CN118242323A - Single-pump electrohydraulic control system, single-pump electrohydraulic control method and engineering machinery - Google Patents

Single-pump electrohydraulic control system, single-pump electrohydraulic control method and engineering machinery Download PDF

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Publication number
CN118242323A
CN118242323A CN202211657638.3A CN202211657638A CN118242323A CN 118242323 A CN118242323 A CN 118242323A CN 202211657638 A CN202211657638 A CN 202211657638A CN 118242323 A CN118242323 A CN 118242323A
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CN
China
Prior art keywords
controller
pump
main
actuators
electro
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CN202211657638.3A
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Chinese (zh)
Inventor
吕超
杜昂
肖飞
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Caterpillar SARL
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Caterpillar SARL
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Priority to CN202211657638.3A priority Critical patent/CN118242323A/en
Publication of CN118242323A publication Critical patent/CN118242323A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/16—Special measures for feedback, e.g. by a follow-up device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/08—Servomotor systems incorporating electrically operated control means
    • F15B21/087—Control strategy, e.g. with block diagram

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The present invention relates to a single pump electro-hydraulic control system for a construction machine, comprising an operation handle, a main pump, a main valve, an actuator, and a controller, wherein hydraulic fluid output by the main pump can be supplied to the actuator via the main valve, the controller is electrically connected with the operation handle, the main pump, and the main valve, respectively, the controller can receive electric signals from the operation handle, and can send electric signals to the main pump and the main valve so as to control the displacement of the main pump and the flow rate of the hydraulic fluid supplied to the actuator through the main valve, a pressure sensor for detecting a load pressure is provided on the actuator, the pressure sensor is electrically connected with the controller so as to feed back the detected load pressure signal to the controller, and the controller is configured to adjust the displacement of the main pump and the flow rate of the hydraulic fluid supplied to the actuator based on the electric signals from the operation handle and the received load pressure signal. The invention also relates to a single-pump electrohydraulic control method and engineering machinery.

Description

Single-pump electrohydraulic control system, single-pump electrohydraulic control method and engineering machinery
Technical Field
The invention relates to the technical field of hydraulic systems of engineering machinery, in particular to a single-pump electro-hydraulic control system and a single-pump electro-hydraulic control method for engineering machinery. The invention also relates to engineering machinery comprising the single-pump electrohydraulic control system.
Background
In a construction machine having a complex operation with a large load change, two or more actuators are often used for the work of the construction machine. To ensure coordination of the compound actions of the actuators, two or more circuits and flow control schemes are required, which requires a multiple pump control system including two or more pumps or a single pump load-sensitive system. In a multiple pump system, different actions are controlled by different pumps. In order to ensure coordination of the compound operation, a plurality of priority valves are additionally provided in the hydraulic system when the compound operation is performed. In a single pump load sensing system, feedback is provided to the hydraulic system by sensing load pressure, flow and power change signals, wherein a pressure compensating valve is necessary. Either way, in multi-pump systems and single pump load-sensitive systems, the complexity of the hydraulic system is increased.
The present invention is directed to solving at least one of the above-mentioned problems of the prior art, as well as other problems.
Disclosure of Invention
According to an aspect of the present invention, there is provided a single-pump electro-hydraulic control system for a construction machine, including an operation handle, a main pump, a main valve, an actuator, and a controller, wherein hydraulic fluid output by the main pump can be supplied to the actuator via the main valve, the controller is electrically connected to the operation handle, the main pump, and the main valve, respectively, the controller can receive an electric signal from the operation handle, and can send the electric signal to the main pump and the main valve, so as to control a displacement of the main pump and a flow rate of the hydraulic fluid supplied to the actuator through the main valve,
A pressure sensor for detecting the load pressure is arranged on the actuating mechanism, the pressure sensor is electrically connected with the controller so as to feed back the detected load pressure signal to the controller,
The controller is configured to adjust the displacement of the main pump and the flow of hydraulic fluid supplied to the actuator based on the electrical signal from the operating handle and the received load pressure signal.
The single-pump electrohydraulic control system does not use a pressure compensation module and does not need a complex multi-way valve compensation valve design, thereby reducing the number of system elements and the complexity of a hydraulic system and realizing the control and operation requirements of engineering machinery with minimum cost. Compared with hydraulic control, the electric signal control used by the invention has faster response speed, stronger anti-interference capability and higher system adjustment precision. In addition, the electronic control system ensures coordination of compound actions, and has simple structure and flexible control.
Advantageously, the single pump electro-hydraulic control system comprises a bypass valve arranged between the output of the main pump and the hydraulic tank of the work machine, the bypass valve being electrically connected to the controller, the controller being further configured to adjust the opening of the bypass valve based on the electrical signal from the operating handle and the received load pressure signal.
Advantageously, the main pump, the main valve and the bypass valve are each provided with an electro-proportional pressure reducing valve electrically connected to the controller for receiving the electrical signal sent by the controller and thereby regulating the displacement of the main pump and the opening of the main valve and the bypass valve.
Advantageously, the actuators are plural, and when the plural actuators perform a compound action, the controller is configured to receive a load pressure signal fed back by the pressure sensor of each of the plural actuators, and adjust the displacement of the main pump and the flow rate of the hydraulic fluid supplied to each of the plural actuators based on the electric signal from the operation handle of the plural actuators and the received load pressure signal.
Advantageously, the actuators are plural, and when the plural actuators perform a compound action, the controller is configured to receive a load pressure signal fed back by the pressure sensor of each of the plural actuators, and adjust the displacement of the main pump, the flow rate of the hydraulic fluid supplied to each of the plural actuators, and the opening degree of the bypass valve based on the electric signal from the operation handle of the plural actuators and the received load pressure signal.
According to another aspect of the present invention, there is provided a single-pump electro-hydraulic control method for a construction machine including an operation handle, a main pump, a main valve, an actuator, and a controller, wherein hydraulic fluid output by the main pump can be supplied to the actuator via the main valve, the controller is electrically connected to the operation handle, the main pump, and the main valve, respectively, the controller is capable of receiving electric signals from the operation handle, and is capable of transmitting the electric signals to the main pump and the main valve so as to control a displacement of the main pump and a flow rate of the hydraulic fluid supplied to the actuator through the main valve, wherein the single-pump electro-hydraulic control method includes:
Detecting load pressure by a pressure sensor arranged on the actuator and feeding back a detected load pressure signal to the controller;
By means of the controller, the displacement of the main pump and the flow of hydraulic fluid supplied to the actuator are regulated based on the electrical signal from the operating handle and the received load pressure signal.
Advantageously, the working machine further comprises a bypass valve arranged between the output port of the main pump and the hydraulic tank of the working machine, the bypass valve being electrically connected to the controller, the single-pump electro-hydraulic control method further comprising:
And adjusting, by the controller, an opening of the bypass valve based on the electrical signal from the operating handle and the received load pressure signal.
Advantageously, the main pump, the main valve and the bypass valve are each provided with an electro-proportional pressure reducing valve electrically connected to the controller for receiving the electrical signal sent by the controller and thereby regulating the displacement of the main pump and the opening of the main valve and the bypass valve.
Advantageously, the plurality of actuators are provided, and when the plurality of actuators perform a compound action, the single-pump electro-hydraulic control method includes:
And receiving, by the controller, a load pressure signal fed back by a pressure sensor of each of the plurality of actuators, and adjusting a displacement of the main pump and a flow rate of hydraulic fluid supplied to each of the plurality of actuators based on the received load pressure signal and an electrical signal from an operating handle of the plurality of actuators.
Advantageously, the plurality of actuators are provided, and when the plurality of actuators perform a compound action, the single-pump electro-hydraulic control method includes:
And receiving, by the controller, a load pressure signal fed back by a pressure sensor of each of the plurality of actuators, and adjusting a displacement of a main pump, a flow rate of hydraulic fluid supplied to each of the plurality of actuators, and an opening degree of the bypass valve based on the received load pressure signal and an electrical signal from an operation handle of the plurality of actuators.
According to another aspect of the invention, it relates to a construction machine comprising a single pump electro-hydraulic control system as described above.
Advantageously, the working machine is an excavator.
Drawings
Preferred embodiments of the present invention will be described in more detail below with reference to the accompanying schematic drawings. The drawings and corresponding embodiments are for illustration purposes only and are not intended to limit the present invention. In the drawings:
Figure 1 schematically shows a schematic diagram of a single-pump electro-hydraulic control system according to the invention in a single action,
Fig. 2 schematically shows a schematic diagram of a single pump electro-hydraulic control system according to the invention in a compound action.
List of reference numerals:
1. Operating handle 2 main pump
3. Actuator for main valve 4
5. Controller 6 hydraulic oil tank
7. Bypass valve 13 main valve
14. Control port of main valve core of actuating mechanism 31
32. Main valve core control port 33 Main valve core control port
34. Main valve core control port 100 single-pump electrohydraulic control system
Detailed Description
Embodiments of the present invention are described below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding and enabling description of the invention to one skilled in the art. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. Furthermore, it should be understood that the invention is not limited to specific described embodiments. Rather, any combination of the features and elements described below is contemplated to implement the invention, whether or not they relate to different embodiments. Thus, the aspects, features, embodiments and advantages described below are for illustrative purposes only and should not be construed as elements or limitations of the claims unless explicitly set forth in the claims.
Fig. 1 and 2 schematically illustrate a single pump electro-hydraulic control system 100 for a work machine, such as an excavating machine, but may be any other work machine or other type of machine having similar operating conditions requirements, in accordance with the present disclosure.
Fig. 1 schematically illustrates a schematic diagram of a single-pump electro-hydraulic control system 100 in a single motion, wherein only one actuator is shown. As shown in fig. 1, the single-pump electro-hydraulic control system 100 includes an operating handle 1, a main pump 2, a main valve 3, an actuator 4, and a controller 5. The actuator 4 is, for example, a boom, an arm, a bucket, a turning device, or the like. The hydraulic fluid (hydraulic oil) output by the main pump 2 can be supplied to the actuator 4 via the main valve 3, thereby causing the actuator 4 to perform a desired action. The controller 5 is electrically connected to the operation handle 1, the main pump 2, and the main valve 3, respectively, and the controller 5 is capable of receiving an electric signal from the operation handle 1 and transmitting an electric signal to the main pump 2 and the main valve 3 so as to control the displacement of the main pump 2 and the flow rate of the hydraulic fluid supplied to the actuator 4 through the main valve 3.
A bypass valve 7 is provided between an output port of the main pump 2 and the hydraulic tank 6 of the working machine, and the hydraulic fluid output from the main pump 2 can be returned to the hydraulic tank 6 via the bypass valve 7 as needed. The bypass valve 7 is electrically connected to the controller 5, and the controller 5 is capable of sending an electrical signal to the bypass valve 7 to control the opening of the bypass valve 7.
The main pump 2, the main valve 3 and the bypass valve 7 are each provided with an electric proportional pressure reducing valve electrically connected to the controller 5 for receiving an electric signal sent from the controller 5 and thereby adjusting the displacement of the main pump 2 and the opening degrees of the main valve 3 and the bypass valve 7. Specifically, the main spool control ports 31, 32 at both ends of the spool of the main valve 3 are respectively provided with an electric proportional pressure reducing valve capable of causing the spool to move when energized. By adjusting the stroke of the spool, the opening degree of the main valve 3 can be adjusted, thereby adjusting the flow rate of the hydraulic fluid supplied to the actuator 4 through the main valve 3. Similarly, the opening degree of the bypass valve 7 can be adjusted by an electric proportional pressure reducing valve of the bypass valve 7, thereby adjusting the flow rate of the hydraulic fluid returned to the hydraulic tank 6 through the bypass valve 7.
According to the invention, a pressure sensor (not shown) for detecting the load pressure is provided on the actuator 4, which pressure sensor is electrically connected to the controller 5 in order to feed back the detected load pressure signal to the controller 5. The controller 5 adjusts the displacement of the main pump 2, the flow rate of the hydraulic fluid supplied to the actuator 4 through the main valve 3, and the opening degree of the bypass valve 7 based on the electric signal from the operating handle 1 and the received load pressure signal. This is achieved by an internal logic judgment operation of the controller 5, for example, by a program stored in the controller 5, which calculates the displacement of the main pump 2, the stroke of the spool of the main valve 3, and the stroke of the spool of the bypass valve 7 using these parameters of the handle stroke and the load pressure.
Work conditions of a work machine often employ two or more actions, i.e., multiple actuators acting simultaneously. According to the present invention, when the plurality of actuators perform the compound action, the controller 5 receives the load pressure signal fed back by the pressure sensor of each of the plurality of actuators, and adjusts the displacement of the main pump 2, the flow rate of the hydraulic fluid supplied to each of the plurality of actuators, and the opening degree of the bypass valve 7 based on the electric signal from the operation handle of the plurality of actuators and the received load pressure signal.
Fig. 2 schematically shows a schematic diagram of a single-pump electrohydraulic control system 100 for a compound operation, wherein two actuators 4 and 14 are shown. For the sake of brevity, only the portions different from fig. 1 are described below. The hydraulic fluid output by the main pump 2 can be supplied to the actuator 4 via the main valve 3 and to the actuator 14 via the main valve 13. At the main spool control ports 33, 34 at both spool ends of the main valve 13, respectively, there are provided electric proportional pressure reducing valves electrically connected to the controller 5, which can cause the spool of the main valve 13 to move when energized. By adjusting the stroke of the spool, the opening degree of the main valve 13 can be adjusted, thereby adjusting the flow rate of the hydraulic fluid supplied to the actuator 14 through the main valve 13.
A pressure sensor (not shown) for detecting the load pressure is likewise provided on the actuator 14, which pressure sensor is electrically connected to the controller 5 in order to feed back a detected load pressure signal to the controller 5.
When the actuators 4 and 14 are simultaneously actuated, the controller 5 receives load pressure signals fed back from the pressure sensors of the actuators 4 and 14, and adjusts the displacement of the main pump 2, the flow rate of hydraulic fluid supplied to the actuators 4 and 14 through the main valves 3, 13, and the opening degree of the bypass valve 7 based on the electric signals from the operation handles of the actuators 4 and 14 and the received load pressure signals. The program in the controller 5 performs a complex logical judgment operation using the parameters of the operation handle stroke and the load pressures of the actuators 4 and 14, determines a logical relationship between the complex actions, and obtains the stroke of the main valve spool corresponding to each actuator, thereby adjusting the flow rates of the hydraulic fluid supplied to the actuators 4 and 14, respectively. Advantageously, the controller 5 adjusts the opening of the low load spool such that a flow rate matching the operating handle input ratio is achieved. The current signals of the electro proportional pressure reducing valves of the main valve 3 and the main valve 13 at this time are not dependent only on the operating handle, but the controller 5 is calculated based on the electric signal of the operating handle and the load feedback pressure of the actuator. If the total flow demand of the actuators 4 and 14 exceeds the maximum flow provided by the main pump 2 (flow saturation), the controller will adjust the stroke of each main valve spool accordingly so that the total actual flow equals the maximum flow provided by the main pump 2. The internal logic operations of the controller involved in the regulation process are not described in detail herein.
It will be appreciated that more than two actuators may be used in a work machine to perform a compound operation at the same time, where the single pump electro-hydraulic control system 100 operates in a similar control manner, but with increased complexity in software development and tuning involved in the calculations.
The single pump electro-hydraulic control system 100 of the present invention does not use a pressure compensation module and does not require a complex multi-way valve compensation valve design, thereby reducing the number of system components and complexity of the hydraulic system and achieving control and operational requirements of the engineering machinery at minimal cost. Compared with hydraulic control, the electric signal control used by the invention has faster response speed, stronger anti-interference capability and higher system adjustment precision. In addition, the electronic control system ensures coordination of compound actions, and has simple structure and flexible control.
Industrial applicability
The single pump electro-hydraulic control system according to the present invention is applicable to work machines such as excavators, loaders, and other types of machines having similar operating conditions requirements.
The operation of the single pump electro-hydraulic control system 100 in a single motion will be described below with boom lifting as an example (see fig. 1).
When the handle 1 is not operated at the beginning, the electromagnetic valve (electro proportional pressure reducing valve) of the main valve 3 has no input signal, the input signal current of the main pump 2 is small, the pump pressure is low, and the flow is small. The bypass valve 7 is in a throttle operation state, and the operating pressure of the main pump 2 is maintained at, for example, about 4 MPa.
When the boom is lifted by rapid pulling of the operation handle 1 in a very short time, an electro-proportional pressure reducing valve (hereinafter referred to as HE-side solenoid valve) of the main valve 3 corresponding to the head end of the boom cylinder is energized, the current increases, the flow rate to the actuator 4 (i.e., the boom) increases, and the bypass valve 7 tends to close. Then, the hydraulic fluid supplied to the cylinder overcomes the load, the cylinder starts to move, the current of the main pump 2 continues to increase, the current of the HE-side solenoid valve continues to rise, the bypass valve 7 closes, and all the flow output from the main pump 2 reaches the actuator 4 via the main valve 3.
When the actuator 4 reaches the end of stroke, flooding is started, the current of the main pump 2 is reduced (the flow rate is reduced, and the energy loss is reduced), the HE-side solenoid valve current is unchanged, and the bypass valve 7 is kept closed.
When the operating handle 1 is released, the current of the main pump 2 decreases, the flow rate decreases, the main valve 3 returns to its initial state, the main valve 3 returns to its neutral state (closed), the bypass valve 7 is rapidly opened to a fully opened state, and the hydraulic fluid is discharged back to the tank. After that, the bypass valve 7 is returned to its original state.
When the construction machine performs a composite action (taking a boom and an arm as an example), referring to fig. 2, the controller 5 determines a logical relationship between composite controls through a complex calculation based on an electric signal from the operation handle and a load pressure signal fed back by the pressure sensor. If the cylinder pressures of the boom and the arm are different at the time of the compound action, the controller 5 controls the main valve spool having a small pressure (load) to be turned down a little so as to establish the same or similar pressure therebetween. The current signals of the electro proportional pressure reducing valves of the main valve 3 and the main valve 13 at this time are not dependent only on the operating handle, but the controller 5 is calculated based on the electric signal of the operating handle and the load feedback pressure of the actuator.
During the compound action, the electric signal of the operating handle and the load pressure of each actuating mechanism participate in logic judgment and flow control.
The single pump electro-hydraulic control system and method of the present invention has been described above with the aid of specific embodiments. It will be apparent to those skilled in the art that various modifications and variations can be made to the above-disclosed embodiments without departing from the scope or spirit of the invention. For example, implementations of the invention may not include some of the specific features described, nor is the invention limited to the specific embodiments described, but any combination of the described features and elements is contemplated. Other embodiments will be apparent to those skilled in the art from consideration of the specification and practice of the disclosed single pump electro-hydraulic control system and method. It is intended that the specification and examples be considered as exemplary only, with a true scope being indicated by the following claims and their equivalents.

Claims (12)

1. A single-pump electro-hydraulic control system for a construction machine, comprising an operating handle, a main pump, a main valve, an actuator, and a controller, wherein hydraulic fluid output by the main pump can be supplied to the actuator via the main valve, the controller is electrically connected to the operating handle, the main pump, and the main valve, respectively, the controller is capable of receiving electrical signals from the operating handle, and is capable of sending electrical signals to the main pump and the main valve, so as to control the displacement of the main pump and the flow rate of hydraulic fluid supplied to the actuator through the main valve, characterized in that:
a pressure sensor for detecting the load pressure is arranged on the actuating mechanism, the pressure sensor is electrically connected with the controller so as to feed back the detected load pressure signal to the controller,
The controller is configured to adjust the displacement of the main pump and the flow of hydraulic fluid supplied to the actuator based on the electrical signal from the operating handle and the received load pressure signal.
2. The single pump electro-hydraulic control system of claim 1, wherein the single pump electro-hydraulic control system includes a bypass valve disposed between an output port of the main pump and a hydraulic tank of the work machine, the bypass valve being electrically connected to the controller, the controller further configured to adjust an opening of the bypass valve based on the electrical signal from the operating handle and the received load pressure signal.
3. The single pump electro-hydraulic control system of claim 2, wherein the main pump, main valve, and bypass valve are each provided with an electro-proportional pressure relief valve electrically connected to the controller for receiving an electrical signal sent by the controller and thereby regulating the displacement of the main pump and the opening of the main and bypass valves.
4. The single pump electro-hydraulic control system of claim 1, wherein the plurality of actuators is a plurality, wherein when the plurality of actuators are in compound action, the controller is configured to receive a load pressure signal fed back by the pressure sensor of each of the plurality of actuators, and to adjust the displacement of the main pump and the flow of hydraulic fluid supplied to each of the plurality of actuators based on the electrical signal from the operating handle of the plurality of actuators and the received load pressure signal.
5. The single pump electro-hydraulic control system of claim 2, wherein the plurality of actuators are configured such that when the plurality of actuators perform a compound action, the controller is configured to receive a load pressure signal fed back by the pressure sensor of each of the plurality of actuators, and to adjust the displacement of the main pump, the flow rate of hydraulic fluid supplied to each of the plurality of actuators, and the opening of the bypass valve based on the electrical signal from the operating handle of the plurality of actuators and the received load pressure signal.
6. A single-pump electro-hydraulic control method for a construction machine including an operation handle, a main pump, a main valve, an actuator, and a controller, wherein hydraulic fluid output by the main pump can be supplied to the actuator via the main valve, the controller is electrically connected to the operation handle, the main pump, and the main valve, respectively, the controller is capable of receiving electric signals from the operation handle, and is capable of transmitting electric signals to the main pump and the main valve so as to control a displacement of the main pump and a flow rate of the hydraulic fluid supplied to the actuator through the main valve, the single-pump electro-hydraulic control method comprising:
Detecting load pressure by a pressure sensor arranged on the actuator and feeding back a detected load pressure signal to the controller;
By means of the controller, the displacement of the main pump and the flow of hydraulic fluid supplied to the actuator are regulated based on the electrical signal from the operating handle and the received load pressure signal.
7. The single pump electro-hydraulic control method of claim 6, wherein the work machine further comprises a bypass valve disposed between an output port of the main pump and a hydraulic tank of the work machine, the bypass valve being electrically connected to the controller, the single pump electro-hydraulic control method further comprising:
And adjusting, by the controller, an opening of the bypass valve based on the electrical signal from the operating handle and the received load pressure signal.
8. The single pump electro-hydraulic control method of claim 7, wherein the main pump, main valve, and bypass valve are each provided with an electro-proportional pressure relief valve electrically connected to the controller for receiving an electrical signal sent by the controller and thereby adjusting the displacement of the main pump and the opening of the main valve and bypass valve.
9. The single pump electro-hydraulic control method of claim 6, wherein the plurality of actuators are provided, and wherein when the plurality of actuators perform a compound action, the single pump electro-hydraulic control method comprises:
And receiving, by the controller, a load pressure signal fed back by a pressure sensor of each of the plurality of actuators, and adjusting a displacement of the main pump and a flow rate of hydraulic fluid supplied to each of the plurality of actuators based on the received load pressure signal and an electrical signal from an operating handle of the plurality of actuators.
10. The single pump electro-hydraulic control method of claim 7, wherein the plurality of actuators are provided, and wherein when the plurality of actuators perform a compound action, the single pump electro-hydraulic control method comprises:
And receiving, by the controller, a load pressure signal fed back by a pressure sensor of each of the plurality of actuators, and adjusting a displacement of a main pump, a flow rate of hydraulic fluid supplied to each of the plurality of actuators, and an opening degree of the bypass valve based on the received load pressure signal and an electrical signal from an operation handle of the plurality of actuators.
11. A construction machine comprising a single pump electro-hydraulic control system according to any one of claims 1-5.
12. The work machine of claim 11, wherein the work machine is an excavator.
CN202211657638.3A 2022-12-22 2022-12-22 Single-pump electrohydraulic control system, single-pump electrohydraulic control method and engineering machinery Pending CN118242323A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211657638.3A CN118242323A (en) 2022-12-22 2022-12-22 Single-pump electrohydraulic control system, single-pump electrohydraulic control method and engineering machinery

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Application Number Priority Date Filing Date Title
CN202211657638.3A CN118242323A (en) 2022-12-22 2022-12-22 Single-pump electrohydraulic control system, single-pump electrohydraulic control method and engineering machinery

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CN118242323A true CN118242323A (en) 2024-06-25

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