Control method, device, equipment, medium and program product of dehumidification mode

Abstract

A control method and device (400), equipment (500), medium and program product of a dehumidification mode, by when detecting that the passenger compartment has dehumidification demand, obtaining the dehumidification load of the heat pump system and the external environment temperature;Then according to the dehumidification load, the external environment temperature and the load threshold, judge whether to enter the first dehumidification mode, the first dehumidification mode is used: in the dehumidification process, the heat absorbed by the external heat exchanger is used to heat and warm the air after flowing through the first internal heat exchanger;If yes, according to the air temperature at a plurality of first preset positions in the heat exchange box and the supercooling degree of the heat exchange medium at least one second preset position in the transmission pipeline, determine the control instruction of the first dehumidification mode;Then output the control instruction, so that the first target temperature and the second target temperature satisfy the preset requirement of the dehumidification function at the same time. Solve the technical problem of how to dehumidify new energy vehicles.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy vehicles, and more particularly to a dehumidification mode control method, device, equipment, medium and program product. BACKGROUND

[0002] With the development of vehicle technology, new energy vehicles have become the main trend of future vehicle development. Although there are many solutions in the field of traditional vehicle control, new challenges are faced in new energy vehicles because high-power drive motors and large-capacity batteries are introduced in new energy vehicles, which will bring new influences on the existing vehicle thermal management.

[0003] The humidity in the vehicle is an important indicator in the control of the passenger compartment. How to control the humidity in the vehicle on the new energy vehicle has a great influence on the ride comfort and vehicle system safety of the new energy vehicle.

[0004] Therefore, how to control the humidity in the vehicle of the new energy vehicle is a technical problem to be solved by the present application. SUMMARY

[0005] The purpose of the present application is to provide a dehumidification mode control method. By actively absorbing and transferring the heat in the external environment of the vehicle to the air in the passenger compartment, the temperature of the air outlet of the air conditioner during dehumidification can be improved, the air temperature in the passenger compartment can be maintained within a suitable range, and the dehumidification effect can be maintained within an optimal range while saving energy, without the need for the vehicle's own energy to supplement the heat for the dehumidification process.

[0006] In a first aspect, the present application discloses a dehumidification mode control method, comprising:

[0007] When it is detected that the passenger compartment has a dehumidification demand, the dehumidification load of a heat pump system and the external environment temperature are obtained, the heat pump system comprising an external heat exchanger and a first internal heat exchanger;

[0008] According to the dehumidification load, the external environment temperature and the load threshold, it is determined whether to enter a first dehumidification mode, the first dehumidification mode being used for: in the dehumidification process, the heat of the external environment is absorbed by the external heat exchanger to heat and raise the temperature of the air flowing through the first internal heat exchanger;

[0009] If yes, the control instruction of the first dehumidification mode is determined according to the air temperature at a plurality of first preset positions in the heat exchange box and the supercooling degree of the heat exchange medium at at least one second preset position in the transmission pipeline, the first preset positions comprising the air outlet and the air outlet side of the position where the first internal heat exchanger is located;

[0010] The output control instruction is used to make the first target temperature and the second target temperature meet the preset requirements of the dehumidification function at the same time, the first target temperature includes the air temperature at the air outlet, and the second target temperature is the air temperature on the air outlet side of the position where the first internal heat exchanger is located.

[0011] Based on the above technical content, when the humidity in the passenger compartment exceeds the optimal humidity range or the dehumidification function is manually started, the environmental temperature inside and outside the vehicle is first obtained through various vehicle-mounted sensors, and then the dehumidification load of the heat pump system at the current time is calculated. In addition, the external environmental temperature, that is, the temperature outside the vehicle, reflects whether it is suitable to actively absorb heat from the outside at the current time. When the dehumidification load exceeds the load threshold and the external heat is sufficient, the external heat exchanger on the heat pump system actively absorbs heat from the external environment, and the heat is transferred to the passenger compartment through the heat exchange medium, thereby saving the power output of the compressor in the dehumidification mode and saving the energy consumption of the vehicle. In this process, the control of the first target temperature at the air outlet and the second target temperature, that is, the air temperature on the air outlet side of the installation position of the first internal heat exchanger (such as an evaporator), is related to the stability and safety of the entire heat pump system. In the prior art, it is difficult to balance the two, often causing oscillation and noise of the heat pump system. However, the present application is through multi-stage temperature monitoring and closed-loop regulation in the heat exchange box, combined with closed-loop control of the supercooling degree of the heat exchange medium at the key position, and the air temperature at the air outlet and the air temperature on the air outlet side of the installation position of the evaporator are both within the respective safety ranges, thereby avoiding the stability and safety problems caused by the heat pump system absorbing external environmental heat to replace part of the compressor output power.

[0012] Optionally, in the first dehumidification mode, the control instruction includes a closed-loop control instruction for respectively performing closed-loop control on each controlled object in the heat pump system, and the role of the controlled object includes making the heat exchange medium circulate in a parallel circulation path in the transmission pipeline, and the parallel circulation path includes: a heat absorption path, a refrigeration path and a heat supplement path, the heat absorption path is connected in parallel with the refrigeration path, and then connected in series with the heat supplement path.

[0013] The external heat exchanger is located on the heat absorption path, the first internal heat exchanger is located on the refrigeration path, and the heat pump system further includes a second internal heat exchanger, the second internal heat exchanger is located on the heat supplement path, and the second internal heat exchanger is used to transfer the heat absorbed by the external heat exchanger to the air flowing through the first internal heat exchanger.

[0014] By taking the compressor as the start / stop point of the parallel circulation path, the parallel heat absorption path and refrigeration path meet at the compressor, forming the characteristics of the external heat exchanger and the first internal heat exchanger being low in pressure, both of which evaporate and absorb heat at the same time, the external heat exchanger absorbs the heat of the external environment, and the first internal heat exchanger absorbs the heat of the passenger cabin air, so that the water vapor in the passenger cabin air condenses and precipitates when cooled, achieving the purpose of refrigeration and dehumidification. Further, the second internal heat exchanger is used to heat and warm the air blown by the air blower to the first internal heat exchanger after condensation and dehumidification, so as to avoid the adverse effects of continuously lowering the temperature of the first internal heat exchanger to finally cause the first internal heat exchanger to freeze / frost.

[0015] In one implementation, the second preset position includes an output end of the second internal heat exchanger, and the supercooling degree includes a target supercooling degree of the output end;

[0016] According to the air temperature at the plurality of first preset positions in the heat exchange box and the supercooling degree of the heat exchange medium at the at least one second preset position in the transmission pipeline, a control instruction of the first dehumidification mode is determined, including:

[0017] According to the first target temperature and the first closed-loop control model, a first closed-loop control instruction of the compressor is determined;

[0018] According to the target supercooling degree and the second closed-loop control model, a second closed-loop control instruction of the first electronic expansion valve is determined, the first electronic expansion valve being installed at the output end of the second internal heat exchanger;

[0019] According to the second target temperature and the third closed-loop control model, a third closed-loop control instruction of the second electronic expansion valve is determined, the second electronic expansion valve being installed at the input end of the first internal heat exchanger.

[0020] The compressor is used to control the outlet temperature in a closed loop, compared with the prior art in which the compressor is used to control the temperature of the outlet side of the installation position of the first internal heat exchanger, i.e. the second target temperature, the present application changes to control the outlet temperature, i.e. the first target temperature, which is easier to achieve stable control. In this way, the technical obstacle of simultaneous stable control of the first target temperature and the second target temperature is overcome, and the problem of oscillation of the heat pump system caused by the prior art is avoided.

[0021] In one implementation, the dehumidification load of the heat pump system is obtained, including:

[0022] The passenger cabin temperature, the internal circulation percentage, the external circulation percentage, and the air volume of the air blower are obtained;

[0023] The dehumidification load is determined according to the preset standard value of the first target temperature, the external environment temperature, the external circulation percentage, the passenger cabin temperature, the internal circulation percentage and the air volume of the air blower by using a preset load model.

[0024] In one implementation, before the control instruction of the first dehumidification mode is determined according to the air temperature at a plurality of first preset positions in the heat exchange box and the supercooling degree of the heat exchange medium at at least one second preset position in the transmission pipeline, the method further comprises:

[0025] The first lower limit value of the operation of the second electronic expansion valve is determined according to the external environment temperature and a preset first corresponding relationship, the second electronic expansion valve being installed at the input end of the first internal heat exchanger.

[0026] The passenger cabin temperature, the internal circulation percentage, the external circulation percentage and the air volume of the air blower are obtained.

[0027] The first upper limit value of the operation of the second electronic expansion valve is determined according to the external environment temperature, the passenger cabin temperature, the internal circulation percentage, the external circulation percentage and the air volume of the air blower by using a preset algorithm.

[0028] The functions of the first upper limit value and the first lower limit value include suspending or switching the dehumidification mode of the heat pump system when the external environment temperature exceeds a first temperature range, and limiting the adjustment capacity of the first dehumidification mode to ensure the safety and stability of the system.

[0029] In one implementation, before the control instruction of the first dehumidification mode is determined according to the air temperature at a plurality of first preset positions in the heat exchange box and the supercooling degree of the heat exchange medium at at least one second preset position in the transmission pipeline, the method further comprises:

[0030] The second upper limit value and the second lower limit value of the operation of the first electronic expansion valve are determined according to the external environment temperature and a preset second corresponding relationship, the first electronic expansion valve being installed at the output end of the second internal heat exchanger.

[0031] The functions of the second upper limit value and the second lower limit value include suspending or switching the dehumidification mode of the heat pump system when the external environment temperature exceeds a second temperature range, and limiting the adjustment capacity of the first dehumidification mode to ensure the safety and stability of the system.

[0032] The upper limit and lower limit of the opening degree of the first electronic expansion valve and / or the second electronic expansion valve are limited because, under the limitation of the external environment, the heat that can be actively absorbed by the heat pump system is related to the temperature of the external environment. In order to avoid ignoring the objective limitation when the heat pump system is working, constantly increasing or decreasing the opening degree of the electronic expansion valve, causing system oscillation, producing serious noise, or the excessive opening degree fluctuation range makes the electronic expansion valve in some cases the current opening degree and the target opening degree of the control instruction differ too much, the adjustment time is too long, which also affects the stability of the system, or the adjustment of the electronic expansion valve has failed after exceeding the upper and lower limits. In order to avoid the controller issuing invalid target opening degree, the upper and lower limits are limited to maintain the stability of the entire heat pump system.

[0033] In one implementation, after outputting the control instruction, further comprising:

[0034] If it is detected that the opening degree of the first electronic expansion valve is the second lower limit value, and the supercooling degree of the output end of the second internal heat exchanger is less than or equal to the preset supercooling degree threshold value within a preset time, the dehumidification mode is switched to the second dehumidification mode. In the second dehumidification mode, the heat of the battery cooling circuit or the heat of the heating device is used to supplement the heat of the air flowing through the first internal heat exchanger during the dehumidification process.

[0035] The case of the present implementation shows that the first dehumidification mode cannot meet the dehumidification requirement, or the temperature of the external environment is too low, and the heat absorbed is insufficient, so the heat of other heating devices in the vehicle must be called to supplement the output power of the compressor.

[0036] In one implementation, after outputting the control instruction, further comprising:

[0037] Obtaining a pressure value of the input end of the compressor;

[0038] If the pressure value is less than a first pressure threshold value, the output of the second closed-loop control instruction of the first electronic expansion valve is suspended, and the opening degree of the first electronic expansion valve is increased at a preset rate until the pressure value is greater than or equal to a second pressure threshold value, and the output of the second closed-loop control instruction is restored. The first electronic expansion valve is installed at the output end of the second internal heat exchanger.

[0039] By controlling the pressure of the low pressure end, the pressure imbalance of the heat pump system is prevented. This is because the parallel dehumidification mode taken in the prior art is prone to cause system oscillation. In order to improve safety, reduce oscillation or prevent oscillation beyond the adjustment capacity of the system, monitoring the low pressure end pressure value is an effective measure to prevent oscillation found by the inventor. Since there is a certain delay in the calculation and execution of the control command, if the low pressure end pressure value is lower than the first pressure threshold value, it means that the delay may cause the working state of the entire system to exceed the adjustment capacity of the system in the first dehumidification mode, or the closed-loop control is too fast and the system state cannot keep up in time. At this time, the closed-loop control is suspended and the adjustment is continued after the low pressure end pressure is restored, so that the stability of the system is further guaranteed.

[0040] In one implementation, after outputting the control command, further comprising:

[0041] In response to the frost protection start command of the first internal heat exchanger, the second electronic expansion valve is closed, the first opening value of the second electronic expansion valve before being closed is recorded, and the speed of the compressor is maintained unchanged. The second electronic expansion valve is installed at the input end of the first internal heat exchanger.

[0042] Optionally, in response to the frost protection stop command of the first internal heat exchanger, the initial opening value of the second electronic expansion valve is set to the first opening value, and the closed-loop control of the second electronic expansion valve is resumed.

[0043] The control strategy is safe in theory, but in actual application, due to the influence of various unpredictable factors, such as the contradiction between the effective time of each control command and the delay characteristics during execution, the phenomenon of frost formation on the first internal heat exchanger may still occur in extreme cases. After the sensor detects the frost, the frost protection is started immediately, the heat exchange of the first internal heat exchanger is stopped, and the dehumidification is continued after defrosting to avoid the dangerous situation of damage to the first internal heat exchanger caused by frost / ice formation on the first internal heat exchanger, thereby improving the stability and safety of the heat pump system.

[0044] In one implementation, whether to enter the first dehumidification mode is determined according to the dehumidification load, the external environment temperature, and the load threshold value, comprising:

[0045] If the dehumidification load is greater than or equal to the load threshold value, and the external environment temperature is less than or equal to the first temperature threshold value, it is determined that the first dehumidification mode is entered.

[0046] In one implementation, whether to enter the first dehumidification mode is determined according to the dehumidification load, the external environment temperature, and the load threshold value, further comprising:

[0047] If the dehumidification load is less than the load threshold value, or the external environment temperature is greater than or equal to the second temperature threshold value, it is determined to enter the second dehumidification mode, and in the second dehumidification mode, the heat of the battery cooling circuit or the heat of the heating device is used to supplement and heat the air flowing through the first internal heat exchanger.

[0048] Optionally, after it is determined to enter the second dehumidification mode, the method further includes:

[0049] Obtaining the water temperature of the battery cooling circuit in the cooling liquid circulation system;

[0050] According to the water temperature and the target outlet air temperature of the outlet, it is determined whether the battery waste heat meets the heat supplement requirement;

[0051] If yes, the corresponding electronic expansion valve is controlled to guide the cooling liquid of the battery cooling circuit into the warm air core, and the warm air core is used to supplement and heat the air flowing through the first internal heat exchanger through the cooling liquid;

[0052] If no, the heating device is started to heat the cooling liquid flowing through the warm air core.

[0053] When the external environment cannot provide sufficient heat, heat is absorbed from the heating device in the vehicle to supplement and heat for dehumidification, and the waste heat in the battery cooling liquid or the driving motor or engine cooling liquid is preferentially selected for heat supplement, so as to realize the recycling management of heat energy, and when the waste heat still cannot meet the requirement, the self energy is used for heating, so as to reduce the energy consumption as much as possible under the condition of ensuring the dehumidification effect, so as to use more energy for driving the vehicle to travel and improve the driving mileage of the new energy vehicle.

[0054] In a second aspect, the application discloses a control device of a dehumidification mode, which includes:

[0055] An obtaining module is configured to obtain a dehumidification load of a heat pump system and an external environment temperature when it is detected that the passenger compartment has a dehumidification requirement, and the heat pump system includes an external heat exchanger and a first internal heat exchanger;

[0056] A processing module is configured to:

[0057] According to the dehumidification load, the external environment temperature and a load threshold value, it is determined whether to enter a first dehumidification mode, and the first dehumidification mode is used to supplement and heat the air flowing through the first internal heat exchanger through the external heat exchanger to absorb the heat of the external environment in the dehumidification process;

[0058] If yes, the control instruction of the first dehumidification mode is determined according to the air temperature at the plurality of first preset positions in the heat exchange box and the supercooling degree of the heat exchange medium at the at least one second preset position in the transmission pipeline, the first preset positions including the air outlet and the air outlet side of the first internal heat exchanger;

[0059] The control instruction is outputted so that the first target temperature and the second target temperature simultaneously satisfy the preset requirement of the dehumidification function, the first target temperature including the air temperature of the air outlet, and the second target temperature being the air temperature of the air outlet side.

[0060] In a third aspect, the present application discloses an electronic device, including: a processor, and a memory connected with the processor in communication;

[0061] The memory stores computer execution instructions;

[0062] The processor executes the computer execution instructions stored in the memory to implement any one of the possible methods in the first aspect.

[0063] In a fourth aspect, the present application discloses a computer readable storage medium, the computer readable storage medium storing computer execution instructions, the computer execution instructions being executed by the processor to implement any one of the possible methods in the first aspect.

[0064] In a fifth aspect, the present application discloses a computer program product, including a computer program, the computer program being executed by the processor to implement any one of the possible methods in the first aspect.

[0065] In a sixth aspect, the present application discloses a computer program, including program codes, the program codes being executed by the computer to implement any one of the possible methods in the first aspect.

[0066] In combination with the above technical solution, the application provides a control method, device, equipment, medium and program product of a dehumidification mode, wherein when it is detected that the passenger compartment has a dehumidification demand, the dehumidification load of a heat pump system and the external environment temperature are obtained, the heat pump system comprising an external heat exchanger and a first internal heat exchanger; then, whether to enter a first dehumidification mode is judged according to the dehumidification load, the external environment temperature and a load threshold value, the first dehumidification mode being used for: in a dehumidification process, the heat of the external environment is absorbed by the external heat exchanger to heat and warm up the air flowing through the first internal heat exchanger; if yes, the control instruction of the first dehumidification mode is determined according to the air temperature at a plurality of first preset positions in the heat exchange box and the supercooling degree of the heat exchange medium at at least one second preset position in the transmission pipeline; and the control instruction is outputted, so that the first target temperature and the second target temperature simultaneously satisfy the preset requirement of the dehumidification function. The technical problem of how to dehumidify the new energy vehicle is solved, the heat of the external environment is actively absorbed to heat the dehumidified air, and the technical effects of saving energy, improving the stability and safety of the system are achieved. BRIEF DESCRIPTION OF DRAWINGS

[0067] Figure 1 A structural schematic diagram of a vehicle-mounted heat pump system is provided for the application;

[0068] Figure 2 A flowchart of a control method of a dehumidification mode is provided for the embodiment of the application;

[0069] Figure 3 A flowchart of another control method of a dehumidification mode is provided for the embodiment of the application;

[0070] Figure 4 A structural schematic diagram of a control device of a dehumidification mode is provided for the embodiment of the application;

[0071] Figure 5 A structural schematic diagram of an electronic device is provided for the embodiment of the application. DETAILED DESCRIPTION

[0072] To make the objectives, technical solutions and advantages of the embodiments of the application clearer, the technical solutions in the embodiments of the application will be described below in connection with the drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without any creative work, including but not limited to the combination of multiple embodiments, all belong to the protection scope of the application.

[0073] The terms "first", "second", "third", "fourth" etc. (if any) in the description and claims of this application and the above figures are used for distinguishing between similar objects, not necessarily for describing a particular sequential or chronological order. It is to be understood that the use of such terms as "first", "second" and "third" etc. in the description and claims of this application is merely to identify features of similar nature, and is not a characterization of the relative importance of the elements identified with such descriptors. It is also to be understood that the placement of the terms "first", "second", "third", "fourth" etc. in the description and claims of this application has no bearing on the recitations and amounts to no admission that any or all of the elements so described are in any particular order or sequence. It is also to be understood that the use of the descriptive term "first", "second", "third", "fourth" etc. in the description and claims of this application does not require that these elements be in any particular order or sequence, unless expressly stated otherwise. Moreover, the terms "comprise", "comprising", "have", "having", "include", "including", "contain", "containing", "provide", "providing", and any variations thereof in the description and claims of this application are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises, has, includes, contains, or provides any element or a combination of elements can include additional elements not expressly listed or inherent to such process, method, article, or apparatus. Any reference in the description and claims of this application to "one embodiment" or "an embodiment" means that a particular element described in connection with the embodiment is included in at least one embodiment of the application; many modifications are possible in an embodiment of the application other than those described.

[0074] First, the terms related to the present application are explained:

[0075] PTC (Positive Temperature Coefficient) heater: composed of PTC ceramic heating element and aluminum pipe. This type of PTC heating element has the advantages of small thermal resistance and high heat exchange efficiency, and is an automatic constant temperature, power saving electric heater. The outstanding feature is safety performance, which will not cause the surface "red" phenomenon of electric heating tube type heater in any application, thereby causing burns, fire and other safety hazards.

[0076] The dehumidification principle of the passenger cabin in the vehicle is that water vapor condenses into water droplets when it encounters cold. The specific process is: the pressurized refrigerant is delivered to the condenser by the compressor to be condensed and heat is released, then the refrigerant is input into the evaporator through the electronic expansion valve, the refrigerant evaporates and absorbs heat in the evaporator, thereby reducing the temperature of the evaporator, and then the refrigerant is returned to the compressor. The vehicle-mounted air blower blows the air in the vehicle to the low-temperature evaporator, and the water vapor in the air in the vehicle condenses and precipitates when it encounters cold, thereby achieving the purpose of refrigeration and dehumidification. Due to the refrigeration effect of the vehicle-mounted air conditioner, the temperature of the air in the vehicle is continuously lowered, resulting in a decrease in the dehumidification effect of the above dehumidification process. In order to maintain the dehumidification effect, the temperature of the air in the vehicle can be raised by heating the air in the vehicle, so that the dehumidification is carried out in a cycle.

[0077] Compared with traditional vehicles, new energy vehicles have higher requirements for energy management, which makes it important to save energy during dehumidification, and thus becomes an important factor in solving the technical problem of how to control the humidity in the vehicle cabin of new energy vehicles.

[0078] The inventive concept of the present application is:

[0079] The present inventors find that the dehumidification mode in traditional vehicles, which is to cool by the heat pump system of the air conditioner and then to heat by the PTC heater of the cooling liquid circulation system, has large energy consumption, and cannot meet the energy saving requirement of new energy vehicles which have high requirement on energy management. The present inventors find that the heat source for heating the air in the vehicle is a breakthrough for energy saving. Therefore, the present application absorbs heat from the environment outside the vehicle by the external condenser of the heat pump system as one of the sources of the heat source for heating, to replace part of the output power of the compressor work, which requires changing the control method of each component in the heat pump system to achieve the goal of absorbing heat from the environment outside the vehicle for heating.

[0080] The specific application scenario of the present application is:

[0081] Figure 1 The structure diagram of the vehicle-mounted heat pump system provided by the present application is shown in FIG. 1. Figure 1 As shown in FIG. 1, the vehicle-mounted heat pump system includes a compressor 101, an evaporator 102, an internal condenser 103, an external condenser 104, a blower 105, an electronic expansion valve 106, an electronic expansion valve 107, a one-way stop valve 108, a solenoid valve 109, a solenoid valve 110, and an air conditioning box 120, etc.

[0082] The blower 105 sucks the air in the vehicle and blows it to the evaporator 102, so that the water vapor in the air is condensed and precipitated when it is cooled, thereby achieving the purpose of dehumidification. The external condenser 104 in the present application absorbs heat from the environment outside the vehicle by the heat exchange medium, i.e. the refrigerant, in the form of refrigerant evaporation and heat absorption, and then heats the cooled air in the air conditioning box 120 by the action of the internal condenser 103, so as to achieve the purpose of dehumidification in the vehicle. Since the evaporator 102 and the external condenser 104 are connected in parallel, and both of them are in evaporation and heat absorption, this dehumidification mode can also be called parallel dehumidification mode. Although the principle of parallel dehumidification mode is simple, its specific control process is much more complex than the traditional air heating relying on PTC heating device, because the external condenser 104 does not play the role of condensation and heat release as in the traditional air conditioning system, and the refrigerant in the external condenser 104 is evaporated and absorbs heat in the present application, which requires a revolutionary modification of the traditional control strategy to overcome this technical obstacle.

[0083] Because parallel dehumidification needs to meet the target air temperature of the evaporator outflow side and the target outflow temperature of the air outlet at the same time, if control is performed in the traditional manner, although the compressor and the electronic expansion valve have respective control targets, for example, the compressor controls the air outlet temperature and the electronic expansion valve before the evaporator controls the air temperature of the evaporator outflow side, when the compressor controls the air outlet temperature, the air temperature of the evaporator outflow side is affected; when the electronic expansion valve controls the air temperature of the evaporator outflow side, the air outlet temperature is affected. The compressor and the electronic expansion valve are coupled, and if control is not good, system oscillation will inevitably occur, and ultimately the air outlet temperature and the air temperature of the evaporator outflow side cannot be stably controlled.

[0084] The technical solutions of the present application and how the technical solutions of the present application solve the above technical problems will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes can not be described again in some embodiments. The embodiments of the present application will be described below with reference to the drawings.

[0085] Figure 2 A flowchart of a control method of a dehumidification mode provided by an embodiment of the present application is shown in FIG. 1. As shown in FIG. 1, the specific steps of the control method of the dehumidification mode include: Figure 2

[0086] S201, when it is detected that the passenger compartment has a dehumidification demand, obtaining the dehumidification load of the heat pump system and the external environment temperature.

[0087] In this step, the dehumidification demand of the passenger compartment includes that the humidity of the passenger compartment is out of the optimal humidity range (for example, 50% to 70%), the dehumidification function is manually turned on, and the control of the heat pump system has an effect equivalent to dehumidification.

[0088] Specifically, when the humidity sensor in the vehicle detects that the air humidity in the vehicle is greater than 70%, the vehicle central controller automatically issues an initial start instruction.

[0089] Alternatively, when the user manually presses the dehumidification button or clicks the dehumidification control on the touch screen, a dehumidification start instruction is issued.

[0090] In this step, the dehumidification load of the heat pump system is obtained, including:

[0091] Obtaining the passenger compartment temperature, the internal circulation percentage, the external circulation percentage, and the air volume of the air blower;

[0092] Using a preset load model, the dehumidification load is determined according to the preset standard value of the first target temperature, the external environment temperature, the external circulation percentage, the passenger compartment temperature, the internal circulation percentage, and the air volume of the air blower.

[0093] For example, the preset load model can be represented as:​

[0094] Dehumidification load = (target air outlet temperature - actual air inlet temperature) * air volume of the air blower * specific heat of air.

[0095] Wherein, the actual air inlet temperature = external environment temperature * external circulation percentage + passenger cabin temperature * internal circulation percentage.

[0096] Obtaining the external environment temperature, comprising:

[0097] Obtaining the air temperature in the current driving environment of the vehicle through at least one temperature sensor installed outside the vehicle;

[0098] Alternatively, through wireless communication, determining the air temperature in the preset geographical range to which the current driving position belongs as the external environment temperature from the roadbed unit or the big data platform according to the current positioning information (such as the positioning information of Global Positioning System, GPS).

[0099] S202, judging whether to enter the first dehumidification mode according to the dehumidification load, the external environment temperature and the load threshold.

[0100] In this step, the first dehumidification mode is used to: in the dehumidification process, the heat absorbed by the external heat exchanger from the external environment is used to heat and warm the air flowing through the first internal heat exchanger. When the dehumidification load is greater than or equal to the load threshold, and the external environment temperature exceeds the preset temperature threshold, that is, the external environment can provide sufficient heat energy, the first dehumidification mode can be entered.

[0101] In this embodiment, the heat pump system includes an external heat exchanger, a first internal heat exchanger, a second internal heat exchanger, and a heat exchange medium (also known as refrigerant, coolant) circulating along a parallel circulation path.

[0102] The parallel circulation path includes: a heat absorption path, a refrigeration path, and a heat supplement path, the heat absorption path and the refrigeration path are connected in parallel, and then connected in series with the heat supplement path; the external heat exchanger is located on the heat absorption path, the first internal heat exchanger is located on the refrigeration path, and the second internal heat exchanger is located on the heat supplement path, and the second internal heat exchanger is used to transfer the heat absorbed by the external heat exchanger from the external environment to the air flowing through the first internal heat exchanger.

[0103] In this embodiment, as shown in Figure 1 , the external heat exchanger is an external condenser 104, the first internal heat exchanger is an evaporator 102, and the second internal heat exchanger is an internal condenser 103.

[0104] As shown in Figure 1As shown, the heat absorption path is between points A and D, the refrigeration path is between points B and D, and the heat supplement path is between points C and D. The input ends of the heat absorption path and the refrigeration path are connected to the output end of the heat supplement path, and the output ends of the heat absorption path and the refrigeration path are connected to the input end of the heat supplement path. The heat exchange medium, i.e., the refrigerant, of the heat absorption path and the refrigeration path is common low pressure.

[0105] By taking the compressor 101 as the start / stop point of the parallel circulation path, the parallel heat absorption path and the refrigeration path meet at the compressor 101, forming the characteristics of the common low pressure of the external heat exchanger and the first internal heat exchanger, and the two simultaneously perform evaporation heat absorption. The external heat exchanger absorbs the heat of the external environment, and the first internal heat exchanger absorbs the heat of the air in the passenger compartment, so that the water vapor in the air in the passenger compartment condenses and precipitates when cooled, achieving the purpose of refrigeration and dehumidification. Further, the second internal heat exchanger is used to heat and warm the air blown by the air blower to the first internal heat exchanger after condensation and dehumidification, so as to avoid the adverse effects of continuously lowering the temperature of the first internal heat exchanger to eventually cause the first internal heat exchanger to freeze / frost.

[0106] S203, if yes, determining a control instruction of the first dehumidification mode according to air temperatures at a plurality of first preset positions in the heat exchange box and a supercooling degree of the heat exchange medium at at least one second preset position in the transmission pipeline.

[0107] In this step, the first preset positions include the air outlet and the air outlet side of the installation position of the first internal heat exchanger, and the corresponding air temperatures include the first target temperature and the second target temperature. The first target temperature includes the air temperature at the air outlet, and the second target temperature is the air temperature on the air outlet side of the installation position of the first internal heat exchanger. The second preset position includes the output end of the second internal heat exchanger in the transmission pipeline of the heat exchange medium, and the corresponding supercooling degree includes the target supercooling degree of the output end.

[0108] In this embodiment, the first closed-loop control instruction of the compressor is determined according to the first target temperature and a first closed-loop control model;

[0109] The second closed-loop control instruction of the first electronic expansion valve is determined according to the target supercooling degree and a second closed-loop control model, and the first electronic expansion valve is installed at the output end of the second internal heat exchanger.

[0110] The third closed-loop control instruction of the second electronic expansion valve is determined according to the third temperature and a third closed-loop control model, and the second electronic expansion valve is installed at the input end of the first internal heat exchanger.

[0111] It should be noted that the types of the first, second, and third closed-loop control models include: PI (Proportion Integral) model, PID (Proportion Integral Differential) model, etc. Those skilled in the art can select the appropriate model and control parameters of each closed-loop control model according to the actual application scenario.

[0112] S204, Output control command to ensure that the first target temperature and the second target temperature simultaneously meet the preset requirements of the dehumidification function.

[0113] In this step, the first target temperature includes the air temperature at the air outlet of the heat exchange box, and the second target temperature is the temperature of the first internal heat exchanger.

[0114] Specifically, corresponding closed-loop control commands are sent to the compressor, the first electronic expansion valve, and the second electronic expansion valve, respectively.

[0115] like Figure 1 As shown, electronic expansion valves 109 and 110 are opened to open the parallel circulation path. Then, a first closed-loop control command is sent to compressor 101, a second closed-loop control command is sent to the first electronic expansion valve (i.e., electronic expansion valve 106), and a third closed-loop control command is sent to the second electronic expansion valve (i.e., electronic expansion valve 107).

[0116] The compressor 101 controls the air temperature at the outlet of the air conditioning unit 120, ensuring that the air temperature at the outlet reaches the target outlet temperature. The first electronic expansion valve, i.e., electronic expansion valve 106, controls the subcooling of the second internal heat exchanger, i.e., the internal condenser 103, allowing the refrigerant to operate at a higher efficiency and without refrigerant flow noise. The second electronic expansion valve, i.e., electronic expansion valve 107, controls the air temperature on the outlet side of the evaporator 102, ensuring that this temperature reaches the target air temperature. The combined effect of these three mechanisms ensures that both the first and second target temperatures simultaneously meet the preset requirements.

[0117] The preset requirements include: the first target temperature cannot be lower than the first preset target value, and the second target temperature cannot be lower than the second preset target value. This is because if the first target temperature is too low, the air temperature inside the vehicle will drop too quickly, affecting the subsequent condensation and dehumidification effect. This is because a decrease in air temperature requires a continuous decrease in the temperature of the evaporator 102 to achieve condensation and dehumidification; however, continuous cooling of the evaporator 102 will cause frost or ice formation, leading to damage. Therefore, to ensure continuous dehumidification, both the first and second target values ​​must be controlled simultaneously. These two values ​​are inextricably linked.

[0118] Optionally, a plurality of control threads can be provided to separately control the compressor, the first electronic expansion valve and the second electronic expansion valve in a closed loop.

[0119] Based on the above technical content, when the humidity in the passenger cabin exceeds the optimal humidity range, or the dehumidification function is manually turned on, or the control of the heat pump system has the same effect as dehumidification, first, the ambient temperature inside and outside the vehicle is obtained through various on-board sensors, and then the dehumidification load of the heat pump system at the current time is calculated. In addition, the external environment temperature, i.e. the temperature outside the vehicle, reflects whether it is suitable to actively absorb heat from the outside at the current time. When the dehumidification load exceeds the load threshold and the external heat is sufficient, the heat from the external environment is actively absorbed through the external heat exchanger of the heat pump system, and is transferred to the air flowing through the first internal heat exchanger through the heat exchange medium, so that the side effect of the temperature drop in the passenger cabin caused by refrigeration and dehumidification is balanced or improved, achieving the purpose of maintaining the optimal dehumidification effect. At the same time, the natural heat of the external environment replaces part of the output power of the compressor, saving the energy consumption of the vehicle. In this process, the control of the first target temperature at the air outlet and the second target temperature of the first internal heat exchanger (such as the evaporator) is related to the stability and safety of the entire heat pump system. In the prior art, it is difficult to balance the two, often causing oscillation and noise of the heat pump system. However, through multi-stage temperature monitoring and closed-loop regulation in the heat exchange box, combined with closed-loop control of the supercooling degree of the heat exchange medium at the key position, and keeping the air temperature at the air outlet and the evaporator temperature within their respective safe ranges, the stability and safety problems caused by the heat pump system absorbing external environmental heat to supplement the temperature of the air flowing through the first internal heat exchanger are avoided.

[0120] The embodiment of the application provides a control method of a dehumidification mode, comprising: when detecting that the passenger cabin has a dehumidification demand, obtaining a dehumidification load of a heat pump system and an external environment temperature, the heat pump system comprising an external heat exchanger and a first internal heat exchanger; and then determining whether to enter a first dehumidification mode according to the dehumidification load, the external environment temperature and a load threshold, the first dehumidification mode being used for: in a dehumidification process, absorbing heat from the external environment through the external heat exchanger to heat and raise the temperature of the air flowing through the first internal heat exchanger; if yes, determining a control instruction of the first dehumidification mode according to air temperatures at a plurality of first preset positions in a heat exchange box and a supercooling degree of a heat exchange medium at at least one second preset position in a transmission pipeline; and outputting the control instruction, so that the first target temperature and the second target temperature simultaneously satisfy a preset requirement of a dehumidification function. The technical problem of how to dehumidify a new energy vehicle is solved, heat from the external environment is actively absorbed to heat the dehumidified air, and the technical effects of saving energy and improving the stability and safety of the system are achieved.

[0121] Figure 3 This is a schematic flowchart illustrating another dehumidification mode control method provided in an embodiment of this application.

[0122] like Figure 3 As shown, the specific steps of the control method for this dehumidification mode include:

[0123] S301. When a dehumidification requirement is detected in the passenger compartment, the external ambient temperature, passenger compartment temperature, internal circulation percentage, external circulation percentage, and blower air volume are obtained.

[0124] For a detailed explanation of this step, please refer to step S201, which will not be repeated here.

[0125] S302. Using a preset load model, determine the dehumidification load based on the preset standard value of the first target temperature, the external ambient temperature, the percentage of external circulation, the passenger cabin temperature, the percentage of internal circulation, and the blower air volume.

[0126] In this step, the actual air intake temperature when the blower blows the air in the passenger compartment toward the first internal heat exchanger is first calculated: Actual air intake temperature = external ambient temperature * external circulation percentage + passenger compartment temperature * internal circulation percentage.

[0127] It should be noted that when the vehicle's air conditioning is on, the air circulation includes internal and external circulation. Internal circulation refers to the blower drawing air from the passenger compartment and blowing it into the heat exchange box (air conditioning unit 120). The air is cooled and / or heated by various heat exchangers in the heat exchange box before returning to the passenger compartment through the air outlet, thus forming internal circulation.

[0128] External circulation refers to the process where the blower draws air from outside the vehicle, i.e., the external environment, and blows it into the heat exchange box. The air is cooled and / or heated by various heat exchangers in the heat exchange box before being blown into the vehicle interior, i.e., the passenger compartment, from the air outlet.

[0129] Since there are users such as drivers and passengers in the car, their breathing will consume the oxygen in the car and increase the carbon dioxide concentration. If the internal air circulation is on for a long time, it will cause users to suffer from hypoxia. Therefore, it is necessary to allocate the circulation ratio between internal and external air circulation to avoid hypoxia.

[0130] This means that, in order to ensure accuracy when determining the dehumidification load, it is necessary to first calculate the actual air inlet temperature.

[0131] Then, since the outlet air temperature of the air outlet is different for different dehumidification modes, the dehumidification load will be different. Therefore, in order to meet the initial setting requirements of the first dehumidification mode, it is necessary to calculate the dehumidification load by using the pre-set target outlet air temperature.

[0132] In the embodiment, the calculation model of the dehumidification load is as follows:

[0133] Dehumidification load = (target air outlet temperature - actual air inlet temperature) * air volume of the air blower * specific heat of air.

[0134] S303, determining whether to enter the first dehumidification mode according to the dehumidification load, the external environment temperature, and the load threshold value.

[0135] In this step, if the dehumidification load is greater than or equal to the load threshold value, and the external environment temperature is less than or equal to the first temperature threshold value, it is determined to enter the first dehumidification mode, that is, step S304 is executed.

[0136] If the dehumidification load is less than the load threshold value, and the external environment temperature is greater than or equal to the second temperature threshold value, it is determined to enter the second dehumidification mode, that is, step S315 is executed.

[0137] The first dehumidification mode is used to: in the dehumidification process, the heat of the external environment is absorbed by the external heat exchanger to heat and warm the air flowing through the first internal heat exchanger.

[0138] The second dehumidification mode is used to: in the dehumidification process, the heat of the battery cooling circuit and / or the heat of the heating device is used to heat and warm the air flowing through the first internal heat exchanger, and the second temperature threshold value is greater than the first temperature threshold value. In the first dehumidification mode, the dehumidification requirement cannot be met, or in other words, the temperature of the external environment is too low, and the heat absorbed is not enough to compensate for the temperature drop caused by refrigeration and dehumidification. The heat of other heating devices in the vehicle must be called to supplement the air flowing through the first internal heat exchanger.

[0139] It should be noted that the second temperature threshold value is greater than the first temperature threshold value. That is, when switching the dehumidification mode, the external environment temperature needs to be hysteresis processed, and at this time, the second temperature threshold value = the first temperature threshold value + a preset temperature difference. Optionally, the preset temperature difference is 5 degrees Celsius.

[0140] Optionally, the load threshold value includes: the consumption power of the compressor at the minimum number of revolutions, or a correction value obtained by correcting the consumption power of the compressor at the minimum number of revolutions through a preset correction algorithm.

[0141] S304, determining a first lower limit value of the operation of the second electronic expansion valve according to the external environment temperature and a preset first corresponding relationship.

[0142] In this step, the second electronic expansion valve is installed at the input end of the first internal heat exchanger.

[0143] In the embodiment, as shown in Figure 1 , the first internal heat exchanger is an evaporator 102, and the second electronic expansion valve is an electronic expansion valve 107 before the evaporator 102.

[0144] S305, determining a first upper limit value of the second electronic expansion valve according to the external environment temperature, the passenger cabin temperature, the internal circulation percentage, the external circulation percentage, and the air volume of the air blower by using a preset algorithm.

[0145] In this step, the value of the influence factor is first calculated as follows:

[0146] Influence factor = (external environment temperature * external circulation percentage + passenger cabin temperature * internal circulation percentage) * air volume of air blower

[0147] According to the calculation result of the influence factor and the mapping relationship corresponding to the influence factor, the first upper limit value of the second electronic expansion valve corresponding to the influence factor is determined.

[0148] S306, determining a second upper limit value and a second lower limit value of the first electronic expansion valve according to the external environment temperature and a preset second corresponding relationship.

[0149] In this step, the first electronic expansion valve is installed at the output end of the second internal heat exchanger.

[0150] In this embodiment, as shown in Figure 1 , the first electronic expansion valve is the electronic expansion valve 106, and the second internal heat exchanger is the internal condenser 103, and a one-way check valve 108 for preventing backflow of refrigerant is installed at the output end of the internal condenser 103.

[0151] In steps S304-S306, the upper limit and the lower limit of the opening degree of the first electronic expansion valve and / or the second electronic expansion valve are limited because, under the limitation of the external environment, the heat that can be actively absorbed by the heat pump system is related to the temperature of the external environment. In order to avoid ignoring the objective limitation when the heat pump system is working, constantly increasing or decreasing the opening degree of the electronic expansion valve, causing system oscillation, producing serious noise, or the excessive opening degree fluctuation range makes the electronic expansion valve in some cases the current opening degree and the target opening degree of the control command differ too much, the adjustment time is too long, which also affects the stability of the system, or the adjustment function of the electronic expansion valve has failed after exceeding the upper and lower limits. In order to avoid the controller issuing invalid target opening degree, the upper and lower limits are limited to maintain the stability of the entire heat pump system.

[0152] S307, determining a first closed-loop control instruction of the compressor according to the first target temperature and a first closed-loop control model.

[0153] In this step, the first target temperature includes the air temperature at the air outlet of the heat exchange box.

[0154] S308, determining a second closed-loop control instruction of the first electronic expansion valve according to the target supercooling degree and a second closed-loop control model.

[0155] In this step, the target supercooling degree includes the supercooling degree of the heat exchange medium, i.e., the refrigerant, at the output end of the second internal heat exchanger.

[0156] S309, determining a third closed-loop control instruction of the second electronic expansion valve according to the third temperature and a third closed-loop control model.

[0157] In this step, the third temperature includes the air temperature at the air outlet side of the installation position of the first internal heat exchanger in the heat exchange box.

[0158] S310, outputting the first closed-loop control instruction, the second closed-loop control instruction and the third closed-loop control instruction to the compressor, the first electronic expansion valve and the second electronic expansion valve respectively, so that the first target temperature and the second target temperature simultaneously meet the preset requirements of the dehumidification function.

[0159] In this step, the second target temperature is the temperature of the first internal heat exchanger.

[0160] In steps S307-S310, the outlet temperature is controlled by the compressor in a closed loop. Compared with the prior art in which the compressor is used to control the temperature at the air outlet side of the installation position of the first internal heat exchanger, i.e., the second target temperature, the present application uses the compressor to control the outlet temperature, i.e., the first target temperature, which is easier to achieve stable control. Thus, the technical obstacle of simultaneous stable control of the first target temperature and the second target temperature is overcome, and the problem of oscillation of the heat pump system caused by the prior art is avoided.

[0161] S311, obtaining a pressure value at the input end of the compressor.

[0162] In this step, when the first dehumidification mode is executed, the heat exchange medium in the heat exchange medium in the heat exchange medium in the parallel heat supplement path and cooling path has a common low pressure value after evaporation, and a pressure sensor is installed at the input end of the compressor to supervise the pressure value in real time.

[0163] S312, if the pressure value is less than a first pressure threshold value, suspending the output of the second closed-loop control instruction of the first electronic expansion valve, and switching to increasing the opening degree of the first electronic expansion valve at a preset rate until the pressure value is greater than or equal to a second pressure threshold value, and then resuming the output of the second closed-loop control instruction.

[0164] In this step, if the pressure value at the low pressure end of the compressor is less than the first pressure threshold value, the closed-loop control of the supercooling degree of the first electronic expansion valve is suspended, and the opening degree of the first electronic expansion valve is increased at a preset rate (such as 0.1% / S), while the pressure value is detected in real time to determine whether it returns to the second pressure threshold value. If it returns, the closed-loop control of the first electronic expansion valve is continued.

[0165] By controlling the pressure of the low-pressure end, the imbalance of the heat pump system pressure is prevented, which is easy to cause system oscillation in the way of parallel dehumidification. In order to improve safety, reduce oscillation or prevent oscillation beyond the adjustment capacity of the system, monitoring the low-pressure end pressure value is an effective measure to prevent oscillation found by the inventor. Since there is a certain delay in the calculation and execution of the control command, the low-pressure end pressure value below the first pressure threshold value means that the delay may cause the working state of the entire system to exceed the adjustment capacity of the system in the first dehumidification mode, or the closed-loop control is too fast, and the system state cannot keep up in time. At this time, the closed-loop control is suspended to wait for the low-pressure end pressure to recover before continuing to adjust, so that the stability of the system is further guaranteed.

[0166] S313, in response to the frost protection opening instruction of the first internal heat exchanger, closing the second electronic expansion valve, recording the first opening value of the second electronic expansion valve before closing, and maintaining the compressor speed unchanged, the second electronic expansion valve is installed at the input end of the first internal heat exchanger.

[0167] S314, in response to the frost protection closing instruction of the first internal heat exchanger, setting the initial opening value of the second electronic expansion valve to the first opening value, and restoring the closed-loop control of the second electronic expansion valve.

[0168] For steps S313 and S314, although the control strategy of the first dehumidification mode is safe in theory, in actual process, due to the influence of various unpredictable factors, such as the contradiction between the effective time and the delay characteristics of the execution of the control command, the phenomenon of frost formation of the first internal heat exchanger may still occur in extreme cases. After the sensor detects the frost, the frost protection is started immediately, the heat exchange of the first internal heat exchanger is stopped, and the dehumidification is continued after defrosting to avoid the dangerous situation of damage of the first internal heat exchanger caused by frost / ice formation of the first internal heat exchanger, and improve the stability and safety of the heat pump system.

[0169] It should be noted that S312-S314 and S307-S310 have no sequence requirement, and can be understood as being controlled by parallel threads.

[0170] The following steps are steps in the second dehumidification mode:

[0171] S315, obtaining the water temperature of the battery cooling circuit in the cooling liquid circulation system.

[0172] In this step, in addition to the heat pump system, the vehicle-mounted thermal management system also has a cooling liquid circulation system for thermal management of power equipment such as power batteries, motors, engines, etc. Since the power equipment generates a large amount of heat when running, the cooling liquid circulation system generally cools it and discharges heat to the external environment. The water temperature of the battery cooling circuit can be obtained through the temperature sensor at the preset position on the cooling liquid pipeline.

[0173] S316, according to the water temperature and the target air outlet temperature of the air outlet, it is judged whether the battery waste heat meets the heating requirement.

[0174] In this step, the temperature difference between the water temperature and the target air outlet temperature of the air outlet indicates the heat transfer direction, and according to the specific heat capacity of the cooling liquid, it can be determined whether the heat in the battery cooling circuit meets the dehumidification and heating requirement. If yes, step S317 is executed, and if no, step S318 is executed.

[0175] S317, control the corresponding electronic expansion valve to guide the cooling liquid of the battery cooling circuit to the heater core for heating the passenger compartment.

[0176] In this embodiment, the heater core is used to heat and warm up the passenger compartment by the cooling liquid. The heater core can be installed in the heat exchange box to heat the air before the air outlet.

[0177] S318, turn on the heating device to heat the cooling liquid flowing through the heater core.

[0178] In this step, the heating device includes a PTC heater, which heats the cooling liquid, and then heats the air in the heat exchange box when the cooling liquid flows through the heater core.

[0179] For steps S315-S318, when the external environment cannot provide sufficient heat, the heat absorbed from the heat generating equipment in the vehicle is selected to dehumidify and heat, the residual heat in the battery cooling or the driving motor or engine cooling liquid is preferentially selected to heat, the heat energy is recycled and managed, when the residual heat still cannot meet the requirement, the self energy is used for heating, to reduce the energy consumption as much as possible under the condition of ensuring the dehumidification effect, so as to use more energy for driving the vehicle to travel and improve the driving range of the new energy vehicle.

[0180] The embodiment of the present application provides a control method of a dehumidification mode, comprising the following steps: when detecting that the passenger cabin has a dehumidification demand, obtaining a dehumidification load of a heat pump system and an external environment temperature, the heat pump system comprising an external heat exchanger and a first internal heat exchanger; then, judging whether to enter a first dehumidification mode according to the dehumidification load, the external environment temperature and a load threshold value, the first dehumidification mode being used for: in a dehumidification process, absorbing heat of the external environment through the external heat exchanger to heat and warm up the air flowing through the first internal heat exchanger; if yes, determining a control instruction of the first dehumidification mode according to air temperatures at a plurality of first preset positions in the heat exchange box and a supercooling degree of the heat exchange medium at at least one second preset position in the transmission pipeline; and outputting the control instruction, so that the first target temperature and the second target temperature simultaneously satisfy preset requirements of a dehumidification function. The technical problem of how to dehumidify the new energy vehicle is solved, the heat of the external environment is actively absorbed to heat and warm up the air after dehumidification, and the technical effects of saving energy, improving the stability and safety of the system are achieved.

[0181] Figure 4 A structural diagram of a control device of a dehumidification mode provided by the embodiment of the present application. The image processing device 400 can be realized by software, hardware or a combination of both.

[0182] As shown in the figure, the image processing device 400 comprises: Figure 4

[0183] The acquisition module 401 is configured to, when detecting that the passenger cabin has a dehumidification demand, acquire a dehumidification load of a heat pump system and an external environment temperature, the heat pump system comprising an external heat exchanger and a first internal heat exchanger;

[0184] The processing module 402 is configured to:

[0185] Judge whether to enter a first dehumidification mode according to the dehumidification load, the external environment temperature and a load threshold value, the first dehumidification mode being used for: in a dehumidification process, absorbing heat of the external environment through the external heat exchanger to heat and warm up the air flowing through the first internal heat exchanger;

[0186] If yes, determine a control instruction of the first dehumidification mode according to air temperatures at a plurality of first preset positions in the air transmission heat exchange box and a supercooling degree of the heat exchange medium at at least one second preset position in the transmission pipeline, the first preset positions comprising an air outlet and an air outlet side of a position where the first internal heat exchanger is located;

[0187] Output the control instruction, so that the first target temperature and the second target temperature simultaneously satisfy preset requirements of a dehumidification function, the first target temperature comprising an air temperature at the air outlet, and the second target temperature being an air temperature of the air outlet side of the position where the first internal heat exchanger is located. ​

[0188] In a possible design, the control instructions include closed-loop control instructions for respectively performing closed-loop control on each controlled object in the heat pump system, and the role of the controlled object includes causing the heat exchange medium to circulate in the transmission pipeline along a parallel circulation path, the parallel circulation path including: a heat absorption path, a refrigeration path, and a heat supplement path, the heat absorption path being connected in parallel with the refrigeration path and then connected in series with the heat supplement path; the external heat exchanger is located on the heat absorption path, the first internal heat exchanger is located on the refrigeration path, and the heat pump system further includes a second internal heat exchanger, the second internal heat exchanger being located on the heat supplement path, and the second internal heat exchanger is configured to transfer heat absorbed by the external heat exchanger to air flowing through the first internal heat exchanger.

[0189] In a possible design, the first preset position includes an air outlet and an air outlet side of a mounting position of the first internal heat exchanger, and the corresponding air temperature includes the first target temperature and a third target temperature, the third target temperature being an air temperature of the air outlet side, the second preset position includes an output end of the second internal heat exchanger, and the corresponding supercooling degree includes a target supercooling degree of the output end.

[0190] Correspondingly, the processing module 402 is configured to determine a first closed-loop control instruction of the compressor according to the first target temperature and a first closed-loop control model.

[0191] According to the target supercooling degree and a second closed-loop control model, a second closed-loop control instruction of the first electronic expansion valve is determined, and the first electronic expansion valve is installed at the output end of the second internal heat exchanger.

[0192] According to the third temperature and a third closed-loop control model, a third closed-loop control instruction of the second electronic expansion valve is determined, and the second electronic expansion valve is installed at the input end of the first internal heat exchanger.

[0193] In a possible design, the acquisition module 401 is configured to acquire the passenger cabin temperature, the internal circulation percentage, the external circulation percentage, and the air volume of the air blower.

[0194] The processing module 402 is configured to determine a dehumidification load according to a preset standard value of the first target temperature, the external environment temperature, the external circulation percentage, the passenger cabin temperature, the internal circulation percentage, and the air volume of the air blower by using a preset load model.

[0195] In a possible design, the processing module 402 is further configured to determine a first lower limit value of operation of the second electronic expansion valve according to the external environment temperature and a preset first corresponding relationship, and the second electronic expansion valve is installed at the input end of the first internal heat exchanger.

[0196] The acquisition module 401 is further configured to acquire the passenger cabin temperature, the internal circulation percentage, the external circulation percentage, and the air volume of the air blower.

[0197] The processing module 402 is further configured to determine, by using a preset algorithm, a first upper limit value of the second electronic expansion valve according to the external environment temperature, the passenger compartment temperature, the internal circulation percentage, the external circulation percentage, and the air volume of the air blower, the first upper limit value and the first lower limit value being used to suspend or switch the dehumidification mode of the heat pump system when the external environment temperature exceeds the first temperature range.

[0198] In a possible design, the processing module 402 is further configured to determine, according to the external environment temperature and a preset second correspondence relationship, a second upper limit value and a second lower limit value of the first electronic expansion valve, the first electronic expansion valve being installed at the output end of the second internal heat exchanger, the second upper limit value and the second lower limit value being used to suspend or switch the dehumidification mode of the heat pump system when the external environment temperature exceeds a second temperature range.

[0199] In a possible design, the processing module 402 is further configured to:

[0200] If it is detected that the opening degree of the first electronic expansion valve is the second lower limit value, and the supercooling degree of the output end of the second internal heat exchanger is less than or equal to a preset supercooling degree threshold value within a preset time, the dehumidification mode is switched to a second dehumidification mode, in which the heat of the battery cooling circuit or the heat of the heating device is used to heat and warm up the passenger compartment during the dehumidification process, and the second temperature threshold value is greater than the first temperature threshold value.

[0201] In a possible design, the acquisition module 401 is further configured to acquire a pressure value of the input end of the compressor.

[0202] The processing module 402 is further configured to, if the pressure value is less than a first pressure threshold value, suspend output of the second closed-loop control instruction of the first electronic expansion valve, and switch to increasing the opening degree of the first electronic expansion valve at a preset rate until the pressure value is greater than or equal to a second pressure threshold value, and then resume output of the second closed-loop control instruction, the first electronic expansion valve being installed at the output end of the second internal heat exchanger.

[0203] In a possible design, the processing module 402 is further configured to, in response to a defrosting protection open instruction of the first internal heat exchanger, close the second electronic expansion valve, record a first opening degree value of the second electronic expansion valve before being closed, and maintain the rotation speed of the compressor unchanged, the second electronic expansion valve being installed at the input end of the first internal heat exchanger.

[0204] In a possible design, the processing module 402 is further configured to, in response to a defrosting protection close instruction of the first internal heat exchanger, set an initial opening degree value of the second electronic expansion valve as the first opening degree value, and resume the closed-loop control of the second electronic expansion valve.

[0205] In a possible design, the processing module 402 is configured to determine that the air conditioner enters the first dehumidification mode if the dehumidification load is greater than or equal to the load threshold value and the external environment temperature is less than or equal to the first temperature threshold value.

[0206] In a possible design, the processing module 402 is configured to determine that the air conditioner enters the second dehumidification mode if the dehumidification load is less than the load threshold value or the external environment temperature is greater than or equal to the second temperature threshold value, and the second dehumidification mode is to use heat of the battery cooling loop or heat of the heating device to heat the air flowing through the first internal heat exchanger in the dehumidification process, and the second temperature threshold value is greater than the first temperature threshold value.

[0207] In a possible design, the obtaining module 401 is further configured to obtain a water temperature of the battery cooling loop in the cooling liquid circulation system.

[0208] The processing module 402 is further configured to:

[0209] determine, according to the water temperature and a target outlet air temperature of the outlet, whether the battery waste heat meets the heating requirement;

[0210] if yes, control the corresponding electronic expansion valve to guide the cooling liquid of the battery cooling loop to the warm air core that heats the air flowing through the first internal heat exchanger, and the warm air core is configured to heat the passenger compartment by the cooling liquid;

[0211] if no, turn on the heating device to heat the cooling liquid flowing through the warm air core.

[0212] It is worth noting that, Figure 4 The apparatus provided in the embodiments shown in the specification can perform the method provided in any of the method embodiments described above, and the specific implementation principles, technical features, professional term explanations and technical effects are similar, and will not be repeated here.

[0213] Figure 5 A structural schematic diagram of an electronic device is provided in an embodiment of the present application. As shown in the specification, Figure 5 The electronic device 500 can include at least one processor 501 and a memory 502. Figure 5 It is shown that the electronic device takes one processor as an example.

[0214] The memory 502 is configured to store a program. Specifically, the program can include program code, and the program code includes computer operation instructions.

[0215] The memory 502 can include a high-speed RAM memory, and can also include a non-volatile memory such as at least one disk memory.

[0216] The processor 501 is configured to execute the computer-executable instructions stored in the memory 502, so as to implement the methods in the above method embodiments.

[0217] The processor 501 can be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0218] Optionally, the memory 502 can be independent or integrated with the processor 501. When the memory 502 is independent of the processor 501, the electronic device 500 can further include:

[0219] The bus 503 is configured to connect the processor 501 and the memory 502. The bus can be an industry standard architecture (ISA) bus, a peripheral component (PCI) bus, an extended industry standard architecture (EISA) bus, or the like. The bus can be divided into an address bus, a data bus, a control bus, and the like, but does not mean that there is only one bus or only one type of bus.

[0220] Optionally, in a specific implementation, if the memory 502 and the processor 501 are integrated on a chip, the memory 502 and the processor 501 can communicate through an internal interface.

[0221] The embodiments of the present application further provide a computer readable storage medium, which can include a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes, and specifically, the computer readable storage medium stores program instructions. The program instructions are used for the methods in the above method embodiments.

[0222] The embodiments of the present application further provide a computer program product, which includes a computer program. When the computer program is executed by a processor, the methods in the above method embodiments are implemented.

[0223] The embodiments of the present application further provide a computer program. When the computer program is executed by a processor, the methods in the above method embodiments are implemented.

[0224] The above description is provided as an enabling teaching of the application and is not intended to limit its scope in any way. Any modification of the application in keeping with the spirit thereof that is made within the scope of the application as claimed should be clearly within the scope of the application.

Claims

1. A control method of a dehumidification mode, characterized by, The application relates to a method for controlling a heat pump system in a first dehumidification mode. When detecting a dehumidification demand in a passenger cabin, a dehumidification load of a heat pump system and an external environment temperature are obtained, the heat pump system comprising an external heat exchanger and a first internal heat exchanger; According to the dehumidification load, the external environment temperature and a load threshold, it is determined whether to enter the first dehumidification mode, the first dehumidification mode being used for absorbing heat of the external environment by the external heat exchanger to heat and warm air flowing through the first internal heat exchanger in a dehumidification process; If yes, a control instruction of the first dehumidification mode is determined according to air temperatures at a plurality of first preset positions in a heat exchange box and a supercooling degree of a heat exchange medium at at least one second preset position in a transmission pipeline, the first preset positions comprising an air outlet and an air outlet side of a position where the first internal heat exchanger is located; The control instruction is outputted so that a first target temperature and a second target temperature simultaneously satisfy a preset requirement of a dehumidification function, the first target temperature comprising an air temperature of the air outlet, and the second target temperature being an air temperature of the air outlet side.

2. The control method according to claim 1, characterized by, In the first dehumidification mode, the control instruction comprises a closed-loop control instruction for respectively performing closed-loop control on each controlled object in the heat pump system, and the controlled object is used for circulating the heat exchange medium along a parallel circulation path in the transmission pipeline, the parallel circulation path comprising a heat absorption path, a refrigeration path and a heat supplement path, the heat absorption path being connected in parallel with the refrigeration path and then connected in series with the heat supplement path; The external heat exchanger is located on the heat absorption path, the first internal heat exchanger is located on the refrigeration path, and the heat pump system further comprises a second internal heat exchanger, the second internal heat exchanger being located on the heat supplement path and being used for transferring heat absorbed by the external heat exchanger to air flowing through the first internal heat exchanger.

3. The control method according to claim 2, characterized by, The second preset position comprises an output end of the second internal heat exchanger, and correspondingly, the supercooling degree comprises a target supercooling degree of the output end; The control instruction of the first dehumidification mode is determined according to the air temperatures at the plurality of first preset positions in the heat exchange box and the supercooling degree of the heat exchange medium at the at least one second preset position in the transmission pipeline, and the control instruction comprises: A first closed-loop control instruction of a compressor is determined according to the first target temperature and a first closed-loop control model; A second closed-loop control instruction of a first electronic expansion valve is determined according to the target supercooling degree and a second closed-loop control model, the first electronic expansion valve being installed at the output end of the second internal heat exchanger; A third closed-loop control instruction of a second electronic expansion valve is determined according to the second target temperature and a third closed-loop control model, the second electronic expansion valve being installed at an input end of the first internal heat exchanger.

4. The control method according to claim 1, characterized by, The dehumidification load of the heat pump system is obtained by: Obtaining a passenger cabin temperature, an internal circulation percentage, an external circulation percentage and a blower air volume. Determine the dehumidification load according to the preset load model, the preset standard value of the first target temperature, the outside environment temperature, the outside circulation percentage, the passenger cabin temperature, the inside circulation percentage, and the air volume of the air blower.

5. The control method according to claim 1, characterized by, Before determining the control instruction of the first dehumidification mode according to the air temperature at a plurality of first preset positions in the heat exchange box and the supercooling degree of the heat exchange medium at at least one second preset position in the transmission pipeline, the method further comprises: Determine a first lower limit value of the operation of a second electronic expansion valve according to the outside environment temperature and a preset first corresponding relationship, the second electronic expansion valve being installed at the input end of the first internal heat exchanger; Obtain the passenger cabin temperature, the inside circulation percentage, the outside circulation percentage, and the air volume of the air blower; Determine a first upper limit value of the operation of the second electronic expansion valve according to the outside environment temperature, the passenger cabin temperature, the inside circulation percentage, the outside circulation percentage, and the air volume of the air blower by using a preset algorithm.

6. The control method according to claim 2, characterized by Before determining the control instruction of the first dehumidification mode according to the air temperature at a plurality of first preset positions in the heat exchange box and the supercooling degree of the heat exchange medium at at least one second preset position in the transmission pipeline, the method further comprises: Determine a second upper limit value and a second lower limit value of the operation of a first electronic expansion valve according to the outside environment temperature and a preset second corresponding relationship, the first electronic expansion valve being installed at the output end of the second internal heat exchanger.

7. The control method according to claim 6, characterized by After outputting the control instruction, the method further comprises: If it is detected that the opening degree of the first electronic expansion valve is the second lower limit value and the supercooling degree of the output end of the second internal heat exchanger is less than or equal to a preset supercooling threshold value within a preset time, switch the dehumidification mode to a second dehumidification mode, in which the air flowing through the first internal heat exchanger is heated and warmed by using the heat of the battery cooling circuit or the heat of the heating device.

8. The control method according to claim 3, characterized by, After outputting the control instruction, the method further comprises: Obtain the pressure value of the input end of the compressor; If the pressure value is less than a first pressure threshold value, suspend the output of the second closed-loop control instruction of the first electronic expansion valve and switch to increasing the opening degree of the first electronic expansion valve at a preset rate until the pressure value is greater than or equal to a second pressure threshold value, at which time the output of the second closed-loop control instruction is resumed, the first electronic expansion valve being installed at the output end of the second internal heat exchanger.

9. The control method according to any one of claims 1 to 8, characterized by, After outputting the control instruction, the method further comprises: In response to a defrosting protection start instruction of the first internal heat exchanger, close the second electronic expansion valve, record the first opening degree value of the second electronic expansion valve before being closed, and maintain the rotation speed of the compressor unchanged, the second electronic expansion valve being installed at the input end of the first internal heat exchanger.

10. The control method according to claim 9, characterized by, After closing the second electronic expansion valve and maintaining the rotation speed of the compressor unchanged, the method further comprises: In response to a defrosting protection stop instruction of the first internal heat exchanger, set the initial opening degree value of the second electronic expansion valve to the first opening degree value and resume the closed-loop control of the second electronic expansion valve.

11. The control method according to claim 1, characterized by, The determining whether to enter the first dehumidification mode according to the dehumidification load, the external environment temperature and a load threshold value comprises: If the dehumidification load is greater than or equal to the load threshold value and the external environment temperature is less than or equal to a first temperature threshold value, it is determined to enter the first dehumidification mode.

12. The control method according to claim 11, characterized by, The determining whether to enter the first dehumidification mode according to the dehumidification load, the external environment temperature and a load threshold value further comprises: If the dehumidification load is less than the load threshold value or the external environment temperature is greater than or equal to a second temperature threshold value, it is determined to enter a second dehumidification mode, and in the second dehumidification mode, heat of a battery cooling loop or heat of a heating device is used to heat and raise the temperature of air flowing through the first internal heat exchanger in a dehumidification process, and the second temperature threshold value is greater than the first temperature threshold value.

13. The control method according to claim 12, characterized by, After the determining to enter the second dehumidification mode, further comprising: Obtaining a water temperature of the battery cooling loop in a cooling liquid circulation system; According to the water temperature and a target air outlet temperature of an air outlet, determining whether the battery waste heat meets the heating requirement; If yes, controlling a corresponding electronic expansion valve to guide the cooling liquid of the battery cooling loop into a warm air core body, and the warm air core body is used to heat and raise the temperature of the air flowing through the first internal heat exchanger through the cooling liquid; If no, starting the heating device to heat the cooling liquid flowing through the warm air core body.

14. A control device of a dehumidification mode, characterized by, Comprise: An obtaining module is configured to, when detecting that there is a dehumidification demand in a passenger compartment, obtain a dehumidification load and an external environment temperature of a heat pump system, and the heat pump system comprises an external heat exchanger and a first internal heat exchanger; A processing module is configured to: According to the dehumidification load, the external environment temperature and a load threshold value, determine whether to enter a first dehumidification mode, and the first dehumidification mode is used to heat and raise the temperature of air flowing through the first internal heat exchanger by absorbing heat of an external environment through the external heat exchanger in a dehumidification process; If yes, according to air temperatures at a plurality of first preset positions in a heat exchange box and a supercooling degree of a heat exchange medium at at least one second preset position in a transmission pipeline, determine a control instruction of the first dehumidification mode, and the first preset positions comprise an air outlet and an air outlet side of a position where the first internal heat exchanger is located; Output the control instruction, so that a first target temperature and a second target temperature simultaneously meet a preset requirement of a dehumidification function, the first target temperature comprises an air temperature of the air outlet, and the second target temperature is an air temperature of the air outlet side.

15. An electronic device comprising: A processor and a memory in communication connection with the processor; The memory stores computer execution instructions; The processor executes the computer execution instructions stored in the memory to realize the method in any one of claims 1 to 13.

16. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer execution instructions, and the computer execution instructions are executed by the processor to realize the method in any one of claims 1 to 13.

17. A computer program product comprising a computer program which, when executed by a processor, implements the method of any of claims 1 to 13.

18. A computer program, characterized in that, including program code which, when executed by a computer, performs the method of any of claims 1 to 13.

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