CN211567595U - Defrosting control device of electric automobile heat pump air conditioner - Google Patents
Defrosting control device of electric automobile heat pump air conditioner Download PDFInfo
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- CN211567595U CN211567595U CN201921470214.XU CN201921470214U CN211567595U CN 211567595 U CN211567595 U CN 211567595U CN 201921470214 U CN201921470214 U CN 201921470214U CN 211567595 U CN211567595 U CN 211567595U
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Abstract
The utility model provides an electric automobile heat pump air conditioner's defrosting controlling means, including refrigerant circulating system, coolant liquid circulating system and middle heat exchanger, refrigerant circulating system establishes the contact through middle heat exchanger and coolant liquid circulating system, refrigerant circulating system realizes the flow of refrigerant equidirectional, coolant liquid circulating system realizes the flow of coolant liquid equidirectional. The utility model discloses a flow direction of control refrigerant and coolant liquid to reach different technological effects, can improve the super-cooled rate of refrigerant, reduce the fluctuation range of the interior temperature of car during the defrosting, shortened the defrosting cycle, improve defrosting efficiency.
Description
Technical Field
The utility model relates to an electric automobile air conditioner technical field, concretely relates to defrosting control device of electric automobile heat pump air conditioner.
Background
Because the heat exchanger in the HVAC of the automobile air conditioner is limited by the requirements of the HVAC on volume, weight and the like, the volume of the heat exchanger is smaller compared with that of a household air conditioner heat exchanger, so the heat exchange area is smaller, particularly for the heat pump automobile air conditioner, the supercooling degree of a refrigerant at the outlet of the heat exchanger at the inner side is generally smaller due to the insufficient heat exchange area, and thus the heating mode energy efficiency of the air conditioning system is very low, although the heating energy efficiency is still higher than that of the PTC, the energy efficiency advantage of the heat pump air conditioner cannot be fully highlighted.
The existing heat pump air-conditioning system of the electric automobile has no effective scheme to solve the problem of defrosting of an external heat exchanger at low temperature, and meanwhile, the temperature in the automobile is ensured not to fluctuate during defrosting; the defrosting logic of a common heat pump system basically adopts a switching refrigeration mode to supply heat for defrosting by depending on work of a compressor, in order to not affect comfort in a vehicle, the defrosting process adopts the schemes that low-temperature refrigerants do not enter a heat exchanger in the vehicle or the low-temperature refrigerants do not enter the heat exchanger in the vehicle but a fan in the vehicle does not blow air, and the like, but the defrosting schemes basically do not have heat absorbed by evaporation to ensure the circulation volume of the refrigerant in the system, the defrosting period is long, the defrosting effect is poor, long heat supply time after defrosting is recovered, temperature fluctuation in the vehicle is long, and the reliability of the system is affected.
SUMMERY OF THE UTILITY MODEL
To prior art's not enough, the utility model provides an electric automobile heat pump air conditioner's defrosting controlling means, including refrigerant circulating system, coolant liquid circulating system and middle heat exchanger, refrigerant circulating system establishes the contact through middle heat exchanger and coolant liquid circulating system, refrigerant circulating system realizes the not equidirectional flow of refrigerant, coolant liquid circulating system realizes the not equidirectional flow of coolant liquid.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a defrosting control method of an electric vehicle heat pump air conditioner selects different circulation modes through judgment of operation modes, wherein the circulation modes comprise a refrigerant circulation system and a cooling liquid circulation system, the refrigerant circulation system and the cooling liquid circulation system are connected through an intermediate heat exchanger, the different circulation modes specifically comprise that the circulation flow directions of refrigerant or cooling liquid are different, whether defrosting conditions are met or not is judged under the different circulation modes, if the defrosting conditions are met, the defrosting mode is entered, and otherwise, the original operation mode is maintained. The flow directions of the refrigerant and the cooling liquid are controlled to achieve different technical effects, the supercooling degree of the refrigerant can be improved, the fluctuation range of the temperature in the vehicle during defrosting is reduced, the defrosting period is shortened, and the defrosting efficiency is improved.
Further, the circulation mode includes a first mode, a second mode and a third mode, the first mode is a cycle in which air-conditioning refrigeration and battery forced cooling are simultaneously operated, the second mode is a cycle in which air-conditioning heating and battery heating are simultaneously operated, and the third mode is a cycle in which air-conditioning heating and coolant heat storage are simultaneously operated. The supercooling degree of the refrigerant circulating system can be effectively improved by simultaneously operating the air-conditioning refrigeration and the battery forced cooling for circulation, and the heating mode energy efficiency is improved; the battery is heated by the heat of the refrigerant which is circularly utilized through the simultaneous operation of air-conditioning heating and battery heating, so that the battery is always kept at the optimal working temperature, and the stable and reliable operation of the electric automobile is ensured; the heat can be stored in advance through the simultaneous operation circulation of air conditioning heating and cooling liquid heat storage, so that the heat can be conveniently utilized during defrosting, the defrosting period can be shortened, and the defrosting efficiency can be improved.
Further, the first mode uses a low-temperature refrigerant to transfer heat of the battery away through a cooling liquid circulation, so that the battery is at an optimal working temperature. The battery is prevented from being damaged due to overhigh temperature, the battery is always kept at the optimal working temperature, the stable operation of the electric automobile is guaranteed, and meanwhile the service life of the battery can be prolonged.
Further, the second mode transfers the heat of the refrigerant to the cooling liquid circulation system through the intermediate heat exchanger to heat the battery, so that the battery is at the optimal working temperature. The situation that the battery cannot normally provide power for the electric automobile in a low-temperature state is avoided, and the reliability of the battery and the electric automobile is ensured.
Further, the third mode transfers the heat of the refrigerant to the cooling liquid circulating system through the intermediate heat exchanger to heat the cooling liquid in the liquid storage tank. The heat of the refrigerant is transferred to the cooling liquid, and the heat is stored in advance, so that the refrigerant circulation quantity of a defrosting process system is ensured, and the external heat exchanger is effectively defrosted.
Further, the selecting different circulation modes by the judgment of the operation mode specifically includes: judging whether the operation mode is a heating operation mode, if not, continuing the operation in the current mode, if so, further judging whether the battery needs to be heated, if so, entering a logic control related to the heating of the battery, if not, judging whether the cooling liquid needs to store heat, if not, maintaining the current operation state, and if so, entering a logic control related to the heat storage of the cooling liquid. The aim of accurate control is achieved by correctly judging the operation mode, the heated battery is judged to ensure that the battery is kept at the optimal working temperature, the heat storage judgment of the cooling liquid is prepared for subsequent defrosting, the temperature regulation and control in the electric automobile can be ensured to be accurate, the electric automobile is stable and reliable in operation, and the defrosting efficiency is improved.
Further, the judging whether the defrosting entering condition is met specifically includes: judging whether the temperature T of the outer ring is less than a ℃, if the temperature T of the outer ring is more than or equal to a ℃, judging whether defrosting conditions are entered; and if the T outer ring is less than a ℃, continuously judging the compressor running time in the heating mode: if the running time H is less than H minutes, judging the defrosting condition, and if the running time H is more than or equal to H minutes, judging the defrosting condition; and (4) carrying out partition judgment on the outer ring temperature, and judging whether to enter a defrosting operation mode or not in different temperature areas according to time, wherein a is a preset temperature value, and h is a preset time value. Whether the defrosting operation mode is entered or not is accurately judged, and compared with the method that the defrosting operation mode is entered through simple judgment, the energy consumption of each part can be effectively utilized, unnecessary resource waste is avoided, and normal operation of the system is ensured.
Further, the refrigerant in the defrosting mode circulates without passing through the HVAC but is all evaporated by entering the intermediate heat exchanger. The low-temperature refrigerant does not need to pass through HVAC, the in-vehicle comfort and the system reliability of the heat pump defrosting at low temperature can be ensured, the heat supply in the vehicle can be recovered immediately after the heat pump defrosting is finished, the defrosting time is short, the heat supply recovery time is short, and the temperature in the vehicle is not fluctuated.
A defrosting control device of an electric automobile heat pump air conditioner works by using the defrosting control method of the electric automobile heat pump air conditioner.
Further, the refrigerant circulating system comprises a vapor-liquid separator, a compressor, a first three-way valve, a first two-way valve, an external heat exchanger, an external fan, a first expansion valve, a second two-way valve, an HVAC, a first temperature sensor and a second temperature sensor, wherein the HVAC comprises an internal fan, an evaporator, a mixing air door and a condenser, an outlet end of the compressor is connected with an inlet end of the condenser, an outlet end of the condenser is connected with an inlet end of the external heat exchanger through the first three-way valve, an outlet end of the external heat exchanger is connected with an inlet end of an intermediate heat exchanger through the second expansion valve, an outlet end of the external heat exchanger is also connected to an inlet end of the evaporator through the first expansion valve, an outlet end of the intermediate heat exchanger is connected to an, the utility model discloses a heat exchanger, including outer heat exchanger, vapour and liquid separator, compressor inlet end, evaporator outlet end, first temperature sensor, second temperature sensor, outer fan, interior fan, air mixing door, compressor inlet end, the vapour and liquid separator inlet end is connected to the compressor inlet end, the vapour and liquid separator inlet end is parallelly connected to outer heat exchanger inlet end through first two-way valve, the evaporator outlet end is parallelly connected to the vapour and liquid separator inlet end, first temperature sensor sets up in outer heat exchanger outlet end, second temperature sensor sets up in middle heat exchanger outlet end, outer fan sets up in.
Further, coolant liquid circulation system includes electronic water pump, PTC water heating electric heater, second three-way valve, battery cooling end, liquid storage pot and third temperature sensor, the heat exchanger entry end in the middle of electronic water pump exit end connection, the PTC water heating electric heater entry end is connected to the heat exchanger exit end in the middle of, PTC water heating electric heater exit end is connected to liquid storage pot and battery cooling end entry end respectively through the second three-way valve, liquid storage pot and battery cooling end exit end connect in parallel to the electronic water pump entry end, third temperature sensor sets up in the heat exchanger exit end in the middle.
When the circulation mode is in the first mode, the refrigerant flow condition of the refrigerant circulation system is specifically as follows: the refrigerant is compressed into high-temperature high-pressure steam by the compressor and enters the condenser, the condenser is a stable heat source at the moment, and the air flow is controlled by the HVAC internal temperature mixing air door to pass through or not pass through or partially pass through the condenser to form different air outlet temperatures, so that the temperature in the vehicle is regulated; after passing through the condenser, the refrigerant enters the heat exchanger outside the vehicle through a first three-way valve to be condensed, and then the refrigerant is divided: a part of refrigerant is throttled by a first expansion valve and then enters an evaporator to be evaporated and absorb heat; the other part of the refrigerant is throttled by a second expansion valve, enters an intermediate heat exchanger for evaporation and heat absorption, then passes through a second two-way valve and is converged with the refrigerant passing through the evaporator, and then the refrigerant enters a vapor-liquid separator and finally returns to the compressor to complete the circulation;
the coolant flow condition of the coolant circulation system is specifically as follows: the cooling liquid enters the intermediate heat exchanger through the electronic water pump for heat exchange, is cooled into liquid with lower temperature, then enters the second three-way valve through the PTC water heating electric heater (not working at the moment), then enters the battery cooling tail end to take away heat emitted by the battery pack, and then returns to the electronic water pump to complete circulation.
In the first mode, the heat of the battery is transferred away by using a low-temperature refrigerant through cooling liquid circulation, so that the battery is ensured to be at the optimal working temperature; while refrigerant circulation is still required to meet vehicle interior temperature comfort.
When the circulation mode is in the second mode, the refrigerant flow condition of the refrigerant circulation system is specifically as follows: the refrigerant is compressed into high-temperature high-pressure steam by a compressor and enters a condenser, the condenser is a stable heat source at the moment, and the air flow is controlled by an HVAC internal temperature mixing air door to completely pass through the condenser to supply heat to the interior of the vehicle; after passing through the condenser, the refrigerant enters the intermediate heat exchanger through the first three-way valve to be continuously condensed, the refrigerant is cooled again in the intermediate heat exchanger, the supercooling degree of the refrigerant is increased, the condenser and the intermediate heat exchanger are in series connection, the second two-way valve is closed, then the refrigerant is throttled through the second expansion valve, enters the heat exchanger outside the vehicle to absorb heat and evaporate, then enters the vapor-liquid separator through the first two-way valve (in an open state), and finally returns to the compressor to complete circulation.
The coolant flow condition of the coolant circulation system is specifically as follows: the cooling liquid enters the intermediate heat exchanger through the electronic water pump for heat exchange, is heated into liquid with higher temperature, then enters the second three-way valve through the PTC water heating electric heater (which is selectively opened or closed), then enters the battery cooling tail end for heating the battery pack, and then returns to the electronic water pump to finish circulation.
In the second mode, the heat of the refrigerant is transferred to the cooling liquid circulation through the intermediate heat exchanger while the space in the vehicle is heated, so that the battery is kept at the optimal working temperature.
When the circulation mode is in the third mode, the refrigerant flow condition of the refrigerant circulation system is specifically as follows: the refrigerant is compressed into high-temperature high-pressure steam by a compressor and enters a condenser, the condenser is a stable heat source at the moment, and the air flow is controlled by an HVAC internal temperature mixing air door to completely pass through the condenser to supply heat to the interior of the vehicle; after passing through the condenser, the refrigerant enters the intermediate heat exchanger through the first three-way valve to be continuously condensed, the refrigerant is cooled again in the intermediate heat exchanger, the supercooling degree of the refrigerant is increased, the condenser and the intermediate heat exchanger are in series connection, the second two-way valve is closed, then the refrigerant is throttled through the second expansion valve, enters the heat exchanger outside the vehicle to absorb heat and evaporate, then enters the vapor-liquid separator through the first two-way valve (in an open state), and finally returns to the compressor to complete circulation.
The coolant flow condition of the coolant circulation system is specifically as follows: the cooling liquid in the circulation is used as a heat storage material, and the heat in the refrigerant is stored in the cooling liquid through the intermediate heat exchanger. The cooling liquid enters the intermediate heat exchanger through the electronic water pump for heat exchange, is heated into liquid with higher temperature, then enters the second three-way valve through the PTC water heating electric heater (in a closed state), then enters the liquid storage tank, and then returns to the electronic water pump to complete circulation.
In the third mode, the heat of the refrigerant is transferred to the cooling liquid, and the heat is stored in advance, so that the circulation quantity of the refrigerant of the defrosting process system is ensured, and the external heat exchanger is effectively defrosted.
A computer-readable storage medium for storing a computer program which, when invoked by a processor, implements the defrosting control method of an electric vehicle heat pump air conditioner as set forth in any one of the above.
The utility model provides a pair of defrosting control device of electric automobile heat pump air conditioner's beneficial effect lies in: under the heating mode of the automobile air conditioner, the waste heat of the internal condenser can be stored by combining the existing cooling liquid system without adding other complex equipment, so that the supercooling degree of the refrigerant system is improved, and the heat can be stored to be convenient for utilization during defrosting; the heat of the system is comprehensively utilized at low temperature, the circulating quantity of the system refrigerant in the defrosting process is ensured by utilizing the waste heat of the cooling liquid and the scheme of PTC auxiliary heating, the heat exchanger outside the vehicle is effectively defrosted, the low-temperature refrigerant in the heat pump defrosting process does not need to pass through HVAC, the comfort and the system reliability in the vehicle of the heat pump defrosting at low temperature can be ensured, the heat supply in the vehicle can be immediately recovered after the heat pump defrosting is finished, the defrosting time is short, the heat supply recovery time is short, and the temperature in the vehicle is not fluctuated.
Drawings
FIG. 1 is a schematic view of the flow direction of the refrigerant and the cooling liquid in embodiment 2 of the present invention;
FIG. 2 is a schematic view of the flow direction of the refrigerant and the coolant in embodiment 1 of the present invention;
FIG. 3 is a schematic view of the flow direction of the refrigerant and the coolant in embodiment 3 of the present invention;
fig. 4 is a schematic view of the flow direction of the refrigerant and the coolant in the defrosting mode according to embodiment 1 of the present invention.
In the figure: 10. a vapor-liquid separator; 11. a compressor; 12. a first three-way valve; 13. a first two-way valve; 14. an exterior heat exchanger; 15. an outer fan; 16. a first expansion valve; 17. a second expansion valve; 18. an intermediate heat exchanger; 19. a second two-way valve; 20. HVAC; 21. an inner fan; 22. an evaporator; 23. a mixing damper; 24. a condenser; 25. a first temperature sensor; 26. a second temperature sensor; 30. an electronic water pump; 31. a PTC water heating electric heater; 32. a second three-way valve; 33. a battery cooling end; 34. a liquid storage tank; 35. a third temperature sensor; the thin solid arrows indicate the refrigerant cycle; the open arrows indicate the coolant circulation.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by a person skilled in the art without any inventive step are within the scope of the present invention.
Example 1: a defrosting control method for a heat pump air conditioner of an electric automobile.
A defrosting control method of an electric vehicle heat pump air conditioner comprises the following specific steps:
firstly, judging an operation mode, when the operation mode is judged to be a heating mode, further judging whether a battery needs to be heated, and when the battery needs to be heated, specifically, the working condition of the refrigerant circulating system is as follows: the refrigerant is compressed into high-temperature high-pressure steam by a compressor 11 and enters a condenser 24, the condenser 24 is a stable heat source, and the air flow is controlled by an internal temperature mixing damper 23 of the HVAC20 to completely pass through the condenser 24 to supply heat to the interior of the vehicle; after passing through the condenser 24, the refrigerant enters the intermediate heat exchanger 18 through the first three-way valve 12 to be continuously condensed, the refrigerant is cooled again in the intermediate heat exchanger 18, the supercooling degree of the refrigerant is increased, the condenser 24 and the intermediate heat exchanger 18 are in a series connection relationship, the second two-way valve 19 is closed, then the refrigerant is throttled through the second expansion valve 17, enters the external heat exchanger 14 for heat absorption and evaporation, then enters the vapor-liquid separator 10 through the first two-way valve 13 (in an open state), and finally returns to the compressor 11 to complete circulation.
The working conditions of the cooling liquid circulating system are as follows: the cooling liquid enters the intermediate heat exchanger 18 for heat exchange through the electronic water pump 30, is heated to be a liquid with a higher temperature, then enters the second three-way valve 32 through the PTC water heating electric heater 31 (which is selectively opened or closed), then enters the battery cooling end 33 to heat the battery pack, and then returns to the electronic water pump 30 to complete circulation.
Then, judging whether to enter a defrosting mode, specifically judging whether the outer ring temperature T is less than a certain temperature a DEG C: if the T outer ring is more than or equal to a ℃, judging the defrosting condition; and if the T outer ring is less than a ℃, entering the continuous operation time of the compressor in the heating mode: if the running time H is less than H minutes, judging the defrosting condition, and if the running time H is more than or equal to H minutes, judging the defrosting condition; partitioning the temperature of the outer ring: the temperature of the T outer pipe is judged in each temperature interval, the T outer ring is more than or equal to b ℃, the T outer ring is more than or equal to c ℃, the T outer ring is more than d ℃, the temperature of the T outer pipe is respectively judged, the T outer pipe corresponds to the temperature interval, and the judgment conditions are as follows: the temperature of the T outer pipe is less than or equal to T outer ring-m ℃, the temperature of the T outer pipe is less than or equal to T outer ring-n ℃, the temperature of the T outer pipe is less than or equal to T outer ring-p ℃, and the temperature of the T outer pipe is less than or equal to T outer ring-q ℃, and meanwhile, the time limitation is realized, the defrosting operation mode can be entered only when the judgment condition is continuously detected for 3min and meets the requirement, and the defrosting operation.
The defrosting operation mode specifically comprises the following steps: the compressor 11, the external fan 15 and the electronic water pump 30 are powered off and stopped, and the second expansion valve 17 is turned to the defrosting opening degree; the first expansion valve 16 is turned to the fully closed state; the inner fan 21 in the HVAC20 is turned to minimum windshield operation; the HVAC20 blend door 23 is turned to full cool mode; the HVAC20 air-out mode is changed to the foot-blowing mode, and the related actions of the HVAC20 are all used for reducing the cold feeling of blowing in the vehicle;
after 20 seconds, the following procedure was followed: the first two-way valve 13 is switched to the off state; the second two-way valve 19 is switched to the on state; the first three-way valve 12 is switched to the cooling mode; the coolant system second three-way valve 31 keeps A-B on; the 20-second interval is used for balancing the high pressure and the low pressure of the system after the compressor is stopped, so that the noise of refrigerant impact can not occur after the refrigerant is reversed;
after 5 seconds, the next step is carried out: starting the compressor 11 and running to defrosting frequency; starting the electronic water pump 30; starting defrosting;
in the defrosting process, the water temperature T (the temperature detected by the third temperature sensor 35) is detected at any time, and the water temperature is divided into three stages: the water temperature T is more than or equal to x ℃, the water temperature Y is more than or equal to T, the water temperature T is less than x ℃, and the water temperature T is less than y ℃; three different processing methods are simultaneously corresponded:
when the temperature of water T is more than or equal to x ℃, the second expansion valve 17 keeps the opening degree of 1; the temperature of the cooling liquid is the highest at this moment, and the stored heat can support enough refrigerant at most for evaporation, so the opening 1 of the second expansion valve is set to the maximum value, the circulation volume of the system is maximized, and the maximum heat is needed when the frost layer is the thickest at the initial stage of defrosting; therefore, the opening degree of the second expansion valve is adjusted to match the energy requirement of the defrosting initial stage with the flow of the system refrigerant, so as to achieve the fastest defrosting effect;
when the temperature T is more than or equal to y ℃ and the water temperature is less than x ℃, the second expansion valve 17 keeps the opening degree 2; as the defrosting process continues, the heat stored in the cooling liquid is continuously consumed, the temperature of the cooling liquid is reduced, the heat which can be provided for the refrigerant to evaporate is reduced, so the flow of the refrigerant of the system is also correspondingly reduced, therefore, the opening 2 of the second expansion valve is set to be a certain value which is smaller than the opening 1, the frost layer is reduced in the stage, and the whole defrosting process can be met without too much refrigerant participating in the circulation;
generally, a relatively thin or medium-thickness frost layer can meet the defrosting requirement through the two stages; if the frost layer is thick, the heat stored in the cooling liquid is continuously consumed, and the temperature of the cooling liquid is reduced to enter the next stage;
when the temperature T is less than y ℃, entering the next stage, wherein the heat in the cooling liquid system is not enough to support the defrosting evaporation process, forcibly starting the PTC water-heating electric heater 31, heating the cooling liquid by electric heating, and transmitting the heating liquid to the refrigerant to maintain the defrosting process until defrosting is finished;
the method comprises the steps that a T outer pipe (a detection value of a first temperature sensor 25) is always detected in the defrosting process, if the T outer pipe is detected to be more than or equal to w ℃ continuously for k seconds, the defrosting of the heat exchanger outside the vehicle is finished, the defrosting process can be quitted, the next step is carried out, the frequency of a compressor 11 is directly adjusted to the target frequency, an outer fan 15, an electronic water pump 30, a first two-way valve, a second two-way valve, a first three-way valve and a second three-way valve are all restored to conventional control, and an inner fan 21, a mixing air door 23, an air outlet mode and the like in the; so far, the whole defrosting process is finished.
Example 2: a defrosting control method for a heat pump air conditioner of an electric automobile.
The difference from embodiment 1 is that the operation mode is determined as the cooling mode, and the working condition of the refrigerant cycle system specifically includes: the refrigerant is compressed into high-temperature high-pressure steam by the compressor 11 and enters the condenser 24, the condenser 24 is a stable heat source at the moment, and the air flow is controlled by the HVAC20 internal temperature mixing damper 23 to pass through, not pass through or partially pass through the condenser 24 to form different air outlet temperatures, so that the temperature in the vehicle is regulated; after passing through the condenser 24, the refrigerant enters the exterior heat exchanger 14 through the first three-way valve 12 to be condensed, and then the refrigerant is branched: a part of the refrigerant is throttled by the first expansion valve 16 and then enters the evaporator 22 to be evaporated and absorb heat; the other part of the refrigerant is throttled by a second expansion valve 17, enters an intermediate heat exchanger 18 to be evaporated and absorb heat, then passes through a second two-way valve 19 and is combined with the refrigerant passing through an evaporator 22, and then enters a vapor-liquid separator 10 and finally returns to a compressor 11 to complete the circulation;
the working conditions of the cooling liquid circulating system are as follows: the cooling liquid enters the intermediate heat exchanger 18 through the electronic water pump 30 for heat exchange, is cooled into liquid with lower temperature, then enters the second three-way valve 32 through the PTC water heating electric heater 31 (not working at this time), then enters the battery cooling tail end 33 to take away the heat emitted by the battery pack, and then returns to the electronic water pump 30 to complete circulation.
Example 3: a defrosting control method for a heat pump air conditioner of an electric automobile.
The difference from the embodiment 1 is that when the battery is judged not to have the heating requirement, the T water temperature and the T internal cooling output (the detection value of the second temperature sensor 26) need to be judged, and when the T water temperature is more than the T internal cooling output, the refrigerant temperature does not meet the condition of heating the cooling liquid, and the current operation state is maintained; when the water temperature T is less than or equal to the temperature T and the internal cooling is out, the next step is carried out to carry out the related operation of heat storage operation if the heat storage operation condition is met, and the working condition of the refrigerant circulating system is as follows: the refrigerant is compressed into high-temperature high-pressure steam by a compressor 11 and enters a condenser 24, the condenser 24 is a stable heat source, and the air flow is controlled by an internal temperature mixing damper 23 of the HVAC20 to completely pass through the condenser 24 to supply heat to the interior of the vehicle; after passing through the condenser 24, the refrigerant enters the intermediate heat exchanger 18 through the first three-way valve 12 to be continuously condensed, the refrigerant is cooled again in the intermediate heat exchanger 18, the supercooling degree of the refrigerant is increased, the condenser 24 and the intermediate heat exchanger 18 are in a series connection relationship, the second two-way valve 19 is closed, then the refrigerant is throttled through the second expansion valve 17, enters the external heat exchanger 14 for heat absorption and evaporation, then enters the vapor-liquid separator 10 through the first two-way valve 13 (in an open state), and finally returns to the compressor 11 to complete circulation.
The working conditions of the cooling liquid circulating system are as follows: the coolant in this cycle acts as a heat storage material, storing heat in the coolant through the intermediate heat exchanger 18. The cooling liquid enters the intermediate heat exchanger 18 through the electronic water pump 30 for heat exchange, is heated into a liquid with a higher temperature, then enters the second three-way valve 32 through the PTC water heating electric heater 31 (in a closed state), then enters the liquid storage tank 34, and then returns to the electronic water pump 30 to complete circulation.
Example 4: a defrosting control device of an electric automobile heat pump air conditioner.
A defrosting control device of an electric automobile heat pump air conditioner is characterized in that a refrigerant circulating system comprises a vapor-liquid separator 10, a compressor 11, a first three-way valve 12, a first two-way valve 13, an outer heat exchanger 14, an outer fan 15, a first expansion valve 16, a second expansion valve 17, a second two-way valve 19, an HVAC20, a first temperature sensor 25 and a second temperature sensor 26, the HVAC20 comprises an inner fan 21, an evaporator 22, a mixing damper 23 and a condenser 24, an outlet end of the compressor 11 is connected with an inlet end of a condenser 24, an outlet end of the condenser 24 is connected with an inlet end of the outer heat exchanger 14 through the first three-way valve 12, an outlet end of the outer heat exchanger 14 is connected with an inlet end of an intermediate heat exchanger 18 through the second expansion valve 17, an outlet end of the outer heat exchanger 14 is further connected with the inlet end of the evaporator 22 through the first, the utility model discloses a heat exchanger, including middle heat exchanger 14, compressor 11, first temperature sensor 25, second temperature sensor 26, outer fan 15, interior fan 21, mixed air door 23 sets up between evaporator 22 and condenser 24, middle heat exchanger 14 exit end still is connected to vapour and liquid separator 10 entry end through second two-way valve 19, 11 entry ends of compressor are connected to vapour and liquid separator 10 exit end, vapour and liquid separator 10 entry end connects to the parallelly connected 14 entry ends of outer heat exchanger of car through first two-way valve 13, evaporator 22 exit end connects to the parallelly connected entry end of vapour and liquid separator 10, first temperature sensor 25 sets up in the outer heat exchanger 14 exit end of car, second temperature sensor 26 sets up in middle heat exchanger 18 exit.
The coolant liquid circulation system includes electronic water pump 30, PTC hot-water heating electric heater 31, second three-way valve 32, battery cooling end 33, liquid storage pot 34 and third temperature sensor 35, heat exchanger 18 entry end in the middle of electronic water pump 30 exit end connection, heat exchanger 18 exit end connection PTC hot-water heating electric heater 31 entry end in the middle of, PTC hot-water heating electric heater 31 exit end is connected to liquid storage pot 34 and battery cooling end 33 entry end respectively through second three-way valve 32, liquid storage pot 34 and battery cooling end 33 exit end connect in parallel to electronic water pump 30 entry end, third temperature sensor 35 sets up in heat exchanger 18 exit end in the middle.
The above description is a preferred embodiment of the present invention, but the present invention should not be limited to the disclosure of the embodiment and the accompanying drawings, and therefore, all equivalents and modifications that can be accomplished without departing from the spirit of the present invention are within the protection scope of the present invention.
Claims (3)
1. The defrosting control device of the heat pump air conditioner of the electric automobile is characterized by comprising a refrigerant circulating system, a cooling liquid circulating system and an intermediate heat exchanger, wherein the refrigerant circulating system is communicated with the cooling liquid circulating system through the intermediate heat exchanger, the refrigerant circulating system realizes the flowing of refrigerant in different directions, and the cooling liquid circulating system realizes the flowing of cooling liquid in different directions.
2. The defrosting control device of the heat pump air conditioner of the electric vehicle as claimed in claim 1, wherein: the refrigerant circulating system comprises a vapor-liquid separator, a compressor, a first three-way valve, a first two-way valve, an external heat exchanger, an external fan, a first expansion valve, a second two-way valve, an HVAC, a first temperature sensor and a second temperature sensor, wherein the HVAC comprises an internal fan, an evaporator, a mixing air door and a condenser, the outlet end of the compressor is connected with the inlet end of the condenser, the outlet end of the condenser is connected with the inlet end of the external heat exchanger through the first three-way valve, the outlet end of the external heat exchanger is connected with the inlet end of an intermediate heat exchanger through the second expansion valve, the outlet end of the external heat exchanger is also connected with the inlet end of the evaporator through the first expansion valve, the outlet end of the intermediate heat exchanger is connected to the inlet end of the external heat, the vapor-liquid separator entry end is parallelly connected to the outer heat exchanger entry end through first two-way valve, the evaporimeter exit end is parallelly connected to the vapor-liquid separator entry end, first temperature sensor sets up in the outer heat exchanger exit end of car, second temperature sensor sets up in middle heat exchanger exit end, outer fan sets up in outer heat exchanger one side, interior fan sets up in evaporimeter one side, the air mixing door sets up between evaporimeter and condenser.
3. The defrosting control device of the heat pump air conditioner of the electric vehicle as claimed in claim 1, wherein: the cooling liquid circulation system comprises an electronic water pump, a PTC water heating electric heater, a second three-way valve, a battery cooling end, a liquid storage tank and a third temperature sensor, wherein the outlet end of the electronic water pump is connected with the inlet end of an intermediate heat exchanger, the outlet end of the intermediate heat exchanger is connected with the inlet end of the PTC water heating electric heater, the outlet end of the PTC water heating electric heater is connected to the inlet end of the liquid storage tank and the inlet end of the battery cooling end through the second three-way valve respectively, the outlet ends of the liquid storage tank and the battery cooling end are connected to the inlet end of the electronic.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921470214.XU CN211567595U (en) | 2019-09-05 | 2019-09-05 | Defrosting control device of electric automobile heat pump air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921470214.XU CN211567595U (en) | 2019-09-05 | 2019-09-05 | Defrosting control device of electric automobile heat pump air conditioner |
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| CN211567595U true CN211567595U (en) | 2020-09-25 |
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| CN201921470214.XU Active CN211567595U (en) | 2019-09-05 | 2019-09-05 | Defrosting control device of electric automobile heat pump air conditioner |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110641242A (en) * | 2019-09-05 | 2020-01-03 | 珠海格力电器股份有限公司 | Defrosting control method and device for heat pump air conditioner of electric vehicle and computer readable storage medium |
| US20220252326A1 (en) * | 2021-02-08 | 2022-08-11 | A. O. Smith (China) Water Heater Co., Ltd. | Defrosting control method, central controller and heating system |
| US11982487B2 (en) * | 2021-02-08 | 2024-05-14 | A.O. Smith Corporation | Defrosting control method, central controller and heating system |
-
2019
- 2019-09-05 CN CN201921470214.XU patent/CN211567595U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110641242A (en) * | 2019-09-05 | 2020-01-03 | 珠海格力电器股份有限公司 | Defrosting control method and device for heat pump air conditioner of electric vehicle and computer readable storage medium |
| CN110641242B (en) * | 2019-09-05 | 2024-04-19 | 珠海格力电器股份有限公司 | Defrosting control method and device for heat pump air conditioner of electric automobile and computer readable storage medium |
| US20220252326A1 (en) * | 2021-02-08 | 2022-08-11 | A. O. Smith (China) Water Heater Co., Ltd. | Defrosting control method, central controller and heating system |
| US11982487B2 (en) * | 2021-02-08 | 2024-05-14 | A.O. Smith Corporation | Defrosting control method, central controller and heating system |
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