Control Method, Device, Equipment, Medium and Program Product for Dehumidification Mode

Abstract

A method, device (400), equipment (500), medium and program product for controlling a dehumidification mode, which, upon detecting a dehumidification request in a passenger compartment, obtains a dehumidification load of a heat pump system and an external environmental temperature, and judges whether to enter a first dehumidification mode according to the dehumidification load, the external environmental temperature and a load threshold value, which is used to supplement heat to the air flowing through the first internal heat exchanger by absorbing heat from the external environment by the external heat exchanger during dehumidification, thereby increasing the temperature, and when it is judged to enter the first dehumidification mode, determines a control command for the first dehumidification mode according to the air temperatures at a plurality of first predetermined positions in the heat exchange box and the subcooling degree of the heat exchange medium at at least one second predetermined position in the transport pipeline, and then outputs a control command so that the first target temperature and the second target temperature simultaneously meet the predetermined requirements of the dehumidification function. The technical problem of how to dehumidify a new energy vehicle is solved.

Description

Technical Field

[0001] This application relates to the field of new energy vehicle technology, and more specifically, to a control method, device, equipment, medium, and program product for a dehumidification mode.

Background Art

[0002] With the development of vehicle technology, new energy vehicles have already become the main trend of future vehicle development. Although there are many solutions for controlling the passenger compartment in the conventional vehicle field, in new energy vehicles, due to the introduction of high-power consumption drive motors and large-capacity batteries, it will have a new impact on the thermal management of existing vehicles and face new challenges.

[0003] The humidity inside the vehicle is an important indicator in passenger compartment control. How to achieve humidity control inside a new energy vehicle has a great impact on the riding comfort of new energy vehicles and the safety of vehicle systems.

[0004] Therefore, how to control the humidity inside a new energy vehicle is the technical problem to be solved by this application.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The purpose of this application is to provide a control method for the dehumidification mode. By actively absorbing the heat of the vehicle external environment and transferring it to the air inside the passenger compartment, the temperature of the air conditioner outlet during dehumidification can be increased, the temperature of the passenger compartment can be maintained within an appropriate range, the dehumidification effect can be maintained within an optimal range, energy can be saved, and it is no longer necessary to consume the energy of the vehicle itself for heat replenishment during dehumidification.

Means for Solving the Problems

[0006] In a first aspect, this application discloses a control method for a dehumidification mode. When it is detected that there is a dehumidification requirement in the passenger compartment, steps of obtaining the dehumidification load and the external environmental temperature of a heat pump system including an external heat exchanger and a first internal heat exchanger are performed. According to the dehumidification load, the external environmental temperature, and the load threshold, a step of determining whether to enter a first dehumidification mode is performed, which is used to supplement heat to the air flowing through the first internal heat exchanger by absorbing the heat of the external environment by the external heat exchanger during dehumidification to raise the temperature. When it is determined to enter the first dehumidification mode, according to the air temperature at a plurality of first predetermined positions in the air transportation heat exchange box including the air outlet and the blowing side of the position where the first internal heat exchanger is arranged, and the degree of supercooling of the heat exchange medium at at least one second predetermined position in the transportation pipeline, a step of determining the control command of the first dehumidification mode is performed. A step of outputting a control command is included so that a first target temperature including the air temperature at the air outlet and a second target temperature which is the air temperature at the blowing side of the position where the first internal heat exchanger is arranged simultaneously satisfy the predetermined requirements of the dehumidification function.

[0007] Based on the above technical content, when the humidity in the passenger compartment exceeds the optimal humidity range or the dehumidification function is manually activated, first, the environmental temperatures inside and outside the vehicle are obtained by each in-vehicle sensor, and then the current dehumidification load of the heat pump system is calculated. The external environmental temperature, that is, the outside temperature, reflects whether it is currently suitable for actively absorbing heat from the outside. When the dehumidification load exceeds the load threshold and the external heat is sufficient, the heat in the external environment is actively absorbed by the external heat exchanger in the heat pump system, and transferred to the passenger compartment by the heat exchange medium, so that the power output in the dehumidification mode of the compressor is saved and the energy consumption of the vehicle is saved. In this process, the control of the first target temperature at the air outlet and the second target temperature which is the air temperature at the blowing side of the mounting position where the first internal heat exchanger (such as an evaporator) is arranged is related to the stability and safety of the entire heat pump system. In the prior art, it is difficult to achieve both stability and safety, and it often causes vibration and noise of the heat pump system. In contrast, the present application For air transportationIn the heat exchange box, multi-stage temperature monitoring and closed-loop adjustment are performed, which is coordinated with the closed-loop control for the degree of subcooling of the heat exchange medium at important positions, and the air temperature at the air outlet and the air temperature on the blowing side of the mounting position where the evaporator is arranged are each within the safe range, thereby avoiding the stability and safety problems that occur when the heat pump system absorbs heat from the external environment and substitutes part of the output power of the compressor.

[0008] Optionally, the heat pump system further includes a second internal heat exchanger, and the control command includes a closed-loop control command for performing closed-loop control on each of the controlled objects in the heat pump system. The role of the controlled object includes the role of circulating and flowing the heat exchange medium along the parallel circulation path in the transport pipeline. The parallel circulation path includes a heat absorption path, a cooling path, and a heat replenishment path. The heat absorption path is connected in parallel with the cooling path and then connected in series with the heat replenishment path. The external heat exchanger is located on the heat absorption path, the first internal heat exchanger is located on the cooling path, the second internal heat exchanger is located on the heat replenishment 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.

[0009] Taking the compressor as the starting point / stopping point of the parallel circulation path and converging the parallel-connected heat absorption path and cooling path at the compressor, the characteristic that the external heat exchanger and the first internal heat exchanger are both at low pressure is formed. The external heat exchanger and the first internal heat exchanger simultaneously perform evaporation and heat absorption. The external heat exchanger absorbs heat from the external environment, and the first internal heat exchanger absorbs heat from the air in the passenger compartment, thereby cooling and condensing the water vapor in the air in the passenger compartment to generate droplets and achieving the purpose of cooling and dehumidification. Furthermore, in order to avoid the adverse effect of finally icing / frosting the first internal heat exchanger due to the need to continuously lower the temperature of the first internal heat exchanger to maintain the dehumidification effect, the air blown to the first internal heat exchanger by the blower and used for condensation and dehumidification is heat-replenished using the second internal heat exchanger to regain warmth.

[0010] In one embodiment 、No.The predetermined position of 2 includes the output end of the second internal heat exchanger, and accordingly, the degree of subcooling includes the target degree of subcooling at the output end. For air transportation The step of determining the control command for the first dehumidification mode according to the air temperature at a plurality of first predetermined positions in the heat exchange box and the degree of subcooling of the heat exchange medium at at least one second predetermined position in the transport pipeline is Determining a first closed-loop control command for the compressor according to the first target temperature and the first closed-loop control model; Determining a second closed-loop control command for the first electronic expansion valve attached to the output end of the second internal heat exchanger according to the target degree of subcooling and the second closed-loop control model; The The target temperature of No. 2 And determining a third closed-loop control command for the second electronic expansion valve attached to the input end of the first internal heat exchanger according to the third closed-loop control model.

[0011] In the closed-loop control of the temperature at the air outlet using the compressor, compared with the conventional technology of controlling the second target temperature, which is the temperature on the blowing side of the mounting position where the first internal heat exchanger is arranged, using the compressor, in the present application, the first target temperature, which is the temperature at the air outlet, is controlled using the compressor, so that the target of stable control can be more easily achieved. Thereby, the technical problem of simultaneously and stably controlling the first target temperature and the second target temperature is overcome, and the problem existing in the conventional technology that the heat pump system chatters due to the inability to control both simultaneously is avoided.

[0012] In one embodiment, For air transportation Before the step of determining the control command for the first dehumidification mode according to the air temperature at a plurality of first predetermined positions in the heat exchange box and the degree of subcooling of the heat exchange medium at at least one second predetermined position in the transport pipeline, The method is Determining a first lower limit value for the operation of the second electronic expansion valve attached to the input end of the first internal heat exchanger according to the external environmental temperature and a preset first correspondence; Steps to obtain the temperature of the passenger compartment, the percentage of internal circulation, the percentage of external circulation, and the air volume of the blower; Further including the step of determining a first upper limit value for the operation of the second electronic expansion valve according to the external environmental temperature, the temperature of the passenger compartment, the percentage of internal circulation, the percentage of external circulation, and the air volume of the blower using a preset algorithm; The roles of the first upper limit value and the first lower limit value include temporarily stopping or switching the dehumidification mode of the heat pump system when the external environmental temperature exceeds the first temperature range, and restricting the adjustment ability of the first dehumidification mode to ensure the safety and stability of the system.

[0013] In one embodiment, before the step of determining the control command for the first dehumidification mode according to the air temperature at a plurality of first predetermined positions in the heat exchange box for air transportation and the degree of subcooling of the heat exchange medium at at least one second predetermined position in the transportation pipeline; The method is Further including the step of determining a second upper limit value and a second lower limit value for the operation of the first electronic expansion valve attached to the output end of the second internal heat exchanger according to the external environmental temperature and a preset second correspondence relationship; The roles of the second upper limit value and the second lower limit value include temporarily stopping or switching the dehumidification mode of the heat pump system when the external environmental temperature exceeds the second temperature range, and restricting the adjustment ability of the first dehumidification mode to ensure the safety and stability of the system.

[0014] In the above two embodiments, the reasons for restricting the upper and lower limits of the opening degrees of the first electronic expansion valve and / or the second electronic expansion valve are due to the limitations of the external environment. The heat that the heat pump system can actively absorb is related to the temperature of the external environment. Therefore, when the heat pump system is operating, objective limitations are ignored, and the opening degree of the electronic expansion valve continuously increases or decreases, resulting in the system chattering and generating significant noise. This is avoided, or in the case of an overly large opening degree variation range, when the difference between the current opening degree of the electronic expansion valve and the target opening degree according to the control command is too large at a certain time, the adjustment time is too long, which affects the stability of the system. This is avoided, or after the electronic expansion valve exceeds its upper and lower limits, its adjustment function becomes invalid. Therefore, it is to avoid the controller sending an invalid target opening degree, and by restricting its upper and lower limits, the stability of the entire heat pump system is maintained.

[0015] In one embodiment, after the step of outputting a control command, The method is when it is detected that the opening degree of the first electronic expansion valve is at the second lower limit value and the degree of subcooling at the output end of the second internal heat exchanger is below the preset subcooling threshold within a predetermined time, it further includes the step of switching the dehumidification mode to the second dehumidification mode. In the second dehumidification mode, during dehumidification, heat is supplemented to the air flowing through the first internal heat exchanger using the heat of the battery cooling circuit or the heat of the heating device to raise the temperature .

[0016] As is clear from the essence of this embodiment, the first dehumidification mode can no longer meet the dehumidification requirements, or the temperature of the external environment is too low and the heat absorbed is insufficient. Therefore, heat must be scheduled from other heat-generating devices inside the vehicle to supplement the output power of the compressor.

[0017] In one embodiment, after the step of outputting a control command, The method is the step of obtaining the pressure value at the input end of the compressor, and When the pressure value is less than the first pressure threshold, temporarily stop the output of the second closed-loop control command of the first electronic expansion valve attached to the output end of the second internal heat exchanger, and switch to a mode of increasing the opening degree of the first electronic expansion valve at a predetermined speed, and resume the output of the second closed-loop control command until the pressure value is equal to or greater than the second pressure threshold.

[0018] By controlling the pressure at the low-pressure end, the pressure imbalance of the heat pump system is prevented. This is because when the means of parallel dehumidification is adopted according to the prior art, chattering of the system is likely to occur. In order to improve safety, reduce chattering, or prevent the occurrence of chattering exceeding the adjustment ability of the system, monitoring the pressure value at the low-pressure end is a useful means for preventing chattering discovered by the inventor of the present application. Since there is a certain delay in the calculation and execution of the control command, when the pressure value at the low-pressure end is less than the first pressure threshold, due to the influence of this delay, the operating state of the entire system exceeds the adjustment ability of the system in the first dehumidification mode, or the closed-loop adjustment is too fast and the state of the system has not caught up in a timely manner. In this case, if the closed-loop control is temporarily stopped and waiting until the low-pressure end pressure recovers and then the adjustment is resumed, the stability of the system can be further ensured.

[0019] In one embodiment, after the step of outputting the control command, The method is In response to the frosting prevention start command by the first internal heat exchanger, close the second electronic expansion valve attached to the input end of the first internal heat exchanger, and at the same time, record the first opening degree value before the second electronic expansion valve closes, and maintain the rotation speed of the compressor as it is.

[0020] Optionally, in response to the frosting prevention stop command by 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 for the second electronic expansion valve.

[0021] The control method is theoretically safe. However, in actual applications, due to various unpredictable factors such as the conflict between the effective time of each control command and the delay characteristics during execution, the phenomenon that the first internal heat exchanger frosts in extreme cases still exists. After the sensor detects frosting, it immediately starts anti-frosting, stops the heat exchange by the first internal heat exchanger, waits until the frost melts, and then continues dehumidification. In this way, the dangerous situation of damage to the first internal heat exchanger caused by frosting / icing of the first internal heat exchanger is avoided, and the stability and safety of the heat pump system are improved.

[0022] In one embodiment, the step of determining whether to enter the first dehumidification mode according to the dehumidification load, the external environmental temperature, and the load threshold is including the step of determining to enter the first dehumidification mode when the dehumidification load is equal to or greater than the load threshold and the external environmental temperature is equal to or lower than the first temperature threshold.

[0023] In one embodiment, the step of determining whether to enter the first dehumidification mode according to the dehumidification load, the external environmental temperature, and the load threshold is further including the step of determining to enter the second dehumidification mode when the dehumidification load is less than the load threshold or the external environmental temperature is equal to or higher than the second temperature threshold. In the second dehumidification mode, during dehumidification, heat is supplemented to the air flowing through the first internal heat exchanger using the heat of the battery cooling circuit or the heat of the heating device to raise the temperature. The second temperature threshold is greater than the first temperature threshold.

[0024] Optionally, after the step of determining to enter the second dehumidification mode, The method is the step of obtaining the water temperature of the battery cooling circuit in the coolant liquid circulation system and the step of determining whether the waste heat of the battery meets the heat supplement requirement according to the water temperature and the target blowing temperature of the air outlet. When it is determined that the heat replenishment requirement is satisfied, controlling an electronic expansion valve to introduce the coolant of the battery cooling circuit into a heater core that heats the air flowing through the first internal heat exchanger; When it is determined that the heat replenishment requirement is not satisfied, further including starting a heating device and heating the coolant flowing through the heater core; The heater core is used to replenish heat to the air flowing through the first internal heat exchanger and increase the temperature by using the coolant.

[0025] When sufficient heat cannot be provided by the external environment, it is selected to absorb heat from the heating devices inside the vehicle for dehumidification and heat replenishment, prioritize heat replenishment by utilizing the waste heat of the battery cooling, drive motor or engine coolant, and realize the recovery management of thermal energy. However, when the waste heat is not sufficient, heat is generated by using the energy of the vehicle itself, and under the condition that the dehumidification effect can be ensured, the effect of reducing energy consumption as much as possible is achieved. In this way, more energy is available when the vehicle is running, and the driving range of the new energy vehicle is improved.

[0026] In a second aspect, the present application discloses a control device for a dehumidification mode, When it is detected that there is a dehumidification requirement in the passenger compartment an acquisition module for acquiring the dehumidification load and the external environment temperature of a heat pump system including an external heat exchanger and a first internal heat exchanger; determining whether to enter a first dehumidification mode used to replenish heat to the air flowing through the first internal heat exchanger and increase the temperature by absorbing the heat of the external environment by the external heat exchanger during dehumidification according to the dehumidification load, the external environment temperature, and a load threshold; When it is determined to enter the first dehumidification mode, For air transportation determining a control command for the first dehumidification mode according to the air temperature at a plurality of first predetermined positions in the heat exchange box and the degree of subcooling of the heat exchange medium at at least one second predetermined position in the transport pipeline; Output a control command so that the first target temperature including the air temperature at the air outlet and the second target temperature which is the air temperature on the blowing side at the position where the first internal heat exchanger is arranged simultaneously satisfy the predetermined requirements of the dehumidification function. And it is used for the processing module.

[0027] In a third aspect, the present application discloses an electronic device including a processor and a memory communicably connected to the processor. The memory stores computer-executable instructions. When the processor executes the computer-executable instructions stored in the memory, a control method of any one of the possible dehumidification modes in the first aspect is implemented.

[0028] In a fourth aspect, the present application discloses a computer-readable storage medium, on which computer-executable instructions are stored, and when the computer-executable instructions are executed by a processor, they are used to implement any one of the possible methods in the first aspect.

[0029] In a fifth aspect, the present application discloses a computer program product including a computer program, and when the computer program is executed by a processor, any one of the possible methods in the first aspect is implemented.

[0030] In a sixth aspect, the present application discloses a computer program including program code, and when the computer program is run on a computer, the program code executes any one of the possible methods in the first aspect.

Advantages of the Invention

[0031] According to the above technical solution, the present application provides a control method, apparatus, device, medium, and program product for a dehumidification mode. When it is detected that there is a dehumidification requirement in the passenger compartment, the dehumidification load and the external environmental temperature of a heat pump system including an external heat exchanger and a first internal heat exchanger are obtained. Then, according to the dehumidification load, the external environmental temperature, and a load threshold, it is determined whether to enter the first dehumidification mode. The first dehumidification mode is used to supplement heat to the air flowing through the first internal heat exchanger to increase the temperature by absorbing the heat of the external environment by the external heat exchanger during dehumidification. When it is determined to enter the first dehumidification mode, For air transportation According to the air temperature at a plurality of first predetermined positions in the heat exchange box and the degree of subcooling of the heat exchange medium at at least one second predetermined position in the transport pipeline, a control command for the first dehumidification mode is determined. Then, a control command is output so that the first target temperature and the second target temperature simultaneously meet the predetermined requirements of the dehumidification function. The technical problem of how to dehumidify a new energy vehicle is solved. By actively absorbing the heat of the external environment to supplement the heat of the dehumidified air, the technical effect of achieving energy conservation as well as improving the stability and safety of the system is achieved.

Brief Description of the Drawings

[0032]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly and completely describe the technical solutions with reference to the drawings related to the embodiments of this application. Of course, the described embodiments are only a part of the embodiments of this application, not all of them. Those skilled in the art can, without creative efforts based on the embodiments in this application, obtain all other embodiments, which all belong to the protection scope of this application.

[0034] In the specification and claims of this application, and in the above drawings, terms such as "first", "second", "third", "fourth", etc. (if any) are used to distinguish similar objects and do not necessarily explain a specific order or sequence. It should be understood that the data used in this way can be appropriately exchanged so that the embodiments of the invention described in this specification can be implemented in an order other than, for example, those illustrated or described in this specification. Also, the terms "comprising" and "having", and all their variations, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device comprising a series of steps or units does not necessarily have to be limited to the explicitly listed steps or units, and may include other steps or units not explicitly listed or inherent to these processes, methods, products, or devices.

[0035] First, the terms related to this application will be explained.

[0036] A PTC (Positive Temperature Coefficient) heater is composed of a PTC ceramic heating element and an aluminum tube. This type of PTC heating element has the advantages of low thermal resistance and high heat exchange efficiency, and is an electric heater that can automatically maintain a certain temperature and save electricity. Its special feature lies in its safety performance that in any application scenario, there is no need to worry about safety issues such as burns and fires caused by the phenomenon of the surface "turning red" like a tubular electric heater.

[0037] The dehumidification principle of the passenger compartment inside the vehicle is to cool the water vapor and condense it into water droplets. The specific process is as follows. The pressurized refrigerant is transported to the condenser by the compressor for condensation and heat dissipation, and then, by the electronic expansion valve, the refrigerant is fed into the evaporator. The refrigerant evaporates in the evaporator, absorbs heat, and lowers the temperature of the evaporator. After that, the refrigerant is returned to the compressor. When the in-vehicle blower blows air inside the vehicle to the low-temperature evaporator, the air inside the vehicle is cooled. As a result, the water vapor in the air condenses to form droplets, and the purpose of cooling and dehumidification is achieved. Due to the cooling function of the in-vehicle air conditioner, the temperature of the air inside the vehicle continues to drop, so the dehumidification effect of the above dehumidification process will decrease. In order to maintain the dehumidification effect, by replenishing the heat of the air inside the vehicle, the temperature of the air inside the vehicle can be warmed up, and in this way, the dehumidification is circulated.

[0038] Compared with conventional vehicles, new energy vehicles have higher requirements for energy management. Therefore, how to achieve energy conservation during dehumidification is an important influencing factor in solving the technical problem of how new energy vehicles control the humidity inside the vehicle.

[0039] The inventive concept of this application is as follows. The inventor of this application found that in conventional vehicles, the dehumidification means cooled by the heat pump system of the air conditioner and supplemented with heat by the PTC heater of the coolant liquid circulation system has a large energy consumption, so as a new energy vehicle with high requirements for energy management, the requirement of energy conservation cannot be met. The inventor of this application found that the heat source for supplementing heat to the air inside the vehicle is the breakthrough point of energy conservation. Therefore, this application replaces a part of the output power during the operation of the compressor, and adopts a mechanism that absorbs heat from the external environment as one of the heat sources for heat supplementation by the external condenser of the heat pump system. Therefore, in order to achieve the purpose of absorbing heat from the external environment and supplementing heat, it is necessary to change the control method of each component in the heat pump system.

[0040] The specific application scenarios of this application will be described below.

[0041] Figure 1 is a schematic structural diagram of an in-vehicle heat pump system provided by this application. As shown in Figure 1, the in-vehicle 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 check valve 108, a solenoid valve 109, a solenoid valve 110, and an air conditioning box 120, etc.

[0042] Here, the blower 105 sucks in the air inside the vehicle, blows air to the evaporator 102, cools and condenses the water vapor in the air to generate droplets, thereby achieving the purpose of dehumidification. In this application, the external condenser 104 uses a refrigerant as the heat exchange medium. The refrigerant evaporates and absorbs heat to absorb heat from the external environment, and then the internal condenser 103 replenishes heat to the air cooled in the air conditioning box 120 to raise the temperature. By repeating this process, the purpose of in-vehicle dehumidification is achieved. The evaporator 102 and the external condenser 104 are connected in parallel and both perform heat absorption by evaporation, so this dehumidification mode is also called the parallel dehumidification mode. Although the principle of the parallel dehumidification mode is simple, the specific control process has become much more complicated than the conventional means of heating air by PTC heating equipment. This is because the external condenser 104 does not play the role of condensation heat release in the conventional air conditioning system, and in this application, the refrigerant in the external condenser 104 is for heat absorption by evaporation. Therefore, in order to overcome this technical problem, it is necessary to make a drastic change to the conventional control method.

[0043] Parallel dehumidification requires simultaneously meeting the target air temperature on the evaporator outlet side and the target blowing temperature at the outlet. Therefore, if controlled by conventional means, each of the compressor and the electronic expansion valve has its own control target. For example, the compressor controls the temperature at the outlet, and the electronic expansion valve in front of the evaporator controls the air temperature on the evaporator outlet side. However, when the compressor controls the temperature at the outlet, it affects the air temperature on the evaporator outlet side, while when the electronic expansion valve controls the air temperature on the evaporator outlet side, it affects the temperature at the outlet. Since the compressor and the electronic expansion valve are coupled, if not properly controlled, it will cause chattering of the system, and ultimately the blowing temperature and the air temperature on the evaporator outlet side cannot be stably controlled.

[0044] Hereinafter, specific embodiments will be used to describe in detail the technical solution of the present application and how the technical solution of the present application solves the above technical problems. Several of the following specific embodiments may be combined with each other, and in some embodiments, the same or similar concepts or processes may not be described. Hereinafter, the embodiments of the present application will be described with reference to the drawings.

[0045] FIG. 2 is a flowchart of a control method for one dehumidification mode provided by an embodiment of the present application. As shown in FIG. 2, the specific steps of the control method for the dehumidification mode include S201 to S204.

[0046] In S201, when it is detected that there is a dehumidification requirement in the passenger compartment, the dehumidification load of the heat pump system and the external environmental temperature are acquired.

[0047] In this step, the fact that there is a dehumidification requirement in the passenger compartment includes that when the humidity in the passenger compartment exceeds the optimal humidity range (such as 50% - 70%), the dehumidification function is manually activated, and the control of the heat pump system has an effect equivalent to dehumidification.

[0048] Specifically, when the humidity sensor in the vehicle detects that the humidity of the air in the vehicle exceeds 70%, an initial start command is automatically sent from the central control device of the vehicle.

[0049] Alternatively, when the user manually presses the dehumidification button or clicks the dehumidification control on the touch screen, a dehumidification start command is sent.

[0050] In this step, the step of obtaining the dehumidification load of the heat pump system includes the steps of obtaining the temperature of the passenger compartment, the percentage of internal circulation, the percentage of external circulation, and the air volume of the blower, and using a preset load model to determine the dehumidification load according to a predetermined reference value of the first target temperature, the external environmental temperature, the percentage of external circulation, the temperature of the passenger compartment, the percentage of internal circulation, and the air volume of the blower.

[0051] For example, the preset load model can be expressed by the formula dehumidification load = (target blowing temperature - actual blowing temperature) * air volume of the blower * specific heat of air.

[0052] Here, let the actual blowing temperature = external environmental temperature * percentage of external circulation + temperature of the passenger compartment * percentage of internal circulation.

[0053] The step of obtaining the external environmental temperature includes the step of obtaining the air temperature in the current driving environment of the vehicle by at least one temperature sensor mounted outside the vehicle, or using wireless communication means to determine, according to the current positioning information of the vehicle ( All positioning information of the global positioning system (Global Positioning System, GPS) etc.), the air temperature within a preset geographical range to which the current driving position belongs from a road infrastructure unit or a big data platform as the external environmental temperature.

[0054] In S202, it is determined whether to enter the first dehumidification mode according to the dehumidification load, the external environmental temperature, and the load threshold.

[0055] In this step, the first dehumidification mode is used to supplement heat to the air flowing through the first internal heat exchanger and raise the temperature by absorbing the heat of the external environment by means of the external heat exchanger during dehumidification. When the dehumidification load reaches or exceeds the load threshold value and the external environmental temperature exceeds the predetermined temperature threshold value, that is, when sufficient heat can be supplied in the external environment to supplement the energy, the first dehumidification mode can be entered.

[0056] 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 called a coolant or refrigerant) that circulates and flows along a parallel circulation path.

[0057] The parallel circulation path includes a heat absorption path, a cooling path, and a heat supplement path. The heat absorption path is connected in parallel with the cooling 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 cooling path, 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 from the external environment by the external heat exchanger to the air flowing through the first internal heat exchanger.

[0058] In this embodiment, as shown in FIG. 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.

[0059] As shown in FIG. 1, the heat absorption path is between points A and D, the cooling 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 cooling path are connected to the output end of the heat supplement path, and the output ends of the heat absorption path and the cooling path are connected to the input end of the heat supplement path. Also, the refrigerant, which is the heat exchange medium of the heat absorption path and the cooling path, is at a common low pressure.

[0060] Taking the compressor 101 as the starting / stopping point of the parallel circulation path, and converging the parallel-connected heat absorption path and the cooling path at the compressor 101, the characteristics that the external heat exchanger and the first internal heat exchanger are at the same low pressure are formed. The external heat exchanger and the first internal heat exchanger simultaneously perform evaporation and 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, thereby cooling and condensing the water vapor in the air in the passenger compartment to generate droplets, achieving the purpose of cooling and dehumidifying. Furthermore, in order to avoid the adverse effect of finally icing / frosting the first internal heat exchanger due to the need to continuously lower the temperature of the first internal heat exchanger to maintain the dehumidification effect, the air sent to the first internal heat exchanger by the blower for condensation and dehumidification is reheated using the second internal heat exchanger to regain warmth.

[0061] In S203, when it is determined that the first dehumidification mode is entered, For air transportation According to the air temperature at a plurality of first predetermined positions in the heat exchange box and the degree of supercooling of the heat exchange medium at at least one second predetermined position in the transport pipeline, a control command for the first dehumidification mode is determined.

[0062] In this step, the first predetermined position includes the air outlet and the blowing side of the mounting position of the first internal heat exchanger. The corresponding air temperature includes 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 blowing side of the position where the first internal heat exchanger is arranged. The second predetermined position includes the output end of the second internal heat exchanger in the transport pipeline of the heat exchange medium. Accordingly, the degree of supercooling includes the target degree of supercooling at the output end.

[0063] In this embodiment, according to the first target temperature and the first closed-loop control model, a first closed-loop control command for the compressor is determined. According to the target degree of supercooling and the second closed-loop control model, a second closed-loop control command for the first electronic expansion valve attached to the output end of the second internal heat exchanger is determined. The second target temperatureAnd in accordance with the third closed-loop control model, determine the third closed-loop control command for the second electronic expansion valve attached to the input end of the first internal heat exchanger.

[0064] It should be noted that the types of the first closed-loop control model, the second closed-loop control model, and the third closed-loop control model include PI (Proportion Integral) proportional-integral model, PID (Proportion Integral Differential) proportional-integral-differential model, etc. Those skilled in the art can select appropriate models and control parameters of each closed-loop control model according to the actual application scenarios.

[0065] In S204, output a control command so that the first target temperature and the second target temperature simultaneously meet the predetermined requirements of the dehumidification function.

[0066] In this step, the first target temperature is For air transportation including the air temperature at the air outlet of the heat exchange box, and the second target temperature is The air temperature on the blowing side at the position where the first internal heat exchanger is arranged as follows.

[0067] Specifically, send the closed-loop control commands corresponding to the compressor, the first electronic expansion valve, and the second electronic expansion valve respectively.

[0068] As shown in FIG. 1, turn on the electronic expansion valve 109 and the electronic expansion valve 110, open the parallel circulation path, and send the first closed-loop control command to the compressor 101, the second closed-loop control command to the electronic expansion valve 106 which is the first electronic expansion valve, and the third closed-loop control command to the electronic expansion valve 107 which is the second electronic expansion valve.

[0069] By controlling the air temperature at the air outlet of the air conditioning box 120 with the compressor 101, the air temperature at the air outlet reaches the target blowing temperature. By controlling the degree of subcooling of the internal condenser 103, which is the second internal heat exchanger, with the electronic expansion valve 106, which is the first electronic expansion valve, the refrigerant can operate in a relatively efficient state and no noise is generated during the flow of the refrigerant. By controlling the air temperature on the blowing side of the evaporator 102 with the electronic expansion valve 107, which is the second electronic expansion valve, the temperature reaches the target air temperature. Through the above three controls, the first target temperature and the second target temperature simultaneously meet the predetermined requirements.

[0070] The predetermined requirements include the requirement that the first target temperature cannot be lower than the first predetermined target value, and the requirement that the second target temperature cannot be lower than the second predetermined target value. If the first target temperature is too low, the temperature of the air inside the vehicle will drop rapidly, affecting the subsequent condensation and dehumidification effects. The reason is that when the air temperature decreases, it is necessary to continuously lower the temperature of the evaporator 102 to achieve the condensation and dehumidification effects. However, if the temperature of the evaporator 102 is continuously lowered, problems of frosting or icing will occur, causing damage to the evaporator 102. Therefore, in order to be able to perform dehumidification continuously, the first target value and the second target value must be controlled simultaneously. The two are in an inseparable coupling relationship.

[0071] Optionally, a plurality of control threads may be set to perform closed-loop control individually for each of the compressor, the first electronic expansion valve, and the second electronic expansion valve.

[0072] Based on the above technical content, when the humidity in the passenger compartment exceeds the optimal humidity range, or the dehumidification function is manually activated, or the control of the heat pump system has the same effect as dehumidification, first, the environmental temperatures inside and outside the vehicle are obtained by each in-vehicle sensor, and then the current dehumidification load of the heat pump system is calculated. The external environmental temperature, that is, the outside temperature, reflects whether it is currently suitable for actively absorbing heat from the outside. When the dehumidification load exceeds the load threshold and the external heat is sufficient, the heat of the external environment is actively absorbed by the external heat exchanger of the heat pump system and transferred to the air flowing through the first internal heat exchanger via the heat exchange medium, so that the side effect of the temperature drop in the passenger compartment caused by cooling dehumidification is balanced or improved, and the purpose of maintaining the optimal dehumidification effect is achieved. At the same time, by using the natural heat of the external environment instead of the output power of some compressors, the energy consumption of the vehicle is saved. In this process, the control of the first target temperature at the air outlet and the second target temperature, which is the temperature 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 achieve both stability and safety, and it often causes vibrations and noises of the heat pump system. In contrast, the present application For air transportation Perform multi-stage temperature monitoring and closed-loop adjustment in the heat exchange box, cooperate with the closed-loop control of the degree of subcooling of the heat exchange medium at important positions, and ensure that the air temperature at the air outlet and the temperature of the evaporator are within their respective safe ranges, thereby avoiding the stability and safety problems that occur when the heat pump system absorbs the heat of the external environment to supplement the temperature of the air flowing through the first internal heat exchanger.

[0073] An embodiment of the present application provides a control method for a dehumidification mode. When it is detected that there is a dehumidification requirement in the passenger compartment, the dehumidification load and the external environmental temperature of a heat pump system including an external heat exchanger and a first internal heat exchanger are obtained. Then, according to the dehumidification load, the external environmental temperature, and a load threshold value, it is determined whether to enter the first dehumidification mode. The first dehumidification mode is used to supplement heat to the air flowing through the first internal heat exchanger to increase the temperature by absorbing the heat of the external environment by the external heat exchanger during dehumidification. When it is determined to enter the first dehumidification mode, For air transportation According to the air temperature at a plurality of first predetermined positions in the heat exchange box and the degree of subcooling of the heat exchange medium at at least one second predetermined position in the transport pipeline, a control command for the first dehumidification mode is determined. Next, a control command is output so that the first target temperature and the second target temperature simultaneously meet the predetermined requirements of the dehumidification function. The technical problem of how to dehumidify a new energy vehicle is solved. By actively absorbing the heat of the external environment to supplement the heat of the dehumidified air, the technical effect of achieving energy savings as well as improving the stability and safety of the system is achieved.

[0074] FIG. 3 is a flowchart of another control method for a dehumidification mode provided by an embodiment of the present application. As shown in FIG. 3, the specific steps of the control method for the dehumidification mode include S301 to S318.

[0075] In S301, when it is detected that there is a dehumidification requirement in the passenger compartment, the external environmental temperature, the temperature of the passenger compartment, the percentage of internal circulation, the percentage of external circulation, and the air volume of the blower are obtained.

[0076] For a detailed description of this step, reference can be made to step S201, which will not be repeatedly described here.

[0077] In S302, using a preset load model, a dehumidification load is determined according to a predetermined reference value of the first target temperature, the external environmental temperature, the percentage of external circulation, the temperature of the passenger compartment, the percentage of internal circulation, and the air volume of the blower.

[0078] In this step, first, the actual blowing temperature when blowing the air in the passenger compartment to the first internal heat exchanger by the blower is calculated by the formula: actual blowing temperature = external environmental temperature * percentage of external circulation + temperature of the passenger compartment * percentage of internal circulation.

[0079] When the air conditioner in the vehicle is started, since the air circulation mode includes internal circulation and external circulation, internal circulation means that the air is sucked into the blower from inside the vehicle, that is, from the passenger compartment, For air transportation blown to the air conditioning box 120 which is a heat exchange box, and then the air is For air transportation after being cooled and / or heated by each heat exchanger in the heat exchange box, returned to the inside of the vehicle, that is, to the passenger compartment from the air outlet, and thus, the internal circulation is formed.

[0080] External circulation means that the air is sucked into the blower from outside the vehicle, that is, from the external environment, For air transportation blown to the heat exchange box, and then the air is For air transportation after being cooled and / or heated by each heat exchanger in the heat exchange box, blown to the inside of the vehicle, that is, to the passenger compartment from the air outlet.

[0081] Since there are users such as drivers and passengers in the vehicle, the oxygen in the vehicle is consumed by the respiratory action and the concentration of carbon dioxide increases. If the internal circulation is carried out for a long time, the users will be in a low-oxygen state. Therefore, in order to avoid the low-oxygen phenomenon, it is necessary to allocate the circulation ratio of internal circulation and external circulation.

[0082] Thus, when determining the dehumidification load, in order to ensure accuracy, it is necessary to first calculate the actual blowing temperature.

[0083] And because the blowing temperatures of the air outlets designed according to different dehumidification modes are different, and thus the magnitudes of the dehumidification loads are also different, in order to meet the initial setting requirements of the first dehumidification mode, it is necessary to calculate the dehumidification load using the preset target blowing temperature of the air outlet.

[0084] In this embodiment, the calculation model of the dehumidification load is The dehumidification load = (target blowing temperature - actual blowing temperature) * air volume of the blower * specific heat of air.

[0085] In S303, it is determined whether to enter the first dehumidification mode according to the dehumidification load, the external environmental temperature, and the load threshold.

[0086] In this step, when the dehumidification load is equal to or greater than the load threshold and the external environmental temperature is equal to or lower than the first temperature threshold, it is determined to enter the first dehumidification mode, that is, step S304 is executed. When the dehumidification load is less than the load threshold and the external environmental temperature is equal to or higher than the second temperature threshold, it is determined to enter the second dehumidification mode, that is, step S315 is executed.

[0087] The first dehumidification mode is used to supplement heat to the air flowing through the first internal heat exchanger to raise the temperature by absorbing the heat of the external environment by the external heat exchanger during dehumidification.

[0088] The second dehumidification mode is used to supplement heat to the air flowing through the first internal heat exchanger to raise the temperature by using the heat of the battery cooling circuit and / or the heat of the heating device during dehumidification. The second temperature threshold is greater than the first temperature threshold. When the first dehumidification mode can no longer meet the dehumidification requirements, or the temperature of the external environment is too low and the heat absorbed is not enough to compensate for the temperature drop caused by cooling dehumidification, the heat of other heating devices inside the vehicle needs to be scheduled to supplement the air flowing through the first internal heat exchanger.

[0089] Note that the second temperature threshold is greater than the first temperature threshold. That is, when switching the dehumidification mode, it is necessary to perform hysteresis processing on the external environmental temperature. At this time, the second temperature threshold = the first temperature threshold + a predetermined temperature difference. Optionally, the predetermined temperature difference is 5°C.

[0090] Optionally, the load threshold includes the power consumption at the minimum rotation speed of the compressor or a corrected value obtained by correcting the power consumption at the minimum rotation speed of the compressor with a preset correction algorithm.

[0091] In S304, according to the external environmental temperature and a preset first correspondence relationship, a first lower limit value for the operation of the second electronic expansion valve is determined.

[0092] In this step, the second electronic expansion valve is attached to the input end of the first internal heat exchanger.

[0093] In this embodiment, as shown in FIG. 1, the first internal heat exchanger is the evaporator 102, and the second electronic expansion valve is the electronic expansion valve 107 in front of the evaporator 102, that is, the electronic expansion valve.

[0094] In S305, using a preset algorithm, according to the external environmental temperature, the temperature of the passenger compartment, the percentage of internal circulation, the percentage of external circulation, and the air volume of the blower, a first upper limit value for the operation of the second electronic expansion valve is determined.

[0095] In this step, first, the values of the influencing factors are The influencing factor is calculated as (external environmental temperature * percentage of external circulation + temperature of the passenger compartment * percentage of internal circulation) * air volume of the blower, According to the calculation result of the above influencing factor and the mapping relationship corresponding to the influencing factor, a first upper limit value for the operation of the corresponding second electronic expansion valve is determined.

[0096] In S306, according to the external environmental temperature and a preset second correspondence relationship, a second upper limit value and a second lower limit value for the operation of the first electronic expansion valve are determined.

[0097] In this step, the first electronic expansion valve is attached to the output end of the second internal heat exchanger.

[0098] In this embodiment, as shown in FIG. 1, the first electronic expansion valve is the electronic expansion valve 106, the second internal exchanger is the internal condenser 103, and a one-way check valve 108 for preventing reverse flow of the refrigerant is attached to the output end of the internal condenser 103.

[0099] In steps S304 to S306, the reason for restricting the upper and lower limits of the opening degrees of the first electronic expansion valve and / or the second electronic expansion valve is due to the restriction of the external environment. The heat that the heat pump system can actively absorb is related to the temperature of the external environment. Therefore, when the heat pump system operates, if the objective restrictions are ignored and the opening degree of the electronic expansion valve continuously increases or decreases, the system may chatter and significant noise may occur. Or, in the case where the opening degree fluctuation range is too large, when the difference between the current opening degree of the electronic expansion valve at a certain time and the target opening degree according to the control command is too large, the adjustment time is too long, which may affect the stability of the system. Or, after the electronic expansion valve exceeds its upper and lower limits, its adjustment function becomes invalid, and thus, the controller may send an invalid target opening degree. Therefore, by restricting its upper and lower limits, the stability of the entire heat pump system is maintained.

[0100] In S307, according to the first target temperature and the first closed-loop control model, the first closed-loop control command for the compressor is determined.

[0101] In this step, the first target temperature For air transportation includes the air temperature at the outlet of the heat exchange box.

[0102] In S308, according to the target subcooling degree and the second closed-loop control model, the second closed-loop control command for the first electronic expansion valve is determined.

[0103] In this step, the target subcooling degree includes the subcooling degree at the output end of the second internal heat exchanger of the heat exchange medium, i.e., the refrigerant.

[0104] In S309, The second target temperatureAnd in accordance with the third closed-loop control model, determine a third closed-loop control command for the second electronic expansion valve.

[0105] In this step, The second target temperature is the For air transportation air temperature on the blowing side at the mounting position in the heat exchange box of the first internal heat exchanger.

[0106] In S310, so that the first target temperature and the second target temperature simultaneously meet the predetermined requirements of the dehumidification function, output a first closed-loop control command, a second closed-loop control command, and a third closed-loop control command to each of the compressor, the first electronic expansion valve, and the second electronic expansion valve.

[0107] In this step, the second target temperature is The air temperature on the blowing side at the position where the first internal heat exchanger is arranged is.

[0108] In steps S307 to S310, in the closed-loop control of the temperature at the air outlet using the compressor, compared with the conventional technology of controlling the second target temperature, which is the temperature on the blowing side at the mounting position where the first internal heat exchanger is arranged, using the compressor, in the present application, the control is changed to controlling the first target temperature, which is the temperature at the air outlet, using the compressor, so that the target of stable control can be more easily achieved. As a result, the technical problem of stably controlling the first target temperature and the second target temperature simultaneously is overcome, and the problem existing in the conventional technology that the heat pump system chatters due to the inability to control both simultaneously is avoided.

[0109] In S311, obtain the pressure value at the input end of the compressor.

[0110] In this step, when the first dehumidification mode is executed, the heat exchange media in the heat replenishment path and the cooling path connected in parallel have a common low pressure value after evaporation, and if a pressure sensor is installed at the input end of the compressor, the pressure value can be monitored in real time.

[0111] In S312, when the pressure value is less than the first pressure threshold value, the output of the second closed-loop control command of the first electronic expansion valve is temporarily stopped, and the opening degree of the first electronic expansion valve is increased at a predetermined speed, and the output of the second closed-loop control command is resumed until the pressure value becomes equal to or greater than the second pressure threshold value.

[0112] In this step, when 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 temporarily stopped, and the opening degree of the first electronic expansion valve is switched to a mode of increasing at a predetermined speed (for example, 0.1% / S). At the same time, it is detected in real time whether the pressure value has recovered to the second pressure threshold value. When the pressure value has recovered to the second pressure threshold value, the execution of the closed-loop control for the first electronic expansion valve is continued.

[0113] Preventing the pressure imbalance of the heat pump system by controlling the pressure at the low-pressure end is because when the means of parallel dehumidification is adopted, chattering of the system is likely to occur. Therefore, in order to enhance safety, reduce chattering, or prevent the occurrence of chattering exceeding the adjustment ability of the system, monitoring the pressure value at the low-pressure end is a useful means for preventing chattering discovered by the inventor of the present application. Since there is a certain delay in the calculation and execution of the control command, when the pressure value at the low-pressure end is less than the first pressure threshold value, due to the influence of this delay, the operating state of the entire system exceeds the adjustment ability of the system in the first dehumidification mode, or the closed-loop adjustment is too fast, indicating that the state of the system has not caught up in a timely manner. In this case, if the closed-loop control is temporarily stopped and waiting until the pressure at the low-pressure end recovers and then the adjustment is resumed, the stability of the system can be further ensured.

[0114] In S313, in response to the frost prevention start command by the first internal heat exchanger, the second electronic expansion valve attached to the input end of the first internal heat exchanger is closed, and at the same time, the first opening degree value before the second electronic expansion valve is closed is recorded, and the rotational speed of the compressor is maintained as it is.

[0115] In S314, in response to the defrost prevention stop command by 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 for the second electronic expansion valve is restarted.

[0116] Regarding steps S313 and S314, the control method of the first dehumidification mode is theoretically safe. However, in reality, due to various unpredictable factors such as the contradiction between the effective time of each control command and the delay characteristics during execution, the phenomenon that the first internal heat exchanger frosts in extreme cases still exists. After the sensor detects frosting, it immediately starts defrost prevention, stops the heat exchange by the first internal heat exchanger, waits until the frost melts, and then continues dehumidification. In this way, the dangerous situation of damage to the first internal heat exchanger caused by frosting / icing of the first internal heat exchanger is avoided, and the stability and safety of the heat pump system are improved.

[0117] Note that since there is no requirement for the order before and after S312~S314 and S307~S310, it can be understood that they are controlled by parallel threads.

[0118] The next step is a step under the second dehumidification mode.

[0119] In S315, the water temperature of the battery cooling circuit in the coolant liquid circulation system is acquired.

[0120] In this step, as an in-vehicle heat management system, in addition to the heat pump system, the coolant liquid circulation system is also included, which is used to thermally manage power equipment such as power batteries, motors, and engines. Since power equipment generates a large amount of heat during operation, generally, the coolant liquid circulation system is used to cool the power equipment and discharge the heat to the external environment. The water temperature of the battery cooling circuit can be acquired by a temperature sensor at a predetermined position on the coolant liquid pipeline.

[0121] In S316, according to the water temperature and the target blowing temperature at the air outlet, it is determined whether the waste heat of the battery meets the heat replenishment requirement.

[0122] In this step, based on the temperature difference obtained by comparing the water temperature with the target blowing temperature at the air outlet, the direction of heat transfer can be known, and according to the specific heat capacity of the coolant liquid, it can be recognized whether the heat in the battery cooling circuit can meet the requirements of dehumidification and heat replenishment. If the heat in the battery cooling circuit meets the requirements of dehumidification and heat replenishment, step S317 is executed; if the heat in the battery cooling circuit does not meet the requirements of dehumidification and heat replenishment, step S318 is executed.

[0123] In S317, the electronic expansion valve that controls the introduction of the coolant liquid in the battery cooling circuit into the heating heater core in the passenger compartment is controlled.

[0124] In this embodiment, the heater core is used to replenish heat to the passenger compartment using the coolant liquid to raise the temperature. The heater core can be installed in the heat exchange box so that the air is heated in front of the air outlet. For air transportation It can be installed in the heat exchange box.

[0125] In S318, the heating device is started to heat the coolant liquid flowing through the heater core.

[0126] In this step, the heating device includes a PTC heater, which heats the coolant liquid, and when the coolant liquid flows through the heater core, For air transportation the air in the heat exchange box is heated.

[0127] Regarding steps S315 - S318, when sufficient heat cannot be provided by the external environment, it is selected to absorb heat from the heating devices in the vehicle for dehumidification and heat replenishment, prioritize heat replenishment by utilizing the waste heat of the coolant liquid of the battery cooling, drive motor or engine, and realize the recovery management of thermal energy. However, when the waste heat is not sufficient, the energy of the vehicle itself is used for heating, and under the condition that the dehumidification effect can be ensured, the effect of reducing energy consumption as much as possible is achieved. In this way, more energy is available when the vehicle is running, and the driving range of the new energy vehicle is improved.

[0128] The embodiment of the present application provides a control method for a dehumidification mode. When it is detected that there is a dehumidification requirement in the passenger compartment, the dehumidification load and the external environmental temperature of a heat pump system including an external heat exchanger and a first internal heat exchanger are obtained, and then, according to the dehumidification load, the external environmental temperature, and a load threshold value, it is determined whether to enter the first dehumidification mode. The first dehumidification mode is used to supplement heat to the air flowing through the first internal heat exchanger to increase the temperature by absorbing the heat of the external environment by the external heat exchanger during dehumidification. When it is determined to enter the first dehumidification mode, For air transportation According to the air temperature at a plurality of first predetermined positions in the heat exchange box and the degree of subcooling of the heat exchange medium at at least one second predetermined position in the transport pipeline, a control command for the first dehumidification mode is determined, and then a control command is output so that the first target temperature and the second target temperature simultaneously meet the predetermined requirements of the dehumidification function. The technical problem of how to dehumidify a new energy vehicle is solved, and by actively absorbing the heat of the external environment to supplement heat to the dehumidified air, the technical effects of achieving energy conservation as well as improving the stability and safety of the system are achieved.

[0129] FIG. 4 is a schematic structural diagram of a control device for a dehumidification mode provided by an embodiment of the present application. The The control device in the dehumidification mode 400 can be implemented by software, hardware, or a combination of software and hardware.

[0130] As shown in FIG. 4, the The control device in the dehumidification mode 400 is an acquisition module 401 for obtaining the dehumidification load and the external environmental temperature of a heat pump system including an external heat exchanger and a first internal heat exchanger when it is detected that there is a dehumidification requirement in the passenger compartment, and determining whether to enter the first dehumidification mode used to supplement heat to the air flowing through the first internal heat exchanger to increase the temperature by absorbing the heat of the external environment by the external heat exchanger during dehumidification according to the dehumidification load, the external environmental temperature, and a load threshold value, and When it is determined that the first dehumidification mode is entered, according to the air temperature at a plurality of first predetermined positions in the air transport heat exchange box, including the outlet and the outlet side of the position where the first internal heat exchanger is arranged, and the degree of subcooling of the heat exchange medium at at least one second predetermined position in the transport pipeline, determining a control command for the first dehumidification mode, Outputting a control command so that the first target temperature including the air temperature at the outlet and the second target temperature which is the air temperature at the outlet side of the position where the first internal heat exchanger is arranged simultaneously satisfy the predetermined requirements of the dehumidification function; and a processing module 402 used for this.

[0131] In one possible design, the control command includes a closed-loop control command for performing closed-loop control on each of the controlled objects in the heat pump system. The role of the controlled object includes the role of circulating and flowing the heat exchange medium along the parallel circulation path in the transport pipeline. The parallel circulation path includes a heat absorption path, a cooling path, and a heat replenishment path. The heat absorption path is connected in parallel with the cooling path and then connected in series with the heat replenishment path. The external heat exchanger is located on the heat absorption path, the first internal heat exchanger is located on the cooling path, the heat pump system further includes a second internal heat exchanger, the second internal heat exchanger is located on the heat replenishment 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.

[0132] In one possible design 、No. The two predetermined positions include the output end of the second internal heat exchanger. Accordingly, the degree of subcooling includes the target degree of subcooling at the output end. Accordingly, the processing module 402 determines a first closed-loop control command for the compressor according to the first target temperature and the first closed-loop control model. Determining a second closed-loop control command for the first electronic expansion valve attached to the output end of the second internal heat exchanger according to the target degree of subcooling and the second closed-loop control model. The second target temperatureand according to the third closed-loop control model, determining a third closed-loop control command for the second electronic expansion valve attached to the input end of the first internal heat exchanger, and is used for

[0133] In one possible design, the acquisition module 401 is used to acquire the temperature of the passenger compartment, the percentage of internal circulation, the percentage of external circulation, and the air volume of the blower. The processing module 402 is used to determine the dehumidification load according to a preset load model, the predetermined reference value of the first target temperature, the external environmental temperature, the percentage of external circulation, the temperature of the passenger compartment, the percentage of internal circulation, and the air volume of the blower.

[0134] In one possible design, the processing module 402 is further used to determine a first lower limit value for the operation of the second electronic expansion valve attached to the input end of the first internal heat exchanger according to the external environmental temperature and a preset first correspondence relationship. The acquisition module 401 is further used to acquire the temperature of the passenger compartment, the percentage of internal circulation, the percentage of external circulation, and the air volume of the blower. The processing module 402 is further used to determine a first upper limit value for the operation of the second electronic expansion valve according to a preset algorithm, the external environmental temperature, the temperature of the passenger compartment, the percentage of internal circulation, the percentage of external circulation, and the air volume of the blower. The first upper limit value and the first lower limit value are used to temporarily stop or switch the dehumidification mode of the heat pump system when the external environmental temperature exceeds the first temperature range.

[0135] In one possible design, the processing module 402 is further used to determine a second upper limit value and a second lower limit value for the operation of the first electronic expansion valve attached to the output end of the second internal heat exchanger according to the external environmental temperature and a preset second correspondence relationship. The second upper limit value and the second lower limit value are used to temporarily stop or switch the dehumidification mode of the heat pump system when the external environmental temperature exceeds the second temperature range.

[0136] In one possible design, the processing module 402 is further used to when it is detected that the opening degree of the first electronic expansion valve is at the second lower limit value and the degree of subcooling at the output end of the second internal heat exchanger is below a preset subcooling degree threshold within a predetermined time, and is further used to switch the dehumidification mode to the second dehumidification mode. In the second dehumidification mode, during dehumidification, the heat of the battery cooling circuit or the heat of the heating device is used to The air flowing through the first internal heat exchanger supplement heat to and increase the temperature of . .

[0137] In one possible design, the acquisition module 401 is further used to acquire the pressure value at the input end of the compressor. When the pressure value is less than the first pressure threshold, the processing module 402 temporarily stops outputting the second closed-loop control command for the first electronic expansion valve attached to the output end of the second internal heat exchanger, and switches to a mode of increasing the opening degree of the first electronic expansion valve at a predetermined speed, and is further used to resume outputting the second closed-loop control command until the pressure value is equal to or greater than the second pressure threshold.

[0138] In one possible design, in response to the frosting prevention start command from the first internal heat exchanger, the processing module 402 closes the second electronic expansion valve attached to the input end of the first internal heat exchanger, and at the same time records the first opening degree value before the second electronic expansion valve closes, and is further used to maintain the rotational speed of the compressor unchanged.

[0139] In one possible design, in response to the frosting prevention stop command from the first internal heat exchanger, the processing module 402 sets the initial opening degree value of the second electronic expansion valve to the first opening degree value, and is further used to resume the closed-loop control for the second electronic expansion valve.

[0140] In one possible design, the processing module 402 is used to determine to enter the first dehumidification mode when the dehumidification load is equal to or greater than the load threshold and the external environmental temperature is equal to or lower than the first temperature threshold.

[0141] In one possible design, the processing module 402 is used to determine to enter a second dehumidification mode when the dehumidification load is less than the load threshold or the external environmental temperature is equal to or higher than the second temperature threshold. In the second dehumidification mode, during dehumidification, heat is replenished to the air flowing through the first internal heat exchanger using the heat of the battery cooling circuit or the heat of the heating device to increase the temperature. The second temperature threshold is greater than the first temperature threshold.

[0142] In one possible design, the acquisition module 401 is further used to acquire the water temperature of the battery cooling circuit in the coolant liquid circulation system. The processing module 402 determines whether the waste heat of the battery meets the heat replenishment requirement according to the water temperature and the target blowing temperature at the air outlet, and when it is determined that the heat replenishment requirement is met, controls the electronic expansion valve corresponding to introducing the coolant liquid of the battery cooling circuit into the heater core that heats the air flowing through the first internal heat exchanger, and when it is determined that the heat replenishment requirement is not met, further used to start the heating device to heat the coolant liquid flowing through the heater core. The heater core uses the coolant liquid The air flowing through the first internal heat exchanger to replenish heat and increase the temperature.

[0143] It should be noted that the device provided by the embodiment shown in FIG. 4 can execute the method provided by the embodiment of any of the above methods. Since its specific implementation principle, technical features, interpretation of technical terms, and technical effects are similar, they will not be repeated here.

[0144] FIG. 5 is a schematic structural diagram of an electronic device provided by an embodiment of the present application. As shown in FIG. 5, the electronic device 500 can include at least one processor 501 and a memory 502. FIG. 5 shows an example of an electronic device with one processor.

[0145] The memory 502 is used to store programs. Specifically, the program can include program codes including computer operation instructions.

[0146] The memory 502 can include a high-speed RAM memory and can further include a non-volatile memory, for example, at least one magnetic disk memory.

[0147] The processor 501 is used to implement the methods described in the embodiments of the above methods by executing the computer execution instructions stored in the memory 502.

[0148] Here, the processor 501 can be one central processing unit (abbreviated as CPU) or an application specific integrated circuit (abbreviated as ASIC), or can be configured as one or more integrated circuits for implementing the embodiments of the present application.

[0149] Optionally, the memory 502 may be arranged independently or may be integrated with the processor 501. When the memory 502 is a device independent of the processor 501, the electronic device 500 can further include a bus 503 for connecting the processor 501 and the memory 502. The bus can be an industry standard architecture (ISA) bus, a peripheral component interconnect interconnect (PCI) bus, or an extended industry standard architecture (EISA) bus, etc. The bus can be classified into an address bus, a data bus, a control bus, etc., but does not mean only one bus or one type of bus.

[0150] Optionally, when actually implemented, if the memory 502 and the processor 501 are integrated on one chip, the memory 502 and the processor 501 can complete communication through an internal interface.

[0151] The embodiments of the present application further provide a computer-readable storage medium, which can include various media capable of storing program codes, such as a USB disk memory, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk. Specifically, the computer-readable storage medium stores program instructions used in the methods in the embodiments of the above respective methods.

[0152] The embodiments of the present application further provide a computer program product including a computer program. When the computer program is executed by a processor, the methods in the embodiments of the above respective methods are implemented.

[0153] The embodiments of the present application further provide a computer program. When the computer program is executed by a processor, the methods in the embodiments of the above respective methods are implemented.

[0154] The above description is only the specific embodiments of the present application, but the scope of the present application is not limited thereto. Modifications or substitutions that can be easily conceived by those skilled in the art within the technical scope described in the present application are included within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the scope of the claims.

Claims

1. When it is detected that there is a dehumidification requirement in the passenger compartment, steps of obtaining the dehumidification load and the external environmental temperature of a heat pump system including an external heat exchanger and a first internal heat exchanger; According to the dehumidification load, the external environmental temperature, and a load threshold value, during dehumidification, determining whether to enter a first dehumidification mode used to supplement heat to the air flowing through the first internal heat exchanger to raise the temperature by absorbing heat from the external environment by the external heat exchanger; When it is determined to enter the first dehumidification mode, determining a control command for the first dehumidification mode according to the air temperature at a plurality of first predetermined positions including the air outlet and the blowing side of the position where the first internal heat exchanger is arranged in the heat exchange box for air transportation and the degree of subcooling of the heat exchange medium at at least one second predetermined position in the transportation pipeline; Outputting the control command so that a first target temperature including the air temperature at the air outlet and a second target temperature which is the air temperature at the blowing side simultaneously satisfy predetermined requirements of the dehumidification function. A control method for a dehumidification mode, characterized by including the above.

2. In the first dehumidification mode, the control command includes a closed-loop control command for performing closed-loop control on each controlled object in the heat pump system. The role of the controlled object includes the role of circulating and flowing the heat exchange medium along a parallel circulation path in the transportation pipeline. The parallel circulation path includes a heat absorption path, a cooling path, and a heat supplement path. The heat absorption path is connected in parallel with the cooling 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 cooling path, 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. The control method according to Claim 1, characterized by the above.

3. The second predetermined position includes the output end of the second internal heat exchanger. Accordingly, the degree of subcooling includes the target degree of subcooling at the output end. The step of determining the control command for the first dehumidification mode according to the air temperature at a plurality of first predetermined positions in the heat exchange box for air transportation and the degree of subcooling of the heat exchange medium at at least one second predetermined position in the transportation pipeline is as follows: Determining a first closed-loop control command for the compressor according to the first target temperature and the first closed-loop control model; Determining a second closed-loop control command for a first electronic expansion valve attached to the output end of the second internal heat exchanger according to the target degree of subcooling and the second closed-loop control model; Determining a third closed-loop control command for a second electronic expansion valve attached to the input end of the first internal heat exchanger according to the second target temperature and the third closed-loop control model. The control method according to claim 2 is characterized by including the above steps.

4. The step of obtaining the dehumidification load of the heat pump system includes: Obtaining the temperature of the passenger compartment, the percentage of internal circulation, the percentage of external circulation, and the air volume of the blower; Determining the dehumidification load according to the predetermined reference value of the first target temperature, the external environmental temperature, the percentage of external circulation, the temperature of the passenger compartment, the percentage of internal circulation, and the air volume of the blower by using a preset load model. The control method according to any one of claims 1 to 3 is characterized by including the above steps.

5. Before the step of determining the control command for the first dehumidification mode according to the air temperature at a plurality of first predetermined positions in the heat exchange box for air transportation and the degree of subcooling of the heat exchange medium at at least one second predetermined position in the transportation pipeline, the method further includes: Determining a first lower limit value for the operation of a second electronic expansion valve attached to the input end of the first internal heat exchanger according to the external environmental temperature and a preset first correspondence relationship; Obtaining the temperature of the passenger compartment, the percentage of internal circulation, the percentage of external circulation, and the air volume of the blower; Determining a first upper limit value for the operation of the second electronic expansion valve according to the external environmental temperature, the temperature of the passenger compartment, the percentage of internal circulation, the percentage of external circulation, and the air volume of the blower by using a preset algorithm. The control method according to any one of claims 1 to 4 is characterized by further including the above steps.

6. Before the step of determining the control command for the first dehumidification mode according to the air temperature at a plurality of first predetermined positions in the heat exchange box for air transportation and the degree of subcooling of the heat exchange medium at at least one second predetermined position in the transportation pipeline, further comprising the step of determining a second upper limit value and a second lower limit value for the operation of a first electronic expansion valve attached to the output end of the second internal heat exchanger according to the external environmental temperature and a preset second correspondence relationship, The control method according to claim 2 or 3, characterized in that.

7. After the step of outputting the control command, When it is detected that the opening degree of the first electronic expansion valve is at the second lower limit value and the degree of subcooling at the output end of the second internal heat exchanger is below a preset subcooling threshold value within a predetermined time, further comprising the step of switching the dehumidification mode to a second dehumidification mode, In the second dehumidification mode, during dehumidification, heat is supplemented to the air flowing through the first internal heat exchanger using the heat of the battery cooling circuit or the heat of the heating device to increase the temperature, The control method according to claim 6, characterized in that.

8. After the step of outputting the control command, the step of obtaining the pressure value at the input end of the compressor; When the pressure value is smaller than a first pressure threshold value, temporarily stop outputting the second closed-loop control command of the first electronic expansion valve attached to the output end of the second internal heat exchanger, and switch to a mode of increasing the opening degree of the first electronic expansion valve at a predetermined speed, and resume outputting the second closed-loop control command until the pressure value becomes equal to or greater than a second pressure threshold value, The control method according to any one of claims 2 to 3 and 6 to 7, characterized in that.

9. After the step of outputting the control command, in response to the frosting prevention start command by the first internal heat exchanger, closing the second electronic expansion valve attached to the input end of the first internal heat exchanger, and at the same time recording the first opening degree value before the second electronic expansion valve closes, and further comprising the step of maintaining the rotation speed of the compressor as it is, The control method according to any one of claims 1 to 8, characterized in that.

10. After the step of closing the second electronic expansion valve and maintaining the rotation speed of the compressor as it is, In response to the defrost prevention stop command by the first internal heat exchanger, further including the step of setting an initial opening degree value of the second electronic expansion valve to the first opening degree value and restarting the closed-loop control for the second electronic expansion valve, the control method according to claim 9, characterized in that.

11. The step of determining whether to enter the first dehumidification mode according to the dehumidification load, the external environmental temperature, and the load threshold is When the dehumidification load is greater than or equal to the load threshold and the external environmental temperature is less than or equal to the first temperature threshold, including the step of determining to enter the first dehumidification mode, the control method according to any one of claims 1 to 10, characterized in that.

12. The step of determining whether to enter the first dehumidification mode according to the dehumidification load, the external environmental temperature, and the load threshold is When the dehumidification load is less than the load threshold or the external environmental temperature is greater than or equal to the second temperature threshold, further including the step of determining to enter the second dehumidification mode. In the second dehumidification mode, during dehumidification, heat is supplemented to the air flowing through the first internal heat exchanger using the heat of the battery cooling circuit or the heat of the heating device to raise the temperature, and the second temperature threshold is greater than the first temperature threshold, the control method according to claim 11, characterized in that.

13. After the step of determining to enter the second dehumidification mode, The step of obtaining the water temperature of the battery cooling circuit in the coolant liquid circulation system and The step of determining whether the waste heat of the battery satisfies the heat supplement requirement according to the water temperature and the target blowing temperature at the air outlet and When it is determined that the heat supplement requirement is satisfied, the step of controlling the electronic expansion valve corresponding to introducing the coolant liquid of the battery cooling circuit into the heater core and When it is determined that the heat supplement requirement is not satisfied, further including the step of starting the heating device to heat the coolant liquid flowing through the heater core, The heater core is used to supplement heat to the air flowing through the first internal heat exchanger using the coolant liquid to raise the temperature, the control method according to claim 12, characterized in that.

14. An acquisition module for acquiring the dehumidification load and the external environmental temperature of a heat pump system including an external heat exchanger and a first internal heat exchanger when it is detected that there is a dehumidification requirement in the passenger compartment, Determine whether to enter a first dehumidification mode that is used to supplement heat to the air flowing through the first internal heat exchanger and increase the temperature by absorbing heat from the external environment by the external heat exchanger during dehumidification according to the dehumidification load, the external environmental temperature, and the load threshold value. When it is determined to enter the first dehumidification mode, determine the control command for the first dehumidification mode according to the air temperature at a plurality of first predetermined positions in the air transportation heat exchange box, including the air outlet and the blowing side of the position where the first internal heat exchanger is arranged, and the degree of supercooling of the heat exchange medium at at least one second predetermined position in the transportation pipeline. Output the control command so that the first target temperature including the air temperature at the air outlet and the second target temperature which is the air temperature at the blowing side simultaneously satisfy the predetermined requirements of the dehumidification function. A processing module used for this is provided. A control device for a dehumidification mode, characterized in that.

15. An electronic device comprising a processor and a memory communicably connected to the processor, The memory stores computer-executable instructions. The processor executes the computer-executable instructions stored in the memory to implement the control method for the dehumidification mode according to any one of claims 1 to 13. An electronic device.

16. A computer-readable storage medium characterized in that computer-executable instructions are stored therein, and the computer-executable instructions are used to implement the method according to any one of claims 1 to 13 when executed by a processor.

17. A computer program including program code, wherein when the computer operates the computer program, the computer executes the method according to any one of claims 1 to 13 based on the program code. A computer program characterized in that.

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