CN106904058A - Control method for electronic expansion valve and device in heat pump type air conditioning system - Google Patents
Control method for electronic expansion valve and device in heat pump type air conditioning system Download PDFInfo
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- CN106904058A CN106904058A CN201710142531.8A CN201710142531A CN106904058A CN 106904058 A CN106904058 A CN 106904058A CN 201710142531 A CN201710142531 A CN 201710142531A CN 106904058 A CN106904058 A CN 106904058A
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- Prior art keywords
- expansion valve
- degree
- superheat
- electronic expansion
- valve
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00485—Valves for air-conditioning devices, e.g. thermostatic valves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/32—Cooling devices
- B60H1/3204—Cooling devices using compression
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/193—Pressures of the compressor
- F25B2700/1933—Suction pressures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2103—Temperatures near a heat exchanger
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The present invention relates to air conditioner controlling technology field, and in particular to control method for electronic expansion valve and device in a kind of heat pump type air conditioning system, the method include：Motor compressor air-breathing end pressure is obtained with in-car heat exchanger outlet temperature；By the motor compressor air-breathing end pressure and the in-car heat exchanger outlet temperature, the actual degree of superheat is calculated；What acquisition air-conditioning panel sent heats or refrigerating state, and is heated or refrigerating state setting target superheat degree according to described；The actual degree of superheat is made the difference with the target superheat degree and obtains degree of superheat deviation；According to the degree of superheat deviation, Current electronic expansion valve opening is determined, and the electronic expansion valve opening is sent to electric expansion valve, to control the work of the electric expansion valve.By the present invention, the control accuracy and stability of heat pump type air conditioning system are improved.
Description
Technical field
The present invention relates to air conditioner controlling technology field, and in particular to electronic expansion valve controls side in a kind of heat pump type air conditioning system
Method and device.
Background technology
In order to meet the comfortableness of client and the demand of vehicle defroster demisting, overwhelming majority automobile is all configured with air-conditioning at present
System.Air-conditioning system is made up of refrigeration system and heating system.Conventional fuel oil car uses engine as power source, and refrigeration is used
12V compressors of air conditioner on engine realize that heating is realized using the waste heat of engine-cooling system.And pure electric vehicle is not due to having
There is engine, only use motor as power source, therefore its air-conditioning system belongs to a kind of electric air-conditioning system, i.e., refrigeration is adopted
It is that a motor compressor for independent 320V high pressures realizes that heating uses one to be independently arranged in air-conditioner host
320V high pressures PTC heating realize.
General more than the power 2.5kW of motor compressor of pure electric automobile, COP values, i.e. refrigerating efficiency 1.8 or so；PTC mono-
As power 2.5kW-3.5kW, COP value be less than 1, about 0.9 or so.Compare refrigeration, low many of heating system efficiency.Hot ring
Pure electric vehicle is used under border, motor compressor is such as opened and is realized refrigerating function, vehicle continual mileage about declines 15%-20%；And
Pure electric vehicle is used under cold environment, PTC is such as opened and is realized heating function, because its energy consumption is bigger, efficiency is lower, then can cause
Vehicle continual mileage declines up to more than 30%.Therefore, the heat pump type air conditioning system of exploitation more efficient energy-saving has turned into pure electronic vapour
The development trend of car, international vehicle enterprise such as Nissan, BMW, modern times, tesla etc., has begun on pure electric automobile product
Using heat pump type air conditioning system.
Heat pump type air conditioning system is main by car external heat exchanger 1 ', four-way reversing valve 2 ', the heating 3 ', air-conditioner host 4 ' of PTC auxiliary,
In-car heat exchanger 5 ', air blower 6 ', electric expansion valve 7 ', motor compressor 8 ', heat pump controller 9 ' are constituted, wherein in order to strong
Change less than -10 DEG C of refrigerant latitudes heating effect, part heat pump type air conditioning system configuration PTC assisted heating devices 3 ' work as temperature
During less than -10 DEG C, PTC assisted heating devices 3 ' are also in work while in-car heat exchanger 5 ' works.Heat pump type air conditioning system pipeline
Interior flowing is refrigerant, is currently mainly used R134a type refrigerants.The work of heat pump type air conditioning system is controlled by heat pump controller 9 '
And in heat pump type air conditioning system freezes or heat pump controller 9 ' can control air blower 6 ' to be constantly in work when heating.
Heat pump type air conditioning system composition structure is as shown in Figure 1.
Heat pump type air conditioning system refrigeration specific workflow be:Be compressed into for the gaseous coolant of high-temperature low-pressure by motor compressor 8 '
The liquid of HTHP, the switching refrigerant of four-way reversing valve 2 ' is flowed to car external heat exchanger 1 ', outer between air and refrigerant through car
Heat exchange, refrigerant liquid of the cooling as cryogenic high pressure, flows through electric expansion valve 7 ', and refrigerant is expanded to the liquid pearl of low-temp low-pressure simultaneously
Promoted in the in-car heat exchanger 5 ' for flowing into air-conditioner host 4 '；Refrigerant and in-car gas heat exchange, in-car gas temperature declines, cold
Matchmaker is converted into the gas of high-temperature low-pressure, then flows to motor compressor through four-way reversing valve 2 '.Constantly circulation, adjusts car in this way
Interior temperature is in the range of cool and comfortable.Process is operated above to be controlled by heat pump controller 9 ' in Fig. 1.
Heat pump type air conditioning system heating specific workflow is:Be compressed into for the gaseous coolant of high-temperature low-pressure by motor compressor 8 '
The liquid of HTHP, the switching refrigerant of four-way reversing valve 2 ' is flowed to in-car heat exchanger 5 ', through between in-car air and refrigerant
Heat exchange, in-car gas temperature is raised, refrigerant liquid of the cooling as cryogenic high pressure, flows through electric expansion valve 7 ', refrigerant expansion
For low-temp low-pressure liquid pearl and flowed into car external heat exchanger 1 ' by promoting；Refrigerant is exchanged with the outer air heat of car, and refrigerant is absorbed outside car
The heat of gas, is converted into the gas of high-temperature low-pressure, then flow to motor compressor through four-way reversing valve 2 '.Constantly follow in this way
Ring, regulation vehicle interior temperature is in the range of snugness.The four-way reversing valve 2 ', the electric expansion valve 7 ' and the electricity
The operation of dynamic compressor 8 ' is controlled by heat pump controller 9 '.
As can be seen that electric expansion valve is one of heat pump type air conditioning system core component from above-mentioned principle analysis, it is integrated with
The function of magnetic valve and expansion valve, on the one hand can be with the controlled switching function for realizing electromagnetic valve switch, on the other hand can be with controlled
Adjustment valve body aperture realizes the function of expansion valve regulating flow.Electric expansion valve must possess two-way admittance and expansion function, and
Expansion aperture must be adjusted accurately, rapidly, be changed rapidly with meeting heat pump air conditioner flow, the requirement of quick regulation vehicle interior temperature.
In the prior art, electronic expansion valve controls typically obtain motor compressor by heat pump controller in heat pump type air conditioning system
Pressure simultaneously directly obtains the aperture of electric expansion valve using look-up table, ultimately forms aperture control table, but once generates aperture control
Tabulation, regulation is relatively simpler, but is not easily controlled fine, bad adaptability；And the heat pump type air conditioning system of reality is often with very strong
Non-linear, time variation and hysteresis quality, therefore, in the prior art, the table look-at method of electric expansion valve do not possess it is adaptive should be able to
Power.
The content of the invention
The invention provides control method for electronic expansion valve and device in a kind of heat pump type air conditioning system, to improve heat pump air conditioner
The control accuracy and stability of system, and save system energy consumption.
To achieve these goals, the invention provides following technical scheme：
Control method for electronic expansion valve in a kind of heat pump type air conditioning system, is applied to pure electric automobile, including：
Motor compressor air-breathing end pressure is obtained with in-car heat exchanger outlet temperature；
By the motor compressor air-breathing end pressure and the in-car heat exchanger outlet temperature, actual overheat is calculated
Degree；
What acquisition air-conditioning panel sent heats or refrigerating state, and is heated or refrigerating state setting target superheat according to described
Degree；
The actual degree of superheat is made the difference with the target superheat degree and obtains degree of superheat deviation；
According to the degree of superheat deviation, Current electronic expansion valve opening is determined, and the electronic expansion valve opening is sent
Electron expansion valve, to control the work of the electric expansion valve.
Preferably, the electric expansion valve includes：In valve body controller and the valve electrically connected with the valve body controller
Stepper motor, methods described also includes：
The valve body controller obtains the electronic expansion valve opening, and is calculated valve by the electronic expansion valve opening
The target operation step number of interior stepper motor, is then sent to stepper motor in valve by the target operation step number, described to control
The work of stepper motor in valve.
Preferably, methods described also includes：
The valve body controller obtains the operation step number of stepper motor in the valve by Hall sensor；
According to the operation step number, determine electronic expansion valve regulation whether failure.
Preferably, it is described by the motor compressor air-breathing end pressure and the in-car heat exchanger outlet temperature, calculate
Include to the actual degree of superheat：
By the motor compressor air-breathing end pressure that obtains motor compressor suction end temperature is obtained by tabling look-up；
The motor compressor suction end temperature is made the difference with the in-car heat exchanger outlet temperature, the actual mistake is obtained
Temperature.
Preferably, it is described according to the degree of superheat deviation, determine that Current electronic expansion valve opening includes：
Target regulation aperture is calculated by PID using the thermal deviation of crossing；
Last moment electronic expansion valve opening is adjusted into aperture sum as Current electronic expansion valve opening with the target.
Preferably, methods described also includes：
Obtain car external environment temperature；
In refrigerating state, motor compressor is controlled with the degree of superheat deviation according to the in-car heat exchanger outlet temperature
Rotating speed；
When state is heated, the motor compressor is controlled to turn according to the car external environment temperature and the degree of superheat deviation
Speed.
Control device for electronic expansion valve in a kind of heat pump type air conditioning system, is applied to pure electric automobile, the heat pump air conditioner system
System includes：Car external heat exchanger, four-way reversing valve, motor compressor, in-car heat exchanger, heat pump controller；The four-way reversing valve
It is connected with the car external heat exchanger, the motor compressor and the in-car heat exchanger respectively by pipeline；The control dress
Put including：Pressure sensor, the first temperature sensor and it is connected between the in-car heat exchanger and the car external heat exchanger
Electric expansion valve；The heat pump controller respectively with air-conditioning panel, the pressure sensor, first temperature sensor,
The electric expansion valve, the four-way reversing valve and the electric compressor mechatronics；The pressure sensor is arranged on institute
Motor compressor suction end is stated, for gathering motor compressor air-breathing end pressure；First temperature sensor is arranged on described
At in-car heat exchanger exit, for heat exchanger outlet temperature in collecting vehicle；The heat pump controller is inhaled by the motor compressor
Gas end pressure is calculated the actual degree of superheat with the in-car heat exchanger outlet temperature, and what acquisition air-conditioning panel sent heating or making
Cold state, and heated or refrigerating state setting target superheat degree according to described, by the actual degree of superheat and the target superheat
Degree is made the difference and obtains degree of superheat deviation, and Current electronic expansion valve opening is determined according to the degree of superheat deviation, and the electronics is swollen
Swollen valve opening is sent to the electric expansion valve, to control the work of the electric expansion valve.
Preferably, the electric expansion valve includes：In valve body controller and the valve electrically connected with the valve body controller
Stepper motor；The valve body controller obtains the electronic expansion valve opening, and is calculated by the electronic expansion valve opening
The target operation step number is sent to stepping electricity in valve by the target operation step number of stepper motor in valve, the valve body controller
Machine, to control the work of stepper motor in the valve；
The electric expansion valve also includes：It is connected to the Hall between stepper motor and the valve body controller in the valve
Sensor；The Hall sensor is used to gather the operation step number of stepper motor in the valve；The valve body controller obtains institute
State the operation step number of stepper motor in valve, and according to the operation step number, determine electronic expansion valve regulation whether failure.
Preferably, the heat pump controller is getting the motor compressor air-breathing end pressure with the in-car heat exchanger
After outlet temperature, motor compressor suction end temperature is obtained by tabling look-up by the motor compressor air-breathing end pressure that obtains, and
The motor compressor suction end temperature is made the difference with the in-car heat exchanger outlet temperature and obtains the actual degree of superheat.
Preferably, the heat pump controller is calculated using the thermal deviation of crossing after degree of superheat deviation is obtained by PID
Aperture is adjusted to target, and last moment electronic expansion valve opening is swollen as Current electronic with target regulation aperture sum
Swollen valve opening.
Preferably, described device also includes：
Installed in the outer second temperature sensor electrically connected with the heat pump controller of car, the second temperature sensor
For collecting vehicle external environment temperature；
The heat pump controller in refrigerating state, according to the in-car heat exchanger outlet temperature and the degree of superheat deviation
Control motor compressor rotating speed；
The heat pump controller controls institute according to the car external environment temperature when state is heated with the degree of superheat deviation
State motor compressor rotating speed.
The beneficial effects of the present invention are：
Control method for electronic expansion valve and device in the heat pump type air conditioning system that the present invention is provided, heat pump controller obtain electronic
Compressor air suction end pressure and in-car heat exchanger outlet temperature, by the motor compressor air-breathing end pressure and the electric compressor
Machine suction end temperature computation obtains the actual degree of superheat, and what acquisition air-conditioning panel sent heats or refrigerating state；Heated according to described
Or refrigerating state sets target superheat degree；The actual degree of superheat is made the difference with the target superheat degree, degree of superheat deviation is obtained；
According to the degree of superheat deviation, Current electronic expansion valve opening is determined, and it is swollen that the electronic expansion valve opening is sent into electron
Swollen valve, to control the work of the electric expansion valve.By the present invention, the control accuracy and stabilization of heat pump type air conditioning system are improve
Property, and reduce system energy consumption.
Brief description of the drawings
Fig. 1 is the structural representation of heat pump type air conditioning system in the prior art.
Fig. 2 is a kind of flow chart of control method for electronic expansion valve in embodiment of the present invention heat pump type air conditioning system.
Fig. 3 is another flow chart of control method for electronic expansion valve in embodiment of the present invention heat pump type air conditioning system.
Fig. 4 is opening curve figure in the embodiment of the present invention.
Marked in accompanying drawing：
1 ', car external heat exchanger 2 ', four-way reversing valve 3 ', the heating 4 ', air-conditioner host 5 ' of PTC auxiliary, in-car heat exchanger
6 ', air blower 7 ', electric expansion valve 8 ', motor compressor 9 ', heat pump controller
Specific embodiment
In order that those skilled in the art can be further understood that feature of the invention and technology contents, below in conjunction with the accompanying drawings
The embodiment of the present invention is elaborated with implementation method.
It is as shown in Figure 2 a kind of flow chart of control method for electronic expansion valve in embodiment of the present invention heat pump type air conditioning system,
Comprise the following steps：
Step 100：Start.
Step 101：Motor compressor air-breathing end pressure is obtained with in-car heat exchanger outlet temperature.
It should be noted that because suitable for heat pump type air conditioning system, heat pump type air conditioning system is directed to pure electric automobile, because
This method provided in an embodiment of the present invention is applied to pure electric automobile.
Further, motor compressor air-breathing end pressure can be by the pressure sensing installed in the motor compressor suction end
Device is collected；In-car heat exchanger outlet temperature can be by the first temperature sensor installed in the in-car heat exchanger exit
Collect.
Embodiment of the present invention control is mainly by heat pump controller according to motor compressor air-breathing end pressure and in-car heat exchanger
What outlet temperature and Air-Conditioning Control Panel sent heats or refrigerating state calculating electronic expansion valve opening, and the electronics is swollen
Swollen valve opening is sent to control of the valve body controller realization to valve stepper motor in electric expansion valve；The electric expansion valve bag
Include：Stepper motor in valve body controller and the valve electrically connected with the valve body controller.
Step 102：By the in-car heat exchanger outlet temperature and the motor compressor suction end temperature, reality is calculated
The border degree of superheat.
Specifically, it is described by the motor compressor air-breathing end pressure and the in-car heat exchanger outlet temperature, calculate
Include to the actual degree of superheat：
By the motor compressor air-breathing end pressure that obtains motor compressor suction end temperature is obtained by tabling look-up；Will be described
Motor compressor suction end temperature makes the difference with the in-car heat exchanger outlet temperature, obtains the actual degree of superheat.
It should be noted that in the embodiment of the present invention, the form tabled look-up is saturation temperature pressure gauge, saturation temperature pressure gauge
Represent：The corresponding pressure value P (MPa) under saturation temperature T (DEG C), heat pump controller according to circulation in heat pump type air conditioning system not
Same refrigerant obtains different saturation temperature pressure gauges；Such as, when in heat pump type air conditioning system circulate be R134a refrigerants when, then
Saturation temperature pressure gauge is as shown in table 1.Certainly, circulation can also be such as other refrigerants of CO2 in the refrigerant of heat pump type air conditioning system.
Table 1
Step 103：What acquisition air-conditioning panel sent heats or refrigerating state.
It should be noted that air-conditioning panel is operating personnel's input unit, the air-conditioning panel top has control heat pump
The control button of air-conditioning system, such as, refrigeration key, heat key；Heat pump controller determines to work as according to the button of the air-conditioning panel
Operation of the preceding operating personnel to control system for heat pump.
Step 104：Heated or refrigerating state setting target superheat degree according to described.
Specifically, when in refrigerating state, target superheat temperature can be set for first object temperature, first mesh
Mark temperature can determine that such as, first object temperature is 5 DEG C according to the hardware performance of heat pump type air conditioning system；When in heating shape
During state, target superheat temperature can be set for the second target temperature, second target temperature can be according to heat pump type air conditioning system
Hardware performance determine, such as, and the second target temperature be 10 DEG C.
Step 105：The actual degree of superheat is made the difference with the target superheat degree and obtains degree of superheat deviation.
Step 106：According to the degree of superheat deviation, Current electronic expansion valve opening is determined, and by the electric expansion valve
Aperture is sent to electric expansion valve, to control the work of electric expansion valve.Specifically, it is described according to the degree of superheat deviation, really
Settled preceding electronic expansion valve opening includes：
Target regulation aperture CTS is calculated by PID using the thermal deviation e that crosses；By last moment electric expansion valve
Aperture Kn-1Aperture CTS sums are adjusted as Current electronic expansion valve opening K with the targetn, i.e. Kn=CTS+Kn-1；n≥0.
It is described that target regulation aperture CTS is calculated by PID by the thermal deviation e that crosses；Specifically, including：CTS=An
+Bn+Cn；An=P*e；Bn=I*e+Bn-1；Cn=D*e/ (tn-tn-1)；n≥1；Wherein, P, I, D are regulation parameters, they be according to
Demarcated according to development Experiences such as the factors such as stabilization time, response speed, static error and determined, such as, P is that 0.48, I is that 0.12, D is
0.01.Further, as CTS ＞ 0, represent that the aperture of electric expansion valve is tuned up；As CTS ＜ 0, opening for electric expansion valve is represented
Degree is turned down；It is closed when electric expansion valve is initial, i.e. CTS=0, i.e. A0=0, B0=0, C0=0.
Step 107：Exit.
Control method for electronic expansion valve in heat pump type air conditioning system provided in an embodiment of the present invention, according to motor compressor air-breathing
End pressure and in-car heat exchanger outlet temperature, are calculated the actual degree of superheat；The refrigeration that is sent according to air-conditioning panel heats shape
State, sets target superheat degree；The actual degree of superheat is excessively made the difference with the target and obtains degree of superheat deviation, so as to according to institute
State degree of superheat deviation to be calculated electronic expansion valve opening and the electronic expansion valve opening is sent into electric expansion valve, to control
The work of device electric expansion valve processed.By the present invention, the flow of heat pump type air conditioning system refrigerant is set directly to meet compressor
The matching demand of power, can saving energy consumption；Make heat pump type air conditioning system that there is quick-reaction capability, make electric expansion valve very short
It is rapid close to target control value in time；Improve the control accuracy and stability of heat pump type air conditioning system.
Further, in order to heat pump type air conditioning system operation is relatively reliable, can also be by hall sensing in the embodiment of the present invention
Device is monitored to the working condition of stepper motor in valve, with determine electronic expansion valve regulation whether failure.
Specifically, it is as shown in Figure 3 the another of control method for electronic expansion valve in embodiment of the present invention heat pump type air conditioning system
Flow chart is planted, is comprised the following steps：
Step 200：Start.
Step 201：Motor compressor air-breathing end pressure is obtained with in-car heat exchanger outlet temperature.
Step 202：By the in-car heat exchanger outlet temperature and the motor compressor suction end temperature, reality is calculated
The border degree of superheat.
Step 203：What acquisition air-conditioning panel sent heats or refrigerating state.
Step 204：Heated or refrigerating state setting target superheat degree according to described.
Step 205：The actual degree of superheat is made the difference with the target superheat degree and obtains degree of superheat deviation.
Step 206：According to the degree of superheat deviation, Current electronic expansion valve opening is determined, and by the electric expansion valve
Aperture is sent to valve body controller.
Specifically, the electric expansion valve includes：In valve body controller and the valve electrically connected with the valve body controller
Stepper motor.
Step 207：Valve body controller obtains the electronic expansion valve opening and is calculated by the electronic expansion valve opening
The target operation step number of stepper motor in valve.
Specifically, the valve body controller is calculated the target work of stepper motor in valve by the electronic expansion valve opening
Include as step number：
The electronic expansion valve opening is substituted into opening curve equation, by the target work for being calculated stepper motor in valve
Make step number；
The opening curve figure of the embodiment of the present invention is illustrated in figure 4, the opening curve equation obtained by opening curve figure is：
Kn=K0*(Fn-F0)；n≥0；Wherein, KnRepresent Current electronic expansion valve opening；FnRepresent the target operation of stepper motor in valve
Step number；F0Represent the initial step number of stepper motor action；K0Aperture coefficient is expressed as, is setting value.
It should be noted that F0、K0Determined by demarcating by according to the electric expansion valve of different model, such as F0It is 32, K0
It is 0.223, and Fn >=32.
Step 208：The target operation step number is sent to stepper motor in valve by valve body controller, to control in the valve
The work of stepper motor.
Step 209：Valve body controller obtains the operation step number of stepper motor in the valve by Hall sensor, according to institute
State operation step number, determine electronic expansion valve regulation whether failure.
It should be noted that in the embodiment of the present invention, Hall sensor is increased in electric expansion valve, can detect in valve
Stepper motor revolution, stepper motor often runs a step in valve, and the Hall sensor then remembers an operation step number, and this is run
Step number reports the valve body controller；The valve body controller determines that electronic expansion valve regulation is according to the operation step number
No failure.Such as, valve body controller detects the step number of the stepper motor in setting time internal valve and does not change, or setting
Stepper motor does not work to expected step number in time internal valve, then valve body controller judges that stepper motor failure i.e. electronics is swollen in valve
Swollen valve regulation failure.Setting time can be determined that such as setting time is 5s by different electric expansion valves by demarcating.
Step 210：Exit.
Control method for electronic expansion valve in heat pump type air conditioning system provided in an embodiment of the present invention, increases inside electric expansion valve
Plus Hall sensor, by the operation step number of stepper motor in the Hall sensor real-time monitoring valve, according to the operation step
Number, determine electric expansion valve whether failure, so as to further ensure heat pump type air conditioning system reliability of operation.
Further, control method for electronic expansion valve in the heat pump type air conditioning system that the present invention is provided, heat pump controller is in control
When electric expansion valve works, further can also be realized to the accurate control of heat pump type air conditioning system by adjusting motor compressor rotating speed
System.Specifically, in the embodiment of the present invention heat pump type air conditioning system control method for electronic expansion valve the third flow chart, it is including following
Step：
Step 300：Start.
Step 301：Motor compressor air-breathing end pressure, car external environment temperature are obtained with in-car heat exchanger outlet temperature.
It should be noted that car external environment temperature can be collected by the second temperature sensor outside car.Heat
Pump controller obtains car external environment temperature from the second temperature sensor.
Step 302：By the in-car heat exchanger outlet temperature and the motor compressor suction end temperature, reality is calculated
The border degree of superheat.
Step 303：What acquisition air-conditioning panel sent heats or refrigerating state.
Step 304：Heated or refrigerating state setting target superheat degree according to described.
Step 305：The actual degree of superheat is made the difference with the target superheat degree and obtains degree of superheat deviation.
Step 306：According to the degree of superheat deviation, Current electronic expansion valve opening is determined, and by the electric expansion valve
Aperture is sent to electric expansion valve, to control the work of the electric expansion valve.
Step 307：In refrigerating state, electricity is controlled with the degree of superheat deviation according to the in-car heat exchanger outlet temperature
Dynamic compressor rotary speed.
Specifically, in refrigerating state, whether the in-car heat exchanger outlet temperature of detection is more than zero；If it is, according to institute
Degree of superheat deviation is stated to tachometer value described in the motor compressor；Otherwise, it is the first rotating speed to control the motor compressor rotating speed
Value.It should be noted that first tachometer value is determined by the fundamental characteristics of motor compressor, such as, the first tachometer value is
1000rpm。
Further, in refrigerating state, the tachometer value bag according to the degree of superheat deviation e to the motor compressor
Include：If the degree of superheat deviation e is more than the first temperature value or less than second temperature value, wherein the first temperature value is more than the second temperature
Angle value, the then rotating speed for controlling the motor compressor is the first initial speed N01+ rotating speed coefficient z* degree of superheat deviations e；If institute
Degree of superheat deviation e is stated more than or equal to second temperature value and less than or equal to the first temperature value, then controls turning for the motor compressor
Speed is the first initial speed N01。
It should be noted that the first temperature value, second temperature value, the first initial speed N01And rotating speed coefficient z is according to heat pump
The hardware configuration of control system determines that such as the first temperature value is 2 DEG C, and second temperature value is -2 DEG C, and first is initial by demarcating
Rotating speed N01It is 3000rpm, rotating speed coefficient z is 300rpm/ DEG C.
Step 308：When state is heated, controlled according to the car external environment temperature and the degree of superheat deviation described electronic
Compressor rotary speed.
Specifically, when state is heated, whether detection car external environment temperature is in the range of the first temperature range；If it is,
The then tachometer value according to the degree of superheat deviation to the motor compressor；Otherwise, the motor compressor rotating speed is controlled to be
0.It should be noted that the first temperature range is the temperature range that heat pump type air conditioning system can be heated, such as, and the first temperature range
It is (- 10 DEG C, 20 DEG C)；When car external environment temperature is more than 20 DEG C, it is necessary to close heat pump type air conditioning system；When car external environment temperature is small
, it is necessary to PTC or heating system are heated when -10 DEG C.
Further, when state is heated, the tachometer value according to the degree of superheat deviation to the motor compressor includes：
If the degree of superheat deviation e is more than the first temperature value or less than second temperature value, wherein the first temperature value is more than second temperature
Value, the then rotating speed for controlling the motor compressor is the second initial speed N02+ rotating speed coefficient z* degree of superheat deviations e；If described
Degree of superheat deviation e then controls the rotating speed of the motor compressor more than or equal to second temperature value and less than or equal to the first temperature value
It is the first initial speed N02。
It should be noted that the first temperature value, second temperature value, the second initial speed N01And rotating speed coefficient z is according to heat pump
The hardware configuration of control system determines that such as the first temperature value is 2 DEG C, and second temperature value is -2 DEG C, and second is initial by demarcating
Rotating speed N02It is 5000rpm, rotating speed coefficient z is 300rpm/ DEG C.
Control method for electronic expansion valve in heat pump type air conditioning system provided in an embodiment of the present invention, opens to electric expansion valve
On the basis of degree is controlled, according to car external environment temperature, interior heat exchanger outlet temperature and degree of superheat deviation to electric compressor
Machine rotating speed is accurately controlled, and so as to further increase the control accuracy and stability of heat pump type air conditioning system, and is reduced
System energy consumption.
Correspondingly, the embodiment of the present invention additionally provides control device for electronic expansion valve in a kind of heat pump type air conditioning system, described
Device is applied to pure electric automobile, and the heat pump type air conditioning system includes：Car external heat exchanger, four-way reversing valve, motor compressor, car
Interior heat exchanger, heat pump controller；The four-way reversing valve by pipeline respectively with the car external heat exchanger, the motor compressor
And the in-car heat exchanger connection；Described device includes：Pressure sensor, the first temperature sensor and it is connected to the car
Electric expansion valve between interior heat exchanger and the car external heat exchanger；The heat pump controller respectively with air-conditioning panel, the pressure
Force snesor, first temperature sensor, the electric expansion valve, the four-way reversing valve and the electric compressor are electromechanical
Connection；The pressure sensor is arranged on the motor compressor suction end, for gathering motor compressor air-breathing end pressure；Institute
The first temperature sensor is stated at the in-car heat exchanger exit, for heat exchanger outlet temperature in collecting vehicle；The heat
Pump controller is calculated the actual degree of superheat by the motor compressor air-breathing end pressure with the in-car heat exchanger outlet temperature,
What acquisition air-conditioning panel sent heats or refrigerating state, and is heated or refrigerating state setting target superheat degree according to described, by institute
State the actual degree of superheat and made the difference with the target superheat degree and obtain degree of superheat deviation, Current electronic is determined according to the degree of superheat deviation
Expansion valve opening, and the electronic expansion valve opening is sent to the electric expansion valve to control the work of the electric expansion valve
Make.
It should be noted that air-conditioning panel is operating personnel's input unit, the air-conditioning panel top has control heat pump
The control button of air-conditioning system, such as, refrigeration key, heat key；Heat pump controller determines to work as according to the button of the air-conditioning panel
Operation of the preceding operating personnel to control system for heat pump.Specifically, when in refrigerating state, heat pump controller can set target
Overtemperature is first object temperature, and the first object temperature can determine according to the hardware performance of heat pump type air conditioning system, than
Such as, first object temperature is 5 DEG C；When in heat state when, heat pump controller can set target superheat temperature for the second mesh
Mark temperature, second target temperature can determine that such as, the second target temperature is according to the hardware performance of heat pump type air conditioning system
10℃。
Control device for electronic expansion valve in heat pump type air conditioning system provided in an embodiment of the present invention, heat pump controller is by the electricity
Dynamic compressor air-breathing end pressure is calculated the actual degree of superheat with the in-car heat exchanger outlet temperature, obtains air-conditioning panel and sends
Heat or refrigerating state, and according to it is described heat or refrigerating state set target superheat degree, by the actual degree of superheat and institute
State target superheat degree and make the difference and obtain degree of superheat deviation, electronic expansion valve opening is obtained by the degree of superheat deviation, and by the electricity
Sub- expansion valve opening is sent to the electric expansion valve, to control the work of the electric expansion valve.By the present invention, make heat pump
The flow of air-conditioning system refrigerant can directly meet the matching demand of compressor horsepower, can saving energy consumption；Make heat pump air conditioner system
System has quick-reaction capability, makes electric expansion valve in a short period of time rapidly close to target control value；Improve heat pump empty
The control accuracy and stability of adjusting system.
Specifically, the electric expansion valve includes：In valve body controller and the valve electrically connected with the valve body controller
Stepper motor；The valve body controller obtains the electronic expansion valve opening, and is calculated by the electronic expansion valve opening
The target operation step number is sent to stepping electricity in valve by the target operation step number of stepper motor in valve, the valve body controller
Machine, to control the work of stepper motor in the valve.
In another embodiment of apparatus of the present invention, the electric expansion valve can also include：It is connected in the valve
Hall sensor between stepper motor and the valve body controller；The Hall sensor is used to gather stepping electricity in the valve
The operation step number of machine；The valve body controller obtains the operation step number of stepper motor in the valve, and according to the operation step number,
Determine electronic expansion valve regulation whether failure.
Specifically, stepper motor often runs a step in valve, and the Hall sensor then remembers an operation step number, and this is transported
Row step number reports the valve body controller；The valve body controller determines electronic expansion valve regulation according to the operation step number
Whether failure.Such as, valve body controller detects the step number of the stepper motor in setting time internal valve and does not change, Huo Zheshe
Stepper motor in internal valve of fixing time does not work to expected step number, then valve body controller judges stepper motor failure i.e. electronics in valve
Expansion valve regulation failure.Setting time can be determined that such as setting time is 5s by different electric expansion valves by demarcating.
In another embodiment of apparatus of the present invention, the heat pump controller is getting the motor compressor air-breathing
After end pressure and the in-car heat exchanger outlet temperature, electricity is obtained by tabling look-up by the motor compressor air-breathing end pressure that obtains
Dynamic compressor suction end temperature, and the motor compressor suction end temperature is made the difference with the in-car heat exchanger outlet temperature
To the actual degree of superheat.
Specifically, the form tabled look-up is saturation temperature pressure gauge, and saturation temperature pressure gauge is represented：In saturation temperature T (DEG C)
Under corresponding pressure value P (MPa), heat pump controller obtains different full according to the refrigerants different in heat pump type air conditioning system of circulating
With temperature, pressure table；Such as, when circulated in heat pump type air conditioning system be R134a refrigerants when, then the saturation temperature pressure gauge such as institute of table 1
Show.Certainly, circulation can also be such as other refrigerants of CO2 in the refrigerant of heat pump type air conditioning system.
Further, in another embodiment of apparatus of the present invention, the heat pump controller after degree of superheat deviation is obtained,
Using it is described cross thermal deviation e target be calculated by PID adjust aperture CTS, and by last moment electronic expansion valve opening Kn-1
Aperture CTS sums are adjusted as Current electronic expansion valve opening K with the targetn, i.e. Kn=CTS+Kn-1；n≥0.It is described by institute
Stated thermal deviation e and target regulation aperture CTS was calculated by PID；Specifically, including：CTS=An+Bn+Cn；An=P*e；Bn
=I*e+Bn-1；Cn=D*e/ (tn-tn-1)；n≥1；Wherein, P, I, D are regulation parameters, and they are according to stabilization time, response speed
The development Experiences such as the factors such as degree, static error are demarcated and determined, such as, P is that 0.48, I is that 0.12, D is 0.01.Further, CTS is worked as
During ＞ 0, represent that the aperture of electric expansion valve is tuned up；As CTS ＜ 0, represent that the aperture of electric expansion valve is turned down；Work as electronic expansion
It is closed when valve is initial, i.e. CTS=0, i.e. A0=0, B0=0, C0=0.
In another embodiment of apparatus of the present invention, the valve body controller is getting the electronic expansion valve opening
Afterwards, the electronic expansion valve opening is substituted into opening curve equation, is walked by the target operation for being calculated stepper motor in valve
Number.
The opening curve figure of the embodiment of the present invention is illustrated in figure 4, the opening curve side obtained by opening curve figure
Cheng Wei：Kn=K0*(Fn-F0), n >=0；Wherein, KnRepresent Current electronic expansion valve opening；FnRepresent the target of stepper motor in valve
Work step number；F0Represent the initial step number of stepper motor action；K0Aperture coefficient is expressed as, is setting value.
It should be noted that F0、K0Determined by demarcating by according to the electric expansion valve of different model, such as F0It is 32, K0
It is 0.223, and Fn >=32.
Control device for electronic expansion valve in heat pump type air conditioning system provided in an embodiment of the present invention, by electric expansion valve
Increase Hall sensor, with by the operation step number of stepper motor in the Hall sensor real-time monitoring valve, according to the fortune
Row step number, determine electric expansion valve whether failure, so as to further ensure heat pump type air conditioning system reliability of operation.
In another embodiment of apparatus of the present invention embodiment, can also include：Controlled with the heat pump outside car
The second temperature sensor of device electrical connection, the second temperature sensor is used for collecting vehicle external environment temperature；The heat pump control
Device controls motor compressor rotating speed according to the in-car heat exchanger outlet temperature in refrigerating state with the degree of superheat deviation；
The heat pump controller controls the electronic pressure according to the car external environment temperature when state is heated with the degree of superheat deviation
Contracting machine rotating speed.
Specifically, in refrigerating state, whether the in-car heat exchanger outlet temperature of detection is more than zero to the heat pump controller；Such as
It is really, then the tachometer value according to the degree of superheat deviation to the motor compressor；Otherwise, the motor compressor is controlled to turn
Speed is the first tachometer value.It should be noted that first tachometer value is determined by the fundamental characteristics of motor compressor, such as, the
One tachometer value is 1000rpm.
Further, the heat pump controller is in refrigerating state, if detecting the degree of superheat deviation e more than the first temperature
Angle value or less than second temperature value, wherein the first temperature value is more than second temperature value, then controls the rotating speed of the motor compressor
It is the first initial speed N01+ rotating speed coefficient z* degree of superheat deviations e；If detecting the degree of superheat deviation e more than or equal to second
Temperature value and less than or equal to the first temperature value, then the rotating speed for controlling the motor compressor is the first initial speed N01。
It should be noted that the first temperature value, second temperature value, the first initial speed N01And rotating speed coefficient z is according to heat pump
The hardware configuration of control system determines that such as the first temperature value is 2 DEG C, and second temperature value is -2 DEG C, and first is initial by demarcating
Rotating speed N01It is 3000rpm, rotating speed coefficient z is 300rpm/ DEG C.
Specifically, when state is heated, whether detection car external environment temperature is in the first temperature range for the heat pump controller
In the range of；If it is, according to the degree of superheat deviation to the motor compressor tachometer value；Otherwise, the electricity is controlled
Dynamic compressor rotary speed is 0.It should be noted that the first temperature range is the temperature range that heat pump type air conditioning system can be heated, than
Such as, the first temperature range is (- 10 DEG C, 20 DEG C)；When car external environment temperature is more than 20 DEG C, it is necessary to close heat pump type air conditioning system；
When car external environment temperature is less than -10 DEG C, it is necessary to PTC or heating system are heated.
Further, the heat pump controller is when state is heated, if detecting the degree of superheat deviation e more than the first temperature
Angle value or less than second temperature value, wherein the first temperature value is more than second temperature value, then controls the rotating speed of the motor compressor
It is the second initial speed N02+ rotating speed coefficient z* degree of superheat deviations e；If detecting the degree of superheat deviation e more than or equal to second
Temperature value and less than or equal to the first temperature value, then the rotating speed for controlling the motor compressor is the first initial speed N02。
It should be noted that the first temperature value, second temperature value, the second initial speed N01And rotating speed coefficient z is according to heat pump
The hardware configuration of control system determines that such as the first temperature value is 2 DEG C, and second temperature value is -2 DEG C, and second is initial by demarcating
Rotating speed N02It is 5000rpm, rotating speed coefficient z is 300rpm/ DEG C.
In sum, control method for electronic expansion valve and device in heat pump type air conditioning system provided in an embodiment of the present invention, heat
Pump controller obtains motor compressor air-breathing end pressure and in-car heat exchanger outlet temperature, by the motor compressor air-breathing side pressure
Power obtains the actual degree of superheat with the motor compressor suction end temperature computation, and what acquisition air-conditioning panel sent heats or the shape that freezes
State；Heated or refrigerating state setting target superheat degree according to described；The actual degree of superheat is made the difference with the target superheat degree,
Obtain degree of superheat deviation；By the degree of superheat deviation, Current electronic expansion valve opening is obtained, and by the electronic expansion valve opening
Electric expansion valve is sent to, to control the work of the electric expansion valve.Further, the electric expansion valve work is being controlled
On the basis of, heat pump controller is according to car external environment temperature, interior heat exchanger outlet temperature and degree of superheat deviation to motor compressor
Rotating speed is accurately controlled, and so as to further increase the control accuracy and stability of heat pump type air conditioning system, and is reduced and is
System energy consumption.
The embodiment of the present invention is described in detail above, specific embodiment used herein is carried out to the present invention
Illustrate, the explanation of above example is only intended to help and understands system and method for the invention；Simultaneously for the one of this area
As technical staff, according to thought of the invention, will change in specific embodiments and applications, to sum up institute
State, this specification content should not be construed as limiting the invention.
Claims (11)
1. control method for electronic expansion valve in a kind of heat pump type air conditioning system, is applied to pure electric automobile, it is characterised in that including：
Motor compressor air-breathing end pressure is obtained with in-car heat exchanger outlet temperature；
By the motor compressor air-breathing end pressure and the in-car heat exchanger outlet temperature, the actual degree of superheat is calculated；
What acquisition air-conditioning panel sent heats or refrigerating state, and is heated or refrigerating state setting target superheat degree according to described；
The actual degree of superheat is made the difference with the target superheat degree and obtains degree of superheat deviation；
According to the degree of superheat deviation, Current electronic expansion valve opening is determined, and the electronic expansion valve opening is sent to electricity
Sub- expansion valve, to control the work of the electric expansion valve.
2. control method for electronic expansion valve according to claim 1, it is characterised in that the electric expansion valve includes：Valve
Stepper motor in body controller and the valve electrically connected with the valve body controller, methods described also includes：
The valve body controller obtains the electronic expansion valve opening, and is calculated step in valve by the electronic expansion valve opening
The target operation step number of stepper motor, is then sent to stepper motor in valve by the target operation step number, to control in the valve
The work of stepper motor.
3. control method for electronic expansion valve according to claim 2, it is characterised in that methods described also includes：
The valve body controller obtains the operation step number of stepper motor in the valve by Hall sensor；
According to the operation step number, determine electronic expansion valve regulation whether failure.
4. the control method for electronic expansion valve according to claim 1 or 2 or 3, it is characterised in that described by the electronic pressure
Contracting machine air-breathing end pressure and the in-car heat exchanger outlet temperature, being calculated the actual degree of superheat includes：
By the motor compressor air-breathing end pressure that obtains motor compressor suction end temperature is obtained by tabling look-up；
The motor compressor suction end temperature is made the difference with the in-car heat exchanger outlet temperature, the actual overheat is obtained
Degree.
5. control method for electronic expansion valve according to claim 4, it is characterised in that described inclined according to the degree of superheat
Difference, determines that Current electronic expansion valve opening includes：
Target regulation aperture is calculated by PID using the thermal deviation of crossing；
Last moment electronic expansion valve opening is adjusted into aperture sum as Current electronic expansion valve opening with the target.
6. control method for electronic expansion valve according to claim 5, it is characterised in that methods described also includes：
Obtain car external environment temperature；
In refrigerating state, turned with degree of superheat deviation control motor compressor according to the in-car heat exchanger outlet temperature
Speed；
When state is heated, the motor compressor rotating speed is controlled with the degree of superheat deviation according to the car external environment temperature.
7. control device for electronic expansion valve in a kind of heat pump type air conditioning system, is applied to pure electric automobile, the heat pump type air conditioning system
Including：Car external heat exchanger, four-way reversing valve, motor compressor, in-car heat exchanger, heat pump controller；The four-way reversing valve leads to
Pipeline is crossed to be connected with the car external heat exchanger, the motor compressor and the in-car heat exchanger respectively；Characterized in that, institute
Stating control device includes：Pressure sensor, the first temperature sensor and being connected to outside the in-car heat exchanger and the car is changed
Electric expansion valve between hot device；The heat pump controller respectively with air-conditioning panel, the pressure sensor, first temperature
Sensor, the electric expansion valve, the four-way reversing valve and the electric compressor mechatronics；The pressure sensor peace
Mounted in the motor compressor suction end, for gathering motor compressor air-breathing end pressure；First temperature sensor is installed
At the in-car heat exchanger exit, for heat exchanger outlet temperature in collecting vehicle；The heat pump controller is by the electronic pressure
Contracting machine air-breathing end pressure is calculated the actual degree of superheat with the in-car heat exchanger outlet temperature, obtains the system that air-conditioning panel sends
Heat or refrigerating state, and heated or refrigerating state setting target superheat degree according to described, by the actual degree of superheat and the mesh
The mark degree of superheat is made the difference and obtains degree of superheat deviation, and Current electronic expansion valve opening is determined according to the degree of superheat deviation, and will be described
Electronic expansion valve opening is sent to the electric expansion valve, to control the work of the electric expansion valve.
8. control device for electronic expansion valve according to claim 7, it is characterised in that the electric expansion valve includes：Valve
Stepper motor in body controller and the valve electrically connected with the valve body controller；It is swollen that the valve body controller obtains the electronics
Swollen valve opening, and the target operation step number of stepper motor in valve, the valve body control are calculated by the electronic expansion valve opening
The target operation step number is sent to stepper motor in valve by device processed, to control the work of stepper motor in the valve；
The electric expansion valve also includes：It is connected to the hall sensing between stepper motor and the valve body controller in the valve
Device；The Hall sensor is used to gather the operation step number of stepper motor in the valve；The valve body controller obtains the valve
The operation step number of interior stepper motor, and according to the operation step number, determine electronic expansion valve regulation whether failure.
9. the control device for electronic expansion valve according to claim 7 or 8, it is characterised in that the heat pump controller is being obtained
After getting the motor compressor air-breathing end pressure and the in-car heat exchanger outlet temperature, inhaled by the motor compressor that obtains
Gas end pressure obtains motor compressor suction end temperature by tabling look-up, and by the motor compressor suction end temperature and the car
Interior heat exchanger outlet temperature makes the difference and obtains the actual degree of superheat.
10. control device for electronic expansion valve according to claim 9, it is characterised in that the heat pump controller is being obtained
After degree of superheat deviation, using it is described cross thermal deviation target be calculated by PID adjust aperture, and by last moment electronic expansion
Valve opening adjusts aperture sum as Current electronic expansion valve opening with the target.
11. control device for electronic expansion valve according to claim 10, it is characterised in that described device also includes：
Installed in the outer second temperature sensor electrically connected with the heat pump controller of car, the second temperature sensor is used for
Collecting vehicle external environment temperature；
The heat pump controller is controlled according to the in-car heat exchanger outlet temperature in refrigerating state with the degree of superheat deviation
Motor compressor rotating speed；
The heat pump controller controls the electricity according to the car external environment temperature when state is heated with the degree of superheat deviation
Dynamic compressor rotary speed.
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