CN114646359A - Liquid cooling system flow monitoring method and device and electric automobile - Google Patents
Liquid cooling system flow monitoring method and device and electric automobile Download PDFInfo
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- CN114646359A CN114646359A CN202210127649.4A CN202210127649A CN114646359A CN 114646359 A CN114646359 A CN 114646359A CN 202210127649 A CN202210127649 A CN 202210127649A CN 114646359 A CN114646359 A CN 114646359A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
- G01K13/02—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow
- G01K13/026—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow of moving liquids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K3/00—Thermometers giving results other than momentary value of temperature
- G01K3/08—Thermometers giving results other than momentary value of temperature giving differences of values; giving differentiated values
- G01K3/14—Thermometers giving results other than momentary value of temperature giving differences of values; giving differentiated values in respect of space
Abstract
The invention discloses a method and a device for monitoring the flow of a liquid cooling system and an electric automobile; the method for monitoring the flow of the liquid cooling system comprises the following steps: acquiring real-time cooling inlet and outlet temperature difference of working equipment, wherein the working equipment is equipment carrying a liquid cooling system, the cooling inlet and outlet temperature difference is the temperature difference between a water outlet and a water inlet of a target cooling liquid pipeline, and the target cooling liquid pipeline is arranged in a heating area of the working equipment; acquiring real-time internal and external temperature difference of the working equipment, wherein the internal and external temperature difference is the temperature difference between a cavity of the working equipment and the environment where the working equipment is located; obtaining a flow monitoring value of the liquid cooling system based on the current total heat dissipation power, the cooling inlet and outlet temperature difference, the internal and external temperature difference and a preset flow calculation formula of the working equipment, wherein the flow calculation formula is obtained by derivation based on a conduction heat dissipation formula and a convection heat dissipation formula; and outputting the flow monitoring value. The flow monitoring system can enable flow monitoring to be more flexible, and the size and the cost of the cooling system are reduced.
Description
Technical Field
The application belongs to the technical field of liquid cooling systems, and particularly relates to a method and a device for monitoring the flow of a liquid cooling system and an electric automobile.
Background
At present, the flow monitoring function of traditional liquid cooling system is comprehensive inadequately, often need install extra flowmeter on the cooling line and monitor the flow in its pipeline when the equipment (for example electric automobile mobile unit) that uses liquid cooling system monitors the flow, set up like this though comparatively swiftly and directly, but the installation of flowmeter can receive the restriction of installation space and cost, lead to the liquid cooling system only can monitor the flow of total flow or a certain branch road, have great limitation.
Disclosure of Invention
The application aims to provide a liquid cooling system flow monitoring method and device and an electric automobile, so that flow monitoring is more flexible, and the size and cost of a cooling system are reduced.
A first aspect of an embodiment of the present application provides a method for monitoring a flow rate of a liquid cooling system, including: acquiring a real-time cooling inlet and outlet temperature difference of the working equipment; the working equipment is equipment carrying a liquid cooling system, the cooling inlet and outlet temperature difference is the temperature difference between a water outlet and a water inlet of a target cooling liquid pipeline, and the target cooling liquid pipeline is arranged in a heating area of the working equipment; acquiring real-time internal and external temperature difference of the working equipment; the internal and external temperature difference is the temperature difference between the cavity of the working equipment and the environment where the working equipment is located; obtaining a flow monitoring value of the liquid cooling system based on the current total heat dissipation power of the working equipment, the cooling inlet and outlet temperature difference, the internal and external temperature difference and a preset flow calculation formula; the flow calculation formula is derived based on a conduction heat dissipation formula and a convection heat dissipation formula; and outputting the flow monitoring value.
In one embodiment, the flow calculation formula is related to a heat transfer coefficient; the method further comprises the following steps before the flow monitoring value of the liquid cooling system is obtained: and acquiring the heat transfer coefficient.
In one embodiment, the obtaining the heat transfer coefficient includes: under the self-checking condition, respectively acquiring the cooling inlet and outlet temperature difference and the internal and external temperature difference of the working equipment in a first working state and the cooling inlet and outlet temperature difference and the internal and external temperature difference in a second working state; wherein the self-test condition comprises: the flow of the liquid cooling system is unchanged; and calculating the heat transfer coefficient based on the total heat dissipation power of the working equipment in the first working state, the total heat dissipation power of the working equipment in the second working state, the cooling inlet-outlet temperature difference and the internal-external temperature difference of the working equipment in the first working state and the second working state, and the flow calculation formula.
In one embodiment, the flow calculation formula is:
wherein Q is a flow monitoring value, PSSFor the total heat dissipation power of the working apparatus, KNIs the heat transfer coefficient of the working equipment, ANIs the heat dissipation area of the working equipment, T is the temperature of the cavity, TERho is the temperature of the environment in which the working equipment is located, rho is the density of the cooling liquid, c is the specific heat capacity of the cooling liquid, and T isINIs the water inlet temperature, T, of the target coolant lineOUTIs the water outlet temperature of the target cooling liquid pipeline.
In one embodiment, the working equipment comprises a cavity temperature detection sensor and an environment temperature detection sensor; the acquiring of the real-time internal and external temperature difference of the working equipment comprises the following steps: respectively acquiring the real-time temperature of the cavity and the real-time temperature of the environment where the working equipment is located through the cavity temperature detection sensor and the environment temperature detection sensor; and subtracting the real-time temperature of the environment where the working equipment is located from the real-time temperature of the cavity to obtain the real-time internal and external temperature difference of the working equipment.
In one embodiment, the working equipment comprises a water inlet temperature sensor and a water outlet temperature sensor; the obtaining of the real-time cooling inlet and outlet temperature difference of the working equipment comprises: respectively acquiring the water inlet temperature of the target cooling liquid pipeline and the water outlet temperature of the target cooling liquid pipeline through the water inlet temperature sensor and the water outlet temperature sensor; and subtracting the water inlet temperature of the target cooling liquid pipeline from the water outlet temperature of the target cooling liquid pipeline to obtain the real-time cooling inlet and outlet temperature difference of the working equipment.
A second aspect of the embodiments of the present application provides a flow monitoring device for a liquid cooling system, including: the first acquisition unit is used for acquiring the real-time cooling inlet and outlet temperature difference of the working equipment; the working equipment is equipment carrying a liquid cooling system, the cooling inlet and outlet temperature difference is the temperature difference between a water outlet and a water inlet of a target cooling liquid pipeline, and the target cooling liquid pipeline is arranged in a heating area of the working equipment; the second acquisition unit is used for acquiring the real-time internal and external temperature difference of the working equipment; the internal and external temperature difference is the temperature difference between the cavity of the working equipment and the environment where the working equipment is located; the calculation unit is used for obtaining a flow monitoring value of the liquid cooling system based on the current total heat dissipation power of the working equipment, the cooling inlet and outlet temperature difference, the inner and outer temperature difference and a preset flow calculation formula; the flow calculation formula is derived based on a conduction heat dissipation formula and a convection heat dissipation formula; and the output unit is used for outputting the flow monitoring value.
In one embodiment, the flow calculation formula is related to a heat transfer coefficient; the liquid cooling system flow monitoring device further comprises: a third acquiring unit for acquiring the heat transfer coefficient.
A third aspect of the embodiments of the present application provides a liquid cooling system flow monitoring apparatus, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program to implement the steps of the liquid cooling system flow monitoring method described above.
A fourth aspect of the embodiments of the present application provides an electric vehicle, including a vehicle controller, a liquid cooling system, a plurality of liquid cooling system flow monitoring devices as described above, and a plurality of working devices; the liquid cooling system is used for cooling each working device; each liquid cooling system flow monitoring device corresponds to one working device and is used for calculating the flow monitoring value of the corresponding working device; and each liquid cooling system flow monitoring device is connected with the vehicle control unit so as to transmit the calculated flow monitoring value to the vehicle control unit.
Therefore, compared with the prior art, the embodiment of the application has the following beneficial effects: the flow monitoring value can be calculated only through temperature data and predicted parameters acquired by a temperature sensor arranged on the device without installing a flowmeter with a large volume, so that the flow monitoring is more flexible, and the volume and the cost of a cooling system are reduced.
Drawings
Fig. 1 is a flowchart of a flow monitoring method for a liquid cooling system according to a first embodiment of the present disclosure;
fig. 2 is a flowchart of a flow monitoring method for a liquid cooling system according to a second embodiment of the present application;
fig. 3 is a schematic view of a flow monitoring device of a liquid cooling system according to a third embodiment of the present application;
fig. 4 is a schematic view of a flow monitoring device of a liquid cooling system according to a fourth embodiment of the present application;
fig. 5 is a schematic circuit diagram of an electric vehicle according to a fifth embodiment of the present application.
As in the previous figures: 100. a liquid cooling system flow monitoring device; 111. a first acquisition unit; 112. a second acquisition unit; 113. a calculation unit; 114. an output unit; 121. a processor; 122. a memory; 123. a computer program; 200. a cavity temperature detection sensor; 300. an ambient temperature detection sensor; 400. a water inlet temperature sensor; 500. a water outlet temperature sensor; 600. and (5) a vehicle control unit.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Fig. 1 shows a flowchart of a flow monitoring method for a liquid cooling system according to a first embodiment of the present invention, where the flow monitoring method includes:
and S11, acquiring the real-time cooling inlet and outlet temperature difference of the working equipment.
The working equipment is equipment carrying a liquid cooling system, the cooling inlet-outlet temperature difference is the temperature difference between a water outlet and a water inlet of a target cooling liquid pipeline, and the target cooling liquid pipeline is arranged in a heating area of the working equipment.
Optionally, the working device may include a water inlet temperature sensor 400 and a water outlet temperature sensor 500; in step S11 of this embodiment, the water inlet temperature of the target cooling liquid pipeline and the water outlet temperature of the target cooling liquid pipeline may be respectively collected by the water inlet temperature sensor 400 and the water outlet temperature sensor 500; and subtracting the water inlet temperature of the target cooling liquid pipeline from the water outlet temperature of the target cooling liquid pipeline to obtain the cooling inlet and outlet temperature difference.
In an alternative embodiment, the water inlet temperature is the coolant temperature at the water inlet and the water outlet temperature is the coolant temperature at the water outlet.
In another alternative embodiment, the water inlet temperature is the water inlet pipe wall temperature and the water outlet temperature is the water outlet pipe wall temperature.
And S12, acquiring the real-time internal and external temperature difference of the working equipment.
The temperature difference between the inside and the outside is the temperature difference between the cavity of the working equipment and the environment where the working equipment is located.
Optionally, the working device includes a cavity temperature detection sensor 200 and an ambient temperature detection sensor 300. In step S12 of this embodiment, the real-time temperature of the cavity and the real-time temperature of the environment where the working device is located may be respectively collected by the cavity temperature detection sensor 200 and the environment temperature detection sensor 300; and subtracting the real-time temperature of the environment where the working equipment is located from the real-time temperature of the cavity to obtain the real-time internal and external temperature difference of the working equipment.
And S13, obtaining a flow monitoring value of the liquid cooling system based on the current total heat dissipation power, the cooling inlet and outlet temperature difference, the internal and external temperature difference and a preset flow calculation formula of the working equipment.
The flow calculation formula is derived based on a conduction heat dissipation formula and a convection heat dissipation formula. In an embodiment, the flow calculation formula may be derived based on the following manner:
based on the law of conservation of energy, a first formula can be obtained: pSS＝φN+φC+φQ(ii) a In the first formula, PSSFor the total heat dissipation power of the working equipment, phiQFor accumulated heat remaining in the chamber of the working apparatus, phiNHeat conducted through the air for the working equipment, phiCThe heat convection conducted out for the working equipment through the liquid cooling system. The total dissipated power may be given by the second formula: pSS＝∑PLOSSIs calculated to obtain, wherein, PLOSSThe heat dissipated for each heat generating element in the operating device. In actual calculation, the accumulated heat is far smaller than the conduction heat and the convection heat, so the first formula can be simplified into a third formula: pSS＝φN+φC。
In this embodiment, the formula of conduction heat dissipation is: phi is aN＝KN×AN×(T-TE) (ii) a In the above formula, KNIs the heat transfer coefficient of the working equipment, ANIs the heat dissipation area of the working equipment, T is the temperature of the cavity, TEIs the temperature of the environment in which the working equipment is located. Wherein the heat dissipation area of the working equipment is a predictable constant value and the cavityThe temperature of the body and the temperature of the environment are sampling values which can be monitored by corresponding temperature sensors, so that the calculation of the heat transfer quantity can be completed as long as the value of the heat transfer coefficient is obtained.
In this embodiment, the convection heat dissipation formula is: phi is aC＝ρ×c×Q×(TOUT-TIN) (ii) a In the above formula, ρ is the density of the coolant, c is the specific heat capacity of the coolant, Q is the flow rate monitor value, and TINIs the water inlet temperature, T, of the target coolant lineOUTIs the water outlet temperature of the target coolant pipeline. Wherein, coolant liquid density, coolant liquid specific heat capacity are predictable definite values under the known condition of the composition of coolant liquid, and water inlet temperature and delivery port temperature are the sampling value of accessible corresponding temperature sensor monitoring.
A fourth equation can be obtained according to the third equation, the conduction heat dissipation equation and the convection heat dissipation equation:
the fourth formula is a flow calculation formula, wherein the unknown quantity is only a flow monitoring value and a heat transfer coefficient, and the calculation of the flow monitoring value can be realized after the heat transfer coefficient is obtained through self-checking or the heat transfer coefficient is obtained through a test performed in advance.
And S14, outputting a flow monitoring value.
In step S14, the flow monitoring value may be displayed through a display screen, or the flow monitoring value may also be output to a data acquisition device, so as to implement real-time monitoring of the flow.
Fig. 2 shows a flowchart of a method for monitoring a flow rate of a liquid cooling system according to a second embodiment of the present invention, where the method for monitoring a flow rate of a liquid cooling system includes:
and S21, under the self-checking condition, respectively acquiring the cooling inlet and outlet temperature difference and the internal and external temperature difference of the working equipment in the first working state and the cooling inlet and outlet temperature difference and the internal and external temperature difference in the second working state.
In step S21 of the present embodiment, the self-test conditions include: the flow of the liquid cooling system is unchanged.
In this embodiment, the working device is a device having a liquid cooling system mounted thereon. The cooling inlet and outlet temperature difference is the temperature difference between the water outlet and the water inlet of the target cooling liquid pipeline. The target cooling liquid pipeline is arranged in a heat generation area of the working equipment. The internal and external temperature difference is the temperature difference between the cavity of the working equipment and the environment where the working equipment is located.
Optionally, the first operating state is: and working at a first preset power for a first self-checking time. The second working state is as follows: and operating at a second preset power for a second self-checking time. Wherein the second predetermined power is different from the first predetermined power.
In an optional embodiment, the first preset power is 30% of the rated working power of the working equipment, and the first self-checking time is 1 second to 10 seconds; the second preset power is 70% of rated working power of the working equipment, and the second self-checking time is 1-10 seconds.
And S22, calculating the heat transfer coefficient based on the total heat dissipation power of the working equipment in the first working state, the total heat dissipation power of the working equipment in the second working state, the cooling inlet and outlet temperature difference and the internal and external temperature difference of the working equipment in the first working state and the second working state, and a flow calculation formula.
The total heat dissipation power of the working equipment in different working states is different, the internal and external temperature difference is different, and the cooling inlet and outlet temperature difference is different, so that the heat transfer coefficient calculated by two groups of different data obtained in different working states can better accord with the actual working environment of the working equipment under the self-checking condition. Compared with the heat transfer coefficient obtained through a test performed in advance, the heat transfer coefficient obtained through self-checking can avoid the influence of individual differences of working equipment, so that the value of the heat transfer coefficient is closer to an actual value.
It should be noted that, in step S22 of this embodiment, a fifth formula can be obtained by respectively replacing the two sets of data acquired in the first operating state and the second operating state with the flow calculation formula:
and a sixth formula:
wherein Q (1) and Q (2) are flow monitoring values in a first working state and a second working state respectively, PSS(1) And PSS(2) Total heat dissipation power, P, in the first and second operating states, respectivelySS(1) And PSS(2) All can be obtained by calculating the working parameters of the working equipment, ANRho and c are known constant values, T (1), TE(1)、TIN(1) And TOUT(1) Respectively the temperature of the cavity, the temperature of the environment, the temperature of the water inlet and the temperature of the water outlet in the first state, T (2), TE(2)、TIN(2) And TOUT(2) Respectively the temperature of the cavity, the ambient temperature, the water inlet temperature and the water outlet temperature in the second state, T (1) and TE(1)、TIN(1)、TOUT(1)、T(2)、TE(2)、TIN(2) And TOUT(2) Are sampling values, and Q (1) and Q (2) are equal under the self-checking condition in a short time, so Q (1) and Q (2) can be eliminated by a fifth formula and a sixth formula to obtain a seventh formula:
the heat transfer coefficient can be obtained by the seventh formula calculation, and the heat transfer coefficient can be used for the subsequent calculation of the flow monitoring value.
It should be noted that the heat transfer coefficient is theoretically a variable, and the value of the heat transfer coefficient changes with the temperature of the cavity and the temperature of the environment, but the heat transfer coefficient is considered to be a constant in the actual calculation process because the proportion of the conducted heat in the total heat dissipation power is small, and the heat transfer coefficient is less affected by the temperature of the cavity and the temperature of the environment under the normal working condition.
And S23, acquiring the real-time cooling inlet and outlet temperature difference of the working equipment.
The working equipment is equipment carrying a liquid cooling system, the cooling inlet-outlet temperature difference is the temperature difference between a water outlet and a water inlet of a target cooling liquid pipeline, and the target cooling liquid pipeline is arranged in a heating area of the working equipment.
And S24, acquiring the real-time internal and external temperature difference of the working equipment.
Wherein, the internal and external temperature difference is the temperature difference between the cavity of the working equipment and the environment where the working equipment is located.
And S25, obtaining a flow monitoring value of the liquid cooling system based on the current total heat dissipation power, the cooling inlet and outlet temperature difference, the internal and external temperature difference and a preset flow calculation formula of the working equipment. The flow calculation formula is derived based on a conduction heat dissipation formula and a convection heat dissipation formula.
And S26, outputting a flow monitoring value.
Steps S23, S24, S25, and S26 respectively correspond to steps S11, S12, S13, and S14 in the first embodiment, and are not described herein again.
Fig. 3 shows a schematic diagram of a flow monitoring device of a liquid cooling system according to a third embodiment of the present invention, which is detailed as follows:
a liquid cooling system flow monitoring apparatus 100, comprising: a first acquisition unit 111, a second acquisition unit 112, a calculation unit 113, and an output unit 114.
In this embodiment, the first obtaining unit 111 is configured to obtain a real-time cooling inlet and outlet temperature difference of the working device, the working device is a device carrying a liquid cooling system, the cooling inlet and outlet temperature difference is a temperature difference between a water outlet and a water inlet of the target cooling liquid pipeline, and the target cooling liquid pipeline is disposed in a heating area of the working device.
The second obtaining unit 112 is configured to obtain a real-time internal and external temperature difference of the working device, where the internal and external temperature difference is a temperature difference between a cavity of the working device and an environment where the working device is located.
The calculating unit 113 is configured to obtain a flow monitoring value of the liquid cooling system based on a current total heat dissipation power, a cooling inlet/outlet temperature difference, an internal/external temperature difference, and a preset flow calculation formula of the working device. The flow calculation formula is derived based on a conduction heat dissipation formula and a convection heat dissipation formula.
The output unit 114 is used for outputting the flow monitoring value.
In another embodiment, the flow calculation formula is related to a heat transfer coefficient, and the liquid cooling system flow monitoring apparatus 100 further includes a third obtaining unit, where the third obtaining unit is configured to obtain the heat transfer coefficient, and the heat transfer coefficient is used for the calculating unit 113 to calculate the flow monitoring value, so as to improve the accuracy of the result.
Fig. 4 shows a schematic diagram of a flow monitoring device of a liquid cooling system according to a fourth embodiment of the present invention, which is detailed as follows:
a liquid cooling system flow monitoring device 100 comprises a memory 122, a processor 121 and a computer program 123 stored in the memory 122 and capable of running on the processor 121, wherein the liquid cooling system flow monitoring device 100 is respectively connected with a cavity temperature detection sensor 200, an environment temperature detection sensor 300, a water inlet temperature sensor 400 and a water outlet temperature sensor 500 for receiving the temperature collected by each temperature sensor, and the steps of the liquid cooling system flow monitoring method according to the first embodiment or the second embodiment are realized when the processor 121 executes the computer program 123. The processor 121 may be a single chip Microcomputer (MCU) or a Field Programmable Gate Array (FPGA), and the memory 122 may be an internal storage Unit of the liquid cooling system flow monitoring device 100, such as a hard disk or a memory of the liquid cooling system flow monitoring device 100. The memory 122 may also be an external storage device of the liquid cooling system flow monitoring apparatus 100, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), or the like, provided on the liquid cooling system flow monitoring apparatus 100. Further, the memory 122 may also include both an internal memory unit and an external memory device of the liquid cooling system flow monitoring apparatus 100. The memory 122 is used for storing computer programs 123 and other programs and data required by the terminal device. The memory 122 may also be used to temporarily store data that has been output or is to be output.
Fig. 5 shows a schematic circuit diagram of an electric vehicle according to a fifth embodiment of the present invention, which is detailed as follows:
an electric Vehicle comprises a Vehicle Control Unit (VCU) 600, a liquid cooling system, a plurality of liquid cooling system flow monitoring devices 100 and a plurality of working devices, wherein the liquid cooling system is used for cooling each working device; each working device shares one ambient temperature detection sensor 300; each liquid cooling system flow monitoring device 100 corresponds to one working device and is used for calculating a flow monitoring value of the corresponding working device, and each working device comprises a cavity temperature detection sensor 200, a water inlet temperature sensor 400 and a water outlet temperature sensor 500; each liquid cooling system flow monitoring device 100 is connected with the vehicle control unit 600 to transmit the calculated flow monitoring value to the vehicle control unit 600, so as to realize real-time monitoring of the flow monitoring value.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A method for monitoring the flow of a liquid cooling system is characterized by comprising the following steps:
acquiring a real-time cooling inlet and outlet temperature difference of the working equipment; the working equipment is equipment carrying a liquid cooling system, the temperature difference of the cooling inlet and the cooling outlet is the temperature difference between a water outlet and a water inlet of a target cooling liquid pipeline, and the target cooling liquid pipeline is arranged in a heating area of the working equipment;
acquiring real-time internal and external temperature difference of the working equipment; the internal and external temperature difference is the temperature difference between the cavity of the working equipment and the environment where the working equipment is located;
obtaining a flow monitoring value of the liquid cooling system based on the current total heat dissipation power of the working equipment, the cooling inlet and outlet temperature difference, the internal and external temperature difference and a preset flow calculation formula; the flow calculation formula is derived based on a conduction heat dissipation formula and a convection heat dissipation formula;
and outputting the flow monitoring value.
2. The liquid cooling system flow monitoring method of claim 1, wherein the flow calculation formula is related to a heat transfer coefficient;
the method further comprises the following steps before the flow monitoring value of the liquid cooling system is obtained: and acquiring the heat transfer coefficient.
3. The liquid cooling system flow monitoring method of claim 2, wherein said obtaining said heat transfer coefficient comprises:
under the self-checking condition, respectively acquiring the cooling inlet and outlet temperature difference and the internal and external temperature difference of the working equipment in a first working state and the cooling inlet and outlet temperature difference and the internal and external temperature difference in a second working state; wherein the self-test condition comprises: the flow of the liquid cooling system is unchanged;
and calculating the heat transfer coefficient based on the total heat dissipation power of the working equipment in the first working state, the total heat dissipation power of the working equipment in the second working state, the cooling inlet-outlet temperature difference and the internal-external temperature difference of the working equipment in the first working state and the second working state, and the flow calculation formula.
4. The method for monitoring the flow rate of a liquid cooling system according to claim 3, wherein the flow rate calculation formula is:
wherein Q is a flow monitoring value, PSSFor the total heat dissipation power of the working apparatus, KNIs the heat transfer coefficient of the working equipment, ANFor heat dissipation of the working equipmentArea, T is the temperature of the cavity, TERho is the temperature of the environment in which the working equipment is located, rho is the density of the cooling liquid, c is the specific heat capacity of the cooling liquid, and T isINIs the water inlet temperature, T, of the target coolant lineOUTIs the water outlet temperature of the target cooling liquid pipeline.
5. The method for monitoring the flow rate of a liquid cooling system according to any one of claims 1 to 4, wherein the working equipment comprises a cavity temperature detection sensor and an ambient temperature detection sensor;
the obtaining of the real-time internal and external temperature difference of the working equipment comprises:
respectively acquiring the real-time temperature of the cavity and the real-time temperature of the environment where the working equipment is located through the cavity temperature detection sensor and the environment temperature detection sensor;
and subtracting the real-time temperature of the environment where the working equipment is located from the real-time temperature of the cavity to obtain the real-time internal and external temperature difference of the working equipment.
6. The liquid cooling system flow monitoring method of any of claims 1 to 4, wherein the working equipment comprises a water inlet temperature sensor and a water outlet temperature sensor;
the obtaining of the real-time cooling inlet and outlet temperature difference of the working equipment comprises:
respectively acquiring the water inlet temperature of the target cooling liquid pipeline and the water outlet temperature of the target cooling liquid pipeline through the water inlet temperature sensor and the water outlet temperature sensor;
and subtracting the water inlet temperature of the target cooling liquid pipeline from the water outlet temperature of the target cooling liquid pipeline to obtain the real-time cooling inlet and outlet temperature difference of the working equipment.
7. A flow monitoring device of a liquid cooling system is characterized by comprising:
the first acquisition unit is used for acquiring the real-time cooling inlet and outlet temperature difference of the working equipment; the working equipment is equipment carrying a liquid cooling system, the cooling inlet and outlet temperature difference is the temperature difference between a water outlet and a water inlet of a target cooling liquid pipeline, and the target cooling liquid pipeline is arranged in a heating area of the working equipment;
the second acquisition unit is used for acquiring the real-time internal and external temperature difference of the working equipment; the internal and external temperature difference is the temperature difference between the cavity of the working equipment and the environment where the working equipment is located;
the calculation unit is used for obtaining a flow monitoring value of the liquid cooling system based on the current total heat dissipation power of the working equipment, the cooling inlet and outlet temperature difference, the inner and outer temperature difference and a preset flow calculation formula; the flow calculation formula is derived based on a conduction heat dissipation formula and a convection heat dissipation formula;
and the output unit is used for outputting the flow monitoring value.
8. The liquid cooling system flow monitoring device of claim 7, wherein the flow calculation formula is related to a heat transfer coefficient;
the liquid cooling system flow monitoring device further comprises:
a third acquiring unit for acquiring the heat transfer coefficient.
9. A liquid cooling system flow monitoring device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the liquid cooling system flow monitoring method according to any one of claims 1 to 6.
10. An electric vehicle, characterized by comprising a vehicle control unit, a liquid cooling system, a plurality of liquid cooling system flow monitoring devices according to any one of claims 7 to 9, and a plurality of working devices; the liquid cooling system is used for cooling each working device; each liquid cooling system flow monitoring device corresponds to one working device and is used for calculating the flow monitoring value of the corresponding working device; and each liquid cooling system flow monitoring device is connected with the vehicle control unit so as to transmit the calculated flow monitoring value to the vehicle control unit.
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| CN202210127649.4A CN114646359A (en) | 2022-02-11 | 2022-02-11 | Liquid cooling system flow monitoring method and device and electric automobile |
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| CN202210127649.4A CN114646359A (en) | 2022-02-11 | 2022-02-11 | Liquid cooling system flow monitoring method and device and electric automobile |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115839282A (en) * | 2023-02-17 | 2023-03-24 | 西安陕柴重工核应急装备有限公司 | Fuel system construction method and device based on generator set |
| WO2024036652A1 (en) * | 2022-08-16 | 2024-02-22 | 北京华卓精科科技股份有限公司 | Apparatus for measuring heat dissipation of liquid-cooling device |
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2022
- 2022-02-11 CN CN202210127649.4A patent/CN114646359A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024036652A1 (en) * | 2022-08-16 | 2024-02-22 | 北京华卓精科科技股份有限公司 | Apparatus for measuring heat dissipation of liquid-cooling device |
| CN115839282A (en) * | 2023-02-17 | 2023-03-24 | 西安陕柴重工核应急装备有限公司 | Fuel system construction method and device based on generator set |
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