CN104482638A - Air conditioner and fault detection method for electronic expansion valve of air conditioner - Google Patents
Air conditioner and fault detection method for electronic expansion valve of air conditioner Download PDFInfo
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- CN104482638A CN104482638A CN201410752855.XA CN201410752855A CN104482638A CN 104482638 A CN104482638 A CN 104482638A CN 201410752855 A CN201410752855 A CN 201410752855A CN 104482638 A CN104482638 A CN 104482638A
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- expansion valve
- electric expansion
- conditioner
- air
- aperture
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
-
- 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
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Atmospheric Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a fault detection method for an electronic expansion valve of an air conditioner. The method comprises the following steps of controlling the present opening degree of the electronic expansion valve to be increased to a preset opening degree when an electronic expansion valve fault detection instruction is detected; acquiring the present exhaust gas temperature of a compressor; calculating a temperature difference between the exhaust gas temperature of the compressor when the electronic expansion valve fault detection instruction is detected and the exhaust gas temperature of the compressor after the present opening degree of the electronic expansion value is increased to the preset opening degree; determining that the electronic expansion valve is in fault when the temperature difference is out of a preset temperature difference range. The invention further discloses an air conditioner. According to the fault detection method for the electronic expansion valve of the air conditioner, the automatic fault detection of the electronic expansion valve can be realized by using the existing structure of the air conditioner, so that not only can the cost be not increased, but also the fault detection process is fast and reliable.
Description
Technical field
The present invention relates to air-conditioner technical field, particularly relate to a kind of fault method of air-conditioner and electric expansion valve thereof.
Background technology
Air-conditioner has become the essential of people's household, when especially outdoor temperature is higher or lower, indoor can be made to remain on comfortable temperature by air-conditioner.The off-premises station of present air-conditioner have employed electric expansion valve and to dam control to refrigerant pipeline to replace capillary.But, when the electric expansion valve of current use carries out aperture adjustment according to the control of the main control chip of air-conditioner, due to the self reason of circuit or electronic expansion valve body, electric expansion valve is not adjustment in fact, and now main control chip cannot find, air-conditioner still controls electric expansion valve according to original control method, so will cause the operation exception of whole air-conditioner, and cannot know the abnormal reason caused.
Summary of the invention
Main purpose of the present invention is the fault detection method providing a kind of air-conditioner and electric expansion valve thereof, is intended to the automatic detection realizing electric expansion valve fault, and detection failure quickly and accurately.
In order to achieve the above object, the invention provides a kind of electric expansion valve fault detection method of air-conditioner, comprise the following steps:
When detecting electric expansion valve fault detect instruction, the current aperture controlling electric expansion valve increases presets aperture;
Obtain the current exhaust gas temperature of compressor;
Calculate the temperature difference that the delivery temperature of compressor and the current aperture of electric expansion valve when detecting electric expansion valve fault detect instruction increase the compressor exhaust temperature after presetting aperture;
When the described temperature difference is when default temperature range is outer, determine electric expansion valve fault.
Preferably, the current exhaust gas temperature of described acquisition compressor comprises:
When controlling electric expansion valve and increasing default aperture and continue the first preset time threshold, obtain the current exhaust gas temperature of compressor.
Preferably, the value in described default temperature range arranges corresponding value according to the type of air-conditioner.
Preferably, described in when detecting electric expansion valve fault detect instruction, the current aperture controlling electric expansion valve increases to be preset aperture and comprises:
When detecting electric expansion valve fault detect instruction, judge whether the running time of current air-conditioner is more than or equal to the second preset time threshold;
When being more than or equal to the second preset time threshold the running time of current air-conditioner, the current aperture controlling electric expansion valve increases presets aperture;
When being less than the second preset time threshold the running time of current air-conditioner, carry out the normal control of electric expansion valve.
Preferably, the electric expansion valve fault detection method of described air-conditioner also comprises:
When the described temperature difference is in default temperature range, recover the normal control of electric expansion valve.
In addition, for achieving the above object, present invention also offers a kind of air-conditioner, described air-conditioner comprises the failure detector of electric expansion valve and electric expansion valve, and the failure detector of wherein said electric expansion valve comprises:
Detection control module, during for detecting electric expansion valve fault detect instruction, the current aperture controlling electric expansion valve increases presets aperture;
Delivery temperature acquisition module, the current aperture for controlling electric expansion valve obtains the current exhaust gas temperature of compressor after increasing default aperture; Time also for detecting electric expansion valve fault detect instruction, obtain the delivery temperature of compressor;
Differential thermal calculation module, when detecting electric expansion valve fault detect instruction for calculating, the delivery temperature of compressor and the current aperture of electric expansion valve increase the temperature difference of the compressor exhaust temperature after presetting aperture;
Fault determination module, for when the described temperature difference is when default temperature range is outer, determines electric expansion valve fault.
Preferably, described acquisition module is used for: when controlling electric expansion valve and increasing default aperture and continue the first preset time threshold, obtain the current exhaust gas temperature of compressor.
Preferably, the value in described default temperature range arranges corresponding value according to the type of air-conditioner.
Preferably, described detection control module is used for: when detecting electric expansion valve fault detect instruction, judges whether the running time of current air-conditioner is more than or equal to the second preset time threshold; When being more than or equal to the second preset time threshold the running time of current air-conditioner, the current aperture controlling electric expansion valve increases presets aperture; When being less than the second preset time threshold the running time of current air-conditioner, carry out the normal control of electric expansion valve.
Preferably, described detection control module also for: when the described temperature difference is in default temperature range, recover the normal control of electric expansion valve.
The embodiment of the present invention operates in default aperture by controlling electric expansion valve, obtains the current compressor delivery temperature of this electric expansion valve, then according to this compressor exhaust temperature, judges whether electric expansion valve breaks down.Therefore the embodiment of the present invention utilizes the existing structure of air-conditioner can realize the automatic detection of electric expansion valve fault, not only can not increase cost, and at process fault detection rapidly, reliably.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the electric expansion valve fault detection method of air-conditioner of the present invention;
Fig. 2 is the structural representation of air-conditioner one embodiment of the present invention;
Fig. 3 is the high-level schematic functional block diagram of the electric expansion valve failure detector of air-conditioner of the present invention.
In order to make technical scheme of the present invention clearly, understand, be described in further detail below in conjunction with accompanying drawing.
Detailed description of the invention
Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Core concept of the present invention is: impact the operation of air-conditioner when avoiding the action of electric expansion valve to lose efficacy, a kind of failure detection schemes of electric expansion valve is provided, default aperture is operated in by controlling electric expansion valve, obtain the current compressor delivery temperature of this electric expansion valve, then according to this compressor exhaust temperature, judge whether electric expansion valve breaks down.
As shown in Figure 1, the electric expansion valve fault detection method of a kind of air-conditioner of the present invention is shown.The electric expansion valve fault detection method of the air-conditioner in this embodiment can comprise the following steps:
Step S110, when detecting electric expansion valve fault detect instruction, the current aperture controlling electric expansion valve increases presets aperture;
Air-conditioner is in running, and when the aperture of electric expansion valve increases, the effect of damming of electric expansion valve reduces, then the delivery temperature of the off-premises station of air-conditioner can reduce.Therefore the embodiment of the present invention is when detecting electric expansion valve fault detect instruction, and the current aperture controlling electric expansion valve increases presets aperture.This default aperture can be arranged as the case may be and flexibly, and the current aperture that such as can control electric expansion valve increases to the maximum opening of this electric expansion valve.Or, when the current aperture of electric expansion valve is 100 step, the current aperture of this electric expansion valve is increased to 150 steps.
The aperture adjustment process of electric expansion valve is specially: the main control chip of air-conditioner sends drive pulse signal to electric expansion valve, controls the aperture of electric expansion valve.
The current exhaust gas temperature of step S120, acquisition compressor;
One temperature sensor is set in the exhaust ports of described compressor, for detecting the current exhaust gas temperature of compressor.In the present embodiment, when the aperture controlling electric expansion valve increases to default aperture, temperature sensor is utilized to obtain the current exhaust gas temperature T2 of compressor.
Step S130, calculate the temperature difference that the delivery temperature of compressor and the current aperture of electric expansion valve when detecting electric expansion valve fault detect instruction increase the compressor exhaust temperature after default aperture;
When detecting electric expansion valve fault detect instruction, temperature sensor is utilized to obtain the current exhaust gas temperature T1 of compressor.The temperature difference T=T1-T2 of the delivery temperature T1 of compressor when the aperture controlling electric expansion valve being increased to the delivery temperature T2 of compressor during default aperture and detect electric expansion valve fault detect instruction.
Step S140, when the described temperature difference is when default temperature range is outer, determine electric expansion valve fault.
In the present embodiment, the corresponding described default aperture of this default temperature range is arranged.And the value in this default temperature range also can arrange corresponding value according to the type of air-conditioner.The method to set up of this default temperature range is specifically as follows: before dispatching from the factory, air-conditioner is tested, the aperture controlling the electric expansion valve of air-conditioner increases presets aperture, obtain the delivery temperature of compressor before and after regulating, then calculate the temperature difference of the delivery temperature of compressor before and after regulating, and default temperature range is set according to this temperature difference.This default temperature range is normal temperature range.When such as, before and after calculating obtains and regulates the temperature difference of the delivery temperature of compressor is 5 DEG C, then temperature range is set for being more than or equal to 5 DEG C.
According to the temperature difference T obtained in step S130, judge this temperature difference whether in default temperature range, when the temperature difference is in default temperature range (such as, Δ T >=5 DEG C), determines that electric expansion valve is normal, namely recover the normal control of electric expansion valve; When the temperature difference is outside default temperature range (such as, Δ T<5 DEG C), determine electric expansion valve fault.
The embodiment of the present invention operates in default aperture by controlling electric expansion valve, obtains the current compressor delivery temperature of this electric expansion valve, then according to this compressor exhaust temperature, judges whether electric expansion valve breaks down.Therefore the embodiment of the present invention utilizes the existing structure of air-conditioner can realize the automatic detection of electric expansion valve fault, not only can not increase cost, and at process fault detection rapidly, reliably.
Further, after adjusting electric expansion valve, the delivery temperature of compressor can not change at once, thus control electric expansion valve increase preset aperture time, must the delivery temperature of machine to be compressed stable after, then obtain the delivery temperature of this compressor.In the embodiment of the present invention, when controlling electric expansion valve and increasing default aperture and continue the first preset time threshold, obtain the current exhaust gas temperature of compressor, to ensure that the delivery temperature of this compressor is closer to the actual exhaust air temperature after electric expansion valve adjustment.In the present embodiment, the span of this first preset time threshold is 3-6 minute, is preferably 5 minutes.
Further, due to air-conditioner after powering, air-conditioner needs to run the regular hour and just can reach stable state, if so the compressor exhaust temperature that obtains when air-conditioner is unstable can erroneous judgement because causing electric expansion valve fault.Therefore, in the present embodiment, when detecting electric expansion valve fault detect instruction, will judge whether the running time of current air-conditioner is more than or equal to the second preset time threshold.If so, the current aperture then controlling electric expansion valve increases presets aperture; If not, then electric expansion valve is normally controlled, such as, be positioned at the aperture corresponding to delivery temperature according to the delivery temperature adjustment electric expansion valve of compressor.In the present embodiment, the span of this second preset time threshold is 20-30 minute, is preferably 25 minutes.
The process fault detection of the electric expansion valve fault detection method of above-mentioned air-conditioner is specifically described below by way of an example.Wherein, the first preset time threshold is 5 minutes; Second preset time threshold is 30 minutes; When fault detect, the aperture controlling electric expansion valve is adjusted to the maximum opening (such as 480 steps) of this electric expansion valve, and the default temperature range of its correspondence is for being more than or equal to 4 DEG C.
S1: user starts shooting, compressor start, and running frequency is 40Hz, and air-conditioner operates in heating mode;
S2: according to the delivery temperature of compressor, electric expansion valve carries out corresponding action;
S3: compressor operating, after 30 minutes, records the outlet air temperature T1=55 DEG C that now exhaust gas temperature sensor detects;
S4: air-conditioner main control chip sends drive pulse signal to electric expansion valve, allows electronic expansion valve opening increase to 480 steps by 200 current steps;
S5: after the aperture of electric expansion valve is adjusted to 5 minutes of 480 steps, record the outlet air temperature T2=50 DEG C that now exhaust gas temperature sensor detects;
S6: the difference=T1-T2=5 DEG C comparing T2 and T1;
S7: difference DELTA T and default temperature range are compared, namely Δ T is within default temperature range, determine that electric expansion valve is normal, Δ T, outside default temperature range, determines electric expansion valve fault.
Accordingly, as shown in Figure 2, a kind of air-conditioner one embodiment realizing the fault detect of electric expansion valve of the present invention is shown.This air-conditioner comprises compressor assembly 1, cross valve 2, indoor heat exchanger 3, outdoor heat exchanger 4 and electric expansion valve 5, wherein compressor assembly 1 can comprise compressor 1a and fluid reservoir 1b, and cross valve 2 comprises four ports (port 2a, port 2b, port 2c, port 2d).Connected by pipeline between compressor assembly, cross valve 2, indoor heat exchanger 3, outdoor heat exchanger 4, electric expansion valve 5, form refrigerating/heating closed circuit.The exhaust ports of this compressor 1a is provided with temperature sensor 11a.In addition, this air-conditioner also comprises a failure detector 6, this failure detector 6 is for when needs carry out fault detect, the aperture controlling electric expansion valve increases to default aperture, obtain the current compressor delivery temperature of this electric expansion valve, then according to this compressor exhaust temperature, judge whether electric expansion valve breaks down.
As shown in Figure 3, electric expansion valve failure detector first embodiment of air-conditioner of the present invention is shown.The electric expansion valve failure detector 6 of this embodiment comprises:
Detection control module 61, during for detecting electric expansion valve fault detect instruction, the current aperture controlling electric expansion valve increases presets aperture;
Delivery temperature acquisition module 62, the current aperture for controlling electric expansion valve obtains the current exhaust gas temperature of compressor after increasing default aperture; Time also for detecting electric expansion valve fault detect instruction, obtain the delivery temperature of compressor;
Differential thermal calculation module 63, when detecting electric expansion valve fault detect instruction for calculating, the delivery temperature of compressor and the current aperture of electric expansion valve increase the temperature difference of the compressor exhaust temperature after presetting aperture;
Fault determination module 64, for when the described temperature difference is when default temperature range is outer, determines electric expansion valve fault.
Air-conditioner is in running, and when the aperture of electric expansion valve increases, the effect of damming of electric expansion valve reduces, then the delivery temperature of the off-premises station of air-conditioner can reduce.Therefore the embodiment of the present invention is when detecting electric expansion valve fault detect instruction, and the current aperture that fault detection module 110 controls electric expansion valve increases default aperture.This default aperture can be arranged as the case may be and flexibly, and the current aperture that such as can control electric expansion valve increases to the maximum opening of this electric expansion valve.Or, when the current aperture of electric expansion valve is 100 step, the current aperture of this electric expansion valve is increased to 150 steps.The aperture adjustment process of electric expansion valve is specially: the main control chip of air-conditioner sends drive pulse signal to electric expansion valve, controls the aperture of electric expansion valve.
When the aperture controlling electric expansion valve increases to default aperture, delivery temperature acquisition module 120 utilizes temperature sensor to obtain the current exhaust gas temperature T2 of compressor.When detecting electric expansion valve fault detect instruction, delivery temperature acquisition module 120 utilizes temperature sensor to obtain the current exhaust gas temperature T1 of compressor.Differential thermal calculation module 130 is by the temperature difference T=T1-T2 of the delivery temperature T2 controlling compressor when the aperture of electric expansion valve increases to default aperture with the delivery temperature T1 of compressor when detecting electric expansion valve fault detect instruction.
In fault determination module 140, preset the corresponding described default aperture of temperature range and arrange.And the value in this default temperature range also can arrange corresponding value according to the type of air-conditioner.The method to set up of this default temperature range is specifically as follows: before dispatching from the factory, air-conditioner is tested, the aperture controlling the electric expansion valve of air-conditioner increases presets aperture, obtain the delivery temperature of compressor before and after regulating, then calculate the temperature difference of the delivery temperature of compressor before and after regulating, and default temperature range is set according to this temperature difference.This default temperature range is normal temperature range.When such as, before and after calculating obtains and regulates the temperature difference of the delivery temperature of compressor is 5 DEG C, then temperature range is set for being more than or equal to 5 DEG C.The temperature difference T that fault determination module 140 obtains according to differential thermal calculation module 130, judge this temperature difference whether in default temperature range, when the temperature difference is in default temperature range (such as, Δ T >=5 DEG C), determine that electric expansion valve is normal, namely recover the normal control of electric expansion valve; When the temperature difference is outside default temperature range (such as, Δ T<5 DEG C), determine electric expansion valve fault.
The embodiment of the present invention operates in default aperture by controlling electric expansion valve, obtains the current compressor delivery temperature of this electric expansion valve, then according to this compressor exhaust temperature, judges whether electric expansion valve breaks down.Therefore the embodiment of the present invention utilizes the existing structure of air-conditioner can realize the automatic detection of electric expansion valve fault, not only can not increase cost, and at process fault detection rapidly, reliably.
Further, after adjusting electric expansion valve, the delivery temperature of compressor can not change at once, thus control electric expansion valve increase preset aperture time, must the delivery temperature of machine to be compressed stable after, then obtain the delivery temperature of this compressor.In the embodiment of the present invention, delivery temperature acquisition module 120 is when controlling electric expansion valve and increasing default aperture and continue the first preset time threshold, obtain the current exhaust gas temperature of compressor, to ensure that the delivery temperature of this compressor is closer to the actual exhaust air temperature after electric expansion valve adjustment.In the present embodiment, the span of this first preset time threshold is 3-6 minute, is preferably 5 minutes.
Further, due to air-conditioner after powering, air-conditioner needs to run the regular hour and just can reach stable state, if so the compressor exhaust temperature that obtains when air-conditioner is unstable can erroneous judgement because causing electric expansion valve fault.Therefore, in the present embodiment, when detecting electric expansion valve fault detect instruction, fault detection module 110 will judge whether the running time of current air-conditioner is more than or equal to the second preset time threshold.If so, the current aperture then controlling electric expansion valve increases presets aperture; If not, then electric expansion valve is normally controlled, such as, be positioned at the aperture corresponding to delivery temperature according to the delivery temperature adjustment electric expansion valve of compressor.In the present embodiment, the span of this second preset time threshold is 20-30 minute, is preferably 25 minutes.
The foregoing is only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize description of the present invention and accompanying drawing content to do equivalent structure or flow process conversion; or be directly or indirectly used in other relevant technical field, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. an electric expansion valve fault detection method for air-conditioner, is characterized in that, the electric expansion valve fault detection method of described air-conditioner comprises the following steps:
When detecting electric expansion valve fault detect instruction, the current aperture controlling electric expansion valve increases presets aperture;
Obtain the current exhaust gas temperature of compressor;
Calculate the temperature difference that the delivery temperature of compressor and the current aperture of electric expansion valve when detecting electric expansion valve fault detect instruction increase the compressor exhaust temperature after presetting aperture;
When the described temperature difference is when default temperature range is outer, determine electric expansion valve fault.
2. the electric expansion valve fault detection method of air-conditioner as claimed in claim 1, it is characterized in that, the current exhaust gas temperature of described acquisition compressor comprises:
When controlling electric expansion valve and increasing default aperture and continue the first preset time threshold, obtain the current exhaust gas temperature of compressor.
3. the electric expansion valve fault detection method of air-conditioner as claimed in claim 1, it is characterized in that, the value in described default temperature range arranges corresponding value according to the type of air-conditioner.
4. the electric expansion valve fault detection method of the air-conditioner as described in any one of claim 1-3, is characterized in that, described in when detecting electric expansion valve fault detect instruction, the current aperture controlling electric expansion valve increases to be preset aperture and comprises:
When detecting electric expansion valve fault detect instruction, judge whether the running time of current air-conditioner is more than or equal to the second preset time threshold;
When being more than or equal to the second preset time threshold the running time of current air-conditioner, the current aperture controlling electric expansion valve increases presets aperture;
When being less than the second preset time threshold the running time of current air-conditioner, carry out the normal control of electric expansion valve.
5. the electric expansion valve fault detection method of air-conditioner as claimed in claim 1, it is characterized in that, the electric expansion valve fault detection method of described air-conditioner also comprises:
When the described temperature difference is in default temperature range, recover the normal control of electric expansion valve.
6. an air-conditioner, described air-conditioner comprises electric expansion valve, it is characterized in that, described air-conditioner also comprises the failure detector of electric expansion valve, and the failure detector of wherein said electric expansion valve comprises:
Detection control module, during for detecting electric expansion valve fault detect instruction, the current aperture controlling electric expansion valve increases presets aperture;
Delivery temperature acquisition module, the current aperture for controlling electric expansion valve obtains the current exhaust gas temperature of compressor after increasing default aperture; Time also for detecting electric expansion valve fault detect instruction, obtain the delivery temperature of compressor;
Differential thermal calculation module, when detecting electric expansion valve fault detect instruction for calculating, the delivery temperature of compressor and the current aperture of electric expansion valve increase the temperature difference of the compressor exhaust temperature after presetting aperture;
Fault determination module, for when the described temperature difference is when default temperature range is outer, determines electric expansion valve fault.
7. air-conditioner as claimed in claim 6, it is characterized in that, described acquisition module is used for: when controlling electric expansion valve and increasing default aperture and continue the first preset time threshold, obtain the current exhaust gas temperature of compressor.
8. air-conditioner as claimed in claim 6, it is characterized in that, the value in described default temperature range arranges corresponding value according to the type of air-conditioner.
9. air-conditioner as claimed in claim 6, it is characterized in that, described detection control module is used for: when detecting electric expansion valve fault detect instruction, judges whether the running time of current air-conditioner is more than or equal to the second preset time threshold; When being more than or equal to the second preset time threshold the running time of current air-conditioner, the current aperture controlling electric expansion valve increases presets aperture; When being less than the second preset time threshold the running time of current air-conditioner, carry out the normal control of electric expansion valve.
10. air-conditioner as claimed in claim 6, is characterized in that, described detection control module also for: when the described temperature difference is in default temperature range, recover the normal control of electric expansion valve.
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