CN104807139A - Control method of air conditioner and control device - Google Patents

Control method of air conditioner and control device Download PDF

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Publication number
CN104807139A
CN104807139A CN201510200836.0A CN201510200836A CN104807139A CN 104807139 A CN104807139 A CN 104807139A CN 201510200836 A CN201510200836 A CN 201510200836A CN 104807139 A CN104807139 A CN 104807139A
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CN
China
Prior art keywords
described
pressure difference
difference value
air
compressor
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Application number
CN201510200836.0A
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Chinese (zh)
Inventor
晏飞
杜京昌
Original Assignee
广东美的制冷设备有限公司
美的集团股份有限公司
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Priority to CN201510200836.0A priority Critical patent/CN104807139A/en
Publication of CN104807139A publication Critical patent/CN104807139A/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/30Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/62Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/70Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/30Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/46Improving electric energy efficiency or saving
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/70Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/85Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using variable-flow pumps

Abstract

The invention provides a control method of an air conditioner and a control device. The air conditioner comprises an outdoor unit, wherein the outdoor unit is provided with a compressor, an outdoor heat exchanger and a fan which is used for facilitating the radiation of the outdoor heat exchanger; the control method of the air conditioner comprises the steps: when the air condition works under a refrigeration mode, a pressure value of a high pressure end of the compressor and a pressure value of a lower pressure end of the compressor are detected; a pressure difference value between the high pressure end of the compressor and the lower pressure end of the compressor is calculated; the rotating velocity of the fan is controlled according to the pressure difference value and the pressure difference value is controlled in a preset range. According to the technical scheme, the pressure difference value between the high pressure end and the lower pressure end of the compressor is controlled within the preset range, the smooth circulation of a refrigerant in the air conditioner is ensured, and the energy efficiency of the air conditioner can be favorably improved.

Description

The control method of air-conditioner and control device

Technical field

The present invention relates to air-conditioner technical field, in particular to a kind of control method of air-conditioner and a kind of control device of air-conditioner.

Background technology

Domestic consumer is generally high-temperature refrigeration, low-temperature heating for the functional requirement of air-conditioner, and designer only considers the demand of this domestic consumer at design aspect great majority.But at present at Europe, North America and much small-sized machine room, domestic air conditioning is all used to dispel the heat, air-conditioner needs to run in cooling mode for a long time, and under low temperature chamber external environment during long-play, the heat transfer effect of the outdoor heat exchanger of air-conditioner is better, and then can affect the pressure differential of high and low pressure of air-conditioner system, causes cold-producing medium to circulate not smooth, refrigeration is bad, causes the efficiency of air-conditioner lower.

Therefore, how effectively can maintain the pressure differential of compressor high-voltage end and low-pressure end, guarantee the technical problem that air-conditioner has higher efficiency and becomes urgently to be resolved hurrily.

Summary of the invention

The present invention is intended at least to solve one of technical problem existed in prior art or correlation technique.

For this reason, one object of the present invention is the control method proposing a kind of new air-conditioner, pressure difference value between compressor high-voltage end and low-pressure end can be controlled in predetermined scope, and then can guarantee that the circulation of air-conditioner inner refrigerant is smooth and easy, be conducive to the efficiency improving air-conditioner.

Another object of the present invention is the control device proposing a kind of air-conditioner.

For achieving the above object, embodiment according to a first aspect of the invention, propose a kind of control method of air-conditioner, described air-conditioner comprises off-premises station, compressor and outdoor heat exchanger is provided with in described off-premises station, and the blower fan for impelling described outdoor heat exchanger to dispel the heat, the control method of described air-conditioner, comprise: when described air-conditioner works in a chiller mode, detect the force value of described compressor high-voltage end and the force value of described compressor low-pressure end; Calculate the pressure difference value between described compressor high-voltage end and described compressor low-pressure end; Control according to the rotating speed of described pressure difference value to described blower fan, so that described pressure difference value is controlled in preset range.

The control method of air-conditioner according to an embodiment of the invention, because the high-pressure side of compressor and the pressure differential of low-pressure end can affect the circulation of whole system inner refrigerant, remote-effects effect of air-conditioner, therefore by when air-conditioner runs in a chiller mode, detect the force value of compressor high-voltage end and the force value of low-pressure end, and the rotating speed of blower fan is controlled according to the pressure difference value between compressor high-voltage end and low-pressure end, the pressure difference value between compressor high-voltage end and low-pressure end is made it possible to control in predetermined scope, and then can guarantee that the circulation of air-conditioner inner refrigerant is smooth and easy, solve air-conditioner carry out for a long time freezing under outdoor low temperature environment and cause cold-producing medium to circulate not smooth problem, improve the efficiency of air-conditioner.

The control method of air-conditioner according to the abovementioned embodiments of the present invention, can also have following technical characteristic:

According to one embodiment of present invention, specifically comprise according to the step that the rotating speed of described pressure difference value to described blower fan controls: when described pressure difference value is more than or equal to the maximum in described preset range, progressively increase the rotating speed of described blower fan, until described pressure difference value is in described preset range; When described pressure difference value is less than or equal to the minimum of a value in described preset range, progressively reduce the rotating speed of described blower fan, until described pressure difference value is in described preset range; When described pressure difference value is in described preset range, control the rotating speed that described blower fan remains current.

The control method of air-conditioner according to an embodiment of the invention, because the rotating speed of blower fan is larger on the pressure difference value impact between compressor high-voltage end and low-pressure end, particularly, in certain scope, the rotating speed of blower fan and the inversely proportional relation of the pressure difference value between compressor high-voltage end and low-pressure end, when therefore can be more than or equal to the maximum in preset range at pressure difference value, progressively increase the rotating speed of blower fan, to reduce pressure difference value; When being less than or equal to the minimum of a value in preset range at pressure difference value, progressively reduce the rotating speed of blower fan, to increase pressure difference value; When pressure difference value is in preset range, controls blower fan and maintain current rotating speed, thus ensure that the high-pressure side of compressor and the pressure difference value of low-pressure end are in suitable scope, guarantee that the circulation of air-conditioner inner refrigerant is smooth and easy, improve the efficiency of air-conditioner.

According to one embodiment of present invention, before the step detecting the force value of described compressor high-voltage end and the force value of described compressor low-pressure end, also comprise: the operation duration detecting environment temperature residing for described off-premises station and/or described compressor; Be less than or equal to predetermined temperature value in described environment temperature, and/or when the operation duration of described compressor reaches the first scheduled duration, perform the step detecting the force value of described compressor high-voltage end and the force value of described compressor low-pressure end.

The control method of air-conditioner according to an embodiment of the invention, when environment temperature residing for off-premises station is lower, the heat transfer effect of outdoor heat exchanger is relatively better, easily there is larger fluctuation in the high-pressure side of compressor and the pressure difference value of low-pressure end, therefore can control the rotating speed of blower fan according to above-mentioned pressure difference value.By detecting the operation duration of compressor, and when the operation duration of compressor reaches the first scheduled duration, detect the force value of compressor high-voltage end and the force value of compressor low-pressure end again, make it possible to detect again after compressor operating is stable, avoid the measure error caused because system is unstable.

According to one embodiment of present invention, when described environment temperature is less than or equal to described predetermined temperature value, also comprise: the initial speed setting described blower fan according to described environment temperature.

The control method of air-conditioner according to an embodiment of the invention, sets the initial speed of described blower fan by environmentally temperature, makes air-conditioner have preferably performance upon actuation.

According to one embodiment of present invention, also comprise: often through the second scheduled duration, all again perform the step controlled according to the rotating speed of described pressure difference value to described blower fan.

The control method of air-conditioner according to an embodiment of the invention, because indoor and outdoor surroundings temperature is all ceaselessly changing, therefore pass through often through the second scheduled duration, all again control according to the rotating speed of pressure difference value to blower fan, make it possible to the pressure difference value of compressor high-voltage end and low-pressure end to maintain in predetermined scope always, ensure that air-conditioner has preferably performance all the time.

According to one embodiment of present invention, also comprise: the size setting described preset range according to the running frequency of described compressor.

The control method of air-conditioner according to an embodiment of the invention, by the size of the running frequency setting preset range according to compressor, makes the preset range selected can be adapted to the performance of compressor, and then can guarantee that air-conditioner system has higher efficiency.

Embodiment according to a second aspect of the present invention, also proposed a kind of control device of air-conditioner, described air-conditioner comprises off-premises station, compressor and outdoor heat exchanger is provided with in described off-premises station, and the blower fan for impelling described outdoor heat exchanger to dispel the heat, the control device of described air-conditioner, comprising: the first detecting unit, for when described air-conditioner works in a chiller mode, detect the force value of described compressor high-voltage end and the force value of described compressor low-pressure end; Computing unit, for calculating the pressure difference value between described compressor high-voltage end and described compressor low-pressure end; Control unit, for controlling according to the rotating speed of described pressure difference value to described blower fan, to control described pressure difference value in preset range.

The control device of air-conditioner according to an embodiment of the invention, because the high-pressure side of compressor and the pressure differential of low-pressure end can affect the circulation of whole system inner refrigerant, remote-effects effect of air-conditioner, therefore by when air-conditioner runs in a chiller mode, detect the force value of compressor high-voltage end and the force value of low-pressure end, and the rotating speed of blower fan is controlled according to the pressure difference value between compressor high-voltage end and low-pressure end, the pressure difference value between compressor high-voltage end and low-pressure end is made it possible to control in predetermined scope, and then can guarantee that the circulation of air-conditioner inner refrigerant is smooth and easy, solve air-conditioner carry out for a long time freezing under outdoor low temperature environment and cause cold-producing medium to circulate not smooth problem, improve the efficiency of air-conditioner.

The control device of air-conditioner according to the abovementioned embodiments of the present invention, can also have following technical characteristic:

According to one embodiment of present invention, described control unit specifically for: when described pressure difference value is more than or equal to the maximum in described preset range, progressively increase the rotating speed of described blower fan, until described pressure difference value is in described preset range; When described pressure difference value is less than or equal to the minimum of a value in described preset range, progressively reduce the rotating speed of described blower fan, until described pressure difference value is in described preset range; When described pressure difference value is in described preset range, control the rotating speed that described blower fan remains current.

The control device of air-conditioner according to an embodiment of the invention, because the rotating speed of blower fan is larger on the pressure difference value impact between compressor high-voltage end and low-pressure end, particularly, in certain scope, the rotating speed of blower fan and the inversely proportional relation of the pressure difference value between compressor high-voltage end and low-pressure end, when therefore can be more than or equal to the maximum in preset range at pressure difference value, progressively increase the rotating speed of blower fan, to reduce pressure difference value; When being less than or equal to the minimum of a value in preset range at pressure difference value, progressively reduce the rotating speed of blower fan, to increase pressure difference value; When pressure difference value is in preset range, controls blower fan and maintain current rotating speed, thus ensure that the high-pressure side of compressor and the pressure difference value of low-pressure end are in suitable scope, guarantee that the circulation of air-conditioner inner refrigerant is smooth and easy, improve the efficiency of air-conditioner.

According to one embodiment of present invention, also comprise: the second detecting unit, for detect the force value of described compressor high-voltage end and the force value of described compressor low-pressure end at described first detecting unit before, detect the operation duration of environment temperature residing for described off-premises station and/or described compressor; Described first detecting unit specifically for, detect that described environment temperature is less than or equal to predetermined temperature value at described second detecting unit, and/or the operation duration of described compressor is when reaching the first scheduled duration, detect the force value of described compressor high-voltage end and the force value of described compressor low-pressure end.

The control device of air-conditioner according to an embodiment of the invention, when environment temperature residing for off-premises station is lower, the heat transfer effect of outdoor heat exchanger is relatively better, easily there is larger fluctuation in the high-pressure side of compressor and the pressure difference value of low-pressure end, therefore can control the rotating speed of blower fan according to above-mentioned pressure difference value.By detecting the operation duration of compressor, and when the operation duration of compressor reaches the first scheduled duration, detect the force value of compressor high-voltage end and the force value of compressor low-pressure end again, make it possible to detect again after compressor operating is stable, avoid the measure error caused because system is unstable.

According to one embodiment of present invention, described control unit also for, when described environment temperature is less than or equal to described predetermined temperature value, set the initial speed of described blower fan according to described environment temperature.

The control device of air-conditioner according to an embodiment of the invention, sets the initial speed of described blower fan by environmentally temperature, makes air-conditioner have preferably performance upon actuation.

According to one embodiment of present invention, described control unit also for, often through the second scheduled duration, all again control according to the rotating speed of described pressure difference value to described blower fan.

The control device of air-conditioner according to an embodiment of the invention, because indoor and outdoor surroundings temperature is all ceaselessly changing, therefore pass through often through the second scheduled duration, all again control according to the rotating speed of pressure difference value to blower fan, make it possible to the pressure difference value of compressor high-voltage end and low-pressure end to maintain in predetermined scope always, ensure that air-conditioner has preferably performance all the time.

According to one embodiment of present invention, also comprise: setup unit, for setting the size of described preset range according to the running frequency of described compressor.

The control device of air-conditioner according to an embodiment of the invention, by the size of the running frequency setting preset range according to compressor, makes the preset range selected can be adapted to the performance of compressor, and then can guarantee that air-conditioner system has higher efficiency.

Embodiment according to a third aspect of the present invention, also proposed a kind of air-conditioner, comprising: the control device of the air-conditioner as described in above-mentioned any one embodiment.

Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.

Accompanying drawing explanation

Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:

Fig. 1 shows the schematic flow sheet of the control method of air-conditioner according to an embodiment of the invention;

Fig. 2 shows the schematic block diagram of the control device of air-conditioner according to an embodiment of the invention;

Fig. 3 shows the schematic flow sheet of the control method of air-conditioner according to another embodiment of the invention.

Detailed description of the invention

In order to more clearly understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.It should be noted that, when not conflicting, the feature in the embodiment of the application and embodiment can combine mutually.

Set forth a lot of detail in the following description so that fully understand the present invention; but; the present invention can also adopt other to be different from other modes described here and implement, and therefore, protection scope of the present invention is not by the restriction of following public specific embodiment.

The air-conditioner that the present invention proposes comprises off-premises station, is provided with compressor and outdoor heat exchanger in described off-premises station, and the blower fan for impelling described outdoor heat exchanger to dispel the heat.

Fig. 1 shows the schematic flow sheet of the control method of air-conditioner according to an embodiment of the invention.

As shown in Figure 1, the control method of air-conditioner according to an embodiment of the invention, comprising: step 102, when described air-conditioner works in a chiller mode, detects the force value of described compressor high-voltage end and the force value of described compressor low-pressure end; Step 104, calculates the pressure difference value between described compressor high-voltage end and described compressor low-pressure end; Step 106, controls according to the rotating speed of described pressure difference value to described blower fan, to be controlled in preset range by described pressure difference value.

Because the high-pressure side of compressor and the pressure differential of low-pressure end can affect the circulation of whole system inner refrigerant, remote-effects effect of air-conditioner, therefore by when air-conditioner runs in a chiller mode, detect the force value of compressor high-voltage end and the force value of low-pressure end, and the rotating speed of blower fan is controlled according to the pressure difference value between compressor high-voltage end and low-pressure end, the pressure difference value between compressor high-voltage end and low-pressure end is made it possible to control in predetermined scope, and then can guarantee that the circulation of air-conditioner inner refrigerant is smooth and easy, solve air-conditioner carry out for a long time freezing under outdoor low temperature environment and cause cold-producing medium to circulate not smooth problem, improve the efficiency of air-conditioner.

The control method of air-conditioner according to the abovementioned embodiments of the present invention, can also have following technical characteristic:

According to one embodiment of present invention, specifically comprise according to the step that the rotating speed of described pressure difference value to described blower fan controls: when described pressure difference value is more than or equal to the maximum in described preset range, progressively increase the rotating speed of described blower fan, until described pressure difference value is in described preset range; When described pressure difference value is less than or equal to the minimum of a value in described preset range, progressively reduce the rotating speed of described blower fan, until described pressure difference value is in described preset range; When described pressure difference value is in described preset range, control the rotating speed that described blower fan remains current.

Because the rotating speed of blower fan is larger on the pressure difference value impact between compressor high-voltage end and low-pressure end, particularly, in certain scope, the rotating speed of blower fan and the inversely proportional relation of the pressure difference value between compressor high-voltage end and low-pressure end, when therefore can be more than or equal to the maximum in preset range at pressure difference value, progressively increase the rotating speed of blower fan, to reduce pressure difference value; When being less than or equal to the minimum of a value in preset range at pressure difference value, progressively reduce the rotating speed of blower fan, to increase pressure difference value; When pressure difference value is in preset range, controls blower fan and maintain current rotating speed, thus ensure that the high-pressure side of compressor and the pressure difference value of low-pressure end are in suitable scope, guarantee that the circulation of air-conditioner inner refrigerant is smooth and easy, improve the efficiency of air-conditioner.

According to one embodiment of present invention, before the step detecting the force value of described compressor high-voltage end and the force value of described compressor low-pressure end, also comprise: the operation duration detecting environment temperature residing for described off-premises station and/or described compressor; Be less than or equal to predetermined temperature value in described environment temperature, and/or when the operation duration of described compressor reaches the first scheduled duration, perform the step detecting the force value of described compressor high-voltage end and the force value of described compressor low-pressure end.

When environment temperature residing for off-premises station is lower, the heat transfer effect of outdoor heat exchanger is relatively better, and larger fluctuation easily appears in the high-pressure side of compressor and the pressure difference value of low-pressure end, therefore can control the rotating speed of blower fan according to above-mentioned pressure difference value.By detecting the operation duration of compressor, and when the operation duration of compressor reaches the first scheduled duration, detect the force value of compressor high-voltage end and the force value of compressor low-pressure end again, make it possible to detect again after compressor operating is stable, avoid the measure error caused because system is unstable.

According to one embodiment of present invention, when described environment temperature is less than or equal to described predetermined temperature value, also comprise: the initial speed setting described blower fan according to described environment temperature.

Set the initial speed of described blower fan by environmentally temperature, make air-conditioner have preferably performance upon actuation.

According to one embodiment of present invention, also comprise: often through the second scheduled duration, all again perform the step controlled according to the rotating speed of described pressure difference value to described blower fan.

Because indoor and outdoor surroundings temperature is all ceaselessly changing, therefore pass through often through the second scheduled duration, all again control according to the rotating speed of pressure difference value to blower fan, make it possible to the pressure difference value of compressor high-voltage end and low-pressure end to maintain in predetermined scope always, ensure that air-conditioner has preferably performance all the time.

According to one embodiment of present invention, also comprise: the size setting described preset range according to the running frequency of described compressor.

By the size of the running frequency setting preset range according to compressor, make the preset range selected can be adapted to the performance of compressor, and then can guarantee that air-conditioner system has higher efficiency.

Fig. 2 shows the schematic block diagram of the control device of air-conditioner according to an embodiment of the invention.

As shown in Figure 2, the control device 200 of air-conditioner according to an embodiment of the invention, comprising: the first detecting unit 202, for when air-conditioner works in a chiller mode, detects the force value of compressor high-voltage end and the force value of described compressor low-pressure end; Computing unit 204, for calculating the pressure difference value between described compressor high-voltage end and described compressor low-pressure end; Control unit 206, for controlling according to the rotating speed of described pressure difference value to blower fan, to control described pressure difference value in preset range.

Because the high-pressure side of compressor and the pressure differential of low-pressure end can affect the circulation of whole system inner refrigerant, remote-effects effect of air-conditioner, therefore by when air-conditioner runs in a chiller mode, detect the force value of compressor high-voltage end and the force value of low-pressure end, and the rotating speed of blower fan is controlled according to the pressure difference value between compressor high-voltage end and low-pressure end, the pressure difference value between compressor high-voltage end and low-pressure end is made it possible to control in predetermined scope, and then can guarantee that the circulation of air-conditioner inner refrigerant is smooth and easy, solve air-conditioner carry out for a long time freezing under outdoor low temperature environment and cause cold-producing medium to circulate not smooth problem, improve the efficiency of air-conditioner.

The control device 200 of air-conditioner according to the abovementioned embodiments of the present invention, can also have following technical characteristic:

According to one embodiment of present invention, described control unit 206 specifically for: when described pressure difference value is more than or equal to the maximum in described preset range, progressively increase the rotating speed of described blower fan, until described pressure difference value is in described preset range; When described pressure difference value is less than or equal to the minimum of a value in described preset range, progressively reduce the rotating speed of described blower fan, until described pressure difference value is in described preset range; When described pressure difference value is in described preset range, control the rotating speed that described blower fan remains current.

Because the rotating speed of blower fan is larger on the pressure difference value impact between compressor high-voltage end and low-pressure end, particularly, in certain scope, the rotating speed of blower fan and the inversely proportional relation of the pressure difference value between compressor high-voltage end and low-pressure end, when therefore can be more than or equal to the maximum in preset range at pressure difference value, progressively increase the rotating speed of blower fan, to reduce pressure difference value; When being less than or equal to the minimum of a value in preset range at pressure difference value, progressively reduce the rotating speed of blower fan, to increase pressure difference value; When pressure difference value is in preset range, controls blower fan and maintain current rotating speed, thus ensure that the high-pressure side of compressor and the pressure difference value of low-pressure end are in suitable scope, guarantee that the circulation of air-conditioner inner refrigerant is smooth and easy, improve the efficiency of air-conditioner.

According to one embodiment of present invention, also comprise: the second detecting unit 208, before detecting the force value of described compressor high-voltage end and the force value of described compressor low-pressure end at described first detecting unit 202, detect the operation duration of environment temperature residing for described off-premises station and/or described compressor; Described first detecting unit 202 specifically for, detect that described environment temperature is less than or equal to predetermined temperature value at described second detecting unit 208, and/or the operation duration of described compressor is when reaching the first scheduled duration, detect the force value of described compressor high-voltage end and the force value of described compressor low-pressure end.

When environment temperature residing for off-premises station is lower, the heat transfer effect of outdoor heat exchanger is relatively better, and larger fluctuation easily appears in the high-pressure side of compressor and the pressure difference value of low-pressure end, therefore can control the rotating speed of blower fan according to above-mentioned pressure difference value.By detecting the operation duration of compressor, and when the operation duration of compressor reaches the first scheduled duration, detect the force value of compressor high-voltage end and the force value of compressor low-pressure end again, make it possible to detect again after compressor operating is stable, avoid the measure error caused because system is unstable.

According to one embodiment of present invention, described control unit 206 also for, when described environment temperature is less than or equal to described predetermined temperature value, set the initial speed of described blower fan according to described environment temperature.

Set the initial speed of described blower fan by environmentally temperature, make air-conditioner have preferably performance upon actuation.

According to one embodiment of present invention, described control unit 206 also for, often through the second scheduled duration, all again control according to the rotating speed of described pressure difference value to described blower fan.

Because indoor and outdoor surroundings temperature is all ceaselessly changing, therefore pass through often through the second scheduled duration, all again control according to the rotating speed of pressure difference value to blower fan, make it possible to the pressure difference value of compressor high-voltage end and low-pressure end to maintain in predetermined scope always, ensure that air-conditioner has preferably performance all the time.

According to one embodiment of present invention, also comprise: setup unit 210, for setting the size of described preset range according to the running frequency of described compressor.

By the size of the running frequency setting preset range according to compressor, make the preset range selected can be adapted to the performance of compressor, and then can guarantee that air-conditioner system has higher efficiency.

Fig. 3 shows the schematic flow sheet of the control method of air-conditioner according to another embodiment of the invention.

As shown in Figure 3, the control method of air-conditioner according to another embodiment of the invention, concrete steps comprise:

Step 302, air-conditioner receives refrigerating operaton signal.Freeze as user can control air-conditioner by remote controller.

Step 304, environment temperature outside sensing chamber also judges that whether outdoor environment temperature is lower than 20 DEG C, if outside temperature is higher than 20 DEG C, then performs step 306; If outside temperature is lower than 20 DEG C, then perform step 308.

Step 306, carries out conventional refrigerating operaton.

Step 308, arranges the initial speed of off-premises station blower fan according to outside environment temperature.Wherein, the initial speed of off-premises station blower fan can be that designer was undertaken setting by theory calculate and experimental verification in the design phase.

In a preferred embodiment, the initial speed of off-premises station blower fan and the relation of outdoor environment temperature can be as shown in table 1, and number range wherein can be comprise large number and do not comprise decimal.

Table 1

Step 310, detects high-pressure side pressure and low-pressure end pressure after compressor normally runs n minute.Wherein, n can set from starting to stable the experienced time according to compressor, can be preferably 5 minutes.

Step 312: according to the instantaneous differential pressure of compressor high-voltage end and low-pressure end, and target differential pressure and corresponding compressor frequency control off-premises station rotation speed of fan.

Particularly, if instantaneous differential pressure-target differential pressure >=0.3MPa, then progressively increase the rotating speed of off-premises station blower fan according to the step value of setting; If instantaneous differential pressure-target differential pressure≤-0.3MPa, then progressively reduce off-premises station rotation speed of fan according to the step value of setting; If if 0.3MPa > instantaneous differential pressure-target differential pressure >-0.3MPa, then keep off-premises station rotating speed.0.3MPa wherein and-0.3MPa can set according to actual conditions.Due to the variable that environment temperature is a transient change, therefore above process can often perform once through certain hour, as often performed once through 1 minute, and off-premises station rotating speed is smaller at low temperatures, therefore adjustment of rotational speed also needs to adjust by a small margin, and preferably, the step value of setting can be 5rpm.

Wherein, target differential pressure can according to the difference of the frequency setting of the characteristic of cold-producing medium and compressor, and this difference is to ensure cold-producing medium proper flow in systems in which, thus ensures refrigerating capacity and efficiency.Wherein, for the compressor of R410a type cold-producing medium, target differential pressure can set according to relation as shown in table 2:

Table 2

The technical scheme of above-described embodiment can ensure indoor refrigeration demand and ensure the reliability of system when domestic air conditioner is freezed under low temperature chamber external environment.

More than be described with reference to the accompanying drawings technical scheme of the present invention, the present invention proposes a kind of control program of new air-conditioner, pressure difference value between compressor high-voltage end and low-pressure end can be controlled in predetermined scope, and then can guarantee that the circulation of air-conditioner inner refrigerant is smooth and easy, be conducive to the efficiency improving air-conditioner.

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (12)

1. a control method for air-conditioner, is characterized in that, described air-conditioner comprises off-premises station, is provided with compressor and outdoor heat exchanger in described off-premises station, and the blower fan for impelling described outdoor heat exchanger to dispel the heat, and the control method of described air-conditioner, comprising:
When described air-conditioner works in a chiller mode, detect the force value of described compressor high-voltage end and the force value of described compressor low-pressure end;
Calculate the pressure difference value between described compressor high-voltage end and described compressor low-pressure end;
Control according to the rotating speed of described pressure difference value to described blower fan, so that described pressure difference value is controlled in preset range.
2. the control method of air-conditioner according to claim 1, is characterized in that, specifically comprises according to the step that the rotating speed of described pressure difference value to described blower fan controls:
When described pressure difference value is more than or equal to the maximum in described preset range, progressively increase the rotating speed of described blower fan, until described pressure difference value is in described preset range;
When described pressure difference value is less than or equal to the minimum of a value in described preset range, progressively reduce the rotating speed of described blower fan, until described pressure difference value is in described preset range;
When described pressure difference value is in described preset range, control the rotating speed that described blower fan remains current.
3. the control method of air-conditioner according to claim 1, is characterized in that, before the step detecting the force value of described compressor high-voltage end and the force value of described compressor low-pressure end, also comprises:
Detect the operation duration of environment temperature residing for described off-premises station and/or described compressor;
Be less than or equal to predetermined temperature value in described environment temperature, and/or when the operation duration of described compressor reaches the first scheduled duration, perform the step detecting the force value of described compressor high-voltage end and the force value of described compressor low-pressure end.
4. the control method of air-conditioner according to claim 3, is characterized in that, when described environment temperature is less than or equal to described predetermined temperature value, also comprises:
The initial speed of described blower fan is set according to described environment temperature.
5. the control method of air-conditioner according to any one of claim 1 to 4, is characterized in that, also comprises:
Often through the second scheduled duration, all again perform the step controlled according to the rotating speed of described pressure difference value to described blower fan.
6. the control method of air-conditioner according to any one of claim 1 to 4, is characterized in that, also comprises: the size setting described preset range according to the running frequency of described compressor.
7. a control device for air-conditioner, is characterized in that, described air-conditioner comprises off-premises station, is provided with compressor and outdoor heat exchanger in described off-premises station, and the blower fan for impelling described outdoor heat exchanger to dispel the heat, and the control device of described air-conditioner, comprising:
First detecting unit, for when described air-conditioner works in a chiller mode, detects the force value of described compressor high-voltage end and the force value of described compressor low-pressure end;
Computing unit, for calculating the pressure difference value between described compressor high-voltage end and described compressor low-pressure end;
Control unit, for controlling according to the rotating speed of described pressure difference value to described blower fan, to control described pressure difference value in preset range.
8. the control device of air-conditioner according to claim 7, is characterized in that, described control unit specifically for:
When described pressure difference value is more than or equal to the maximum in described preset range, progressively increase the rotating speed of described blower fan, until described pressure difference value is in described preset range;
When described pressure difference value is less than or equal to the minimum of a value in described preset range, progressively reduce the rotating speed of described blower fan, until described pressure difference value is in described preset range;
When described pressure difference value is in described preset range, control the rotating speed that described blower fan remains current.
9. the control device of air-conditioner according to claim 7, is characterized in that, also comprises:
Second detecting unit, for detect the force value of described compressor high-voltage end and the force value of described compressor low-pressure end at described first detecting unit before, detects the operation duration of environment temperature residing for described off-premises station and/or described compressor;
Described first detecting unit specifically for, detect that described environment temperature is less than or equal to predetermined temperature value at described second detecting unit, and/or the operation duration of described compressor is when reaching the first scheduled duration, detect the force value of described compressor high-voltage end and the force value of described compressor low-pressure end.
10. the control device of air-conditioner according to claim 9, is characterized in that, described control unit also for, when described environment temperature is less than or equal to described predetermined temperature value, set the initial speed of described blower fan according to described environment temperature.
The control device of 11. air-conditioners according to any one of claim 7 to 10, is characterized in that, described control unit also for, often through the second scheduled duration, all again control according to the rotating speed of described pressure difference value to described blower fan.
The control device of 12. air-conditioners according to any one of claim 7 to 10, is characterized in that, also comprise:
Setup unit, for setting the size of described preset range according to the running frequency of described compressor.
CN201510200836.0A 2015-04-24 2015-04-24 Control method of air conditioner and control device CN104807139A (en)

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CN105042701B (en) * 2015-09-02 2017-12-12 广东美的制冷设备有限公司 Split-floor type air conditioner, explosion prevention controlling process and device
CN105042701A (en) * 2015-09-02 2015-11-11 广东美的制冷设备有限公司 Split floor type air conditioner and anti-explosion control method and device
CN105135622A (en) * 2015-09-15 2015-12-09 广东美的制冷设备有限公司 Control method of household air conditioner and household air conditioner
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CN106403202A (en) * 2016-11-15 2017-02-15 芜湖美智空调设备有限公司 Method and device for reducing dirt retention of air conditioner and air conditioner
CN107062563A (en) * 2017-06-06 2017-08-18 青岛海尔空调电子有限公司 The control method and air-conditioning of air-conditioning air-cooled unit
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CN107467704A (en) * 2017-07-25 2017-12-15 广州能之原科技股份有限公司 A kind of tobacco heat pump dryer alarm for high voltage processing method and system
CN107631431A (en) * 2017-09-25 2018-01-26 珠海格力电器股份有限公司 Air conditioning control method and device
WO2020001091A1 (en) * 2018-06-25 2020-01-02 青岛海尔空调电子有限公司 Method and apparatus for controlling fan rotation speed, and computer readable storage medium
CN109210674A (en) * 2018-08-01 2019-01-15 珠海格力电器股份有限公司 The control method and relevant device of multi-line system outdoor fan
CN109210674B (en) * 2018-08-01 2020-04-24 珠海格力电器股份有限公司 Control method of outdoor fan of multi-split air conditioning system and related equipment
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CN110332670A (en) * 2019-07-16 2019-10-15 珠海格力电器股份有限公司 Compressor control method and control device and coolant system

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