CN104697109A - Refrigeration control method, control device and variable frequency air conditioner - Google Patents

Refrigeration control method, control device and variable frequency air conditioner Download PDF

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Publication number
CN104697109A
CN104697109A CN201410801211.5A CN201410801211A CN104697109A CN 104697109 A CN104697109 A CN 104697109A CN 201410801211 A CN201410801211 A CN 201410801211A CN 104697109 A CN104697109 A CN 104697109A
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China
Prior art keywords
temperature
control
pid
indoor
frequency
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CN201410801211.5A
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Chinese (zh)
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CN104697109B (en
Inventor
程永甫
宋世芳
刘聚科
徐贝贝
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Qingdao Haier Air Conditioner Gen Corp Ltd
Haier Group Corp
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Qingdao Haier Air Conditioner Gen Corp Ltd
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    • 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
    • F24F11/62Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63Electronic processing
    • F24F11/64Electronic processing using pre-stored data

Abstract

The invention discloses a refrigeration control method, a control device and a variable frequency air conditioner. The method comprises steps as follows: detecting the indoor temperature in the refrigeration operation process, calculating the indoor temperature difference, and performing PID (proportion integration differentiation) operation on room temperature according to the indoor temperature difference to obtain a first target frequency; comparing the indoor temperature with a set comfortable temperature; controlling a compressor according to the first target frequency if the indoor temperature is not lower than the comfortable temperature; if the indoor temperature is lower than the comfortable temperature, detecting the coil temperature of an evaporator of the variable frequency air conditioner, calculating the temperature difference between the coil temperature and a set coil target temperature to obtain a coil temperature difference, and performing PID operation on the coil temperature according to the coil temperature difference to obtain a second target frequency; controlling the compressor according to the smaller one of the first target frequency and the second target frequency. With the adoption of the refrigeration control method, the control device and the variable frequency air conditioner, the problem about refrigeration comfortlessness caused by cold air blown by an existing variable frequency air conditioner can be solved.

Description

Refrigeration control method, control device and convertible frequency air-conditioner
Technical field
The invention belongs to air-conditioning technique field, specifically, relate to a kind of refrigeration control method, control device and convertible frequency air-conditioner.
Background technology
Hot summer, a lot of people be unable to do without air-conditioning the whole day and night.But it is a lot of to the harm of human body to blow air-conditioning for a long time, easy air conditioner disease.
Although existing convertible frequency air-conditioner can control compressor operating frequency, it controls, according to the indoor objects temperature being only indoor temperature and setting, can not change air conditioning exhausting temperature.And for reaching fast-refrigerating, existing air-conditioned leaving air temp will far below design temperature, air conditioning exhausting temperature is low, and the wind of blowout is cold wind.Cold wind blows on the person, feels very uncomfortable, and flu of easily catching a cold.Blast-cold air-blowing flu of catching a cold all is afraid of more by a lot of family, takes air-ventilating garments daytime and blows air-conditioning, opens air-conditioning at night, while be covered with thick cotton-wadded quilt, think and this prevents air conditioner disease when sleep.But cold air can enter human body from respiratory tract, the time of blowing has been grown and has still had that mouth and nose are dry, the cold symptoms such as to have sore throat, and fundamentally can not solve the uncomfortable problem of refrigeration.
Summary of the invention
The object of this invention is to provide a kind of refrigeration control method and control device, cause to solve existing convertible frequency air-conditioner blowing cold air uncomfortable problem of freezing.
For achieving the above object, refrigeration control method of the present invention and control device adopt following technical proposals to be achieved:
A kind of refrigerating of convertible frequency air conditioner control method, described method comprises:
In refrigerating of convertible frequency air conditioner running, detect indoor temperature, the temperature difference between the indoor objects temperature calculating described indoor temperature and setting, obtains the indoor temperature difference, carries out room temperature PID computing according to the described indoor temperature difference, obtains first object frequency;
And the comfort temperature of described indoor temperature and setting is made comparisons;
If described indoor temperature is not less than described comfort temperature, performs following room temperature PID and control:
The compressor of convertible frequency air-conditioner according to described first object FREQUENCY CONTROL;
If described indoor temperature is less than described comfort temperature, performs following dual PID and control:
Detect the coil temperature of described convertible frequency air-conditioner evaporimeter, the temperature difference between the coil pipe target temperature calculating described coil temperature and setting, obtain the coil pipe temperature difference, carry out coiling warm PID arithmetic according to the described coil pipe temperature difference, obtain the second target frequency; Described compressor is controlled according to the smaller value in described first object frequency and described second target frequency.
A kind of refrigerating of convertible frequency air conditioner control device, described device comprises:
Indoor temperature detecting unit, for detecting indoor temperature;
Coil temperature detecting unit, for detecting the coil temperature of described convertible frequency air-conditioner evaporimeter;
Room temperature PID arithmetic element, for calculate described indoor temperature and setting indoor objects temperature between the temperature difference, obtain the indoor temperature difference, carry out room temperature PID computing according to the described indoor temperature difference, obtain and export first object frequency;
Coil warm PID arithmetic unit, for calculate described coil temperature and setting coil pipe target temperature between the temperature difference, obtain the coil pipe temperature difference, carry out coiling warm PID arithmetic according to the described coil pipe temperature difference, obtain and export the second target frequency;
Control model selection unit, for the comfort temperature of more described indoor temperature and setting, and exports comparative result and selects signal as control model;
Room temperature PID control unit, the comparative result for exporting at described control model selection unit is described indoor temperature when being not less than described comfort temperature, the compressor of convertible frequency air-conditioner according to described first object FREQUENCY CONTROL;
Dual PID control unit, the comparative result for exporting at described control model selection unit is described indoor temperature when being less than described comfort temperature, controls described compressor according to the smaller value in described first object frequency and described second target frequency.
Present invention also offers a kind of convertible frequency air-conditioner with above-mentioned refrigeration control device.
Compared with prior art, advantage of the present invention and good effect are:
The present invention is by setting comfort temperature, according to the size of indoor temperature and comfort temperature, select to adopt room temperature PID to control or adopt the dish temperature PID based on evaporator coil temperature to control, can when room temperature height in time, fast room be lowered the temperature, reach refrigeration object, coil temperature can be stabilized in coil pipe target temperature again, make air conditioning exhausting temperature pleasant, reach cool and not cold comfortable cooling effect.
After reading the specific embodiment of the present invention by reference to the accompanying drawings, the other features and advantages of the invention will become clearly.
Accompanying drawing explanation
Fig. 1 is the flow chart of a refrigerating of convertible frequency air conditioner control method of the present invention embodiment;
Fig. 2 is the structured flowchart of a refrigerating of convertible frequency air conditioner control device of the present invention embodiment.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, technical scheme of the present invention is described in further detail.
Refer to Fig. 1, this figure is depicted as the flow chart of refrigerating of convertible frequency air conditioner control method of the present invention first embodiment.
As shown in Figure 1, the detailed process of this embodiment refrigeration control method is as follows:
Step 11: refrigerating operaton, detects indoor temperature, carries out room temperature PID computing according to the indoor temperature difference, obtains first object frequency.
Specifically, when VFC is started shooting and performed refrigerating operaton, detect the indoor temperature in room residing for convertible frequency air-conditioner.The detection of this indoor temperature adopts prior art to realize.Such as, by being arranged on air-conditioning air inlet or detecting EAT, as indoor temperature near the temperature sensor of air-conditioning air inlet.
Then, the temperature difference between indoor temperature and the indoor objects temperature of setting is calculated, using this temperature difference as the indoor temperature difference.Wherein, indoor objects temperature refers to the target temperature that the hope indoor that user sets reach.
Subsequently, carry out room temperature PID computing according to the indoor temperature difference, obtain the target frequency that compressor is controlled, and this target frequency is defined as first object frequency.Wherein, carry out room temperature PID computing according to the indoor temperature difference, obtain and can adopt prior art to realize to the concrete grammar of the target frequency that compressor controls, be not elaborated at this and limit.
Step 12: judge whether indoor temperature is less than comfort temperature.If so, the dual PID performing step 14 controls; Otherwise the room temperature PID performing step 13 controls.
This step 12 can be carried out with step 11 simultaneously, is divided into two steps to be only control procedure in order to clearly state this embodiment at this.After step 11 detects indoor temperature, the comfort temperature of indoor temperature and setting is made comparisons, and judge whether indoor temperature is less than comfort temperature.Wherein, comfort temperature can be a default setting temperature of convertible frequency air-conditioner when dispatching from the factory, and also can be selected voluntarily by user and arrange design temperature.If by user's sets itself, convertible frequency air-conditioner can provide a reference temperature value, for reference.Such as, advise this comfort temperature to be set as 27 DEG C.
Step 13: if indoor temperature is not less than comfort temperature, performs room temperature PID and controls, according to first object FREQUENCY CONTROL compressor.
If step 3 judges that indoor temperature is not less than comfort temperature, show that now indoor temperature is higher, then perform room temperature PID and control, according to first object FREQUENCY CONTROL compressor, make indoor temperature fast cooling to indoor objects temperature.
Step 14: if indoor temperature is less than comfort temperature, performs dual PID and controls.
If step 12 judges that indoor temperature is less than comfort temperature, cause body sense uncomfortable for avoiding the too fast decline of temperature, perform dual PID to control, so that adjustment compressor operating frequency in time, make evaporator coil temperature can be stabilized to coil pipe target temperature, to adjust air conditioning exhausting temperature, reach cool and not cold comfortable air-out effect.The process that concrete dual PID controls see step 15 below to the description of step 16.
Step 15: the coil temperature detecting evaporimeter, carries out coiling warm PID arithmetic according to the coil pipe temperature difference, obtains the second target frequency.
The detection of the coil temperature of evaporimeter detects by set temperature sensor on evaporator coil.After detecting coil temperature, calculate the temperature difference between coil temperature and the coil pipe target temperature of setting, using this temperature difference as the coil pipe temperature difference.Wherein, coil pipe target temperature can be a default setting temperature of convertible frequency air-conditioner when dispatching from the factory, and can certainly be selected voluntarily by user and arrange design temperature.If by user's sets itself, because user is not very clear and definite for the concept of coil temperature and the performance indications of representative thereof, preferably provide a reference temperature value by convertible frequency air-conditioner, for reference selected.Such as, advise this coil pipe target temperature to be set as 14 DEG C.Then, carry out coiling warm PID arithmetic according to the coil pipe temperature difference, obtain the target frequency that compressor is controlled, and this target frequency is defined as the second target frequency.Coil warm PID arithmetic and obtain the method that can obtain compressor target frequency to the method for the target frequency that compressor controls with reference to room temperature PID computing of the prior art.Wherein, the original frequency coiling warm PID arithmetic can be the original frequency of a setting.Preferably, the original frequency coiling warm PID arithmetic is that step 12 judges that indoor temperature is less than comfort temperature, performs the current operation frequency of compressor when dual PID controls.And this current operation frequency is at least a running frequency after compressor operating a period of time (as 3min).
Step 16: the smaller value in the second target frequency that the first object frequency calculated according to step 11 and step 15 calculate controls compressor.
When indoor temperature is less than comfort temperature, warm PID arithmetic is coiled in coil pipe target temperature execution according to coil temperature and setting, and control compressor operating according to the smaller value in the second target frequency of the first object frequency level dish temperature PID arithmetic output of room temperature PID computing output, while refrigeration cool-down, check and regulate coil temperature, coil temperature can be approached to coil pipe target temperature.
Adopt said process to carry out refrigeration control to convertible frequency air-conditioner, when indoor temperature is higher, adopts room temperature PID to control compressor operating, make indoor temperature fast cooling and approach indoor objects temperature.When indoor temperature is less than comfort temperature, adopt room temperature PID to control to control with the dual PID that controls of the warm PID of dish: just to enter coil warm PID control time, coil warm PID to control to play a major role, while cooling, preferentially make coil temperature rise to approach coil pipe target temperature; And when coil temperature is close to coil pipe target temperature, room temperature PID plays a major role, make indoor temperature be stabilized in indoor objects temperature, avoid causing because of room temperature overshoot air-conditioning to shut down the generation of phenomenon.Thus, in whole refrigeration control process, the basis approaching indoor objects temperature making indoor temperature making coil temperature approach coil pipe design temperature, both having met room temperature and having regulated, having realized again the comfortableness of air conditioning exhausting, reach cool and not cold refrigeration.
And, in the process performing dual PID control, still constantly detect indoor temperature in real time, and compare the size of indoor temperature and comfort temperature.Once indoor temperature is not less than comfort temperature, then exits dual PID control procedure, be transferred to room temperature PID control procedure, to make indoor temperature temperature in the indoor objects temperature of setting.
As preferred embodiment, when indoor temperature is not less than comfort temperature and the difference of indoor temperature and comfort temperature is greater than the difference of setting, then exit dual PID control procedure, be transferred to room temperature PID control procedure.By the difference that choose reasonable sets, such as, be set as 1 DEG C, can guarantee that coil temperature is not less than coil pipe target temperature, ensure out cool and not cold comfortableness.
And, run in control procedure, if the non-wind speed setting of user at the air conditioner refrigerating of this embodiment, then control air-conditioning draught fan to run according to highest wind velocity, because under same refrigerating capacity, the leaving air temp of high wind speed is higher than the leaving air temp of low wind speed, guarantees that leaving air temp can not be too low further.And if the wind speed that user sets detected, then control blower fan according to setting wind speed run.
Refer to Fig. 2, this figure is depicted as the structured flowchart of a refrigerating of convertible frequency air conditioner control device of the present invention embodiment.
As shown in Figure 2, the construction unit that comprises of the refrigeration control device of this embodiment and function as follows:
Indoor temperature detecting unit 21, for detecting indoor temperature;
Room temperature PID arithmetic element 22, for calculating the temperature difference between indoor temperature and the indoor objects temperature of setting that indoor temperature detecting unit 21 detects, obtaining the indoor temperature difference, and carrying out room temperature PID computing according to the indoor temperature difference, obtain and export first object frequency;
Coil temperature detecting unit 23, for detecting the coil temperature of convertible frequency air-conditioner evaporimeter;
Coil warm PID arithmetic unit 24, for calculate coil temperature and setting coil pipe target temperature between the temperature difference, obtain the coil pipe temperature difference, carry out coiling warm PID arithmetic according to the coil pipe temperature difference, obtain and export the second target frequency;
Control model selection unit 25, for comparing the size of the comfort temperature of indoor temperature that indoor temperature detecting unit 21 detects and setting, and export comparative result and select signal to room temperature PID control unit 26 and/or dual PID control unit 27 as control model;
Room temperature PID control unit 26, the comparative result for exporting at control model selection unit 25 is indoor temperature when being not less than comfort temperature, according to the compressor 28 of the first object FREQUENCY CONTROL convertible frequency air-conditioner that room temperature PID arithmetic element 22 exports;
Dual PID control unit 27, comparative result for exporting at control model selection unit 25 is indoor temperature when being less than comfort temperature, and the smaller value in the second target frequency that the first object frequency exported according to room temperature PID arithmetic element 22 and the warm PID arithmetic unit 24 of dish export controls compressor 28.
In addition, refrigeration control device can also comprise air-blower control unit (not shown), and in refrigerating of convertible frequency air conditioner running, if the wind speed that user sets detected, then the blower fan controlling convertible frequency air-conditioner runs according to the wind speed of setting; Otherwise, control blower fan and run according to highest wind velocity.
The refrigeration control device of said structure can be applied in convertible frequency air-conditioner, runs corresponding software program, and according to the flow performing refrigeration control of Fig. 1, realizes air-conditioning fast cooling and go out cool and not cold comfortable cooling.
Above embodiment only in order to technical scheme of the present invention to be described, but not is limited; Although with reference to previous embodiment to invention has been detailed description, for the person of ordinary skill of the art, still can modify to the technical scheme described in previous embodiment, or equivalent replacement is carried out to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of the present invention's technical scheme required for protection.

Claims (11)

1. a refrigeration control method, is characterized in that, described method comprises:
In refrigerating of convertible frequency air conditioner running, detect indoor temperature, the temperature difference between the indoor objects temperature calculating described indoor temperature and setting, obtains the indoor temperature difference, carries out room temperature PID computing according to the described indoor temperature difference, obtains first object frequency;
And the comfort temperature of described indoor temperature and setting is made comparisons;
If described indoor temperature is not less than described comfort temperature, performs following room temperature PID and control:
The compressor of convertible frequency air-conditioner according to described first object FREQUENCY CONTROL;
If described indoor temperature is less than described comfort temperature, performs following dual PID and control:
Detect the coil temperature of described convertible frequency air-conditioner evaporimeter, the temperature difference between the coil pipe target temperature calculating described coil temperature and setting, obtain the coil pipe temperature difference, carry out coiling warm PID arithmetic according to the described coil pipe temperature difference, obtain the second target frequency; Described compressor is controlled according to the smaller value in described first object frequency and described second target frequency.
2. refrigeration control method according to claim 1, it is characterized in that, when performing described dual PID and controlling, the described indoor temperature of real-time detection, and described indoor temperature and described comfort temperature are made comparisons, when described indoor temperature is not less than described comfort temperature, exits described dual PID and control, perform described room temperature PID and control.
3. refrigeration control method according to claim 2, it is characterized in that, when performing described dual PID and controlling, the described indoor temperature of real-time detection, and described indoor temperature and described comfort temperature are made comparisons, when described indoor temperature is not less than described comfort temperature and the difference of described indoor temperature and described comfort temperature is greater than the difference of setting, exits described dual PID and control, perform described room temperature PID and control.
4. refrigeration control method according to claim 1, it is characterized in that, when performing described dual PID and controlling, obtain the current operation frequency of described compressor, using the original frequency of described current operation frequency as described dish temperature PID arithmetic, and carry out described dish temperature PID arithmetic according to the described coil pipe temperature difference.
5. refrigeration control method according to any one of claim 1 to 4, is characterized in that, in described refrigerating of convertible frequency air conditioner running, if the wind speed that user sets detected, then the blower fan controlling described convertible frequency air-conditioner runs according to the wind speed of described setting; Otherwise, control described blower fan and run according to highest wind velocity.
6. a refrigerating of convertible frequency air conditioner control device, is characterized in that, described device comprises:
Indoor temperature detecting unit, for detecting indoor temperature;
Coil temperature detecting unit, for detecting the coil temperature of described convertible frequency air-conditioner evaporimeter;
Room temperature PID arithmetic element, for calculate described indoor temperature and setting indoor objects temperature between the temperature difference, obtain the indoor temperature difference, carry out room temperature PID computing according to the described indoor temperature difference, obtain and export first object frequency;
Coil warm PID arithmetic unit, for calculate described coil temperature and setting coil pipe target temperature between the temperature difference, obtain the coil pipe temperature difference, carry out coiling warm PID arithmetic according to the described coil pipe temperature difference, obtain and export the second target frequency; Control model selection unit, for the comfort temperature of more described indoor temperature and setting, and exports comparative result and selects signal as control model;
Room temperature PID control unit, the comparative result for exporting at described control model selection unit is described indoor temperature when being not less than described comfort temperature, the compressor of convertible frequency air-conditioner according to described first object FREQUENCY CONTROL; Dual PID control unit, the comparative result for exporting at described control model selection unit is described indoor temperature when being less than described comfort temperature, controls described compressor according to the smaller value in described first object frequency and described second target frequency.
7. refrigeration control device according to claim 6, it is characterized in that, when described dual PID control unit performs dual PID control, described control model selection unit is more described indoor temperature and described comfort temperature in real time, when described indoor temperature is not less than described comfort temperature, described dual PID control unit exits control, the compressor of described room temperature PID control unit convertible frequency air-conditioner according to described first object FREQUENCY CONTROL.
8. refrigeration control device according to claim 7, it is characterized in that, when described indoor temperature is not less than described comfort temperature and the difference of described indoor temperature and described comfort temperature is greater than the difference of setting, described dual PID control unit exits control, the compressor of described room temperature PID control unit convertible frequency air-conditioner according to described first object FREQUENCY CONTROL.
9. refrigeration control device according to claim 6, it is characterized in that, described dish temperature PID arithmetic unit obtains the current operation frequency of described compressor, using the original frequency of described current operation frequency as described dish temperature PID arithmetic, and carry out described dish temperature PID arithmetic according to the described coil pipe temperature difference.
10. the refrigeration control device according to any one of claim 6 to 9, is characterized in that, described device also comprises:
Air-blower control unit, in refrigerating of convertible frequency air conditioner running, if the wind speed that user sets detected, then the blower fan controlling described convertible frequency air-conditioner runs according to the wind speed of described setting; Otherwise, control described blower fan and run according to highest wind velocity.
11. 1 kinds of convertible frequency air-conditioners, is characterized in that, described convertible frequency air-conditioner includes the refrigeration control device according to any one of the claims 6 to 10.
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Inventor after: Wang Youning

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Inventor after: Cheng Yongfu

Inventor after: Song Shifang

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