CN104422024B

CN104422024B - Automotive air-conditioning system and its control method

Info

Publication number: CN104422024B
Application number: CN201310401335.XA
Authority: CN
Inventors: 谭永翔; 陈绍龙; 刘维华; 黄宁杰
Original assignee: Hangzhou Sanhua Research Institute Co Ltd
Current assignee: Hangzhou Sanhua Research Institute Co Ltd
Priority date: 2013-09-05
Filing date: 2013-09-05
Publication date: 2019-03-12
Anticipated expiration: 2033-09-05
Also published as: CN104422024A

Abstract

The present invention discloses a kind of automotive air-conditioning system and its control method, air-conditioning system includes compressor, First Heat Exchanger, the first expansion device, the second heat exchanger, and outdoor heat exchanger, the second expansion device, the compressor, the outdoor heat exchanger, first expansion device, the First Heat Exchanger can sequential communication formed refrigerating circuit, the compressor, second heat exchanger, the First Heat Exchanger, second expansion device, the outdoor heat exchanger can sequential communication formed heating circuit.The automotive air-conditioning system, its First Heat Exchanger both participates in refrigeration and also assists in heating, when executing heating mode, air stream can be through First Heat Exchanger, the second heat exchanger reheating, the heating capacity of air-conditioning system is enhanced, so as to provide enough heating air streams, so as to can also obtain comfortably environment by bus under low temperature environment.

Description

Automotive air-conditioning system and its control method

Technical field

The present invention relates to air-conditioning technical field, in particular to a kind of automotive air-conditioning system and its control method.

Background technique

Referring to FIG. 1, Fig. 1 is a kind of typical electric automobile air-conditioning system.

The electric automobile air-conditioning system includes compressor 1 ', gas-liquid separator 2 ', outdoor heat exchanger 3 ', the first shut-off valve 4 ', second shut-off valve 5 ', third shut-off valve 6 ', the 4th shut-off valve 7 ', expansion device 9 ' and air-conditioning box 100 ' etc., each component Complete heat pump air conditioning system is formed by corresponding piping connection.

Air-conditioning box 100 ' specifically includes cycle throttle 106 ', interior circulating air opening 107 ', outer circulation air port 108 ', air blower 104 ', First Heat Exchanger 101 ', temperature damper 105 ', the second heat exchanger 102 ', electric heater 103 ' and grid air duct 109 ' Deng.Interior circulating air opening 107 ' and outer circulation air port 108 ' to enter air-conditioning box 100 ' through cycle throttle 106 ' to be mixing wind, Mixed proportion can be required by system according to comfort, be controlled by cycle throttle 106 '.

The working principle of the air-conditioning system is as follows:

Refrigeration mode:

First shut-off valve 4 ', third shut-off valve 6 ' are opened, and the second shut-off valve 5 ', the 4th shut-off valve 7 ' are closed.Compressor 1 ' The gaseous refrigerant of low-temp low-pressure is compressed into the gaseous refrigerant of high temperature and pressure, refrigerant flows through the second heat exchanger 102 ', warp The first shut-off valve 4 ' is crossed into outdoor heat exchanger 3 '；

The refrigerant of high temperature and pressure exchanges heat in outdoor heat exchanger 3 ' with flow of outside air D, and refrigerant discharges heat, release Heat taken in external environment air by air stream D, refrigerant then undergoes phase transition and is condensed into liquid or gas-liquid two-phase cold-producing medium；

Refrigerant flows out outdoor heat exchanger 3 ', expands into expansion device 9 ', and decrease temperature and pressure becomes the refrigeration of low-temp low-pressure Agent；

The refrigerant of low-temp low-pressure enters First Heat Exchanger 101 ', exchanges heat with air-flow A or mixed airflow A, and absorbing should The heat of air-flow A, air-flow A cooling are cold air B, and refrigerant is then undergone phase transition and most of gaseous state system for flashing to low-temp low-pressure Cryogen.At this point, the cold air formed through the heat exchange of First Heat Exchanger 101 ' is changed directly around second since temperature damper 105 ' is closed Hot device 102 ' and enter grid air duct 109 ', and be admitted in car room, reduce vehicle room temperature, environment by bus is provided comfortably； And when setting temperature is higher, temperature damper 105 ' can also partially open carry out heat exchange.

Low-temperature low-pressure refrigerant after 101 ' phase transformation of First Heat Exchanger flows to gas-liquid separator 2 ', liquid refrigerant storage In gas-liquid separator 2 ', the gaseous refrigerant of low-temp low-pressure is compressed into the gaseous refrigerant of high temperature and pressure by compressor 1 ' again, Such cycle operation.

Heating mode:

First shut-off valve 4 ', third shut-off valve 6 ' are closed, and the second shut-off valve 5 ', the 4th shut-off valve 7 ' are opened.Compressor 1 ' The gaseous refrigerant of low-temp low-pressure is compressed into the gaseous refrigerant of high temperature and pressure, refrigerant flows through the second heat exchanger 102 '；This When, temperature damper 105 ' is opened, and the refrigerant of high temperature and pressure exchanges heat with air stream B in the second heat exchanger 102 ' and cools down, quilt The air stream C of heating is then admitted in car room through grid air duct 109 ', to improve vehicle room temperature, provides comfortably ring by bus Border；

Since third shut-off valve 6 ' is closed, refrigerant can only flow to the expansion of expansion device 9 ', and it is low that decrease temperature and pressure becomes low temperature The refrigerant of pressure, at this point, First Heat Exchanger 101 ' does not work；

The refrigerant of low-temp low-pressure enters outdoor heat exchanger 3 ', absorbs the heat in extraneous air stream D, Xiang Biancheng low pressure gas State refrigerant；

Then refrigerant flow direction gas-liquid separator 2 ', liquid refrigerant are stored in gas-liquid separator 2 ', low-temp low-pressure Gaseous refrigerant is compressed into the gaseous refrigerant of high temperature and pressure, such cycle operation by compressor 1 ' again.

However, there are following technical problems for above scheme:

First, second heat exchanger 102 ' is limited by 100 ' structure of air-conditioning box, and exchange capability of heat is limited, in low temperature environment Under, such as when close to subzero 20 DEG C, it is not able to satisfy heat demand, causes supply air temperature low, is unable to satisfy passenger comfort requirement；

The second, describe and understand in conjunction with attached drawing, the fluid in the air-conditioning system pipeline from above-mentioned working principle, in heating and Freeze both of which under, flow through the contrary of outdoor heat exchanger 3 ', it is difficult to meet fluid two kinds flow direction in have it is good Thermodynamic property and dynamic performance, to be difficult to take into account refrigeration and heat have good performance.

In view of this, how automotive air-conditioning system is improved, so that vehicle can obtain preferable ride at low ambient temperatures Environment is those skilled in the art's technical problem urgently to be resolved.

Summary of the invention

In order to solve the above technical problems, it is an object of the present invention to provide automotive air-conditioning system and its control methods.The automobile Air-conditioning system, which makes vehicle at low ambient temperatures, can obtain relatively good environment by bus.

Automotive air-conditioning system provided by the invention, including compressor, First Heat Exchanger, the first expansion device, the second heat exchange Device and outdoor heat exchanger, the second expansion device, the compressor, the outdoor heat exchanger, first expansion device, institute State First Heat Exchanger can sequential communication formed refrigerating circuit, the compressor, second heat exchanger, it is described first heat exchange Device, second expansion device, the outdoor heat exchanger being capable of sequential communication formation heating circuits；It is empty and in heating mode Air-flow first flows through the First Heat Exchanger and carries out heat exchange heating, then passes through second heat exchanger.

The automotive air-conditioning system, First Heat Exchanger both participates in refrigeration and also assists in heating, when executing heating mode, air Stream can be through First Heat Exchanger, the second heat exchanger reheating, and the heating capacity of air-conditioning system is enhanced, so as to provide foot Enough heating air streams, so as to can also obtain comfortably environment by bus under low temperature environment.

The first concrete scheme, the import of the second heat exchanger described in the outlet of the compressor, second heat exchange The outlet of device is connected to the outdoor heat exchanger by a branch, and the import of the First Heat Exchanger is connected to by another branch；Institute It states and is equipped with temperature damper at the second heat exchanger, the temperature damper is opened when heating.

The outlet of second of concrete scheme, the compressor is connected to the outdoor heat exchanger by a branch, by another Branch is connected to the import of second heat exchanger.

The outlet of the third concrete scheme, second heat exchanger is changed by first expansion device connection described first The import of hot device, the first expansion device are electric expansion valve.

4th kind of concrete scheme, first expansion device are parallel with by-passing valve.

5th kind of concrete scheme, a header of the outdoor heat exchanger be equipped with refrigerating circuit import and heating circuit into Mouthful；Distribution pipe is equipped in the header, the heating circuit inlet is directly connected to the distribution pipe；The refrigerating circuit into Mouth is directly connected to the header, and the refrigerating circuit import is mutually independent with the distribution pipe.

6th kind of concrete scheme further includes presetting the First Heat Exchanger degree of supercooling, the outdoor heat exchanger degree of superheat Controller；

The controller first obtains the degree of superheat of the outdoor heat exchanger, and compared with the preset degree of superheat described in adjusting The aperture of second expansion device；After adjusting, the controller also obtains the degree of supercooling of the First Heat Exchanger, and with preset mistake Cold degree compares to adjust the aperture of first expansion device；

Or, the controller first obtains the degree of supercooling of the First Heat Exchanger, and to adjust compared with preset degree of supercooling The aperture of first expansion device；After adjusting, the controller also obtains the degree of superheat of the outdoor heat exchanger, and with it is default The degree of superheat compare to adjust the aperture of second expansion device.

7th kind of concrete scheme further includes presetting the First Heat Exchanger degree of supercooling, the second heat exchanger degree of supercooling Controller；

The controller first obtains the degree of supercooling of second heat exchanger, and compared with preset degree of supercooling described in adjusting The aperture of first expansion device；After adjusting, the controller also obtains the degree of supercooling of the First Heat Exchanger, and with preset mistake Cold degree compares to adjust the aperture of second expansion device；

Or, the controller obtains the degree of supercooling of the First Heat Exchanger, and to adjust compared with preset degree of supercooling State the aperture of the second expansion device；After adjusting, the controller also obtains the degree of supercooling of second heat exchanger, and with it is preset Degree of supercooling compares to adjust the aperture of first expansion device.

8th kind of concrete scheme further includes battery, battery heat exchanger and third expansion device in communication, the third The import of expansion device can be connected to the outlet of the outdoor heat exchanger and the outlet of second heat exchanger；The battery changes The import of compressor described in the outlet of hot device.

9th kind of concrete scheme, the battery case including accommodating the battery, the battery heat exchanger；The battery case into Be equipped at air port with the interior circulating air opening being connected in car room, with the outer circulation air port that is connected to, and the interior circulated air of adjusting in the compartment outside The cycle throttle of mouth and outer circulation air port.

Tenth kind of concrete scheme, is additionally provided with the first air duct and the second air duct, and the control battery case air outlet with First air duct, second air duct on-off inside and outside air door；First air duct is connected to the interior circulating air opening, and described the Outside two air duct open cars.

The application also provides a kind of control method of automotive air-conditioning system as described in the third above-mentioned scheme, including following Step:

The degree of superheat of corresponding outdoor heat exchanger and the degree of supercooling of First Heat Exchanger are obtained according to setting operating condition and temperature；

By detecting the outlet pressure of outdoor heat exchanger, the practical degree of superheat of outlet temperature acquisition outdoor heat exchanger, pass through Detect the outlet pressure of First Heat Exchanger, the practical degree of supercooling of outlet temperature acquisition First Heat Exchanger；

Carry out aperture regulation, wherein the second expansion device is heating power expansion valve or electric expansion valve:

First compare the practical degree of superheat of outdoor heat exchanger and the preset degree of superheat, if the former is greater than the latter, it is swollen to increase by second Swollen device aperture；The former is less than the latter, reduces the second expansion device aperture；The former is equal to the latter, then keeps the second expansion device Current aperture it is constant；

Compare the practical degree of supercooling of First Heat Exchanger and preset degree of supercooling again, if the former is greater than the latter, it is swollen to reduce first Swollen device aperture；The former is less than the latter, increases by the first expansion device aperture；The former is equal to the latter, keeps the first expansion device Current aperture is constant；

Or, first comparing the practical degree of supercooling of First Heat Exchanger and preset degree of supercooling, if the former is greater than the latter, reduce first Expansion device aperture；The former is less than the latter, then increases by the first expansion device aperture；The former is equal to the latter, then keeps the first expansion The current aperture of device is constant；

Compare the practical degree of superheat of outdoor heat exchanger and the preset degree of superheat again, if the former is greater than the latter, it is swollen to increase by second Swollen device aperture；The former is less than the latter, then reduces the second expansion device aperture；The former is equal to the latter, keeps the second expansion device Current aperture it is constant.

The application also provides the control method of another automotive air-conditioning system as described in the third above-mentioned scheme, including under State step:

The degree of supercooling of corresponding second heat exchanger and the degree of supercooling of First Heat Exchanger are obtained according to setting operating condition and temperature；

By detecting the outlet pressure of the second heat exchanger, the practical degree of supercooling of outlet temperature the second heat exchanger of acquisition, pass through Detect the outlet pressure of First Heat Exchanger, the practical degree of supercooling of outlet temperature acquisition First Heat Exchanger；

Carry out aperture regulation, wherein the second expansion device is electric expansion valve:

First compare the practical degree of supercooling of the second heat exchanger and preset degree of supercooling, if the former is greater than the latter, it is swollen to increase by first Swollen device aperture；The former is less than the latter, reduces the first expansion device aperture；The former is equal to the latter, then keeps the first expansion device Current aperture it is constant；

Compare the practical degree of supercooling of First Heat Exchanger and preset degree of supercooling again, if the former is greater than the latter, it is swollen to increase by second Swollen device aperture；The former is less than the latter, reduces the second expansion device aperture；The former is equal to the latter, keeps the second expansion device Current aperture is constant；

Or, first comparing the practical degree of supercooling of First Heat Exchanger and preset degree of supercooling, if the former is greater than the latter, increase by second Expansion device aperture；The former is less than the latter, then reduces the second expansion device aperture；The former is equal to the latter, then keeps the second expansion The current aperture of device is constant；

Compare the practical degree of supercooling of the second heat exchanger and preset degree of supercooling again, if the former is greater than the latter, it is swollen to increase by first Swollen device aperture；The former is less than the latter, then reduces the first expansion device aperture；The former is equal to the latter, keeps the first expansion device Current aperture it is constant.

Above two control method successively controls the aperture of an expansion device, can be to another after an expansion device is adjusted Expansion device generates certain influence, adjusts another expansion device aperture again at this time, indeed achieves the connection of two expansion devices Control is closed, so that final adjusted result realizes the optimized control of two expansion devices as close possible to practical adjustments demand.

Detailed description of the invention

Fig. 1 is a kind of typical electric automobile air-conditioning system；

Fig. 2 is the structural schematic diagram of the first specific embodiment of automotive air-conditioning system provided by the present invention；

Fig. 3 is refrigerant flowpath schematic diagram when air-conditioning system is in refrigeration mode in Fig. 2, wherein thickened portion table Show flow path；

Fig. 4 is in refrigerant flowpath schematic diagram when heating mode for air-conditioning system in Fig. 2, wherein thickened portion table Show flow path；

Fig. 5 is in refrigerant flowpath schematic diagram when the first dehumidification mode for air-conditioning system in Fig. 2, wherein overstriking portion Dividing indicates flow path；

Fig. 6 is in refrigerant flowpath schematic diagram when the second dehumidification mode for air-conditioning system in Fig. 2, wherein overstriking portion Dividing indicates flow path；

Fig. 7 is in refrigerant flowpath schematic diagram when defrosting mode for air-conditioning system in Fig. 2, wherein thickened portion table Show flow path；

Fig. 8 is the structural schematic diagram of second of specific embodiment of automotive air-conditioning system provided by the present invention；

Fig. 9 is the structural schematic diagram of the third specific embodiment of automotive air-conditioning system provided by the present invention；

Figure 10 is a kind of structural schematic diagram of specific embodiment of outdoor heat exchanger in automotive air-conditioning system provided by the present invention；

Figure 11 is the first control principle drawing of expansion device under heating mode in Fig. 4, and dotted line shows feedback signal；

Figure 12 is the control flow chart of two expansion devices in control figure 11；

Figure 13 is second of control principle drawing of expansion device under heating mode in Fig. 4, and dotted line shows feedback signal；

Figure 14 is the control flow chart of two expansion devices in control figure 13；

Figure 15 is the structural schematic diagram of 4th kind of specific embodiment of automotive air-conditioning system provided by the present invention；

Figure 16 is refrigerant flowpath schematic diagram when air-conditioning system is in refrigeration mode in Figure 15, wherein thickened portion Indicate flow path；

Figure 17 is in refrigerant flowpath schematic diagram when heating mode for air-conditioning system in Figure 15, wherein thickened portion Indicate flow path；

Figure 18 is refrigerant flowing when air-conditioning system is in heating mode and is in battery waste heat take-back model in Figure 15 Path schematic diagram, wherein thickened portion indicates flow path.

In Fig. 1:

1 ' compressor, 2 ' gas-liquid separators, 3 ' outdoor heat exchangers, 4 ' first shut-off valves, 5 ' second shut-off valves, 6 ' thirds are cut Only valve, 7 ' the 4th shut-off valves, 9 ' expansion devices, 10 ' check valves, 100 ' air-conditioning boxs, 101 ' First Heat Exchangers, 102 ' second heat exchange Device, 104 ' air blowers, 105 ' temperature dampers, 106 ' cycle throttles, circulating air opening in 107 ', follows outside 108 ' at 103 ' electric heaters Ring air port, 109 ' grid air ducts

In Fig. 2-18:

1 compressor, 2 gas-liquid separators, 3 outdoor heat exchangers, 31 refrigerating circuit imports, 32 heating circuit inlets, outside Room 33 The outlet of heat exchanger, 34 distribution pipes, 35 dispensing orifices, 36 inlet headers, 37 outlet collection pipes, 38 flat tubes, 39 fins, 4 first Shut-off valve, 5 second shut-off valves, 6 third shut-off valves, 7 the 4th shut-off valves, 8 first expansion devices, 81 by-passing valves, 9 second expansion dresses It sets, 10 check valves, 11 the 5th shut-off valves, 12 third expansion devices, 100 air-conditioning boxs, 101 First Heat Exchangers, 1,011 first heat exchange The outlet of device, 102 second heat exchangers, the outlet of 1,021 second heat exchangers, 103 first electric heaters, 104 first air blowers, 105 Temperature damper, 106 first circulation air doors, circulating air opening, 108 first outer circulation air ports, 109 grid air ducts, 200 in 107 first Battery case, 201 battery heat exchangers, 202 second electric heaters, 203 second air blowers, 204 second circulation air doors, outside 205 second Circulating air opening, circulating air opening, 300 batteries, 401 wind inlet channels, 402 exhaust air flues, 403 first air ducts, 404 in 206 second Two air ducts, air door inside and outside 405

Specific embodiment

It is with reference to the accompanying drawing and specific real in order to make those skilled in the art more fully understand technical solution of the present invention Applying example, the present invention is described in further detail.

Referring to FIG. 2, Fig. 2 is the structural schematic diagram of the first specific embodiment of automotive air-conditioning system provided by the present invention.

The automotive air-conditioning system, including compressor 1, First Heat Exchanger 101 and with the first expansion device of its inlet communication 8, the second heat exchanger 102 and outdoor heat exchanger 3 and the second expansion device 9 with its inlet communication, expansion device is followed in air-conditioning It can play the role of decrease temperature and pressure in loop system, generally there is throttle pipe, common heating power expansion valve or electric expansion valve etc..Tool Body, air-conditioning box 100 can be set, First Heat Exchanger 101 and the second heat exchanger 102 are placed in air-conditioning box 100.

Wherein, compressor 1, outdoor heat exchanger 3, the first expansion device 8, First Heat Exchanger 101 can sequential communication formed Refrigerating circuit.In the present embodiment, compressor 1, the second heat exchanger 102, First Heat Exchanger 101, the second expansion device 9, outdoor are changed Hot device 3 can sequential communication formed heating circuit, i.e. First Heat Exchanger 101 and the second heat exchanger 102 is in heating mode Shi Junke To provide heat.

In addition, the entrance of compressor 1 can be equipped with gas-liquid separator 2, to be separated to backflow refrigerant, i.e., will Liquid part therein is stored in gas-liquid separator 2, and the gaseous refrigerant part of low-temp low-pressure then enters compressor 1 again Compression.Certainly, for some novel compressors, gas-liquid separator 2 can also be not provided with.

Specifically, as shown in Fig. 2, the air-conditioning system includes the first shut-off valve 4, the second shut-off valve 5, third shut-off valve 6, the Four shut-off valves 7, the first expansion device 8, the second expansion device 9, First Heat Exchanger 101, the second heat exchanger 102, outdoor heat exchanger 3, compressor 1.The outlet of the import of second heat exchanger 102 and the outlet of compressor 1, the second heat exchanger 102 has two Branch, a branch are the access between the outlet of the second heat exchanger 102 and 3 import of outdoor heat exchanger, and the first shut-off valve 4 is set to the branch Road；Another branch is the import of the second heat exchanger 102 outlet and the first expansion device 8, and the second shut-off valve 5 is set to the branch. Above-mentioned each shut-off valve is specifically as follows hand stop valve, can also use electric and pneumatic shut-off valve.

The outlet of outdoor heat exchanger 3 also has two branches, and a branch is between its outlet and 8 import of the first expansion device Access, the check valve 10 of the access settable one-way conduction outdoor heat exchanger 3 and the first expansion device 8, so as not to refrigerant return Stream；Another branch is the access between the outlet of outdoor heat exchanger 3 and 1 import of compressor, and third shut-off valve 6 is set to the branch.

The outlet of First Heat Exchanger 101 also has two branches, and a branch is connected to the import of compressor 1, which sets There is the 4th shut-off valve 7；Another branch is connected to the import of outdoor heat exchanger 3, and the second expansion device 9 is set to the branch.

Rationally to be controlled convenient for the air stream to entrance First Heat Exchanger 101, the second heat exchanger 102, air-conditioning box 100 Circulating air opening 107 and the first outer circulation air port 108 in settable first, circulating air opening 107 is connected to car in first, follows outside first Outside 108 open car of ring air port, first circulation air door 106 then controls circulating air opening 107 and the second outer circulation air port 205 in first Aperture, to adjust the mixing wind ratio entered from first circulation air door 106 in air-conditioning box 100, mixed proportion can be by system It being required according to comfort, is controlled by first circulation air door 106, the ratio of interior circulated air can not cause vehicle window fogging to be target, Circulated air can further save the energy in introducing.

Further, it is also possible to which the first air blower 104 is arranged, the first air blower 104 be can be set in 106 He of first circulation air door Between First Heat Exchanger 101, so that the air stream A at first circulation air door 106 can smoothly flow to First Heat Exchanger 101, and finally swimmingly it flow to the air outlet of air-conditioning box 100.Grid wind is equipped in this embodiment at the air outlet of air-conditioning box 100 Road 109, to distribute air stream C and its wind direction is adjusted, air outlet is towards in passenger compartment.

It is appreciated that being introduced directly into the air stream outside compartment or in compartment is also even if being not provided with first circulation air door 106 It is feasible.Only, it is designed so that Performance for Air Conditioning Systems more optimizes.

The working principle of the air-conditioning system is as follows:

Refrigeration mode:

Referring to FIG. 3, Fig. 3 is refrigerant flowpath schematic diagram when air-conditioning system is in refrigeration mode in Fig. 2, wherein Thickened portion indicates refrigerant flowpath.

First shut-off valve 4, the 4th shut-off valve 7 are opened, and the second shut-off valve 5, third shut-off valve 6 are closed.The consumption of compressor 1 one The gaseous refrigerant of low-temp low-pressure, is compressed into the gaseous refrigerant of high temperature and pressure by fixed electric energy, and refrigerant flows through the second heat exchange Device 102 enters outdoor heat exchanger 3 by the first shut-off valve 4；At this point, temperature damper 105 can close, by the second heat exchanger 102 It blocks completely, to prevent air-flow B and the second heat exchanger 102 from exchanging heat, therefore the gaseous refrigerant of high temperature and pressure flows through the second heat exchanger 102 do not exchange heat, but flow directly into the first shut-off valve 4；

The refrigerant of high temperature and pressure exchanges heat in outdoor heat exchanger 3 with flow of outside air D, and refrigerant discharges heat, release Heat taken in external environment air by air stream D, refrigerant then cooling undergoes phase transition and is condensed into liquid；

Refrigerant flows out outdoor heat exchanger 3, expands into the first expansion device 8, and decrease temperature and pressure becomes the system of low-temp low-pressure Cryogen；

The refrigerant of low-temp low-pressure enters First Heat Exchanger 101, carries out with the air-flow A entered from first circulation air door 106 Heat exchange absorbs the heat of air-flow A, and air-flow A cooling is cold air B, and refrigerant then at least partially undergoes phase transition and flashes to The gaseous refrigerant of low-temp low-pressure.At this point, since temperature damper 105 is closed, the cold air through the heat exchange formation of First Heat Exchanger 101 Enter grid air duct 109 directly around the second heat exchanger 102, and be admitted in car room, reduce vehicle room temperature, provides comfortable By bus environment；And when temperature setting is higher in car room, to avoid the wind of blowout too low, temperature damper 105 can open one Part blows in car room again after so that air stream B is heated up.

Low-temperature low-pressure refrigerant after 101 phase transformation of First Heat Exchanger flows to gas-liquid separator 2, the liquid refrigerant contained It is stored in gas-liquid separator 2, the gaseous refrigerant of low-temp low-pressure is compressed into the gaseous refrigerant of high temperature and pressure by compressor 1 again Agent, such cycle operation.

Heating mode:

Referring to FIG. 4, Fig. 4 is refrigerant flowpath schematic diagram when air-conditioning system is in heating mode in Fig. 2, wherein Thickened portion indicates refrigerant flowpath.

First shut-off valve 4, the 4th shut-off valve 7 are closed, and the second shut-off valve 5, third shut-off valve 6 are opened.The consumption of compressor 1 one The gaseous refrigerant of low-temp low-pressure, is compressed into the gaseous refrigerant of high temperature and pressure by fixed electric energy, and refrigerant flows through the second heat exchange Device 102；At this point, temperature damper 105 is opened, the refrigerant of high temperature and pressure exchanges heat in the second heat exchanger 102 with air stream B, system Cryogen is released heat and is cooled down；

Refrigerant continues to flow to the expansion of the first expansion device 8, and the aperture of the first expansion device 8 is larger at this time, refrigerant warp Decrease temperature and pressure becomes the refrigerant of medium temperature and medium pressure after preliminary expansion, at this moment since the airflow temperature come in outside car room is lower than the The temperature of refrigerant in one heat exchanger 101, refrigerant first exchange heat with air stream A, and air stream A is heated for the first time, warp Air stream B after preliminary heating is changed with the high-temperature high-pressure refrigerant for flowing through the second heat exchanger 102 again through temperature damper 105 Heat, then air stream B is heated for the second time；The air stream C of reheating can be admitted in car room through grid air duct 109, to improve Vehicle room temperature provides comfortably environment by bus；

The refrigerant of the medium temperature and medium pressure come out from First Heat Exchanger 101 is expanded through the second expansion device 9, current by abundant Throttling becomes the refrigerant of low-temp low-pressure；The refrigerant of low-temp low-pressure flows through outdoor heat exchanger 3, absorbs in extraneous air stream D Heat, Xiang Biancheng low-temp low-pressure gaseous refrigerant；

The refrigerant of low-temp low-pressure flows to gas-liquid separator 2 through third shut-off valve 6, and the liquid refrigerant contained is stored in gas In liquid/gas separator 2, the gaseous refrigerant of low-temp low-pressure is compressed into the gaseous refrigerant of high temperature and pressure by compressor 1 again, so follows Ring work.

In the embodiment, First Heat Exchanger 101 both participates in refrigeration and also assists in heating, when executing heating mode, air stream A Can through First Heat Exchanger 101,102 reheating of the second heat exchanger, and air stream A be first through refrigerant temperature it is relatively low the One heat exchanger 101 carries out heat exchange and tentatively heats up, and then heats up again through the second high heat exchanger 102 of temperature, such air-conditioning system Heating capacity further strengthened, so as to provide enough heating air stream C, so as to also can under low temperature environment Obtain environment of comfortably riding.

In addition, being equipped with the first expansion device 8, the first expansion device 8 between the second heat exchanger 102 and First Heat Exchanger 101 Suitable flow resistance is produced, so that the refrigerant in the second heat exchanger 102 is in high pressure, corresponding condensation temperature is also higher, Refrigerant is depressurized to intermediate pressure by the first expansion device 8 after the heat exchange of the second heat exchanger 102, and becomes medium temperature again The state of middle pressure, pressure will not be too high when on the one hand arriving First Heat Exchanger 101 in this way, and can tentatively be risen to air stream A Temperature, to obtain higher heat exchange efficiency.For air stream A, first passes through First Heat Exchanger 101 and be heated to intermediate temperature Degree, is heated to high temperature using the second heat exchanger 102 again, realizes counterflow heat exchange, heat transfer effect is preferable.Therefore, it heats When mode, the first expansion device 8 is set between First Heat Exchanger 101 and the second heat exchanger 102, and First Heat Exchanger 101 is utilized, The heat exchange efficiency for improving system further enhances heat capacity, and will not be substantially to the resistance to pressure request of First Heat Exchanger 101 It improves.

The outlet of second heat exchanger of embodiment 102 is connected to the import of First Heat Exchanger 101 by the first expansion device 8, To realize above-mentioned secondary heating process in a heating mode.In fact, an expansion device can also be separately provided, second is changed Hot device 102 is connected to equally possible by the expansion device with First Heat Exchanger 101, and only, embodiments described above utilize existing Reheating demand can be realized in the first expansion device 8 for being originally intended to refrigeration, and access design also more simplifies.

Furthermore it is also possible to the first electric heater 103 be arranged, as shown in figure 4, the first electric heater 103 is set to air-conditioning box 100 Between interior second heat exchanger 102 and the outlet of air-conditioning box 100, when ambient temperature is too low, heat pump performance is insufficient or heat pump When efficiency is lower or even breaks down and can not work normally, the auxiliary heating of the first electric heater 103 can be used, with heat pump system Heating function is realized together.

The first dehumidification mode, the second dehumidification mode and defrosting mode can also be performed in the air-conditioning system:

First dehumidification mode:

Referring to FIG. 5, Fig. 5 is refrigerant flowpath schematic diagram when air-conditioning system is in the first dehumidification mode in Fig. 2, Wherein thickened portion indicates flow path.

First shut-off valve 4, the 4th shut-off valve 7 are opened, and the second shut-off valve 5, the second expansion device 9 are closed (at this point, second is swollen Swollen device 9 has the function of opening and closing, such as electric expansion valve).Similar to refrigeration mode, temperature damper 105 is partially or completely at this time It opens, so that the cooling air stream B for exchanging heat and being formed with First Heat Exchanger 101 can be partly or completely full by the second heat exchanger 102. The air stream A then entered through first circulation air door 106, by cool-down dehumidification, becomes low temperature and low humidity air stream through First Heat Exchanger 101 B is heated to form low-humidity air stream C using the second heat exchanger 102, and air stream C, which is admitted in car room, can reduce vehicle humidity.

Obviously, relative humidity is larger in passenger compartment, and to when demand for heat amount is not very big, the first dehumidifying mould can be performed Formula avoids vapor from condensing on glass for vehicle window and influences the visual field to reach effect on moisture extraction, improves security performance.

Second dehumidification mode:

Referring to FIG. 6, Fig. 6 is refrigerant flowpath schematic diagram when air-conditioning system is in the second dehumidification mode in Fig. 2, Wherein thickened portion indicates flow path.

Second shut-off valve 5, third shut-off valve 6, the 4th shut-off valve 7 are opened, and the first shut-off valve 4 is closed, the second expansion device 9 It closes.It is similar to the first dehumidification mode, unlike, the refrigerant come out from the second heat exchanger 102 directly passes through the second cut-off Valve 5 enters the expansion of the first expansion device 8 and carries out decompression cooling, and temperature damper 105 is partially or completely opened at this time, so that air stream B can be partially or completely through the second heat exchanger 102.Air stream A, by cool-down dehumidification, becomes low temperature by First Heat Exchanger 101 The air stream B of low humidity is heated as comfortable low-humidity air stream C through the second heat exchanger 102, and is finally fed in car room, Indoor humidity is reduced, environment by bus is provided comfortably.

Second dehumidification mode be suitable for passenger compartment in humidity it is larger, and it is larger to demand for heat amount when use.

Defrosting mode:

Referring to FIG. 7, Fig. 7 is refrigerant flowpath schematic diagram when air-conditioning system is in defrosting mode in Fig. 2, wherein Thickened portion indicates flow path.

Under low temperature environment, in a heating mode the working time it is too long after, the easy frosting in the surface of outdoor heat exchanger 3 can reduce Heat exchange property is even lost, causes system effectiveness to reduce and even loses heat-production functions.At this point it is possible into defrosting mode:

First shut-off valve 4, third shut-off valve 6 are opened, and the second shut-off valve 5 is closed, the 4th shut-off valve 7 or the first expansion device 8 close, and the second expansion device 9 is closed.Compressor 1 consumes certain electric energy, and the gaseous refrigerant of low-temp low-pressure is compressed into height The gaseous refrigerant of warm high pressure, refrigerant flow through the second heat exchanger 102, and temperature damper 105 is partly or entirely opened, air stream B It is sent into car room after being heated, to increase room temperature, provides comfortably environment by bus；

The refrigerant for leaving the second heat exchanger 102 is released heat, made by the first shut-off valve 4 into outdoor heat exchanger 3 The frost on 3 surface of outdoor heat exchanger rapidly removes, and refrigerant leaves outdoor heat exchanger 3 and enters gas-liquid separation by third shut-off valve 6 Device 2, gas-liquid separator 2 separate the liquid refrigerant in refrigerant, and gaseous refrigerant returns to compressor 1, such cycle operation, Until the frost of outdoor heat exchanger 3 is effectively removed.

In the embodiment, which kind of mode no matter is executed, the high-temperature high-pressure refrigerant that compressor 1 provides requires to first pass through the Two heat exchangers 102, then two through its exit branch flows to First Heat Exchanger 101 or outdoor heat exchanger 3, and passes through temperature Degree air door 105 controls whether the second heat exchanger 102 participates in work.In fact, other modes can also be used.

As shown in figure 8, Fig. 8 is the structural schematic diagram of second of specific embodiment of automotive air-conditioning system provided by the present invention.

In the embodiment, the outlet of compressor 1 is equipped with two branches, and a branch is connected to the import of outdoor heat exchanger 3, the One shut-off valve 4 is set to the branch；Another branch is connected to the import of the second heat exchanger 102, and the second shut-off valve 5 is set to second and changes Hot device 102 is exported to the access of 8 import of the first expansion device.The setting of remaining access is similar to first embodiment.

The working principle of the air-conditioning system is similar with first embodiment, for succinct description, is shown here only in each Working mould The flow path of refrigerant, is no longer described in detail under formula.

Refrigeration mode:

First shut-off valve 4, the 4th shut-off valve 7 are opened, and the second shut-off valve 5, third shut-off valve 6 are closed:

The flow path of refrigerant: compressor 1- the first shut-off valve 4- outdoor heat exchanger the first expansion device of 3- 8- first is changed Hot the 4th shut-off valve 7- gas-liquid separator 2- compressor 1 of device 101-.

Heating mode:

First shut-off valve 4, the 4th shut-off valve 7 are closed, and the second shut-off valve 5, third shut-off valve 6 are opened；

The flow path of refrigerant: compressor 1- the second heat exchanger 102- the second shut-off valve the first expansion device of 5- 8- first Heat exchanger 101- the second expansion device 9- outdoor heat exchanger 3- third shut-off valve 6- gas-liquid separator 2- compressor 1.

First dehumidification mode:

First shut-off valve 4, the second shut-off valve 5, the 4th shut-off valve 7 are opened, and third shut-off valve 6 is closed, the second expansion device 9 It closes.

The flow path of refrigerant is divided into two:

1, the second shut-off valve of the second heat exchanger of compressor 1- 102- 5- the first expansion device 8- First Heat Exchanger 101- the 4th Shut-off valve 7- gas-liquid separator 2- compressor 1；

2, the 4th section of 101- of the first shut-off valve of compressor 1- 4- outdoor heat exchanger 3- the first expansion device 8- First Heat Exchanger Only valve 7- gas-liquid separator 2- compressor 1.

I.e. compressor 1 is exported to the refrigerant of two branches of outdoor heat exchanger 3 and the second heat exchanger 102 in the first expansion Converge at device 8, the flow of specific two branches can be controlled to adjust according to the temperature needed in car room.

Second dehumidification mode:

Second shut-off valve 5, third shut-off valve 6, the 4th shut-off valve 7 are opened, and the first shut-off valve 4 is closed, the second expansion device 9 It closes.

The flow path of refrigerant: compressor 1- the second heat exchanger 102- the second shut-off valve the first expansion device of 5- 8- first The 4th shut-off valve 7- gas-liquid separator 2- compressor 1 of heat exchanger 101-.

Defrosting mode:

First shut-off valve 4, third shut-off valve 6 are opened, and the second shut-off valve 5 is closed, the 4th shut-off valve 7 or the first expansion device 8 close, and the second expansion device 9 is closed.

The flow path of refrigerant:

Compressor 1- the first shut-off valve 4- outdoor heat exchanger 3- third shut-off valve 6- gas-liquid separator 2- compressor 1.

Compared with first embodiment, in the embodiment, when the second heat exchanger 102 is not involved in work, the height of compressor 1 is left Warm high-pressure refrigerant directly can flow to outdoor heat exchanger 3 through the first shut-off valve 4, without flowing to again through the second heat exchanger 102 Outdoor heat exchanger 3 can reduce the pressure loss of refrigerant.Certainly, compared to first embodiment, under the first dehumidification mode, the The refrigerant of two embodiment compressors 1 needs to distribute to two branches, the first shut-off valve 4, the second shut-off valve 5 one preferably wherein For flow control valve so that it is convenient to the control of sendout.

As shown in figure 9, Fig. 9 is the structural schematic diagram of the third specific embodiment of automotive air-conditioning system provided by the present invention.

The embodiment is similar with first embodiment, unlike, equipped with the by-passing valve 81 in parallel with the first expansion device 8. Then refrigerant can enter First Heat Exchanger 101 after the expansion of the first expansion device 8, directly can also enter first through by-passing valve 81 and change Hot device 101.

After by-passing valve 81 is arranged, other operational modes and first embodiment are essentially identical, and only heating mode can have two Kind operational mode:

The first method of operation, by-passing valve 81 are closed, and the first expansion device 8 is opened, with the first embodiment method of operation one It causes:

Second of method of operation, by-passing valve 81 are opened, and the first expansion device 8 is closed.The refrigeration flowed out through the second shut-off valve 5 Agent directly passes through by-passing valve 81 and enters First Heat Exchanger 101.Continued by the refrigerant of First Heat Exchanger 101 to from first circulation The air stream A heat release that air door 106 enters, becomes the refrigeration of low-pressure low-temperature after 9 decrease temperature and pressure of the second expansion device after heat exchange Agent, then outdoor heat exchanger 3 is flowed to, eventually flow to compressor 1.

Second of method of operation, the refrigerant for flowing to First Heat Exchanger 101 and the second heat exchanger 102 are in high pressure shape State, therefore be suitable for using when First Heat Exchanger 101 is identical as 102 bearing capacity of the second heat exchanger.Compared to second operation side Formula, as in the first embodiment, due to being equipped between First Heat Exchanger 101 and the second heat exchanger 102 in the first method of operation First expansion device 8, so that the refrigerant in First Heat Exchanger 101 is the gas-liquid two-phase cold-producing medium of medium temperature and medium pressure, heat exchange efficiency It is high；Furthermore, it is possible to which the First Heat Exchanger 101 using bearing capacity less than the second heat exchanger 102, intermediate condensation pressure are still in The safe-working pressure range of First Heat Exchanger 101.

Certainly, by-passing valve 81 is set herein, provides another operational mode, it, can when meeting certain heating needs To use second of method of operation, to extend the service life of the first expansion device 8；Or first expansion device 8 break down When, it can be with second of method of operation of Emergency use, to keep preferable heat-production functions.

In the various embodiments described above, the outlet of the second expansion device 9 and the first shut-off valve 4 can be connected to outdoor heat exchanger 3 Same header, i.e. inlet header 36.Then no matter which kind of operating mode, refrigerant flows through outdoor heat exchange with the same direction Device 3, identical flow direction ensure that refrigerant plays good thermodynamic property and dynamics always in outdoor heat exchanger 3 Performance all has good working performance to take into account under each mode.

Referring to FIG. 10, Figure 10 is a kind of specific embodiment of outdoor heat exchanger in automotive air-conditioning system provided by the present invention Structural schematic diagram.

The outdoor heat exchanger 3 has refrigerating circuit import 31 and heating circuit inlet 32 set on inlet header 36.System In hot loop, refrigerant enters outdoor heat exchanger 3 through the second expansion device 9, therefore the second expansion device 9 can be connected to and heat back Road import 32；In refrigerating circuit, the refrigerant of relatively-high temperature enters outdoor heat exchanger 3 through the outlet of the first shut-off valve 4, therefore first Shut-off valve 4 can be connected to refrigerating circuit import 31.In figure, two imports are set to the same end of inlet header 36, so that refrigerant It is not only flowed to unanimously along flat tube 38, flow direction is located at the outlet 33 of outlet collection pipe 37, and along the flow direction of inlet header 36 Unanimously.In addition, being designed as two independent imports, it is also convenient for the connection of different branch Yu outdoor heat exchanger 3.

The outdoor heat exchanger 3 specifically includes inlet header 36 and outlet collection pipe 37, is fitted in inlet header 36 Distribution pipe 34 is equipped with several flat tubes 38 disposed in parallel, sets between flat tube 38 between inlet header 36 and outlet collection pipe 37 There is the fin 39 for reinforcing heat transfer effect, fin 39 can be fixedly welded between flat tube 38.In addition, distribution pipe 34 is equipped with along it Several dispensing orifices 35 of length direction distribution, dispensing orifice 35 can be uniform after distributing towards each flat tube 38, the allocated pipe 34 of refrigerant It flows in each flat tube 38.When outdoor heat exchanger 3 is installed, the inlet header 36 for being equipped with distribution pipe 34 is preferably arranged in outlet collection Flow tube 37 directly above or obliquely above, so that refrigerant quickly flows.

At this point, heating circuit inlet 32 can be connected to distribution pipe 34, refrigerating circuit import 31 can be inserted directly into inlet header 36, refrigerating circuit import 31 is independently of distribution pipe 34.Refrigerant flow direction distribution pipe after 9 decrease temperature and pressure of the second expansion device 34, each flat tube 38 is entered after distribution, then flows out outdoor heat exchanger 3 through outlet collection pipe 37；And the system through relatively-high temperature high pressure Cryogen is then directly entered in inlet header 36, then flows out outdoor heat exchanger 3 through flat tube 38.

It is designed in this way, under refrigeration mode, the first dehumidification mode and dehumidification mode, the gaseous refrigerant of high temperature and pressure, It can be directly entered in the inlet header 36 of outdoor heat exchanger 3 through the first shut-off valve 4, since refrigerant at this time is single gas State has had preferable allocation performance, distributes without the allocated pipe 34, also there is no need to pass through dispensing orifice 35, can reduce pressure Power loss；And under other modes, by the low-temperature low-pressure refrigerant formed after 9 decrease temperature and pressure of the second expansion device, changed through outdoor The distribution pipe 34 of hot device 3 exchanges heat after distributing even into flat tube 38, and heat exchange efficiency can be improved.Therefore, the outdoor heat exchanger 3 According to two kinds of phases of the gaseous state of refrigerant and liquid, corresponding import is respectively set out, realizes the optimized design of exchange capability of heat.

It should be noted that refrigerating circuit import 31 and heating circuit inlet 32 are all set in inlet header in Figure 10 36 one end, in fact, the other positions that the two is set to inlet header 36 also can be achieved on refrigerant in each mode The purpose of co-flow, for example, the central region of inlet header 36 can be all set in.

The embodiment of work is both participated in for above-mentioned first expansion device 8 and the second expansion device 9, i.e. air-conditioning system is in Heating mode, two expansion devices can be controlled in the following manner.

Figure 11-12 is please referred to, Figure 11 is the first control principle drawing of expansion device under heating mode in Fig. 4, and dotted line shows Feedback signal out；Figure 12 is the control flow chart of two expansion devices in control figure 11.

As shown in figure 11, the outlet pressure of refrigerant, outlet temperature at the outlet 1011 of detection outflow First Heat Exchanger 101 Degree, to obtain the degree of supercooling of First Heat Exchanger 101；Detect the outlet pressure of refrigerant at the outlet 33 of outdoor heat exchanger 3, outlet Temperature, to obtain the degree of superheat of outdoor heat exchanger 3.The feedback signal of the first expansion device 8 is controlled from First Heat Exchanger 101 Degree of supercooling, control the second expansion device 9 feedback signal from outdoor heat exchanger 3 the degree of superheat.

The step of controlling the first expansion device 8 and the second expansion device 9 include the following:

S11, the degree of superheat and First Heat Exchanger that corresponding preferably outdoor heat exchanger 3 is obtained according to setting operating condition and temperature 101 degree of supercooling, specifically can be by system according to solidifying in the controls after verification experimental verification；

S12, the outlet pressure p3 and outlet temperature t3 for detecting outdoor heat exchanger 3；

S13, the practical overheat that outdoor heat exchanger 3 is obtained according to the outlet pressure p3 and outlet temperature t3 of outdoor heat exchanger 3 Degree；

The degree of superheat can be calculated according to the following equation:

Wherein, practical degree of superheat SH3=t3-ts3, ts3 are refrigerant corresponding saturation temperature in pressure p 3；

S14, compare the practical degree of superheat of outdoor heat exchanger 3 and the preset degree of superheat, if the former is greater than the latter, enter step S141 is less than, then enters step S142, is equal to, then enters step S143；

S141, increase by 9 aperture of the second expansion device；

S142, reduce 9 aperture of the second expansion device；

S143, keep the current aperture of the second expansion device 9 constant.

When specific execution step S141, S142, second can be controlled by the default and practical degree of superheat difference calculated in S14 The adjusting stepping of expansion device 9, so that the practical degree of superheat reaches the preset degree of superheat.

By step S141, S142, S143, so that after the practical degree of superheat of outdoor heat exchanger 3 reaches the preset degree of superheat, Step S15 can be continued to execute:

S15, the outlet pressure p101 and outlet temperature t101 for detecting First Heat Exchanger 101；

S16, the practical supercooling that First Heat Exchanger 101 is obtained according to the outlet pressure and outlet temperature of First Heat Exchanger 101 Degree；

Degree of supercooling can be calculated according to the following equation:

Wherein, practical degree of supercooling SC101=ts101-t101, ts101 are refrigerant corresponding saturation temperature in pressure p 101 Degree；

S17, compare the practical degree of supercooling of First Heat Exchanger 101 and preset degree of supercooling, if the former is greater than the latter, enter step Rapid S171, is less than, then enters step S172, is equal to, then enters step S173；

S171, reduce 8 aperture of the first expansion device；

S172, increase by 8 aperture of the first expansion device；

S173, keep the current aperture of the first expansion device 8 constant.

When specific execution step S171, S172, first can be controlled by the default and practical degree of supercooling difference calculated in S17 The adjusting stepping of expansion device 8, so that practical degree of supercooling reaches preset degree of supercooling.

By step S171, S172, S173, so that the practical degree of supercooling of First Heat Exchanger 101 reaches preset degree of supercooling Afterwards, it can return to step S12.

In above-mentioned control process, when systemic presupposition degree of supercooling and the degree of superheat, a tolerance can be preset, i.e. preset value is range Value.When comparing preset value and actual value, as long as difference is in the margin of tolerance, without adjusting the aperture of expansion device.Setting Tolerance, can the accidental fluctuation of anti-locking system the measurement of the degree of superheat, degree of supercooling is influenced, in order to avoid the adjusting of expansion device excessively frequency It is numerous.

The control method first adjusts the aperture of the second expansion device 9, this actually can generate centainly the first expansion device 8 It influences, then adjusts 8 aperture of the first expansion device again, jointly controlling for two expansion devices is actually realized, so that most Whole adjusted result realizes the optimized control of two expansion devices as close possible to practical adjustments demand.

Expansion device is adjusted according to the degree of superheat and degree of supercooling, combines pressure and temperature, adjusted result is the most accurate.It can be with Understand, be only also according to the control that temperature or pressure carry out expansion device it is feasible, only regulating effect is inferior to according to overheat The adjusting of degree or degree of supercooling.

The first expansion device 8 and the second expansion device 9 can also be controlled by other means.

Figure 13-14 is please referred to, Figure 13 is second of control principle drawing of expansion device under heating mode in Fig. 4, and two swollen Swollen device is electric expansion valve, and dotted line shows feedback signal in figure；Figure 14 is the control stream of two expansion devices in control figure 13 Cheng Tu.

In the control mode, degree of supercooling of the feedback signal from the second heat exchanger 102 of the first expansion device 8 is controlled, As shown in figure 13, the outlet pressure and outlet temperature at the outlet 1021 of the second heat exchanger 102 are detected, the second expansion device is controlled 9 feedback signal detects the outlet pressure at the outlet 1011 of First Heat Exchanger 101 from the degree of supercooling of First Heat Exchanger 101 Power, outlet temperature.

The step of controlling the first expansion device 8 and the second expansion device 9 is as follows:

S21, the degree of supercooling and First Heat Exchanger that corresponding preferable second heat exchanger 102 is obtained according to setting operating condition and temperature 101 degree of supercooling, specifically can be by system according to solidifying in the controls after verification experimental verification；

S22, the outlet pressure p102 and outlet temperature t102 for detecting the second heat exchanger 102；

S23, the second heat exchanger 102 is obtained according to the outlet pressure p102 and outlet temperature t102 of the second heat exchanger 102 Practical degree of supercooling；

Degree of supercooling can be calculated according to the following equation:

Wherein, practical degree of supercooling SC102=ts102-t102, ts102 are refrigerant corresponding saturation temperature in pressure p 102 Degree；

S24, compare the practical degree of supercooling of the second heat exchanger 102 and preset degree of supercooling, if the former is greater than the latter, enter step Rapid S242, is less than, then enters step S241, is equal to, then enters step S243；

S241, reduce 8 aperture of the first expansion device；

S242, increase by 8 aperture of the first expansion device；

S243, keep the current aperture of the first expansion device 8 constant.

When specific execution step S241, S242, first can be controlled by the default and practical degree of supercooling difference calculated in S24 The adjusting stepping of expansion device 8, so that practical degree of supercooling reaches preset degree of supercooling.

By step S241, S242, S243, so that the practical degree of supercooling of the second heat exchanger 102 reaches preset degree of supercooling Afterwards, step S25 can be continued to execute:

S25, the outlet pressure p101 and outlet temperature t101 for detecting First Heat Exchanger 101；

S26, First Heat Exchanger 101 is obtained according to the outlet pressure p101 and outlet temperature t101 of First Heat Exchanger 101 Practical degree of supercooling；

Degree of supercooling can be calculated according to the following equation:

S27, compare the practical degree of supercooling of First Heat Exchanger 101 and preset degree of supercooling, if the former is greater than the latter, enter step Rapid S272, is less than, then enters step S271, is equal to, then enters step S273；

S271, reduce 9 aperture of the second expansion device；

S272, increase by 9 aperture of the second expansion device；

S273, keep the current aperture of the second expansion device 9 constant.

When specific execution step S271, S272, second can be controlled by the default and practical degree of supercooling difference calculated in S27 The adjusting stepping of expansion device 9, so that practical degree of supercooling reaches preset degree of supercooling.

By step S271, S272, S273, so that the practical degree of supercooling of First Heat Exchanger 101 reaches preset degree of supercooling Afterwards, it can return to step S22.

It is identical as the first control mode, when systemic presupposition degree of supercooling and the degree of superheat, a tolerance can be preset, i.e. preset value is Value range.When comparing preset value and actual value, as long as difference is in the margin of tolerance, without adjusting the aperture of expansion device.

Since the first expansion device 8 is set between First Heat Exchanger 101 and the second heat exchanger 102, then the first expansion fills Setting 8 aperture can be adjusted according to the degree of supercooling of any heat exchanger in this two kinds；And the second expansion device 9 is set to First Heat Exchanger Between 101 and outdoor heat exchanger 3, then 9 aperture of the second expansion device opens the degree of superheat or First Heat Exchanger according to outdoor heat exchanger 3 101 degree of supercooling is adjusted.Then, in order to realize jointly controlling for two expansion devices, the first above-mentioned control mode can be taken Or second of control mode.

It should be noted that the first above-mentioned control mode, first adjusts the degree of superheat of outdoor heat exchanger 3, then adjust first The degree of supercooling of heat exchanger 101；Second of control mode, first adjusts the degree of supercooling of the second heat exchanger 102, then adjusts First Heat Exchanger 101 degree of supercooling.Why take such successively adjusting sequence, be since it is considered that in the air-conditioning system each heat exchanger it is excellent First grade relationship.Air-conditioning system in above-described embodiment, from large to small according to heat exchange amount, in heating mode, three kinds of heat exchangers pair The sequencing of the influence of heating effect are as follows: the second heat exchanger 102, outdoor heat exchanger 3, First Heat Exchanger.Therefore, when adjusting, Priority first the second heat exchanger 102 or outdoor heat exchanger 3 are first adjusted, then adjusts the posterior First Heat Exchanger 101 of priority, Adjusting efficiency can be promoted significantly, improve regulating effect.

Accordingly, it will be understood that even if not being also according to the sequence of the first above-mentioned control mode or second of control mode It is feasible.For example, can first adjust the aperture of the first expansion device 8 in the first control mode, then adjust the second expansion device 9 Aperture；In second of control mode, the aperture of the second expansion device 9 can be first adjusted, then adjusts opening for the first expansion device 8 Degree, may be implemented to jointly control purpose, only adjusts efficiency and effect is inferior to above-described embodiment.

In view of above-mentioned control mode, it will be understood that for the embodiment of by-passing valve 81 is arranged, refrigerant is through by-passing valve 81 When, without jointly controlling the first expansion device 8 and the second expansion device 9, only control the second expansion device 9, control process It is relatively easy.In addition, when the second heat exchanger 102 passes through the expansion device connection First Heat Exchanger 101 being separately provided, above-mentioned control The first expansion device 8 in mode replaces with the expansion device being separately provided, to jointly control with the second expansion device 9.

For the various embodiments described above, further improvement can also be made.

As shown in figure 15, Figure 15 is the structural representation of 4th kind of specific embodiment of automotive air-conditioning system provided by the present invention Figure.

In the embodiment, air-conditioning system specifically further includes battery case 200, when automobile uses electric power, such as electric car Or hybrid vehicle, battery case 200 can be used for the heat management to battery 300.This embodiment in addition to battery case 200 and its is led to Other than the design of road, rest part is similar with first embodiment, it will be understood that electricity can be arranged according to the present embodiment in other embodiments Pond case 200 and related pathways design, principle is identical, repeats no more.

Battery case 200 is equipped with circulating air opening 206, the second outer circulation air port 205, second circulation air door 204 in second, and sets First circulation air door 106 at air-conditioning box 100 is similar, can control second circulation air door 204 according to actual needs, and control is through the The mixing wind ratio that circulating air opening 206 and the second outer circulation air port 205 enter in two, to form required air stream E.Battery 300 can be set in battery case 200, and battery heat exchanger 201 is correspondingly arranged in battery case 200.

In addition, the air stream G after battery 300 is introduced two branches by battery case 200, one article of branch can be connected to the At two cycle throttles 204 second in circulating air opening 206, another branch be connected on the outside of compartment.The flow direction of air stream G is by interior Outer air door 405 controls.

As shown in figure 15, wind inlet channel 401, battery 300 and interior exogenous wind are equipped between battery 300 and battery heat exchanger 201 Be equipped with exhaust air flue 402 between door 405, two branches be respectively the first air duct 403 being connected to circulating air opening 206 in second and With the second air duct 404 being connected on the outside of compartment, exhaust air flue 402 and the first air duct 403, the second air duct 404 form trident access, Inside and outside air door 405 is set at fork.In Figure 15, when inside and outside air door 405 is towards right opening, the second air duct 404 is closed, the first air duct 403 open；When inside and outside air door 405 is towards left opening, the first air duct 403 is closed, and the second air duct 404 is opened.It is designed in this way, air duct Design is simplified, it will be understood that the first air duct 403 and the second air duct 404 are individually designed non-interference, and exhaust air flue 402 It is also feasible by two airdoor controls and the on-off in the first air duct 403, the second air duct 404.

It, can be in second circulation air door for the ease of air stream E through entering battery heat exchanger 201 at second circulation air door 204 Second air blower 203 is set between 204 and battery heat exchanger 201.

The outlet of communication chamber external heat exchanger 3 is capable of in the import of 201 refrigerant of battery heat exchanger, and the access of the two is equipped with third The on-off of expansion device 12, the access can be controlled by the 5th shut-off valve 11, can also when third expansion device 12 has the function of opening and closing Voluntarily to be controlled by third expansion device 12；The import of the outlet compressor 1 of battery heat exchanger 201, is generally then connected to pressure The gas-liquid separator 2 of 1 entrance of contracting machine.

Figure 16 is please referred to, Figure 16 is refrigerant flowpath schematic diagram when air-conditioning system is in refrigeration mode in Figure 15, Wherein thickened portion indicates flow path.

When refrigeration, the 5th shut-off valve 11 is opened, air-conditioning box 100, outdoor heat exchanger 3 etc. and the refrigeration mould in first embodiment Formula is consistent.Herein, it repeats no more.

The refrigerant that outdoor heat exchanger 3 flows out flows to the first expansion device 8 all the way, First Heat Exchanger 101 carries out such as first Refrigeration cycle described in embodiment；Another way flows to third expansion device 12 and is expanded, and decrease temperature and pressure is the system of low-temp low-pressure Cryogen exchanges heat into battery heat exchanger 201, absorbs air stream E heat, forms cold air stream F, and air stream F flows through battery 300 pairs its cool down, refrigerant then mutually becomes low-pressure gaseous, converges with the refrigerant flowed out from the 4th shut-off valve 7 into gas Liquid/gas separator 2 separates, and enters in compressor 1, such cycle operation.

In fact, battery heat exchanger 201 and First Heat Exchanger 101 are in and are arranged in parallel, the work of the two is not interfere with each other.It can According to system actual condition, the work of First Heat Exchanger 101 and battery heat exchanger 201 is controlled, to simultaneously be passenger compartment, battery 300 provide cold source, or are individually for passenger compartment or the offer cold source of battery 300.Such as:

When ambient temperature and interior thermic load are not very high, and 200 thermic load of battery case is higher, passenger compartment without It needs to freeze, battery case 200 needs to cool down, then can close the first expansion device 8, open the 5th shut-off valve 11, First Heat Exchanger 101 It does not work, battery heat exchanger 201 works；I.e. single battery 300 is freezed；

When ambient temperature or interior thermic load are high, and 200 thermic load of battery case is lower, then the first expansion can be opened Device 8, closing the 5th shut-off valve 11 (when third expansion device 12 has the function of opening and closing, can also close third expansion device 12)；I.e. independent passenger compartment refrigeration；

When ambient temperature or interior thermic load are higher, and 200 thermic load of battery case is higher, the first expansion device 8 And the 5th shut-off valve 11 open, as shown in figure 16, i.e., freeze simultaneously for passenger compartment and battery 300.

When refrigeration, battery case 200 can have there are two types of operating mode:

Circulation pattern in battery case 200:

When ambient temperature is higher than the leaving air temp of battery 300, the second outer circulation air port 205 is closed, and by interior Outer air door 405 disconnects the second air duct 404 and exhaust air flue 402, so that the battery lower than external environment temperature in exhaust air flue 402 300 outlet air circulating air opening 206 in the first air duct 403, second enters in battery case 200, exchanges heat at battery heat exchanger 201, To save the energy；

200 outer circulation mode of battery case:

When ambient temperature is lower than the leaving air temp of battery 300, circulating air opening 206 in second is closed, and by interior Outer air door 405 disconnects the first air duct 403 and exhaust air flue 402, and the air of extraneous lower temperature can be through the second outer circulation air port 205 Into heat exchange refrigeration is participated in battery case 200, cool down for battery 300, the air stream G after being heated by battery 300 is through exhaust air flue 402,404 row of the second air duct is outwardly in environment.

300 outer circulation mode of battery is suitable for the operating condition that ambient temperature is lower than 300 leaving air temp of battery, therefore in the mould Under formula, it can determine whether battery heat exchanger 201 needs to work on according to the temperature of battery 300.If battery 300 needs further Cooling, then the 5th shut-off valve 11 continues starting, and carries out refrigeration cycle；If battery 300 can work in suitable temperature range Interior, then the 5th shut-off valve 11 can close, and battery heat exchanger 201 does not work, and further save the energy.

Figure 17 is please referred to, Figure 17 is in refrigerant flowpath schematic diagram when heating mode for air-conditioning system in Figure 15, Wherein thickened portion indicates flow path.

When heating, battery heat exchanger 201 does not work, the 5th shut-off valve 11 close, air-conditioning box 100, outdoor heat exchanger 3 etc. with Heating mode in first embodiment is consistent.Herein, it repeats no more.

At this point, battery case 200 can have two kinds of operating modes:

300 heating mode of battery:

When ambient temperature is very low, and battery 300 needs to heat, the second electric heater 202 can be made to be powered, then through the The air stream E that two cycle throttles 204 enter can be heated through the second electric heater 202, and the air stream F after heating passes through wind inlet channel 401 are sent in battery 300, heat up to battery 300.

Inside and outside air door 405 cuts off exhaust air flue 402 and the second air duct 404, but is connected to the first air duct 403 and outlet air wind Road 402, and second circulation air door 204 cuts off the second outer circulation air port 205, then the air entered from second circulation air door 204 E is flowed all from 300 outlet air of battery, can save the energy.

300 refrigerating mode of battery:

When ambient temperature is lower, but 300 self-heating of battery needs cooling, outside air can use to battery 300 are cooled down.At this point it is possible to close circulating air opening 206 in second, external cold air through the second outer circulation air port 205 into Enter the second battery case 200, and pass through battery heat exchanger 201, the second electric heater 202 according to this, and then enters in battery 300 and carry out Natural cooling, battery heat exchanger 201 and the second electric heater 202 do not work.In addition, controlling outlet air wind by inside and outside air door 405 Road 402 is connected to the second air duct 404, and 300 outlet air of battery is through exhaust air flue 402,404 row of the second air duct to the outside on the outside of compartment In environment.

Figure 18 is please referred to, Figure 18 is when air-conditioning system is in heating mode and is in battery waste heat take-back model in Figure 15 Refrigerant flowpath schematic diagram, wherein thickened portion indicates flow path.

300 waste heat take-back model of battery:

When environment temperature is low-down, but when the fever of battery 300 itself is capable of providing enough waste heats and can utilize, 300 waste heat take-back model of battery can also be used, system heating efficiency is further increased, it is energy saving.

First shut-off valve 4, the 4th shut-off valve 7 are closed, and the second shut-off valve 5, third shut-off valve 6, the 5th shut-off valve 11 are opened. Two branches of refrigerant flow direction of the second shut-off valve 5 are flowed out, a branch flows to the first expansion device 8, implement such as first Heating circulation described in example；The high-pressure refrigerant of another branch is expanded into the refrigeration of low-temp low-pressure through third expansion device 12 Agent absorbs the heat of the relatively warm air stream formed by the fever of battery 300, is heated to be low-pressure gaseous into battery heat exchanger 201 Refrigerant, the refrigerant flowed out with third shut-off valve 6 converges, into gas-liquid separator 2, so as to improve refrigerant here Intake air temperature and improve system effectiveness, eventually enter into compressor 1, such cycle operation.

Air stream after being exchanged heat at battery heat exchanger 201 is cooled, and air stream F after cooling is through wind inlet channel 401 are sent in battery 300, cool down to battery 300, and cooling air stream is heated to be air stream G again, into outlet air wind Road 402.At this point, inside and outside air door 405 cuts off the second air duct 404, exhaust air flue 402 is connected to the first air duct 403, while also being cut off Outer circulation air door, 300 outlet air of battery are entered in the second battery case 200 by circulating air opening 206 in second, are so recycled.

300 waste heat take-back model of battery can be such that compressor 1 is vented by 300 exhaust-heat absorption of battery and by refrigerant system Temperature is opposite to be improved, and is improved the heat capacity of system, is further saved the energy.

After battery case 200 is set, the first dehumidification mode, the second dehumidification mode as in the first embodiment can be carried out And defrosting mode, details are not described herein again.

It should be noted that multiple shut-off valves have been described in detail in the various embodiments described above, realized by the opening and closing of shut-off valve The on-off of place branch, to realize the switching of multiple operating modes, stop valve structure is simple, and on-off control is reliable.It can manage Solution, those skilled in the art can also realize the formation of each mode underpass by other means, however it is not limited to above-mentioned shut-off valve Embodiment, such as two shut-off valves are substituted using three-way switch valve.For example, by taking first embodiment as an example, when being heated When mode, the refrigerant of outflow First Heat Exchanger 101 needs to flow to the branch where the second expansion device 9, and the 4th shut-off valve 7 closes It closes, for that can cancel the 4th shut-off valve 7 up to the purpose, and switching valve is directly set, it is swollen that refrigerant flow path is switched to second Branch where swollen device 9, or switch to the branch (e.g., refrigeration mode) of connection 1 import of compressor.

For another example, still by taking first embodiment as an example, the first shut-off valve 4 and the second shut-off valve can be substituted by a switching valve 5.And so on, it no longer enumerates herein.In addition the expansion device in the present invention is preferably electric expansion valve, so as to reality Now with the linkage of controller, to realize preferable control effect.

It should be noted that in the application First Heat Exchanger 101, the second heat exchanger 102, outdoor heat exchanger 3 setting side Formula so that under either mode, the import and export of each heat exchanger will not there is a situation where being not only used as import again as exporting, thus The ability of heat exchanger is set to play.

Automotive air-conditioning system provided by the present invention and its control method are described in detail above.It answers herein With a specific example illustrates the principle and implementation of the invention, the explanation of above example is only intended to help to manage Solve method and its core concept of the invention.It should be pointed out that for those skilled in the art, not departing from , can be with several improvements and modifications are made to the present invention under the premise of the principle of the invention, these improvement and modification also fall into this hair In bright scope of protection of the claims.

Claims

1. a kind of automotive air-conditioning system, including compressor (1), First Heat Exchanger (101), the first expansion device (8), the second heat exchange Device (102) and outdoor heat exchanger (3), the second expansion device (9), the compressor (1), the outdoor heat exchanger (3), institute State the first expansion device (8), the First Heat Exchanger (101) can sequential communication formed refrigerating circuit, which is characterized in that it is described Compressor (1), second heat exchanger (102), the First Heat Exchanger (101), second expansion device (9), the room External heat exchanger (3) being capable of sequential communication formation heating circuit；And in heating mode, air stream first flows through the First Heat Exchanger (101) heat exchange heating is carried out, second heat exchanger (102) is then passed through.

2. automotive air-conditioning system as described in claim 1, which is characterized in that described in the outlet of the compressor (1) The outlet of the import of two heat exchangers (102), second heat exchanger (102) is connected to the outdoor heat exchanger (3) by a branch, The import of the First Heat Exchanger (101) is connected to by another branch；Temperature damper is equipped at second heat exchanger (102) (105), the temperature damper (105) is opened when heating.

3. automotive air-conditioning system as described in claim 1, which is characterized in that the outlet of the compressor (1) passes through a branch The outdoor heat exchanger (3) are connected to, the import of second heat exchanger (102) is connected to by another branch.

4. automotive air-conditioning system as claimed in claim 2 or claim 3, which is characterized in that the outlet of second heat exchanger (102) is logical The import that first expansion device (8) is connected to the First Heat Exchanger (101) is crossed, the first expansion device (8) is electronic expansion Valve.

5. automotive air-conditioning system as claimed in claim 4, which is characterized in that first expansion device (8) is parallel with bypass Valve (81).

6. such as claim 1-3,5 described in any item automotive air-conditioning systems, which is characterized in that the outdoor heat exchanger (3) One header is equipped with refrigerating circuit import (31) and heating circuit inlet (32)；Distribution pipe (35) are equipped in the header, The heating circuit inlet (32) is directly connected to the distribution pipe (35)；The refrigerating circuit import (31) is directly connected to the collection Flow tube, the refrigerating circuit import (31) and the distribution pipe (35) Xiang Duli.

7. automotive air-conditioning system as claimed in claim 4, which is characterized in that a header of the outdoor heat exchanger (3) is set There are refrigerating circuit import (31) and heating circuit inlet (32)；Distribution pipe (35) are equipped in the header, it is described to heat back Road import (32) is directly connected to the distribution pipe (35)；The refrigerating circuit import (31) is directly connected to the header, described Refrigerating circuit import (31) and the distribution pipe (35) Xiang Duli.

8. automotive air-conditioning system as described in claim 1, which is characterized in that further include presetting the First Heat Exchanger (101) The controller of degree of supercooling, the outdoor heat exchanger (3) degree of superheat；

The controller first obtains the degree of superheat of the outdoor heat exchanger (3), and compared with the preset degree of superheat described in adjusting The aperture of second expansion device (9)；After adjusting, the controller also obtains the degree of supercooling of the First Heat Exchanger (101), and with Preset degree of supercooling compares to adjust the aperture of first expansion device (8)；

Or, the controller first obtains the degree of supercooling of the First Heat Exchanger (101), and to adjust compared with preset degree of supercooling The aperture of first expansion device (8)；After adjusting, the controller also obtains the degree of superheat of the outdoor heat exchanger (3), and The aperture of second expansion device (9) is adjusted compared with the preset degree of superheat.

9. automotive air-conditioning system as described in claim 1, which is characterized in that further include presetting the First Heat Exchanger (101) The controller of degree of supercooling, second heat exchanger (102) degree of supercooling；

The controller first obtains the degree of supercooling of second heat exchanger (102), and to adjust compared with preset degree of supercooling State the aperture of the first expansion device (8)；After adjusting, the controller also obtains the degree of supercooling of the First Heat Exchanger (101), and The aperture of second expansion device (9) is adjusted compared with preset degree of supercooling；

Or, the controller obtains the degree of supercooling of the First Heat Exchanger (101), and to adjust compared with preset degree of supercooling State the aperture of the second expansion device (9)；After adjusting, the controller also obtains the degree of supercooling of second heat exchanger (102), and The aperture of first expansion device (8) is adjusted compared with preset degree of supercooling.

10. such as the described in any item automotive air-conditioning systems of claim 1-3,7-8, which is characterized in that further include battery (300), Battery heat exchanger (201) and third expansion device (12) in communication, the import of the third expansion device (12) can connect Lead to the outlet of the outdoor heat exchanger (3) and the outlet of second heat exchanger (102)；The battery heat exchanger (201) The import of compressor described in outlet (1).

11. automotive air-conditioning system as claimed in claim 10, which is characterized in that including accommodating the battery (300), the electricity The battery case (200) of pond heat exchanger (201)；The air inlet of the battery case (200) is equipped with and the interior circulation that is connected in car room Air port, with the outer circulation air port that is connected to outside compartment, and in adjusting circulating air opening and outer circulation air port cycle throttle.

12. automotive air-conditioning system as claimed in claim 11, which is characterized in that be additionally provided with the first air duct (403) and the second wind Road (404), and air outlet and first air duct (403), second air duct (404) of the control battery case (200) The inside and outside air door (405) of on-off；First air duct (403) is connected to the interior circulating air opening, the second air duct (404) connection Outside compartment.

13. automotive air-conditioning system as claimed in claim 6, which is characterized in that further include battery (300), battery heat exchanger (201) and third expansion device (12) in communication, the import of the third expansion device (12) can be connected to the outdoor The outlet of heat exchanger (3) and the outlet of second heat exchanger (102)；The outlet institute of the battery heat exchanger (201) State the import of compressor (1).

14. automotive air-conditioning system as claimed in claim 13, which is characterized in that including accommodating the battery (300), the electricity The battery case (200) of pond heat exchanger (201)；The air inlet of the battery case (200) is equipped with and the interior circulation that is connected in car room Air port, with the outer circulation air port that is connected to outside compartment, and in adjusting circulating air opening and outer circulation air port cycle throttle.

15. a kind of control method of automotive air-conditioning system as claimed in claim 4, which is characterized in that include the following steps:

The degree of superheat of corresponding outdoor heat exchanger (3) and the supercooling of First Heat Exchanger (101) are obtained according to setting operating condition and temperature Degree；

By detecting the outlet pressure of outdoor heat exchanger (3), the practical degree of superheat of outlet temperature acquisition outdoor heat exchanger (3), lead to Cross the outlet pressure of detection First Heat Exchanger (101), the practical degree of supercooling of outlet temperature acquisition First Heat Exchanger (101)；

Carry out aperture regulation, wherein the second expansion device (9) is heating power expansion valve or electric expansion valve:

First compare the practical degree of superheat of outdoor heat exchanger (3) and the preset degree of superheat, if the former is greater than the latter, increases by the second expansion Device (9) aperture；The former is less than the latter, reduces the second expansion device (9) aperture；The former is equal to the latter, then keeps the second expansion The current aperture of device (9) is constant；

Compare the practical degree of supercooling of First Heat Exchanger (101) and preset degree of supercooling again, if the former is greater than the latter, it is swollen to reduce first Swollen device (8) aperture；The former is less than the latter, increases the first expansion device (8) aperture；The former is equal to the latter, keeps the first expansion The current aperture of device (8) is constant；

Or, first compare the practical degree of supercooling of First Heat Exchanger (101) and preset degree of supercooling, if the former is greater than the latter, reduce the One expansion device (8) aperture；The former is less than the latter, then increases the first expansion device (8) aperture；The former is equal to the latter, then keeps The current aperture of first expansion device (8) is constant；

Compare the practical degree of superheat of outdoor heat exchanger (3) and the preset degree of superheat again, if the former is greater than the latter, increases by the second expansion Device (9) aperture；The former is less than the latter, then reduces the second expansion device (9) aperture；The former is equal to the latter, keeps the second expansion The current aperture of device (9) is constant.

16. a kind of control method of automotive air-conditioning system as claimed in claim 4, which is characterized in that include the following steps:

The degree of supercooling of corresponding second heat exchanger (102) and the supercooling of First Heat Exchanger (101) are obtained according to setting operating condition and temperature Degree；

By detecting the outlet pressure of the second heat exchanger (102), the practical supercooling of outlet temperature acquisition the second heat exchanger (102) Degree, by detecting the outlet pressure of First Heat Exchanger (101), the practical degree of supercooling of outlet temperature acquisition First Heat Exchanger (101)；

Carry out aperture regulation, wherein the second expansion device (9) is electric expansion valve:

First compare the practical degree of supercooling of the second heat exchanger (102) and preset degree of supercooling, if the former is greater than the latter, it is swollen to increase by first Swollen device (8) aperture；The former is less than the latter, reduces the first expansion device (8) aperture；The former is equal to the latter, then holding first is swollen The current aperture of swollen device (8) is constant；

Compare the practical degree of supercooling of First Heat Exchanger (101) and preset degree of supercooling again, if the former is greater than the latter, it is swollen to increase by second Swollen device (9) aperture；The former is less than the latter, reduces the second expansion device (9) aperture；The former is equal to the latter, keeps the second expansion The current aperture of device (9) is constant；

Or, first compare the practical degree of supercooling of First Heat Exchanger (101) and preset degree of supercooling, if the former is greater than the latter, increase by the Two expansion devices (9) aperture；The former is less than the latter, then reduces the second expansion device (9) aperture；The former is equal to the latter, then keeps The current aperture of second expansion device (9) is constant；

Compare the practical degree of supercooling of the second heat exchanger (102) and preset degree of supercooling again, if the former is greater than the latter, it is swollen to increase by first Swollen device (8) aperture；The former is less than the latter, then reduces the first expansion device (8) aperture；The former is equal to the latter, and holding first is swollen The current aperture of swollen device (8) is constant.