Dehumidification control method and system of heat pump system and vehicle

Abstract

The invention provides a dehumidification control method and system of a heat pump system and a vehicle. The method comprises the steps that after a passenger compartment dehumidification request is received, a compressor refrigeration side rotating speed request is determined based on a passenger compartment refrigeration requirement; determining a compressor heating side rotating speed request based on the passenger compartment heating demand; taking the larger one of the compressor refrigeration side rotating speed request and the compressor heating side rotating speed request as a compressor target rotating speed request; and controlling the compressor based on the compressor target rotational speed request. According to the invention, a PTC heater can be omitted, and the system energy consumption in a dehumidification mode is reduced.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a dehumidification control method, system and vehicle for a heat pump system. Background Art

[0002] With the development of new energy and the improvement of environmental awareness, the market share of electric vehicles has gradually increased. In order to improve the energy utilization rate of electric vehicles and reduce the power consumption of the whole vehicle, more and more electric vehicles are equipped with heat pump systems as standard. At present, the mainstream dehumidification solution of the heat pump system is: under the dehumidification of the evaporator, the PTC heater (high-pressure liquid or air heater) is used to supplement the heat in the passenger compartment to increase the temperature in the passenger compartment. However, this method consumes additional electricity and increases the energy consumption of the heat pump system. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a dehumidification control method, system and vehicle for a heat pump system, which can eliminate the PTC heater and reduce the system energy consumption in the dehumidification mode.

[0004] One aspect of an embodiment of the present application provides a control method for a heat pump system. The method includes: after receiving a passenger compartment dehumidification request, determining a compressor cooling side speed request based on a passenger compartment cooling demand; determining a compressor heating side speed request based on a passenger compartment heating demand; taking the larger of the compressor cooling side speed request and the compressor heating side speed request as a compressor target speed request; and controlling the compressor based on the compressor target speed request.

[0005] Further, the determining of the compressor cooling side speed request based on the passenger compartment cooling demand includes: obtaining a first feedforward speed of the compressor feedforward control based on the evaporator target temperature and the air conditioning blower target air volume; obtaining the evaporator actual temperature; obtaining a first feedback speed of the compressor closed-loop feedback control based on the evaporator actual temperature and the evaporator target temperature; and obtaining the compressor cooling side speed request based on the first feedforward speed and the first feedback speed.

[0006] The method of determining the compressor heating side speed request based on the passenger compartment heating demand includes: obtaining a second feedforward speed of the compressor feedforward control based on a heater core target temperature and a heater core target air volume of a passenger compartment circuit; obtaining an actual cabin water temperature of the passenger compartment circuit; obtaining a second feedback speed of the compressor closed-loop feedback control based on the actual cabin water temperature and the cabin target water temperature; and obtaining the compressor heating side speed request based on the second feedforward speed and the second feedback speed.

[0007] Further, the heat pump system includes a first throttle valve, one end of which is connected to the exhaust port of the compressor via a condenser, and the other end of the first throttle valve is connected to the intake port of the compressor via a cooler. The method also includes: when the actual temperature of the evaporator is higher than the evaporator target temperature, or the actual water temperature of the passenger cabin is lower than the target water temperature of the passenger cabin, it is determined that there is excess cooling or insufficient heat, and the first throttle valve is controlled to be opened; when the actual temperature of the evaporator is lower than the evaporator target temperature, or the actual water temperature of the passenger cabin is higher than the target water temperature of the passenger cabin, it is determined that there is insufficient cooling or excess heat, and the first throttle valve is controlled to be closed.

[0008] Furthermore, the method also includes: obtaining a battery temperature of the vehicle; when the battery temperature is higher than a first preset battery temperature threshold, it is determined that the battery has waste heat to utilize, and the battery circuit is controlled to release heat to the refrigerant circuit, thereby supplementing heat for the passenger compartment; when the battery temperature is not higher than the first preset battery temperature threshold, it is determined that the battery has no waste heat to utilize, and the electric drive circuit and the environmental heat exchange circuit are controlled to be connected in series and release heat to the refrigerant circuit, thereby supplementing heat for the passenger compartment; when the battery temperature is lower than a second preset battery temperature threshold, it is determined that the battery can store heat, and the passenger compartment circuit is controlled to release heat to the battery circuit; and when the battery temperature is not lower than the second preset battery temperature threshold, it is determined that the battery cannot store heat, and the passenger compartment circuit is controlled to release heat to the electric drive circuit and the environmental heat exchange circuit connected in series.

[0009] Furthermore, the method further includes: controlling the opening of the first throttle valve, including:

[0010] According to the evaporator target temperature, the corresponding evaporator saturation pressure is obtained by consulting the refrigerant property table;

[0011] Obtaining a first opening of the first throttle valve closed-loop low-pressure control according to the evaporator saturation pressure being biased downward by a predetermined pressure value; obtaining a compressor suction superheat and a compressor exhaust superheat;

[0012] obtaining a second opening degree of the first throttle valve closed-loop superheat control based on the compressor suction superheat and the compressor exhaust superheat; and

[0013] The first throttle valve is controlled at a smaller opening between the first opening and the second opening.

[0014] Furthermore, the environmental heat exchange loop includes a radiator, the radiator includes a fan, and the method further includes: controlling the rotation speed of the fan, including:

[0015] determining a first speed of the fan according to a heat pump demand;

[0016] Determining a second speed of the fan according to a heat dissipation requirement of the electric drive in the electric drive circuit;

[0017] When the difference between the actual cabin water temperature and the absolute cabin water temperature is less than a predetermined value, or the difference between the target cabin water temperature and the actual cabin water temperature is higher than a predetermined value, the ambient heat exchange circuit is controlled to dissipate heat, and the third speed of the fan closed-loop control is obtained by taking the smaller of the difference between the absolute cabin water temperature and the predetermined temperature value and the sum of the target cabin water temperature and the predetermined temperature value as a target; when the above conditions are not met, the third speed is controlled to be 0; and

[0018] The fan is controlled at a larger speed among the first speed, the second speed, and the third speed.

[0019] Further, the heat pump system further comprises a third throttle valve, one end of the third throttle valve is connected to the cooler, and the other end of the third throttle valve is connected to the air intake port of the compressor through the evaporator. The method further comprises: controlling the opening of the third throttle valve, including:

[0020] obtaining a first opening degree of the third throttle valve closed-loop control based on the actual evaporator temperature and the target evaporator temperature;

[0021] Get the compressor speed and actual evaporator superheat;

[0022] obtaining a feedforward opening of the third throttle valve feedforward control based on the compressor speed;

[0023] Obtaining a feedback opening of the third throttle valve closed-loop feedback control based on the actual superheat of the evaporator and the target superheat of the evaporator;

[0024] obtaining a second opening of the third throttle valve based on the feedforward opening and the feedback opening; and

[0025] The third throttle valve is controlled at a smaller one of the first opening degree and the second opening degree.

[0026] Furthermore, the battery circuit includes a battery water pump, the electric drive circuit includes an electric drive water pump, and the method further includes: controlling the rotation speed of the battery water pump, including:

[0027] When the first throttle valve is opened to absorb heat from the battery circuit, determining a first rotation speed of the battery water pump based on actual demand;

[0028] Obtaining a second rotation speed of the battery water pump based on the battery's own requirements;

[0029] When dissipating heat to the battery circuit, determining a third speed of the battery water pump based on actual demand; and

[0030] Controlling the battery water pump at a larger speed between one of the first speed and the third speed and the second speed;

[0031] Controlling the rotation speed of the electric drive water pump comprises:

[0032] When the first throttle valve is opened to absorb heat from the electric drive circuit, a first rotation speed of the electric drive water pump is obtained according to a heat pump demand;

[0033] Obtaining a second rotation speed of the electric drive water pump based on the heat dissipation requirement of the electric drive itself; and

[0034] The electric water pump is controlled at the larger of the first rotational speed and the second rotational speed.

[0035] Another aspect of the embodiment of the present application provides a dehumidification control system for a heat pump system. The dehumidification control system includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the dehumidification control method for the heat pump system described above when executing the computer program.

[0036] Another aspect of the embodiments of the present application provides a vehicle, wherein the vehicle includes a heat pump system and a dehumidification control system of the heat pump system as described above, wherein the dehumidification control system is used to control the heat pump system.

[0037] The dehumidification control method of the heat pump system of the present application can eliminate the intervention of the high-pressure PTC heater in the dehumidification working condition, and only use the high-pressure compressor to cool and condense the passenger compartment, while using the compressor to heat the passenger compartment, and there will be no switching between high and low temperature dehumidification modes, so as to meet the dehumidification comfort and energy consumption requirements of the passenger compartment as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic structural diagram of a heat pump system according to an embodiment of the present application.

[0039] Figure 2 This is a flow chart of a control method for a heat pump system according to an embodiment of the present application.

[0040] Figure 3 This is a schematic diagram of the structure of a heat pump system according to an embodiment of the present application when absorbing waste heat from batteries.

[0041] Figure 4 This is a schematic diagram of the structure of a heat pump system according to an embodiment of the present application when absorbing waste heat from electric drive and ambient temperature.

[0042] Figure 5 This is a schematic diagram of the structure of a heat pump system according to an embodiment of the present application when storing heat in a battery.

[0043] Figure 6 A schematic diagram of the structure of a heat pump system according to an embodiment of the present application releasing heat to an electric drive circuit and an ambient heat exchange circuit.

[0044] Figure 7 This is a schematic diagram of the regulation of various components in a heat pump system under dehumidification conditions according to an embodiment of the present application.

[0045] Figure 8 A schematic block diagram of a dehumidification control system of a heat pump system according to an embodiment of the present application. DETAILED DESCRIPTION

[0046] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices consistent with some aspects of the present application as detailed in the appended claims.

[0047] The dehumidification control method, system and vehicle of the heat pump system of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can be combined with each other.

[0048] Figure 1 The schematic diagram of the structure of a heat pump system 100 according to an embodiment of the present application is disclosed. Figure 1 As shown, the heat pump system 100 includes a refrigerant circuit 110 , a passenger compartment circuit 140 , a battery circuit 150 , an electric drive circuit 160 , and an ambient heat exchange circuit 170 .

[0049] The refrigerant circuit 110 includes a first refrigerant circuit 120 and a second refrigerant circuit 130. The first refrigerant circuit 120 includes a compressor 111, a condenser 112, a first throttle valve BEXV, a chiller 113 and a second throttle valve AEXV. The exhaust port of the compressor 111 is connected to the first end of the condenser 112, the second end of the condenser 112 is connected to one end of the first throttle valve BEXV, the other end of the first throttle valve BEXV is connected to the first end of the chiller 113, the second end of the chiller 113 is connected to the air intake port of the compressor 111, the two ends of the second throttle valve AEXV are respectively connected to the air intake port and the exhaust port of the compressor 111, and the third end and the fourth end of the chiller 113 are respectively connected to the third end and the fifth end of the nine-way valve 180. The second refrigerant circuit 130 includes a third throttle valve EEXV and an evaporator 114. One end of the third throttle valve EEXV is connected to the second end of the cooler 113 , and the other end of the third throttle valve EEXV is connected to the air intake port of the compressor 111 through the evaporator 114 .

[0050] The heat pump system 100 further includes a nine-way valve 180 and a three-way valve HCTV. The refrigerant circuit 110 and the passenger compartment circuit 140 can selectively communicate with the battery circuit 150, the electric drive circuit 160 and the ambient heat exchange circuit 170 through the nine-way valve 180 and the three-way valve HCTV.

[0051] The passenger compartment circuit 140 includes a heater core Hex and a heater water pump HCWP. The heater core Hex is provided corresponding to the evaporator 114, one end of the heater water pump HCWP is connected to the third end of the condenser 112, the other end of the heater water pump HCWP is connected to one end of the heater core Hex and the second end of the nine-way valve 180, and the other end of the heater core Hex is connected to the third end of the three-way valve HCTV. The first end and the second end of the three-way valve HCTV are connected to the fourth end of the condenser 112 and the eighth end of the nine-way valve 180, respectively.

[0052] The battery circuit 150 includes a battery 151 and a battery water pump BCPF. Two ends of the battery circuit 150 are respectively connected to the fourth end and the sixth end of the nine-way valve 180 .

[0053] The electric drive circuit 160 includes an electric drive 161 and an electric drive water pump EDCP. Two ends of the electric drive circuit 160 are respectively connected to the first end and the ninth end of the nine-way valve 180.

[0054] The environment heat exchange loop 170 includes a radiator 171 , one end of the radiator 171 is connected to the seventh end of the nine-way valve 180 , and the other end of the radiator 171 is connected to the ninth end of the nine-way valve 180 and one end of the electric drive water pump EDCP.

[0055] The present application provides a dehumidification control method for a heat pump system 100 . Figure 2A flow chart of a dehumidification control method of a heat pump system 100 according to an embodiment of the present application is disclosed. Figure 2 As shown, a control method of a heat pump system 100 according to an embodiment of the present application may include steps S11 to S15.

[0056] In step S11, it is determined whether a passenger compartment dehumidification request is received. If the result of the determination is "yes", the process proceeds to step S12 and step S13. Otherwise, the process returns to step S1 to continue the determination.

[0057] In step S12 , after receiving the passenger compartment dehumidification request, a compressor cooling-side speed request may be determined based on the passenger compartment cooling demand.

[0058] In some embodiments, determining the compressor cooling-side speed request based on the passenger compartment cooling demand in step S12 may further include steps S121 to S124 .

[0059] In step S121 , a first feedforward speed of the compressor feedforward control may be obtained based on the evaporator target temperature and the air conditioner blower target air volume.

[0060] In step S122, the actual temperature of the evaporator is obtained.

[0061] In step S123 , a first feedback speed of the closed-loop feedback control of the compressor 111 may be obtained based on the actual evaporator temperature and the target evaporator temperature.

[0062] In step S124, a compressor cooling-side speed request may be obtained based on the first feedforward speed obtained in step S121 and the first feedback speed obtained in step S123.

[0063] In step S13 , the compressor heating side speed request may be determined based on the passenger compartment heating demand.

[0064] In some embodiments, determining the compressor heating-side speed request based on the passenger compartment heating demand in step S13 may further include steps S131 to S134 .

[0065] In step S131 , a second feedforward rotation speed of the compressor 111 for feedforward control may be obtained based on the warm air core target temperature and the warm air core target air volume.

[0066] In step S132 , the actual cabin water temperature of the passenger cabin circuit 140 is acquired.

[0067] In step S133, a second feedback speed of the closed-loop feedback control of the compressor 111 is obtained based on the actual cabin water temperature and the target cabin water temperature.

[0068] In step S134 , a compressor heating side speed request is obtained based on the second feedforward speed obtained in step S131 and the second feedback speed obtained in step S133 .

[0069] In step S14, the larger one of the compressor cooling-side rotation speed request and the compressor heating-side rotation speed request is taken as the compressor target rotation speed request.

[0070] In step S15 , the compressor 111 may be controlled based on the compressor target speed request.

[0071] The dehumidification control method of the heat pump system 100 of the present application can eliminate the intervention of the high-voltage PTC heater in the dehumidification working condition, and only use the high-pressure compressor 111 to cool and condense the passenger compartment, while using the compressor 111 to heat the passenger compartment, and there will be no switching between high and low temperature dehumidification modes, thereby meeting the dehumidification comfort and energy consumption requirements of the passenger compartment as much as possible.

[0072] The dehumidification control method of the heat pump system 100 of the present application takes the larger of the speed request on the cooling side of the compressor and the speed request on the heating side of the compressor. A single compressor can meet the dehumidification needs in spring and autumn. The same set of logic is used, and there is no switching between high and low temperature dehumidification. The control is smoother, which greatly simplifies the complexity of the software.

[0073] Continue to refer to Figure 2 In some embodiments, the dehumidification control method of the heat pump system 100 of the present application may further include step S21 and step S22.

[0074] In step S21, it is determined whether the cooling and heating temperatures reach the target temperatures at the same time, that is, whether the actual evaporator temperature is equal to the evaporator target temperature, or whether the actual cabin water temperature is equal to the cabin target water temperature.

[0075] When there is excess cooling capacity or insufficient heating capacity, that is, the actual evaporator temperature is higher than the evaporator target temperature, or the actual cabin water temperature is lower than the cabin target water temperature, the process proceeds to step S22. In step S22, the first throttle valve BEXV is controlled to open.

[0076] In some embodiments, the dehumidification control method of the heat pump system 100 of the present application may further include steps S23 to S25.

[0077] In step S23, the battery temperature of the vehicle is obtained to determine whether there is residual heat in the battery 151. If the result of the determination is "yes", the process proceeds to step S24. Otherwise, the process proceeds to step S25.

[0078] In step S24, when the battery temperature is higher than the first preset battery temperature threshold, it can be determined that the battery 151 has waste heat for utilization. At this time, the heat pump system 100 can be controlled to be in Figure 3The battery waste heat absorption mode shown can connect the battery circuit 150 and the refrigerant circuit 110 through the nine-way valve 180, control the battery circuit 150 to release heat to the refrigerant circuit 110, thereby supplementing heat to the passenger compartment and reducing the battery temperature.

[0079] In step S25, when the battery temperature is not higher than the first preset battery temperature threshold, it can be determined that the battery 151 has no residual heat to utilize. At this time, the heat pump system 100 can be controlled to be in Figure 4 The mode of absorbing electric drive waste heat and ambient temperature shown in the figure can connect the electric drive circuit 160 and the ambient heat exchange circuit 170 in series through the nine-way valve 180, and connect them with the refrigerant circuit 110 through the nine-way valve 180. The electric drive circuit 160 and the ambient heat exchange circuit 170 connected in series can be controlled to release heat to the refrigerant circuit 110, thereby supplementing heat for the passenger compartment and reducing the electric drive temperature at the same time.

[0080] In some embodiments, the dehumidification control method of the heat pump system 100 of the present application may further include step S26.

[0081] When the cooling capacity is insufficient or the heat is excessive, that is, when the actual evaporator temperature is lower than the evaporator target temperature, or the actual cabin water temperature is higher than the cabin target water temperature, the process proceeds to step S26. In step S26, the first throttle valve BEXV is controlled to close, and the opening of the three-way valve HCTV is controlled based on the cabin target water temperature.

[0082] In some embodiments, the dehumidification control method of the heat pump system 100 of the present application may further include steps S27 to S29.

[0083] In step S27, the battery temperature of the vehicle is obtained to determine whether the battery 151 can store heat. If the result of the determination is "yes", the process proceeds to step S28. Otherwise, the process proceeds to step S29.

[0084] In step S28, when the battery temperature is lower than the second preset battery temperature threshold, it can be determined that the battery 151 can store heat. At this time, the heat pump system 100 can be controlled to be in Figure 5 The battery heat storage mode shown can control the passenger compartment circuit 140 to be connected to the battery circuit 150 through the nine-way valve 180 and the three-way valve HCTV, and control the passenger compartment circuit 140 to release heat to the battery circuit 150, so that excess heat can be dissipated to the battery 151.

[0085] In step S29, when the battery temperature is not lower than the second preset battery temperature threshold, it is determined that the battery 151 cannot store heat. At this time, the heat pump system 100 can be controlled to be in Figure 6The mode of releasing heat to the electric drive circuit 160 and the environmental heat exchange circuit 170 shown can control the electric drive circuit 160 and the environmental heat exchange circuit 170 to be connected in series and connected to the passenger compartment circuit 140 through the nine-way valve 180 and the three-way valve HCTV, and can control the passenger compartment circuit 140 to release heat to the electric drive circuit 160 and the environmental heat exchange circuit 170 connected in series, so that excess heat can be dissipated to the electric drive 161 and the environment.

[0086] The dehumidification control method of the heat pump system 100 of the present application eliminates the intervention of the high-voltage PTC heater in the dehumidification condition, and takes the optimal utilization of energy among the battery 151, the electric drive 161, the passenger compartment, and the environment as the principle. Combined with the structure of the nine-way valve 180, it can realize the unlimited transfer of heat among the electric drive 161, the battery 151, the radiator 171, the condenser 112, and the heater core Hex, thereby reducing the energy consumption of the system.

[0087] The following will be combined Figure 7 The following describes in detail how the various valves, water pumps, fans and other components in the heat pump system 100 of the present application are adjusted under dehumidification conditions.

[0088] Figure 7 The present invention discloses a schematic diagram of adjusting various components in a heat pump system 100 under dehumidification conditions according to an embodiment of the present invention. Figure 7 As shown, in some embodiments, the dehumidification control method of the heat pump system 100 of the present application may further include step S30. In step S30, the opening degree of the first throttle valve BEXV is controlled.

[0089] In some embodiments, step S30 may further include steps S31 to S33.

[0090] In step S31, low pressure control: according to the evaporator target temperature, the corresponding evaporator saturation pressure can be obtained by consulting the refrigerant property table, and then, the first opening of the first throttle valve BEXV closed-loop low-pressure control can be obtained by biasing the evaporator saturation pressure downward by a predetermined pressure value.

[0091] In step S32, superheat control: obtain the compressor suction superheat and the compressor exhaust superheat, and then, the second opening of the first throttle valve BEXV closed-loop superheat control can be obtained based on the compressor suction superheat and the compressor exhaust superheat. Specifically, the actual suction pressure of the compressor, the actual suction temperature of the compressor, the actual exhaust pressure of the compressor and the actual exhaust temperature of the compressor are obtained; according to the actual suction pressure of the compressor, the saturation temperature corresponding to the actual suction pressure of the compressor can be obtained by consulting the refrigerant property table, and according to the actual exhaust pressure of the compressor, the saturation temperature corresponding to the actual exhaust pressure of the compressor can be obtained by consulting the refrigerant property table; then, the actual suction superheat of the compressor can be obtained by subtracting the saturation temperature corresponding to the actual suction pressure of the compressor from the actual suction temperature of the compressor, and the actual exhaust superheat of the compressor can be obtained by subtracting the saturation temperature corresponding to the actual exhaust pressure of the compressor from the actual exhaust temperature of the compressor. The smaller of the opening of the first throttle valve BEXV closed-loop control obtained according to the compressor suction superheat and the opening of the first throttle valve BEXV obtained according to the compressor exhaust superheat can be used as the second opening of the first throttle valve BEXV closed-loop superheat control.

[0092] In step S33 , the first throttle valve BEXV is controlled at the smaller of the first opening degree obtained in step S31 and the second opening degree obtained in step S32 .

[0093] The radiator 171 includes a fan. In some embodiments, the dehumidification control method of the heat pump system 100 of the present application may further include step S40. In step S40, the rotation speed of the fan is controlled.

[0094] In some embodiments, step S40 may further include steps S41 to S43.

[0095] In step S41, heat pump demand: the first speed of the fan can be determined according to the heat pump demand.

[0096] In step S42 , electric drive heat dissipation: the second speed of the fan can be determined according to the heat dissipation requirement of the electric drive 161 in the electric drive circuit 160 .

[0097] In step S43, HCTV opens high pressure heat dissipation: when the difference between the actual cabin water temperature and the absolute cabin water temperature is less than the predetermined value, or the difference between the target cabin water temperature and the actual cabin water temperature is higher than the predetermined value, it means that the cabin water temperature is too high in absolute state or too high in relative state. At this time, the three-way valve HCTV can be controlled to open to dissipate heat through the environmental heat exchange circuit 170, and the smaller of the difference between the absolute cabin water temperature and the predetermined temperature value and the sum of the target cabin water temperature and the predetermined temperature value, for example, min (absolute cabin water temperature -5 degrees, relative cabin water temperature +5 degrees) can be taken as the target to obtain the third speed of the fan closed loop control. Otherwise, that is, when the above-mentioned conditions of the cabin water temperature being too high in absolute state and the cabin water temperature being too high in relative state are not met, the three-way valve HCTV is controlled to close, and at this time, the third speed is 0.

[0098] In step S44, the fan is controlled at the larger of the first rotation speed obtained in step S41, the second rotation speed obtained in step S42, and the third rotation speed obtained in step S43.

[0099] In some embodiments, the dehumidification control method of the heat pump system 100 of the present application may further include step S50. In step S50, heating flow control: the rotation speed of the heater water pump HCWP may be determined based on the heating demand of the passenger compartment, and then the heater water pump HCWP may be controlled based on the rotation speed of the heater water pump HCWP.

[0100] In some embodiments, the dehumidification control method of the heat pump system 100 of the present application may further include step S50. In step S60, the opening degree of the third throttle valve EEXV is controlled.

[0101] In some embodiments, step S60 may further include steps S61 to S63.

[0102] In step S61, evaporation temperature difference control: a first opening degree of the third throttle valve EEXV closed-loop control can be obtained based on the actual evaporator temperature and the evaporator target temperature.

[0103] In step S62, the evaporation superheat control: the compressor speed and the actual superheat of the evaporator are obtained, and the feedforward opening of the third throttle valve EEXV feedforward control can be obtained based on the compressor speed, and the feedback opening of the closed-loop feedback control of the third throttle valve EEXV can be obtained based on the actual superheat of the evaporator and the target superheat of the evaporator; then, the second opening of the third throttle valve EEXV can be obtained based on the feedforward opening and the feedback opening.

[0104] In step S63, the third throttle valve EEXV is controlled at the smaller of the first opening degree obtained in step S61 and the second opening degree obtained in step S62.

[0105] In some embodiments, the dehumidification control method of the heat pump system 100 of the present application may further include step S70. In step S70, the rotation speed of the battery water pump BCPF is controlled.

[0106] In some embodiments, step S70 may further include steps S71 to S74.

[0107] In step S71 , BEXV opens the water pump speed: when the first throttle valve BEXV is opened to absorb heat from the battery circuit 150 , a first speed of the battery water pump BCPF is determined based on actual demand.

[0108] In step S72 , the battery 151 requires a water pump speed: a second speed of the battery water pump BCPF may be obtained based on the battery 151's own requirements.

[0109] In step S73 , HCTV opens the water pump speed: when the three-way valve HCTV is opened to release heat to the battery circuit 150 , a third speed of the battery water pump BCPF is determined based on actual demand.

[0110] In step S74 , the battery water pump BCPF is controlled at the larger of one of the first rotation speed obtained in step S71 and the third rotation speed obtained in step S73 and the second rotation speed obtained in step S72 .

[0111] In some embodiments, the dehumidification control method of the heat pump system 100 of the present application may further include step S80. In step S80, the rotation speed of the electric drive water pump EDCP is controlled.

[0112] In some embodiments, step S80 may further include steps S81 to S83.

[0113] In step S81 , the heat pump requires heat dissipation: when the first throttle valve BEXV is opened to absorb heat from the electric drive circuit 160 , a first rotation speed of the electric drive water pump EDCP can be obtained according to the heat pump requirement.

[0114] In step S82 , the electric drive 161 requires heat dissipation: the second rotational speed of the electric drive water pump EDCP may be obtained based on the heat dissipation requirement of the electric drive 161 itself.

[0115] In step S83 , the electric water pump EDCP is controlled at the larger of the first rotation speed obtained in step S81 and the second rotation speed obtained in step S82 .

[0116] In the dehumidification condition, the heat pump system 100 is controlled to enter Figures 3 to 6 After the corresponding mode in Figure 7The various components in the heat pump system 100 are controlled accordingly, so that the cabin water temperature and the evaporator 114 temperature can reach the target temperature.

[0117] The dehumidification control method of the heat pump system 100 of the present application can adjust the first throttle valve BEXV under dehumidification conditions when the cabin has excess cooling and insufficient heat, and use the cooler (chiller) 113 to absorb the residual heat of the electric drive circuit 160 + ambient temperature or the battery 151, so as to increase the evaporation temperature and prevent evaporation and frosting, and also reduce the electric drive temperature or the battery temperature; when the cabin has excess heat and insufficient cooling, the three-way valve HCTV is opened, and the residual heat is dissipated to the battery 151 or dissipated into the air, ensuring that the battery 151 operates in a better temperature range, and the heat is stored in the battery 151, which can be released again later according to the working conditions to provide additional heat to the passenger compartment.

[0118] The present application also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the dehumidification control method for the heat pump system described above are implemented.

[0119] The present application also provides a dehumidification control system 200 for a heat pump system. Figure 8 A schematic block diagram of a dehumidification control system of a heat pump system according to an embodiment of the present application is disclosed. Figure 6 As shown, a dehumidification control system 200 of a heat pump system of an embodiment of the present application includes a processor 201, an internal bus 202, a network interface 203, a memory 204, and a non-volatile memory 205, and may also include hardware required for other services. The processor 201 can read the corresponding computer program from the non-volatile memory 205 into the memory 204 and then run it to implement the steps of the dehumidification control method of the heat pump system as described above. Of course, in addition to the software implementation, the present application does not exclude other implementation methods, such as logic devices or a combination of software and hardware, etc., that is to say, the execution subject of the following processing flow is not limited to each logic unit, but can also be hardware or logic components.

[0120] The dehumidification control system 200 of the heat pump system of the present application can have beneficial technical effects similar to the dehumidification control method of the heat pump system described above, so it will not be described in detail here.

[0121] The present application also provides a vehicle. The vehicle includes a heat pump system 100 and a dehumidification control system 200 of the heat pump system as described above. The dehumidification control system 200 can control the heat pump system 100.

[0122] The above is a detailed introduction to the dehumidification control method, system, storage medium and vehicle of the heat pump system provided in the embodiment of the present application. Specific examples are used herein to illustrate the dehumidification control method, system, storage medium and vehicle of the heat pump system in the embodiment of the present application. The description of the above embodiments is only used to help understand the core idea of ​​the present application and is not intended to limit the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the spirit and principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications should also fall within the scope of protection of the claims attached to the present application.

Claims

1. A dehumidification control method for a heat pump system, characterized in that: The method comprises: After receiving a passenger compartment dehumidification request, determining a compressor cooling side speed request based on a passenger compartment cooling demand; determining a compressor hot-side speed request based on a passenger compartment heating demand; taking the larger of the compressor cooling side speed request and the compressor heating side speed request as the compressor target speed request; and The compressor is controlled based on the compressor target speed request.

2. The method according to claim 1, characterized in that The step of determining the compressor cooling side speed request based on the passenger compartment cooling demand includes: Obtaining a first feedforward speed of the compressor feedforward control based on an evaporator target temperature and an air conditioner blower target air volume; Get the actual temperature of the evaporator; Obtaining a first feedback speed of the compressor closed-loop feedback control based on the actual evaporator temperature and the target evaporator temperature; and The compressor cooling side speed request is obtained based on the first feedforward speed and the first feedback speed, The step of determining the compressor heating side speed request based on the passenger compartment heating demand includes: obtaining a second feedforward speed of the compressor feedforward control based on a target heater core temperature and a target heater core air volume of a passenger compartment circuit; obtaining an actual cabin water temperature of the passenger cabin circuit; Obtaining a second feedback speed of the compressor closed-loop feedback control based on the actual cabin water temperature and the target cabin water temperature; and The compressor hot-side speed request is obtained based on the second feed-forward speed and the second feedback speed.

3. The method according to claim 2, characterized in that The heat pump system includes a first throttle valve, one end of the first throttle valve is connected to the exhaust port of the compressor through a condenser, and the other end of the first throttle valve is connected to the intake port of the compressor through a cooler. The method further includes: When the actual evaporator temperature is higher than the target evaporator temperature, or the actual cabin water temperature is lower than the target cabin water temperature, it is determined that there is excess cooling or insufficient heating, and the first throttle valve is controlled to open; When the actual evaporator temperature is lower than the evaporator target temperature, or the actual cabin water temperature is higher than the cabin target water temperature, it is determined that there is insufficient cooling capacity or excess heat, and the first throttle valve is controlled to be closed.

4. The method according to claim 3, characterized in that Also includes: Get the vehicle's battery temperature; When the battery temperature is higher than a first preset battery temperature threshold, it is determined that the battery has waste heat to be utilized, and the battery circuit is controlled to release heat to the refrigerant circuit, thereby supplementing the heat for the passenger compartment; When the battery temperature is not higher than the first preset battery temperature threshold, it is determined that the battery has no residual heat to be utilized, and the electric drive circuit and the environmental heat exchange circuit are controlled to be connected in series and release heat to the refrigerant circuit, thereby supplementing the heat for the passenger compartment; When the battery temperature is lower than a second preset battery temperature threshold, it is determined that the battery can store heat, and the passenger compartment circuit is controlled to release heat to the battery circuit; and When the battery temperature is not lower than the second preset battery temperature threshold, it is determined that the battery cannot store heat, and the passenger compartment circuit is controlled to release heat to the electric drive circuit and the environmental heat exchange circuit connected in series.

5. The method according to claim 3, characterized in that Also includes: Controlling the opening of the first throttle valve includes: According to the evaporator target temperature, the corresponding evaporator saturation pressure is obtained by consulting the refrigerant property table; Obtaining a first opening degree of the first throttle valve closed-loop low-pressure control according to the evaporator saturation pressure being offset downward by a predetermined pressure value; Obtain compressor suction superheat and compressor exhaust superheat; obtaining a second opening degree of the first throttle valve closed-loop superheat control based on the compressor suction superheat and the compressor exhaust superheat; and The first throttle valve is controlled at a smaller opening between the first opening and the second opening.

6. The method according to claim 4, characterized in that The environmental heat exchange loop includes a radiator, the radiator includes a fan, and the method further includes: Controlling the rotation speed of the fan includes: determining a first speed of the fan according to a heat pump demand; Determining a second speed of the fan according to a heat dissipation requirement of the electric drive in the electric drive circuit; When the difference between the actual cabin water temperature and the absolute cabin water temperature is less than a predetermined value, or the difference between the target cabin water temperature and the actual cabin water temperature is higher than a predetermined value, the ambient heat exchange circuit is controlled to dissipate heat, and the third speed of the fan closed-loop control is obtained by taking the smaller of the difference between the absolute cabin water temperature and the predetermined temperature value and the sum of the target cabin water temperature and the predetermined temperature value as a target; when the above conditions are not met, the third speed is controlled to be 0; and The fan is controlled at a larger speed among the first speed, the second speed, and the third speed.

7. The method according to claim 4, characterized in that The heat pump system further includes a third throttle valve, one end of the third throttle valve is connected to the cooler, and the other end of the third throttle valve is connected to the air intake port of the compressor through the evaporator. The method further includes: Controlling the opening of the third throttle valve includes: obtaining a first opening degree of the third throttle valve closed-loop control based on the actual evaporator temperature and the target evaporator temperature; Get the compressor speed and actual evaporator superheat; obtaining a feedforward opening of the third throttle valve feedforward control based on the compressor speed; Obtaining a feedback opening of the third throttle valve closed-loop feedback control based on the actual superheat of the evaporator and the target superheat of the evaporator; obtaining a second opening of the third throttle valve based on the feedforward opening and the feedback opening; and The third throttle valve is controlled at a smaller one of the first opening degree and the second opening degree.

8. The method according to claim 4, characterized in that The battery circuit includes a battery water pump, the electric drive circuit includes an electric drive water pump, and the method further includes: Controlling the rotation speed of the battery water pump includes: When the first throttle valve is opened to absorb heat from the battery circuit, determining a first rotation speed of the battery water pump based on actual demand; Obtaining a second rotation speed of the battery water pump based on the battery's own requirements; When dissipating heat to the battery circuit, determining a third speed of the battery water pump based on actual demand; and Controlling the battery water pump at a larger speed between one of the first speed and the third speed and the second speed; Controlling the rotation speed of the electric drive water pump comprises: When the first throttle valve is opened to absorb heat from the electric drive circuit, a first rotation speed of the electric drive water pump is obtained according to a heat pump demand; Obtaining a second rotation speed of the electric drive water pump based on the heat dissipation requirement of the electric drive itself; and The electric water pump is controlled at the larger of the first rotational speed and the second rotational speed.

9. A dehumidification control system for a heat pump system, characterized in that: The method comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the dehumidification control method for the heat pump system as described in any one of claims 1 to 8 when executing the computer program.

10. A vehicle, characterized in that: It comprises a heat pump system and a dehumidification control system of the heat pump system as claimed in claim 9, wherein the dehumidification control system is used to control the heat pump system.

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