Vehicle air conditioning system, control method thereof and vehicle

Abstract

The invention provides a vehicle air conditioning system, a control method thereof and a vehicle, and relates to the technical field of air conditioners. Based on current temperature information, a heating module is controlled to heat a battery of the vehicle in a first working mode; the first working mode comprises at least one of a motor locked-rotor heating mode, a single-stage compression heating mode and a two-stage compression heating mode; when the current state meets the passenger compartment heating condition, the heating module is controlled to heat the passenger compartment of the vehicle in a second working mode, and the second working mode comprises a two-stage compression heating mode or a combination of the two-stage compression heating mode and a motor locked-rotor heating mode; the current state comprises at least one of the air conditioner state and the current temperature information, and by means of motor locked-rotor heating, single-stage compression heating and two-stage compression heating, vehicle heat control is achieved, vehicle driving comfort is achieved, the energy consumption of the whole vehicle is reduced, and the endurance in winter is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning, in particular to a vehicle air conditioning system, a control method thereof and a vehicle. BACKGROUND

[0002] The sales of new energy vehicles are increasing year by year, and the use of vehicles in public areas is fully electrified, which clearly defines the main position of electric vehicles in the overall development goal of the industry. However, if a high-quality pure electric vehicle model with high market acceptance and customer acceptance is to be produced, it is necessary to focus on solving the customer's "range anxiety", especially the pain point of serious winter range degradation, and better solve the problem of winter vehicle ride comfort, which requires better heat distribution and control to achieve precise heat control.

[0003] The winter range degradation of pure electric vehicles mainly includes the direct impact of low temperature on the available capacity of the battery pack, and the heat source of the winter heating air conditioner of the pure electric vehicle comes from electric energy rather than engine waste heat. When the temperature is extremely low (less than -10℃), only positive temperature coefficient (PTC) thermistor heating can be used to meet the air conditioning heating demand, which sharply increases the power consumption, resulting in a decrease in the range of the whole vehicle. SUMMARY

[0004] Therefore, the embodiments of the present application are dedicated to providing a vehicle air conditioning system, a control method thereof and a vehicle, which realize vehicle ride comfort, reduce the energy consumption of the whole vehicle, and increase the range.

[0005] To achieve the above technical purposes, the embodiments of the present application provide the following technical solutions: In a first aspect, the embodiments of the present application provide a control method of a vehicle air conditioning system, the vehicle air conditioning system comprising a heating module, the heating module comprising an electric motor and a two-stage compressor, the two-stage compressor comprising a first-stage compressor; the control method comprising: based on current temperature information, controlling the heating module to heat a battery of a vehicle in a first working mode; the current temperature information comprising a current ambient temperature, a current battery temperature, and a current outlet temperature of the first-stage compressor; the first working mode comprising at least one of an electric motor locked-rotor heating mode, a single-stage compression heating mode, and a two-stage compression heating mode; when a current state satisfies a passenger compartment heating condition, controlling the heating module to heat a passenger compartment of the vehicle in a second working mode, the second working mode comprising a two-stage compression heating mode or a combination of a two-stage compression heating mode and an electric motor locked-rotor heating mode; the current state comprising at least one of an air conditioning state and the current temperature information.

[0006] In the embodiment, the vehicle heat control is realized by adjusting one of the motor locked-rotor heating mode, the single-stage compression heating mode and the two-stage compression heating mode to heat the battery and / or the passenger compartment according to the current environment temperature, the current battery temperature and the current outlet temperature of the first compressor, the vehicle driving comfort is realized, the vehicle energy consumption is reduced and the winter range is increased.

[0007] Optionally, the determining the first working mode based on the current temperature information and controlling the heating module to heat the battery of the vehicle in the first working mode comprises: if the current environment temperature is less than or equal to the first environment temperature threshold, controlling the heating module to heat the battery of the vehicle in the motor locked-rotor heating mode and the two-stage compression heating mode according to the current battery temperature and the current outlet temperature; if the current environment temperature is greater than the first environment temperature threshold and less than or equal to the third environment temperature threshold, controlling the heating module to heat the battery of the vehicle in the two-stage compression heating mode according to the current battery temperature and the current outlet temperature; and if the current environment temperature is greater than the third environment temperature threshold, controlling the heating module to heat the battery of the vehicle in the single-stage compression heating mode by starting the first-stage compressor to start the heat pump heating.

[0008] In the embodiment, the motor locked-rotor heating mode consumes a large amount of energy, so the motor locked-rotor heating mode and the two-stage compression heating mode are applied to heat the battery of the vehicle only when the current environment temperature is less than or equal to the first environment temperature threshold, the heat priority is adjusted, the vehicle energy consumption is reduced, the battery of the vehicle is heated in the two-stage compression heating mode when the current environment temperature is greater than the first environment temperature threshold and less than or equal to the third environment temperature threshold, the first-stage compressor is started to start the heat pump heating to heat the battery of the vehicle when the current environment temperature is greater than the third environment temperature threshold, the vehicle heat control is realized, the vehicle energy consumption is reduced and the winter range is increased.

[0009] Optionally, the heating module further comprises a heat pump heat exchanger, a water-cooled condenser and a Chiller heat exchanger; the dual-stage compressor further comprises a second-stage compressor; and the method of controlling the heating module to heat the battery of the vehicle in the motor locked-rotor heating mode and the dual-stage compressor heating mode according to the current battery temperature and the current outlet temperature when the current ambient temperature is less than or equal to the first ambient temperature threshold comprises: controlling the battery heating and the heat pump heat exchanger heat storage in the motor locked-rotor heating mode when the current ambient temperature is less than or equal to the first ambient temperature threshold; controlling the heat pump heating of the dual-stage compressor to be turned on when the battery heating reaches the current battery temperature greater than or equal to the first battery temperature threshold, and controlling the first-stage compressor to compress the refrigerant to flow through the heat pump heat exchanger into the second-stage compressor, so that the refrigerant absorbs the heat of the heat pump heat exchanger; and controlling the battery heating in the dual-stage compressor heating mode according to the current outlet temperature until the current outlet temperature is greater than or equal to the first outlet temperature threshold, wherein the motor locked-rotor heating mode is turned off when the current outlet temperature is greater than or equal to the second outlet temperature threshold; and controlling the first-stage compressor to compress the refrigerant to flow through the water-cooled condenser and the Chiller heat exchanger for heat storage only, so as to heat the battery until the battery heating reaches the current battery temperature greater than or equal to the second battery temperature threshold when the current outlet temperature is greater than or equal to the first outlet temperature threshold.

[0010] In the present embodiment, when the current ambient temperature is less than or equal to the first ambient temperature threshold, the motor locked-rotor heating mode is first applied to heat the battery so that the battery can be discharged, and then the dual-stage compressor heating mode is performed until the battery heating reaches the current battery temperature greater than or equal to the second battery temperature threshold, so as to reduce the energy consumption of the whole vehicle and increase the winter range; the motor locked-rotor heating mode is turned off when the dual-stage compressor can generate sufficient heat, i.e., the dual-stage compressor heating mode is preferably used, and the motor locked-rotor heating mode is only used when necessary, so as to realize the heat control of the vehicle by adjusting the heat priority.

[0011] Optionally, the controlling the battery to be heated in the dual-stage compressor heating mode according to the current outlet temperature until the current outlet temperature is greater than or equal to a first outlet temperature threshold, if the current outlet temperature is greater than or equal to a second outlet temperature threshold, includes: if the current outlet temperature is less than the second outlet temperature threshold, controlling the heat pump heating of the dual-stage compressor to be turned on, and controlling the first-stage compressor to compress the refrigerant and then make the refrigerant flow through the heat pump heat exchanger and enter the second-stage compressor, so that the refrigerant absorbs heat of the heat pump heat exchanger; if the current outlet temperature is greater than or equal to the second outlet temperature threshold and less than the first outlet temperature threshold, turning off the motor locked-rotor heating mode, and controlling the first-stage compressor to compress the refrigerant and then make the refrigerant directly enter the second-stage compressor, and controlling the refrigerant compressed by the dual-stage compressor to flow through the water-cooled condenser and the Chiller heat exchanger which are only used for heat storage, so as to heat the battery.

[0012] In the embodiment, by first storing heat in the heat pump heat exchanger in the dual-stage compressor heating mode, a high-temperature and high-pressure circulation of the dual-stage compressor is established, and the dual-stage compressor in the high-temperature and high-pressure circulation can achieve better heating effect, so that the vehicle heat control can be realized and the energy consumption of the vehicle can be reduced.

[0013] Optionally, the heating module further includes a heat pump heat exchanger, a water-cooled condenser and a Chiller heat exchanger; the dual-stage compressor further includes a second-stage compressor; and the controlling the battery to be heated in the dual-stage compression heating mode according to the current battery temperature and the current outlet temperature if the current ambient temperature is greater than the first ambient temperature threshold and less than or equal to a third ambient temperature threshold, includes: if the current ambient temperature is greater than the first ambient temperature threshold and less than or equal to a second ambient temperature threshold, controlling the heat pump heating of the dual-stage compressor to be turned on, and controlling the first-stage compressor to compress the refrigerant and then make the refrigerant directly enter the second-stage compressor, and controlling the refrigerant compressed by the dual-stage compressor to flow through the water-cooled condenser and the Chiller heat exchanger which are only used for heat storage, so as to heat the battery; if the battery is heated to the current battery temperature being greater than or equal to a first battery temperature threshold and the current outlet temperature being greater than or equal to a first outlet temperature threshold, controlling the first-stage compressor to compress the refrigerant and then make the refrigerant flow through the water-cooled condenser and the Chiller heat exchanger which are only used for heat storage, so as to heat the battery until the battery is heated to the current battery temperature being greater than or equal to a second battery temperature threshold.

[0014] In the embodiment, when the current environment temperature is greater than the first environment temperature threshold and less than or equal to the second environment temperature threshold, the battery is directly heated in the dual-stage compressor heating mode to improve the discharge capacity of the battery until the current battery temperature is greater than or equal to the second battery temperature threshold, so that the vehicle heat control can be realized, the energy consumption of the vehicle is reduced, and the winter endurance is increased.

[0015] Optionally, the heating module further comprises a warm air core and a blower; and the control of the heating module in the second working mode to heat the passenger compartment of the vehicle when the current state meets the passenger compartment heating condition comprises: the control of the first-stage compressor to compress the refrigerant to flow through the water-cooled condenser and the Chiller heat exchanger, the control of a warm air pump to be turned on, and the heat exchange between the heat generated by the first-stage compressor and the heat of the warm air core; if the battery is heated to the current battery temperature greater than or equal to the second battery temperature threshold, the control of the dual-stage compressor to compress the refrigerant to flow through the water-cooled condenser and the Chiller heat exchanger to heat the passenger compartment; and the control of the heat generated by the first-stage compressor to heat the warm air core through the heat pump heat exchanger to heat and keep warm the passenger compartment.

[0016] In the embodiment, the water-cooled condenser directly exchanges heat with the passenger compartment, and the blower is used to realize the heat exchange between the warm air core and the passenger compartment, so that the rapid heating and keeping warm of the passenger compartment are realized, and the driving comfort of the vehicle is realized.

[0017] Optionally, the heating module further comprises a heat pump heat exchanger, a water-cooled condenser, a Chiller heat exchanger and a warm air core; and the dual-stage compressor further comprises a second-stage compressor; and the control of the heating module in the dual-stage compression heating mode to heat the battery of the vehicle according to the current battery temperature and the current outlet temperature when the current environment temperature is greater than the first environment temperature threshold and less than or equal to the third environment temperature threshold further comprises: if the current environment temperature is greater than the second environment temperature threshold and less than or equal to the third environment temperature threshold, the control of the heat pump heating of the dual-stage compressor to be turned on, the control of the first-stage compressor to compress the refrigerant to flow through the heat pump heat exchanger and enter the second-stage compressor, and the control of the dual-stage compressor to compress the refrigerant to flow through the water-cooled condenser and the Chiller heat exchanger to heat the battery and the warm air core.

[0018] In the embodiment, when the current environment temperature is greater than the second environment temperature threshold and less than or equal to the third environment temperature threshold, the heat required by the battery for temperature rise and discharge is not large, but the temperature of the passenger compartment is not high, which affects the driving comfort, so the battery and the passenger compartment can be heated in the dual-stage compression heating mode, the vehicle heat control and the driving comfort of the vehicle can be realized, the energy consumption of the vehicle is reduced, and the winter endurance is increased.

[0019] Optionally, when the current state meets the passenger compartment heating condition, the heating module is controlled to heat the passenger compartment of the vehicle in a second working mode, and the second working mode includes a double-stage compression heating mode, or a combination of the double-stage compression heating mode and the motor locked-rotor heating mode, including: controlling the double-stage compressor to compress the refrigerant to flow through the water-cooled condenser and the Chiller heat exchanger, and then controlling the first-stage compressor to compress the heat to heat the heat pump heat exchanger and the heater core, and controlling the air blower to be turned on to heat the passenger compartment.

[0020] In this embodiment, the passenger compartment is heated by exchanging heat between the heater core and the passenger compartment, which can realize vehicle heat control and improve vehicle driving comfort.

[0021] Optionally, the heating module further includes a heat pump heat exchanger, a water-cooled condenser, a Chiller heat exchanger, and a heater core; the double-stage compressor further includes a second-stage compressor; when the current state meets the passenger compartment heating condition, the heating module is controlled to heat the passenger compartment of the vehicle in a second working mode, and the second working mode includes a double-stage compression heating mode, or a combination of the double-stage compression heating mode and the motor locked-rotor heating mode, further including: if the air conditioner state is that the user increases the passenger compartment temperature or the air conditioner is turned on by the user, the passenger compartment is preferentially heated; controlling the double-stage compressor to compress the refrigerant to flow through the water-cooled condenser and the Chiller heat exchanger to heat the battery and the heater core, and controlling the motor locked-rotor heating to flow through the heat pump heat exchanger and the heater core; monitoring the air conditioner outlet temperature of the passenger compartment; if the air conditioner outlet temperature rises to the target temperature, the motor locked-rotor heating mode is turned off, the double-stage compressor is controlled to compress the refrigerant to flow through the water-cooled condenser and the Chiller heat exchanger to heat the battery and the passenger compartment, and the first-stage compressor is controlled to compress the heat to heat the heat pump heat exchanger and the heater core to heat and keep warm the passenger compartment.

[0022] In this embodiment, when the passenger compartment has an emergency heating demand, the passenger compartment heating is preferentially controlled, and at this time, the battery and the passenger compartment are heated simultaneously in the motor locked-rotor heating mode and the double-stage compressor heating mode until the air conditioner outlet temperature of the passenger compartment reaches the target temperature, and then the motor locked-rotor heating is turned off, and the battery and the passenger compartment are heated and kept warm only by the double-stage compressor heating. By adjusting the heat priority, vehicle heat control can be realized, vehicle driving comfort can be improved, vehicle energy consumption can be reduced, and winter range can be increased.

[0023] In a second aspect, the embodiments of the present application also provide a vehicle air conditioning system, comprising: a heating module, the heating module comprising a motor and a two-stage compressor, the two-stage compressor comprising a first-stage compressor; the vehicle air conditioning system further comprises: a controller, configured to: control the heating module to heat a battery of a vehicle in a first working mode based on current temperature information, the current temperature information comprising: a current ambient temperature, a current battery temperature, and a current outlet temperature of the first-stage compressor; the first working mode comprising at least one of: a motor locked-rotor heating mode, a single-stage compression heating mode, and a two-stage compression heating mode; when a current state satisfies a passenger compartment heating condition, control the heating module to heat a passenger compartment of the vehicle in a second working mode, the second working mode comprising the two-stage compression heating mode, or a combination of the two-stage compression heating mode and the motor locked-rotor heating mode; the current state comprising at least one of an air conditioning state and the current temperature information.

[0024] In a third aspect, the embodiments of the present application also provide a vehicle air conditioning system, the vehicle comprising: the vehicle air conditioning system described above.

[0025] It can be seen from the above technical solutions that the control method of the vehicle air conditioning system provided by the embodiments of the present application controls the heating module to heat the battery of the vehicle in the first working mode based on the current temperature information, the current temperature information comprising: the current ambient temperature, the current battery temperature, and the current outlet temperature of the first-stage compressor; the first working mode comprising at least one of: the motor locked-rotor heating mode, the single-stage compression heating mode, and the two-stage compression heating mode; when the current state satisfies the passenger compartment heating condition, the heating module is controlled to heat the passenger compartment of the vehicle in the second working mode, the second working mode comprising the two-stage compression heating mode, or a combination of the two-stage compression heating mode and the motor locked-rotor heating mode; the current state comprising at least one of the air conditioning state and the current temperature information, according to the current ambient temperature, the current battery temperature, and the current outlet temperature of the first-stage compressor, one of the motor locked-rotor heating mode, the single-stage compression heating mode, and the two-stage compression heating mode is adjusted to heat the battery and / or the passenger compartment, so as to realize vehicle heat control, improve vehicle ride comfort, reduce vehicle energy consumption, and increase winter range.

[0026] The above description is only a summary of the technical solutions of the present disclosure. In order to enable a more clear understanding of the technical means of the present disclosure, the specific embodiments of the present disclosure are described in detail according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present disclosure more obvious and easy to understand, the following specific embodiments of the present disclosure are described. BRIEF DESCRIPTION OF DRAWINGS

[0027] Various other advantages and benefits will become apparent to those of ordinary skill in the art, upon reading the following detailed description of the preferred embodiment. The accompanying drawings are included to provide a description of preferred embodiments, and are not meant to limit the present disclosure. Furthermore, the same reference numerals in different drawings are intended to represent the same components throughout the various drawings.

[0028] Figure 1 Fig. 1 shows a structural schematic diagram of a vehicle air conditioning system provided by an embodiment of the present application.

[0029] Figure 2 Fig. 2 shows a flowchart of a control method of the vehicle air conditioning system provided by an embodiment of the present application.

[0030] Figure 3 Fig. 3 shows an example diagram of the control method of the vehicle air conditioning system provided by the first embodiment of the present application.

[0031] Figure 4 Fig. 4 shows an example diagram of the control method of the vehicle air conditioning system provided by the second embodiment of the present application.

[0032] Figure 5 Fig. 5 shows an example diagram of the control method of the vehicle air conditioning system provided by the third embodiment of the present application.

[0033] Figure 6 Fig. 6 shows an example diagram of the control method of the vehicle air conditioning system provided by the fourth embodiment of the present application. DETAILED DESCRIPTION

[0034] Unless otherwise defined, technical terms or scientific terms used in the embodiments of the present application shall have the ordinary meaning understood by one of ordinary skill in the art to which the embodiments of the present application pertain. The terms "first", "second", and similar terms used in the embodiments of the present application do not necessarily mean any order, number, or importance, but are used to avoid confusion of elements.

[0035] Unless the context requires otherwise, throughout the specification, "plurality" means "at least two." "Include," "includes," and "including" are open-ended, inclusive, and meant to be interpreted as "comprising but not limited to." In the description of the specification, the terms "one embodiment," "some embodiments," "an exemplary embodiment," "an example," "a specific example," or "some examples," and the like, are intended to mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the specification, but that it is not necessarily included in all embodiments or examples. The appearance of these terms in various places in the specification are not necessarily referring to the same embodiment or example.

[0036] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood, and so that the scope of the present disclosure can be conveyed to those skilled in the art.

[0037] In the related art, the automobile industry is rapidly developing, and most of the vehicle fuel comes from fossil fuels, which provide nearly 80% of the world's energy demand. However, the use of most fossil fuels pollutes the environment and is a non-renewable resource. In the 2020s of the 21st century, the automobile market has entered the stock era. In the face of the impact of the epidemic, seizing the development opportunity of new energy electrification is the only way for automobile companies to balance survival and development, and to realize industrial upgrading and transformation. It is urgent to develop low-carbon and energy-saving electric vehicles to replace traditional internal combustion engine vehicles.

[0038] The sales of new energy vehicles are increasing year by year, and the public field vehicles are fully electrified, which clearly defines the main position of electric vehicles in the overall development goal of the industry. However, if we want to produce high-quality pure electric vehicles that are highly recognized by the market and accepted by customers, we need to focus on solving the customer's "range anxiety", especially the pain point of serious winter range decay, and better solve the problem of winter vehicle ride comfort. It is necessary to better allocate and control heat to achieve precise heat control.

[0039] The winter range decay of pure electric vehicles mainly comes from two points: one, the available capacity of the battery pack is directly affected by low temperature; two, the heat source of the pure electric vehicle's winter heating air conditioner comes from electric energy rather than engine waste heat. It is not difficult to find that under the current situation that battery technology has not been significantly improved, highly integrated thermal management and high-efficiency energy-saving air conditioning technology are the key path to solve the above problems. Now through the energy-saving technology of heat pump air conditioning, the general heat pump technology can only be used above-10℃, and when the temperature is lower, only the positive temperature coefficient (PTC) thermistor heating can be used to meet the air conditioning heating demand, which increases the power consumption sharply, resulting in a decrease in the vehicle's range. When the temperature is below-10℃ or even lower, in order to achieve vehicle ride comfort, PTC heating needs to be used all the time to meet the air conditioning heating demand, which greatly reduces the winter range.

[0040] Therefore, in order to solve the technical problem of insufficient winter range in the prior art, the present application provides a vehicle air conditioning system, as shown in Figure 1 Figure 1 ​is a structural schematic diagram of a vehicle air conditioning system provided by an embodiment of the present application, the vehicle air conditioning system comprising: a heating module, the heating module comprising a motor and a two-stage compressor, the two-stage compressor comprising a first-stage compressor.

[0041] The vehicle air conditioning system further comprises a controller, the controller being configured to: based on current temperature information, control the heating module to heat a battery of the vehicle in a first working mode; the current temperature information comprising: a current ambient temperature, a current battery temperature, and a current outlet temperature of the first compressor; the first working mode comprising at least one of: a motor locked-rotor heating mode, a single-stage compression heating mode, and a two-stage compression heating mode; when a current state satisfies a passenger compartment heating condition, control the heating module to heat a passenger compartment of the vehicle in a second working mode, the second working mode comprising: the two-stage compression heating mode, or a combination of the two-stage compression heating mode and the motor locked-rotor heating mode; the current state comprising at least one of: an air conditioning state and the current temperature information.

[0042] According to the current ambient temperature, the current battery temperature, and the current outlet temperature of the first compressor, an embodiment of the present application adjusts one of the motor locked-rotor heating mode, the single-stage compression heating mode, and the two-stage compression heating mode to heat the battery and / or the passenger compartment, thereby achieving vehicle heat control, vehicle ride comfort, reduced vehicle energy consumption, and increased winter range.

[0043] In an embodiment of the present application, the heating module further comprises: a heat pump heat exchanger, a second-stage compressor, a water-cooled condenser, a Chiller heat exchanger, a warm air core, and a blower. The components in the heating module are connected through at least one valve body. For details, see Figure 1The outlet end of the first-stage compressor A is connected with the first end of the first electromagnetic valve 11, and the inlet end of the first-stage compressor A is connected with the Chiller heat exchanger through a gas-liquid separator; the second end of the first electromagnetic valve 11 is connected with the water-cooled condenser and the second-stage compressor B through a first three-way valve 12, the first end of the second electromagnetic valve 13 is connected with the third end of the first electromagnetic valve 11, the second end of the second electromagnetic valve 13 is connected with the second-stage compressor B and the heat pump heat exchanger through a second three-way valve 14, the third end of the second electromagnetic valve 13 is connected with the heat pump heat exchanger, the heat pump heat exchanger is connected with the second end of the third electromagnetic valve 16 and a fourth three-way valve 17 through a third three-way valve 15, the fourth three-way valve 17 is also connected with the water-cooled condenser and the second end of the fourth electromagnetic valve 18, the water-cooled condenser is also connected with the first end of the fourth electromagnetic valve 18, the third end of the fourth electromagnetic valve 18 is connected with the warm air core through a warm air pump, the air blower is arranged on one side of the warm air core, and the warm air core is also connected with the first end of the third electromagnetic valve 16; the water-cooled condenser is also connected with the Chiller heat exchanger through an electronic expansion valve, the Chiller heat exchanger is connected with the first end of the four-way electromagnetic valve, and the Chiller heat exchanger is connected with a motor water pump and a battery water pump through a fifth three-way valve 19, the motor water pump is connected with the motor, the battery water pump is connected with the battery, the second end of the four-way electromagnetic valve is connected with the heat pump heat exchanger, the third end of the four-way electromagnetic valve is connected with the motor and the battery through a sixth three-way valve 20, and the fourth end of the four-way electromagnetic valve is connected with the third end of the third electromagnetic valve 16.

[0044] The controller controls the opening and closing of each valve body to realize the communication and shutoff between different components, thereby controlling the formation of different branches to realize the heating of the battery and / or the passenger compartment. Generally, the controller preferentially heats the battery according to the current environment temperature, the current battery temperature and the current outlet temperature, and then controls the heating of the passenger compartment after the battery temperature is heated to the second battery temperature. If the user manually increases the passenger compartment temperature or manually turns on the air conditioner, the controller preferentially controls the heating of the passenger compartment. For a more specific control process, refer to the method embodiment below.

[0045] The embodiment of the present application also provides a control method of a vehicle air conditioning system, as shown in Figure 2 Figure 2 is a flow diagram of a control method of a vehicle air conditioning system provided by the embodiment of the present application, and the control method of the vehicle air conditioning system comprises the following steps. ​Step S11: based on current temperature information, control the heating module to heat the battery of the vehicle in a first working mode; the current temperature information includes: current ambient temperature, current battery temperature and current outlet temperature of the first compressor; the first working mode includes at least one of the motor locked-rotor heating mode, the single-stage compression heating mode and the two-stage compression heating mode.

[0046] Among them, the current ambient temperature can be monitored in real time by a temperature sensor arranged on the vehicle and in contact with the outside of the vehicle, the current battery temperature can be monitored in real time by a temperature sensor arranged near the battery, and the current outlet temperature of the first compressor can be monitored in real time by a temperature sensor arranged near the outlet of the first compressor in the two-stage compressor.

[0047] In the embodiments of the present application, the single-stage compression heating mode and the two-stage compression heating mode are different heating modes of the two-stage compressor. If the current ambient temperature T1 is extremely low, for example, the current ambient temperature T1 is less than or equal to -30℃, at this time the battery cannot work, and needs to be heated in the motor locked-rotor heating mode, after the battery is heated to a first battery temperature threshold, it is controlled to continue heating the battery in the two-stage compression heating mode in combination with the current outlet temperature; when the first current outlet temperature is greater than or equal to a first outlet temperature threshold, the motor locked-rotor heating mode is closed, and the battery is heated only in the two-stage compression heating mode.

[0048] If the current ambient temperature T1 is low, for example, -30℃ < T1 ≤ 10℃, the battery is limited in discharging under this temperature condition, and the battery is directly preferentially heated in the two-stage compression heating mode.

[0049] If the current ambient temperature T1 is in the general low temperature range in winter, for example, T1 > 10℃, the battery can be heated only in the single-stage compression heating mode.

[0050] Step S12: when the current state satisfies the passenger compartment heating condition, control the heating module to heat the passenger compartment of the vehicle in a second working mode, the second working mode includes the two-stage compression heating mode, or a combination of the two-stage compression heating mode and the motor locked-rotor heating mode; the current state includes at least one of the air conditioning state and the current temperature information.

[0051] Among them, the passenger compartment heating condition can be that the air conditioning state is that the user adjusts the passenger compartment temperature to be high, or the air conditioning is turned on by the user; or it can also be that when the current ambient temperature is low, the battery is heated to satisfy certain conditions, for example, the current outlet temperature is greater than or equal to the first outlet temperature threshold, and the battery is heated to a second battery temperature threshold.

[0052] When the current ambient temperature T1 is very low, for example, T1≤-10℃, the battery discharge is severely limited, and the battery needs to be heated first to improve the battery discharge capacity, and then the passenger compartment is heated in the dual-stage compression heating mode, and the battery continues to be in the heating state.

[0053] If the current ambient temperature T1 is slightly increased, for example, -10℃

[0054] In the embodiment of the present application, if the current ambient temperature T1 is extremely low, for example, the current ambient temperature T1 is less than or equal to -30℃, the battery cannot work at this time, and needs to be heated in the motor locked-rotor heating mode. After the battery is heated to the first battery temperature threshold, the battery continues to be heated in the dual-stage compression heating mode in combination with the current outlet temperature. When the current outlet temperature is greater than or equal to the second outlet temperature threshold, the motor locked-rotor heating mode is closed, and only the battery is heated in the dual-stage compression heating mode. When the battery is heated to the second battery temperature threshold and the battery can normally discharge, the passenger compartment is heated.

[0055] If the current ambient temperature T1 is very low, for example, -30℃

[0056] If the current ambient temperature T1 is low, for example, -10℃

[0057] If the user manually increases the passenger compartment temperature or manually starts the air conditioner, the passenger compartment heating is given priority. At this time, the battery and the passenger compartment are heated in the motor locked-rotor heating mode and the dual-stage compression heating mode at the same time until the air conditioner outlet temperature of the passenger compartment reaches the target temperature, and then the motor locked-rotor heating mode is closed, and only the battery and the passenger compartment are heated and kept warm in the dual-stage compression heating mode. The target temperature is the temperature that the user sets for the passenger compartment to reach.

[0058] The control method of the vehicle air conditioning system provided in the application controls the heating module to heat the battery of the vehicle in a first working mode based on current temperature information, wherein the current temperature information includes a current ambient temperature, a current battery temperature and a current outlet temperature of the first compressor; the first working mode includes at least one of a motor locked-rotor heating mode, a single-stage compression heating mode and a two-stage compression heating mode; when a current state satisfies a passenger compartment heating condition, the heating module is controlled to heat the passenger compartment of the vehicle in a second working mode, wherein the second working mode includes the two-stage compression heating mode or a combination of the two-stage compression heating mode and the motor locked-rotor heating mode; the current state includes at least one of an air conditioning state and the current temperature information; and one of the motor locked-rotor heating mode, the single-stage compression heating mode and the two-stage compression heating mode is adjusted to heat the battery and / or the passenger compartment according to the current ambient temperature, the current battery temperature and the current outlet temperature of the first compressor, so as to realize vehicle heat control, improve vehicle driving comfort, reduce vehicle energy consumption and increase winter driving range.

[0059] To make the technical solutions provided by the embodiments of the application clearer, a multimedia playing method based on multiple keywords provided by the application is further described below.

[0060] It is considered that the demand for heat will be different when the vehicle is in different ambient temperature conditions. Based on this, in the embodiments of the application, if the current ambient temperature is less than or equal to a first ambient temperature threshold, the heating module is controlled to heat the battery of the vehicle in the motor locked-rotor heating mode and the two-stage compression heating mode according to the current battery temperature and the current outlet temperature; if the current ambient temperature is greater than the first ambient temperature threshold and less than or equal to a third ambient temperature threshold, the heating module is controlled to heat the battery of the vehicle in the two-stage compression heating mode according to the current battery temperature and the current outlet temperature; and if the current ambient temperature is greater than the third ambient temperature threshold, the heating module is controlled to heat the battery of the vehicle in the single-stage compression heating mode by starting the first-stage compressor to heat the battery.

[0061] When the current ambient temperature is less than or equal to the first ambient temperature threshold, the battery cannot work, and the battery of the vehicle needs to be heated in combination with the motor locked-rotor heating mode and the two-stage compression heating mode. When the current ambient temperature is greater than the first ambient temperature threshold and less than or equal to the third ambient temperature threshold, the battery discharge is limited, and the battery needs to be heated first to improve the battery discharge capacity. Specifically, the heating module can only be controlled to heat the battery of the vehicle in the two-stage compression heating mode according to the current battery temperature and the current outlet temperature. When the current ambient temperature is greater than the third ambient temperature threshold, the battery is not limited much, and only the temperature of the battery needs to be increased slightly. Therefore, the first-stage compressor can be directly started to heat the battery of the vehicle in the single-stage compression heating mode to reduce the energy consumption of the whole vehicle.

[0062] Since the energy consumption is large in the motor locked-rotor heating mode, the battery of the vehicle is heated in the motor locked-rotor heating mode and the two-stage compression heating mode only when the current ambient temperature is less than or equal to the first ambient temperature threshold, so as to realize the adjustment of the heat priority and reduce the energy consumption of the whole vehicle. When the current ambient temperature is greater than the first ambient temperature threshold and less than or equal to the third ambient temperature threshold, the battery of the vehicle is heated in the two-stage compression heating mode. When the current ambient temperature is greater than the third ambient temperature threshold, the first-stage compressor is started to heat the battery of the vehicle, so as to realize the heat control of the vehicle and reduce the energy consumption of the whole vehicle and increase the winter endurance.

[0063] When the current ambient temperature T1 is extremely low, for example, T1≤-30℃, the battery cannot work. Based on this, the heating module further includes a heat pump heat exchanger, a water-cooled condenser and a Chiller heat exchanger. The two-stage compressor further includes a second-stage compressor. In the embodiments of the present application, if the current ambient temperature is less than or equal to the first ambient temperature threshold, the battery heating and the heat storage of the heat pump heat exchanger are controlled in the motor locked-rotor heating mode. If the battery heating is greater than or equal to the first battery temperature threshold, the heat pump heating of the two-stage compressor is started, the first-stage compressor is controlled to compress the refrigerant, the refrigerant flows through the heat pump heat exchanger and enters the second-stage compressor, and the heat pump heat exchanger absorbs the heat of the refrigerant. The two-stage compressor is controlled to heat according to the current outlet temperature, until the current outlet temperature is greater than or equal to the first outlet temperature threshold. If the current outlet temperature is greater than or equal to the second outlet temperature threshold, the motor locked-rotor heating mode is closed. If the current outlet temperature is greater than or equal to the first outlet temperature threshold, the first-stage compressor is controlled to compress the refrigerant, and the refrigerant flows through the water-cooled condenser and the Chiller heat exchanger for heat storage, so as to heat the battery, until the battery heating is greater than or equal to the second battery temperature threshold. The first ambient temperature threshold can be set as required, and is preferably -30℃.

[0064] In this embodiment, if the current ambient temperature is less than or equal to a first ambient temperature threshold, the battery cannot discharge due to the low ambient temperature. Since the dual-stage compression heating mode requires a necessary power supply from the battery to operate, it cannot be applied in this situation. Therefore, only the motor stall heating mode can be used, where the motor water pump starts with a water flow rate N1, and the four-way solenoid valve is opened to heat the battery and store heat in the heat pump heat exchanger. The water flow rate N1 can be set as needed. At this time, based on... Figure 1 The vehicle air conditioning system shown controls the conduction of the fifth three-way valve 19 and the sixth three-way valve 20. The motor, the sixth three-way valve 20, the battery, the battery water pump, the fifth three-way valve 19, and the motor water pump form a control loop, allowing the heat from the stalled motor to circulate within the high-voltage battery to heat it. Simultaneously, it controls the connection of the first and fourth terminals of the four-way solenoid valve, and the connection of the second and third terminals of the four-way solenoid valve. It also controls the conduction of the third three-way valve 15 and the fourth three-way valve 17, the connection of the first and third terminals of the third solenoid valve 16, and the connection of the second and third terminals of the fourth solenoid valve 18. The motor, the sixth three-way valve 20, the four-way solenoid valve, the heat pump heat exchanger, the third three-way valve 15, the fourth three-way valve 17, the fourth solenoid valve 18, the heater water pump, the heater core, the third solenoid valve 16, the four-way solenoid valve, the Chiller heat exchanger, the fifth three-way valve 19, and the motor water pump form a control loop, allowing the motor heat to flow through the heat pump heat exchanger. At this point, the heat pump heat exchanger only stores heat, allowing the heat from the motor to increase the heat storage for the two-stage compressor. Heat is dissipated through the Chiller heat exchanger, exchanging heat with the battery to heat it.

[0065] When the battery is heated to the current battery temperature T2 greater than or equal to the first battery temperature threshold, the battery can be discharged and provide the necessary power to the two-stage compressor through the motor blocked heat mode. The first battery temperature threshold can be set as needed, preferably -20℃. At this time, the two-stage compressor heating mode can be applied, and the heat pump heating of the two-stage compressor is controlled to be turned on, and the first stage compressor compresses the refrigerant and then flows into the second stage compressor through the heat pump heat exchanger. At this time, the first stage compressor A, the first electromagnetic valve 11, the second electromagnetic valve 13, the heat pump heat exchanger, the second three-way valve 14, the second stage compressor B, the first three-way valve 12, the water-cooled condenser, the electronic expansion valve, the Chiller heat exchanger, and the gas-liquid separator are sequentially connected to form a control loop. The first stage compressor A and the second stage compressor B heat, the Chiller heat exchanger dissipates heat, exchanges heat with the battery, and heats the battery. When the refrigerant flows through the heat pump heat exchanger, the refrigerant absorbs the heat of the heat pump heat exchanger, so that the two-stage compressor quickly establishes a high-temperature and high-pressure cycle, that is, the two-stage compressor can compress the refrigerant to a higher pressure and a higher temperature, and can generate more heat. At this time, the current outlet temperature T3 of the first stage compressor is continuously rising.

[0066] During the process of continuously increasing the current outlet temperature T3, the two-stage compressor heat generation mode can be controlled according to the current outlet temperature until the current outlet temperature is greater than or equal to the first outlet temperature threshold. The first outlet temperature threshold can be set as needed, and is preferably 60℃. If sufficient heat can be provided by the two-stage compressor heat generation to rapidly heat the battery during this process, the motor locked-rotor heat generation mode can be turned off. When the current outlet temperature is greater than or equal to the first outlet temperature threshold, the two-stage compressor heat generation is effective. At this time, the first-stage compressor compressed refrigerant can flow through only the heat storage water-cooled condenser and the Chiller heat exchanger to heat the battery until the current battery temperature is greater than or equal to the second battery temperature threshold. At this time, the first-stage compressor A, the first electromagnetic valve 11, the second electromagnetic valve 13, the second three-way valve 14, the second-stage compressor B, the first three-way valve 12, the water-cooled condenser, the electronic expansion valve, the Chiller heat exchanger, and the gas-liquid separator are sequentially connected to form a control loop, wherein the water-cooled condenser only stores heat and does not exchange heat with the passenger compartment. When the current battery temperature is greater than or equal to the second battery temperature threshold, it indicates that the battery can provide sufficient power for the vehicle, and the battery does not need to continue to heat up, but only needs to be kept warm to ensure that the discharge capacity of the battery does not decrease. The motor locked-rotor heat generation mode is used first to heat the battery to enable the battery to discharge when the current ambient temperature is less than or equal to the first ambient temperature threshold in the embodiment of the application, and then the two-stage compressor heat generation mode is used to generate heat until the current battery temperature is greater than or equal to the second battery temperature threshold, which can reduce the energy consumption of the vehicle and increase the winter range; the motor locked-rotor heat generation mode is turned off when the two-stage compressor can generate sufficient heat, that is, the two-stage compressor heat generation mode is preferably used, and the motor locked-rotor heat generation mode is used only when necessary, so that the heat priority is adjusted to achieve vehicle heat control.

[0067] In order to better realize the dual-stage compression heating, the heat pump heat exchanger needs to be applied to store heat first to establish a high-temperature and high-pressure cycle of the dual-stage compressor. Based on this, if the current outlet temperature is less than a second outlet temperature threshold, the heat pump heating of the dual-stage compressor is controlled to be turned on, and the compressed refrigerant of the first-stage compressor flows through the heat pump heat exchanger into the second-stage compressor, and the refrigerant absorbs the heat of the heat pump heat exchanger; if the current outlet temperature is greater than or equal to the second outlet temperature threshold and less than the first outlet temperature threshold, the motor locked-rotor heating mode is turned off, the compressed refrigerant of the first-stage compressor directly enters the second-stage compressor, and the compressed refrigerant of the dual-stage compressor flows through the water-cooled condenser and the Chiller heat exchanger for heat storage only, so as to heat the battery. The second outlet temperature threshold can be set as needed, and is preferably 30°C. By storing heat of the heat pump heat exchanger first in the dual-stage compressor heating process, a high-temperature and high-pressure cycle of the dual-stage compressor is established, and the dual-stage compressor under the high-temperature and high-pressure cycle can achieve better heating effect, so that the vehicle heat control can be realized, and the energy consumption of the vehicle can be reduced.

[0068] In the embodiment of the application, the current outlet temperature is less than the second outlet temperature threshold, at this time, the motor locked-rotor heating mode is in an open state, the heat pump heat exchanger continues to absorb the heat generated by the motor, continues to store heat, and the heating effect of the dual-stage compression heating mode can still be improved. At this time, the heat pump heating of the dual-stage compressor can be controlled to be turned on, and the compressed refrigerant of the first-stage compressor flows through the heat pump heat exchanger into the second-stage compressor, that is, the first-stage compressor A, the first electromagnetic valve 11, the second electromagnetic valve 13, the heat pump heat exchanger, the second three-way valve 14, the second-stage compressor B, the first three-way valve 12, the water-cooled condenser, the electronic expansion valve, the Chiller heat exchanger and the gas-liquid separator are sequentially connected to form a control loop, and the refrigerant absorbs the heat of the heat pump heat exchanger when flowing through the heat pump heat exchanger, which helps to establish a high-temperature and high-pressure cycle of the dual-stage compressor, so as to improve the heating effect of the dual-stage compressor, and the current outlet temperature continues to rise.

[0069] When the current outlet temperature is greater than or equal to the second outlet temperature threshold and less than the first outlet temperature threshold, at this time, only the two-stage compression heating can provide all the heat required for battery heating, so the motor stall heating mode can be closed. Due to the closing of the motor stall heating mode, the heat pump heat exchanger cannot absorb heat from the environment. At this time, the compressed refrigerant of the first-stage compressor can be directly controlled to enter the second-stage compressor, and the compressed refrigerant of the two-stage compressor can be controlled to flow through the water-cooled condenser for heat storage only and the Chiller heat exchanger to heat the battery. At this time, the first-stage compressor A, the first electromagnetic valve 11, the second electromagnetic valve 13, the second three-way valve 14, the second-stage compressor B, the first three-way valve 12, the water-cooled condenser, the electronic expansion valve, the Chiller heat exchanger, and the gas-liquid separator are sequentially and circularly connected to form a control loop, wherein the water-cooled condenser is only for heat storage, and does not exchange heat with the passenger compartment. The heat storage of the water-cooled condenser prepares for subsequent heating of the heater core. In this process, the current outlet temperature continues to rise until the current outlet temperature rises to be greater than or equal to the first outlet temperature threshold.

[0070] To achieve the comfort of the vehicle, when the two-stage compression heating is good, the passenger compartment can be heated under the condition that the battery discharge is normal. Based on this, optionally, the compressed refrigerant of the first-stage compressor can be controlled to flow through the water-cooled condenser and the Chiller heat exchanger, the heater water pump is controlled to be turned on, and the first-stage compressor generates heat to exchange with the heat of the heater core; if the battery heating is controlled to the current battery temperature greater than or equal to the second battery temperature threshold, the compressed refrigerant of the two-stage compressor is controlled to flow through the water-cooled condenser and the Chiller heat exchanger to heat the passenger compartment; and the heat of the first-stage compressor is controlled to heat the heater core through the heat pump heat exchanger to heat and keep warm the passenger compartment. By exchanging heat between the water-cooled condenser and the heater core, the heater core is heated, and heat exchange between the heater core and the passenger compartment is achieved through the air blower, so that the passenger compartment is rapidly heated and kept warm, and the comfort of the vehicle is achieved.

[0071] In the embodiment of the present application, the motor stall heating is closed, the current outlet temperature is greater than or equal to the first outlet temperature threshold, and the compressed refrigerant of the first-stage compressor flows through the water-cooled condenser and the Chiller heat exchanger. It can be considered to control the heater water pump to be turned on, so that the first-stage compressor generates heat to exchange with the heat of the heater core to prepare for heating the passenger compartment. At this time, the first-stage compressor A, the first electromagnetic valve 11, the second electromagnetic valve 13, the second three-way valve 14, the second-stage compressor B, the first three-way valve 12, the water-cooled condenser, the electronic expansion valve, the Chiller heat exchanger, and the gas-liquid separator are sequentially and circularly connected to form a control loop, and the water-cooled condenser, the fourth electromagnetic valve 18, the heater water pump, the heater core, the third electromagnetic valve 16, the third three-way valve 15, and the fourth three-way valve 17 are sequentially and circularly connected to form a control loop.

[0072] When the battery is heated to a current battery temperature greater than or equal to a second battery temperature threshold, the two-stage compressor compressed refrigerant flows through the water-cooled condenser and the Chiller heat exchanger, and the battery and the passenger cabin are heated. The two-stage compressor compressed refrigerant is heated, exchanges heat with the water-cooled condenser and the heater core, heats the heater core, exchanges heat with the passenger cabin to heat the passenger cabin, and exchanges heat with the battery to heat the battery. The first-stage compressor A, the first electromagnetic valve 11, the second electromagnetic valve 13, the second three-way valve 14, the second-stage compressor B, the first three-way valve 12, the water-cooled condenser, the electronic expansion valve, the Chiller heat exchanger, and the gas-liquid separator are sequentially connected to form a control loop. At the same time, the air blower is controlled to be turned on, and the first-stage compressor compressed heat is used to heat the heater core through the heat pump heat exchanger to heat and insulate the passenger cabin. The heater core and the passenger cabin exchange heat through the air blower, and the passenger cabin is quickly heated and insulated.

[0073] At this point, the process of heating and insulating the battery and the passenger cabin under the condition that the current environmental temperature is less than or equal to the first environmental temperature threshold is completed. If the environmental conditions do not change, the control state of the two-stage compressor compressed refrigerant flowing through the water-cooled condenser and the Chiller heat exchanger, and the air blower being turned on, and the first-stage compressor compressed heat being used to heat the heater core through the heat pump heat exchanger remains unchanged.

[0074] Taking the first environmental temperature threshold of -30°C, the first battery temperature threshold of -20°C, the first outlet temperature threshold of 60°C, the second outlet temperature threshold of 30°C, and the second battery temperature threshold of 20°C as an example, the vehicle air conditioning system in Figure 1 is used as an example, as shown in Figure 3 , the control method of the vehicle air conditioning system includes: Step 100: The whole vehicle is powered on.

[0075] Step 101: Monitor the current environmental temperature T1.

[0076] The current environmental temperature can be monitored in real time by a temperature sensor arranged on the vehicle and in contact with the outside of the vehicle.

[0077] Step 102: Determine whether T1≤-30°C. If yes, execute step 103.

[0078] When the environmental temperature T1≤-30°C, it means that the current environmental temperature T1 is extremely low, and the battery cannot work at this time.

[0079] Step 103: Control the motor to be blocked to heat, and the motor water pump to start the water flow N1.

[0080] Control the heating in the motor locked-rotor heat mode, the motor water pump starts the water flow N1 to heat the battery.

[0081] Step 104: Control the valve body to open, the motor locked-rotor heat circulates in the high-pressure battery, and the motor heat can flow through the heat pump heat exchanger to realize the motor heat to increase the heat storage of the two-stage compressor.

[0082] By controlling the opening and closing of the related valve body, the motor, the sixth three-way valve 20, the battery, the battery water pump, the fifth three-way valve 19, and the motor water pump form a control loop, so that the motor locked-rotor heat circulates in the high-pressure battery to heat the battery. At the same time, the motor, the sixth three-way valve 20, the four-way electromagnetic valve, the heat pump heat exchanger, the third three-way valve 15, the fourth three-way valve 17, the fourth electromagnetic valve 18, the heater water pump, the heater core, the third electromagnetic valve 16, the four-way electromagnetic valve, the Chiller heat exchanger, the fifth three-way valve 19, and the motor water pump are sequentially connected to form a control loop, so that the motor heat can flow through the heat pump heat exchanger. At this time, the heat pump heat exchanger only stores heat to realize the increase of the heat storage of the two-stage compressor by the motor heat. At the same time, heat is dissipated through the Chiller heat exchanger, and heat is exchanged with the battery to heat the battery.

[0083] Step 105: Monitor the current battery temperature T2.

[0084] The current battery temperature can be monitored in real time by a temperature sensor arranged near the battery Step 106: Determine whether T2≥-20℃. If yes, execute step 107. Otherwise, return to step 104.

[0085] When the current battery temperature T2≥-20℃, the battery can discharge to provide the necessary power supply to the two-stage compressor. Otherwise, the battery discharge is very limited.

[0086] Step 107: Control the two-stage compressor heat pump heating to start, the first-stage compressor compresses the refrigerant to flow through the heat pump heat exchanger into the second-stage compressor, and the refrigerant absorbs the heat of the heat pump heat exchanger to quickly establish a high-temperature and high-pressure circulation.

[0087] When the current battery temperature T2≥-20℃, the two-stage compressor heat pump heating is controlled to be turned on. The refrigerant compressed by the first-stage compressor flows through the heat pump heat exchanger into the second-stage compressor. The refrigerant absorbs heat from the heat pump heat exchanger, and the two-stage compressor quickly establishes a high-temperature and high-pressure cycle. At this time, the related valve bodies are controlled to be opened and closed, so that the first-stage compressor A, the first electromagnetic valve 11, the second electromagnetic valve 13, the heat pump heat exchanger, the second three-way valve 14, the second-stage compressor B, the first three-way valve 12, the water-cooled condenser, the electronic expansion valve, the Chiller heat exchanger, and the gas-liquid separator are sequentially and circularly connected to form a control loop. The Chiller heat exchanger dissipates heat and exchanges heat with the battery, thereby heating the battery. When the refrigerant flows through the heat pump heat exchanger, the refrigerant absorbs heat from the heat pump heat exchanger, so that the two-stage compressor quickly establishes a high-temperature and high-pressure cycle, that is, the two-stage compressor can compress the refrigerant to a higher pressure and a higher temperature, thereby generating more heat. At this time, the current outlet temperature T3 of the first-stage compressor continuously increases.

[0088] Step 108: Monitor the current outlet temperature T3.

[0089] The current outlet temperature T3 is monitored in real time by a temperature sensor arranged near the outlet of the first compressor in the two-stage compressor.

[0090] Step 109: Determine whether T3≥60℃. If yes, step 110 is performed. Otherwise, step 114 is skipped.

[0091] When the current outlet temperature T3≥60℃, it indicates that the two-stage compressor heating effect is good.

[0092] Step 110: Control the refrigerant compressed by the two-stage compressor to flow through the water-cooled condenser (only heat storage) and the Chiller heat exchanger to heat the battery.

[0093] When the current outlet temperature T3≥60℃, the refrigerant compressed by the two-stage compressor is controlled to flow through the water-cooled condenser (only heat storage) and the Chiller heat exchanger to heat the battery, until the battery is heated to the current battery temperature T2≥20℃. At this time, the related valve bodies are controlled to be opened and closed, so that the first-stage compressor A, the first electromagnetic valve 11, the second electromagnetic valve 13, the second three-way valve 14, the second-stage compressor B, the first three-way valve 12, the water-cooled condenser, the electronic expansion valve, the Chiller heat exchanger, and the gas-liquid separator are sequentially and circularly connected to form a control loop. The Chiller heat exchanger exchanges heat with the battery to heat the battery, and the water-cooled condenser only stores heat and does not exchange heat with the passenger compartment.

[0094] Step 111: Control the warm air water pump to be turned on, the first-stage compressor generates heat to exchange heat with the warm air core, the blower is in a closed state, and the warm air core stores heat.

[0095] After the motor locked-rotor heating mode is turned off, the heating water pump is turned on, the first-stage compressor exchanges heat with the heating core, and the blower is turned off. The heating core is heated, and the first-stage compressor exchanges heat with the heating core. At this time, the relevant valve bodies are controlled to be opened and closed, so that the water-cooled condenser, the fourth solenoid valve 18, the heating water pump, the heating core, the third solenoid valve 16, the four-way solenoid valve, the heat pump heat exchanger, the third three-way valve 15, and the fourth three-way valve 17 are sequentially and circularly connected to form a control loop. The heating core is heated to prepare for heating the passenger compartment.

[0096] Step 112: Determine whether T2≥20℃. If yes, execute step 113. Otherwise, return to step 111.

[0097] When the current battery temperature is greater than or equal to the second battery temperature threshold, it indicates that the battery can already provide sufficient power for the vehicle, and the subsequent battery does not need to continue to heat up, but only needs to be kept warm to ensure that the discharge capacity of the battery does not decrease.

[0098] Step 113: The two-stage compressor compresses the refrigerant, which flows through the water-cooled condenser and the Chiller heat exchanger, while heating the battery and the cabin. At this time, the blower is turned on, the first-stage compressor compresses the heat to heat the heating core through the heat pump heat exchanger, and the passenger compartment is rapidly heated and kept warm.

[0099] At this time, the relevant valve bodies are controlled to be opened and closed, so that the first-stage compressor A, the first solenoid valve 11, the second solenoid valve 13, the second three-way valve 14, the second-stage compressor B, the first three-way valve 12, the water-cooled condenser, the electronic expansion valve, the Chiller heat exchanger, and the gas-liquid separator are sequentially and circularly connected to form a control loop. At the same time, the water-cooled condenser, the fourth solenoid valve 18, the heating water pump, the heating core, the third solenoid valve 16, the four-way solenoid valve, the heat pump heat exchanger, the third three-way valve 15, and the fourth three-way valve 17 are sequentially and circularly connected to form a control loop, and the battery is heated through the Chiller heat exchanger. At the same time, the heat pump heat exchanger and the heating core form a control loop to heat the heating core, and the blower is turned on to exchange heat between the heating core and the passenger compartment, achieving rapid heating and keeping warm of the passenger compartment.

[0100] Step 114: Determine whether 30℃≤T3<60℃. If yes, execute step 115.

[0101] When 30℃≤T3<60℃, only the two-stage compression heating mode can provide all the heat required for battery heating.

[0102] Step 115: Control the motor locked-rotor heating mode to be turned off, and the first-stage compressor directly enters the second-stage compressor after compressing the refrigerant. The two-stage compressor compresses the refrigerant, which flows through the water-cooled condenser (only for heat storage) and the Chiller heat exchanger to heat the battery. Then return to step 108.

[0103] At this time, the control related valve body is opened and closed, so that the first stage compressor A, the first electromagnetic valve 11, the second electromagnetic valve 13, the second three-way valve 14, the second stage compressor B, the first three-way valve 12, the water-cooled condenser, the electronic expansion valve, the Chiller heat exchanger and the gas-liquid separator are sequentially connected to form a control loop. Heat is dissipated through the Chiller heat exchanger. Heat is exchanged with the battery to heat the battery. The water-cooled condenser only stores heat and does not exchange heat with the passenger cabin.

[0104] Step 116: Determine whether T3 < 30℃. If yes, return to step 107.

[0105] When T3 < 30℃, it means that the heat pump heat exchanger can continue to store heat, and the two-stage compression heating has not yet reached the best heating effect. At this time, return to step 107 to control the first stage compressor to compress the refrigerant and then flow through the heat pump heat exchanger into the second stage compressor. The refrigerant flowing through the heat pump heat exchanger absorbs the heat of the heat pump heat exchanger, which helps the two-stage compressor to establish a high-temperature and high-pressure cycle to improve the heating effect of the two-stage compressor, and the current outlet temperature continues to rise.

[0106] At this point, the process of heating and insulating the battery and the passenger cabin under the environmental condition of the current ambient temperature T1 ≤ -30℃ is completed. If the environmental condition does not change, the control state of the two-stage compressor, the water-cooled condenser and the Chiller heat exchanger through which the compressed refrigerant flows, and the blower remain unchanged.

[0107] If the current environment temperature T1 is very low, the battery is severely limited in discharging at this temperature, and the battery needs to be heated first to improve the battery discharging capacity. Based on this, the heating module also includes a heat pump heat exchanger, a water-cooled condenser and a Chiller heat exchanger. The dual-stage compressor also includes a second-stage compressor. Optionally, if the current environment temperature is greater than the first environment temperature threshold and less than or equal to the second environment temperature threshold, the heat pump heating of the dual-stage compressor is controlled to be turned on, the first-stage compressor is controlled to compress the refrigerant and then directly enter the second-stage compressor, and the dual-stage compressor is controlled to compress the refrigerant to flow through only the water-cooled condenser and the Chiller heat exchanger for heat storage, so as to heat the battery; if the battery is heated to the battery temperature greater than or equal to the first battery temperature threshold and the current outlet temperature is greater than or equal to the first outlet temperature threshold, the first-stage compressor is controlled to compress the refrigerant and then flow through only the water-cooled condenser and the Chiller heat exchanger for heat storage, so as to heat the battery, until the battery is heated to the current battery temperature greater than or equal to the second battery temperature threshold. The second environment temperature threshold can be set as needed, and is preferably -30℃. In the current environment temperature greater than the first environment temperature threshold and less than or equal to the second environment temperature threshold, the embodiment of the application directly applies the dual-stage compressor heating to heat the battery to improve the battery discharging capacity, until the battery is heated to the current battery temperature greater than or equal to the second battery temperature threshold, so as to realize the vehicle heat control, reduce the vehicle energy consumption and increase the winter range.

[0108] If the current environment temperature T1 is very low, for example, -30℃ < T1 ≤ -10℃, the battery is severely limited in discharging at this temperature, and the battery needs to be heated first to improve the battery discharging capacity. The heat pump heating of the dual-stage compressor can be controlled to be turned on. Since the heat pump heat exchanger cannot absorb heat from the environment under the current environment temperature condition, the first-stage compressor can be controlled to compress the refrigerant and then directly enter the second-stage compressor, and the dual-stage compressor can be controlled to compress the refrigerant to flow through only the water-cooled condenser and the Chiller heat exchanger for heat storage. At this time, the first-stage compressor A, the first electromagnetic valve 11, the second electromagnetic valve 13, the second three-way valve 14, the second-stage compressor B, the first three-way valve 12, the water-cooled condenser, the electronic expansion valve, the Chiller heat exchanger and the gas-liquid separator are sequentially and circularly connected to form a control loop, wherein the water-cooled condenser only stores heat and does not exchange heat with the passenger compartment, the current outlet temperature is increased, which can help to establish a high-temperature and high-pressure circulation of the dual-stage compressor, thereby helping to improve the heating effect of the dual-stage compressor. The Chiller heat exchanger can exchange heat with the battery to heat the battery.

[0109] The battery is heated to a current battery temperature greater than or equal to a first battery temperature threshold value, and the current outlet temperature is greater than or equal to a first outlet temperature threshold value, indicating that the two-stage compressor heating effect is good at this time, but the battery discharge capacity can be further improved. At this time, the compressed refrigerant of the first-stage compressor can flow through only the water-cooled condenser and the Chiller heat exchanger for heat storage until the battery is heated to a current battery temperature greater than or equal to a second battery temperature threshold value. At this time, the water-cooled condenser only performs heat storage and does not exchange heat with the passenger compartment. When the current battery temperature is greater than or equal to the second battery temperature threshold value, the battery can provide sufficient power for the vehicle, and the subsequent battery does not need to continue to heat, but only needs to be kept warm to ensure that the battery discharge capacity does not decrease.

[0110] Under this ambient temperature condition, in order to realize the vehicle driving comfort, the passenger compartment can be heated under the condition that the two-stage compression heating effect is good and the battery discharge is normal. The heating of the passenger compartment can be prepared by first controlling the water pump to be turned on and the heat exchange between the heat generated by the first-stage compressor and the heat of the heater core.

[0111] When the battery is heated to a current battery temperature greater than or equal to a second battery temperature threshold value, the compressed refrigerant of the two-stage compressor is controlled to flow through the water-cooled condenser and the Chiller heat exchanger, and the battery and the passenger compartment are heated at the same time. The heat exchange between the water-cooled condenser and the passenger compartment realizes the heating of the passenger compartment, and the heat exchange between the Chiller heat exchanger and the battery realizes the heating of the battery. The water-cooled condenser, the fourth electromagnetic valve 18, the water pump, the heater core, the third electromagnetic valve 16, the four-way electromagnetic valve, the heat pump heat exchanger, the third three-way valve 15, and the fourth three-way valve 17 are sequentially and circularly connected to form a control loop. At the same time, the air blower is controlled to be turned on, and the heat generated by the first-stage compressor is controlled to heat the heater core through the heat pump heat exchanger to heat and keep warm the passenger compartment. The heat exchange between the heater core and the passenger compartment is realized through the air blower, and then the passenger compartment is rapidly heated and kept warm.

[0112] At this time, the heating and keeping warm process of the battery and the passenger compartment under the condition that the current ambient temperature is greater than the first ambient temperature threshold value and less than or equal to the second ambient temperature threshold value is completed. If the ambient condition does not change, the control state of the compressed refrigerant of the two-stage compressor flowing through the water-cooled condenser and the Chiller heat exchanger, the air blower being turned on, and the heat generated by the first-stage compressor heating the heater core through the heat pump heat exchanger remains unchanged.

[0113] The following takes the first ambient temperature threshold value as -30℃, the second ambient temperature threshold value as -10℃, the first battery temperature threshold value as -20℃, the first outlet temperature threshold value as 60℃, and the second battery temperature threshold value as 20℃ as an example, and the vehicle air conditioning system in the vehicle air conditioning system is combined Figure 1 The ambient temperature T1 is in the condition of -30℃<T1≤-10℃, as shown inFigure 4 The control method of the vehicle air conditioning system comprises the following steps: Step 200: The whole vehicle is powered on.

[0114] Step 201: The current ambient temperature T1 is monitored.

[0115] Step 202: The current ambient temperature T1 satisfies -30℃ < T1≤ -10℃.

[0116] When the current ambient temperature T1 satisfies -30℃ < T1≤ -10℃, the current ambient temperature T1 is very low, and the discharge of the battery is severely limited at this temperature. Therefore, the battery needs to be heated first to improve the discharge capacity of the battery.

[0117] Step 203: The two-stage compressor heat pump heating is controlled to be turned on. The first-stage compressor compresses the refrigerant and directly enters the second-stage compressor. The refrigerant after being compressed by the two-stage compressor flows through the water-cooled condenser (only heat storage) and the Chiller heat exchanger to heat the battery.

[0118] When the ambient temperature T1 satisfies -30℃ < T1≤ -10℃, the related valve bodies are controlled to be opened and closed, so that the first-stage compressor A, the first electromagnetic valve 11, the second electromagnetic valve 13, the second three-way valve 14, the second-stage compressor B, the first three-way valve 12, the water-cooled condenser, the electronic expansion valve, the Chiller heat exchanger, and the gas-liquid separator are sequentially and circularly connected to form a control loop. The heating of the battery is realized by heat exchange through the Chiller heat exchanger. The water-cooled condenser only stores heat and does not exchange heat with the passenger compartment.

[0119] Step 204: The current outlet temperature T3 and the current battery temperature T2 are monitored.

[0120] Step 205: It is judged whether T3≥ 60℃ and T2≥ -20℃. If yes, step 206 is executed. Otherwise, step 203 is returned.

[0121] Step 206: The refrigerant after being compressed by the two-stage compressor is controlled to flow through the water-cooled condenser and the Chiller heat exchanger to heat the battery.

[0122] When the current outlet temperature T3≥ 60℃, the related valve bodies are controlled to be opened and closed, so that the first-stage compressor, the first electromagnetic valve 11, the second electromagnetic valve 13, the second three-way valve 14, the second-stage compressor B, the first three-way valve 12, the water-cooled condenser, the electronic expansion valve, the Chiller heat exchanger, and the gas-liquid separator are sequentially and circularly connected to form a control loop. The Chiller heat exchanger exchanges heat with the battery to heat the battery, and the water-cooled condenser only stores heat and does not exchange heat with the passenger compartment.

[0123] If the motor locked-rotor heating is not closed at this time, the four-way electromagnetic valve is closed, and the motor locked-rotor heating is closed.

[0124] Step 207: control the warm water pump to be turned on, the first stage compressor to generate heat and exchange heat with the warm core, the air blower to be in the closed state, and the warm core to store heat.

[0125] After the motor is closed in the locked-rotor mode, the warm water pump is controlled to be turned on, the first stage compressor generates heat and exchanges heat with the warm core, the air blower is in the closed state, the warm core stores heat, and the first stage compressor generates heat and exchanges heat with the warm core. At this time, the related valve bodies are controlled to be opened and closed, so that the water-cooled condenser, the fourth electromagnetic valve 18, the warm water pump, the warm core, the third electromagnetic valve 16, the four-way electromagnetic valve, the heat pump heat exchanger, the third three-way valve 15, and the fourth three-way valve 17 are sequentially and circularly connected to form a control loop, the warm core stores heat, and preparation is made for heating the passenger compartment.

[0126] Step 208: determine whether T2≥20℃. If yes, step 209 is performed. Otherwise, return to step 207.

[0127] When the current battery temperature is greater than or equal to the second battery temperature threshold, it is indicated that the battery can already provide sufficient power for the vehicle, and the subsequent battery does not need to continue to be warmed up, but mainly to be kept warm.

[0128] Step 209: the two-stage compressor compressed refrigerant flows through the water-cooled condenser and the Chiller heat exchanger, and simultaneously heats the battery and the cabin. At this time, the air blower is turned on, the first stage compressor compressed heat heats the warm core through the heat pump heat exchanger, and rapid heating and keeping warm of the passenger compartment are achieved.

[0129] At this time, the related valve bodies are controlled to be opened and closed, so that the first stage compressor A, the first electromagnetic valve 11, the second electromagnetic valve 13, the second three-way valve 14, the second stage compressor B, the first three-way valve 12, the water-cooled condenser, the electronic expansion valve, the Chiller heat exchanger, and the gas-liquid separator are sequentially and circularly connected to form a control loop. The battery is heated through the Chiller heat exchanger. At the same time, the heat pump heat exchanger and the warm core form a control loop, that is, the water-cooled condenser, the fourth electromagnetic valve 18, the warm water pump, the warm core, the third electromagnetic valve 16, the four-way electromagnetic valve, the heat pump heat exchanger, the third three-way valve 15, and the fourth three-way valve 17 are sequentially and circularly connected to form a control loop, the warm core is heated, and at the same time, the air blower is turned on, so that the warm core exchanges heat with the passenger compartment, rapid heating and keeping warm of the passenger compartment are achieved.

[0130] At this time, the related valve bodies are controlled to be opened and closed, so that the first stage compressor A, the first electromagnetic valve 11, the second electromagnetic valve 13, the second three-way valve 14, the second stage compressor B, the first three-way valve 12, the water-cooled condenser, the electronic expansion valve, the Chiller heat exchanger, and the gas-liquid separator are sequentially and circularly connected to form a control loop. The battery is heated through the Chiller heat exchanger. At the same time, the heat pump heat exchanger and the warm core form a control loop, that is, the water-cooled condenser, the fourth electromagnetic valve 18, the warm water pump, the warm core, the third electromagnetic valve 16, the four-way electromagnetic valve, the heat pump heat exchanger, the third three-way valve 15, and the fourth three-way valve 17 are sequentially and circularly connected to form a control loop, the warm core is heated, and at the same time, the air blower is turned on, so that the warm core exchanges heat with the passenger compartment, rapid heating and keeping warm of the passenger compartment are achieved.

[0131] In consideration of the current environment temperature T1 being low, for example, -10℃ < T1 ≤ -10℃, the battery is slightly limited in discharging at this temperature, and the battery needs little heat to discharge after being warmed up. Based on this, the heating module further comprises a heat pump heat exchanger, a water-cooled condenser, a Chiller heat exchanger and a warm air core. The two-stage compressor further comprises a second-stage compressor. Optionally, if the current environment temperature is greater than the second environment temperature threshold and less than or equal to a third environment temperature threshold, the heat pump heating of the two-stage compressor is controlled, the first-stage compressor is controlled to compress the refrigerant to flow through the heat pump heat exchanger into the second-stage compressor, and the two-stage compressor is controlled to compress the refrigerant to flow through the water-cooled condenser and the Chiller heat exchanger to heat the battery and the warm air core. The first-stage compressor A, the first electromagnetic valve 11, the second electromagnetic valve 13, the heat pump heat exchanger, the second three-way valve 14, the second-stage compressor B, the first three-way valve 12, the water-cooled condenser, the electronic expansion valve, the Chiller heat exchanger and the gas-liquid separator are sequentially connected to form a control loop, and the water-cooled condenser, the fourth electromagnetic valve 18, the warm air water pump, the warm air core, the third electromagnetic valve 16, the four-way electromagnetic valve, the heat pump heat exchanger, the third three-way valve 15 and the fourth three-way valve 17 are sequentially connected to form a control loop. Heat is dissipated through the Chiller heat exchanger, and heat is exchanged with the battery to heat the battery. The third environment temperature threshold can be set as needed, and is preferably 10℃. When the current environment temperature is greater than the second environment temperature threshold and less than or equal to the third environment temperature threshold, the battery needs little heat to discharge after being warmed up, but the passenger cabin temperature is not high, which affects the driving comfort, so the battery and the passenger cabin can be heated at the same time by directly applying the two-stage compressor heating method, the vehicle heat control can be realized, the vehicle driving comfort can be realized, the vehicle energy consumption can be reduced, and the winter range can be increased.

[0132] If the current environment temperature T1 is low, based on this, the first-stage compressor is controlled to compress the heat to heat the warm air core through the heat pump heat exchanger to heat the passenger cabin. The water-cooled condenser, the fourth electromagnetic valve 18, the warm air water pump, the warm air core, the third electromagnetic valve 16, the four-way electromagnetic valve, the heat pump heat exchanger, the third three-way valve 15 and the fourth three-way valve 17 are sequentially connected to form a control loop. Heat is exchanged between the warm air core and the passenger cabin to heat the passenger cabin, the vehicle heat control can be realized, and the vehicle driving comfort can be realized.

[0133] If the current ambient temperature T1 is in the general low temperature range in winter, for example, T1 > 10℃, only a small amount of heating is needed for the battery and the passenger cabin at this time. Based on this, if the current ambient temperature is greater than the third ambient temperature threshold, the first stage compressor is started to start the heat pump heating. At this time, the first stage compressor A, the first three-way valve 12, the water-cooled condenser, the electronic expansion valve, the Chiller heat exchanger and the gas-liquid separator are sequentially connected to form a control loop. Among them, the first stage compressor A heats up, the Chiller heat exchanger exchanges heat with the battery, and the battery is heated in a small amount, which can meet the power demand of the vehicle. At the same time, the water-cooled condenser, the fourth electromagnetic valve 18, the heating water pump, the heating core, the third electromagnetic valve 16, the third three-way valve 15 and the fourth three-way valve 17 are sequentially connected to form a control loop, wherein the heating core is heated by the water-cooled condenser, and the heating core exchanges heat with the passenger cabin to achieve small-scale heating and insulation of the passenger cabin. Since the discharge capacity of the battery only needs to be increased slightly to meet the vehicle demand, and the passenger cabin only needs to be heated slightly, the total heat required is not much, so only the first stage compressor is started to start the heat pump heating, which can realize the vehicle heat control, increase the winter range, and realize the vehicle driving comfort.

[0134] The following takes the second ambient temperature threshold as -10℃, the third ambient temperature threshold as 10℃, and the first outlet temperature threshold as 60℃ as an example, combined with the vehicle air conditioning system in Figure 1 Figure 5 The control method of the vehicle air conditioning system includes: Step 300: The whole vehicle is powered on.

[0135] Step 301: Monitor the current ambient temperature T1.

[0136] Step 302: The current ambient temperature T1 satisfies -10 < T1 ≤ 10℃.

[0137] When -10℃ < T1 ≤ -10℃, the battery is slightly limited in discharging at this temperature, and the heat required for battery heating and discharging is not large.

[0138] Step 303: Control the compressor heat pump to start, and the first stage compressor compresses the refrigerant to flow through the heat pump heat exchanger into the second stage compressor. The double-stage compressor compresses the refrigerant to flow through the water-cooled condenser and the Chiller heat exchanger to heat the battery and the heating core.

[0139] ​-10℃ < T1≤ -10℃, control the opening and closing of the relevant valve body, so that the first stage compressor A, the first electromagnetic valve 11, the second electromagnetic valve 13, the heat pump heat exchanger, the second three-way valve 14, the second stage compressor B, the first three-way valve 12, the water-cooled condenser, the electronic expansion valve, the Chiller heat exchanger and the gas-liquid separator are sequentially connected to form a control loop, the Chiller heat exchanger exchanges heat with the battery, and the battery is heated, and the warm air core is heated and warmed up at the same time.

[0140] Step 304: The first stage compressor compression heat heats the warm air core through the heat pump heat exchanger, and the blower is turned on.

[0141] At this time, control the opening and closing of the relevant valve body, so that the water-cooled condenser, the fourth electromagnetic valve 18, the warm air pump, the warm air core, the third electromagnetic valve 16, the four-way electromagnetic valve, the heat pump heat exchanger, the third three-way valve 15 and the fourth three-way valve 17 are sequentially connected to form a control loop, the warm air core is heated, the blower is turned on, the warm air core exchanges heat with the passenger compartment, and the passenger compartment is quickly heated and kept warm.

[0142] -10℃ < T1≤ -10℃, the environmental conditions remain unchanged, the first stage compressor A, the first electromagnetic valve 11, the second electromagnetic valve 13, the heat pump heat exchanger, the second three-way valve 14, the second stage compressor B, the first three-way valve 12, the water-cooled condenser, the electronic expansion valve, the Chiller heat exchanger and the gas-liquid separator are sequentially connected to form a control loop, and the water-cooled condenser, the fourth electromagnetic valve 18, the warm air pump, the warm air core, the third electromagnetic valve 16, the four-way electromagnetic valve, the heat pump heat exchanger, the third three-way valve 15 and the fourth three-way valve 17 are sequentially connected to form a control loop, and the passenger compartment is quickly heated and kept warm.

[0143] Step 402: The current environmental temperature T1 satisfies T1 > 10℃.

[0144] When T1 > 10℃, the current environmental temperature T1 is in the general low temperature range in winter, at this time the passenger compartment temperature is suitable, and the discharge capacity of the battery only needs to be increased slightly to meet the vehicle demand.

[0145] Step 403: Control the first stage compressor to start the heat pump heating.

[0146] At this time, the opening and closing of the related valves are controlled, so that the first-stage compressor, the first three-way valve 12, the water-cooled condenser, the electronic expansion valve, the Chiller heat exchanger, and the gas-liquid separator are sequentially connected to form a control loop, wherein the Chiller heat exchanger exchanges heat with the battery to heat and keep warm the battery. At the same time, the water-cooled condenser, the fourth solenoid valve 18, the warm air water pump, the warm air core, the third solenoid valve 16, the third three-way valve 15, and the fourth three-way valve 17 are sequentially connected to form a control loop, wherein the warm air core is heated by the water-cooled condenser, and at the same time, the warm air core exchanges heat with the passenger compartment to heat and keep warm the passenger compartment.

[0147] If the environmental conditions of T1>10℃ remain unchanged, the two control loops remain unchanged, and the heating and keeping warm of the battery and the passenger compartment are continuously realized.

[0148] Considering that the user manually increases the temperature of the passenger compartment or manually turns on the air conditioner during the driving of the vehicle, for example, the user directly sets the temperature of the passenger compartment to a target temperature or manually turns on the air conditioner and sets the temperature of the air conditioner to the target temperature. At this time, it is urgently needed to increase the temperature of the passenger compartment to the target temperature. Based on this, the heating module further includes a heat pump heat exchanger, a water-cooled condenser, a Chiller heat exchanger, and a warm air core. The double-stage compressor further includes a second-stage compressor. Optionally, if the air conditioner state is that the user increases the temperature of the passenger compartment or the air conditioner is turned on by the user, the passenger compartment is preferentially heated; after the double-stage compressor is controlled to compress, the refrigerant flows through the water-cooled condenser and the Chiller heat exchanger to heat the battery and the warm air core, the motor blocked rotor heating mode is controlled to flow through the heat pump heat exchanger and the warm air core; the air conditioner outlet temperature of the passenger compartment is monitored; if the air conditioner outlet temperature of the passenger compartment increases to the target temperature, the motor blocked rotor heating mode is turned off, the double-stage compressor is controlled to compress, the refrigerant flows through the water-cooled condenser and the Chiller heat exchanger to heat the battery and the passenger compartment, and the first-stage compressor is controlled to compress the heat to heat the warm air core through the heat pump heat exchanger to heat and keep warm the passenger compartment. When the passenger compartment has an urgent heating demand, the passenger compartment is preferentially heated, at this time, the motor blocked rotor heating and the double-stage compressor heating are applied to heat the battery and the passenger compartment at the same time until the air conditioner outlet temperature of the passenger compartment reaches the target temperature, and then the motor blocked rotor heating mode is turned off and only the double-stage compressor heating mode is applied to heat and keep warm the battery and the passenger compartment at the same time. By adjusting the heat priority, the vehicle heat control can be realized, the vehicle driving comfort can be realized, the whole vehicle energy consumption can be reduced, and the winter range can be increased.

[0149] If the air conditioning state is that the user increases the passenger cabin temperature, or the air conditioning is turned on by the user to indicate that the high passenger cabin temperature is increased to the target temperature, the control is preferentially heated to the passenger cabin. The control two-stage compressor compressed refrigerant flows through the water-cooled condenser and the Chiller heat exchanger to heat the battery and the heater core, the first-stage compressor A, the first solenoid valve 11, the second solenoid valve 13, the second three-way valve 14, the second-stage compressor B, the first three-way valve 12, the water-cooled condenser, the electronic expansion valve, the Chiller heat exchanger and the gas-liquid separator are sequentially connected to form a control loop, the battery is heated through the Chiller heat exchanger, and the heater core is heated through the water-cooled condenser, so as to heat the passenger cabin. The motor locked-rotor heat flows through the heat pump heat exchanger and the heater core to heat the heater core, and the motor, the sixth three-way valve 20, the four-way solenoid valve, the heat pump heat exchanger, the third three-way valve 15, the fourth three-way valve 17, the fourth solenoid valve 18, the heater water pump, the heater core, the third solenoid valve 16, the four-way solenoid valve, the Chiller heat exchanger, the fifth three-way valve 19 and the motor water pump are sequentially connected to form a control loop. The blower is turned on to exchange heat between the heater core and the passenger cabin through the blower to heat the passenger cabin, and the temperature of the passenger cabin is increased. The passenger cabin temperature is detected by monitoring the air conditioning outlet temperature of the passenger cabin.

[0150] If the air conditioning outlet temperature increases to the target temperature, it indicates that the passenger cabin has been heated to the target temperature, at which time the four-way solenoid valve and the motor locked-rotor heating mode can be closed, and only the two-stage compressor compressed refrigerant flows through the water-cooled condenser and the Chiller heat exchanger to heat the battery and the passenger cabin. The first-stage compressor A, the first solenoid valve 11, the second solenoid valve 13, the second three-way valve 14, the second-stage compressor B, the first three-way valve 12, the water-cooled condenser, the electronic expansion valve, the Chiller heat exchanger and the gas-liquid separator are sequentially connected to form a control loop. Among them, the first-stage compressor A heats, and the Chiller heat exchanger exchanges heat with the battery to heat the battery. At the same time, the water-cooled condenser, the fourth solenoid valve 18, the heater water pump, the heater core, the third solenoid valve 16, the four-way solenoid valve, the heat pump heat exchanger, the third three-way valve 15 and the fourth three-way valve 17 are sequentially connected to form a control loop, and the first-stage compressor compressed heat is controlled to heat the heater core through the heat pump heat exchanger to heat and keep warm the passenger cabin.

[0151] It should be noted that the user manually increases the passenger cabin temperature, or manually turns on the air conditioning, which can occur at any time during the entire vehicle driving process, that is, it can occur in any control process under the above environmental conditions.

[0152] The following takes receiving the first control signal of increasing the passenger cabin temperature or the second control signal of turning on the air conditioning as an example, combined with the vehicle air conditioning system in the foregoing Figure 1 , such asFigure 6 The control method of the vehicle air conditioning system comprises the following steps: Step 500: The user manually raises the temperature of the passenger compartment or manually turns on the air conditioner, and the heating of the passenger compartment is controlled to be given priority.

[0153] During the driving of the vehicle, the user manually raises the temperature of the passenger compartment or manually turns on the air conditioner, for example, the user directly sets the temperature of the passenger compartment to a target temperature or manually turns on the air conditioner and sets the temperature of the air conditioner to the target temperature. It indicates that the temperature of the passenger compartment needs to be raised to the target temperature urgently.

[0154] Step 501: Control the two-stage compressor to make the compressed refrigerant flow through the water-cooled condenser and the Chiller heat exchanger, and at the same time, the battery and the heater core are warmed up, the motor is blocked to heat the heat pump heat exchanger and the heater core, and the blower is turned on.

[0155] The related valve bodies are controlled to be opened and closed, so that the first-stage compressor A, the first electromagnetic valve 11, the second electromagnetic valve 13, the heat pump heat exchanger, the second three-way valve 14, the second-stage compressor B, the first three-way valve 12, the water-cooled condenser, the electronic expansion valve, the Chiller heat exchanger, and the gas-liquid separator are sequentially and circularly connected to form a control loop. Through the Chiller heat exchanger and the battery heat exchanger, the heating of the battery is realized. At the same time, the water-cooled condenser, the fourth electromagnetic valve 18, the heater water pump, the heater core, the third electromagnetic valve 16, the four-way electromagnetic valve, the heat pump heat exchanger, the third three-way valve 15, and the fourth three-way valve 17 are sequentially and circularly connected to form a control loop, the heater core is heated, and at the same time, the blower is turned on, so that the heater core exchanges heat with the passenger compartment to realize the rapid heating of the passenger compartment.

[0156] At the same time, the motor blocked heat generation mode is controlled to be turned on, the related valve bodies are controlled to be opened and closed, the motor, the sixth three-way valve 20, the four-way electromagnetic valve, the heat pump heat exchanger, the third three-way valve 15, the fourth three-way valve 17, the fourth electromagnetic valve 18, the heater water pump, the heater core, the third electromagnetic valve 16, the four-way electromagnetic valve, the Chiller heat exchanger, the fifth three-way valve 19, and the motor water pump are sequentially and circularly connected to form a control loop, the heating of the battery is realized through the Chiller heat exchanger and the battery heat exchanger, and the rapid heating of the passenger compartment is realized through the heater core and the passenger compartment heat exchange.

[0157] Step 502: Monitor the temperature T5 of the air outlet of the passenger compartment air conditioner.

[0158] Step 503: Determine whether T4≥T0℃. If yes, execute step 504. Otherwise, return to step 502.

[0159] The outlet temperature of the air conditioner is raised to the target temperature, which indicates that the temperature of the passenger compartment has been heated to the target temperature.

[0160] Step 504: close the motor locked-rotor heating mode, the double-stage compressor compressed refrigerant flows through the water-cooled condenser and the Chiller heat exchanger, while heating the battery and the cabin, the first-stage compressor compression heat heats the heater core through the heat pump heat exchanger, realizing rapid heating and heat preservation of the passenger cabin.

[0161] Close the motor locked-rotor heating mode, only apply double-stage compression heating to heat and preserve the battery and the cabin. Control the related valve body to open and close, so that the first-stage compressor A, the first electromagnetic valve 11, the second electromagnetic valve 13, the second three-way valve 14, the second-stage compressor, the first three-way valve 12, the water-cooled condenser, the electronic expansion valve, the Chiller heat exchanger, and the gas-liquid separator are sequentially connected to form a control loop. The heating of the battery is realized through the Chiller heat exchanger and the battery heat exchanger. At the same time, the water-cooled condenser, the fourth electromagnetic valve 18, the heater core, the third electromagnetic valve 16, the four-way electromagnetic valve, the heat pump heat exchanger, the third three-way valve 15, and the fourth three-way valve 17 are sequentially connected to form a control loop, the heater core is heated, and the blower is turned on, so that the heater core exchanges heat with the passenger cabin, realizing rapid heating and heat preservation of the passenger cabin.

[0162] The control method of the vehicle air conditioning system of the embodiment of the application controls the heating module to heat the battery of the vehicle in the first working mode based on current temperature information; the current temperature information includes: current environment temperature, current battery temperature, and current outlet temperature of the first compressor; the first working mode includes at least one of the motor locked-rotor heating mode, the single-stage compression heating mode, and the double-stage compression heating mode; when the current state meets the passenger cabin heating condition, the heating module is controlled to heat the passenger cabin of the vehicle in the second working mode, the second working mode includes the double-stage compression heating mode, or the combination of the double-stage compression heating mode and the motor locked-rotor heating mode; the current state includes at least one of the air conditioning state and the current temperature information, and one of the motor locked-rotor heating mode, the single-stage compression heating mode, and the double-stage compression heating mode is adjusted to heat the battery and / or the passenger cabin according to the current environment temperature, the current battery temperature, and the current outlet temperature of the first compressor, so as to realize vehicle heat control, vehicle driving comfort, reduce vehicle energy consumption, and increase winter range.

[0163] Through the description of the above embodiments, those skilled in the art can understand that, for the convenience and brevity of description, only the division of the above functional modules is taken as an example for illustration, and in actual application, the above functions can be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above.

[0164] In the embodiments of the present disclosure, it should be understood that the disclosed apparatus and method can be implemented in other manners. For example, the described apparatus embodiments are merely schematic. The division of the modules or units is merely logical function division. There can be another division manner in actual implementation. For example, a plurality of units or components can be combined or integrated into another apparatus, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections can be indirect couplings or communication connections through some interfaces, apparatuses or units, and can be in electrical, mechanical or other forms.

[0165] In the description of the present disclosure, it should be understood that the orientation or positional relationship indicated by the terms such as "upper", "lower", "front", "back", "left" and "right" is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the present disclosure and simplifying the description, and does not indicate or imply that the indicated position or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present disclosure.

[0166] It should be noted that in the embodiments of the present application, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. It should also be noted that the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the processes, methods, articles or devices including a series of elements not only include those elements, but also include other elements not explicitly listed or inherent to such processes, methods, articles or devices. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or device including the element.

[0167] The above merely provides an embodiment of the present disclosure, and is not intended to limit the present disclosure. The present disclosure can have various changes and modifications for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present disclosure shall be included in the scope of the claims of the present disclosure.

Claims

1. A control method for a vehicle air conditioning system, characterized in that, The vehicle air conditioning system includes: a heating module, the heating module including a motor and a two-stage compressor, the two-stage compressor including a first-stage compressor; the control method includes: Based on the current temperature information, the heating module is controlled to heat the vehicle's battery in a first operating mode; the current temperature information includes: the current ambient temperature, the current battery temperature, and the current outlet temperature of the first compressor; the first operating mode includes at least one of: motor stall heating mode, single-stage compression heating mode, and two-stage compression heating mode. When the current state meets the conditions for heating the passenger compartment, the heating module is controlled to heat the passenger compartment of the vehicle in the second working mode. The second working mode includes a two-stage compression heating mode, or a combination of a two-stage compression heating mode and a motor stall heating mode. The current state includes at least one of the air conditioning status and the current temperature information.

2. The control method according to claim 1, characterized in that, The step of determining a first operating mode based on current temperature information and controlling the heating module to heat the vehicle's battery in the first operating mode includes: If the current ambient temperature is less than or equal to the first ambient temperature threshold, the heating module is controlled to heat the vehicle's battery in motor stall heating mode and two-stage compression heating mode according to the current battery temperature and the current outlet temperature. If the current ambient temperature is greater than the first ambient temperature threshold and less than or equal to the third ambient temperature threshold, the heating module is controlled to heat the vehicle's battery in a two-stage compression heating mode according to the current battery temperature and the current outlet temperature. If the current ambient temperature is greater than the third ambient temperature threshold, the heating module is controlled to start the first-stage compressor in single-stage compression heating mode to start the heat pump for heating the vehicle's battery.

3. The control method according to claim 2, characterized in that, The heating module further includes a heat pump heat exchanger, a water-cooled condenser, and a Chiller heat exchanger; the two-stage compressor further includes a second-stage compressor; the step of controlling the heating module to heat the vehicle's battery in motor stall heating mode and two-stage compression heating mode based on the current battery temperature and the current outlet temperature if the current ambient temperature is less than or equal to a first ambient temperature threshold includes: If the current ambient temperature is less than or equal to the first ambient temperature threshold, the battery heating and the heat pump heat exchanger heat storage are controlled to be performed in the motor stall heating mode. If the battery is heated to a temperature greater than or equal to the first battery temperature threshold, the heat pump heating of the two-stage compressor is turned on, and the refrigerant is compressed by the first-stage compressor and flows through the heat pump heat exchanger into the second-stage compressor, where the refrigerant absorbs the heat from the heat pump heat exchanger. The battery is heated in the two-stage compression heating mode according to the current outlet temperature until the current outlet temperature is greater than or equal to the first outlet temperature threshold. If the current outlet temperature is greater than or equal to the second outlet temperature threshold, the motor stall heating mode is turned off. If the current outlet temperature is greater than or equal to the first outlet temperature threshold, the first stage compressor is controlled to compress the refrigerant and then flow through the water-cooled condenser and the Chiller heat exchanger, which only store heat, to heat the battery until the battery is heated to a temperature greater than or equal to the second battery temperature threshold.

4. The control method according to claim 3, characterized in that, The step of heating the battery in the two-stage compression heating mode according to the current outlet temperature until the current outlet temperature is greater than or equal to a first outlet temperature threshold, wherein if the current outlet temperature is greater than or equal to a second outlet temperature threshold, the motor stall heating mode is turned off, including: If the current outlet temperature is less than the second outlet temperature threshold, the first stage compressor compresses the refrigerant and then flows through the heat pump heat exchanger into the second stage compressor, where the refrigerant absorbs heat from the heat pump heat exchanger. If the current outlet temperature is greater than or equal to the second outlet temperature threshold and less than the first outlet temperature threshold, then the motor stall heating mode is turned off, and the refrigerant is controlled to directly enter the second stage compressor after being compressed by the first stage compressor. The refrigerant after being compressed by the two-stage compressor is controlled to flow through the water-cooled condenser and the Chiller heat exchanger, which only store heat, to heat the battery.

5. The control method according to claim 2, characterized in that, The heating module further includes a heat pump heat exchanger, a water-cooled condenser, and a Chiller heat exchanger; the two-stage compressor further includes a second-stage compressor; if the current ambient temperature is greater than the first ambient temperature threshold and less than or equal to the third ambient temperature threshold, controlling the heating module to heat the vehicle's battery in the two-stage compression heating mode according to the current battery temperature and the current outlet temperature includes: If the current ambient temperature is greater than the first ambient temperature threshold and less than or equal to the second ambient temperature threshold, the heat pump heating of the two-stage compressor is turned on, the refrigerant is compressed by the first-stage compressor and then directly enters the second-stage compressor, and the refrigerant after compression by the two-stage compressor flows through the water-cooled condenser and the Chiller heat exchanger, which only store heat, to heat the battery. If the battery is heated to a temperature greater than or equal to a first battery temperature threshold, and the current outlet temperature is greater than or equal to the first outlet temperature threshold, then the first-stage compressor is controlled to compress the refrigerant and then flow it through the water-cooled condenser and the Chiller heat exchanger (which only store heat) to heat the battery until the battery is heated to a temperature greater than or equal to a second battery temperature threshold.

6. The control method according to claim 3 or 5, characterized in that, The heating module further includes a heater core and a blower; when the current state meets the passenger compartment heating conditions, controlling the heating module to heat the passenger compartment of the vehicle in a second operating mode includes: The first stage compressor compresses the refrigerant, which then flows through the water-cooled condenser and the Chiller heat exchanger. The heater pump is then turned on, and the heat generated by the first stage compressor is exchanged with the heat of the heater core. If the battery is heated to a temperature greater than or equal to the second battery temperature threshold, the refrigerant compressed by the two-stage compressor is controlled to flow through the water-cooled condenser and the Chiller heat exchanger to heat the occupant compartment. The heat from the first-stage compressor is controlled to be transferred to the heat pump heat exchanger to heat the warm air core, thereby heating and insulating the passenger compartment.

7. The control method according to claim 2, characterized in that, The heating module further includes a heat pump heat exchanger, a water-cooled condenser, a Chiller heat exchanger, and a heater core; the two-stage compressor further includes a second-stage compressor; the method of controlling the heating module to heat the vehicle's battery in two-stage compression heating mode based on the current battery temperature and the current outlet temperature, if the current ambient temperature is greater than a first ambient temperature threshold and less than or equal to a third ambient temperature threshold, further includes: If the current ambient temperature is greater than the second ambient temperature threshold and less than or equal to the third ambient temperature threshold, the heat pump heating of the two-stage compressor is turned on. The refrigerant is compressed by the first-stage compressor and flows through the heat pump heat exchanger into the second-stage compressor. The refrigerant compressed by the two-stage compressor flows through the water-cooled condenser and the Chiller heat exchanger to heat the battery and the warm air core.

8. The control method according to claim 7, characterized in that, When the current state meets the conditions for heating the passenger compartment, the heating module is controlled to heat the passenger compartment of the vehicle in a second operating mode. This second operating mode includes a two-stage compression heating mode, or a combination of a two-stage compression heating mode and a stalled motor heating mode. After the refrigerant is compressed by the two-stage compressor, it flows through the water-cooled condenser and the Chiller heat exchanger. Then, the heat from the first-stage compressor is used to heat the heater core through the heat pump heat exchanger to heat the passenger compartment.

9. The control method according to claim 1, characterized in that, The heating module further includes a heat pump heat exchanger, a water-cooled condenser, a Chiller heat exchanger, and a heater core; the two-stage compressor further includes a second-stage compressor; when the current state meets the passenger compartment heating conditions, the heating module is controlled to heat the vehicle's passenger compartment in a second operating mode, the second operating mode including a two-stage compression heating mode, or a combination of a two-stage compression heating mode and a motor stall heating mode, and further includes: If the air conditioning status is that the user has increased the passenger cabin temperature, or the air conditioning has been turned on by the user, then the passenger cabin is controlled to be heated first. The refrigerant compressed by the two-stage compressor is controlled to flow through the water-cooled condenser and the Chiller heat exchanger to heat the battery and the heater core. The motor is controlled to stop rotating and generate heat by flowing through the heat pump heat exchanger and the heater core. Monitor the air conditioning outlet temperature in the crew compartment; If the air conditioner outlet temperature rises to the target temperature, the motor stall heating mode is turned off, and the refrigerant compressed by the two-stage compressor flows through the water-cooled condenser and the Chiller heat exchanger to heat the battery and the passenger compartment. The heat from the first-stage compressor is also controlled to heat the heater core through the heat pump heat exchanger to heat and keep the passenger compartment warm.

10. A vehicle air conditioning system, characterized in that, The vehicle air conditioning system includes: a heating module, the heating module including a motor and a two-stage compressor, the two-stage compressor including a first-stage compressor; The vehicle air conditioning system further includes: a controller, the controller being used for: Based on the current temperature information, the heating module is controlled to heat the vehicle's battery in a first operating mode; the current temperature information includes: the current ambient temperature, the current battery temperature, and the current outlet temperature of the first compressor; the first operating mode includes at least one of: motor stall heating mode, single-stage compression heating mode, and two-stage compression heating mode. When the current state meets the conditions for heating the passenger compartment, the heating module is controlled to heat the passenger compartment of the vehicle in the second working mode. The second working mode includes a two-stage compression heating mode, or a combination of a two-stage compression heating mode and a motor stall heating mode. The current state includes at least one of the air conditioning status and the current temperature information.

11. A vehicle, characterized in that, The vehicle includes: the vehicle air conditioning system as described in claim 9.

Images