Six-way reversing valve, heat recovery automobile air conditioning system using same and control logic

Abstract

The invention discloses a six-way reversing valve, a heat recovery automobile air conditioning system using the six-way reversing valve and control logication.The six-way reversing valve comprises a valve body, and a low-temperature pipeline outlet, a low-temperature pipeline inlet, a high-temperature pipeline outlet and a high-temperature pipeline inlet are formed in one side of the valve body; a heat exchanger outlet which can be communicated with the low-temperature pipeline outlet or the high-temperature pipeline outlet is formed in the other side of the valve body, and a heat exchanger inlet which can be communicated with the low-temperature pipeline inlet or the high-temperature pipeline inlet is further formed in the other side of the valve body; the six-way reversing valve has the beneficial effects that the six-way reversing valve is controlled by the electromagnetic coil, and switching of three working modes can be achieved by changing the current state; according to the system, independent cooling or heat supply of each temperature adjusting branch can be realized without influencing each other, and heat management of the whole vehicle is realized; the control logic not only can satisfy the normal operation of the system, but also can operate in a special scene with low energy consumption. In addition, the control logic can be compatible with the automobile air conditioning system under different refrigerants and secondary refrigerants.

Description

Technical Field

[0001] The present invention relates to the field of vehicle refrigeration systems, and particularly to a six-way reversing valve, a heat recovery automotive air conditioning system using the valve, and a control logic. Background Art

[0002] With the increasingly serious global environmental problems and the transformation of the energy structure, electric vehicles, as a green and environmentally friendly means of transportation, have received extensive attention and development. The advantages of electric vehicles lie in their zero emissions, low noise, and relatively low operating costs. However, at the same time, since their power source mainly relies on batteries, the battery endurance problem has become one of the important factors affecting the popularization of electric vehicles. Against this background, the design of the air conditioning system for electric vehicles has gradually become a key technical issue. In particular, while ensuring the performance of the air conditioning system, how to effectively control its impact on battery endurance has become one of the core challenges in the current research and development of electric vehicle air conditioning systems.

[0003] Traditional automotive air conditioning systems usually adopt compression refrigeration or heat pump technology, and use engine power to drive the compressor for refrigeration or heating. However, electric vehicles do not rely on internal combustion engines but are powered by batteries, which makes the design of traditional air conditioning systems inapplicable directly. The air conditioning system for electric vehicles requires a more efficient and energy-saving design to ensure that while providing a comfortable in-vehicle environment for the owner, it minimizes the impact on battery endurance as much as possible.

[0004] Currently, the electric vehicle air conditioning systems on the market mainly have the following problems: First, the application of traditional air conditioning systems in electric vehicles often leads to a significant decrease in battery endurance, especially in high-temperature or cold environments, and the energy consumption of the air conditioner further exacerbates this problem; Second, the existing air conditioning systems are usually relatively complex, and their control logic is not intelligent enough to adjust the working state in real time according to the owner's needs and the external environment, resulting in difficulty in balancing the energy efficiency and comfort of the air conditioner; Finally, many electric vehicle air conditioning systems lack an effective heat recovery mechanism and fail to make full use of the heat generated during the battery charging and discharging process, which not only wastes energy but also affects the working efficiency and service life of the battery.

[0005] The patent with the publication number "CN105890226A" discloses "a water source combined cooling and heating cascade type cold and hot water unit and its control method". However, this design does not show how the heating and cooling are switched in the end-use cold scenario, and it cannot achieve the heat recovery mode, which does not meet the requirements of the current national policy of "energy conservation and emission reduction" and the construction of an energy-saving and environment-friendly society.

[0006] The applicant previously applied for a patent for "2024116431913, Six-way Directional Valve and Heat Recovery Automotive Air Conditioning System Using the Same", but in this patent document, the usage method and control logic of the air conditioning system were not described, resulting in inconvenience during use. In addition, the structure of the six-way directional valve in this patent can achieve balanced pipeline pressure compared to before, which is beneficial to the stable operation of the system. Summary of the Invention

[0007] The purpose of the present invention is to provide a six-way directional valve, a heat recovery automotive air conditioning system using this valve, and control logic. The six-way directional valve is controlled by an electromagnetic coil and can achieve rapid switching between refrigeration and heating by changing the current state of the energized electromagnetic coil. The heat recovery automotive air conditioning system simplifies and integrates the structure on the refrigerant side, and conveys heat and cold to each cold (heat) using area in the vehicle through a secondary circuit system to achieve coordinated management of the cold (heat) using areas throughout the vehicle. Moreover, each cold (heat) using area is independent, and heating and cooling in different cold (heat) using areas do not affect each other. The control logic of the heat recovery automotive air conditioning system can achieve the stable operation of the system, and the control logic in special scenarios can further improve the system performance. Especially when there are both heating and cooling requirements in the cold (heat) using areas, this system can also achieve the heat recovery function, thereby reducing the energy consumption of the whole vehicle and improving the system performance.

[0008] To achieve the above purpose, the present invention adopts the following technical solutions:

[0009] A six-way directional valve, including a valve body. On one side of the valve body, there are a low-temperature pipeline outlet, a low-temperature pipeline inlet, a high-temperature pipeline outlet, and a high-temperature pipeline inlet. On the other side of the valve body, there is a heat exchanger outlet that can be connected to the low-temperature pipeline outlet or the high-temperature pipeline outlet, and there is also a heat exchanger inlet that can be connected to the low-temperature pipeline inlet or the high-temperature pipeline inlet.

[0010] A slider is arranged inside the valve body.

[0011] Preferably, an electromagnetic coil is arranged at the end of the valve body, and a magnet that is attracted or repelled by the energized electromagnetic coil is arranged inside the slider.

[0012] Preferably, an iron hoop that can attract the magnet is arranged on the side wall of the valve body.

[0013] Preferably, the present application also provides a heat recovery automotive air conditioning system, including a balance tank, a cold and heat source assembly, a power assembly, at least one differential release branch located outside the vehicle, and at least one temperature control branch located inside the vehicle. The differential release branch and / or the temperature control branch use the aforementioned six-way directional valve.

[0014] Preferably, the cold and heat source assembly includes a compressor, a condenser, a liquid storage dryer, an expansion valve, and an evaporator, and the power assembly includes a low-temperature pipeline circulation pump connected to the evaporator and a high-temperature pipeline circulation pump connected to the condenser;

[0015] Temperature sensors are arranged on the liquid inlet pipelines of the low-temperature pipeline circulation pump and the high-temperature pipeline circulation pump, temperature sensors are arranged on both the exhaust and suction pipelines of the compressor, a high-pressure pressure sensor and a high-pressure pressure switch are arranged on the exhaust pipeline of the compressor, and a low-pressure pressure sensor is arranged on the suction pipeline of the compressor;

[0016] The medium flowing out of the low-temperature pipeline circulation pump flows along the low-temperature main pipeline and enters the temperature adjustment branch and the differential release branch respectively, and finally returns to the evaporator along the evaporator liquid return main pipeline. The medium flowing out of the high-temperature pipeline circulation pump flows along the high-temperature main pipeline and enters the temperature adjustment branch and the differential release branch respectively, and finally returns to the condenser along the condenser liquid return main pipeline;

[0017] A high-temperature pipeline water flow switch is arranged on the condenser liquid return main pipeline, and a low-temperature pipeline water flow switch is arranged on the evaporator liquid return main pipeline.

[0018] Preferably, the balance tank includes a tank body, and a heat insulation baffle is arranged inside the tank body. The heat insulation baffle divides the tank body into a non-communicating low-temperature side and high-temperature side. A low-temperature interface communicating with the evaporator liquid return main pipeline is opened at the bottom of the low-temperature side, and a high-temperature interface communicating with the condenser liquid return main pipeline is opened at the bottom of the high-temperature side;

[0019] A balance hole communicating the low-temperature side and the high-temperature side is opened at the upper part of the heat insulation baffle, an overflow hole is opened on the side wall of the tank body, the opening of the overflow hole is higher than the opening of the balance hole, and a liquid adding port capable of adding materials into the low-temperature side and / or the high-temperature side is also opened at the top of the tank body.

[0020] Preferably, the structures and pipeline orientations of the differential release branch and the temperature adjustment branch are the same. The temperature adjustment branch includes a heat exchanger and a six-way reversing valve, and a heat exchanger inlet pipeline and a heat exchanger outlet pipeline are arranged between the heat exchanger and the six-way reversing valve;

[0021] An inlet cold liquid branch is arranged between the low-temperature main pipeline and the six-way reversing valve, an outlet cold liquid branch is arranged between the six-way reversing valve and the evaporator liquid return main pipeline, an inlet hot liquid branch is arranged between the high-temperature main pipeline and the six-way reversing valve, and an outlet hot liquid branch is arranged between the six-way reversing valve and the condenser liquid return main pipeline;

[0022] An electronic fan and a temperature sensor are arranged on the heat exchanger in the active temperature adjustment branch, a temperature sensor is arranged on the heat exchanger in the passive temperature adjustment branch, and an electronic fan and a temperature sensor are arranged on the heat exchanger in the differential release branch;

[0023] A fan and a temperature sensor are provided on the heat exchanger.

[0024] Preferably, the present application also provides a control logic for a heat recovery automotive air conditioning system, which has the following processes:

[0025] S1. System self-check: Detect whether each hardware in the system is working properly, whether the feedback of each hardware signal is normal, and whether the feedback of each sensor signal is normal. Calibrate the temperature sensor and the pressure sensor to ensure that the system is in a normal working state;

[0026] S2. Temperature detection and temperature difference judgment: In the standby state, the ambient temperature of the area where each temperature control branch is located is monitored in real time. During the operation of the system, the preset working parameters of the corresponding area are automatically read, and the temperature difference is judged based on each parameter, and then the working state of each component is adjusted;

[0027] S3. Pipeline temperature control: When the system receives a temperature control request at at least one place, the system adjusts the working temperatures of the low-temperature pipeline and the high-temperature pipeline according to the working state of the six-way directional valve in each temperature control branch. In addition, when the pipeline temperature fluctuates during operation, it is adaptively adjusted according to different situations to keep the pipeline temperature stable;

[0028] S4. Dynamic control; When there are start-stop actions in the temperature control branches in the system, the pipeline temperature is adjusted according to the comprehensive working state of the six-way directional valves in each temperature control area to ensure that the pipeline temperature is maintained within a reasonable range; and when the temperature fluctuates, the dynamic control logic adjusts it to ensure the sustainable operation of the system;

[0029] S5. Wind speed adjustment: In some temperature control branches with electronic fans, manual adjustment or automatic adjustment can be performed according to parameters such as the set temperature and the ambient temperature of the area; in the differential release branch, the electronic fan is automatically adjusted according to the preset temperature parameters of the system and the outdoor ambient temperature;

[0030] S6. Shutdown control: When the system shuts down due to the vehicle stopping running and turning off the power, the operation delay start control logic is run; when all temperature control branches reach their set temperatures, the operation delay protection control logic is run;

[0031] S7. Special functional control logic: In certain specific scenarios, a dedicated scenario control logic is added to improve the system performance;

[0032] S8. Underlying protection logic: When an abnormal situation occurs in the system, it can automatically protect the system components and maintain the safe operation of the system.

[0033] Preferably, the dynamic control of S4 includes the following three situations:

[0034] S41. When all the six-way reversing valves in the currently enabled temperature control branch are in the refrigeration mode, when the start-stop action of the temperature control branch occurs, there are three scenarios: increasing the temperature control branch in the refrigeration mode, decreasing the temperature control branch in the refrigeration mode, and increasing the temperature control branch in the heating mode. Adjust the system parameters according to different scenarios;

[0035] S42. When all the six-way reversing valves in the currently enabled temperature control branch are in the heating mode, when the start-stop action of the temperature control branch occurs, there are three scenarios: increasing the temperature control branch in the heating mode, decreasing the temperature control branch in the heating mode, and increasing the temperature control branch in the refrigeration mode. Adjust the system parameters according to different scenarios;

[0036] S43. When the six-way reversing valves in the currently enabled temperature control branch are in both heating and refrigeration modes, when the start-stop action of the temperature control branch occurs, there are four scenarios: increasing the temperature control branch in the refrigeration mode, decreasing the temperature control branch in the refrigeration mode, increasing the temperature control branch in the heating mode, and decreasing the temperature control branch in the heating mode. Adjust the system parameters according to different scenarios.

[0037] Preferably, the special functional control logic of S7 further includes the following three cases:

[0038] S71. Charging heat dissipation mode: During the charging process of the vehicle, when there is a cooling requirement for a specific temperature control branch, the corresponding temperature control branch can be cooled through a single-pipeline cycle at a specific temperature;

[0039] S72. Driving heat dissipation mode: During the driving process of the vehicle, when there is only a cooling requirement for the passive temperature control branch, the corresponding temperature control branch can be cooled through a single-pipeline cycle at a specific temperature;

[0040] S73. Waste heat recovery mode: In the S72 driving heat dissipation mode, under specific temperature conditions, through this control logic, the heat that should be transferred to the outside of the vehicle can be selected to be transferred back to the interior of the car to achieve the purpose of waste heat recovery.

[0041] The beneficial effects of the present invention are:

[0042] 1. The six-way reversing valve is controlled by an electromagnetic coil, with a simple structure, and can freely switch between three modes: refrigeration, heating, and closing by changing the current state in the electromagnetic coil. In addition, this valve does not have the delay problem during the refrigeration and heating switching in the traditional heat pump air conditioning system.

[0043] 2. By simplifying and modularizing the refrigerant side, the high-pressure pipeline is integrated on the refrigerant side in this system. This can not only make the automotive air conditioning system safer and less prone to problems such as refrigerant leakage, but also can significantly reduce the amount of refrigerant used.

[0044] 3. The system connects all the cold (hot) areas of the vehicle through high-temperature pipelines and low-temperature pipelines, enabling full-vehicle thermal management. In addition, each cold (hot) area can provide independent heating and cooling without mutual interference, increasing the application flexibility of the system.

[0045] 4. The present application designs the control logic of the heat recovery automotive air conditioning system, avoiding the incompatibility problem between the traditional automotive air conditioning system and this system. In addition, this control logic provides the normal operation mode of the heat recovery automotive air conditioning system and the energy-saving operation mode under special scenarios, greatly improving the application and implementation ability of this system.

[0046] 5. The control logic of the heat recovery automotive air conditioning system in the present application has strong compatibility, can be applied to systems using different refrigerants, and can also meet the different requirements of different temperature zones. Only the corresponding parameters need to be changed according to the requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 is a perspective view of the six-way reversing valve of the present invention;

[0048] Figure 2 is a top view and a sectional view of the valve body of the six-way reversing valve of the present invention;

[0049] Figure 3 is a perspective view of the slider of the six-way reversing valve of the present invention;

[0050] Figure 4 is a sectional view of the six-way reversing valve of the present invention in the refrigeration, heating, and closed modes;

[0051] Figure 5 is a perspective view of the balance tank of the present invention;

[0052] Figure 6 is a perspective view of the balance tank of the present invention;

[0053] Figure 7 is a sectional view of the balance tank of the present invention;

[0054] Figure 8 is a system schematic diagram of the heat recovery automotive air conditioning system of the present invention;

[0055] Figure 9 is Figure 8 a schematic diagram of the pipeline of the first branch in

[0056] Figure 10 is Figure 8 a schematic diagram of the balance tank, the cold and heat source assembly, and the power assembly in

[0057] The accompanying drawings are only for illustrative purposes and should not be construed as limitations on this patent. To better illustrate this embodiment, some components in the drawings are omitted, enlarged, or reduced, which do not represent the dimensions of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. Detailed implementation manners

[0058] The present invention will be further described below with reference to the accompanying drawings.

[0059] Embodiment 1

[0060] As Figure 1 — Figure 4 As shown, the six-way directional valve 1 of this embodiment includes a valve body 11. On one side of the valve body 11, a low-temperature pipeline outlet 111, a low-temperature pipeline inlet 112, a high-temperature pipeline outlet 113, and a high-temperature pipeline inlet 114 are provided. On the other side of the valve body 11, a heat exchanger outlet 116 that can communicate with the low-temperature pipeline outlet 111 or the high-temperature pipeline outlet 113 is provided, and a heat exchanger inlet 115 that can communicate with the low-temperature pipeline inlet 112 or the high-temperature pipeline inlet 114 is also provided on the other side of the valve body 11.

[0061] A slider is provided inside the valve body 11 to switch the communication states of the low-temperature pipeline outlet 111, the low-temperature pipeline inlet 112, the high-temperature pipeline outlet 113, the high-temperature pipeline inlet 114, the heat exchanger outlet 116, and the heat exchanger inlet 115.

[0062] An electromagnetic coil 14 is provided at the end of the valve body 11, and a magnet 16 that is attracted or repelled by the energized electromagnetic coil 14 is provided inside the slider 15.

[0063] An iron hoop 13 that can attract the magnet 16 is provided on the side wall of the valve body 11.

[0064] Two through first through holes 151 and second through holes 152 are provided on the slider 15. On the upper and lower sides of the first through hole 151 and the second through hole 152, non-through low-temperature communication grooves 153 and high-temperature communication grooves 154 are provided respectively. A chamfer 155 is also provided on the side wall of the slider 15. There is a gap between the chamfer 155 and the inner wall of the valve body 11. The function of the chamfer 155 is to prevent the slider from being inserted in the wrong direction during assembly; the gap is for connecting the cavity areas on both sides of the slider. If there is no gap and it is a completely sealed structure, the slider will not be able to move due to the internal air pressure. After connecting the two sides with the gap, this situation does not exist.

[0065] The six-way directional valve 1 has three working modes: refrigeration, heating, and closing. In the refrigeration mode, the electromagnetic coil 14 is directly connected with direct current in the forward direction. The magnet 16 in the slider 15 is pre-positioned in a fixed direction, so that the magnetic pole direction generated on the side of the electromagnetic coil 14 close to the magnet 16 and the magnetic pole direction of the side of the magnet 16 close to the electromagnetic coil 14 are the same-named magnetic poles, which will push the magnet 16 and the slider 15 upward to the highest point. At this time, the first through hole 151 is respectively connected to the low-temperature pipeline outlet 111 and the heat exchanger outlet 116, and the second through hole 152 is respectively connected to the low-temperature pipeline inlet 112 and the heat exchanger inlet 115. The low-temperature medium in the low-temperature main pipeline 73 enters the six-way directional valve through the low-temperature pipeline inlet 112, passes through the second through hole 152, enters the heat exchanger through the heat exchanger inlet 115. The low-temperature medium exchanges heat with the external environment in the heat exchanger, reducing the temperature of the external environment. After circulating in the heat exchanger, the low-temperature medium passes through the heat exchanger outlet 116, passes through the first through hole 151, and enters the evaporator return main pipeline 65 through the low-temperature pipeline outlet 111. The high-temperature medium in the high-temperature main pipeline 74 passes through the high-temperature pipeline inlet 114, passes through the high-temperature communication groove 154, and enters the condenser return main pipeline 66 through the high-temperature pipeline outlet 113. Ensure that the pipeline pressures of the media in the high-temperature pipeline and the low-temperature pipeline are balanced under the high-temperature circulation pump and the low-temperature circulation pump with the same rotation speed.

[0066] In the heating mode, the electromagnetic coil 14 is directly connected with direct current in the reverse direction. The magnetic pole direction generated on the side of the electromagnetic coil 14 close to the magnet 16 and the magnetic pole direction of the side of the magnet 16 close to the electromagnetic coil 14 are opposite-named magnetic poles, which will attract the magnet 16 and the slider 15 downward to the lowest point. At this time, the first through hole 151 is respectively connected to the high-temperature pipeline outlet 113 and the heat exchanger outlet 116, and the second through hole 152 is respectively connected to the high-temperature pipeline inlet 114 and the heat exchanger inlet 115. The high-temperature medium in the high-temperature main pipeline 74 enters the six-way directional valve through the high-temperature pipeline inlet 114, passes through the second through hole 152, enters the heat exchanger through the heat exchanger inlet 115. The high-temperature medium exchanges heat with the external environment in the heat exchanger, increasing the temperature of the external environment. After circulating in the heat exchanger, the high-temperature medium passes through the heat exchanger outlet 116, passes through the first through hole 151, and enters the condenser return main pipeline 66 through the high-temperature pipeline outlet 113. The low-temperature medium in the low-temperature main pipeline 73 passes through the low-temperature pipeline inlet 112, passes through the low-temperature communication groove 153, and enters the evaporator return main pipeline 65 through the low-temperature pipeline outlet 111. Ensure that the pipeline pressures of the media in the high-temperature pipeline and the low-temperature pipeline are balanced under the high-temperature circulation pump and the low-temperature circulation pump with the same rotation speed.

[0067] In the closing mode, the electromagnetic coil 14 is powered off. Under the attracting action of the iron hoop 13, the magnet 16 drives the slider 15 to move to the middle of the valve body 11. At this time, the low-temperature pipeline inlet 112, the low-temperature pipeline outlet 111, the high-temperature pipeline inlet 114, and the high-temperature pipeline outlet 113 are all blocked by the slider, and there is no medium flow in the heat exchanger.

[0068] The materials of the valve body 11 and the slider 15 cannot be attracted by a magnet and have a low expansion coefficient, such as ceramics, glass, etc. The wall surface inside the valve body 11 in contact with the slider 15 needs to be smooth enough to enable the slider 15 to move freely in the valve body 11 without liquid leakage. In practical applications, there should be no substances such as magnets and ironware that can be attracted or repelled by a magnet around the installation position of the six-way directional valve 1, and the specific distance should be such that it does not affect its normal operation.

[0069] The six-way directional valve of this embodiment can not only achieve a delay-free switch between the refrigeration and heating modes, but also control the start and stop of the flow path. Moreover, this six-way directional valve simplifies the electronic control system and can achieve the refrigeration and heating switching of the valve and the start and stop of the valve only by using one electromagnetic coil.

[0070] Embodiment Two

[0071] As Figure 8 — Figure 10 As shown in the figure, this embodiment provides a heat recovery automotive air conditioning system, which includes a balance tank 2, a cold and heat source assembly 6, a power assembly 7, two differential release branches located outside the vehicle and four temperature adjustment branches located inside the vehicle. The two differential release branches are the first differential release branch 85 and the second differential release branch 86, which are responsible for releasing the excess heat or cold of the system to the outside of the vehicle; the four temperature adjustment branches are the first branch 81, the second branch 82, the third branch 83 and the fourth branch 84, and the four temperature adjustment branches respectively correspond to four different cold (heat) using areas inside the vehicle. The differential release branches and the temperature adjustment branches both use the six-way directional valve 1 in Embodiment One.

[0072] The cold and heat source assembly 6 includes a compressor 64, a condenser 63, a liquid receiver dryer 67, an expansion valve 62 and an evaporator 61. The power assembly 7 includes a low-temperature pipeline circulation pump 71 connected to the evaporator 61 and a high-temperature pipeline circulation pump 72 connected to the condenser 63; in this application, the high-pressure pipeline on the refrigerant side is integrated in the cold and heat source assembly, and the structure of the cold and heat source assembly is extremely simple and can be prepared modularly, and problems such as leakage and explosion are not likely to occur. In addition, for a refrigeration system using carbon dioxide as the refrigerant, there is a problem of excessive pressure and insecurity, and for a refrigeration system using R290 as the refrigerant, there is a risk of flammability and explosion. In the application of this system, integrating the preparation of the cold and heat source assembly can make the system safer and more reliable. In addition, the refrigerant in this embodiment only flows in the cold and heat source assembly, greatly reducing the refrigerant usage.

[0073] The liquid receiver dryer 67 is located before the expansion valve 62. The liquid receiver dryer 67 mainly has functions such as storing refrigerant, drying the inside of the system pipeline, filtering impurities in the pipeline, and gas-liquid separation; when the compressor starts and stops, the liquid receiver dryer 67 can relieve the pressure fluctuation and protect the stable operation of the system.

[0074] A temperature sensor T4 is provided on the liquid inlet pipeline of the low-temperature pipeline circulation pump 71, which is used to monitor the low-temperature pipeline temperature t4. A temperature sensor T3 is provided on the liquid inlet pipeline of the high-temperature pipeline circulation pump 72, which is used to monitor the high-temperature pipeline temperature t3. A high-pressure pressure sensor P1, a high-pressure pressure switch PS, and a temperature sensor T1 are provided on the exhaust pipeline of the compressor 64. The high-pressure pressure sensor P1 can monitor the high-pressure p1 in the cold and heat source assembly and transmit the pressure signal data to the system control module; the high-pressure pressure switch PS is a mechanical or electronic binary control device, connected in series in the compressor control circuit. When the pressure reaches the preset threshold, the trigger contact disconnects, and then the compressor is powered off and stops, preventing the system from damaging the compressor, bursting the pipeline, or overheating the condenser due to excessive pressure; the temperature sensor T1 is used to monitor the exhaust temperature t1 of the compressor. A low-pressure pressure sensor P2 and a temperature sensor T2 are provided on the suction pipeline of the compressor 64. The low-pressure pressure sensor P2 can monitor the low-pressure p2 in the cold and heat source assembly and transmit the pressure signal data to the system control module; the temperature sensor T2 is used to monitor the suction temperature t2 of the compressor.

[0075] The medium flowing out of the low-temperature pipeline circulation pump 71 flows along the low-temperature main pipeline 73 and enters the temperature adjustment branch and the differential release branch respectively, and finally returns to the evaporator 61 along the evaporator liquid return main pipeline 65. The medium flowing out of the high-temperature pipeline circulation pump 72 flows along the high-temperature main pipeline 74 and enters the temperature adjustment branch and the differential release branch respectively, and finally returns to the condenser 63 along the condenser liquid return main pipeline 66. The liquid medium used in the low-temperature main pipeline 73, the high-temperature main pipeline 74, the evaporator liquid return main pipeline 65, and the condenser liquid return main pipeline 66 should meet the requirements that it does not boil and evaporate at the highest allowable working temperature of the system and does not condense and block the pipeline at the lowest allowable working temperature of the system.

[0076] A high-temperature pipeline water flow switch W1 is provided on the condenser liquid return main pipeline 66. The high-temperature pipeline water flow switch W1 is used to monitor the medium flow state in the high-temperature pipeline in real time and judge whether the medium flow rate in the pipeline meets the standard. When the flow rate reaches a certain value, the liquid flow switch converts the liquid flow signal into a switch-type electrical signal and allows the cold and heat source assembly to start; when the medium flow rate is insufficient, it automatically cuts off the operation of the cold and heat source assembly or the compressor in the cold and heat source assembly to avoid damaging the components. A low-temperature pipeline water flow switch W2 is provided on the evaporator liquid return main pipeline 65. The low-temperature pipeline water flow switch W2 is used to monitor the medium flow state in the high-temperature pipeline in real time. When the flow rate reaches a certain value, it allows the cold and heat source assembly to start; when the medium flow rate is insufficient, it automatically cuts off the operation of the cold and heat source assembly or the compressor in the cold and heat source assembly to avoid damaging the components.

[0077] Such as Figure 5 — Figure 7As shown, the balance tank 2 includes a tank body 21, and a heat insulation baffle 27 is arranged in the tank body 21. The heat insulation baffle 27 divides the tank body into a low-temperature side and a high-temperature side that are not connected to each other. A low-temperature interface 22 connected to the evaporator return liquid main line 65 is opened at the bottom of the low-temperature side, and a high-temperature interface 23 connected to the condenser return liquid main line 66 is opened at the bottom of the high-temperature side. Filters 29 are arranged in the low-temperature interface 22 and the high-temperature interface 23 to prevent foreign matter from entering the evaporator return liquid main line 65 (i.e., the low-temperature line) or the condenser return liquid main line 66 (i.e., the high-temperature line) to cause system failure.

[0078] A balancing hole 28 connecting the low-temperature side and the high-temperature side is provided on the upper part of the heat-insulating baffle 27, an overflow hole is provided on the side wall of the tank body 21, and the opening of the overflow hole is higher than the opening of the balancing hole 28. A liquid adding port 26 for adding materials to the low-temperature side and / or the high-temperature side is also provided on the top of the tank body 21, in order to facilitate the addition of the medium used in the evaporator return liquid main line 65 or the condenser return liquid main line 66. A closing cover 25 is installed on the liquid adding port 26. After the liquid addition is completed, the closing cover 25 is tightened in time to prevent foreign matter from entering the tank.

[0079] When the system is running, the liquid medium inside it will expand and contract due to heat and cold. When the temperature difference between the medium in the high-temperature pipeline and the medium in the low-temperature pipeline is too large, the medium level on the low-temperature side in the balance tank 2 will drop significantly, and the medium level on the high-temperature side will increase significantly. When the medium rises to the position of the balance hole 28, it can enter the low-temperature side through the balance hole 28; when the system stops running, the medium level on the high-temperature side drops, and the liquid level on the low-temperature side rises to the position of the balance hole 28. The medium can return to the high-temperature side through the balance hole 28 to balance the fluid volume on both sides.

[0080] An overflow hole is provided on the side wall of the tank body 21, and an overflow pipe 24 is connected to the overflow hole. The opening height of the overflow hole is greater than the height of the balancing hole 28. The overflow hole can balance the internal pipeline pressure of the system with the external atmospheric pressure. In addition, in special extreme cases, such as when the liquid level of the medium added to the low-temperature side and the high-temperature side of the tank is high, and the car is exposed to the sun for a long time in summer, resulting in a substantial increase in the temperature of the medium in the high-temperature pipeline and the low-temperature pipeline, the medium liquid level on both sides of the balancing tank will rise significantly to exceed the height of the balancing hole 28 and reach the height of the overflow hole, and the liquid can be discharged to the outside of the balancing tank 2 through the overflow pipe 24, thereby protecting the system.

[0081] The tank body 21, the closure cover 25 and the insulation baffle 27 should be made of heat-insulating materials to minimize the heat exchange between the low-temperature side medium and the high-temperature side medium in the tank, and between the medium in the tank and the external environment. In the implementation and application, the balance tank must be placed at the highest position of the entire system, otherwise the liquid in the pipeline will overflow through the balance tank. In addition, the balance tank must be placed upright, that is, the liquid filling hole is always facing upward, and it is not allowed to tilt, invert, or place on its side. The overflow pipe must be facing downward to prevent the liquid from being blocked when it flows out.

[0082] During the normal operation of the system, the low-temperature pipeline circulation pump 71 and the high-temperature pipeline circulation pump 72 continuously suck the liquid medium in the return pipelines of the low-temperature pipeline and the high-temperature pipeline into the low-temperature main pipeline and the high-temperature main pipeline. The liquid medium circulates in the low-temperature pipeline and the high-temperature pipeline. The balance tank itself does not participate in the circulation of the fluid in the pipeline. Only when the liquid inside it expands and contracts thermally, resulting in a change in the volume of the fluid in the pipeline, the balance tank plays a role in compensating for the volume change caused by thermal expansion and contraction.

[0083] The structures and pipeline orientations of the two differential release branches and the four temperature adjustment branches are the same, only the heat exchange capacities of the heat exchangers are different. In this embodiment, the four temperature adjustment branches are the first branch 81, the second branch 82, the third branch 83, and the fourth branch 84, and the corresponding cold (hot) using areas are the front row position inside the car cabin, the rear row position inside the car cabin, the car battery, the power assembly, and the electronic components. As Figure 9 shown, the first branch 81 includes a heat exchanger 811 and a six-way reversing valve 1. A heat exchanger inlet pipeline 817 and a heat exchanger outlet pipeline 818 are provided between the heat exchanger 811 and the six-way reversing valve 1.

[0084] In this embodiment, an electronic fan and a temperature sensor are provided on the heat exchangers of the first branch 81 and the second branch 82 of the active temperature adjustment branch, a temperature sensor is provided on the heat exchangers of the third branch 83 and the fourth branch 84 of the passive temperature adjustment branch, and an electronic fan and a temperature sensor are provided on the heat exchanger in the differential release branch.

[0085] An inlet cold liquid branch 813 is provided between the low-temperature main pipeline 73 and the six-way reversing valve 1, an outlet cold liquid branch 814 is provided between the six-way reversing valve 1 and the evaporator return main pipeline 65, an inlet hot liquid branch 815 is provided between the high-temperature main pipeline 74 and the six-way reversing valve 1, and an outlet hot liquid branch 816 is provided between the six-way reversing valve 1 and the condenser return main pipeline 66. A fan 819 and a temperature sensor T5 are also provided on the heat exchanger 811. The fan 819 is a variable-speed fan driven by an electric motor and can adjust the rotation speed of the fan within a certain range. The temperature sensor T5 is used to monitor the ambient temperature t5 in the front row of the car cabin.

[0086] Temperature sensors T5, T6, T7, T8, T9, and T10 are respectively provided on the heat exchangers of the first branch 81, the second branch 82, the third branch 83, the fourth branch 84, the first differential release branch 85, and the second differential release branch 86, and are respectively used to monitor the ambient temperature t5 in the front row inside the car cabin, the ambient temperature t6 in the rear row inside the car cabin, the internal temperature t7 of the battery pack, the temperature t8 of the power assembly and the electronic components, the ambient temperature t9, and the ambient temperature t10.

[0087] The compressor 64 in this embodiment is a variable-frequency compressor. The principle for selecting the refrigerant depends on the operating conditions of the vehicle. For example, in central and southern China, refrigerants such as R290 and R134a can be selected, which can support reliable operation in an environment between -25°C and 50°C. In northern China, northern Europe and other regions, R744 refrigerant can be used, which can support reliable operation in an environment between -30°C and 50°C. Let the rated power of the compressor be w and the minimum operating power be wl. The minimum suction pressure of the compressor is pl, the maximum discharge pressure of the compressor is ph, the minimum suction temperature of the compressor is tl, and the maximum discharge temperature of the compressor is th.

[0088] The expansion valve 62 is an electronic expansion valve, which needs to be selected according to the displacement of the compressor 64, and can provide an appropriate refrigerant flow rate for the cold and heat source components to meet the requirements of the evaporator 61. The maximum flow rate of the expansion valve 62 needs to match the displacement of the compressor 64 to ensure that the evaporator 61 can obtain an appropriate refrigerant supply under various operating conditions.

[0089] The low-temperature pipeline circulation pump 71 and the high-temperature pipeline circulation pump 72 adopt variable-frequency circulation pumps of the same specification, which can realize the adjustment of the medium flow rate in the pipeline within a certain range. Let the rated flow rate of the circulation pump be q and its minimum flow rate be ql.

[0090] The following parameters also need to be set in this embodiment:

[0091] The temperature set value of the front row in the car cabin of the temperature control branch is tf, the temperature setting range is tfl - tfh, and the allowable temperature offset is ±Δtf;

[0092] The temperature set value of the rear row in the car cabin of the temperature control branch is tb, the temperature setting range is tbl - tbh, and the allowable temperature offset is ±Δtb;

[0093] The allowable operating temperature range of the battery pack in the temperature control branch is tdl - tdh, and the optimal operating temperature is td;

[0094] The allowable operating temperature range of the powertrain and electronic components in the temperature control branch is tpl - tph, and the optimal operating temperature is tp;

[0095] The set temperature of the low-temperature pipeline medium is tm, and the set temperature of the high-temperature pipeline medium is tn;

[0096] The allowable operating temperature range of the low-temperature pipeline and high-temperature pipeline media is tal - tah;

[0097] The allowable operating environment temperature range of this system is tel - teh (i.e., the external environment).

[0098] There are the following requirements for the heat transfer quantity of the heat exchangers in the four temperature control branches and the two differential release branches:

[0099] 1. When the working environment temperature is teh and the temperature of the high - temperature pipeline medium is th, the first and second branches are set to the lowest working temperatures tfl and tbl in the corresponding scenarios, the third and fourth branches are set to the highest working temperatures tdh and tph in the corresponding scenarios. The fans in the first branch 81, the second branch 82, the first differential release branch 85, and the second differential release branch 86 operate at the rated power. Let the heat exchange amounts of the first, second, third, and fourth branches and the heat exchange amounts of the first differential release branch 85 and the second differential release branch 86 be Q1, Q2, Q3, Q4, Q5, and Q6 respectively, then it is necessary to satisfy Q1 + Q2 + Q3 + Q4 ≤ Q5 + Q6.

[0100] 2. When the working environment temperature is tel and the temperature of the low - temperature pipeline medium is tl, the first and second branches are set to the highest working temperatures tfh and tbh in the corresponding scenarios, the third and fourth branches are set to the lowest working temperatures tdl and tpl in the corresponding scenarios. The fans in the first branch 81, the second branch 82, the first differential release branch 85, and the second differential release branch 86 operate at the rated power. Let the heat exchange amounts of the first, second, third, and fourth branches and the heat exchange amounts of the first differential release branch 85 and the second differential release branch 86 be W1, W2, W3, W4, W5, and W6 respectively, then it is necessary to satisfy W1 + W2 + W3 + W4 ≤ W5 + W6.

[0101] The control logic flow of the automotive air - conditioner is as follows:

[0102] S1. System self - check

[0103] When the vehicle is in the powered - on state or the charging state, the air - conditioner system control module starts to work and conducts a system self - check, including detecting whether each hardware in the system works normally, whether the feedback of each hardware signal is normal, and whether the feedback of each sensor signal is normal, and calibrating the temperature sensor and the pressure sensor to ensure that the system is in a normal working state. After the self - check, the system enters the standby state, ready to read the set working temperatures of each temperature - regulating branch.

[0104] S2. Temperature detection and temperature difference judgment

[0105] In the standby state, the air - conditioner system control module monitors the temperatures of the battery pack of the temperature - regulating branch, the powertrain of the temperature - regulating branch, and the electronic components in real - time. These two are passive temperature - regulating branches. The air - conditioner system control module pre - sets the allowable working temperature range and the optimal working temperature for them. During the system operation, it automatically reads the set allowable working temperature and the temperature in the corresponding area.

[0106] When it is detected that t7 < tdl, the six-way directional valve in the third branch 83 is adjusted to the heating mode; when it is detected that tdl ≤ t7 ≤ tdh, the six-way directional valve in the third branch 83 is adjusted to the closed mode; when it is detected that t7 > tdh, the six-way directional valve in the third branch 83 is adjusted to the cooling mode.

[0107] When it is detected that t8 < tpl, the six-way directional valve in the fourth branch 84 is adjusted to the heating mode; when it is detected that tpl ≤ t8 ≤ tph, the six-way directional valve in the fourth branch 84 is adjusted to the closed mode; when it is detected that t8 > tph, the six-way directional valve in the fourth branch 84 is adjusted to the cooling mode.

[0108] The front row in the car cabin of the temperature adjustment branch and the rear row in the car cabin of the temperature adjustment branch are active temperature adjustment branches. The air-conditioning system control module pre-sets the temperature setting range and the temperature allowable offset for them. However, the temperature setting value is input by the user, and the system can read the user's temperature setting value through the control module. The temperature setting value refers to the desired target temperature set by the user. The temperature setting range refers to the adjustable range of this desired target temperature. The temperature allowable offset means that after the current temperature adjustment branch reaches the user's desired target temperature, when the temperature changes beyond the allowable offset, the corresponding start command can be issued again. For example, the temperature setting range of the rear row in the car cabin of the temperature adjustment branch can be set to 16 - 30 °C, the current temperature setting value is 20 °C, and the temperature allowable offset is ±1 °C.

[0109] When the front row in the car cabin receives the air-conditioning start command, the air-conditioning system control module starts to receive and read the ambient temperature and the set temperature of the front row in the car cabin. When it is detected that t5 < tf - Δtf, the six-way directional valve in the first branch 81 is adjusted to the heating mode; when it is detected that tf - Δtf ≤ t5 ≤ tf + Δtf, the six-way directional valve in the first branch 81 is adjusted to the closed mode; when it is detected that t5 > tf + Δtf, the six-way directional valve in the first branch 81 is adjusted to the cooling mode.

[0110] When the rear row in the car cabin receives the air-conditioning start command, the air-conditioning system control module starts to receive and read the ambient temperature and the set temperature of the rear row in the car cabin. When it is detected that t6 < tb - Δtb, the six-way directional valve in the second branch 82 is adjusted to the heating mode; when it is detected that tb - Δtb ≤ t6 ≤ tb + Δtb, the six-way directional valve in the second branch 82 is adjusted to the closed mode; when it is detected that t6 > tb + Δtb, the six-way directional valve in the second branch 82 is adjusted to the cooling mode.

[0111] S3. Pipeline temperature control

[0112] When the air-conditioning system control module detects that the six-way reversing valve in at least one branch is not in the closed state, it transmits a signal to start the power assembly, causing the media in the high-temperature pipeline and the low-temperature pipeline to circulate. (The high-temperature pipeline refers to the high-temperature main pipeline 74 and the condenser liquid return main pipeline 66, and the low-temperature pipeline refers to the low-temperature main pipeline 73 and the evaporator liquid return main pipeline 65)

[0113] Secondly, the specific working mode of the six-way reversing valve will be determined:

[0114] When the six-way reversing valves in all four branches are in the heating mode, the six-way reversing valves in the first differential release branch 85 and the second differential release branch 86 are both adjusted to the cooling mode;

[0115] When the six-way reversing valves in all four branches are in the cooling mode, the six-way reversing valves in the first differential release branch 85 and the second differential release branch 86 are both adjusted to the heating mode;

[0116] When some of the six-way reversing valves in the four branches are in the cooling mode and some are in the heating mode, the six-way reversing valves in the first differential release branch 85 and the second differential release branch 86 are both adjusted to the closed mode.

[0117] When the air-conditioning system control module detects that all the six-way reversing valve mode switches are completed, it detects the high-temperature pipeline water flow switch W1 and the low-temperature pipeline water flow switch W2. After both detect the liquid flow signal, the cold and heat source assembly starts, and adjusts the low-temperature pipeline medium temperature and the high-temperature pipeline medium temperature to reach the system-pre-set low-temperature pipeline medium set temperature tm and high-temperature pipeline medium set temperature tn.

[0118] The setting of the working temperatures of the low-temperature pipeline and the high-temperature pipeline media depends on the temperature setting range of the active temperature control branch. The working temperature setting value of the low-temperature pipeline medium needs to be lower than the lowest adjustable temperature in the active temperature control branch, that is, tm < tfl and tm < tbl, so as to ensure that when the temperature control branch is set to the lowest temperature, the heat exchanger can still release cold to the temperature control branch; the working temperature setting value of the high-temperature pipeline medium needs to be higher than the highest adjustable temperature in the active temperature control branch, that is, tn > tfh and tn > tbh, so as to ensure that when the temperature control branch is set to the highest temperature, the heat exchanger can still release heat to the temperature control branch.

[0119] For example, the adjustable temperature range in the front row of the car is 16~30℃, the adjustable temperature range in the back row of the car is 18~32℃, the allowable working temperature range of the battery pack is 20~30℃, and the allowable working temperature range of the power assembly and electronic components is 10~50℃.

[0120] The set temperature of the medium in the low-temperature pipeline can be set to 11°C, which is lower than the lowest set temperature of 16°C in the active temperature control branch. The set temperature of the medium in the high-temperature pipeline can be set to 37°C, which is higher than the highest set temperature of 32°C in the active temperature control branch. The set temperature of the medium in the low-temperature pipeline ensures that there is still a certain temperature difference when the front row and the rear row of the vehicle are set to the lowest temperature, enabling its temperature control branch to reach the set temperature, and at the same time ensuring the normal operation of the battery pack, powertrain, and electronic components. Similarly, the set temperature of the medium in the high-temperature pipeline ensures that there is a certain temperature difference when the front row and the rear row of the vehicle are set to the highest temperature, enabling its temperature control branch to reach the set temperature, and also ensuring the normal operation of the battery pack, powertrain, and electronic components.

[0121] During the operation of the system, the changes in the ambient temperature, the temperature in the temperature control branch, the start and stop of the temperature control branch, etc. will cause fluctuations in the temperature of the medium in the low-temperature pipeline or the high-temperature pipeline. To prevent the frequent start and stop of the cold and heat source components, circulation pumps, or six-way reversing valves due to the temperature fluctuations of the medium in the pipeline, resulting in equipment damage, a set temperature threshold of ±Δtm for the medium in the low-temperature pipeline and a set temperature threshold of ±Δtn for the medium in the high-temperature pipeline are added. Only when the temperature of the medium in the pipeline exceeds the threshold can subsequent actions be triggered. For example: the set temperature of the medium in the low-temperature pipeline is 11°C, and the set temperature threshold of the medium in the low-temperature pipeline is ±2°C. Only when the temperature of the medium in the pipeline is lower than 9°C or higher than 13°C can subsequent actions be triggered.

[0122] The temperature adjustment of the medium in the low-temperature pipeline and the high-temperature pipeline is achieved by controlling the rotation speed of the circulation pump, the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the working mode of the six-way reversing valve in the two differential release branches. Among them, the compressor frequency, the opening degree of the electronic expansion valve, and the rotation speed of the circulation pump are adjusted adaptively. The opening degree of the electronic expansion valve and the frequency of the compressor can affect the superheat degree of the system, the working efficiency of the system, and prevent system fluctuations. The opening degree of the electronic expansion valve and the frequency of the compressor are coordinated through presetting to ensure the efficient and stable operation of the refrigeration system at different rotation speeds. The rotation speed of the circulation pump is proportional to the circulation pump flow. The higher the rotation speed, the higher the flow of the transported medium. There is a non-linear positive correlation between the rotation speed of the circulation pump and the compressor frequency, and the rotation speed of the circulation pump affects the maximum operating frequency of the compressor. When the compressor operating frequency exceeds the corresponding circulation pump rotation speed, heat and cold will accumulate in the condenser or evaporator. It should be noted that in the normal working mode, the flow rates of the low-temperature pipeline circulation pump and the high-temperature pipeline circulation pump always remain the same.

[0123] After the system starts and receives a temperature control request from at least one temperature control branch, the following judgments are made:

[0124] When all the six-way directional valves in the activated temperature control branches are in the heating mode, the six-way directional valves in the two differential release branches are adjusted to the cooling mode. Since all the activated temperature control branches have heating requirements and no cooling requirements, the set temperature tm of the low-temperature pipeline medium is not enabled. At this time, only the set temperature tn of the high-temperature pipeline medium needs to be reached. First, the circulation pump starts and operates at the lowest speed, monitoring the temperature of the high-temperature pipeline medium. If t3≥tn, that is, when the temperature of the high-temperature pipeline medium is not lower than the set temperature of the high-temperature pipeline medium, the current working mode is maintained; if t3<tn, that is, when the temperature of the high-temperature pipeline medium is lower than the set temperature of the high-temperature pipeline medium, the compressor in the cold heat source assembly is started and operates at the lowest frequency, and the temperature of the high-temperature pipeline medium is monitored in real time. At the same time, the compressor frequency is gradually increased. To prevent heat accumulation, the speed of the circulation pump is synchronously increased, and the opening of the electronic expansion valve is adaptively adjusted according to the compressor frequency. When t3 = tn, that is, when the temperature of the medium in the pipeline reaches the set temperature of the high-temperature pipeline medium, the current compressor frequency and the speed of the circulation pump are maintained.

[0125] During the subsequent operation process, the temperature of the high-temperature pipeline medium is monitored in real time. When the temperature of the high-temperature pipeline medium is higher than the upper limit of its set temperature threshold, that is, t3>tn + Δtn, the compressor frequency and the speed of the circulation pump are gradually reduced to make the temperature t3 of the medium in the high-temperature pipeline reach the set temperature tn of the high-temperature pipeline medium again. After reaching the set temperature, the current compressor frequency and the speed of the circulation pump are maintained; when the temperature of the high-temperature pipeline medium is within its set temperature threshold range, tn - Δtn≤t3≤tn + Δtn, the current compressor frequency and the speed of the circulation pump are maintained; when the temperature of the high-temperature pipeline medium is lower than the lower limit of its set temperature threshold, t3<tn - Δtn, the compressor frequency and the speed of the circulation pump are gradually increased to make the temperature t3 of the medium in the high-temperature pipeline rise back to the set temperature tn of the high-temperature pipeline medium. After reaching the set temperature, the current compressor frequency and the speed of the circulation pump are maintained.

[0126] When all the six-way reversing valves in the activated temperature control branches are in the refrigeration mode, the six-way reversing valves in the two differential release branches are adjusted to the heating mode. Since all the activated temperature control branches have refrigeration requirements and no heat demand, the set temperature tn of the high-temperature pipeline medium is not enabled. At this time, only the set temperature tm of the low-temperature pipeline medium needs to be reached. First, the circulation pump starts and operates at the lowest speed, monitoring the temperature of the low-temperature pipeline medium. If t4 ≤ tm, that is, when the temperature of the low-temperature pipeline medium is not higher than the set temperature of the low-temperature pipeline medium, maintain the current working mode; if t4 > tm, that is, when the temperature of the low-temperature pipeline medium is higher than the set temperature of the low-temperature pipeline medium, start the compressor in the cold heat source assembly and operate at the lowest frequency, monitor the temperature of the low-temperature pipeline medium in real time, and gradually increase the compressor frequency. To prevent heat accumulation, synchronously increase the speed of the circulation pump, and the opening of the electronic expansion valve is adaptively adjusted according to the compressor frequency. When t4 = tm, after the temperature of the medium in the low-temperature pipeline reaches the set temperature of the low-temperature pipeline medium, maintain the current compressor frequency and the speed of the circulation pump.

[0127] During the subsequent operation process, monitor the temperature of the low-temperature pipeline medium in real time. If the temperature of the low-temperature pipeline medium is lower than the lower limit of the set temperature threshold of the low-temperature pipeline medium, that is, t4 < tm - Δtm, gradually reduce the compressor frequency and the speed of the circulation pump to make the temperature of the low-temperature pipeline medium reach the set temperature of the low-temperature pipeline medium again. When t4 = tm, after reaching the set temperature of the low-temperature pipeline medium, maintain the current compressor frequency and the speed of the circulation pump; when tm - Δtm ≤ t4 ≤ tm + Δtm, that is, when the temperature of the low-temperature pipeline medium is within the set temperature threshold range of the low-temperature pipeline medium, maintain the current compressor frequency and the speed of the circulation pump; when t4 > tm + Δtm, that is, when the temperature of the low-temperature pipeline medium is higher than the set temperature threshold of the low-temperature pipeline medium, gradually increase the compressor frequency and the speed of the circulation pump to make the temperature of the low-temperature pipeline medium reach the set temperature of the low-temperature pipeline medium again. When t4 = tm, after reaching the set temperature of the low-temperature pipeline medium, maintain the current compressor frequency and the speed of the circulation pump.

[0128] When there are both refrigeration and heating modes in the six-way reversing valves of the activated temperature control branches, the six-way reversing valves in the two differential release branches are adjusted to the closed mode.

[0129] Since there is a heating demand and a cooling demand at this time, the set temperatures of both the low-temperature pipeline and the high-temperature pipeline need to be activated. First, the circulation pump starts and operates at the lowest speed, monitoring the medium temperature of the low-temperature pipeline and the medium temperature of the high-temperature pipeline. If t3≥tn and t4≤tm, that is, when the medium temperature of the high-temperature pipeline is not lower than the set temperature of the high-temperature pipeline and the medium temperature of the low-temperature pipeline is not higher than the set temperature of the low-temperature pipeline, the current working mode is maintained; if t3<tn and t4>tm, that is, when the medium temperature of the high-temperature pipeline is lower than the set temperature of the high-temperature pipeline and the medium temperature of the low-temperature pipeline is higher than the set temperature of the low-temperature pipeline, the compressor in the cold heat source assembly is started and operates at the lowest frequency, and the medium temperature of the low-temperature pipeline and the medium temperature of the high-temperature pipeline are monitored in real time. At the same time, the compressor frequency is gradually increased. To prevent the accumulation of cold and heat in the evaporator and condenser, the speed of the circulation pump is synchronously increased, and the opening of the electronic expansion valve is adaptively adjusted according to the compressor frequency until one of the medium temperature of the low-temperature pipeline and the medium temperature of the high-temperature pipeline can reach the set temperature, that is, t3≥tn or t4≤tm.

[0130] If the medium temperature of the low-temperature pipeline cannot reach the set temperature and the medium temperature of the high-temperature pipeline can reach the set temperature, that is, t3≥tn and t4>tm, continue to gradually increase the compressor frequency, synchronously increase the speed of the circulation pump, and the opening of the electronic expansion valve is adaptively adjusted according to the compressor frequency. At this time, both the heat and cold generated in the cold heat source assembly will increase. The medium temperature of the high-temperature pipeline and the medium temperature of the low-temperature pipeline are monitored in real time. If t3≤tn+Δtn and t4=tm, that is, when the medium temperature of the high-temperature pipeline does not exceed the upper limit of the set temperature threshold of the high-temperature pipeline and the medium temperature of the low-temperature pipeline reaches its set temperature, the current compressor frequency and the speed of the circulation pump are maintained; if t3>tn+Δtn and t4>tm, that is, when the medium temperature of the high-temperature pipeline exceeds the upper limit of the set temperature threshold of the high-temperature pipeline and the medium temperature of the low-temperature pipeline does not reach its set temperature, the six-way reversing valve in the first differential release branch 85 is adjusted to the heating mode. When t3=tn, the six-way reversing valve in the first differential release branch 85 is switched to the closed mode. At the same time, the compressor frequency and the speed of the circulation pump are still continued to be increased until t4=tm, that is, when the medium temperature of the low-temperature pipeline reaches the set temperature, the current compressor frequency and the speed of the circulation pump are maintained.

[0131] Subsequent low-temperature pipeline medium temperature control is achieved by adjusting the compressor frequency and the circulating pump speed. When t4 < tm - Δtm, gradually reduce the compressor frequency and the circulating pump speed to make the low-temperature pipeline medium temperature reach the low-temperature pipeline medium set temperature again. When t4 = tm, after reaching the low-temperature pipeline medium set temperature tm, maintain the current compressor frequency and the circulating pump speed; when tm - Δtm ≤ t4 ≤ tm + Δtm, when the low-temperature pipeline medium temperature is within the low-temperature pipeline medium set temperature threshold range, maintain the current compressor frequency and the circulating pump speed; when t4 > tm + Δtm, when the low-temperature pipeline medium temperature is higher than the low-temperature pipeline medium set temperature threshold, gradually increase the compressor frequency and the circulating pump speed to make the low-temperature pipeline medium temperature reach the low-temperature pipeline medium set temperature again. When t4 = tm, after reaching the low-temperature pipeline medium set temperature tm, maintain the current compressor frequency and the circulating pump speed. High-temperature pipeline medium temperature control is achieved by adjusting the working mode of the six-way directional valve in the first differential release branch 85. If t3 > tn + Δtn, when the high-temperature pipeline medium temperature exceeds the upper limit of the high-temperature pipeline medium set temperature threshold, adjust the six-way directional valve in the first differential release branch 85 to the heating mode. When t3 = tn, switch the six-way directional valve in the first differential release branch 85 to the closed mode. When tn - Δtn ≤ t3 ≤ tn + Δtn, when the temperature does not exceed the set temperature threshold, the six-way directional valve in the first differential release branch 85 remains in the closed mode.

[0132] If the high-temperature pipeline medium temperature cannot reach the set temperature and the low-temperature pipeline medium temperature can reach the set temperature, that is, t3 < tn and t4 ≤ tm, continue to gradually increase the compressor frequency and synchronously increase the circulating pump speed. The opening of the electronic expansion valve is adaptively adjusted according to the compressor frequency. At this time, both the heat and cold generated in the cold and heat source assembly will increase. Monitor the high-temperature pipeline medium temperature and the low-temperature pipeline medium temperature in real time. If t4 ≥ tm - Δtm and t3 = tn, the low-temperature pipeline medium temperature is not lower than the lower limit of the low-temperature pipeline medium set temperature threshold, and the high-temperature pipeline medium temperature reaches its set temperature, maintain the current compressor frequency and the circulating pump speed; if t4 < tm - Δtm and t3 < tn, the low-temperature pipeline medium temperature is lower than the lower limit of the low-temperature pipeline medium set temperature threshold, and the high-temperature pipeline medium temperature does not reach its set temperature, adjust the six-way directional valve in the second differential release branch 86 to the cooling mode. When t4 = tm, switch the six-way directional valve in the second differential release branch 86 to the closed mode. At the same time, continue to increase the compressor frequency and the circulating pump speed until t3 = tn, the high-temperature pipeline medium temperature reaches the set temperature, and maintain the current compressor frequency and the circulating pump speed.

[0133] The subsequent control of the medium temperature in the high-temperature pipeline is achieved by adjusting the compressor frequency and the rotational speed of the circulation pump. When t3 > tn + Δt, gradually reduce the compressor frequency and the rotational speed of the circulation pump to make the medium temperature in the high-temperature pipeline reach the set temperature of the high-temperature pipeline medium again. When t3 = tn, after reaching the set temperature of the high-temperature pipeline medium, maintain the current compressor frequency and the rotational speed of the circulation pump; when tn - Δtn ≤ t3 ≤ tn + Δtn and the medium temperature in the high-temperature pipeline is within the set temperature threshold range of the high-temperature pipeline medium, maintain the current compressor frequency and the rotational speed of the circulation pump; when t3 < tn - Δt and the medium temperature in the high-temperature pipeline is lower than the lower limit of the set temperature threshold of the high-temperature pipeline medium, gradually increase the compressor frequency and the rotational speed of the circulation pump to make the medium temperature in the high-temperature pipeline reach the set temperature of the high-temperature pipeline medium again. When t3 = tn, after reaching the set temperature of the high-temperature pipeline medium, maintain the current compressor frequency and the rotational speed of the circulation pump. The control of the medium temperature in the low-temperature pipeline is achieved by adjusting the working mode of the six-way directional valve in the second differential release branch 86. If t4 < tm - Δtm and the medium temperature in the low-temperature pipeline is lower than the lower limit of the set temperature threshold of the low-temperature pipeline medium, adjust the six-way directional valve in the second differential release branch 86 to the refrigeration mode. When t4 = tm, switch the six-way directional valve in the second differential release branch 86 to the closed mode. When tm - Δtm ≤ t4 ≤ tm + Δtm and the medium temperature in the low-temperature pipeline does not exceed the set temperature threshold, the six-way directional valve in the second differential release branch 86 remains in the closed mode.

[0134] S4. Dynamic control

[0135] During the operation of the system, due to the start-stop actions of different temperature control branches, it is necessary to add dynamic control logic during operation, including three main situations:

[0136] S41. When all the temperature control branches in operation are in the refrigeration mode, the six-way directional valves of the two differential release branches are both in the heating mode. At this time, the set temperature of the low-temperature pipeline medium is in the enabled state, and the set temperature of the high-temperature pipeline medium is in the disabled state. When there are start-stop actions of the temperature control branches, there are the following three situations:

[0137] S411. When adding a temperature control branch in the refrigeration mode, the medium temperature in the low-temperature pipeline will rise. When t4 > tm + Δtm and the temperature rises above the upper limit of the set temperature threshold of the low-temperature pipeline medium, increase the compressor frequency and synchronously increase the rotational speed of the circulation pump. The six-way directional valves of the two differential release branches both remain in the heating mode. When t4 = tm and the medium temperature in the low-temperature pipeline drops to the set temperature of the low-temperature pipeline medium, maintain the current compressor frequency and the rotational speed of the circulation pump;

[0138] S412. Reduce the temperature control branch in the refrigeration mode. The temperature of the medium in the low-temperature pipeline will drop. When t4 < tm - Δtm, that is, when the temperature drops below the lower limit of the set temperature threshold of the medium in the low-temperature pipeline, reduce the compressor frequency and synchronously reduce the rotational speed of the circulation pump. The six-way directional control valves of the two differential release branches both maintain the heating mode. When t4 = tm, that is, when the temperature of the medium in the low-temperature pipeline drops to the set temperature of the medium in the low-temperature pipeline, maintain the current compressor frequency and the rotational speed of the circulation pump;

[0139] S413. Increase the temperature control branch in the heating mode. The temperature of the medium in the high-temperature pipeline will drop. At this time, due to the existence of the temperature control branch in the heating mode, it is necessary to start the set temperature tn of the high-temperature pipeline. When t3 > tn + Δtn, that is, when the temperature of the medium in the high-temperature pipeline is greater than the upper limit of its set temperature threshold, the six-way directional control valve in the first differential release branch 85 maintains the heating mode, the compressor frequency remains unchanged, and the rotational speed of the circulation pump remains unchanged; when tn - Δtn ≤ t3 ≤ tn + Δtn, that is, when the temperature of the medium in the high-temperature pipeline does not exceed the set temperature threshold of the medium in the high-temperature pipeline, the six-way directional control valves in the first differential release branch 85 and the second differential release branch 86 are switched to the closed mode, the compressor frequency remains unchanged, and the rotational speed of the circulation pump remains unchanged; when t3 < tn - Δtn, that is, when the temperature of the medium in the high-temperature pipeline is lower than the lower limit of its set temperature threshold, first switch the six-way directional control valves in the first differential release branch 85 and the second differential release branch 86 to the closed mode. Monitor the temperature of the medium in the high-temperature pipeline in real time. When it is monitored that the temperature of the medium in the high-temperature pipeline is rising continuously, keep it in the closed state; when it is monitored that the temperature of the medium in the high-temperature pipeline shows a downward trend or remains unchanged and does not reach the set temperature, increase the compressor frequency and synchronously increase the rotational speed of the circulation pump. The opening degree of the electronic expansion valve is adaptively adjusted according to the compressor frequency. Increasing the compressor frequency will cause the temperature of the medium in the low-temperature pipeline to drop and the temperature of the medium in the high-temperature pipeline to rise. If t4 ≥ tm - Δtm and t3 = tn, that is, the temperature of the medium in the low-temperature pipeline is not lower than the lower limit of the set temperature threshold of the medium in the low-temperature pipeline, and the temperature of the medium in the high-temperature pipeline reaches its set temperature, maintain the current compressor frequency and the rotational speed of the circulation pump, and the six-way directional control valves in the first differential release branch 85 and the second differential release branch 86 maintain the closed mode; for subsequent dynamic adjustment, the temperature of the medium in the high-temperature pipeline is determined by the working mode of the six-way directional control valve in the first differential release branch 85, and the temperature of the medium in the low-temperature pipeline is achieved by adjusting the compressor frequency and the rotational speed of the circulation pump.

[0140] If t4 < tm - Δtm and t3 < tn, that is, when the temperature of the medium in the low-temperature pipeline is lower than the lower limit of the set temperature threshold of the medium in the low-temperature pipeline and the temperature of the medium in the high-temperature pipeline has not reached its set temperature, the six-way directional control valve in the second differential release branch 86 is adjusted to the refrigeration mode. When t4 = tm, the six-way directional control valve in the second differential release branch 86 is switched to the closed mode. At the same time, the compressor frequency and the circulation pump speed are still increased until t3 = tn, that is, the temperature of the medium in the high-temperature pipeline reaches the set temperature, and the current compressor frequency and circulation pump speed are maintained. For subsequent dynamic regulation, the temperature of the medium in the low-temperature pipeline is determined by the working mode of the six-way directional control valve in the second differential release branch 86, and the temperature of the medium in the high-temperature pipeline is achieved by adjusting the compressor frequency and the circulation pump speed.

[0141] S42. When all the temperature adjustment branches in operation are in the heating mode, the six-way directional control valves of the two differential release branches are in the refrigeration mode. The high-temperature pipeline starts the set temperature of the medium in the high-temperature pipeline, and the low-temperature pipeline does not start the set temperature of the medium in the low-temperature pipeline. When there are start / stop actions of the temperature adjustment branches, there are also the following three situations:

[0142] S421. When the temperature adjustment branch in the heating mode is increased, the temperature of the medium in the high-temperature pipeline will drop. When t3 < tn - Δtn, that is, when the temperature drops to be lower than the lower limit of the set temperature threshold of the medium in the high-temperature pipeline, the compressor frequency is increased, and the circulation pump speed is increased synchronously. The six-way directional control valves in the first differential release branch 85 and the second differential release branch 86 remain in the refrigeration mode. When t3 = tn, that is, when the temperature of the medium in the high-temperature pipeline rises to the set temperature of the high-temperature pipeline, the current compressor frequency and circulation pump speed are maintained;

[0143] S422. When the temperature adjustment branch in the heating mode is reduced, the temperature of the medium in the high-temperature pipeline will rise. When t3 > tn + Δtn, that is, when the temperature rises to be higher than the upper limit of the set temperature threshold of the medium in the high-temperature pipeline, the compressor frequency is decreased, and the circulation pump speed is decreased synchronously. The six-way directional control valves in the first differential release branch 85 and the second differential release branch 86 remain in the refrigeration mode. When t3 = tn, that is, when the temperature of the medium in the high-temperature pipeline drops to the set temperature of the high-temperature pipeline, the current compressor frequency and circulation pump speed are maintained;

[0144] S423. Add a temperature adjustment branch to the refrigeration mode. The temperature of the medium in the low-temperature pipeline will rise. Since there is a temperature adjustment branch in the refrigeration mode at this time, it is necessary to start the set temperature tm of the medium in the low-temperature pipeline. When t4 < tm - Δtm, that is, when the temperature of the low-temperature pipeline is less than the upper limit of its set temperature threshold, the six-way directional valve in the second differential release branch 86 maintains the refrigeration mode, the compressor frequency remains unchanged, and the circulating pump speed remains unchanged; when tm - Δtm ≤ t4 ≤ tm + Δtm, that is, when the temperature of the medium in the low-temperature pipeline is within the set temperature threshold range of the medium in the low-temperature pipeline, the six-way directional valves in the first differential release branch 85 and the second differential release branch 86 are switched to the closed mode, the compressor frequency remains unchanged, and the circulating pump speed remains unchanged; when t4 > tm + Δtm, that is, when the temperature of the medium in the low-temperature pipeline is higher than the upper limit of its set temperature threshold, first switch the six-way directional valves in the first differential release branch 85 and the second differential release branch 86 to the closed mode. Monitor the temperature of the medium in the low-temperature pipeline in real time. When it is monitored that the temperature of the medium in the low-temperature pipeline is continuously decreasing, keep it in the closed state; when it is monitored that the temperature of the medium in the low-temperature pipeline shows an upward trend or remains unchanged and does not reach the set temperature, increase the compressor frequency, synchronously increase the circulating pump speed, and the opening degree of the electronic expansion valve is adaptively adjusted according to the compressor frequency. Increasing the compressor frequency will cause the temperature of the medium in the low-temperature pipeline to decrease and the temperature of the medium in the high-temperature pipeline to rise. If t3 ≤ tn + Δtn and t4 = tm, that is, when the temperature of the medium in the high-temperature pipeline does not exceed the upper limit of the set temperature threshold of the medium in the high-temperature pipeline, and the temperature of the medium in the low-temperature pipeline reaches its set temperature, keep the current compressor frequency and circulating pump speed, and the six-way directional valves in the first differential release branch 85 and the second differential release branch 86 maintain the closed mode. For subsequent dynamic adjustment, the temperature of the medium in the low-temperature pipeline is determined by adjusting the working mode of the six-way directional valve in the second differential release branch 86, and the temperature of the medium in the high-temperature pipeline is achieved by adjusting the compressor frequency and the circulating pump speed.

[0145] If t3 > tn + Δtn and t4 > tm, that is, when the temperature of the medium in the high-temperature pipeline exceeds the upper limit of the set temperature threshold of the medium in the high-temperature pipeline, and the temperature of the medium in the low-temperature pipeline does not reach its set temperature, adjust the six-way directional valve in the first differential release branch 85 to the heating mode. When t3 = tn, switch the six-way directional valve in the first differential release branch 85 to the closed mode. At the same time, continue to increase the compressor frequency and the circulating pump speed until t4 = tm, that is, when the temperature of the medium in the low-temperature pipeline reaches the set temperature, keep the current compressor frequency and circulating pump speed. For subsequent dynamic adjustment, the temperature of the medium in the high-temperature pipeline is determined by adjusting the working mode of the six-way directional valve in the first differential release branch 85, and the temperature of the medium in the low-temperature pipeline is achieved by adjusting the compressor frequency and the circulating pump speed.

[0146] S43. When both the heating mode and the cooling mode exist in all the running temperature regulating branches, the high-temperature pipeline and the low-temperature pipeline are both started with set temperatures, and the working modes of the six-way reversing valves of the two differential release branches are uncertain. When the start-stop actions of the temperature regulating branches occur, there are the following four situations:

[0147] S431. When adding a temperature regulating branch in the cooling mode, the medium temperature of the low-temperature pipeline will gradually rise. When t4 > tm + Δtm and it rises above the upper limit of its set temperature threshold:

[0148] When the six-way reversing valve mode in the second differential release branch 86 is in the cooling mode, it is switched to the closed mode. When it is monitored that the medium temperature of the low-temperature pipeline is continuously decreasing after closing the six-way reversing valve, it remains in the closed state. When it is monitored that the medium temperature of the low-temperature pipeline is gradually rising or remaining unchanged and has not reached its set temperature, the compressor frequency is increased, and the circulation pump speed is synchronously increased. At this time, the medium temperature of the low-temperature pipeline gradually decreases. When the medium temperature of the low-temperature pipeline reaches the set temperature, the current compressor frequency and circulation pump speed are maintained. Since increasing the compressor frequency will cause the medium temperature of the high-temperature pipeline to rise, when t3 > tn + Δtn and the medium temperature of the high-temperature pipeline exceeds the upper limit of its threshold, the six-way reversing valve in the first differential release branch 85 needs to be switched to the heating mode. When t3 = tn and the medium temperature of the high-temperature pipeline reaches its set temperature again, the six-way reversing valve in the first differential release branch 85 is switched to the closed mode;

[0149] When the six-way reversing valves in the first differential release branch 85 and the second differential release branch 86 are in the closed mode, adding a temperature regulating branch in the cooling mode will cause the medium temperature of the low-temperature pipeline to rise. When t4 > tm + Δtm and it is monitored that the medium temperature of the low-temperature pipeline rises to the upper limit of the set temperature threshold, the compressor frequency needs to be increased, and the circulation pump speed is synchronously increased to make t4 = tm and the medium temperature of the low-temperature pipeline reach its set temperature. Increasing the compressor frequency will cause the medium temperature of the high-temperature pipeline to rise. When t3 > tn + Δtn and it is monitored that the medium temperature of the high-temperature pipeline rises to the upper limit of the set temperature threshold, the six-way reversing valve in the first differential release branch 85 needs to be switched to the heating mode. When t3 = tn and the medium temperature of the high-temperature pipeline reaches its set temperature again, the six-way reversing valve in the first differential release branch 85 is switched to the closed mode;

[0150] When the six-way reversing valve in the first differential release branch 85 is in the heating mode, adding a temperature regulating branch in the cooling mode will cause the medium temperature of the low-temperature pipeline to rise. When t4 > tm + Δtm and it is monitored that the medium temperature of the low-temperature pipeline rises to the upper limit of the set temperature threshold, the compressor frequency is increased, and the circulation pump speed is synchronously increased to make t4 = tm and the medium temperature of the low-temperature pipeline decrease to the set temperature, and the six-way reversing valve in the first differential release branch 85 remains in the heating mode.

[0151] S432. Add a temperature adjustment branch for the heating mode. The temperature of the medium in the high-temperature pipeline will gradually decrease. When t3 < tn - Δtn and drops below the lower limit of the set temperature threshold:

[0152] When the six-way directional valve mode of the first differential release branch 85 is in the heating mode, switch to the closed mode. When it is detected that the temperature of the medium in the high-temperature pipeline is rising after closing the six-way directional valve, keep it in the closed state; when it is detected that the temperature of the medium in the high-temperature pipeline is gradually decreasing or remaining unchanged and has not reached its set temperature, increase the compressor frequency and synchronously increase the rotational speed of the circulation pump. At this time, the temperature of the medium in the high-temperature pipeline gradually rises. When the temperature of the medium in the high-temperature pipeline reaches its set temperature, maintain the current compressor frequency and the rotational speed of the circulation pump. Since increasing the compressor frequency will also cause the temperature of the medium in the low-temperature pipeline to decrease, when t4 < tm - Δtm and the temperature of the medium in the low-temperature pipeline is below the lower limit of its set temperature threshold, the six-way directional valve of the second differential release branch 86 needs to be switched to the refrigeration mode;

[0153] When the six-way directional valves in the first differential release branch 85 and the second differential release branch 86 are in the closed mode, increase the compressor frequency and synchronously increase the rotational speed of the circulation pump to make t3 = tn, so that the temperature of the medium in the high-temperature pipeline reaches its set temperature. Increasing the compressor frequency will cause the temperature of the medium in the low-temperature pipeline to decrease. When it is detected that t4 < tm - Δtm and the temperature of the medium in the low-temperature pipeline drops to the lower limit of the set temperature threshold, switch the six-way directional valve of the second differential release branch 86 to the refrigeration mode;

[0154] When the six-way directional valve of the second differential release branch 86 is in the refrigeration mode, increase the compressor frequency and synchronously increase the rotational speed of the circulation pump to make t3 = tn, so that the temperature of the medium in the high-temperature pipeline rises to the set temperature, and the six-way directional valve of the second differential release branch 86 remains in the refrigeration mode.

[0155] S433. Reduce the temperature adjustment branch for the refrigeration mode. First, monitor whether there is still a temperature adjustment branch for the refrigeration mode in the monitoring system:

[0156] If there is no temperature adjustment branch for the refrigeration mode, do not enable the set temperature of the low-temperature pipeline, and adjust the six-way directional valves of both differential release branches to the refrigeration mode (if it is already in the refrigeration mode, maintain the current state). The compressor frequency is adjusted according to the temperature of the medium in the high-temperature pipeline. If t3 < tn - Δtn and the temperature of the medium in the high-temperature pipeline is below the lower limit of the set temperature threshold, increase the compressor frequency to make its temperature reach the set temperature; if tn - Δtn ≤ t3 ≤ tn + Δtn and the temperature of the medium in the high-temperature pipeline is within the set temperature threshold range of the high-temperature pipeline medium, maintain the current compressor frequency; if t3 > tn + Δtn and the temperature of the medium in the high-temperature pipeline is above the upper limit of the set temperature threshold, reduce the compressor frequency to make its temperature reach the set temperature.

[0157] If there is still a temperature adjustment branch in the cooling mode, reducing the temperature adjustment branch in the cooling mode will cause the temperature of the medium in the low-temperature pipeline to drop. When it is monitored that t4 < tm - Δtm and the temperature of the medium in the low-temperature pipeline is lower than the lower limit of the set temperature threshold:

[0158] When the six-way directional valve in the first differential release branch 85 is in the closed mode and the six-way directional valve in the second differential release branch 86 is in the cooling mode, maintain the current state and keep the compressor frequency unchanged. During operation, when it is monitored that t4 = tm and the temperature of the medium in the low-temperature pipeline reaches its set temperature, switch the six-way directional valve in the second differential release branch 86 to the closed mode.

[0159] When the six-way directional valves in both differential release branches are in the closed mode, switch the six-way directional valve in the second differential release branch 86 to the cooling mode and keep the compressor frequency unchanged. During operation, when it is monitored that t4 = tm and the temperature of the medium in the low-temperature pipeline reaches its set temperature, switch the six-way directional valve in the second differential release branch 86 to the closed mode.

[0160] When the six-way directional valve in the first differential release branch 85 is in the heating mode and the six-way directional valve in the second differential release branch 86 is in the closed mode, keep the six-way directional valve in the first differential release branch 85 in the heating mode, adjust the six-way directional valve in the second differential release branch 86 to the cooling mode, and gradually reduce the compressor frequency and synchronously reduce the speed of the circulation pump. At this time, monitor. If t4 = tm and the temperature of the medium in the low-temperature pipeline reaches its set temperature first, then adjust the six-way directional valve in the second differential release branch 86 to the closed mode and keep the compressor frequency unchanged; if t3 = tn and the temperature of the medium in the high-temperature pipeline reaches the set temperature first, then adjust the six-way directional valve in the first differential release branch 85 to the closed mode and maintain the current compressor frequency; during the operation of the system, when closing the six-way directional valve in the first differential release branch 85 or the second differential release branch 86, it may cause the temperature of the medium in the corresponding pipeline to cross the set temperature threshold again. When the six-way directional valve in the first differential release branch 85 is in the heating mode or the six-way directional valve in the second differential release branch 86 is in the cooling mode, continue to reduce the compressor frequency and the speed of the circulation pump until the temperature reaches the corresponding set temperature. This process continues to run until after closing the six-way directional valve in the first differential release branch 85 or the second differential release branch 86, the temperature of the medium in the low-temperature pipeline or the high-temperature pipeline no longer crosses the set temperature of the corresponding pipeline.

[0161] S434. Reduce the temperature adjustment branch in the heating mode. First, monitor whether there is still a temperature adjustment branch in the heating mode in the system:

[0162] If there is no temperature adjustment branch in the heating mode and the set temperature of the high-temperature pipeline is not enabled, adjust the six-way reversing valves in both the first differential release branch 85 and the second differential release branch 86 to the heating mode (if it is already in the heating mode, maintain the current state). Adjust the compressor frequency according to the medium temperature of the low-temperature pipeline. If t4 > tm + Δtm, that is, the medium temperature of the low-temperature pipeline is higher than the upper limit of the set temperature threshold, increase the compressor frequency so that the medium temperature of the low-temperature pipeline reaches its set temperature; if tm - Δtm ≤ t4 ≤ tm + Δtm, that is, the medium temperature of the low-temperature pipeline is within its set temperature threshold range, maintain the current compressor frequency; if t4 < tm - Δtm, that is, the medium temperature of the low-temperature pipeline is lower than the lower limit of the set temperature threshold, decrease the compressor frequency so that the medium temperature of the low-temperature pipeline reaches its set temperature.

[0163] If there is still a temperature adjustment branch in the heating mode, reducing the temperature adjustment branch in the heating mode will cause the medium temperature of the high-temperature pipeline to rise. When t3 > tn + Δtn, that is, when the medium temperature of the high-temperature pipeline rises to the upper limit of the set temperature threshold:

[0164] If the six-way reversing valve in the first differential release branch 85 is in the heating mode and the six-way reversing valve in the second differential release branch 86 is in the closed mode, maintain the current state and keep the compressor frequency unchanged. During operation, when it is monitored that t3 = tn, that is, the medium temperature of the high-temperature pipeline reaches its set temperature, switch the six-way reversing valve in the first differential release branch 85 to the closed mode.

[0165] If the six-way reversing valves in both the first differential release branch 85 and the second differential release branch 86 are in the closed mode, switch the six-way reversing valve in the first differential release branch 85 to the heating mode and keep the compressor frequency unchanged. During operation, when it is monitored that t3 = tn, that is, the medium temperature of the high-temperature pipeline reaches its set temperature, switch the six-way reversing valve in the first differential release branch 85 to the closed mode.

[0166] If the six-way directional valve in the first differential release branch 85 is in the closed mode and the six-way directional valve in the second differential release branch 86 is in the refrigeration mode, adjust the six-way directional valve in the first differential release branch 85 to the heating mode, keep the six-way directional valve in the second differential release branch 86 in the refrigeration mode, and gradually reduce the compressor frequency while synchronously reducing the rotational speed of the circulation pump. Monitor at this time. If t4 = tm and the temperature of the medium in the low-temperature pipeline reaches its set temperature first, then adjust the six-way directional valve in the second differential release branch 86 to the closed mode and keep the compressor frequency unchanged; if t3 = tn and the temperature of the medium in the high-temperature pipeline reaches the set temperature first, then adjust the six-way directional valve in the first differential release branch 85 to the closed mode and maintain the current compressor frequency. During the operation of the system, after closing the six-way directional valve in the first differential release branch 85 or the second differential release branch 86, it may cause the temperature of the medium in the corresponding pipeline to exceed the set temperature threshold again. After the six-way directional valve in the first differential release branch 85 is in the heating mode and the six-way directional valve in the second differential release branch 86 is in the refrigeration mode, continue to reduce the compressor frequency and the rotational speed of the circulation pump to make its temperature reach the corresponding set temperature. This process continues to run until after closing the six-way directional valve in the first differential release branch 85 or the second differential release branch 86, the temperature of the medium in the low-temperature pipeline or the high-temperature pipeline no longer exceeds the set temperature of the corresponding pipeline.

[0167] S5. Air velocity adjustment

[0168] In this embodiment, the first branch 81, the second branch 82, the first differential release branch 85, and the second differential release branch 86 all contain fans, and the air velocity of the fans needs to be reasonably controlled.

[0169] The fans in the first branch 81 and the second branch 82 are variable-frequency electronic fans, which support automatic adjustment and manual adjustment. The following takes the electronic fan in the first branch 81 as an example:

[0170] Manual adjustment: The start / stop and rotational speed of the electronic fan can be set on the in-vehicle control panel. The rotational speed adjustment supports the electronic fan to be adjusted arbitrarily between the minimum operating rotational speed and the rated rotational speed. When the electronic fan is in the stopped state, the first branch 81 is in the closed mode; when the first branch 81 is in the started state, it is default that the electronic fan runs at the rated rotational speed.

[0171] Automatic adjustment: After receiving the start command of the first branch 81, to prevent the wind blown by the electronic fan from being the wind of the ambient temperature in the temperature adjustment branch and causing discomfort, the electronic fan will start with a delay. The air-conditioning system control module automatically collects the high-temperature pipeline medium temperature t3, the low-temperature pipeline medium temperature t4, the set temperature tf of the temperature adjustment branch, and the current ambient temperature t5 of the temperature adjustment branch. If the six-way reversing valve in the first branch 81 is in the refrigeration mode, when the low-temperature pipeline medium temperature reaches the set temperature of the low-temperature pipeline medium, the electronic fan starts; if the six-way reversing valve in the first branch 81 is in the heating mode, when the high-temperature pipeline medium temperature reaches the set temperature of the high-temperature pipeline medium, the electronic fan starts. The air-conditioning system control module calculates the difference Δt (Δt = |t f - t5|) between the set temperature tf of the first branch 81 and the current ambient temperature t5 of the temperature adjustment branch.

[0172] If Δt > x1 °C, the electronic fan runs at the rated speed; if x2 °C < Δt ≤ x1 °C, the electronic fan runs at a% of the rated speed; if x3 °C < Δt ≤ x2 °C, the electronic fan runs at b% of the rated speed; if x4 °C < Δt ≤ x3 °C, the electronic fan runs at c% of the rated speed; if 0 < Δt ≤ x4 °C, the electronic fan runs at d% of the rated speed;

[0173] If Δt = 0 °C, the electronic fan in the current temperature adjustment branch is turned off (where x1 > x2 > x3 > x4, a > b > c > d, and d% of the rated speed of the electronic fan is greater than the minimum speed of the electronic fan). For example: If Δt > 12 °C, the electronic fan runs at the rated speed; if 9 °C < Δt ≤ 12 °C, the electronic fan runs at 80% of the rated speed; if 6 °C < Δt ≤ 9 °C, the electronic fan runs at 60% of the rated speed; if 3 °C < Δt ≤ 6 °C, the electronic fan runs at 40% of the rated speed; if 0 °C < Δt ≤ 3 °C, the electronic fan runs at 20% of the rated speed; if Δt = 0 °C, the electronic fan in the current temperature adjustment branch is turned off. In this embodiment, the automatic adjustment logic of the electronic fan speed adopts a five-gear automatic adjustment mode, and more or fewer gears can also be adopted during the implementation process.

[0174] Alternative: stepless automatic adjustment. Set the electronic fan to operate at y% of the rated speed, and the minimum speed of the electronic fan is b%. Set the working function y = a * Δt, where a is the compensation coefficient. When Δt = m5, the output y value is am5, corresponding to the rated speed of the electronic fan; when Δt > m5, it still corresponds to the rated speed of the electronic fan; when b / a ≤ Δt < m5, the fan automatically adjusts its speed according to the output y value; when 0 < Δt < b / a, the electronic fan operates at the lowest speed; when Δt = 0, the electronic fan is turned off. For example: the minimum speed of the electronic fan is 10% of the rated speed, and the program sets the value of a to 25 / 3. Then when Δt = 12°C, the output y value is 100, corresponding to the electronic fan operating at 100% of the rated speed, that is, at the rated speed; when Δt > 12°C, the electronic fan still operates at the rated speed; when 1.2°C ≤ Δt < 12°C, the electronic fan automatically adjusts its speed according to Δt; when 0 < Δt < 1.2°C, the electronic fan operates at the lowest speed. When Δt = 0, the electronic fan is turned off.

[0175] The electronic fan control logic in the second branch 82 is the same as that in the first branch 81, and will not be elaborated in this embodiment.

[0176] The fans in the first differential release branch 85 and the second differential release branch 86 are both fixed-frequency electronic fans, adopting an automatic adjustment control logic, and the start and stop of the fans are controlled by the air-conditioning system control module. The following takes the electronic fan in the first differential release branch 85 as an example:

[0177] The function of the electronic fan in the first differential release branch 85 is as follows: when the heat exchanger in it has poor heat exchange with the outside world, it plays a role in strengthening heat exchange. Therefore, it is necessary to monitor the medium temperatures in the high-temperature pipeline and the low-temperature pipeline to determine whether the electronic fan starts or stops. The starting temperature of the electronic fan is preset in the air-conditioning system control module. The starting temperature is divided into an upper limit starting temperature tx and a lower limit starting temperature ty. When it is monitored that the six-way reversing valve in the first differential release branch 85 is in the heating mode, the air-conditioning system control module automatically monitors the upper limit starting temperature tx. When t3 > tx or t4 > tx, that is, when the medium temperature in the high-temperature pipeline or the low-temperature pipeline exceeds the upper limit starting temperature, the electronic fan in the first differential release branch 85 starts; when it is monitored that the six-way reversing valve in the first differential release branch 85 is in the cooling mode, the air-conditioning system control module automatically monitors the lower limit starting temperature ty. When t3 < ty or t4 < ty, that is, when the medium temperature in the high-temperature pipeline or the low-temperature pipeline is lower than the lower limit starting temperature, the electronic fan in the first differential release branch 85 starts. It should be noted that the upper limit starting temperature tx needs to be greater than the set temperature tn of the high-temperature pipeline and less than the upper allowable working temperature tah of the media in the low-temperature pipeline and the high-temperature pipeline, that is, tn < tx < tah; the lower limit starting temperature ty needs to be less than the set temperature tm of the low-temperature pipeline and greater than the lower allowable working temperature tal of the media in the low-temperature pipeline and the high-temperature pipeline, that is, tal < ty < tm.

[0178] The shutdown of the electronic fan depends on the working state of the six-way reversing valve in the first differential release branch 85. After the fan starts, it will strengthen the heat exchange between the heat exchanger in the first differential release branch 85 and the outside world, and will gradually make the medium temperature in the low-temperature pipeline or the high-temperature pipeline reach its set temperature. When the set temperature is reached, the six-way reversing valve switches to the closed state. When the electronic fan monitors that the six-way reversing valve switches to the closed state, it also switches to the closed state at the same time. That is, when the six-way reversing valve in the first differential release branch 85 is in the closed state, the electronic fan stops working; when the six-way reversing valve in the first differential release branch 85 is in the cooling or heating mode, the electronic fan determines whether to start according to the working mode of the six-way reversing valve and the upper and lower limit starting temperatures.

[0179] The control logic of the electronic fan in the second differential release branch 86 is the same as that in the first differential release branch 85, so it will not be elaborated here.

[0180] S6. Shutdown Control

[0181] During the system operation, there are two shutdown modes. One is the system shutdown caused by the car stopping running and turning off the power; the other is the system shutdown caused by all the temperature adjustment branches reaching their set temperatures and all the six-way reversing valves in the temperature adjustment branches in the system being in the closed state.

[0182] When in the first shutdown mode, the compressor, the electronic expansion valve, and the high and low temperature pipeline circulation pump will stop operating. After losing power, all the six-way directional control valves in the system will be placed in the closed mode. When in this shutdown mode, there are pressure differences and temperature differences in the cold and heat source assembly. The compressor in the cold and heat source assembly cannot be started immediately, and a delayed start control logic needs to be added. When the vehicle is restored to power or in the charging state, the air conditioning system control module makes a time judgment. If the compressor shutdown time is greater than n seconds, the cold and heat source assembly is allowed to start (the value of n is determined according to the time for the pressure in the cold and heat source assembly to return to equilibrium and can be obtained through experimental tests).

[0183] When in the second shutdown mode, in order to prevent the system from starting and stopping frequently, a delayed protection control logic needs to be added. When all the six-way directional control valves in the temperature control branches are in the closed state, the cold and heat source assembly stops working first. Secondly, the six-way directional control valves in the two differential release branches are both placed in the closed mode. The high and low temperature pipeline circulation pump is adjusted to the minimum speed and keeps running. After running for m seconds, if no cooling (heating) demand in the temperature control branch is received, the high and low temperature pipeline circulation pump is switched to the closed mode (the value of m is set according to the median of the time interval for the system to receive the cooling (heating) demand in the temperature control branch again during the annual operation of the system, to avoid frequent start and stop due to too short delayed protection time and excessive energy consumption due to too long delayed protection time). At the same time, in order to prevent the compressor in the cold and heat source assembly from starting and stopping frequently, a compressor delayed start control logic is added. When the start command for the cold and heat source assembly is received again, the air conditioning system control module makes a time judgment. If the compressor shutdown time is greater than n seconds, the cold and heat source assembly is allowed to start.

[0184] S7. Special functional control logic

[0185] S71. Charging heat dissipation mode

[0186] Since a large amount of heat is generated by the battery when the electric vehicle is charging, if the heat is not discharged from the battery pack area in time, it will cause the problem of battery overheating. When the vehicle is charging and not powered on, only the battery pack corresponding to the third branch 83 may have cooling (heating) demand. To improve the system performance, a control logic for dealing with this mode is added.

[0187] When it is monitored that the temperature of the third branch 83 exceeds tdh, a cooling demand is transmitted. If the vehicle is charging and not powered on at this time, and the external ambient temperature is lower than tdh - Δt1, where tdh is the upper limit of the allowable operating temperature of the battery pack of the third branch 83, and Δt1 is the necessary heat transfer temperature difference, which can be obtained through experimental tests. The following control logic can be triggered:

[0188] At this time, only the low-temperature pipeline circulation pump is turned on. The six-way directional valve in the third branch 83 is set to the refrigeration mode, and the six-way directional valves in the two differential release branches are also set to the refrigeration mode. The electronic fans in the two differential release branches operate at the rated power. This control logic can transfer heat from the battery pack corresponding to the third branch 83 to the outside through the circulation of the single low-temperature pipeline, so as to achieve the purpose of reducing the temperature of the battery pack. When the temperature of the third branch 83 reaches the optimal operating temperature td, the six-way directional valve in the third branch 83, the six-way directional valves in the two differential release branches, and the low-temperature pipeline circulation pump are turned off in sequence.

[0189] For example: the allowable operating temperature range of the third branch 83 is 20 - 30 °C, the optimal operating temperature is 25 °C, and the necessary heat transfer temperature difference is taken as 3 °C. When the outdoor temperature is lower than 27 °C, the above control logic can be triggered. When the temperature of the battery pack corresponding to the third branch 83 reaches the optimal operating temperature of 25 °C, the machine stops, and the six-way directional valve in the third branch 83, the six-way directional valves in the two differential release branches, and the low-temperature pipeline circulation pump are turned off in sequence.

[0190] S72. Driving heat dissipation mode

[0191] When the vehicle is in motion, heat is generated during the discharge of the battery pack and the operation of the powertrain and electronic components. If the heat is not discharged from the corresponding temperature control branch in time, there is a risk of overheating and damaging the equipment. When the vehicle is in the powered-on state, if the first branch 81 and the second branch 82 are in the closed state and there is only a cooling demand for the third branch 83 or the fourth branch 84, in order to reduce the system energy consumption, the following control logic is added.

[0192] When it is monitored that t7 > tdh, that is, the temperature of the battery pack corresponding to the third branch 83 exceeds the upper limit of its allowable operating temperature, a cooling demand is transmitted. When t9 < tdh - Δt1, that is, the ambient temperature is lower than the upper limit of the allowable operating temperature of the battery pack and there is a heat transfer temperature difference of Δt1, at this time, only the low-temperature pipeline circulation pump is turned on. The six-way directional valve in the third branch 83 is set to the refrigeration mode, and the six-way directional valves in the two differential release branches are also set to the refrigeration mode. The electronic fans in the two differential release branches are selected to operate or not according to the low-temperature pipeline medium temperature t4. When t4 > tdh, that is, the low-temperature pipeline medium temperature is higher than the upper limit of the allowable operating temperature of the battery pack, the electronic fans in the two differential release branches operate at the rated power; when t4 ≤ tdh, that is, the low-temperature pipeline medium temperature is not higher than the upper limit of the allowable operating temperature of the battery pack, the electronic fans in the two differential release branches remain in the closed mode.

[0193] When it is monitored that t8 > tph, that is, when the temperature of the powertrain and electronic components corresponding to the fourth branch 84 exceeds the upper limit of its allowable operating temperature, a cooling demand is transmitted. When t9 < tph - Δt1, that is, when the ambient temperature is lower than the upper limit of the allowable operating temperature of the powertrain and electronic components and there is a heat transfer temperature difference of Δt1, only the low-temperature pipeline circulation pump is turned on at this time. The six-way directional valve in the fourth branch 84 is placed in the refrigeration mode, and the six-way directional valves in the two differential release branches are also placed in the refrigeration mode. The electric fans in the two differential release branches select whether to operate according to the low-temperature pipeline medium temperature t4. When t4 > tph, that is, when the low-temperature pipeline medium temperature is higher than the upper limit of the allowable operating temperature of the powertrain and electronic components, the electric fans in the two differential release branches operate at the rated power; when t4 ≤ tph, that is, when the low-temperature pipeline medium temperature is not higher than the upper limit of the allowable operating temperature of the powertrain and electronic components, the electric fans in the two differential release branches remain in the closed mode.

[0194] When it is monitored that t7 > tdh and t8 > tph, that is, when the temperatures of the battery pack, powertrain and electronic components all exceed the upper limit of their allowable operating temperatures, both the third branch 83 and the fourth branch 84 have a cooling demand. When the ambient temperature satisfies t9 < tdh - Δt1 and t9 < tph - Δt1, only the low-temperature pipeline circulation pump is turned on at this time. The six-way directional valves in the third branch 83, the fourth branch 84 and the two differential release branches are all placed in the refrigeration mode. The electric fans in the two differential release branches select whether to operate according to the low-temperature pipeline medium temperature t4. When t4 > tdh or t4 > tph, that is, when the low-temperature pipeline medium temperature is higher than the upper limit of the allowable operating temperature of either the third branch 83 or the fourth branch 84, the electric fans in the two differential release branches operate at the rated power; when t4 ≤ tdh and t4 ≤ tph, that is, when the low-temperature pipeline medium temperature is not higher than the upper limit of the allowable operating temperature of the third branch 83 and not higher than the upper limit of the allowable operating temperature of the fourth branch 84, the electric fans in the two differential release branches remain in the closed mode.

[0195] This control logic can transfer the heat generated in the battery pack, powertrain and electronic components to the outside through the circulation of the separate low-temperature pipeline, so as to achieve the purpose of reducing the temperatures of the battery pack, powertrain and electronic components. When the temperatures at both places reach their corresponding optimal temperatures, the six-way directional valves in the corresponding temperature control branches are closed. When the six-way directional valves in the third branch 83 and the fourth branch 84 are both in the closed mode, the six-way directional valves in the two differential release branches are closed in sequence, and finally the low-temperature pipeline circulation pump is turned off.

[0196] For example, the allowable operating temperature range of the battery pack is 20 - 30 °C, and the optimal operating temperature is 25 °C; the allowable operating temperature range of the powertrain and electronic components is 10 - 40 °C, and the optimal operating temperature is 20 °C; the heat transfer temperature difference is taken as 3 °C. When only the battery pack has a cooling demand, this control logic can be triggered when the ambient temperature is lower than 27 °C. When only the powertrain and electronic components have a cooling demand, this control logic can be triggered when the ambient temperature is lower than 37 °C. When both the battery pack, the powertrain and the electronic components have a cooling demand, this control logic can be triggered when the ambient temperature is lower than 27 °C.

[0197] S73. Waste heat recovery mode

[0198] When the vehicle is in the driving heat dissipation mode, the heat generated by the battery pack, the powertrain and the electronic components is transferred to the outside through a single-pipeline medium circulation. When there is a heating demand in the vehicle cabin, this part of the heat transferred to the outside can be changed to be transferred to the inside of the cabin to achieve the purpose of waste heat recovery. However, the ability to heat the cabin using waste heat recovery depends on the amount of heat generated by the battery pack and the powertrain and the electronic components, and it cannot actively adjust the amount of heat generated. Therefore, it is difficult to achieve the specific set temperature of the temperature adjustment branch inside the cabin. Therefore, this mode can only be used as a secondary supplementary function of the driving heat dissipation mode.

[0199] When the vehicle is in the driving heat dissipation mode, the air conditioning system control module automatically detects the internal temperature of the vehicle. When t5 < tdh - Δt1 and t5 < tph - Δt1 and t6 < tdh - Δt1 and t6 < tph - Δt1, a reminder is given to the passengers: "There is additional heat generated in the current air conditioning working mode. Do you need to use this heat to heat the vehicle cabin? 1. Yes 2. No. (Note: Using waste heat to heat the inside of the vehicle cabin does not consume additional electricity and has no impact on the vehicle's cruising range. In addition, the temperature cannot be set in this mode, but you can turn off this mode at any time.)"

[0200] When 2. No is selected, the driving heat dissipation mode is maintained at this time.

[0201] When "1. Required" is selected, a prompt will be given: "1. Heat the front row position; 2. Heat the rear row position; 3. Heat all positions." When "1. Heat the front row position" is selected, the six-way reversing valve in the corresponding first branch 81 of the air conditioning system control module is switched to the refrigeration mode, the electric fan in the first branch 81 operates at the rated power, and the six-way reversing valves in the two differential release branches are switched to the closed mode; when "2. Heat the rear row position" is selected, the six-way reversing valve in the corresponding second branch 82 of the air conditioning system control module is switched to the refrigeration mode, the electric fan in the second branch 82 operates at the rated power, and the six-way reversing valves in the two differential release branches are switched to the closed mode; when "3. Heat all positions" is selected, the six-way reversing valves in the first branch 81 and the second branch 82 are switched to the refrigeration mode, the electric fans in the first branch 81 and the second branch 82 operate at the rated power, and the six-way reversing valves in the two differential release branches are switched to the closed mode. The air speeds of the electric fans in the first branch 81 and the second branch 82 only support manual adjustment.

[0202] When "1. Heat the front row position" is selected, when t5≥tdh - Δt1 or t5≥tph - Δt1, the waste heat recovery mode is automatically exited and switched to the driving heat dissipation mode; when "2. Heat the rear row position" is selected, when t6≥tdh - Δt1 or t6≥tph - Δt1, the waste heat recovery mode is automatically exited and switched to the driving heat dissipation mode; when "3. Heat all positions" is selected, when both "t5≥tdh - Δt1 or t5≥tph - Δt1" and "t6≥tdh - Δt1 or t6≥tph - Δt1" are satisfied, the waste heat recovery mode is automatically exited and switched to the driving heat dissipation mode. When the temperatures of the battery pack, the powertrain, and the electronic components in the activated temperature control branch all reach their corresponding optimal temperatures, the driving heat dissipation mode is automatically exited.

[0203] S8. Bottom layer protection logic

[0204] In addition to the above automotive air conditioning system control logic, protective logic also needs to be added to the system to prevent component damage caused by system failures.

[0205] Voltage protection: In this system, if the input voltage of the compressor is too low, the compressor cannot start. If it is too high, it may cause the internal coil of the compressor to burn out. Therefore, relevant control logic needs to be added to avoid this phenomenon. Set the working voltage range uyl - uyh for the compressor. When the input voltage of the compressor is within this working voltage range, it can operate normally. When the input voltage is not within this working range, the compressor stops. Similarly, the high and low temperature pipeline circulation pump also needs to set the normal working voltage range uxl - uxh. When the input voltage of the high and low temperature pipeline circulation pump is within this working range, it can operate normally. When it exceeds this working range, the compressor stops. And the system monitors the input voltage values of the compressor and the circulation pump in real time. When the input voltage returns to the allowable working voltage range, the corresponding components can be restarted.

[0206] Current protection: When the compressor is working normally, changes in heat load, compressor frequency, etc. will cause changes in the current in the system circuit. Excessive current may cause the circuit to fuse and damage components. Therefore, overcurrent protection control logic needs to be added to the system. Set the maximum allowable working current Ih in the system. When the working current exceeds this maximum current value, the compressor stops. Similarly, the high and low temperature pipeline circulation pump also makes the above settings. The system monitors the current value in real time. When the working current returns to the allowable working current range, the compressor or the circulation pump can be restarted.

[0207] Liquid flow protection: Liquid flow protection is divided into two parts. The first is that after it is detected that there is medium flowing in both the low - temperature pipeline and the high - temperature pipeline, the cold - heat source component can be allowed to start. The second is that when the high and low temperature pipeline circulation pump has been turned on for a certain time and no medium flow is detected in the pipeline, the circulation pump is turned off to prevent the circulation pump from idling and causing damage. When the high and low temperature pipeline circulation pump is turned on, the low - temperature pipeline water flow switch and the high - temperature pipeline water flow switch monitor the medium flow state in the pipeline in real time. When no medium flow signal is detected, it indicates that the medium is not circulating in the pipeline. Starting from the time when the circulation pump is turned on, timing is carried out. When no flow signal is detected after t time (the time setting is based on the response time of the circulation pump and the time for the medium to circulate once in the pipeline), the corresponding pipeline circulation pump is turned off. When both the low - temperature pipeline water flow switch and the high - temperature pipeline water flow switch detect a medium flow signal in the pipeline, the cold - heat source component can be allowed to start.

[0208] Pressure protection: The pressure protection aims to protect the cold and heat source components to prevent pipe bursting inside the pipeline due to excessive pressure and prevent compressor idling and increased wear caused by too low pressure. When the cold and heat source components are in the operating state, the system monitors the high-pressure p1 and low-pressure p2 of the cold and heat source components in real time. The maximum allowable working pressure ph of the cold and heat source components is set in the air-conditioning system control module. When p1 > ph and the high-pressure sensor monitors that the high pressure exceeds the maximum working pressure, the compressor stops and the cold and heat source components stop working. The minimum allowable working pressure pl of the cold and heat source components is set in the air-conditioning system control module. When p2 > pl and the low-pressure sensor monitors that the low pressure is lower than the minimum working pressure, the compressor stops and the cold and heat source components stop working. When the system pressure returns to the normal working range, the compressor can be restarted. A high-pressure switch is also installed in this system, which can detect the high pressure by itself. When the high pressure exceeds its set value, it can cut off the power supply of the compressor without passing through the air-conditioning system control module, preventing damage to the compressor due to the failure of the air-conditioning system control module to cut off the power supply when a fault occurs.

[0209] Temperature protection: The temperature protection mainly protects the cold and heat source components and the high- and low-temperature pipelines. In the cold and heat source components, too high a compressor discharge temperature may cause damage to the cold and heat source components, and too low a suction temperature may cause the compressor lubricating oil to adhere and freeze. The maximum compressor discharge temperature th needs to be set. When t1 > th and the compressor discharge temperature exceeds the maximum discharge temperature, the compressor stops. The minimum compressor suction temperature tl is set. When t2 > tl and the compressor suction temperature is lower than the minimum suction temperature, the compressor stops. When the temperature returns to the normal range, it can resume operation. The allowable working temperature range tal - tah is set in the high- and low-temperature pipelines. When the temperature is too low, it will cause the medium inside the pipeline to freeze, and when the temperature is too high, it will cause problems such as evaporation or pipe bursting of the medium inside the pipeline. The high-temperature pipeline medium temperature t3 and the low-temperature pipeline medium temperature t4 need to be monitored in real time. When t3 > tah or t3 < tal or t4 > tah or t4 < tal, that is, when the high- and low-temperature pipeline medium temperature exceeds the upper limit of the allowable working temperature range or is lower than the lower limit of the allowable working temperature range, the cold and heat source components stop operating. When the temperature returns to the normal working temperature range, it can resume operation.

[0210] The above embodiments do not impose any formal restrictions on the shape, material, structure, etc. of the present invention. Any simple modifications, equivalent changes, and decorations made to the above embodiments based on the technical essence of the present invention all fall within the protection scope of the technical solution of the present invention.

[0211] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the protected content of the present invention.

[0212] If terms such as "first" and "second" are used in this document to define components, those skilled in the art should be aware that the use of "first" and "second" is only for the convenience of describing the present invention and simplifying the description. Without additional statements, the above terms have no special meanings.

[0213] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. Six-way directional control valve, comprising a valve body, characterized in that, One side of the valve body is provided with a low-temperature pipeline outlet, a low-temperature pipeline inlet, a high-temperature pipeline outlet and a high-temperature pipeline inlet. The other side of the valve body is provided with a heat exchanger outlet that can communicate with the low-temperature pipeline outlet or the high-temperature pipeline outlet. The other side of the valve body is also provided with a heat exchanger inlet that can communicate with the low-temperature pipeline inlet or the high-temperature pipeline inlet; A slider is arranged inside the valve body.

2. The six-way directional valve according to claim 1, characterized in that, An electromagnetic coil is arranged at the end of the valve body, and a magnet attracted or repelled by the energized electromagnetic coil is arranged inside the slider.

3. The six-way directional control valve according to claim 2, wherein An iron hoop capable of attracting the magnet is arranged on the side wall of the valve body.

4. Heat recovery automotive air conditioning system, characterized in that, It includes a balance tank, a cold and heat source assembly, a power assembly, at least one differential release branch located outside the vehicle and at least one temperature control branch located inside the vehicle. The differential release branch and / or the temperature control branch use the six-way reversing valve described in claims 1-3.

5. The heat recovery automotive air conditioning system according to claim 4, wherein, The cold and heat source assembly includes a compressor, a condenser, a liquid storage dryer, an expansion valve and an evaporator. The power assembly includes a low-temperature pipeline circulation pump communicating with the evaporator and a high-temperature pipeline circulation pump communicating with the condenser; Temperature sensors are arranged on the liquid inlet pipelines of the low-temperature pipeline circulation pump and the high-temperature pipeline circulation pump. Temperature sensors are arranged on the exhaust and suction pipelines of the compressor. A high-pressure pressure sensor and a high-pressure pressure switch are arranged on the exhaust pipeline of the compressor. A low-pressure pressure sensor is arranged on the suction pipeline of the compressor; The medium flowing out of the low-temperature pipeline circulation pump flows along the low-temperature main pipeline and enters the temperature control branch and the differential release branch respectively, and finally returns to the evaporator along the evaporator liquid return main pipeline. The medium flowing out of the high-temperature pipeline circulation pump flows along the high-temperature main pipeline and enters the temperature control branch and the differential release branch respectively, and finally returns to the condenser along the condenser liquid return main pipeline; A high-temperature pipeline water flow switch is arranged on the condenser liquid return main pipeline, and a low-temperature pipeline water flow switch is arranged on the evaporator liquid return main pipeline.

6. The heat recovery automotive air conditioning system according to claim 4, characterized in that, The balance tank includes a tank body. A heat insulation baffle is arranged inside the tank body. The heat insulation baffle divides the tank body into a non-communicating low-temperature side and high-temperature side. A low-temperature interface communicating with the evaporator liquid return main pipeline is arranged at the bottom of the low-temperature side. A high-temperature interface communicating with the condenser liquid return main pipeline is arranged at the bottom of the high-temperature side; A balance hole communicating the low-temperature side and the high-temperature side is arranged at the upper part of the heat insulation baffle. An overflow hole is arranged on the side wall of the tank body. The opening of the overflow hole is higher than the opening of the balance hole. A liquid filling port capable of adding liquid into the low-temperature side and / or the high-temperature side is also arranged at the top of the tank body.

7. The heat recovery automotive air conditioning system according to claim 4, characterized in that, The structures and pipeline orientations of the differential release branch and the temperature control branch are the same. The temperature control branch includes a heat exchanger and a six-way reversing valve. A heat exchanger inlet pipeline and a heat exchanger outlet pipeline are arranged between the heat exchanger and the six-way reversing valve; A cold liquid inlet branch is arranged between the low-temperature main pipeline and the six-way reversing valve. A cold liquid outlet branch is arranged between the six-way reversing valve and the evaporator liquid return main pipeline. A hot liquid inlet branch is arranged between the high-temperature main pipeline and the six-way reversing valve. A hot liquid outlet branch is arranged between the six-way reversing valve and the condenser liquid return main pipeline; An electronic fan and a temperature sensor are provided on the heat exchanger in the active temperature control branch, a temperature sensor is provided on the heat exchanger in the passive temperature control branch, and an electronic fan and a temperature sensor are provided on the heat exchanger in the differential release branch; A fan and a temperature sensor are provided on the heat exchanger.

8. Control logic of a heat recovery automotive air conditioning system, characterized in that, It has the following processes: S1. System self-check: Detect whether each hardware in the system works normally, whether the signal feedback of each hardware is normal, and whether the signal feedback of each sensor is normal, and calibrate the temperature sensor and the pressure sensor to ensure that the system is in a normal working state; S2. Temperature detection and temperature difference judgment: In the standby state, the ambient temperature of the area where each temperature control branch is located is monitored in real time. During the operation of the system, the preset working parameters of the corresponding area are automatically read, and the temperature difference is judged based on each parameter, and then the working state of each component is adjusted; S3. Pipeline temperature control: When the system receives a temperature control request at at least one place, the system adjusts the working temperature of the low-temperature pipeline and the high-temperature pipeline according to the working state of the six-way directional valve in each temperature control branch; in addition, when the pipeline temperature fluctuates during operation, it is adaptively adjusted according to different situations to keep the pipeline temperature stable; S4. Dynamic control; When there is a start-stop action in the temperature control branch of the system, the pipeline temperature is adjusted according to the comprehensive working state of the six-way directional valve in each temperature control area to ensure that the pipeline temperature is maintained within a reasonable range; and when the temperature fluctuates, the dynamic control logic adjusts it to ensure the sustainable operation of the system; S5. Wind speed adjustment: In some temperature control branches with electronic fans, manual adjustment or automatic adjustment can be performed according to parameters such as the set temperature and the ambient temperature of the area; in the differential release branch, the electronic fan is automatically adjusted according to the preset temperature parameters of the system and the outdoor ambient temperature; S6. Shutdown control: When the system shuts down due to the vehicle stopping running and turning off the power, the operation delay start control logic is run; when all temperature control branches reach their set temperatures, the operation delay protection control logic is run; S7. Special functional control logic: In some specific scenarios, a dedicated scenario control logic is added to improve the system performance; S8. Underlying protection logic: When the system encounters an abnormal situation, it can automatically protect the system components and maintain the safe operation of the system.

9. The control logic of the heat recovery automotive air conditioning system according to claim 8, characterized in that, The dynamic control of S4 includes the following three situations: S41. When all the six-way directional valves in the currently enabled temperature control branch are in the refrigeration mode, when there is a start-stop action in the temperature control branch, there are three scenarios: the temperature control branch with an increased refrigeration mode, the temperature control branch with a reduced refrigeration mode, and the temperature control branch with an increased heating mode. The system parameters are adjusted according to different scenarios; S42. When all the six-way directional valves in the currently enabled temperature control branch are in the heating mode, when there is a start-stop action in the temperature control branch, there are three scenarios: the temperature control branch with an increased heating mode, the temperature control branch with a reduced heating mode, and the temperature control branch with an increased refrigeration mode. The system parameters are adjusted according to different scenarios; S43. When the six-way reversing valve in the currently enabled temperature control branch has both heating and cooling modes, and when there is a start / stop action of the temperature control branch, there are four scenarios: the temperature control branch with the cooling mode increases, the temperature control branch with the cooling mode decreases, the temperature control branch with the heating mode increases, and the temperature control branch with the heating mode decreases. Adjust the system parameters according to different scenarios.

10. The control logic of the heat recovery automotive air conditioning system according to claim 8, characterized in that, The special functional control logic of S7 also includes the following three situations: S71. Charging heat dissipation mode: During the vehicle charging process, when there is a cooling requirement for a specific temperature control branch, the corresponding temperature control branch can be cooled through a single-pipe circulation at a specific temperature. S72. Driving heat dissipation mode: During the vehicle driving process, when there is only a cooling requirement for the passive temperature control branch, the corresponding temperature control branch can be cooled through a single-pipe circulation at a specific temperature. S73. Waste heat recovery mode: In the S72 driving heat dissipation mode, under specific temperature conditions, this control logic can be used to select to transfer the heat that should have been transferred to the outside of the vehicle back to the interior of the car to achieve the purpose of waste heat recovery.

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