CN116546799A

CN116546799A - Charging pile heat treatment method and system based on real-time infrared image data

Info

Publication number: CN116546799A
Application number: CN202310808112.9A
Authority: CN
Inventors: 王巍; 邢尧; 王岁; 陈杰鸿; 马楠
Original assignee: Tianjin Guangruida Automotive Electronics Co ltd
Current assignee: Tianjin Guangruida Automotive Electronics Co ltd
Priority date: 2023-07-04
Filing date: 2023-07-04
Publication date: 2023-08-04
Anticipated expiration: 2043-07-04
Also published as: CN116546799B

Abstract

The embodiment of the invention provides a charging pile heat treatment method and a charging pile heat treatment system based on real-time infrared image data. According to the embodiment of the invention, the real-time infrared image data of each charging pile in the charging pile group is obtained, the actual temperature of each charging pile is determined, the estimated temperature of each charging pile is determined according to the estimated heating value of each charging pile, the heat transfer loss of liquid in each pipeline when the charging pile is cooled is determined according to the infrared image data of each pipeline in the heat radiation equipment, and then the refrigerating equipment and the corresponding device are controlled to operate according to the requirements by globally obtaining the data condition of each position of the heat treatment system, so that each charging pile can be cooled in time, the potential safety hazard is reduced, and meanwhile, the energy efficiency of the heat treatment system is effectively improved.

Description

Charging pile heat treatment method and system based on real-time infrared image data

Technical Field

The invention relates to the technical field of heat treatment of charging piles, in particular to a method and a system for heat treatment of charging piles based on real-time infrared image data.

Background

The charging pile is a charging device for providing energy for electric vehicles, has a function similar to that of an oiling machine in a gas station, can be fixed on the ground or on a wall, is installed in a parking lot or a charging station of a public building and a residential community, and can charge various types of electric vehicles according to different voltage levels.

With the rapid development of technology, the power battery of the new energy automobile starts to have higher voltage and/or higher current, and the matched charging pile also starts to use higher voltage and/or higher current, so that the charging efficiency can be greatly improved, but the charging pile also generates more heat.

With the continuous development of the scale of new energy vehicles, the situation that the charging pile always works continuously exists, the heat generated during charging of the charging pile has great potential safety hazards, and how to timely and effectively remove the heat emitted by the charging pile is a challenge which cannot be avoided.

Disclosure of Invention

At least one embodiment of the invention provides a charging pile heat treatment method and a charging pile heat treatment system based on real-time infrared image data, so as to solve the problem that heat generated during charging of a charging pile in the prior art cannot be timely treated.

In a first aspect, an embodiment of the present invention provides a heat treatment method for a charging pile based on real-time infrared image data, where the heat treatment method includes:

acquiring first infrared image data of each charging pile in a charging pile group in real time, and identifying the first infrared image data to obtain the current temperature of each charging pile;

Acquiring real-time estimated heating values of all charging piles in a charging pile group, and determining estimated temperatures of all the charging piles based on the real-time estimated heating values of all the charging piles and the current temperature;

determining a first heat transfer loss of the cooling liquid in a first transmission pipeline at different flow rates and different temperatures according to second infrared image data of the first transmission pipeline between the heat exchanger and the charging pile; determining a second heat transfer loss of the refrigerant in a second transfer line between the refrigeration equipment and the heat exchanger at different flow rates and different temperatures from third infrared image data of the second transfer line;

determining optimal cooling liquid flow of cooling liquid in each first transmission pipeline for cooling each charging pile, and optimal refrigerant flow and heat dissipation power output by the refrigeration equipment according to the first heat transfer loss, the second heat transfer loss and the estimated temperature of each charging pile;

and controlling the cooling liquid in each first transmission pipeline for cooling each charging pile to flow at the optimal cooling liquid flow rate, controlling the refrigerant in the refrigeration equipment to flow at the optimal refrigerant flow rate and controlling the refrigeration equipment to operate at the heat dissipation power.

Based on the above technical solution, the following improvements can be made in the embodiments of the present invention.

With reference to the first aspect, in a first embodiment of the first aspect, the determining, according to the first heat transfer loss, the second heat transfer loss, and the estimated temperature of each charging pile, an optimal cooling liquid flow of the cooling liquid in each first transmission pipeline for cooling each charging pile, and an optimal refrigerant flow and heat dissipation power output by the refrigeration device includes:

determining the optimal cooling liquid temperature output by the heat exchanger and the optimal cooling liquid flow of the cooling liquid in the first transmission pipelines for cooling the charging piles when the charging piles are reduced from the corresponding estimated temperature to the safe temperature according to the first heat transfer loss;

calculating a first temperature to be cooled of the cooling liquid returned to the heat exchanger according to the safe temperature and the first heat transfer loss;

determining an optimal refrigerant temperature and an optimal refrigerant flow output by the refrigeration equipment when the first temperature to be cooled is reduced to the optimal cooling liquid temperature according to the second heat transfer loss;

Calculating to obtain a second temperature to be cooled of the refrigerant returned to the refrigeration equipment according to the optimal cooling liquid temperature and the second heat transfer loss;

and determining the heat radiation power of the refrigeration equipment according to the second temperature to be cooled and the optimal refrigerant temperature.

With reference to the first aspect, in a second embodiment of the first aspect, the obtaining the real-time estimated heating value of each charging pile in the charging pile group includes:

acquiring real-time operation power and estimated operation time length of each charging pile;

and calculating the real-time estimated heating value according to the real-time operation power and the estimated operation time length.

With reference to the first embodiment of the first aspect, in a third embodiment of the first aspect, the determining, according to the second infrared image data of the first transmission pipeline between the heat exchanger and the charging pile, a first heat transfer loss of the cooling liquid in the first transmission pipeline at different flow rates and different temperatures includes:

identifying the second infrared image data to obtain the temperature difference between the cooling liquid in the first transmission pipeline and the room temperature;

according to the length and the heat conduction coefficient of a first transmission pipeline between the cooling liquid output by the heat exchanger and the charging pile and the temperature difference between the cooling liquid in the first transmission pipeline and the room temperature, calculating to obtain the heat loss of the first cooling liquid under different flow rates;

According to the length and the heat conduction coefficient of a first transmission pipeline between the charging pile and the heat exchanger and the temperature difference between the cooling liquid in the first transmission pipeline and the room temperature, calculating to obtain the heat loss of a second cooling liquid under different flow rates;

and calculating the first heat transfer loss according to the first cooling liquid heat loss and the second cooling liquid heat loss.

With reference to the third embodiment of the first aspect, in a fourth embodiment of the first aspect, the heat loss coefficient is calculated by the following formula:

wherein J1 is the heat loss coefficient, T1 is the temperature difference between the cooling liquid and the room temperature,b is a preset constant which is greater than or equal to 1, k1 is a heat conduction coefficient of heat conduction of the first transmission pipeline to air, v1 is a flow rate of the cooling liquid in the first transmission pipeline, s1 is a cross-sectional area of the first transmission pipeline, q1 is a preset constant, L1 is a length of the first transmission pipeline, and a is an adjustment constant;

and calculating the heat loss of the first cooling liquid or the heat loss of the second cooling liquid according to the current temperature of the cooling liquid in the first transmission pipeline and the heat loss coefficient.

With reference to the third embodiment of the first aspect, in a fifth embodiment of the first aspect, the determining an optimal cooling liquid temperature output by the heat exchanger when each charging pile is reduced from a corresponding estimated temperature to a safe temperature includes:

determining the total heat transfer amount of each charging pile to the first transmission pipeline when each charging pile is respectively reduced from the corresponding estimated temperature to the safe temperature;

and calculating to obtain the optimal cooling liquid temperature output by the heat exchanger according to the safe temperature, the total heat transfer amount of the charging pile to the first transmission pipeline and the heat loss of the first cooling liquid.

With reference to the third embodiment of the first aspect, in a sixth embodiment of the first aspect, the calculating, according to the safe temperature and the first heat transfer loss, a first temperature to be cooled of the cooling liquid returned to the heat exchanger includes:

and calculating the first temperature to be cooled according to the safe temperature and the heat loss of the second cooling liquid.

With reference to the third embodiment of the first aspect, in a seventh embodiment of the first aspect, the determining, when the cooling of each charging pile from the corresponding estimated temperature to the safe temperature, an optimal cooling liquid flow rate of the cooling liquid in each first transmission pipeline for cooling each charging pile includes:

Determining the heat transfer amount of each charging pile to a first transmission pipeline when each charging pile is respectively reduced from the corresponding estimated temperature to a safe temperature;

according to the optimal cooling liquid temperature and the heat loss of the first cooling liquid, calculating to obtain the cooling liquid temperature input into each charging pile for cooling;

and respectively calculating the flow of the cooling liquid in the first transmission pipelines for cooling the charging piles according to the safety temperature, the cooling liquid temperature and the heat transfer quantity of the charging piles to the first transmission pipelines, and taking the flow of the cooling liquid in the first transmission pipelines for cooling the charging piles as the optimal cooling liquid flow.

With reference to the first embodiment of the first aspect, in an eighth embodiment of the first aspect, determining a second heat transfer loss of the refrigerant in the second transfer line at different flow rates and different temperatures according to the third infrared image data of the second transfer line between the refrigeration device and the heat exchanger includes:

identifying the third infrared image data to obtain a temperature difference between the refrigerant in the second transmission pipeline and the room temperature;

according to the length and the heat conduction coefficient of a second transmission pipeline between the output refrigerant of the heat exchanger and the refrigeration equipment and the temperature difference between the refrigerant in the second transmission pipeline and the room temperature, calculating to obtain the heat loss of the first refrigerant under different flow rates;

According to the length and the heat conduction coefficient of a second transmission pipeline between the output refrigerant of the refrigeration equipment and the heat exchanger and the temperature difference between the refrigerant in the second transmission pipeline and the room temperature, calculating to obtain the heat loss of the second refrigerant under different flow rates;

and calculating the second heat transfer loss according to the first refrigerant heat loss and the second refrigerant heat loss.

With reference to the eighth embodiment of the first aspect, in a ninth embodiment of the first aspect, the heat loss coefficient is calculated by the following formula:

wherein J2 is the heat loss coefficient, T2 is the temperature difference between the refrigerant and the room temperature,b is a preset constant which is greater than or equal to 1, k2 is a heat conduction coefficient of heat conduction of the second transmission pipeline to air, v2 is a flow velocity of the refrigerant in the second transmission pipeline, s2 is a cross-sectional area of the second transmission pipeline, q2 is a preset constant, L2 is a length of the second transmission pipeline, and a is an adjustment constant;

and calculating the heat loss of the first refrigerant or the heat loss of the second refrigerant according to the current temperature of the refrigerant in the second transmission pipeline and the heat loss coefficient.

With reference to the eighth embodiment of the first aspect, in a tenth embodiment of the first aspect, the determining an optimal refrigerant temperature output by the refrigeration device when the first temperature to be cooled is reduced to the optimal cooling liquid temperature includes:

determining a total amount of heat transfer by the coolant to the refrigerant when the coolant in the heat exchanger is reduced from the first temperature to be cooled to the optimal coolant temperature;

and calculating to obtain the optimal refrigerant temperature output by the refrigeration equipment according to the optimal refrigerant temperature, the total heat transfer amount of the refrigerant transferred by the refrigerant and the heat loss of the first refrigerant.

With reference to the eighth embodiment of the first aspect, in an eleventh embodiment of the first aspect, the calculating, according to the optimal cooling liquid temperature and the second heat transfer loss, a second temperature to be cooled of the refrigerant returned to the refrigeration device includes:

and calculating the second temperature to be cooled of the refrigerant returned to the refrigeration equipment according to the optimal cooling liquid temperature and the second refrigerant heat loss.

With reference to the first embodiment of the first aspect, in a twelfth embodiment of the first aspect, the determining the heat dissipation power of the refrigeration device according to the second temperature to be cooled and the optimal refrigerant temperature includes:

And calculating the heat quantity required to be transferred for cooling the refrigerant according to the second temperature to be cooled and the optimal refrigerant temperature, and calculating the heat dissipation power of the refrigeration equipment.

With reference to the eighth embodiment of the first aspect, in a thirteenth embodiment of the first aspect, the determining that the refrigeration device outputs an optimal refrigerant flow when the first temperature to be cooled is reduced to the optimal cooling liquid temperature includes:

calculating a refrigerant temperature of the refrigerant input to the heat exchanger based on the optimal refrigerant temperature and the first refrigerant heat loss;

and calculating the flow of the refrigerant in the second transmission pipeline in the heat exchanger according to the optimal cooling liquid temperature, the refrigerant temperature and the total heat transfer amount of the cooling liquid transferred to the refrigerant, and taking the flow as the optimal refrigerant flow.

In a second aspect, an embodiment of the present invention provides a heat treatment system for a charging pile based on real-time infrared image data, the heat treatment system comprising: the controller is connected with each charging pile in the charging pile group;

The infrared camera device is connected with the controller and is used for acquiring first infrared image data of each charging pile in the charging pile group, second infrared image data of a first transmission pipeline between the heat exchanger and the charging pile and third infrared image data of a second transmission pipeline between the refrigerating equipment and the heat exchanger in real time;

a heat exchanger which is respectively communicated with an inlet and an outlet of the first transmission pipeline and the second transmission pipeline and is used for heat exchanging between the cooling liquid in the first transmission pipeline and the refrigerant in the second transmission pipeline;

an electronic water pump is arranged on the first transmission pipeline and used for adjusting the flow rate of the cooling liquid in the first transmission pipeline;

the first transmission pipeline is provided with a plurality of branch pipes, and each branch pipe is respectively matched with a corresponding charging pile so that the charging pile and the branch pipe perform heat exchange;

the branch pipes are respectively provided with an electronic water valve for adjusting the flow of the cooling liquid in the branch pipes;

the temperature sensors are arranged on the charging piles in the charging pile group and connected with the controller, and are used for acquiring the current temperature of each charging pile;

the controller is used for identifying the first infrared image data to obtain the current temperature of each charging pile; acquiring real-time estimated heating values of all charging piles in a charging pile group, and determining estimated temperatures of all the charging piles based on the real-time estimated heating values of all the charging piles and the current temperature;

The second transmission pipeline is provided with refrigeration equipment for compressing and transmitting the refrigerant in the second transmission pipeline so that the refrigerant radiates heat outwards;

the second transmission pipeline is provided with an electronic expansion valve for adjusting the flow of the refrigerant in the second transmission pipeline;

the controller is further used for determining first heat transfer losses of the cooling liquid in the first transmission pipeline at different flow rates and different temperatures according to second infrared image data of the first transmission pipeline between the heat exchanger and the charging pile; determining a second heat transfer loss of the refrigerant in a second transfer line between the refrigeration equipment and the heat exchanger at different flow rates and different temperatures from third infrared image data of the second transfer line;

the controller is further configured to determine, according to the first heat transfer loss, the second heat transfer loss, and the estimated temperatures of the charging piles, an optimal cooling liquid flow of the cooling liquid in the first transmission pipeline for cooling the charging piles, and an optimal refrigerant flow and heat dissipation power output by the refrigeration device;

the controller is respectively connected with the electronic water pump and the electronic water valve and is used for sending control instructions to the electronic water pump and the electronic water valve so that the cooling liquid in each branch pipe for cooling each charging pile flows in the corresponding optimal cooling liquid flow;

The controller is respectively connected with the refrigeration equipment and the electronic expansion valve and is used for sending a control instruction to the refrigeration equipment so that the refrigeration equipment runs with the heat dissipation power; and the electronic expansion valve is used for sending a control instruction to the electronic expansion valve so that the refrigerant in the second transmission pipeline flows at the optimal refrigerant flow rate.

Compared with the prior art, the technical scheme of the invention has the following advantages: according to the embodiment of the invention, the actual temperature of each charging pile is determined by acquiring the real-time infrared image data of each charging pile in the charging pile group, the estimated temperature of each charging pile is determined according to the estimated heating value of the charging pile, the heat transfer loss of liquid in each pipeline when the charging pile is cooled is determined according to the infrared image data of each pipeline in the heat radiation equipment, and then the optimal cooling liquid temperature and the optimal cooling liquid flow of cooling liquid flowing through different charging piles are determined according to the working state of each device of the heat radiation equipment of the charging pile when the charging piles are cooled respectively; according to the optimal cooling liquid temperature and the working states of all devices of the refrigeration equipment for cooling the cooling liquid, the optimal refrigerant temperature and the optimal refrigerant flow of the refrigerant in the refrigeration equipment for cooling the cooling liquid are reversely pushed, and finally the heat dissipation power of the refrigeration equipment is determined; finally, according to the obtained heat dissipation power, the optimal refrigerant flow and the optimal cooling flow, each device in the heat treatment system of the charging piles is controlled to work.

Drawings

Fig. 1 is a schematic flow chart of a heat treatment method of a charging pile based on real-time infrared image data according to an embodiment of the present invention;

FIG. 2 is a flowchart of a method for determining a real-time estimated heating value according to an embodiment of the present invention;

fig. 3 is a schematic flow chart of a heat treatment method for a charging pile based on real-time infrared image data according to another embodiment of the present invention;

fig. 4 is a schematic flow chart of a heat treatment method for a charging pile based on real-time infrared image data according to another embodiment of the present invention;

fig. 5 is a schematic flow chart of a heat treatment method for a charging pile based on real-time infrared image data according to another embodiment of the present invention;

fig. 6 is a schematic flow chart of a heat treatment method for a charging pile based on real-time infrared image data according to another embodiment of the present invention;

fig. 7 is a schematic flow chart of a heat treatment method for a charging pile based on real-time infrared image data according to another embodiment of the present invention;

fig. 8 is a schematic flow chart of a heat treatment method for a charging pile based on real-time infrared image data according to another embodiment of the present invention;

fig. 9 is a flowchart illustrating a heat treatment method for a charging pile based on real-time infrared image data according to another embodiment of the present invention;

Fig. 10 is a schematic structural diagram of a heat treatment system for a charging pile based on real-time infrared image data according to another embodiment of the present invention;

fig. 11 is a schematic structural diagram of a heat treatment system for a charging pile based on real-time infrared image data according to another embodiment of the present invention;

fig. 12 is a schematic diagram of a synchronous motor control circuit according to another embodiment of the present invention;

fig. 13 is a schematic diagram of parameters of a synchronous motor control circuit according to another embodiment of the present invention in a three-phase pwm mode;

fig. 14 is a schematic diagram of parameters of a synchronous motor control circuit according to another embodiment of the present invention in a two-phase pwm mode.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

As shown in fig. 1, the heat treatment method for the charging pile based on the real-time infrared image data provided by the embodiment of the invention, as shown in fig. 1, comprises the following steps:

s01, acquiring first infrared image data of each charging pile in a charging pile group in real time, and identifying the first infrared image data to obtain the current temperature of each charging pile; and acquiring the real-time estimated heating value of each charging pile in the charging pile group, and determining the estimated temperature of each charging pile based on the real-time estimated heating value and the current temperature of each charging pile.

In this embodiment, the current temperature of each charging pile is obtained by acquiring the infrared image data of each charging pile in real time and identifying the infrared image data, and the infrared image data in the scheme can check the real-time state of each charging pile on the one hand, for example, whether people appear near the charging pile can be determined by a person identification mode, and further whether the charging pile is damaged or not is determined by carrying out action identification on the person, so that timely alarm is realized, which is equivalent to combining the function of determining the temperature of the charging pile into an infrared monitoring camera of the charging pile, and conveniently and rapidly determining the temperature of the charging pile.

Because the quick charging modes which can be selected by different vehicle types are different, the real-time charging power of the charging pile can be determined according to the accessed vehicle types, the estimated heating value of the charging pile can be determined according to the charging power, or the vehicle type data of the accessed vehicle types can be obtained, and the estimated heating value of the current charging pile can be determined according to the heating value generated by the corresponding vehicle types in the historical data during charging.

Specifically, as shown in fig. 2, obtaining the real-time estimated heating value of each charging pile in the charging pile group includes:

s21, acquiring real-time operation power and estimated operation time length of each charging pile.

S22, calculating real-time estimated heating value according to the real-time operation power and the estimated operation time length.

In this embodiment, after the charging pile is connected to the electric vehicle, the generated heat value when the electric vehicle is full of electric power is calculated according to the charging power of the current charging pile and the time length that the charged vehicle needs to be full of electric power, and the estimated running time length and the real-time running power of the charging pile, that is, the estimated heat value is real-time.

In this embodiment, the estimated heating value is calculated, which may be calculated according to the real-time power of the charging pile and the resistance of the cable in the charging pile through a physical formula, or may also be calculated according to the heating value of the charging pile published by the charging pile manufacturer in unit time under different working powers.

In this embodiment, the estimated temperature of each charging pile is calculated, so that the temperature rise which can be caused by the estimated heating value in real time can be determined according to the temperature change condition of the charging pile caused by different heating values in the historical data, and the estimated temperature of each charging pile is obtained by combining the current temperature; or calculating the estimated temperature according to the temperature change caused by different charging heat according to the test data of the charging pile manufacturer; and the temperature change caused by the estimated heating value can be calculated according to the specific heat capacity of the charging pile.

S02, determining first heat transfer losses of cooling liquid in a first transmission pipeline at different flow rates and different temperatures according to second infrared image data of the first transmission pipeline between a heat exchanger and a charging pile; determining a second heat transfer loss of the refrigerant in a second transfer line between the refrigeration equipment and the heat exchanger at different flow rates and different temperatures from third infrared image data of the second transfer line; and determining the optimal cooling liquid flow of the cooling liquid in each first transmission pipeline for cooling each charging pile, and the optimal refrigerant flow and heat dissipation power output by the refrigeration equipment according to the first heat transfer loss, the second heat transfer loss and the estimated temperature of each charging pile.

In this embodiment, the heat transfer loss of the transmission pipeline during the liquid transmission is determined by performing infrared image capturing on the transmission pipeline of the refrigeration device, for example, the heat transfer loss may be calculated according to the initial temperature of the pipeline and the temperature of the tail end of the pipeline, or the heat transfer loss may be calculated according to the heat absorption and heat dissipation conditions in the pipeline.

In this embodiment, in step S02, according to the first heat transfer loss, the second heat transfer loss, and the estimated temperature of each charging pile, an optimal cooling liquid flow rate of the cooling liquid in each first transmission pipeline for cooling each charging pile, and an optimal refrigerant flow rate and heat dissipation power output by the refrigeration device are determined, including the following steps

And S11, determining the optimal cooling liquid temperature output by the heat exchanger and the optimal cooling liquid flow of the cooling liquid in each first transmission pipeline for cooling each charging pile when the temperature of each charging pile is reduced from the corresponding estimated temperature to the safe temperature according to the first heat transfer loss.

In this embodiment, the first transmission pipeline may be a high temperature resistant pipe, and in the liquid transmission process, the transmission pipeline may emit heat outwards or absorb heat because of room temperature, which may all cause the temperature of the cooling liquid in the transmission pipeline to change, thereby affecting the cooling effect.

In this embodiment, the flow rate of the cooling liquid in the pipeline is kept consistent, and the cooling amounts required by different charging piles are different because of different working states, for example, some charging piles do not work, the charging piles do not need to cool, and at this time, the cooling liquid transmission pipeline corresponding to the charging piles needs to be closed; and because the cooling amount of demand is different, at this moment, according to the difference of electric pile cooling demand that fills, through the passageway size of the switching degree adjustment pipeline of the electronic valve on the transmission pipeline that every fills electric pile corresponds, and then adjust corresponding coolant liquid flow to make each fill electric pile and can reach safe temperature respectively, improve the energy efficiency.

In this embodiment, it is desirable that each charging pile respectively reach a safe temperature, the opening and closing degree of the electronic valve on the first transmission pipeline corresponding to each charging pile can be controlled according to the ratio of the temperature difference according to the temperature difference that each charging pile reduces from the estimated temperature to the safe temperature, and the ratio of the opening and closing degree is consistent with the ratio of the temperature difference, so that each charging pile can be better cooled respectively.

In this embodiment, the safe temperature may be room temperature or a preset temperature threshold.

And S12, calculating to obtain a first temperature to be cooled of the cooling liquid returned to the heat exchanger according to the safe temperature and the first heat transfer loss.

In this embodiment, when the cooling liquid passes through the charging pile, the cooling liquid in the pipeline and the cooling liquid carried by the charging pile are mixed in a mixing manner, and according to the method, the cooling liquid in the pipeline which is finally output becomes a safe temperature, or the cooling liquid in the pipeline also becomes the safe temperature after passing through the charging pile in other manners of fully performing heat exchange.

In this embodiment, the first temperature to be cooled of the cooling liquid, that is, the real-time temperature of the cooling liquid, when the cooling liquid returns to the heat exchanger is calculated according to the temperature of the cooling liquid after passing through the charging pile and the first heat transfer loss of the pipeline transmission cooling. At this time, if the safe temperature is room temperature, the temperature of the coolant returned to the heat exchanger is still room temperature, and if the safe temperature is lower than room temperature, the temperature of the coolant returned to the heat exchanger is higher than the temperature of the coolant after passing through the charging pile, and if the safe temperature is higher than room temperature, the temperature of the coolant returned to the heat exchanger is lower than the temperature of the coolant after passing through the charging pile.

And S13, determining the optimal refrigerant temperature and the optimal refrigerant flow output by the refrigeration equipment when the first temperature to be cooled is reduced to the optimal cooling liquid temperature according to the second heat transfer loss.

In this embodiment, the second transmission pipeline may be a high temperature resistant pipe, and in the liquid transmission process, the transmission pipeline may release heat or absorb heat outwards due to a temperature difference, which may cause a change in temperature of the refrigerant in the pipeline, so as to change the refrigeration power of the refrigeration device to satisfy the refrigeration of the device.

In this embodiment, based on the heat transfer loss of the refrigerant in the second pipeline, the heat dissipation requirement of the cooling liquid in the first transmission pipeline at the heat exchanger is used to calculate the temperature and the refrigerant flow of the output refrigerant at the required refrigeration equipment for reducing the cooling liquid in the first transmission pipeline from the first temperature to be cooled to the optimal cooling liquid temperature, and the accurate temperature control of the refrigerant and the cooling liquid is completed through control, so that the temperature control efficiency is improved.

And S14, calculating to obtain a second temperature to be cooled of the refrigerant returned to the refrigeration equipment according to the optimal cooling liquid temperature and the second heat transfer loss.

In this embodiment, after the refrigerant passes through the heat exchanger, the temperature of the refrigerant may be increased to an optimal cooling liquid temperature, for example, heat exchange is implemented at the heat exchanger in a mixing manner, so that the temperature of the cooling liquid is reduced to the optimal cooling liquid temperature, so that the cooling liquid output in the first transmission pipeline meets the subsequent cooling requirement, and the temperature of the refrigerant may also be increased to the optimal cooling liquid temperature. Of course, the heat transfer can be performed by other manners of performing sufficient heat exchange in this solution, and since the coolant in the first transmission pipeline is required to reach the optimal coolant temperature, the temperature of the refrigerant will eventually be increased to the optimal coolant temperature.

In one embodiment, even if the temperature cannot be directly reached to the optimal temperature due to heat exchange in a mode other than mixing or other sufficient heat exchange, the temperature control of the charging pile can be realized by continuously adjusting the refrigerating capacity of the refrigerating equipment due to the fact that the estimated temperature is determined by acquiring the estimated heating value of the temperature of the charging pile in real time in the scheme, and the waste caused by single temperature control can be greatly avoided.

In order to calculate the working power of the refrigeration equipment, in the scheme, the second temperature to be cooled of the refrigerant returning to the refrigeration equipment is calculated based on the optimal cooling liquid temperature of the refrigerant after passing through the heat exchanger and the heat transfer loss of the second transmission pipeline.

S15, determining the heat radiation power of the refrigeration equipment according to the second temperature to be cooled and the optimal refrigerant temperature.

In this embodiment, the temperature to be reduced of the refrigerant is determined according to the second temperature to be cooled and the optimal refrigerant temperature entering the refrigeration device, and then the heat dissipation power of the refrigeration device is determined according to the refrigeration effect of the refrigeration device. The refrigerating effect of the refrigerating equipment can be determined according to historical operation data of the refrigerating equipment, and the temperature reducing effect of different powers on refrigerants with different temperatures can be determined directly from the temperature control effect of the refrigerants with different powers published by authorities.

Further, in a preferred embodiment, when the heat dissipation power is greater than the maximum operation power of the refrigeration device, the refrigeration device is cooled by the heat dissipation fan, wherein the heat dissipation effect of the heat dissipation fans of different windshields on the condenser in the refrigeration device can be determined through testing in advance, and when the required heat dissipation power is greater than the maximum operation power, the heat dissipation capacity is improved by adjusting the windshields of the heat dissipation fans, so that the heat dissipation power of the refrigeration device is adjusted, the temperature control range of the temperature control system is improved, and the overheat problem of the charging pile is avoided.

In this embodiment, the time parameters of the heat transfer loss, the flow rate and the heat dissipation power determined in each step are the time of the real-time estimated heating value determined in S01, where the time of calculating the real-time estimated heating value may be a preset unit time length or an operation time length of the charging pile that stops operation most quickly; and calculating to obtain the real-time estimated heating value according to the heat dissipation capacity of the charging pile under different charging powers and the time length required to carry out temperature control.

The heat dissipation capacity of the charging pile under different charging powers can be calculated according to the temperature variation of the heat dissipation equipment of the charging pile along with time under different charging powers in historical operation data; or determining the heat dissipation capacity of the charging pile, which changes with time under different charging powers, by performing operation tests on the charging pile;

for example, under the condition of determining the flow rate, the heat transfer loss of the liquid with unit flow rate increases with time, for example, the time for determining the heat dissipation power of the refrigeration equipment is determined according to the time length of the real-time estimated heat generation amount of each charging pile in S01, and the time length for calculating each parameter in the scheme is the time length of the calculated real-time estimated heat generation amount.

S03, controlling the cooling liquid in each first transmission pipeline for cooling each charging pile to flow at the optimal cooling liquid flow rate, controlling the refrigerant in the refrigeration equipment to flow at the optimal refrigerant flow rate and controlling the refrigeration equipment to operate at the heat dissipation power.

In this embodiment, the operation control manner of each device and apparatus in the temperature control system is determined through the above steps, so that the cooling liquid in the first transmission pipeline for cooling the charging piles flows with the optimal cooling liquid flow, for example, the liquid flow rate in the first transmission pipeline is controlled by the electronic water pump, the liquid speeds in the pipelines are consistent, and the flow control of the first transmission pipeline corresponding to each charging pile can be realized by controlling the opening and closing degree of the electronic water valve.

According to the embodiment, the actual temperature of each charging pile is determined by acquiring real-time infrared image data of each charging pile in the charging pile group, the estimated temperature of each charging pile is determined according to the estimated heating value of the charging pile, the heat transfer loss of liquid in each pipeline when the charging pile is cooled is determined according to the infrared image data of each pipeline in the heat dissipation equipment, and then the optimal cooling liquid temperature and the optimal cooling liquid flow of cooling liquid flowing through different charging piles are determined according to the working state of each device of the charging pile heat dissipation equipment when the charging piles are cooled respectively; according to the optimal cooling liquid temperature and the working states of all devices of the refrigeration equipment for cooling the cooling liquid, the optimal refrigerant temperature and the optimal refrigerant flow of the refrigerant in the refrigeration equipment for cooling the cooling liquid are reversely pushed, and finally the heat dissipation power of the refrigeration equipment is determined; finally, according to the obtained heat dissipation power, the optimal refrigerant flow and the optimal cooling flow, each device in the heat treatment system of the charging piles is controlled to work.

As shown in fig. 4, an embodiment of the present invention provides a heat treatment method for a charging pile based on real-time infrared image data, which is different from the heat treatment method shown in fig. 3 in that a first heat transfer loss of a cooling liquid in a first transmission pipeline between a heat exchanger and a charging pile at different flow rates and different temperatures is determined according to second infrared image data of the first transmission pipeline, and includes the following steps:

s31, identifying the second infrared image data to obtain the temperature difference between the cooling liquid in the first transmission pipeline and the room temperature; and calculating the heat loss of the first cooling liquid under different flow rates according to the length of the first transmission pipeline between the cooling liquid output by the heat exchanger and the charging pile, the heat conduction coefficient and the temperature difference between the cooling liquid in the first transmission pipeline and the room temperature.

S32, calculating to obtain the heat loss of the second cooling liquid under different flow rates according to the length and the heat conduction coefficient of the first transmission pipeline between the cooling liquid output by the charging pile and the heat exchanger and the temperature difference between the cooling liquid in the first transmission pipeline and the room temperature.

In this embodiment, the greater the heat loss per unit volume of the cooling liquid in the pipe increases with the length of the pipe, the greater the heat conduction coefficient of the pipe for heat transfer into the air due to the cooling liquid in the pipe, the greater the heat loss per unit volume of the cooling liquid, the greater the temperature difference between the cooling liquid and the room temperature, which results in an increase in the rate of heat transfer; while a larger flow rate and cross-sectional area of the liquid reduces the heat loss per unit volume of the cooling liquid, i.e. the larger the flow rate of the cooling liquid, the smaller the heat loss per unit volume of the cooling liquid.

S33, calculating to obtain the first heat transfer loss according to the first cooling liquid heat loss and the second cooling liquid heat loss.

In this embodiment, when the temperature difference between the cooling liquid and the room temperature is positive, the cooling liquid will release heat to the outside, at this time, the temperature of the cooling liquid will decrease, i.e. the heat loss is positive, when the temperature difference between the cooling liquid and the room temperature is negative, the cooling liquid will absorb heat to the outside, at this time, the temperature of the cooling liquid will increase, i.e. the heat loss is negative, and when the temperature difference between the cooling liquid and the room temperature is 0, the cooling liquid is transported, and the temperature of the cooling liquid will not change.

Specifically, the process of calculating the heat loss in step S31 and step S32 includes: the heat loss coefficient is calculated by the following formula:

wherein J1 is the heat loss coefficient of the cooling liquidT1 is the temperature difference between the cooling liquid and the room temperature,the absolute value of the temperature difference between the cooling liquid and the room temperature is that b is a preset constant which is larger than or equal to 1, k1 is the heat conduction coefficient of the first transmission pipeline for conducting heat to the air, v1 is the flow velocity of the cooling liquid in the first transmission pipeline, s1 is the cross section area of the first transmission pipeline, q1 is the preset constant, L1 is the length of the first transmission pipeline, and a is the adjustment constant.

And calculating the heat loss of the first cooling liquid or the heat loss of the second cooling liquid according to the current temperature and the heat loss coefficient of the cooling liquid in the first transmission pipeline.

In this embodiment, the temperature change condition of different coolant temperatures is calculated according to the heat loss coefficient, for example, the temperature t=t1-t1×j1 after the change is calculated, and then the heat loss condition in the coolant transmission process can be obtained according to the specific heat capacity and the temperature change amount of the coolant, so as to implement a more accurate heat treatment method.

As shown in fig. 5, in the present embodiment, when determining in step S11 that each charging pile is reduced from the corresponding estimated temperature to the safe temperature, the optimal cooling liquid temperature output by the heat exchanger includes the following steps:

s41, determining the total heat transfer amount of the charging piles to the first transmission pipeline when the charging piles are respectively reduced from the corresponding estimated temperature to the safe temperature.

In this embodiment, according to the estimated temperature of each charging pile obtained by estimation, when the estimated temperature is reduced to the safe temperature, the total heat transfer amount of each charging pile to the first transmission pipeline is respectively calculated, so that the heat absorption amount of the cooling liquid can be obtained.

S42, calculating to obtain the optimal cooling liquid temperature output by the heat exchanger according to the safe temperature, the total heat transfer amount of the charging pile to the first transmission pipeline and the heat loss of the first cooling liquid.

In this embodiment, according to the preferred situation after the temperature of the cooling liquid rises, the cooling liquid absorbs heat and also has a safe temperature, for example, the heat exchange is performed in the mixing manner adopted in the above embodiment, and at this time, the temperature of the cooling liquid is also a safe temperature, and at this time, the optimal cooling liquid temperature of the cooling liquid output by the heat exchanger can be calculated according to the heat loss of the cooling liquid transferred from the heat exchanger to the charging pile.

In a specific embodiment, calculating the first temperature to be cooled of the coolant returned to the heat exchanger based on the safe temperature and the first heat transfer loss includes: and calculating the first temperature to be cooled according to the safe temperature and the heat loss of the second cooling liquid. In this embodiment, the temperature at which the coolant returns to the heat exchanger is calculated from the heat loss of the second coolant, which is transferred from the charging stake to the heat exchanger, based on the temperature of the coolant after passing through the charging stake.

As shown in fig. 6, in the present embodiment, when determining in step S11 that each charging pile is reduced from the corresponding estimated temperature to the safe temperature, an optimal cooling liquid flow rate of the cooling liquid in each first transmission pipeline for reducing the temperature of each charging pile is determined, including the following steps:

S51, determining heat transfer quantity of each charging pile to the first transmission pipeline when each charging pile is reduced from the corresponding estimated temperature to the safe temperature.

In this embodiment, the heat dissipation capacity of the charging pile under different charging powers can be calculated according to the temperature variation of the heat dissipation device of the charging pile over time under different charging powers in the historical operation data; or determining the heat dissipation capacity of the charging pile, which changes with time under different charging powers, by performing operation tests on the charging pile; the heat dissipation capacity required by the charging pile is the heat transfer capacity of the charging pile to the first transmission pipeline.

And S52, calculating to obtain the temperature of the cooling liquid input into each charging pile for cooling according to the optimal cooling liquid temperature and the heat loss of the first cooling liquid.

In this embodiment, the temperature of the cooling fluid when the cooling fluid is transferred to the charging pile is calculated according to the optimal cooling fluid temperature and the heat loss of the first cooling fluid in the process of transferring the cooling fluid from the heat exchanger to the charging pile.

And S53, respectively calculating the flow of the cooling liquid in each first transmission pipeline for cooling each charging pile according to the safety temperature, the cooling liquid temperature and the heat transfer quantity of each charging pile to the first transmission pipeline, and taking the flow of the cooling liquid in each first transmission pipeline for cooling each charging pile as the optimal cooling liquid flow.

In this embodiment, according to the temperature of the cooling liquid input into the charging piles, the temperature of the cooling liquid after passing through the charging piles, and the specific heat capacity of the cooling liquid, the heat absorbed by the cooling liquid in unit volume can be obtained, according to the heat transfer amount of each charging pile to the first transmission pipeline, the volume of the cooling liquid passing through each charging pile, that is, the total volume of the cooling liquid passing through each charging pile can be calculated, and according to the scheme, the time for controlling the temperature of the charging piles can be calculated, so that the flow of the cooling liquid passing through each charging pile can be obtained.

In this embodiment, under the condition that the flow rate of the cooling liquid in the pipeline is determined, the flow rate of the cooling liquid flowing through each charging pile can be adjusted by adjusting the cross-sectional area of the transmission pipeline flowing through each charging pile, specifically, an electronic valve can be installed on the pipeline corresponding to each charging pile, the adjustment of the cross-sectional area of the pipeline is completed by controlling the opening and closing degree of the electronic valve, and an electronic water pump can be installed on the main pipeline of the transmission pipeline, and the adjustment of the flow rate of the cooling liquid in the transmission pipeline is completed by controlling the power of the electronic water pump.

As shown in fig. 7, an embodiment of the present invention provides a heat treatment method for a charging pile based on real-time infrared image data, which is different from the heat treatment method shown in fig. 3 in that a second heat transfer loss of a refrigerant in a second transmission pipeline between a refrigeration device and a heat exchanger at different flow rates and different temperatures is determined according to third infrared image data of the second transmission pipeline, and includes the following steps:

S61, recognizing the third infrared image data to obtain a temperature difference between the refrigerant in the second transmission pipeline and the room temperature; and calculating the heat loss of the first refrigerant under different flow rates according to the length of the second transmission pipeline between the output refrigerant of the heat exchanger and the refrigeration equipment, the heat conduction coefficient and the temperature difference between the refrigerant in the second transmission pipeline and the room temperature.

And S62, calculating to obtain the heat loss of the second refrigerant under different flow rates according to the length and the heat conduction coefficient of the second transmission pipeline between the output refrigerant of the refrigeration equipment and the heat exchanger and the temperature difference between the refrigerant in the second transmission pipeline and the room temperature.

And S63, calculating the second heat transfer loss according to the first refrigerant heat loss and the second refrigerant heat loss.

In this embodiment, the heat transfer loss of the refrigerant in the second transmission pipe is identical to that of the cooling liquid in the above embodiment, and this solution is not described here again.

Specifically, the process of calculating the heat loss in step S61 and step S62 includes: the heat loss coefficient is calculated by the following formula:

wherein J2 is the heat loss coefficient of the refrigerant, T2 is the temperature difference between the refrigerant and the room temperature, The absolute value of the temperature difference between the refrigerant and the room temperature is b being a preset constant which is greater than or equal to 1, k2 being a heat conduction coefficient of the second transmission pipeline for conducting heat to the air, v2 being the flow velocity of the refrigerant in the second transmission pipeline, s2 being the cross-sectional area of the first transmission pipeline, q2 being the preset constant, L2 being the length of the second transmission pipeline, and a being the adjustment constant.

And calculating the heat loss of the first refrigerant or the heat loss of the second refrigerant according to the current temperature and the heat loss coefficient of the refrigerant in the second transmission pipeline.

In this embodiment, the temperature change conditions of different refrigerant temperatures are calculated according to the heat loss coefficients, for example, the changed temperature t=t2-t2×j2, and after the changed temperature is calculated, the heat loss condition in the refrigerant transmission process can be obtained according to the specific heat capacity and the temperature change amount of the refrigerant, so as to implement a more accurate heat treatment method

As shown in fig. 8, in the present embodiment, when it is determined in step S13 that the first temperature to be cooled is reduced to the optimal coolant temperature, the optimal refrigerant temperature output by the refrigeration apparatus includes the steps of:

s71, determining the total heat transfer amount of the cooling liquid transferred to the refrigerant when the cooling liquid in the heat exchanger is reduced from the first temperature to be cooled to the optimal cooling liquid temperature.

In the present embodiment, the heat absorption amount of the refrigerant can be obtained according to the heat transfer amount of the coolant to the second transfer pipe when the coolant in the heat exchanger is reduced from the first temperature to be cooled to the optimal cooling temperature.

And S72, calculating to obtain the optimal refrigerant temperature output by the refrigeration equipment according to the optimal refrigerant temperature, the total heat transfer amount of the refrigerant to the refrigerant and the heat loss of the first refrigerant.

In this embodiment, according to the preferred situation after the temperature of the refrigerant increases, the temperature of the refrigerant increases after absorbing heat, and then the refrigerant is the optimal cooling liquid temperature, for example, the heat exchange is performed in the mixing manner adopted in the above embodiment, and at this time, the temperature of the refrigerant and the temperature of the cooling liquid are both the optimal cooling liquid temperature, and at this time, the optimal refrigerant temperature of the refrigerant output by the refrigeration device can be calculated according to the heat loss of the refrigerant transferred from the refrigeration device to the heat exchanger.

In a specific embodiment, calculating the second temperature to be cooled of the refrigerant returning to the refrigeration appliance based on the optimal coolant temperature and the second heat transfer loss includes: and calculating the second temperature to be cooled of the refrigerant returned to the refrigeration equipment according to the optimal cooling liquid temperature and the second refrigerant heat loss. In the present embodiment, the temperature at which the refrigerant returns to the refrigeration apparatus, that is, the second temperature to be cooled, is calculated from the heat loss of the second refrigerant, which is transmitted from the heat exchanger to the refrigeration apparatus, based on the temperature of the refrigerant passing through the heat exchanger.

As shown in fig. 9, in the present embodiment, when it is determined in step S13 that the first temperature to be cooled is reduced to the optimal cooling liquid temperature, the refrigeration apparatus outputs an optimal refrigerant flow rate, including:

s81, determining the total heat transfer amount of the cooling liquid transferred to the refrigerant when the cooling liquid in the heat exchanger is reduced from the first temperature to be cooled to the optimal cooling liquid temperature.

In this embodiment, based on the above embodiment, since the flow rate in the first transmission pipe has been calculated, the total amount of heat transfer required to be transferred to the refrigerant by the coolant in the temperature control period of this embodiment can be determined based on the temperature decrease range of the coolant and the specific heat capacity of the coolant.

And S82, calculating the refrigerant temperature of the refrigerant input to the heat exchanger according to the optimal refrigerant temperature and the heat loss of the first refrigerant.

In this embodiment, the temperature of the refrigerant when the refrigerant is transferred to the heat exchanger is calculated based on the optimal refrigerant temperature and the heat loss of the first coolant during the transfer of the refrigerant from the refrigeration equipment to the heat exchanger.

And S83, calculating the flow of the refrigerant in the second transmission pipeline in the heat exchanger according to the optimal cooling liquid temperature, the refrigerant temperature and the total heat transfer amount of the cooling liquid transferred to the refrigerant, and taking the flow as the optimal refrigerant flow.

In this embodiment, the heat absorbed by the refrigerant in unit volume can be obtained according to the temperature of the refrigerant input into the heat exchanger, the temperature of the refrigerant passing through the heat exchanger, and the specific heat capacity of the refrigerant, and the total heat transfer amount required to be transferred to the refrigerant by the cooling liquid can be calculated to obtain the volume of the refrigerant passing through the heat exchanger.

In this embodiment, under the condition that the flow rate of the refrigerant in the pipeline is determined, the flow rate of the refrigerant can be adjusted by adjusting the cross-sectional area of the second transmission pipeline, specifically, an electronic expansion valve can be installed on the second transmission pipeline, and the adjustment of the cross-sectional area of the second transmission pipeline can be completed by controlling the opening and closing degree of the electronic expansion valve.

In the present embodiment, in step S15, the heat dissipation power of the refrigeration device is determined according to the second temperature to be cooled and the optimal refrigerant temperature, including the steps of: and according to the second temperature to be cooled and the optimal refrigerant temperature, calculating the heat quantity to be transferred when the refrigerant is cooled, and calculating the heat dissipation power of the refrigeration equipment.

In this embodiment, after determining the flow rate of the refrigerant, according to the temperature at which the refrigerant needs to drop, the heat that needs to be transferred for cooling the refrigerant can be calculated by combining the flow rate of the refrigerant and the specific heat capacity of the refrigerant, thereby calculating the heat dissipation power of the refrigeration device.

Further, in a preferred embodiment, when the heat dissipation power is greater than the maximum operation power of the refrigeration device, the refrigeration device is cooled by the heat dissipation fan, wherein the heat dissipation effect of the heat dissipation fans of different windshields on the condenser in the refrigeration device can be determined through testing in advance, and further, when the required heat dissipation power is greater than the maximum operation power, the heat dissipation capacity is improved by adjusting the windshields of the heat dissipation fan, the heat required to be transmitted by cooling the refrigerant is subtracted by the calculated heat dissipation capacity of the heat dissipation fans to obtain the optimized heat dissipation capacity, the heat dissipation power of the refrigeration device is determined according to the optimized heat dissipation capacity, the temperature control range of the temperature control system is improved, and the overheat problem of the charging pile is avoided.

In a specific embodiment, the embodiment of the invention also provides a self-adaptive pulse width modulation synchronous motor control method based on a power supply, a three-phase inverter bridge circuit and a synchronous motor which are connected in sequence; in the permanent magnet synchronous motor control, the accuracy of current sampling directly affects the motor control performance, in this embodiment, the phase current is sampled by a single-resistor sampling mode, and the single-resistor sampling mode refers to that a current sampling resistor is connected in series between a three-phase inverter bridge and a power supply to sample the current, as shown in fig. 12.

The synchronous motor controlled by the synchronous motor control method is used for constructing the electronic water pump, the electronic water valve and the cooling fan in the embodiment.

In this embodiment, the synchronous motor control method includes:

s91, acquiring the running power of the synchronous motor.

And S92, controlling the switching state of each MOS tube in the three-phase inverter bridge according to the running power, and completing reconstruction of the three-phase current input into the synchronous motor.

In this embodiment, the switching states of the MOS transistors in the three-phase inverter bridge are adjusted according to the operating power, so that the three-phase current output by the three-phase inverter bridge satisfies the operating power of the synchronous motor.

In this embodiment, the switching states of the mos transistors in the three-phase inverter bridge, that is, the three-phase pulse width modulation modes, are adjusted, and the three phases of the three-phase inverter bridge are alternately turned on in one switching period in the three-phase pulse width modulation modes, but for phase circuit reconstruction, the center values of the three phases of the three-phase inverter bridge differ by 2 pi/3 phases. As shown in fig. 13, the ARR in the figure represents the count value of pulse width modulation, which is the number of times (one period) that the signal returns to the high level from the high level to the low level within 1 second, and Iu, iv and Iw respectively represent the time of single resistance sampling in the three-phase pulse width modulation mode, so that three-phase current can be directly measured in one pulse width modulation period.

S93, obtaining the reconstructed three-phase current, and determining the duty ratio of the synchronous motor in a pulse width modulation period.

In the present embodiment, the duty ratio means a proportion of the energization time with respect to the total time in one pulse cycle.

And S94, when the duty ratio is larger than a preset duty ratio threshold value, setting the level of any one phase of the three-phase inverter bridge to be low, and conducting the other two phases of the three-phase inverter bridge alternately according to the running power so that the synchronous motor runs at the running power.

In this embodiment, as shown in fig. 13, the duty ratio of the three-phase pwm mode cannot exceed 66.67%, otherwise, the situation that the sampling is inaccurate due to the simultaneous conduction time of the two phases occurs, so the preset duty ratio threshold may be 66.67% or 60%.

In this embodiment, when the duty ratio is too large, the three-phase pwm mode is converted into the two-phase pwm mode, where one phase is constantly low in one pwm period, the other two phases are alternately conducted, and the two phases that are alternately conducted are different from each other by pi phase. Fig. 14 shows the three-phase duty cycle and the timing of the single resistor sampling in the two-phase pwm mode, because only two phases are alternately conducted in each sector in the two-phase pwm mode, and the current of the other phase can be calculated.

Based on the scheme, in order to solve the problem that the current cannot be observed in the single-resistor sampling, the controller of the I department uses a special phase current reconstruction algorithm and is divided into a three-phase pulse width modulation mode when the synchronous motor is at a low speed and a two-phase pulse width modulation mode when the synchronous motor is at a high speed.

As shown in fig. 10 and 11, an embodiment of the present invention provides a heat treatment system for a charging pile based on real-time infrared image data, the heat treatment system including: the device comprises an infrared camera device, a charging pile group and a controller connected with each charging pile in the charging pile group.

In this embodiment, the infrared camera device is connected to the controller, and is configured to obtain, in real time, first infrared image data of each charging pile in the charging pile group, second infrared image data of a first transmission pipeline between the heat exchanger and the charging pile, and third infrared image data of a second transmission pipeline between the refrigeration device and the heat exchanger.

In this embodiment, the heat treatment system includes: the heat exchanger is communicated with the inlet and the outlet of the first transmission pipeline and the second transmission pipeline respectively and is used for enabling the cooling liquid in the first transmission pipeline and the refrigerant in the second transmission pipeline to exchange heat.

In this embodiment, an electronic water pump is disposed on the first transmission pipeline, and is used to adjust the flow rate of the cooling liquid in the first transmission pipeline.

In this embodiment, the first transmission pipeline has a plurality of branch pipes, and each branch pipe is paired with a corresponding charging pile respectively for the charging pile performs heat exchange with the branch pipe.

In this embodiment, the branch pipes are respectively provided with an electronic water valve for adjusting the flow rate of the cooling liquid in the branch pipe.

In this embodiment, a temperature sensor connected to the controller is disposed on each charging pile in the charging pile group, and is used to obtain the current temperature of each charging pile.

In this embodiment, the controller is configured to identify the first infrared image data to obtain a current temperature of each charging pile; and acquiring the real-time estimated heating value of each charging pile in the charging pile group, and determining the estimated temperature of each charging pile based on the real-time estimated heating value and the current temperature of each charging pile.

In this embodiment, the second transmission pipe is provided with a refrigeration device for compressing and transmitting the refrigerant in the second transmission pipe, so that the refrigerant radiates heat to the outside.

In this embodiment, an electronic expansion valve is disposed on the second transmission pipe, for adjusting the flow rate of the refrigerant in the second transmission pipe.

In this embodiment, the controller is further configured to determine, according to the first heat transfer loss, the second heat transfer loss, and the estimated temperatures of the charging piles, an optimal cooling liquid flow of the cooling liquid in the first transmission pipeline for cooling the charging piles, and an optimal refrigerant flow and heat dissipation power output by the refrigeration device.

In this embodiment, the controller is connected to the electronic water pump and the electronic water valve respectively, and is configured to send a control instruction to the electronic water pump and the electronic water valve, so that the cooling liquid in each branch pipe for cooling each charging pile flows with the corresponding optimal cooling liquid flow rate respectively; specifically, the control instruction is sent to the electronic water pump, the flow rate of the cooling liquid in the first transmission pipeline is adjusted through the electronic water pump, the control instruction is sent to the electronic water valve, the opening and closing degree of the electronic water valve is adjusted, and then the flow rate of the cooling liquid in the first transmission pipeline is completed Tao Zhengdi.

In this embodiment, the controller is connected to the refrigeration device and the electronic expansion valve, respectively, and is configured to send a control instruction to the refrigeration device, so that the refrigeration device operates with heat dissipation power; and the electronic expansion valve is used for sending a control instruction to the electronic expansion valve so that the refrigerant in the second transmission pipeline flows at the optimal refrigerant flow rate, and specifically, the opening and closing degree of the electronic expansion valve is controlled to adjust the flow rate of the refrigerant in the second transmission pipeline.

In this embodiment, the controller is further configured to determine, according to the first heat transfer loss, an optimal cooling liquid temperature output by the heat exchanger and an optimal cooling liquid flow of the cooling liquid in each first transmission pipeline for cooling each charging pile when each charging pile is reduced from a corresponding estimated temperature to a safe temperature.

In this embodiment, the controller is further configured to calculate a first temperature to be cooled of the coolant returned to the heat exchanger according to the safe temperature and the first heat transfer loss.

In this embodiment, the controller is further configured to determine, according to the second heat transfer loss, an optimal refrigerant temperature and an optimal refrigerant flow output by the refrigeration device when the first temperature to be cooled is reduced to the optimal cooling liquid temperature.

In this embodiment, the controller is further configured to calculate, according to the optimal cooling liquid temperature and the second heat transfer loss, a second temperature to be cooled of the refrigerant returned to the refrigeration device; and determining the heat radiation power of the refrigeration equipment according to the second temperature to be cooled and the optimal refrigerant temperature.

In a specific embodiment, compared with the embodiments shown in fig. 10 and 11, the difference is that the controller is specifically configured to obtain the real-time running power and the estimated running duration of each charging pile; and calculating the real-time estimated heating value according to the real-time operation power and the estimated operation time length.

In this embodiment, the heat treatment system further includes: the room temperature sensor is connected with the controller to obtain room temperature;

the controller is specifically used for identifying the second infrared image data to obtain the temperature difference between the cooling liquid in the first transmission pipeline and the room temperature; according to the length and the heat conduction coefficient of a first transmission pipeline between the cooling liquid output by the heat exchanger and the charging pile and the temperature difference between the cooling liquid in the first transmission pipeline and the room temperature, calculating to obtain the heat loss of the first cooling liquid under different flow rates; according to the length and the heat conduction coefficient of a first transmission pipeline between the charging pile and the heat exchanger and the temperature difference between the cooling liquid in the first transmission pipeline and the room temperature, calculating to obtain the heat loss of a second cooling liquid under different flow rates; and calculating the first heat transfer loss according to the first cooling liquid heat loss and the second cooling liquid heat loss.

In this embodiment, the length and the heat conduction coefficient of the first transmission pipeline between the cooling liquid output by the heat exchanger and the charging pile can be measured in advance and stored in the storage space of the controller, and can also be input in real time by a worker.

In this embodiment, the controller is specifically configured to calculate the heat loss coefficient by the following formula:

wherein J1 is the heat loss coefficient, T1 is the temperature difference between the cooling liquid and the room temperature,the absolute value of the temperature difference between the cooling liquid and the room temperature is that b is a preset constant which is larger than or equal to 1, k1 is the heat conduction coefficient of the first transmission pipeline for conducting heat to the air, v1 is the flow velocity of the cooling liquid in the first transmission pipeline, s1 is the cross section area of the first transmission pipeline, q1 is the preset constant, L1 is the length of the first transmission pipeline, and a is the adjustment constant.

The controller is specifically used for calculating the heat loss of the first cooling liquid or the heat loss of the second cooling liquid according to the temperature and the heat loss coefficient of the cooling liquid in the current first transmission pipeline.

In this embodiment, the controller is specifically configured to determine a total amount of heat transfer from the charging piles to the first transmission pipeline when each charging pile is respectively reduced from the corresponding estimated temperature to the safe temperature; and calculating to obtain the optimal cooling liquid temperature output by the heat exchanger according to the safe temperature, the total heat transfer amount of the charging pile to the first transmission pipeline and the heat loss of the first cooling liquid.

In this embodiment, the controller is specifically configured to calculate the first temperature to be cooled according to the safe temperature and the heat loss of the second cooling liquid.

In this embodiment, the controller is specifically configured to determine a heat transfer amount of each charging pile to the first transmission pipeline when each charging pile is reduced from the corresponding estimated temperature to the safe temperature; according to the optimal cooling liquid temperature and the heat loss of the first cooling liquid, calculating to obtain the cooling liquid temperature input into each charging pile for cooling; and respectively calculating the flow of the cooling liquid in the first transmission pipelines for cooling the charging piles according to the safety temperature, the cooling liquid temperature and the heat transfer quantity of the charging piles to the first transmission pipelines, and taking the flow of the cooling liquid in the first transmission pipelines for cooling the charging piles as the optimal cooling liquid flow.

In a specific embodiment, compared with the embodiment shown in fig. 10 and 11, the difference is that the controller is specifically configured to identify the third infrared image data to obtain a temperature difference between the refrigerant in the second transmission pipeline and the room temperature; according to the length and the heat conduction coefficient of a second transmission pipeline between the output refrigerant of the heat exchanger and the refrigeration equipment and the temperature difference between the refrigerant in the second transmission pipeline and the room temperature, calculating to obtain the heat loss of the first refrigerant under different flow rates; according to the length and the heat conduction coefficient of a second transmission pipeline between the output refrigerant of the refrigeration equipment and the heat exchanger and the temperature difference between the refrigerant in the second transmission pipeline and the room temperature, calculating to obtain the heat loss of the second refrigerant under different flow rates; and calculating the second heat transfer loss according to the first refrigerant heat loss and the second refrigerant heat loss.

In this embodiment, the length and the heat conduction coefficient of the second transmission pipe between the output refrigerant of the heat exchanger and the refrigeration equipment may be measured in advance and stored in the storage space of the controller, or may be input in real time by a worker.

wherein J2 is the heat loss coefficient, T2 is the temperature difference between the refrigerant and the room temperature,the absolute value of the temperature difference between the refrigerant and the room temperature is b being a preset constant which is greater than or equal to 1, k2 being a heat conduction coefficient of the second transmission pipeline for conducting heat to the air, v2 being a flow velocity of the refrigerant in the second transmission pipeline, s2 being a cross-sectional area of the second transmission pipeline, q2 being a preset constant, L2 being a length of the second transmission pipeline, and a being an adjustment constant.

In this embodiment, the controller is specifically configured to calculate the heat loss of the first refrigerant or the heat loss of the second refrigerant according to the current temperature and the heat loss coefficient of the refrigerant in the second transmission pipeline.

In this embodiment, the controller is specifically configured to determine a total amount of heat transfer from the coolant to the refrigerant when the coolant in the heat exchanger is reduced from the first temperature to be cooled to the optimal coolant temperature; and calculating to obtain the optimal refrigerant temperature output by the refrigeration equipment according to the optimal refrigerant temperature, the total heat transfer amount of the refrigerant transferred by the refrigerant and the heat loss of the first refrigerant.

In this embodiment, the controller is specifically configured to calculate, according to the optimal cooling liquid temperature and the heat loss of the second refrigerant, the second temperature to be cooled of the refrigerant returned to the refrigeration device.

In this embodiment, the controller is specifically configured to calculate, according to the second temperature to be cooled and the optimal refrigerant temperature, an amount of heat that needs to be transferred to cool the refrigerant, and calculate to obtain a heat dissipation power of the refrigeration device.

In this embodiment, the controller is specifically configured to determine a total amount of heat transfer from the coolant to the refrigerant when the coolant in the heat exchanger is reduced from the first temperature to be cooled to the optimal coolant temperature; calculating the refrigerant temperature of the refrigerant input to the heat exchanger according to the optimal refrigerant temperature and the first refrigerant heat loss; and calculating the flow of the refrigerant in the second transmission pipeline in the heat exchanger according to the optimal cooling liquid temperature, the refrigerant temperature and the total heat transfer quantity of the cooling liquid transferred to the refrigerant, and taking the flow as the optimal refrigerant flow.

In a specific embodiment, the heat treatment system further comprises: the liquid level acquisition device is connected with the controller and is arranged in the first transmission pipeline and used for acquiring the liquid level of the cooling liquid in the first transmission pipeline;

The heat treatment system further includes: the liquid supplementing kettle is connected with the controller and is used for supplementing cooling liquid for the first transmission pipeline;

in this embodiment, the controller is further configured to obtain a liquid level of the cooling liquid in the first transmission pipeline, and send a control instruction to the liquid replenishing kettle when the liquid level of the cooling liquid is lower than a preset liquid level, so as to control the liquid replenishing kettle to replenish liquid to the first transmission pipeline.

In a specific embodiment, the heat treatment system further comprises: and the cooling fan is connected with the controller and used for cooling the condenser in the refrigeration equipment.

In this embodiment, the main controller is specifically configured to, when the heat dissipation power required by the refrigeration device is greater than the maximum operating power, adjust a damper of the heat dissipation fan to increase the heat dissipation capacity by sending a control instruction to the heat dissipation fan, calculate the heat to be transferred by cooling the refrigerant, subtract the heat dissipation capacity of the heat dissipation fan, obtain an optimized heat dissipation capacity, determine the heat dissipation power of the refrigeration device according to the optimized heat dissipation capacity, and send a control instruction to the refrigeration device to enable the refrigeration device to operate according to the optimized heat dissipation power.

In a specific embodiment, the electronic water pump, the electronic water valve and the radiator fan in the heat treatment system all comprise a synchronous motor control circuit, and the synchronous motor control circuit is shown in fig. 12.

The synchronous motor control circuit includes: the power supply, the three-phase inverter bridge circuit and the synchronous motor are connected in sequence; and the synchronous motor controller is connected with each MOS tube in the three-phase inverter bridge circuit.

The synchronous motor controller is used for obtaining the running power of the synchronous motor, controlling the switching state of each MOS tube in the three-phase inverter bridge according to the running power, and completing the reconstruction of the three-phase current input into the synchronous motor.

The synchronous motor controller is also used for acquiring the three-phase current after reconstruction and determining the duty ratio of the synchronous motor in one pulse width modulation period; when the duty ratio is larger than a preset duty ratio threshold value, the level of any one phase input into the three-phase inverter bridge is set to be low, and the other two phases in the three-phase inverter bridge are alternately conducted according to the running power, so that the synchronous motor runs at the running power.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for heat treatment of a charging pile based on real-time infrared image data, the method comprising:

2. The heat treatment method according to claim 1, wherein determining an optimal coolant flow rate of the coolant in each of the first transfer pipes for cooling each of the charging piles, and an optimal refrigerant flow rate and heat dissipation power output by the refrigeration device, based on the first heat transfer loss, the second heat transfer loss, and the estimated temperature of each of the charging piles, comprises:

3. The heat treatment method according to claim 1, wherein the obtaining the real-time estimated heating value of each charging pile in the charging pile group includes:

4. The heat treatment method according to claim 2, wherein the determining the first heat transfer loss of the cooling liquid in the first transfer pipe at different flow rates and different temperatures from the second infrared image data of the first transfer pipe between the heat exchanger and the charging pile comprises:

5. The heat treatment method according to claim 4, wherein the calculation of the heat loss coefficient is performed by the following formula:

；

6. The heat treatment method according to claim 4, wherein the determining an optimal coolant temperature output from the heat exchanger when each of the charging piles is lowered from the corresponding estimated temperature to the safe temperature includes:

7. The heat treatment method according to claim 4, wherein the calculating a first temperature to be cooled of the cooling liquid returned to the heat exchanger based on the safe temperature and the first heat transfer loss includes:

8. The heat treatment method according to claim 4, wherein determining an optimal coolant flow rate of the coolant in each of the first transfer pipes for cooling each of the charging piles when each of the charging piles is cooled from the corresponding estimated temperature to the safe temperature, comprises:

9. The heat treatment method according to claim 2, wherein determining a second heat transfer loss of the refrigerant in the second transfer line at a different flow rate and a different temperature from the third infrared image data of the second transfer line between the refrigeration equipment and the heat exchanger comprises:

10. The heat treatment method according to claim 9, wherein the calculation of the heat loss coefficient is performed by the following formula:；

11. The heat treatment method according to claim 9, wherein the determining the optimal refrigerant temperature output by the refrigeration device when the first temperature to be cooled is reduced to the optimal coolant temperature includes:

12. The heat treatment method according to claim 9, wherein the calculating a second temperature to be cooled of the refrigerant returned to the refrigeration apparatus based on the optimal cooling liquid temperature and the second heat transfer loss includes:

13. The heat treatment method according to claim 2, wherein the determining the heat radiation power of the refrigeration apparatus according to the second temperature to be cooled and the optimal refrigerant temperature includes:

14. The heat treatment method according to claim 9, wherein determining that the refrigeration apparatus outputs an optimal refrigerant flow rate when the first temperature to be cooled is lowered to the optimal coolant temperature includes:

15. Charging pile heat treatment system based on real-time infrared image data, characterized in that the heat treatment system comprises: the controller is connected with each charging pile in the charging pile group;