CN114857066B - Hydraulic drive fan control method, heat dissipation device and working machine - Google Patents
Hydraulic drive fan control method, heat dissipation device and working machine Download PDFInfo
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- CN114857066B CN114857066B CN202210474976.7A CN202210474976A CN114857066B CN 114857066 B CN114857066 B CN 114857066B CN 202210474976 A CN202210474976 A CN 202210474976A CN 114857066 B CN114857066 B CN 114857066B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/04—Units comprising pumps and their driving means the pump being fluid-driven
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
- F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps
- F04D29/703—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps specially for fans, e.g. fan guards
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention relates to the field of equipment control, and provides a hydraulic drive fan control method, a heat dissipation device and a working machine, wherein the hydraulic drive fan control method comprises the following steps: controlling the rotation speed of the fan; acquiring a motor driving pressure value; when the motor driving pressure value is larger than or equal to a first preset pressure value, the motor is switched from positive displacement to negative displacement. The device is used for solving the defect that a fan driven by a hydraulic motor in the prior art cannot automatically reversely rotate to clean ash. According to the hydraulic drive fan control method, the fan rotating speed is controlled based on the current control temperature, after dust is accumulated on the fan, the motor driving pressure value is continuously increased to control the fan rotating speed, and when the current motor driving pressure value is greater than or equal to the first preset pressure value, the motor is gradually switched from positive displacement to negative displacement, so that the fan is gradually switched from positive rotation to reverse rotation, automatic dust removal of the fan is realized, and the control precision of heat dissipation of the fan is improved.
Description
Technical Field
The present invention relates to the field of equipment control technologies, and in particular, to a hydraulic driving fan control method, a heat dissipating device, and a working machine.
Background
In current work machines, such as excavators, conventional main excavator plants typically design cooling systems in the hydraulic excavator systems in order to bring the operating temperature of the hydraulic excavator oil to a reasonable range. The most common cooling systems employ an air cooler, and there are three general ways to drive the fan of the air cooler to rotate: one is that the engine main shaft is directly driven by a belt or a clutch; the second is driven by a hydraulic motor; the third is an electronic fan drive. Because the fan can accumulate ash in the heat dissipation process, the fan needs to be reversely rotated to remove ash regularly.
The first method of driving the fan to rotate cannot realize the reverse rotation of the fan. The second type of fan driven by a hydraulic motor, although capable of realizing reverse rotation, has a great difficulty in realizing automatic reverse rotation control in the working process. The third approach is limited by battery capacity which is not commonly used in work machines.
For a fan driven by a hydraulic motor, although the fan driven by a common reversible hydraulic motor can realize reversing, the fan needs to be reversed through a reversing valve under the condition that the fan is static, and then a variable pump is started, and vice versa, so that the fan can not automatically reverse to perform self-cleaning. Because the fan is in a forward rotating state due to inertia and in a forward rotating state, the output shaft of the motor outputs reverse power to generate instantaneous high pressure in the back pressure cavity of the motor, so that the output shaft of the hydraulic motor is damaged or impacted by hydraulic pressure, and damages such as vibration, noise and shaft breakage are caused.
Disclosure of Invention
The invention provides a hydraulic drive fan control method, a heat dissipation device and an operation machine, which are used for solving the defect that in the prior art, a hydraulic motor drives a fan to conduct hydraulic oil heat dissipation and cannot realize automatic reversal ash removal, and realizing comparison judgment based on the current driving pressure value of the motor and a first preset pressure value under the control of the rotating speed of the fan, so that the positive and negative displacement of the motor can be automatically switched, the positive and negative rotation switching of the fan can be realized, and the automatic ash removal of the fan can be realized.
The invention provides a control method of a hydraulic drive fan, which comprises the following steps:
controlling the current fan rotating speed within a preset rotating speed threshold range of the current control temperature;
acquiring a motor driving pressure value at the current fan rotating speed;
when the motor driving pressure value is greater than or equal to a first preset pressure value, the motor is switched from positive displacement to negative displacement, and the fan is driven to be switched from positive rotation to reverse rotation.
The hydraulic drive fan control method provided by the invention further comprises the following steps:
acquiring a motor driving pressure value in a reverse rotation state;
when the motor driving pressure value is smaller than or equal to a second preset pressure value, the motor is switched from negative displacement to positive displacement, and drives the fan to be switched from reverse rotation to positive rotation, or the motor is controlled to be switched from negative displacement to zero displacement, so that the fan is stopped.
According to the hydraulic drive fan control method provided by the invention, the control of the current fan rotating speed within the preset rotating speed threshold range of the current control temperature comprises the following steps:
acquiring a current control temperature and the current fan rotating speed;
based on the control temperature and fan speed curve, the current fan speed is adjusted to be within a preset speed threshold range corresponding to the current control temperature.
The invention also provides a hydraulic drive heat dissipation device, which comprises:
a fan;
the output end of the reversible variable motor is connected with the fan;
a variable pump that supplies oil to the reversible variable motor;
the controller is used for controlling the current fan rotating speed to be within a preset rotating speed threshold range of the current control temperature; the output pressure of the variable pump is obtained, and a first control signal is output based on the output pressure of the variable pump;
the reversible variable displacement motor adjusts flow and/or direction in response to the first control signal.
According to the hydraulic drive heat dissipation device provided by the invention, the reversible variable motor comprises an electromagnetic reversing end, and the electromagnetic reversing end receives the first control signal.
According to the hydraulic drive heat dissipation device provided by the invention, when the output pressure of the variable pump is larger than or equal to the first preset pressure value, the reversible variable motor is switched from positive displacement to negative displacement, and the fan is driven to be switched from positive rotation to reverse rotation.
According to the hydraulic drive heat dissipation device provided by the invention, the variable pump comprises the electric proportional overflow valve, the electric proportional overflow valve is connected with the controller, and the electric proportional overflow valve receives a second control signal sent by the controller and is used for controlling the output flow of the variable pump.
The invention provides a working machine, which comprises the hydraulic driving heat dissipation device.
The invention also provides an electronic device, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor realizes the steps of the hydraulic drive fan control method when executing the computer program.
The present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the hydraulically driven fan control method described above.
According to the hydraulic drive fan control method, the fan rotating speed is controlled based on the current control temperature, after dust is accumulated on the fan, the motor driving pressure value is continuously increased to control the fan rotating speed, the current motor driving pressure value is compared with the first preset pressure value, when the current motor driving pressure value is larger than or equal to the first preset pressure value, the motor is gradually switched from positive displacement to negative displacement, so that the fan is gradually switched from positive rotation to reverse rotation, automatic dust removal of the fan is realized, the output shaft is not damaged or impacted due to the fact that the displacement of the motor is continuously switched, the vibration amplitude and noise of the fan are reduced, and the control accuracy of heat dissipation of the fan is improved.
Further, since the hydraulic drive heat dissipating device and the working machine according to the present invention are provided with the device for realizing the hydraulic drive fan control method, the hydraulic drive heat dissipating device and the working machine according to the present invention also have various advantages as described above; the electronic device and the non-transitory computer-readable storage medium according to the present invention have various advantages as described above, since they have a program for realizing the hydraulic drive fan control method.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a hydraulic drive fan control method according to the present invention;
FIG. 2 is a graph showing the relationship between hydraulic oil temperature and fan rotation speed in the state of no dust deposit in the oil powder provided by the invention;
FIG. 3 is a graph showing the relationship between the rotational speed of a fan and the driving pressure of the motor in forward and reverse rotation;
FIG. 4 is a second flow chart of a hydraulic fan control method according to the present invention;
FIG. 5 is a third flow chart of a hydraulic fan control method according to the present invention;
FIG. 6 is a hydraulic schematic diagram of a hydraulically driven heat sink provided by the present invention;
FIG. 7 is a control block diagram of a hydraulic drive fan control method provided by the present invention;
fig. 8 is a flow chart of a hydraulic driving fan control method according to the present invention.
Reference numerals:
100: a load-sensitive variable pump; 101: a pump body; 102: an electric proportional overflow valve; 103: a load-sensitive valve; 104: a second oil outlet; 105: a pressure sensor; 200: a reversible variable displacement motor; 201: a motor body; 202: a one-way valve; 203: an electromagnetic reversing valve; 204: an electromagnetic reversing end; 205: a rotation speed sensor; 210: a first oil inlet; 211: a first oil outlet; 212: an oil drain port; 220: a second oil inlet; 221: an oil return port; 222: a third oil outlet; 300: a fan.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., are based on directions or positional relationships shown in the drawings, are merely for convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In describing embodiments of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "coupled," "coupled," and "connected" should be construed broadly, and may be either a fixed connection, a removable connection, or an integral connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in embodiments of the present invention will be understood in detail by those of ordinary skill in the art.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Embodiments of the present invention are described below with reference to fig. 1 to 8. It is to be understood that the following are only illustrative embodiments of the present invention and are not to be construed as limiting the invention.
As shown in fig. 1, the present invention provides a hydraulic drive fan control method, including:
s1: controlling the current fan 300 rotation speed within a preset rotation speed threshold range of the current control temperature;
s2: acquiring a motor driving pressure value at the current fan rotating speed;
s3: when the motor driving pressure value is greater than or equal to a first preset pressure value, the motor starts a negative displacement working mode, so that the motor is switched from positive displacement to negative displacement, and the fan 300 is driven to be switched from positive rotation to reverse rotation.
Specifically, the fan 300 dissipates heat of the hydraulic oil, and in order to maintain the hydraulic oil within a certain temperature range, after the temperature of the hydraulic oil increases, the rotation speed of the fan 300 is correspondingly increased, so as to achieve a good heat dissipation effect on the hydraulic oil. As shown in fig. 2 and 3, in a state where oil is completely dispersed, the rotational speed of the fan 300 is in one-to-one correspondence with the hydraulic oil temperature, and the rotational speed of the fan 300 is controlled by a motor driving the fan 300, and the rotational speed of the fan 300 is in one-to-one correspondence with the driving pressure of the motor. In the state that the oil is scattered and the fan 300 is loaded due to dust accumulation, after the temperature of the hydraulic oil is increased, the rotating speed of the fan 300 needs to be matched with the hydraulic oil, the fan 300 needs to obtain the matched rotating speed, and the driving pressure required by the motor is increased compared with the driving pressure value in the state that the oil is scattered cleanly. The greater the ash deposition level of the oil dispersion, the greater the driving pressure value of the motor in order to maintain the required fan speed.
In the present invention, for the closed-loop control of the fan 300, the rotation speed of the fan 300 can maintain the hydraulic oil temperature within a certain temperature range, and the rotation speed of the fan driven by the motor can reach the preset rotation speed threshold range regardless of the ash accumulation degree of the oil dispersion. The preset rotational speed of the fan 300 is obtained from the relationship between the hydraulic oil temperature and the rotational speed of the fan in the clean oil state in fig. 2.
For the first preset pressure value in the present invention, as shown in fig. 3, the first preset pressure value is determined according to a test, in a state that the fan 300 is not accumulated with ash, the rotational speed and the motor driving pressure of the fan 300 correspond to the driving pressure value curve in fig. 3, and when the rotational speed and the motor driving pressure of the fan 300 correspond to the reversing driving pressure value curve in fig. 3 after the fan 300 is continuously accumulated with ash, the motor reverses. In a state that the oil is scattered and accumulated to a certain extent and needs to be cleaned, the motor is used for achieving a driving pressure value in a reverse driving curve in fig. 3 at a preset rotating speed of the fan, namely, a first preset pressure value.
For the negative displacement working mode of the motor in the invention, the motor drives the fan 300 to radiate heat, the motor is in a positive displacement driving fan 300 to rotate positively, and when the current driving pressure value of the motor is larger than or equal to a first preset pressure value, the fan 300 needs to be reversely rotated to clean ash and self-cleaning. Therefore, the maximum positive displacement of the motor is gradually reduced until reaching zero displacement, and then the motor is gradually increased from zero displacement to negative displacement, so that the rotating speed for driving the fan 300 to rotate positively is gradually reduced until reaching zero, and the rotating speed for reversing is gradually increased from zero to realize self-cleaning ash removal of the fan 300.
As shown in fig. 4, the hydraulic driving fan control method in one embodiment of the present invention further includes:
s4: acquiring a motor driving pressure value in a reverse rotation state of the fan 300;
s5: when the motor driving pressure value is smaller than or equal to a second preset pressure value, the motor starts a positive displacement working mode, so that the motor is switched from negative displacement to positive displacement, the fan 300 is driven to be switched from reverse rotation to positive rotation, or the motor is controlled to be switched from negative displacement to zero displacement, so that the fan 300 is stopped.
In order to achieve a fast and efficient self-cleaning effect of the fan 300, the rotating speed of the fan 300 driven by the motor to rotate reversely is maintained in a state of the maximum rotating speed of the fan 300, and in a state of no dust accumulation when the fan 300 rotates reversely, the maximum rotating speed of the fan 300 has a first motor reverse driving pressure value corresponding to the first motor reverse driving pressure value, namely a second preset pressure value; in the ash deposition state of the fan 300, the maximum reverse rotation speed of the fan 300 has a corresponding second motor reverse driving pressure value, which is greater than the first motor reverse driving pressure value. After the fan 300 is self-cleaning, the accumulated ash is continuously blown down, so that the current motor reversal pressure value is equal to the first motor reversal driving pressure value, namely the second preset pressure value, and the reversal self-cleaning of the fan 300 is stopped. According to the current temperature state of the hydraulic oil, the motor can be switched from negative displacement to positive displacement to drive the fan 300 to rotate positively for heat dissipation, or the motor can be switched from negative displacement to zero displacement to stop the rotation of the fan 300.
For the positive displacement working mode of the motor in the invention, the motor gradually reduces from the maximum of negative displacement to zero displacement, gradually increases from zero displacement to positive displacement, realizes that the fan 300 gradually reduces from the maximum reverse rotation speed to zero rotation speed, gradually increases from zero rotation speed to positive rotation, and controls the magnitude of the positive rotation speed based on the temperature of hydraulic oil.
As shown in fig. 5, in another embodiment of the present invention, for the closed-loop control of the fan rotation speed in step S1, the step of controlling the current rotation speed of the fan 300 within the preset rotation speed threshold range of the current control temperature, for example, using the closed-loop control of the rotation speed of the fan 300, includes:
s11: acquiring the current control temperature and the current rotating speed of the fan 300;
s12: based on the control temperature and fan speed curve, the current fan 300 speed is adjusted to be within a preset speed threshold corresponding to the current control temperature.
Furthermore, in an alternative embodiment of the present invention, for the hydraulic oil temperature versus fan speed profile of step 12, the step of bringing the current speed of the fan 300 within the preset speed threshold comprises:
s20: determining a preset rotating speed of the fan at the current temperature based on a curve of the control temperature and the rotating speed of the fan;
s21: the current rotational speed of the fan 300 is adjusted based on the fan preset rotational speed such that the current rotational speed of the fan 300 is within the fan preset rotational speed threshold.
Specifically, a curve of the fan rotation speed and the hydraulic oil temperature in the state of no dust deposit in the oil dispersion was found according to the test, as shown in fig. 1. The current temperature of the hydraulic oil is obtained through a temperature sensor of the hydraulic oil, and the fan preset rotating speed corresponding to the obtained current temperature of the hydraulic oil is obtained in a fan rotating speed and hydraulic oil temperature curve.
Comparing the current rotation speed of the fan 300 with a preset rotation speed of the fan according to the current rotation speed of the fan 300 measured by the rotation speed sensor 205 on the motor output shaft, and keeping the driving pressure value of the motor unchanged when the current rotation speed of the fan 300 is within the preset rotation speed threshold range of the fan; when the current rotation speed of the fan 300 is lower than the preset rotation speed threshold range of the fan, at this time, the oil powder is in a dust accumulation state, and the driving pressure value of the motor is controlled to be increased, so that the current rotation speed of the fan 300 is increased and is in the preset rotation speed threshold range of the fan, and the closed-loop control of the rotation speed of the fan is realized.
As shown in fig. 6, the present invention further provides a hydraulically driven heat dissipating device, including: a fan 300, a reversible variable displacement motor 200 driving the fan 300, a variable displacement pump supplying pressure oil to the reversible variable displacement motor 200, and a controller (not shown in the drawings) controlling the reversible variable displacement motor 200 and the variable displacement pump. Specifically, the current rotational speed of the fan 300 is within a preset rotational speed threshold range of the current control temperature; the output end of the reversible variable motor 200 is used for being connected with the fan 300, and the reversible variable motor 200 adjusts the flow and/or the direction corresponding to the first control signal; switching the reversible variable displacement motor 200 between positive displacement and negative displacement, controlling the forward rotation and reverse rotation of the fan 300; the variable pump supplies oil to the reversible variable motor 200; the controller controls the current fan rotating speed to be within a preset rotating speed threshold range of the current control temperature; and obtaining the output pressure of the variable pump, and outputting a first control signal based on the output pressure of the variable pump.
In one embodiment of the present invention, when the output pressure of the variable displacement pump is greater than or equal to the first preset pressure value, the reversible variable displacement motor 200 is switched from positive displacement to negative displacement, and the fan 300 is driven to be switched from positive rotation to reverse rotation.
For the reversible variable displacement motor 200 of the present invention, the reversible variable displacement motor 200 includes a first oil inlet 210, a first oil outlet 211, and an oil drain 212, the first oil inlet 210 is connected to the second oil outlet 104 of the variable displacement pump, and the first oil outlet 211 and the oil drain 212 are both connected to the oil tank. After the reversible variable displacement motor 200 obtains the first control signal sent by the controller, the reversible variable displacement motor 200 gradually switches from positive displacement to zero displacement, from zero displacement to negative displacement, or from negative displacement to zero displacement, and from zero displacement to positive displacement based on the current working state. Thereby completing the process of gradually stopping the fan 300 from the normal rotation, gradually reversing, or gradually stopping from the reverse rotation to the normal rotation. For example, reversible variable displacement motor 200 may select the a10VER series 52 of reversible axial piston variable displacement motors (Reversible axial piston variable motor) of the doctor group (Rexroch Bosch Group) for static pressure fan drive.
The pressure sensor 105 is disposed between the second oil outlet 104 of the variable pump and the first oil inlet 210 of the reversible variable motor 200, the pressure sensor 105 obtains an output pressure of the variable pump, that is, a driving pressure value of the motor, the pressure sensor 105 sends a pressure signal to the controller, and the controller determines based on the pressure value of the pressure signal and the first preset pressure value or the second preset pressure value, sends a first control signal to the reversible variable motor 200, and controls the reversible variable motor 200.
Additionally, in other alternative embodiments of the present invention, the reversible variable motor 200 includes an electromagnetic commutation terminal 204, the electromagnetic commutation terminal 204 receiving the first control signal. Specifically, the reversible variable displacement motor 200 comprises a motor body 201 and an electromagnetic directional valve 203, the electromagnetic directional valve 203 comprises a second oil inlet 220, an oil return port 221 and a third oil outlet 222, the second oil inlet 220 is communicated with the second oil outlet 104 of the variable displacement pump, the oil return port 221 is communicated with the oil drain port 212, the third oil outlet 222 is communicated with the motor body 201, the oil return port 221 is communicated with the third oil outlet 222 in the state of a first working position of the electromagnetic directional valve 203, and the second oil inlet 220 is blocked; in the state of the second operating position of the electromagnetic directional valve 203, the oil return port 221 is blocked, and the second oil inlet 220 communicates with the third oil outlet 222. The electromagnetic directional valve 203 comprises an electromagnetic directional end 204 for receiving the first control signal, and after the electromagnetic directional valve 203 obtains the first control signal, the electromagnetic directional valve 203 is electrically in the second working position. The pressure oil of the variable displacement pump enters the motor body 201 through the electromagnetic directional valve 203, the swash plate of the motor body 201 is pushed to gradually switch from positive displacement to negative displacement, and when the swash plate reaches the main shaft position of the motor body 201, the displacement of the motor body 201 is zero.
After the electromagnetic directional valve 203 loses the first control signal, the electromagnetic directional valve 203 is powered off and is in the first working position, and the swash plate of the motor body 201 returns from the negative displacement to the positive displacement across the main shaft. Wherein, the reversible variable displacement motor 200 is provided with a one-way valve 202 between the first oil inlet 210 and the first oil outlet 211.
With continued reference to FIG. 6, in one embodiment of the invention, the variable displacement pump includes an electric proportional relief valve 102, the electric proportional relief valve 102 being coupled to the controller, the electric proportional relief valve 102 receiving a second control signal from the controller for controlling the output flow of the variable displacement pump.
The variable pump may be a load-sensitive variable pump 100, including a pump body 101, a load-sensitive valve 103 and an electric proportional overflow valve 102, where the load-sensitive valve 103 performs load-sensitive adjustment on the pump body 101, a load-sensitive port of the load-sensitive valve 103 is connected with a second oil outlet 104, and a pressure sensor 105 is disposed at a connection point of the load-sensitive port and the second oil outlet 104. During the process of the reversible variable displacement motor 200 gradually decreasing from positive displacement to negative displacement, as the displacement of the reversible variable displacement motor 200 decreases and the pressure of the second oil outlet 104 increases, the controller adjusts the current of the electric proportional relief valve 102 to decrease, the degree of which is inversely proportional to the pressure of the pressure sensor 105; and thus adjusts the output flow rate of the variable displacement pump to decrease to accommodate changes in the flow rate of the reversible variable displacement motor 200. The electric proportional relief valve 102 is adjusted similarly after the displacement of the reversible variable displacement motor 200 is raised.
The invention also provides a working machine, which comprises the hydraulic drive heat dissipation device of the embodiment. The work machine may be a construction machine such as a crane, an excavator, a pile machine, or a construction vehicle such as a boarding car, a fire truck, a mixer truck, or the like.
The invention also provides an electronic device comprising a memory, a processor and a computer program stored on the memory and running on the processor, wherein the processor executes the computer program to realize the steps of the hydraulic drive fan control method of the embodiment.
The present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the hydraulically driven fan control method of the above embodiments.
As shown in fig. 7 and 8, for example, when the excavator works, the hydraulic drive fan control method combined with the hydraulic drive heat sink specifically includes:
for example, when the hydraulic oil temperature reaches 60 degrees celsius (i.e., 60 degrees celsius), the fan speed is controlled to 1059 revolutions per minute (i.e., 1059 rpm) by a fan speed versus hydraulic oil temperature profile. Meanwhile, according to the curve of the motor driving pressure and the fan rotating speed, the motor driving pressure is 16.3 megapascals (namely 16.3 MPa).
Because the excavator has a bad working environment, the oil is slowly scattered and accumulated. At a current temperature of the hydraulic oil of 60 c and a rotational speed of 1059rpm, the pressure of the hydraulic system starts to rise, i.e. the driving pressure of the motor starts to rise. When the pressure rises to a first preset pressure value of 18.3 MPa. The electromagnetic directional valve 203 starts to obtain the first control signal energization.
When the electromagnetic directional valve 203 starts to be energized, the displacement of the reversible variable displacement motor 200 starts to decrease from the forward direction. During this process, system pressure begins to increase, while the controller sends a second control signal to the electro-proportional relief valve 102 to control the variable pump displacement to begin to decrease.
When the reversible variable displacement motor 200 displacement is reduced from positive to zero displacement and increased from zero displacement. The pressure of the hydraulic system begins to drop and simultaneously the electric proportional relief valve 102 controls the displacement of the variable displacement pump to increase and the motor controls the maximum reverse rotational speed of the fan 300 to 1800rpm.
The motor driving pressure of the clean oil dispersion fan 300 at 1800rpm was measured by the test to be 21.5MPa when the fan 300 was reversed. After the dust is deposited, the fan 300 reversely rotates to a common pressure of more than 23MPa at 1800 revolutions, and when the dust is blown less after the fan 300 reversely rotates to blow dust, the load of the fan 300 is smaller. When the system pressure starts to drop and falls to 21.5MPa, the electromagnetic directional valve 203 is powered off, and the fan 300 starts to resume normal rotation.
In addition, 21.5MPa is not set as the reverse soot blowing stop pressure in general for the stability of the whole control system. Typically 0.5MPa is added as the reverse sootblowing stopping pressure, i.e. the second preset pressure value, on the basis of this pressure.
According to the hydraulic drive fan control method provided by the invention, the fan rotating speed is controlled based on the current control temperature, after the fan 300 deposits dust, the motor driving pressure value is continuously increased to control the fan rotating speed, the current motor driving pressure value is compared with the first preset pressure value, when the current motor driving pressure value is greater than or equal to the first preset pressure value, the negative displacement working mode of the motor is started, so that the motor is gradually switched from positive displacement to negative displacement, the fan 300 is gradually switched from positive rotation to reverse rotation, the reverse rotation of the fan 300 is automatically cleaned, the output shaft is not damaged or impacted due to the fact that the displacement of the motor is continuously switched, the vibration amplitude and noise of the fan 300 are reduced, and the control precision of heat dissipation of the fan 300 is improved.
Further, since the hydraulic drive heat dissipating device and the working machine according to the present invention are provided with the device for realizing the hydraulic drive fan control method, the hydraulic drive heat dissipating device and the working machine according to the present invention also have various advantages as described above; the electronic device and the non-transitory computer-readable storage medium according to the present invention have various advantages as described above, since they have a program for realizing the hydraulic drive fan control method.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A hydraulically driven fan control method, comprising:
controlling the current fan rotating speed within a preset rotating speed threshold range corresponding to the current control temperature;
acquiring a motor driving pressure value at the current fan rotating speed;
when the motor driving pressure value is larger than or equal to a first preset pressure value, the motor is switched from positive displacement to negative displacement, and the fan is driven to be switched from positive rotation to reverse rotation;
when the oil is scattered and accumulated to a state needing to be cleaned, the motor is a driving pressure value in a reverse driving curve at the preset rotating speed of the fan, namely the first preset pressure value.
2. The hydraulically driven fan control method of claim 1, further comprising:
acquiring a motor driving pressure value in a reverse rotation state;
when the motor driving pressure value is smaller than or equal to a second preset pressure value, the motor is switched from negative displacement to positive displacement, and drives the fan to be switched from reverse rotation to positive rotation, or the motor is controlled to be switched from negative displacement to zero displacement, so that the fan is stopped.
3. The hydraulically driven fan control method according to claim 1 or 2, wherein the controlling the current fan speed within a preset speed threshold range of the current control temperature comprises:
acquiring a current control temperature and the current fan rotating speed;
based on the control temperature and fan speed curve, the current fan speed is adjusted to be within a preset speed threshold range corresponding to the current control temperature.
4. A hydraulically driven heat sink comprising:
a fan controlled by the hydraulically driven fan control method according to any one of claims 1 to 3;
the output end of the reversible variable motor is connected with the fan;
a variable pump that supplies oil to the reversible variable motor;
the controller is used for controlling the current fan rotating speed to be within a preset rotating speed threshold range of the current control temperature; the output pressure of the variable pump is obtained, and a first control signal is output based on the output pressure of the variable pump;
the reversible variable displacement motor adjusts flow and/or direction in response to the first control signal.
5. The hydraulically driven heat sink of claim 4, wherein the reversible variable displacement motor switches from positive displacement to negative displacement when the variable displacement pump output pressure is greater than or equal to a first preset pressure value, driving the fan to switch from forward rotation to reverse rotation.
6. The hydraulically driven heat sink of claim 5, wherein the reversible variable motor comprises an electromagnetic reversing end that receives the first control signal.
7. The hydraulically driven heat sink of claim 5 or 6, wherein the variable pump comprises an electro-proportional relief valve, the electro-proportional relief valve being coupled to the controller, the electro-proportional relief valve receiving a second control signal from the controller for controlling the output flow of the variable pump.
8. A work machine comprising the hydraulically driven heat sink of any one of claims 4 to 7.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the hydraulically driven fan control method of any of claims 1 to 3 when the computer program is executed.
10. A non-transitory computer readable storage medium having stored thereon a computer program, characterized in that the computer program, when executed by a processor, implements the steps of the hydraulically driven fan control method of any one of claims 1 to 3.
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