CN117514979A - Thermal management method, controller and thermal management system of electric excavator - Google Patents
Thermal management method, controller and thermal management system of electric excavator Download PDFInfo
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- CN117514979A CN117514979A CN202311245590.XA CN202311245590A CN117514979A CN 117514979 A CN117514979 A CN 117514979A CN 202311245590 A CN202311245590 A CN 202311245590A CN 117514979 A CN117514979 A CN 117514979A
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- 238000007726 management method Methods 0.000 title claims abstract description 59
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 188
- 239000000110 cooling liquid Substances 0.000 claims abstract description 153
- 239000003921 oil Substances 0.000 claims abstract description 54
- 230000001276 controlling effect Effects 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 23
- 230000001105 regulatory effect Effects 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 239000002826 coolant Substances 0.000 claims description 20
- 238000004891 communication Methods 0.000 claims description 7
- 239000012809 cooling fluid Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 abstract description 9
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 238000010792 warming Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 10
- 238000004590 computer program Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- F15B21/042—Controlling the temperature of the fluid
- F15B21/0427—Heating
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/226—Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating
-
- 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
- F15B21/02—Servomotor systems with programme control derived from a store or timing device; Control devices therefor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Power Engineering (AREA)
- Operation Control Of Excavators (AREA)
Abstract
The application discloses a thermal management method, a controller and a thermal management system of an electric excavator. The method comprises the following steps: acquiring the hydraulic oil temperature of hydraulic oil in a hydraulic oil tank; and under the condition that the hydraulic oil temperature is lower than the first preset oil temperature, adjusting the flow of the cooling liquid in the first branch and the flow of the cooling liquid in the second branch by controlling the opening degree of the reversing valve so as to heat the hydraulic oil in the hydraulic oil tank through the cooling liquid flowing in the first branch. According to the hydraulic oil temperature control device, the flow of the cooling liquid passing through the hydraulic oil tank can be regulated through the electronic control proportional reversing valve according to the hydraulic oil temperature, the hydraulic oil is heated through the heat of the cooling liquid, the heating speed of the hydraulic oil in a low-temperature environment is improved, the time for waiting for warming up is shortened, the machine can quickly reach a normal working state, meanwhile, the working load of an electronic fan is reduced, and the energy consumption is reduced.
Description
Technical Field
The application relates to the technical field of engineering machinery, in particular to a thermal management method, a controller and a thermal management system of an electric excavator.
Background
In an electric excavator of engineering machinery, when the temperature of hydraulic oil of an excavator hydraulic system is low, viscosity is increased, fluidity is deteriorated, working efficiency of the hydraulic system is reduced, in winter, if the temperature of the hydraulic oil is too low, when the excavator is started in a cold state, problems that the hydraulic system does not act, cannot work normally and the like can occur, and a conventional method is to increase the temperature of hydraulic oil through a long-time warm-up operation after the excavator is started, but the problems of long waiting time and fuel consumption waste exist. On the other hand, the driving motor and the motor controller of the electric excavator can generate a large amount of heat in working engineering, the cooling system circulates through cooling liquid in the driving system, so that the cooling liquid takes away the heat of the driving motor and the motor controller when the cooling liquid circulates in the system, and the cooling liquid is cooled through the radiator and the electronic fan, so that the heat dissipation of the driving motor and the motor controller is realized, but the heat generated by the driving motor and the motor controller cannot be effectively utilized.
Disclosure of Invention
The embodiment of the application aims to provide a thermal management method, a controller and a thermal management system of an electric excavator, which are used for solving the problems that in the prior art, the heating time of hydraulic oil is long and fuel consumption is wasted.
In order to achieve the above object, a first aspect of the present application provides a thermal management method for an electric excavator, which is applied to a controller of the electric excavator, where the controller is in communication connection with a thermal management system of the electric excavator, the thermal management system includes an electric water pump, a return line, and a reversing valve, the return line is in communication with a hydraulic oil tank and a driving module of the electric excavator, the return line includes a first branch and a second branch, the first branch is in communication with the hydraulic oil tank, the reversing valve is disposed between a liquid inlet of the first branch and a liquid inlet of the second branch, the reversing valve is used to adjust a flow rate of a cooling liquid in the first branch and a flow rate of a cooling liquid in the second branch, and the electric water pump is used to drive the cooling liquid to circulate in the return line, the method includes:
acquiring the hydraulic oil temperature of hydraulic oil in a hydraulic oil tank;
and under the condition that the hydraulic oil temperature is lower than the first preset oil temperature, adjusting the flow of the cooling liquid in the first branch and the flow of the cooling liquid in the second branch by controlling the opening degree of the reversing valve so as to heat the hydraulic oil in the hydraulic oil tank through the cooling liquid flowing in the first branch.
In this embodiment of the present application, when the hydraulic oil temperature is lower than the first preset oil temperature, by controlling the opening degree of the reversing valve, adjusting the flow rate of the cooling liquid in the first branch and the flow rate of the cooling liquid in the second branch, so as to heat the hydraulic oil in the hydraulic oil tank by the cooling liquid flowing in the first branch includes:
under the condition that the hydraulic oil temperature is lower than the first preset oil temperature, closing the second branch by controlling the opening degree of the reversing valve;
under the condition that the hydraulic oil temperature is higher than the second preset oil temperature, closing the first branch by controlling the opening degree of the reversing valve;
wherein the second preset oil temperature is greater than the first preset oil temperature.
In this embodiment of the present application, when the hydraulic oil temperature is lower than the first preset oil temperature, by controlling the opening of the reversing valve, the flow rate of the cooling liquid in the first branch and the flow rate of the cooling liquid in the second branch are adjusted, so that the hydraulic oil in the hydraulic oil tank is heated by the cooling liquid flowing in the first branch further includes:
and under the condition that the hydraulic oil temperature is higher than the first preset oil temperature and lower than the second preset oil temperature, adjusting the flow of the cooling liquid in the first branch and the flow of the cooling liquid in the second branch by controlling the opening degree of the reversing valve so as to heat the hydraulic oil in the hydraulic oil tank through the cooling liquid flowing in the first branch.
In an embodiment of the present application, the thermal management system of the electric excavator further includes an electronic fan, the electronic fan is connected to the return line and the driving module respectively, and the thermal management method further includes:
acquiring the temperature of the cooling liquid in the return pipeline;
and controlling the working state of the electronic fan according to the temperature of the cooling liquid so that the temperature of the cooling liquid in the return pipeline is lower than the preset temperature.
In this embodiment of the present application, controlling the working state of the electronic fan according to the temperature of the cooling liquid, so that the temperature of the cooling liquid in the return line is lower than a preset temperature includes:
and under the condition that the temperature of the cooling liquid is higher than or equal to the preset temperature, controlling the electronic fan to be started, and regulating the rotating speed of the electronic fan according to the temperature of the cooling liquid so as to enable the temperature of the cooling liquid in the return pipeline to be lower than the preset temperature.
In this embodiment of the present application, controlling the working state of the electronic fan according to the temperature of the cooling liquid, so that the temperature of the cooling liquid in the return line is lower than a preset temperature further includes:
and under the condition that the temperature of the cooling liquid is lower than the preset temperature, the electronic fan is controlled to be turned off so that the temperature of the cooling liquid in the return pipeline is lower than the preset temperature.
A second aspect of the present application provides a controller comprising:
a memory configured to store instructions; and
and a processor configured to call the instructions from the memory and to enable the thermal management method of the electric excavator according to the above when executing the instructions.
A third aspect of the present application provides a thermal management system for an electric excavator, comprising:
a controller according to the above;
the return pipeline comprises a first branch and a second branch, and the first branch is communicated with the hydraulic oil tank;
an electric water pump configured to drive the cooling liquid to circulate in the return line;
the reversing valve is arranged between the liquid inlet of the first branch and the liquid inlet of the second branch and is configured to adjust the flow of the cooling liquid in the first branch and the flow of the cooling liquid in the second branch.
In an embodiment of the present application, the thermal management system further includes:
and the electronic fan is connected with the return pipeline and the driving module respectively and is configured to reduce the temperature of the cooling liquid in the return pipeline.
A fourth aspect of the present application provides an electric excavator, comprising:
a thermal management system according to the above;
the hydraulic oil tank is communicated with a return pipeline of the thermal management system; and
and the driving module is communicated with a return pipeline of the thermal management system.
A fifth aspect of the present application provides a machine-readable storage medium having stored thereon instructions for causing a machine to perform the above-described method of thermal management of an electric shovel.
Through the technical scheme, the hydraulic oil temperature of the hydraulic oil in the hydraulic oil tank is obtained; and under the condition that the hydraulic oil temperature is lower than the first preset oil temperature, adjusting the flow of the cooling liquid in the first branch and the flow of the cooling liquid in the second branch by controlling the opening degree of the reversing valve so as to heat the hydraulic oil in the hydraulic oil tank through the cooling liquid flowing in the first branch. According to the hydraulic oil temperature control device, the flow of the cooling liquid passing through the hydraulic oil tank can be regulated through the electronic control proportional reversing valve according to the hydraulic oil temperature, the hydraulic oil is heated through the heat of the cooling liquid, the heating speed of the hydraulic oil in a low-temperature environment is improved, the time for waiting for warming up is shortened, the machine can quickly reach a normal working state, meanwhile, the working load of an electronic fan is reduced, and the energy consumption is reduced.
Additional features and advantages of embodiments of the present application will be set forth in the detailed description that follows.
Drawings
The accompanying drawings are included to provide a further understanding of embodiments of the present application and are incorporated in and constitute a part of this specification, illustrate embodiments of the present application and together with the description serve to explain, without limitation, the embodiments of the present application. In the drawings:
FIG. 1 schematically illustrates a piping structure diagram of an electric excavator according to an embodiment of the present application;
FIG. 2 schematically illustrates a flow chart of a method of thermal management of an electric excavator in accordance with an embodiment of the present application;
FIG. 3 schematically illustrates a flow chart of a method of thermal management of an electric excavator in accordance with a specific embodiment of the present application;
fig. 4 schematically shows a block diagram of a controller according to an embodiment of the present application.
Description of the reference numerals
1. The motor controller 2 drives a motor
3. Hydraulic oil temperature sensor of hydraulic oil tank 4
5. First branch 6 reversing valve
7. Second branch of electric water pump 8
9. Cooling liquid temperature sensor of return line 10
11. Radiator 12 fan
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it should be understood that the specific implementations described herein are only for illustrating and explaining the embodiments of the present application, and are not intended to limit the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.
It should be noted that, in the embodiment of the present application, directional indications (such as up, down, left, right, front, and rear … …) are referred to, and the directional indications are merely used to explain the relative positional relationship, movement conditions, and the like between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be regarded as not exist and not within the protection scope of the present application.
Fig. 1 schematically illustrates a piping structure diagram of an electric excavator according to an embodiment of the present application. As shown in fig. 1, the electric excavator according to the embodiment of the present application includes a thermal management system, a driving module, a hydraulic tank 3, and a controller (not shown in the drawings). Wherein the driving module comprises a motor controller 1 and a driving motor 2. The hydraulic oil tank 3 is provided with a hydraulic oil temperature sensor 4. The heat management system comprises an electric water pump 7, a return pipeline 9, a reversing valve 6, a radiator 11 and an electronic fan 12, wherein the return pipeline 9 comprises a first branch 5 and a second branch 8, the reversing valve 6 is arranged between a liquid inlet of the first branch 5 and a liquid inlet of the second branch 8, a hydraulic oil tank 3 is arranged on the first branch 5, the electronic fan 12 is a part of the radiator, and a cooling liquid temperature sensor 10 is arranged at a water inlet of the radiator 11. In this embodiment of the application, electric water pump 7 drives the coolant liquid and circulates in the pipeline as the power supply that the coolant liquid flows, and reversing valve 6 that electric water pump 7's delivery port set up can control the flow of coolant liquid flow to first branch road 5 and second branch road 8, and the direct flow of second branch road 8 is dispelled the heat to the radiator, and first branch road 5 flows to hydraulic tank. The hydraulic oil temperature is acquired through the hydraulic oil temperature sensor 4 and then fed back to the controller, and the controller outputs an electric signal to control the reversing valve 4 to close or adjust the flow of the first branch 5 and the second branch 8. Preferably, the reversing valve 4 may be an electronically controlled proportional reversing valve. The coolant temperature sensor 10 is used for detecting the temperature of the coolant flowing into the radiator 11, and then feeding back the temperature to the controller, and the controller outputs an electrical signal according to the received temperature to control the electronic fan 12 to operate.
Fig. 2 schematically illustrates a flow chart of a method of thermal management of an electric excavator according to an embodiment of the present application. As shown in fig. 2, an embodiment of the present application provides a thermal management method of an electric excavator, which is applied to a controller of the electric excavator, where the controller is in communication connection with a thermal management system of the electric excavator, the thermal management system includes an electric water pump, a return line and a reversing valve, the return line is communicated with a hydraulic oil tank and a driving module of the electric excavator, the return line includes a first branch and a second branch, the first branch is communicated with the hydraulic oil tank, the reversing valve is disposed between a liquid inlet of the first branch and a liquid inlet of the second branch, the reversing valve is used to adjust a flow rate of a cooling liquid in the first branch and a flow rate of a cooling liquid in the second branch, and the electric water pump is used to drive the cooling liquid to circulate in the return line.
Step 201, acquiring the hydraulic oil temperature of hydraulic oil in a hydraulic oil tank;
and 202, under the condition that the hydraulic oil temperature is lower than a first preset oil temperature, adjusting the flow of the cooling liquid in the first branch and the flow of the cooling liquid in the second branch by controlling the opening degree of the reversing valve so as to heat the hydraulic oil in the hydraulic oil tank through the cooling liquid flowing in the first branch.
In an electric excavator of engineering machinery, if the hydraulic oil temperature is too low, when the excavator is started in a cold state, the hydraulic system can not act, and the problems that the hydraulic system cannot work normally and the like can occur. In the prior art, the temperature of the hydraulic oil is mainly increased through a warm-up operation, but the problem of long waiting time and waste of fuel consumption exists. Meanwhile, the driving motor and the motor controller of the electric excavator can generate a large amount of heat in working engineering, the cooling system circulates through cooling liquid in the driving system, so that the cooling liquid takes away the heat of the driving motor and the motor controller when the cooling liquid circulates in the system, and the cooling liquid is cooled through the radiator and the electronic fan, so that the heat dissipation of the driving motor and the motor controller is realized, but the heat generated by the driving motor and the motor controller cannot be effectively utilized. Based on the above, the application provides a thermal management method of an electric excavator, which is applied to a controller of the electric excavator, wherein the controller is in communication connection with a thermal management system of the electric excavator, the thermal management system comprises an electric water pump, a return pipeline and a reversing valve, the return pipeline is communicated with a hydraulic oil tank and a driving module of the electric excavator, the return pipeline comprises a first branch and a second branch, the first branch is communicated with the hydraulic oil tank, the reversing valve is arranged between a liquid inlet of the first branch and a liquid inlet of the second branch, the reversing valve is used for adjusting the flow of cooling liquid in the first branch and the flow of cooling liquid in the second branch, and the electric water pump is used for driving the cooling liquid to circularly flow in the return pipeline. The heat generated when the driving module works is utilized to heat the hydraulic oil in the hydraulic oil tank, so that the problems of low temperature, slower temperature rise and longer warm-up time of the hydraulic oil in a low-temperature environment can be solved.
In this embodiment of the present application, the controller may obtain a temperature of hydraulic oil in the hydraulic oil tank, and adjust a flow rate of the cooling liquid in the first branch and a flow rate of the cooling liquid in the second branch according to an opening degree of the hydraulic oil temperature control reversing valve, so as to heat the hydraulic oil in the hydraulic oil tank by the cooling liquid flowing in the first branch. Specifically, when the hydraulic oil temperature is lower than the first preset oil temperature, the temperature of the hydraulic oil is lower, and heating is required, at this time, the controller controls the second branch to be closed so as to prevent the second branch from flowing, so that the flow rate of the first branch is maximum, and the large-flow cooling liquid flows through the hydraulic oil tank to heat the hydraulic oil in the hydraulic oil tank. When the hydraulic oil temperature is higher than the second preset oil temperature, the hydraulic oil in the hydraulic oil tank does not need to be heated, at the moment, the opening of the reversing valve can be controlled to enable the first branch to be closed, and no cooling fluid flows through the hydraulic oil tank to heat the hydraulic oil. It should be noted that the first preset oil temperature is the lowest temperature of the hydraulic oil in the preset hydraulic oil tank, and when the hydraulic oil is lower than the first preset oil temperature, it indicates that the hydraulic oil needs to be heated; the second preset oil temperature is the highest temperature of the preset hydraulic oil, and when the hydraulic oil is higher than the second preset oil temperature, the hydraulic oil does not need to be heated.
Through the technical scheme, the hydraulic oil temperature of the hydraulic oil in the hydraulic oil tank is obtained; and under the condition that the hydraulic oil temperature is lower than the first preset oil temperature, adjusting the flow of the cooling liquid in the first branch and the flow of the cooling liquid in the second branch by controlling the opening degree of the reversing valve so as to heat the hydraulic oil in the hydraulic oil tank through the cooling liquid flowing in the first branch. According to the hydraulic oil temperature control device, the flow of the cooling liquid passing through the hydraulic oil tank can be regulated through the electronic control proportional reversing valve according to the hydraulic oil temperature, the hydraulic oil is heated through the heat of the cooling liquid, the heating speed of the hydraulic oil in a low-temperature environment is improved, the time for waiting for warming up is shortened, the machine can quickly reach a normal working state, meanwhile, the working load of an electronic fan is reduced, and the energy consumption is reduced.
In this embodiment of the present application, when the hydraulic oil temperature is lower than the first preset oil temperature, by controlling the opening degree of the reversing valve, adjusting the flow rate of the cooling liquid in the first branch and the flow rate of the cooling liquid in the second branch, so as to heat the hydraulic oil in the hydraulic oil tank by the cooling liquid flowing in the first branch may include:
under the condition that the hydraulic oil temperature is lower than the first preset oil temperature, closing the second branch by controlling the opening degree of the reversing valve;
under the condition that the hydraulic oil temperature is higher than the second preset oil temperature, closing the first branch by controlling the opening degree of the reversing valve;
in this embodiment of the present application, when the hydraulic oil temperature is lower than the first preset oil temperature, by controlling the opening of the reversing valve, adjusting the flow rate of the cooling liquid in the first branch and the flow rate of the cooling liquid in the second branch, so as to heat the hydraulic oil in the hydraulic oil tank by the cooling liquid flowing in the first branch may further include:
and under the condition that the hydraulic oil temperature is higher than the first preset oil temperature and lower than the second preset oil temperature, adjusting the flow of the cooling liquid in the first branch and the flow of the cooling liquid in the second branch by controlling the opening degree of the reversing valve so as to heat the hydraulic oil in the hydraulic oil tank through the cooling liquid flowing in the first branch.
Wherein the second preset oil temperature is greater than the first preset oil temperature.
In the embodiment of the application, when the temperature of the hydraulic oil is low and heating is required, the second branch is closed to prevent the hydraulic oil from flowing, and at the moment, the flow of the first branch is maximum; when the temperature of the hydraulic oil is gradually increased, the second branch is opened to reduce the flow of the first branch; when the hydraulic oil temperature sensor detects that the hydraulic oil temperature reaches the set value and does not need to be heated, the first branch is closed, and at the moment, the flow of the second branch is maximum. Specifically, when the hydraulic oil temperature is lower than the first preset oil temperature, the opening degree of the reversing valve can be controlled to enable the second branch to be closed so as to enable the flow rate of the first branch to be maximum, and at the moment, a large flow of cooling liquid flows through the hydraulic oil tank to heat the hydraulic oil in the hydraulic oil tank. When the hydraulic oil temperature is higher than the second preset oil temperature, the hydraulic oil in the hydraulic oil tank does not need to be heated, at the moment, the opening of the reversing valve can be controlled to enable the first branch to be closed, and no cooling fluid flows through the hydraulic oil tank to heat the hydraulic oil. It should be noted that the first preset oil temperature is the lowest temperature of the hydraulic oil in the preset hydraulic oil tank, and when the hydraulic oil is lower than the first preset oil temperature, it indicates that the hydraulic oil needs to be heated; the second preset oil temperature is the highest temperature of the preset hydraulic oil, and when the hydraulic oil is higher than the second preset oil temperature, the hydraulic oil does not need to be heated.
Further, when the hydraulic oil temperature is higher than the first preset oil temperature and lower than the second preset oil temperature, the opening of the reversing valve can be controlled according to the real-time oil temperature of the hydraulic oil so as to dynamically adjust the flow of the cooling liquid in the first branch and the flow of the cooling liquid in the second branch, so that the hydraulic oil in the hydraulic oil tank is heated through the cooling liquid flowing in the first branch, which is equivalent to the heating rate adjustment, the hydraulic oil can be accurately controlled to be in a preset oil temperature interval, the heating speed of the hydraulic oil in a low-temperature environment is improved, the machine can quickly reach a normal working state, and the time waiting for warming up is shortened.
In an embodiment of the present application, the thermal management system of the electric excavator further includes an electronic fan, where the electronic fan is connected to the return line and the driving module respectively, and the thermal management method may further include:
acquiring the temperature of the cooling liquid in the return pipeline;
and controlling the working state of the electronic fan according to the temperature of the cooling liquid so that the temperature of the cooling liquid in the return pipeline is lower than the preset temperature.
Specifically, the electronic fan is connected with the return pipeline and the driving module respectively, the electronic fan is a part of the radiator, and the electronic fan and the radiator are both used for radiating the cooling liquid. In this embodiment of the present application, the operating power of the radiator is unchanged, and only the rotational speed of the electronic fan is changed to cool the cooling liquid. The cooling liquid temperature sensor can detect the temperature of the cooling liquid flowing into the radiator and the electronic fan, and then feeds the temperature back to the controller, and the controller outputs an electric signal according to the received temperature to control the working state of the electronic fan so that the temperature of the cooling liquid in the return pipeline is lower than the preset temperature.
In this embodiment of the present application, controlling the working state of the electronic fan according to the temperature of the cooling liquid, so that the temperature of the cooling liquid in the return line is lower than the preset temperature may include:
and under the condition that the temperature of the cooling liquid is higher than or equal to the preset temperature, controlling the electronic fan to be started, and regulating the rotating speed of the electronic fan according to the temperature of the cooling liquid so as to enable the temperature of the cooling liquid in the return pipeline to be lower than the preset temperature.
In this embodiment of the present application, controlling the working state of the electronic fan according to the temperature of the cooling liquid, so that the temperature of the cooling liquid in the return line is lower than the preset temperature may further include:
and under the condition that the temperature of the cooling liquid is lower than the preset temperature, the electronic fan is controlled to be turned off so that the temperature of the cooling liquid in the return pipeline is lower than the preset temperature.
Specifically, the controller may control the operating state of the electronic fan according to the temperature of the cooling liquid, so that the temperature of the cooling liquid in the return line is lower than a preset temperature. When the temperature of the cooling liquid is higher than or equal to the preset temperature, the temperature of the cooling liquid exceeds the preset temperature, the temperature needs to be reduced, at the moment, the controller controls the electronic fan to be started, and the rotating speed of the electronic fan is regulated according to the temperature of the cooling liquid, so that the temperature of the cooling liquid in the return pipeline is lower than the preset temperature. When the temperature of the cooling liquid is lower than the preset temperature, the cooling liquid is in a reasonable range, cooling is not needed, and at the moment, the controller controls the electronic fan to be turned off, so that the work load of the electronic fan is reduced, the energy consumption is reduced, and the endurance time is prolonged.
Fig. 3 schematically illustrates a flow chart of a method of thermal management of an electric excavator in accordance with a specific embodiment of the present application. As shown in fig. 3, the electric water pump is used as a power source for flowing the cooling liquid to drive the cooling liquid to circulate in the pipeline, the reversing valve arranged at the water outlet of the electric water pump can control the flow of the cooling liquid to the first branch and the second branch, the second branch directly flows to the radiator to radiate heat, and the first branch flows to the hydraulic oil tank. The hydraulic oil temperature is acquired through the hydraulic oil temperature sensor, and then fed back to the controller through the data acquisition unit, and the controller outputs an electric signal to control the reversing valve to close or adjust the flow of the first branch and the second branch. Preferably, the reversing valve may be an electronically controlled proportional reversing valve. The cooling liquid temperature sensor is used for detecting the temperature of cooling liquid flowing into the radiator, and the temperature is fed back to the controller through the data acquisition device, and the controller outputs an electric signal according to the received temperature to control the electronic fan to work.
Fig. 4 schematically shows a block diagram of a controller according to an embodiment of the present application. As shown in fig. 4, an embodiment of the present application provides a controller, which may include:
a memory 410 configured to store instructions; and
the processor 420 is configured to call instructions from the memory 410 and when executing the instructions, to enable the thermal management method of the electric shovel described above.
Specifically, in embodiments of the present application, the processor 420 may be configured to:
acquiring the hydraulic oil temperature of hydraulic oil in a hydraulic oil tank;
and under the condition that the hydraulic oil temperature is lower than the first preset oil temperature, adjusting the flow of the cooling liquid in the first branch and the flow of the cooling liquid in the second branch by controlling the opening degree of the reversing valve so as to heat the hydraulic oil in the hydraulic oil tank through the cooling liquid flowing in the first branch.
Further, the processor 420 may be further configured to:
under the condition that the hydraulic oil temperature is lower than the first preset oil temperature, closing the second branch by controlling the opening degree of the reversing valve;
under the condition that the hydraulic oil temperature is higher than the second preset oil temperature, closing the first branch by controlling the opening degree of the reversing valve;
wherein the second preset oil temperature is greater than the first preset oil temperature.
Further, the processor 420 may be further configured to:
and under the condition that the hydraulic oil temperature is higher than the first preset oil temperature and lower than the second preset oil temperature, adjusting the flow of the cooling liquid in the first branch and the flow of the cooling liquid in the second branch by controlling the opening degree of the reversing valve so as to heat the hydraulic oil in the hydraulic oil tank through the cooling liquid flowing in the first branch.
Further, the processor 420 may be further configured to:
acquiring the temperature of the cooling liquid in the return pipeline;
and controlling the working state of the electronic fan according to the temperature of the cooling liquid so that the temperature of the cooling liquid in the return pipeline is lower than the preset temperature.
Further, the processor 420 may be further configured to:
and under the condition that the temperature of the cooling liquid is higher than or equal to the preset temperature, controlling the electronic fan to be started, and regulating the rotating speed of the electronic fan according to the temperature of the cooling liquid so as to enable the temperature of the cooling liquid in the return pipeline to be lower than the preset temperature.
Further, the processor 420 may be further configured to:
and under the condition that the temperature of the cooling liquid is lower than the preset temperature, the electronic fan is controlled to be turned off so that the temperature of the cooling liquid in the return pipeline is lower than the preset temperature.
Through the technical scheme, the hydraulic oil temperature of the hydraulic oil in the hydraulic oil tank is obtained; and under the condition that the hydraulic oil temperature is lower than the first preset oil temperature, adjusting the flow of the cooling liquid in the first branch and the flow of the cooling liquid in the second branch by controlling the opening degree of the reversing valve so as to heat the hydraulic oil in the hydraulic oil tank through the cooling liquid flowing in the first branch. According to the hydraulic oil temperature control device, the flow of the cooling liquid passing through the hydraulic oil tank can be regulated through the electronic control proportional reversing valve according to the hydraulic oil temperature, the hydraulic oil is heated through the heat of the cooling liquid, the heating speed of the hydraulic oil in a low-temperature environment is improved, the time for waiting for warming up is shortened, the machine can quickly reach a normal working state, meanwhile, the working load of an electronic fan is reduced, and the energy consumption is reduced.
As shown in fig. 1, an embodiment of the present application provides a thermal management system of an electric excavator, which may include:
a controller according to the above;
the return pipeline 9 comprises a first branch 5 and a second branch 8, and the first branch 5 is communicated with the hydraulic oil tank 3;
an electric water pump 7 configured to drive a circulation flow of the cooling liquid in the return line 9;
the reversing valve 6 is disposed between the liquid inlet of the first branch 5 and the liquid inlet of the second branch 8, and is configured to adjust the flow rate of the cooling liquid in the first branch 5 and the flow rate of the cooling liquid in the second branch 8.
In an embodiment of the present application, the thermal management system may further include:
an electronic fan 12, connected to the return line 9 and the drive module, respectively, is configured to reduce the temperature of the cooling liquid in the return line.
In this embodiment of the application, the thermal management system includes electric water pump 7, return line 9, switching-over valve 6, radiator 11 and electronic fan 12, and wherein, return line 9 includes first branch road 5 and second branch road 8, and switching-over valve 6 sets up between the inlet of first branch road 5 and the inlet of second branch road 8, and hydraulic tank 3 sets up on first branch road 5, and electronic fan 12 is a part of radiator, and radiator 11 water inlet department is provided with coolant temperature sensor 10. In this embodiment of the application, electric water pump 7 drives the coolant liquid and circulates in the pipeline as the power supply that the coolant liquid flows, and reversing valve 6 that electric water pump 7's delivery port set up can control the flow of coolant liquid flow to first branch road 5 and second branch road 8, and the direct flow of second branch road 8 is dispelled the heat to the radiator, and first branch road 5 flows to hydraulic tank. The hydraulic oil temperature is acquired through the hydraulic oil temperature sensor 4 and then fed back to the controller, and the controller outputs an electric signal to control the reversing valve 4 to close or adjust the flow of the first branch 5 and the second branch 8. Preferably, the reversing valve 4 may be an electronically controlled proportional reversing valve. The coolant temperature sensor 10 is used for detecting the temperature of the coolant flowing into the radiator 11, and then feeding back the temperature to the controller, and the controller outputs an electrical signal according to the received temperature to control the electronic fan 12 to operate.
As shown in fig. 1, an embodiment of the present application further provides an electric excavator, which may include:
a thermal management system according to the above;
a hydraulic oil tank 3 communicated with a return line 9 of the thermal management system; and
the drive module is in communication with a return line 9 of the thermal management system.
Embodiments of the present application also provide a machine-readable storage medium having instructions stored thereon for causing a machine to perform the above-described method of thermal management of an electric shovel.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.
Claims (11)
1. The utility model provides a heat management method of electric excavator, its characterized in that is applied to electric excavator's controller, the controller with electric excavator's heat management system communication connection, heat management system includes electric water pump, return line and switching-over valve, the return line intercommunication electric excavator's hydraulic tank and drive module, the return line includes first branch road and second branch road, first branch road intercommunication hydraulic tank, the switching-over valve sets up between the inlet of first branch road and the inlet of second branch road, the switching-over valve is used for adjusting the flow of coolant liquid in the first branch road and the flow of coolant liquid in the second branch road, electric water pump is used for driving the coolant liquid circulation flow in the return line, the method includes:
acquiring the hydraulic oil temperature of hydraulic oil in a hydraulic oil tank;
and under the condition that the hydraulic oil temperature is lower than a first preset oil temperature, adjusting the flow of the cooling liquid in the first branch and the flow of the cooling liquid in the second branch by controlling the opening degree of the reversing valve so as to heat the hydraulic oil in the hydraulic oil tank through the cooling liquid flowing in the first branch.
2. The heat management method according to claim 1, wherein adjusting the flow rate of the coolant in the first branch and the flow rate of the coolant in the second branch to heat the hydraulic oil in the hydraulic oil tank by the coolant flowing in the first branch by controlling the opening degree of the reversing valve in the case where the hydraulic oil temperature is lower than a first preset oil temperature includes:
closing the second branch by controlling the opening degree of the reversing valve under the condition that the hydraulic oil temperature is lower than the first preset oil temperature;
closing the first branch by controlling the opening degree of the reversing valve under the condition that the hydraulic oil temperature is higher than a second preset oil temperature;
wherein the second preset oil temperature is greater than the first preset oil temperature.
3. The heat management method according to claim 2, wherein adjusting the flow rate of the coolant in the first branch and the flow rate of the coolant in the second branch to heat the hydraulic oil in the hydraulic oil tank by the coolant flowing in the first branch by controlling the opening degree of the reversing valve in the case where the hydraulic oil temperature is lower than a first preset oil temperature further includes:
and under the condition that the hydraulic oil temperature is higher than the first preset oil temperature and lower than the second preset oil temperature, adjusting the flow of the cooling liquid in the first branch and the flow of the cooling liquid in the second branch by controlling the opening degree of the reversing valve so as to heat the hydraulic oil in the hydraulic oil tank through the cooling liquid flowing in the first branch.
4. The thermal management method of claim 1, wherein the thermal management system of the electric excavator further comprises an electronic fan connected to the return line and the drive module, respectively, the thermal management method further comprising:
acquiring the temperature of the cooling liquid in the return pipeline;
and controlling the working state of the electronic fan according to the temperature of the cooling liquid so that the temperature of the cooling liquid in the return pipeline is lower than a preset temperature.
5. The method according to claim 4, wherein controlling the operating state of the electronic fan according to the temperature of the cooling fluid so that the temperature of the cooling fluid in the return line is lower than a preset temperature includes:
and under the condition that the temperature of the cooling liquid is higher than or equal to the preset temperature, controlling the electronic fan to be started, and regulating the rotating speed of the electronic fan according to the temperature of the cooling liquid so as to enable the temperature of the cooling liquid in the return pipeline to be lower than the preset temperature.
6. The method according to claim 4, wherein controlling the operating state of the electronic fan according to the temperature of the cooling fluid so that the temperature of the cooling fluid in the return line is lower than a preset temperature further comprises:
and under the condition that the temperature of the cooling liquid is lower than the preset temperature, controlling the electronic fan to be turned off so as to enable the temperature of the cooling liquid in the return pipeline to be lower than the preset temperature.
7. A controller, comprising:
a memory configured to store instructions; and
a processor configured to invoke the instructions from the memory and when executing the instructions enable the method of thermal management of an electric shovel according to any one of claims 1 to 6.
8. A thermal management system for an electric excavator, comprising:
the controller according to claim 7;
the return pipeline comprises a first branch and a second branch, and the first branch is communicated with the hydraulic oil tank;
an electric water pump configured to drive a cooling liquid to circulate in the return line;
the reversing valve is arranged between the liquid inlet of the first branch and the liquid inlet of the second branch and is configured to adjust the flow of the cooling liquid in the first branch and the flow of the cooling liquid in the second branch.
9. The thermal management system of claim 8, further comprising:
and the electronic fan is respectively connected with the return pipeline and the driving module and is configured to reduce the temperature of the cooling liquid in the return pipeline.
10. An electric excavator, comprising:
the thermal management system of any one of claims 8 or 9;
the hydraulic oil tank is communicated with a return pipeline of the thermal management system; and
and the driving module is communicated with a return pipeline of the thermal management system.
11. A machine-readable storage medium having instructions stored thereon for causing a machine to perform the method of thermal management of an electric shovel according to any one of claims 1 to 6.
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Cited By (1)
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