CN104374037A

CN104374037A - Control method and control device of variable frequency air conditioner and variable frequency air conditioner

Info

Publication number: CN104374037A
Application number: CN201310354840.3A
Authority: CN
Inventors: 何振健
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2013-08-14
Filing date: 2013-08-14
Publication date: 2015-02-25
Anticipated expiration: 2033-08-14
Also published as: CN104374037B; WO2015021853A1

Abstract

The invention discloses a control method of a variable frequency air conditioner, when the dehumidification operation is determined not to be needed, if the temperature of the pipe temperature of an evaporator is higher than the dew point temperature of indoor air, a compressor is controlled to maintain the current frequency, and if the temperature of the pipe temperature of the evaporator is not higher than the dew point temperature of the indoor air, the frequency of the compressor is reduced on the premise that the frequency reduction of the compressor is allowed, so that the temperature of the pipe temperature of the evaporator is improved, and the dehumidification capacity of the variable frequency air conditioner is reduced; when the dehumidification operation is determined to be needed, the running frequency of the compressor is controlled by comparing the temperature of the pipe temperature of the evaporator with the dew point temperature of the indoor air, so that the variable frequency air conditioner dehumidifies while cooling. The control method of the variable frequency air conditioner disclosed by the invention can adjust the humidity of indoor air, and reduce the dehumidification capacity of the air conditioner and the energy consumption of a system by reducing the operating frequency of the compressor when the dehumidification operation is not needed. The invention also discloses a control device of the variable frequency air conditioner and the variable frequency air conditioner.

Description

A kind of control method of convertible frequency air-conditioner, control device and convertible frequency air-conditioner

Technical field

The invention belongs to electric equipment control technology field, particularly relate to a kind of control method of convertible frequency air-conditioner, control device and convertible frequency air-conditioner.

Background technology

Increasing convertible frequency air-conditioner appears in the life of people now.Existing air conditioning control method, carry out refrigeration control according to the design temperature of air-conditioning, when difference between the environment temperature and design temperature of indoor is larger, improve the frequency of the compressor of convertible frequency air-conditioner, when difference between the environment temperature and design temperature of indoor is less, reduce the frequency of the compressor of convertible frequency air-conditioner.

But, according to existing control method, there will be the situation that the evaporator tube temperature of convertible frequency air-conditioner is too low.When dew-point temperature lower than water vapor in air of the Guan Wen of evaporimeter, steam will be condensed into water, part cold (this part cold is called the latent heat load of air-conditioning) can be consumed in water vapor condensation process, thus increase the energy consumption of system, the pipe Wen Wendu of evaporimeter is lower, and the latent heat load of air-conditioning is larger.In addition, when after the long-time refrigerating operaton of convertible frequency air-conditioner, indoor air humidity can be caused to decline, make user produce sense of discomfort.

Therefore, how realizing the adjustment of indoor air humidity and reduce system energy consumption, is those skilled in the art's problem demanding prompt solutions.

Summary of the invention

In view of this, the object of the present invention is to provide a kind of control method of convertible frequency air-conditioner, the humidity of room air can be regulated, and reduce the system energy consumption of convertible frequency air-conditioner.

For achieving the above object, the invention provides following technical scheme:

The invention discloses a kind of control method of convertible frequency air-conditioner, comprising:

When meeting first and being pre-conditioned, judge that current indoor environment is the need of carrying out dehumidification treatments;

When determining not need to carry out dehumidification treatments, in the first duration, performing independent refrigerating operation, returning execution afterwards and judging that current indoor environment is the need of the step of carrying out dehumidification treatments, performs independent refrigerating operation, comprising:

Obtain the pipe Wen Wendu of evaporimeter and the dew-point temperature of room air;

When described pipe Wen Wendu is not higher than described dew-point temperature, if the current running frequency of compressor is low-limit frequency, then control described compressor maintenance ongoing frequency and run the second duration, return the step performing and obtain the pipe Wen Wendu of evaporimeter and the dew-point temperature of room air, if the current running frequency of compressor is not low-limit frequency, then control described compressor reduce frequency and run the 3rd duration, return the step performing and obtain the pipe Wen Wendu of evaporimeter and the dew-point temperature of room air;

When described pipe Wen Wendu is higher than described dew-point temperature, controls described compressor maintenance ongoing frequency and run the second duration, return the step performing and obtain the pipe Wen Wendu of evaporimeter and the dew-point temperature of room air;

When determining to need to carry out dehumidification operation, perform following steps:

When described pipe Wen Wendu is higher than described dew-point temperature, if the current running frequency of compressor is highest frequency, control described compressor and maintain ongoing frequency operation the 4th duration, return to perform and judge that current indoor environment is the need of the step of carrying out dehumidification treatments, if the current running frequency of compressor is not highest frequency, then control described compressor improve frequency and run the 5th duration, if control compressor afterwards to carry high-frequency number of times more than first number, then return the step performing and determine the pipe Wen Wendu of evaporimeter and the dew-point temperature of room air, otherwise, return to perform and judge that current indoor environment is the need of the step of carrying out dehumidification treatments,

When described pipe Wen Wendu is not higher than described dew-point temperature, controls described compressor and maintain ongoing frequency operation the 4th duration, return execution and judge that current indoor environment is the need of the step of carrying out dehumidification treatments.

Preferably, in above-mentioned control method, described judgement current indoor environment, the need of carrying out dehumidification treatments, comprising:

Determine water capacity and the target moisture content of current indoor air;

When the water capacity of current indoor air is not more than target moisture content, determine not need to carry out dehumidification treatments;

When the water capacity of current indoor air is greater than target moisture content, determine relative humidity and the setting humidity of current indoor air, when described relative humidity is greater than described setting humidity, determine to need to carry out dehumidification treatments, when described relative humidity is not more than described setting humidity, determine not need to carry out dehumidification treatments.

Preferably, the off-premises station motor of convertible frequency air-conditioner is direct current generator, in above-mentioned control method, performs in the process of independent refrigerating operation, when described pipe Wen Wendu is not higher than described dew-point temperature, also comprises:

Obtain detected temperatures and the outdoor condenser temperature of off-premises station environment temperature-sensitive bag;

Judge whether the difference between the detected temperatures of off-premises station environment temperature-sensitive bag and outdoor condenser temperature is less than the first temperature approach;

When described difference is more than or equal to described first temperature approach, controls described direct current generator and maintain the operation of current rotating speed, after continuing the 6th duration, return and perform the detected temperatures of acquisition off-premises station environment temperature-sensitive bag and the step of outdoor condenser temperature;

When described difference is less than described first temperature approach, if the current rotating speed of described direct current generator is not minimum speed, then control described direct current generator and reduce rotating speed, after continuing the 7th duration, return to perform and obtain the detected temperatures of off-premises station environment temperature-sensitive bag and the step of outdoor condenser temperature, if the current rotating speed of described direct current generator is minimum speed, then control described direct current generator and maintain the operation of current rotating speed, after continuing the 6th duration, return and perform the detected temperatures of acquisition off-premises station environment temperature-sensitive bag and the step of outdoor condenser temperature.

Preferably, the off-premises station motor of convertible frequency air-conditioner is direct current generator, in above-mentioned control method, when determining to need to carry out dehumidification operation, when described pipe Wen Wendu is higher than described dew-point temperature, also comprises:

Judge whether the difference between the detected temperatures of off-premises station environment temperature-sensitive bag and outdoor condenser temperature is less than or equal to the second temperature approach;

When described difference is less than or equal to described second temperature approach, controls described direct current generator and maintain current rotation speed operation, after continuing the 8th duration, return execution and judge that current indoor environment is the need of the step of carrying out dehumidification treatments;

When described difference is greater than described second temperature approach, if the current rotating speed of described direct current generator is maximum speed, then control described direct current generator and maintain the operation of current rotating speed, after continuing the 8th duration, return to perform and judge that current indoor environment is the need of the step of carrying out dehumidification treatments, if the current rotating speed of described direct current generator is not maximum speed, then control described direct current generator and improve rotating speed, after continuing the 9th duration, if control direct current generator to carry high-revolving number of times more than second number, then return the step performing and obtain the pipe Wen Wendu of evaporimeter and the dew-point temperature of room air, otherwise, return to perform and judge that current indoor environment is the need of the step of carrying out dehumidification treatments.

Preferably, in above-mentioned control method, the described first pre-conditioned difference between indoor environment temperature and design temperature is less than the 3rd temperature difference;

When difference between indoor environment temperature and design temperature is less than the 3rd temperature difference, performs and judge that current indoor environment is the need of the step of carrying out dehumidification treatments.

On the other hand, the invention also discloses a kind of control device of convertible frequency air-conditioner, comprising:

Judging unit, for when meeting first and being pre-conditioned, judges that current indoor environment is the need of carrying out dehumidification treatments;

First control unit, for when determining not need to carry out dehumidification treatments, performs independent refrigerating operation in the first duration, triggers the execution of described judging unit afterwards and judges that current indoor environment is the need of the operation carrying out dehumidification treatments; Described first control unit comprises the first data acquisition subelement, first and controls subelement and the second control subelement;

Described first data acquisition subelement is used for when determining not need to carry out dehumidification treatments, obtains the pipe Wen Wendu of evaporimeter and the dew-point temperature of room air;

Described first control subelement described pipe Wen Wendu not higher than described dew-point temperature and the current running frequency of compressor is low-limit frequency time, control described compressor maintenance ongoing frequency and run the second duration, trigger described first data acquisition subelement afterwards and perform the operation obtaining the pipe Wen Wendu of evaporimeter and the dew-point temperature of room air, described pipe Wen Wendu not higher than described dew-point temperature and the current running frequency of compressor is not low-limit frequency time, control described compressor reduce frequency and run the 3rd duration, trigger described first data acquisition subelement afterwards and perform the operation obtaining the pipe Wen Wendu of evaporimeter and the dew-point temperature of room air,

Described second controls subelement when described pipe Wen Wendu is higher than described dew-point temperature, control described compressor maintenance ongoing frequency and run the second duration, trigger described first data acquisition subelement afterwards and perform the operation obtaining the pipe Wen Wendu of evaporimeter and the dew-point temperature of room air;

Second control unit, for when determining to need to carry out dehumidification treatments, carries out dehumidification operation; Described second control unit comprises the second data acquisition subelement, the 3rd and controls subelement and the 4th control subelement;

Described second data acquisition subelement is used for when determining to need to carry out dehumidification treatments, obtains the pipe Wen Wendu of evaporimeter and the dew-point temperature of room air;

Described 3rd control subelement described pipe Wen Wendu higher than described dew-point temperature and the current running frequency of compressor is highest frequency time, control described compressor and maintain ongoing frequency operation the 4th duration, trigger the execution of described judging unit afterwards and judge that current indoor environment is the need of the operation carrying out dehumidification treatments, described 3rd control subelement described pipe Wen Wendu higher than described dew-point temperature and the current running frequency of compressor is not highest frequency time, control described compressor improve frequency and run the 5th duration, if control compressor to carry high-frequency number of times more than first number, then trigger described second data acquisition subelement and perform the operation determining the pipe Wen Wendu of evaporimeter and the dew-point temperature of room air, otherwise, trigger the execution of described judging unit and judge that current indoor environment is the need of the operation carrying out dehumidification treatments,

Described 4th controls subelement is used for when described pipe Wen Wendu is not higher than described dew-point temperature, control described compressor and maintain ongoing frequency operation the 4th duration, trigger the execution of described judging unit afterwards and judge that current indoor environment is the need of the operation carrying out dehumidification treatments.

Preferably, in above-mentioned control device, described judging unit comprises the first judgment sub-unit, and described first judgment sub-unit is for judging that current indoor environment is the need of carrying out dehumidification treatments, and described first judgment sub-unit comprises:

Water capacity determination module, for determining water capacity and the target moisture content of current indoor air;

First processing module, for when the water capacity of current indoor air is not more than target moisture content, determines not need to carry out dehumidification treatments;

Second processing module, for when the water capacity of current indoor air is greater than target moisture content, determine relative humidity and the setting humidity of current indoor air, when described relative humidity is greater than described setting humidity, determine to need to carry out dehumidification treatments, when described relative humidity is not more than described setting humidity, determine not need to carry out dehumidification treatments.

Preferably, the off-premises station motor of convertible frequency air-conditioner is direct current generator, and in above-mentioned control device, described first control unit also comprises:

3rd data acquisition subelement, for when described pipe Wen Wendu is not higher than described dew-point temperature, obtains detected temperatures and the outdoor condenser temperature of off-premises station environment temperature-sensitive bag;

First judgment sub-unit, for judging whether the difference between the detected temperatures of off-premises station environment temperature-sensitive bag and outdoor condenser temperature is less than the first temperature approach;

5th controls subelement, for when described difference is more than or equal to described first temperature approach, control described direct current generator and maintain the operation of current rotating speed, after continuing the 6th duration, trigger described 3rd data acquisition subelement and perform the detected temperatures of acquisition off-premises station environment temperature-sensitive bag and the operation of outdoor condenser temperature;

6th controls subelement, for be less than described first temperature approach in described difference and the current rotating speed of described direct current generator is not minimum speed time, control described direct current generator and reduce rotating speed, after continuing the 7th duration, trigger described 3rd data acquisition subelement and perform the detected temperatures of acquisition off-premises station environment temperature-sensitive bag and the operation of outdoor condenser temperature, when described difference is less than described first temperature approach and the current rotating speed of described direct current generator is minimum speed, control described direct current generator and maintain the operation of current rotating speed, after continuing the 6th duration, trigger described 3rd data acquisition subelement and perform the detected temperatures of acquisition off-premises station environment temperature-sensitive bag and the operation of outdoor condenser temperature.

Preferably, the off-premises station motor of convertible frequency air-conditioner is direct current generator, and in above-mentioned control device, described second control unit also comprises:

4th data acquisition subelement, for when described pipe Wen Wendu is higher than described dew-point temperature, obtains detected temperatures and the outdoor condenser temperature of off-premises station environment temperature-sensitive bag;

Second judgment sub-unit, for judging whether the difference between the detected temperatures of described off-premises station environment temperature-sensitive bag and outdoor condenser temperature is less than or equal to the second temperature approach;

7th controls subelement, for when described difference is less than or equal to described second temperature approach, control described direct current generator and maintain current rotation speed operation, after continuing the 8th duration, trigger the execution of described judging unit and judge that current indoor environment is the need of the operation carrying out dehumidification treatments;

8th controls subelement, for be greater than described second temperature approach in described difference and the current rotating speed of described direct current generator is maximum speed time, control described direct current generator and maintain the operation of current rotating speed, after continuing the 8th duration, trigger the execution of described judging unit and judge that current indoor environment is the need of the operation carrying out dehumidification treatments, when described difference is greater than described second temperature approach and the current rotating speed of described direct current generator is not maximum speed, control described direct current generator and improve rotating speed, after continuing the 9th duration, if control direct current generator to carry high-revolving number of times more than second number, then trigger described second data acquisition subelement and perform the operation obtaining the pipe Wen Wendu of evaporimeter and the dew-point temperature of room air, otherwise, trigger the execution of described judging unit and judge that current indoor environment is the need of the operation carrying out dehumidification treatments.

On the other hand, the invention also discloses a kind of convertible frequency air-conditioner, comprise indoor set and off-premises station, the motor in described off-premises station is direct current generator, also comprises any one control device above-mentioned.

As can be seen here, beneficial effect of the present invention is: the control method of convertible frequency air-conditioner disclosed by the invention, when meeting first and being pre-conditioned, first judges that current indoor environment is the need of carrying out dehumidification operation; When determining not need to carry out dehumidification operation, if the pipe Wen Wendu of evaporimeter is higher than the dew-point temperature of room air, then can not produce condensed water (namely not carrying out dehumidification operation), now control compressor and maintain ongoing frequency continuation operation, if the pipe Wen Wendu of evaporimeter is less than or equal to the dew-point temperature of room air, now allow the prerequisite of frequency reducing at compressor under, reduce the frequency of compressor, thus improve the pipe Wen Wendu of evaporimeter, reduce the generation (namely reducing the dehumidifying effect of convertible frequency air-conditioner) of condensed water; When determining to need to carry out dehumidification operation, if the pipe Wen Wendu of evaporimeter is less than or equal to the dew-point temperature of room air, control compressor and maintain ongoing frequency continuation operation, convertible frequency air-conditioner dehumidifies while refrigeration cool-down, if the pipe Wen Wendu of evaporimeter is higher than the dew-point temperature of room air, now allow the prerequisite of raising frequency at compressor under, improve the frequency of compressor, thus reduce the pipe Wen Wendu of evaporimeter, improve the dehumidifying effect of convertible frequency air-conditioner.The control method of convertible frequency air-conditioner disclosed by the invention, can regulate the humidity of room air, and when not needing dehumidification operation, being reduced the dehumidifying effect of air-conditioning, reduce system energy consumption by the running frequency reducing compressor.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

Fig. 1 is the flow chart of the control method of a kind of convertible frequency air-conditioner disclosed by the invention;

Fig. 2 is the flow chart of a kind of separate refrigeration operation disclosed by the invention;

Fig. 3 disclosed by the inventionly a kind ofly judges that current indoor environment is the need of the flow chart carrying out dehumidification treatments;

Fig. 4 is the flow chart of another kind of separate refrigeration operation disclosed by the invention;

Fig. 5 carries out in dehumidification treatments process the flow chart that direct current generator controls;

Fig. 6 is the structural representation of the control device of a kind of convertible frequency air-conditioner disclosed by the invention;

Fig. 7 is the another kind of structural representation of the first control unit in the present invention;

Fig. 8 is the another kind of structural representation of the second control unit in the present invention.

Detailed description of the invention

The invention discloses a kind of control method of convertible frequency air-conditioner, the humidity of room air can be regulated, and reduce the system energy consumption of convertible frequency air-conditioner.

The control method of frequency converter disclosed by the invention comprises:

When pipe Wen Wendu is not higher than dew-point temperature, if the current running frequency of compressor is low-limit frequency, then control compressor maintenance ongoing frequency and run the second duration, return the step performing and obtain the pipe Wen Wendu of evaporimeter and the dew-point temperature of room air, if the current running frequency of compressor is not low-limit frequency, then control compressor reduce frequency and run the 3rd duration, return the step performing and obtain the pipe Wen Wendu of evaporimeter and the dew-point temperature of room air;

When pipe Wen Wendu is higher than dew-point temperature, controls compressor maintenance ongoing frequency and run the second duration, return the step performing and obtain the pipe Wen Wendu of evaporimeter and the dew-point temperature of room air;

When pipe Wen Wendu is higher than dew-point temperature, if the current running frequency of compressor is highest frequency, control compressor and maintain ongoing frequency operation the 4th duration, return to perform and judge that current indoor environment is the need of the step of carrying out dehumidification treatments, if the current running frequency of compressor is not highest frequency, then control compressor improve frequency and run the 5th duration, if control compressor afterwards to carry high-frequency number of times more than first number, then return the step performing and determine the pipe Wen Wendu of evaporimeter and the dew-point temperature of room air, otherwise, return to perform and judge that current indoor environment is the need of the step of carrying out dehumidification treatments,

When pipe Wen Wendu is not higher than dew-point temperature, controls compressor and maintain ongoing frequency operation the 4th duration, return execution and judge that current indoor environment is the need of the step of carrying out dehumidification treatments.

For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.

It is the flow chart of the control method of a kind of convertible frequency air-conditioner disclosed by the invention see Fig. 1, Fig. 1.This control method comprises:

Step S1: when meeting first and being pre-conditioned, judge that current indoor environment is the need of carrying out dehumidification treatments, when determining not need to carry out dehumidification treatments, performs step S2, when determining to need to carry out dehumidification treatments, performs step S31.

Step S2: perform independent refrigerating operation in the first duration, returns afterwards and performs step S1.The process performing independent refrigerating operation as shown in Figure 2, comprising:

Step S21: obtain the pipe Wen Wendu of evaporimeter and the dew-point temperature of room air.

The evaporimeter of convertible frequency air-conditioner has temperature temperature-sensitive bag, in addition, convertible frequency air-conditioner be also configured with do for sensing chamber's environment, the wet and dry bulb temperature sensor of wet-bulb temperature.In enforcement, the control device of convertible frequency air-conditioner obtains the pipe Wen Wendu of evaporimeter from the temperature temperature-sensitive bag of evaporimeter, obtain dry-bulb temperature and the wet-bulb temperature of room air, and calculate the dew-point temperature of room air accordingly from wet and dry bulb temperature sensor.

Step S22: judge that the pipe Wen Wendu of evaporimeter is whether higher than the dew-point temperature of room air, if so, then performs step S23, otherwise performs step S24.

Step S23: control compressor maintenance ongoing frequency and run the second duration, return and perform step S21.

When dew-point temperature higher than room air of the pipe Wen Wendu of evaporimeter, cannot condensed water be formed in room air and evaporimeter generation heat exchanging process, and be only transfer heat to evaporimeter to cause air themperature to decline.Now, control compressor and maintain ongoing frequency and run, after continuous service second duration, again obtain the pipe Wen Wendu of evaporimeter and the dew-point temperature of room air and judge.

Step S24: judge whether the current running frequency of compressor is low-limit frequency, if so, then perform step S23, otherwise perform step S25.

Step S25: control compressor and reduce frequency and run the 3rd duration, return and perform step S21.

When dew-point temperature less than or equal to room air of the pipe Wen Wendu of evaporimeter, release heat when room air and evaporimeter contact heat-exchanging, air themperature is reduced, but when room air reaches dew-point temperature, still the temperature difference is there is with evaporator temperature, therefore analyse in continuation exothermic process simultaneously disengage condensed water

Air-conditioning is made to produce effect on moisture extraction while refrigeration cool-down.

Generally the running frequency of compressor is higher, and evaporator tube Wen Wendu is lower, but not necessarily with refrigeration (cooling) effect proportional relation.See table 1, certain 72 frequency conversion cabinet-type air conditioner is when following operating mode is run, and the cooling-down effect that 62Hz runs obviously is better than 74Hz cooling-down effect.

Table 1

Therefore, the refrigeration cool-down effect of convertible frequency air-conditioner can not directly and the proportional relation of the height of compressor operating frequency, but when other specified criterias are constant, the running frequency of compressor is lower, the pipe Wen Wendu of evaporimeter is higher, its dehumidifying effect is more weak, therefore controls compressor and performs frequency reducing operation and can realize few dehumidifying and even not dehumidify the effect of separate refrigeration.

In addition, the compressor of convertible frequency air-conditioner all has the range of operation of clear stipulaties, and as frequency range, temperature range, pressure limit etc., these all have clear stipulaties in compressor specifications.When compressor runs under different temperatures same frequency, the pressure of compressor is different.Therefore, corresponding different temperature and pressure, the running frequency scope of compressor is also different.

In enforcement, just can determine the running frequency scope of compressor according to the corresponding relation between the running frequency scope of temperature, pressure and compressor.In addition, also can go according to the efficiency of compressor operating the frequency range limiting compressor operating, make it in the scope that efficiency comparison is high, go running.When the running frequency that compressor is current is not the low-limit frequency within the scope of compressor frequency, compressor can be controlled and carry out frequency reducing operation.

When determining the dew-point temperature of the pipe Wen Wendu of evaporimeter less than or equal to room air, judge whether compressor can also carry out frequency reducing operation, if can frequency reducing operation be carried out, then reduce the running frequency of compressor, thus improve the pipe Wen Wendu of evaporimeter, reduce the dehumidifying effect of air-conditioning, realize few dehumidifying and even not dehumidify the effect of separate refrigeration.

In enforcement, the frequency reducing compressor can be: the difference calculating compressor ongoing frequency and frequency increment, when this difference is greater than the minimum frequency of compressor permission, control compressor to run with this difference, when this difference is less than or equal to the minimum frequency of compressor permission, control compressor to run with minimum frequency, namely control compressor with one larger in this difference and minimum frequency operation.

Step S31: obtain the pipe Wen Wendu of evaporimeter and the dew-point temperature of room air.

Step S32: judge that the pipe Wen Wendu of evaporimeter is whether higher than the dew-point temperature of room air, if so, then performs step S34, otherwise performs step S33.

Step S33: control compressor and maintain ongoing frequency operation the 4th duration, return and perform step S1.

When dew-point temperature less than or equal to room air of the pipe Wen Wendu of evaporimeter, release heat when room air and evaporimeter contact heat-exchanging, air themperature is reduced, but when room air reaches dew-point temperature, still the temperature difference is there is with evaporator temperature, therefore analyse in continuation exothermic process simultaneously disengage condensed water, make air-conditioning produce effect on moisture extraction while refrigeration cool-down.

Step S34: judge whether the current running frequency of compressor is highest frequency, if so, then perform step S33, otherwise perform step S35.

Step S35: control compressor and improve frequency and run the 5th duration, perform step S36.

When dew-point temperature higher than room air of the pipe Wen Wendu of evaporimeter, cannot condensed water be formed in room air and evaporimeter generation heat exchanging process, and be only transfer heat to evaporimeter to cause air themperature to decline.Now, judge whether compressor can carry out raising frequency operation, if can carry out raising frequency operation, then improves the running frequency of compressor, thus reduce the pipe Wen Wendu of evaporimeter, improve the dehumidifying effect of air-conditioning.

In enforcement, improving the frequency of compressor can be: calculate compressor ongoing frequency and frequency increment and value, when this and value are less than the peak frequency of compressor permission, control compressor to run with this and value, when this and value are more than or equal to the peak frequency of compressor permission, control compressor to run with peak frequency, namely control compressor with an operation less in this and value and peak frequency.

This frequency increment is preferably set to less numerical value, now the compressor frequency that at every turn can improve is less, by performing the operation repeatedly improving compressor frequency, finally can ensure that convertible frequency air-conditioner carries out dehumidification treatments, and the situation that there will not be the frequency of compressor too high, thus the energy avoiding compressor consumption too much.

Step S36: judge that whether control compressor carries high-frequency number of times more than first number, if so, then performs step S1, otherwise performs step S31.

The control method of convertible frequency air-conditioner disclosed by the invention, when meeting first and being pre-conditioned, first judges that current indoor environment is the need of carrying out dehumidification operation; When determining not need to carry out dehumidification operation, if the pipe Wen Wendu of evaporimeter is higher than the dew-point temperature of room air, then can not produce condensed water (namely not carrying out dehumidification operation), now control compressor and maintain ongoing frequency continuation operation, if the pipe Wen Wendu of evaporimeter is less than or equal to the dew-point temperature of steam, now allow the prerequisite of frequency reducing at compressor under, reduce the frequency of compressor, thus improve the pipe Wen Wendu of evaporimeter, reduce the generation (namely reducing the dehumidifying effect of convertible frequency air-conditioner) of condensed water; When determining to need to carry out dehumidification operation, if the pipe Wen Wendu of evaporimeter is less than or equal to the dew-point temperature of room air, control compressor and maintain ongoing frequency continuation operation, convertible frequency air-conditioner dehumidifies while refrigeration cool-down, if the pipe Wen Wendu of evaporimeter is higher than the dew-point temperature of room air, now allow the prerequisite of raising frequency at compressor under, improve the frequency of compressor, thus reduce the pipe Wen Wendu of evaporimeter, improve the dehumidifying effect of convertible frequency air-conditioner.The control method of convertible frequency air-conditioner disclosed by the invention, can regulate the humidity of room air, and when not needing dehumidification operation, being reduced the dehumidifying effect of air-conditioning, reduce system energy consumption by the running frequency reducing compressor.

In enforcement, judge that current indoor environment is the need of carrying out dehumidification treatments, can realize in the following manner: judge the instruction type received, when the instruction received is separate refrigeration operational order, determine not need to carry out dehumidification treatments, when the instruction received is temperature and humidity regulation instruction, determine to need to carry out dehumidification treatments.

Certainly, judge that current indoor environment is the need of carrying out dehumidification treatments, can also adopt other modes, Fig. 3 shows and a kind ofly judges that current indoor environment is the need of the flow process of carrying out dehumidification treatments.Comprise:

Step S11: water capacity and the target moisture content of determining current indoor air.

The control device of convertible frequency air-conditioner obtains dry-bulb temperature and the wet-bulb temperature of room air from wet and dry bulb temperature sensor, and calculates the water capacity of current indoor air accordingly.Target moisture content can be the water capacity that target humidity is corresponding.Target humidity is inputted by control panel or remote controller by user.

Step S12: judge whether the water capacity of current indoor air is greater than target moisture content, if so, then performs step S14, otherwise, perform step S13.

Step S13: determine not need to carry out dehumidification treatments;

Step S14: relative humidity and the setting humidity of determining current indoor air.

Step S15: judge whether the relative humidity of current indoor air is greater than setting humidity, if so, then performs step S16, otherwise, perform step S13.

Step S16: determine to need to carry out dehumidification treatments.

When the water capacity of current indoor air is less than or equal to target moisture content, determine not need to carry out dehumidification treatments.But when the water capacity of current indoor air is greater than target moisture content, the relative humidity of room air also might not be greater than setting humidity (setting humidity is the target humidity that user is inputted by remote controller or control panel), therefore, compare relative humidity and the setting humidity of current indoor air further, only when the relative humidity of current indoor air is greater than setting humidity, just determine to need to carry out dehumidification treatments.

Fig. 3 is disclosed judges that current indoor environment is the need of the method for carrying out dehumidification treatments, the dry-bulb temperature of the room air got according to wet and dry bulb temperature sensor and wet-bulb temperature, calculate water capacity and the relative humidity of current indoor air, by with target moisture content and the comparison setting humidity, determine that room air is the need of carrying out dehumidification treatments.

Preferably, water capacity corresponding for target humidity and water capacity corrected parameter sum are defined as target moisture content, and water capacity corrected parameter can be 0.5g/kg, can certainly be set to other numerical value.If water capacity corresponding for target humidity is defined as target humidity, when performing step S35, control compressor improve frequency and run the 5th duration (as 10 minutes), may in this running, reach the water capacity corresponding to water capacity≤target moisture content of current indoor air, thus cause dehumidifying excessively.When target moisture content is the water capacity and water capacity corrected parameter sum that target humidity is corresponding, can avoid occurring the excessive problem that dehumidifies.

When the off-premises station motor in convertible frequency air-conditioner is direct current generator, performs independent refrigerating operation in step S2 and can also adopt other modes.It is the flow chart of the method for another kind of separate refrigeration operation disclosed by the invention see Fig. 4, Fig. 4.Comprise:

Step S22: judge that the pipe Wen Wendu of evaporimeter is whether higher than the dew-point temperature of room air, if so, then performs step S23, otherwise performs step S24 and step S26.

Step S26: the detected temperatures and the outdoor condenser temperature that obtain off-premises station environment temperature-sensitive bag.

Step S27: judge whether the difference between the detected temperatures of off-premises station environment temperature-sensitive bag and outdoor condenser temperature is less than the first temperature approach, if so, then performs step S29, otherwise performs step S28.

Step S28: control direct current generator and maintain the operation of current rotating speed, after continuing the 6th duration, perform step S26.

Step S29: judge whether the current rotating speed of direct current generator is minimum speed, if so, then perform step S28, otherwise perform step S210.

Step S210: control direct current generator and reduce rotating speed, after continuing the 7th duration, performs step S26.

T _{outer tube-outer shroud}represent the detected temperatures T of off-premises station environment temperature-sensitive bag _{outer shroud temperature}with outdoor condenser temperature T _cold _{condenser temperature}between difference, i.e. T _{outer tube-outer shroud}=T _{condenser temperature}-T _{outer shroud temperature}, A1 is first temperature approach (being recommended in 1 ~ 5 DEG C of scope) of setting.Work as T _{outer tube-outer shroud}time less, illustrate that outdoor condensing heat-exchange effect is better, and it indirectly affects the refrigeration of indoor evaporator: when other conditions are the same, work as T _{outer tube-outer shroud}hour, the refrigeration of indoor evaporator is better than works as T _{outer tube-outer shroud}refrigeration time larger.If certain type is at same frequency (70Hz), identical air quantity (1100m ³/ h), under identical nominal cooling condition (27 DEG C/19 DEG C, 35 DEG C/24 DEG C), outer blower fan runs with 800rpm and 750rpm respectively, and its leaving air temp is respectively 12.3 DEG C and 12.8 DEG C, the outdoor pipe Wen Wendu of correspondence is respectively 39.6 DEG C and 41 DEG C.

When difference between the detected temperatures and outdoor condenser temperature of off-premises station environment temperature-sensitive bag is less than the first temperature approach, thinks that the heat exchange of outdoor heat exchanger is better, now still allow direct current generator to reduce rotating speed.If the current rotating speed of direct current generator is not minimum speed, the rotating speed of direct current generator can be reduced, thus reduce the noise of convertible frequency air-conditioner, improve user in comfortableness acoustically.

In enforcement, the rotating speed reducing direct current generator can be: the difference calculating the current rotating speed of direct current generator and incremental speed, when this difference is greater than the minimum speed of direct current generator permission, control direct current generator to run with this difference, when this and value are less than or equal to the minimum speed of direct current generator permission, control direct current generator to run with minimum speed, namely control direct current generator with one larger in this difference and minimum speed operation.

Be a progressive process to the control of direct current generator, be conducive to the reliability and stability ensureing system cloud gray model.Otherwise such as outer rotation speed of fan is directly directly reduced to 500rpm from 800rpm, this can make the rapid drawdown of outdoor heat exchange air quantity, and easily cause pressure at expulsion, delivery temperature to occur significantly rising, compressor load increase is too fast easily causes the system failures such as compressor.

When the rotating speed that direct current generator is current is minimum speed, step S26 and S27 is again performed after maintaining operation the 6th duration, its object is to: whether detect along with the change of operating mode, the minimum speed of direct current generator upgrades in program, judges whether direct current generator is in additional controllable state.

Based on the method performing independent refrigerating operation another kind of disclosed in Fig. 4, do not affect convertible frequency air-conditioner dehumidify less even do not dehumidify separate refrigeration prerequisite under, the rotating speed of direct current generator can be reduced further, thus reduce system energy consumption further, and reduce the noise that direct current generator sends, improve family in comfortableness acoustically.

In addition, when in convertible frequency air-conditioner, off-premises station motor is direct current generator, in the control method shown in Fig. 1, when performing step S32 and determining the dew-point temperature of the pipe Wen Wendu of evaporimeter higher than room air, except performing existing step S34 and subsequent step, can also comprise the following steps (as shown in Figure 5):

Step S37: the detected temperatures and the outdoor condenser temperature that obtain off-premises station environment temperature-sensitive bag.

Step S38: judge whether the difference between the detected temperatures of off-premises station environment temperature-sensitive bag and outdoor condenser temperature is less than or equal to the second temperature approach, if so, then performs step S39, otherwise performs step S310.

Step S39: control direct current generator and maintain current rotation speed operation, after continuing the 8th duration, returns and performs step S1.

Step S310: judge whether the current rotating speed of direct current generator is maximum speed, if so, then perform step S39, otherwise perform step S311.

Step S311: control direct current generator and improve rotating speed, after continuing the 9th duration, performs step S312.

Step S312: judge that whether control direct current generator carries high-revolving number of times more than second number, if exceed, then performs step S1, otherwise performs step S31.

When difference between the detected temperatures and outdoor condenser temperature of off-premises station environment temperature-sensitive bag is greater than the second temperature approach, think that the heat exchange of outdoor heat exchanger is poor, now need the rotating speed improving direct current generator.When difference between the detected temperatures and outdoor condenser temperature of off-premises station environment temperature-sensitive bag is less than or equal to the second temperature gap, direct current generator still keeps current rotating speed to run.

In enforcement, improving the rotating speed of direct current generator can be: calculate the current rotating speed of direct current generator and incremental speed and value, when this and value are less than the maximum (top) speed of direct current generator permission, control direct current generator to run with this and value, when this and value are more than or equal to the maximum (top) speed of direct current generator permission, control direct current generator to run with maximum (top) speed, namely control direct current generator with one less in this difference and maximum (top) speed operation.

This incremental speed is preferably set to less numerical value, now the direct current generator rotating speed that at every turn can improve is less, by performing the operation repeatedly improving DC motor speed, finally can ensure that outdoor heat exchanger has good heat transfer effect, and the situation that there will not be the rotating speed of direct current generator too high, thus avoid direct current generator to produce too much noise, consume the too much energy.

State in disclosed control method on the invention, first pre-conditionedly can be: the time of opening convertible frequency air-conditioner reaches Preset Time.Namely, after unlatching air-conditioning, starting timing, when clocking value reaches Preset Time, judging that current indoor environment is the need of carrying out dehumidification treatments.

In addition, this first pre-conditionedly can also be: the difference between indoor environment temperature and design temperature is less than the 3rd temperature difference.After refrigeration start runs, start to detect indoor environment temperature and design temperature, and the difference calculated between the two, when this difference is greater than the 3rd temperature difference (as 4 DEG C), convertible frequency air-conditioner freezes according to the requirement of fast-refrigerating, now compressor is in high frequency running status, when this difference is less than or equal to the 3rd temperature difference, then judges that current indoor environment is the need of carrying out dehumidification treatments.Can ensure that convertible frequency air-conditioner reaches the effect of fast cooling after power-up like this.

The control method of the above disclosed convertible frequency air-conditioner of the present invention, accordingly, the present invention also discloses the control device of convertible frequency air-conditioner, to realize this control method.It is the structural representation of the control device of a kind of convertible frequency air-conditioner disclosed by the invention see Fig. 6, Fig. 6.This control device comprises judging unit 100, first control unit 200 and the second control unit 300.

Wherein:

Judging unit 100, for when meeting first and being pre-conditioned, judges that current indoor environment is the need of carrying out dehumidification treatments.

First control unit 200, for when determining not need to carry out dehumidification treatments, performs independent refrigerating operation in the first duration, triggers judging unit 100 execution afterwards and judges that current indoor environment is the need of the operation carrying out dehumidification treatments.First control unit 200 comprises the first data acquisition subelement 201, first and controls subelement 202 and the second control subelement 203.Wherein:

First data acquisition subelement 201, for when determining not need to carry out dehumidification treatments, obtains the pipe Wen Wendu of evaporimeter and the dew-point temperature of room air.

First control subelement 202 pipe Wen Wendu not higher than dew-point temperature and the current running frequency of compressor is low-limit frequency time, control compressor maintenance ongoing frequency and run the second duration, trigger the first data acquisition subelement 201 afterwards and perform the operation obtaining the pipe Wen Wendu of evaporimeter and the dew-point temperature of room air; First control subelement 202 pipe Wen Wendu not higher than dew-point temperature and the current running frequency of compressor is not low-limit frequency time, control compressor reduce frequency and run the 3rd duration, trigger the first data acquisition subelement 201 afterwards and perform the operation obtaining the pipe Wen Wendu of evaporimeter and the dew-point temperature of room air.

Second controls subelement 202 when pipe Wen Wendu is higher than dew-point temperature, controls compressor maintenance ongoing frequency and runs the second duration, trigger the first data acquisition subelement 201 afterwards and perform the operation obtaining the pipe Wen Wendu of evaporimeter and the dew-point temperature of room air.

Second control unit 300, for when determining to need to carry out dehumidification treatments, carries out dehumidification operation.Second control unit 300 comprises the second data acquisition subelement 301, the 3rd and controls subelement 302 and the 4th control subelement 303.Wherein:

Second data acquisition subelement 301, for when determining to need to carry out dehumidification treatments, obtains the pipe Wen Wendu of evaporimeter and the dew-point temperature of room air.

3rd control subelement 302 pipe Wen Wendu higher than dew-point temperature and the current running frequency of compressor is highest frequency time, control compressor and maintain ongoing frequency operation the 4th duration, trigger judging unit 100 execution afterwards and judge that current indoor environment is the need of the operation carrying out dehumidification treatments; 3rd control subelement 302 pipe Wen Wendu higher than dew-point temperature and the current running frequency of compressor is not highest frequency time, control compressor improve frequency and run the 5th duration, if control compressor to carry high-frequency number of times more than first number, then trigger the second data acquisition subelement 301 and perform the operation determining the pipe Wen Wendu of evaporimeter and the dew-point temperature of room air, otherwise, trigger judging unit 100 execution and judge that current indoor environment is the need of the operation carrying out dehumidification treatments.

4th controls subelement 303 for when pipe Wen Wendu is not higher than dew-point temperature, and control compressor and maintain ongoing frequency operation the 4th duration, triggering judging unit 100 performs and judges that current indoor environment is the need of the operation carrying out dehumidification treatments afterwards.

The control device of convertible frequency air-conditioner disclosed by the invention, can regulate the humidity of room air, and when not needing dehumidification operation, being reduced the dehumidifying effect of air-conditioning, reduce system energy consumption by the running frequency reducing compressor.

Certainly, judging unit 100 judges that current indoor environment is the need of carrying out dehumidification treatments, can also adopt other modes.

Such as: judging unit 100 comprises the first judgment sub-unit, this first judgment sub-unit is for judging that current indoor environment is the need of carrying out dehumidification treatments, first judgment sub-unit comprises: water capacity determination module, for determining water capacity and the target moisture content of current indoor air; First processing module, for when the water capacity of current indoor air is not more than target moisture content, determines not need to carry out dehumidification treatments; Second processing module, for when the water capacity of current indoor air is greater than target moisture content, determine relative humidity and the setting humidity of current indoor air, when relative humidity is greater than setting humidity, determine to need to carry out dehumidification treatments, when relative humidity is not more than setting humidity, determine not need to carry out dehumidification treatments.

It should be noted that, target moisture content can be the water capacity that target humidity is corresponding.In enforcement, water capacity corresponding for target humidity and water capacity corrected parameter sum can also be defined as target moisture content, water capacity corrected parameter can be 0.5g/kg, can certainly be set to other numerical value.

In enforcement, except the structure shown in Fig. 1, the first control unit 200 can also adopt other structures.See the another kind of structural representation that Fig. 7, Fig. 7 are the first control unit in the present invention.First control unit comprises: the first control unit 200 comprises the first data acquisition subelement 201, first and controls subelement 202, second control subelement 203, the 3rd data acquisition subelement 204, first judgment sub-unit 205, the 5th control subelement 206 and the 6th control subelement 207.

Wherein, the first data acquisition subelement 201, first control subelement 202 and the second function controlling subelement 203 refer to and describe above, repeat no more here.

3rd data acquisition subelement 204, for when pipe Wen Wendu is not higher than dew-point temperature, obtains detected temperatures and the outdoor condenser temperature of off-premises station environment temperature-sensitive bag.

Whether the first judgment sub-unit 205 is less than the first temperature approach for the difference between the detected temperatures of off-premises station environment temperature-sensitive bag that judges the 3rd data acquisition subelement 204 and get and outdoor condenser temperature.

When 5th control subelement 206 is more than or equal to the first temperature approach for the difference between the detected temperatures and outdoor condenser temperature of off-premises station environment temperature-sensitive bag, control direct current generator and maintain the operation of current rotating speed, after continuing the 6th duration, trigger the 3rd data acquisition subelement 204 and perform the detected temperatures of acquisition off-premises station environment temperature-sensitive bag and the operation of outdoor condenser temperature.

6th controls subelement 207 is less than the first temperature approach for the difference between the detected temperatures and outdoor condenser temperature of off-premises station environment temperature-sensitive bag, and direct current generator current rotating speed is not when being minimum speed, control direct current generator and reduce rotating speed, after continuing the 7th duration, trigger the 3rd data acquisition subelement 204 and perform the detected temperatures of acquisition off-premises station environment temperature-sensitive bag and the operation of outdoor condenser temperature; The first temperature approach is less than for the difference between the detected temperatures and outdoor condenser temperature of off-premises station environment temperature-sensitive bag, and direct current generator current rotating speed is when being minimum speed, control direct current generator and maintain the operation of current rotating speed, after continuing the 6th duration, trigger the 3rd data acquisition subelement 204 and perform the detected temperatures of acquisition off-premises station environment temperature-sensitive bag and the operation of outdoor condenser temperature.

In enforcement, except structure shown in Fig. 1, the second control unit 300 can also adopt other structures.See the another kind of structural representation that Fig. 8, Fig. 8 are the second control unit in the present invention.Second control unit comprises: the second data acquisition subelement 301, the 3rd controls subelement 302, the 4th and controls subelement 303, the 4th data acquisition subelement 304, second judgment sub-unit 305, the 7th control subelement 306 and the 8th control subelement 307.

Wherein, the second data acquisition subelement 301, the 3rd control subelement 302 and the 4th function controlling subelement 303 refer to and describe above, repeat no more here.

4th data acquisition subelement 304, for when pipe Wen Wendu is higher than dew-point temperature, obtains detected temperatures and the outdoor condenser temperature of off-premises station environment temperature-sensitive bag.

Whether the second judgment sub-unit 305 is less than or equal to the second temperature approach for the difference between the detected temperatures of off-premises station environment temperature-sensitive bag that judges the 4th data acquisition subelement 304 and get and outdoor condenser temperature.

When 7th control subelement 306 is less than or equal to the second temperature approach for the difference between the detected temperatures and outdoor condenser temperature of off-premises station environment temperature-sensitive bag, control direct current generator and maintain current rotation speed operation, after continuing the 8th duration, trigger judging unit 100 execution and judge that current indoor environment is the need of the operation carrying out dehumidification treatments.

8th controls subelement 307 is greater than the second temperature approach for the difference between the detected temperatures and outdoor condenser temperature of off-premises station environment temperature-sensitive bag, and direct current generator current rotating speed is when being maximum speed, control direct current generator and maintain the operation of current rotating speed, after continuing the 8th duration, trigger judging unit 100 execution and judge that current indoor environment is the need of the operation carrying out dehumidification treatments; The second temperature approach is greater than for the difference between the detected temperatures and outdoor condenser temperature of off-premises station environment temperature-sensitive bag, and direct current generator current rotating speed is not when being maximum speed, control direct current generator and improve rotating speed, after continuing the 9th duration, if control direct current generator to carry high-revolving number of times more than second number, then trigger the second data acquisition subelement 301 and perform the operation obtaining the pipe Wen Wendu of evaporimeter and the dew-point temperature of room air, otherwise, trigger judging unit 100 execution and judge that current indoor environment is the need of the operation carrying out dehumidification treatments.

The invention also discloses a kind of convertible frequency air-conditioner, comprise indoor set and off-premises station, the motor wherein in off-premises station is direct current generator, and convertible frequency air-conditioner disclosed by the invention also comprises above-mentioned any one control device disclosed of the present invention.Convertible frequency air-conditioner disclosed by the invention can regulate the humidity of room air, and when not needing dehumidification operation, reduces dehumidifying effect by the running frequency reducing compressor, thus reduces system energy consumption.

Finally, also it should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.

In this description, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.For device disclosed in embodiment, because it corresponds to the method disclosed in Example, so description is fairly simple, relevant part illustrates see method part.

Professional can also recognize further, in conjunction with unit and the algorithm steps of each example of embodiment disclosed herein description, can realize with electronic hardware, computer software or the combination of the two, in order to the interchangeability of hardware and software is clearly described, generally describe composition and the step of each example in the above description according to function.These functions perform with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel can use distinct methods to realize described function to each specifically should being used for, but this realization should not thought and exceeds scope of the present invention.

The software module that the method described in conjunction with embodiment disclosed herein or the step of algorithm can directly use hardware, processor to perform, or the combination of the two is implemented.Software module can be placed in the storage medium of other form any known in random access memory (RAM), internal memory, read-only storage (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field.

To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.

Claims

1. a control method for convertible frequency air-conditioner, is characterized in that, comprising:

2. control method according to claim 1, is characterized in that, described judgement current indoor environment, the need of carrying out dehumidification treatments, comprising:

Determine water capacity and the target moisture content of current indoor air;

3. control method according to claim 1 and 2, the off-premises station motor of convertible frequency air-conditioner is direct current generator, it is characterized in that, performs in the process of independent refrigerating operation, when described pipe Wen Wendu is not higher than described dew-point temperature, also comprises:

4. control method according to claim 1 and 2, the off-premises station motor of convertible frequency air-conditioner is direct current generator, it is characterized in that, when determining to need to carry out dehumidification operation, when described pipe Wen Wendu is higher than described dew-point temperature, also comprises:

5. control method according to claim 1, is characterized in that, the described first pre-conditioned difference between indoor environment temperature and design temperature is less than the 3rd temperature difference;

6. a control device for convertible frequency air-conditioner, is characterized in that, comprising:

7. control device according to claim 6, is characterized in that, described judging unit comprises the first judgment sub-unit, and described first judgment sub-unit is for judging that current indoor environment is the need of carrying out dehumidification treatments, and described first judgment sub-unit comprises:

8. the control device according to claim 6 or 7, the off-premises station motor of convertible frequency air-conditioner is direct current generator, it is characterized in that, described first control unit also comprises:

9. the control device according to claim 6 or 7, the off-premises station motor of convertible frequency air-conditioner is direct current generator, it is characterized in that, described second control unit also comprises:

10. a convertible frequency air-conditioner, comprises indoor set and off-premises station, and the motor in described off-premises station is direct current generator, it is characterized in that, also comprises the control device according to any one of claim 6 to 9.