CN112594240B - Hydraulic system of working device, control method and electric loader - Google Patents
Hydraulic system of working device, control method and electric loader Download PDFInfo
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- CN112594240B CN112594240B CN202011551358.5A CN202011551358A CN112594240B CN 112594240 B CN112594240 B CN 112594240B CN 202011551358 A CN202011551358 A CN 202011551358A CN 112594240 B CN112594240 B CN 112594240B
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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
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
- F15B11/166—Controlling a pilot pressure in response to the load, i.e. supply to at least one user is regulated by adjusting either the system pilot pressure or one or more of the individual pilot command pressures
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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
- 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
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
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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
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
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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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
Abstract
The invention relates to the technical field of electric loaders, in particular to a hydraulic system of a working device, a control method and an electric loader. The controller can simultaneously control the rotating speed of the motor and the action of the multi-way valve according to the signal of the electric control handle, the rotating speed of the motor is automatically adjusted along with the swing angle of the electric control handle, the rotating speed of the motor of the working pump does not need to be independently controlled, and the rotating speed of the motor is continuously adjusted according to the requirement.
Description
Technical Field
The invention relates to the technical field of electric loaders, in particular to a hydraulic system of a working device, a control method and an electric loader.
Background
A loader is a very popular engineering machine, and a conventional fuel loader uses an engine as a power source, and each hydraulic pump is mounted on a gearbox to provide a pressure oil source for a working device, steering and the like. The engine consumes a large amount of fuel in the working process of the conventional fuel loader, and the exhaust gas discharged by the engine can pollute the environment. The electric loader uses the battery as the energy, and the motor is as power component, and in the use, the electric loader does not have the emission of waste gas, and is more environmental protection, so the electric loader is the trend of future development.
The number of the motors in the electric loader can be one or more, if one motor is used, the motor drives the gearbox, and the plurality of hydraulic pumps are arranged on the gearbox, so that the rotating speed of the motor influences the traveling system and the working system and cannot be separately controlled, and the rotating speed of the motor can only be controlled according to the high requirement; if a plurality of motors are used, one motor drives the traveling system, one or more motors drive the working pump, the steering pump and the like, so that the traveling system and the working system are more flexibly controlled, the rotating speed of the motor can be independently adjusted as required, and the rotating speed of the motor can be reduced or even stopped when the motor is not required to provide power.
Due to the current limitations of battery technology, the working time of the electric engineering machine is limited, so that the energy saving of the system is very important for the electric loader. The rotating speed of the motor of the current working pump is controlled by using a button on a handle, generally divided into low, medium and high grades, so that the manual control is very troublesome, and real-time and continuous adjustment can not be carried out according to actual requirements.
In addition, the working hydraulic system of the conventional electric transfer loader is similar to that of the conventional fuel loader, most of the working hydraulic systems adopting throttling control have throttling loss when a hydraulic control multi-way valve is not completely opened and does not act at full speed, and the loader often performs micro-action when loading cargoes, so that the throttling loss is more, and certain electric energy is lost for the electric loader which is very important in energy conservation.
Disclosure of Invention
The invention aims to provide a hydraulic system of a working device, which aims to solve the technical problems that the rotating speed of a working pump motor needs to be controlled manually and cannot be adjusted continuously in real time according to actual needs in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a working device hydraulic system, includes oil tank, working pump, multiple unit valve, electromagnetism valves, motor, automatically controlled handle and controller, the motor with the working pump drive is connected, the oil inlet of working pump with the oil tank intercommunication, the oil-out of working pump with the oil inlet intercommunication of multiple unit valve, the oil-out of multiple unit valve links to each other with lift cylinder and tipping bucket hydro-cylinder, the control end of multiple unit valve with electromagnetism valves intercommunication, electromagnetism valves the motor and automatically controlled handle all with the controller electricity is connected.
As the optimal technical scheme of the hydraulic system of the working device, the hydraulic system further comprises a pressure sensor, and the pressure sensor is arranged on a pipeline for communicating an oil outlet of the working pump with an oil inlet of the multi-way valve.
As the optimal technical scheme of the hydraulic system of the working device, the hydraulic system further comprises an oil return filter, and the oil return filter is arranged on a pipeline communicated with the oil tank and an oil return port of the multi-way valve.
As the preferable technical scheme of the hydraulic system of the working device, the controller is a vehicle control unit.
The invention aims to provide a control method of a hydraulic system of a working device, which aims to solve the technical problem of large throttling loss of the hydraulic system in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a control method applied to a hydraulic system of a working device according to any one of the above claims, characterized by comprising the steps of:
s10, starting a loader;
s20, the rotating speed of the motor is zero;
s30, judging whether an operation signal of the electric control handle is received, and if so, executing a next step S40; if not, returning to the previous step S20;
s40, judging a specific control instruction of the electric control handle, and if the control instruction is to lift or skip the bucket, entering a step S511; if the manipulation command is to lower the bucket, step S521 is executed;
s511, gradually increasing the output pressure of the control electromagnetic valve group to a value corresponding to the swing angle of the electric control handle, and then executing the step S512;
s512, controlling the rotation speed of the motor to gradually increase to a size corresponding to the swing angle of the electric control handle, and then executing the step S60;
s521, controlling the output pressure of the electromagnetic valve group and the rotating speed of the motor to be increased to the size corresponding to the swing signal of the electric control handle, and then executing the step S60;
s60, after receiving a signal that the current of the electric control handle is reduced to zero, judging whether the electric control handle is not operated for a long time, if so, returning to the step S20; if not, the process returns to the step S40.
As a preferred technical solution of the control method of the hydraulic system of the working device, in step S40, before the specific operation command of the electric control handle is judged, the motor is controlled to enter the standby rotation speed.
As a preferred technical solution of the control method for the hydraulic system of the working device, in the process of executing steps S10 to S60, the controller detects the output power of the motor in real time, and if it is detected that the output power exceeds the rated output power of the motor, the controller controls the rotation speed of the motor to be reduced to a preset range value.
As a preferred technical solution of the control method of the hydraulic system of the working device, in the process of executing steps S10 to S60, the controller detects the temperature of the motor in real time, and if the detected temperature exceeds the limit temperature of the motor, the rotation speed of the motor is controlled to be reduced to a preset range value.
As a preferred technical solution of the control method of the hydraulic system of the working device, in the process of executing steps S10 to S60, the controller detects the position of the bucket in real time, and if it is detected that the bucket reaches the limit position, the rotation speed of the motor is controlled to be reduced to the standby rotation speed, and the current of the solenoid valve set is controlled to be reduced to zero.
The invention aims to provide an electric loader, which aims to solve the technical problem that the throttling loss of a hydraulic system is large in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
an electric loader, which adopts the control method of the hydraulic system of the working device.
The invention has the beneficial effects that:
according to the hydraulic system of the working device, the controller can simultaneously control the rotating speed of the motor and the action of the multi-way valve according to the signal of the electric control handle, so that the rotating speed of the motor is automatically adjusted along with the swing angle of the electric control handle, the rotating speed of the motor of the working pump does not need to be independently controlled, and the rotating speed of the motor is continuously adjusted according to needs. On the basis of the hydraulic system of the existing working device, the hydraulic control handle is changed into the electric control handle, the electromagnetic valve group is added, the existing hydraulic control operation is changed into the electric control operation, the universality of the existing working pump and the existing hydraulic control multi-way valve is kept, and the cost is lower.
According to the control method of the hydraulic system of the working device, in the control strategy of lifting and tipping bucket of the bucket, the multi-way valve is fully opened, and then the rotating speed of the motor is increased, so that when the bucket does not act at full speed, only throttling loss exists in the opening process of the multi-way valve, but because the rotating speed of the motor is small, the flow of the working pump is small, the throttling loss is small, and after the multi-way valve is fully opened, and the rotating speed of the motor is increased to improve the acting speed of the bucket, no throttling loss exists, and more energy is saved. Furthermore, the power of the working pump motor is calculated in real time and the temperature is monitored in real time in the working process, so that the working pump motor can be protected. In addition, when the bucket reaches the limit position, the rotating speed of the motor is controlled to be reduced to the standby rotating speed, and meanwhile, the current of the electromagnetic valve bank is controlled to be reduced to zero, so that the energy is saved.
Drawings
FIG. 1 is a schematic diagram of a hydraulic system of a work implement according to one embodiment of the present invention;
fig. 2 is a flowchart illustrating a method for controlling a hydraulic system of a work implement according to a second embodiment of the present invention.
In the figure:
01. lifting the oil cylinder; 02. a tipping oil cylinder;
1. an oil tank; 2. a working pump; 3. a multi-way valve; 4. an oil return filter; 5. a motor; 6. an electromagnetic valve group; 7. an electric control handle; 8. a controller; 9. a pressure sensor.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings and the embodiment. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
Example one
As shown in fig. 1, the present embodiment provides a working device hydraulic system, which is suitable for a multi-motor electric loader, that is, a motor drives a traveling system, one motor drives a steering pump and a working pump 2 at the same time or two motors drive the steering pump and the working pump 2 respectively. The hydraulic system of the working device comprises an oil tank 1, a working pump 2, a multi-way valve 3, an electromagnetic valve group 6, a motor 5, an electric control handle 7 and a controller 8, the motor 5 is in drive connection with the working pump 2, an oil inlet of the working pump 2 is communicated with the oil tank 1, an oil outlet of the working pump 2 is communicated with an oil inlet of the multi-way valve 3, an oil outlet of the multi-way valve 3 is connected with a lifting oil cylinder 01 and a tipping bucket oil cylinder 02, a control end of the multi-way valve 3 is communicated with the electromagnetic valve group 6, the motor 5 and the electric control handle 7 are electrically connected with the controller 8. Preferably, the controller 8 is a vehicle control unit.
In this embodiment, the solenoid valve set 6 includes four proportional pressure reducing valves, output pressures of the proportional pressure reducing valves serve as four pilot pressures of the multi-way valve 3, and the output pressure is higher as the control signals received by the proportional pressure reducing valves are larger, so as to control corresponding valve spools of the multi-way valve 3 to move. The signal of each proportional pressure reducing valve is controlled by a controller 8. The pilot pressure oil required by the solenoid valve pack 6 is provided by a further pilot pump or other pressure source.
The multi-way valve 3 comprises a tipping bucket linkage and a lifting linkage, the lifting linkage of the multi-way valve 3 can be controlled by the forward and backward swinging of the electric control handle 7, so that the lifting and descending actions of the bucket are controlled by the lifting oil cylinder 01, the tipping bucket linkage of the multi-way valve 3 can be controlled by the left and right swinging of the electric control handle 7, and the inner tipping bucket and the outer tipping bucket actions of the bucket are controlled by the tipping bucket oil cylinder 02. The output electric signal of the electric control handle 7 is increased in proportion to the increase of the swing angle, the electric signal is input into the controller 8, and the controller 8 can control the rotating speed of the motor 5 and the output pressure of the electromagnetic valve group 6 according to the electric signal of the electric control handle 7.
In the hydraulic system of the working device provided by the embodiment, the controller 8 can simultaneously control the rotating speed of the motor 5 and the action of the multi-way valve 3 according to the signal of the electric control handle 7, so that the rotating speed of the motor 5 is automatically adjusted along with the swing angle of the electric control handle 7, the rotating speed of the motor 5 does not need to be independently controlled, and the rotating speed of the motor 5 is continuously adjusted according to needs. In addition, in the embodiment, on the basis of a hydraulic system of the existing working device, a hydraulic control handle is changed into an electric control handle 7, an electromagnetic valve group 6 is added, the existing hydraulic control operation is changed into electric control operation, the universality of the existing working pump 2 and the existing hydraulic control multi-way valve 3 is kept, and the cost is low. It should be noted that, in order to maintain the generality and the control cost of the existing hydraulic control multi-way valve 3, the electromagnetic valve bank 6 and the hydraulic control multi-way valve 3 are combined to realize the function of the electric control multi-way valve in the present embodiment, and the electric control multi-way valve can also be directly used to achieve the purpose of the present embodiment.
Preferably, an oil return filter 4 is arranged on a pipeline for communicating an oil return port of the multi-way valve 3 with the oil tank 1, and is used for filtering oil liquid and prolonging the service life of the hydraulic system.
Further, the working device hydraulic system provided by the embodiment further comprises a pressure sensor 9, the pressure sensor 9 is arranged on a pipeline communicated with an oil outlet of the working pump 2 and an oil inlet of the multi-way valve 3, the pressure sensor 9 is used for detecting the pressure of the working device hydraulic system, the output torque of the motor 5 can be calculated through the pressure, the output power of the motor 5 can be calculated by combining the rotating speed of the motor 5, and the controller 8 can timely take countermeasures when the motor 5 exceeds the rated power by monitoring the output power in real time, so that the motor 5 is prevented from exceeding the rated output power, and the motor 5 is protected.
Example two
As shown in fig. 2, the present embodiment provides a control method applied to the hydraulic system of the working device according to the first embodiment, including the steps of:
and S10, starting the loader.
And S20, the rotating speed of the motor 5 is zero.
S30, judging whether an operation signal of the electric control handle 7 is received or not, and if so, entering the next step S40; if not, the process returns to the previous step S20.
S40, controlling the motor 5 to enter a standby rotating speed, judging a specific operating instruction of the electric control handle 7, and if the operating instruction is to lift or skip the bucket, entering the step S511; if the manipulation command is to lower the bucket, the process proceeds to step S521.
The standby speed is generally set low to ensure that the motor 5 starts without load and has a high response speed.
S511, the output pressure of the control solenoid valve set 6 is gradually increased to a value corresponding to the swing angle of the electric control handle 7, and then the process proceeds to step S512.
S512, the rotation speed of the control motor 5 is gradually increased to a value corresponding to the swing angle of the electric control handle 7, and then the process goes to step S60.
Step S511 and step S512 are control strategies for lifting or tipping the bucket, in which the multi-way valve 3 is fully opened first, and then the rotation speed of the motor 5 is increased, so that when the bucket is not operated at full speed, only the throttling loss occurs during the opening process of the multi-way valve 3, but since the rotation speed of the motor 5 is low, the flow rate of the working pump 2 is low, the throttling loss is small, and after the multi-way valve 3 is fully opened, and the rotation speed of the motor 5 is increased to increase the operation speed of the bucket, the throttling loss does not occur, and energy is saved.
S521, the output pressure of the control solenoid valve set 6 and the rotation speed of the motor 5 are simultaneously increased to a magnitude corresponding to the swing signal of the electric control handle 7, and then the process proceeds to step S60.
Step S621 is a control strategy when the bucket descends, and since the bucket is lowered by the weight of the bucket and the lift cylinder 01 needs to be filled with oil quickly, there is a separate control strategy when the bucket descends, and by adopting the control strategy of step S621, it can be ensured that the lift cylinder 01 is supplied with oil quickly, and sufficient hydraulic oil is provided for the descent of the bucket.
S60, after receiving a signal that the current of the electric control handle 7 is reduced to zero, judging whether the control handle is not operated for a long time, and if so, returning to the step S20; if not, the process returns to the step S40.
After steps S511 and S512 or step S521 are executed, the driver may operate the electric control handle 7 to return to the neutral position, at which time the current signal of the electric control handle 7 is reduced to zero, and the action is finished. If the electric control handle 7 is not operated within a certain time, the rotating speed of the motor 5 becomes zero until the electric control handle 7 is operated again, and more energy is saved.
In the process of executing steps S10 to S60, the controller 8 detects the output power of the motor 5 in real time, and if the detected output power exceeds the rated output power of the motor 5, controls the rotation speed of the motor 5 to be reduced to a preset range value so as to reduce the output power of the motor 5, thereby protecting the motor 5. Optionally, a pressure sensor 9 may be disposed in the working device hydraulic system, the pressure sensor 9 may be disposed on a pipeline through which an oil outlet of the working pump 2 is communicated with an oil inlet of the multi-way valve 3, the pressure sensor 9 is configured to detect a pressure of the working device hydraulic system, an output torque of the motor 5 may be calculated by using the pressure, and an output power of the motor 5 may be calculated by combining a rotation speed of the motor 5.
In the process of executing steps S10 to S60, the controller 8 detects the temperature of the motor 5 in real time, and if the detected temperature exceeds the limit temperature of the motor 5, controls the rotation speed of the motor 5 to be reduced to a preset range value so as to reduce the output power of the motor 5, thereby protecting the motor 5. Alternatively, the temperature detection may be performed by a temperature detection device provided in the motor 5. Alternatively, a temperature sensor may be provided in the motor 5 to detect the temperature.
In the process of executing steps S10 to S60, the controller 8 detects the position of the bucket in real time, and if it is detected that the bucket reaches the limit position, the rotation speed of the motor 5 is controlled to be reduced to the standby rotation speed, and the current of the solenoid valve set is controlled to be reduced to zero, so as to reduce the overflow loss and save more energy. Alternatively, limit switches may be provided at the extreme positions of the bucket.
EXAMPLE III
The embodiment provides an electric loader, which comprises the working device hydraulic system according to the first embodiment and adopts the control method of the working device hydraulic system according to the second embodiment. Through the arrangement, the controller 8 can simultaneously control the rotating speed of the motor 5 according to the signal of the electric control handle 7 and control the action of the multi-way valve 3 through controlling the electromagnetic valve group 6, so that the rotating speed of the motor 5 is automatically adjusted along with the swing angle of the electric control handle 7, the rotating speed of the motor 5 does not need to be independently controlled, and the rotating speed of the motor 5 is continuously adjusted according to the requirement; in addition, in the control strategy of bucket lifting and tipping, the multi-way valve 3 is fully opened firstly, and then the rotating speed of the motor 5 is increased, so that when the bucket does not act at full speed, only the throttling loss exists in the opening process of the multi-way valve 3, but because the rotating speed of the motor 5 is small, the flow of the working pump 2 is small, the throttling loss is small, and after the multi-way valve 3 is fully opened, when the rotating speed of the motor 5 is increased to improve the acting speed of the bucket, the throttling loss does not exist any more, and the energy is saved.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A hydraulic system of a working device is characterized by comprising an oil tank (1), a working pump (2), a multi-way valve (3), an electromagnetic valve group (6), a motor (5), an electric control handle (7) and a controller (8), wherein the motor (5) is in driving connection with the working pump (2), an oil inlet of the working pump (2) is communicated with the oil tank (1), an oil outlet of the working pump (2) is communicated with an oil inlet of the multi-way valve (3), an oil outlet of the multi-way valve (3) is connected with a lifting oil cylinder (01) and a tipping bucket oil cylinder (02), a control end of the multi-way valve (3) is communicated with the electromagnetic valve group (6), and the electromagnetic valve group (6), the motor (5) and the electric control handle (7) are all electrically connected with the controller (8);
the multi-way valve (3) comprises a tipping bucket linkage and a lifting linkage, the electric control handle (7) swings back and forth to control the lifting linkage, so that the lifting and descending actions of the bucket are controlled through the lifting oil cylinder (01), the electric control handle (7) swings left and right to control the tipping bucket linkage, and the tipping bucket cylinder (02) controls the inner tipping bucket and the outer tipping bucket of the bucket; the output electric signal of automatically controlled handle (7) increases along with the increase of swing angle scaling, controller (8) can be according to the electric signal control of automatically controlled handle (7) the rotational speed of motor (5) with the output pressure of electromagnetism valves (6).
2. The working device hydraulic system as claimed in claim 1, further comprising a pressure sensor (9), wherein the pressure sensor (9) is disposed on a pipeline on which an oil outlet of the working pump (2) communicates with an oil inlet of the multi-way valve (3).
3. The working device hydraulic system according to claim 1, further comprising an oil return filter (4), wherein the oil return filter (4) is disposed on a pipeline where an oil return port of the multi-way valve (3) communicates with the oil tank (1).
4. Work device hydraulic system according to any one of claims 1-3, characterized in that the controller (8) is a vehicle control unit.
5. A control method applied to the hydraulic system of the working device according to any one of claims 1 to 4, characterized by comprising the steps of:
s10, starting a loader;
s20, the rotating speed of the motor (5) is zero;
s30, judging whether an operation signal of the electric control handle (7) is received or not, and if so, executing the next step S40; if not, returning to the previous step S20;
s40, judging a specific operation instruction of the electric control handle (7), and if the operation instruction is to lift or dump the bucket, entering the step S511; if the manipulation instruction is to lower the bucket, step S521 is executed;
s511, gradually increasing the output pressure of the control electromagnetic valve group (6) to a value corresponding to the swing angle of the electric control handle (7), and then executing the step S512;
s512, gradually increasing the rotating speed of the control motor (5) to a size corresponding to the swing angle of the electric control handle (7), and then executing the step S60;
s521, controlling the output pressure of the electromagnetic valve group (6) and the rotating speed of the motor (5) to be simultaneously increased to the size corresponding to the swing signal of the electric control handle (7), and then executing the step S60;
s60, after receiving a signal that the current of the electric control handle (7) is reduced to zero, judging whether the electric control handle (7) is not operated for a long time, and if so, returning to the step S20; if not, the process returns to step S40.
6. The method for controlling a hydraulic system of a working device according to claim 5, wherein in step S40, the motor (5) is controlled to a standby rotational speed before a specific manipulation command of the electric control handle (7) is determined.
7. The control method of a hydraulic system of a working device according to claim 5, wherein the controller (8) detects the output power of the motor (5) in real time during the execution of steps S10 to S60, and controls the rotation speed of the motor (5) to be reduced to a preset range value if the detected output power exceeds the rated output power of the motor (5).
8. The method for controlling a hydraulic system of a working device according to claim 5, wherein the controller (8) detects the temperature of the motor (5) in real time during execution of steps S10 to S60, and controls the rotation speed of the motor (5) to be reduced to a preset range value if the detected temperature exceeds a limit temperature of the motor (5).
9. The method for controlling a hydraulic system of a working device according to claim 5, wherein in the process of executing steps S10 to S60, the controller (8) detects the position of the bucket in real time, and if the position of the bucket is detected to reach the limit position, the rotation speed of the motor (5) is controlled to be reduced to the standby rotation speed, and the current of the electromagnetic valve bank (6) is controlled to be reduced to zero.
10. An electric loader characterized by employing a control method of the work implement hydraulic system according to any one of claims 5 to 9.
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| CN202011551358.5A CN112594240B (en) | 2020-12-24 | 2020-12-24 | Hydraulic system of working device, control method and electric loader |
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| CN113982060A (en) * | 2021-11-12 | 2022-01-28 | 博雷顿科技有限公司 | Double-motor control system and method for electric loader |
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| CN112594240A (en) | 2021-04-02 |
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