston 8, the moving speed of the variable piston 8 as 266.1mm/s, and when the second miniature high-speed digital valve 4 and the third miniature high-speed digital valve 6 independently control the variable piston 8, the moving speed of the variable piston 8 as 2.66mm/s, and at the moment, the working state switching set value of the proportional valve 5 is 10mm; if the working state switching set value of the proportional valve 5 is not reached, the proportional valve 5 is maintained to work at the left position, and the first miniature high-speed digital valve 3, the second miniature high-speed digital valve 4, the third miniature high-speed digital valve 6 and the fourth miniature high-speed digital valve 7 are closed; if the working state switching set value of the proportional valve 5 is reached, the proportional valve 5 works in the middle position, a corresponding number of pulse signals are sent out according to the working state switching set value and the pulse flow, the third micro high-speed digital valve 6 and the second micro high-speed digital valve 4 are controlled to be opened and closed at a high speed, hydraulic oil at the outlet of the main pump 1 enters the left cavity of the variable piston 8 through the third micro high-speed digital valve 6, the piston rod of the variable piston 8 is pushed to move right and slow to reach a target position, and hydraulic oil at the right cavity of the variable piston 8 flows back to the oil tank 2 through the second micro high-speed digital valve 4.
When the displacement of the electro-hydraulic proportional valve control pump needs to be reduced, the proportional valve 5 works at the right position, hydraulic oil at the outlet of the main pump 1 enters the right cavity of the variable piston 8 through the proportional valve 5, the piston rod of the variable piston 8 is pushed to rapidly move left, the displacement of the electro-hydraulic proportional valve control pump is reduced, meanwhile, the displacement sensor 9 detects the actual position of the piston rod of the variable piston 8, the distance between the target position of the piston rod and the actual position of the piston rod is calculated, and the distance is compared with a preset working state switching set value of the proportional valve 5; if the working state switching set value of the proportional valve 5 is not reached, the proportional valve 5 is maintained to work at the right position, and the first miniature high-speed digital valve 3, the second miniature high-speed digital valve 4, the third miniature high-speed digital valve 6 and the fourth miniature high-speed digital valve 7 are closed; if the working state switching set value of the proportional valve 5 is reached, the proportional valve 5 works in the middle position, a corresponding number of pulse signals are sent out according to the working state switching set value and the pulse flow, the fourth micro high-speed digital valve 7 and the first micro high-speed digital valve 3 are controlled to be opened and closed at a high speed, hydraulic oil at the outlet of the main pump 1 enters the right cavity of the variable piston 8 through the fourth micro high-speed digital valve 7, the piston rod of the variable piston 8 is pushed to move left at a low speed to reach an instruction position, and hydraulic oil at the left cavity of the variable piston 8 flows back to the oil tank 2 through the first micro high-speed digital valve 3.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.
Claims (6)
1. The electro-hydraulic proportional valve control pump adopting the combined control of the proportional valve and the miniature high-speed digital valve is characterized by comprising a main pump (1), an oil tank (2), a first miniature high-speed digital valve (3), a second miniature high-speed digital valve (4), a proportional valve (5), a third miniature high-speed digital valve (6), a fourth miniature high-speed digital valve (7), a variable piston (8) and a displacement sensor (9); an oil suction port of the main pump (1) is connected with the oil tank (2), and four branches are arranged behind the oil discharge port of the main pump (3) and are respectively connected with an external load, an oil inlet of the proportional valve (5), an oil inlet of the third miniature high-speed digital valve (6) and an oil inlet of the fourth miniature high-speed digital valve (7); the oil return port of the proportional valve (5), the oil outlet of the first miniature high-speed digital valve (3) and the oil outlet of the second miniature high-speed digital valve (4) are communicated with each other and are connected with the oil tank (2); the working oil port A of the proportional valve (5), the oil inlet of the first miniature high-speed digital valve (3) and the oil outlet of the third miniature high-speed digital valve (6) are communicated with each other and the left cavity of the variable piston (8); the working oil port B of the proportional valve (5), the oil inlet of the second miniature high-speed digital valve (4) and the oil outlet of the fourth miniature high-speed digital valve (7) are communicated with each other and the right cavity of the variable piston (8); the variable piston (8) is connected with a variable mechanism of the main pump (1) and pushes the variable mechanism to finish variable; the displacement sensor (9) is connected with a piston rod of the variable piston (8) and measures the displacement of the piston rod of the variable piston (8).
2. The electro-hydraulic proportional valve control pump adopting the combined control of the proportional valve and the miniature high-speed digital valve according to claim 1 is characterized in that the opening and the closing of the proportional valve (5), the first miniature high-speed digital valve (3), the second miniature high-speed digital valve (4), the third miniature high-speed digital valve (6) and the fourth miniature high-speed digital valve (7) are controlled by adopting an electric control system.
3. The electro-hydraulic proportional valve control pump adopting the combined control of the proportional valve and the miniature high-speed digital valve according to claim 1, wherein the flow rate of the proportional valve (5) is larger than that of the first miniature high-speed digital valve (3), the second miniature high-speed digital valve (4), the third miniature high-speed digital valve (6) and the fourth miniature high-speed digital valve (7); when the variable piston (8) runs at high speed, the variable piston is controlled by the proportional valve (5), and when the variable piston is positioned accurately, the micro-flow adjustment is performed by the first micro high-speed digital valve (3), the second micro high-speed digital valve (4), the third micro high-speed digital valve (6) and the fourth micro high-speed digital valve (7).
4. The electro-hydraulic proportional valve control pump adopting the combined control of the proportional valve and the miniature high-speed digital valve according to claim 1 is characterized in that the proportional valve (5) is controlled by adopting a continuous signal, and the first miniature high-speed digital valve (3), the second miniature high-speed digital valve (4), the third miniature high-speed digital valve (6) and the fourth miniature high-speed digital valve (7) are controlled by adopting pulse signals.
5. The electro-hydraulic proportional valve control pump adopting the combined control of the proportional valve and the miniature high-speed digital valve according to claim 4 is characterized in that the pulse flow rate of the first miniature high-speed digital valve (3), the second miniature high-speed digital valve (4), the third miniature high-speed digital valve (6) and the fourth miniature high-speed digital valve (7) is determined by the frequency and the duty ratio of PWM signals.
6. A method of controlling an electro-hydraulic proportional valve pump as claimed in any one of claims 1 to 5, comprising the steps of:
when the displacement of the electro-hydraulic proportional valve control pump needs to be increased, the proportional valve (5) works at the left position, hydraulic oil at the outlet of the main pump (1) enters the left cavity of the variable piston (8) through the proportional valve (5), the piston rod of the variable piston (8) is pushed to move right rapidly, the displacement of the electro-hydraulic proportional valve control pump is increased, meanwhile, the displacement sensor (9) detects the actual position of the piston rod of the variable piston (8), the distance between the target position of the piston rod and the actual position of the piston rod is calculated, and the distance is compared with a preset working state switching set value of the proportional valve (5); if the working state switching set value of the proportional valve (5) is not reached, the proportional valve (5) is maintained to work at the left position, and the first miniature high-speed digital valve (3), the second miniature high-speed digital valve (4), the third miniature high-speed digital valve (6) and the fourth miniature high-speed digital valve (7) are closed; if the working state switching set value of the proportional valve (5) is reached, the proportional valve (5) works in the middle position, a corresponding number of pulse signals are sent out according to the working state switching set value and the pulse flow, the third micro high-speed digital valve (6) and the second micro high-speed digital valve (4) are controlled to be opened and closed at a high speed, hydraulic oil at the outlet of the main pump (1) enters the left cavity of the variable piston (8) through the third micro high-speed digital valve (6), the piston rod of the variable piston (8) is pushed to move to the target position in a slow speed and right mode, and hydraulic oil at the right cavity of the variable piston (8) flows back to the oil tank (2) through the second micro high-speed digital valve (4);
when the displacement of the electro-hydraulic proportional valve control pump needs to be reduced, the proportional valve (5) works at the right position, hydraulic oil at the outlet of the main pump (1) enters the right cavity of the variable piston (8) through the proportional valve (5), the piston rod of the variable piston (8) is pushed to rapidly move left, the displacement of the electro-hydraulic proportional valve control pump is reduced, meanwhile, the displacement sensor (9) detects the actual position of the piston rod of the variable piston (8), the distance between the target position of the piston rod and the actual position of the piston rod is calculated, and the distance is compared with a preset working state switching set value of the proportional valve (5); if the working state switching set value of the proportional valve (5) is not reached, the proportional valve (5) is maintained to work at the right position, and the first miniature high-speed digital valve (3), the second miniature high-speed digital valve (4), the third miniature high-speed digital valve (6) and the fourth miniature high-speed digital valve (7) are closed; if the working state switching set value of the proportional valve (5) is reached, the proportional valve (5) works in the middle position, a corresponding number of pulse signals are sent out according to the working state switching set value and the pulse flow, the fourth micro high-speed digital valve (7) and the first micro high-speed digital valve (3) are controlled to be opened and closed at a high speed, hydraulic oil at the outlet of the main pump (1) enters the right cavity of the variable piston (8) through the fourth micro high-speed digital valve (7), the piston rod of the variable piston (8) is pushed to move left at a low speed to reach a command position, and hydraulic oil at the left cavity of the variable piston (8) flows back to the oil tank (2) through the first micro high-speed digital valve (3).
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| CN201811090434.XA CN109538456B (en) | 2018-09-18 | 2018-09-18 | Electro-hydraulic proportional valve control pump adopting proportional valve and miniature high-speed digital valve for combined control and control method |
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| CN201811090434.XA CN109538456B (en) | 2018-09-18 | 2018-09-18 | Electro-hydraulic proportional valve control pump adopting proportional valve and miniature high-speed digital valve for combined control and control method |
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