CN114889402A - Air conditioning system and control method - Google Patents
Air conditioning system and control method Download PDFInfo
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- CN114889402A CN114889402A CN202210607750.XA CN202210607750A CN114889402A CN 114889402 A CN114889402 A CN 114889402A CN 202210607750 A CN202210607750 A CN 202210607750A CN 114889402 A CN114889402 A CN 114889402A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00007—Combined heating, ventilating, or cooling devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00357—Air-conditioning arrangements specially adapted for particular vehicles
- B60H1/00385—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00485—Valves for air-conditioning devices, e.g. thermostatic valves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00507—Details, e.g. mounting arrangements, desaeration devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/32—Cooling devices
- B60H1/3204—Cooling devices using compression
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
The air conditioning system comprises a compressor, wherein an outlet of the compressor is connected with a first port of a four-way valve through a pipeline, a second port of the four-way valve is connected with an inlet of an in-vehicle heat exchanger through a pipeline, an outlet of the in-vehicle heat exchanger is sequentially connected with a two-way drying filter, a main-path expansion valve and a two-way filter through pipelines, an outlet of the two-way filter is divided into two paths, one path of the two-way filter is connected with an inlet of an out-vehicle heat exchanger through a pipeline, the other path of the two-way filter is connected with an inlet of a bypass branch, an outlet of the bypass branch is connected with the first port of the four-way valve, a two-way valve is arranged on the bypass branch, an outlet of the out-vehicle heat exchanger is connected with a third port of the four-way valve, a fourth port of the four-way valve is connected with an inlet of a gas-liquid separator through a pipeline, and an outlet of the gas-liquid separator is connected with an air suction port of the compressor. The invention can realize the quick defrosting of the system under the conditions that the compressor is not stopped and the four-way valve is not reversed, has no refrigerant scouring noise generated during high-low pressure balance, and can not blow cold air to the indoor by the heat exchanger in the vehicle during defrosting.
Description
Technical Field
The invention relates to the technical field of heat pump air conditioners, in particular to an air conditioning system and a control method.
Background
With the development of national economic strength and the change of international status, the construction of an environment-friendly society, the realization of carbon peak reaching before 2030 years and the realization of carbon neutralization in 2060 years are the commitments of the Chinese government to the world. The automotive industry, as a key to controlling carbon emissions, is an inevitable turn towards new energy. However, unlike the conventional vehicle, the new energy automobile has no engine hot water available during heating in winter, and a heat pump air conditioner or an electric heater is required to meet the requirement of heating in the automobile. The development and application of the heat pump air conditioner in the automobile industry have been about 10 years, and as the heat exchanger outside the automobile plays the role of an evaporator and absorbs heat from the environment outside the automobile when the heat pump air conditioner is in operation, the surface temperature of the heat pump air conditioner is obviously lower than the environmental temperature, and when the surface temperature of the heat pump air conditioner is lower than 0 ℃, water vapor in the environment is condensed to frost on the surface of the heat pump air conditioner. The frosting of the core in the environment outside the vehicle can influence the air conditioner to absorb heat from the environment and reduce the heating quantity, can also cause the evaporation temperature to be continuously reduced and influence the oil return of the system, and can also cause the suction superheat degree of the compressor to be reduced and influence the stable operation of the compressor. Therefore, how to defrost quickly is always a difficult and hot spot in the industry.
The refrigerant circulating system under the common refrigerating working condition of the existing passenger car air conditioner is designed to be a compressor, an external heat exchanger, an expansion valve, an internal heat exchanger and the compressor, the refrigerant circulating directions under the heating working condition are opposite, and the change of the refrigerant flow direction is carried out by depending on a four-way reversing valve. Wherein, the heat exchanger outside the vehicle absorbs heat from the outside of the vehicle during heating and frosts when the surface temperature is lower than 0 ℃. The existing system scheme needs to change the four-way reversing valve when defrosting, so that the heat exchanger outside the vehicle is changed to the high-pressure end of the system, and the high-temperature high-pressure steam at the outlet of the compressor is used for defrosting the surface of the core body.
Because the four-way valve needs to overcome the pressure difference of the high-low pressure side for reversing during reversing, and because the power of the corresponding coil of the valve body is fixed, the maximum pressure difference which can be overcome is also fixed, most manufacturers can firstly shut down the compressor when realizing the reversing function of the four-way valve, and then reverse the four-way valve after the pressure of the high-low pressure end is balanced. Of course, some manufacturers adopt a mode of greatly increasing the rotation speed of the compressor without stopping the compressor, reduce the pressure difference of the high-pressure end and the low-pressure end, and directly change the direction of the four-way valve. However, when the direction is changed, the pressure balance of the system is carried out by the communication pipeline in the four-way valve, the original high-pressure end gas quickly moves to the original low-pressure end, and the high-pressure gas easily causes airflow squeaking, so that the use feeling is seriously influenced.
And the four-way valve is used for reversing, so that the original heating cycle is changed into a refrigerating cycle, the function of the heat exchanger in the automobile is changed into an evaporator, heat can be absorbed from the inside of the automobile, and cold air can be blown into the automobile at the moment, so that the comfort and the temperature stability in the automobile are influenced. In order to compensate heat, an electric heater is required to be added between the heat exchanger and the fan in the vehicle to heat cold air. The additional use of the electric heater can consume a large amount of vehicle-mounted energy, and the endurance mileage of the vehicle is influenced.
Disclosure of Invention
In order to solve the problems, an air conditioning system and a control method are provided.
The object of the invention is achieved in the following way:
an air conditioning system comprises a compressor 1, a four-way valve 7, an in-vehicle heat exchanger 2, a two-way drying filter 3, an out-vehicle heat exchanger 6 and a gas-liquid separator 8, wherein the outlet of the compressor 1 is connected with a first port of the four-way valve 7 through a pipeline, a second port of the four-way valve 7 is connected with the inlet of the in-vehicle heat exchanger 2 through a pipeline, the outlet of the in-vehicle heat exchanger 2 is sequentially connected with the two-way drying filter 3, a main-path expansion valve 4 and the two-way filter 5 through pipelines, the outlet of the two-way filter 5 is divided into two paths, one path is connected with the inlet of the out-vehicle heat exchanger 6 through a pipeline, the other path is connected with the inlet of a bypass branch, the outlet of the bypass branch is connected with the first port of the four-way valve 7, the outlet of the out-vehicle heat exchanger 6 is connected with a third port of the four-way valve 7, and the fourth port of the four-way valve 7 is connected with the inlet of the gas-liquid separator 8 through a pipeline, the exit linkage compressor 1's of vapour and liquid separator 8 induction port, set up exhaust temperature sensor 17 on the pipeline between the export of compressor 1 and the first port of cross valve 7, the heat exchanger 2 air-out side sets up return air temperature sensor 13 in the car, the air-out side of heat exchanger 6 outside sets up outdoor temperature sensor 12, set up defrosting sensor 14 on the import pipeline of heat exchanger 6 outside the car.
An evaporation fan 9 and an electric heater 10 are arranged on the outer side of the heat exchanger 2 inside the vehicle, and a condensation fan 18 is arranged on the outer side of the heat exchanger 6 outside the vehicle.
A low-pressure filling valve 20 is arranged on a pipeline between the inlet of the gas-liquid separator 8 and the fourth port of the four-way valve 7, a low-pressure switch 16 is arranged on a pipeline between the outlet of the gas-liquid separator 8 and the suction port of the compressor 1, and a high-pressure filling valve 19 and a high-pressure switch 15 are sequentially arranged on a pipeline between the outlet of the compressor 1 and the first port of the four-way valve 7.
A control method of an air conditioning system comprises the steps that in a heating mode, a high-temperature and high-pressure refrigerant is communicated to an inlet of a heat exchanger in a vehicle from an outlet of a compressor through a four-way valve, the refrigerant is cooled to be a medium-temperature and medium-pressure supercooled liquid refrigerant after being radiated to the interior of the vehicle through the heat exchanger in the vehicle and an evaporation fan, the medium-temperature and medium-pressure refrigerant is changed into a low-temperature and low-pressure saturated refrigerant after passing through a main path expansion valve, the saturated refrigerant is communicated to a heat exchanger outside the vehicle, the heat is absorbed from the environment outside the vehicle through the heat exchanger outside the vehicle and the condensation fan, the saturated refrigerant is evaporated to be low-temperature and low-pressure superheated steam, and the superheated steam returns to the compressor through a gas-liquid separator; when in the heating mode, the controller controls the compressor and the expansion valve to automatically adjust according to the received data of the exhaust temperature sensor, the return air temperature sensor and the outdoor temperature sensor and the temperature set by the panel, judges whether a defrosting condition is met or not, and enters the defrosting mode if the defrosting condition is met and opens the two-way valve.
The air conditioning system judges whether the feedback temperature T5 of the defrosting temperature sensor and the continuous operation time T1 after the air conditioner is started reach a defrosting condition, if the feedback temperature T5 of the defrosting temperature sensor and the continuous operation time T1 reach the defrosting condition, the two-way valve is opened, and whether the outdoor environment temperature measured by the outdoor temperature sensor is higher than the preset defrosting mode judgment temperature is judged; if the temperature is higher than the preset reference temperature, the rotating speed of the compressor is controlled to be increased to a preset calibration rotating speed, the rotating speed of the condensing fan is reduced to a preset defrosting rotating speed, the rotating speed of the evaporating fan is reduced to the rotating speed of the fan during reversing defrosting, and when the feedback temperature of the defrosting temperature sensor and the defrosting time reach a defrosting mode exit condition, the two-way valve is closed; if the temperature is not higher than the preset reference temperature, the rotating speed of the compressor is controlled to be increased to a preset calibration rotating speed, the rotating speed of the condensing fan is reduced to a preset defrosting rotating speed, the rotating speed of the evaporating fan is reduced to the rotating speed of the fan during reversing defrosting, the electric heater is started, and when the feedback temperature of the defrosting temperature sensor and the defrosting time reach a defrosting mode exit condition, the two-way valve is closed, and the defrosting mode exits.
The invention has the beneficial effects that: the invention can realize the quick defrosting of the system under the conditions that the compressor is not stopped and the four-way valve is not reversed, has no refrigerant scouring noise generated during high-low pressure balance, and can not blow cold air to the indoor by the heat exchanger in the vehicle during defrosting. The number of times of defrosting can be reduced, the use of electric heating during defrosting can be reduced, and the cruising mileage of the whole vehicle is improved. When the environment temperature is higher, an auxiliary heat source is not needed to be additionally used, and when the environment temperature is lower, the defrosting process is caused, the interior of the vehicle can be heated, so that the needed auxiliary heat source is less, and the energy consumption of the whole vehicle is lower.
Drawings
Fig. 1 is a schematic diagram of an air conditioning system of the present invention.
Fig. 2 is a flow chart of the present invention.
The system comprises a compressor 1, an in-vehicle heat exchanger 2, a bidirectional drying filter 3, a main path expansion valve 4, a bidirectional filter 5, an out-vehicle heat exchanger 6, a four-way valve 7, a gas-liquid separator 8, an evaporation fan 9, an electric heater 10, a two-way valve 11, an outdoor temperature sensor 12, an air return temperature sensor 13, a defrosting sensor 14, a high-pressure switch 15, a low-pressure switch 16, an exhaust temperature sensor 17, a condensing fan 18, a high-pressure filling valve 19 and a low-pressure filling valve 20.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same technical meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
An air conditioning system comprises a compressor 1, a four-way valve 7, an in-vehicle heat exchanger 2, a two-way drying filter 3, an out-vehicle heat exchanger 6, a gas-liquid separator 8 and a controller, wherein the outlet of the compressor 1 is connected with a first port of the four-way valve 7 through a pipeline, a second port of the four-way valve 7 is connected with the inlet of the in-vehicle heat exchanger 2 through a pipeline, the outlet of the in-vehicle heat exchanger 2 is sequentially connected with the two-way drying filter 3, a main path expansion valve 4 and the two-way filter 5 through pipelines, the outlet of the two-way filter 5 is divided into two paths, one path is connected with the inlet of the out-vehicle heat exchanger 6 through a pipeline, the other path is connected with the inlet of a bypass branch, the outlet of the bypass branch is connected with the first port of the four-way valve 7, the outlet of the out-vehicle heat exchanger 6 is connected with a third port of the four-way valve 7, and the fourth port of the four-way valve 7 is connected with the inlet of the gas-liquid separator 8 through a pipeline, the exit linkage compressor 1's of vapour and liquid separator 8 induction port, set up exhaust temperature sensor 17 on the pipeline between the export of compressor 1 and the first port of cross valve 7, the heat exchanger 2 air-out side sets up return air temperature sensor 13 in the car, the air-out side of heat exchanger 6 outside sets up outdoor temperature sensor 12, set up defrosting sensor 14 on the import pipeline of heat exchanger 6 outside the car.
An evaporation fan 9 and an electric heater 10 are arranged on the outer side of the heat exchanger 2 inside the vehicle, and a condensation fan 18 is arranged on the outer side of the heat exchanger 6 outside the vehicle.
A low-pressure filling valve 20 is arranged on a pipeline between the inlet of the gas-liquid separator 8 and the fourth port of the four-way valve 7, a low-pressure switch 16 is arranged on a pipeline between the outlet of the gas-liquid separator 8 and the suction port of the compressor 1, and a high-pressure filling valve 19 and a high-pressure switch 15 are sequentially arranged on a pipeline between the outlet of the compressor 1 and the first port of the four-way valve 7.
A control method of an air conditioning system comprises the steps that in a heating mode, a high-temperature and high-pressure refrigerant is communicated to an inlet of a heat exchanger in a vehicle from an outlet of a compressor through a four-way valve, the refrigerant is cooled to be a medium-temperature and medium-pressure supercooled liquid refrigerant after being radiated to the interior of the vehicle through the heat exchanger in the vehicle and an evaporation fan, the medium-temperature and medium-pressure refrigerant is changed into a low-temperature and low-pressure saturated refrigerant after passing through a main path expansion valve, the saturated refrigerant is communicated to a heat exchanger outside the vehicle, the heat is absorbed from the environment outside the vehicle through the heat exchanger outside the vehicle and the condensation fan, the saturated refrigerant is evaporated to be low-temperature and low-pressure superheated steam, and the superheated steam returns to the compressor through a gas-liquid separator; when in the heating mode, the controller controls the compressor and the expansion valve to automatically adjust according to the received data of the exhaust temperature sensor, the return air temperature sensor and the outdoor temperature sensor and the temperature set by the panel, judges whether a defrosting condition is met or not, and enters the defrosting mode if the defrosting condition is met and opens the two-way valve.
The air conditioning system judges whether the feedback temperature T5 of the defrosting temperature sensor and the continuous operation time T1 after the air conditioner is started reach a defrosting condition, if the feedback temperature T5 of the defrosting temperature sensor and the continuous operation time T1 reach the defrosting condition, the two-way valve is opened, and whether the outdoor environment temperature measured by the outdoor environment temperature sensor is higher than a preset defrosting mode judgment temperature is judged; if the temperature is higher than the preset reference value, the capacity margin of the heat pump air-conditioning system is larger, in order to ensure comfortable air outlet temperature t7, the rotating speed of the compressor is controlled to be increased to a preset calibration rotating speed, the rotating speed of the condensing fan is reduced to a preset defrosting rotating speed, the rotating speed of the evaporating fan is reduced to a fan rotating speed R33 during reversing defrosting, and when the feedback temperature of the defrosting temperature sensor and defrosting time reach a defrosting mode exit condition, the two-way valve is closed; if the temperature is not higher than the preset reference temperature, the capacity margin of the heat pump air conditioning system is small, in order to ensure comfortable air outlet temperature t7, the rotating speed of the compressor is controlled to be increased to a preset calibration rotating speed, the rotating speed of the condensing fan R2 is reduced to a preset defrosting rotating speed R22, the rotating speed of the evaporating fan is reduced to a fan rotating speed R33 when the direction is changed and defrosting is carried out, the output power W1 of the electric heater is controlled according to the change of the air outlet temperature t7, and when the feedback temperature of the defrosting temperature sensor and the defrosting time reach a defrosting mode exit condition, the two-way valve is closed.
As shown in fig. 1, the heat pump air conditioner is in a heating mode. At this time, the two-way valve 11 is in the closed state, and its branch is not closed.
The high-temperature and high-pressure refrigerant is led to the inlet of the heat exchanger 2 in the vehicle from the outlet of the compressor 1 through the four-way valve 7, and is condensed into a supercooled liquid refrigerant at medium temperature and medium pressure after being radiated to the interior of the vehicle through the heat exchanger 2 in the vehicle and the evaporation fan 9. The medium-temperature and medium-pressure refrigerant is changed into low-temperature and low-pressure saturated refrigerant after passing through the main path expansion valve 4, then the saturated refrigerant is led into the exterior heat exchanger 6, absorbs heat from the exterior environment through the exterior heat exchanger 6 and the condensing fan 18, is evaporated into low-temperature and low-pressure superheated steam, and then returns to the compressor 1 through the gas-liquid separator 8.
When the system identifies that defrosting is needed, the two-way valve 11 on the bypass branch is opened to introduce the high-temperature and high-pressure refrigerant into the external heat exchanger 6 from the outlet of the compressor 1 through the two-way valve 11, so that the surface temperature of the external heat exchanger 6 is increased, and defrosting is achieved. At this time, since the amount of the high-temperature refrigerant introduced into the interior heat exchanger 2 is reduced, the amount of heating of the system is reduced.
When the air conditioner is in the normal heating mode, the air conditioner performs control around the discharge temperature t1 detected by the discharge temperature sensor 17, the return air temperature t2 detected by the return air temperature sensor 13, the outdoor temperature t3 detected by the outdoor temperature sensor 12, and the set temperature t4 set by the panel, and the compressor 1 and the main expansion valve 4 perform automatic regulation.
With the continuation of the automatic control process, the system determines whether the feedback temperature T5 detected by the defrosting sensor and the continuous operation time T1 after the air conditioner is started reach a preset defrosting condition, and if the feedback temperature T5 and the continuous operation time T1 after the air conditioner is started, the two-way valve 11 is opened.
Since the air conditioner operates, its performance is related to the rotational speed of the compressor. When the ambient temperature is higher, the required heating capacity of the vehicle is not high, and the compressor is not required to operate at a high rotating speed. When the compressor speed is not changed, the hot gas bypass can cause the heating capacity to be reduced, so that when the system judges defrosting, two conditions exist:
1. if the outdoor temperature t3 measured by the outdoor temperature sensor is higher than the mode decision temperature t6 (where the mode decision temperature t6 is a temperature point indicating that the defrosting function is not stopped, the capacity margin of the heat pump air conditioning system is large. In order to ensure that the outlet air temperature t7 is comfortable (where t7 is temperature data measured by an outlet air temperature sensor disposed on the air outlet side of the vehicle interior heat exchanger), the rotation speed R1 of the compressor is increased to a preset calibration rotation speed R11. Similarly, at this time, the condensing fan rotation speed R2 is reduced to the preset defrosting rotation speed R22, and the evaporating fan rotation speed R3 is reduced to the fan rotation speed R33 during the reversing defrosting.
2. If the outdoor temperature t3 measured by the outdoor temperature sensor is less than the mode decision temperature t6, the capacity margin of the heat pump air conditioning system is small. In order to ensure comfortable outlet air temperature t7, the compressor rotation speed R1 is increased to the calibration rotation speed R11. Similarly, at this time, the rotating speed of the condensing fan is reduced from R2 to the defrosting rotating speed R22, and the rotating speed of the evaporating fan R3 is reduced to the rotating speed R33 during the reversing defrosting. However, at this time, since the compressor speed R1 is close to the nominal speed R11, that is, the capacity margin of the heat pump air conditioning system is small, the electric heater needs to be started for thermal compensation. The output power W1 of the electric heater is controlled according to the change of t7, i.e. W1 rises when t7 is lower than before defrosting, and W1 falls when t7 is higher than before defrosting.
3. When the value of T5 and the defrosting time T2 reach the defrosting mode exit condition, the bypass two-way valve 11 is closed. R1 restores the original control logic.
Additionally, because of the geographic nature of passenger car operation, the environment in which it travels is often fixed. Thus, when the minimum temperature of the vehicle operating climate is above t6, the heat pump air conditioning system may be used without the need for an additional matched electric heater.
The two-way valve in the application can adopt an electromagnetic valve, but other substitutes such as an electronic expansion valve, an energy regulating valve and the like are in a protection range.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the overall concept of the present invention, and these should also be considered as the protection scope of the present invention.
Claims (5)
1. An air conditioning system characterized by: the system comprises a compressor (1), a four-way valve (7), an in-vehicle heat exchanger (2), a two-way drying filter (3), an out-vehicle heat exchanger (6) and a gas-liquid separator (8), wherein the outlet of the compressor (1) is connected with a first port of the four-way valve (7) through a pipeline, a second port of the four-way valve (7) is connected with the inlet of the in-vehicle heat exchanger (2) through a pipeline, the outlet of the in-vehicle heat exchanger (2) is sequentially connected with the two-way drying filter (3), a main-path expansion valve (4) and the two-way filter (5) through pipelines, the outlet of the two-way filter (5) is divided into two paths, one path is connected with the inlet of the out-vehicle heat exchanger (6) through a pipeline, the other path is connected with the inlet of a bypass branch, the outlet of the bypass branch is connected with the first port of the four-way valve (7), the bypass branch is provided with the two-way valve (11), the outlet of the out-vehicle heat exchanger (6) is connected with a third port of the four-way valve (7), the fourth port of cross valve (7) passes through the import of tube coupling vapour and liquid separator (8), and the induction port of exit linkage compressor (1) of vapour and liquid separator (8), set up exhaust temperature sensor (17) on the pipeline between the export of compressor (1) and cross valve (7) first port, heat exchanger (2) air-out side sets up return air temperature sensor (13) in the car, the air-out side of outer heat exchanger (6) sets up outdoor temperature sensor (12), set up defrosting sensor (14) on the import pipeline of outer heat exchanger (6).
2. The air conditioning system of claim 1, wherein: an evaporation fan (9) and an electric heater (10) are arranged on the outer side of the heat exchanger (2) inside the vehicle, and a condensation fan (18) is arranged on the outer side of the heat exchanger (6) outside the vehicle.
3. The air conditioning system of claim 1, wherein: a low-pressure filling valve (20) is arranged on a pipeline between an inlet of the gas-liquid separator (8) and a fourth port of the four-way valve (7), a low-pressure switch (16) is arranged on a pipeline between an outlet of the gas-liquid separator (8) and an air suction port of the compressor (1), and a high-pressure filling valve (19) and a high-pressure switch (15) are sequentially arranged on a pipeline between an outlet of the compressor (1) and a first port of the four-way valve (7).
4. A control method of an air conditioning system according to any one of claims 1 to 3, characterized in that: in the heating mode, a high-temperature and high-pressure refrigerant is communicated to an inlet of a heat exchanger in the vehicle from an outlet of the compressor through a four-way valve, is cooled to the interior of the vehicle through the heat exchanger in the vehicle and an evaporation fan and then is condensed into a medium-temperature and medium-pressure supercooled liquid refrigerant, the medium-temperature and medium-pressure refrigerant becomes a low-temperature and low-pressure saturated refrigerant after passing through a main path expansion valve and then is communicated to a heat exchanger outside the vehicle, absorbs heat from the environment outside the vehicle through the heat exchanger outside the vehicle and the condensation fan, is evaporated into low-temperature and low-pressure superheated steam, and then is returned to the compressor through a gas-liquid separator; when in the heating mode, the controller controls the compressor and the expansion valve to automatically adjust according to the received data of the exhaust temperature sensor, the return air temperature sensor and the outdoor temperature sensor and the temperature set by the panel, judges whether a defrosting condition is met or not, and enters the defrosting mode if the defrosting condition is met and opens the two-way valve.
5. The control method of an air conditioning system according to claim 4, characterized in that: the air conditioning system judges whether the feedback temperature T5 of the defrosting temperature sensor and the continuous operation time T1 after the air conditioner is started reach a defrosting condition, if the feedback temperature T5 of the defrosting temperature sensor and the continuous operation time T1 reach the defrosting condition, the two-way valve is opened, and whether the outdoor environment temperature measured by the outdoor temperature sensor is higher than the preset defrosting mode judgment temperature is judged; if the temperature is higher than the preset reference temperature, the rotating speed of the compressor is controlled to be increased to a preset calibration rotating speed, the rotating speed of the condensing fan is reduced to a preset defrosting rotating speed, the rotating speed of the evaporating fan is reduced to the rotating speed of the fan during reversing defrosting, and when the feedback temperature of the defrosting temperature sensor and the defrosting time reach a defrosting mode exit condition, the two-way valve is closed; if the temperature is not higher than the preset reference temperature, the rotating speed of the compressor is controlled to be increased to a preset calibration rotating speed, the rotating speed of the condensing fan is reduced to a preset defrosting rotating speed, the rotating speed of the evaporating fan is reduced to the rotating speed of the fan during reversing defrosting, the electric heater is started, and when the feedback temperature of the defrosting temperature sensor and the defrosting time reach a defrosting mode exit condition, the two-way valve is closed, and the defrosting mode exits.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210607750.XA CN114889402A (en) | 2022-05-31 | 2022-05-31 | Air conditioning system and control method |
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| CN202210607750.XA CN114889402A (en) | 2022-05-31 | 2022-05-31 | Air conditioning system and control method |
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| CN114889402A true CN114889402A (en) | 2022-08-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115717787A (en) * | 2022-11-09 | 2023-02-28 | 珠海格力电器股份有限公司 | Air conditioner control method and device and air conditioner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115717787A (en) * | 2022-11-09 | 2023-02-28 | 珠海格力电器股份有限公司 | Air conditioner control method and device and air conditioner |
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