Vehicle air conditioning system and its control method

Abstract

The present invention provides an in-vehicle air conditioning system and a control method thereof, belonging to the technical field of air conditioning. The in-vehicle air conditioning system includes a refrigeration and heating refrigerant sub-circulation system and a hot water heating sub-circulation system. Among them, the refrigeration and heating refrigerant sub-circulation system includes a first heat exchanger located in the passenger compartment that forms a refrigerant cycle, a second heat exchanger located outdoors, a mechanical compressor and an electric compressor connected in parallel, and a throttling element. The mechanical compressor can be driven by the vehicle's engine to operate. The hot water heating sub-circulation system includes a third heat exchanger located in the passenger compartment and an engine radiator corresponding to the engine. The hot water in the engine radiator can be driven by a water pump to circulate between the third heat exchanger and the engine radiator. The present invention can meet the refrigeration and heating requirements in the driving state and the parking state by controlling the corresponding operation of different sub-circulation systems and operation modes, with relatively low transformation cost and relatively small increase in the vehicle's overall weight.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioning, and particularly relates to a vehicle-mounted air conditioning system and a control method thereof. Background Art

[0002] Because the traditional truck-mounted air conditioner relies on the engine to drive the compressor to achieve refrigeration, and the heating is achieved by using the waste heat of the engine. If the original vehicle air conditioner is used during the intermediate parking rest and loading period, not only the fuel consumption is high, but also there are associated risks such as exhaust gas pollution and engine wear. The 24V electric parking air conditioner solves this problem and has almost become a necessary product in the truck market. However, for the vehicle manufacturer, adding an additional independent parking air conditioner will undoubtedly greatly increase the cost and weight. Therefore, it is an urgent problem to propose a vehicle-mounted air conditioning system that can integrate the parking air conditioner with the original vehicle air conditioner. Based on this, the present invention is proposed. Summary of the Invention

[0003] Therefore, the present invention provides a vehicle-mounted air conditioning system and a control method thereof, which can solve the technical problems in the prior art that a vehicle-mounted air conditioning system needs to add an additional independent parking air conditioner to achieve refrigeration and heating of the target space of the vehicle, resulting in high vehicle cost and increased weight.

[0004] To solve the above problems, the present invention provides a vehicle-mounted air conditioning system, including a refrigeration and heating refrigerant sub-circulation system and a hot water heating sub-circulation system. Among them, the refrigeration and heating refrigerant sub-circulation system includes a first heat exchanger in the passenger compartment that forms a refrigerant cycle, a second heat exchanger outdoors, a mechanical compressor and an electric compressor connected in parallel, and a throttling element connected in series between the first heat exchanger and the second heat exchanger. The mechanical compressor can be driven by the vehicle engine to operate. The hot water heating sub-circulation system includes a third heat exchanger in the passenger compartment and an engine radiator corresponding to the engine. The hot water in the engine radiator can be driven by a water pump to circulate between the third heat exchanger and the engine radiator.

[0005] In some embodiments, the refrigeration and heating refrigerant sub-circulation system further includes a first three-way valve and a second three-way valve. Among them, the first port of the first three-way valve and the first port of the second three-way valve are aggregated and connected to the first port of the first heat exchanger. The second port of the first three-way valve is connected to the suction ports of the mechanical compressor and the electric compressor. The third port of the first three-way valve and the second port of the second three-way valve are aggregated and connected to the first port of the second heat exchanger. The third port of the second three-way valve is connected to the exhaust ports of the mechanical compressor and the electric compressor.

[0006] In some embodiments, check valves are respectively arranged on the exhaust pipelines of the mechanical compressor and the electric compressor.

[0007] In some embodiments, the first heat exchanger and the third heat exchanger are located in the air duct, and a blower is also provided in the air duct.

[0008] The present invention also provides a control method for a vehicle air conditioning system, which is used to control the operation of the above vehicle air conditioning system. The control method includes the following steps:

[0009] Obtain the operating mode of the vehicle air conditioning system and the operating state of the engine;

[0010] Control the operation of the refrigeration and heating refrigerant sub-circulation system or the hot water heating sub-circulation system according to the operating mode and the operating state.

[0011] In some embodiments, the operating mode includes a heating mode and a cooling mode, and the operating state includes a driving state and a parking state.

[0012] In some embodiments, controlling the operation of the refrigeration and heating refrigerant sub-circulation system or the hot water heating sub-circulation system according to the operating mode and the operating state includes:

[0013] When the operating mode is the heating mode and the operating state is the driving state, control both the mechanical compressor and the electric compressor to be in the shutdown state, and control the water pump to operate; or,

[0014] When the operating mode is the heating mode and the operating state is the parking state, control the electric compressor to be in the operating state, control both the water pump and the mechanical compressor to be in the shutdown state, and control the second port and the third port of the first three-way valve to be connected, and the first port and the third port of the second three-way valve to be connected.

[0015] In some embodiments, controlling the operation of the refrigeration and heating refrigerant sub-circulation system or the hot water heating sub-circulation system according to the operating mode and the operating state includes:

[0016] When the operating mode is the cooling mode and the operating state is the parking state, control the electric compressor to be in the operating state, control both the mechanical compressor and the water pump to be in the shutdown state, and control the first port and the second port of the first three-way valve to be connected, and the second port and the third port of the second three-way valve to be connected; or,

[0017] When the operating mode is the cooling mode and the operating state is the driving state,

[0018] Obtain the ambient temperature Th in the passenger compartment;

[0019] Judge the first magnitude relationship between Th and the ambient temperature threshold Ty and the second magnitude relationship between |Th - Ts| and the temperature difference threshold Tr, where Ts is the refrigeration target temperature set by the user;

[0020] According to the first magnitude relationship and the second magnitude relationship, control one of the electric compressor and the mechanical compressor to operate and control the first port and the second port of the first three-way valve to communicate, and the second port and the third port of the second three-way valve to communicate.

[0021] In some embodiments, according to the first magnitude relationship and the second magnitude relationship, controlling one of the electric compressor and the mechanical compressor to operate, and controlling the first three-way valve and the second three-way valve to switch to the corresponding flow paths includes:

[0022] When the first magnitude relationship is Th > Ty and the second magnitude relationship is |Th - Ts| > Tr, control the mechanical compressor to be in the operating state;

[0023] Otherwise, control the electric compressor to be in the operating state.

[0024] An on-vehicle air-conditioning system and a control method thereof provided by the present invention are based on the original air-conditioning system of the vehicle, and only a small number of components are added to make the entire on-vehicle air-conditioning system have both heating and cooling modes, and can meet the refrigeration and heating requirements in the driving state and the parking state by controlling the corresponding operation or non-operation of different sub-cycle systems and operation modes. The transformation cost is relatively low and the increase in the vehicle weight is relatively small. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the principle of the on-vehicle air-conditioning system according to an embodiment of the present invention;

[0026] Figure 2 is Figure 1 a schematic diagram of the refrigerant flow direction of the on-vehicle air-conditioning system in the refrigeration mode with the mechanical compressor operating in

[0027] Figure 3 is Figure 1 a schematic diagram of the refrigerant flow direction of the on-vehicle air-conditioning system in the refrigeration mode with the electric compressor operating in

[0028] Figure 4 is Figure 1 a schematic diagram of the water flow direction of the on-vehicle air-conditioning system in the heating mode with the water pump operating in

[0029] Figure 5 is Figure 1Schematic diagram of the refrigerant flow of the in-vehicle air conditioning system operating in the heating mode with an electric compressor. In the figure, the dotted pipeline represents that the corresponding executing component is not operating.

[0030] The reference numerals are indicated as:

[0031] 10. First heat exchanger; 11. Second heat exchanger; 12. Mechanical compressor; 13. Electric compressor; 14. First three-way valve; 15. Second three-way valve; 16. Throttle element; 17. Check valve; 20. Third heat exchanger; 21. Engine radiator; 22. Water pump; 100. Air duct; 101. Fan. Detailed implementation manners

[0032] Referring to Figures 1 to 5 As shown, according to an embodiment of the present invention, an in-vehicle air conditioning system is provided, which includes a refrigeration and heating refrigerant sub-circulation system and a hot water heating sub-circulation system. Among them, the refrigeration and heating refrigerant sub-circulation system includes a first heat exchanger 10 in the passenger compartment (such as the driver's cab, and in some vehicle models, it can also be the passenger compartment, etc.), a second heat exchanger 11 outdoors, a mechanical compressor 12 and an electric compressor 13 connected in parallel, and a throttle element 16 connected in series between the first heat exchanger 10 and the second heat exchanger 11. The mechanical compressor 12 can be driven by the vehicle engine to operate. The hot water heating sub-circulation system includes a third heat exchanger 20 in the passenger compartment and an engine radiator 21 corresponding to the engine. The hot water in the engine radiator 21 can be driven by a water pump 22 to circulate between the third heat exchanger 20 and the engine radiator 21.

[0033] In this technical solution, based on the original vehicle air conditioning system, that is, most of the components in this in-vehicle air conditioning system share the original air conditioning system, and only a small number of components are added to make the whole in-vehicle air conditioning system have both heating and cooling modes, and can meet the refrigeration and heating requirements in the driving state and the parking state by controlling the corresponding operation or non-operation of different sub-circulation systems and operation modes. The transformation cost is relatively low and the vehicle weight increase is small. In addition, it is worth mentioning that the energy efficiency of using the electric compressor 13 for heating is more than 4 times that of the traditional fuel heater, saving transportation costs, reducing environmental pollution, and greatly improving comfort.

[0034] In a specific embodiment, referring to Figure 1As shown in the figure, the refrigeration and heating refrigerant sub-circulation system further includes a first three-way valve 14 and a second three-way valve 15. Among them, the first port of the first three-way valve 14 is aggregated with the first port of the second three-way valve 15 and communicated with the first port of the first heat exchanger 10. The second port of the first three-way valve 14 is communicated with the suction ports of the mechanical compressor 12 and the electric compressor 13. The third port of the first three-way valve 14 is aggregated with the second port of the second three-way valve 15 and communicated with the first port of the second heat exchanger 11. The third port of the second three-way valve 15 is communicated with the discharge ports of the mechanical compressor 12 and the electric compressor 13. In this technical solution, the first three-way valve 14 and the second three-way valve 15 form a connection for each component in the refrigeration and heating refrigerant sub-circulation system through pipelines, and the refrigeration and heating switching of the air-conditioning system or the switching correspondence of the executing components can be realized by switching the flow paths in the two three-way valves. Both the structure and the control are relatively simple. In a preferred embodiment, check valves 17 are respectively arranged on the exhaust pipelines of the mechanical compressor 12 and the electric compressor 13. The aforementioned first three-way valve 14 and second three-way valve 15 can specifically adopt normally closed three-way solenoid valves.

[0035] The first heat exchanger 10 and the third heat exchanger 20 are located in the air duct 100, and a fan 101 is also provided in the air duct 100. In this way, through one fan 101, the heat exchange between the air flow and the first heat exchanger 10 and the third heat exchanger 20 in the air duct 100 can be driven simultaneously, without the need to separately configure fans, reducing costs.

[0036] According to an embodiment of the present invention, a control method for a vehicle-mounted air-conditioning system is further provided for controlling the operation of the above-mentioned vehicle-mounted air-conditioning system. The control method includes the following steps:

[0037] Obtain the operating mode of the vehicle-mounted air-conditioning system and the operating state of the engine. Specifically, the operating mode includes a heating mode and a cooling mode, and the operating state includes a driving state and a parking state. It can be understood that the engine of the vehicle is in an operating state during the driving state, while the engine of the vehicle is in a shutdown state during the parking state;

[0038] Control the operation of the refrigeration and heating refrigerant sub-circulation system or the hot water heating sub-circulation system according to the operating mode and the operating state.

[0039] In this technical solution, while judging the operating mode of the air-conditioning system, the operating state of the engine is also judged, and accordingly, the corresponding executing components can be controlled to operate to achieve automatic and intelligent operation.

[0040] Controlling the operation of the refrigeration and heating refrigerant sub-circulation system or the hot water heating sub-circulation system according to the operating mode and the operating state specifically includes:

[0041] When the operation mode is the heating mode and the operation state is the driving state, control the mechanical compressor 12 and the electric compressor 13 to be in the shutdown state, and control the water pump 22 to operate. For details, see Figure 4 As shown, at this time, neither the mechanical compressor 12 nor the electric compressor 13 is operating. The heating in the passenger compartment is completely provided by the hot water in the engine radiator 21, which is energy-saving and environmentally friendly and realizes the full utilization of waste heat. Or, when the operation mode is the heating mode and the operation state is the parking state, control the electric compressor 13 to be in the operating state, control the water pump 22 and the mechanical compressor 12 to be in the shutdown state, and control the second port and the third port of the first three-way valve 14 to be connected, and the first port and the third port of the second three-way valve 15 to be connected. For details, see Figure 5 As shown, at this time, the electric compressor 13 is controlled to operate. Its high-temperature and high-pressure refrigerant flows through the second three-way valve 15 to the first heat exchanger 10 to heat the passenger compartment and then flows back to the electric compressor 13 through the second heat exchanger 11 and the first three-way valve 14, realizing the heating cycle of the refrigerant.

[0042] In some other embodiments, controlling the operation of the refrigeration and heating refrigerant sub-circulation system or the hot water heating sub-circulation system according to the operation mode and the operation state specifically includes:

[0043] When the operation mode is the cooling mode and the operation state is the parking state, control the electric compressor 13 to be in the operating state, control the mechanical compressor 12 and the water pump 22 to be in the shutdown state, and control the first port and the second port of the first three-way valve 14 to be connected, and the second port and the third port of the second three-way valve 15 to be connected. For details, see Figure 3 As shown, at this time, the electric compressor 13 is controlled to operate. Its high-temperature and high-pressure refrigerant flows through the second three-way valve 15 to the second heat exchanger 11 and then flows back to the electric compressor 13 through the first heat exchanger 10 and the first three-way valve 14, realizing the cooling cycle of the refrigerant. Or, when the operation mode is the cooling mode and the operation state is the driving state, obtain the ambient temperature Th in the passenger compartment;

[0044] Judge the first magnitude relationship between Th and the ambient temperature threshold Ty and the second magnitude relationship between |Th - Ts| and the temperature difference threshold Tr, where Ts is the set cooling target temperature of the user;

[0045] According to the first magnitude relationship and the second magnitude relationship, control one of the electric compressor 13 and the mechanical compressor 12 to operate and control the first port and the second port of the first three-way valve 14 to communicate, and the second port and the third port of the second three-way valve 15 to communicate. Specifically, according to the first magnitude relationship and the second magnitude relationship, control one of the electric compressor 13 and the mechanical compressor 12 to operate, and control the first three-way valve 14 and the second three-way valve 15 to switch to the corresponding flow paths, including: when the first magnitude relationship is Th > Ty and the second magnitude relationship is |Th - Ts| > Tr, it indicates that the refrigeration demand in the crew cabin is relatively large at this time, and a larger cooling load is required. Therefore, control the mechanical compressor 12 to be in the operating state. Refer to Figure 2 As shown, the mechanical compressor 12 is controlled to operate, and its high-temperature and high-pressure refrigerant flows through the second three-way valve 15 to the second heat exchanger 11, and then returns to the mechanical compressor 12 through the first heat exchanger 10 and the first three-way valve 14 to realize the refrigeration cycle of the refrigerant; otherwise, control the electric compressor 13 to be in the operating state. Through this control method, the automatic switching of the electric compressor 13 and the mechanical compressor 12 according to the cooling load is realized, which can reduce the fuel consumption of the engine and reduce the operating cost.

[0046] It is easy for those skilled in the art to understand that, on the premise of no conflict, the advantageous technical features of the above various methods can be freely combined and superimposed.

[0047] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above is only the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present invention, several improvements and variations can be made, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A vehicle air conditioning system, characterized in that, It includes a refrigeration and heating refrigerant sub-circulation system and a hot water heating sub-circulation system. Among them, the refrigeration and heating refrigerant sub-circulation system includes a first heat exchanger (10) inside the passenger compartment that forms a refrigerant cycle, a second heat exchanger (11) outside the vehicle, a mechanical compressor (12) and an electric compressor (13) connected in parallel, and a throttling element (16) connected in series between the first heat exchanger (10) and the second heat exchanger (11). The mechanical compressor (12) can be driven by the vehicle's engine to operate. The hot water heating sub-circulation system includes a third heat exchanger (20) inside the passenger compartment and an engine radiator (21) corresponding to the engine. The hot water in the engine radiator (21) can be driven by a water pump (22) to circulate between the third heat exchanger (20) and the engine radiator (21). The refrigeration and heating refrigerant sub-circulation system also includes a first three-way valve (14) and a second three-way valve (15). Among them, the first port of the first three-way valve (14) and the first port of the second three-way valve (15) are aggregated and connected to the first port of the first heat exchanger (10). The second port of the first three-way valve (14) is connected to the suction ports of the mechanical compressor (12) and the electric compressor (13). The third port of the first three-way valve (14) and the second port of the second three-way valve (15) are aggregated and connected to the first port of the second heat exchanger (11). The third port of the second three-way valve (15) is connected to the exhaust ports of the mechanical compressor (12) and the electric compressor (13).

2. The vehicle-mounted air conditioning system according to claim 1, characterized in that, Check valves (17) are respectively arranged on the exhaust pipe lines of the mechanical compressor (12) and the electric compressor (13).

3. The vehicle-mounted air-conditioning system according to claim 1, characterized in that, The first heat exchanger (10) and the third heat exchanger (20) are inside the air duct (100), and a blower (101) is also arranged inside the air duct (100).

4. A control method for a vehicle air conditioning system, characterized in that, For controlling the operation of the vehicle-mounted air conditioning system according to any one of claims 1 to 3, the control method includes the following steps: Obtain the operation mode of the vehicle-mounted air conditioning system and the operation state of the engine; Control the operation of the refrigeration and heating refrigerant sub-circulation system or the hot water heating sub-circulation system according to the operation mode and the operation state.

5. The control method according to claim 4, characterized in that, The operation mode includes a heating mode and a cooling mode, and the operation state includes a driving state and a parking state.

6. The control method according to claim 5, characterized in that Controlling the operation of the refrigeration and heating refrigerant sub-circulation system or the hot water heating sub-circulation system according to the operation mode and the operation state includes: When the operation mode is the heating mode and the operation state is the driving state, control both the mechanical compressor (12) and the electric compressor (13) to be in a stopped state, and control the water pump (22) to operate; or, When the operating mode is the heating mode and the operating state is the parked state, control the electric compressor (13) to be in the operating state, control the water pump (22) and the mechanical compressor (12) to be in the stopped state, and control the second port and the third port of the first three-way valve (14) to be communicated, and the first port and the third port of the second three-way valve (15) to be communicated.

7. The control method according to claim 5, wherein Controlling the operation of the refrigeration and heating refrigerant sub-circulation system or the hot water heating sub-circulation system according to the operating mode and the operating state includes: When the operating mode is the refrigeration mode and the operating state is the parked state, control the electric compressor (13) to be in the operating state, control the mechanical compressor (12) and the water pump (22) to be in the stopped state, and control the first port and the second port of the first three-way valve (14) to be communicated, and the second port and the third port of the second three-way valve (15) to be communicated; or, When the operating mode is the refrigeration mode and the operating state is the driving state, Obtain the ambient temperature Th in the passenger compartment; Judge the first magnitude relationship between Th and the ambient temperature threshold Ty and the second magnitude relationship between |Th - Ts| and the temperature difference threshold Tr, where Ts is the set refrigeration target temperature of the user; According to the first magnitude relationship and the second magnitude relationship, control one of the electric compressor (13) and the mechanical compressor (12) to operate and control the first port and the second port of the first three-way valve (14) to be communicated, and the second port and the third port of the second three-way valve (15) to be communicated.

8. The control method according to claim 7, wherein According to the first magnitude relationship and the second magnitude relationship, control one of the electric compressor (13) and the mechanical compressor (12) to operate, and control the first three-way valve (14) and the second three-way valve (15) to switch to the corresponding flow paths, including: When the first magnitude relationship is Th > Ty and the second magnitude relationship is |Th - Ts| > Tr, control the mechanical compressor (12) to be in the operating state; Otherwise, control the electric compressor (13) to be in the operating state.

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